Waterproof sealing structure of air compressor

Abstract

The utility model discloses a waterproof sealing structure of an air compressor, which belongs to the technical field of fuel cell air compressors and comprises a main shaft, a movable ring, a sealing ring and a static back plate. The movable ring is arranged on the outer side of the main shaft, and a blocking structure is arranged in the middle of the movable ring; the sealing ring comprises an inner sealing ring and an outer sealing ring, and the inner sealing ring and the outer sealing ring are installed on the two sides of the blocking structure; the static back plate is arranged on the outer side of the movable ring and tightly attached to the inner sealing ring and the outer sealing ring, and a drainage channel is formed in the static back plate. An annular sealing cavity is formed among the movable ring, the inner sealing ring, the outer sealing ring and the static back plate, the drainage channel is connected with the sealing cavity, and high-temperature and high-pressure gas is introduced into the drainage channel. The air compressor sealing device is simple in structure and convenient to use, adopts a double-sealing combined structure of the sealing ring and the air pressure seal, ensures the dynamic and static sealing effects of the air compressor, and can effectively prevent external water from entering the motor and prevent water vapor from entering the motor.

Description

Technical Field

[0001] This utility model relates to the field of fuel cell air compressor technology, specifically to a waterproof sealing structure for an air compressor. Background Technology

[0002] A fuel cell is a clean energy device that directly converts the chemical energy of fuel (such as hydrogen) and oxidant (such as oxygen) into electrical energy through an electrochemical reaction. Its core principle is based on the reaction of hydrogen and oxygen to produce water, releasing electrical and thermal energy in the process. Compared to traditional internal combustion engines, fuel cells have significant advantages such as high efficiency (theoretically exceeding 60%), zero emissions (only water is emitted), and low noise, and are considered a key technology for future transportation, distributed power generation, and energy storage.

[0003] A typical proton exchange membrane fuel cell (PEMFC) consists of bipolar plates, a membrane electrode assembly (MEA), and a gas diffusion layer. Hydrogen undergoes oxidation at the anode catalyst layer to generate protons and electrons, while oxygen combines with protons and electrons at the cathode catalyst layer to form water. To ensure efficient reaction, a continuous supply of high-purity compressed air is required at the cathode to provide sufficient oxygen, and airflow is used to remove the generated water and waste heat.

[0004] As a core component of the fuel cell air supply system, the air compressor performs multiple key functions:

[0005] 1. Oxygen supply: The oxygen partial pressure is increased by compressing ambient air, which promotes the driving force of the cathode reaction;

[0006] 2. Hydrothermal management: Control the humidity of the fuel cell stack to prevent the membrane electrode from dehydrating or being flooded;

[0007] 3. Heat dissipation assistance: Accelerates the removal of residual heat through airflow circulation.

[0008] During the operation of an air compressor, the sealing performance of the vortex end directly affects efficiency and reliability. Due to the unique operating conditions of fuel cell systems, water is continuously generated at the vortex end, posing a significant challenge to this component. Currently, common sealing structures employ toothed seals or pressure differential sealing. Both of these solutions require a certain rotational speed to achieve a dynamic seal. During shutdown, as the rotational speed decreases, the pressure differential cannot be effectively established, easily leading to water leakage. Utility Model Content

[0009] The purpose of this utility model is to provide a waterproof sealing structure for an air compressor to solve the above-mentioned problems and effectively prevent moisture from entering the motor under any circumstances.

[0010] Technical Solution: This utility model provides a waterproof sealing structure for an air compressor, comprising: a main shaft, a rotating ring, a sealing ring, and a static back plate; the rotating ring is disposed on the outside of the main shaft, and a blocking structure is provided in the middle of the rotating ring; the sealing ring includes an inner sealing ring and an outer sealing ring, which are installed on both sides of the blocking structure; the static back plate is disposed on the outside of the rotating ring and is tightly fitted with the inner and outer sealing rings, and a drainage channel is provided on the static back plate; an annular sealing cavity is formed between the rotating ring, the inner sealing ring, the outer sealing ring, and the static back plate, and the drainage channel connects to the sealing cavity and introduces high-temperature and high-pressure gas.

[0011] Furthermore, in the aforementioned waterproof sealing structure for an air compressor, the moving ring has a horn-shaped structure with an outward opening on the side near the outer sealing ring.

[0012] Furthermore, in the aforementioned waterproof sealing structure for an air compressor, the main shaft and the rotating ring are fitted with an interference fit.

[0013] Furthermore, in the aforementioned waterproof sealing structure for an air compressor, the gas temperature introduced through the drainage channel is not lower than 50°C, and the pressure is not lower than the pressure on the outer side of the outer sealing ring.

[0014] Furthermore, in the aforementioned waterproof sealing structure for an air compressor, the gas pressure introduced through the drainage channel is 0.8-0.9 times the working pressure.

[0015] Furthermore, in the aforementioned waterproof sealing structure for an air compressor, the openings of the inner sealing ring and the outer sealing ring are misaligned by 180°.

[0016] Furthermore, in the aforementioned waterproof sealing structure for an air compressor, the cross-sectional width of the sealing cavity is three times the width of the sealing ring.

[0017] Furthermore, in the aforementioned waterproof sealing structure for an air compressor, the blocking structure is a recessed groove-shaped structure, and there is at least one such structure.

[0018] As can be seen from the above technical solution, this utility model has the following beneficial effects: The waterproof sealing structure for an air compressor described in this utility model has a simple structure and is easy to use. It adopts a double sealing combination structure of sealing ring and air pressure sealing, which ensures the sealing effect of the air compressor under both dynamic and static conditions. The sealing ring adopts a double-layer sealing, and the openings of the two sealing rings are offset by 180 degrees. Under static conditions, if there is water in the volute, it can achieve a waterproof effect. High-temperature and high-pressure gas is introduced into the sealing cavity, which creates a near-closed airtight cavity under dynamic conditions, effectively preventing external water from entering. A blocking structure is set in the middle of the moving ring to prevent water vapor from entering the motor along the wall. Attached Figure Description

[0019] Figure 1This is a schematic diagram of a waterproof sealing structure for an air compressor according to the present invention.

[0020] In the diagram: 1. Main shaft; 2. Moving ring; 3. Sealing ring; 4. Static back plate; 5. Sealing cavity; 21. Blocking structure; 22. Horn structure; 31. Inner sealing ring; 32. Outer sealing ring; 41. Drainage channel. Detailed Implementation

[0021] Example 1

[0022] like Figure 1 The illustrated waterproof sealing structure for an air compressor includes: a main shaft 1, a rotating ring 2, a sealing ring 3, and a static back plate 4. The rotating ring 2 is located on the outside of the main shaft 1, and a blocking structure 21 is provided in the middle of the rotating ring 2. The sealing ring 3 includes an inner sealing ring 31 and an outer sealing ring 32, which are installed on both sides of the blocking structure 21. The static back plate 4 is located on the outside of the rotating ring 2 and is in close contact with the inner sealing ring 31 and the outer sealing ring 32. A drainage channel 41 is provided on the static back plate 4. An annular sealing cavity 5 is formed between the rotating ring 2, the inner sealing ring 31, the outer sealing ring 32, and the static back plate 4. The drainage channel 41 connects to the sealing cavity 5 and introduces high-temperature and high-pressure gas.

[0023] In this embodiment, the main shaft 1 and the moving ring 2 are fitted with an interference fit. This makes them form an integral structure. The interference fit surfaces can form a tight fit without gaps, which can effectively prevent moisture from entering the interior.

[0024] In this embodiment, the moving ring 2 is provided with a horn structure 22 with an external opening on the side near the outer sealing ring 32. The horn structure 22 can directly guide away most of the water vapor.

[0025] Example 2

[0026] Based on Example 1, in this example, as... Figure 1 The air compressor waterproof sealing structure shown has a gas temperature of not less than 50°C and a pressure of not less than the outer pressure of the outer sealing ring 32 introduced by the drainage channel 41. The gas pressure introduced by the drainage channel 41 is 0.8-0.9 times the working pressure, which can effectively prevent external water vapor from entering.

[0027] In this embodiment, the openings of the inner sealing ring 31 and the outer sealing ring 32 are misaligned by 180°. Under static conditions, if water remains in the vortex shell, a static waterproofing effect can be achieved.

[0028] In this embodiment, the cross-sectional width of the sealing cavity 5 is three times the width of the sealing ring 3.

[0029] In this embodiment, the blocking structure 21 can be a semi-circular recess or a groove, and the number can be one or more. As a subsequent safeguard, if a small amount of water vapor enters the sealing cavity 5 through the sealing ring 3, the blocking structure 21 is used to divide the continuous plane in the middle of the moving ring 2, preventing water vapor from entering the motor through the sealing ring 3 along the surface of the moving ring 2.

[0030] It should be noted that the above description is merely a technical solution of the utility model and not a limitation. Although the present utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of the utility model without departing from the scope of the present utility model, and all such modifications and substitutions should be covered within the scope of the claims of the present utility model.

Claims

1. A waterproof sealing structure for an air compressor, characterized in that: include: Main spindle (1); A rotating ring (2) is provided on the outside of the main shaft (1), and a blocking structure (21) is provided in the middle of the rotating ring (2); A sealing ring (3) is provided, comprising an inner sealing ring (31) and an outer sealing ring (32), wherein the inner sealing ring (31) and the outer sealing ring (32) are mounted on both sides of the blocking structure (21); A static back plate (4) is provided on the outside of the moving ring (2) and is tightly fitted with the inner sealing ring (31) and the outer sealing ring (32). A drainage channel (41) is provided on the static back plate (4). The moving ring (2), inner sealing ring (31), outer sealing ring (32) and static back plate (4) form an annular sealing cavity (5), and the drainage channel (41) connects to the sealing cavity (5) and introduces high temperature and high pressure gas.

2. The waterproof sealing structure for an air compressor according to claim 1, characterized in that: The moving ring (2) has a horn structure (22) with an outward opening on the side near the outer sealing ring (32).

3. The waterproof sealing structure for an air compressor according to claim 1, characterized in that: The main shaft (1) and the moving ring (2) are fitted with an interference fit.

4. The waterproof sealing structure for an air compressor according to claim 1, characterized in that: The gas temperature introduced through the drainage channel (41) is not lower than 50°C and the pressure is not lower than the pressure outside the outer sealing ring (32).

5. The waterproof sealing structure for an air compressor according to claim 1, characterized in that: The gas pressure introduced by the drainage channel (41) is 0.8-0.9 times the working pressure.

6. The waterproof sealing structure for an air compressor according to claim 1, characterized in that: The openings of the inner sealing ring (31) and the outer sealing ring (32) are misaligned by 180°.

7. The waterproof sealing structure for an air compressor according to claim 1, characterized in that: The width of the cross-section of the sealing cavity (5) is three times the width of the sealing ring (3).

8. The waterproof sealing structure for an air compressor according to claim 1, characterized in that: The blocking structure (21) is a concave groove-shaped structure, and there is at least one such structure.

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