CN115822923A

CN115822923A - Vacuum pump shaft seal cooling body

Info

Publication number: CN115822923A
Application number: CN202211626123.7A
Authority: CN
Inventors: 吴晓云; 陆学贵
Original assignee: Zhejiang Boya Precision Machinery Co ltd
Current assignee: Zhejiang Boya Precision Machinery Co ltd
Priority date: 2022-12-15
Filing date: 2022-12-15
Publication date: 2023-03-21

Abstract

The invention discloses a vacuum pump shaft seal cooling mechanism, which comprises a shell and a rotating shaft, wherein an inner hole is formed in the shell, a bearing and a piston ring sealing element are arranged between the shell and the rotating shaft, the bearing and the piston ring sealing element are positioned in the inner hole and distributed along the axial direction, an oil storage cavity is formed in one side capable of corresponding to the bearing, an oil thrower is arranged in the oil storage cavity and is connected with the rotating shaft, an oil seal cavity is arranged between the bearing and the piston ring sealing element, an oil inlet channel communicated with the oil storage cavity and the oil seal cavity is formed in the top of the inner hole of the shell, and an oil return channel communicated with the oil storage cavity and the oil seal cavity is formed in the bottom of the inner hole of the shell.

Description

Vacuum pump shaft seal cooling body

Technical Field

The invention belongs to the technical field of vacuum pumps, and particularly relates to a vacuum pump shaft seal cooling mechanism.

Background

The vacuum pump refers to a device or equipment for obtaining vacuum by pumping a pumped container by using a mechanical, physical, chemical or physicochemical method. In general, a vacuum pump is a device for improving, generating and maintaining a vacuum in a certain closed space by various methods.

An oilless vacuum pump is a mechanical vacuum pump that can operate without any oil lubrication.

For example, chinese patent publication No. CN201925165U discloses a shaft seal structure for a vacuum pump, which includes a bearing oil seal outer ring, an oil seal cover, an oil seal outer sleeve and an oil seal inner sleeve, wherein the bearing oil seal outer ring, the oil seal outer sleeve and the oil seal inner sleeve are sequentially disposed between a housing and a shaft of the vacuum pump; the oil seal is a double oil seal and comprises a first oil seal and a second oil seal, the first oil seal is positioned between the outer ring of the bearing oil seal and the inner sleeve of the oil seal, and the second oil seal is positioned between the outer sleeve of the oil seal and the inner sleeve of the oil seal; an oil seal cover which is matched and connected with the outer sleeve of the oil seal is also arranged between the outer ring of the bearing oil seal and the inner sleeve of the oil seal.

The oil blanket in the above-mentioned patent is static oil blanket, needs to store more lubricating oil in inside for consuming, still can't effectual control lubricating oil's capacity to guarantee can not overflow to the vacuum chamber promptly and can reach permanent lubrication again.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides a dynamic lubrication seal which stores lubricating oil at a position far away from a piston ring seal, and the lubricating oil is thrown to the friction position of the piston ring seal by an oil slinger during working, so that the friction force is reduced, the deformation caused by heat generation is avoided, and the redundant lubricating oil flows back to an oil storage cavity, thereby realizing the dynamic lubrication seal.

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a vacuum pump bearing seal cooling body, includes casing and pivot, is provided with the hole on the casing, is provided with bearing and piston ring seal between casing and the pivot, bearing and piston ring seal are located the inner hole and distribute along the axial, one side that can correspond the bearing is provided with the oil storage chamber, is provided with the disc in the oil storage chamber, and the pivot is connected to the disc, is provided with the oil blanket cavity between bearing and the piston ring seal, the oil feed passageway of intercommunication oil storage chamber and oil blanket cavity is seted up at the hole top of casing, the oil return passageway of intercommunication oil storage chamber and oil blanket cavity is seted up to the hole bottom of casing.

Further piston ring seal includes rotating ring and quiet ring, the rotating ring is fixed in the pivot, and on the quiet ring was fixed in the casing, the rotating ring protrusion was to in the oil blanket cavity, the pivot corresponds oil blanket cavity department and is provided with the oil blanket guide pin bushing, the oil blanket guide pin bushing cover is on the outer periphery of rotating ring.

Furthermore, the peripheral surface of the oil seal guide sleeve is an inclined surface, and the outer diameter of the oil seal guide sleeve facing one side of the piston ring seal is smaller than the outer diameter of the oil seal guide sleeve facing one side of the bearing.

Further the oil inlet channel is obliquely arranged, one side, corresponding to the oil storage cavity, of the oil inlet channel is higher than the other side, and the oil inlet channel extends to the upper portion of the oil seal guide sleeve.

Further the outer lane of bearing corresponds the below in oil feed passageway and is provided with the inlet port.

The oil slinger further comprises a disc body, and a plurality of oil slinging bulges protruding out of the axial side face of the disc body are arranged on the disc body.

The oil throwing bulge is located at the circumferential edge of the disc body and is formed by cutting and bending the edge of the disc body.

Further, a temperature control pipe is arranged in the oil storage cavity, and a heat exchange medium is introduced into the temperature control pipe.

Compared with the prior art, the invention has the beneficial effects that: a large amount of lubricating oil are saved in the position of keeping away from piston ring seal spare, utilize the cooperation of disc and oil feed passageway, have mobile lubricating oil all the time in making the oil blanket cavity, prevent that a large amount of lubricating oil from piling up in the oil blanket cavity or lack lubricating oil.

Drawings

FIG. 1 is a cross-sectional view of a vacuum pump;

FIG. 2 is a cross-sectional view of the vacuum pump shaft seal cooling mechanism of the present invention;

FIG. 3 is a schematic view of the inner bore of the housing;

FIG. 4 is a perspective view of a bearing housing;

FIG. 5 is a front view of the oil slinger;

fig. 6 is a perspective view of the oil thrower.

Reference numerals: 1. a rotating shaft; 2. a housing; 21. an oil storage chamber; 22. an oil seal chamber; 3. a bearing; 4. a bearing seat; 41. an oil inlet hole; 5. a piston ring seal; 51. a stationary ring; 52. a moving ring; 61. an oil inlet channel; 62. an oil return passage; 7. an oil seal guide sleeve; 8. an oil slinger; 81. a tray body; 82. oil throwing bulge; 9. a gear; 10. and (4) controlling the temperature.

Detailed Description

An embodiment of the cooling mechanism for a shaft seal of a vacuum pump according to the present invention will be further described with reference to fig. 1 to 6.

In the description of the present invention, it should be noted that, for the terms of orientation, such as "central", "lateral (X)", "longitudinal (Y)", "vertical (Z)", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate that the orientation and positional relationship are based on the orientation or positional relationship shown in the drawings, only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, which should not be construed as limiting the specific scope of the present invention.

Furthermore, if the terms "first" and "second" are used for descriptive purposes only, they are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features. Thus, a definition of "a first" or "a second" feature may explicitly or implicitly include one or more of the features, and in the description of the invention, "a number" or "a number" means two or more unless explicitly specified otherwise.

The utility model provides a vacuum pump bearing seal cooling body, includes casing 2 and pivot 1, is provided with the hole on the casing 2, is provided with bearing 3 and piston ring seal 5 between casing 2 and the pivot 1, bearing 3 and piston ring seal 5 are located the hole and distribute along the axial, one side that can correspond bearing 3 is provided with oil storage chamber 21, is provided with disc 8 in the oil storage chamber 21, and pivot 1 is connected to disc 8, is provided with oil blanket cavity 22 between bearing 3 and the piston ring seal 5, oil feed passageway 61 of intercommunication oil storage chamber 21 and oil blanket cavity 22 is seted up at the hole top of casing 2, the oil return passageway 62 of intercommunication oil storage chamber 21 and oil blanket cavity 22 is seted up to the hole bottom of casing 2.

As shown in fig. 1, in this embodiment, the piston ring seal 5 is located on the side of the low-pressure chamber of the vacuum pump, and the bearing 3 is located on the outside (the side of relatively high pressure).

Filling lubricating oil in the oil storage cavity 21 before use, wherein the capacity of the lubricating oil is not higher than the bottom of the oil thrower 8 but is not higher than the oil return channel 62, when the lubricating oil is used, the rotating shaft 1 rotates at a high speed, the oil thrower 8 upwards takes up the lubricating oil and throws the lubricating oil into the oil inlet channel 61, the lubricating oil flows into the oil seal cavity 22 through the oil inlet channel 61, the lubricating oil contacts the piston ring sealing element 5 to reduce friction in the oil seal cavity 22, and redundant lubricating oil flows back into the oil storage cavity 21 along the oil return channel 62, so that excessive lubricating oil cannot exist in the oil seal cavity 22, and meanwhile, the lubricating and cooling of the piston ring sealing element 5 can be ensured.

In this embodiment, the volume of the lubricating oil in the oil storage chamber 21 is usually larger than that of the oil seal chamber 22, so as to achieve long-term practical use, but it can be supplemented at regular time or connected with an external oil circulation system to form circulation.

In this embodiment, the oil slinger 8 can be directly or indirectly connected with the rotating shaft 1, as shown in fig. 2, a gear 9 is arranged in the oil storage chamber 21 in this embodiment, the oil slinger 8 is indirectly connected with the rotating shaft 1 through the gear 9, and the oil slinger 8 can lubricate the gear 9 after slinging lubricating oil.

The piston ring seal 5 preferably comprises a movable ring 52 and a stationary ring 51, wherein the movable ring 52 is fixed on the rotating shaft 1, the stationary ring 51 is fixed on the housing 2, the movable ring 52 protrudes into the oil seal cavity 22, an oil seal guide 7 is arranged on the rotating shaft 1 corresponding to the oil seal cavity 22, and the oil seal guide 7 covers the outer circumferential surface of the movable ring 52.

Usually, a small gap is formed between the inner ring of the oil seal guide sleeve 7 and the outer circumferential surface of the movable ring 52, and lubricating oil can fill the gap to realize good lubrication and oil seal and achieve the effect of further sealing.

In the present embodiment, the outer peripheral surface of the oil seal guide 7 is preferably an inclined surface, and the outer diameter of the oil seal guide 7 facing the piston ring seal 5 is smaller than the outer diameter of the oil seal guide 7 facing the bearing 3.

After being thrown into the oil seal cavity 22, the lubricating oil falls down to the outer peripheral surface of the oil seal guide sleeve 7 and can slide to the opening along the inclined outer peripheral surface, and the lubricating oil can reach the gap between the oil seal guide sleeve 7 and the movable ring 52 more easily.

In the preferred embodiment, the oil inlet channel 61 is arranged obliquely, one side of the oil inlet channel 61 corresponding to the oil storage cavity 21 is higher than the other side, and the oil inlet channel 61 extends to the upper side of the oil seal guide sleeve 7.

The inclined oil inlet channel 61 can prevent lubricating oil from being adsorbed on the inner wall of the oil inlet channel 61 and standing still, so that the lubricating oil keeps flowing and drips on the oil seal guide sleeve 7.

In the embodiment, an oil inlet 41 is preferably arranged below the outer ring of the bearing 3 corresponding to the oil inlet channel 61.

As shown in fig. 2 and 4, generally speaking, in order to mount the bearing 3 and the housing 2, a bearing seat 4 is further provided in the housing 2, and is connected to the outer ring of the bearing 3, in this embodiment, taking two bearings 3 as an example, then the oil inlet 41 is opened on the bearing seat 4, and the oil inlet 41 is located between the two bearings 3, so that there is no need to open a hole on the outer ring of the bearing 3, and part of the lubricating oil drops before reaching the end of the oil inlet channel 61, and the part of the lubricating oil can reach the bearing 3 along the oil inlet 41 to lubricate the bearing 3.

As shown in fig. 5 and 6, the oil slinger 8 comprises a disc body 81, and a plurality of oil slinging protrusions 82 protruding from the axial side surface of the disc body 81 are arranged on the disc body 81.

The oil throwing bulge 82 is located at the circumferential edge of the disc body 81, and the oil throwing bulge 82 is formed by cutting and bending the edge of the disc body 81.

The plate body 81 is generally disk-shaped, and projects only in the oil slinging projection 82 portion outward in the axial direction, and the lubricating oil is whipped by the oil slinging projection 82 contacting the lubricating oil in the oil reservoir chamber 21.

In this embodiment, a temperature control pipe 10 is preferably disposed in the oil storage chamber 21, and a heat exchange medium is introduced into the temperature control pipe 10.

The temperature control pipe 10 is immersed in the lubricating oil, and the temperature control of the lubricating oil can be realized through a heat exchange medium so as to keep the lubricating oil in a good working temperature range.

The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.

Claims

1. The utility model provides a vacuum pump bearing seal cooling body, includes casing and pivot, is provided with the hole on the casing, is provided with bearing and piston ring seal between casing and the pivot, bearing and piston ring seal are located the hole and distribute its characterized in that along the axial: one side that can correspond the bearing is provided with the oil storage chamber, is provided with the disc in the oil storage chamber, and the pivot is connected to the disc, is provided with the oil blanket cavity between bearing and the piston ring seal, the oil feed passageway of intercommunication oil storage chamber and oil blanket cavity is seted up at the hole top of casing, the oil return passageway of intercommunication oil storage chamber and oil blanket cavity is seted up to the hole bottom of casing.

2. The vacuum pump shaft seal cooling mechanism according to claim 1, wherein: the piston ring sealing element comprises a movable ring and a static ring, the movable ring is fixed on the rotating shaft, the static ring is fixed on the shell, the movable ring protrudes into the oil seal cavity, an oil seal guide sleeve is arranged at the position, corresponding to the oil seal cavity, of the rotating shaft, and the oil seal guide sleeve covers the outer circumferential surface of the movable ring.

3. The vacuum pump shaft seal cooling mechanism according to claim 2, wherein: the outer peripheral surface of the oil seal guide sleeve is an inclined surface, and the outer diameter of the oil seal guide sleeve facing one side of the piston ring sealing element is smaller than the outer diameter of the oil seal guide sleeve facing one side of the bearing.

4. The vacuum pump shaft seal cooling mechanism according to claim 3, wherein: the oil inlet channel is obliquely arranged, one side, corresponding to the oil storage cavity, of the oil inlet channel is higher than the other side of the oil storage cavity, and the oil inlet channel extends to the upper portion of the oil seal guide sleeve.

5. The vacuum pump shaft seal cooling mechanism according to claim 4, wherein: and an oil inlet hole is formed in the outer ring of the bearing and below the oil inlet channel.

6. The vacuum pump shaft seal cooling mechanism according to claim 5, wherein: the oil slinger comprises a disc body, and a plurality of oil slinging bulges protruding out of the axial side face of the disc body are arranged on the disc body.

7. The vacuum pump shaft seal cooling mechanism according to claim 6, wherein: the edge of the steel plate is cut and bent.

8. The vacuum pump shaft seal cooling mechanism according to claim 7, wherein: and a temperature control pipe is arranged in the oil storage cavity, and a heat exchange medium is introduced into the temperature control pipe.