CN112963347A

CN112963347A - Sealing assembly for vacuum pump

Info

Publication number: CN112963347A
Application number: CN202110142796.4A
Authority: CN
Inventors: 赵彬彬; 臧邦海
Original assignee: Shandong Kaine Vacuum Technology Co ltd
Current assignee: Shandong Kaine Vacuum Technology Co ltd
Priority date: 2021-02-02
Filing date: 2021-02-02
Publication date: 2021-06-15
Anticipated expiration: 2041-02-02
Also published as: CN112963347B

Abstract

The invention discloses a sealing assembly for a vacuum pump, wherein the vacuum pump comprises a shell, a rotating shaft penetrating through the shell and a plurality of bearings connected to the rotating shaft, wherein a containing cavity for containing lubricating oil is formed in the shell, the rotating shaft extends into the containing cavity, the lubricating oil can flow along the rotating shaft, the sealing assembly is arranged at the joint of the bearings and the rotating shaft, and the sealing assembly can move towards the joint of the bearings and the rotating shaft so as to seal the joint of the bearings and the rotating shaft; the pivot can influence seal assembly's sealed effect when rotating, causes sealed inefficacy, leads to lubricating oil to continue to flow along the pivot to locate such as bearing, influence the normal work of vacuum pump, through seal assembly's removal, can ensure that seal assembly keeps the state of inseparable sealing to sealed department all the time, can not receive pivot pivoted influence, and is sealed effectual.

Description

Sealing assembly for vacuum pump

Technical Field

The invention belongs to the field of screw vacuum pumps, and particularly relates to a sealing assembly for a vacuum pump.

Background

The screw vacuum pump is an air pumping device which utilizes a pair of screws to synchronously rotate in opposite directions at a high speed in a pump shell to generate air suction and exhaust functions, is a renewal product of an oil seal type vacuum pump, can pump out gas occasions containing a large amount of water vapor and a small amount of dust, and is widely applied to the fields of enterprises which have higher requirements on clean vacuum, such as domestic pharmacy, chemical industry, semiconductors and the like. In the operation process of the screw vacuum pump, in order to ensure the rapid operation of the screw vacuum pump, lubricating oil needs to be properly added, the service efficiency and the service life of the screw vacuum pump are improved, but in the operation process of the screw vacuum pump, the lubricating oil can flow along with the rotation of the screw rod, other losses of parts which do not need to be lubricated in the screw vacuum pump are caused, and the normal operation of the screw vacuum pump is further influenced.

Disclosure of Invention

In view of the above disadvantages, the present invention provides a seal assembly for a vacuum pump, which can improve the sealing effect on lubricating oil.

The invention is realized by the following technical scheme:

a vacuum pump comprises a shell, a rotating shaft penetrating through the shell and a plurality of bearings connected to the rotating shaft, wherein a containing cavity containing lubricating oil is formed in the shell, the rotating shaft extends into the containing cavity, the lubricating oil can flow along the rotating shaft, the sealing assembly is arranged at the joint of the bearings and the rotating shaft, and the sealing assembly can move towards the joint of the bearings and the rotating shaft so as to seal the joint of the bearings and the rotating shaft; the pivot can influence seal assembly's sealed effect when rotating, causes sealed inefficacy, leads to lubricating oil to continue to flow along the pivot to locate such as bearing, influence the normal work of vacuum pump, through seal assembly's removal, can ensure that seal assembly keeps the state of inseparable sealing to sealed department all the time, can not receive pivot pivoted influence, and is sealed effectual.

As foretell preferred embodiment, the pivot is including stretching into the spindle nose that holds the chamber and the axle body of being connected with the spindle nose, and spindle nose and axle body junction form the ladder, and bearing and seal assembly all set up in ladder department, and the pivot is when rotating, and lubricating oil can flow along the spindle nose, and seal assembly prevents that lubricating oil from flowing to axle body department.

Further, the sealing assembly comprises a sealing piece, and a magnetic piece and a magnet which are arranged on two sides of the sealing piece, and the magnetic piece and the magnet are attracted to enable the sealing piece to move; the magnetic part is an object with magnetism, such as metal, the magnet is an object capable of generating a magnetic field, such as a magnet, and the like, the magnetic part and the magnet attract each other to drive the sealing part in the middle to move, and meanwhile, the magnet can generate attraction force on the magnetic part under the condition that the magnet is not in contact with the magnetic part, so that the sealing part is conveniently driven to move.

In the preferred embodiment, the magnet is a permanent magnet, and is stable in use.

Further, the magnet is fixed in the casing, and the magnet attracts the magnetic part to drive the sealing member to move. Through fixing the magnet, make the sealing member move towards magnet department under the drive of magnetic part, and then realize sealed.

Further, the sealing member includes the first sealing member of butt with the magnetic part and the second sealing member of butt with first sealing member, and the magnetic part drives first sealing member and removes towards the second sealing member, and first sealing member is the oil blanket with the second sealing member junction. The oil blanket can reduce the frictional force between first sealing member and the second sealing member, avoid between first sealing member and the second sealing member because relative motion produces the temperature rise that frictional force leads to, improve first sealing member and second sealing member life, simultaneously, the oil blanket can form for lubricating oil, can realize effective utilization to lubricating oil, when reducing contact segment frictional force, the oil blanket also plays sealed effect jointly with first sealing member and second sealing member, sealed effect is better.

As the preferred embodiment, the magnet and the second sealing element are overlapped in the vertical direction, after the magnet is fixed, the magnetic element can drive the first sealing element to move towards the second sealing element, the joint of the first sealing element and the second sealing element is tightly attached, and the sealing effect is better.

Furthermore, the included angle between the sealing direction of the first sealing element and the sealing direction of the second sealing element is 85-95 degrees. If the included angle between the sealing direction of the first sealing element and the sealing direction of the second sealing element is too large or too small, the first sealing element and the second sealing element are overlapped too much, sealing in multiple directions cannot be achieved, the sealing effect is poor, preferably, the sealing direction of the first sealing element is the vertical direction, the sealing direction of the second sealing element is the horizontal direction, the sealing direction of the first sealing element is perpendicular to the sealing direction of the second sealing element, and simultaneous sealing in the horizontal direction and the vertical direction is achieved.

Further, seal assembly includes the sealing member and sets up in the sealing ring of bearing and pivot junction, and sealing member and pivot are located the sealing ring both sides respectively, are provided with first sealing washer between sealing ring and the sealing member. The sealing ring realizes first sealing, and the sealing member then seals the sealing ring once more, realizes that the second is sealed, and sealed effect is better, and simultaneously, first sealing washer sets up between sealing ring and sealing member, plays supplementary sealed effect between sealing ring and the sealing member.

Further, the sealing ring is sunken to form a mounting groove for accommodating a second sealing ring, and the second sealing ring is abutted to the rotating shaft. Lubricating oil can flow along the pivot, can prevent through setting up the second sealing washer that lubricating oil from flowing along the pivot surface, reduces the lubricating oil that gets into bearing and pivot junction.

Furthermore, the sealing assembly comprises a rotating part rotating along with the rotating shaft and a fixing part fixed in the shell, and a third sealing ring is arranged at the joint of the fixing part and the shell. The rotation piece can rotate with the pivot is synchronous, when avoiding the pivot to rotate and produce the clearance between the piece, rotate the piece and carried out a seal to bearing and pivot junction, reduced lubricating oil and got into the mounting and rotated between the quantity, the mounting cooperatees with rotating the piece, in the mounting was fixed in the casing, sealed more stable.

Further, the fixing piece is detachably connected with the shell. The fixing piece is convenient to replace after being abraded.

As the preferred embodiment, the fixed part is the carbocycle, and the carbocycle is convenient to change after wearing, guarantees the tightness of sealed between fixed part and the rotating member.

Further, a communication channel for communicating the rotating shaft with the bearing is formed in the shell, and the sealing assembly is arranged in the communication channel.

Drawings

FIG. 1 is a schematic view illustrating the construction of an exemplary embodiment of a vacuum pump according to the present invention;

FIG. 2 is a schematic enlarged view of a portion A of FIG. 1 according to the present invention.

Reference numerals:

1. a shell body, 11, an accommodating cavity, 12, a communicating channel, 2, a rotating shaft, 21, a shaft head, 22 and a shaft body,

3. bearing, 4, seal assembly, 41, seal, 411, first seal, 412, second seal,

42. a magnetic member 43, a magnet 44, a seal ring 45, a first seal ring 46, a second seal ring 47, a first seal ring, a second seal ring, a third seal ring, a fourth seal ring, a fifth seal ring, a sixth seal ring,

third sealing washer, 5, apron, 6, housing screw.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that the terms of orientation such as left, right, up, down, front and back in the embodiments of the present invention are only relative concepts or are referred to a normal use state of the product, i.e., a traveling direction of the product, and should not be considered as limiting.

In addition, the dynamic terms such as "relative movement" mentioned in the embodiments of the present invention include not only a positional change but also a movement in which a state changes without a relative change in position such as rotation or rolling.

Finally, it is noted that when an element is referred to as being "on" or "disposed" to another element, it can be on the other element or intervening elements may also be present. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may also be present.

As shown in fig. 1 and 2, the vacuum pump includes a housing 1, a rotating shaft 2 penetrating through the housing 1, and a plurality of bearings 3 connected to the rotating shaft 2, the housing 1 is formed with a containing cavity 11 for containing lubricating oil, the rotating shaft 2 extends into the containing cavity 11 and the lubricating oil can flow along the rotating shaft 2, a sealing assembly 4 is disposed at a joint of the bearings 3 and the rotating shaft 2, and the sealing assembly 4 can move towards the joint of the bearings 3 and the rotating shaft 2 to seal the joint of the bearings 3 and the rotating shaft 2; the sealed effect of pivot 2 can influence seal assembly 4 when rotating, causes sealed inefficacy, leads to lubricating oil to continue to flow along pivot 2 to locate to bearings 3 etc. influences the normal work of vacuum pump, through seal assembly 4's removal, can ensure that seal assembly 4 keeps the state of inseparable sealing to sealed department all the time, can not receive 2 pivoted influences of pivot, and is sealed effectual.

Preferably, pivot 2 is including stretching into the spindle nose 21 that holds chamber 11 and the axle body 22 of being connected with spindle nose 21, and spindle nose 21 forms the ladder with axle body 22 junction, and bearing 3 and seal assembly 4 all set up in ladder department, and pivot 2 is when rotating, and lubricating oil can flow along spindle nose 21, and seal assembly 4 prevents that the lubricating oil from flowing to axle body 22 department.

The vacuum pump still includes apron 5, and apron 5 is connected to casing 1 through several housing screw 6, holds the chamber 11 and encloses for casing 1 and apron 5 jointly, and is preferred, and apron 5 is provided with the sealing washer with casing 1 junction equally, realizes the sealed of lubricating oil.

A communicating channel 12 for communicating the rotating shaft 2 and the bearing 3 is formed in the shell 1, and the sealing assembly 4 is arranged in the communicating channel 12; specifically, intercommunication passageway 12 encloses for spindle nose 21, axle body 22 and casing 1, through setting up seal assembly 4 in intercommunication passageway 12, can prevent along the lubricating oil entering intercommunication passageway 12 that spindle nose 21 flows in, and then avoid lubricating oil flow direction axle body 22 department.

It is preferred. The number of the sealing assemblies 4 is two, the two sealing assemblies 4 are arranged on the upper side and the lower side of the shaft head 21 relatively, and the rotating shaft 2 is in a rotating state during working, so that the sealing effect of the two sealing assemblies 4 is better, and the number of the bearings 3 is even and the bearings are equally distributed on the upper side and the lower side of the shaft head 21.

The sealing assembly 4 comprises a rotating part rotating along with the rotating shaft 2 and a fixed part fixed in the shell 1, and a third sealing ring 47 is arranged at the joint of the fixed part and the shell 1; rotate the piece and can rotate with pivot 2 synchronization, when avoiding pivot 2 to rotate and produce the clearance between the piece, rotate the piece and carried out a seal to bearing 3 and 2 junctions of pivot, reduced lubricating oil and got into the mounting and rotated the quantity between the piece, the mounting cooperates with rotating the piece, the mounting is fixed in casing 1 in, it is sealed more stable.

The fixing member is detachably connected with the housing 1. The fixing piece is convenient to replace after being abraded.

Preferably, the mounting is the carbocycle, and the carbocycle is the quick-wear part, conveniently changes when the carbocycle wearing and tearing rear, ensures the mounting and rotates the inseparable of sealing between the piece, also can play the protection to rotating the piece simultaneously, only need change the mounting can.

As the carbon ring is a wearing part, the carbon ring is subjected to wear-resisting treatment in order to prolong the service life of the carbon ring and reduce the replacement frequency of the carbon ring.

The sealing assembly 4 comprises a sealing member 41, and a magnetic member 42 and a magnet 43 which are arranged on two sides of the sealing member 41, wherein the magnetic member 42 and the magnet 43 attract to make the sealing member 41 move; the magnetic member 42 is a magnetic object, such as a metal, and the magnet 43 is an object capable of generating a magnetic field, such as a magnet, and the magnetic member 42 and the magnet 43 attract each other to drive the sealing member 41 located therebetween to move, and meanwhile, the magnet 43 can generate attraction force to the magnetic member 42 without contacting the magnetic member 42, so as to drive the sealing member 41 to move.

Preferably, the magnet 43 is a permanent magnet, which is stable in use.

The magnet 43 is fixed in the housing 1, and the magnet 43 attracts the magnetic member 42 to move the sealing member 41. The sealing is achieved by fixing the magnet 43 so that the sealing member 41 moves toward the magnet 43 under the driving of the magnetic member 42.

The magnetic member 42 includes a first magnetic member 42, a second magnetic member 42 and a third magnetic member 42 connected in sequence, wherein the first magnetic member 42 and the third magnetic member 42 both extend in a vertical direction, the second magnetic member 42 extends in a horizontal direction, the first magnetic member 42 and the second magnetic member 42 form an L-shaped structure, the second magnetic member 42 and the third magnetic member 42 also form an L-shaped structure, the magnet 43 attracts the third magnetic member 42 to drive the magnetic member 42 to integrally move, the first magnetic member 42 and the second magnetic member 42 form an L-shaped structure, the first sealing member 411 is connected to an included angle formed by the first magnetic member 42 and the second magnetic member 42, and the first sealing member 411 is driven to move towards the second sealing member 412.

The sealing member 41 includes a first sealing member 411 abutting against the magnetic member 42 and a second sealing member 412 abutting against the first sealing member 411, the magnetic member 42 drives the first sealing member 411 to move towards the second sealing member 412, and a joint between the first sealing member 411 and the second sealing member 412 is an oil cover. The oil cover can reduce the friction between the first sealing element 411 and the second sealing element 412, avoid the temperature rise between the first sealing element 411 and the second sealing element 412 caused by the friction generated by relative movement, and improve the service life of the first sealing element 411 and the second sealing element 412.

When the vacuum pump is in operation, the first sealing element 411 and the magnetic element 42 rotate together with the rotating shaft 2, that is, the first sealing element 411 and the magnetic element 42 form a rotating element, the second sealing element 412 is fixed in the housing 1, and the second sealing element 412 is a fixed element.

The contact surface between the first sealing element 411 and the second sealing element 412 is manufactured through grinding, the surface finish is high, and the contact surface is an oil cover, so that the friction coefficient between the first sealing element 411 and the second sealing element 412 is further reduced, the friction heat generation between the first sealing element 411 and the second sealing element 412 is negligible, and the abrasion consumption of the second sealing element 412 can be reduced.

Preferably, the magnet 43 and the second sealing element 412 are overlapped in the vertical direction, and after the magnet 43 is fixed, the magnetic element 42 drives the first sealing element 411 to move towards the second sealing element 412, and the joint of the first sealing element 411 and the second sealing element 412 is tightly attached, so that the sealing effect is better.

When the number of the seal assemblies 4 is two, and accordingly, the number of the magnets 43 is also two, the magnet 43 is located below the second seal 412 in the seal assembly 4 located below the rotating shaft 2, and the magnet 43 is located above the second seal 412 in the seal assembly 4 located above the rotating shaft 2.

The angle between the sealing direction of the first sealing element 411 and the sealing direction of the second sealing element 412 is 85-95 deg. If the included angle between the sealing direction of the first sealing element 411 and the sealing direction of the second sealing element 412 is too large or too small, the first sealing element 411 and the second sealing element 412 are overlapped too much, sealing in multiple directions cannot be achieved, and the sealing effect is poor.

Of course, for the sealing assembly 4, other structures may be used to push the first sealing element 411 to move toward the second sealing element 412, for example, an elastic element is connected between the first sealing element 411 and the housing 1, the first sealing element 411 is located between the elastic element and the second sealing element 412, and the extending direction of the elastic element is parallel to the moving direction of the first sealing element 411, the elastic element is in a compressed state in a normal state, so that the elastic element will generate a reaction force on the first sealing element 411 to drive the first sealing element 411 to move toward the second sealing element 412 in order to restore its original state.

The sealing assembly 4 comprises a sealing element 41 and a sealing ring 44 arranged at the joint of the bearing 3 and the rotating shaft 2, the sealing element 41 and the rotating shaft 2 are respectively arranged at two sides of the sealing ring 44, and a first sealing ring 45 is arranged between the sealing ring 44 and the sealing element 41. Sealing ring 44 realizes that first is sealed, and sealing member 41 then seals sealing ring 44 once more, realizes that the second is sealed, and sealed effect is better, and simultaneously, first sealing washer 45 sets up between sealing ring 44 and sealing member 41, plays supplementary sealed effect between sealing ring 44 and the sealing member 41.

The seal ring 44 is recessed to form a mounting groove for receiving a second seal ring 46, the second seal ring 46 abutting the shaft 2. Lubricating oil can flow along pivot 2, can prevent through setting up second sealing washer 46 that lubricating oil from flowing along pivot 2 surface, reduces the lubricating oil that gets into bearing 3 and pivot 2 junction.

The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. The utility model provides a seal assembly for vacuum pump, its characterized in that, vacuum pump include the casing, pass the pivot and the several of casing are connected to the bearing of pivot, the casing is formed with the chamber that holds lubricating oil, the pivot stretches into hold chamber and lubricating oil and can follow the pivot is flowed, seal assembly set up in the bearing with the pivot junction, seal assembly can move towards the bearing with the pivot junction removes, and is right the bearing with the pivot junction is sealed.

2. The seal assembly for a vacuum pump of claim 1, wherein the seal assembly comprises a seal member and a magnetic member and a magnet disposed on either side of the seal member, the magnetic member and the magnet being attracted to move the seal member.

3. The seal assembly of claim 2, wherein the magnet is fixed within the housing, the magnet attracting the magnetic member to move the sealing member.

4. The seal assembly for the vacuum pump according to claim 2, wherein the seal member comprises a first seal member abutting against the magnetic member and a second seal member abutting against the first seal member, the magnetic member drives the first seal member to move towards the second seal member, and a joint between the first seal member and the second seal member is an oil cover.

5. A seal assembly for a vacuum pump according to claim 4, wherein the angle between the sealing direction of the first seal and the sealing direction of the second seal is from 85 ° to 95 °.

6. The seal assembly for the vacuum pump according to claim 1, wherein the seal assembly comprises a sealing element and a sealing ring disposed at a connection position of the bearing and the rotating shaft, the sealing element and the rotating shaft are respectively located at two sides of the sealing ring, and a first sealing ring is disposed between the sealing ring and the sealing element.

7. A seal assembly for a vacuum pump according to claim 6, wherein the sealing ring is recessed to form a mounting groove for receiving a second sealing ring, the second sealing ring abutting the shaft.

8. The seal assembly for a vacuum pump according to claim 1, wherein the seal assembly comprises a rotating member rotating with the rotating shaft and a fixing member fixed in the housing, and a third seal ring is disposed at a connection between the fixing member and the housing.

9. The seal assembly for a vacuum pump of claim 8, wherein the fixture is removably connected to the housing.

10. The seal assembly for a vacuum pump according to claim 1, wherein a communication passage communicating the rotating shaft with the bearing is formed in the housing, and the seal assembly is disposed in the communication passage.