A rapid defrosting system and method

Abstract

This invention relates to the field of defrosting technology and discloses a rapid defrosting system, including a four-way valve and a liquid receiver. The four ends of the four-way valve are connected to a compressor, a gas-liquid separator, a condenser, and an evaporator respectively via pipelines. The other end of each compressor is connected to the gas-liquid separator. The other ends of the condenser and evaporator are connected to the liquid receiver, and the pipelines connecting the condenser and evaporator to the liquid receiver are connected via a second pipeline. In this invention, during the defrosting transition from heating, the process does not pass through the liquid receiver. At the instant of defrosting, the liquid receiver changes from high pressure to low pressure, allowing all the liquid refrigerant in the receiver to participate in defrosting. Since the refrigerant is not stored in the receiver, the mass flow rate is high, the heat absorption is significant, and the defrosting time is short.

Description

Technical Field

[0001] This invention relates to the field of defrosting technology, and more particularly to a rapid defrosting system and method. Background Technology

[0002] After a 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 necessary.

[0003] In traditional processes, whether for cooling or heating, the flow is compressor-four-way valve-condenser-liquid receiver-expansion valve-evaporator-gas separator-compressor. When switching from heating to defrosting, i.e. the process switches from heating to cooling, the pressure difference between high and low is small, and the refrigerant is stored in the liquid receiver due to the throttling limitation of the expansion valve. This results in a low defrosting mass flow rate, less heat absorption, and a long defrosting time. Summary of the Invention

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

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A rapid defrosting system includes a four-way valve and a receiver. The four ends of the four-way valve are connected to a compressor, a gas-liquid separator, a condenser, and an evaporator via pipelines, respectively. The other end of each compressor is connected to the gas-liquid separator. The other ends of each condenser and evaporator are connected to the receiver. The pipelines connecting the condenser and evaporator to the receiver are connected via a second pipeline. A first check valve and a second check valve are respectively installed on the pipeline connecting the condenser and the receiver, and on the second pipeline. The first check valve prevents refrigerant from flowing towards the receiver, and the second check valve prevents refrigerant from flowing towards the condenser.

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

[0008] Preferably, the pipeline connecting the condenser and the liquid receiver is further provided with a first dryer filter located on one side of the expansion valve and a third check valve connected in parallel at the inlet and outlet ends of the first dryer filter.

[0009] Preferably, the evaporator is a shell-and-tube heat exchanger, and the condenser is a finned 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 installed on the corresponding pipeline.

[0011] A rapid defrosting method, employing a rapid defrosting system, includes the following steps:

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

[0013] Once frost has formed on the evaporator surface to a certain extent, the defrosting process begins.

[0014] The four-way valve is used for reversing operation;

[0015] The compressor exhaust flows to the four-way valve, then to the condenser, through the first dryer filter, through the expansion valve, and through the second check valve in sequence through the evaporator, the four-way valve and the gas-liquid separator, and finally back to the compressor suction port.

[0016] Complete the defrosting process.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] In this invention, the process of defrosting during heating does not pass through the liquid receiver. At the moment of defrosting, the liquid receiver changes from high pressure to low pressure, so that all the liquid refrigerant in the liquid receiver participates in defrosting. The refrigerant is not stored in the liquid receiver, so the mass flow rate is large, the heat absorption is large, and the defrosting time is short. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the components of a rapid defrosting system proposed in this invention.

[0020] In the diagram: 1. Four-way valve; 2. Compressor; 3. Gas-liquid separator; 4. Condenser; 5. Evaporator; 6. Second pipeline; 7. Second check valve; 8. Expansion valve; 9. Liquid receiver; 10. First dryer filter; 11. Third check valve; 12. First check valve; 13. Second dryer filter. Detailed Implementation

[0021] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0022] Reference Figure 1 A rapid defrosting system includes a four-way valve and a liquid receiver. The four ends of the four-way valve are connected to a compressor, a gas-liquid separator, a condenser, and an evaporator via pipelines, respectively. The other end of each compressor is connected to the gas-liquid separator. The other ends of the condenser and evaporator are connected to the liquid receiver. The pipelines connecting the condenser and evaporator to the liquid receiver are connected via a second pipeline. A first check valve and a second check valve are respectively installed on the pipeline connecting the condenser and the liquid receiver, and on the second pipeline. The first check valve prevents refrigerant from flowing towards the liquid receiver, and the second check valve prevents refrigerant from flowing towards the condenser.

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

[0024] In this embodiment, the pipeline connecting the condenser and the liquid receiver is also provided with a first drying filter located on one side of the expansion valve and a third check valve connected in parallel at the inlet and outlet of the first drying filter.

[0025] A second drying filter is provided between the liquid reservoir and the first check valve, and the second drying filter is installed on the corresponding pipeline;

[0026] The first and second drying filters are used to remove residual moisture in the pipeline to prevent ice blockage, and at the same time filter out impurities such as metal shavings, dust, and metal oxides introduced into the pipeline.

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

[0028] The working principle of this system is as follows:

[0029] During refrigeration operation, the compressor discharges into the four-way valve, then into the condenser, and through the first dryer filter, it flows through the expansion valve, and through the second check valve, it flows sequentially through the evaporator, the four-way valve, and the gas-liquid separator, finally returning to the compressor suction port. During this process, the liquid refrigerant does not pass through the liquid receiver.

[0030] During heating operation, the compressor discharges gas to the four-way valve. The four-way valve is energized and reverses direction, flowing to the evaporator (i.e., shell and tube heat exchanger). Under the one-way blocking action of the second one-way valve, the gas flows to the receiver, then through the second dryer filter and the first one-way valve, through the expansion valve, and then through the third one-way valve, into the condenser (i.e., finned heat exchanger), then back to the four-way valve, into the gas-liquid separator, and back to the compressor.

[0031] A rapid defrosting method, employing a rapid defrosting system, includes the following steps:

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

[0033] Once frost is detected on the evaporator surface to a certain extent, the defrosting process begins, which is the refrigeration process.

[0034] The four-way valve is used for reversing operation;

[0035] The compressor exhaust flows to the four-way valve, then to the condenser, through the first dryer filter, through the expansion valve, and through the second check valve in sequence through the evaporator, the four-way valve and the gas-liquid separator, and finally back to the compressor suction port.

[0036] Complete the defrosting process.

[0037] In this invention, the process of defrosting during heating does not pass through the liquid receiver. At the moment of defrosting, the liquid receiver changes from high pressure to low pressure, so that all the liquid refrigerant in the liquid receiver participates in defrosting. The refrigerant is not stored in the liquid receiver, 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 embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A rapid defrosting system, characterized in that: The device includes a four-way valve and a liquid receiver. Each of the four ends of the four-way valve is connected to a compressor, a gas-liquid separator, a condenser, and an evaporator via pipelines. The other end of each compressor is connected to the gas-liquid separator. The other ends of both the condenser and evaporator are connected to the liquid receiver. The pipelines connecting the condenser and evaporator to the liquid receiver are connected via a second pipeline. A first check valve and a second check valve are respectively installed on the pipeline connecting the condenser and the liquid receiver, and on the second pipeline. The first check valve prevents refrigerant from flowing towards the liquid receiver, and the second check valve prevents refrigerant from flowing towards the condenser. An expansion valve is installed on the pipeline connecting the condenser and the liquid receiver. The pipeline connecting the condenser and the liquid receiver is also equipped with a first dryer filter located on one side of the expansion valve and a third check valve connected in parallel at the inlet and outlet ends of the first dryer filter.

2. The rapid defrosting system according to claim 1, characterized in that: The evaporator is a shell-and-tube heat exchanger, and the condenser is a finned heat exchanger.

3. The rapid defrosting system according to claim 2, characterized in that: A second drying filter is provided between the liquid reservoir and the first check valve, and the second drying filter is installed on the corresponding pipeline.

4. A rapid defrosting method, employing the rapid defrosting system according to any one of claims 1-3, characterized in that: Includes the following steps: During heating operation, the condition of the evaporator surface is monitored; Once frost has formed on the evaporator surface to a certain extent, the defrosting process begins. The four-way valve is used for reversing operation; The compressor exhaust flows to the four-way valve, then to the condenser, through the first dryer filter, through the expansion valve, and through the second check valve in sequence through the evaporator, the four-way valve and the gas-liquid separator, and finally back to the compressor suction port. Complete the defrosting process.

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