CN1140710C - Screw bolt with new type of profile - Google Patents
Screw bolt with new type of profile Download PDFInfo
- Publication number
- CN1140710C CN1140710C CNB01107485XA CN01107485A CN1140710C CN 1140710 C CN1140710 C CN 1140710C CN B01107485X A CNB01107485X A CN B01107485XA CN 01107485 A CN01107485 A CN 01107485A CN 1140710 C CN1140710 C CN 1140710C
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- China
- Prior art keywords
- screw
- tooth
- present
- cycloid
- curve
- Prior art date
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- Expired - Fee Related
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- 238000007789 sealing Methods 0.000 description 8
- 241001661918 Bartonia Species 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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Abstract
The present invention relates to a novel dentiform screw which is used for a two-screw pump or a two-screw compressor. Cycloids and cycloidal envelopes which use the cycloids as the baseline are used for replacing involutes, an Archimedes spiral or circular arc curve segments of an original dentiform screw. Thus, when the present invention is used for the two-screw pump or the two-screw compressor, strict (complete) seal can be achieved, and the interference phenomenon can not occur. The present invention has the advantages of high volumetric efficiency, simplicity, practicability and good application effect; the novel dentiform screw is composed of severalgroups of line segments of two cycloids (B), cycloidal envelopes (B) which use one cycloid as the baseline, screw addendum circles and screw root circles.
Description
Technical field
The present invention is a kind of new screw profile of tooth that is used for two screw pump or double-screw compressor, belongs to the improvement technology of two screw pump or the used screw rod of double-screw compressor.
Background technique
The existing tooth shape of screw that is used for two screw pump, as the involute tooth shape of screw, its tooth curve is to be combined by cycloid, root circle circular arc, top circle circular arc, involute, when this screw rod is used for two screw pump, the shortcoming of its existence is to reach strict (fully) sealing, so volumetric efficiency is not high.
Summary of the invention
The object of the present invention is to provide a kind ofly by changing its tooth curve, seal so that it can reach strict (fully) when being used for two screw pump or double-screw compressor, the volumetric efficiency height can not interfere the tooth screw stem of phenomenon.
Tooth curve of the present invention as shown in drawings, curve abcdefghij is the tooth curve on the screw rod cross section, acg is on a diameter of top circle, a is on top circle, c is on root circle, and on the footpath, d, e are on root circle in the flank of tooth for g, i, j are on top circle, curve abc is a cycloid, and cde is the circular arc of root circle, and ija is the circular arc of top circle, ghi is a cycloid, and efg is to be the cycloid envelope of baseline with ghi line segment (cycloid).
Good effect of the present invention is by changing its tooth curve, is that the cycloid envelope of baseline substitutes curved sections such as original involute or spiral of Archimedes with cycloid and with it.Strict (fully) sealing can be reached when this tooth-shaped screw bolt is used for two screw pump or double-screw compressor, and phenomenon can not be interfered.Be a kind of volumetric efficiency height, simple, practical, the tooth screw stem that effect is good.
Describe concrete structure of the present invention and sealing mechanism thereof in detail below by accompanying drawing.
Description of drawings
Fig. 1 is a tooth curve of the present invention, and abc is a straight-sided flank among the figure, and efghi is a pitch face.
Fig. 2 is the projection drawing of the potted line on the screw rod straight-sided flank on shaft section among Fig. 1.
Fig. 3 is the projection drawing of potted line on shaft section of screw rod pitch face among Fig. 1.
Fig. 4 is the condition diagram of screw rod Seal cage.
Fig. 5 is the shaft section projection drawing of Seal cage among Fig. 4.
Embodiment
Accompanying drawing 1 is a tooth curve of the present invention, and abcdefghij is the tooth curve on the screw rod cross section among the figure, and acg is on a diameter of top circle, a is on top circle, c is on root circle, and on the footpath, d, e are on root circle in the flank of tooth for g, i, j are on top circle, curve abc is a cycloid, and cde is the garden arc of root circle, and ija is the circular arc of top circle, ghi is a cycloid, and efg is to be the cycloid envelope of baseline with the ghi curved section.
The present invention can make left handed screw, also can make right handed screw.
When the present invention was used for two screw pump or double-screw compressor, adjacent screw rod was only in the hand of spiral difference, and its tooth-shape structure is identical.
Sealing mechanism when the present invention is used for two screw pump or double-screw compressor is as follows:
The tooth form according to the invention curve can obtain Fig. 2 and screw tooth surface sealing curve shown in Figure 3, and wherein Fig. 2 is the projection of potted line on shaft section of screw rod straight-sided flank of the present invention, O among the figure
1The potted line of screw rod straight-sided flank is O
2The ac arc that the screw rod toothed crown marks, and O
1The toothed crown of screw rod and O
2Screw tooth surface is same to form a sealing lines a ' c ', and the potted line ac of screw rod straight-sided flank, a ' c ' run through the flank of tooth and housing and O separately
1, O
2Link to each other at the bottom of the screw rod tooth on the line.
Fig. 3 is the projection of potted line on shaft section of screw rod pitch face among Fig. 1, O among the figure
2The flank of tooth bus and the O of screw rod pitch face
1The sealing curve that the tooth root profile of tooth of screw rod pitch face is formed is exactly broken line abg; In like manner, O
1Screw rod pitch face toothed crown and O
2The potted line of screw rod pitch face root edge on the flank of tooth is broken line a ' b ' g, and it is connected to the g point mutually with broken line abg.This shows that the potted line of screw rod pitch face is broken line abgb ' a ', it is through the common flank of tooth of two screw rods, and and O
1, O
2Link to each other at the bottom of the two screw rods tooth on the line.
According to analysis, consider O again to the screw tooth surface potted line
1, O
2Screw rod Topland and tooth bottom surface are mutually tangent and the potted line that forms then can get screw rod Seal cage situation as shown in Figure 4, and the shaft section projection drawing of Seal cage as shown in Figure 5 among Fig. 4.From Fig. 4, Fig. 5 as seen: the hydraulic fluid every grade of screw rod teeth groove is communicated with route and all forms an independent figure of eight closed loop.The existence of this seal ring is confirmed from the actual detected of using two screw pump of the present invention, and it is to satisfy first and second class air-proof condition of screw pump fully.
In sum, as seen, when being used for two screw pump or double-screw compressor, the present invention can reach strict (fully) sealing, so its volumetric efficiency height, and can not interfere phenomenon.
Claims (2)
1. tooth-shaped screw bolt, curve abcdefghij is the tooth curve on the screw rod cross section, a, c, g are on a diameter of top circle, a is on top circle, c is on root circle, and on the footpath, d, e are on root circle in the flank of tooth for g, i, j are on top circle, curve abc is a cycloid, and cde is the circular arc of root circle, and ija is the circular arc of top circle, it is characterized in that ghi is a cycloid, efg is that the ghi curved section is the cycloid envelope of baseline.
2. a kind of tooth-shaped screw bolt according to claim 1 is characterized in that making left handed screw, also can make right handed screw.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB01107485XA CN1140710C (en) | 2001-01-21 | 2001-01-21 | Screw bolt with new type of profile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB01107485XA CN1140710C (en) | 2001-01-21 | 2001-01-21 | Screw bolt with new type of profile |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1299928A CN1299928A (en) | 2001-06-20 |
| CN1140710C true CN1140710C (en) | 2004-03-03 |
Family
ID=4656411
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB01107485XA Expired - Fee Related CN1140710C (en) | 2001-01-21 | 2001-01-21 | Screw bolt with new type of profile |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1140710C (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100432434C (en) * | 2006-09-29 | 2008-11-12 | 中国船舶重工集团公司第七一一研究所 | Noval tooth-type screw rod |
| CN102465871B (en) * | 2010-11-17 | 2014-11-26 | 上海格什特螺杆科技有限公司 | Screw rotor end face tooth type |
| TWI539078B (en) * | 2013-09-06 | 2016-06-21 | 亞台富士精機股份有限公司 | Helix rotor and method for generating tooth thereof |
| CN106194717B (en) * | 2016-08-31 | 2018-03-16 | 浙江威隆机械科技有限公司 | A kind of rubber screw rod molded lines of rotor suitable for spiral displacement pump |
| CN109711098B (en) * | 2019-01-22 | 2023-04-07 | 重庆大学 | Design method of involute arc tooth profile straight bevel gear and gear meshing pair |
-
2001
- 2001-01-21 CN CNB01107485XA patent/CN1140710C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1299928A (en) | 2001-06-20 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| AR01 | Abandonment of patent right to avoid double patenting |
According to article 9 of the patent law and article 13 of the detailed rules for the implementation of the patent law: The invention patent of 01107485.X is authorized in this issue. At the same time, the 1215030.4 utility model patent shall be given up, and the patent right abandonment announcement shall be made on the 20 edition of the 9 edition of the utility model. |
|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |