KR101379389B1 - Variable volume receiver, refrigerant cycle and the method of the same - Google Patents

Abstract

According to the present invention, it is possible to adjust the capacity for storing the refrigerant according to the change in operating conditions such as the outside air temperature or the load side temperature, and to ensure the appropriate subcooling degree even if the operating condition changes, the outside air temperature and the load side temperature change Regardless of the advantage, there is always an advantage that optimum operation is possible. In addition, in the present invention, since the refrigerant is stored in the bellows and the bellows is controlled to be compressed or extended, the amount of refrigerant stored in the receiver can be more easily adjusted. In addition, the present invention, the volume control plate for compressing or extending the bellows and the reciprocating portion for lifting and lowering it is made of a gear structure and a motor, it is possible to move the volume control plate more stably.

Description

Variable volume receiver for refrigeration cycle capable of controlling subcooling, refrigeration cycle comprising the same and control method thereof {Variable volume receiver, refrigerant cycle and the method of the same}

The present invention relates to a variable volume receiver for a refrigeration cycle that can control the supercooling degree, a refrigeration cycle including the same, and a control method thereof, and more particularly, by varying the volume of the receiver according to operating conditions to obtain an appropriate supercooling degree. It relates to a variable volume receiver for a refrigeration cycle that can be operated, a refrigeration cycle comprising the same and a control method thereof.

In general, during the operation of the refrigeration cycle, the operating conditions such as the outside temperature varies in various ways, accordingly, the appropriate amount of refrigerant required for driving the cycle also changes. In this regard, the charge amount of the refrigerant is determined based on the case where the required amount is large, and when the excess amount is generated during operation, the refrigerant charge amount is stored in the receiver. As such, the receiver plays a role of allowing the cycle to be stably operated under various conditions. However, since the storage space is predetermined, the receiver is selected to have room.

On the other hand, the refrigeration cycle has an optimum degree of superheat and optimum degree of subcooling, respectively, to maximize performance under given conditions. The superheat can be controlled using an electronic expansion valve or the like, but the supercooling degree which is affected by the amount of refrigerant charge is generally not controlled. In particular, in the case of the system to which the receiver is applied, the supercooling degree cannot be actively controlled due to the free space of the receiver, and thus there is a problem in that the operation in the optimum supercooling state that can maximize the performance of the cycle cannot be guaranteed.

On the other hand, the prior patent JP 2550632 increases or decreases the volume of the refrigerant storage space inside the receiver by directly using the refrigerant circulating the refrigerating cycle, but when using the refrigerant discharged from the compressor, a control operation for reducing the volume of the variable capacitor is smooth. In the case of using the compressor suction refrigerant, there is a problem that the control operation for increasing the volume of the variable capacitor is not smooth, and since the refrigerant circulating the refrigeration cycle is directly used, the refrigeration capacity may decrease. In practice, however, there is a very limited problem in terms of usability.

JP 2550632

An object of the present invention, by controlling the amount of refrigerant that can be stored in accordance with the operating conditions to actively control the supercooling degree of the cycle, variable volume receiver for a refrigeration cycle capable of adjusting the supercooling can be optimized operation, this It relates to a refrigeration cycle comprising and a control method thereof.

The present invention relates to a variable volume receiver for a refrigeration cycle, in which a receiver tank installed on a coolant flow path and a coolant installed in the receiver tank and temporarily passing through the coolant flow path are temporarily stored and compressed or expanded to adjust a volume. A bellows, a volume control plate provided to enable the linear reciprocation of the receiver tank, pressurizing or releasing the bellows while linearly reciprocating, and formed in the receiver tank so as to extend in a moving direction of the volume control plate, A guide rod coupled to the throttle plate to guide the linear reciprocating motion of the volume control plate, a reciprocating part for linear reciprocating motion of the volume control plate along the guide rod, and actuating the reciprocating part according to driving conditions, Linearly reciprocating the volume control plate to reduce the volume of the bellows. Sides and a controller for controlling the amount of refrigerant that can be stored inside the bellows.

The present invention relates to a refrigeration cycle including a compressor, a condenser, an expansion mechanism, an evaporator, and a control unit, comprising: a receiver tank installed in a refrigerant passage connecting the condenser and the expansion mechanism, and installed in the receiver tank, A bellows in which the refrigerant is temporarily stored, the volume is adjusted while being compressed or expanded, the receiver tank is provided to enable linear reciprocating movement, a volume control plate for pressurizing or releasing the bellows during linear reciprocating movement, and movement of the volume adjusting plate. It is formed in the longitudinal direction in the receiver tank, the volume control plate is coupled so as to move the guide rod for guiding linear reciprocating motion of the volume control plate, and the reciprocating portion for linear reciprocating motion of the volume control plate along the guide rod It includes, The control unit, coming out of the condenser The amount of refrigerant that can be stored in the bellows by calculating the supercooling degree according to the temperature and pressure of the refrigerant, controlling the reciprocating unit according to the calculated subcooling degree, advancing or retracting the volume control plate, and changing the volume of the bellows. To control.

In addition, the present invention, in the refrigerating cycle comprising a compressor, a condenser, an expansion mechanism, an evaporator and a control unit, the receiver tank is provided in the refrigerant passage connecting the condenser and the expansion mechanism, the slit hole is formed on the side, A bellows installed in the receiver tank, the refrigerant from the condenser is temporarily stored, the bellows of which the volume is adjusted while being compressed or expanded, and the receiver tank is provided for linear reciprocating movement, and pressurized or depressurized the bellows during the linear reciprocating movement. A volume control plate, a protrusion formed to protrude outward through the slit hole of the receiver tank from the volume control plate, and formed in the receiver tank to be elongated in a moving direction of the volume control plate, and screwed into the protrusion to protrude. A guide rod for guiding a linear reciprocating motion of the controller; And calculating the degree of supercooling according to the temperature and pressure of the refrigerant from the condenser, and controlling the reciprocating part according to the calculated degree of subcooling to move the volume control plate forward or backward and to vary the volume of the bellows. Control the amount of refrigerant that can be stored in the

In addition, the control method of the refrigerating cycle according to the present invention, by measuring the temperature and pressure of the refrigerant from the condenser, calculating the subcooling degree and the refrigerant is stored in the variable volume receiver according to the calculated subcooling degree And a volume adjusting step of adjusting the refrigerant storage amount by increasing or decreasing the volume of the bellows, wherein the volume adjusting step lowers the volume control plate fitted to the guide rod when the calculated subcooling degree is greater than or equal to a preset supercooling degree. The pressure applied to the bellows by the throttle plate is reduced to increase the volume in the bellows, and if the calculated subcooling degree is less than a predetermined subcooling degree, the volume control plate fitted to the guide rod is lifted so that the volume throttle plate is lowered. The pressure on the bellows is increased to reduce the volume in the bellows. It should.

According to the present invention, it is possible to adjust the capacity for storing the refrigerant according to the change in operating conditions such as the outside air temperature or the load side temperature, and to ensure the appropriate subcooling degree even if the operating condition changes, the outside air temperature and the load side temperature change Regardless of the advantage, there is always an advantage that optimum operation is possible.

In addition, since the present invention stores the refrigerant in the bellows and controls the bellows to be compressed or expanded, it is easier to adjust the refrigerant storage amount of the receiver than the prior art which directly uses the refrigerant whose state changes according to the operating conditions. .

In addition, the present invention, the volume control plate for compressing or extending the bellows and the reciprocating portion for lifting and lowering it is made of a gear structure and a motor, it is possible to move the volume control plate more stably.

1 is a view showing a state in which the bellows volume is reduced in the refrigeration cycle according to an embodiment of the present invention.
2 is a view showing a state in which the volume of the bellows increased in the refrigeration cycle shown in FIG.
3 is a cross-sectional view showing the structure of the variable volume receiver shown in FIG.
4 is an exploded perspective view of the variable volume receiver shown in FIG. 3.
FIG. 5 is a diagram showing a modification of the tube portion shown in FIG. 4. FIG.
6 is a control block diagram of a refrigeration cycle according to an embodiment of the present invention.
7 is a control flowchart of a refrigeration cycle according to an embodiment of the present invention.

Hereinafter, a refrigeration cycle including a variable volume receiver according to an embodiment of the present invention will be described with reference to the accompanying drawings.

1 and 2, a refrigeration cycle according to the present invention includes a compressor 2, a condenser 4, a variable volume receiver 20, an expansion valve 8, an evaporator 6, and a controller 100. Include.

1 to 4, the variable volume receiver 20 includes a receiver tank 30, a bellows 23, a volume control plate 34, a guide rod 40, 50, and a reciprocating part.

The bellows 23 forms a refrigerant storage space 22 in which refrigerant passing through the refrigerant passage of the refrigeration cycle is temporarily stored. The bellows 23 has a plurality of corrugations are formed in the axial direction and the volume is adjusted while being compressed or stretched, thereby adjusting the amount of refrigerant that can be stored therein. The bellows 23 is provided with a refrigerant inlet 23b through which the refrigerant passing through the refrigerant passage flows, and a refrigerant discharge port 23a through which the refrigerant in the bellows 23 is discharged into the refrigerant passage. The bellows 23 is installed in the receiver tank 30, and is compressed or extended in the receiver tank 30. In the present embodiment, the bellows 23 is provided on the upper side of the receiver tank 30, the volume control plate 34 is provided below the bellows 23, for example, will be described.

The receiver tank 30 is coupled to a cylindrical portion 31 having an upper and a lower surface opened, an upper cover 33 coupled to an opened upper surface of the cylindrical portion 31, and an opened lower surface of the cylindrical portion 31. Consisting of a lower cover 32. However, the present invention is not limited thereto, and the cylindrical part 31 and the upper cover 33 or the cylindrical part 31 and the lower cover 32 may be integrally formed.

On the outer circumferential surface of the cylindrical portion 31 is formed a slit hole 31a elongated in the axial direction. One slit hole 31a may be formed, or a plurality of slit holes 31a may be formed. In the present embodiment, three slit holes 31a are formed so as to be spaced apart from each other by a predetermined interval, for example. The number of the slit holes 31a corresponds to the number of protrusions 35 and 36 of the volume control plate 34 to be described later. The number of the slit holes 31a and the protrusions 35 and 36 is preset in a range that can maintain an equilibrium state when the volume control plate 34 is raised or lowered. The slit hole 31a may be formed to have a predetermined length as shown in FIG. 4.

Upper and lower flange portions 31b and 31d to which the guide rod 40 is coupled are formed on the upper and lower sides of the slit hole 31a in the tube portion 31. The upper flange portion 31b is formed with a first coupling hole 31c to which the upper end of the guide rod 40 is coupled. The lower flange portion 31d is formed with a second coupling hole 31e to which the lower end of the guide rod 40 is coupled.

Inlet 33a and outlet 33b are formed in the upper cover 33 to allow the refrigerant inlet 23b and the refrigerant outlet 23a of the bellows 23 to pass therethrough.

The volume control plate 34 is arranged to support the lower surface of the bellows 23 provided in the receiver tank 30. The volume control plate 34 may be coupled to the bottom surface of the bellows 23, or may be disposed to contact the bottom surface. The volume control plate 34 is configured to compress or extend the bellows 23 while raising or lowering. The volume control plate 34 presses or releases the bellows 23 while linearly reciprocating in the direction in which the bellows 23 is stretched and contracted. The volume control plate 34 has a disc shape, and protrusions 35 and 36 protruding to the outside of the receiver tank 30 through the slit hole 31a are formed on a circumferential surface thereof.

For example, the protrusions 35 and 36 are formed to be spaced apart from each other by three to correspond to the number of the slit holes 31a. However, the present invention is not limited thereto, and the number of the protrusions 35 and 36 and the slit holes 31a correspond to each other, but the number of ranges that can maintain an equilibrium state when the volume control plate 34 rises and falls. It can be set to. The protrusions 35 and 36 have coupling holes 35a and 36a to which the guide rods 40 and 50 are coupled.

The guide rods 40 and 50 are formed in three to correspond to the number of the protrusions 35 and 36. The three guide rods 40 and 50 are formed of a first guide rod 40 having a male thread portion 41 formed on a circumferential surface thereof, and a flat surface having no male thread portion 41 formed on the circumferential surface thereof. And two or three guide rods 51 and 52. In the present embodiment, for example, the male thread portion 41 is formed in only one of the three guide rods 40 and 50, but is not limited thereto, and the male thread portion 41 is formed in at least one. It is also possible.

The upper end 42 of the first guide rod 40 is rotatably coupled to the upper flange portion 31b, and the lower end 43 of the first guide rod 40 is attached to the lower flange portion 31d. Combined to be rotatable. Upper and lower ends 42 of the first guide rods 40 are disposed in the first and second coupling holes 31c and 31e to which the upper and lower ends 42 and 43 of the first guide rods 40 are coupled. A bearing (not shown) for rotatably supporting 43 may be installed.

The upper and lower ends 51a and 51b of the second and third guide rods 51 and 52 are fixedly coupled to the upper and lower flange portions 31b and 31d.

The protrusions 35 and 36 may include a first protrusion 35 coupled to the first guide rod 40 and second and third protrusions coupled to the second and third guide rods 51 and 52. 36). The first screw hole 35a of the first protrusion part 35 is formed with a female screw part 35b engaged with the male screw part 41 of the first guide rod 40. The second and third coupling holes 36a of the second and third protrusions 36 are through holes through which the second and third guide rods 51 and 52 pass.

The reciprocating part includes a motor 60 for rotating the male thread part 41, the female thread part 35b, and the first guide rod 40.

The motor 60 is a motor capable of bidirectional rotation. For example, the motor 60 is installed below the receiver tank 30. However, the motor 60 is not limited thereto, and the motor 60 may be installed anywhere as long as it can rotate the guide rod 40. .

A bevel gear is provided between the rotating shaft of the first guide rod 40 and the rotating shaft 61 of the motor 60. A first bevel gear 44 is coupled to a lower end of the first guide rod 40, and a second bevel gear meshed with the first bevel gear 44 at an end of the rotation shaft 61 of the motor 60. 62) is combined.

The refrigeration cycle, the temperature sensor 10 for measuring the temperature (T) of the refrigerant from the condenser 4, and the pressure sensor 12 for measuring the pressure (P) of the refrigerant from the condenser (4) It includes more.

The controller 100 calculates the subcooling degree according to the values detected from the temperature sensor 10 and the pressure sensor 12, compares the calculated subcooling degree with a preset subcooling range, and accordingly To control operation. In the present embodiment, for example, the controller 100 controls the operation of the motor 100 according to the supercooling degree, but is not limited thereto. It is of course also possible to control the operation.

On the other hand, Figure 5 is a view showing a modification of the tube portion shown in FIG.

Referring to FIG. 5, the slit hole 101a is formed to open to the lower end of the cylinder portion 101. When the slit hole 101a is opened to the lower end of the tube portion 101, the volume adjusting plate 34 can be easily fitted. An upper flange portion 101b and a coupling hole 101c are formed at an upper side of the slit hole 101a in the tube portion 101 so that the upper end of the guide rod 40 is rotatably coupled thereto. The lower flange portion 102 to which the lower end of the guide rod 40 is rotatably coupled to the lower portion of the slit hole 101a is manufactured and coupled separately. The lower flange portion 102 may be fastened and fixed by a fastening member or the like after being fitted into the slit hole 101a.

Referring to the control method and operation according to an embodiment of the present invention configured as described above are as follows.

Referring to FIG. 7, first, the controller 100 calculates the degree of supercooling of the refrigerant from the condenser 4. Measure the temperature (T) and pressure (P) of the refrigerant from the condenser (4). The temperature sensor 10 measures the temperature T of the refrigerant exiting the condenser 4, and the pressure sensor 12 measures the pressure P of the refrigerant exiting the condenser 4. The saturation temperature Tsat of the refrigerant can be known from the pressure P of the refrigerant measured by the pressure sensor 12. The subcooling degree may be calculated by calculating a difference between the saturation temperature Tsat and the measured temperature T of the refrigerant. (S1)

The calculated subcooling degree is compared with a preset subcooling degree (S2), and accordingly the operation of the motor 60 is controlled to compress or expand the bellows 23, thereby reducing or increasing the volume in the bellows 23. . The volume of the bellows 23 is changed by the compressor 2, the condenser 4, and the expansion valve 8 except for the amount of refrigerant stored in the refrigerant storage space 22 of the variable volume receiver 20. , The actual charge amount of the cycle defined as the sum of the amount of refrigerant charged in the evaporator 6 and their connecting pipes is changed, which leads to a change in the degree of supercooling, and thus, the control of the motor 60 Supercooling can be controlled.

That is, if the calculated subcooling degree is equal to or higher than the preset subcooling degree, it is determined that the actual filling amount is larger than the optimum filling amount. Therefore, the volume of the bellows 23 is increased to control the amount of refrigerant stored in the bellows 23.

In order to increase the volume of the bellows 23, the controller 100 rotates the motor 60 in the first direction. Here, the first direction is described as counterclockwise, for example. (S3) When the motor 60 is rotated counterclockwise, the first guide rod 40 rotates counterclockwise. When the first guide rod 40 rotates in the counterclockwise direction, the volume adjusting plate 34 is lowered by the engagement of the first guide rod 40 and the female screw portion 35b. At this time, the first, second and third protrusions 35 and 36 of the volume control plate 34 move downward along the first, second and third guide rods 40 and 51 and 52. As described above, when the volume control plate 34 is lowered, the pressure applied by the volume control plate 34 to the bellows 23 is reduced, so that the bellows 23 extends and the volume of the bellows 23 increases. . As the volume of the bellows 23 increases, the amount of refrigerant that can be stored increases, the actual amount of charge in the refrigeration cycle decreases, and the amount of refrigerant inside the condenser 4 also decreases. Therefore, since the supercooling degree of the refrigerant is reduced, it is possible to adjust the preset subcooling range.

On the other hand, if the calculated subcooling degree is less than the preset subcooling degree, it is determined that the actual filling amount in the refrigeration cycle should be increased. Therefore, the volume of the bellows 23 is reduced to control the amount of refrigerant stored in the bellows 23.

In order to reduce the volume of the bellows 23, the controller 100 rotates the motor 60 in the second direction. Here, for example, the second direction is a clockwise direction opposite to the first direction. (S5)

When the motor 60 rotates clockwise, the first guide rod 40 rotates clockwise. When the first guide rod 40 rotates in the clockwise direction, the volume adjusting plate 34 is raised upward by the engagement of the first guide rod 40 and the female screw part 35b. At this time, the first, second and third protrusions 35 and 36 of the volume control plate 34 move upward along the first, second and third guide rods 40 and 51 and 52. As described above, when the volume control plate 34 is raised and lowered, the volume control plate 34 presses the bellows 23, and the bellows 23 is compressed to decrease in volume. As the volume of the bellows 23 decreases, the amount of refrigerant that can be stored decreases, the actual charge amount increases, and the amount of refrigerant inside the condenser 4 increases. Therefore, since the supercooling degree of the refrigerant is increased, it is possible to adjust the preset subcooling range.

As described above, by rotating the motor 60 and the first guide rod 40, by compressing or extending the bellows 23, the refrigerant storage amount can be adjusted, and thus the supercooling degree of the refrigerant is set in a predetermined range. It is possible to adjust with.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

2: compressor 4: condenser
20: variable volume receiver 23: bellows
22: refrigerant storage space 30: receiver tank
31: cylinder 32: lower cover
33: upper cover 34: volume control plate
35: first protrusion 35b: female thread
36: second and third protrusions 40: first guide rod
41: male part 51: second guide rod
52: third guide rod 60: motor

Claims (9)

In a variable volume receiver for a refrigeration cycle,
A receiver tank provided on the coolant flow path, the receiver tank having a slit hole formed at a side thereof;
A bellows installed in the receiver tank and temporarily storing the refrigerant passing through the refrigerant passage, and adjusting the volume while compressing or expanding the refrigerant;
A volume control plate provided in the receiver tank so as to be capable of linear reciprocating movement and pressurizing or releasing the bellows while linearly reciprocating;
A protrusion formed to protrude outward from the volume control plate through the slit hole;
A guide rod extending in the moving direction of the volume control plate and installed in the receiver tank and screwed with the protrusion to guide linear reciprocation of the volume control plate;
A reciprocating unit configured to linearly reciprocate the volume control plate along the guide rod;
The refrigeration cycle is adjustable for subcooling by operating the reciprocating unit in accordance with the operating conditions, the volume control plate linearly reciprocating to change the volume of the bellows, and a control unit for controlling the amount of refrigerant that can be stored in the bellows Variable volume receiver. In a refrigeration cycle comprising a compressor, a condenser, an expansion device, an evaporator and a control unit,
A receiver tank installed in a refrigerant passage connecting the condenser and the expansion mechanism and having a slit hole formed at a side thereof;
A bellows installed in the receiver tank and temporarily storing the refrigerant from the condenser and adjusting the volume while compressing or expanding the refrigerant;
A volume control plate provided in the receiver tank so as to be capable of linear reciprocating movement and pressurizing or releasing the bellows while linearly reciprocating;
A guide rod extending in the moving direction of the volume control plate and installed in the receiver tank, and having a male thread formed on a circumferential surface thereof so that the volume control plate is movable to guide the linear reciprocating motion of the volume control plate;
A protruding portion formed to protrude outward from the volume control plate through the slit hole, and having a coupling hole having a female screw portion formed on an inner circumferential surface thereof so that the male screw portion of the guide rod is coupled;
A motor for rotating the guide rod,
The control unit calculates the subcooling degree according to the temperature and pressure of the refrigerant from the condenser, controls the operation of the motor according to the calculated subcooling degree, and moves the volume control plate forward or backward and varies the volume of the bellows. Refrigeration cycle for controlling the amount of refrigerant that can be stored in the bellows. delete delete delete The method of claim 2,
A refrigeration cycle is provided between the rotating shaft of the guide rod and the rotating shaft of the motor. The method of claim 2,
The guide rod is provided in plurality,
The volume control plate is formed with a plurality of protrusions coupled to the plurality of guide rods,
The male screw unit is formed on at least one circumferential surface of the plurality of guide rods. In a refrigeration cycle comprising a compressor, a condenser, an expansion device, an evaporator and a control unit,
A receiver tank installed in a refrigerant passage connecting the condenser and the expansion mechanism and having a slit hole formed at a side thereof;
A bellows installed in the receiver tank and temporarily storing the refrigerant from the condenser and adjusting the volume while compressing or expanding the refrigerant;
A volume control plate provided in the receiver tank so as to be capable of linear reciprocating movement and pressurizing or releasing the bellows while linearly reciprocating;
A protrusion formed to protrude outward from the volume control plate through a slit hole of the receiver tank;
A guide rod extending in the moving direction of the volume control plate and installed in the receiver tank and screwed with the protrusion to guide linear reciprocating motion of the protrusion;
It includes a reciprocating unit for linearly reciprocating the volume control plate along the guide rod,
The control unit calculates the supercooling degree according to the temperature and pressure of the refrigerant from the condenser, and controls the reciprocating unit according to the calculated subcooling degree to move the volume control plate forward or backward and vary the volume of the bellows. A refrigeration cycle for controlling the amount of refrigerant that can be stored inside the bellows. A subcooling degree calculating step of measuring a temperature and a pressure of the refrigerant from the condenser and calculating a subcooling degree;
And a volume adjusting step of controlling the refrigerant storage amount by increasing or decreasing the volume of the bellows in which the refrigerant is stored in the variable volume receiver according to the calculated subcooling degree.
The volume adjusting step may include the step of increasing the volume in the bellows by reducing the pressure applied by the volume control plate to the bellows by lowering the volume control plate fitted to the guide rod when the calculated subcooling degree is greater than or equal to a preset subcooling degree. If the calculated degree of subcooling is less than a predetermined degree of subcooling, lifting the volume control plate engaged with the guide rod to increase the pressure applied by the volume control plate to the bellows, thereby reducing the volume in the bellows.
A slit hole is formed on the side of the variable volume receiver in the moving direction of the volume control plate, and the volume control plate is provided with a protrusion protruding outward through the slit hole, so that the protrusion is fitted to the guide rod. Control method.

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