Sealing device of fan and Roots fan

Abstract

The invention relates to a sealing device of a fan and a Roots fan. The invention 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 end cover is further connected to the end, close to the framework oil seal, of the shaft seat. The piston ring forms the first sealing position, the framework oil seal forms the second sealing position to form the composite sealing structure, the sufficient sealing effect is guaranteed, and due to the structural characteristics of the piston ring and the framework oil seal, the risk that sealing liquid of an existing sealing device leaks is avoided; therefore, the service life of the sealing device is prolonged, and the overhaul and disassembly frequency is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of fan sealing devices, and in particular to a fan sealing device and a Roots blower. Background Art

[0002] Roots vacuum pump, also known as Roots blower, is widely used in chemical, pharmaceutical, food and other industries. Roots blower generally includes pump body, impeller, gear set and other components. The impeller is set in the pump body, and the drive shaft of the impeller passes through the pump body and is connected to the gear set, and then drives the impeller to rotate through the power source. Since the impeller needs to compress and transport gas in the pump body, the seal between the drive shaft of the impeller and the pump body is very important. The existing Roots blower generally uses a labyrinth seal 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 the Roots blower is relatively high, and the sealing effect of this sealing structure is poor. After a period of use, there is also the problem of leakage of the sealing liquid in the labyrinth. The pump body and supporting motor of the Roots blower are relatively large, and it is very difficult and time-consuming to disassemble the sealing device after a leak occurs. Summary of the invention

[0003] Based on this, it is necessary to provide a sealing device for a fan and a Roots blower to address the problem that the existing sealing device for a fan has a poor sealing effect and is prone to leakage.

[0004] In a first aspect, the present invention discloses: a sealing device for a fan, which includes 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 sleeve is provided on the outer wall of the shaft sleeve; the inner wall of the shaft seat is provided with a mounting groove. At least two piston rings are installed between the shaft sleeve and the shaft seat. At least two piston rings are located at one end of the shaft seat as a first sealing position. The skeleton oil seal is provided in the mounting groove, and the skeleton oil seal sleeve is provided on the shaft sleeve as a second sealing position. The end cover sleeve is provided 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 includes a bracket portion, a first sealing lip, a second sealing lip and a pressurizing portion.

[0007] The bracket part and the groove bottom surface of the installation groove form a first sealing pair; the bracket part is provided with a first extrusion surface.

[0008] One end of the first sealing lip is connected to the bracket portion. A second extrusion surface is arranged on the first sealing lip. An acute angle is formed 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 bracket portion. The second sealing lip and the side wall surface of the mounting groove form a third sealing pair.

[0010] The pressurizing part is annular in shape as a whole and includes two arc-shaped pressing blocks. The two pressing blocks are both located between the first pressing surface and the second pressing surface and are in contact with the first pressing surface and the second pressing surface.

[0011] As a preferred example, the sealing device of the fan further comprises an adjusting structure for applying pressure to the pressing block, wherein the adjusting structure comprises a cylinder and a plurality of adjusting bolts.

[0012] One end of the cylinder is against the pressing block. A plurality of adjusting bolts are arranged on the end cover in a circular shape with the center of the shaft sleeve. One end of each adjusting bolt is against an end of the cylinder away from the pressurizing part.

[0013] As a preferred example, the adjustment structure further includes a plurality of springs.

[0014] A plurality of springs are installed between the adjusting bolt and the end of the cylinder in a one-to-one correspondence.

[0015] As a preferred embodiment, 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 the groove bottom surface. The end cover is used to close the side notch of the mounting groove.

[0016] As a preferred example, the bracket portion includes an annular metal frame and a rubber layer wrapping the metal frame.

[0017] The rubber layer abuts against the bottom surface of the installation groove.

[0018] As a preferred example, the bracket portion includes a contact portion in contact with the mounting groove and a necked portion.

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

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

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

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

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

[0024] In a second aspect, the present invention further proposes a Roots blower, which includes a pump body and a transmission shaft, wherein a sealing device is provided at a portion where the transmission shaft passes through the pump body to seal the gap between the pump body and the transmission shaft. The sealing device is the sealing device of the blower in the first aspect.

[0025] The beneficial effects of the present invention are: 1. The present invention forms a composite sealing structure by forming a first sealing position through a piston ring and a second sealing position through a skeleton oil seal, thereby ensuring a sufficient sealing effect. In addition, due to the structural characteristics of the piston ring and the skeleton oil seal themselves, the risk of leakage of the sealing liquid of the existing sealing device is avoided, thereby increasing the service life of the sealing device and reducing the frequency of maintenance and disassembly.

[0026] 2. The present invention improves the skeleton oil seal. The improved skeleton oil seal forms a first sealing pair with the bottom surface of the mounting groove, a second sealing pair with the outer wall of the sleeve, and a third sealing pair with the side wall of the mounting groove. The cooperation of the three sealing pairs further increases the sealing effect at the sealing position.

[0027] 3. The present invention, through the arrangement of the skeleton oil seal and the adjustment structure, can ensure the sealing effect while making corresponding adjustments to the radial tightening force of the skeleton oil seal through the adjustment structure, thereby avoiding problems such as oil seal leakage and dry friction caused by over-tightening or over-loosening of the skeleton oil seal after installation. At the same time, the adjustment structure can also adjust the position of the skeleton oil seal to ensure that the skeleton oil seal is perpendicular to the axis of the shaft sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Figure 1 It is a structural schematic diagram of the sealing device of the fan in Example 1; Figure 2 is a schematic structural diagram of a sealing device for a fan in Example 2; Figure 3 for Figure 2 A magnified view of part A; Figure 4 This is a schematic diagram of the structure of the skeleton oil seal in Example 2; Figure 5 is a schematic diagram of the regulating structure in Example 3; Figure 6 This is a schematic diagram of the structure of the Roots blower in Example 4.

[0029] In the figure: sleeve 1, sealing ring 2, shaft seat 3, piston ring 4, skeleton oil seal 5, bracket 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

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] It should be noted that when a component is referred to as being "mounted on" another component, it may be directly on the other component or there may be a central component. When a component is considered to be "set on" another component, it may be directly set on the other component or there may be a central component at the same time. When a component is considered to be "fixed to" another component, it may be directly fixed on the other component or there may be a central component at the same time.

[0032] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "or / and" used herein includes any and all combinations of one or more of the related listed items.

[0034] Example 1 Please refer to Figure 1 This embodiment proposes a sealing device for a fan, which includes a sleeve 1, a shaft seat 3, at least two piston rings 4, a skeleton oil seal 5 and an end cover 6. Among them, the sleeve 1 and the transmission shaft 11 to be installed are transitionally matched. Sealing rings 2 are arranged on the inner wall of the sleeve 1 near both ends. Since the sleeve 1 and the transmission shaft 11 are relatively fixed, the two are sealed by the sealing rings 2 arranged at both ends of the sleeve 1. The sealing ring 2 can be made of fluororubber. In addition, two annular grooves are provided on the outer wall of one end of the sleeve 1. A matching piston ring 4 is sleeved in each annular groove.

[0035] 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 keyway can be opened on the outside of the shaft seat 3, and the shaft seat 3 is fixed by key connection. Finally, the shaft seat 3 and the pump body 10 are relatively fixed, and conventional sealing can be performed between the two. For example, the form of a sealing ring 2 can also be used. The installed shaft seat 3 is 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. At the same time, an installation groove is opened on the inner wall of the shaft seat 3. The notch of the installation groove extends to the end of the shaft seat 3 away from the piston ring 4, forming a side notch to facilitate the disassembly and assembly of the structure in the installation groove. The end cover 6 is sleeved on the outer wall of the shaft sleeve 1 and fixed to the shaft seat 3 by fixing bolts. At the same time, the end cover 6 seals the side notch of the installation groove, and the end cover 6 is set to the side away from the impeller, and the piston ring 4 is set to the side close to the impeller to reduce dust from entering the installation groove.

[0036] The skeleton oil seal 5 is installed in the installation groove. The skeleton oil seal 5 can adopt the 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, and the gas in the pump body 10 needs to pass through the first and second sealing positions in sequence to leak, thereby ensuring a sufficient sealing effect. Since the piston ring 4 is a rigid seal, and the structural characteristics of the skeleton oil seal 5 itself, the piston ring 4 and the skeleton oil seal 5 do not need to be filled with sealing liquid, such as sealing grease, etc. during installation, thereby avoiding the risk of leakage of the sealing liquid of the existing sealing device, and indirectly increasing the service life of the sealing device and reducing the frequency of inspection and disassembly. At the same time, the sealing device provided in this embodiment has a compact structure, and other components can be easily removed by simply opening the end cover 6 arranged outward, thereby reducing the difficulty of periodic repairs and maintenance.

[0037] Example 2 Compared with Example 1, this embodiment improves the skeleton oil seal 5. Figure 2 , Figure 3 and Figure 4 The skeleton oil seal 5 is annular in shape as a whole. The improved skeleton oil seal 5 comprises a bracket portion 51 , a first sealing lip 52 , a second sealing lip 53 and a pressurizing portion 54 .

[0038] For details, please refer again to Figure 3 (For ease of description, Figure 3), the bracket portion 51 includes a contact portion and a necking portion, forming a first sealing pair. The contact portion contacts the bottom surface of the mounting groove (the side of the mounting groove away from the sleeve 1 is the bottom surface) during installation. One end of the necking portion is connected to the contact portion, and the necking portion is necked toward the sleeve 1. The inner wall of the necking portion is set as a first extrusion surface. Furthermore, the entire bracket portion 51, that is, the contact portion and the necking portion are composed of a metal skeleton and a rubber layer including the metal skeleton. The two are connected by one-piece molding.

[0039] The first sealing lip 52 is connected to one end of the necked portion away from the contact portion. The cross-sectional shape of the first sealing lip 52 is not limited. It is necessary to ensure sufficient strength while making its lip portion contact the outer wall of the sleeve 1 to form a second sealing pair. At the same time, the first sealing lip 52 is away from its lip, that is, the side away from the sleeve 1 is set as a second extrusion surface. The second extrusion surface is parallel to the axial direction of the sleeve 1 or has an angle within 30°. It should be noted that an angle space is formed between the first extrusion surface and the second extrusion surface. The angle of the angle space is an acute angle, so that the contact portion and the lip of the first sealing lip are respectively located at the upper and lower ends of the skeleton oil seal.

[0040] The second sealing lip 53 is also connected to the end of the necking portion away from the contact portion, but its lip portion faces the left end and forms a third sealing pair with the side wall of the mounting groove. In addition, the first sealing lip 52 and the second sealing lip 53 are both made of rubber and can be integrally formed with the rubber layer of the bracket portion 51.

[0041] The pressurizing part 54 is annular in shape as a whole, but it is composed of two arc-shaped pressing blocks. The two pressing blocks can be put together to form an approximate circle, that is, a gap of 1-2mm is left between the end faces of the two to ensure that the two can be close to or far away from each other, and at the same time, they themselves have a certain toughness. The two pressing blocks are relatively circular and arranged in the angle space between the first extrusion surface and the second extrusion surface. By applying pressure to the pressing block from the outside, the pressing block generates pressure on the first extrusion surface, and the first extrusion surface converts the pressure of the pressing block into a first component force toward the first sealing pair and a second component force toward the second sealing pair. The first component force makes the bracket part 51 (the contact part therein) close to the installation groove. The second component force makes the lip of the first sealing lip 52 close to the shaft sleeve 1 (because the first sealing lip 52 and the second sealing lip 53 themselves have a certain elasticity, the sealing lip in the gap between the two pressing blocks is deformed and stressed accordingly, so as not to affect the sealing of the sealing lip in the gap), and at the same time, the pressure of the pressing block on the first extrusion force as a whole pushes the lip of the second sealing lip 53 close to the installation groove, and through the cooperation of the three sealing pairs, the sealing effect at the sealing position is further increased.

[0042] In order to cooperate with the pressure applied to the pressure block, the present embodiment is also equipped with a corresponding adjustment structure, which includes a cylinder 7 and a plurality of adjustment bolts 8. The diameter of the cylinder 7 is similar to the diameter of the pressure portion 54, so that one end of the cylinder 7 can be completely in contact with the pressure block. The plurality of adjustment bolts 8 are arranged on the end cover 6 in a ring shape with the center of the sleeve 1. One end of each adjustment bolt 8 is against the end of the cylinder 7 away from the pressure portion 54. Through the setting of the adjustment structure, the radial tightening force of the skeleton oil seal 5 can be adjusted accordingly by adjusting the tightness of the plurality of adjustment bolts 8, thereby avoiding the problems of oil seal leakage, dry friction, etc. caused by over-tightening or over-loosening of the skeleton oil seal 5 after installation. At the same time, the adjustment structure can also adjust the position of the skeleton oil seal 5 to ensure that the skeleton oil seal 5 is perpendicular to the axis of the sleeve 1, and prevent the lubricating oil on the skeleton oil seal 5 from being drained, resulting in excessive wear of the sealing lip.

[0043] Example 3 See also Figure 5 Compared with Example 2, the difference between this embodiment and Example 2 lies in the difference in the adjustment structure. In this embodiment, a plurality of springs 9 are further provided on the basis of the adjustment structure in Example 2. Each spring 9 corresponds to each adjustment bolt 8 one by one, and is provided between the adjustment bolt 8 and the end of the cylinder 7. The tightness adjustment of the adjustment bolt 8 can adjust the elastic force of the spring 9, and then adjust the radial tightening force of the skeleton oil seal 5. At the same time, the design of the spring 9 can adaptively adjust the radial tightening force of the skeleton oil seal 5 through the spring 9, thereby improving the adaptability and life of the skeleton oil seal 5.

[0044] Example 4 like Figure 6 As shown, this embodiment also provides a Roots blower, which includes a pump body 10 and a transmission shaft 11. A sealing device is provided at the part where the transmission shaft 11 passes through the pump body 10 to seal the gap between the pump body 10 and the transmission shaft 11. The sealing device adopts the sealing device of any one of the blowers in embodiments 1, 2, and 3.

[0045] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0046] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A sealing device for a fan, characterized in that: It includes: A shaft sleeve (1), the inner wall of which is provided with a sealing ring (2); A shaft seat (3) is sleeved on the outer wall of the shaft sleeve (1); a mounting groove is formed on the inner wall of the shaft seat (3); At least two piston rings (4) are installed between the shaft sleeve (1) and the shaft seat (3); at least two of the piston rings (4) are located at one end of the shaft seat (3) as a first sealing position; A skeleton oil seal (5) is arranged in the installation groove, and the skeleton oil seal (5) is sleeved on the outer wall of the shaft sleeve (1) as a second sealing position; and An end cover (6) is sleeved on the outer wall of the shaft sleeve (1); the end cover (6) is also connected to the other end of the shaft seat (3).

2. The sealing device for a fan according to claim 1, characterized in that: The skeleton oil seal (5) comprises: A bracket portion (51) which forms a first sealing pair with the bottom surface of the mounting groove; a first extrusion surface is provided on the bracket portion (51); A first sealing lip (52), one end of which is connected to the bracket portion (51); a second extrusion surface is provided on the first sealing lip (52); an acute angle is formed between the first extrusion surface and the second extrusion surface; the first sealing lip (52) and the outer wall of the shaft sleeve (1) form a second sealing pair; a second sealing lip (53), one end of which is connected to the bracket portion (51); the second sealing lip (53) and the side wall surface of the mounting groove form a third sealing pair; and The pressurizing portion (54) is annular in shape as a whole; the pressurizing portion (54) comprises two arc-shaped press blocks; the two press blocks are both 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 pressing block; The regulatory structure comprises: A cylinder (7), one end of which abuts against the pressing block; and A plurality of adjusting bolts (8) are arranged in a ring shape on the end cover (6) with the center of the shaft sleeve (1); one end of each adjusting bolt (8) abuts against an end of the cylinder (7) away from the pressurizing portion (54).

4. The sealing device for a fan according to claim 3, characterized in that: The adjustment structure also includes a plurality of springs (9); The plurality of springs (9) are installed in a one-to-one correspondence 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 installation groove extends to one end of the shaft seat (3) to form a side notch; the side of the installation groove away from the shaft sleeve (1) is the groove bottom surface; The end cover (6) is used to close the side notch of the installation groove.

6. The sealing device for a fan according to claim 2, characterized in that: The bracket portion (51) comprises an annular metal frame and a rubber layer wrapping the metal frame; The rubber layer abuts against the bottom surface of the installation groove.

7. The sealing device for a fan according to claim 2, characterized in that: The bracket portion (51) comprises: a contact portion that contacts the mounting groove; and A necking portion, one end of which is connected to the contact portion; the first extrusion surface is located on the inner wall of the necking portion; The first sealing lip (52) and the second sealing lip (53) are both connected to the other end of the necked portion; The side of the first sealing lip (52) away from the shaft sleeve (1) is a 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 pressing blocks 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 are respectively located at the two ends of the shaft sleeve (1).

10. A Roots blower, comprising a pump body (10) and a transmission shaft (11), wherein a sealing device is provided at a position where the transmission shaft (11) passes through the pump body (10) for sealing a gap between the pump body (10) and the transmission shaft (11); It is characterized in that The sealing device is a sealing device for a fan as described in any one of claims 1 to 9.

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