Non-reversing defrosting structure of four-way valve

Abstract

The utility model relates to the technical field of air conditioner defrosting, in particular to a defrosting structure with a non-reversing four-way valve, which comprises a compressor, a gas-liquid separator, the four-way valve and a plurality of heat exchangers, the compressor is connected with the four-way valve through a refrigerant pipeline, and the gas-liquid separator is respectively connected with the four-way valve and the compressor. The four-way valve is connected with a plurality of heat exchangers through a plurality of parallel refrigerant pipelines, the heat exchangers are connected with a liquid pipe operating valve through a plurality of parallel refrigerant pipelines, the refrigerant pipelines, connected with the heat exchangers, of the four-way valve are provided with electric valves, and the refrigerant pipelines, connected with the liquid pipe operating valve, of the heat exchangers are provided with electronic expansion valves. The refrigerant pipeline where the electronic expansion valve is located is connected with a backflow pipe with a one-way valve in parallel, the refrigerant pipeline where the compressor is connected with the four-way valve is further connected with a plurality of parallel defrosting loops, the other ends of the parallel defrosting loops are connected with the heat exchanger, and electric valves are arranged on the defrosting loops. The defrosting operation that high-pressure and high-temperature gas is input into a single heat exchanger is achieved, and the operation mode does not need to be switched during defrosting.

Description

Technical Field

[0001] This utility model relates to the field of air conditioning defrosting technology, specifically a defrosting structure with a four-way valve that does not switch directions. Background Technology

[0002] With the growing call for energy conservation, air source heat pumps are gaining an increasingly larger market share due to their water-saving properties. However, during winter heating operation, the evaporator surface of air source heat pumps gradually frosts up due to the low outdoor temperature. As the frost layer on the evaporator becomes thicker, the heating capacity decreases significantly, necessitating defrosting.

[0003] The commonly used defrosting method currently is reverse circulation defrosting using a four-way valve. This method switches the unit from heating to cooling operation by reversing the four-way valve, achieving defrosting. However, this method has several drawbacks: First, switching to cooling lowers the indoor heat exchanger temperature, resulting in a decrease in room temperature and affecting indoor comfort. Second, the switching between the two modes causes significant system pressure fluctuations and substantial changes in refrigerant state, leading to considerable mechanical shock. Third, the noise generated during refrigerant reversal using the four-way valve is relatively loud. Utility Model Content

[0004] The purpose of this invention is to provide a defrosting structure with a four-way valve that does not switch directions, thereby solving the problems of reduced heating performance, large system pressure fluctuations, and high noise caused by defrosting through the switching of the four-way valve.

[0005] To achieve the above objectives, this utility model provides the following technical solution: A defrosting structure with a non-reversing four-way valve includes a compressor, a gas-liquid separator, a four-way valve, and multiple heat exchangers. The compressor is connected to the four-way valve via a refrigerant pipeline. The gas-liquid separator is connected to both the four-way valve and the compressor. The four-way valve is connected to multiple heat exchangers via multiple parallel refrigerant pipelines. The multiple heat exchangers are also connected to a liquid pipe operating valve via multiple parallel refrigerant pipelines. An electric valve is installed on the refrigerant pipeline connecting the four-way valve and the heat exchangers. An electronic expansion valve is installed on the refrigerant pipeline connecting the heat exchangers and the liquid pipe operating valve. The refrigerant pipeline containing the electronic expansion valve is connected in parallel to a return pipe with a one-way valve. The refrigerant pipeline connecting the compressor and the four-way valve is also connected to multiple parallel defrosting circuits. The other end of each of the multiple parallel defrosting circuits is connected to a heat exchanger. An electric valve is also installed on each defrosting circuit.

[0006] Preferably, the electric valve is an electric ball valve.

[0007] Compared with the prior art, the beneficial effects of this utility model are:

[0008] This utility model features a four-way valve-based non-reversing defrosting structure, including a refrigerant pipeline connected to multiple heat exchangers and a compressor connected via a four-way valve. By setting a defrosting circuit on the compressor's exhaust side and electrically controlling the circuit to each heat exchanger via an electric ball valve, defrosting operation is achieved for individual heat exchangers using high-pressure, high-temperature gas. Defrosting does not require switching operating modes, enabling non-reversing defrosting of the outdoor heat exchanger. The overall system pressure fluctuation is minimal, and the stable refrigerant condition prevents shocks, thus solving the problem of poor reverse-cycle defrosting performance. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the defrosting structure of the four-way valve that does not switch directions, according to this utility model.

[0010] In the diagram: 1. Compressor; 2. Gas-liquid separator; 3. Four-way valve; 4. First heat exchanger; 5. Second heat exchanger; 6. First electric ball valve; 7. Second electric ball valve; 8. First electronic expansion valve; 9. Second electronic expansion valve; 10. First check valve; 11. Second check valve; 12. Third electric ball valve; 13. Fourth electric ball valve. Detailed Implementation

[0011] To make the objectives, technical solutions, and advantages of this utility model clear and complete, the embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some, not all, embodiments of this utility model, and are merely used to explain the embodiments of this utility model. They are not intended to limit the embodiments of this utility model. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0012] Example

[0013] Please see Figure 1A defrosting structure with a non-reversing four-way valve includes a compressor 1, a gas-liquid separator 2, a four-way valve 3, a first heat exchanger 4, and a second heat exchanger 5. The compressor 1 is connected to the four-way valve 3 via a refrigerant pipeline. The gas-liquid separator 2 is connected to both the four-way valve 3 and the compressor 1. The four-way valve 3 is connected to the first heat exchanger 4 and the second heat exchanger 5 via two parallel refrigerant pipelines a1 and a2. The first heat exchanger 4 and the second heat exchanger 5 are also connected to a liquid line operating valve via parallel refrigerant pipelines b1 and b2. A first electric ball valve 6 and a second electric ball valve 7 are respectively installed on refrigerant pipelines a1 and a2. Electric ball valve 7, refrigerant lines b1 and b2 are respectively equipped with a first electronic expansion valve 8 and a second electronic expansion valve 9, refrigerant line b1 is connected in parallel with a return pipe c1 equipped with a first one-way valve 10, refrigerant line b2 is connected in parallel with a return pipe c2 equipped with a second one-way valve 11, the refrigerant line connecting compressor 1 and four-way valve 3 is also connected to parallel defrost circuits d1 and d2, the other end of defrost circuits d1 and d2 is respectively connected to the first heat exchanger 4 and the second heat exchanger 5, and defrost circuits d1 and d2 are respectively equipped with a third electric ball valve 12 and a fourth electric ball valve 13.

[0014] Working principle:

[0015] During refrigeration operation, the first electric ball valve 6 and the second electric ball valve 7 of refrigerant lines a1 and a2 are open, the third electric ball valve 12 and the fourth electric ball valve 13 are closed, and the four-way valve 3 is in de-energized mode to switch the adjustment circuit, so that the heat exchanger can release heat to the air source as a condenser. The first one-way valve 10, the second one-way valve 11, the first electronic expansion valve 8 and the second electronic expansion valve 9 are all open to allow liquid flow.

[0016] During heating operation, the first electric ball valve 6 and the second electric ball valve 7 of refrigerant pipes a1 and a2 are opened, the four-way valve 3 is energized and reversed so that the heat exchanger acts as an evaporator to absorb heat from the air, and the first electronic expansion valve 8 and the second electronic expansion valve 9 act as throttling components to control the heating operation.

[0017] When any heat exchanger reaches the defrosting condition, the corresponding first electric ball valve 6 or second electric ball valve 7 closes, and the third electric ball valve 12 / fourth electric ball valve 13 opens; high-pressure, high-temperature gas is introduced from the defrosting circuit d1 or d2 on the exhaust side of compressor 1 to defrost the first heat exchanger 4 / second heat exchanger 5; during the defrosting process, the refrigerant condensed after passing through the first heat exchanger 4 / second heat exchanger 5 flows into the liquid pipe through the first one-way valve 10 / second one-way valve 11; after defrosting is completed, the third electric ball valve 12 / fourth electric ball valve 13 is closed, and the first electric ball valve 6 / second electric ball valve 7 is opened, and normal operation can then be carried out.

[0018] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A defrosting structure with a non-reversing four-way valve, comprising a compressor, a gas-liquid separator, a four-way valve, and multiple heat exchangers, wherein the compressor is connected to the four-way valve via a refrigerant pipeline, and the gas-liquid separator is connected to both the four-way valve and the compressor, characterized in that: The four-way valve is connected to multiple heat exchangers through multiple parallel refrigerant lines. The multiple heat exchangers are also connected to a liquid line operating valve through multiple parallel refrigerant lines. The refrigerant lines connecting the four-way valve and the heat exchangers are equipped with electric valves. The refrigerant lines connecting the heat exchangers and the liquid line operating valves are equipped with electronic expansion valves. The refrigerant lines containing the electronic expansion valves are connected in parallel to a return pipe with a one-way valve. The refrigerant lines connecting the compressor and the four-way valve are also connected to multiple parallel defrost circuits. The other end of each of the multiple parallel defrost circuits is connected to a heat exchanger. The defrost circuits are also equipped with electric valves.

2. The defrosting structure with a non-reversing four-way valve according to claim 1, characterized in that: The electric valve is an electric ball valve.

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