KR100367175B1 - Heat pump system - Google Patents

Abstract

The present invention relates to a heat pump system, which performs a heating function and a cooling function simultaneously in one system to efficiently use a heat source, simplify the structure, occupy a small installation area, and increase the coefficient of performance. will be.

The invention conduits the compressor (2), the four-way valve (3), the first heat exchanger (4), the expansion valve (5) (6), the second heat exchanger (7) and the four-way valve (3). 8a to 8d), the basic refrigerant circuit (1) connecting the four-way valve (3) and the compressor (2) by the suction conduit (9), and the supercooled heat exchanger installed in the conduit (8c) 11) 12 and endothermic heat exchanger, which is connected to the first bypass conduit 15 and 16 to the conduits 8b and 8d to maintain a heat exchange relationship with the subcooled heat exchangers 11 and 12. A second bypass conduit for bypassing the expansion valve (5) and the subcooling heat exchanger (11), the expansion valve (6) and the subcooling heat exchanger (12) to the air (13) (14) and the conduit (8c). It was made by connecting (17) and (18).

Description

Heat Pump System {HEAT PUMP SYSTEM}

The present invention relates to a heat pump system.

As is known, the heat pump system is connected to the compressor, four-way valve, indoor heat exchanger, expansion valve, outdoor heat exchanger and the four-way valve in order to the conduit, and the four-way valve and the compressor by the suction conduit to heat During operation, the 4-way valve is operated so that the refrigerant flows to the indoor heat exchanger, so that the high-temperature and high-pressure refrigerant gas compressed by the compressor flows to the indoor heat exchanger acting as a condenser, and heats the condensation heat with the fluid to generate hot water. Heat the indoor air to perform drying or drying of the dry item, expand the high-temperature / high-pressure refrigerant liquid condensed in the indoor heat exchanger in the expansion valve, and evaporate the outdoor air as a heat source in the outdoor heat exchanger acting as an evaporator. After a low temperature and low pressure gas state, the cycle that is sucked into the compressor is repeated. During the cooling operation, the 4-way valve is operated so that the refrigerant flows to the outdoor heat exchanger to condense the high-temperature and high-pressure refrigerant gas compressed by the compressor in the outdoor heat exchanger acting as a condenser, and the high-temperature and high pressure condensed in the outdoor heat exchanger. After cooling the refrigerant liquid in the expansion valve and heat exchange with the fluid in the indoor heat exchanger acting as an evaporator to generate cold water, or to cool the indoor air to perform the cooling or cooling of the object to be cooled, and the low temperature evaporated in the indoor heat exchanger The cycle of inhaling low pressure refrigerant gas into the compressor is repeated.

On the other hand, the above heat pump system is sucked into the compressor because the evaporation of the coolant liquid is not good and the heating capacity is remarkably decreased when the coolant liquid is evaporated when the coolant liquid is evaporated using the outdoor air as a heat source during the heating operation. Many efforts have been made to promote the evaporation of refrigerant gas.

For example, Japanese Utility Model Application Publication No. 4918927 discloses two indoor heat exchangers in a refrigerant circuit, and during cooling operation, one of them acts as an evaporator to evaporate the refrigerant and one to close the heating operation. The city discloses heating of indoor air by making both indoor heat exchangers act as condensers, and Japanese Patent Application Publication No. 5445949 discloses a refrigerant heater in a heating circuit to serve as an evaporator during heating operation. By heating the room by condensing and liquefying the high-temperature and high-pressure refrigerant gas from the compressor in an indoor heat exchanger, the heating capacity is reduced even when the outside air temperature is low by evaporating the refrigerant liquid depressurized by the heating pressure reducing mechanism in the refrigerant heater. The inventors of the present invention provide a compressor, a switching valve and a seal. A refrigerant circuit in which a heat exchanger, a cooling pressure reducing device, a heating pressure reducing device, and an outdoor heat exchanger are connected to a first conduit and a refrigerant gas suction pipe, the first heat exchanger provided between the indoor heat exchanger and the heating pressure reducing device of the first conduit. And a second heat exchanger installed between the outdoor heat exchanger and the conversion valve of the first conduit so as to be positioned above the first heat exchanger, and connected to form a closed circuit through a connection pipe provided with the first heat exchanger and the valve. At the same time, the first and second heat exchangers were filled with a working fluid to promote the evaporation of refrigerant liquid and refrigerant gas introduced into the compressor using the refrigerant liquid condensed and liquefied in the indoor heat exchanger as a heat source. It has been filed.

However, the heat pump system uses only the heat of condensation or the heat of evaporation of the indoor heat exchanger, and performs only the heating or cooling operation of the fluid while discarding the heat of evaporation or the condensation of the outdoor heat exchanger. When the cooling function must be performed at the same time, two heat pump systems must be installed, resulting in a complicated structure, a large installation area, and excessive cost.

In addition, Japanese Utility Model Application Publication No. 4918927 among the evaporation promoting means of refrigerant gas uses a heat source of the compressor when heating and heating indoor air in two indoor heat exchangers serving as condensers. Since the cost of equipment and maintenance is high, and the volume of the indoor heat exchanger installed in the room becomes large, it occupies a large occupied area of the room, which limits the utilization of the indoor space.

In addition, Japanese Patent Application Laid-open No. 5445945, which is designed to use a refrigerant heater as an evaporator during heating operation, does not describe specific technical means of the refrigerant heater, so the volume of the evaporator is small and easy to install. Since the use of heat transfer is inevitable, maintenance costs are inevitably high, and the present inventors also have a problem in that the structure is complicated and maintenance costs are high since the evaporation of the refrigerant liquid is not sufficient when the outside air temperature is low, and in the cold season, an auxiliary heating means must be used. This will be.

SUMMARY OF THE INVENTION In view of the above problems, the present invention provides a heat pump system that performs a heating function and a cooling function simultaneously in one system to efficiently use a heat source, simplify the structure and occupy a small installation area. For the purpose of

Another object of the present invention is to provide a heat pump system capable of increasing the coefficient of performance.

In order to achieve the above object, the present invention is a compressor (2), four-way valve (3), the first heat exchanger (4), expansion valve (5) (6), the second heat exchanger (7) and the four A basic refrigerant circuit (1) connecting the room valve (3) to conduits (8a to 8d) in order, and connecting the four-way valve (3) and the compressor (2) to the suction conduit (9), and the conduit (8c) Heat exchanger with the subcooled heat exchanger (11) (12) and the first bypass conduit (15) (16) connected to the conduit (8b) (8d). The endothermic heat exchanger (13) (14) and the conduit (8c) provided with an expansion valve (5) and a subcooled heat exchanger (11), an expansion valve (6) and a subcooled heat exchanger (12) are installed to maintain the relationship. It is made by connecting the 2nd bypass path conduits 17 and 18 which pass.

1 is a refrigerant circuit diagram of an embodiment of the present invention.

<Description of Signs of Major Parts of Drawings>

2: compressor 3: four-way valve 4, 7: first and second heat exchanger

11, 12: supercooled heat exchanger 13, 14: endothermic heat exchanger

15, 16: first bypass conduit 17, 18: second bypass conduit

1 is a refrigerant circuit diagram of an embodiment of the present invention, reference numeral 1 denotes a basic refrigerant circuit, and the basic refrigerant circuit 1 includes a compressor 2, a four-way valve 3, a first heat exchanger 4, and an expansion valve. (5) (6), the second heat exchanger (7) and the four-way valve (3) in sequence with conduits (8a-8d), and the four-way valve (3) and the compressor (2) in the suction conduit (9).

11 and 12 are subcooled heat exchangers, and the subcooled heat exchangers 11 and 12 are installed in a conduit 8c.

13 and 14 are endothermic heat exchangers, and the endothermic heat exchangers 13 and 14 connect first bypass conduits 15 and 16 to the conduits 8b and 8d so that the supercooled heat exchanger 11 It is installed so that heat exchange relationship with (12) is maintained.

17 and 18 are second bypass conduits, and the second bypass conduits 17 and 18 are expanded valves 5 and subcooled heat exchangers 11 and expansion valves 6 of the conduits 8b and 8c. ) And the check valves 19 and 20 are installed at the same time as bypassing the supercooling heat exchanger 12.

Reference numerals 21 to 24 are valves.

The following operations are explained by function.

1. Heating operation of the first heat exchanger (4) and cooling operation of the second heat exchanger (7)

The four-way valve 3 operates the refrigerant to flow in the solid arrow line, opens the valves 21 and 22, closes the valves 23 and 24, and then operates the compressor 2 to compress the compressor 2. The high-temperature, high-pressure refrigerant gas is condensed in the first heat exchanger (4) which acts as a condenser via the conduit (8b) and heats the condensation heat with water or air, which is a fluid, to generate hot water or to heat indoor air. Alternatively, the drying function of the dried product is performed, and the high-temperature and high-pressure refrigerant liquid condensed in the first heat exchanger 4 expands in the expansion valve 6 via the second bypass conduit 17 and the conduit 8c. After being introduced into the second heat exchanger (7) which acts as an evaporator and generates heat exchanged with the fluid to evaporate heat, cold water is generated by the heat of evaporation or the indoor air is cooled to perform cooling or refrigeration of the stored object. Low-pressure refrigerant gas evaporated in the The heating and cooling functions are simultaneously performed in one system by repeating the cycle of suctioning into the compressor 2 via the pass conduit 16, the conduit 8d, the four-way valve 3 and the suction conduit 9. .

After forming the cycle as described above, the refrigerant liquid of the high temperature and high pressure condensed in the first heat exchanger 4 is supercooled while being radiated in the subcooled heat exchanger 11, and thus the expansion in the expansion valve 6 becomes good. The evaporation efficiency of the refrigerant liquid is improved because it is evaporated in the second heat exchanger (7). Meanwhile, the wet saturated refrigerant gas generated when the refrigerant liquid is evaporated by the heat source around the second heat exchanger 7 is sucked into the compressor 2 via the first bypass conduit 16 and the supercooled heat exchanger. It is heated by the endothermic heat of the condensation heat radiated | emitted by the supercooling heat exchanger 12 via the endothermic heat exchanger 14 which maintains the heat exchange relationship with (12), and becomes a saturation or superheated refrigerant | vapor steam, and is suctioned in a compressor.

Therefore, since the refrigerant liquid is supercooled at the outlet of the first heat exchanger 4 serving as the condenser and the refrigerant gas at the outlet of the second heat exchanger 7 serving as the evaporator is dried or overheated, the grade coefficient is increased. In addition, liquid back and liquid hammer of the compressor are prevented by the saturation or overheating of the refrigerant gas sucked into the compressor 2, thereby improving the reliability of the compressor.

2. Cooling operation of the first heat exchanger (4) and heating operation of the second heat exchanger (7)

Four-way valve (3) is operated so that the refrigerant flows in the dotted line of the arrow, the valves (23) and (24) are open, the valves (21) and (22) are closed, and the compressor (2) is driven and the compressor (2) is compressed. The high-temperature and high-pressure refrigerant gas is condensed in the second heat exchanger 7 via the conduit 8d to perform heating functions such as hot water generation, and the refrigerant liquid condensed in the second heat exchanger 7 passes through the second via. After the expansion in the expansion valve (5) through the pass conduit (18), the conduit (8c) flows into the first heat exchanger (4) and performs a cooling function such as cooling by cooling the heat by evaporation heat exchanged with the fluid. 1 The low-temperature and low-pressure refrigerant gas evaporated in the heat exchanger 4 is transferred to the compressor 2 via the first bypass conduit 15, the conduit 8b, the four-way valve 3, and the suction conduit 9. The cycle of inhalation is repeated.

In forming the cycle as described above, the subcooled heat exchanger 11 and the endothermic heat exchanger 13 are operated in the same manner as in the heating operation of the first heat exchanger 4 and the cooling operation of the second heat exchanger 7. The refrigerant liquid is supercooled at the outlet of the heat exchanger 4 and functions to dry or superheat the refrigerant gas at the outlet of the second heat exchanger 7.

As described above, the present invention can efficiently use a heat source by simultaneously performing heating and cooling functions using both the heat of condensation and the heat of evaporation in the first heat exchanger and the second heat exchanger in one system, simplifying the structure and installing the same. The cost can be reduced by taking up a small area.

Also, by installing a supercooled heat exchanger at the outlet of the first and second heat exchangers as a condenser, and installing an endothermic heat exchanger at the outlet side to maintain a heat exchange relationship with the subcooled heat exchanger when the first and second heat exchangers act as evaporators. By supercooling the refrigerant liquid and drying or overheating the refrigerant gas sucked into the compressor, the performance coefficient is increased, and the liquid back and liquid gap of the compressor are prevented, thereby improving the reliability of the compressor.

Claims (1)

Conduit (8a-8d) to compressor (2), four-way valve (3), first heat exchanger (4), expansion valve (5) (6), second heat exchanger (7) and the four-way valve (3). And a subcooled heat exchanger (11) installed in the conduit (8c) and a basic refrigerant circuit (1) connecting the four-way valve (3) and the compressor (2) by a suction conduit (9). 12) and an endothermic heat exchanger (13) connected to the first conduit (15) and (16) to the conduits (8b) and (8d) so as to maintain a heat exchange relationship with the subcooled heat exchangers (11) and (12). 14 and a second bypass conduit (17) bypassing the expansion valve (5) and the subcooling heat exchanger (11), the expansion valve (6) and the subcooling heat exchanger (12) to the conduit (8c). 18. Heat pump system by connecting