JPS6273047A - Refrigerator with hot-water supply device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a refrigerator with a water heater, and more particularly to a refrigerator with a water heater that can perform cooling, heating, and hot water supply operations in one refrigeration cycle system.

[Background of the invention]

Figure 3 shows a refrigeration cycle system diagram of a conventional refrigerator with water heater, in which 1 is a compressor, 2 is a west valve, 3 is a heat exchanger on the heat source side,
4 is a user side heat exchanger, 5 is a hot water supply heat exchanger, 6 is a cooling pressure reducing device, 7 is a heating and hot water supply pressure reducing device, 8 and 9 are check valves, 10 and 11 are strainers, and 1 is a melt plug,
13 is an accumulator, 14 is a suction pressure regulating valve, and these devices are connected by piping as shown in the figure to constitute a refrigeration cycle. 15 is a blower of the heat source side heat exchanger 3;
6 is a 7 uncoil unit, 17 is a user-side cold/hot water pump, 18 is a hot water storage tank, and 19 is a hot water supply pump.

In this refrigerator, during cooling operation, the refrigerant discharged from the compressor 1 is transferred from the hot water supply heat exchanger 5 to the four-way valve 2 to the heat source side heat exchanger 3 to the reversal valve 9 to the strainer 10 to the cooling pressure reducing device 6 to The water is circulated in the order of the fuser plug 12 - the user heat exchanger 4 - the four-way valve 2 - the accumulator 13 - the suction pressure regulating valve 14 - the compressor 1, and the cold/hot water pump 17 is used to circulate the water between the user side heat exchanger 4 and the fan coil unit 16. Circulate the water to cool it. In addition, during heating operation, the refrigerant discharged from the compressor 1 is transferred from the hot water supply heat exchanger 5 to the four-way valve 2 to the user side heat exchanger 4 to the fusible plug 1.
2 - check valve 8 - strainer 11 - pressure reducing device for heating and hot water supply 7 - heat source side heat exchanger 3 - four-way valve 2 - accumulator 13 - suction pressure regulating valve 14 - compressor 1 by circulating cold and hot water in this order. The pump 17 heats the circulating water.

Furthermore, during hot water supply operation, the hot water supply pump 19 is operated and the blower 15 is stopped. As a result, the high-temperature, high-pressure gas refrigerant discharged from the compressor 1 enters the hot water supply heat exchanger 5, heats the hot water supply, condenses itself, and enters the user-side heat exchanger 4 via the four-way valve 2. At this time, since the cold/hot water pump 17 is stopped, the high temperature and high pressure liquid refrigerant flows through the fuser plug 12. After passing through the check valve 8 and the strainer 11, the pressure is reduced by the pressure reducing device 7 for heating and hot water supply, and the water enters the heat source side heat exchanger 3.

Here, the heat is taken from the outside air, evaporated, and returned to the compressor 1 through the four-way valve 2, the accumulator 13, and the suction pressure regulating valve 14.

By the way, in the hot water supply operation described above, when the outside air temperature is low as in winter, frost forms on the heat source side heat exchanger 3, which acts as an evaporator, so defrosting is required.

However, in the above-mentioned refrigerator, the water heater is located on the differential pressure side and defrosting heat cannot be collected from the water heater, so if frost forms on the heat source side heat exchanger 3, the hot water supply pump 19 is stopped. In addition, while operating the cold/hot water pump 17, the cycle is switched to a reverse cycle so that heat is absorbed from the hot water on the user side to defrost the water. For this reason, if the temperature of the hot water on the user side is not high enough, there is a risk of freezing, so a large hot water tank or heat storage tank is required to keep the hot water constantly warmed. Also, regarding the installation of this hot water tank or heat storage tank, although it can be used in refrigerators that produce cold water and hot water such as chiller units, it is necessary to install a heat exchanger 4 on the user side such as in package refrigerators and room air conditioners. When installed indoors, heat storage is impossible and it cannot be used. Furthermore, in the defrosting method described above, complicated controls such as stopping the hot water pump 19 and operating the cold/hot water pump 17 must be performed during defrosting.

Regarding this type of refrigerator with a water heater, there is a heat collector chiller unit described in branch number 85-4380 of the Technical Report published by Japan Institute of Invention and Innovation.

[Purpose of the invention]

An object of the present invention is to enable defrosting heat to be obtained from the hot water supply side during hot water supply operation, to ensure defrosting without requiring a large hot water tank or heat storage tank, and to reduce the complexity of the pump during defrosting. An object of the present invention is to provide a refrigerator with a water heater that does not require extensive control.

[Summary of the invention]

The refrigerator with water heater of the present invention includes a compressor, a four-way valve, a three-way valve,
Equipped with a hot water supply heat exchanger, a user side heat exchanger, a pressure reducing device, a heat source side heat exchanger, an accumulator, a suction pressure adjustment valve, multiple check valves, etc. By connecting and arranging the heat exchangers in parallel and branching the upstream sides of both heat exchangers using the three-way valve, when the refrigerant flows into one heat exchanger, the refrigerant flows into the other heat exchanger. During cooling operation, the refrigerant discharged from the compressor is
Four-way valve ~ Heat source side heat exchanger ~ Pressure reducing device ~ User side heat exchanger ~
The refrigeration cycle consists of a three-way valve, a west valve, an accumulator, a suction pressure regulating valve, and a compressor. During heating operation, the refrigerant discharged from the compressor flows through the four-way valve, the three-way valve, and the compressor.
Usage side heat exchanger - pressure reducing device ~ heat source side heat exchanger - four-way valve ~
A refrigeration cycle is constructed in which the refrigerant circulates in the order from the accumulator suction pressure regulating valve to the compressor, and during hot water supply operation, the refrigerant discharged from the compressor is transferred from the four-way valve to the three-way valve to the hot water supply heat exchanger to the pressure reducing device to the heat source side heat exchanger. By configuring a refrigeration cycle that circulates in the order of water heater, four-way valve, accumulator, suction pressure regulating valve, and compressor, defrosting can be performed without the need for a hot water tank or heat storage tank during hot water supply operation in winter, and the cold temperature This eliminates the need for complex controls such as starting and stopping water pumps and hot water pumps.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be explained with reference to FIG. The figure shows a refrigeration cycle system diagram of a refrigerator with a water heater according to the present invention, where 21 is a compressor, 22 is a four-way valve, 23 is a heat source side heat exchanger, 24 is a user side heat exchanger, and 25 is a hot water supply heat exchanger. vessel, 2
6 is a pressure reducing device for cooling, n is a pressure reducing device for heating and hot water supply, 28 and 4 are check valves, 30 and 31 are strainers, 32 is a fuser plug, the vane is an accumulator, 34 is a suction pressure regulating valve, and A is a three-way These devices are connected via piping as shown in the figure to form a refrigeration cycle that can perform cooling, heating, and hot water supply operations. To explain clearly, the user side heat exchanger 24 and the hot water supply heat exchanger 25 are connected and arranged in parallel,
And the upstream sides of both heat exchangers are branched with a three-way valve,
The structure is such that when refrigerant flows through one heat exchanger, refrigerant does not flow through the other heat exchanger.

During cooling operation, the refrigerant discharged from the compressor 21 flows from the four-way valve 22 to the heat source side heat exchanger 23 to the check valve 29 to
A refrigeration cycle is constituted by circulating in the order of strainer heating, cooling pressure reducing device 26, fusible plug 32, utilization side heat exchanger 24, three-way valve, accumulator blade, suction pressure regulating valve, and compressor 21. In addition, during heating operation, the refrigerant discharged from the compressor 21 flows between the four-way valve 22 to the three-way valve 24 to the user-side heat exchanger 24.
- Fuse plug 32 - Check valve 28 - Strainer 31 - Heating and hot water supply pressure reducing device 27 - Heat source side heat exchanger 23 - Four-way valve 2
2 ~ Accumulator ~ Suction pressure regulating valve ~ Compressor 21
A refrigeration cycle is constructed that circulates in this order. In addition, during hot water supply operation, the refrigerant discharged from the compressor 21 flows through the four-way valve 22.
~ Mikata Bentei ~ Hot water heat exchanger 25 ~ Fusible plug 32 ~ Check valve 2
8 ~ Strainer 31 ~ Heating and hot water supply pressure reducing device n ~
Heat source side heat exchanger 23 ~ four-way valve 22 ~ accumulator blade ~
A refrigeration cycle is configured in which the suction pressure regulating valve 34 and the compressor 21 circulate in this order.

36 is the blower of the heat exchanger on the heat source side, 37 is the fan coil unit, Yari is the cold/hot water pump on the user side, 39 is the hot water storage tank,
40 is a hot water supply pump.

Next, the operation of this embodiment will be explained.

During cooling operation, the refrigerant discharged from the compressor 21 passes through the four-way valve 22 and enters the heat source side heat exchanger 23, where it is condensed and liquefied. The liquid refrigerant has a check valve device and a strainer 30
The water is then depressurized by the cooling decompression device 26, passes through the fusible plug 32, enters the user-side heat exchanger 24, and is cooled by the cold/hot water pump as it circulates between the heat exchanger 24 and the fan coil unit 37. However, it evaporates and becomes a gas. The gas refrigerant returns to the compressor 21 through the three-way valve section, the four-way valve 22, the accumulator 33, and the suction pressure regulating valve.

Also, during heating operation, the four-way valve 22 is switched and the flow of refrigerant is reversed to that during cooling. That is, the refrigerant discharged from the compressor 21 passes through the four-way valve 22 and the three-way valve section and enters the user-side heat exchanger 24, where it warms the circulating water by the cold/hot water bong north and at the same time condenses itself. and liquefy. After the liquid refrigerant passes through the fuser plug 32, the check valve 28, and the strainer 31, it is depressurized by the heating and hot water supply pump [27] and enters the heat source side heat exchanger 23, where it absorbs heat from the outside air and evaporates itself. to gasify it. The gas refrigerant returns to the compressor 21 through the four-way valve 22, the accumulator blade, and the suction pressure regulating valve.

In this heating operation, if the outside air temperature is low and frost forms on the heat source side heat exchanger 23, the four-way valve 22 is switched to the opposite position and the blower 36 is stopped to perform a reverse cycle defrosting operation.

Further, during hot water supply operation, the four-way valve 22 is switched to the same position as during heating operation, and the three-way valve section is switched to the opposite position to that during heating operation. As a result, the refrigerant discharged from the compressor 21 passes through the four-way valve 22 and the three-way valve section and enters the hot water heat exchanger 25, where it heats the hot water fed by the hot water pump 40 and at the same time condenses itself. and liquefy. The heated hot water is stored in a hot water tank 39. After passing through the fuser plug 32, check valve 28, and strainer 31, the liquid refrigerant is depressurized by the heating chamber and hot water supply pressure reducing device, and then transferred to the heat source side heat exchanger 23.
It absorbs heat from the outside air and evaporates into gas. The gas refrigerant returns to the compressor 21 through the west valve 22, the accumulator, and the suction pressure regulating valve. During this hot water supply operation, if the outside air temperature is low and frost forms on the heat source side heat exchanger cover, the three-way valve 22 is left as is and only the four-way valve 22 is switched to the opposite position to perform reverse cycle defrosting operation. . In other words, the refrigerant discharged from the compressor 21 is transferred from the four-way valve 22 to
Heat source side heat exchanger - Check valve 9 - Strainer circle - Cooling pressure reducing device 26 - Fuse plug 32 - Hot water supply heat exchanger 25 - Three-way valve - Four-way valve 22 - Accumulator - Suction pressure adjustment discrimination -
By circulating the compressor 21 in this order, heat is absorbed from the hot water supply heat exchanger section and the heat source side heat exchanger section is defrosted.

As described above, in this embodiment, since the defrosting heat during hot water supply is obtained from the hot water supply side, defrosting can be reliably performed without requiring a large hot water tank or heat storage tank as in the conventional case. As a result, it can be applied not only to chiller units but also to packaged refrigerators and room air conditioners, allowing for a wide range of uses. Furthermore, since there is no need to start or stop the cold/hot water pump or hot water pump during defrosting, the control system is also extremely simple.

In addition to the above-mentioned effects, this embodiment also has the following advantages.

That is, since the user side heat exchanger 24 and the hot water supply heat exchanger 25 are connected in parallel, and the refrigerant is not allowed to flow into the unused heat exchanger, a large amount of refrigerant can be used. In other words, the amount of refrigerant charged in the refrigeration cycle can be reduced.

Moreover, since liquid refrigerant does not flow into the four-way valve 22 during cooling, heating, and hot water supply operations, malfunction of the four-way valve 22 does not occur.

FIG. 2 shows another embodiment of the present invention, which differs from FIG. 1 in that it is equipped with a liquid receiver 41 and that the cooling, heating, and hot water supply operations are performed by using one pressure reducing device string for υ refrigerant. The point is that the pressure is reduced. To explain in detail, during cooling operation, the refrigerant is transferred from the check valve 43 to the liquid receiver 41 to the strainer shrine to the solenoid valve 6.
The refrigerant is passed through the check valve 47, the receiver 41, the strainer 44, the solenoid valve C, the pressure reducer C, and the reverse valve 48 during heating and hot water supply operations. They are distributed in order.

In this embodiment as well, the same functions and effects as described above can be achieved.

C Effects of the Invention As explained above, according to the present invention, defrosting heat during hot water supply operation can be obtained from the hot water supply side, so defrosting can be performed without requiring a large hot water tank or heat storage tank. It is reliable and easy to control during defrosting.

[Brief explanation of drawings]

Fig. 1 is a refrigeration cycle system diagram showing one embodiment of the refrigerator with water heater of the present invention, Fig. 2 is a refrigeration cycle system diagram showing another embodiment of the invention, and Fig. 3 is a conventional refrigeration cycle system. It is a diagram. 21...Compressor, 22...Western valve, 23...Heat source side heat exchanger, 24...Usage side heat exchanger, section...Hot water supply heat exchanger, 26...For cooling Pressure reducing device, n... Pressure reducing device for heating and hot water supply [, 28, 29... Check valve, 3
3...accumulator, word...suction pressure regulating valve, ah...three-way valve, C...pressure reducing device%Xun. 46, 47.48...Check valve. Figure 2 113

Claims (1)

[Claims] Equipped with a compressor, four-way valve, three-way valve, heat exchanger for hot water supply, user side heat exchanger, pressure reduction device, heat source side heat exchanger, accumulator, suction pressure adjustment valve, multiple check valves, etc. By arranging the exchanger and the user-side heat exchanger in parallel, and branching off the upstream sides of both heat exchangers using the three-way valve, when the refrigerant flows into one heat exchanger, the refrigerant flows through the other heat exchanger. The heat exchanger is configured so that no refrigerant flows through it, and during cooling operation, the refrigerant discharged from the compressor flows through the four-way valve - the heat source side heat exchanger - the pressure reduction device - the user side heat exchanger - the three-way valve - the four-way valve - The refrigeration cycle consists of an accumulator, a suction pressure regulating valve, and a compressor, which circulate in this order. During heating operation, the refrigerant discharged from the compressor flows through a four-way valve, a three-way valve, a user-side heat exchanger, a pressure reducer, and a heat source-side heat exchanger. The refrigeration cycle consists of a refrigeration cycle that circulates in the order of: - four-way valve - accumulator - suction pressure regulating valve - compressor. During hot water supply operation, the refrigerant discharged from the compressor flows through the four-way valve - three-way valve - heat exchanger for hot water supply - pressure reducing device. A refrigerator with a water heater comprising a refrigeration cycle that circulates in the following order: - a heat source side heat exchanger - a four-way valve - a suction pressure regulating valve to an accumulator - a compressor.