CN204239240U - A kind of variable pitch screw vacuum pump - Google Patents
A kind of variable pitch screw vacuum pump Download PDFInfo
- Publication number
- CN204239240U CN204239240U CN201420493661.8U CN201420493661U CN204239240U CN 204239240 U CN204239240 U CN 204239240U CN 201420493661 U CN201420493661 U CN 201420493661U CN 204239240 U CN204239240 U CN 204239240U
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- China
- Prior art keywords
- thread
- screw
- gear piece
- screw thread
- rotating shaft
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Abstract
The utility model relates to vacuum pump technology field, particularly relates to a kind of variable pitch screw vacuum pump; The utility model comprises the pump housing, pump chamber is provided with in the pump housing, one group of screw rotor is installed in pump chamber, the thread that described screw rotor comprises rotating shaft and is fixedly connected with rotating shaft, described thread comprises several and is placed on screw thread gear piece outside axle sleeve, the surface of contact that described screw thread gear piece abuts with rotating shaft is provided with card convex, and described rotating shaft is provided with the draw-in groove matched with card convex, and card convex snaps in draw-in groove; Screw thread gear piece is spliced into continuous print thread.Preferably, the curved angle of described screw thread gear piece is less than 45 degree; The pitch of described thread is: L=l*(1+ka).The utility model adopts Split type structure and interface arrangment, and it is convenient to implement; Thread pitch increases along with angle and increases simultaneously, and suitable improves compression ratio; Improve pumping performance.
Description
Technical field
The utility model relates to vacuum pump technology field, particularly relates to a kind of variable pitch screw vacuum pump.
Background technique
Along with industrial expansion, the production technology of precision element is extensively improved; When producing precision element, the purifying degree of its production environment requires improving constantly; In order to obtain better production environment, a lot of elements is produced all under vacuo, is processed; And the acquisition of vacuum, generally depend on vacuum pump, in order to obtain comparatively clean vacuum, the requirement of dry vacuum pump is more and more higher.Comparatively common dry vacuum pump has claw vacuum pump, Roots pump, screw vacuum pump etc. at present.
Screw vacuum pump, except processed complex, has the advantage that other dry vacuum pumps are incomparable in use, and as screw vacuum pump structure is simple, component are few; And running is reliable, the life-span is long.In the place that environmental requirement is higher, generally all select screw vacuum pump.
Screw vacuum pump in use, consider compression ratio, generally select variable pitch screw vacuum pump at present, because screw flight tine length is comparatively large, once incompleteness appears in part, this screw rod just cancels, therefore make screw vacuum pump processing cost higher, and screw rod in use, once thread damages, must change; Maintenance cost is high.
Model utility content
The purpose of this utility model is to solve the deficiencies in the prior art, and provide a kind of variable pitch screw vacuum pump, processing cost, the maintenance cost of this screw vacuum pump are low.
For achieving the above object, the technical solution adopted in the utility model is:
A kind of variable pitch screw vacuum pump, comprise the pump housing, pump chamber is provided with in the pump housing, one group of screw rotor is installed in pump chamber, the thread that described screw rotor comprises rotating shaft and is fixedly connected with rotating shaft, described thread comprises several and is placed on screw thread gear piece outside axle sleeve, and the surface of contact that described screw thread gear piece abuts with rotating shaft is provided with card convex, described rotating shaft is provided with the draw-in groove matched with card convex, and card convex snaps in draw-in groove; Screw thread gear piece is spliced into continuous print thread.Preferably, the curved angle of described screw thread gear piece is less than 45 degree; The pitch of described thread is: L=l × (1+ka).
Further, sealant layer is provided with between described card convex and draw-in groove.
Further, sealant layer is provided with between two adjacent screw thread gear pieces.
Further, in two adjacent screw thread gear pieces, one of them screw thread gear piece is provided with connection projection in joint, and another screw thread gear piece is provided with the hole clipping matched with projection in joint.
The beneficial effect that the utility model obtains is: the utility model adopts Split type structure and interface arrangment, and it is convenient to implement; Thread pitch increases along with angle and increases simultaneously, and suitable improves compression ratio; Improve pumping performance.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
Fig. 2 is a kind of structural representation of rotor.
Fig. 3 is a kind of structural representation of screw thread gear piece.
Fig. 4 is the second structural representation of screw thread gear piece.
Fig. 5 is the 3rd structural representation of screw thread gear piece.
Fig. 6 is the structural representation of rotating shaft.
Reference character is:
1---the pump housing 2---rotating shaft 3---thread
31---screw thread gear piece 32---card convex 33---projections
34---hole clipping 21---draw-in groove.
Embodiment
Below in conjunction with the drawings and specific embodiments, book is described further to the utility model.
Embodiment: see Fig. 1 to Fig. 6.
A kind of variable pitch screw vacuum pump, comprise the pump housing 1, pump chamber is provided with in the pump housing 1, one group of screw rotor is installed in pump chamber, the thread 3 that described screw rotor comprises rotating shaft 2 and is fixedly connected with rotating shaft 2, described thread 3 comprises several and is placed on screw thread gear piece 31 outside axle sleeve, and the surface of contact that described screw thread gear piece 31 abuts with rotating shaft 2 is provided with card convex 32, described rotating shaft 2 is provided with the draw-in groove 21 matched with card convex 32, and card convex 32 snaps in draw-in groove 21; Screw thread gear piece 31 is spliced into continuous print thread 3; The curved angle of described screw thread gear piece 31 is less than 45 degree; The pitch of described thread is: L=l × (1+ka).
Thread on traditional screw rotor is resolved into multiple screw thread gear piece 31 by the technical program, when mounted, is snapped onto by screw thread gear piece 31 successively on corresponding draw-in groove 21; Because screw thread gear piece 31 is provided with card convex 32, therefore its inside radius is less than outer screw diameter, snaps onto in the draw-in groove 21 of screw rod for convenience of screw thread gear piece 31, and what arranged by the curved angle of screw thread gear piece 31 is less than 45 degree; Here curved angle mainly refers to: the arc angle corresponding to the arc-shaped projection of screw thread gear piece 31.Here pitch refers to: the distance on thread between certain point and this rear respective point; The angle of swing of thread starting point is the pitch that 0 π, l represent thread starting point, and a represents the angle of swing of thread, and k is accommodation coefficient, as angle of swing be π time, pitch is; L=l × (1+k π); For ensureing that screw vacuum pump has a good compression ratio, k=0.0001-0.5; Preferably, k=0.25.
Further, sealant layer is provided with between described card convex 32 and draw-in groove 21.
After snapping in draw-in groove 21, between card convex 32 and draw-in groove 21, may gap be there is in card convex 32; In vacuum pump, if there is gap, degree of vacuum will certainly be had influence on; Therefore sealant layer is set between card convex 32 and draw-in groove 21.
Further, sealant layer is provided with between two adjacent screw thread gear pieces 31.
There is certain gap when assembling between adjacent screw thread gear piece 31, being harmful gap to gap, for eliminating this gap, the password hair jelly layer of filling is set in gap.
Further, as shown in Figure 4, Figure 5; In two adjacent screw thread gear pieces 31, one of them screw thread gear piece 31 is provided with in joint and connects projection 33, and another screw thread gear piece 31 is provided with the hole clipping 34 matched with projection 33 in joint.
For convenience of being coupled together by adjacent two screw thread gear pieces 31, adopt the mode of clamping here; Structure is simple, enforcement is convenient.
Below be only the preferred embodiment of the application, equivalent technical solutions on this basis still falls into application protection domain.
Claims (4)
1. a variable pitch screw vacuum pump, comprise the pump housing, pump chamber is provided with in the pump housing, one group of screw rotor is installed in pump chamber, it is characterized in that: the thread that described screw rotor comprises rotating shaft and is fixedly connected with rotating shaft, described thread comprises several and is placed on screw thread gear piece outside axle sleeve, and the surface of contact that described screw thread gear piece abuts with rotating shaft is provided with card convex, described rotating shaft is provided with the draw-in groove matched with card convex, and card convex snaps in draw-in groove; Screw thread gear piece is spliced into continuous print thread, and the curved angle of described screw thread gear piece is less than 45 degree; The pitch of described thread is: L=l × (1+ka); L represents the pitch of thread starting point, and a represents the angle of swing of thread, and k is accommodation coefficient.
2. a kind of variable pitch screw vacuum pump according to claim 1, is characterized in that: be provided with sealant layer between described card convex and draw-in groove.
3. a kind of variable pitch screw vacuum pump according to claim 1, is characterized in that: be provided with sealant layer between two adjacent screw thread gear pieces.
4. a kind of variable pitch screw vacuum pump according to claim 1 or 2 or 3, it is characterized in that: in two adjacent screw thread gear pieces, one of them screw thread gear piece is provided with connection projection in joint, and another screw thread gear piece is provided with the hole clipping matched with projection in joint.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420493661.8U CN204239240U (en) | 2014-08-29 | 2014-08-29 | A kind of variable pitch screw vacuum pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420493661.8U CN204239240U (en) | 2014-08-29 | 2014-08-29 | A kind of variable pitch screw vacuum pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204239240U true CN204239240U (en) | 2015-04-01 |
Family
ID=52768744
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420493661.8U Expired - Fee Related CN204239240U (en) | 2014-08-29 | 2014-08-29 | A kind of variable pitch screw vacuum pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204239240U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112413388A (en) * | 2019-08-20 | 2021-02-26 | 刘大银 | Composite screw |
-
2014
- 2014-08-29 CN CN201420493661.8U patent/CN204239240U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112413388A (en) * | 2019-08-20 | 2021-02-26 | 刘大银 | Composite screw |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150401 Termination date: 20170829 |