JPS60238662A - Air-conditioning-hot-water supply heat pump 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 [Technical Field of the Invention] The present invention relates to a heat pump device for air conditioning/heating and hot water supply that is capable of air conditioning/heating and heating of water in a hot water storage tank.

[Prior art]

BACKGROUND ART Conventionally, there has been a heat pump device for cooling/heating as shown in FIG. 1, and a heat pump device for heating/cooling/hot water supply as shown in FIG. 2. The refrigerant circuit of the heat pump device shown in FIGS. 1 and 2 includes a compressor 1, a four-way valve 2 for switching between cooling and heating, an indoor heat exchanger 3, an expansion mechanism 4, and an outdoor heat exchanger 5. In the heat pump device shown in FIG. 1, an expansion mechanism 4 of a refrigerant circuit and an indoor heat exchanger 3 provided at the opening of a west valve 2 are connected to a four-way valve 21 via a solenoid valve 13. In addition, in the fjS2 diagram, 6 is a hot water tank, 8 is a hot water tank heating filter that heats the water in the hot water tank 6, and 1
4 is a city water intake port to the hot water storage tank 6, and 15 is a faucet for hot water supply. The heating coils 8 are provided in parallel, and are connected to the four-way valve 2 via respective electromagnetic valves 13.

Next, regarding the operation of the heat pump device shown in Figures 1 and 2-)
I will explain.

The bomb device shown in FIG. 1 is used to cool and heat a room. During cooling, high-temperature, high-pressure refrigerant gas discharged from the compressor 1 flows through the four-way valve 2 as shown by the solid arrow in the figure.
, reaches the outdoor heat exchanger 5, where it is cooled. I doubt it. The condensed high-pressure refrigerant liquid passes through one expansion valve 4a of the expansion mechanism 4, is depressurized, and flows into the indoor heat exchanger 3 as a refrigerant.

The low-pressure refrigerant liquid whose pressure has been reduced by the expansion valve 4a is evaporated in the indoor heat exchanger 3, removes heat from the room, and is gasified. This low-pressure refrigerant gas is sucked into the compressor 1 through the four-way valve 2, and the same cycle is repeated thereafter. During heating, high-temperature, high-pressure refrigerant gas discharged from the compressor 1 flows as indicated by the broken line arrow in the figure and reaches the four-way valve 2 and the indoor heat exchanger 3, where it radiates heat and condenses to perform heating. The high-pressure refrigerant liquid that has been condensed is depressurized through the other expansion valve 4b of the expander WI4. The depressurized refrigerant liquid reaches the outdoor heat exchanger 5, where it is heated by the outside air and evaporates. This low-pressure refrigerant gas passes through the four-way valve 2 and is sucked into the compressor 1, where the pressure is I4?
4, and the cycle is repeated thereafter.

In the heat pump device shown in Fig. 2, a part of the indoor heat exchanger is replaced with a hot water storage tank heating coil 8, and when heating hot water, the solenoid valve 13 on the indoor heat exchanger 3 side is opened, the four-way valve 2 is set to the heating side, and During heating and cooling, the solenoid valve 13 on the indoor heat exchanger 3 side is opened, and the solenoid valve 13 on the heating coil 8 side is closed. Note that the operations of the heat pump device shown in FIG. 2 other than those described above are the same as those of the heat pump device shown in FIG. 1.

However, in order to heat the water in the hot water tank 6 with the conventional heat pump device shown in FIG. 6
Since the operation heats the water inside the hot water tank 16, it is not possible to recover the waste heat from cooling to heat the water inside the hot water storage container 16, and the same refrigerant is used for heating and cooling and hot water supply. Therefore, when heating water, there is a problem that the upper limit is about 55 to 60°C.

[Summary of the invention]

This invention attempts to solve the problems of the conventional ones as described above, and the discharge side of the compressor of the first refrigerant circuit is branched via a first switching valve such as a three-way valve, and one One branch is connected to a four-way valve, and high-temperature, high-pressure refrigerant is guided from the other branch to the hot water tank heating coil to heat the inside of the hot water tank and the water, and the refrigerant condensed by this heating is passed through the second switching valve to each By connecting the piping on the four-way valve side of the indoor and outdoor heat exchangers together and allowing the refrigerant to flow selectively according to each operation mode of air conditioning, heating, and hot water supply, it is possible to simultaneously perform air conditioning, heating, and hot water supply, and to reduce waste during cooling. The heat can be recovered to heat the water in the hot water storage tank, and by operating a second refrigerant circuit in addition to or independently of this operation, an economically efficient hot water tapping system can be obtained. The aim is to provide a heat pump device for heating, cooling, and hot water supply.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIG.

In Fig. 3, 1 is a compressor, 2 is a four-way valve for switching between air conditioning and heating, 3 is an indoor heat exchanger, 4 is an expansion lamp, and 5 is an outdoor heat exchanger, which are the conventional ones shown in Fig. 1. Similar to that of t
It is provided in the refrigerant circuit 21 of tSl. 6 is a hot water tank;
7 is a first three-way valve for refrigerant switching. First three-way valve 7
An inlet lower a is provided on the discharge side of the compressor 1 of the first refrigerant circuit 21, one branch 7b is connected to the four-way valve 2, and the other branch 7c is inserted into the hot water tank 6 via piping 10 to heat the hot water storage tank. It is connected to coil 8. The outlet 1 of this heating coil 8 is connected to the inlet 9a of a second three-way valve 9 for refrigerant switching, and one branch 1)l] of the second three-way valve 4) is connected to the indoor heat exchanger valve 2. The other branch 9c is connected to the first refrigerant circuit 21 between the four-way valve 2 and the outdoor heat exchanger 5. 12 is an inverter for controlling the capacity of the compressor 1 of the first refrigerant circuit 21; 14 is a city water intake that communicates with the lower end of the hot water storage WI 6; and 15 is a hot water outlet pipe 22 that communicates with the upper end of the hot water storage tank 6. 16 is the faucet installed in the first. This is a control device for controlling the three-way valves 7 and 9 and the four-way valve 2 of tJS2.

Furthermore, 23 is a second refrigerant circuit independent of the first refrigerant circuit 21, and the second refrigerant circuit 23 is provided with a compressor 17, a condenser 18, an expansion mechanism 19, and an evaporator 20. The evaporator 20 of the second refrigerant circuit 23 is located at approximately the same height as the heating coil 8 in the hot water storage tank 6, and the condenser 18 is located at the same level as the heating coil 8 in the hot water storage tank 6. #
They are each installed at a position higher than the evaporator 20 in the J'WJG and below the water surface.

Next, the operation of the heat pump device of this embodiment will be explained.

Since the input core a of the three-way valve 7 of the tISi is connected to the branch 7b, the refrigerant gas discharged from the branch 7b passes through the broken line of the four-way valve 2 and flows as shown by the broken line arrow in Fig. 3. It reaches the indoor heat exchanger 3, where it condenses and becomes a refrigerant liquid.
It passes through the expansion mechanism 4, is evaporated in the outdoor heat exchanger 5, and returns to the compressor 1 via the broken line of the four-way valve 2.

During hot water supply for heating, part of the refrigerant gas discharged from the compressor 1 flows through the first three-way valve 7 as in the case of double heating, and the other part flows through the first three-way valve 7. Since the inlet lower a of the valve 7 is also connected to the branch 7c, hot water passes from the branch 7c through the pipe 10 and is stored in the heating coil 8 [6]. , the other part may be in a gaseous state without being condensed, and such refrigerant passes through the pipe 11, and the inlet 9a of the second three-way valve 9 is connected to the branch 9b, so that the indoor heat is It passes through the exchanger 3 and joins with the refrigerant liquid in the first refrigerant circuit 21, and thereafter flows in the same manner as during heating.

In the same way as N, connect the inlet lower a and the branch 7b to the inlet lower valve 7, and connect the indoor temperature sensor such as a thermostat (not shown). ), when the room temperature rises above the set value, the first three-way valve 7 is switched to connect the inlet lower a and the branch 7c, the heating is stopped, and the water in the storage 2416 is heated by the heating coil 8,
When the room temperature falls below a set value, heating of the water in the hot water storage tank 6 may be stopped and the heating mode may be returned to a selective operation between heating and hot water supply heating. Furthermore, the first three-way valve 7 may be switched to the connection between the inlet lower a and the branch 7b and the inlet lower a and the branch 7c at short intervals using a timer or the like, and the refrigerant may be distributed in a time-divided manner to space heating and hot water supply. .

During cooling, the cold 1fLU's discharged from the compressor 1 is
Since the input 1:l]7a of the first three-way valve 7 and the minute yJ17b are connected, it flows through the solid line of the four-way valve 2 as shown by the solid arrow in FIG. 3 and into the outdoor heat exchanger 5. There, it condenses and becomes a refrigerant liquid, passes through the expansion mechanism 4 and reaches the indoor heat exchanger 3, where it evaporates and becomes refrigerant gas, and the four-way valve 2
It returns to the compressor 1 via the solid line.

During hot water supply for cooling, the refrigerant discharged from the compressor 1 is guided to the heating coil 8 because the inlet lower a of the first three-way valve 7 and the branch 7c are connected, and the water in the hot water storage tank 6 is guided here. The refrigerant is heated so that some or all of the refrigerant is condensed, passes through the inlet 9a of the second three-way valve 9 and the other branch 9c from the pipe 11, and is liquefied in the outdoor heat exchanger 5, where it passes through the expansion mechanism 4. It reaches the indoor heat exchanger 3, where it evaporates and becomes a refrigerant gas, and returns to the compression 8!11 via the solid line of the four-way valve 2. In this case, the blower of the outdoor heat exchanger 5 can be operated more effectively if the heat exchanger capacity is adjusted by stopping or changing the rotation speed depending on the liquefaction state of the inflowing refrigerant. In this way, conventionally, all the refrigerant condensation heat was wasted from the outdoor heat exchanger 5 during cooling, but by forming the refrigerant flow as described above, the waste heat during cooling is transferred to the hot water storage tank. The water is effectively recovered as a heating source.

When heating hot water, the refrigerant passes through the heating coil 8, where the water in the hot water storage tank 6 is heated and partially or After all of the refrigerant is condensed, the connection route for the second three-way valve 9 can be selected depending on the condensation state of the refrigerant and the outside temperature. When the temperature is high, the route for cooling and hot water supply can be followed. For example, when the outside temperature is low, one branch 91) of the second three-way valve passes through the indoor heat exchanger 3, follows the expander vJ4, and reaches the outdoor heat exchanger 5, where it evaporates and the refrigerant gas and returns to the compressor 1 via the broken line of the four-way valve 2.

At the time of hot water supply temperature, - during each mode operation of the first refrigerant circuit 21 described above, the second refrigerant circuit 2 is operated in a superimposed manner or independently.
When the compressor 17 of No. 3 is driven, the high-temperature refrigerant gas discharged from the compressor 17 is condensed in the condenser 1-5, heats the water in the upper part of the hot water storage tank 6, and expands (reaches the water tank 19). Here, the pressure is reduced, and the evaporator 20 absorbs heat from the water in the lower part of the hot water storage tank 6 and evaporates it. refrigerant circuit 21
Seal in cold water. 17 and high iI! f t, (
In the refrigerant circuit 21 of boat 1, the pressure of L is ÷ R-2.
2, f: By using R-12 or the like in the refrigerant circuit 23 of tS2, the water in the upper part of the hot water storage tank 6 can be heated to a higher temperature than the temperature heated by the heating filter 8.

Conventionally, the warming operation by the second refrigerant circuit 23 described above is
Compared to the case where the electric heater is installed near the condenser 18 (=1), it is possible to perform heat pump operation with a relatively small temperature difference by transferring heat from the water in the lower part of the hot water tank 6 to the second part. Therefore, when a relatively small amount of refrigerant is used at a high temperature, it is possible to effectively heat the water with a small amount of electric kick.Furthermore, when the water temperature in the first part of the hot water storage tank 6 becomes low, the first refrigerant Since the condensing temperature of the refrigerant flowing through the heating coil 8 of the circuit 21 can be kept low, the operating efficiency of the first refrigerant circuit 21 can also be increased.

FIG. 4 shows another embodiment of the invention. Reference numeral 24 in FIG. 4 is a heat exchanger provided in a part of the hot water outlet pipe 22 leading from the hot water storage tank 6 to the faucet 15, and the condenser 18 of the second refrigerant circuit 23 is provided within this heat exchanger 24. There is. Then, the hot water passing through the hot water piping 22 is T! , : 1tlli tj
In cases 1 and 2, the temperature is raised by the high-temperature refrigerant discharged from Sentence 17, and the operation is similar to that of the second refrigerant circuit 2:3 in the embodiment shown in FIG. However, due to the refrigerant condensed in the condenser 18, the 1° 1 ↓ distribution', 1' 2
Since the hot water in 2 is directly heated, it is possible to more effectively moisten the water from 11 to 5 hours.

What, FIG.
The operation is similar to the embodiment shown in FIG.

1. In both of the embodiments described above, heating, heating hot water supply, cooling,
The cooling hot water supply and hot water heating operations are performed by controlling the first 7-way valve 7, the second 3-way valve 9, and the 4-way valve 2 by the control device 1G. The compressor 1 performs compression by an inverter 12 (capacity control is performed by changing the frequency of the drive power source 1).Furthermore, the second refrigerant circuit 23 detects the temperature at the upper part of the hot water tank 6 using an appropriate detector. It is preferable to operate when the detected temperature is below a predetermined value.

In addition, in the above-mentioned embodiment, the number of indoor heat exchangers 3 is one, but in the present invention, the number of indoor heat exchangers may be two or more. In the embodiment, the first switching valve is the fjSl three-way valve 7, but in this invention, two two-way valves may perform the same operation as the @1 switching valve, and the first three-way valve Like @1
The switching valve may be an electric valve that can adjust the flow rate. In this invention, the expansion mechanism 4 is a reversible electrically driven expansion valve whose opening degree can be adjusted according to the refrigerant flow rate, and the refrigerant inflow direction can be either left or right in Fig. 53 and Fig. 4. Using this will allow for even more effective operation.

In the embodiments described above, the indoor and outdoor heat exchangers are air type, but the present invention can also be used for water type indoor and outdoor heat exchangers. In the embodiment, the capacity of the compressor is controlled by an inverter, but in this invention, the compressor is divided into a plurality of units, and only the necessary number is operated by a control device.
It may also be possible to perform control.

〔Effect of the invention〕

As explained above, in a heat pump device for heating, cooling, and hot water supply, the present invention branches the compressor discharge side of the first refrigerant circuit via a @1 switching valve such as a first three-way valve, and this tjSl One branch from the first switching valve is connected to the four-way valve, and one branch is connected to the other branch from the first switching valve via the hot water tank heating coil and the second switching valve. The indoor heat exchanger and the four-way valve are connected to the piping that connects them, and the other branch of the second switching valve is connected to the outdoor heat exchanger and the four-way valve to the piping that connects the 1111I. It is economical because it can be done at the same time, and the water in the hot water tank can be heated with waste heat during cooling.
,! −Therefore, is the water or storage in the upper part of the hot water tank? Since the hot water in the hot water piping leading from &Jl to the faucet is heated, the temperature of the hot water can be raised efficiently and a high hot water temperature can be obtained.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing an example of a conventional heat pump device for air conditioning/heating/hot water supply, Fig. 2 is a block diagram showing the other side of the conventional heat pump device for heating/cooling/hot water supply, and Fig. 3 is a block diagram showing the other side of the conventional heat pump device for heating/cooling/hot water supply according to the present invention. FIG. 4 is a block diagram showing another embodiment of the heat pump device for cooling one room and hot water supply according to the present invention. DESCRIPTION OF SYMBOLS 1... Compressor, 2... Four-way valve, 3... Indoor heat exchanger, 4... Expansion mechanism, 5... Outdoor heat exchanger, 6...
・Saving? 8J tank, 7... First three-way valve (first switching valve), 8... Heating coil, 9... Three-way valve of fjS2 (
2nd switching valve), 12... Inverter, 15... Faucet, 16... Control device, 17... Compressor, 18...
・Condenser, 19... Expansion mechanism, 20... Evaporator, 2
1... First refrigerant circuit, 23... tPJ2 refrigerant circuit, 24... Heat exchanger. In addition, the same parts or corresponding parts in the figures are indicated by the same reference numerals. Agent Daikun HE Masu (and 2 others) Figure 1 Figure 2 b Procedures Amendment (voluntary)! ) 1, 'lpo 19 Showa November 11 1 Office Commissioner 1j Role Jf r'l display 'j-119 (l Showa 59-949
Name of the gate to No. 65 (Representative person who owns a heat pump device for heating, cooling, and hot water supply Jll Representative I: Katayama I: Hebe 5, Subject of amendment (1) Scope of claims column 6 of the specification, Contents of amendment ( 1) Amend the scope of claims in the specification as shown in the attached sheet. 7. Attached documents (1) Document stating the entire text of the amended scope of claims.
1i[] Document 2 stating the full text of the amended claims, Claims (1) Compressor, four-way valve for switching between air conditioning and heating, indoor heat exchanger,
A first refrigerant circuit has a reversible refrigerant flow expansion mechanism and an outdoor heat exchanger, the compressor discharge side of the first refrigerant circuit is branched via a first switching valve, and the first refrigerant circuit has a first switching valve. - A force branch is connected to the four-way valve, the other branch by the first switching valve is connected to the hot water storage tank heating coil, a second switching valve is connected to the outlet side of this heating coil, and the second switching valve is connected to the four-way valve. One branch of the second switching valve is connected to the pipe connecting the indoor heat exchanger and the four-way valve, and the other branch of the second switching valve is connected to the pipe connecting the outdoor heat exchanger and the four-way valve. A second refrigerant circuit is provided with a compressor, a condenser, an expansion mechanism, and an evaporator independent of the refrigerant circuit of λ, and the evaporator of the λ-th refrigerant circuit is located at approximately the same level as the heating coil of the hot water tank. A heat pump device for air conditioning and hot water supply, characterized in that the condenser of the second refrigerant circuit is installed below the water surface in the upper part of the hot water storage tank, higher than the evaporator, or in the hot water outlet piping from the hot water storage tank to the faucet. . (2) The heat pump device for air conditioning/heating/hot water supply according to claim 1, wherein the compressor of the first refrigerant circuit is configured to perform capacity control by an inverter that varies the frequency of its driving power source. (3) The compressor of the first refrigerant circuit is divided into a plurality of small-capacity compressors, and only the necessary number of compressors are operated by a control device j6 to control the capacity. Heat pump equipment for heating, cooling, and hot water supply. (4) During simultaneous operation of hot water heating, cooling, and hot water heating,
The first switching valve is connected to the other branch, and the second switching valve is connected to the other branch so that refrigerant circulates through the outdoor heat exchanger, expansion mechanism, indoor heat exchanger, and four-way valve to the compressor. A heat pump device for air conditioning and hot water supply according to claim tIS1. (5) During the heating/hot water heating selection operation, the ll'l switching valve is connected to one branch, and the refrigerant flows to the indoor heat exchanger through the four-way valve to perform heating, and the heating operation detects the indoor temperature. The air conditioning/heating system according to claim 1, wherein the first switching valve is connected to the other branch when the valve is at rest, and the refrigerant flows through the hot water storage tank heating coil to the indoor heat exchanger.
Heat pump equipment for hot water supply. ([)) During simultaneous heating and hot water heating operation, the first switching valve is connected to both branches, and the refrigerant flows to the indoor heat exchanger through the four-way valve, and the fIS flows through the hot water storage tank heating coil.
The heat pump device for air conditioning/heating and hot water supply according to claim 1, wherein the refrigerant flows from one branch of the second switching valve to the indoor heat exchanger. (7) During simultaneous heating and hot water heating operation, the first switching valve is switched and connected to both branches at short intervals, and the second switching valve is connected to one branch to supply cold water to the indoor heat exchanger. A heat pump device for heating, cooling, and hot water supply according to claim 1, which alternately performs heating and hot water supply by causing water to flow. The refrigerant circuit of ff12 detects the temperature of the second part of the hot water storage tank or the hot water outlet temperature, and when the detected temperature is at a predetermined value, the refrigerant circuit operates in addition to or independently of the operation of the first refrigerant circuit.
The heat pump device for cooling/heating/hot water supply according to claim 1, which is configured to be in operation during hot water heating, simultaneous cooling/hot water heating operation, heating/hot water heating selection operation, and simultaneous heating/hot water heating operation.

Claims (8)

[Claims] (1) Compressor, four-way valve for switching between air conditioning and heating, indoor heat exchanger,
It is equipped with a ptSl refrigerant circuit having a refrigerant reversible flow type expansion mechanism and an outdoor heat exchanger, and the compressor discharge side of the fjSl refrigerant circuit is branched via a first switching valve. connecting the branch to the four-way valve, and connecting the other branch by the first switching valve to the hot water tank heating coil,
A second switching valve is connected to the 7Jjrl side of this heating coil, and the 11j part of the second switching valve is connected to the pipe connecting the indoor heat exchanger and the four-way valve, and the other side of the second switching valve Connect the branch to the pipe connecting the outdoor heat exchanger and the four-way valve, and install a second refrigerant circuit that is independent of the first refrigerant circuit and has a compressor, condenser, expansion mechanism, and evaporator. , the evaporator of the first refrigerant circuit is connected to the heating filter of the hot water storage tank and iJ
Is it placed at the same height and stores the condensed water from the first refrigerant circuit?
Heat pump device for heating, cooling, and hot water supply, characterized by being installed in a high position or in the hot water piping leading from the hot water storage tank to the faucet. (2) The compressor of the first refrigerant circuit is configured to control its capacity by an inverter that varies the frequency of its driving power source. heat pump equipment. (3) The compressor of the first refrigerant circuit is divided into a plurality of small-capacity compressors, and only the necessary number of compressors are operated by a control device to control the capacity. Heat pump equipment for heating, cooling, and hot water supply. (4) During simultaneous operation of hot water heating, cooling, and hot water heating,
The first switching valve is connected to the other branch, and the switching valve of ptS2 is connected to the other branch so that the refrigerant circulates through the outdoor heat exchanger, expansion mechanism, indoor heat exchanger, and four-way valve to the compressor. A heat pump device for air conditioning and hot water supply according to claim 1. (5) During the heating/hot water supply heating selection operation, the first switching valve is connected to one branch, and the refrigerant flows through the four-way valve to the indoor heat exchanger to perform heating, and the heating operation is performed when the indoor temperature detector The first switching valve is connected to the other branch while the system is at rest, so that the refrigerant flows through the hot water storage tank heating coil to the indoor heat exchanger. heat pump equipment. (6) During simultaneous heating and hot water heating operation, the switching valve t51 is connected to both branches, and the refrigerant flows to the indoor heat exchanger via the four-way valve, and at the same time, the refrigerant flows through the hot water storage tank heating fill to the second switching valve. The heat pump device for air conditioning and hot water supply according to claim 1, wherein the refrigerant flows from one branch to the indoor heat exchanger. (7) During simultaneous heating and hot water heating operation, the first switching valve switches and connects to the sub-branch at short intervals, the second switching valve connects to one branch, and the refrigerant flows to the indoor heat exchanger. The heat pump device for air conditioning/heating and hot water supply according to claim 1, which alternately performs heating and hot water supply in this manner. (8) The second refrigerant circuit detects the temperature in the upper part of the hot water storage tank or the hot water outlet temperature, and when the detected temperature is below a predetermined value, the second refrigerant circuit performs hot water heating, in addition to or independently of the operation of the first refrigerant circuit.
The heat pump device for air conditioning/heating/hot water supply according to claim 1, which is operated during simultaneous cooling/hot water heating operation, heating/hot water heating selection operation, and simultaneous heating/hot water heating operation.