JPS60235971A - 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 the refrigerant circuit and an indoor heat exchanger 3 provided at the opening of the four-way valve 2 are connected to the four-way valve 2 via a solenoid valve 13. Further, in FIG. 2, 6 is a hot water tank, 8 is a hot water tank heating coil that heats the water in the hot water tank 6, 14 is a city water intake to the hot water tank 6, 15 is a faucet for hot water supply, In the heat pump device shown in FIG. 2, an indoor heat exchanger 3 and the heating coil 8 are installed in parallel to the expansion mechanism 4 of the refrigerant circuit and the opening of the four-way valve 2, and these are connected to the four-way valve 2 through the respective electromagnetic valves 13. It is connected.

Next, the operation of the heat pump device shown in FIGS. 1 and 2 will be explained.

The heat pump device shown in FIG. 1 is for heating and cooling a room. During cooling, the high-temperature, high-pressure refrigerant discharged from the compressor 1 flows as shown by the solid arrow in the figure and reaches the four-way valve 2 and the outdoor heat exchanger 5, where it is cooled and condensed. 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. expansion valve 4
The low-pressure refrigerant liquid whose pressure has been reduced in step a 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 shown 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 condensed high-pressure refrigerant liquid passes through the other expansion valve 4b of the expansion mechanism 4 and is depressurized. 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 is transferred to the four-way valve 2
The air is sucked into the compressor 1 and compressed, and the same 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 closed and the solenoid valve 13 of the heating coil 8fIA is opened. , the four-way valve 2 is set to the heating side, and the solenoid valve 13 on the indoor heat exchanger 3 side is opened during heating and cooling.
Close the solenoid valve 13 on the heating coil 8 side. 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 water in the hot water tank 6 with the conventional heat pump device shown in FIG. 2, a heating coil 8 installed in parallel with the indoor heat exchanger 3 is inserted into the hot water tank 6, 6
Since the water in the hot water storage tank 6 is operated in a manner that heats the water in the tank, it is not possible to recover waste heat from cooling to heat the water in the hot water tank 6, and the same refrigerant is used for air conditioning 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, by branching the discharge side of the compressor via a switching valve such as a three-way valve, and connecting one branch to a four-way valve. High-temperature, high-pressure refrigerant is guided from the other branch to the hot water storage tank heating coil to heat the water in the hot water storage tank, and the refrigerant condensed by this heating is sent to the pipes on the four-way valve sides of the indoor and outdoor heat exchangers via solenoid valves. By connecting the refrigerant to the air conditioner and selectively flowing the refrigerant 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 recover waste heat from cooling to heat water in the hot water storage tank. The objective is to provide an economical 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 mechanism, and 5 is an outdoor heat exchanger, which are the conventional ones shown in Fig. 1. It is also provided in the refrigerant circuit.

6 is a hot water storage tank, and 7 is a three-way valve for switching refrigerant. Three-way valve 7
is provided with an inlet lower a on the compressed fil discharge side of the refrigerant circuit,
One branch 7b is connected to the four-way valve 2, and the other branch 7c
is connected to a hot water tank heating coil 8 inserted into the hot water tank 6 by a pipe 12. The pipe 12 branches off at the outlet side of the heating coil 8, and a pipe 16 branched from the branch part 11 is connected between the west valve 2 of the refrigerant circuit and the indoor heat exchanger 3 via one electromagnetic valve 9. . The pipe 17 branched from the branch part 11 is connected to the four-way valve 2 of the refrigerant circuit via the other solenoid valve 10.
and the outdoor heat exchanger 5.

18 is an inverter that controls the capacity of the compressor 1; 14 is a city water intake port that communicates with the lower end of the hot water storage tank 6; 15 is a faucet installed in the hot water outlet pipe that communicates with the upper end of the hot water tank 6; 19 is a three-way valve. 7 and solenoid valves 9 and 10.

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

Is the refrigerant circuit compressed during heating? Since the inlet lower a of the three-way valve 7 is connected to the branch 7b, the refrigerant gas discharged from the l11 flows from the branch 7b through the broken line of the four-way valve 2, as shown by the broken line arrow in Fig. 3, and enters the room. It reaches the heat exchanger 3, where it condenses to become a refrigerant liquid, passes through the expansion mechanism 4, evaporates in the outdoor heat exchanger 5, and passes through the broken line of the four-way valve 2 to be compressed ff11.
Return to

Compress when heating and hot water supply! A part of the refrigerant gas discharged from 911 flows by switching the three-way valve 7 in the same manner as during heating described above, and another part of the refrigerant gas flows through the inlet lower a of the three-way valve 7 which is also connected to the branch 7c. As a result, the water in the hot water storage tank 6 is heated by the heating coil 8 through the pipe 12 from the branch 7c, and part of it condenses and becomes a refrigerant liquid, but the other part does not condense and becomes a gas. In some cases, such refrigerant passes through the solenoid valve 9, passes through the indoor heat exchanger 3, joins with the refrigerant liquid in the refrigerant circuit, and thereafter flows in the same manner as during heating.

In addition, when heating hot water, the three-way valve 7 is connected to the inlet lower a and the branch 7b in the same way as when heating, and an indoor temperature sensor (not shown) such as a thermostat detects that the room temperature has risen above the set value. At times, the three-way valve 7 is switched to connect the inlet lower a and the branch 7C to stop heating, and the heating coil 8 heats the water in the hot water tank 6. When the room temperature falls below the set value, the water in the hot water tank 6 is turned off. stop heating the water and return it to heating,
In addition, a three-way valve 7 performs selective operation of heating and hot water heating.
The refrigerant may be allocated to heating and hot water in a time-divided manner by switching 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.

During cooling, the refrigerant discharged from the compressor 1 passes through the solid line of the four-way valve 2 and flows through the solid line of the four-way valve 2 because the inlet lower a and the branch 7b of the three-way valve 7 are connected and the solenoid valves 9 and 10 are closed. It flows as shown by the solid arrow in the figure and reaches the outdoor heat exchanger 5, where it condenses to become a refrigerant liquid, passes through the expansion mechanism 4 and reaches the indoor heat exchanger 3, where it evaporates and becomes a refrigerant gas. It returns to the compression a1 via the solid line of the four-way valve 2.

During cooling hot water supply, the refrigerant gas discharged from the compression a1 is connected to the inlet lower a of the three-way valve 7 and the branch 7c, so it is guided to the heating coil 8, where it heats the water in the hot water tank 6 and cools it. Part or all of the refrigerant is condensed, passes through the solenoid valve 10 from the piping 17, and is liquefied in the outdoor heat exchanger 5, expanding by 9 m.
4, it reaches the indoor heat exchanger 3, where it evaporates into refrigerant gas, and returns to the compression m1 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 stored 8'! The water in fI is effectively recovered as a heating source.

When heating hot water, the refrigerant gas passes through the heating coil 8 because the three-way valve 7 is connected to the inlet lower a and the branch 7c, where it heats the water in the hot water storage [6 and condenses some or all of it]. , then depending on the condensation state of the refrigerant and the outside temperature state,
The route can be selected, and when the outside temperature is low, the route for heating and hot water supply can be followed, and when the outside temperature is high, the route for cooling and hot water supply can be followed. For example, when the outside temperature is low, the solenoid valve 9 passes through the indoor heat exchanger 3, passes through the expansion mechanism 4, and reaches the outdoor heat exchanger 5, where it evaporates and becomes refrigerant gas. and return to compressor 1.

In the embodiment described above, the operation of heating, heating hot water supply, cooling, cooling hot water supply, and hot water supply heating is controlled by the control device 19.
Compression of the refrigerant circuit @1 is performed by controlling the three-way valve 7, solenoid valves 9, 10, and four-way valve 2. Capacity control is performed by changing the frequency of the drive power source for the compressor 1 with the inverter 18. Let's do it.

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 switching valve is the three-way valve 7, but this invention
Two two-way valves may be used as switching valves to perform the same operation.
Further, the switching valve such as a three-way valve may be an electrically operated valve capable of adjusting the flow rate. In this invention, the expansion mechanism 4 uses 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. More effective driving becomes possible. In the embodiments described above, the indoor and outdoor heat exchangers are of the air type, but the present invention can also be used for this type of indoor and outdoor heat exchangers. In the embodiment, the capacity of the compressor is controlled by an inverter, but in the present invention, the compressor may be divided into a plurality of units, and only the necessary number of units may be operated by a control device to perform capacity 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 refrigerant circuit through a switching valve such as a three-way valve, and one branch by the switching valve is converted into a four-way valve. At the same time, the other branch by the switching valve is further branched through the hot water tank heating coil, and connected to the piping connecting the indoor and outdoor heat exchangers and the four-way valve through one and the other solenoid valve, making it easy to operate. This system has the effect of providing an economical system, since air conditioning and heating and hot water supply can be performed at the same time using the pipes, and the waste heat from cooling is used to heat the water in the hot water storage tank.

[Brief explanation of the drawing]

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. 1 is a configuration diagram showing an example of a heat pump device. DESCRIPTION OF SYMBOLS 1... Compressor, 2... Four-way valve, 3... Indoor heat exchanger, 4... Expansion mechanism, 5... Outdoor heat exchanger, 6...
・Hot water tank, 7... Three-way valve (switching valve), 8... Heating coil, 9.10... Solenoid valve, 12.16.17...
Piping, 18... Inverter, 19... Control device. In addition, the same parts or corresponding parts in the figures are indicated by the same reference numerals. Agent Masuo Oiwa (and 2 others) Figure 1 Figure 2 Figure j

Claims (8)

[Claims] (1) Compressor, four-way valve for switching between air conditioning and heating, indoor heat exchanger,
In a heat pump device for air conditioning/heating and hot water supply equipped with a reversible refrigerant flow expansion mechanism and an outdoor heat exchanger, the compressor discharge side of the refrigerant circuit is branched via a switching valve, and one branch by the switching valve is connected to the four directions. The other branch by the switching valve is connected to the hot water storage tank heating coil, the outlet side of this heating coil is further branched, and one branch on the outlet side of the heating coil is connected to the indoor heat exchanger via one solenoid valve. and a four-way valve, and the other branch on the heating coil outlet side is connected to a pipe connecting an outdoor heat exchanger and a four-way valve via the other solenoid valve. . (2) The heat pump device for air conditioning/heating/hot water supply according to claim vi1, wherein the compressor is configured to control its capacity by an inverter that varies the frequency of its driving power source.・ (3) The heat pump device for air conditioning and hot water supply according to claim 1, wherein the compressor is divided into a plurality of small-capacity units, and only the required number is operated by a control device to control the capacity. . (4) During hot water supply heating operation, the switching valve is connected to the other branch, one solenoid valve is opened, and the other solenoid valve is closed. . (5) During simultaneous cooling and hot water heating operation, the switching valve is connected to the other branch, one solenoid valve is closed, and the other solenoid valve is closed.
Heat pump equipment for hot water supply. (6) During heating/hot water heating selection operation, the switching valve is connected to one branch for heating, and while the heating operation is stopped by the indoor temperature sensor, the switching valve is connected to the other branch for storage. The heat pump device for heating, cooling, and hot water supply according to claim 1, wherein one solenoid valve is opened and the other solenoid valve is closed when heating the m tank. (7) During simultaneous heating and hot water heating operations, the switching valve operates as both branches, communicating with the indoor heat exchanger via the four-way valve and communicating with the hot water storage tank heating coil, so that the refrigerant flowing through this heating coil is connected to one electromagnetic coil. The heat pump device for air conditioning and hot water supply according to claim 1, wherein the other solenoid valve is closed so that the refrigerant passes through the valve and flows into the pipe connecting the indoor heat exchanger and the four-way valve. (8) During simultaneous heating and hot water heating operations, the switching valve is connected to both branches at short intervals to perform heating and hot water alternately.
Heat pump equipment for hot water supply.