CN205918596U - Screw vacuum pump's sealing device - Google Patents
Screw vacuum pump's sealing device Download PDFInfo
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- CN205918596U CN205918596U CN201620705698.1U CN201620705698U CN205918596U CN 205918596 U CN205918596 U CN 205918596U CN 201620705698 U CN201620705698 U CN 201620705698U CN 205918596 U CN205918596 U CN 205918596U
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- sealing
- vacuum pump
- sleeve
- axle sleeve
- screw
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- Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
Abstract
The utility model provides a screw vacuum pump's sealing device belongs to vacuum pump technical field. It has solved the problem that sealing performance is better that how to make screw vacuum pump. Screw vacuum pump includes the pump body and fixes the side cap at pump body both ends, the working chamber has in the pump body, wear to be equipped with the screw rod in the working chamber, this sealing device sets up between screw rod and side cap and makes the working chamber with external sealed, this sealing device is including being annular axle sleeve, sleeve and mazy sealing member, axle sleeve and sleeve overlap respectively to be established on the screw rod, the inner of axle sleeve is on the screw rod by at the screw rod is vice, the outer end of axle sleeve is supported and is leaned on on the sleeve, sealing part sleeved establishes on the sleeve and circumference is fixed on the side cap, the outer end of axle sleeve has a plurality of steps, the inner of sealing member has the annular tooth portion corresponding with the step, annular tooth position is close to the axle sleeve in the top and the extension of step, be formed with labyrinth clearance between step and the annular tooth portion. Cooperation through above structure for screw vacuum pump's sealing performance is better.
Description
Technical field
This utility model belongs to vacuum pump technology field, is related to a kind of screw vacuum pump, particularly a kind of screw vacuum pump
Sealing device.
Background technology
The development of various vacuum pumps is more and more affected by vacuum application scenario at present, and general vacuum system cannot expire
The clean oil-free of cold foot and corrosion resistant requirement, therefore dry vacuum pump market demand is very big in recent years, and vacuum acquirement product is
The situation updating occurs, the vacuum system that substantial amounts of vacuum system with oil has been cleaned by oil-free replaces.Wherein, screw rod is true
Empty pump is using a pair of screw rod, and the air-breathing made synchronous high-speed reverse rotation in pump case and produce and the pumping of scavenging action set
Standby, it is the renewal product of oil sealing vacuum pump, can extract the gas occasion containing a large amount of vapor and a small amount of dust,
Domestic each big pharmacy and chemical enterprise are used widely.
For example, the applicant had once designed and developed a kind of seal failure prior-warning device of screw vacuum pump, and applied for
Chinese patent [application number: 201420204984.0；Authorization Notice No.: cn203847387u], vacuum disclosed in this patent documentation
Pump includes the pump housing, screw rod, end cap and the motor that inside is working chamber, and end cap blocks the two ends of the pump housing, and screw rod is arranged on work
Make in chamber, and one end of screw rod is connected with motor through end cap, screw rod is in and is provided between the part of end cap section and end cap
Sealing structure, seal failure prior-warning device includes cavity and oil through in end cap, and cavity is located at the pump housing and sealing structure
Between, screw rod passes through cavity, and one end of oil through is connected with cavity, and the other end is communicated with the external world.This screw vacuum pump close
Envelope early warning failure device has and can find screw vacuum pump seal failure in time, solves the advantages of reveal in time.
But, above-mentioned screw vacuum pump there is problems: adopts between the fixed plate of above-mentioned screw vacuum pump and screw rod
With lip-type packing sealing, due to being dry-type encapsulated herein, after the time one is long, lip-type packing easily produces abrasion, thus leading
Cause oil liquid leakage to work intracavity, affect the normal work of vacuum pump.
Content of the invention
The purpose of this utility model be there are the problems referred to above for existing technology it is proposed that a kind of screw vacuum pump close
Seal apparatus, this utility model solve technical problem be how to make screw vacuum pump sealing property more preferable.
The purpose of this utility model can be realized by following technical proposal: a kind of sealing device of screw vacuum pump, institute
State screw vacuum pump to include the pump housing and be fixed on the side cover at pump housing two ends, in the described pump housing, there is working chamber, described work intracavity
It is equipped with screw rod, described sealing device is arranged between screw rod and side cover and makes working chamber with extraneous sealing it is characterised in that institute
State sealing device and include axle sleeve ringwise, sleeve and mazy sealing member, described axle sleeve and sleeve are respectively sleeved at screw rod
On, the inner of described axle sleeve is resisted against on the screw pair of screw rod, and the outer end of described axle sleeve is resisted against on sleeve, described sealing member set
Be located on sleeve and circumferentially fixed on side cover, the outer end of described axle sleeve has multiple steps, and the inner of described sealing member has
The annular tooth part corresponding with step, described annular tooth part is located at the top of step and extends close to axle sleeve, described step and ring
It is formed with labyrinth clearance between shape teeth portion.
The operation principle of the sealing device of this screw vacuum pump is that have axle sleeve and and the axle sleeve of multiple steps by setting
The labyrinth matching the labyrinth clearance forming complications accordingly, due to not contacting between sealing member and axle sleeve, keep away
Exempt from sealing member and produce abrasion because axle sleeve contacts, thus improving the service life of sealing device；Meanwhile, leakage fluid is passing through
Labyrinth clearance can produce throttle effect and reach the purpose of Drain Resistance；So that the sealing property of screw vacuum pump is more preferable.
In the sealing device of above-mentioned screw vacuum pump, described sealing member is by multiple sealing tooth socket combinations annular in shape
Form, each adjacent mutual tight fit of sealing tooth.Sealing member is socketed to form by sealing tooth split, makes sealing device assembling side
Just.
In the sealing device of above-mentioned screw vacuum pump, described sealing tooth includes body and the annular tooth part of ring-type, institute
The internal diameter stating annular tooth part is identical with the internal diameter of body, and the external diameter of described annular tooth part is less than the external diameter of body, and each is adjacent
Form space ringwise between described annular tooth part, between each described sealing tooth and axle sleeve, be formed with the gap in l type, institute
State gap and corresponding space to be connected formation labyrinth clearance.The a series of space that formed by annular tooth part and l type
Gap, thus forming the labyrinth clearance circling between screw rod and side cover, can when Leakage Energy liquor stream is through labyrinth clearance
Slow down the flow velocity of fluid, and stop fluid from entering working chamber.
In the sealing device of above-mentioned screw vacuum pump, it is provided with the skeleton oil of ring-type between described sealing member and sleeve
Envelope, the outer end of described sealing member has the slot to make way of annular, and described outside framework oil seal is located in described slot to make way and is set in sleeve
On, the periphery of described outside framework oil seal is resisted against on sealing member, and the inner circumferential of described outside framework oil seal is resisted against on sleeve.By in sealing
Outside framework oil seal is set up in the outer end of part, further enhancing the sealing property of sealing device.
In the sealing device of above-mentioned screw vacuum pump, it is provided between the inner of described axle sleeve and the screw pair of screw rod
Dry grinding sealing member.The sealing property of sealing device can be further enhanced by setting dry grinding sealing member.
In the sealing device of above-mentioned screw vacuum pump, the quantity of described annular tooth part is identical with the quantity of step, institute
The quantity stating step is 2～5.By the quantity of appropriate design step and annular tooth part, thus effectively improving sealing device
Sealing property.
Compared with prior art, the sealing device of this screw vacuum pump has the advantage that there is multiple by design
The axle sleeve of rank and the labyrinth matching with axle sleeve, form the labyrinth clearance circling between the two, thus effectively
Fluid is stoped to enter working chamber；Meanwhile, by setting up outside framework oil seal and dry grinding sealing member, further increase sealing device
Sealing property；By the cooperation of above structure so that the sealing property of screw vacuum pump is more preferable.
Brief description
Fig. 1 is the structural representation of this screw vacuum pump.
Fig. 2 is the partial enlarged drawing at a in Fig. 1.
Fig. 3 is the partial structural diagram of the sealing device of this screw vacuum pump.
In figure, 1, the pump housing；2nd, side cover；3rd, working chamber；4th, screw rod；41st, screw pair；5th, axle sleeve；51st, step；6th, sleeve；7、
Sealing member；8th, seal tooth；81st, body；82nd, annular tooth part；9th, labyrinth clearance；91st, space；92nd, gap；10th, outside framework oil seal.
Specific embodiment
The following is specific embodiment of the utility model and combine accompanying drawing, the technical solution of the utility model is made further
Description, but this utility model is not limited to these embodiments.
Screw vacuum pump includes the pump housing 1, side cover 2, working chamber 3, screw rod 4, screw pair 41 and sealing device.This sealing fills
Put including axle sleeve 5, step 51, sleeve 6, sealing member 7, sealing tooth 8, body 81, annular tooth part 82, labyrinth clearance 9, space 91,
Gap 92, outside framework oil seal 10.
Specifically, as shown in figure 1, this screw vacuum pump includes the pump housing 1 and the side cover 2 being fixed on the pump housing 1 two ends.The pump housing
There is in 1 working chamber 3, in working chamber 3, be equipped with screw rod 4.Sealing device is arranged between screw rod 4 and side cover 2 and makes working chamber 3
With extraneous sealing.
As shown in Fig. 2 sealing device includes axle sleeve 5 ringwise, sleeve 6 and mazy sealing member 7, axle sleeve 5 and set
Cylinder 6 is respectively sleeved on screw rod 4.The inner of axle sleeve 5 is resisted against on the screw pair 41 of screw rod 4, and the outer end of axle sleeve 5 is resisted against sleeve
On 6, sealing member 7 be set on sleeve 6 and circumferentially fixed on side cover 2, the outer end of axle sleeve 5 has multiple steps 51, sealing member 7
The inner there is the annular tooth part 82 corresponding with step 51, annular tooth part 82 is located at the top of step 51 and extends close to axle sleeve
5, it is formed with labyrinth clearance 9 between step 51 and annular tooth part 82.
As shown in figure 3, sealing tooth 8 includes body 81 and annular tooth part 82, the internal diameter of annular tooth part 82 and the body of ring-type
81 internal diameter is identical, and the external diameter of annular tooth part 82 is less than the external diameter of body 81, and formation between each adjacent annular tooth part 82 is in
The space 91 of annular, is formed with gap 92, gap 92 and the corresponding space 91 in l type between each sealing tooth 8 and axle sleeve 5
Be connected formation labyrinth clearance 9.The quantity of annular tooth part 82 is identical with the quantity of step 51, and the quantity of step 51 is 2～5.
As shown in Figures 2 and 3, it is provided with the outside framework oil seal 10 of ring-type, the outer end of sealing member 7 between sealing member 7 and sleeve 6
There is the slot to make way of annular, outside framework oil seal 10 is located in slot to make way and is set on sleeve 6, and the periphery of outside framework oil seal 10 is resisted against
On sealing member 7, the inner circumferential of outside framework oil seal 10 is resisted against on sleeve 6.Arrange between the screw pair 41 of the inner of axle sleeve 5 and screw rod 4
There is dry grinding sealing member.
Specific embodiment described herein is only explanation for example to this utility model spirit.This utility model institute
Belong to those skilled in the art described specific embodiment can be made with various modifications or supplement or using similar
Mode substitute, but without departing from of the present utility model spirit or surmount scope defined in appended claims.
Although more employ herein the pump housing 1, side cover 2, working chamber 3, screw rod 4, screw pair 41, axle sleeve 5, step 51,
Sleeve 6, sealing member 7, sealing tooth 8, body 81, annular tooth part 82, labyrinth clearance 9, space 91, gap 92, outside framework oil seal 10 etc.
Term, but it is not precluded from the probability using other terms.It is used for the purpose of more easily describing and explaining using these terms
Essence of the present utility model；It is all contrary with this utility model spirit for being construed as any additional restriction.
Claims (6)
1. a kind of sealing device of screw vacuum pump, described screw vacuum pump includes the pump housing (1) and is fixed on the pump housing (1) two ends
Side cover (2), has working chamber (3), is equipped with screw rod (4), described sealing device in described working chamber (3) in the described pump housing (1)
It is arranged between screw rod (4) and side cover (2) and makes working chamber (3) and extraneous sealing it is characterised in that described sealing device includes
Axle sleeve (5) ringwise, sleeve (6) and mazy sealing member (7), described axle sleeve (5) and sleeve (6) are respectively sleeved at screw rod
(4), on, the inner of described axle sleeve (5) is resisted against on the screw pair (41) of screw rod (4), and the outer end of described axle sleeve (5) is resisted against set
On cylinder (6), described sealing member (7) is set in sleeve (6) above and on circumferentially fixed (2) in side cover, the outer end tool of described axle sleeve (5)
There are multiple steps (51), the inner of described sealing member (7) has the annular tooth part (82) corresponding with step (51), described annular
Teeth portion (82) is located at the top of step (51) and extends close to axle sleeve (5), shape between described step (51) and annular tooth part (82)
Become to have labyrinth clearance (9).
2. the sealing device of screw vacuum pump according to claim 1 is it is characterised in that described sealing member (7) is by multiple
Sealing tooth (8) socket annular in shape combines, each adjacent sealing tooth (8) mutually tight fit.
3. the sealing device of screw vacuum pump according to claim 2 is it is characterised in that described sealing tooth (8) includes ring
The body (81) of shape and annular tooth part (82), the internal diameter of described annular tooth part (82) is identical with the internal diameter of body (81), described ring
The external diameter of shape teeth portion (82) is less than the external diameter of body (81), is formed ringwise between each adjacent described annular tooth part (82)
Space (91), is formed with gap (92) in l type between each described sealing tooth (8) and axle sleeve (5), described gap (92) with right
The space (91) answered is connected and forms labyrinth clearance (9).
4. the sealing device of the screw vacuum pump according to claim 1 or 2 or 3 is it is characterised in that described sealing member (7)
It is provided with the outside framework oil seal (10) of ring-type and sleeve (6) between, the outer end of described sealing member (7) has the slot to make way of annular, institute
State outside framework oil seal (10) to be located in described slot to make way and be set on sleeve (6), the periphery of described outside framework oil seal (10) is resisted against
On sealing member (7), the inner circumferential of described outside framework oil seal (10) is resisted against on sleeve (6).
5. the sealing device of screw vacuum pump according to claim 1 or 2 or 3 is it is characterised in that described axle sleeve (5)
It is provided with dry grinding sealing member between the inner and the screw pair (41) of screw rod (4).
6. the sealing device of the screw vacuum pump according to claim 1 or 2 or 3 is it is characterised in that described annular tooth part
(82) quantity is identical with the quantity of step (51), and the quantity of described step (51) is 2～5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620705698.1U CN205918596U (en) | 2016-06-30 | 2016-06-30 | Screw vacuum pump's sealing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620705698.1U CN205918596U (en) | 2016-06-30 | 2016-06-30 | Screw vacuum pump's sealing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205918596U true CN205918596U (en) | 2017-02-01 |
Family
ID=57874337
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620705698.1U Active CN205918596U (en) | 2016-06-30 | 2016-06-30 | Screw vacuum pump's sealing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205918596U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107014745A (en) * | 2017-06-01 | 2017-08-04 | 北京强度环境研究所 | A kind of crossing cabin shaft seal for combined environment test |
-
2016
- 2016-06-30 CN CN201620705698.1U patent/CN205918596U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107014745A (en) * | 2017-06-01 | 2017-08-04 | 北京强度环境研究所 | A kind of crossing cabin shaft seal for combined environment test |
| CN107014745B (en) * | 2017-06-01 | 2023-08-29 | 北京强度环境研究所 | Cabin penetrating shaft sealing piece for comprehensive environment test |
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| GR01 | Patent grant |