Hot gas defrosting bypass system and method

Abstract

The invention provides a hot gas defrosting bypass system and method, and relates to the technical field of hot gas defrosting. The hot gas defrosting bypass system comprises a compressor, a condenser, a drying filter, a capillary tube, a defrosting electromagnetic valve, an evaporator and a liquid collecting pipe which are sequentially connected through a connecting pipeline to form a refrigerating loop, refrigerant is arranged in the connecting pipeline, and the defrosting electromagnetic valve is arranged on a bypass pipeline; the inflow end of the bypass pipeline is located between the compressor and the condenser, the outflow end of the bypass pipeline is located between the capillary tube and the evaporator and communicated with the connecting pipeline, the bypass pipeline is further communicated with the flow dividing pipeline, the injection end of the flow dividing pipeline is close to the outflow end of the defrosting electromagnetic valve, and the outflow end of the flow dividing pipeline is located between the evaporator and the liquid collecting pipe and communicated with the connecting pipeline. The invention further provides a hot gas defrosting method in a matched mode, and defrosting treatment on the evaporator is achieved. The refrigerating system is simple in structure and low in failure rate, the possibility of liquid return of the refrigerating system during hot gas defrosting is reduced, and the efficiency of the compressor during hot gas defrosting is improved.

Description

Technical Field

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

[0002] Frosting is a common phenomenon in various low-temperature and refrigeration systems. Using hot air to melt the frost layer on the evaporator has become the main defrosting method. At present, hot air defrosting is often used in the refrigeration system of cold chain logistics cold storage. However, the hot air defrosting valve and bypass valve involved in the hot air defrosting method currently used are complex in structure, high in failure rate, and high in cost, which is not conducive to maintaining the stability of the refrigeration system and affects the refrigeration efficiency of the refrigeration system. In addition, hot air defrosting is mostly used in freezers. Once a freezer fails, it will cause greater damage. Therefore, it is urgent to propose a hot air defrosting bypass system and method to effectively improve the defrosting efficiency. Summary of the invention

[0003] The present invention aims to solve the above-mentioned problems and proposes a hot gas defrost bypass system and method, which has a simple structure and is easy to use. It not only achieves the defrosting efficiency of hot gas defrosting, reduces the possibility of liquid return in the refrigeration system, but also improves the efficiency of the compressor in the refrigeration system during hot gas defrosting.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A hot gas defrost bypass system comprises a compressor, a condenser, a drying filter, a capillary tube, a defrost solenoid valve, an evaporator and a liquid collecting pipe.

[0006] Preferably, the exhaust hole of the compressor is connected to the condenser, the drying filter, the capillary tube, the evaporator and the liquid collecting pipe in sequence through a connecting pipeline, and then connected to the suction hole of the compressor to form a refrigeration circuit.

[0007] Preferably, the defrost solenoid valve is arranged on a bypass pipeline; the inlet end of the bypass pipeline is connected between the compressor and the condenser, and the connecting pipeline between the compressor and the condenser is connected to the inlet end of the bypass pipeline; the outflow end of the bypass pipeline is connected between the capillary tube and the evaporator, and the connecting pipeline between the capillary tube and the evaporator is connected to the outflow end of the bypass pipeline.

[0008] Preferably, a refrigerant is arranged in the connecting pipeline.

[0009] Preferably, a shunt pipeline is also provided; the inflow end of the shunt pipeline is close to the outflow end of the defrost solenoid valve and is connected to the bypass pipeline; the outflow end of the shunt pipeline is located between the evaporator and the liquid collecting pipe and is connected to the connecting pipeline.

[0010] Preferably, the defrost solenoid valve has a preset start time.

[0011] A hot gas defrost method, using the hot gas defrost bypass system as described above, specifically comprises:

[0012] When the running time of the refrigeration circuit reaches the preset defrost solenoid valve start time, the defrost solenoid valve opens, so that the connecting pipe is connected to the bypass pipe, and a part of the high-temperature gas discharged from the compressor flows into the evaporator through the bypass pipe, so that the temperature of the evaporator increases to melt the frost layer, and part of it condenses into liquid and returns to the collecting pipe. At this time, another part of the high-temperature gas flows into the collecting pipe through the bypass pipe and the diversion pipe, so that the temperature of the collecting pipe increases, the liquid in the collecting pipe vaporizes quickly, the return air pressure of the compressor increases and the efficiency increases, and another part of the high-temperature gas flows into the condenser through the connecting pipe, condenses into liquid, and flows through the drying filter and the capillary tube in sequence before flowing into the evaporator.

[0013] An application of a hot gas defrost bypass system, wherein the hot gas defrost bypass system as described above is applied to a freezer.

[0014] Beneficial technical effects brought by the present invention:

[0015] The present invention proposes a hot gas defrost bypass system and method. During the defrost process, the defrost solenoid valve is started at a fixed time to defrost the evaporator. A shunt pipeline is designed to increase the temperature of the liquid collecting pipe, so that the liquid in the liquid collecting pipe is quickly vaporized and the return air pressure of the compressor is increased. This not only reduces the possibility of liquid return in the refrigeration system, but also improves the working efficiency of the compressor during hot gas defrosting. The system has a simple structure and low cost, a low failure rate and is easy to maintain, thereby providing technical support for ensuring the efficient operation of the refrigeration system. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural diagram of the hot gas defrost bypass system of the present invention.

[0017] Figure 2 The hot gas defrost bypass system of the present invention is a schematic diagram when used for defrosting.

[0018] In the figure: 1. compressor, 2. condenser, 3. dry filter, 4. capillary tube, 5. defrost solenoid valve, 6. evaporator, 7. liquid collecting pipe. DETAILED DESCRIPTION

[0019] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0020] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0021] In the present invention, the directions or positional relationships indicated by terms such as "upper", "lower", "bottom", "top", etc. are based on the directions or positional relationships shown in the accompanying drawings. They are relational words determined only for the convenience of describing the structural relationships of the various parts or elements of the present invention. They do not specifically refer to any part or element in the present invention and cannot be understood as limitations on the present invention.

[0022] In the present invention, terms such as "connected" and "connection" should be understood in a broad sense, indicating that the connection can be fixed, integral or detachable; it can be directly connected or indirectly connected through an intermediate medium. Relevant scientific research or technical personnel in this field can determine the specific meaning of the above terms in the present invention according to specific circumstances, and they should not be understood as limiting the present invention.

[0023] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0024] The present invention proposes a hot air defrost bypass system, comprising a compressor 1, a condenser 2, a dry filter 3, a capillary tube 4, a defrost solenoid valve 5, an evaporator 6 and a liquid collecting pipe 7, wherein the exhaust hole of the compressor is connected to the condenser, the dry filter, the capillary tube, the evaporator and the liquid collecting pipe in sequence through a connecting pipe, and then connected to the suction hole of the compressor to form a refrigeration circuit, and a refrigerant is arranged in the connecting pipe, such as Figure 1 shown.

[0025] The defrost solenoid valve is arranged on the bypass pipeline, and the defrost solenoid valve is preset with a start time, which is used to control the timing opening of the defrost solenoid valve. The inflow end of the bypass pipeline is connected between the compressor and the condenser, and the connecting pipeline between the compressor and the condenser is connected to the inflow end of the bypass pipeline; the outflow end of the bypass pipeline is connected between the capillary tube and the evaporator, and the connecting pipeline between the capillary tube and the evaporator is connected to the outflow end of the bypass pipeline.

[0026] In this embodiment, a shunt pipeline is also provided, wherein the inflow end of the shunt pipeline is close to the outflow end of the defrost solenoid valve and is connected to the bypass pipeline, and the outflow end of the shunt pipeline is located between the evaporator and the liquid collecting pipe and is connected to the connecting pipeline.

[0027] During the operation of the refrigeration circuit, the high-temperature gas discharged from the compressor flows into the condenser through the connecting pipe and condenses into liquid, then flows through the drying filter and enters the capillary throttling. The liquid refrigerant evaporates in the evaporator and absorbs heat. After evaporating into gas, it returns to the compressor through the collecting pipe, forming a refrigeration cycle. During this refrigeration cycle, the frost layer on the evaporator gradually accumulates, and a small amount of refrigerant liquid flowing through is stored in the collecting pipe. The collecting pipe is used to prevent the refrigerant liquid from directly flowing back to the compressor.

[0028] In order to eliminate the frost layer formed on the evaporator during the refrigeration cycle, the present invention also proposes a hot gas defrosting method, which adopts the hot gas defrosting bypass system as described above, specifically:

[0029] When the refrigeration circuit running time reaches the preset defrost solenoid valve start time, the defrost solenoid valve opens. Figure 2 As shown, the connecting pipeline is connected to the bypass pipeline. At this time, part of the high-temperature gas discharged by the compressor flows into the bypass pipeline through the connecting pipeline, and a very small part of the high-temperature gas flows into the condenser through the connecting pipeline. After condensation in the condenser, it passes through the drying filter and the capillary tube in sequence and flows into the evaporator. The impact of this part on the refrigeration system is small and can be ignored. Since the defrost solenoid valve is opened, the high-temperature gas flowing into the bypass pipeline is divided into two paths. A part of the high-temperature gas flows into the evaporator through the bypass pipeline, so that the temperature of the evaporator rises to melt the frost layer, and part of it condenses into liquid and flows back to the collecting pipe. At the same time, another part of the high-temperature gas flows into the collecting pipe through the bypass pipe and the diversion pipe. At this time, the temperature of the collecting pipe rises, the liquid in the collecting pipe quickly vaporizes, and the liquid content decreases sharply, and flows back to the suction hole of the compressor through the connecting pipe, so that the return air pressure of the compressor increases and the efficiency increases, thereby effectively improving the efficiency of the compressor.

[0030] Although the above describes the specific implementation mode of the present invention in conjunction with the accompanying drawings, it is not a limitation of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without creative work are still within the protection scope of the present invention.

Claims

1. A hot gas defrost bypass system, It is characterized in that It includes compressor, condenser, filter drier, capillary tube, defrost solenoid valve, evaporator and liquid collecting pipe.

2. The hot gas defrost bypass system according to claim 1, It is characterized in that The exhaust hole of the compressor is connected to the condenser, the drying filter, the capillary tube, the evaporator and the liquid collecting pipe in sequence through the connecting pipeline, and then connected to the suction hole of the compressor to form a refrigeration circuit.

3. The hot gas defrost bypass system according to claim 2, It is characterized in that The defrost solenoid valve is arranged on the bypass pipeline; the inflow end of the bypass pipeline is connected between the compressor and the condenser, and the connecting pipeline between the compressor and the condenser is connected to the inflow end of the bypass pipeline; the outflow end of the bypass pipeline is connected between the capillary tube and the evaporator, and the connecting pipeline between the capillary tube and the evaporator is connected to the outflow end of the bypass pipeline.

4. The hot gas defrost bypass system according to claim 3, It is characterized in that A refrigerant is arranged in the connecting pipeline.

5. The hot gas defrost bypass system according to claim 4, It is characterized in that A shunt pipeline is also provided; the inflow end of the shunt pipeline is close to the outflow end of the defrost solenoid valve and is connected to the bypass pipeline; the outflow end of the shunt pipeline is located between the evaporator and the liquid collecting pipe and is connected to the connecting pipeline.

6. The hot gas defrost bypass system according to claim 5, It is characterized in that The defrost solenoid valve is preset with a start time.

7. A hot air defrosting method, It is characterized in that The hot gas defrost bypass system as claimed in claim 5 is specifically: When the running time of the refrigeration circuit reaches the preset defrost solenoid valve start time, the defrost solenoid valve opens, so that the connecting pipe is connected to the bypass pipe, and a part of the high-temperature gas discharged from the compressor flows into the evaporator through the bypass pipe, so that the temperature of the evaporator increases to melt the frost layer, and part of it condenses into liquid and returns to the collecting pipe. At this time, another part of the high-temperature gas flows into the collecting pipe through the bypass pipe and the diversion pipe, so that the temperature of the collecting pipe increases, the liquid in the collecting pipe vaporizes quickly, the return air pressure of the compressor increases and the efficiency increases, and another part of the high-temperature gas flows into the condenser through the connecting pipe, condenses into liquid, and flows through the drying filter and the capillary tube in sequence before flowing into the evaporator.

8. Application of a hot gas defrost bypass system, It is characterized in that The hot gas defrost bypass system as claimed in claim 5 is applied to a freezer.

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