Roots blower with carbon ring sealing structure

Abstract

The utility model provides a Roots blower with a carbon ring sealing structure, which is provided with an impeller shaft, the outer circumference of the impeller shaft is fixedly provided with a first shaft sleeve, the outer circumference of the first shaft sleeve is provided with a carbon ring sealing seat, and the inner circumference of the carbon ring sealing seat is provided with a graphite sealing ring accommodating groove. A spring containing groove is formed in the axial inner side groove face of the graphite sealing ring containing groove, a graphite sealing ring is arranged in the graphite sealing ring containing groove, the inner circumference of the graphite sealing ring is tightly attached to the outer circumference of the first shaft sleeve, a spring containing groove is formed in the axial inner side end of the graphite sealing ring, and a spring is arranged between the two spring containing grooves. The Roots blower solves the technical problems that according to an existing Roots blower, a mechanical sealing seat is additionally arranged at the rotary connecting position of an impeller shaft and an oil tank, gas is isolated and sealed, but when granular foreign matter is doped in the gas, the foreign matter enters the mechanical sealing seat, the mechanical sealing seat is abraded, and the sealing effect of the mechanical sealing seat is reduced. The Roots blower can be widely applied to Roots blowers.

Description

Technical Field

[0001] The utility model relates to a Roots blower, in particular to a Roots blower with a carbon ring sealing structure. Background Art

[0002] Roots blower is a positive displacement gas blower, which is widely used in ventilation and process gas transportation in the fields of environmental protection, sewage treatment, coal power, chemical industry, etc.

[0003] Among them, the transportation requirements for some harmful gases, such as hydrogen, biogas, oil and gas, are relatively strict, and the sealing requirements of Roots blowers have higher standards, especially the rotating connection between the impeller shaft and the oil tank of the Roots blower. When the impeller shaft rotates at high speed for a long time, the rotating connection between the impeller shaft and the oil tank is prone to varying degrees of wear. Long-term wear will cause gaps in the rotating connection between the impeller shaft and the oil tank, causing harmful gases inside the blower to leak out through the gaps.

[0004] In order to solve the above problems, a mechanical seal seat is usually installed at the rotating connection between the impeller shaft and the oil tank to isolate and seal the harmful gas leaking out through the gap between the rotating connection between the impeller shaft and the oil tank. However, the mechanical seal seat is usually used for high-purity gas transmission. When the transmitted gas is mixed with foreign matter such as particles and coal tar, the foreign matter enters the mechanical seal seat, causing varying degrees of wear on the mechanical seal seat, thereby reducing the sealing effect of the mechanical seal seat. Utility Model Content

[0005] In view of the above technical problems, the utility model provides a Roots blower with a carbon ring sealing structure. The Roots blower with the carbon ring sealing structure is provided at the rotational connection between the impeller shaft and the oil tank. The carbon ring sealing structure is arranged at the rotational connection between the impeller shaft and the oil tank. The harmful gas can be sealed and foreign matter in the gas can be effectively blocked. Moreover, since the hardness of the graphite sealing ring in the carbon ring sealing structure is relatively high, the foreign matter in the gas can be prevented from damaging the graphite sealing ring, thereby realizing the continuous and stable sealing and isolation of the transmitted gas and the foreign matter in the gas by the carbon ring sealing structure.

[0006] To this end, the technical solution of the utility model is a Roots blower with a carbon ring sealing structure, provided with an impeller shaft, the outer circumference of the impeller shaft is fixed with a bearing, a third sleeve, a first sleeve, and a second sleeve in sequence from the outside to the inside, and the inner ring of the bearing, the third sleeve, the first sleeve, and the second sleeve are axially locked in sequence on the outer circumference of the impeller shaft;

[0007] A carbon ring sealing seat is provided on the outer circumference of the first shaft sleeve, a graphite sealing ring receiving groove is provided on the inner circumference of the carbon ring sealing seat, and a spring receiving groove is provided on the axial inner groove surface of the graphite sealing ring receiving groove;

[0008] A graphite sealing ring is arranged inside the graphite sealing ring receiving groove, the inner circumference of the graphite sealing ring is tightly fitted with the outer circumference of the first sleeve, and a spring receiving groove is arranged at the axial inner end of the graphite sealing ring;

[0009] The spring receiving groove on the graphite sealing ring and the spring receiving groove inside the graphite sealing ring receiving groove are axially symmetrically arranged, a spring is arranged between the two spring receiving grooves, one end of the spring is fixedly connected to the spring receiving groove inside the graphite sealing ring receiving groove, and the other end of the spring is elastically connected to the spring receiving groove on the graphite sealing ring, so as to form an axial elastic force support for the graphite sealing ring, and axially lock the axial outer end of the graphite sealing ring and the axial outer groove surface of the graphite sealing ring receiving groove;

[0010] A sealing gland is fixedly provided at the axial outer end of the carbon ring sealing seat, a groove is provided at the middle position of the axial inner end surface of the sealing gland, a graphite sealing ring receiving groove is formed between the groove and the adjacent position of the axial outer end of the carbon ring sealing seat, a graphite sealing ring is provided inside the graphite sealing ring receiving groove, the inner circumference of the graphite sealing ring is tightly fitted with the outer circumference of the first shaft sleeve, and a spring receiving groove is provided at the axial inner end of the graphite sealing ring;

[0011] A spring receiving groove is provided at the axially outer end of the carbon ring sealing seat at a position axially corresponding to the spring receiving groove at the axially inner end of the graphite sealing ring. The spring is located between the two spring receiving grooves. One end of the spring is fixedly connected to the spring receiving groove at the axially outer end of the carbon ring sealing seat. The other end of the spring is elastically connected to the spring receiving groove on the graphite sealing ring, forming an axial elastic force support for the graphite sealing ring, and axially locking the axially outer end of the graphite sealing ring and the axially outer groove surface of the graphite sealing ring receiving groove.

[0012] The first shaft sleeve, the sealing gland, the carbon ring sealing seat, the graphite sealing ring and the spring together form a carbon ring sealing structure;

[0013] An auxiliary wall plate is fixedly arranged on the outer circumference of the carbon ring sealing seat, a main wall plate is arranged on the axial outer side of the auxiliary wall plate, and the auxiliary wall plate and the main wall plate are fixedly connected at the axial inner side;

[0014] The outer circumference of the second shaft sleeve is provided with a side plate, and a gap is provided between the outer circumference of the second shaft sleeve and the side plate;

[0015] The side plate is a stepped shaft structure, the outer circumference of the inner shaft section of the side plate is fixedly connected to the inner circumference of the axial inner position of the auxiliary wall plate, and the axial outer end of the outer shaft section of the side plate is fixedly connected to the axial inner end of the auxiliary wall plate;

[0016] A bearing seat is provided on the outer circumference of the bearing outer ring of the bearing, the outer circumference of the bearing outer ring of the bearing is fixedly connected to the outer side of the inner circumference of the bearing seat, the inner side of the inner circumference of the bearing seat is located at a radially symmetrical position of the third sleeve, and a bearing isolator is provided between the inner side of the inner circumference of the bearing seat and the third sleeve;

[0017] The outer circumference of the bearing seat is fixedly connected to the inner circumference of the axial outer end of the main wall plate.

[0018] Preferably, there are a plurality of graphite sealing ring accommodating grooves on the carbon ring sealing seat, and the plurality of graphite sealing ring accommodating grooves are axially arranged on the inner circumference of the carbon ring sealing seat.

[0019] Preferably, the number of the graphite sealing ring accommodating grooves on the carbon ring sealing seat is three.

[0020] Preferably, a sealing ring receiving groove is provided on the outer circumference of the bearing seat, a first sealing ring is provided in the sealing ring receiving groove, and the outer circumference of the bearing seat and the inner circumference of the axial outer end of the main wall plate are sealed and fixed by the first sealing ring;

[0021] The outer circumference of the carbon ring sealing seat is provided with a sealing ring receiving groove, a second sealing ring is provided in the sealing ring receiving groove, and the outer circumference of the carbon ring sealing seat and the inner circumference of the auxiliary wall plate are sealed and fixed by the second sealing ring;

[0022] The inner circumference of the first shaft sleeve is provided with a sealing ring receiving groove, a third sealing ring is provided in the sealing ring receiving groove, and the inner circumference of the first shaft sleeve and the outer circumference of the impeller shaft are sealed and fixed by the third sealing ring;

[0023] The axial outer end face of the outer shaft section of the side plate is provided with a sealing ring receiving groove, in which a fourth sealing ring is provided, and the axial outer end face of the outer shaft section of the side plate and the axial inner end of the auxiliary wall plate are sealed and fixed by the fourth sealing ring.

[0024] Preferably, the main wall panel and the auxiliary wall panel are locked and fixed by locking screws;

[0025] The sealing gland and the carbon ring sealing seat are locked and fixed by locking screws;

[0026] The side panels and the auxiliary wall panels are locked and fixed by locking screws.

[0027] Preferably, the size of the gap between the outer circumference of the second sleeve and the inner circumference of the side plate is 0.2 mm±0.02 mm.

[0028] Preferably, the outer circumference of the second sleeve is provided with a plurality of grooves, and the plurality of grooves are axially arranged on the outer circumference of the second sleeve, and the plurality of grooves form a comb-tooth structure.

[0029] The beneficial effects of the utility model are:

[0030] 1. By setting the outer circumference of the second sleeve to a comb-tooth structure, which is equivalent to a labyrinth sealing structure, when the gas flows to the second sleeve, the gas enters the comb-tooth structure through the gap between the outer circumference of the second sleeve and the inner circumference of the side plate. The comb-tooth structure has an effective sealing effect on the incoming gas. At the same time, since the size of the gap between the outer circumference of the second sleeve and the inner circumference of the side plate is set in the range of 0.2mm±0.02mm, it can effectively isolate foreign matter in the gas and prevent foreign matter in the gas from entering the interior and causing damage to related internal components.

[0031] 2. A carbon ring sealing structure formed by the first sleeve, the sealing gland, the carbon ring sealing seat, the graphite sealing ring and the spring is also equivalent to a labyrinth sealing structure. When the impeller shaft rotates, an air film is formed between the graphite sealing ring and the first sleeve. The air film acts as an isolation seal for the gas medium flowing through it through the effect of throttling and reducing pressure, thereby preventing the gas from leaking outward through the position between the graphite sealing ring and the impeller shaft;

[0032] In addition, when some tiny foreign matter in the gas enters the carbon ring sealing structure through the gap between the second sleeve and the side plate, the tiny foreign matter in the gas will not damage the graphite sealing ring due to the high hardness of the graphite sealing ring, thereby ensuring that the graphite sealing ring continues to have efficient sealing performance, and the graphite sealing ring can isolate the foreign matter. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the structure of the utility model;

[0034] Figure 2 This utility model Figure 1 Enlarged view of point A in the middle;

[0035] Figure 3 This utility model Figure 1 Enlarged view of point B in the middle.

[0036] Explanation of symbols in the figure:

[0037] 1. Impeller shaft; 2. Bearing; 3. Bearing seat; 4. First sealing ring; 5. Main wall panel; 6. Sealing gland; 7. Auxiliary wall panel; 8. Carbon ring sealing seat; 9. Second sealing ring; 10. Graphite sealing ring; 11. Spring; 12. First sleeve; 13. Third sealing ring; 14. Second sleeve; 15. Side plate; 16. Fourth sealing ring; 17. Bearing isolator; 18. Third sleeve; 19. Locking screw; 20. Groove; 21. Graphite sealing ring receiving groove; 22. Shoulder; 23. Spring receiving groove. DETAILED DESCRIPTION

[0038] The utility model is further described below in conjunction with embodiments.

[0039] pass Figure 1-Figure 3 It can be seen that the Roots blower with a carbon ring sealing structure is provided with an impeller shaft 1, and the outer circumference of the impeller shaft 1 is fixedly provided with a bearing 2, a third sleeve 18, a first sleeve 12, and a second sleeve 14 in sequence from the outside to the inside, and the inner ring of the bearing 2, the third sleeve 18, the first sleeve 12, and the second sleeve 14 are fixedly connected to the impeller shaft 1 respectively.

[0040] The inner ring of the bearing 2 , the third sleeve 18 , the first sleeve 12 , and the second sleeve 14 are axially locked in sequence on the outer circumference of the impeller shaft 1 .

[0041] A carbon ring sealing seat 8 is disposed on the outer circumference of the first sleeve 12 , a graphite sealing ring accommodating groove 21 is disposed on the inner circumference of the carbon ring sealing seat 8 , and a spring accommodating groove 23 is disposed on the axial inner groove surface of the graphite sealing ring accommodating groove 21 .

[0042] A graphite sealing ring 10 is arranged inside the graphite sealing ring receiving groove 21 . The inner circumference of the graphite sealing ring 10 is tightly fitted with the outer circumference of the first sleeve 12 . A spring receiving groove 23 is arranged at the axial inner end of the graphite sealing ring 10 .

[0043] The spring receiving groove 23 on the graphite sealing ring 10 and the spring receiving groove 23 inside the graphite sealing ring receiving groove 21 are axially symmetrically arranged, and a spring 11 is arranged between the two spring receiving grooves 23. One end of the spring 11 is fixedly connected to the spring receiving groove 23 inside the graphite sealing ring receiving groove 21, and the other end of the spring 11 is elastically connected to the spring receiving groove 23 on the graphite sealing ring 10, so as to form an axial elastic support for the graphite sealing ring 10, and axially lock the axial outer end of the graphite sealing ring 10 and the axial outer groove surface of the graphite sealing ring receiving groove 21, so as to prevent the gas entering the graphite sealing ring receiving groove 21 from leaking outward through the gap between the axial outer end of the graphite sealing ring 10 and the axial outer groove surface of the graphite sealing ring receiving groove 21.

[0044] A sealing gland 6 is fixedly provided at the axial outer end of the carbon ring sealing seat 8, a groove is provided at the middle position of the axial inner end surface of the sealing gland 6, a graphite sealing ring accommodating groove 21 is formed between the groove and the adjacent position of the axial outer end of the carbon ring sealing seat 8, a graphite sealing ring 10 is provided inside the graphite sealing ring accommodating groove 21, the inner circumference of the graphite sealing ring 10 is tightly fitted with the outer circumference of the first sleeve 12, and a spring accommodating groove 23 is provided at the axial inner end of the graphite sealing ring 10.

[0045] A spring accommodating groove 23 is provided at a position at the axially outer end of the carbon ring sealing seat 8 that axially corresponds to the spring accommodating groove 23 at the axially inner end of the graphite sealing ring 10. The spring 11 is located between the two spring accommodating grooves 23. One end of the spring 11 is fixedly connected to the spring accommodating groove 23 at the axially outer end of the carbon ring sealing seat 8. The other end of the spring 11 is elastically connected to the spring accommodating groove 23 on the graphite sealing ring 10, thereby forming an axial elastic support for the graphite sealing ring 10 and axially locking the axially outer end of the graphite sealing ring 10 and the axially outer groove surface of the graphite sealing ring accommodating groove 21.

[0046] The first sleeve 12, the sealing cover 6, the carbon ring sealing seat 8, the graphite sealing ring 10, and the spring 11 together form a carbon ring sealing structure, which is equivalent to a labyrinth sealing structure. When the impeller shaft rotates, an air film is formed between the graphite sealing ring and the first sleeve. The air film acts as an isolation seal for the gas medium flowing through it through the effect of throttling and reducing pressure, thereby preventing the gas from leaking outward through the position between the graphite sealing ring and the impeller shaft.

[0047] Specifically, when the gas flows through the small gap (usually 0.01 mm - 0.04 mm) between the graphite sealing ring 10 and the impeller shaft 1, the gas pressure gradually decreases due to the viscosity and throttling effect of the gas, thereby preventing the gas from leaking.

[0048] In addition, when some tiny foreign matter in the gas enters the carbon ring sealing structure through the gap between the second sleeve and the side plate, the tiny foreign matter in the gas will not damage the graphite sealing ring due to the high hardness of the graphite sealing ring, thereby ensuring that the graphite sealing ring continues to have efficient sealing performance, and the graphite sealing ring can isolate the foreign matter.

[0049] An auxiliary wall plate 7 is fixedly provided on the outer circumference of the carbon ring sealing seat 8, a main wall plate 5 is provided on the axial outer side of the auxiliary wall plate 7, and the auxiliary wall plate 7 and the main wall plate 5 are fixedly connected at the axial inner position.

[0050] A side plate 15 is disposed on the outer circumference of the second sleeve 14 , and a gap is disposed between the outer circumference of the second sleeve 14 and the side plate 15 .

[0051] The side plate 15 is a stepped shaft structure, the outer circumference of the inner shaft section of the side plate 15 is fixedly connected to the inner circumference of the axial inner position of the auxiliary wall plate 7, and the axial outer end of the outer shaft section of the side plate 15 is fixedly connected to the axial inner end of the auxiliary wall plate 7.

[0052] A bearing seat 3 is provided on the outer circumference of the outer ring of the bearing 2. The outer circumference of the outer ring of the bearing 2 and the outer side of the inner circumference of the bearing seat 3 are fixedly connected. The inner side of the inner circumference of the bearing seat 3 is located at a radially symmetrical position of the third sleeve 18. A bearing isolator 17 is provided between the inner side of the inner circumference of the bearing seat 3 and the third sleeve 18. The bearing isolator 17 can isolate the lubricating oil in the oil tank and prevent the lubricating oil in the oil tank from entering the carbon ring sealing structure, thereby affecting the sealing performance of the carbon ring sealing structure.

[0053] The outer circumference of the bearing seat 3 and the inner circumference of the axial outer end of the main wall panel 5 are fixedly connected.

[0054] There are multiple graphite sealing ring accommodating grooves 21 on the carbon ring sealing seat 8. The multiple graphite sealing ring accommodating grooves 21 are axially arranged on the inner circumference of the carbon ring sealing seat 8 to form a labyrinth sealing structure, which can further improve the sealing performance of the carbon ring sealing structure.

[0055] The number of the graphite sealing ring accommodating grooves 21 on the carbon ring sealing seat 8 is three, which can ensure that the carbon ring sealing structure has excellent sealing performance and reduce the manufacturing cost.

[0056] A sealing ring receiving groove is provided on the outer circumference of the bearing seat 3, and a first sealing ring 4 is provided in the sealing ring receiving groove. The outer circumference of the bearing seat 3 and the inner circumference of the axial outer end of the main wall panel 5 are sealed and fixed by the first sealing ring 4.

[0057] The outer circumference of the carbon ring sealing seat 8 is provided with a sealing ring receiving groove, and a second sealing ring 9 is provided in the sealing ring receiving groove. The outer circumference of the carbon ring sealing seat 8 and the inner circumference of the auxiliary wall plate 7 are sealed and fixed by the second sealing ring 9.

[0058] The inner circumference of the first sleeve 12 is provided with a sealing ring receiving groove, and a third sealing ring 13 is provided in the sealing ring receiving groove. The inner circumference of the first sleeve 12 and the outer circumference of the impeller shaft 1 are sealed and fixed by the third sealing ring 13 .

[0059] The axially outer end face of the outer shaft section of the side plate 15 is provided with a sealing ring receiving groove, and a fourth sealing ring 16 is provided in the sealing ring receiving groove. The axially outer end face of the outer shaft section of the side plate 15 and the axially inner end of the auxiliary wall plate 7 are sealed and fixed by the fourth sealing ring 16.

[0060] By arranging sealing rings at the above-mentioned corresponding positions, it is possible to effectively prevent gas and lubricating oil from leaking outward from the corresponding gaps.

[0061] The main wall panel 5 and the auxiliary wall panel 7 are locked and fixed by locking screws 19, the sealing cover 6 and the carbon ring sealing seat 8 are locked and fixed by locking screws 19, and the side panel 15 and the auxiliary wall panel 7 are locked and fixed by locking screws 19. By using locking screws 19 to lock and fix the above-mentioned components, the corresponding components can be quickly disassembled, assembled, and repaired, thereby improving work efficiency and saving operation time.

[0062] The size of the gap between the outer circumference of the second sleeve 14 and the inner circumference of the side plate 15 is 0.2 mm ± 0.02 mm, which can effectively block the entry of particles in the gas and prevent particles in the gas from entering the interior and causing damage to related internal components.

[0063] The outer circumference of the second sleeve 14 is provided with a plurality of grooves 20, and the plurality of grooves 20 are arranged axially on the outer circumference of the second sleeve 14, and the plurality of grooves 20 form a comb-tooth structure, which is also equivalent to a labyrinth sealing structure. When the gas flows to the position of the second sleeve, the gas enters into the comb-tooth structure through the gap between the outer circumference of the second sleeve and the inner circumference of the side plate, and the comb-tooth structure has an effective sealing effect on the incoming gas.

[0064] However, what is described above is only a specific embodiment of the present invention and should not be used to limit the scope of implementation of the present invention. Therefore, the replacement of equivalent components, or equivalent changes and modifications made according to the scope of protection of the patent of the present invention should still fall within the scope covered by the claims of the present invention.

Claims

1. A Roots blower with a carbon ring seal structure, characterized in that: An impeller shaft is provided, and a bearing, a third sleeve, a first sleeve, and a second sleeve are fixedly provided on the outer circumference of the impeller shaft in sequence from the outside to the inside, and the inner ring of the bearing, the third sleeve, the first sleeve, and the second sleeve are axially locked in sequence on the outer circumference of the impeller shaft; A carbon ring sealing seat is provided on the outer circumference of the first shaft sleeve, a graphite sealing ring receiving groove is provided on the inner circumference of the carbon ring sealing seat, and a spring receiving groove is provided on the axial inner groove surface of the graphite sealing ring receiving groove; A graphite sealing ring is arranged inside the graphite sealing ring receiving groove, the inner circumference of the graphite sealing ring is tightly fitted with the outer circumference of the first sleeve, and a spring receiving groove is arranged at the axial inner end of the graphite sealing ring; The spring receiving groove on the graphite sealing ring and the spring receiving groove inside the graphite sealing ring receiving groove are axially symmetrically arranged, a spring is arranged between the two spring receiving grooves, one end of the spring is fixedly connected to the spring receiving groove inside the graphite sealing ring receiving groove, and the other end of the spring is elastically connected to the spring receiving groove on the graphite sealing ring, forming an axial elastic force support for the graphite sealing ring, and axially locking the axial outer end of the graphite sealing ring and the axial outer groove surface of the graphite sealing ring receiving groove; A sealing gland is fixedly provided at the axial outer end of the carbon ring sealing seat, a groove is provided at the middle position of the axial inner end surface of the sealing gland, a graphite sealing ring receiving groove is formed between the groove and the adjacent position of the axial outer end of the carbon ring sealing seat, a graphite sealing ring is provided inside the graphite sealing ring receiving groove, the inner circumference of the graphite sealing ring is tightly fitted with the outer circumference of the first shaft sleeve, and a spring receiving groove is provided at the axial inner end of the graphite sealing ring; The axial outer end of the carbon ring sealing seat is located at a position axially corresponding to the spring receiving groove of the axial inner end of the graphite sealing ring, and a spring receiving groove is provided. The spring is located between the two spring receiving grooves. One end of the spring is fixedly connected to the spring receiving groove of the axial outer end of the carbon ring sealing seat, and the other end of the spring is elastically connected to the spring receiving groove on the graphite sealing ring, so as to form an axial elastic force support for the graphite sealing ring, and axially lock the axial outer end of the graphite sealing ring and the axial outer groove surface of the graphite sealing ring receiving groove; The first shaft sleeve, the sealing gland, the carbon ring sealing seat, the graphite sealing ring and the spring together form a carbon ring sealing structure; An auxiliary wall plate is fixedly provided on the outer circumference of the carbon ring sealing seat, a main wall plate is provided on the axial outer side of the auxiliary wall plate, and the auxiliary wall plate is fixedly connected to the axial inner side of the main wall plate; The outer circumference of the second sleeve is provided with a side plate, and a gap is provided between the outer circumference of the second sleeve and the side plate; The side plate is a stepped shaft structure, the outer circumference of the inner shaft section of the side plate is fixedly connected to the inner circumference of the axial inner position of the auxiliary wall plate, and the axial outer end of the outer shaft section of the side plate is fixedly connected to the axial inner end of the auxiliary wall plate; The outer circumference of the bearing outer ring of the bearing is provided with a bearing seat, the outer circumference of the bearing outer ring of the bearing is fixedly connected to the outer side of the inner circumference of the bearing seat, the inner side of the inner circumference of the bearing seat is located at a radially symmetrical position of the third sleeve, and a bearing isolator is provided between the inner side of the inner circumference of the bearing seat and the third sleeve; The outer circumference of the bearing seat is fixedly connected to the inner circumference of the axial outer end of the main wall panel.

2. The Roots blower with a carbon ring seal structure according to claim 1, characterized in that: There are multiple graphite sealing ring accommodating grooves on the carbon ring sealing seat, and the multiple graphite sealing ring accommodating grooves are axially arranged on the inner circumference of the carbon ring sealing seat.

3. The Roots blower with a carbon ring seal structure according to claim 2, characterized in that: The number of the graphite sealing ring accommodating grooves on the carbon ring sealing seat is three.

4. The Roots blower with a carbon ring seal structure according to claim 1, characterized in that: The outer circumference of the bearing seat is provided with a sealing ring receiving groove, and a first sealing ring is provided in the sealing ring receiving groove. The outer circumference of the bearing seat and the inner circumference of the axial outer end of the main wall plate are sealed and fixed by the first sealing ring; The outer circumference of the carbon ring sealing seat is provided with a sealing ring receiving groove, a second sealing ring is provided in the sealing ring receiving groove, and the outer circumference of the carbon ring sealing seat and the inner circumference of the auxiliary wall plate are sealed and fixed by the second sealing ring; The inner circumference of the first shaft sleeve is provided with a sealing ring receiving groove, a third sealing ring is provided in the sealing ring receiving groove, and the inner circumference of the first shaft sleeve and the outer circumference of the impeller shaft are sealed and fixed by the third sealing ring; The axial outer end surface of the outer shaft section of the side plate is provided with a sealing ring accommodating groove, and a fourth sealing ring is arranged in the sealing ring accommodating groove. The axial outer end surface of the outer shaft section of the side plate and the axial inner end portion of the auxiliary wall plate are sealed and fixed by the fourth sealing ring.

5. The Roots blower with a carbon ring seal structure according to claim 1, characterized in that: The main wall panel and the auxiliary wall panel are locked and fixed by locking screws; The sealing gland and the carbon ring sealing seat are locked and fixed by locking screws; The side panels and the auxiliary wall panels are locked and fixed by locking screws.

6. The Roots blower with a carbon ring seal structure according to claim 1, characterized in that: The size of the gap between the outer circumference of the second sleeve and the inner circumference of the side plate is 0.2 mm±0.02 mm.

7. The Roots blower with a carbon ring seal structure according to claim 6, characterized in that: The outer circumference of the second sleeve is provided with a plurality of grooves, and the plurality of grooves are arranged axially on the outer circumference of the second sleeve, and the plurality of grooves form a comb-tooth structure.

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