CN105241171B - Using the controlling method for refrigerator and control system of linear compressor - Google Patents

Abstract

The present invention discloses a refrigerator control method using a linear compressor and the control method. The control method includes: monitoring the ambient temperature T of the refrigerator; comparing the ambient temperature T with a preset ambient temperature threshold T0; if T is greater than T0, when the linear compressor operates within a predetermined time, the rotational speed of the refrigeration fan is controlled to be the first rotational speed; if T is less than or equal to T0, when the linear compressor operates within a predetermined time, the rotational speed of the refrigeration fan is controlled to be A second rotational speed, wherein the second rotational speed is greater than the first rotational speed. The present invention increases the rotation speed of the refrigerating fan or decreases the rotation speed of the cooling fan in the refrigerator to increase the stroke of the piston in the linear compressor, thereby preventing the refrigerator from being unable to work normally due to the protection of the linear compressor by the frequency conversion board.

Description

Refrigerator control method and control system using linear compressor

technical field

The invention relates to the technical field of refrigerators and linear compressors, in particular to a control method and a control system for a refrigerator using a linear compressor.

Background technique

The compressor is a driven fluid machine that lifts low-pressure gas into high-pressure gas, and is the heart of the refrigeration system. It inhales low-temperature and low-pressure refrigerant gas from the suction pipe, drives the piston to compress it through the operation of the motor, and discharges high-temperature and high-pressure refrigerant gas to the exhaust pipe to provide power for the refrigeration cycle, thereby realizing compression → condensation (heat release ) → Expansion → Evaporation (endothermic) refrigeration cycle.

Linear compressors are widely used in small refrigeration capacity fields such as refrigerators. They have the advantages of simple structure, less friction loss, low noise, and can easily adjust the flow rate by adjusting the voltage. It is simpler and more reliable than frequency conversion adjustment, and can realize the advantages of less oil or no oil lubricating oil. . For example, the Chinese patent of CN 203394701U discloses a linear compressor. As shown in FIG. 1, it includes an exhaust mechanism 1 and two parts of a compressor assembly. The compressor assembly includes a cylinder 16, a piston assembly, a moving magnet linear oscillating motor, Resonant spring 8, compressor housing, piston assembly includes piston 2, piston rod 3, rod end plate 10 and suction valve 15; exhaust mechanism 1 includes exhaust valve plate 17, exhaust valve plate 18 and so on.

The working process of the linear compressor is electronically controlled. When the output power is small, the stroke of the piston 2 of the linear compressor is small, and the collision between the piston 2 and the exhaust valve plate 18 is very likely to cause the compressor to fail. For this reason, when designing the frequency conversion board of the linear compressor, a protection program will be set to prevent the mechanical parts of the compressor from being damaged. For example, the frequency conversion board of the linear compressor will start the protection program to stop the linear compressor from working.

When the refrigerator works at a low temperature, the heat load of the refrigerator is low, and the cooling capacity required by the compartment will be relatively low. At this time, the linear compressor will run at a low output power, resulting in a small stroke of the piston of the linear compressor. Hidden danger of hitting the exhaust valve plate.

Contents of the invention

Aiming at the deficiencies of the prior art, the technical problem solved by the present invention is to provide a refrigerator control method and control system using a linear compressor.

In order to solve the problems of the technologies described above, the technical solution of the present invention is achieved in the following way:

A control method for a refrigerator using a linear compressor, the control method comprising:

Monitor the ambient temperature T of the refrigerator;

Comparing the ambient temperature T with a preset ambient temperature threshold T0;

If T is greater than T0, control the speed of the refrigeration fan to the first speed when the linear compressor operates within a predetermined time; if T is less than or equal to T0, control the speed of the refrigeration fan when the linear compressor operates within a predetermined time The rotational speed is a second rotational speed, wherein the second rotational speed is greater than the first rotational speed.

As a further improvement of the present invention, the method also includes:

monitoring the running state of the linear compressor;

When the running state of the linear compressor is abnormal, a predetermined amplitude is added to the current rotational speed of the refrigeration fan;

When the running state of the linear compressor is normal, the value of the second rotating speed is updated with the current rotating speed of the refrigeration fan.

As a further improvement of the present invention, the method also includes:

monitoring the running state of the linear compressor;

When the running state of the linear compressor is abnormal, a predetermined amplitude is added to the current rotational speed of the refrigeration fan;

When the running state of the linear compressor is normal, set the current rotation speed of the refrigeration fan as a third rotation speed, associate the third rotation speed with the ambient temperature T, and control the rotation speed of the refrigeration fan when the ambient temperature is less than or equal to T for the third speed.

As a further improvement of the present invention, monitoring the running state of the linear compressor specifically includes:

judging whether the linear compressor stops unexpectedly when running within a predetermined time;

If yes, it is considered that the running state of the linear compressor is abnormal.

Correspondingly, a refrigerator control system using a linear compressor, the control system includes a temperature monitoring device and a main control board connected to the temperature monitoring device, wherein,

The temperature monitoring device is used to monitor the ambient temperature T of the refrigerator;

The main control board is used to compare the ambient temperature T with a preset ambient temperature threshold T0;

The main control board is also used for the rotation speed of the refrigeration fan. If T is greater than T0, when the linear compressor runs within a predetermined time, the rotation speed of the refrigeration fan is controlled to be the first rotation speed. If T is less than or equal to T0, when the When the linear compressor operates within a predetermined time, the rotation speed of the refrigeration fan is controlled to be a second rotation speed, wherein the second rotation speed is greater than the first rotation speed.

As a further improvement of the present invention, the main control board is also used to monitor the running state of the linear compressor. When the running state of the linear compressor is abnormal, a predetermined amplitude is added to the current rotation speed of the refrigeration fan. When the linear compressor After the compressor is running normally, the value of the second rotating speed is updated with the current rotating speed of the refrigeration fan.

As a further improvement of the present invention, the main control board is also used to monitor the running state of the linear compressor. When the running state of the linear compressor is abnormal, a predetermined amplitude is added to the current rotation speed of the refrigeration fan. When the linear compressor After the compressor is running normally, set the current rotation speed of the refrigeration fan to the third rotation speed, associate the third rotation speed with the ambient temperature T, and control the rotation speed of the refrigeration fan to the third rotation speed when the ambient temperature is less than or equal to T .

As a further improvement of the present invention, the main control board is also used to determine whether the linear compressor stops unexpectedly when running within a predetermined time, and if so, consider the linear compressor to be in an abnormal operating state.

Another technical scheme of the present invention is realized like this:

A control method for a refrigerator using a linear compressor, the control method comprising:

Monitor the ambient temperature T of the refrigerator;

Comparing the ambient temperature T with a preset ambient temperature threshold T0;

If T is greater than T0, control the speed of the cooling fan to the fourth speed when the linear compressor runs within a predetermined time; if T is less than or equal to T0, control the speed of the cooling fan when the linear compressor runs within a predetermined time The rotation speed is a fifth rotation speed, wherein the fifth rotation speed is smaller than the fourth rotation speed.

As a further improvement of the present invention, the method also includes:

monitoring the running state of the linear compressor;

When the running state of the linear compressor is abnormal, reduce the predetermined amplitude at the current speed of the cooling fan;

When the running state of the linear compressor is normal, the value of the fifth rotating speed is updated with the current rotating speed of the cooling fan.

As a further improvement of the present invention, the method also includes:

monitoring the running state of the linear compressor;

When the running state of the linear compressor is abnormal, reduce the predetermined amplitude at the current speed of the cooling fan;

When the running state of the linear compressor is normal, set the current speed of the cooling fan to the sixth speed, associate the sixth speed with the ambient temperature T, and control the speed of the cooling fan when the ambient temperature is less than or equal to T for the sixth speed.

As a further improvement of the present invention, monitoring the running state of the linear compressor specifically includes:

judging whether the linear compressor stops unexpectedly when running within a predetermined time;

If yes, it is considered that the running state of the linear compressor is abnormal.

Correspondingly, a refrigerator control system using a linear compressor, the control system includes a temperature monitoring device and a main control board connected to the temperature monitoring device, wherein,

The temperature monitoring device is used to monitor the ambient temperature T of the refrigerator;

The main control board is used to compare the ambient temperature T with a preset ambient temperature threshold T0;

The main control board is also used to control the speed of the cooling fan. If T is greater than T0, when the linear compressor runs within a predetermined time, the speed of the cooling fan is controlled to be the fourth speed. If T is less than or equal to T0, when the When the linear compressor runs within a predetermined time, the rotation speed of the cooling fan is controlled to be a fifth rotation speed, wherein the fifth rotation speed is lower than the fourth rotation speed.

As a further improvement of the present invention, the main control board is also used to monitor the running state of the linear compressor, and when the running state of the linear compressor is abnormal, reduce the predetermined amplitude on the current speed of the cooling fan, and when the After the linear compressor is running normally, the value of the fifth rotating speed is updated with the current rotating speed of the cooling fan.

As a further improvement of the present invention, the main control board is also used to monitor the running state of the linear compressor, and when the running state of the linear compressor is abnormal, reduce the predetermined amplitude on the current speed of the cooling fan, and when the After the linear compressor is running normally, set the current speed of the cooling fan to the sixth speed, associate the sixth speed with the ambient temperature T, and when the ambient temperature is less than or equal to T, control the speed of the cooling fan to the sixth Rotating speed.

As a further improvement of the present invention, the main control board is also used to determine whether the linear compressor stops unexpectedly when running within a predetermined time, and if so, consider the linear compressor to be in an abnormal operating state.

The beneficial effects of the present invention are:

The present invention increases the rotation speed of the refrigerating fan or decreases the rotation speed of the cooling fan in the refrigerator to increase the stroke of the piston in the linear compressor, thereby preventing the refrigerator from being unable to work normally due to the protection of the linear compressor by the frequency conversion board.

Description of drawings

Fig. 1 is a schematic structural diagram of a linear compressor in the prior art.

Fig. 2 is a flowchart of a refrigerator control method in the first embodiment of the present invention.

Fig. 3 is a schematic block diagram of the refrigerator control system in the first embodiment of the present invention.

Fig. 4 is a flowchart of a refrigerator control method in a second embodiment of the present invention.

Fig. 5 is a flowchart of a refrigerator control method in a third embodiment of the present invention.

Fig. 6 is a flowchart of a refrigerator control method in a fourth embodiment of the present invention.

Fig. 7 is a flowchart of a refrigerator control method in a fifth embodiment of the present invention.

Fig. 8 is a flowchart of a refrigerator control method in the sixth embodiment of the present invention.

detailed description

In order to make the object, technical solution and advantages of the present invention clearer, the specific implementation manners of the present invention will be described in detail below in conjunction with the accompanying drawings. Examples of these preferred embodiments are illustrated in the accompanying drawings. The embodiments of the invention shown in and described with reference to the drawings are merely exemplary, and the invention is not limited to these embodiments.

Here, it should also be noted that, in order to avoid obscuring the present invention due to unnecessary details, only the structures and/or processing steps closely related to the solution of the present invention are shown in the drawings, and the steps related to the present invention are omitted. Invent other details that don't really matter.

Additionally, it should be noted that the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article or apparatus comprising a set of elements includes not only those elements, but also Other elements not expressly listed, or inherent to the process, method, article, or apparatus are also included.

As shown in Fig. 2, the refrigerator control method using a linear compressor in the first embodiment of the present invention is introduced. The refrigerator in this embodiment is an air-cooled refrigerator, and it is provided with a cooling chamber for heat exchange between the refrigerator compartment and the freezer compartment. For a refrigeration fan, the control method includes:

Monitor the ambient temperature T of the refrigerator;

Comparing the ambient temperature T with a preset ambient temperature threshold T0;

If T is greater than T0, control the speed of the refrigeration fan to be the first speed when the linear compressor runs within a predetermined time; if T is less than or equal to T0, control the speed of the refrigeration fan to be the second speed when the linear compressor runs within a predetermined time Rotation speed, wherein, the second rotation speed is greater than the first rotation speed.

Correspondingly, as shown in FIG. 3 , this embodiment also discloses a refrigerator control system using a linear compressor, which includes a temperature detection device 100 and a main control board 200 connected to the temperature monitoring device, wherein:

The temperature monitoring device 100 is used to monitor the ambient temperature T of the refrigerator;

The main control board 200 is used to compare the ambient temperature T with the preset ambient temperature threshold T0;

The main control board 200 is also used to control the speed of the refrigeration fan. If T is greater than T0, the speed of the refrigeration fan is controlled to be the first speed when the linear compressor runs within a predetermined time. If T is less than or equal to T0, when the linear compressor is running When running within a predetermined time, the rotation speed of the refrigeration fan is controlled to be a second rotation speed, wherein the second rotation speed is greater than the first rotation speed.

Preferably, the ambient temperature T in this embodiment is obtained by a temperature sensor, which is installed on the refrigerator box. Of course, it can also be obtained by other temperature detection devices besides the temperature sensor, such as a thermometer.

The present invention belongs to a method for controlling refrigerators at low temperatures, and the preset ambient temperature threshold T0 is used to define the threshold of "low temperature" in the present invention. If the preset ambient temperature threshold T0 can be set to 10°C, then the ambient temperature T≤ The case of 10°C belongs to the category of low temperature. Of course, 10°C is only a preferred ambient temperature threshold in the present invention. In other embodiments, it can also be set to other temperature values, such as 5°C, 0°C, etc. In this preset environment When the temperature threshold T0 is set to other temperatures, the definition of the corresponding "low temperature" is different.

Generally, when the refrigerator works at a low temperature (the ambient temperature is less than or equal to the preset ambient temperature threshold), the heat load of the refrigerator is low, and the cooling capacity required by the compartment will be relatively low. At this time, the linear compressor will use a lower output power Running, the stroke of the piston of the linear compressor is small, and the piston may hit the exhaust valve plate, causing damage to the mechanical parts. The frequency conversion protection program of the existing linear compressor frequency conversion board is generally set, and the frequency conversion protection is turned on when the piston hits the exhaust valve plate, so that the refrigerator stops working. In order to prevent the linear compressor from being protected by the frequency conversion board, when the refrigerator is working at low temperature, it is necessary to forcibly change the operating conditions of the refrigerator.

In this embodiment, if T is greater than T0, the rotational speed of the refrigeration fan is controlled to be the first rotational speed, and if T is less than or equal to T0, the rotational speed of the refrigeration fan is controlled to be the second rotational speed, wherein the second rotational speed is greater than the first rotational speed, with Speed up the heat exchange between the refrigerating chamber and the freezing chamber of the refrigerator, so that the linear compressor needs to provide more cooling capacity when running within a predetermined time. The cooling capacity of the linear compressor is related to the stroke of the internal piston. The larger the stroke of the piston, the The more work the piston does per unit time, the more cooling capacity can be increased. Therefore, increasing the speed of the refrigeration fan can increase the stroke of the piston in the linear compressor.

When the ambient temperature T is lower than the preset ambient temperature threshold T0, the heat load of the refrigerator is relatively low, and the cooling capacity required by the compartment will be relatively low. In the case of rated cooling capacity, if the refrigeration circuit still performs refrigeration according to normal conditions, the piston stroke of the linear compressor will decrease. The refrigerator in this embodiment is an air-cooled single-system refrigerator. By increasing the rotation speed of the refrigeration fan used for heat exchange between the refrigerating chamber and the freezing chamber, when the linear compressor runs within a predetermined time, the number of pistons in the linear compressor increases. The stroke avoids the impact between the piston and the exhaust valve plate, the frequency conversion board will not start the frequency conversion protection program, and the refrigerator can operate normally.

In a specific embodiment of the present invention, the preset ambient temperature threshold T0 is 10°C. When the ambient temperature T is higher than 10°C, when the linear compressor is running, the speed of the refrigeration fan is the first speed of 2000r/min. When it is detected that the ambient temperature T is less than or equal to T0, for example, the ambient temperature is 0°C, when the linear compressor is running, the rotation speed of the refrigeration fan is controlled to be the second rotation speed of 2200r/min. In this way, the heat exchange between the refrigerator compartment and the freezer compartment can be accelerated, that is, the cooling capacity required by the refrigerator per unit time is increased, and the stroke of the piston in the linear compressor will increase.

The following describes the refrigerator control method using a linear compressor in the second embodiment of the present invention. The refrigerator in this embodiment is an air-cooled refrigerator, which is provided with a refrigeration fan for heat exchange between the refrigerator compartment and the freezer compartment. Methods include:

Monitor the ambient temperature T of the refrigerator;

Comparing the ambient temperature T with a preset ambient temperature threshold T0;

If T is greater than T0, control the speed of the refrigeration fan to be the first speed when the linear compressor runs within a predetermined time; if T is less than or equal to T0, control the speed of the refrigeration fan to be the second speed when the linear compressor runs within a predetermined time a rotational speed, wherein the second rotational speed is greater than the first rotational speed;

The steps above are the same as those in the first embodiment. Further, as shown in FIG. 4, this embodiment also includes:

Monitor the running status of the linear compressor;

When the running state of the linear compressor is abnormal, increase the predetermined amplitude on the current speed of the refrigeration fan;

When the running state of the linear compressor is normal, the value of the second rotating speed is updated with the current rotating speed of the refrigeration fan.

Monitoring the running status of the linear compressor specifically includes:

Judging whether the linear compressor stops unexpectedly when running within the predetermined time;

If yes, it is considered that the running state of the linear compressor is abnormal.

Correspondingly, this embodiment also discloses a refrigerator control system using a linear compressor, which includes a temperature detection device and a main control board connected to the temperature monitoring device, wherein:

The temperature monitoring device is used to monitor the ambient temperature T of the refrigerator;

The main control board is used to compare the ambient temperature T with the preset ambient temperature threshold T0;

The main control board is also used to control the rotation speed of the refrigeration fan. If T is greater than T0, the rotation speed of the refrigeration fan is controlled to be the first rotation speed when the linear compressor runs within a predetermined time. If T is less than or equal to T0, when the linear Control the rotation speed of the refrigeration fan to be the second rotation speed when running within the time limit, wherein the second rotation speed is greater than the first rotation speed;

The main control board is also used to monitor the running state of the linear compressor. When the running state of the linear compressor is abnormal, the predetermined amplitude is added to the current speed of the refrigeration fan. When the running state of the linear compressor is normal, the speed of the current refrigeration fan is updated. The value of the second speed.

In a specific embodiment of the present invention, the preset ambient temperature threshold T0 is 10°C, the monitored ambient temperature T is 0°C, which is 10°C lower than the preset ambient temperature threshold, and the rotational speed of the refrigerating fan is controlled to be 2200r/min , so as to increase the stroke of the piston in the linear compressor. Afterwards, monitor the running status of the linear compressor. If the linear compressor runs abnormally, continue to increase the speed of the refrigeration fan according to the predetermined amplitude of 100r/min, and then increase the speed of the refrigeration fan to 2300r/min.

Furthermore, after the speed of the refrigeration fan increases to 2300r/min, the running status of the linear compressor will continue to be monitored. If the linear compressor is running abnormally, the speed of the refrigeration fan will continue to be increased according to the predetermined amplitude of 100r/min until the linear compressor Operating normally. In this embodiment, after the linear compressor runs normally, the rotation speed of the refrigeration fan is 2500r/min, and at the same time, the preset value of the second rotation speed is updated to the current rotation speed of the refrigeration fan 2500r/min. Afterwards, if the ambient temperature is lower than 10°C, the linear compressor will directly control the speed of the refrigeration fan to 2500r/min when it runs within a predetermined time. The speed control process of the refrigeration fan is a dynamic cycle process. When the linear compressor is started at low temperature, the refrigeration fan does not need to increase from the preset first speed according to a predetermined amplitude every time.

The following describes the refrigerator control method using a linear compressor in the third embodiment of the present invention. The refrigerator in this embodiment is an air-cooled refrigerator, and a refrigeration fan for heat exchange is provided between the refrigerator compartment and the freezer compartment. Methods include:

Monitor the ambient temperature T of the refrigerator;

Comparing the ambient temperature T with a preset ambient temperature threshold T0;

If T is greater than T0, control the speed of the refrigeration fan to be the first speed when the linear compressor runs within a predetermined time; if T is less than or equal to T0, control the speed of the refrigeration fan to be the second speed when the linear compressor runs within a predetermined time a rotational speed, wherein the second rotational speed is greater than the first rotational speed;

The steps above are the same as those in the first embodiment. Further, as shown in FIG. 5, this embodiment also includes:

Monitor the running status of the linear compressor;

When the running state of the linear compressor is abnormal, increase the predetermined amplitude on the current speed of the refrigeration fan;

When the linear compressor is running normally, set the current rotation speed of the refrigeration fan to the third rotation speed, associate the third rotation speed with the ambient temperature T, and control the rotation speed of the refrigeration fan to the third rotation speed when the ambient temperature is less than or equal to T.

Monitoring the running status of the linear compressor specifically includes:

Judging whether the linear compressor stops unexpectedly when running within the predetermined time;

If yes, it is considered that the running state of the linear compressor is abnormal.

Correspondingly, this embodiment also discloses a refrigerator control system using a linear compressor, which includes a temperature detection device and a main control board connected to the temperature monitoring device, wherein:

The temperature monitoring device is used to monitor the ambient temperature T of the refrigerator;

The main control board is used to compare the ambient temperature T with the preset ambient temperature threshold T0;

The main control board is also used to control the rotation speed of the refrigeration fan. If T is greater than T0, the rotation speed of the refrigeration fan is controlled to be the first rotation speed when the linear compressor runs within a predetermined time. If T is less than or equal to T0, when the linear Control the rotation speed of the refrigeration fan to be the second rotation speed when running within the time limit, wherein the second rotation speed is greater than the first rotation speed;

The main control board is also used to monitor the running state of the linear compressor. When the running state of the linear compressor is abnormal, a predetermined amplitude is added to the current speed of the refrigeration fan. When the running state of the linear compressor is normal, the current speed of the refrigeration fan is set to the second Three rotation speeds, the third rotation speed is associated with the ambient temperature T, and when the ambient temperature is less than or equal to T, the rotation speed of the refrigeration fan is controlled to be the third rotation speed.

In a specific embodiment of the present invention, the preset ambient temperature threshold T0 is 10°C, the monitored ambient temperature T is 0°C, which is 10°C lower than the preset ambient temperature threshold, and the rotational speed of the refrigerating fan is controlled to be 2200r/min , so as to increase the stroke of the piston in the linear compressor. Afterwards, monitor the running status of the linear compressor. If the linear compressor runs abnormally, continue to increase the speed of the refrigeration fan according to the predetermined amplitude of 100r/min, and then increase the speed of the refrigeration fan to 2300r/min.

Furthermore, after the speed of the refrigeration fan increases to 2300r/min, the running status of the linear compressor will continue to be monitored. If the linear compressor is running abnormally, the speed of the refrigeration fan will continue to be increased according to the predetermined amplitude of 100r/min until the linear compressor It runs normally and correlates the current rotation speed of the refrigeration fan with the current ambient temperature.

Specifically, in this embodiment, after the linear compressor runs normally, the speed of the refrigeration fan is 2500r/min, and the current speed of the refrigeration fan is 2500r/min, which is set as the third speed of the refrigeration fan, and the third speed is 2500r/min. min is associated with the current ambient temperature of 0°C. During the next operation of the refrigerator, if the monitored ambient temperature is less than or equal to 0°C, the speed of the refrigeration fan is directly controlled to the third speed of 2500r/min. If it is detected that the ambient temperature is between 0° C. and 10° C., the rotation speed of the refrigeration fan is still controlled according to the method in the second embodiment.

The control process of the rotation speed of the refrigeration fan in this embodiment is a dynamic cycle process. When the refrigerator is started at low temperature, the cooling fan does not need to increase from the preset rotation speed according to the predetermined amplitude every time.

Referring to Figure 6, the refrigerator control method using a linear compressor in the fourth embodiment of the present invention is introduced. The refrigerator in this embodiment is an air-cooled refrigerator or a direct-cooled refrigerator, and the refrigeration circuit includes an evaporator, a condenser, etc. A cooling fan for cooling the condenser is provided beside the condenser, and the control method includes:

Monitor the ambient temperature T of the refrigerator;

Comparing the ambient temperature T with a preset ambient temperature threshold T0;

If T is greater than T0, the speed of the cooling fan is controlled to be the fourth speed when the linear compressor runs within a predetermined time; if T is less than or equal to T0, the speed of the cooling fan is controlled to be the fifth speed when the linear compressor runs within a predetermined time rotation speed, wherein the fifth rotation speed is smaller than the fourth rotation speed.

Correspondingly, this embodiment also discloses a refrigerator control system using a linear compressor, which includes a temperature detection device and a main control board connected to the temperature monitoring device, wherein:

The temperature monitoring device is used to monitor the ambient temperature T of the refrigerator;

The main control board is used to compare the ambient temperature T with the preset ambient temperature threshold T0;

The main control board is also used to control the speed of the cooling fan. If T is greater than T0, the speed of the cooling fan is controlled to be the fourth speed when the linear compressor runs within a predetermined time. If T is less than or equal to T0, when the linear When running within a time period, the cooling fan is controlled to have a rotation speed of the fifth rotation speed, wherein the fifth rotation speed is smaller than the fourth rotation speed.

Generally, when the refrigerator works at a low temperature (the ambient temperature is less than or equal to the preset ambient temperature threshold), the heat load of the refrigerator is low, and the cooling capacity required by the compartment will be relatively low. At this time, the linear compressor will use a lower output power Running, the stroke of the piston of the linear compressor is small, and the piston may hit the exhaust valve plate, causing damage to the mechanical parts. The frequency conversion protection program of the existing linear compressor frequency conversion board is generally set, and the frequency conversion protection is turned on when the piston hits the exhaust valve plate, so that the refrigerator stops working. In order to prevent the linear compressor from being protected by the frequency conversion board, when the refrigerator is working at low temperature, it is necessary to forcibly change the operating conditions of the refrigerator.

In this embodiment, if T is greater than T0, the speed of the cooling fan is controlled to be the fourth speed, and if T is less than or equal to T0, the speed of the cooling fan is controlled to be the fifth speed, wherein the fifth speed is less than the fourth speed. Slow down the heat dissipation speed of the condenser. Under certain conditions, the cooling capacity required by the refrigerator is rated. After the cooling fan speed is reduced, the cooling capacity provided by the linear compressor per unit time will be reduced. In order to maintain the rated cooling capacity amount, the work of the piston in the linear compressor needs to be increased, that is, the stroke of the piston needs to be increased. Therefore, reducing the rotation speed of the cooling fan can increase the stroke of the piston in the linear compressor.

In a specific embodiment of the present invention, the preset ambient temperature threshold T0 is 10°C. When the ambient temperature T is higher than 10°C, when the linear compressor is running, the speed of the cooling fan is the fourth speed of 3000r/min. When it is detected that the ambient temperature T is less than or equal to T0, if the ambient temperature is 0°C, then when the linear compressor is running, the cooling fan is controlled to rotate at a fifth rotation speed of 2800r/min. In this way, the heat dissipation of the condenser can be slowed down. In order to obtain the same cooling capacity per unit time, the stroke of the piston in the linear compressor will increase.

The refrigerator control method using a linear compressor in the fifth embodiment of the present invention is introduced below. The refrigerator in this embodiment is an air-cooled refrigerator or a direct-cooled refrigerator. The refrigeration circuit includes an evaporator, a condenser, etc., and a There are cooling fans for cooling the condenser, the control method includes:

Monitor the ambient temperature T of the refrigerator;

Comparing the ambient temperature T with a preset ambient temperature threshold T0;

If T is greater than T0, the speed of the cooling fan is controlled to be the fourth speed when the linear compressor runs within a predetermined time; if T is less than or equal to T0, the speed of the cooling fan is controlled to be the fifth speed when the linear compressor runs within a predetermined time rotational speed, wherein the fifth rotational speed is less than the fourth rotational speed;

The above steps are the same as the fourth embodiment, further, as shown in Figure 7, this embodiment also includes:

Monitor the running status of the linear compressor;

When the running state of the linear compressor is abnormal, reduce the preset amplitude at the current speed of the cooling fan;

When the running state of the linear compressor is normal, the value of the fifth rotating speed is updated with the current rotating speed of the cooling fan.

Monitoring the running status of the linear compressor specifically includes:

Judging whether the linear compressor stops unexpectedly when running within the predetermined time;

If yes, it is considered that the running state of the linear compressor is abnormal.

Correspondingly, this embodiment also discloses a refrigerator control system using a linear compressor, which includes a temperature detection device and a main control board connected to the temperature monitoring device, wherein:

The temperature monitoring device is used to monitor the ambient temperature T of the refrigerator;

The main control board is used to compare the ambient temperature T with the preset ambient temperature threshold T0;

The main control board is also used to control the speed of the cooling fan. If T is greater than T0, the speed of the cooling fan is controlled to be the fourth speed when the linear compressor runs within a predetermined time. If T is less than or equal to T0, when the linear Control the speed of the cooling fan to be the fifth speed when running within the time limit, wherein the fifth speed is less than the fourth speed;

The main control board is also used to monitor the running state of the linear compressor. When the running state of the linear compressor is abnormal, the predetermined amplitude is reduced on the current speed of the cooling fan. When the running state of the linear compressor is normal, the current speed of the cooling fan Update the value of the fifth speed.

In a specific embodiment of the present invention, the preset ambient temperature threshold T0 is 10°C, the monitored ambient temperature T is 0°C, which is 10°C lower than the preset ambient temperature threshold, and the cooling fan speed is controlled to be 2800r/min , so as to increase the stroke of the piston in the linear compressor. Afterwards, monitor the running status of the linear compressor. If the linear compressor runs abnormally, continue to reduce the speed of the cooling fan according to the predetermined amplitude of 100r/min, and then increase the speed of the cooling fan to 2700r/min.

Further, after the speed of the cooling fan is reduced to 2700r/min, the running status of the linear compressor will continue to be monitored. If the linear compressor is running abnormally, the speed of the cooling fan will be reduced according to the predetermined amplitude of 100r/min until the linear compressor Operating normally. In this embodiment, after the linear compressor runs normally, the cooling fan rotates at 2500r/min, and at the same time, the preset value of the fifth rotating speed is updated to the current cooling fan's rotating speed of 2500r/min. Thereafter, if the ambient temperature is lower than 10°C, the linear compressor will directly control the speed of the cooling fan to 2500r/min when it runs within a predetermined time. The speed control process of the cooling fan is a dynamic cycle process. When the linear compressor is started at low temperature, the cooling fan does not need to decrease from the preset fourth speed according to a predetermined amplitude every time.

The following describes the refrigerator control method using a linear compressor in the sixth embodiment of the present invention. The refrigerator in this embodiment is an air-cooled refrigerator or a direct-cooled refrigerator. The refrigeration circuit includes an evaporator, a condenser, etc., and a There are cooling fans for cooling the condenser, the control method includes:

Monitor the ambient temperature T of the refrigerator;

Comparing the ambient temperature T with a preset ambient temperature threshold T0;

If T is greater than T0, the speed of the cooling fan is controlled to be the fourth speed when the linear compressor runs within a predetermined time; if T is less than or equal to T0, the speed of the cooling fan is controlled to be the fifth speed when the linear compressor runs within a predetermined time rotational speed, wherein the fifth rotational speed is less than the fourth rotational speed;

The above steps are the same as the fourth embodiment, further, as shown in Figure 8, this embodiment also includes:

Monitor the running status of the linear compressor;

When the running state of the linear compressor is abnormal, reduce the preset amplitude at the current speed of the cooling fan;

When the linear compressor is running normally, set the current speed of the cooling fan to the sixth speed, associate the sixth speed with the ambient temperature T, and control the speed of the cooling fan to the sixth speed when the ambient temperature is less than or equal to T.

Monitoring the running status of the linear compressor specifically includes:

Judging whether the linear compressor stops unexpectedly when running within the predetermined time;

If yes, it is considered that the running state of the linear compressor is abnormal.

Correspondingly, this embodiment also discloses a refrigerator control system using a linear compressor, which includes a temperature detection device and a main control board connected to the temperature monitoring device, wherein:

The temperature monitoring device is used to monitor the ambient temperature T of the refrigerator;

The main control board is used to compare the ambient temperature T with the preset ambient temperature threshold T0;

The main control board is also used to control the speed of the cooling fan. If T is greater than T0, the speed of the cooling fan is controlled to be the fourth speed when the linear compressor runs within a predetermined time. If T is less than or equal to T0, when the linear Control the speed of the cooling fan to be the fifth speed when running within the time limit, wherein the fifth speed is less than the fourth speed;

The main control board is also used to monitor the running state of the linear compressor. When the running state of the linear compressor is abnormal, the predetermined amplitude is reduced on the current speed of the cooling fan. When the running state of the linear compressor is normal, the current speed of the cooling fan is set to The sixth rotational speed, associating the sixth rotational speed with the ambient temperature T, and controlling the rotational speed of the cooling fan to the sixth rotational speed when the ambient temperature is less than or equal to T.

In a specific embodiment of the present invention, the preset ambient temperature threshold T0 is 10°C, the monitored ambient temperature T is 0°C, which is 10°C lower than the preset ambient temperature threshold, and the cooling fan speed is controlled to be 2800r/min , so as to increase the stroke of the piston in the linear compressor. Afterwards, monitor the running status of the linear compressor. If the linear compressor runs abnormally, continue to reduce the speed of the cooling fan according to the predetermined amplitude of 100r/min, and then reduce the speed of the cooling fan to 2700r/min.

Further, after the speed of the cooling fan is reduced to 2700r/min, the running status of the linear compressor will continue to be monitored. If the linear compressor is running abnormally, the speed of the cooling fan will be reduced according to the predetermined amplitude of 100r/min until the linear compressor The compressor is running normally and correlates the current speed of the cooling fan with the current ambient temperature.

Specifically, in this embodiment, after the linear compressor operates normally, the speed of the cooling fan is 2500r/min, and the current speed of the cooling fan is 2500r/min, which is set as the sixth speed of the cooling fan, and the sixth speed is 2500r/min. min is associated with the current ambient temperature of 0°C. During the next operation of the refrigerator, if the ambient temperature is detected to be less than or equal to 0°C, the speed of the cooling fan is directly controlled to the sixth speed of 2500r/min. If it is detected that the ambient temperature is between 0° C. and 10° C., the speed of the cooling fan is still controlled according to the method in the fifth embodiment.

The control process of the rotation speed of the cooling fan in this embodiment is a dynamic cycle process. When the refrigerator is started at low temperature, the cooling fan does not need to decrease successively from the preset rotation speed according to the predetermined amplitude every time.

It should be noted that the "predetermined time" defined in the present invention remains unchanged, that is, the running time of the linear compressor in different cycles remains unchanged, while the heating parameters of the heating device can be changed within the "predetermined time" of.

Furthermore, each embodiment of the present invention is described under the condition that the load of the refrigerator remains unchanged, and does not consider the temperature change in the refrigerator caused by external objects being put into the refrigerator, such as putting an object into the refrigerator during the operation of the refrigerator High-temperature food, etc., will cause an increase in the cooling capacity required by the refrigerator.

It can be seen from the above technical solutions that the present invention increases the stroke of the piston in the linear compressor by controlling the rotation speed of the refrigeration fan in the refrigerator or decreases the rotation speed of the cooling fan, and avoids the linear compressor being protected by the frequency conversion board. Refrigerator not working properly.

It should be understood that although this description is described according to implementation modes, not each implementation mode only contains an independent technical solution, and this description in the description is only for clarity, and those skilled in the art should take the description as a whole, and each The technical solutions in the embodiments can also be properly combined to form other embodiments that can be understood by those skilled in the art.

The series of detailed descriptions listed above are only specific descriptions of the feasible implementation modes of the application, and they are not intended to limit the protection scope of the application. Any equivalent implementation mode or All changes should be included within the scope of protection of this application.

Claims (12)

1. a kind of controlling method for refrigerator using linear compressor, it is characterised in that the control method includes：

Monitor the environment temperature T residing for refrigerator；

By the environment temperature T compared with default environment temperature threshold value T0；

If T is more than T0, when the rotating speed that the linear compressor runs time control fine frozen blower fan in the given time is the first rotating speed, If T is less than or equal to T0, when the rotating speed that the linear compressor runs time control fine frozen blower fan in the given time is second turn Speed, wherein, second rotating speed is more than first rotating speed.

2. the controlling method for refrigerator of linear compressor is used as claimed in claim 1, it is characterised in that methods described is also wrapped Include：

Monitor the linear compressor running status；

When the linear compressor running status exception, increase predetermined amplitude on freezing rotation speed of fan currently；

After the linear compressor running status is normal, second rotating speed is updated currently to freeze the size of rotation speed of fan Value.

3. the controlling method for refrigerator of linear compressor is used as claimed in claim 2, it is characterised in that monitor the straight line pressure Contracting machine running status specifically includes：

Judge whether surprisingly stop when the linear compressor is run in the given time；

If, then it is assumed that the linear compressor running status is abnormal.

4. a kind of refrigerator control system using linear compressor, it is characterised in that the control system fills including temperature monitoring The master control borad put and be connected with the device for detecting temperature, wherein,

The device for detecting temperature is used to monitor the environment temperature T residing for refrigerator；

The master control borad is used for the environment temperature T compared with default environment temperature threshold value T0；

The master control borad be additionally operable to control freezing blower fan rotating speed, if T is more than T0, when the linear compressor in the given time The rotating speed for running time control fine frozen blower fan is the first rotating speed, if T is less than or equal to T0, when the linear compressor is in the scheduled time The rotating speed of interior operation time control fine frozen blower fan is the second rotating speed, wherein, second rotating speed is more than first rotating speed.

5. the refrigerator control system of linear compressor is used as claimed in claim 4, it is characterised in that the master control borad is also used In monitoring the linear compressor running status, when the linear compressor running status exception, turn in currently freezing blower fan Increase predetermined amplitude in speed, after the linear compressor running status is normal, currently to freeze the renewal of the size of rotation speed of fan The value of second rotating speed.

6. the refrigerator control system of linear compressor is used as claimed in claim 5, it is characterised in that the master control borad is also used Whether surprisingly stop when judging that the linear compressor is run in the given time, if, then it is assumed that the linear compressor Running status is abnormal.

7. a kind of controlling method for refrigerator using linear compressor, it is characterised in that the control method includes：

Monitor the environment temperature T residing for refrigerator；

By the environment temperature T compared with default environment temperature threshold value T0；

If T is more than T0, when the rotating speed that the linear compressor runs time control cooling blower in the given time is the 4th rotating speed, If T is less than or equal to T0, when the rotating speed that the linear compressor runs time control cooling blower in the given time is the 5th turn Speed, wherein, the 5th rotating speed is less than the 4th rotating speed.

8. the controlling method for refrigerator of linear compressor is used as claimed in claim 7, it is characterised in that methods described is also wrapped Include：

Monitor the linear compressor running status；

When the linear compressor running status exception, reduce predetermined amplitude on current cooling blower rotating speed；

After the linear compressor running status is normal, the 5th rotating speed is updated with the size of current cooling blower rotating speed Value.

9. the controlling method for refrigerator of linear compressor is used as claimed in claim 8, it is characterised in that monitor the straight line pressure Contracting machine running status specifically includes：

Judge whether surprisingly stop when the linear compressor is run in the given time；

If, then it is assumed that the linear compressor running status is abnormal.

10. a kind of refrigerator control system using linear compressor, it is characterised in that the control system fills including temperature monitoring The master control borad put and be connected with the device for detecting temperature, wherein,

The device for detecting temperature is used to monitor the environment temperature T residing for refrigerator；

The master control borad is used for the environment temperature T compared with default environment temperature threshold value T0；

The master control borad be additionally operable to control cooling blower rotating speed, if T is more than T0, when the linear compressor in the given time The rotating speed for running time control cooling blower is the 4th rotating speed, if T is less than or equal to T0, when the linear compressor is in the scheduled time The rotating speed of interior operation time control cooling blower is the 5th rotating speed, wherein, the 5th rotating speed is less than the 4th rotating speed.

11. the refrigerator control system of linear compressor is used as claimed in claim 10, it is characterised in that the master control borad is also For monitoring the linear compressor running status, when the linear compressor running status exception, in current cooling blower Reduce predetermined amplitude on rotating speed, after the linear compressor running status is normal, with the size of current cooling blower rotating speed more The value of new 5th rotating speed.

12. the refrigerator control system of linear compressor is used as claimed in claim 11, it is characterised in that the master control borad is also Whether surprisingly stop during for judging that the linear compressor is run in the given time, if, then it is assumed that the straight line compression Machine running status is abnormal.