A dynamic seal structure of liquid-containing and dust-containing mixed gas applied to a roots blower

Abstract

The application provides a dynamic sealing structure of liquid-containing and dust-containing mixed gas applied to a Roots blower, and relates to the field of sealing structures of Roots blowers. The dynamic sealing structure of liquid-containing and dust-containing mixed gas applied to the Roots blower comprises a casing and a shaft, further comprises a comb-tooth sealing assembly, a single-end mechanical sealing assembly and an oil throwing assembly, the comb-tooth sealing assembly, the single-end mechanical sealing assembly and the oil throwing assembly are all arranged between the shaft and the casing, the comb-tooth sealing assembly is arranged on the side close to the casing corresponding to the conveying medium, the single-end mechanical sealing assembly is arranged on the side away from the conveying medium of the comb-tooth sealing assembly, the oil throwing assembly is arranged between the two, an oil throwing area is arranged in the sealing, and the oil throwing area corresponds to the oil throwing assembly and the comb-tooth sealing assembly. The dynamic sealing structure of liquid-containing and dust-containing mixed gas applied to the Roots blower realizes the sealing effect of high efficiency and durability by arranging the comb-tooth sealing assembly and other components, and avoids the problem that the medium and the sealing surface are polluted.

Description

Technical Field

[0001] This invention relates to the field of sealing structures for Roots blowers, specifically a dynamic sealing structure for liquid- and dust-containing mixed gases applied to Roots blowers. Background Technology

[0002] Roots blowers are generally used for conveying air and have relatively low sealing requirements. Gas is primarily sealed at the end caps through a skeleton structure or labyrinth structure. The end caps typically have holes connecting to the atmosphere, allowing some air to escape. However, the seals and rubber of the skeleton structure are prone to wear and aging over time. When conveying other industrial gases, the compatibility between the gas and the rubber must be considered.

[0003] Existing shaft end sealing technologies for Roots blowers generally include labyrinth seals, expansion ring seals, skeleton oil seals, packing, PTFE molded packing, and mechanical seals. Depending on the operating conditions, a specific type of seal is typically selected for the Roots blower. When conveying special industrial gases, improper selection of the sealing structure will result in insufficient sealing performance or inadequate service life.

[0004] Currently, mechanical seals on the market mainly isolate lubricating oil and gas by directly adding a mechanical seal to the end cover near the bearing position. However, because liquid and dust-containing gases directly impact the sealing surface of the mechanical seal, long-term operation will lead to premature failure of the sealing surface, which in turn will cause dangerous gas leakage.

[0005] For industrial gases containing a large amount of liquid and dust, if only mechanical seals are used, pressurized gases containing liquid and dust will easily cause problems such as rapid failure of mechanical seals and serious oil contamination, which will greatly increase maintenance costs. Summary of the Invention

[0006] To address the shortcomings of existing sealing technologies for conveying industrial gases, this invention provides a dynamic sealing structure for liquid- and dust-containing mixed gases applied to Roots blowers, thus solving the problems mentioned in the background section.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a dynamic sealing structure for a liquid-dust-containing mixed gas applied to a Roots blower, comprising a housing and a shaft, and further comprising a comb-tooth seal assembly, a single-end mechanical seal assembly, and an oil-throwing assembly. The comb-tooth seal assembly, the single-end mechanical seal assembly, and the oil-throwing assembly are all disposed between the shaft and the housing. The comb-tooth seal assembly is located on the side of the housing closest to the conveying medium, the single-end mechanical seal assembly is located on the side of the comb-tooth seal assembly furthest from the conveying medium, and the oil-throwing assembly is located between the two. An oil-throwing area is provided inside the housing, corresponding to the oil-throwing assembly and the comb-tooth seal assembly. A drain port is provided at the bottom of the housing, corresponding to the oil-throwing area.

[0008] The comb-tooth sealing assembly includes inner comb teeth, outer comb teeth, an oil baffle ring, and a rotor seal. The inner comb teeth are fixedly sleeved on the shaft, and a rubber ring seal is used between them. The outer comb teeth are fixed on the housing, and a rubber ring seal is used between them. The rotor seal is located between the inner and outer comb teeth and is fixed on the shaft, and a rubber ring seal is used between it and the shaft. The outer comb teeth are sleeved outside the rotor seal, and the two rotate together. The oil baffle ring is fixed on the outer comb teeth, and its inner ring is clamped outside the rotor seal and rotates with it. The inner comb teeth are located in the oil-slinging area.

[0009] Preferably, both the inner and outer comb teeth are provided with tooth-shaped comb surfaces, with the comb surface of the inner comb teeth located on the outer ring and the comb surface of the outer comb teeth located on the inner ring. The comb surface of the outer comb teeth rotates in cooperation with the rotor seal, and the comb surface of the inner comb teeth rotates in cooperation with the housing.

[0010] Preferably, the housing also includes a rinsing area, and a rinsing pipe connected to the rinsing area is installed at the lower part of the housing. The rotor seal, outer comb teeth, and oil baffle ring are all located in the rinsing area.

[0011] Preferably, the shaft is mounted on the housing using a bearing and is rotatably connected to the housing. The bearing is located on the outer wall of the housing, and an oil inlet is provided on the outer wall of the housing corresponding to the bearing. The oil inlet is located on the side of the bearing outside the housing, while the side of the bearing inside the housing is in the rinsing area.

[0012] Preferably, the oil-slinging assembly includes an oil-slinging ring, which is fixedly sleeved on the outside of the shaft and sealed with the shaft by a rubber ring. The outer ring of the oil-slinging ring is bent away from the inner comb teeth, and the oil-slinging ring is located in the oil-slinging area.

[0013] Preferably, the single-end mechanical seal assembly includes a fixed ring seat, a fixed ring, a rotating ring, and a compensating spring. The fixed ring seat is fixedly embedded in the housing, located between the rotor seal and the oil slinger ring, and is sealed with a rubber ring. One side of the fixed ring seat is located within the oil slinger area, and this side has a bending groove that mates with the bent end of the oil slinger ring. The bent end of the oil slinger ring is inserted into the bending groove, and the two rotate together. The rotating ring is fixedly installed on the side of the rotor seal near the fixed ring seat, and the two are sealed with two rubber rings. The fixed ring is snapped onto the side of the fixed ring seat corresponding to the rotating ring, and the two are slidably connected. The compensating spring is located between and connects the two, and the compensating spring causes the fixed ring and the rotating ring to contact and form a sealing surface. A high-pressure chamber is formed between the fixed ring seat and the sealing surface. The fixed ring seat has an oil injection hole that communicates with the high-pressure chamber.

[0014] Preferably, the outer ring of the fixed ring seat is provided with a stepped groove, the inner ring of the fixed ring is fitted with the stepped groove, and a rubber ring seven is provided between the two to seal the fixed ring and the fixed ring seat.

[0015] Preferably, a retaining ring is also fixedly fitted outside the fixed ring, and the outer ring of the retaining ring is engaged in the fixed ring seat.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] This dynamic sealing structure for liquid-dust-containing mixed gas in Roots blowers utilizes a comb-tooth sealing assembly for primary sealing. A single-end mechanical seal assembly is then used for secondary sealing when the volume and pressure of the medium after throttling and depressurization are low. Under high-pressure oil lubrication, the end-face seal firmly seals the small amount of low-pressure medium released from the primary seal, sealing the gap between the two stages. An oil-throwing assembly with a blocking and throwing structure serves multiple functions: blocking gas, blocking liquid, and throwing liquid. After the primary seal, it further prevents the downstream impact and flow of the liquid-dust-containing mixed gas. The oil-throwing ring also prevents lubricating oil from flowing to the medium side when the single-end mechanical seal fails (only when the mechanical seal is damaged), while simultaneously throwing the lubricating oil towards the drain port, thus protecting the medium from contamination.

[0018] This dynamic sealing structure for liquid-dust-containing gas mixtures applied to Roots blowers utilizes an oil-throwing area and a drain port, along with a condensate trap to achieve periodic automatic drainage. This multi-layered sealing structure significantly improves the reliability of the dynamic seal for liquid-dust-containing gas mixtures. It not only prevents leakage of the mixture to mechanical transmission components (such as bearings and gears), ensuring the lubrication of these components remains uncontaminated, but also systematically guides and drains condensate, preventing media leakage to the atmosphere or oil-gas cross-contamination in case of seal failure. Furthermore, a flushing area is provided directly opposite the comb-tooth seal, allowing for thorough cleaning of rust and other contaminants during maintenance and repair.

[0019] This dynamic sealing structure, applied to Roots blowers for liquid-dust mixed gases, utilizes a high-pressure chamber. The mechanical seal is flushed with high-pressure lubricating oil, sealing the medium on one side of the single-end friction pair, while lubricating oil flows to the bearing through the flushing area on the other side. Due to the assembly sequence and space constraints of Roots blowers, lubricating oil is often injected only at the outer end (bearing cavity inlet side), or by using oil pipe spraying or oil slinger. When the bearing is large, the lubricating oil is difficult to distribute evenly in the thickness direction; uneven oil film distribution or localized dry friction significantly reduces the bearing's high-load service life. This design adds internal auxiliary lubrication to the bearing, achieving double-sided oil injection lubrication. Furthermore, the lubrication channels are unobstructed, with sufficient oil quantity and high flow rate, greatly improving the bearing's lubrication conditions and effectively enhancing bearing reliability, extending its service life, and extending the overall service life of the machine.

[0020] This dynamic sealing structure for liquid-dust mixed gas applied to Roots blowers, using a single-end mechanical seal, offers advantages over double-end mechanical seals. While ensuring lubrication and sealing of the mechanical seal surface and improving bearing lubrication conditions, it also shortens the axial dimension, making it more compact and improving the stress state of the Roots blower rotor. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the present invention;

[0022] Figure 2 This is a cross-sectional view of the structure of the present invention;

[0023] Figure 3 This is a structural diagram of the housing and shaft of the present invention;

[0024] Figure 4 This is a front view of the housing and shaft of the present invention;

[0025] Figure 5 This is a cross-sectional view of the housing and shaft of the present invention;

[0026] Figure 6 This is a schematic diagram of the structure on the shaft of the present invention;

[0027] Figure 7 For the present invention Figure 2 Enlarged view of the structure at point A in the middle;

[0028] Figure 8 For the present invention Figure 2 Enlarged view of the structure at point B.

[0029] In the diagram: 1. Housing; 2. Shaft; 3. Comb tooth sealing assembly; 301. Inner comb tooth; 302. Outer comb tooth; 303. Oil retaining ring; 304. Rotor seal; 305. Rubber ring one; 306. Rubber ring two; 307. Rubber ring three; 4. Single-end mechanical seal assembly; 401. Fixed ring seat; 402. Fixed ring; 403. Moving ring; 404. Compensating spring; 405. Rubber ring five; 406. Bending groove; 407. Rubber ring six; 408. High-pressure chamber; 409. Oil injection hole; 410. Rubber ring seven; 411. Snap ring; 5. Oil slinger assembly; 501. Oil slinger ring; 502. Rubber ring four; 6. Oil slinger area; 7. Drain outlet; 8. Flushing area; 9. Flushing pipe; 10. Bearing; 11. Oil injection port. Detailed Implementation

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

[0031] It should be noted that all directional indications in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0032] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0033] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. If the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

[0034] like Figures 1-8 As shown, a dynamic sealing structure for liquid-dust mixed gas applied to a Roots blower includes a housing 1 and a shaft 2, and also includes a comb-tooth seal assembly 3, a single-end mechanical seal assembly 4, and an oil slinger assembly 5. The comb-tooth seal assembly 3, the single-end mechanical seal assembly 4, and the oil slinger assembly 5 are all located between the shaft 2 and the housing 1. The comb-tooth seal assembly 3 is located on the side of the housing 1 that corresponds to the conveying medium, the single-end mechanical seal assembly 4 is located on the side of the comb-tooth seal assembly 3 that is away from the conveying medium, and the oil slinger assembly 5 is located between the two. An oil slinger area 6 is provided inside the housing 1, and the oil slinger area 6 corresponds to the oil slinger assembly 5 and the comb-tooth seal assembly 3. A drain port 7 is provided at the bottom of the housing 1, and the drain port 7 corresponds to the oil slinger area 6.

[0035] like Figures 7-8As shown, the comb seal assembly 3 includes an inner comb tooth 301, an outer comb tooth 302, an oil baffle ring 303, and a rotor seal 304. The inner comb tooth 301 is fixedly sleeved on the shaft 2, and the two are sealed by a rubber ring 305. The outer comb tooth 302 is fixed on the housing 1, and the two are sealed by a rubber ring 306. The rotor seal 304 is located between the inner comb tooth 301 and the outer comb tooth 302 and is fixed on the shaft 2. It is sealed with a rubber ring 307. The outer comb tooth 302 is sleeved outside the rotor seal 304, and the two rotate together. The oil baffle ring 303 is fixed on the outer comb tooth 302, and its inner ring is stuck outside the rotor seal 304 and rotates with it. The inner comb tooth 301 is located in the oil slinging area 6.

[0036] Seven drain outlets are equipped with valves for regular cleaning. Three comb-tooth sealing components provide primary sealing. The comb-tooth seals can also be filled with air or liquid to isolate / clean contaminants. The amount of medium intercepted after the comb-tooth seal is small and the pressure is low.

[0037] Both the inner comb tooth 301 and the outer comb tooth 302 are provided with tooth-shaped comb tooth surfaces. The comb tooth surface of the inner comb tooth 301 is located on the outer ring, and the comb tooth surface of the outer comb tooth 302 is located on the inner ring. The comb tooth surface of the outer comb tooth 302 is rotatably engaged with the rotor seal 304, and the comb tooth surface of the inner comb tooth 301 is rotatably engaged with the housing 1.

[0038] The inner comb teeth 301 and the outer comb teeth 302 are fixed and rotating, respectively. Their comb tooth surfaces are opposite, which can achieve a double-interlaced isolation medium to prevent oil and gas from mixing.

[0039] The housing 1 is also provided with a flushing area 8. A flushing pipe 9 that communicates with the flushing area 8 is installed at the lower part of the housing 1. The rotor seal 304, the outer comb tooth 302 and the oil baffle ring 303 are all located in the flushing area 8.

[0040] During maintenance and repair, rust and other dirt can be thoroughly cleaned. Valves are installed on the air filling pipe and liquid filling pipe respectively, and can be switched as needed.

[0041] Shaft 2 is mounted on housing 1 with bearing 10 and is rotatably connected to housing 1. Bearing 10 is located on the outer wall of housing 1. An oil inlet 11 is provided on the outer wall of housing 1 corresponding to bearing 10. The oil inlet 11 is located on the side of bearing 10 outside housing 1. The side of bearing 10 inside housing 1 is located in rinsing area 8.

[0042] like Figures 1-2 As shown, the rotatable connection between one end of shaft 2 and housing 1 is made of two bearings 10. Due to the assembly sequence and space constraints of the Roots blower from the inside to the outside, the oil inlet 11 is located at the outer end for injecting lubricating oil.

[0043] like Figures 6-8As shown, the oil-slinging assembly 5 includes an oil-slinging ring 501, which is fixedly sleeved on the outside of the shaft 2 and sealed with the shaft 2 by a rubber ring 502. The outer ring of the oil-slinging ring 501 is bent away from the inner comb teeth 301, and the oil-slinging ring 501 is located in the oil-slinging area 6.

[0044] The oil slinger ring 501 employs a blocking and throwing structure, serving multiple functions: blocking medium gas, blocking medium liquid, and throwing medium liquid. After the primary seal of the comb-tooth sealing assembly 3, it further prevents the impact and flow of liquid- and dust-containing mixed gas downstream. The oil slinger ring 501 also prevents lubricating oil from flowing to the medium side when only the mechanical seal of the single-end mechanical seal assembly 4 fails, simultaneously throwing the lubricating oil into the oil-throwing area 6, thus protecting the medium from contamination. This sealing structure also includes a drain port 7 below the space corresponding to the oil slinger ring 501, with a condensate drain valve installed to achieve periodic automatic drainage.

[0045] The single-end mechanical seal assembly 4 includes a fixed ring seat 401, a fixed ring 402, a rotating ring 403, and a compensating spring 404. The fixed ring seat 401 is fixedly embedded in the housing 1, located between the rotor seal 304 and the oil slinger ring 501, and is sealed to the housing 1 by a rubber ring 405. One side of the fixed ring seat 401 is located within the oil slinger area 6, and this side is provided with a bending groove 406 that mates with the bent end of the oil slinger ring 501. The bent end of the oil slinger ring 501 is inserted into the bending groove 406, and the two rotate together. The rotating ring 403 is fixed. The rotor seal 304 is installed on the side near the fixed ring seat 401, and the two are sealed by two rubber rings 407. The fixed ring 402 is stuck on the side of the fixed ring seat 401 corresponding to the rotating ring 403, and the two are slidably connected. The compensating spring 404 is located between the two and connects them. The compensating spring 404 causes the fixed ring 402 to contact the rotating ring 403 to form a sealing surface. A high pressure chamber 408 is formed between the fixed ring seat 401 and the sealing surface. The fixed ring seat 401 is provided with an oil injection hole 409 that communicates with the high pressure chamber 408.

[0046] The oil slinger ring 501, in conjunction with the bending groove 406, further alters the flow direction of the low-pressure medium. At the same time, the structure of the oil slinger ring 501 can also throw out the oil sludge leaking from the friction surface. An oil film is formed between the sealing surfaces of the fixed ring 402 and the moving ring 403. The high-pressure chamber 408, located outside the contact surface, is sealed with high-pressure lubricating oil, which not only prevents the leakage of the internal medium but also enhances lubrication.

[0047] The outer ring of the fixed ring seat 401 is provided with a stepped groove, and the inner ring of the fixed ring 402 is matched with the stepped groove. A rubber ring 410 is provided between the two to seal the fixed ring 402 and the fixed ring seat 401.

[0048] The rubber ring 7410 further achieves sealing when the fixed ring 402 moves.

[0049] A retaining ring 411 is also fixedly fitted outside the fixed ring 402, and the outer ring of the retaining ring 411 is inserted into the fixed ring seat 401.

[0050] The retaining ring 411 is used to prevent high-pressure lubricating oil leakage.

[0051] In use, the comb-tooth sealing assembly 3 can achieve primary sealing. The single-end mechanical seal assembly 4 has a small amount of medium and low pressure after throttling and depressurization. At this time, the single-end mechanical seal assembly 4 is used to perform secondary sealing of the medium. Under the working conditions of high-pressure oil lubrication, the end face seal firmly seals the small amount of low-pressure medium throttled out by the primary seal. The gap between the two seals is sealed with an oil slinger assembly 5. The oil slinger ring 501 has multiple functions: blocking medium gas, blocking medium liquid, and slinging medium liquid. After the primary seal, it further blocks the impact and flow of liquid and dust mixed gas downstream. The oil slinger ring 501 can also block the flow of lubricating oil to the medium side when the single-end mechanical seal assembly 4 fails or only the mechanical seal is damaged. At the same time, it throws the lubricating oil to the drain port 7, which protects the medium from being contaminated. The oil slinger area 6 and the drain port 7 are equipped with a condensate drain valve to achieve periodic automatic drainage. This multi-layered sealing structure effectively improves the reliability of dynamic seals for liquid- and dust-containing gas mixtures. It not only prevents leakage of the liquid- and dust-containing gas mixture to mechanical transmission components such as bearings 10 and gears, ensuring the lubrication of these components remains uncontaminated, but also orderly guides and drains condensate, preventing media leakage to the atmosphere or oil-gas cross-contamination after seal failure. Furthermore, a flushing area 8 is provided directly opposite the comb-tooth seal, allowing for thorough cleaning of rust and other contaminants during maintenance. The mechanical seal is flushed with high-pressure lubricating oil, sealing the medium on one side of the single-end friction pair, while the lubricating oil on the other side flows through flushing area 8 to the bearing 10. Due to the assembly sequence and space constraints of Roots blowers, lubricating oil is often injected externally, or sprayed through oil pipes or slingered using an oil slinger. When the bearing 10 is large, the lubricating oil is difficult to distribute evenly in the thickness direction; uneven oil film distribution or localized dry friction will significantly reduce the high-load service life of the bearing 10. Internal auxiliary lubrication was added to the bearing 10, enabling double-sided oil injection lubrication. Moreover, the lubrication channels were smooth inside and out, with sufficient oil volume and high flow rate, greatly improving the lubrication conditions and status of the bearing 10.

[0052] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0053] Furthermore, the technical solutions of the various embodiments can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0054] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A dynamic sealing structure for a liquid-dust-containing mixed gas applied in a Roots blower, comprising a housing (1) and a shaft (2), characterized in that: It also includes a comb-tooth seal assembly (3), a single-end mechanical seal assembly (4), and an oil-throwing assembly (5). The comb-tooth seal assembly (3), the single-end mechanical seal assembly (4), and the oil-throwing assembly (5) are all located between the shaft (2) and the housing (1). The comb-tooth seal assembly (3) is located on the side of the housing (1) that corresponds to the conveying medium. The single-end mechanical seal assembly (4) is located on the side of the comb-tooth seal assembly (3) that is away from the conveying medium. The oil-throwing assembly (5) is located between the two. An oil-throwing area (6) is provided inside the housing (1). The oil-throwing area (6) corresponds to the oil-throwing assembly (5) and the comb-tooth seal assembly (3). A drain port (7) is provided at the bottom of the housing (1). The drain port (7) corresponds to the oil-throwing area (6). The comb sealing assembly (3) includes an inner comb tooth (301), an outer comb tooth (302), an oil baffle ring (303), and a rotor seal (304). The inner comb tooth (301) is fixedly sleeved on the shaft (2), and the two are sealed by a rubber ring one (305). The outer comb tooth (302) is fixed on the housing (1), and the two are sealed by a rubber ring two (306). The rotor seal (304) is located between the inner comb tooth (301) and the outer comb tooth (302) and is fixed on the shaft (2). It is sealed with a rubber ring three (307) between the inner comb tooth (301) and the outer comb tooth (302). The outer comb tooth (302) is sleeved outside the rotor seal (304), and the two rotate together. The oil baffle ring (303) is fixed on the outer comb tooth (302), and its inner ring is stuck outside the rotor seal (304) and rotates together with it. The inner comb tooth (301) is located in the oil slinging area (6).

2. The dynamic sealing structure for liquid- and dust-containing mixed gas applied to a Roots blower according to claim 1, characterized in that: Both the inner comb tooth (301) and the outer comb tooth (302) are provided with tooth-shaped comb tooth surfaces. The comb tooth surface of the inner comb tooth (301) is located on the outer ring, and the comb tooth surface of the outer comb tooth (302) is located on the inner ring. The comb tooth surface of the outer comb tooth (302) is rotatably engaged with the rotor seal (304), and the comb tooth surface of the inner comb tooth (301) is rotatably engaged with the housing (1).

3. The dynamic sealing structure for liquid- and dust-containing mixed gas applied to a Roots blower according to claim 1, characterized in that: The housing (1) is also provided with a flushing area (8). A flushing pipe (9) connected to the flushing area (8) is installed at the lower part of the housing (1). The rotor seal (304), the outer comb teeth (302) and the oil baffle ring (303) are all located in the flushing area (8).

4. The dynamic sealing structure for liquid- and dust-containing mixed gas applied to a Roots blower according to claim 3, characterized in that: The shaft (2) is mounted on the housing (1) with a bearing (10) and is rotatably connected to the housing (1). The bearing (10) is located on the outer wall of the housing (1). The outer wall of the housing (1) is provided with an oil inlet (11) corresponding to the bearing (10). The oil inlet (11) is located on the side of the bearing (10) outside the housing (1). The side of the bearing (10) inside the housing (1) is located in the flushing area (8).

5. The dynamic sealing structure for liquid- and dust-containing mixed gas applied to a Roots blower according to claim 4, characterized in that: The oil-slinging assembly (5) includes an oil-slinging ring (501), which is fixedly sleeved on the outside of the shaft (2) and sealed with the shaft (2) by a rubber ring (502). The outer ring of the oil-slinging ring (501) is bent away from the inner comb teeth (301), and the oil-slinging ring (501) is located in the oil-slinging area (6).

6. The dynamic sealing structure for liquid- and dust-containing mixed gas applied to a Roots blower according to claim 5, characterized in that: The single-end mechanical seal assembly (4) includes a fixed ring seat (401), a fixed ring (402), a rotating ring (403), and a compensating spring (404). The fixed ring seat (401) is fixedly embedded in the housing (1) and is located between the rotor seal (304) and the oil slinger ring (501). It is sealed with the housing (1) by a rubber ring (405). One side of the fixed ring seat (401) is located in the oil slinger area (6), and this side is provided with a bending groove (406) that cooperates with the bent end of the oil slinger ring (501). The bent end of the oil slinger ring (501) is inserted into the bending groove (406), and the two rotate together. The rotating ring (403) 3) The rotor seal (304) is fixedly installed on the side of the fixed ring seat (401) and sealed by two rubber rings (407). The fixed ring (402) is stuck on the side of the fixed ring seat (401) corresponding to the moving ring (403) and the two are slidably connected. The compensating spring (404) is located between the two and connects them. The compensating spring (404) causes the fixed ring (402) to contact the moving ring (403) to form a sealing surface. A high pressure chamber (408) is formed between the fixed ring seat (401) and the sealing surface. The fixed ring seat (401) is provided with an oil injection hole (409) that communicates with the high pressure chamber (408).

7. The dynamic sealing structure for liquid- and dust-containing mixed gas applied to a Roots blower according to claim 6, characterized in that: The outer ring of the fixed ring seat (401) is provided with a stepped groove, and the inner ring of the fixed ring (402) is matched with the stepped groove. A rubber ring seven (410) is provided between the two, and the rubber ring seven (410) seals the fixed ring (402) and the fixed ring seat (401).

8. The dynamic sealing structure for liquid- and dust-containing mixed gas applied to a Roots blower according to claim 7, characterized in that: A retaining ring (411) is also fixedly fitted outside the fixed ring (402), and the outer ring of the retaining ring (411) is inserted into the fixed ring seat (401).

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