Air compressor sealing structure and air compressor

Abstract

The application belongs to the technical field of electrical equipment, and discloses an air compressor sealing structure and an air compressor. The air compressor sealing structure comprises a connecting sleeve, a first gas seal assembly and a second gas seal assembly. The connecting sleeve is sleeved on the rotating shaft of the air compressor, and has opposite first and second ends. The first gas seal assembly is arranged at the first end, and is sleeved on the rotating shaft and connected with the bearing of the rotating shaft to seal the gap between the first end and the rotating shaft by means of sealing gas. The second gas seal assembly is arranged between the connecting sleeve and the rotating shaft and at the second end to seal the gap between the second end and the rotating shaft by means of water vapor. The connecting sleeve is provided with an exhaust hole between the first gas seal assembly and the second gas seal assembly. In this way, the possibility of gas contacting the bearing is reduced, and the possibility of damage to the bearing is reduced, thereby effectively improving the reliability of the air compressor sealing structure and enabling the air compressor to operate reliably for a long time.

Description

Technical Field

[0001] This invention relates to the field of electrical equipment technology, and in particular to an air compressor sealing structure and an air compressor. Background Technology

[0002] An air compressor, also known as an air compressor, is a device used to compress gases. Air compression is used in many fields, such as refrigerators, air conditioners, and gas stations. The air compressor compresses air primarily by having an electric motor drive a crankshaft to rotate, causing changes in the cylinder volume and thus altering the air pressure.

[0003] In existing technology, air compressors used in the steam field mainly consist of a casing, a shaft, and a turbine. The shaft is connected to the casing via bearings, and the turbine is located at the end of the rotor furthest from the bearings. A sealing ring or similar structure is installed at the end of the shaft near the turbine to form a seal and prevent the flow of steam.

[0004] However, when the air compressor is running, the rotation of the shaft can easily create gaps between the seal and the shaft. Water vapor can then flow into the casing through these gaps and come into contact with the bearings, causing the bearings to be in a high-humidity environment. Over time, this can lead to bearing corrosion, causing air compressor failure and making it difficult for the air compressor to operate reliably for a long period of time. Summary of the Invention

[0005] The purpose of this invention is to provide an air compressor sealing structure and an air compressor, which solves the problem that in the prior art and in the field of steam, air compressors are prone to bearing corrosion due to insufficient sealing, and the bearings are in a high humidity environment for a long time, which leads to air compressor failure and makes it difficult for the air compressor to operate reliably for a long time.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] An air compressor sealing structure includes: a connecting sleeve, a first air seal assembly, and a second air seal assembly. The connecting sleeve is sleeved on the rotating shaft of the air compressor, and the connecting sleeve has a first end and a second end opposite to each other. The first air seal assembly is disposed at the first end of the connecting sleeve, and is sleeved on the rotating shaft and connected to a bearing of the rotating shaft to seal the gap between the first end of the connecting sleeve and the rotating shaft with a sealing gas. The second air seal assembly is disposed between the connecting sleeve and the rotating shaft and located at the second end of the connecting sleeve to seal the gap between the second end of the connecting sleeve and the rotating shaft with water vapor. The connecting sleeve has an exhaust port located between the first air seal assembly and the second air seal assembly.

[0008] Optionally, the first air seal assembly includes: an air pressure sealing disc sleeved on the rotating shaft, the air pressure sealing disc having an air pressure chamber inside; an air injection pipe, one end of which communicates with the air pressure chamber and the other end of which extends out of the connecting sleeve for connection with an air injection device; and a plurality of comb teeth disposed on the side of the air pressure sealing disc near the rotating shaft, with an air seal groove communicating with the air pressure chamber formed between two adjacent comb teeth.

[0009] Optionally, a bearing housing is provided on the outside of the bearing, and the pneumatic sealing disc is fixed on the bearing housing.

[0010] Optionally, the air compressor sealing structure further includes a rotating sealing disc, fixed to the rotating shaft and located between the first air seal assembly and the bearing.

[0011] Optionally, the air compressor sealing structure further includes: a fan blade disposed on the side of the rotating sealing disc near the first air seal assembly.

[0012] Optionally, multiple fan blades are distributed circumferentially around the rotating sealing disk.

[0013] Optionally, the first gas seal assembly includes: a sealing carbon ring sleeved on the rotating shaft, wherein an air pressure sealing gap is formed between the inner sidewall of the sealing carbon ring and the outer sidewall of the rotating shaft, and an air guide hole communicating with the air pressure sealing gap is provided in the sealing carbon ring, the air guide hole being used to communicate with an air injection device.

[0014] Optionally, an exhaust chamber is provided between the connecting sleeve and the rotating shaft, which communicates with the air pressure sealing gap and the exhaust hole respectively, and the exhaust chamber is located between the first air seal assembly and the second air seal assembly.

[0015] An air compressor includes: a housing, a rotating shaft, and an air compressor sealing structure as described in any one of the above descriptions. The rotating shaft is rotatably connected to the housing; the air compressor sealing structure is disposed on the rotating shaft and connected to the housing.

[0016] Optionally, the air compressor further includes: an impeller disposed on the rotating shaft; and a back plate disposed on the impeller and connected to the connecting sleeve of the air compressor sealing structure.

[0017] The beneficial effects of this invention are:

[0018] By installing a first air-sealing assembly and a second air-sealing assembly at the first and second ends of the connecting sleeve, respectively, an air seal is formed between the first end of the connecting sleeve and the rotating shaft through sealing gas, while a seal is formed between the second end of the connecting sleeve and the rotating shaft through water vapor. During operation, this air compressor sealing structure allows water vapor to block gas flow, reducing the possibility of gas entering the connecting sleeve. Excess water vapor is further blocked by the sealing gas, ensuring it can only exit the connecting sleeve through the exhaust port. This reduces the possibility of gas contacting the bearing, lowering the likelihood of bearing damage and effectively improving the reliability of the air compressor sealing structure.

[0019] The air compressor adopts this air compressor sealing structure, in which water vapor outside the connecting sleeve is blocked by the water vapor of the second air seal component, while the first air seal component can block the water vapor used by the second air seal component, so that water vapor entering the connecting sleeve can only be discharged through the exhaust port, effectively reducing the possibility of water vapor coming into contact with the bearing, reducing the possibility of bearing corrosion and causing air compressor failure, and enabling the air compressor to operate reliably for a long time. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of an air compressor in some embodiments of the present invention.

[0021] Figure 2 for Figure 1 An enlarged view of part A in the implementation shown.

[0022] In the picture:

[0023] 100. Connecting sleeve; 110. First end; 120. Second end; 130. Exhaust port; 140. Exhaust chamber; 150. Air injection port; 200. First air seal assembly; 210. Air pressure sealing disc; 220. Air injection pipe; 230. Comb teeth; 240. Air pressure chamber; 250. Air seal groove; 260. Adapter; 300. Second air seal assembly; 310. Sealing carbon ring; 311. Air guide hole; 320. Air pressure sealing gap; 400. Rotating shaft; 500. Housing; 600. Bearing; 610. Bearing seat; 700. Rotary sealing disc; 710. Fan blade; 800. Impeller; 810. Back plate. Detailed Implementation

[0024] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0025] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0026] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0027] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0028] This invention provides an air compressor sealing structure and an air compressor.

[0029] Figure 1 This is a schematic diagram of the air compressor in some embodiments of the present invention. (Refer to...) Figure 1 As shown, the air compressor sealing structure includes a connecting sleeve 100, a first air seal assembly 200, and a second air seal assembly 300. The connecting sleeve 100 is sleeved on the rotating shaft 400 of the air compressor, and has a first end 110 and a second end 120 opposite to each other. The first air seal assembly 200 is disposed at the first end 110 of the connecting sleeve 100, is sleeved on the rotating shaft 400, and is connected to the bearing 600 of the rotating shaft 400 to seal the gap between the first end 110 of the connecting sleeve 100 and the rotating shaft 400 by sealing gas.

[0030] The second air seal assembly 300 is disposed between the connecting sleeve 100 and the rotating shaft 400 and located at the second end 120 of the connecting sleeve 100, so as to seal the gap between the second end 120 of the connecting sleeve 100 and the rotating shaft 400 by water vapor; wherein, the connecting sleeve 100 has an exhaust hole 130 located between the first air seal assembly 200 and the second air seal assembly 300.

[0031] Specifically, the connecting sleeve 100 is hollow inside to allow the rotating shaft 400 to pass through. The first end 110 of the connecting sleeve 100 is fixedly connected to the housing 500 of the air compressor, while the rotating shaft 400 is rotatably connected to the housing 500 via the bearing 600. The first air seal assembly 200 can be sleeved on the rotating shaft 400 and forms multiple slot-like structures with the rotating shaft 400. High-pressure sealing gas is injected into the multiple slots through the first air seal assembly 200 to form an air seal between the first end 110 of the connecting sleeve 100 and the rotating shaft 400, thereby reducing gas flow to the bearing 600.

[0032] The second end 120 of the connecting sleeve 100 is connected to the turbine assembly of the air compressor. When the air compressor is in use, the turbine assembly contains a large amount of water vapor. The first air seal assembly 200 is located at the first end 110 of the connecting sleeve 100, maintaining a certain gap with the rotating shaft 400. An air seal is formed by filling this gap with water vapor, which reduces the possibility of water vapor flowing into the connecting sleeve 100 from the turbine assembly, ensuring that the pressure of the water vapor in the turbine assembly is not lost, and also prevents other gases from mixing with the water vapor. Excess water vapor in this gap can be directly discharged from the connecting sleeve 100 through the exhaust port 130.

[0033] During the use of this air compressor sealing structure, a first air seal assembly 200 and a second air seal assembly 300 are respectively installed at the first end 110 and the second end 120 of the connecting sleeve 100. This allows a sealing gas to form an air seal between the first end 110 of the connecting sleeve 100 and the rotating shaft 400, while water vapor forms a seal between the second end 120 of the connecting sleeve 100 and the rotating shaft 400. This allows the water vapor to block the flow of gas, reducing the possibility of gas entering the connecting sleeve 100. Excess water vapor is further blocked by the first air seal assembly 200, ensuring that water vapor entering the connecting sleeve 100 can only be discharged through the exhaust port 130. This reduces the possibility of gas contacting the bearing 600, lowering the likelihood of damage to the bearing 600, and thus effectively improving the reliability of the air compressor sealing structure.

[0034] Figure 2 for Figure 1 An enlarged view of part A in the implementation shown. (Refer to...) Figure 1 and Figure 2As shown, in some embodiments of the present invention, the first air seal assembly 200 includes an air pressure sealing disc 210, an air injection pipe 220, and comb teeth 230. The air pressure sealing disc 210 is sleeved on the rotating shaft 400, and an air pressure chamber 240 is provided inside the air pressure sealing disc 210. One end of the air injection pipe 220 communicates with the air pressure chamber 240, and the other end extends out of the connecting sleeve 100 for connection with an air injection device. A plurality of comb teeth 230 are arranged on the side of the air pressure sealing disc 210 near the rotating shaft 400, and an air seal groove 250 communicating with the air pressure chamber 240 is formed between two adjacent comb teeth 230.

[0035] Specifically, the air pressure sealing disc 210 is fixedly connected to the housing 500 by bolts. It is hollow inside and has an adapter 260 on its outer wall. One end of the air injection pipe 220 is connected to the adapter 260, and the other end is connected to the air injection device. The air injection device can be a high-pressure air pump, which can inject high-pressure sealing gas, such as high-pressure air or other inert gas.

[0036] The inner wall of the pneumatic sealing disc 210 maintains a certain distance from the outer wall of the rotating shaft 400, and the comb teeth 230 are disposed within this distance. The comb teeth 230 may be annular, integrally formed with the pneumatic sealing disc 210, and their inner wall slides against the outer wall of the rotating shaft 400. Multiple comb teeth 230 are distributed circumferentially along the rotating shaft 400, and the spacing may be equal or unequal. An annular air-sealing groove 250 is formed between two adjacent comb teeth 230, and the opening of the air-sealing groove 250 faces the outer wall of the rotating shaft 400.

[0037] After high-pressure sealing gas is injected into the air pressure chamber 240 through the air injection device, the sealing gas will enter the air seal groove 250. The opening of the air seal groove 250 is directly opposite the outer wall of the rotating shaft 400. When the air seal groove 250 is filled with high-pressure sealing gas, the sealing gas will also come into full contact with the rotating shaft 400, thereby forming an air seal between the air pressure sealing disc 210 and the rotating shaft 400, so as to effectively seal the gap between the air pressure sealing disc 210 and the rotating shaft 400.

[0038] Reference Figure 1 and Figure 2 As shown, in some embodiments of the present invention, a bearing seat 610 is provided on the outer side of the bearing 600, and a pneumatic sealing disc 210 is fixed on the bearing seat 610. Specifically, the bearing seat 610 is fixed inside the housing 500, and the bearing 600 is rotatably connected inside the bearing seat 610. The side of the pneumatic sealing disc 210 near the housing 500 is tightly attached to the end face of the bearing seat 610 and fixedly connected by bolts, so that the pneumatic sealing disc 210 can be tightly attached to the bearing 600, thereby achieving a better air seal effect on the bearing 600.

[0039] Reference Figure 2As shown, in some embodiments of the present invention, the air compressor sealing structure further includes a rotary sealing disc 700. The rotary sealing disc 700 is fixed to the rotating shaft 400 and located between the first air seal assembly 200 and the bearing 600.

[0040] Specifically, the rotary sealing disc 700 is located within the bearing housing 610, with one end engaging with the end face of the bearing 600 and the other end spaced apart from the end face of the pneumatic sealing disc 210. The rotary sealing disc 700 and the rotating shaft 400 can be interference-fitted, or they can be fixed together by screws or a key connection. The outer diameter of the rotary sealing disc 700 near the pneumatic sealing disc 210 is larger than the outer diameter near the bearing 600. The specific variation in the outer diameter of the rotary sealing disc 700 can be designed according to the actual installation space; this invention does not impose limitations on this.

[0041] By setting a rotating sealing disk 700, when the rotating shaft 400 rotates, it will drive the rotating sealing disk 700 to rotate synchronously. The end of the rotating sealing disk 700 close to the pneumatic sealing disk 210 will push the air to flow towards the pneumatic sealing disk 210, thereby restricting the flow direction of the gas and further reducing the possibility of gas passing through the pneumatic sealing disk 210 and flowing to the bearing 600.

[0042] Reference Figure 2 As shown, in some embodiments of the present invention, the air compressor sealing structure further includes fan blades 710. Fan blades 710 are disposed on the side of the rotating sealing disk 700 near the first air seal assembly 200, and are distributed in multiple circumferentially around the rotating sealing disk 700.

[0043] Specifically, the fan blade 710 can be arranged in a strip shape on the end face of the rotary sealing disk 700. It can be fixedly connected to the rotary sealing disk 700 or rotatably connected to the rotary sealing disk 700. By setting the fan blade 710, the rotary sealing disk 700 can form a large airflow when rotating, so as to further improve the air sealing effect.

[0044] Reference Figure 1 As shown, in some embodiments of the present invention, the first gas seal assembly 200 includes a sealing carbon ring 310. The sealing carbon ring 310 is sleeved on the rotating shaft 400, and a gas pressure sealing gap 320 is formed between the inner sidewall of the sealing carbon ring 310 and the outer sidewall of the rotating shaft 400. A vent hole 311 communicating with the gas pressure sealing gap 320 is provided in the sealing carbon ring 310, and the vent hole 311 is used to communicate with a gas injection device.

[0045] Specifically, a notch can be provided on the end face of the second end 120 of the connecting sleeve 100 for the installation of the sealing carbon ring 310. The sealing carbon ring 310 has a convex cross-section, with the central part through which the rotating shaft 400 passes. The sealing carbon ring 310 is rotatably connected to the rotating shaft 400. The side of the sealing carbon ring 310 is fixedly connected to the connecting sleeve 100 by a through bolt, and a vent hole 311 is provided through the side of the sealing carbon ring 310. The extension direction of the vent hole 311 is perpendicular to the axial direction of the rotating shaft 400.

[0046] The connecting sleeve 100 has an injection port 150 that communicates with the air guide hole 311. The injection port 150 is connected to an injection device via a pipeline. The injection device can be a high-pressure air pump, which can inject water vapor into the air guide hole 311. The inner diameter of the sealing carbon ring 310 is larger than the outer diameter of the rotating shaft 400, so that a pressure sealing gap 320 communicating with the air guide hole 311 is formed between the sealing carbon ring 310 and the rotating shaft 400.

[0047] By setting a sealing carbon ring 310 at the second end 120 of the connecting sleeve 100 and forming a pneumatic sealing gap 320, water vapor is injected into the guide air hole 311 through the air injection hole 150 during the rotation of the rotating shaft 400 using an air injection device. The water vapor flows into the pneumatic sealing gap 320 along the guide air hole 311. When the pneumatic sealing gap 320 is filled with water vapor, it can effectively seal the gap between the second end 120 of the connecting sleeve 100 and the rotating shaft 400, reducing the possibility of water vapor from the turbine entering the connecting sleeve 100.

[0048] Reference Figure 1 As shown, in some embodiments of the present invention, an exhaust chamber 140 is provided between the connecting sleeve 100 and the rotating shaft 400, which is connected to the air pressure sealing gap 320 and the exhaust hole 130 respectively. The exhaust chamber 140 is located between the first air seal assembly 200 and the second air seal assembly 300.

[0049] Specifically, the inner diameter of the first end 110 of the connecting sleeve 100 is larger than the inner diameter of the second end 120 of the connecting sleeve 100, so that the inner sidewall of the connecting sleeve 100 forms a stepped structure. The aforementioned exhaust chamber 140 is formed at the middle position of the connecting sleeve 100 along its axial direction, and the exhaust hole 130 penetrates the sidewall of the connecting sleeve 100 and communicates with the exhaust chamber 140. The exhaust hole 130 is located between the air injection hole 150 and the air injection pipe 220.

[0050] By forming an exhaust chamber 140 and an exhaust hole 130 between the sealing carbon ring 310 and the pneumatic sealing disc 210, when water vapor in the pneumatic sealing gap 320 flows into the exhaust chamber 140, the water vapor can only be discharged to the outside of the connecting sleeve 100 through the exhaust hole 130 due to the air pressure blocking of the pneumatic sealing disc 210, thereby reducing the possibility of water vapor contacting the bearing 600.

[0051] Reference Figure 1 As shown, the air compressor includes: a housing 500, a rotating shaft 400, and an air compressor sealing structure as described above. The rotating shaft 400 is rotatably connected to the housing 500, and the air compressor sealing structure is disposed on the rotating shaft 400 and connected to the housing 500.

[0052] The air compressor adopts the above-mentioned air compressor sealing structure. The water vapor outside the connecting sleeve 100 is blocked by the water vapor of the second air seal assembly 300, while the first air seal assembly 200 can block the water vapor used by the second air seal assembly 300. This allows the water vapor to be discharged only through the exhaust port 130, effectively reducing the possibility of water vapor coming into contact with the bearing 600 and reducing the possibility of the bearing 600 corroding and causing air compressor failure. This enables the air compressor to operate reliably for a long time.

[0053] Reference Figure 1 As shown, in some embodiments of the present invention, the air compressor further includes an impeller 800 and a back plate 810. The impeller 800 is disposed on the rotating shaft 400. The back plate 810 is disposed on the impeller 800 and connected to the connecting sleeve 100 of the air compressor sealing structure.

[0054] Specifically, the back plate 810 is bolted to the end face of the second end 120 of the connecting sleeve 100, and its side away from the connecting sleeve 100 forms a sealed connection with the side of the impeller 800. The impeller 800 is sleeved on the rotating shaft 400 and fixedly connected to the rotating shaft 400. As water vapor is gradually introduced into the impeller 800, the pressure of the water vapor is changed when the rotating shaft 400 drives the impeller 800 to rotate. The water vapor seal between the second end 120 of the connecting sleeve 100 and the rotating shaft 400 prevents water vapor in the impeller 800 from flowing into the connecting sleeve 100, thus ensuring that the water vapor pressure in the impeller 800 is not lost, thereby ensuring the long-term reliable operation of the air compressor.

[0055] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A sealing structure for an air compressor, characterized in that, The air compressor sealing structure includes: A connecting sleeve (100) is fitted onto the rotating shaft (400) of the air compressor. The connecting sleeve (100) has a first end (110) and a second end (120) opposite to each other. A first gas seal assembly (200) is disposed at the first end (110) of the connecting sleeve (100). The first gas seal assembly (200) is sleeved on the rotating shaft (400) and connected to the bearing (600) of the rotating shaft (400) to seal the gap between the first end (110) of the connecting sleeve (100) and the rotating shaft (400) by sealing gas. The second air seal assembly (300) is disposed between the connecting sleeve (100) and the rotating shaft (400) and located at the second end (120) of the connecting sleeve (100) to seal the gap between the second end (120) of the connecting sleeve (100) and the rotating shaft (400) by water vapor; The connecting sleeve (100) has an exhaust hole (130) located between the first air seal assembly (200) and the second air seal assembly (300); The first air seal assembly (200) includes: A pneumatic sealing disc (210) is sleeved on the rotating shaft (400), and a pneumatic chamber (240) is provided inside the pneumatic sealing disc (210); An air injection tube (220) has one end connected to the air pressure chamber (240) and the other end extending out of the connecting sleeve (100) for connection to an air injection device; and Multiple comb teeth (230) are disposed on the side of the pneumatic sealing disc (210) near the rotating shaft (400), and an air sealing groove (250) communicating with the pneumatic chamber (240) is formed between two adjacent comb teeth (230).

2. The air compressor sealing structure according to claim 1, characterized in that, The bearing (600) is provided with a bearing seat (610) on the outside, and the pneumatic sealing disc (210) is fixed on the bearing seat (610).

3. The air compressor sealing structure according to claim 2, characterized in that, The air compressor sealing structure also includes: A rotating sealing disc (700) is fixed on the rotating shaft (400) and located between the first air seal assembly (200) and the bearing (600).

4. The air compressor sealing structure according to claim 3, characterized in that, The air compressor sealing structure also includes: The fan blade (710) is disposed on the side of the rotary sealing disk (700) near the first air seal assembly (200).

5. The air compressor sealing structure according to claim 4, characterized in that, The fan blades (710) are distributed in multiple circumferentially around the rotating sealing disk (700).

6. The air compressor sealing structure according to any one of claims 1 to 5, characterized in that, The first air seal assembly (200) includes: A sealing carbon ring (310) is sleeved on the rotating shaft (400). A pneumatic sealing gap (320) is formed between the inner sidewall of the sealing carbon ring (310) and the outer sidewall of the rotating shaft (400). An air guide hole (311) communicating with the pneumatic sealing gap (320) is provided in the sealing carbon ring (310). The air guide hole (311) is used to communicate with an air injection device.

7. The air compressor sealing structure according to claim 6, characterized in that, An exhaust chamber (140) is provided between the connecting sleeve (100) and the rotating shaft (400), which is connected to the air pressure sealing gap (320) and the exhaust hole (130) respectively. The exhaust chamber (140) is located between the first air seal assembly (200) and the second air seal assembly (300).

8. An air compressor, characterized in that, The air compressor includes: Casing (500); A rotating shaft (400) is rotatably connected to the housing (500); and The air compressor sealing structure as described in any one of claims 1 to 7 is disposed on the rotating shaft (400) and connected to the housing (500).

9. The air compressor according to claim 8, characterized in that, The air compressor also includes: An impeller (800) is disposed on the rotating shaft (400); and A back plate (810) is disposed on the impeller (800) and connected to the connecting sleeve (100) of the air compressor sealing structure.

Images