Roots blower with combined sealing structure

Abstract

The utility model provides a Roots blower with a combined sealing structure, which comprises a blower wall plate and a rotating shaft, a bearing is arranged between the blower wall plate and the rotating shaft, a bearing outer ring of the bearing is fixedly connected with the inner surface of the blower wall plate, a bearing inner ring of the bearing is fixedly connected with the outer surface of the rotating shaft, and a shaft shoulder is arranged on the rotating shaft. A first sealing bush and a second sealing bush are arranged between the shaft shoulder and a bearing inner ring of the bearing, the first sealing bush and the second sealing bush are fixedly connected with the outer surface of the rotating shaft, and a sealing seat is arranged on the axial inner side end face of a bearing outer ring of the bearing. The roots blower solves the problems that an existing roots blower adopts labyrinth sealing, packing sealing and mechanical sealing to conduct medium gas sealing, the sealing structure is complex, the manufacturing cost is high, the operation process is tedious, and abrasion is prone to occurring. The sealing device can be widely applied to sealing of lubricating oil and medium gas in the roots blower.

Description

Technical Field

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

[0002] Blowers are often used in metallurgy, chemical industry, food, building materials, mines, textiles, gas stations, pneumatic transportation, sewage treatment and other fields as necessary blowing equipment for transporting gas, while Roots blowers are mostly used to transport harmful gases, dangerous gases or precious gases, so Roots blowers require strict sealing devices to reduce gas leakage.

[0003] Currently, commonly used sealing structures include labyrinth seals, packing seals and mechanical seals. Among them, the use of labyrinth seal structure will result in a large amount of medium gas leakage, and is only suitable for conveying air-type media. Mechanical seals have a complex structure, high manufacturing cost, and are easy to wear. Packing seals require external packing media and the introduction of other substances, and the operation process is cumbersome.

[0004] At the same time, in order to ensure the long-term stable operation of the Roots blower, high requirements are placed on the lubrication and heat dissipation of its internal components and the sealing of the internal lubricating oil. Utility Model Content

[0005] In view of the above technical problems, the utility model provides a Roots blower with a combined sealing structure. The Roots blower with the combined sealing structure has a compact structure, low manufacturing cost, good sealing effect, and wear resistance. Moreover, the Roots blower with the combined sealing structure can play a good sealing role for the lubricating oil inside the blower, and can also realize the circulating cooling of the lubricating oil, increase the lubrication and heat dissipation effect of internal parts, and ensure that the Roots blower can operate stably for a long time.

[0006] To this end, the technical solution of the utility model is a Roots blower with a combined sealing structure, comprising a blower wall panel and a rotating shaft, a bearing is arranged between the blower wall panel and the rotating shaft, a bearing outer ring of the bearing is fixedly connected to the inner surface of the blower wall panel, a bearing inner ring of the bearing is fixedly connected to the outer surface of the rotating shaft, a shaft shoulder is arranged on the rotating shaft, a first sealing bushing and a second sealing bushing are arranged between the shaft shoulder and the bearing inner ring of the bearing, and the first sealing bushing and the second sealing bushing are respectively fixedly connected to the outer surface of the rotating shaft;

[0007] The axial outer end face of the second sealing bushing is fixedly connected to the axial inner end face of the bearing inner ring of the bearing, the axial inner end face of the second sealing bushing is fixedly connected to the axial outer end face of the first sealing bushing, the axial inner end face of the first sealing bushing is fixedly connected to the shaft shoulder, the axial outer end face of the bearing inner ring of the bearing is provided with a locking sleeve, the locking sleeve is fixedly connected to the outer surface of the rotating shaft, and the locking sleeve, the bearing inner ring of the bearing, the second sealing bushing, the first sealing bushing, and the shaft shoulder are axially locked and fixed;

[0008] A sealing seat is provided on the axial inner end surface of the bearing outer ring of the bearing, and the sealing seat includes a sealing seat front end oil return section located at the front end position, and a sealing seat rear end discharge section is fixedly provided at the rear end of the sealing seat front end oil return section;

[0009] The oil return section at the front end of the sealing seat is axially fixedly connected to the outer ring of the bearing, the outer surface of the oil return section at the front end of the sealing seat is fixedly connected to the inner surface of the blower wall panel, an oil seal is arranged between the inner surface of the oil return section at the front end of the sealing seat and the outer surface of the second sealing bushing, the inner surface of the oil return section at the front end of the sealing seat is fixedly connected to the outer surface of the oil seal, and the outer surface of the second sealing bushing is rotatably fixedly connected to the inner surface of the oil seal;

[0010] A sealing seat oil return groove is provided on the front end surface of the front end oil return section of the sealing seat, and a wall plate oil return channel hole is provided at a position near the sealing seat oil return groove on the blower wall plate, the wall plate oil return channel hole and the sealing seat oil return groove are interconnected, and the other end of the wall plate oil return channel hole is connected to the blower oil tank;

[0011] The outer surface of the rear end discharge section of the sealing seat is fixedly connected to the inner surface of the blower wall panel, the interior of the rear end discharge section of the sealing seat near the front end is provided with a sealing seat chip discharge groove arranged along the circumferential direction, the sealing seat chip discharge groove is provided with a radially penetrating sealing seat discharge hole, and the inner surface of the rear end discharge section of the sealing seat near the rear end is rotatably sealed and connected to the outer surface of the first sealing bushing;

[0012] The blower wall panel is provided with a wall panel drainage channel at a radial position of the drainage section at the rear end of the sealing seat, the wall panel drainage channel and the sealing seat drainage hole are interconnected, and the wall panel drainage channel radially penetrates to the outer surface of the blower wall panel;

[0013] A medium gas retaining ring is provided at the front end position of the second sealing sleeve near one side of the first sealing sleeve. The medium gas retaining ring extends outward along the circumferential direction. The medium gas retaining ring is located in the middle position of the chip groove of the sealing seat. The outer diameter of the medium gas retaining ring is larger than the outer diameter of the first sealing sleeve.

[0014] Preferably, a piston ring is provided between the inner surface of the rear end discharge section of the sealing seat near the rear end position and the outer surface of the first sealing sleeve, and the inner surface of the rear end discharge section of the sealing seat near the rear end position and the outer surface of the first sealing sleeve are connected by a rotating seal through the piston ring.

[0015] Preferably, a threaded connection hole is provided in the wall panel sewage discharge channel near the outer surface of the blower wall panel.

[0016] Preferably, a second oil sealing ring is provided between the inner surface of the second sealing bushing and the outer surface of the rotating shaft, and the inner surface of the second sealing bushing and the outer surface of the rotating shaft are sealed and fixedly connected via the second oil sealing ring.

[0017] Preferably, a first oil sealing ring is provided between the second sealing bushing and the first sealing bushing, and the second sealing bushing and the first sealing bushing are sealed and locked by the first oil sealing ring, and the first oil sealing ring is also sealed and connected to the outer surface of the rotating shaft.

[0018] Preferably, the locking sleeve and the rotating shaft are connected by threads to axially lock and fix the locking sleeve, the inner ring of the bearing, the second sealing sleeve, the first sealing sleeve, and the shaft shoulder.

[0019] The beneficial effects of the utility model are:

[0020] 1. A sealing seat oil return groove is provided on the front end face of the oil return section at the front end of the sealing seat, and a wall panel oil return channel hole is provided on the blower wall panel near the sealing seat oil return groove. When the blower rotates, the lubricating oil thrown out from the back of the bearing flows along the sealing seat oil return groove to the wall panel oil return channel hole, and then flows back to the blower oil tank along the wall panel oil return channel hole. The entire reflux process will reduce the temperature of the lubricating oil. The cooled lubricating oil enters the interior of the blower again, which can not only lubricate the relevant parts inside the blower, but also play a role in heat dissipation.

[0021] 2. By arranging a piston ring between the inner surface of the rear end discharge section of the sealing seat near the rear end position and the outer surface of the first sealing bushing, a good isolation and sealing effect can be achieved for the medium gas inside the blower, preventing the medium gas from leaking out of the gap between the rear end discharge section of the sealing seat and the first sealing bushing.

[0022] 3. By setting the medium gas retaining ring, the sealing seat discharge hole and the wallboard drainage channel, when a small amount of medium gas leaks out from the gap between the rear end discharge section of the sealing seat and the first sealing bushing, the medium gas retaining ring can prevent the medium gas from flowing toward the oil seal, and guide the medium gas into the sealing seat discharge hole, and then discharge it outward through the wallboard drainage channel, so as to prevent the leaked medium gas from flowing to the oil seal position, causing damage to the oil seal, reducing the sealing performance of the oil seal, and causing oil leakage;

[0023] Furthermore, since a threaded connection hole is provided at a position of the wall panel sewage discharge channel close to the outer surface of the blower wall panel, when the transported medium gas is a harmful gas or the medium gas has the characteristic of being pre-cooled to become a liquid, a pipeline can be connected at the threaded connection hole to transport the medium gas to a designated safe storage area to prevent the medium gas from causing damage to the external environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a cross-sectional view of the combined sealing structure of the utility model;

[0025] Figure 2 It is a three-dimensional structural schematic diagram of the sealing seat of the utility model.

[0026] Explanation of symbols in the figure:

[0027] 1. Blower wall panel; 101. Wall panel oil return channel hole; 102. Wall panel sewage channel; 103. Threaded connection hole; 2. Locking sleeve; 3. Bearing; 4. Seal seat; 401. Seal seat oil return groove; 402. Seal seat chip groove; 403. Seal seat drainage hole; 404. Seal seat front end oil return section; 405. Seal seat rear end drainage section; 5. Oil seal; 6. Piston ring; 7. First sealing bushing; 8. First oil sealing ring; 9. Second oil sealing ring; 10. Second sealing bushing; 1001. Medium gas retaining ring; 11. Rotating shaft; 12. Shoulder. DETAILED DESCRIPTION

[0028] The utility model is further described below in conjunction with embodiments.

[0029] pass Figure 1-Figure 2 It can be seen that the Roots blower with a combined sealing structure includes a blower wall panel 1 and a rotating shaft 11, a bearing 3 is provided between the blower wall panel 1 and the rotating shaft 11, the bearing outer ring of the bearing 3 is fixedly connected to the inner surface of the blower wall panel 1, the bearing inner ring of the bearing 3 is fixedly connected to the outer surface of the rotating shaft 11, a shoulder 12 is provided on the rotating shaft 11, a first sealing bushing 7 and a second sealing bushing 10 are provided between the shoulder 12 and the bearing inner ring of the bearing 3, and the first sealing bushing 7 and the second sealing bushing 10 are respectively fixedly connected to the outer surface of the rotating shaft 11.

[0030] The axially outer end face of the second sealing sleeve 10 is fixedly connected to the axially inner end face of the bearing inner ring of the bearing 3, the axially inner end face of the second sealing sleeve 10 is fixedly connected to the axially outer end face of the first sealing sleeve 7, the axially inner end face of the first sealing sleeve 7 is fixedly connected to the shaft shoulder 12, the axially outer end face of the bearing inner ring of the bearing 3 is provided with a locking sleeve 2, the locking sleeve 2 and the outer surface of the rotating shaft 11 are fixedly connected, and the locking sleeve 2, the bearing inner ring of the bearing 3, the second sealing sleeve 10, the first sealing sleeve 7 and the shaft shoulder 12 are axially locked and fixed.

[0031] A sealing seat 4 is provided on the axial inner end face of the bearing outer ring of the bearing 3. The sealing seat 4 includes a sealing seat front oil return section 404 located at the front end position, and a sealing seat rear end discharge section 405 is fixedly provided at the rear end of the sealing seat front oil return section 404.

[0032] The oil return section 404 at the front end of the sealing seat and the bearing outer ring of the bearing 3 are axially fixedly connected, and the outer surface of the oil return section 404 at the front end of the sealing seat is also fixedly connected to the inner surface of the blower wall panel 1, and an oil seal 5 is provided between the inner surface of the oil return section 404 at the front end of the sealing seat and the outer surface of the second sealing bushing 10, and the inner surface of the oil return section 404 at the front end of the sealing seat and the outer surface of the oil seal 5 are fixedly connected, and the outer surface of the second sealing bushing 10 and the inner surface of the oil seal 5 are rotationally fixedly connected.

[0033] A sealing seat oil return groove 401 is provided on the front end face of the front end oil return section 404 of the sealing seat, and a wall panel oil return channel hole 101 is provided on the blower wall panel 1 near the sealing seat oil return groove 401. The wall panel oil return channel hole 101 and the sealing seat oil return groove 401 are interconnected, and the other end of the wall panel oil return channel hole 101 is connected to the blower oil tank.

[0034] The outer surface of the rear end discharge section 405 of the sealing seat is fixedly connected to the inner surface of the blower wall panel 1, and the interior of the rear end discharge section 405 of the sealing seat near the front end position is provided with a sealing seat chip discharge groove 402 arranged along the circumferential direction, and the sealing seat chip discharge groove 402 is provided with a radially penetrating sealing seat discharge hole 403, and the inner surface of the rear end discharge section 405 of the sealing seat near the rear end position is rotationally sealed and connected to the outer surface of the first sealing bushing 7.

[0035] Specifically, a piston ring 6 is provided between the inner surface of the rear end discharge section 405 of the sealing seat near the rear end position and the outer surface of the first sealing sleeve 7. The inner surface of the rear end discharge section 405 of the sealing seat near the rear end position and the outer surface of the first sealing sleeve 7 are rotationally sealed and connected via the piston ring 6. The piston ring 6 can play a good isolating and sealing role for the medium gas inside the blower, preventing the medium gas from leaking out from the gap between the rear end discharge section 405 of the sealing seat and the first sealing sleeve 7.

[0036] The blower wall panel 1 is provided with a wall panel drainage channel 102 at a radial position of the drainage section 405 at the rear end of the sealing seat. The wall panel drainage channel 102 and the sealing seat drainage hole 403 are interconnected, and the wall panel drainage channel 102 radially penetrates to the outer surface of the blower wall panel 1.

[0037] When the blower rotates, the oil seal 5 can block the lubricating oil thrown out from the bearing 3, so that the lubricating oil thrown out from the bearing 3 flows back to the blower oil tank along the seal seat return oil groove 401 and the wall panel return oil channel hole 101. In addition, the entire reflux process will reduce the temperature of the lubricating oil. The cooled lubricating oil enters the blower again, lubricating the relevant internal parts of the blower while also playing a role in heat dissipation, preventing the lubricating oil thrown out from the bearing 3 from flowing along the seal seat drain hole 403 and the wall panel drain channel 102 to the external environment, resulting in a gradual reduction of the lubricating oil in the blower oil tank and insufficient lubrication of the internal parts of the blower.

[0038] A dielectric gas retaining ring 1001 is provided at the front end position of the second sealing bushing 10 close to the first sealing bushing 7. The dielectric gas retaining ring 1001 extends outward along the circumferential direction. The dielectric gas retaining ring 1001 is located in the middle position of the sealing seat chip groove 402. The outer diameter of the dielectric gas retaining ring 1001 is greater than the outer diameter of the first sealing bushing 7.

[0039] When a small amount of dielectric gas leaks out from the gap between the discharge section 405 at the rear end of the sealing seat and the first sealing bushing 7, the dielectric gas retaining ring 1001 can prevent the dielectric gas from flowing toward the oil seal, and guide the dielectric gas into the discharge hole 403 of the sealing seat, and then discharge it outward through the wall panel drainage channel 102, thereby preventing the leaked dielectric gas from flowing to the oil seal position, causing damage to the oil seal, reducing the sealing performance of the oil seal, and causing oil leakage.

[0040] A threaded connection hole 103 is provided at a position of the wall panel drain channel 102 close to the outer surface of the blower wall panel 1 .

[0041] When the medium gas being transported is harmful gas or has the property of changing into liquid state by pre-cooling, a pipeline can be connected at the threaded connection hole 103 to transport the medium gas to a designated safe storage area to prevent the medium gas from causing harm to the external environment.

[0042] A second oil sealing ring 9 is provided between the inner surface of the second sealing bushing 10 and the outer surface of the rotating shaft 11, and the inner surface of the second sealing bushing 10 and the outer surface of the rotating shaft 11 are sealed and fixedly connected via the second oil sealing ring 9. A first oil sealing ring 8 is provided between the second sealing bushing 10 and the first sealing bushing 7, and the second sealing bushing 10 and the first sealing bushing 7 are sealed and locked and fixed via the first oil sealing ring 8. The first oil sealing ring 8 is also sealed and connected to the outer surface of the rotating shaft 11.

[0043] The first oil sealing ring 8 and the second oil sealing ring 9 can effectively prevent the medium gas from leaking out from the gaps between the first sealing bushing 7, the second sealing bushing 10 and the rotating shaft 11, and further ensure that the medium gas can be smoothly guided into the sealing seat drain hole 403 and then discharged outward through the wall panel drain channel 102.

[0044] The locking sleeve 2 and the rotating shaft 11 are connected by threads, and the locking sleeve 2, the inner ring of the bearing 3, the second sealing sleeve 10, the first sealing sleeve 7, and the shaft shoulder 12 are axially locked and fixed. By setting the locking sleeve 2 and the rotating shaft 11 as a threaded connection, the related parts can be easily disassembled, maintained and repaired, and the whole disassembly and assembly process is simple and quick.

[0045] The oil seal 5 is made of polytetrafluoroethylene, which has the characteristics of wear resistance and high temperature resistance, can extend the service life of the oil seal 5, increase the barrier sealing effect, and ensure that the Roots blower can operate stably for a long time.

[0046] The first sealing bushing 7 and the second sealing bushing 10 are both made of 20CrMnTi alloy steel. After heat treatment, the 20CrMnTi alloy steel has the characteristics of high hardness and high wear resistance, which prolongs the service life of the first sealing bushing 7 and the second sealing bushing 10 and ensures that the Roots blower can operate stably for a long time.

[0047] 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 combined sealing structure, characterized in that: It comprises a blower wall panel and a rotating shaft, a bearing is arranged between the blower wall panel and the rotating shaft, the outer ring of the bearing is fixedly connected to the inner surface of the blower wall panel, the inner ring of the bearing is fixedly connected to the outer surface of the rotating shaft, a shaft shoulder is arranged on the rotating shaft, a first sealing bushing and a second sealing bushing are arranged between the shaft shoulder and the inner ring of the bearing, and the first sealing bushing and the second sealing bushing are respectively fixedly connected to the outer surface of the rotating shaft; The axial outer end surface of the second sealing bushing is fixedly connected to the axial inner end surface of the bearing inner ring of the bearing, the axial inner end surface of the second sealing bushing is fixedly connected to the axial outer end surface of the first sealing bushing, the axial inner end surface of the first sealing bushing is fixedly connected to the shaft shoulder, the axial outer end surface of the bearing inner ring of the bearing is provided with a locking sleeve, the locking sleeve is fixedly connected to the outer surface of the rotating shaft, and the locking sleeve, the bearing inner ring of the bearing, the second sealing bushing, the first sealing bushing, and the shaft shoulder are axially locked and fixed; A sealing seat is provided on the axial inner end surface of the bearing outer ring of the bearing, and the sealing seat includes a sealing seat front end oil return section located at the front end position, and a sealing seat rear end discharge section is fixedly provided at the rear end of the sealing seat front end oil return section; The front end oil return section of the sealing seat is axially fixedly connected to the outer ring of the bearing, the outer surface of the front end oil return section of the sealing seat is fixedly connected to the inner surface of the blower wall panel, an oil seal is arranged between the inner surface of the front end oil return section of the sealing seat and the outer surface of the second sealing bushing, the inner surface of the front end oil return section of the sealing seat is fixedly connected to the outer surface of the oil seal, and the outer surface of the second sealing bushing is rotationally fixedly connected to the inner surface of the oil seal; A sealing seat oil return groove is provided on the front end surface of the front end oil return section of the sealing seat, and a wallboard oil return channel hole is provided on the blower wallboard near the sealing seat oil return groove, the wallboard oil return channel hole and the sealing seat oil return groove are connected to each other, and the other end of the wallboard oil return channel hole is connected to the blower oil tank; The outer surface of the rear end discharge section of the sealing seat is fixedly connected to the inner surface of the blower wall panel, the inner part of the rear end discharge section of the sealing seat near the front end is provided with a sealing seat chip removal groove arranged along the circumferential direction, the sealing seat chip removal groove is provided with a sealing seat discharge hole penetrating radially, and the inner surface of the rear end discharge section of the sealing seat near the rear end is rotatably sealed and connected to the outer surface of the first sealing bushing; The blower wallboard is provided with a wallboard drainage channel at a radial position of the drainage section at the rear end of the sealing seat, the wallboard drainage channel and the sealing seat drainage hole are connected to each other, and the wallboard drainage channel radially penetrates to the outer surface of the blower wallboard; A medium gas retaining ring is provided at the front end position of the second sealing bushing close to one side of the first sealing bushing. The medium gas retaining ring extends outward along the circumferential direction. The medium gas retaining ring is located in the middle position of the chip removal groove of the sealing seat. The outer diameter of the medium gas retaining ring is larger than the outer diameter of the first sealing bushing.

2. The Roots blower with a combined sealing structure according to claim 1, characterized in that: A piston ring is provided between the inner surface of the rear end discharge section of the sealing seat near the rear end position and the outer surface of the first sealing sleeve, and the inner surface of the rear end discharge section of the sealing seat near the rear end position and the outer surface of the first sealing sleeve are connected by a piston ring for rotational sealing.

3. The Roots blower with a combined sealing structure according to claim 1, characterized in that: The wallboard sewage discharge channel is provided with a threaded connection hole at a position close to the outer surface of the blower wallboard.

4. The Roots blower with a combined sealing structure according to claim 1, characterized in that: A second oil sealing ring is provided between the inner surface of the second sealing bushing and the outer surface of the rotating shaft, and the inner surface of the second sealing bushing and the outer surface of the rotating shaft are sealed and fixedly connected via the second oil sealing ring.

5. The Roots blower with a combined sealing structure according to claim 1, characterized in that: A first oil sealing ring is provided between the second sealing bushing and the first sealing bushing. The second sealing bushing and the first sealing bushing are sealed and locked by the first oil sealing ring. The first oil sealing ring is also sealed and connected to the outer surface of the rotating shaft.

6. The Roots blower with a combined sealing structure according to claim 1, characterized in that: The locking sleeve and the rotating shaft are connected by threads, so that the locking sleeve, the inner ring of the bearing, the second sealing sleeve, the first sealing sleeve and the shaft shoulder are axially locked and fixed.

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