Defrosting mechanism for refrigerating unit

Abstract

The utility model relates to the field of refrigerating units, and discloses a defrosting mechanism for a refrigerating unit, which comprises an evaporator, a driving mechanism is arranged on the side wall of the right end of the evaporator, a scraper blade is arranged on the outer wall of the driving mechanism, the inner wall of the evaporator is fixedly connected with a supporting plate, the inner wall of the supporting plate penetrates through and is fixedly connected with a U-shaped pipe, and the U-shaped pipe is fixedly connected with the right end of the evaporator. An air injection valve is arranged at the lower end of the right side of the U-shaped pipe. According to the defrosting device, two modes of hot air and mechanical defrosting are combined, heat generated by the compressor is used for providing a heat source for hot air in the U-shaped pipe, the heat is transmitted to the periphery when the hot air circulates to accelerate defrosting of a frost layer, and meanwhile the motor drives the reciprocating lead screw to drive the scraping plate to scrape frost on the inner wall of the evaporator and the surface of the heat exchange pipe. In addition, the air pump blows air to the annular pipe, so that hot air is evenly distributed in the evaporator, it is guaranteed that the whole evaporator is fully heated, and the uniformity of the defrosting effect is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of refrigeration units, and in particular to a defrosting mechanism for refrigeration units. Background Technology

[0002] A refrigeration unit is a device used to provide a low-temperature environment. It transfers heat from a specific space or object through a refrigeration system to achieve the purpose of cooling or freezing. During the operation of a refrigeration unit, the temperature is lower than the dew point temperature of the surrounding air. As the frost layer gradually thickens, it affects the efficiency of subsequent heat exchange, so a defrosting mechanism is required.

[0003] In the existing technology, the commonly used defrosting method for refrigeration units is hot air defrosting. Hot air defrosting uses the heat of high-temperature and high-pressure gas discharged from the compressor to melt the frost layer. However, this method has the problem of uneven distribution of hot air, which can easily lead to frost residue in some areas of the evaporator. Manual frost scraping is not only labor-intensive, but also inconvenient for manual operation due to the relatively small size of the evaporator. Therefore, a defrosting mechanism for refrigeration units is proposed to solve the above problems. Utility Model Content

[0004] To overcome the above shortcomings, this utility model provides a defrosting mechanism for refrigeration units, aiming to improve the problem of low defrosting efficiency in some existing technologies.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a defrosting mechanism for a refrigeration unit, comprising an evaporator, a driving mechanism provided on the right side wall of the evaporator, a scraper provided on the outer wall of the driving mechanism, a support plate fixedly connected to the inner wall of the evaporator, a U-shaped tube passing through and fixedly connected to the inner wall of the support plate, an air injection valve provided at the lower right end of the U-shaped tube, an exhaust valve provided at the upper right end of the U-shaped tube, a ring pipe installed on the outer wall of the evaporator, an air pipe provided on the outer wall of the ring pipe, a drain pipe provided at the bottom end of the evaporator, and a filter assembly provided on the inner wall of the drain pipe;

[0006] The drive mechanism includes a motor, which is fixedly connected to the right side wall of the evaporator, and a reciprocating lead screw is fixedly connected to the output end of the motor.

[0007] As a further description of the above technical solution:

[0008] The filter assembly includes a filter frame, the outer wall of which contacts a baffle plate, and the filter frame is inserted into the inner wall of the drain pipe.

[0009] As a further description of the above technical solution:

[0010] The baffle plate is rotatably connected to the inner wall of the filter frame.

[0011] As a further description of the above technical solution:

[0012] The scraper is disposed on the outer wall of the reciprocating lead screw.

[0013] As a further description of the above technical solution:

[0014] The scraper is slidably connected to the inner wall of the evaporator.

[0015] As a further description of the above technical solution:

[0016] The reciprocating lead screw passes through and is rotatably connected to the inner wall of the support plate.

[0017] As a further description of the above technical solution:

[0018] The outer wall of the ring tube is provided with multiple sets of circular tubes, which are evenly distributed on the inner wall of the evaporator.

[0019] This utility model has the following beneficial effects:

[0020] 1. In this utility model, by combining hot air and mechanical defrosting, the heat generated by the compressor is used to provide a heat source for the hot air in the U-shaped tube. When the hot air circulates, it transfers heat to the surroundings to accelerate the melting of the frost layer. At the same time, the motor drives the reciprocating screw to drive the scraper to scrape the frost off the inner wall of the evaporator and the surface of the heat exchange tube. The dual effect improves the defrosting efficiency. In addition, the air pump blows air into the ring tube to make the hot air evenly distributed in the evaporator, ensuring that the entire evaporator is fully heated and ensuring the uniformity of the defrosting effect.

[0021] 2. In this utility model, a filter assembly is provided through the drain pipe at the bottom of the evaporator. The filter screen on the filter frame can filter impurities in the water after defrosting, which facilitates subsequent liquid treatment. Moreover, the filter frame and the drain pipe are installed in a sealed manner to ensure the airtightness of the evaporator. When it is necessary to clean the filter screen, the filter frame can be easily pulled out for cleaning by manually rotating the baffle plate. The operation is simple and the maintenance is convenient. Attached Figure Description

[0022] Figure 1 This is a three-dimensional schematic diagram of the evaporator of a defrosting mechanism for a refrigeration unit proposed in this utility model;

[0023] Figure 2 This is a schematic cross-sectional view of the evaporator of a defrosting mechanism for a refrigeration unit proposed in this utility model;

[0024] Figure 3 This is a schematic diagram showing the reciprocating lead screw and scraper of a defrosting mechanism for a refrigeration unit proposed in this utility model;

[0025] Figure 4This is a schematic diagram of a U-shaped tube for a defrosting mechanism in a refrigeration unit according to the present invention;

[0026] Figure 5 This is a schematic diagram showing the ring pipe of a defrosting mechanism for a refrigeration unit proposed in this utility model;

[0027] Figure 6 This is a cross-sectional schematic diagram of the drain pipe of a defrosting mechanism for a refrigeration unit proposed in this utility model.

[0028] Legend:

[0029] 1. Evaporator; 2. Motor; 3. Reciprocating lead screw; 4. Scraper; 5. Support plate; 6. U-tube; 7. Air injection valve; 8. Air exhaust valve; 9. Ring pipe; 10. Gas pipe; 11. Drain pipe; 12. Filter frame; 13. Baffle plate. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] Reference Figures 1-3This utility model provides an embodiment of a defrosting mechanism for a refrigeration unit, including an evaporator 1. A driving mechanism is provided on the right side wall of the evaporator 1, and a scraper 4 is provided on the outer wall of the driving mechanism. The inner wall of the scraper 4 has textures corresponding to the reciprocating screw 3, allowing the scraper 4 to move laterally along the outer wall of the reciprocating screw 3. A support plate 5 is fixedly connected to the inner wall of the evaporator 1. The support plate 5 mainly supports and connects the heat exchange tubes inside the evaporator 1. It is an existing support component and will not be described in detail here. The inner wall of the support plate 5 is through and A U-shaped tube 6 is fixedly connected, allowing hot air to circulate internally. The U-shaped tube 6 is made of aluminum alloy, which has good heat transfer properties. An air injection valve 7 is located at the lower right end of the U-shaped tube 6, connected to the compressor piping of the refrigeration unit. Heat generated by the compressor can be injected into the U-shaped tube 6 through the air injection valve 7. An exhaust valve 8 is located at the upper right end of the U-shaped tube 6. After heat exchange with the air inside the U-shaped tube 6, it can be discharged through the exhaust valve 8. A ring pipe 9 is installed on the outer wall of the evaporator 1. The inner wall of evaporator 1 has a slot that communicates with the ring pipe 9, allowing the ring pipe 9 to transfer gas into evaporator 1 to disturb the internal air and ensure that hot air is evenly distributed within evaporator 1. The outer wall of the ring pipe 9 is equipped with a gas pipe 10, which connects to an existing air pump. Gas can be blown into evaporator 1 using the existing air pump. A drain pipe 11 is located at the bottom of evaporator 1. Water condensed after defrosting can be drained through the drain pipe 11 to prevent water from corroding the interior of evaporator 1. The inner wall of the drain pipe 11 is equipped with a filter. The component has a round cap at the bottom of the drain pipe 11, and the round pipe is connected to the drain pipe 11 by an existing sealing method and is installed at the drain pipe 11 by a thread. The round cap can be opened when drainage is needed, which affects the sealing of the evaporator 1. The drive mechanism includes a motor 2, which is fixedly connected to the right side wall of the evaporator 1. The output end of the motor 2 is fixedly connected to a reciprocating screw 3. The reciprocating screw 3 is a mechanical transmission component that can convert rotary motion into linear reciprocating motion. This is existing technology and will not be described in detail here.

[0032] Reference Figure 3 and Figure 6 The filter assembly includes a filter frame 12 with a filter screen to filter impurities in the liquid, facilitating subsequent liquid treatment. A baffle plate 13 contacts the outer wall of the filter frame 12. The filter frame 12 is inserted into the inner wall of the drain pipe 11, and the insertion point of the filter frame 12 is sealed to the drain pipe 11 using existing sealing methods to ensure that the sealing of the evaporator 1 itself is not affected. The baffle plate 13 is rotatably connected to the inner wall of the filter frame 12. The rotating part of the baffle plate 13 and the filter frame 12 is made of hard rubber material, providing a certain amount of friction. The baffle plate 13 needs to be manually rotated to either block or unblock the filter frame 12.

[0033] Reference Figure 2 , Figure 3 and Figure 4 The scraper 4 is set on the outer wall of the reciprocating screw 3. The scraper 4 is made of aluminum alloy and can receive the heat energy transferred from the U-shaped tube 6. The scraper 4 is used to transfer the heat energy to the inner wall of the evaporator 1 and the internal heat exchange tube. The scraper 4 is slidably connected to the inner wall of the evaporator 1. The scraper 4 matches the inner wall of the evaporator 1. The scraper 4 has protrusions that match the slots of the evaporator 1, which allows the scraper 4 to move laterally along the inner wall of the evaporator 1. The scraper 4 has multiple slots for heat exchange tubes, which allows the scraper 4 to scrape off the frost on the surface of the heat exchange tubes. The scraper 4 has several large holes to ensure that hot air can circulate on both sides inside the evaporator 1. The reciprocating screw 3 is connected to the inner wall of the support plate 5 through and rotates.

[0034] Reference Figure 1 and Figure 5 Multiple sets of circular tubes are arranged on the outer wall of the ring tube 9. These multiple sets of circular tubes are evenly distributed on the inner wall of the evaporator 1. The ring tube 9 is also sealed with the evaporator 1 using the existing sealing method to ensure the airtightness of the evaporator 1.

[0035] Working principle: When defrosting the evaporator 1, the heat generated by the running compressor can be injected into the U-tube 6 through the air injection valve 7 connected to its pipe. The hot air circulates within the U-tube 6. As the hot air flows within the U-tube 6, the heat is transferred to the surrounding air and the heat exchange tubes inside the evaporator 1, further accelerating the melting of the frost layer. After heat exchange is complete, the air that has lost heat is discharged through the exhaust valve 8. At this time, the motor 2 is turned on, causing the output end of the motor 2 to drive the reciprocating screw 3 to start rotating. Due to the texture of the inner wall of the scraper 4... The scraper 4 is matched with the reciprocating screw 3. Driven by the reciprocating screw 3, the scraper 4 moves in a horizontal straight reciprocating motion along the inner wall of the evaporator 1. The scraper 4 can be used to defrost the inner wall of the evaporator 1 and the surface of the heat exchange tubes inside. At the same time, the air pump is turned on to blow air into the ring pipe 9 through the air pipe 10. Multiple sets of round pipes evenly distributed on the ring pipe 9 transfer the gas into the evaporator 1, disturbing the internal air and making the hot air evenly distributed in the evaporator 1. This ensures that the entire evaporator 1 can be fully heated and improves the uniformity of the defrosting effect.

[0036] Finally, the water formed after the frost melts will flow downwards under the action of gravity and be discharged through the drain pipe 11 at the bottom of the evaporator 1. The filter screen on its filter frame 12 can filter impurities in the liquid, which is convenient for subsequent liquid treatment. When it is necessary to clean the filter screen, the baffle plate 13 is manually rotated so that it no longer blocks the filter frame 12, and the filter frame 12 can be pulled out for cleaning; the installation method is the same.

[0037] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A defrosting mechanism for a refrigerating unit comprising an evaporator (1), characterized in that: The right end side wall of the evaporimeter (1) is provided with a driving mechanism, the outer wall of the driving mechanism is provided with a scraper (4), the inner wall of the evaporimeter (1) is fixedly connected with a support plate (5), the inner wall of the support plate (5) is through and fixedly connected with a U-shaped pipe (6), the right lower end of the U-shaped pipe (6) is provided with an air injection valve (7), the right upper end of the U-shaped pipe (6) is provided with an air exhaust valve (8), the outer wall of the evaporimeter (1) is installed with a ring pipe (9), the outer wall of the ring pipe (9) is provided with an air pipe (10), the bottom end of the evaporimeter (1) is provided with a drain pipe (11), and the inner wall of the drain pipe (11) is provided with a filter assembly. The driving mechanism comprises a motor (2), the motor (2) is fixedly connected to the right end side wall of the evaporimeter (1), and the output end of the motor (2) is fixedly connected with a reciprocating screw rod (3).

2. A defrosting mechanism for a refrigeration unit as defined in claim 1, characterized in that: The filter assembly comprises a filter frame (12), the outer wall of the filter frame (12) is in contact with a shielding plate (13), and the filter frame (12) is inserted on the inner wall of the drain pipe (11).

3. A defrosting mechanism for a refrigeration unit as defined in claim 2, characterized in that: The shielding plate (13) is rotationally connected to the inner wall of the filter frame (12).

4. A defrosting mechanism for a refrigeration unit as defined in claim 1, wherein: The scraper (4) is arranged on the outer wall of the reciprocating screw rod (3).

5. A defrosting mechanism for a refrigeration unit as defined in claim 1, wherein: The scraper (4) is slidingly connected to the inner wall of the evaporimeter (1).

6. A defrosting mechanism for a refrigeration unit as defined in claim 1, wherein: The reciprocating screw rod (3) is through and rotationally connected to the inner wall of the support plate (5).

7. A defrosting mechanism for a refrigeration unit as defined in claim 1, wherein: The outer wall of the ring pipe (9) is provided with a plurality of circular pipes, and the plurality of circular pipes are uniformly distributed on the inner wall of the evaporimeter (1).

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