Refrigerator refrigerating unit

Abstract

The utility model discloses a refrigerating unit of refrigerator, include: the compressor, condenser, capillary tube and evaporator that communicate in proper order, the export end of evaporator is communicated with the import end of compressor, and refrigerating unit forms refrigeration cycle, and the import end of evaporator is communicated with the export end of compressor between the bypass defrosting pipeline of compressor, and the bypass defrosting pipeline includes defrosting pipe and joint pipe fitting, and the import end of defrosting pipe is connected with the export end of compressor, and joint pipe fitting includes copper body and aluminum body, and copper body includes and sets up first slender tube department and second slender tube department side by side, and aluminum body includes joint pipe department, and first slender tube department and second slender tube department are communicated with joint pipe department simultaneously, and first slender tube department is connected with the export end of capillary tube, and second slender tube department is connected with the export end of defrosting pipe, and joint pipe department is connected with the import end of evaporator, the utility model discloses the joint pipe fitting of the utility model increases the stability of the connection between defrosting pipe and evaporator, reduces the welding difficulty, and is convenient for installation and later maintenance.

Description

Technical Field

[0001] This utility model relates to the field of refrigeration equipment technology, and in particular to a refrigeration unit for a freezer. Background Technology

[0002] A typical refrigeration unit in a freezer includes a compressor, condenser, capillary tube, and evaporator. The evaporator's surface is in constant contact with moisture in the air, causing condensation to form a frost layer. As the frost layer thickens, the evaporator's cooling efficiency decreases, and it is prone to damage. Therefore, a defrosting device needs to be installed in the refrigeration unit to periodically defrost the evaporator. Currently, most refrigeration units use electric heating for defrosting, but electric heating consumes additional electricity, is slow, and is time-consuming and labor-intensive. Hot refrigerant defrosting has also appeared on the market, using a defrosting pipe between the compressor and evaporator to deliver the high-temperature refrigerant from the compressor to the evaporator for defrosting. However, the defrosting pipe is made of copper, while the evaporator is made of aluminum. Copper and aluminum pipes cannot be directly welded due to their different coefficients of thermal expansion, which can cause the joints to break due to temperature changes, resulting in a short lifespan. Furthermore, the high-temperature refrigerant output from the compressor is a high-pressure gas, which impacts the defrosting pipe during transport, causing it to vibrate and increasing the instability of the connection between the defrosting pipe and the evaporator. Summary of the Invention

[0003] In order to solve the above-mentioned technical problems, the purpose of this utility model is to provide a refrigeration unit that is easy to install and maintain and has a stable connection.

[0004] To achieve the above objectives, this utility model adopts the following technical solution: a refrigeration unit for a freezer, comprising: a compressor, a condenser, a capillary tube, and an evaporator connected in sequence, wherein the outlet end of the evaporator is connected to the inlet end of the compressor, the refrigeration unit forms a refrigeration cycle, a bypass defrosting pipe is connected between the outlet end of the compressor and the inlet end of the evaporator, the bypass defrosting pipe includes a defrosting pipe and a connector fitting, the inlet end of the defrosting pipe is connected to the outlet end of the compressor, the connector fitting includes a copper body and an aluminum body, the copper body includes a first slender tube section and a second slender tube section arranged side by side, the aluminum body includes a connector fitting, the first slender tube section and the second slender tube section are simultaneously connected to the connector fitting, the first slender tube section is connected to the outlet end of the capillary tube, the second slender tube section is connected to the outlet end of the defrosting pipe, and the connector fitting is connected to the inlet end of the evaporator.

[0005] In the above technical solution, it is further preferred that the first slender tube portion constitutes the first cavity, the second slender tube portion constitutes the second cavity, and the connector tube portion constitutes the third cavity, wherein the inner diameter of the first cavity is smaller than the inner diameter of the second cavity, and the inner diameter of the third cavity is larger than the inner diameter of the second cavity.

[0006] In the above technical solution, it is further preferred that the interior of the copper body has a first connecting cavity that connects the first cavity and the second cavity, and the inner diameter of the first connecting cavity is larger than the inner diameter of the second cavity.

[0007] In the above technical solution, it is further preferred that the interior of the aluminum body forms a second connecting cavity that connects to the third cavity, and the first cavity and the second cavity are sequentially connected to the first connecting cavity, the second connecting cavity, and the third cavity; the inner diameter of the second connecting cavity is equal to the inner diameter of the first connecting cavity and is larger than the inner diameter of the third cavity.

[0008] In the above technical solution, it is further preferred that the inner diameter of the first connecting cavity is smaller than the sum of the inner diameters of the first cavity and the second cavity.

[0009] In the above technical solution, it is further preferred that the connector fitting is an integral piece.

[0010] In the above technical solution, it is further preferred that the copper body is made of copper material and the aluminum body is made of aluminum material.

[0011] In the above technical solution, it is further preferred that the evaporator is an aluminum finned evaporator.

[0012] In the above technical solution, a bypass valve is further preferably provided at the inlet end of the defrosting pipe.

[0013] Compared with the prior art, the present invention has the following advantages:

[0014] This invention adds a connector fitting between the capillary tube, defrosting tube, and evaporator to increase the stability of the connection between the defrosting tube and the evaporator. The copper body of the connector fitting can be welded to the copper capillary tube and defrosting tube, and its aluminum body can be welded to the aluminum inlet tube of the evaporator, reducing the welding difficulty and facilitating installation and subsequent maintenance. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the refrigeration unit of a freezer provided in an embodiment of the present utility model.

[0016] Figure 2A longitudinal sectional view of the connector pipe fittings of a refrigeration unit for a freezer provided in an embodiment of this utility model.

[0017] Figure 3 A top view of the connector pipe fittings of a refrigeration unit for a freezer provided in an embodiment of this utility model.

[0018] The components are: 1. Compressor; 2. Condenser; 3. Capillary tube; 4. Evaporator; 5. Defrosting pipe; 6. Connecting pipe fitting; 61. First slender tube section; 610. First cavity; 62. Second slender tube section; 620. Second cavity; 63. Connecting pipe section; 630. Third cavity; 640. First connecting cavity; 650. Second connecting cavity; 7. Bypass valve. Detailed Implementation

[0019] To illustrate the technical content, structural features, achieved objectives, and effects of the application in detail, the technical solutions of the present invention will be described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. In the following description, for illustrative purposes, numerous specific details are set forth to provide a detailed description of various exemplary embodiments or implementations of the invention. However, various exemplary embodiments may also be implemented without these specific details or in one or more equivalent arrangements. Furthermore, the various exemplary embodiments may differ, but are not necessarily exclusive. For example, the specific shape, construction, and characteristics of the exemplary embodiments may be used or implemented in another exemplary embodiment without departing from the inventive concept.

[0020] This utility model embodiment provides a refrigeration unit for a freezer, such as... Figure 1 As shown, the refrigeration unit includes a compressor 1, a condenser 2, a capillary tube 3, and an evaporator 4 connected in sequence. The outlet end of the compressor 1 is connected to the inlet end of the condenser 2, the outlet end of the condenser 2 is connected to the inlet end of the capillary tube 3, the outlet end of the capillary tube 3 is connected to the inlet end of the evaporator 4, and the outlet end of the evaporator 4 is connected to the inlet end of the compressor 1, thereby forming a refrigeration cycle for refrigerant circulation. In this embodiment of the invention, the evaporator 4 is an aluminum finned evaporator.

[0021] A bypass defrosting line is also connected between the outlet end of compressor 1 and the inlet end of evaporator 4. The bypass defrosting line includes defrosting pipe 5 and connector pipe 6. The inlet end of defrosting pipe 5 is connected to the outlet end of compressor 1.

[0022] like Figure 1-3As shown, the connector pipe 6 includes a copper body and an aluminum body. The copper body includes a first slender tube section 61 and a second slender tube section 62 arranged side by side. The aluminum body includes a connector pipe section 63. The first slender tube section 61 and the second slender tube section 62 are simultaneously connected to the connector pipe section 63. The first slender tube section 61 is connected to the outlet end of the capillary tube 3, the second slender tube section 62 is connected to the outlet end of the defrosting pipe 5, and the connector pipe section 63 is connected to the inlet end of the evaporator 4.

[0023] like Figure 2 As shown, the first slender tube 61 forms the first cavity 610, the second slender tube 62 forms the second cavity 620, and the connector tube 63 forms the third cavity 630. The inner diameter d1 of the first cavity 610 is smaller than the inner diameter d2 of the second cavity 620, and the inner diameter d3 of the third cavity 630 is larger than the inner diameter d2 of the second cavity 620.

[0024] The interior of the copper body has a first connecting cavity 640 that connects the first cavity 610 and the second cavity 620. The inner diameter d4 of the first connecting cavity 640 is greater than the inner diameter d2 of the second cavity 620.

[0025] The aluminum body has a second connecting cavity 650 that connects to the third cavity 630. The first cavity 610 and the second cavity 620, the first connecting cavity 640, the second connecting cavity 650 and the third cavity 630 are connected in sequence. The inner diameter d5 of the second connecting cavity 650 is equal to the inner diameter d4 of the first connecting cavity 640 and is larger than the inner diameter d3 of the third cavity 630.

[0026] In this embodiment of the present invention, the inner diameter d4 of the first connecting cavity 640 is less than the sum of the inner diameter d1 of the first cavity 610 and the inner diameter d2 of the second cavity 620.

[0027] In this embodiment of the invention, the connector fitting 6 is an integrally formed part. The copper body is made of copper, and the aluminum body is made of aluminum. The connector fitting 6 is installed between the capillary tube 3, the defrosting tube 5, and the evaporator 4. Its copper body can be welded to the copper capillary tube 3 and the defrosting tube 5, and its aluminum body can be welded to the aluminum inlet tube of the evaporator 4, reducing welding difficulty and facilitating installation and subsequent maintenance. The connector fitting 6 fixes the outlet end of the defrosting tube 5 to one side of the capillary tube 3, strengthening the connection between the defrosting tube 5 and the aluminum tube of the evaporator 4, and improving the stability of the connection between the defrosting tube 5 and the evaporator 4.

[0028] like Figure 1 , 2As shown, a bypass valve 7 is installed at the inlet end of the defrosting pipe 5. When the evaporator 4 needs to defrost, the bypass valve 7 opens, allowing the high-temperature and high-pressure gaseous refrigerant output by the compressor to enter the evaporator 4 through the defrosting pipe 5, the second chamber 620, and the third chamber 630. The high-temperature and high-pressure gaseous refrigerant releases heat in the evaporator 4, melting the frost condensed on the evaporator 4. The refrigerant after heat exchange returns to the compressor 1 through the outlet end of the evaporator 4 until defrosting is complete. Then, the bypass valve 7 closes, realizing the hot refrigerant defrosting process.

[0029] When the refrigeration unit is in normal refrigeration cycle, the bypass valve 7 is closed, and the high-temperature and high-pressure gaseous refrigerant output by the compressor 1 enters the condenser 2. The condenser 2 causes the gaseous refrigerant to condense into high-pressure liquid refrigerant. The capillary tube 3 causes the high-pressure liquid refrigerant to become low-pressure and low-temperature liquid refrigerant, which then enters the evaporator 4 through the first cavity 610 and the third cavity 630. The low-pressure and low-temperature liquid refrigerant absorbs heat and vaporizes in the evaporator 4. The vaporized refrigerant returns to the compressor 1 through the outlet end of the evaporator 4 and is compressed again to enter the refrigeration cycle, thus realizing the refrigeration process.

[0030] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope. The scope of protection of this utility model is defined by the appended claims, specification, and their equivalents.

Claims

1. A refrigeration unit for a freezer, comprising: A compressor, condenser, capillary tube, and evaporator are connected in sequence, wherein the outlet end of the evaporator is connected to the inlet end of the compressor, and the refrigeration unit forms a refrigeration cycle. The refrigeration unit is characterized by having a bypass defrosting line connecting the outlet end of the compressor and the inlet end of the evaporator. The bypass defrosting line includes a defrosting pipe and a connector fitting. The inlet end of the defrosting pipe is connected to the outlet end of the compressor. The connector fitting includes a copper body and an aluminum body. The copper body includes a first slender tube section and a second slender tube section arranged side-by-side. The aluminum body includes a connector fitting. The first slender tube section and the second slender tube section are simultaneously connected to the connector fitting. The first slender tube section is connected to the outlet end of the capillary tube, the second slender tube section is connected to the outlet end of the defrosting pipe, and the connector fitting is connected to the inlet end of the evaporator.

2. The refrigeration unit according to claim 1, characterized in that, The first slender tube portion constitutes a first cavity, the second slender tube portion constitutes a second cavity, and the connector tube portion constitutes a third cavity. The inner diameter of the first cavity is smaller than the inner diameter of the second cavity, and the inner diameter of the third cavity is larger than the inner diameter of the second cavity.

3. The refrigeration unit according to claim 2, characterized in that, The copper body has a first connecting cavity that connects the first cavity and the second cavity, and the inner diameter of the first connecting cavity is larger than the inner diameter of the second cavity.

4. The refrigeration unit according to claim 3, characterized in that, The aluminum body has a second connecting cavity formed inside, which connects to the third cavity. The first cavity and the second cavity are sequentially connected to the first connecting cavity, the second connecting cavity, and the third cavity. The inner diameter of the second connecting cavity is equal to the inner diameter of the first connecting cavity and is larger than the inner diameter of the third cavity.

5. The refrigeration unit according to claim 4, characterized in that, The inner diameter of the first connecting lumen is smaller than the sum of the inner diameters of the first lumen and the second lumen.

6. The refrigeration unit according to claim 5, characterized in that, The aforementioned connector fitting is a single piece.

7. The refrigeration unit according to claim 1, characterized in that, The copper body is made of copper, and the aluminum body is made of aluminum.

8. The refrigeration unit according to claim 1, characterized in that, The evaporator is an aluminum finned evaporator.

9. The refrigeration unit according to claim 1, characterized in that, A bypass valve is installed at the inlet end of the defrosting pipe.

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