JPS61250468A - Heat pump type air-conditioning 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] [Industrial Field of Application] This invention relates to a heat pump-type air-conditioning, heating, and hot-water supply system using an engine or the like as a driving source, in particular, to maintain the required heating capacity even when the outside temperature is low. The present invention relates to an improvement in a heat pump type air-conditioning/heating/water supply device having a refrigerant bypass path for recirculating refrigerant that heats condensed refrigerant with a refrigerant heater and returns it to an indoor heat exchanger.

[Conventional technology]

In recent years, with the diversification of energy, for example, natural gas,
2. Description of the Related Art Various heat pump type air-conditioning, heating, and hot-water supply systems have been proposed that use an engine that uses gasoline, light oil, or the like as a main driving source.

An example of such an engine-driven cooling/heating/water heating system is shown in the third example.
To explain briefly using a diagram, the symbol l in the figure is a water-cooled engine, 2 is a refrigerant compressor driven by this engine l,
This compressor 2 is connected to an indoor heat exchanger 5 via a four-way switching valve 4 via a refrigerant pipe 3, a receiver 6 as a receiver for the condensed refrigerant, an expansion valve 7 as a throttling device, and an outdoor heat exchanger 8. etc., and the closed loop constitutes a known heat pump circuit (refrigerant circuit). That is, in this heat pump circuit, compression 4112 and reheat exchanger 5.8
By switching the circuit of the four-way switching valve 4 installed between the indoor and outdoor heat exchangers 5.8, the indoor and outdoor heat exchangers 5.8 are used as a condenser for heat radiation or an evaporator for heat absorption, respectively, for cooling or heating. .

In addition, 5a and 8a in the figure are the indoor and external heat exchangers 5.8.
Blower attached to, 9a, 9b; 9c.

9d is a check valve that controls the flow of refrigerant during the above-mentioned cooling and heating.

10 is a separate hot water storage tank, and the water supply pipe 11 is located at the bottom.
is connected, and a hot water supply pipe 12 is drawn out from the top, and hot water is supplied as appropriate from the hot water supply port at the tip thereof. In this hot water storage tank 10, the engine 1
An exhaust heat hot water heat exchanger 14 is installed in the middle of the cooling water pipe 13, which constitutes an exhaust heat recovery circuit that recovers the exhaust heat generated in the exhaust heat recovery circuit with the cooling water. It was configured to be able to heat the water stored in the tank 10 with heat to raise its temperature. Here, the above-mentioned exhaust heat recovery circuit recovers the exhaust heat generated in the jacket section, exhaust pipe, etc. of the engine when it is operated using the cooling water supplied for cooling, and uses this as a heat source for hot water supply. A cooling water circulation pump 15 is attached in the middle of the piping 13.

Further, in the heat pump circuit, a receiver 6, an expansion valve 7
A refrigerant heater 1 is provided between the refrigerant pipe 3 between the inlet and the inlet refrigerant pipe 3 when the indoor heat exchanger 5 is warmed up.
6 is disposed, and the upper end of this refrigerant heater 16 is connected to the receiver 6 via a refrigerant bypass passage 17 that intermittently supplies the liquid refrigerant accumulated on the receiver 6 side to the heater 16 depending on the magnitude of the refrigerant pressure. 6. It is connected to the refrigerant pipe 3 between the expansion valve 7. Note that 18 is a capillary that reduces the pressure of the liquid refrigerant on this refrigerant bypass path 17, and 19 is a check valve that prevents the liquid refrigerant from flowing back from the heater 16 side. Moreover, the heater 1
Refrigerant bypass path 2 pulled out from the upper part of the lower chamber 16B of 6
0 is connected to the inlet side of the indoor heat exchanger 5 during heating operation via a check valve 21 that similarly prevents backflow.

Here, as is clear from FIG. 4, the above-mentioned refrigerant heater 16 has a structure in which a closed container is divided into upper and lower chambers 18A and 16B by a partition plate 28 at the bottom. At the bottom of the refrigerant heating chamber 16B on the lower side, a refrigerant heating heat exchanger 23 to which a cooling water bypass path 22 branched from the middle of the cooling water pipe 13 is connected is installed. By selectively opening and closing electromagnetic valves 24 and 25 provided on the cooling water system side, cooling water is appropriately supplied and cut off, and the refrigerant can be selectively heated. By heating the refrigerant by the refrigerant heater 16, when the outside air temperature is low, the evaporation temperature in the outdoor heat exchanger 8 of the heat pump circuit decreases, and the compressor 3
This solves the problem that the suction pressure of the refrigerant decreases and the amount of refrigerant supplied to the indoor heat exchanger 5 as a condenser becomes insufficient.
This was to compensate for the decrease in heating capacity.

Furthermore, a refrigerant bypass passage 26 for refrigerant recovery, which has the function of introducing liquid refrigerant into the heater 16, is connected to the bottom side of the refrigerant heater 16 described above, and a capillary for depressurizing the liquid refrigerant is connected in the middle of the refrigerant bypass passage 26. 27 was provided, and its tip was connected to the suction side pipe 3 of the compressor 2.

In addition, in FIG. 4, the reference numeral 28a indicates the upper and lower chambers 16A, 1.
6B, a communication pipe 29 is an inverted U-shaped siphon pipe that allows the liquid refrigerant temporarily stored in the upper liquid refrigerant introduction chamber 16A to intermittently flow into the lower chamber side; After a predetermined amount of refrigerant is stored in the upper chamber by 29, the refrigerant is sent to the lower chamber, heated by the heat exchanger 23, and the evaporated refrigerant gas is sequentially supplied to the indoor heat exchanger 5 side. It performs operations like this.

[Problems to be Solved by the Invention] By the way, as described above, during heating operation, the condensed refrigerant is intermittently guided to the refrigerant heater 16, gasified by the exhaust heat of the engine 1, and then transferred to the indoor heat exchanger 5 side. According to a conventional device that employs a refrigerant heating method for recirculating refrigerant, the refrigerant for recovering liquid refrigerant has a capillary 27 that generates a low pressure for sequentially introducing the liquid refrigerant into the heater 16 from the receiver 6 side. Since the bypass passage 26 was provided at the bottom and its tip was connected to the suction side of the compressor 2, various problems occurred in terms of device performance. In other words, in such a conventional configuration, even during cooling operation, liquid refrigerant flows into the heater 1.
6 intermittently, even if the circulation of cooling water for exhaust heat recovery to the heater 16 is stopped during this cooling.

Since the refrigerant flows to the indoor heat exchanger 5 and the suction side of the compressor 2, the number of times the refrigerant is intermittently introduced into the heater 16 is large, which poses a problem in terms of the cooling operation efficiency of the device. In addition, in such a conventional configuration, cooling water from the exhaust heat recovery side is supplied to the heater 16 only during heating that requires refrigerant heating.
A circuit switching means (such as a solenoid valve) on the cooling water side was required to introduce the cooling water unevenly.

The present invention has been made in view of the above-mentioned circumstances, and is an inexpensive heat pump that can exhibit the required performance during heating and can minimize the flow of refrigerant to the refrigerant heater side during cooling. The purpose of this project is to obtain an air-conditioning, heating, and hot water supply system.

[Means for solving problems]

In the heat pump type air-conditioning/heating water supply device according to the present invention, liquid refrigerant is introduced from the liquid receiver side constituting the heat pump circuit via the refrigerant bypass path, and the refrigerant gas obtained by heating the liquid refrigerant is used to generate indoor heat. A refrigerant bypass path that depressurizes and leads out the liquid refrigerant from the bottom of the refrigerant heater is installed on the refrigerant piping that constitutes the heat pump circuit, and is connected to the suction of the compressor during heating operation. A check valve is provided on the side, which is connected to the discharge side of the compressor during cooling operation, and which prevents liquid refrigerant from flowing toward the refrigerant pipe in the refrigerant bypass path.

[Effect]

According to the present invention, during cooling, the liquid refrigerant recovery circuit side of the refrigerant heater is at high pressure, so the outflow of refrigerant from the heater is reduced, and therefore the inflow from the receiver side to the heater side is reduced. , the number of intermittent introductions of refrigerant is reduced.

〔Example〕

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail using embodiments shown in the drawings.

FIG. 1 shows an embodiment of the heat pump type air-conditioning/heating/water supply system according to the present invention, and in the same figure, the third embodiment described above is shown.
Components that are the same as or correspond to those in the figures and FIG.

Now, according to the present invention, in the heat pump circuit consisting of the compressor 2, indoor and external heat exchangers 5, 8, receiver 6, expansion valve 7, etc., liquid refrigerant is introduced from the receiver 6 side via the refrigerant bypass path 17. The refrigerant heater 16 is equipped with a refrigerant heater 16 that directs the refrigerant gas obtained by heating the liquid refrigerant to the indoor heat exchanger 5 side.
A refrigerant bypass passage 26 for liquid refrigerant recovery, which depressurizes and leads out the liquid refrigerant from the bottom of the refrigerant, is connected to the suction side of the compressor 2 during heating operation, and to the suction side of the compressor 2 during cooling operation, on the refrigerant piping 3 constituting the heat pump circuit. It is characterized in that a check valve 30 is provided in the refrigerant bypass passage 26 to prevent the liquid refrigerant from flowing toward the medium pipe 3 side.

According to such a configuration, during cooling when refrigerant heating is not required, the refrigerant bypass passage 26 side as a liquid refrigerant recovery circuit of the refrigerant heater 16 becomes high pressure, so that the heater 1
The amount of refrigerant flowing out from the receiver 6 is reduced, and therefore the amount of refrigerant flowing from the receiver 6 side to the heater 16 side is reduced, and the number of intermittent introductions of refrigerant is reduced, and the problems of the conventional method are eliminated. be. Of course, during this cooling, the refrigerant pipe 3 side connected to the refrigerant bypass path 26 for refrigerant recovery becomes high pressure, but due to the presence of the check valve 30, the refrigerant heater 1
The flow into the 6th side is blocked.

Further, according to the above-described configuration, since the flow of liquid refrigerant to the heater 16 is reduced, there is no problem in its operation even if the cooling water that guides engine exhaust heat is circulated within the heater 16. As shown in Fig. 2, bypass path 2
2 may be connected in series with the circuit to the hot water storage tank IO side, and furthermore, means such as a solenoid valve for switching the cooling water circuit, which was conventionally required, is not required.

Note that the present invention is not limited to the structure of the embodiment described above, and the shape, structure, etc. of each part may be modified or changed as appropriate. Furthermore, it goes without saying that the device according to the present invention is not limited to the engine-driven cooling, heating, and hot water supply device as in the embodiments described above, and that various modifications can be made as a heating source for the refrigerant heater 16.

〔Effect of the invention〕

As explained above, according to the heat pump type air conditioning/heating and hot water supply device according to the present invention, a liquid refrigerant is introduced from the liquid receiver side via the refrigerant bypass path, and the refrigerant gas obtained by heating the liquid refrigerant is It is equipped with a refrigerant heater that leads out to the indoor heat exchanger side, and a refrigerant bypass path that decompresses and leads out the liquid refrigerant from the bottom of the refrigerant heater is connected to the compressor during heating operation on the refrigerant piping that constitutes the heat pump circuit. In addition to connecting the refrigerant to the suction side (discharge side during cooling), a reverse valve is provided in this refrigerant bypass path to prevent the flow of liquid refrigerant to the refrigerant piping side, resulting in a simple and inexpensive configuration. Regardless, the heating performance can be improved by installing a refrigerant heater during heating, and since the refrigerant bypass path side on the liquid refrigerant recovery side of the refrigerant heater is at high pressure during cooling, the refrigerant from the refrigerant heater can be improved. The amount of outflow decreases, which reduces the amount of refrigerant flowing into the refrigerant heater from the receiver, reducing the number of intermittent inflows of refrigerant in the refrigerant heating circuit, and causing no operational problems during cooling. There are various excellent effects, such as being able to have a configuration without the need for an optical system.

[Brief explanation of the drawing]

Fig. 1 is a fluid circuit diagram showing one embodiment of a heat pump type air-conditioning/heating/water supply device according to the present invention, Fig. 2 is a fluid circuit diagram showing another embodiment of the invention, and Fig. 3 is a fluid circuit diagram showing a conventional example. 4 are enlarged cross-sectional views of essential parts of the refrigerant heater. 11111...Engine, 2...Compressor, 3...
・Refrigerant piping, 5.8...Indoor, outside heat exchanger, 6.
...Receiver (liquid receiver), 7..Expansion valve (throttle device), 10..φ・Hot water storage tank, 13.φ・φ cooling water piping, 14.・Exhaust heat hot water supply heat exchanger , 16...-refrigerant heater, 17°20.26...refrigerant bypass path, 1
8.27Φ... Capillary, 23... Heat exchanger for heating refrigerant, 30... Check valve.

Claims (1)

[Claims] In an air conditioning/heating/water supply system comprising a heat pump circuit consisting of a compressor, an indoor/outside heat exchanger, a liquid receiver, a throttle device, etc., a liquid refrigerant is introduced from the liquid receiver side via a refrigerant bypass path, and this A refrigerant bypass path for refrigerant recovery, comprising a refrigerant heater that leads out refrigerant gas obtained by heating the liquid refrigerant to the indoor heat exchanger side, and decompressing and leading out the liquid refrigerant from the bottom of the refrigerant heater. is connected to the suction side of the compressor during heating operation and to the discharge side of the compressor during cooling operation on the refrigerant piping that constitutes the heat pump circuit, and is connected to the refrigerant piping side in this refrigerant bypass path. A heat pump type air-conditioning/heating and hot water supply device characterized by being provided with a check valve that blocks the flow of liquid refrigerant.