CN201884245U - Shaft seal structure for vacuum pump - Google Patents
Shaft seal structure for vacuum pump Download PDFInfo
- Publication number
- CN201884245U CN201884245U CN2010206438799U CN201020643879U CN201884245U CN 201884245 U CN201884245 U CN 201884245U CN 2010206438799 U CN2010206438799 U CN 2010206438799U CN 201020643879 U CN201020643879 U CN 201020643879U CN 201884245 U CN201884245 U CN 201884245U
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- Prior art keywords
- oil sealing
- cover
- oil
- shaft seal
- seal structure
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- 230000003068 static effect Effects 0.000 claims abstract description 5
- 238000007789 sealing Methods 0.000 claims description 216
- 238000012856 packing Methods 0.000 claims description 21
- 238000009434 installation Methods 0.000 claims description 8
- 230000000670 limiting effect Effects 0.000 claims description 6
- 238000005121 nitriding Methods 0.000 claims description 3
- 210000001258 synovial membrane Anatomy 0.000 claims description 3
- 239000000314 lubricant Substances 0.000 description 5
- 239000000945 filler Substances 0.000 description 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000008186 active pharmaceutical agent Substances 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 230000007096 poisonous effect Effects 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Sealing Of Bearings (AREA)
Abstract
The utility model relates to a vacuum pump component, in particular to a shaft seal structure for a vacuum pump. The shaft seal structure is positioned between a casing and a shaft, one side of the shaft seal structure is a ball bearing, the other side of the shaft seal structure is a vacuum cavity, the shaft seal structure includes an oil seal inner casing, an oil seal cover and an oil seal outer casing, the oil seal inner casing, the oil seal cover and the oil seal outer casing are sleeved in sequence between the shaft and the casing, the oil seal inner casing is hermetically connected with the shaft, the oil seal outer casing is hermetically connected with the casing and the oil seal cover respectively, and the oil seal cover is hermetically connected with the oil seal inner casing through a plurality of layers of secondary oil seal. The shaft seal structure fundamentally solves the problem of shaft seal leakage, has a compact structure, does not affect the cooperative relationship between the bearing and the casing and that between the bearing and the shaft, ensures the mounting position of the bearing during the assembly of the vacuum pump, and is very important to increase the operating stability of the bearing. Through the combination of dynamic seal and static seal as well as the adoption of multi-layer seal, the problem of pump oil leakage is fundamentally solved.
Description
Skill is stated the field
The utility model relates to vacuum pump part, specifically a kind of vacuum pump shaft seal structure.
Background technique
Axle envelope is to prevent that pump shaft and housing place from leaking and the seal arrangement of setting.Axle envelope form commonly used has packing seal, mechanical seal and power envelope.
The axle of reciprocating pump seals normally packing seal.When conveying does not allow leaking medium, can adopt diaphragm-type reciprocating pump.The axle envelope of rotary pump (containing vane type oil pump, rotor pump etc.) mainly contains packing seal, mechanical seal and dynamic seal.
One, packing seal
Packing seal structure is simple, low price, easy to maintenance, but leakage rate is big, power consumption penalty is big.Therefore packing seal is used to carry general medium, as water etc.; Generally be not suitable for oil and chemical medium, particularly can not be used in valuable, explosive and the poisonous medium.
Two, mechanical seal
The good sealing effect of mechanical seal (also claiming end face seal), leakage rate is very little, and the life-span is long; But price is expensive, and installation and processing is maintained than general seal request height.
Mechanical seal is applicable to transfer oil and chemical medium, can be used for various different viscosities, severe corrosive and contains the medium of particle.API Std API610 (the 8th edition) regulation: except that the user has regulation, should equip integrated mechanical sealing.
Three, dynamic seal
Dynamic seal can be divided into the sealing of notopodium formula and sub-propeller seals two classes.The centrifugal action of backrest blade (or sub-propeller) makes a pressure medium at envelope place drop to normal pressure or negative pressure state during pump work, and pump is not in use leaked.Centrifugal force disappears during parking, and the seal action of back blade (or sub-propeller) lost efficacy, and at this moment played seal action by parking sealing arrangement.
With adopt packing seal in the supporting parking sealing arrangement of notopodium formula (or sub-propeller) morely.Packing seal has two kinds of general expression and mechanical force-looses.The general expression packing seal is similar to general stuffing sealed pump, requires axle envelope place to keep micro positive pressure, to avoid the dry friction of filler.Counterweight is adopted in the packing seal of machinery force-loose, and pump filler when operation is unclamped, and filler compresses during parking.
The dynamic seal reliable performance, low price, easy to maintenance, be applicable to carry and contain the more medium of solid particle, as the ore pulp pump in the phosphoric acid industry, shurry pump etc.Shortcoming is that power loss is big than mechanical seal, and the life-span of its parking sealing arrangement is shorter.
The model utility content
In order to solve the problem that existing axle envelope is revealed, the purpose of this utility model is to provide a kind of vacuum pump shaft seal structure.This shaft seal structure adopts multilayer level formula seal form, has thoroughly solved the problem of pump oil seepage.
The purpose of this utility model is achieved through the following technical solutions:
Shaft seal structure of the present utility model is between housing and axle, and a side of shaft seal structure is the ball ball bearing, and opposite side is a vacuum chamber; Described shaft seal structure comprises cover, oil sealing cover and oil sealing overcoat in the oil sealing, cover, oil sealing cover and oil sealing overcoat are set between axle and the housing successively in the oil sealing, cover is connected with shaft sealing in the oil sealing, the oil sealing overcoat is tightly connected with housing and oil sealing cover respectively, and the oil sealing cover is tightly connected by cover in multi-level oil sealing and the oil sealing.
Wherein: the oil sealing near vacuum chamber in the described multi-level oil sealing is located by the seam on the oil sealing cover inner surface, by being set in the stop collar axial limiting that puts in the oil sealing; Separate by packing ring between other oil sealing in the multi-level oil sealing, form the sealing of level formula; Described multi-level oil sealing is the tri-layer oil sealing, comprises first oil sealing, second oil sealing and the 3rd oil sealing, and the axial cross section of first oil sealing, second oil sealing and the 3rd oil sealing is " J " shape, is tightly connected by the outer surface that overlaps in oil sealing lip and the oil sealing respectively; Described first oil sealing separates by packing ring between second oil sealing and the 3rd oil sealing and between the 3rd oil sealing and the oil sealing overcoat by the stop collar axial limiting; The installation direction of second oil sealing and the 3rd oil sealing is opposite with the installation direction of first oil sealing; The fitting surface of second oil sealing and the 3rd oil sealing and oil sealing lining the outer surface of is provided with glossy synovial membrane, and the internal surface of first oil sealing is the surface of handling through nitriding; Between first oil sealing and the oil sealing cover, between stop collar and the oil sealing cover, in first oil sealing and the oil sealing between the cover, in second oil sealing and the oil sealing between the cover, the 3rd oil sealing overlap with oil sealing is interior between, between second oil sealing and the oil sealing overcoat, between the 3rd oil sealing and the oil sealing overcoat, be interference fit between packing ring and the oil sealing overcoat; Described oil sealing overcoat is provided with " V " type opening towards an end of ball ball bearing, and the bore that is somebody's turn to do " V " type opening is higher than the interior ring of ball ball bearing; Be respectively equipped with O-ring seals between cover and the axle and between oil sealing overcoat and the housing in the described oil sealing, carry out static seal by O-ring seals; Be interference fit between described oil sealing overcoat and the housing.
Advantage of the present utility model and good effect are:
1. the utility model thoroughly solves the shaft sealing leakage problem, and compact structure does not influence the matching relationship between bearing and housing and the axle, helps guaranteeing the mounting point of vacuum pump assembling middle (center) bearing, and the run stability that improves bearing is played very important function; Utilize motive sealing to combine, adopt multilayer level formula seal form, thoroughly solve pump oil seepage problem with static seal.
2. the utility model is simple in structure, and small and exquisite easy for installation, cost is low flexibly, is fit to produce in batches.
Description of drawings
Fig. 1 is an internal structure schematic representation of the present utility model;
Wherein: 1 is cover O-ring seals in first oil sealing, and 2 is axle, and 3 is cover O-ring seals in second oil sealing, 4 is limited ring, and 5 is cover in the oil sealing, and 6 is stop collar, 7 is first oil sealing, and 8 is the oil sealing cover, and 9 is second oil sealing, 10 is packing ring, and 11 is the 3rd oil sealing, and 12 is the oil sealing overcoat, 13 is the first oil sealing overcoat O-ring seals, 14 is the second oil sealing overcoat O-ring seals, and 15 is housing, and 16 is the ball ball bearing.
Embodiment
The utility model is described in further detail below in conjunction with accompanying drawing.
As shown in Figure 1, shaft seal structure of the present utility model can not influence the fixed position of ball ball bearing 16 between housing 15 and axle 2, and a side (right side) of shaft seal structure is ball ball bearing 17 (high voltage terminal), and opposite side (left side) is vacuum chamber (low voltage terminal).
The utility model comprises cover 5 in the oil sealing, oil sealing cover 8 and oil sealing overcoat 12, cover 5 is set on the axle 2 in the oil sealing, in oil sealing, be respectively equipped with between cover 5 and the axle 2 and overlap cover O-ring seals 3 in the O-ring seals 1 and second oil sealing in first oil sealing, cover O-ring seals 1 is placed in the seal groove that axle 2 outer surfaces offer in first oil sealing, cover O-ring seals 3 is by the seam location of cover 5 internal surfaces in the oil sealing in second oil sealing, by being set in limited ring 4 axial limitings, the internal surface of cover 5 is tightly connected by the outer surface of cover O-ring seals 3 in the cover O-ring seals 1 and second oil sealing in first oil sealing with axle 2 in the oil sealing.
The internal surface of oil sealing cover 8 is tightly connected by the outer surface 5 that overlaps in multi-level oil sealing and the oil sealing, multi-level oil sealing of the present utility model comprises first oil sealing 7, second oil sealing 9 and the 3rd oil sealing 11, wherein first oil sealing 7 is near vacuum chamber, and first oil sealing 7 is by the location of the seam on oil sealing cover 8 internal surfaces, by being set in stop collar 6 axial limitings on cover 5 outer surfaces in the oil sealing; Separate by packing ring 10 between second oil sealing 9 and the 3rd oil sealing 11 and between the 3rd oil sealing 11 and the oil sealing overcoat 12, form the sealing of level formula, can effectively intercept oil gas from ball ball bearing 16.Level formula sealing of the present utility model also can be more multi-layered, separates by packing ring 10 between each layer.The axial cross section of first oil sealing 7, second oil sealing 9 and the 3rd oil sealing 11 is " J " shape, outer surface by cover 5 in oil sealing lip and the oil sealing is tightly connected respectively, the installation direction of second oil sealing 9 and the 3rd oil sealing 11 is opposite with the installation direction of first oil sealing 7, promptly " J " shape of first oil sealing 7 bottom left, " J " shape of second oil sealing 9 and the 3rd oil sealing 11 bottom is to the right.Second oil sealing 9 and the 3rd oil sealing 11 are provided with glossy synovial membrane with the fitting surface of the interior cover of oil sealing 5 outer surfaces, and second oil sealing 9 and the 3rd oil sealing 11 can effectively reduce oil gas with cooperating of the interior cover 5 of oil sealing and reveal; The internal surface of first oil sealing 7 needs to handle through nitriding, also effectively the isolated vacuum chamber to the influence of each oil sealing.Between first oil sealing 7 and the oil sealing cover 8, between stop collar 6 and the oil sealing cover 8, in first oil sealing 7 and the oil sealing between the cover 5, in second oil sealing 9 and the oil sealing between the cover 5, the 3rd oil sealing 11 overlap 5 with oil sealing is interior between, between second oil sealing 9 and the oil sealing overcoat 12, between the 3rd oil sealing 11 and the oil sealing overcoat 12, be interference fit between packing ring 10 and the oil sealing overcoat 12, can guarantee that the lubricant oil in ball ball bearing 16 chambeies does not enter in the vacuum chamber, avoids polluting vacuum chamber.
The internal surface of oil sealing overcoat 12 has closely and cooperates respectively with between the outer surface of stop collar 6 and first oil sealing 7, can effectively carry out the sealing of seepage gas; Have closely between the internal surface of the outer surface of oil sealing overcoat 12 and housing 15 to cooperate, be interference fit, can guarantee that the lubricant oil in ball ball bearing 16 chambeies does not enter in the vacuum chamber, avoid polluting vacuum chamber; Have two seal grooves on the outer surface of oil sealing overcoat 12, be equipped with the first oil sealing overcoat O-ring seals 13 and the second oil sealing overcoat O-ring seals 14 in the seal groove respectively, housing 15 is tightly connected by the outer surface of the first oil sealing overcoat O-ring seals 13 and the second oil sealing overcoat O-ring seals 14 and oil sealing overcoat 12, can carry out the sealing of seepage gas effectively.Oil sealing overcoat 12 is provided with " V " type opening towards an end of ball ball bearing 16, and bore that should " V " type opening is higher than the interior ring of ball ball bearing 16, makes the lubricant oil in ball ball bearing 16 chambeies can the sufficient lubrication bearing.
The utility model adopts the tri-layer oil sealing sealing to carry out motive sealing, and O-ring seals carries out static seal, thereby guarantees that lubricant oil is thoroughly shielded outside vacuum chamber in the ball ball bearing chamber.During use, shaft seal structure of the present utility model is placed in the vacuum pump housing, and adopt the O-ring seals sealing between the housing, compact structure lumps together bearing lubrication and pump housing sealed junction, is convenient to assembling and setting, can thoroughly solve the problem of pump oil leakage.This structure can guarantee that lubricant oil does not enter in the vacuum chamber in the bearing bore, avoids polluting vacuum chamber.In pumping process, can keep vacuum environment not to be subjected to oil vapour pollution, be applicable to industries such as semiconductor, petrochemical industry, metallurgy, food, medicine, electronics, packing, printing.
Claims (9)
1. vacuum pump shaft seal structure is characterized in that: this shaft seal structure is positioned between housing (15) and the axle (2), and a side of shaft seal structure is ball ball bearing (17), and opposite side is a vacuum chamber; Described shaft seal structure comprises cover (5), oil sealing cover (8) and oil sealing overcoat (12) in the oil sealing, cover (5), oil sealing cover (8) and oil sealing overcoat (12) are set between axle (2) and the housing (15) successively in the oil sealing, cover (5) is tightly connected with axle (2) in the oil sealing, oil sealing overcoat (12) is tightly connected with housing (15) and oil sealing cover (8) respectively, and oil sealing cover (8) is tightly connected by cover (5) in multi-level oil sealing and the oil sealing.
2. by the described vacuum pump shaft seal structure of claim 1, it is characterized in that: the oil sealing near vacuum chamber in the described multi-level oil sealing is located by the seam on oil sealing cover (8) internal surface, by being set in stop collar (6) axial limiting on the cover (5) in the oil sealing; Separate by packing ring (10) between other oil sealing in the multi-level oil sealing, form the sealing of level formula.
3. by claim 1 or 2 described vacuum pump shaft seal structures, it is characterized in that: described multi-level oil sealing is the tri-layer oil sealing, comprise first oil sealing (7), second oil sealing (9) and the 3rd oil sealing (11), the axial cross section of first oil sealing (7), second oil sealing (9) and the 3rd oil sealing (11) is " J " shape, and the outer surface by cover (5) in oil sealing lip and the oil sealing is tightly connected respectively; Described first oil sealing (7) separates by packing ring (10) between second oil sealing (9) and the 3rd oil sealing (11) and between the 3rd oil sealing (11) and the oil sealing overcoat (12) by stop collar (6) axial limiting.
4. by the described vacuum pump shaft seal structure of claim 3, it is characterized in that: the installation direction of described second oil sealing (9) and the 3rd oil sealing (11) is opposite with the installation direction of first oil sealing (7).
5. by the described vacuum pump shaft seal structure of claim 3, it is characterized in that: described second oil sealing (9) and the 3rd oil sealing (11) are provided with glossy synovial membrane with the fitting surface of the interior cover of oil sealing (5) outer surface, and the internal surface of first oil sealing (7) is the surface of handling through nitriding.
6. by the described vacuum pump shaft seal structure of claim 3, it is characterized in that: between described first oil sealing (7) and the oil sealing cover (8), between stop collar (6) and the oil sealing cover (8), in first oil sealing (7) and the oil sealing between the cover (5), second oil sealing (9) and oil sealing interiorly overlap between (5), the 3rd oil sealing (11) and oil sealing interiorly overlap between (5), between second oil sealing (9) and the oil sealing overcoat (12), between the 3rd oil sealing (11) and the oil sealing overcoat (12), be interference fit between packing ring (10) and the oil sealing overcoat (12).
7. by the described vacuum pump shaft seal structure of claim 1, it is characterized in that: described oil sealing overcoat (12) is provided with " V " type opening towards an end of ball ball bearing (16), and the bore that is somebody's turn to do " V " type opening is higher than the interior ring of ball ball bearing (16).
8. by the described vacuum pump shaft seal structure of claim 1, it is characterized in that: be respectively equipped with O-ring seals between cover (5) and the axle (2) and between oil sealing overcoat (12) and the housing (15) in the described oil sealing, carry out static seal by O-ring seals.
9. by the described vacuum pump shaft seal structure of claim 1, it is characterized in that: be interference fit between described oil sealing overcoat (12) and the housing (15).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206438799U CN201884245U (en) | 2010-12-06 | 2010-12-06 | Shaft seal structure for vacuum pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206438799U CN201884245U (en) | 2010-12-06 | 2010-12-06 | Shaft seal structure for vacuum pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201884245U true CN201884245U (en) | 2011-06-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010206438799U Expired - Fee Related CN201884245U (en) | 2010-12-06 | 2010-12-06 | Shaft seal structure for vacuum pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201884245U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103104437A (en) * | 2011-11-11 | 2013-05-15 | 中国科学院沈阳科学仪器研制中心有限公司 | Vacuum pump seal structure |
-
2010
- 2010-12-06 CN CN2010206438799U patent/CN201884245U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103104437A (en) * | 2011-11-11 | 2013-05-15 | 中国科学院沈阳科学仪器研制中心有限公司 | Vacuum pump seal structure |
| CN103104437B (en) * | 2011-11-11 | 2015-04-01 | 中国科学院沈阳科学仪器研制中心有限公司 | Vacuum pump seal structure |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110629 Termination date: 20151206 |
|
| EXPY | Termination of patent right or utility model |