JPS60240967A - 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 an air-conditioning/hot-water supply heat pump device that is capable of air-conditioning/heating and heating of water in a hot water storage tank, and particularly relates to an air-conditioning/heating/hot-water supply heat pump device with an improved refrigerant piping configuration. The present invention relates to a heat pump device.

[Prior art]

BACKGROUND ART Conventionally, there has been a heating/cooling heat pump device shown in FIG. 1, and a heating/cooling/hot water supply heat pump device shown in FIG. 2. Figure 1.

The refrigerant circuit of the heat pump device shown in Fig. 2 includes (3) a compressor 1, a four-way valve 2 for switching between air conditioning and heating, an indoor heat exchanger 3,
An expansion mechanism 4 and an outdoor heat exchanger 5 are provided, respectively. In the heat pump device shown in FIG. 1, a plurality of indoor heat exchangers 3 are provided in parallel between an expansion mechanism 4 of a refrigerant circuit and a four-way valve 20, and each of the indoor heat exchangers 3 is connected to the four-way valve 2 via a solenoid valve 6. In addition, in FIG. 2, T is a hot water storage tank, and 8 is a hot water storage tank 7.
9 is a city water intake port to the hot water tank T, and 10 is a faucet for hot water supply. In the heat pump device shown in FIG. 2, an indoor heat exchanger 3 and a heating coil 8 are provided in parallel between the expansion mechanism 4 of the refrigerant circuit and the four-way valve 2, and these are connected to the four-way valve 2 through the respective electromagnetic valves 6. It is connected to.

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 cools and heats a plurality of rooms. During cooling, high-temperature, high-pressure refrigerant gas 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 (4) valve 4a of the expansion mechanism 4 and is depressurized. For example, the solenoid valves 6, 6 of the two indoor heat exchangers 3, 3 are opened to allow refrigerant to flow when a load is generated, respectively. There, the low-pressure refrigerant liquid from the expansion valve 4a is evaporated in the indoor heat exchanger 3, absorbing heat from the room and being gasified. This low-pressure refrigerant gas passes through the four-way valve 2 and compressor 1
Inhale-! The data is then compressed, and the same cycle is repeated.

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 evaporated. This low-pressure refrigerant gas is sucked into the compressor 1 through the four-way valve 2 and compressed, and the same cycle will be repeated thereafter.

In the heat pump device shown in Fig. 2, a part of the indoor heat exchanger 3 is replaced with a heating coil 8 in a hot water storage tank 7, and when heating hot water, the solenoid valve 6 on the indoor heat exchanger 3 side is closed, and the solenoid valve 6 on the heating coil 8 side is closed. The valve 6 is opened, the four-way valve 2 is set to the warm shoulder side, and the solenoid valve 6 of the indoor heat exchanger 3GIIl is closed during heating and cooling. 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.

By the way, especially in the conventional heat pump device shown in FIG.
Hot water storage? Since all operations are performed in which the water in J7 is heated by the coil 8, it is not possible to recover waste heat from cooling to heat 7K in hot water storage m7. Furthermore, since the same refrigerant is used for air conditioning and hot water supply, there is a drawback that when heating with water power, the temperature is limited to about 55 to 60°C.

[A essential point of the invention]

This invention attempts to eliminate all the drawbacks of the conventional device described above, and the discharge side of the compressor in the first refrigerant circuit is branched via a switching valve such as a three-way valve, and one branch is Connected to a four-way valve, high-temperature, high-pressure refrigerant is guided from the other branch to the heating coil of the hot water storage tank, and the refrigerant heated and condensed in the hot water tank V is switched between cooling and heating operations to create an expansion mechanism for the refrigerant circuit. By selectively guiding water to both sides, it is possible to perform heating, cooling, and hot water at the same time.
Waste heat from cooling can be recovered to heat the water in the hot water storage tank, and the second refrigerant circuit can be operated either in conjunction with the first refrigerant circuit to heat the water in the hot water tank or independently. The purpose of the present invention is to provide a heat pump device for heating, cooling, and hot water supply that is economical and can provide hot water at a high temperature.

[Embodiments of the invention]

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

In FIG. 3, the same reference numerals as in FIGS. 1 and 2 indicate the same or corresponding parts. As the first refrigerant circuit, 1 is a compressor, 2
1 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 installed in the refrigerant circuit in the same way as the conventional one shown in FIG. 6 is a solenoid valve of the indoor heat exchanger 3, T is a hot water storage tank, 8 is a heating coil, 9 is a city water intake to the hot water storage tank 7, and 10 is a faucet for hot water supply.

(7) The branches (,) of the three-way valve 11, which is a switching valve, are provided on the discharge side of the compressor 1 of the refrigerant circuit, one branch (b) is connected to the four-way valve 2, and the other branch (c) is connected to the heating coil B inserted into the hot water storage tank 7 through a pipe 12. Piping 1
2 branches at the outlet side of the heating coil 8, and is connected from the branch part 13 to the expansion mechanism 4 of the refrigerant circuit and the indoor heat exchanger 30 via the electromagnetic valve 14.

A pipe 15 branched from the branch part 13 is connected between the expansion mechanism 4 of the refrigerant circuit and the outdoor heat exchanger 5 via a solenoid valve 16. Further, 17 is an inverter that controls the capacity of the compressor 1, and 1B is a control device that controls the three-way valve 11 and the solenoid valves 14 and 16.

As a second refrigerant circuit, 19 is a compressor, 20 is a condenser,
21 is an expansion mechanism, 22 is an evaporator, the evaporator 22 is at the same height as the heating coil 8 in the hot water tank 7, and the condenser 20 is at least at a position above the evaporator 22 in the hot water tank. It is installed in

Next, the operation of the air conditioning/hot water supply heat pump device of this embodiment will be explained.

During heating, the refrigerant gas discharged from the compressor 1 flows from the branch (b) through the broken line of the four-way valve 2 because the branches (b) and l (c) of the three-way valve 11 (8) are connected. It flows as indicated by the broken line arrow in Figure 3, reaches the indoor 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. Return to compressor 1.

During hot water supply for heating, part of the refrigerant gas discharged from the compressor 1 flows through the switching of the valve 11 in the same manner as during heating, and the other part of the refrigerant gas flows through the branch of the three-way valve 11 (,).
, (,) are also connected, branch (c)
The water in the hot water storage tank 7 is heated by the heating coil 8 through the piping 12, and some of it condenses and becomes a refrigerant liquid, but some of it may not condense and become a gas. The refrigerant passes through the solenoid valve 14, joins with the refrigerant liquid in the refrigerant circuit that has passed through the indoor heat exchanger 3, and thereafter flows in the same manner as during heating. Also, when heating hot water, the three-way valve 11 is branched (
a).

伽) is connected, and when the room temperature rises to a set value with an indoor temperature sensor (not shown) such as a thermostat, the three-way valve 11 is switched and connected to branches (,) and (C), and the heating coil is connected. 8, the water in the hot water storage tank 7 may be heated, and when the room temperature falls below a set value, a selective operation between heating and hot water heating may be performed. Furthermore, the three-way valve 11 is connected and branched (lL)l (b) at short intervals using a timer or the like.
, ), It is also possible to switch to the connection shown in (C) and distribute the refrigerant to heating and hot water supply in a time-divided manner.

During cooling, the refrigerant gas discharged from the compressor 1 is connected to branches (a) and (b) by the three-way valve 11, so that the refrigerant gas discharged from the compressor 1 is
It flows through the solid line of the four-way valve 2 as shown by the solid line arrow in FIG. At this point, it evaporates and becomes refrigerant gas, which returns to the compressor 1 via the solid line of the four-way valve 2.

During cooling hot water supply, the refrigerant gas discharged from the compressor 1 is guided to the heating coil 8 because the three-way valve 11 is connected to branches (a) and (c), where it heats the water in the hot water storage tank 7. After that, the refrigerant liquid flows from the pipe 15 to the solenoid valve 1.
6, the refrigerant passes through the entire expansion mechanism 4, reaches some or all of the plurality of indoor heat exchangers 3, evaporates there, becomes large, and returns to the compressor 1 via the solid line of the four-way valve 2. In this way, all of the refrigerant condensation heat was conventionally dissipated 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 7. water can be effectively recovered as a heating source.

When heating hot water, the refrigerant gas is branched by the three-way valve 11 (a)
, (c), the water passes through the heating coil 8, heats and condenses the water in the hot water storage tank 7, and then passes through the electromagnetic valve 14, the expansion mechanism 4, and reaches the outdoor heat exchanger 5. ,
Here, it evaporates and becomes refrigerant gas, which returns to the compressor 1 via the four-way valve 2.

When the temperature of hot water is raised, the first refrigerant circuit operates in each mode,
When the compressor 19 of the second refrigerant circuit is operated in a superimposed manner or independently, the high temperature refrigerant discharged from the compressor 19 is condensed in the condenser 20, heats the water in the upper part of the hot water storage tank 7, and passes through the expansion mechanism 21. When the water is depressurized, the evaporator 22 absorbs heat from the water in the lower part of the hot water storage tank 7, evaporates it, and returns to the compressor 19. The refrigerant sealed in this second refrigerant circuit is one that is at a higher temperature but has a lower pressure than the refrigerant sealed in the first refrigerant circuit, for example, the first refrigerant (11
) By using R-22 in the refrigerant circuit and R-12 in the second refrigerant circuit, the water in the upper part of the hot water tank 7 can be heated to a higher temperature than by the heating coil 8.

Compared to the conventional case where an electric heater (not shown) or the like is installed near the condenser 20, the temperature raising operation using the second refrigerant circuit transfers heat from the water in the lower part of the hot water storage tank 7 to the upper part. Since heat pump operation that transfers heat to water with a relatively small temperature difference can be performed, the temperature can be effectively raised with a small amount of electricity, especially when a relatively small amount of hot water is used at a high temperature. Furthermore, when the water temperature at the lower part of the hot water storage tank T becomes low, the condensation temperature of the refrigerant flowing through the heating coil 8 in the first refrigerant circuit can be kept low, so the operating efficiency of the first refrigerant circuit can be increased. .

FIG. 4 shows another embodiment of the invention. Figure 4, 3rd
The same reference numerals as in the figure indicate the same or corresponding parts, 23 indicates a heat exchanger, 24 indicates a hot water outlet pipe, and a part of the hot water outlet pipe 24 leading from the condenser 20 of the second refrigerant circuit and the faucet 10 from the hot water storage tank 7. (12) The condenser 20 is disposed inside the heat exchanger 23, and the hot water passing through the outlet pipe 24 is raised by the high-temperature refrigerant discharged from the compressor 19. It is warming.

The second refrigerant circuit operates in the same way as the second refrigerant circuit, but since the hot water in the hot water outlet pipe 24 is heated more directly from the condenser 20, the temperature of the hot water can be raised more effectively.

The above-mentioned heating, heating hot water supply, cooling, cooling hot water supply, and hot water heating operations are controlled by the control device 18 using the three-way valve 11,
Capacity control of the compressor 1 is performed by controlling the electromagnetic valves 14 and 16, the four-way valve 2, and the electromagnetic valve 6, respectively.In addition, the capacity of the compressor 1 is controlled by changing the frequency of the driving power source for the compressor 1 using an inverter 17. In the above embodiment, one indoor heat exchanger 3 is used, but it may be one or more.Although a three-way valve 11 is provided as a switching valve, two two-way valves can be used as switching valves to perform the same operation. You may let them. A switching valve such as a three-way valve may be an electric valve that can adjust the flow rate, and its opening degree can be adjusted according to the refrigerant flow rate in the expansion mechanism 4, and the refrigerant inflow direction can be either left or right as shown in Fig. 3. Even more efficient operation is possible with the use of a type of electrically driven expansion valve. Further, in this embodiment, the indoor and outdoor heat exchangers are air type, but the present invention can also be applied to water type indoor and outdoor heat exchangers. Further, in this embodiment, the capacity of the compressor is controlled by an inverter, but the capacity may be controlled by dividing the compressor into a plurality of units and operating only the necessary number of units by a control device.

〔Effect of the invention〕

As explained above, the present invention includes a compressor 1, a four-way valve 2
, the discharge side of the compressor 1 is branched through all the switching valves 11 such as three-way valves of an air conditioning/hot water supply heat pump device equipped with a refrigerant circuit having an indoor heat exchanger 3, an expansion mechanism 4, and an outdoor heat exchanger 5. , one branch shaft by this switching valve 11) is connected to the four-way valve 2, and the other branch (c) by the switching valve 11 is branched via the heating coil 8 of the hot water storage tank 7,
One pipe 12 that extends from this branch part 13 to between the expansion mechanism 4 of the refrigerant circuit and the indoor heat exchanger 3 via the solenoid valve 14;
Since the other piping 15 is provided from the branch part 13 to between the expansion mechanism 4 of the refrigerant circuit and the outdoor heat exchanger 5 via the electromagnetic valve 16, heating and cooling of multiple rooms and hot water heating can be performed with simple piping. To provide an air-conditioning/hot-water heat pump device that can perform both operations at the same time, heat water in a hot water storage tank T with waste heat during cooling, is economical, and can efficiently heat hot water to a high temperature. can.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing an example of a conventional heating/cooling heat pump device, Fig. 2 is a block diagram showing an example of a conventional heat pump device for cooling/heating/hot water supply, and Fig. 3 is an embodiment of the heat pump device for cooling/heating/hot water supply according to the present invention. FIG. FIG. 4 is a configuration diagram showing an air conditioning/hot water supply heat pump device according to another embodiment of the present invention. 1.19...Compressor, 2,6,11,14.16...
・Valve, 3, 5.23... Heat exchanger, 4.21... Expansion mechanism, 7... Tank, 8... Heating coil, (a)
r (b), (c) + 13...branch, 12, 15
．． 24...Pipe, 17...Inverter, 18...Control device, 20...Condenser, 22...Evaporator (15). Note that the same reference numerals in the figures indicate the same or corresponding parts. Agent: Masuo Ohatsu (2 others) (16) Procedural amendment (voluntary) 591023 Showa year, month, day 2, name of the invention: air-conditioning/hot water heat pump device 3, person making the amendment: Representative Katayuni Part 5, subject of the amendment (1) Claims column in the specification (2) Detailed explanation of the invention column in the specification (3) Drawing 6, content of amendments (1) Fill in the claims column in the specification as shown in the attached sheet to correct. (2) 1 branch (1+) on the 1st line of page 10 of the specification, (c)
,,l is corrected as [branch (a), (1+), 1]. (3) Amend Figure 1 of the drawing as attached. 7. Attached documents (1) Document stating the entire text of the amended scope of claims
1 copy (2) Amended drawings 1 copy 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,
In an air conditioning/hot water heat pump device equipped with a refrigerant circuit having a refrigerant reversible flow expansion mechanism and an outdoor heat exchanger, the pressure Il basin discharge side of the refrigerant circuit is branched via a switching valve, and one side is controlled by the switching valve. Branch (b) is connected to a four-way valve, and branched from the other branch (c) by the switching valve via the heating coil of the hot water storage tank, and from this branch part via the electromagnetic valve, indoor heat exchange is performed with the expansion mechanism of the refrigerant circuit. a first refrigerant circuit comprising one pipe leading between the refrigerant circuit and the outdoor heat exchanger, and the other pipe leading from the branch part to between the expansion mechanism of the refrigerant circuit and the outdoor heat exchanger via a solenoid valve; Compressor, condenser, and expansion mechanism independent of the refrigerant circuit. The evaporator of the second refrigerant circuit consisting of an evaporator is located at approximately the same position as the heating coil in the hot water storage tank, and the hot water outlet pipe is placed below the water surface in the upper part of the hot water storage tank at a position higher than the evaporator, or from the hot water supply pipe leading from the hot water storage tank to the faucet. (1) (2) A pump device for heating, cooling, and hot water supply that is equipped with a condenser. (2) The compressor is 1. [Claim 111] The inverter that changes the frequency of the driving power source to 0r is controlled by 1 to perform row control of 'i'i'.
1. Air conditioning/hot water supply heat pump device Vt as described in item 1. (3) Multiple compressors 1. 'Divide into 7 parts,
Operate only the necessary number of units using the control device, and perform container control 1.
1. The air-conditioning/heating/hot-water supply heat pump device according to claim 1, wherein the heating/cooling/hot water supply heat pump device is configured to perform the following steps. (4) The switching valve is used to divert the other flow (e) when heating hot water.
The air conditioning/hot water heat pump device according to claim 1, wherein the solenoid valve of one piping is opened and the solenoid valve of the other piping is closed. (5) The switching valve is connected to the other branch (c) during simultaneous cooling and hot water heating operation, so that the solenoid valve in one pipe is closed and the solenoid valve in the other pipe is open. An air conditioning/hot water supply heat pump device according to claim #S1. (2) (6) The switching valve is connected to one branch (I) for heating during the heating/hot water heating selection operation, and the other branch (c) is connected while the heating operation is turned off by the indoor temperature sensor. The air conditioning and hot water supply heat pump device according to claim 1, characterized in that the solenoid valve of one pipe is opened and the solenoid valve of the other pipe is closed. . (7) During simultaneous heating and hot water heating operations, the switching valve connects both branches (l+) and (c) to communicate with the indoor heat exchanger via the four-way valve, and communicates with the heating coil in the hot water storage tank. 2. The air conditioning/hot water supply heat pump device according to claim 1, wherein the heat pump device communicates with each other. (8) The switching valve is characterized in that during simultaneous operation of heating and hot water supply, both branches (b) and (c) are switched and connected at short intervals to alternately perform heating and hot water supply. An air conditioning/hot water supply heat pump device according to claim 1. (9) Detect the temperature at the upper part of the hot water storage tank or the hot water outlet temperature,
If the temperature is below a predetermined value, the second refrigerant (3) circuit is switched to the first refrigerant during hot water supply heating, during simultaneous cooling and hot water heating operation, during heating and hot water heating selection operation, and during simultaneous heating and hot water heating operation. Claim 1 characterized in that each mode of operation by the circuit is operated superimposed or independently.
Air conditioning/hot water heat pump equipment described in Section 1. (10) The air conditioning/hot water supply heat pump device according to claim 1, wherein the condenser and the hot water outlet pipe form a heat exchanger. (4)

Claims (9)

[Claims] (1) Compressor, four-way valve for switching between air conditioning and heating, indoor heat exchanger,
In an air conditioning/hot water heat pump device equipped with a refrigerant circuit having a refrigerant reversible 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 is divided by the switching valve. (bl is connected to the four-way valve, and the other branch (,) by the switching valve is branched via the heating coil of the hot water storage tank, and from this branch part, the expansion mechanism of the refrigerant circuit and the indoor heat exchanger are connected via the solenoid valve. a first refrigerant circuit comprising one pipe extending between the two, and the other pipe extending from one branch part between the expansion mechanism of the refrigerant circuit and the outdoor heat exchanger via a solenoid valve; Independently, the evaporator of the second refrigerant circuit, which consists of a compressor, condenser, expansion mechanism, and evaporator, is installed at approximately the same position as the heating coil in the hot water storage tank, and the evaporator is placed below the water surface in the upper part of the hot water storage tank. High position K
Or an air-conditioning/hot-water heat pump device that has a condenser installed in the hot water supply piping from the hot water storage tank to the faucet. (2) The air conditioning and hot water supply heat pump device according to claim 1, wherein the compressor is configured to perform capacity control by an inverter that varies the frequency of its driving power source. (3) The air-conditioning/heating system according to claim 1, characterized in that 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. Hot water heat pump equipment. (4) The switching valve is connected to the other branch (cl) when hot water is heated, so that the solenoid valve of one pipe opens and the solenoid valve of the other pipe closes. The air conditioning/hot water supply heat pump device according to item 1. (5) The switching valve is used during simultaneous cooling and hot water/heating operation. 2. The air-conditioning/heating/hot-water supply heat pump device according to claim 1, wherein the other branch (cl) is connected, and the solenoid valve of one piping is closed and the solenoid valve of the other piping is open. (6) The switching valve is connected to one branch (b) for heating during the heating/hot water heating selection operation, and connected to the other branch (c) while the heating operation is turned off by the indoor temperature sensor. 2. The air-conditioning/heating/hot water heat pump device according to claim 1, wherein a hot water tank is heated, a solenoid valve of one pipe is opened, and a solenoid valve of the other pipe is closed. (7) During simultaneous heating and hot water heating operations, the switching valve connects both branches (b) and (c) to communicate with the indoor heat exchanger via the four-way valve, and also communicates with the heating coil in the hot water storage tank. 2. The air conditioning/hot water supply heat pump device according to claim 1, wherein the air conditioning/hot water supply heat pump device is arranged in a sliding manner. (8) The switching valve is characterized in that during simultaneous operation of heating and hot water supply, both branches (b) and (,) are switched and connected at short intervals to alternately perform heating and hot water supply. An air conditioning/hot water supply heat pump device according to claim 1. (9) Detect the temperature at the upper part of the hot water storage tank or the hot water outlet temperature,
If the temperature is below a predetermined value, the second refrigerant circuit is set to the first refrigerant circuit mode during hot water heating, cooling/hot water heating simultaneous operation, heating/hot water heating selection operation, and heating/hot water heating simultaneous operation. The air-conditioning/heating system according to claim 1, characterized in that it is operated concurrently with or independently of the operation.
Hot water heat pump equipment. flG The air conditioning/hot water supply heat pump device according to claim 1, wherein the condenser and the hot water outlet pipe form a heat exchanger.