Rapid defrosting system and method

Abstract

The invention relates to the technical field of defrosting, and discloses a rapid defrosting system which comprises a four-way valve and a liquid storage device, the four ends of the four-way valve are connected with a compressor, a gas-liquid separator, a condenser and an evaporator through pipelines correspondingly, and the other end of the compressor is connected with the gas-liquid separator; the other end of the condenser and the other end of the evaporator are both connected with the liquid storage device, and pipelines, connected with the liquid storage device, of the condenser and the evaporator are communicated through a second pipeline. According to the invention, during heating and defrosting conversion, the flow does not pass through the liquid storage device, and at the defrosting conversion moment, the liquid storage device is converted from high pressure to low pressure, so that all liquid refrigerants in the liquid storage device participate in defrosting, and the refrigerants are not stored in the liquid storage device, and therefore, the mass flow rate is large, the heat absorption amount is large, and the defrosting time is short.

Description

Technical Field

[0001] The present invention relates to the technical field of defrosting, and in particular to a rapid defrosting system and method. Background Art

[0002] After the heating system has been running for a long time, frost will form on the evaporator. The frost will reduce the heating effect and increase energy consumption, so defrosting is required.

[0003] The traditional process, whether it is cooling or heating, is compressor-four-way valve-condenser-liquid receiver-expansion valve-evaporator-gas separator-compressor. In this way, when heating is switched to defrosting, that is, the heating process is switched to the cooling process, the high and low pressure difference is small, and it is restricted by the throttling of the expansion valve. The refrigerant is stored in the liquid receiver, the defrosting mass flow rate is low, the heat absorption is small, and the defrosting time is long. Summary of the invention

[0004] The purpose of the present invention is to solve the problems existing in the prior art and to propose a rapid defrosting system and method.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A quick defrost system includes a four-way valve and a liquid reservoir, wherein the four ends of the four-way valve are respectively connected to a compressor, a gas-liquid separator, a condenser and an evaporator through pipelines, and the other end of the compressor is connected to the gas-liquid separator; the other ends of the condenser and the evaporator are connected to the liquid reservoir, and the pipelines connecting the condenser and the evaporator to the liquid reservoir are connected through a second pipeline, and a first one-way valve and a second one-way valve are respectively arranged on the pipeline connecting the condenser and the liquid reservoir and on the second pipeline, wherein the first one-way valve is used to prevent the refrigerant from flowing to the liquid reservoir side, and the second one-way valve is used to prevent the refrigerant from flowing to the condenser side.

[0007] Preferably, an expansion valve is provided on the pipeline connecting the condenser and the liquid reservoir.

[0008] Preferably, the pipeline connecting the condenser and the liquid reservoir is further provided with a first drying filter located on one side of the expansion valve and a third one-way valve arranged in parallel at the inlet and outlet ends of the first drying filter.

[0009] Preferably, the evaporator is a shell and tube heat exchanger, and the condenser is a fin heat exchanger.

[0010] Preferably, a second drying filter is provided between the liquid reservoir and the first one-way valve, and the second drying filter is provided on a corresponding pipeline.

[0011] A fast defrosting method, using a fast defrosting system, comprises the following steps:

[0012] During heating operation, the surface status of the evaporator is monitored;

[0013] When the frost on the evaporator surface reaches a certain level, the defrosting process starts;

[0014] The four-way valve performs reversing operation;

[0015] The compressor exhaust goes to the four-way valve, then to the condenser, passes through the first drying filter, flows through the expansion valve, and passes through the evaporator, the four-way valve and the gas-liquid separator in sequence under the action of the second one-way valve, and finally returns to the compressor suction port;

[0016] Complete the defrosting process.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] When the present invention converts frost during heating, the process does not pass through the liquid reservoir. At the moment of defrosting, the liquid reservoir changes from high pressure to low pressure, so that all liquid refrigerant in the liquid reservoir participates in defrosting. The refrigerant is not stored in the liquid reservoir, so the mass flow rate is large, the heat absorption is large, and the defrosting time is short. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The figure is a schematic diagram of the composition of a rapid defrosting system proposed by the present invention.

[0020] In the figure: 1. four-way valve; 2. compressor; 3. gas-liquid separator; 4. condenser; 5. evaporator; 6. second pipeline; 7. second one-way valve; 8. expansion valve; 9. liquid storage tank; 10. first drying filter; 11. third one-way valve; 12. first one-way valve; 13. second drying filter. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0022] Reference Figure 1 , a quick defrost system comprises a four-way valve and a liquid reservoir, wherein the four ends of the four-way valve are respectively connected to a compressor, a gas-liquid separator, a condenser and an evaporator through pipelines, and the other end of the compressor is connected to the gas-liquid separator; the other ends of the condenser and the evaporator are connected to the liquid reservoir, and the pipelines connecting the condenser and the evaporator to the liquid reservoir are connected through a second pipeline, and a first one-way valve and a second one-way valve are respectively arranged on the pipeline connecting the condenser and the liquid reservoir and on the second pipeline, wherein the first one-way valve is used to prevent the refrigerant from flowing to the liquid reservoir side, and the second one-way valve is used to prevent the refrigerant from flowing to the condenser side.

[0023] In this embodiment, an expansion valve is provided on the pipeline connecting the condenser and the liquid reservoir.

[0024] In this embodiment, the pipeline connecting the condenser and the liquid reservoir is further provided with a first drying filter located on one side of the expansion valve and a third one-way valve arranged in parallel at the inlet and outlet ends of the first drying filter;

[0025] A second drying filter is arranged between the liquid reservoir and the first one-way valve, and the second drying filter is arranged on a corresponding pipeline;

[0026] The first filter drier and the second filter drier are used to remove residual moisture in the pipeline to prevent ice blockage and filter impurities such as metal chips, dust, metal oxides, etc. introduced into the pipeline.

[0027] In this embodiment, the evaporator is a shell and tube heat exchanger, and the condenser is a fin heat exchanger.

[0028] The working principle of this system is:

[0029] During refrigeration operation, the compressor exhausts to the four-way valve, then to the condenser, flows through the first drying filter, flows through the expansion valve, and flows through the evaporator, the four-way valve and the gas-liquid separator in sequence through the second one-way valve, and finally returns to the compressor suction port; in this process, the liquid refrigerant does not pass through the liquid receiver in the intermediate process;

[0030] During heating operation, the compressor exhausts air to the four-way valve, which is electrically reversed and flows to the evaporator (i.e., shell and tube heat exchanger). Under the one-way blocking action of the second one-way valve, it flows to the liquid reservoir, then passes through the second drying filter and the first one-way valve, passes through the expansion valve, and then passes through the third one-way valve to enter the condenser (i.e., fin heat exchanger), then returns to the four-way valve, enters the gas-liquid separator, and returns to the compressor.

[0031] A fast defrosting method, using a fast defrosting system, comprises the following steps:

[0032] During heating operation, the surface status of the evaporator is monitored;

[0033] When it is detected that the frost on the evaporator surface reaches a certain degree, the defrosting process begins, that is, the refrigeration process is carried out;

[0034] The four-way valve performs reversing operation;

[0035] The compressor exhaust goes to the four-way valve, then to the condenser, passes through the first drying filter, flows through the expansion valve, and passes through the evaporator, the four-way valve and the gas-liquid separator in sequence under the action of the second one-way valve, and finally returns to the compressor suction port;

[0036] Complete the defrosting process.

[0037] When the present invention converts frost during heating, the process does not pass through the liquid reservoir. At the moment of defrosting, the liquid reservoir changes from high pressure to low pressure, so that all liquid refrigerant in the liquid reservoir participates in defrosting. The refrigerant is not stored in the liquid reservoir, so the mass flow rate is large, the heat absorption is large, and the defrosting time is short.

[0038] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A rapid defrosting system, characterized in that: It includes a four-way valve and a liquid reservoir, the four ends of the four-way valve are respectively connected to the compressor, the gas-liquid separator, the condenser and the evaporator through pipelines, and the other end of the compressor is connected to the gas-liquid separator; the other ends of the condenser and the evaporator are connected to the liquid reservoir, the pipelines connecting the condenser and the evaporator to the liquid reservoir are connected through a second pipeline, and a first one-way valve and a second one-way valve are respectively arranged on the pipeline connecting the condenser and the liquid reservoir and on the second pipeline, the first one-way valve is used to prevent the refrigerant from flowing to the liquid reservoir side, and the second one-way valve is used to prevent the refrigerant from flowing to the condenser side.

2. A rapid defrosting system according to claim 1, characterized in that: An expansion valve is arranged on the pipeline connecting the condenser and the liquid storage device.

3. A rapid defrosting system according to claim 2, characterized in that: The pipeline connecting the condenser and the liquid storage device is also provided with a first drying filter located on one side of the expansion valve and a third one-way valve arranged in parallel at the inlet and outlet ends of the first drying filter.

4. A rapid defrosting system according to claim 3, characterized in that: The evaporator adopts a shell and tube heat exchanger, and the condenser adopts a fin heat exchanger.

5. A rapid defrosting system according to claim 1, characterized in that: A second drying filter is arranged between the liquid reservoir and the first one-way valve, and the second drying filter is arranged on the corresponding pipeline.

6. A rapid defrosting method, using a rapid defrosting system according to any one of claims 1 to 5, characterized in that: The following steps are involved: During heating operation, the surface status of the evaporator is monitored; When the frost on the evaporator surface reaches a certain level, the defrosting process starts; The four-way valve performs reversing operation; The compressor exhaust goes to the four-way valve, then to the condenser, passes through the first drying filter, flows through the expansion valve, and passes through the evaporator, the four-way valve and the gas-liquid separator in sequence under the action of the second one-way valve, and finally returns to the compressor suction port; Complete the defrosting process.

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