Sealing device of fan and Roots fan

Abstract

The utility model relates to a sealing device of a fan and a Roots fan. The utility model discloses a sealing device of a fan. The sealing device comprises a shaft sleeve, a shaft seat, at least two piston rings, a framework oil seal and an end cover, sealing rings are arranged on the inner walls of the shaft sleeves. The shaft seat sleeves the outer wall of the shaft sleeve; a mounting groove is formed in the inner wall of the shaft seat. The at least two piston rings are installed between the shaft sleeve and the shaft seat and serve as first sealing positions. The framework oil seal is arranged in the mounting groove, and the framework oil seal is arranged on the shaft sleeve in a sleeving mode and serves as a second sealing position; and the end cover sleeves the outer wall of the shaft sleeve. The piston ring forms the first sealing position, the framework oil seal forms the second sealing position, the composite sealing structure is formed, the sufficient sealing effect is guaranteed, and the risk that sealing liquid of an existing sealing device leaks is avoided due to the structural characteristics of the piston ring and the framework oil seal. Therefore, the service life of the sealing device is prolonged, and the overhaul and disassembly frequency is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to fan sealing device technical field, especially a kind of sealing device and Roots blower of fan. BACKGROUND

[0002] Roots vacuum pump is also called Roots blower, which is widely used in chemical industry, pharmacy, food industry and other industries. Roots blower generally includes pump body, impeller, gear set and other components. The impeller is arranged in the pump body, and the transmission shaft of the impeller penetrates the pump body and is connected with the gear set, and then the impeller is driven to rotate by the power source. Since the impeller needs to compress and transport gas in the pump body, the sealing between the transmission shaft of the impeller and the pump body is crucial. The existing Roots blower generally uses labyrinth sealing method for shaft sealing: the labyrinth structure and the sealing liquid filled in the labyrinth are used to prevent the penetration and leakage of gas and liquid. The internal pressure of Roots blower is relatively large, and the sealing effect of such sealing structure is poor. Moreover, after being used for a period of time, there is also a problem of leakage of sealing liquid in the labyrinth. The pump body and the matching motor of Roots blower are relatively large, and it is very difficult to disassemble the sealing device after leakage, which is time-consuming and laborious. SUMMARY

[0003] Therefore, it is necessary to provide a sealing device for fan and Roots blower to solve the problems of poor sealing effect and easy leakage of the existing fan sealing device.

[0004] In a first aspect, the utility model discloses a sealing device for fan, which comprises a shaft sleeve, a shaft seat, at least two piston rings, a skeleton oil seal and an end cover.

[0005] The inner wall of the shaft sleeve is provided with a sealing ring. The shaft seat is sleeved on the outer wall of the shaft sleeve; the inner wall of the shaft seat is provided with a mounting groove. The at least two piston rings are installed between the shaft sleeve and the shaft seat. The at least two piston rings are located at one end of the shaft seat, serving as a first sealing position. The skeleton oil seal is arranged in the mounting groove, and the skeleton oil seal is sleeved on the shaft sleeve, serving as a second sealing position. The end cover is sleeved on the outer wall of the shaft sleeve. The end cover is also connected to the other end of the shaft seat.

[0006] As a preferred example, the skeleton oil seal comprises a bracket part, a first sealing lip, a second sealing lip and a pressurizing part.

[0007] The bracket part and the groove bottom surface of the mounting groove form a first sealing pair; the first extrusion surface is arranged on the bracket part.

[0008] One end of the first sealing lip is connected to the bracket part. The second extrusion surface is arranged on the first sealing lip. There is an acute angle between the first extrusion surface and the second extrusion surface. The first sealing lip and the outer wall of the shaft sleeve form a second sealing pair.

[0009] One end of the second sealing lip is connected to the support part. The second sealing lip and the side wall surface of the mounting groove form a third sealing pair.

[0010] The pressurizing part is annular as a whole. The pressurizing part comprises two arc-shaped pressing blocks.

[0011] As a preferred example, the sealing device of the Roots blower further comprises an adjusting structure for applying pressure to the pressing blocks.

[0012] One end of the cylinder is in abutment with the pressing blocks. The adjusting bolts are arranged in the center of the shaft sleeve in a circular manner.

[0013] As a preferred example, the adjusting structure further comprises a plurality of springs.

[0014] The springs are installed one by one between the adjusting bolts and the end of the cylinder.

[0015] As a preferred example, the mounting groove extends to one end of the shaft seat to form a side notch. The side of the mounting groove away from the shaft sleeve is a groove bottom surface. The end cap is used to close the side notch of the mounting groove.

[0016] As a preferred example, the support part comprises an annular metal framework and a rubber layer wrapping the metal framework.

[0017] The rubber layer is in abutment with the groove bottom surface of the mounting groove.

[0018] As a preferred example, the support part comprises a contact part in contact with the mounting groove and a necking part.

[0019] One end of the necking part is connected to the contact part. The first pressing surface is located on the inner wall of the necking part.

[0020] The first sealing lip and the second sealing lip are both connected to the other end of the necking part.

[0021] The side of the first sealing lip away from the shaft sleeve is the second pressing surface.

[0022] As a preferred example, the gap between the end faces of the two pressing blocks is 1-2 mm.

[0023] As a preferred example, two sealing rings are provided and located at both ends of the shaft sleeve.

[0024] In a second aspect, the utility model further provides a Roots blower, which comprises a pump body and a transmission shaft.

[0025] The utility model discloses a beneficial effect lies in:

[0026] 1, the utility model discloses a first sealing position is formed to piston ring, the second sealing position is formed to framework oil seal and is combined into composite sealing structure, has guaranteed enough sealing effect, and due to the structural features of piston ring and framework oil seal itself avoids the risk that the sealing liquid of existing sealing device leaks, thereby increase the usable time of the sealing device, reduces the overhaul dismounting frequency.

[0027] 2, the utility model discloses the improvement to framework oil seal, and the tank bottom surface of installation groove constitutes first sealing pair with the improved framework oil seal, and the second sealing pair is constituted with the outer wall of axle sleeve, and the third sealing pair is constituted with the lateral wall surface of installation groove, and through the cooperation of three sealing pairs, further increase the sealing effect at the sealing position.

[0028] 3, the utility model discloses the setting of framework oil seal and adjusting structure, can be corresponding adjusting to the radial tight force of framework oil seal through adjusting structure while guaranteeing the sealing effect, avoids the oil seal leak, dry friction and other problems that the framework oil seal is too tight or too loose after installation, and simultaneously the adjusting structure can also adjust the position of framework oil seal, guarantees that the framework oil seal is perpendicular to the axis of axle sleeve. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical scheme in the embodiment of the utility model or prior art, the following will briefly introduce the drawing needed to be used in the embodiment or prior art description, and obviously, the drawing in the following description is only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without paying the creative labor

[0030] Figure 1 It is the structural schematic diagram of the sealing device of fan in embodiment 1;

[0031] Figure 2 It is the structural schematic diagram of the sealing device of fan in embodiment 2;

[0032] Figure 3 It is Figure 2 The enlarged view of part A in the middle;

[0033] Figure 4 It is the structural schematic diagram of framework oil seal in embodiment 2;

[0034] Figure 5 It is the schematic diagram of adjusting structure in embodiment 3;

[0035] Figure 6 It is the structural schematic diagram of roots blower in embodiment 4.

[0036] In the figure: shaft sleeve 1, sealing ring 2, shaft seat 3, piston ring 4, skeleton oil seal 5, support part 51, first sealing lip 52, second sealing lip 53, pressurizing part 54, end cover 6, cylinder 7, adjusting bolt 8, spring 9, pump body 10, transmission shaft 11. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0038] It should be noted that when a component is referred to as being "mounted on" another component, it can be directly on the other component or there can be a middle component. When a component is referred to as being "disposed on" another component, it can be directly disposed on the other component or there can be a middle component. When a component is referred to as being "fixed on" another component, it can be directly fixed on the other component or there can be a middle component.

[0039] It should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terminology used in the specification of the present application is only for the purpose of describing specific embodiments and is not intended to limit the present application. The term "or / and" used herein includes any and all combinations of one or more related listed items.

[0041] Example 1

[0042] Please refer to Figure 1The sealing device of the fan includes a shaft sleeve 1, a shaft seat 3, at least two piston rings 4, a skeleton oil seal 5, and an end cover 6. The shaft sleeve 1 is in transition fit with the transmission shaft 11 to be installed. The sealing rings 2 are arranged on the inner wall of the shaft sleeve 1 near both ends. The shaft sleeve 1 is fixed relative to the transmission shaft 11, and the sealing rings 2 arranged at both ends of the shaft sleeve 1 are used for sealing. The sealing rings 2 can be made of fluorine rubber. In addition, two ring grooves are formed in the outer wall of one end of the shaft sleeve 1. Each ring groove is sleeved with a matching piston ring 4.

[0043] The shaft seat 3 is sleeved on the outer wall of the shaft sleeve 1 and rotates relative to the shaft sleeve 1. The outer wall of the shaft seat 3 is fixed on the pump body 10. For example, a key groove is formed on the outer wall of the shaft seat 3, and the shaft seat 3 is fixed by a key connection. Finally, the shaft seat 3 is fixed relative to the pump body 10, and the two are normally sealed, for example, in the form of a sealing ring 2. The shaft seat 3 is installed and matched with the piston ring 4. The piston ring 4 forms a first sealing position between the shaft sleeve 1 and the shaft seat 3. Meanwhile, an installation groove is formed in the inner wall of the shaft seat 3. The groove of the installation groove extends to the end of the shaft seat 3 away from the piston ring 4, forming a side groove to facilitate the disassembly of the structure in the installation groove. The end cover 6 is sleeved on the outer wall of the shaft sleeve 1 and is fixed with the shaft seat 3 through fixing bolts. Meanwhile, the end cover 6 seals the side groove of the installation groove, and the end cover 6 is arranged away from the impeller, and the piston ring 4 is arranged close to the impeller to reduce the dust entering the installation groove.

[0044] The skeleton oil seal 5 is installed in the installation groove. The skeleton oil seal 5 can be an existing skeleton oil seal 5, which is sleeved on the shaft sleeve 1 to form a second sealing position. The skeleton oil seal 5 and the piston ring 4 form a composite sealing structure at two positions. The gas in the pump body 10 needs to pass through the first and second sealing positions in sequence to leak, which ensures sufficient sealing effect. Since the piston ring 4 is a steel sealing element, and the structure of the skeleton oil seal 5 itself has the characteristics, the piston ring 4 and the skeleton oil seal 5 do not need to be filled with sealing liquid such as sealing grease during installation, thereby avoiding the risk of leakage of the sealing liquid of the existing sealing device, increasing the service life of the sealing device, and reducing the disassembly frequency of the maintenance.

[0045] Embodiment 2

[0046] Compared with Embodiment 1, the skeleton oil seal 5 is improved in the embodiment. Please refer to Figure 2 、 Figure 3 and Figure 4The skeleton oil seal 5 is annular as a whole. The improved skeleton oil seal 5 comprises a support part 51, a first sealing lip 52, a second sealing lip 53 and a pressurized part 54.

[0047] Specifically, please refer again to Figure 3 (for the convenience of description, the single-sided structure in Figure 3 is described), the support part 51 comprises a contact part and a necked part, constituting a first sealing pair. The contact part is in contact with the bottom surface of the installation groove (the surface of the installation groove away from the shaft sleeve 1 is the bottom surface) when installed. One end of the necked part is connected with the contact part, and the necked part is necked towards the direction of the shaft sleeve 1. The inner wall of the necked part is provided as a first extrusion surface. Further, the entire support part 51, i.e. the contact part and the necked part, are composed of a metal skeleton and a rubber layer including the metal skeleton. The two are connected by integral molding.

[0048] The first sealing lip 52 is connected with the end of the necked part away from the contact part. The cross-sectional shape of the first sealing lip 52 is not limited, which needs to ensure sufficient strength while making the lip part thereof in contact with the outer wall of the shaft sleeve 1, constituting a second sealing pair. At the same time, the side of the first sealing lip 52 away from the lip thereof, i.e. away from the shaft sleeve 1, is provided as a second extrusion surface. The second extrusion surface is parallel to the axial direction of the shaft sleeve 1 or has an included angle of 30°. It needs to be particularly noted that a included angle space is formed between the first extrusion surface and the second extrusion surface. The included angle of the included angle space is an acute angle, so that the contact part and the lip of the first sealing lip are respectively located at the upper and lower ends of the skeleton oil seal.

[0049] The second sealing lip 53 is also connected with the end of the necked part away from the contact part, but the lip part thereof is towards the left end and constitutes a third sealing pair with the side wall surface of the installation groove. In addition, the first sealing lip 52 and the second sealing lip 53 are both of rubber material and can be integrally molded with the rubber layer of the support part 51.

[0050] The whole of the pressurizing part 54 is annular, but it is composed of two arc-shaped pressing blocks. The two pressing blocks can be assembled to be approximately circular, that is, there is a gap of 1-2 mm between the end faces of the two pressing blocks, so that the two pressing blocks can be close to or away from each other, and meanwhile the two pressing blocks have a certain toughness. The two pressing blocks are oppositely arranged in the angular space between the first extrusion surface and the second extrusion surface. By applying pressure to the pressing blocks from outside, the pressing blocks generate pressure on the first extrusion surface, and the first extrusion surface converts the pressure of the pressing blocks into a first component force towards the first sealing pair and a second component force towards the second sealing pair. The first component force makes the support part 51 (the contact part therein) tightly adhere to the mounting groove. The second component force makes the lip of the first sealing lip 52 tightly adhere to the shaft sleeve 1 (since the first sealing lip 52 and the second sealing lip 53 have a certain elasticity, the sealing lip at the gap between the two pressing blocks is deformed under force, so that the sealing performance of the sealing lip at the gap is not affected), and meanwhile the pressure of the pressing blocks on the first extrusion force as a whole pushes the lip of the second sealing lip 53 to tightly adhere to the mounting groove, and through the cooperation of the three sealing pairs, the sealing effect at the sealing position is further increased.

[0051] To cooperate with the application of pressure to the pressing blocks, the embodiment is also provided with a corresponding adjusting structure, which includes a cylinder 7 and a plurality of adjusting bolts 8. The diameter of the cylinder 7 is approximately equal to the diameter of the pressurizing part 54, so that one end of the cylinder 7 can completely contact the pressing blocks. The plurality of adjusting bolts 8 are arranged in a circular manner around the center of the shaft sleeve 1 on the end cover 6. One end of each adjusting bolt 8 abuts against the end of the cylinder 7 away from the pressurizing part 54. Through the adjustment of the tightness of the plurality of adjusting bolts 8, the radial tightness of the skeleton oil seal 5 can be adjusted correspondingly through the adjustment of the adjusting structure, so that the problems of oil seal leakage and dry friction caused by the over-tightness or over-looseness of the skeleton oil seal 5 after installation are avoided. Meanwhile, the adjusting structure can also adjust the position of the skeleton oil seal 5, so that the skeleton oil seal 5 is perpendicular to the axis of the shaft sleeve 1, and the lubricating oil on the skeleton oil seal 5 is prevented from being drained, which causes excessive wear of the sealing lip.

[0052] Embodiment 3

[0053] Please refer to Figure 5 Compared with embodiment 2, the difference of the embodiment is the different adjusting structure. The embodiment is further provided with a plurality of springs 9 on the basis of the adjusting structure in embodiment 2. Each spring 9 corresponds to each adjusting bolt 8, and is arranged between the adjusting bolt 8 and the end of the cylinder 7. The adjustment of the tightness of the adjusting bolt 8 can adjust the elastic force of the spring 9, and further adjust the radial tightness of the skeleton oil seal 5. Meanwhile, the design of the spring 9 can self-adaptively adjust the radial tightness of the skeleton oil seal 5, so that the adaptability and service life of the skeleton oil seal 5 are improved.

[0054] Embodiment 4

[0055] As Figure 6As shown, the embodiment also provides a Roots blower, which comprises a pump body 10 and a transmission shaft 11. The transmission shaft 11 is provided with a sealing device for sealing the gap between the pump body 10 and the transmission shaft 11 at the part passing through the pump body 10. The sealing device adopts the sealing device of any one of the blowers in Embodiments 1, 2 and 3.

[0056] The technical features of the above-described embodiments can be combined in any manner. For the sake of brevity, not all possible combinations of the technical features in the above-described embodiments are described, however, as long as the combinations of the technical features do not contradict each other, they should be considered as falling within the scope of the present disclosure.

[0057] The above-described embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the scope of the present application. It should be pointed out that, for those skilled in the art, some modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A sealing device for a fan, characterized in that, It includes: A bushing (1) has a sealing ring (2) on its inner wall; A bearing seat (3) is fitted onto the outer wall of the bushing (1); the inner wall of the bearing seat (3) is provided with an installation groove; At least two piston rings (4) are installed between the bushing (1) and the bearing seat (3); at least two of the piston rings (4) are located at one end of the bearing seat (3) as a first sealing position; A skeleton oil seal (5) is installed in the mounting groove and is fitted onto the outer wall of the bushing (1) as a second sealing position; and End cap (6) is fitted on the outer wall of bushing (1); the end cap (6) is also connected to the other end of bearing seat (3).

2. The sealing device for a fan according to claim 1, characterized in that, The skeleton oil seal (5) includes: The bracket part (51) forms a first sealing pair with the bottom surface of the mounting groove; a first extrusion surface is provided on the bracket part (51); The first sealing lip (52) is connected at one end to the bracket part (51); the first sealing lip (52) is provided with a second extrusion surface; there is an acute angle between the first extrusion surface and the second extrusion surface; the first sealing lip (52) and the outer wall of the bushing (1) form a second sealing pair; The second sealing lip (53) has one end connected to the bracket portion (51); the second sealing lip (53) and the side wall of the mounting groove form a third sealing pair; and The pressurizing part (54) is generally annular; the pressurizing part (54) includes two arc-shaped pressing blocks; both pressing blocks are located between the first extrusion surface and the second extrusion surface, and are in contact with the first extrusion surface and the second extrusion surface.

3. The sealing device for a fan according to claim 2, characterized in that, The sealing device of the fan also includes an adjustment structure for applying pressure to the pressure block; The adjustment structure includes: The cylinder (7), one end of which abuts against the pressure block; and Multiple adjusting bolts (8) are arranged in a ring around the center of the bushing (1) on the end cover (6); one end of each adjusting bolt (8) abuts against the end of the cylinder (7) away from the pressure part (54).

4. The sealing device for the fan according to claim 3, characterized in that, The adjustment structure also includes multiple springs (9); Multiple springs (9) are installed one-to-one between the adjusting bolt (8) and the end of the cylinder (7).

5. The sealing device for a fan according to claim 2, characterized in that, The mounting groove extends to one end of the bearing seat (3) to form a side groove; the side of the mounting groove away from the bushing (1) is the bottom surface of the groove; The end cap (6) is used to close the side opening of the mounting groove.

6. The sealing device for a fan according to claim 2, characterized in that, The support portion (51) includes an annular metal frame and a rubber layer that wraps around the metal frame. The rubber layer abuts against the bottom surface of the mounting groove.

7. The sealing device for a fan according to claim 2, characterized in that, The support portion (51) includes: The contact portion that contacts the mounting groove; and The constricted portion has one end connected to the contact portion; the first extrusion surface is located on the inner wall of the constricted portion. The first sealing lip (52) and the second sealing lip (53) are both connected to the other end of the constricted portion; The side of the first sealing lip (52) away from the bushing (1) is the second extrusion surface.

8. The sealing device for a fan according to claim 2, characterized in that, The gap between the two end faces of the pressure block is set to 1-2 mm.

9. The sealing device for a fan according to claim 1, characterized in that, Two sealing rings (2) are provided, and they are located at both ends of the bushing (1).

10. A Roots blower, comprising a pump body (10) and a drive shaft (11), wherein a sealing device is provided at the portion of the drive shaft (11) passing through the pump body (10) for sealing the gap between the pump body (10) and the drive shaft (11); Its features are, The sealing device is the sealing device of the fan as described in any one of claims 1 to 9.

Images