Two-pipe belt heat recovery refrigerating device

Abstract

The utility model discloses a two-pipe belt heat recovery refrigerating device which comprises an indoor unit loop, an indoor evaporator, a first expansion valve, a first filter, a first one-way valve, a liquid storage device, a third liquid separator, an indoor condenser, a third one-way valve, a fourth one-way valve, a first on-off valve and a second on-off valve. Comprising an outdoor unit loop, a compressor, a four-way reversing valve, a gas-liquid separator, an outdoor condenser, a second filter, a second expansion valve and a second one-way valve, the indoor unit loop and the outdoor unit loop are connected through two refrigerant connecting pipes, and the flow direction of refrigerants is controlled through opening and closing of an on-off valve. The system achieves the effect of recycling condensation heat to heat air; the utility model provides a two-pipe condensation heat recovery refrigeration (heat pump) system, which heats air by recovering condensation heat, reduces the use of electric heating, saves energy and reduces consumption. And the method has the characteristics of simple flow and convenience in pipe connection, and is very suitable for being applied to energy-saving reconstruction projects.

Description

Technical Field

[0001] The utility model belongs to the field of refrigeration and air conditioning, and relates to a refrigeration device, in particular to a two-pipe heat recovery refrigeration device. Background Art

[0002] Common constant temperature and humidity air conditioners often use cooling and dehumidification to treat the air to be treated to a low temperature and low humidity state, and then use electric heating to heat the treated low temperature and low humidity air to the required temperature; in this process, the electric heating part of the power consumption used to treat the sensible heat of the air is wasted. In existing energy-saving technologies, part or all of the condensers in the compression refrigeration system can be used as electric heating, and the reheating function can be achieved by recovering the condensation heat of the compression refrigeration system instead of electric heating.

[0003] In the existing technical solutions, such as the condensing heat recovery constant temperature and humidity system and its control method described in patent application No. 202210967232.9, the compressor outlet is divided into two flow paths, which are respectively connected to the outdoor condenser and the indoor condenser. This parallel connection method often requires multiple connecting pipes between the indoor and outdoor units, and more pipeline designs are required in the compressor host. In some application scenarios that require energy-saving modifications, the original indoor and outdoor units need to be replaced, which is costly and is not conducive to directly using the system for energy-saving modifications in existing projects.

[0004] Based on this, the utility model provides a two-pipe condensation heat recovery refrigeration heat pump system, which heats the air by recovering the condensation heat, reduces the use of electric heating, and saves energy and reduces consumption; and has the characteristics of simple process and convenient pipe connection. The internal configuration of the outdoor compressor main unit is simple, close to the conventional main unit configuration, and the transformation can be completed by only adding parts and very few structural changes inside the indoor unit, which is very suitable for application in energy-saving transformation projects. Utility Model Content

[0005] The purpose of the utility model is to provide a two-pipe heat recovery refrigeration device, which has the beneficial effects of connecting the indoor unit circuit and the outdoor unit circuit through two refrigerant connecting pipes, controlling the refrigerant flow direction by opening and closing the on-off valve, so that the system can realize the function of recovering condensation heat to heat the air; by setting a liquid separator, the uniformity of liquid separation of the refrigerant entering the indoor condenser is improved; by setting a one-way valve, the cooling and heating functions of the system are realized, aiming to heat the air by recovering condensation heat, reduce the use of electric heating, save energy and reduce consumption; and has the characteristics of simple process and convenient pipe connection, so as to be suitable for the application of energy-saving transformation projects;

[0006] In order to achieve the above-mentioned purpose, the utility model proposes a two-pipe heat recovery refrigeration device, including an indoor unit circuit, including an indoor evaporator, a first expansion valve, a first filter, a first non-return valve, a liquid reservoir, and also including a third liquid separator, an indoor condenser, a third non-return valve, a fourth non-return valve, a first on-off valve and a second on-off valve; including an outdoor unit circuit, including a compressor, a four-way reversing valve, a gas-liquid separator, an outdoor condenser, a second filter, a second expansion valve and a second non-return valve, the compressor is connected to the gas-liquid separator through a pipeline, the gas-liquid separator is connected to the S port of the four-way reversing valve through a pipeline, the compressor is connected to the D port of the four-way reversing valve through a pipeline, the E port of the four-way reversing valve is connected to the indoor evaporator through a pipeline, the indoor evaporator is connected to the first liquid separator through a pipeline, the first liquid separator is connected to the first expansion valve and the first non-return valve through a pipeline. The first expansion valve is connected to the first filter through a pipeline, the first filter and the first one-way valve are connected to the liquid reservoir through a pipeline, the liquid reservoir is connected to the fourth one-way valve through a pipeline, the fourth one-way valve is connected to the third one-way valve through a pipeline, the third one-way valve is connected to the second on-off valve through a pipeline, the second on-off valve is connected to the first on-off valve through a pipeline, the first on-off valve is connected to the third liquid distributor through a pipeline, the third liquid distributor is connected to the indoor condenser through a pipeline, the indoor condenser is connected to the third one-way valve through a pipeline, the second expansion valve is connected to the second filter and the second one-way valve through a pipeline, the C port end of the four-way reversing valve is connected to the outdoor condenser through a pipeline, the outdoor condenser is connected to the second liquid distributor through a pipeline, the second liquid distributor is connected to the second expansion valve and the second one-way valve through a pipeline, and the second filter is connected to the second expansion valve through a pipeline;

[0007] The indoor unit circuit and the outdoor unit circuit are connected via two refrigerant connecting pipes.

[0008] The outdoor condenser and the indoor condenser are connected in series, that is, during refrigeration operation, the refrigerant flows through the outdoor condenser and the indoor condenser in sequence.

[0009] When the system is in refrigeration operation, the refrigerant first flows through the third liquid distributor and then flows through the indoor condenser. The function of the third liquid distributor is to make the refrigerant liquid flow rate entering each circuit of the indoor condenser uniform.

[0010] The system can be operated in cooling mode or in heating mode.

[0011] The reservoir can achieve bidirectional flow.

[0012] The first and second on-off valves are solenoid valves or electric ball valves, which can realize unidirectional flow control of the circulation or interruption of the refrigerant during refrigeration operation.

[0013] The compressor is fixed frequency or variable frequency.

[0014] The first and second expansion valves are thermal expansion valves or electronic expansion valves to achieve refrigerant throttling.

[0015] The indoor evaporator, indoor condenser and outdoor condenser are air-cooled heat exchangers. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is Example 1 of a two-pipe refrigeration device with heat recovery according to the utility model.

[0017] Figure 2 This is Example 2 of a two-pipe refrigeration device with heat recovery according to the utility model.

[0018] In the attached drawing: indoor unit circuit 101; outdoor unit circuit 102; compressor 1; four-way reversing valve 2; indoor evaporator 3; first liquid distributor 4; first expansion valve 5; first filter 6; first non-return valve 7; second filter 8; second expansion valve 9; second non-return valve 10; second liquid distributor 11; outdoor condenser 12; gas-liquid separator 13; first on-off valve 14; third liquid distributor 15; indoor condenser 16; third non-return valve 17; second on-off valve 18; fourth non-return valve 19; liquid reservoir 20. DETAILED DESCRIPTION

[0019] like Figure 1 to Figure 2 As shown:

[0020] A two-pipe heat recovery refrigeration device, comprising an indoor unit circuit 101, including an indoor evaporator 3, a first expansion valve 5, a first filter 6, a first check valve 7, a liquid storage device 20, and further comprising a third liquid separator 15, an indoor condenser 16, a third check valve 17, a fourth check valve 19, a first on-off valve 14 and a second on-off valve 18; comprising an outdoor unit circuit 102, including a compressor 1, a four-way reversing valve 2, a gas-liquid separator 13, an outdoor condenser 12, a second filter 8, a second expansion valve 9 and a second check valve 10;

[0021] The compressor 1 is connected to the gas-liquid separator 13 through a pipeline, the gas-liquid separator 13 is connected to the S port of the four-way reversing valve 2 through a pipeline, the compressor 1 is connected to the D port of the four-way reversing valve 2 through a pipeline, the E port of the four-way reversing valve 2 is connected to the indoor evaporator 3 through a pipeline, the indoor evaporator 3 is connected to the first liquid separator 4 through a pipeline, the first liquid separator 4 is connected to the first expansion valve 5 and the first check valve 7 through a pipeline, the first expansion valve 5 is connected to the first filter 6 through a pipeline, the first filter 6 and the first check valve 7 are connected to the liquid reservoir 20 through a pipeline, the liquid reservoir 20 is connected to the fourth check valve 19 through a pipeline, the fourth check valve 19 is connected to the third check valve 17 through a pipeline, the third check valve 1 7 is connected to the second on-off valve 18 through a pipeline, the second on-off valve 18 is connected to the first on-off valve 14 through a pipeline, the first on-off valve 14 is connected to the third liquid distributor 15 through a pipeline, the third liquid distributor 15 is connected to the indoor condenser 16 through a pipeline, the indoor condenser 16 is connected to the third one-way valve 17 through a pipeline, the second expansion valve 9 is connected to the second filter 8 and the second one-way valve 10 through a pipeline, the C port end of the four-way reversing valve 2 is connected to the outdoor condenser 12 through a pipeline, the outdoor condenser 12 is connected to the second liquid distributor 11 through a pipeline, the second liquid distributor 11 is connected to the second expansion valve 9 and the second one-way valve 10 through a pipeline, and the second filter 8 is connected to the second expansion valve 9 through a pipeline;

[0022] The indoor unit circuit 101 and the outdoor unit circuit 102 are connected via two refrigerant connecting pipes.

[0023] The outdoor condenser 12 and the indoor condenser 16 are connected in series.

[0024] During the refrigeration operation, the refrigerant first flows through the third liquid separator 15 and then flows through the indoor condenser 16. The function of the third liquid separator 15 is to make the refrigerant liquid flow rate entering each circuit of the indoor condenser 16 uniform.

[0025] The system can operate in cooling mode or heating mode.

[0026] The liquid reservoir 20 can realize bidirectional flow.

[0027] The first on-off valve 14 and the second on-off valve 18 are solenoid valves or electric ball valves, which can realize unidirectional flow control of the circulation or interruption of the refrigerant during refrigeration operation.

[0028] The compressor 1 is of fixed frequency or variable frequency.

[0029] The first expansion valve 5 and the second expansion valve 9 are thermal expansion valves or electronic expansion valves to achieve refrigerant throttling.

[0030] The indoor evaporator 3, the indoor condenser 16 and the outdoor condenser 12 are air-cooled heat exchangers.

[0031] Embodiment 1:

[0032] like Figure 1 A two-pipe refrigeration device with heat recovery shown in the figure includes an indoor unit circuit 101, which contains an indoor evaporator 3, a first liquid separator 4, a first expansion valve 5, a first filter 6, a first non-return valve 7, a liquid storage tank 20, and also includes a third liquid separator 15, an indoor condenser 16, a third non-return valve 17, a fourth non-return valve 19, a first on-off valve 14 and a second on-off valve 18; includes an outdoor unit circuit 102, which includes a compressor 1, a four-way reversing valve 2, a gas-liquid separator 13, an outdoor condenser 12, a second filter 8, a second expansion valve 9 and a second non-return valve 10.

[0033] The indoor unit circuit 101 and the outdoor unit circuit 102 are connected via two refrigerant connecting pipes.

[0034] The four-way reversing valve 2 has four connection ports, which can respectively conduct SE, CD or SC, ED.

[0035] like Figure 1 A two-pipe refrigeration device with heat recovery is shown, which has three operating modes, namely two:

[0036] 1 Simple cooling mode: In this mode, the first on-off valve 14 is closed and does not allow the refrigerant to pass through, the second on-off valve 18 is turned on to allow the refrigerant to pass through, the four-way reversing valve 2SE is turned on, CD is turned on, and the high-temperature and high-pressure refrigerant gas compressed by the compressor 1 flows through the four-way reversing valve 2 and enters the outdoor condenser 12, where it is cooled by the outdoor air into a medium-temperature and high-pressure liquid, and then flows through the second one-way valve 10 and the second on-off valve 18. Since the first on-off valve 14 is in a closed state and the flow direction of the third one-way valve 17 is fixed, the refrigeration The refrigerant cannot enter the indoor condenser 16; the medium-temperature and high-pressure refrigerant liquid then enters the liquid storage tank 20, and then flows through the first filter 6, and the first expansion valve 5 to form low-temperature and low-pressure refrigerant vapor through the throttling effect, and then flows through the first liquid separator 4 for uniform distribution and enters the indoor evaporator 3, forming low-pressure and low-temperature gas under the heating of the air to be treated, and then passes through the four-way reversing valve 2 and flows through the gas-liquid separator 13 and returns to the compressor 1, forming a refrigeration cycle, and the indoor air to be treated is cooled and dehumidified by the cooling of the indoor evaporator 3.

[0037] 2 Refrigeration + condensation heat recovery mode: the first on-off valve 14 is turned on to allow the refrigerant to pass through, the second on-off valve 18 is closed to not allow the refrigerant to pass through, the four-way reversing valve 2SE is turned on, CD is turned on, the high-temperature and high-pressure refrigerant gas compressed by the compressor 1 flows through the four-way reversing valve 2 and enters the outdoor condenser 12, and is cooled by the outdoor air into medium-temperature and high-pressure gas-liquid two-phase, and then flows through the second one-way valve 10 and the first on-off valve 14. Since the first on-off valve 14 is in the on state and the third one-way valve 17 has a fixed flow direction, the refrigerant is evenly distributed through the third liquid distributor 15 and enters the indoor condenser 16 to obtain indoor air The medium-temperature and high-pressure refrigerant liquid is fully cooled to form a medium-temperature and high-pressure refrigerant liquid; the medium-temperature and high-pressure refrigerant liquid then passes through the third one-way valve 17 and enters the liquid storage tank 20, then flows through the first filter 6, and forms a low-temperature and low-pressure refrigerant vapor through the throttling effect after the first expansion valve 5, and then flows through the first liquid distributor 4 for uniform distribution and enters the indoor evaporator 3, forming a low-pressure and low-temperature gas under the heating of the air to be treated, and then passes through the four-way reversing valve 2 and flows through the gas-liquid separator 13 and returns to the compressor 1, forming a refrigeration cycle, and the indoor air to be treated is cooled and dehumidified by the cooling of the indoor evaporator 3, and then reheated by the indoor condenser 16.

[0038] 3 Heating mode: In this mode, the first on-off valve 14 is closed and does not allow the refrigerant to pass through, the second on-off valve 18 is closed and does not allow the refrigerant to pass through, the four-way reversing valve 2SC is turned on, and ED is turned on.

[0039] The high-temperature and high-pressure refrigerant gas compressed by the compressor 1 flows through the four-way reversing valve 2 and enters the indoor evaporator 3, is fully cooled by the air to be treated into a medium-temperature and high-pressure refrigerant liquid, and then flows through the first liquid distributor 4, passes through the first one-way valve 7, flows through the liquid storage tank 20, the fourth one-way valve 19, is filtered by the second filter 8, and forms a low-temperature and low-pressure refrigerant vapor after the throttling action of the second expansion valve 9, then flows through the second liquid distributor 11 for uniform distribution and enters the outdoor condenser 12, forms a low-temperature and low-pressure refrigerant gas under the heating of the outdoor air, and then passes through the four-way reversing valve 2 and the gas-liquid separator 13 and returns to the compressor 1, forming a heating cycle, and the indoor air to be treated is heated by the heating of the indoor evaporator 3.

[0040] Embodiment 2:

[0041] Similar to the embodiment in terms of operating mode, a specific implementation method is provided having multiple groups including 14, 14.1...14.N first on-off valves, 15, 15.1...15.N third liquid distributors, 16, 16.1...16.N indoor condensers, and 17, 17.1...17.N third one-way valves, aiming to illustrate that when the system is configured with multiple groups of the configurations described above, the different opening and closing controls of the first on-off valve 14 can be used to achieve the function of flexibly regulating the condensation heat recovery amount in the refrigeration + condensation heat recovery mode.

Claims

1. A two-pipe heat recovery refrigeration device, characterized in that: The invention comprises an indoor unit circuit (101), an indoor evaporator (3), a first liquid separator (4), a first expansion valve (5), a first filter (6), a first non-return valve (7), a liquid storage device (20), and further comprises a third liquid separator (15), an indoor condenser (16), a third non-return valve (17), a fourth non-return valve (19), a first on-off valve (14), and a second on-off valve (18); and an outdoor unit circuit (102), a compressor (1), a four-way reversing valve (2), a gas-liquid separator (13), an outdoor condenser (12), a second filter (8), The second expansion valve (9) and the second non-return valve (10), the compressor (1) is connected to the gas-liquid separator (13) through a pipeline, the gas-liquid separator (13) is connected to the S port of the four-way reversing valve (2) through a pipeline, the compressor (1) is connected to the D port of the four-way reversing valve (2) through a pipeline, the E port of the four-way reversing valve (2) is connected to the indoor evaporator (3) through a pipeline, the indoor evaporator (3) is connected to the first liquid separator (4) through a pipeline, the first liquid separator (4) is connected to the first expansion valve (5) and the first non-return valve (7) through a pipeline, the first expansion valve (5) is connected to the first non-return valve (7) through a pipeline, The first filter (6) is connected to the first check valve (7) through a pipeline, the first filter (6) and the first check valve (7) are connected to the liquid reservoir (20) through a pipeline, the liquid reservoir (20) is connected to the fourth check valve (19) through a pipeline, the fourth check valve (19) is connected to the third check valve (17) through a pipeline, the third check valve (17) is connected to the second on-off valve (18) through a pipeline, the second on-off valve (18) is connected to the first on-off valve (14) through a pipeline, the first on-off valve (14) is connected to the third liquid distributor (15) through a pipeline, the third liquid distributor (15) is connected to the third on-off valve (18) through a pipeline, The indoor condenser (16) is connected to the third one-way valve (17) through a pipeline, the second expansion valve (9) is connected to the second filter (8) and the second one-way valve (10) through a pipeline, the C port end of the four-way reversing valve (2) is connected to the outdoor condenser (12) through a pipeline, the outdoor condenser (12) is connected to the second liquid distributor (11) through a pipeline, the second liquid distributor (11) is connected to the second expansion valve (9) and the second one-way valve (10) through a pipeline, and the second filter (8) is connected to the second expansion valve (9) through a pipeline; The indoor unit circuit (101) and the outdoor unit circuit (102) are connected via two refrigerant connecting pipes.

2. A two-pipe heat recovery refrigeration device according to claim 1, characterized in that: The outdoor condenser (12) and the indoor condenser (16) are connected in series.

3. A two-pipe heat recovery refrigeration device according to claim 1, characterized in that: The third liquid distributor (15) is used to make the refrigerant liquid flow rate entering each circuit of the indoor condenser (16) uniform.

4. A two-pipe heat recovery refrigeration device according to claim 1, characterized in that: The refrigerant in the liquid storage device (20) flows in two directions.

5. The two-pipe heat recovery refrigeration device according to claim 1, characterized in that: The first on-off valve (14) and the second on-off valve (18) are solenoid valves.

6. A two-pipe heat recovery refrigeration device according to claim 1, characterized in that: The compressor (1) is of fixed frequency.

7. The two-pipe heat recovery refrigeration device according to claim 1, characterized in that: The first expansion valve (5) and the second expansion valve (9) are thermal expansion valves.

8. The two-pipe heat recovery refrigeration device according to claim 1, characterized in that: The indoor evaporator (3) is an air-cooled heat exchanger.

9. The two-pipe heat recovery refrigeration device according to claim 1, characterized in that: The indoor condenser (16) is an air-cooled heat exchanger.

10. The two-pipe heat recovery refrigeration device according to claim 1, characterized in that: The outdoor condenser (12) is an air-cooled heat exchanger.

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