A frost-free air duct for a display cabinet and a display cabinet

Abstract

The application discloses a frost-free air duct for a display cabinet and the display cabinet, which comprises at least two air doors, a boss, a positive frosting plate, a heating plate and a drainage assembly. The boss is provided with a groove matched with the air door. The bottom of the groove is provided with a drainage port. The inner wall of the groove is provided with the positive frosting plate. The position matched with the groove on the outer side of the air door is provided with the heating plate. The air door slides up and down. The application realizes positive frosting and air duct complementary defrosting, does not affect the normal refrigeration of the system, realizes frost-free refrigeration of the evaporator, and solves the problem that the temperature in the cabinet rises during defrosting in the prior art.

Description

Technical Field

[0001] This invention relates to the field of refrigeration equipment technology, and in particular to a frost-free air duct for display cabinets and a display cabinet. Background Technology

[0002] Commercial display cases can be divided into two types based on their cooling methods: direct-cooling display cases and air-cooling display cases. Air-cooling display cases use an evaporator fan to force cool air into the cabinet through ducts for circulation. Compared to traditional direct-cooling display cases, air-cooling display cases offer faster and more uniform cooling. However, existing vertical air-cooling display cases still have shortcomings. Firstly, their structure consists of an air inlet, an evaporator fan, an evaporator, and an air outlet. The evaporator fan draws in air, which is cooled by the evaporator, and then the cool air is blown out through the outlet. This untreated air directly exchanges heat with the evaporator, causing frost to form on the evaporator surface, which over time affects heat exchange efficiency. Secondly, most current defrosting methods use heating, which prevents cooling during the defrosting process, causing the cabinet to warm up and posing a risk of goods melting. Summary of the Invention

[0003] In order to overcome the above-mentioned problems in the prior art, the present invention proposes a frost-free air duct for display cabinets and a display cabinet.

[0004] The technical solution adopted by the present invention to solve its technical problem is: a frost-free air duct for display cabinets, including at least two air doors, a boss, an active frosting plate, a heating plate, and a drainage component. The boss is provided with a groove that cooperates with the air door. The bottom of the groove is provided with a drain outlet. The inner wall of the groove is provided with an active frosting plate. The outer side of the air door is provided with a heating plate at a position that cooperates with the groove. The air door slides up and down.

[0005] The above-mentioned frost-free air duct for display cabinets includes a refrigeration pipe on the active frosting plate. One end of the refrigeration pipe is connected to the condenser outlet via a connecting pipe, and the other end is connected to the compressor inlet. A solenoid valve is installed on the connecting pipe.

[0006] The above-mentioned frost-free air duct for display cabinets has multiple cooling pipes connected in parallel for the active frosting plates.

[0007] In the aforementioned frost-free air duct for a display cabinet, the air damper is installed on the top of the display cabinet body via an air damper bracket, and the air damper slides up and down along the air damper bracket via a drive mechanism.

[0008] In the aforementioned frost-free air duct for display cabinets, the air door bracket is provided with a guide groove, and the air door is provided with a slider. The slider cooperates with the guide groove and slides up and down along the guide groove.

[0009] The above-mentioned frost-free air duct for display cabinets has an inverted triangular structure below the air door, heating plates installed on both sides of the inverted triangular structure, and an air duct in the middle of the air door body.

[0010] In the aforementioned frost-free air duct for a display cabinet, the drain outlet is connected to a drain pipe.

[0011] A display case comprising a frost-free air duct as described in any of the preceding claims.

[0012] The beneficial effects of this invention are that the air-cooled frost-free solution proposed in this patent can achieve active frosting and complementary defrosting of the air duct without affecting the normal cooling of the system, thus achieving frost-free cooling of the evaporator; multiple defrosting chambers can achieve group defrosting, and when defrosting heating is performed, the damper is lowered to the bottom to form a sealed space, reducing the impact of temperature rise during defrosting; the middle part of the damper body is the air duct, and when the damper is raised, the air duct is hidden in the upper damper support, and the triangular structure below and the groove below form a cooling air duct. When the damper is lowered, the air duct and the groove in the middle are connected, without affecting the cooling, thus solving the problem of the cabinet temperature rising during defrosting in the prior art, which leads to defrosting. Attached Figure Description

[0013] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0014] Figure 1 This is a schematic diagram of the present invention;

[0015] Figure 2 This is a cross-sectional view of the air circulation between the A-side component and the B-side component during frosting in an embodiment of the present invention.

[0016] Figure 3 This is a cross-sectional view of the defrosting airflow of the A-side component and the frosting airflow of the B-side component in an embodiment of the present invention.

[0017] Figure 4 This is a schematic diagram of the damper in an embodiment of the present invention;

[0018] Figure 5 This is a schematic diagram of the refrigeration principle of the present invention.

[0019] In the diagram: 1. Active frosting plate B, 2. Active frosting plate A, 3. Three-way solenoid valve ST2, 4. Evaporator, 5. Compressor, 6. Liquid receiver, 7. Condenser, 8. Three-way valve ST1, 9. Dryer filter, 10. Capillary tube, 11. Display case body, 12. Damper B, 13. Drain outlet B, 14. Drain outlet A, 15. Evaporator fan, 16. Damper A, 17. Air duct, 18. Heating plate A, 19. Heating plate B. Detailed Implementation

[0020] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] like Figure 1 As shown, this embodiment discloses a frost-free air duct for a display cabinet, specifically including at least two dampers, a boss, an active frosting plate, a heating plate, and a drainage assembly. The boss has a groove that mates with the damper, and a drain outlet is located at the bottom of the groove, connected to a drain pipe. The active frosting plate is installed on the inner wall of the groove, and a heating plate is installed on the outer side of the damper at a position that mates with the groove. A refrigeration pipe is installed on the active frosting plate, with one end connected to the condenser outlet via a connecting pipe and the other end connected to the compressor inlet. A solenoid valve is installed on the connecting pipe to control the refrigeration of the pipe. The refrigeration pipes of multiple active frosting plates are connected in parallel.

[0022] The damper is mounted on the top of the display case body 11 via a damper bracket. The damper slides up and down along the damper bracket via a drive mechanism. The damper bracket has a guide groove, and the damper has a slider that engages with the guide groove. The damper is driven by the drive mechanism to slide up and down along the guide groove. Figure 4 As shown, the bottom of the damper has an inverted triangular structure, with heating plates installed on both sides of the inverted triangular structure, and an air duct 17 is provided in the middle of the damper body.

[0023] In this embodiment, the driving mechanism is a hydraulic cylinder.

[0024] In this embodiment, two dampers are included, namely damper A16 and damper B12. A heating plate A18 is installed on the lower outer side of damper A16. An active frosting plate A2 is installed on the side wall of the groove A corresponding to damper A. A drain outlet A14 is provided at the bottom of groove A. A heating plate B19 is installed on the lower outer side of damper B12. An active frosting plate B1 is installed on the side wall of the groove B corresponding to damper B. A drain outlet B13 is provided at the bottom of groove B. Both drain outlet A and drain outlet B are connected to a drain pipe.

[0025] The refrigeration principle of this embodiment is as follows: Figure 5As shown, the evaporator, active frosting plate A, and active frosting plate B are connected in parallel. The refrigerant enters the condenser 7 from the compressor 5 outlet through the receiver 6. From the condenser outlet, it splits into three paths: one connected to the evaporator, one connected to the active frosting plate A, and one connected to the active frosting plate B. Finally, the three refrigerant paths converge and return to the compressor. The inlets of the evaporator, active frosting plate A, and active frosting plate B are all connected to the dryer filter 9 and the capillary tube 10. (1) Active frosting plate A2 is frosted, and active frosting plate B1 is defrosted. The left and lower valves of the three-way solenoid valve (ST1) 8 are open, and the upper valve is closed. The right and lower valves of the three-way solenoid valve (ST2) 3 are open, and the upper valve is closed. At this time, the refrigerant flows from the active frosting plate A2 and the evaporator 4. Active frosting plate A2 is refrigerated, evaporator 4 is refrigerated, and active frosting plate B1 is not refrigerated.

[0026] (2) Active frosting plate A2 defrosts, while active frosting plate B1 frosts. The lower and upper valves of three-way solenoid valve (ST1) 8 are open, and the left valve is closed. The upper and lower valves of three-way solenoid valve (ST2) 3 are open, and the right valve is closed. At this time, refrigerant flows from active frosting plate B1 and evaporator 4. Active frosting plate B1 cools, evaporator 4 cools, and active frosting plate A does not cool.

[0027] The specific working process of this embodiment is as follows:

[0028] like Figure 2 As shown, the A-side component is frosted, and the B-side component is defrosted.

[0029] Evaporator fan 15 operates normally, evaporator 4 operates normally, damper A rises to the top position, its heating plate does not work, and active frosting plate A cools; damper B falls to the bottom position, heating plate B works, active frosting plate B does not cool, a sealed cavity is formed between damper B and groove B, heating defrosts, and water is drained from drain outlet B. The middle part of damper B is the air duct 17. When damper B falls to the bottom position, the air duct of damper B connects with the air duct of component A, and the system air duct cools normally.

[0030] like Figure 3 As shown, the A-side module is defrosted, and the B-side module is frosted.

[0031] Evaporator fan 15 operates normally, evaporator 4 operates normally, damper A is lowered to the bottom position, its heating plate is working, and active frosting plate A is not cooling; damper B is raised to the top position, its heating plate is not working, and active frosting plate B is cooling. A sealed cavity is formed between damper A and groove A, which is heated for defrosting, and water is drained from drain port A. The middle part of the main body of damper A is the air duct. When damper A is lowered to the bottom position, its air duct connects with the air duct of the component on side B, and the system air duct is cooling normally.

[0032] In addition, the display case may include multiple air vents and corresponding grooves. When three or more air vents are installed, the multiple air vents work together to raise and lower to ensure normal cooling inside the display case.

[0033] This embodiment also discloses a display cabinet, including the aforementioned frost-free air duct.

[0034] The above embodiments are merely exemplary embodiments of the present invention and are not intended to limit the present invention. The scope of protection of the present invention is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to the present invention within its spirit and scope of protection, and such modifications or equivalent substitutions should also be considered to fall within the scope of protection of the present invention.

Claims

1. A frost-free air duct for display cases, characterized in that: It includes at least two dampers, a boss, at least two active frosting plates, a heating plate, and a drainage assembly. The boss is provided with a groove that mates with the damper. The bottom of the groove is provided with a drain outlet. The inner wall of the groove is provided with an active frosting plate. The outer side of the damper is provided with a heating plate that mates with the groove. The damper can slide up and down. The active frosting plate is equipped with a refrigeration pipeline. One end of the refrigeration pipeline is connected to the condenser outlet via a connecting pipe, and the other end is connected to the compressor inlet. A solenoid valve is installed on the connecting pipe. The refrigeration piping of multiple active frosting plates is connected in parallel with the evaporator; An air duct is provided in the middle of the damper body.

2. The frost-free air duct for a display cabinet according to claim 1, characterized in that, The damper is installed on the top of the display case via a damper bracket, and the damper slides up and down along the damper bracket via a drive mechanism.

3. The frost-free air duct for a display cabinet according to claim 2, characterized in that, The damper bracket is provided with a guide groove, and the damper is provided with a slider. The slider cooperates with the guide groove and slides up and down along the guide groove.

4. The frost-free air duct for a display cabinet according to claim 1, characterized in that, The damper has an inverted triangular structure below it, and heating plates are installed on both sides of the inverted triangular structure.

5. A frost-free air duct for a display cabinet according to claim 1, characterized in that, The drain outlet is connected to the drain pipe.

6. A display cabinet, characterized in that, Includes the frost-free air duct as described in any one of claims 1-5.

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