JPH01310274A - Heat pump type air-conditioning machine - Google Patents

Abstract

PURPOSE:To permit the realization of comfortable indoor air conditioning throughout all seasons by a method wherein wet vapor having a low dryness is supplied to an indoor heat exchanger through an expansion valve to cool a space while the wet vapor having a high dryness is supplied directly to the indoor heat exchanger to heat the space. CONSTITUTION:When flow rate control valves 2, 4 are opened in accordance with the rate of space cooling or heating, wet vapor is sent into a high-pressure refrigerant sending pipe 3. When the flow rate control valves 15, 19 of the side of an indoor machine S are closed totally and the flow rate control valves 16, 21 are opened fully upon effecting the cooling, liquid refrigerant having a low dryness among wet vapor is supplied from a high-pressure refrigerant returning pipe 10 to an expansion valve 20 through a communicating pipe 17 and the liquid refrigerant having a low temperature and a low pressure is supplied to an indoor heat exchanger 13 and the heat exchanger 13 effects cooling in the room. When the heating is effected, the flow rate control valves 16, 21 of the side of the indoor machine S are closed totally and the flow rate control valves 15, 19 are opened fully, then, gaseous refrigerant having a high dryness among the wet vapor is supplied to the indoor heat exchanger 13 from the high-pressure refrigerant sending pipe 3 through the communicating pipe 14a and the indoor heat exchanger 13 effects the heating in the space.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a heat pump type air conditioner in which a compressor is connected to a plurality of indoor heat exchangers via an outdoor heat exchanger.

(Prior Art) Fig. 2 is a circuit diagram showing an example of this type of heat pump type air conditioner. The heat exchanger 105 is an expansion means such as an expansion valve. The indoor heat exchangers 104a and 104b have four-way switching valves 1.02
and the expansion means 1.5.

In this air conditioner, when the four-way switching valve 102 is in the solid line position in the figure, high-temperature refrigerant is transferred to each indoor heat exchanger 104a, 104.
When the four-way switching valve 102 is in the position indicated by the broken line in the figure, low-temperature refrigerant is supplied to each of the indoor heat exchangers 104a and 104a.
104b, and the room can be cooled by its endothermic action.

(Problem 8 to be solved by the invention) However, in the conventional heat pump air conditioner, depending on the position of the four-way switching valve 102, each indoor heat exchanger 104a,
Since the circulation direction of the refrigerant in 104b is fixed, cooling and heating cannot be performed simultaneously in each of the indoor heat exchangers 104a and 104b, and the problem is that cooling and heating cannot be freely selected indoors. was there.

The present invention has been made in view of the above-mentioned problems, and provides a heat pump type air conditioner that can perform cooling and heating at the same time using each indoor heat exchanger, and can freely select between cooling and heating indoors. The purpose is to provide.

(Means for Solving the Problem) In order to achieve the above object, the present invention provides a heat pump air conditioner according to claim (1), in which a plurality of indoor heat exchangers are connected to the compressor via an outdoor heat exchanger. In the heat pump type air conditioner, a high-pressure refrigerant pipe with a first outdoor heat exchanger interposed in parallel is connected to the discharge side of the compressor, and an expansion means and an expansion means are connected to the suction side of the compressor. A second outdoor heat exchanger is interposed in order, and a high-pressure refrigerant return pipe that communicates with the high-pressure refrigerant outgoing pipe is connected to a low-pressure refrigerant return pipe, and is also connected to one of the circulation ports of the indoor heat exchanger. Of the two flow pipes, one flow pipe is connected to the high pressure refrigerant flow pipe via the first control valve, and the other flow pipe is connected to the second flow pipe.
A flow pipe connected to the low-pressure refrigerant return pipe via a control valve of the indoor heat exchanger, and a flow pipe connected to the other flow port of the indoor heat exchanger is connected to the high-pressure refrigerant return pipe via a branch part. A third control valve is interposed in the conduit, and an expansion means and a fourth control valve are interposed in order from the indoor heat exchanger side in the other branch conduit.

Further, in the heat pump air conditioner according to claim (2),
The high-pressure refrigerant sending pipe has a gas passage and a liquid passage therein, and a flow pipe connected to the high-pressure refrigerant sending pipe is connected to the gas passage side.

(Function) According to the heat pump type air conditioner according to claim (1), gaseous refrigerant and liquid refrigerant flow into the high-pressure refrigerant inlet pipe from the first outdoor heat exchanger due to the operation of the compressor. Mixed wet steam is fed.

That is, when the first and third control valves on the indoor heat exchanger side are closed and the second and fourth control valves are opened, wet steam with low dryness is supplied from the high-pressure refrigerant return pipe to the expansion means. A low-temperature, low-pressure refrigerant is supplied from the expansion means to the indoor heat exchanger, and the room is cooled by an endothermic action. The low-pressure refrigerant that has passed through the indoor heat exchanger is sucked into the compressor through the low-pressure refrigerant return pipe. In addition, when the second and fourth control valves on the indoor heat exchanger side are closed and the first and third control valves are open, highly dry wet steam flows from the high-pressure refrigerant pipe to the indoor heat exchanger. The room is heated by the supplied heat and its heat dissipation action. The high-pressure refrigerant that has passed through the indoor heat exchanger is sequentially sent to the expansion means and the second outdoor heat exchanger through the high-pressure refrigerant return pipe, and is brought to a low pressure and low temperature and is sucked into the compressor.

Further, according to the heat pump type air conditioner according to claim (2), during heating, a gaseous refrigerant with a higher degree of dryness is supplied from the high-pressure refrigerant sending pipe to the indoor heat exchanger via the flow pipe, and the heat dissipation action is performed. The room is heated.

(Embodiment) FIG. 1(a) is a circuit diagram of a heat pump type air conditioner showing an embodiment of the present invention, and the illustrated example shows one in which three indoor heat exchangers are connected.

A high-pressure refrigerant outgoing pipe 3 is connected to a discharge side 1a of the compressor 1 with a flow rate control valve 2 interposed therebetween. As shown in a perspective cross-sectional view in FIG. 1(b), this high-pressure refrigerant inlet pipe 3 has a liquid passage 3a and a gas passage 3, each of which has a substantially circular cross section and which partially communicates with each other.
(b) inside, so that when wet steam containing a mixture of gaseous refrigerant and liquid refrigerant passes through the inside, the gaseous refrigerant and liquid refrigerant can be separated vertically and circulated. It has become. Further, a conduit 6 connecting a flow control valve 4 and a first outdoor heat exchanger 5 in this order from the compressor 1 side is connected to the high-pressure refrigerant sending pipe 3 in parallel with the flow control valve 2 .

Further, the suction side 1b of the compressor 1 is connected to the high-pressure refrigerant inlet pipe 3, and has an expansion valve 7 and a second
A high-pressure refrigerant return pipe 10 is connected to the outdoor heat exchanger 8 and the flow rate control valve 9 in this order. This high-pressure refrigerant return pipe 10, as shown in a perspective cross-sectional view in FIG. When steam passes through the interior, gaseous refrigerant and liquid refrigerant can be separated into upper and lower portions and allowed to flow.

Further, a low-pressure refrigerant return pipe 11 having a substantially circular cross section is connected to the suction side 1b of the compressor 1 via a flow rate control valve 12.

On the other hand, two flow pipes 14a and 14b are connected to one flow port 13a of the indoor heat exchanger 13 disposed in each indoor unit S, and one flow pipe 14a is connected to a first flow control valve. 15, it is connected to the gas passage 3a side of the high-pressure refrigerant outgoing pipe 3, as shown in FIG. 1(b). Further, the other flow pipe 14b is connected to the low-pressure refrigerant return pipe 12 via a second flow control valve 16.

Further, the other end of the flow pipe 17, which has one end connected to the liquid passage 10a side of the high-pressure refrigerant return pipe 10, is connected to the other flow port 13b of the indoor heat exchanger 13, as shown in FIG. 1(C). It is connected. This flow pipe 17 has a branch part 18 that branches into two in the middle of the pipe, one branch pipe 18a is interposed with a third flow rate control valve 19, and the other branch pipe 18b is interposed. An expansion valve 20 and a fourth flow control valve 21 are interposed in this order from the indoor heat exchanger 13 side.

Below, air conditioning in the heat pump type air conditioner will be explained with reference to FIG. 3.

First, a case will be described in which heating and cooling are completely differentiated in summer, winter, etc.

When cooling is performed in all the indoor heat exchangers 13, the flow control valves 2.9 are fully opened, the flow control valves 4 and 11 are fully open, and the second and fourth flow control valves are fully opened on the indoor unit S side. The valve 16.21 is fully opened, and the first and third flow control valves 15.19 are fully opened. As a result, the high-pressure, high-temperature gaseous refrigerant discharged from the compressor 1 radiates heat and liquefies in the first outdoor heat exchanger 5, and then is supplied from the high-pressure refrigerant outgoing pipe 3 to the high-pressure refrigerant return pipe 10 to the expansion valve 2o. A low-temperature, low-pressure liquid refrigerant is supplied from the expansion valve 20 to the indoor heat exchanger 13, and the room is cooled by an endothermic action in the indoor heat exchanger 13.

The low-pressure gaseous refrigerant that has passed through the indoor heat exchanger 13 is sucked into the compressor 1 through the low-pressure refrigerant return pipe 12.

In addition, when performing heating in all the indoor heat exchangers 13, the flow control valves 4 and 11 are fully opened and the flow control valves 2 and 9 are fully open, contrary to the case of cooling, and the indoor unit S side is fully opened. The first and third flow control valves 15.19 are fully opened, and the second and fourth flow control valves 16.21 are fully opened. As a result, the high-pressure, high-temperature gaseous refrigerant discharged from the compressor 1 is supplied to the indoor heat exchanger 13 through the high-pressure refrigerant outgoing pipe 3, and the indoor heat exchanger 13 heats the room by heat radiation. The high-pressure liquid refrigerant that has passed through the indoor heat exchanger 3 passes through the high-pressure refrigerant return pipe 10 to the expansion valve 7.
The air is then sent to the second outdoor heat exchanger, where the pressure becomes low and the temperature becomes low, and the air is sucked into the compressor 1.

Next, a case where cooling and heating are mixed will be explained.

When cooling and heating are mixed, the flow control valves 2.4 are opened according to the ratio of cooling and heating, respectively. As a result, the operation of the compressor 1 causes wet steam to be sent into the high-pressure refrigerant pipe 3 beyond the first outdoor heat exchanger 5. The unused portion of this wet steam is sent through the high-pressure refrigerant return pipe 10 to the expansion valve 7 and the second outdoor heat exchanger in order, and becomes a low-pressure and low-temperature compressor 1.
is inhaled. Note that the degree of dryness of the refrigerant sucked into the compressor 1 is appropriately adjusted by the opening degree of the flow control valves 9 and 11.

When cooling with indoor unit S, the first air conditioner on the indoor unit S side
The third flow control valve 15.19 is fully opened, and the second and fourth flow control valves 16.21 are fully opened.

As a result, a liquid refrigerant with a low degree of dryness among wet steam is supplied from the high-pressure refrigerant return pipe 10 to the expansion valve 20 via the distribution pipe 17, and a low-temperature, low-pressure liquid refrigerant is supplied from the expansion valve 20 to the indoor heat exchanger 13. A refrigerant is supplied, and the room is cooled by an endothermic action in the heat exchanger 13. The low-pressure gaseous refrigerant that has passed through the indoor heat exchanger 13 is sucked into the compressor 1 through the low-pressure refrigerant return pipe 12.

When performing heating with indoor unit S, the second
The fourth flow control valve 16.21 is fully opened, and the first and third flow control valves 15.19 are fully opened.

As a result, a gaseous refrigerant with a high degree of dryness among wet steam is supplied from the high-pressure refrigerant inlet pipe 3 to the indoor heat exchanger 13 via the distribution pipe 14a, and the indoor heat exchanger 13 heats the room by heat dissipation. will be carried out. The high-pressure liquid refrigerant that has passed through the indoor heat exchanger 13 is transferred to the high-pressure refrigerant return pipe 10.
The air is sent through the expansion valve 7 and the second outdoor heat exchanger 8 in order, and becomes low pressure and low temperature, and is sucked into the compressor 1.

In this manner, according to the embodiment, the liquid refrigerant with a low degree of dryness among the wet steam is transferred to the indoor heat exchanger 1 through the expansion valve 20.
3 for cooling, and heating by directly supplying the dry gaseous refrigerant of wet steam to the indoor heat exchanger 13, cooling and heating can be performed by each indoor heat exchanger. This can be done simultaneously using the air conditioner 13, and cooling and heating can be freely selected by opening and closing the first to fourth flow control valves 15, 16, 19° 21 in the room. Therefore, it is possible to realize comfortable indoor air conditioning that meets the preferences of indoor residents not only in summer and winter but throughout all seasons.

Note that the wet steam passing through the high-pressure refrigerant return pipe 10 radiates heat as it circulates, and its dryness is lower than that of the wet steam passing through the high-pressure refrigerant return pipe 3.
Even if the refrigerant 0 is made of a pipe material having a circular cross section, liquid refrigerant with low dryness can be supplied from the high-pressure refrigerant return pipe 10 to the expansion valve 20 during cooling. In addition, each indoor heat exchanger 1
It goes without saying that the heat absorption and heat dissipation capabilities in No. 3 can be changed as appropriate by adjusting the opening degree of each flow control valve 15.16, 19.21 of the indoor unit S.
16.19.21 can also be used for control valves that only open and close. Furthermore, the mixing ratio of wet steam can be easily set by predicting the number and operating conditions of each indoor unit, so the flow control valves 2.4 and 9.11 are not necessarily necessary, and the orifice etc. It can also be substituted with .

(Effects of the Invention) As explained above, according to the heat pump air conditioner according to claim (1), by supplying wet steam with low dryness to the indoor heat exchanger via the expansion valve, cooling can be achieved. Heating can be performed by supplying highly dry wet steam directly to the indoor heat exchanger, so each indoor heat exchanger can perform cooling and heating at the same time. You can freely choose between cooling and heating. Therefore, it is possible to realize comfortable indoor air conditioning that meets the preferences of indoor residents not only in summer and winter but throughout all seasons.

Further, according to the heat pump air conditioner according to claim (2), during heating, a gaseous refrigerant with a higher degree of dryness can be supplied from the high-pressure refrigerant sending pipe to the indoor heat exchanger via the distribution pipe. Therefore, in addition to the above-mentioned effects, there is an advantage that indoor heating can be performed more effectively.

[Brief explanation of the drawing]

Figures 1(a) to 1(C) show an embodiment of the present invention. Figure 1(a) is a circuit diagram of a heat pump air conditioner, and Figure 1(b) is a circuit diagram of a heat pump air conditioner. Cross-sectional perspective view of the tube, 1st
Figure (C) is a cross-sectional perspective view of a high-pressure refrigerant return pipe, Figure 2 is a circuit diagram of a conventional heat pump type air conditioner, and Figure 3 is an explanatory diagram of air conditioning. DESCRIPTION OF SYMBOLS 1... Compressor, 3... High-pressure refrigerant sending pipe, 5... First outdoor heat exchanger, 7, 20... Expansion valve (expansion means)
, 8... Second outdoor heat exchanger, 10... High pressure refrigerant return pipe, 12... Low pressure refrigerant return pipe, 13... Indoor heat exchanger, 14a', 14b, 17... Distribution Tube, 15...
・First flow control valve (first control valve), 16...second
Flow control valve (second control valve), 17... first flow control valve (third control valve), 18... first flow control valve (fourth control valve), S. ...Indoor unit. Patent applicant Sanden Corporation

Claims (2)

[Claims] (1) In a heat pump air conditioner in which a plurality of indoor heat exchangers are connected to a compressor via an outdoor heat exchanger, a first outdoor heat exchanger is interposed in parallel on the discharge side of the compressor. A high-pressure refrigerant return pipe is connected to the high-pressure refrigerant return pipe, and an expansion means and a second outdoor heat exchanger are interposed in this order on the suction side of the compressor, and the high-pressure refrigerant return pipe is in communication with the high-pressure refrigerant return pipe. and connecting one of the two flow pipes connected to one of the flow ports of the indoor heat exchanger to the high-pressure refrigerant outgoing pipe via a first control valve. The other flow pipe is connected to the low pressure refrigerant return pipe via a second control valve, and the flow pipe connected to the other flow port of the indoor heat exchanger is connected to the high pressure refrigerant return pipe via a branch part. connected to the return pipe, a third control valve is interposed in one branch pipe, and an expansion means and a fourth control valve are sequentially interposed in the other branch pipe from the indoor heat exchanger side. A heat pump air conditioner. (2) Claim (1) characterized in that the high-pressure refrigerant sending pipe has a gas passage and a liquid passage therein, and a flow pipe connected to the high-pressure refrigerant sending pipe is connected to the gas passage side. The heat pump air conditioner described.