Packing sealing structure of vacuum pump

Abstract

The utility model relates to the technical field of vacuum pumps, in particular to a packing sealing structure of a vacuum pump, which comprises a vacuum pump main body, a packing box and a gland, the packing box is welded on one side of the vacuum pump main body, the gland is detachably connected with the packing box, and the sealing structure comprises a sealing element arranged between the gland and the packing box. The sealing piece is of an annular structure, the two sides of the outer wall of the sealing piece are fixedly connected with protruding edges with the semicircular sections, protruding edge-groove mechanical sealing between the gland and the stuffing box is combined with elastic compensation of the extending piece, the conical sealing face pressurization design is matched, multiple dynamic sealing interfaces are formed, interface gap leakage of a traditional single-gasket structure is effectively eliminated, and the sealing effect is good. The leakage rate is reduced; symmetrical positioning rods and an expansion plate of the limiting mechanism restrain the force application direction of a locking nut, the sealing effect between a gland and a stuffing box is further improved, a limiting cover and a quick-release nut are designed to achieve quick replacement of a sealing piece or stuffing without disassembling the main shaft, and the maintenance efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a vacuum pump technical field, specifically discloses a kind of packing seal structure of vacuum pump. BACKGROUND

[0002] The packing seal structure of vacuum pump is the key component for preventing medium from leaking along pump shaft, and its core principle is to make the packing tightly adhere to the inner wall of shaft sleeve and packing box by applying axial pressure through gland. In the prior art, the assembly of packing box and gland is usually achieved by using annular gland in cooperation with multiple circumferentially distributed fastening nuts to realize fixation, and a single sealing gasket is arranged between the end surface of gland and packing box. However, this structure has significant defects in practical application:

[0003] The conventional structure only arranges a single layer of flat gasket (such as rubber or asbestos material) on the contact surface of gland and packing box. When the pump body vibrates or the temperature changes cause the deformation of box, the gasket is prone to creep or local disconnection, resulting in micro-gap at the sealing interface and becoming the preferred path for medium leakage, thereby causing leakage risk. SUMMARY

[0004] The utility model discloses a kind of packing seal structure of vacuum pump, and through the convex rib-groove mechanical seal between gland and packing box and the combination of extension piece elastic compensation, cooperate with the design of tapered sealing surface pressurization, form multiple dynamic sealing interface, effectively eliminate the interface gap leakage of conventional single gasket structure, reduce leakage rate.

[0005] The utility model is realized as follows: a kind of packing seal structure of vacuum pump, comprising: vacuum pump main body, packing box and gland, the packing box is welded on the side of vacuum pump main body, the gland and packing box are detachably connected;

[0006] Sealing mechanism, the sealing mechanism includes the sealing element being arranged between the gland and the packing box, the sealing element is annular structure and the outer wall both sides are fixedly connected with the convex rib of the section being semicircular, the side of the gland and the packing box is all set with the annular groove being matched with the convex rib, the periphery of the sealing element is provided with the extension piece extending outward;

[0007] Limiting mechanism, the limiting mechanism includes two arc-shaped limiting covers, two the limiting cover is buckled on the outer wall of the connecting place of the gland and the packing box, and two The limiting cover is symmetrically arranged, the outer wall of the limiting cover is fixedly connected with two expansion plates, the outer wall of the gland and the packing box is fixedly connected with two symmetrically distributed positioning rods, two positioning rods located on the same side are respectively penetrated through two expansion plates and the outer wall is all screw-threaded with lock nut.

[0008] As a kind of packing seal structure of the utility model vacuum pump preferably, the sealing mechanism further includes conical sealing surface fixedly connected to the inner side of gland, the inner side of packing box is fixedly connected with conical sealing ring matched with conical sealing surface.

[0009] As a kind of packing seal structure of the utility model vacuum pump preferably, the sealing mechanism further includes bottom bushing, packing and seal liquid ring, bottom bushing, packing and seal liquid ring are all arranged in the inner cavity of packing box.

[0010] As a kind of packing seal structure of the utility model vacuum pump preferably, the inner cavity of vacuum pump main body is provided with main shaft, the left side of main shaft is connected with pump blade of vacuum pump main body, the right side of main shaft penetrates the right side of vacuum pump main body, bottom bushing, packing and seal liquid ring are all sleeved on the outer side wall of main shaft.

[0011] As a kind of packing seal structure of the utility model vacuum pump preferably, the contact surface section of packing box and gland is trapezoidal structure, the inner side section of limiting cover is matched with the trapezoidal structure.

[0012] As a kind of packing seal structure of the utility model vacuum pump preferably, the sealing piece and conical sealing ring are all high-temperature-resistant fluorine rubber material.

[0013] The utility model has the advantages of:

[0014] The utility model discloses a kind of packing seal structure of vacuum pump, including vacuum pump main body, the sealing mechanism of packing box and gland, limiting mechanism, quick-release nut, sealing piece and conical sealing ring, the sealing mechanism is fixedly connected to the inner side of packing box, and the sealing mechanism includes limiting cover, sealing piece and conical sealing ring, limiting cover is fixedly connected to the inner side of packing box, and sealing piece and conical sealing ring are all arranged in the inner cavity of packing box. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the specific embodiment of the utility model or the technical scheme in prior art, the drawings needed to be used in the specific embodiment or prior art description will be simply introduced as follows. In all drawings, similar elements or parts are generally identified by similar reference signs. In the drawings, each element or part is not necessarily drawn according to actual proportion.

[0016] Fig. 1 It is the overall sectional view structure of the utility model;

[0017] Fig. 2 It is the enlarged structure diagram of a of the utility model;

[0018] Fig. 3This is a side view of the sealing component of this utility model.

[0019] The markings in the diagram are: 1. Vacuum pump body; 2. Stuffing box; 3. Gland; 4. Seal; 5. Rib; 6. Extension plate; 7. Limit cover; 8. Expansion plate; 9. Positioning rod; 10. Locking nut; 11. Conical sealing surface; 12. Conical sealing ring; 13. Bottom bushing; 14. Packing; 15. Sealing ring; 16. Main shaft. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and specific embodiments to aid in understanding its content. Unless otherwise specified, the methods used in this invention are conventional methods; the raw materials and apparatus used, unless otherwise specified, are conventional commercially available products.

[0021] Please see Figs. 1-3 A packing seal structure for a vacuum pump includes: a vacuum pump body 1, a packing box 2, and a gland 3. The packing box 2 is welded to one side of the vacuum pump body 1, and the gland 3 and the packing box 2 are detachably connected.

[0022] The sealing mechanism includes a sealing element 4 disposed between the gland 3 and the stuffing box 2. The sealing element 4 has an annular structure and a semi-circular convex rib 5 is fixedly connected to both sides of its outer wall. An annular groove matching the convex rib 5 is opened on the opposite side of the gland 3 and the stuffing box 2. An outwardly extending extension piece 6 is provided around the periphery of the sealing element 4.

[0023] The limiting mechanism includes two arc-shaped limiting covers 7, which are fastened to the outer wall of the connection between the pressure cover 3 and the stuffing box 2. The two limiting covers 7 are symmetrically arranged. Two expansion plates 8 are fixedly connected to the outer wall of the limiting cover 7. Two symmetrically distributed positioning rods 9 are fixedly connected to the outer walls of both the pressure cover 3 and the stuffing box 2. The two positioning rods 9 located on the same side pass through the two expansion plates 8 respectively, and the outer walls of both are threaded with locking nuts 10.

[0024] In this embodiment: the semi-circular protrusions 5 on both sides of the seal 4 are embedded in the annular grooves of the gland 3 and the stuffing box 2, forming the first mechanical seal. The extension piece 6 around the seal extends outward when the gland is tightened, filling the interface gap and forming the second dynamic seal. The two arc-shaped limiting covers 7 are fastened at the connection between the gland 3 and the stuffing box 2. The trapezoidal contact surface between the stuffing box 2 and the gland 3 matches the inner side of the limiting cover 7. Through the cooperation of the expansion plate 8 and the positioning rod 9, when the locking nut 10 is rotated, the limiting cover 7 is driven to gradually move towards the gland 3. The cover 3 moves to one side of the stuffing box 2, thereby pressing and fixing the extension piece 6 to further improve the sealing effect. The conical sealing surface 11 on the inner side of the cover 3 cooperates with the conical sealing ring 12 to generate radial expansion force when axially pressed, which enhances the sealing effect at the connection between the cover 3 and the stuffing box 2. The bottom bushing 13, packing 14, and sealing ring 15 are sequentially fitted onto the outside of the main shaft 16. The axial pressing force of the cover 3 achieves radial sealing of the main shaft 16 by the packing 14. The sealing ring 15 can introduce lubricating or cooling medium to reduce frictional heat.

[0025] As a technical optimization of this utility model, the sealing mechanism also includes a conical sealing surface 11 fixedly connected to the inner side of the pressure cover 3, and a conical sealing ring 12 matching the conical sealing surface 11 is fixedly connected to the inner side of the stuffing box 2.

[0026] In this embodiment, the conical sealing surface 11 on the inner side of the gland 3 cooperates with the conical sealing ring 12 to generate radial expansion force when axially pressed, thereby enhancing the sealing effect at the connection between the gland 3 and the stuffing box 2.

[0027] As a technical optimization of this utility model, the sealing mechanism also includes a bottom bushing 13, a packing 14, and a sealing ring 15, all of which are disposed in the inner cavity of the packing box 2.

[0028] In this embodiment: the bottom bushing 13, the packing 14 and the sealing ring 15 are all disposed in the inner cavity of the packing box 2. The sealing ring 15 can introduce lubricating or cooling media to reduce frictional heat.

[0029] As a technical optimization of this utility model, the inner cavity of the vacuum pump body 1 is provided with a main shaft 16. The left side of the main shaft 16 is connected to the pump blade of the vacuum pump body 1, and the right side of the main shaft 16 penetrates through the right side of the vacuum pump body 1. The bottom bushing 13, the packing 14 and the sealing ring 15 are all sleeved on the outer side wall of the main shaft 16.

[0030] In this embodiment: the bottom bushing 13, the packing 14, and the sealing ring 15 are sequentially fitted onto the outside of the main shaft 16. The axial clamping force of the pressure cap 3 achieves radial sealing of the main shaft 16 by the packing 14. The sealing ring 15 can introduce lubricating or cooling media to reduce frictional heat.

[0031] As a technical optimization of this utility model, the contact surface cross-section of the stuffing box 2 and the gland 3 is trapezoidal, and the inner cross-section of the limiting cover 7 matches the trapezoidal structure.

[0032] In this embodiment, the contact surface of the stuffing box 2 and the gland 3 has a trapezoidal cross-section. The inner cross-section of the limiting cover 7 matches the trapezoidal structure. When the locking nut 10 is rotated, the limiting cover 7 is driven to gradually move towards the side of the gland 3 and the stuffing box 2, thereby pressing and fixing the extension piece 6, and further improving the sealing effect.

[0033] As a technical optimization of this utility model, both the sealing element 4 and the conical sealing ring 12 are made of high-temperature resistant fluororubber.

[0034] In this embodiment, both the seal 4 and the conical sealing ring 12 are made of high-temperature resistant fluororubber, which has good high-temperature resistance, is not easy to age, and has a long service life.

[0035] The working principle and usage process of this utility model are as follows: The semi-circular protrusions 5 on both sides of the sealing element 4 are embedded in the annular grooves of the gland 3 and the stuffing box 2, forming the first mechanical seal. The extension piece 6 around the periphery of the sealing element extends outward when the gland is tightened, filling the interface gap and forming the second dynamic seal. The two arc-shaped limiting covers 7 are fastened at the connection between the gland 3 and the stuffing box 2. The trapezoidal contact surface between the stuffing box 2 and the gland 3 matches the inner side of the limiting cover 7. Through the cooperation of the expansion plate 8 and the positioning rod 9, when the locking nut 10 is rotated, the limiting cover 7 is driven. The extension piece 6 is gradually moved to one side of the gland 3 and the stuffing box 2, thereby pressing and fixing it to further improve the sealing effect. The conical sealing surface 11 on the inner side of the gland 3 cooperates with the conical sealing ring 12 to generate radial expansion force when axially pressed, which enhances the sealing effect at the connection between the gland 3 and the stuffing box 2. The bottom bushing 13, packing 14, and sealing ring 15 are sequentially fitted onto the outside of the main shaft 16. The radial sealing of the main shaft 16 by the packing 14 is achieved by the axial pressing force of the gland 3. The sealing ring 15 can introduce lubricating or cooling medium to reduce frictional heat.

[0036] In the description of this utility model, it should be understood that the terms "left", "right", "up", "down", "top", "bottom", "front", "back", "inner", "outer", "back", "middle", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0037] However, the above description is only a specific embodiment of this utility model and should not be construed as limiting the scope of implementation of this utility model. Therefore, any substitution of equivalent components or equivalent changes and modifications made in accordance with the scope of protection of this utility model should still fall within the scope of the claims of this utility model.

Claims

1. A packing seal structure for a vacuum pump, characterized in that: include: The vacuum pump body (1), stuffing box (2) and gland (3) are provided. The stuffing box (2) is welded to one side of the vacuum pump body (1). The gland (3) and stuffing box (2) are detachably connected. The sealing mechanism includes a sealing element (4) disposed between the gland (3) and the stuffing box (2). The sealing element (4) has an annular structure and a semi-circular convex rib (5) is fixedly connected to both sides of the outer wall. An annular groove matching the convex rib (5) is opened on the opposite side of the gland (3) and the stuffing box (2). An outwardly extending extension piece (6) is provided on the periphery of the sealing element (4). The limiting mechanism includes two arc-shaped limiting covers (7). The two limiting covers (7) are fastened to the outer wall of the connection between the pressure cover (3) and the stuffing box (2). The two limiting covers (7) are symmetrically arranged. The outer wall of the limiting cover (7) is fixedly connected to two expansion plates (8). The outer walls of the pressure cover (3) and the stuffing box (2) are both fixedly connected to two symmetrically distributed positioning rods (9). The two positioning rods (9) located on the same side pass through the two expansion plates (8) respectively, and the outer walls of both are threaded with locking nuts (10).

2. The packing seal structure for a vacuum pump according to claim 1, characterized in that: The sealing mechanism also includes a conical sealing surface (11) fixedly connected to the inside of the gland (3), and a conical sealing ring (12) matching the conical sealing surface (11) is fixedly connected to the inside of the stuffing box (2).

3. The packing seal structure for a vacuum pump according to claim 1, characterized in that: The sealing mechanism also includes a bottom bushing (13), a packing (14), and a sealing ring (15), all of which are located in the inner cavity of the packing box (2).

4. The packing seal structure for a vacuum pump according to claim 3, characterized in that: The vacuum pump body (1) has a main shaft (16) in its inner cavity. The left side of the main shaft (16) is connected to the pump blade of the vacuum pump body (1), and the right side of the main shaft (16) penetrates the right side of the vacuum pump body (1). The bottom bushing (13), packing (14) and sealing ring (15) are all sleeved on the outer side wall of the main shaft (16).

5. The packing seal structure for a vacuum pump according to claim 1, characterized in that: The contact surface of the stuffing box (2) and the gland (3) has a trapezoidal cross-section, and the inner cross-section of the limiting cover (7) matches the trapezoidal structure.

6. The packing seal structure for a vacuum pump according to claim 2, characterized in that: Both the sealing element (4) and the conical sealing ring (12) are made of high-temperature resistant fluororubber.

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