JP2002295901A - Heat pump water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat pump hot-water supplier that is improved in operational efficiency and is constituted to effectively utilize the hot-water capacity of a hot water storage tank. SOLUTION: This heat pump hot-water supplier is provided with a detecting means 12 which detects the boiling up of the whole hot water stored in a hot water storage tank 5 immediately before the completion of the boiling up, a canceling means 13 which cancels the detection of the boiling up of the hot water detected by means of the detecting means 12 immediately before the completion of the boiling up, and a control means 11 which controls a pressure reducing device 3 to be opened upon receiving a first signal from the detecting means 12 and to be closed upon receiving a second signal from the canceling means 13. Since the control means 11 controls the device 3 to be opened when the discharge pressure of the tank 5 rises as the boiling up of the hot water approaches the completion, this hot-water supplier can be operated to supply and heat hot water until the hot-water supply temperature becomes high and, accordingly, can effectively utilize the hot-water capacity of the tank 5. In addition, since the pressure reducing device 3 is controlled to be closed when the hot-water supply temperature drops due to hot water delivery, etc., thereafter, this hot-water supplier can be operated efficiently to supply and heat hot water.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water supply type heat pump water heater.

[0002]

2. Description of the Related Art A conventional heat pump water heater will be described below. A conventional heat pump water heater of this type is disclosed in Japanese Patent Application Laid-Open No. 60-164157. FIG. 11 is a block diagram showing a configuration of the conventional heat pump water heater. In FIG. 11, a compressor 1, a refrigerant / water heat exchanger 2, a pressure reducing device 3, and an evaporator 4
And a hot water supply circuit in which a hot water storage tank 5, a circulation pump 6, a refrigerant-to-water heat exchanger 2, and an auxiliary heater 7 are sequentially connected, and a high temperature discharged from the compressor 1. The high-pressure superheated gas refrigerant flows into the refrigerant-to-water heat exchanger 2, where it heats the water sent from the circulation pump 6. Then, the condensed and liquefied refrigerant is decompressed by the decompression device 3 and flows into the evaporator 4, where it absorbs atmospheric heat to evaporate and return to the compressor 1.

On the other hand, the hot water heated by the refrigerant / water heat exchanger 2 flows into the upper part of the hot water storage tank 5 and is gradually stored from above. Then, when the inlet water temperature of the refrigerant-to-water heat exchanger 2 reaches a predetermined set value, the feedwater temperature detecting means 8 detects this, stops the heat pump operation by the compressor 1, and sets the auxiliary heater 7
Switch to single operation.

[0004]

However, in the above-described conventional configuration, a hot / water mixed layer is formed at a portion where hot water and water in hot water storage tank 5 come into contact with the elapse of the boiling operation time. continue to gradually expand. FIG. 12 shows a hot water tank 5
It is a characteristic diagram showing the temperature distribution of the hot water in the. In FIG. 12, (a) schematically shows a cross section of the hot water storage tank 5, and (b) shows a temperature distribution of the hot water. T1 is the boiling temperature (hot water),
T2 is a city water temperature (low temperature hot water). The above-mentioned hot-water mixture layer is generated by heat conduction and convection between high-temperature hot water and low-temperature hot water, and is transferred from high-temperature hot water to low-temperature hot water. The temperature rises.
Therefore, when the boiling of the hot water storage tank 5 is nearly completed, the temperature of the supply water flowing into the refrigerant-to-water heat exchanger 2 increases.
As the discharge pressure of the compressor 1 increases, the durability of the compressor 1 becomes a problem, such as an increase in the winding temperature of the motor.

FIG. 13 is a characteristic diagram showing the relationship between the feed water temperature and the discharge pressure of the compressor 1. In FIG. 13, P
Is the normal upper limit pressure, and in order to guarantee the durability of the compressor 1, it is necessary to operate the compressor 1 at the normal upper limit pressure P or lower in normal operation. The feedwater temperature at the normal upper limit pressure P is T3
Becomes The lower limit of the effective hot water temperature is Tu (for example, 45
ΔC), and T3 and Tu are shown in FIG. In the hot water tank 5 shown in FIG. 12 (a), water temperature T
The region of 3 or less is a region that can be boiled, and the region of Tu or more is a region that can be used as effective hot water. But,
The area between the hot water temperatures T3 and Tu (shaded area) is an area that cannot be used as effective hot water.

[0006] In this way, conventional configuration, since the water temperature flowing through the refrigerant-water heat exchanger 2 is not forced to stop the operation at a low state, the lower portion of the hot water storage tank 5 is stopped in a state of low temperature water will be, it can not be utilized effectively hot water capacity of the hot water storage tank 5. Therefore, the amount of hot water stored decreases, and the hot water supply load cannot be satisfied. As one method for solving this, it is conceivable to increase the capacity of the hot water storage tank 5. But,
In this case, the footprint of the hot water storage tank 5 becomes large, the degree of freedom of installation is limited and there is a problem that the cost becomes high. Further, as another method, there is a method of increasing the amount of stored hot water by operating the auxiliary heater 7 alone after stopping the heat pump operation. However, in this case, there is a problem that power consumption increases and efficiency decreases because heating is performed by a heater or the like.

[0007] The present invention solves the above-mentioned conventional problems. There is no abnormal temperature rise and abnormal pressure rise of the compressor 1, high-temperature hot water can be stored to the lower part of the hot water storage tank 5 with low power consumption, and the hot water capacity can be reduced. An object is to provide a heat pump water heater that can be used effectively.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a means for detecting immediately before boiling of the entire hot water tank, and a means for detecting immediately before the completion of boiling of the entire hot water tank. The valve opening of the pressure reducing device is opened by a first signal which is output by detecting immediately before the completion of the boiling by the means for immediately before the completion of the boiling and a means for detecting immediately before the completion of the boiling, and and control means for controlling to close the valve opening of the pressure reducing device with a second signal and outputting the detected that no longer immediately before the completion boiling is completed immediately before releasing means boiling the in valve opening state by the signal It is a heat pump water heater provided with.

[0009] With this arrangement, when the boiling is nearly completed and the discharge pressure of the compressor rises in response to the rise of the feedwater temperature, the discharge pressure is controlled to be low by opening the valve opening of the pressure reducing device. enables hot water heating operation to a high temperature of the feed water temperature, further, when the feed water temperature is lowered in such the pouring state of the valve opening, and controls so as to close the valve opening of the pressure reducing device, an efficient Hot water supply heating operation becomes possible.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention according to claim 1 is a refrigerant circulation circuit in which a compressor, a refrigerant-to-water heat exchanger, a pressure reducing device for controlling the flow rate of refrigerant, and an evaporator are sequentially connected, and a hot water tank. , circulation pump, and a hot water supply circuit connected to the refrigerant-water heat exchanger sequentially, the flow rate of the circulation pump to the boiling temperature of water side outlet temperature of the refrigerant to water heat exchanger constant Flow rate control means for controlling, immediately before the completion of boiling of the entire hot water storage tank, detection means for immediately before the completion of boiling, and immediately before completion of the hot water storage tank, the release means for canceling the detection of immediately before the boiling of the entire hot water storage tank; The valve opening degree of the pressure reducing device is opened by a first signal output when the immediately before completion detecting means detects immediately before the boiling, and the releasing means immediately before the completion of the boiling is immediately opened in the state of the valve opening by the first signal. A heat pump water heater and a control means for controlling to close the valve opening of the pressure reducing device with a second signal output when detecting that was not.

In the present invention, the means for detecting immediately before the completion of boiling is a means for detecting immediately before the entire hot water tank boils, and in the embodiment, a feed water temperature detecting method for detecting a temperature of water supplied from the hot water tank to the refrigerant-to-water heat exchanger. and means becomes just before boil up when it detects a predetermined boiling immediately before completion detecting temperature, and outputs a first signal. Further, the means for immediately before the completion of boiling is a means for detecting that the whole hot water tank is no longer just before boiling due to tapping water after the immediately before boiling is detected, and in the embodiment, the water supply temperature detecting means is a predetermined type. When the release temperature immediately before the completion of boiling is detected, it is determined that the temperature has disappeared immediately before the boiling and a second signal is output. Note that the release temperature immediately before the completion of boiling is, from the gist thereof, a temperature lower than the detected temperature immediately before the completion of boiling.

When the discharge pressure of the compressor rises in response to the rise of the feedwater temperature when the boiling is almost completed, the control means controls the valve opening of the pressure reducing device to be open to suppress the discharge pressure. Therefore, the hot water supply heating operation can be performed up to the high supply water temperature, the useless area that cannot be used as effective hot water is reduced, and the hot water capacity of the hot water storage tank can be used effectively. Further, thereafter because if the water temperature is lowered in such tapping is controlled so as to close the valve opening of the pressure reducing device, it is possible to good hot water heating operation efficiency.

According to a second aspect of the present invention, a discharge pressure detecting means is provided as a means for detecting immediately before the completion of boiling and a means for canceling immediately before the completion of boiling, wherein the discharge pressure detecting means is provided with a first predetermined pressure corresponding to immediately before the boiling. A first signal is output when the discharge pressure is detected, and a second signal is detected when a predetermined second discharge pressure corresponding to when the valve is opened immediately before boiling in the open state of the first signal and disappears. A heat pump water heater according to claim 1, wherein the heat pump water heater outputs the heat.

[0014] In the present invention, the discharge pressure detecting means, since the discharge pressure of the compressor is correlated with the water supply temperature, functions as immediately before completion detecting means and the boiling before completion release means boiling by detecting the discharge pressure I do. In the embodiment, when a predetermined pressure immediately before the completion of the boiling corresponding to the detected temperature immediately before the completion of the boiling is detected, the first signal is output as the detection just before the boiling is detected, and the first signal is output. outputting a second signal as lost just before boil up upon detection of a predetermined boiling immediately before completion releasing pressure.

Since the control means directly controls the discharge pressure and optimally changes the valve opening of the pressure reducing device in accordance with the discharge pressure, the durability of the compressor is more reliably improved, and the efficiency is improved. Good hot water supply heating operation becomes possible.

[0016] The present invention is related to claim 3, as immediately before completion releasing means boiling, and a timer for measuring the tapping detection unit and hot water time to detect that it has tapped from the hot water storage tank,
2. The heat pump hot water supply according to claim 1, wherein the timer outputs a second signal when measuring a predetermined tapping time which is not immediately before boiling in a state where the valve is opened by the first signal of the boiling signal detection means immediately before completion of boiling. Machine.

In the present invention, the tapping detecting means and the timer function as the releasing means immediately before the completion of boiling. That is, the timer measures the elapsed time from the start of hot water supply, replaces the drop in feed water temperature at the time of hot water supply with time, detects that the temperature has reached the release temperature immediately before the completion of boiling, and outputs a second signal.
Control means, because at the time immediately before completion detecting boiling control to open the valve opening of the pressure reducing device, can be effectively used hot water capacity of the hot water tank, and detected by the tapping detection means then that the pouring in, the timer Since the detection of immediately before the completion of boiling is canceled and the valve opening of the pressure reducing device is controlled to be closed, the hot water supply heating operation can be efficiently performed with respect to a decrease in the supply water temperature.

According to a fourth aspect of the present invention, there is provided a heat pump water heater according to the third aspect, further comprising a tapping temperature detecting means for detecting a temperature of hot water from a hot water storage tank as the tapping detecting means.

[0019] In the present invention, the control means, hot water temperature detecting means and controls so as to close the valve opening of the decompressor when detecting the tapping by detecting the hot water temperature, the efficiency of the relative reduction in the feed water temperature Good hot water supply heating operation becomes possible.

[0020] Hereinafter, a description will be given of an embodiment of the present invention.

[0021]

(Embodiment 1) Hereinafter, Embodiment 1 of a heat pump water heater according to the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of the present embodiment. The same components as the conventional example and detailed description thereof will be omitted by assigning the same reference numerals. In FIG. 1, a flow rate control means 10 controls a rotation speed of a circulation pump 6 by a signal from a boiling temperature detecting means 9 provided at a water side outlet of the refrigerant-to-water heat exchanger 2 to control the refrigerant-to-water heat Boil the water so that the outlet water temperature (boiling temperature) of the exchanger 2 becomes substantially constant.
In addition, the control means 11 includes a first signal from the immediately before boiling completion detecting means 12 for detecting immediately before the completion of boiling, or a immediately before boiling complete releasing means 13 for canceling the detection of immediately before the completion of boiling. Control the valve opening of the pressure reducing device 3 with the second signal from Further, the state storage means 14
Stores whether or not the immediately before boiling completion detecting means 12 has detected immediately before the completion of boiling. In addition, 15 is a water supply pipe.

In this embodiment, the water supply temperature detecting means 12 for detecting the water supply temperature which is the water-side inlet water temperature of the refrigerant-to-water heat exchanger 2 is used as the means 12 for detecting immediately before the completion of boiling and the means 13 for releasing immediately before the completion of boiling. 8 is used. The pressure reducing device 3 includes an electric expansion valve and the like.

The operation and operation of the above configuration will be described. First, the case where there is no cancellation immediately before the completion of boiling will be described. FIG. 2 is a characteristic diagram showing an operation in the case where there is no release immediately before the completion of boiling. In FIG. 2, (a), detection state immediately before completion detecting means 12 boiling, (b) the operating conditions, the compressor 1 is (c) decompression device 3 of the valve opening degree, (d)
Indicates the discharge pressure, and (e) indicates the feedwater temperature, corresponding to the operation time.

[0025] As described in the conventional example, at the close completion boiling of the hot water storage tank 5, the feed water temperature flowing into the refrigerant-water heat exchanger 2 is increased. That is, when the water flowing into the refrigerant-water heat exchanger 2 is part of the hot and cold water mixing layer described above,
As shown in (e), the feedwater temperature rises with the operation time. Then, the feed water temperature detecting means 8 which is the detecting means 12 immediately before the completion of the boiling is detected by the detected temperature Th immediately before the completion of the boiling.
When detecting (a temperature lower than the boiling temperature T1), a first signal is output, and the control means 11 increases (opens) the valve opening of the pressure reducing device 3 in accordance with the first signal.
Together, and stores the detection of the immediately preceding completion boiling state storage unit 14 immediately before the completion detecting means 12 boiling to. At this time, the discharge pressure is reduced from P1 P2. Thereafter, as the operation time elapses, the feedwater temperature further rises, and the discharge pressure rises accordingly. Then, the feedwater temperature detecting means 8 detects that the feedwater temperature T3a becomes the normal upper limit pressure P.
Upon detection of the compressor 1 is stopped to end the hot water heating operation. The thick dotted line in FIG. 2 shows the operation in the case of the conventional example in which the control of the valve opening of the pressure reducing device 3 is not performed. This shows that the supply water temperature at the operation limit increases from T3 to T3a, and the operation range becomes large.

FIG. 3 is a characteristic diagram showing a temperature distribution of hot water in hot water storage tank 5. 3A schematically shows a cross section of the hot water storage tank 5, and FIG. 3B shows a temperature distribution of the hot water. Hot water temperature T
The region below 3a is a region where boiling is possible, and the region above Tu is a region that can be used as effective hot water. Areas not used as valid hot water has been an area between YuAtsushi T3 and Tu in the case of the conventional example shown in FIG. 12, the region between the YuAtsushi T3a and Tu is the case of this embodiment ( (Shaded area). That is, the region between the hot water temperatures T3 and T3a (the portion indicated by the hatched lines) is a region that has been made effective according to the present embodiment. Next, a description will be given of a case where there is a complete just before releasing boiling. FIG. 4 is a characteristic diagram showing an operation in the case where there is a release immediately before the completion of boiling. Similar to FIG. 2,
(A) the boiling detection state immediately before completion detecting means 12,
(B) shows the operating state of the compressor 1, (c) shows the valve opening of the pressure reducing device 3, (d) shows the discharge pressure, and (e) shows the feedwater temperature with respect to the operating time.

In the same manner as described above, when the feed water temperature detecting means 8 as the detecting means 12 immediately before the completion of the boiling detects the detected temperature Th immediately before the completion of the boiling, the first signal is outputted. together corresponding to one of the signal increases the valve opening of the decompressor 3 (open) state storage means 14
The fact that the immediately before the completion of boiling is detected by the detecting means 12 is stored. At this time, the discharge pressure is P
It decreases from 1 to P2. Then, the feed water temperature is further increased with the lapse of operating time, accordingly the discharge pressure increases. Thereafter, at the operation time t, when the hot water is discharged from the hot water storage tank 5 and the cold water flows into the hot water storage tank 5 from the water supply pipe 15, the water supply temperature detected by the water supply temperature detecting means 8 also decreases. Then, when the feed water temperature reaches the release temperature Tr immediately before the completion of boiling, the feed water temperature detecting means 8 outputs a second signal, and the control means 11 stores the contents of the state storage means 14 in response to the second signal. To detect.

At this time, if the state storage means 14 stores the fact that the state immediately before the completion of boiling is detected, the control means 1
1 decreases the valve opening of the pressure reducing device 3 (closes) and releases the storage of the state storage means 14. (If the state storage means 14 does not memorize the fact that it has detected immediately before the completion of boiling, the valve opening of the pressure reducing device 3 is not controlled.)

Thereafter, as the operation time elapses, the feed water temperature further rises, and when the feed water temperature detecting means 8, which is the detecting means 12 immediately before the completion of the boiling, detects the detected temperature Th immediately before the completion of the boiling again, the control means 11 returns to FIG. Again, the valve opening of the pressure reducing device 3 is increased again, and the state storage means 14 stores the fact that the immediately before the completion of boiling has been detected by the detection means 12 just before the completion of the boiling. Thereafter, as the operation time elapses, the feedwater temperature further rises, and the discharge pressure rises accordingly. Then, the feed water temperature detecting means 8 detects a water temperature T3a corresponding to regular upper limit pressure, to stop the compressor, and terminates the hot water heating operation.

As described above, according to the present embodiment, the means 12 for detecting immediately before the completion of boiling of the entire hot water storage tank 5 and the boiling means for canceling the detection of immediately before the entirety of the hot water storage tank 5 is heated. When the immediately before completion releasing means 13 and the immediately before boiling completion detecting means 12 detect a predetermined detected temperature Th immediately before completion of boiling, the valve opening of the pressure reducing device 3 is opened, and thereafter the immediately before completion of boiling completion releasing means 13 becomes a predetermined The control means 11 for controlling the valve opening of the pressure reducing device 3 to close when the release temperature Tr immediately before the completion of the boiling is detected is provided, so that the completion of the boiling is approached and the discharge pressure of the compressor 1 increases. In such a case, the discharge pressure is controlled to be low by controlling the opening degree of the valve of the pressure reducing device 3 to be open, the hot water supply heating operation can be performed up to a high supply water temperature, and the hot water capacity of the hot water storage tank 5 can be effectively used. That. Further, when the temperature of the water supply becomes low after the hot water supply, the valve opening of the pressure reducing device 3 is controlled to be closed, so that the hot water supply heating operation can be performed efficiently.

Embodiment 2 Hereinafter, a heat pump water heater according to Embodiment 2 of the present invention will be described with reference to the drawings.

FIG. 5 is a block diagram showing the configuration of this embodiment. The same components as those in the first embodiment are denoted by the same reference numerals, and a detailed description thereof will be omitted.

[0033] This example is Example 1 differs, as immediately before completion releasing means 13 raised immediately before the completion detecting means 12 and boiling boiling, further comprising: a discharge pressure detection means 16 for detecting a delivery pressure of the compressor 1 It is.

The operation and operation of the above configuration will be described. FIG. 6 is a characteristic diagram illustrating the operation of the present embodiment. In FIG. 6, (a) is a detection state of the detection means 12 immediately before the completion of boiling, (b) is an operation state of the compressor 1, (c) is a valve opening of the pressure reducing device 3, (d) is a discharge pressure, Each is shown corresponding to the operation time.

When the boiling of the hot water storage tank 5 is nearly completed, as described in the first embodiment, when the water flowing into the refrigerant / water heat exchanger 2 becomes a part of the hot water mixture layer, the supply water temperature rises with the operation time. Accordingly, as shown in (d), the discharge pressure also increases. Then, when the discharge pressure detecting means 16 as the detecting means 12 immediately before the completion of the boiling detects the detected pressure Ph immediately before the completion of the boiling, a first signal is output, and the control means 11 reduces the pressure in response to the first signal. The valve opening of the device 3 is increased (opened), and the state storage unit 1 is opened.
4, the fact that the immediately before the completion of boiling is detected by the detecting means 12 is stored. At this time, the discharge pressure decreases. Then, as the operation time elapses, the feedwater temperature further rises, and the discharge pressure rises accordingly.

[0036] Thereafter, the operation time t, when the cold water is tapped from the hot water storage tank 5 flows into the hot water storage tank 5 from the water supply pipe 15, the discharge pressure of the discharge pressure detecting means 16 detects also decreases. Then, when the discharge pressure reaches the release pressure Pr immediately before the completion of boiling, the discharge pressure detecting means 16 outputs a second signal. The control means 11 detects the contents stored in the state storage means 14 in response to the second signal.

At this time, if the state storage means 14 stores the fact that it has detected immediately before the completion of boiling,
And closes the valve opening of the state storage means 14 in which the immediately before boiling completion detecting means 12 detects immediately before the completion of boiling. (If no remember that it has detected a previous state storage unit 14 is boiling completed, control of the valve opening of the pressure reducing device 3 is not performed).

Thereafter, the discharge pressure increases as the feed water temperature further increases as the operation time elapses. When the discharge pressure detecting means 16 as the detecting means 12 immediately before the completion of the boiling again detects the detected pressure Ph immediately before the completion of the boiling, the control means 11 outputs the first signal again. The opening degree is increased, and the state storage means 14 stores that the immediately before boiling completion detecting means 12 has detected immediately before the completion of boiling. Thereafter, the feed water temperature is further increased with the lapse of operating time, also increases the discharge pressure accordingly. The discharge pressure detecting means 16 detects a common upper limit pressure P, to stop the compressor, and terminates the hot water heating operation.

As described above, according to the present embodiment, since the discharge pressure detecting means 16 is provided as the means for detecting immediately before the completion of boiling and the means for releasing immediately before the completion of boiling, the completion of the boiling is approached. when one of the discharge pressure increases, and controlled to open the valve opening of the decompressor 3 suppressing the discharge pressure, it is possible to hot-water supply heating operation to a high temperature of the feed water temperature, effective hot water capacity of the hot water storage tank 5 Can be used for If the water temperature is lowered in such the subsequent tapping, and controls so as to close the valve opening of the pressure reducing device 3, it is possible to good hot water heating operation efficiency. Further, since the pressure is directly controlled by the discharge pressure, the durability of the compressor 1 can be more reliably improved.

[0040] (Example 3) Hereinafter, Example 3 of the heat pump water heater of the present invention will be described with reference to the drawings.

FIG. 7 is a block diagram showing the configuration of this embodiment. The same components as those in the first embodiment are denoted by the same reference numerals, and a detailed description thereof will be omitted.

The present embodiment, differs from the first embodiment, as completed immediately before releasing means 13 boiling, the tapping detection unit 17 for detecting that it has tapped from the hot water tank 5 in that the tapping detection unit 17 has tapped That is, a timer 18 for measuring the detection time is provided. Hot water detecting means 17
In this embodiment, the flow detecting means 19 for detecting the presence or absence of the flow of the discharged hot water is used.

The operation and operation of the above configuration will be described. Figure 8 is a characteristic diagram showing the operation of this embodiment. In FIG. 8, (a) is a detection state of the detection means 12 immediately before the completion of boiling, (b) is presence or absence of hot water, (c) is a valve opening of the pressure reducing device 3, (d) is a discharge pressure, and (e) is a discharge pressure. The feedwater temperature is shown for each operation time.

[0044] At close complete boiling of the hot water storage tank 5, as described in Example 1, the water flowing into the refrigerant-water heat exchanger 2 becomes part of the hot and cold water mixing layer, the water supply temperature rises with operation time Accordingly, as shown in (d), the discharge pressure also increases. Then, upon detecting the completion just before the detected temperature Th boiling feed water temperature detecting means 8 is completed immediately before the detection means 12 boiling outputs a first signal, the control unit 11 increases the valve opening of the decompressor 3 (open)
At the same time, the state storage means 14 stores the fact that the immediately before boiling completion detecting means 12 has detected the time immediately before the completion of boiling. At this time, the discharge pressure decreases. Then, as the operation time elapses, the feedwater temperature further rises, and the discharge pressure rises accordingly.

Thereafter, when the hot water is supplied from the hot water storage tank 5 during the operation time t, the flow detecting means 19 as the hot water detecting means 17 detects the flow of the hot water, and the timer 18 measures the time during which the hot water is being supplied. . When the time measured by the timer 18 reaches a predetermined tapping time to, a second signal is output,
Control means 11 detects the contents stored in the condition storage means 14 in response to the second signal.

At this time, if the state storage means 14 stores the fact that it has detected immediately before the completion of boiling, the pressure reducing device 3
Is reduced (closed), and the storage in the state storage means 14 is released (if the contents of the state storage means 14 do not store the fact that immediately before the completion of boiling is detected, the pressure reducing device control of third valve opening degree is not performed).

[0047] As described above, according to this embodiment, provided with a feed water temperature detecting means 8 as immediately before the completion detecting means boiling,
By providing the flow detecting means 19 and the timer 18 as the releasing means immediately before the completion of the boiling, when the completion of the boiling is approached and the discharge pressure of the compressor 1 rises, the pressure reducing device 3 is used.
Since the discharge pressure is controlled to be low by opening the valve opening degree, the hot water supply heating operation can be performed up to a high supply water temperature, and the hot water capacity of the hot water storage tank 5 can be effectively used. Thereafter, when the timer 18 measures hot water supply for a predetermined time, the valve opening of the pressure reducing device 3 is controlled to be closed, so that an efficient hot water supply heating operation becomes possible. In addition, since the presence or absence of the flow of the hot water is directly detected and controlled, more reliable operation is possible.

Embodiment 4 Hereinafter, a heat pump water heater according to Embodiment 4 of the present invention will be described with reference to the drawings.

FIG. 9 is a block diagram showing the configuration of this embodiment. The same components as those of the third embodiment are denoted by the same reference numerals, and the detailed description is omitted.

The present embodiment is different from the third embodiment in that a tapping temperature detecting means 20 for detecting the temperature of the tapping water from the hot water tank 5 is provided as the tapping detecting means 17.

The operation and operation of the above configuration will be described. FIG. 10 is a characteristic diagram illustrating the operation of the present embodiment.
In FIG. 10, (a) shows the detection means 1 immediately before the completion of boiling.
2, (b) is a tapping temperature, (c) is a decompression device 3
, (D) shows the discharge pressure, and (e) shows the feedwater temperature, corresponding to the operation time.

When the boiling of the hot water storage tank 5 is nearly completed, as described in the third embodiment, when the water flowing into the refrigerant-to-water heat exchanger 2 becomes a portion of the hot water mixture layer, the water supply temperature rises with the operation time. Accordingly, as shown in (d), the discharge pressure also increases. Then, upon detecting the completion just before the detected temperature Th boiling feed water temperature detecting means 8 is completed immediately before the detection means 12 boiling outputs a first signal, the control unit 11, the vacuum in response to the first signal The valve opening of the device 3 is increased (opened), and the state storage unit 14 is opened.
Then, the fact that the immediately before the completion of boiling is detected by the detecting means 12 is stored. Then, as the operation time elapses, the feedwater temperature further rises, and the discharge pressure rises accordingly.

When the hot water is discharged from the hot water storage tank 5 during the operation time t, the hot water is detected by the hot water temperature detecting means 20, which is the hot water detecting means 17, by detecting a temperature higher than the hot water reference temperature To. Then, the timer 18 measures the time of tapping. The timer 18 outputs a second signal when the measured time reaches a predetermined tapping time to, and the control means 11 controls the state storage means 14 in response to the second signal.
To detect the stored contents.

At this time, if the state storage means 14 stores the fact that it has detected immediately before the completion of boiling,
Is reduced (closed) and the storage of the state storage means 14 is released. (If the contents of the state storage unit 14, if not stored the detection of the immediately preceding completion boiling, control of the valve opening of the pressure reducing device 3 is not performed).

[0055] As described above, according to this embodiment, provided with a feed water temperature detecting means 8 as immediately before the completion detecting means 12 boiling, a hot water temperature detector 20 and the timer 18 as a completed immediately before releasing means 13 boiling As a result, when the boiling is almost completed and the discharge pressure of the compressor 1 increases,
Controlled to open the valve opening of the pressure reducing device 3, the discharge pressure kept low, it is possible to hot-water supply heating operation to a high temperature of the feed water temperature, it can be effectively utilized hot water capacity of the hot water storage tank 5.
After that, when the hot water is detected for a predetermined time, the valve opening of the pressure reducing device 3 is controlled to be closed, so that an efficient hot water supply heating operation becomes possible. Further, since the control directly to the hot water temperature detection, it is possible to more certainty of certain operating.

[0056]

As described above, claims 1 to 4 are as described above.
According to the present invention, when the boiling is nearly completed and the discharge pressure of the compressor rises, the discharge pressure is controlled to be low by opening the valve opening of the pressure reducing device, and the hot water supply is heated to a high temperature of the feed water. Since the operation becomes possible, there is less wasteful area that cannot be used as effective hot water, and the hot water capacity of the hot water storage tank can be used effectively. Therefore, to satisfy a larger hot-water supply load as large as the hot water storage tank with a conventional, conversely, in order to satisfy the same size of the hot water supply load and the conventional so good in the hot water storage tank of a small prior art, the degree of freedom of installation It is large, and also to reduce costs. Further, an efficient hot water supply heating operation can be performed.
Thereafter, when the temperature of the water supply falls due to hot water supply or the like, the valve opening of the pressure reducing device is controlled to be closed, so that the hot water supply heating operation can be performed efficiently.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the configuration of a heat pump water heater according to a first embodiment of the present invention.

FIG. 2 is a characteristic diagram showing an operation of the embodiment when there is no cancellation immediately before the completion of boiling.

FIG. 3 is a characteristic diagram showing a temperature distribution of hot water in a hot water tank in the embodiment.

FIG. 4 is a characteristic diagram showing the operation of the embodiment when there is a release immediately before the completion of boiling.

FIG. 5 is a block diagram showing a configuration of a heat pump water heater according to a second embodiment of the present invention.

FIG. 6 is a characteristic diagram showing an operation of the embodiment.

FIG. 7 is a block diagram showing a configuration of a third embodiment of the heat pump water heater according to the present invention.

FIG. 8 is a characteristic diagram showing the operation of the embodiment.

9 is a block diagram showing a configuration of a fourth embodiment of the heat pump water heater of the present invention

FIG. 10 is a characteristic diagram showing the operation of the embodiment.

FIG. 11 is a block diagram showing a configuration of a conventional heat pump water heater.

FIG. 12 is a characteristic diagram showing a temperature distribution of hot water in a hot water tank in the conventional example.

FIG. 13 is a characteristic diagram showing a relationship between feed water temperature and discharge pressure in the conventional example.

[Explanation of symbols]

 1 compressor 2 refrigerant to water heat exchanger 3 decompressor 4 evaporator 5 hot water storage tank 6 circulating pump 7 supplemental heater 8 feedwater temperature detecting means 9 boiling temperature detecting means 10 flow control means 11 control means 12 boiling immediately before the completion detection Means 13 Release means immediately before boiling is completed 14 State storage means 15 Water supply pipe 16 Discharge pressure detection means 17 Hot water detection means 18 Timer 19 Flow detection means 20 Hot water temperature detection means P Regular upper limit pressure Th Detected temperature immediately before completion of boiling Tr Tr Completed boiling immediately before release temperature Ph boiling before completion detecting the pressure (first discharge pressure) Pr boiling before completion releasing pressure (second discharge pressure)

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Satoshi Matsumoto 1006 Kadoma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (4)

[Claims] 1. A refrigerant circuit in which a compressor, a refrigerant-to-water heat exchanger, a pressure reducing device for controlling the flow rate of a refrigerant, and an evaporator are sequentially connected, a hot water storage tank, a circulation pump, and the refrigerant-to-water heat exchange. A hot water supply circuit in which heat exchangers are sequentially connected, flow rate control means for controlling a flow rate of the circulation pump in order to keep a boiling temperature, which is a water-side outlet water temperature of the refrigerant-to-water heat exchanger, and the entire hot water storage tank When immediately before boiling is detected, when immediately before boiling is detected, when immediately before boiling is detected, when immediately before boiling is detected, the immediately before boiling is completely released. The valve opening of the pressure reducing device is opened by the first signal to be output, and is output when it is detected that the release means immediately before the completion of boiling is no longer just before the boiling in the state of valve opening by the first signal. Control means for controlling the valve opening of the pressure reducing device to be closed by a second signal to be applied. 2. A discharge pressure detecting means as a means for detecting immediately before the completion of boiling and a means for releasing immediately before the completion of boiling, wherein the discharge pressure detecting means detects a predetermined first discharge pressure corresponding to immediately before the boiling. 1 signal,
The heat pump water heater according to claim 1, wherein which is adapted to output a second signal upon detection of a predetermined second discharge pressure corresponding to when it is no longer just before boil up in the first signal by the valve open state. 3. As a means for releasing immediately before the completion of boiling, there are provided tapping detecting means for detecting that hot water has been discharged from the hot water storage tank, and a timer for measuring tapping time, wherein the timer is a first of the detecting means immediately before completion of boiling. When a predetermined tapping time that is not immediately before boiling when the valve is opened by a signal is measured and the second time is measured,
The heat pump water heater according to claim 1, wherein which is adapted to output a signal. 4. A hot water temperature detecting means for detecting the temperature of hot water from a hot water storage tank as the hot water detecting means.
The heat pump water heater as described.