CN201412337Y - Back-pressure balanced adjustable minimum pressure valve of screw compressor - Google Patents
Back-pressure balanced adjustable minimum pressure valve of screw compressor Download PDFInfo
- Publication number
- CN201412337Y CN201412337Y CN2009201209771U CN200920120977U CN201412337Y CN 201412337 Y CN201412337 Y CN 201412337Y CN 2009201209771 U CN2009201209771 U CN 2009201209771U CN 200920120977 U CN200920120977 U CN 200920120977U CN 201412337 Y CN201412337 Y CN 201412337Y
- Authority
- CN
- China
- Prior art keywords
- piston
- valve
- pressure
- minimum pressure
- pilot valve
- Prior art date
- 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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Abstract
The utility model relates to a pressure valve, and especially relates to a minimum pressure vale of a screw compressor, in particular to a back-pressure balanced adjustable minimum pressure valve capable of adjusting critical pressure when the valve is opened. The back-pressure balanced adjustable minimum pressure valve comprises a valve body, wherein the valve body is equipped with an air inlet and an air outlet which are mutually perpendicular, one end of a piston cylinder coaxial with the air outlet is located inside the valve body, a piston is engaged inside the piston cylinder, the frontend of the piston corresponds to a position between the air inlet and the air outlet, a counter bore is formed at the front end of the piston, a handle portion of a pilot valve is slidably engaged inside the counter bore of the front end of the piston, a compression spring is arranged between the bottom portion of the counter bore and the end portion of the handle portion of the pilot valve, a sealing surface engaged with the pilot valve is formed inside a position of the valve body corresponding to the pilot valve, the rear end of the piston cylinder is equipped with a spinning cover which isin threaded engagement with the inner wall of the piston, and an adjustable spring is arranged between the inner end of the spinning cover and the rear end of the piston.
Description
Technical field
The utility model relates to a kind of pressure valve, especially a kind of helical-lobe compressor minimum pressure valve, the back-pressure balance formula minimum pressure valve of the critical pressure when specifically a kind of adjustable valve is opened.
Technical background
Minimum pressure valve (have another name called and keep valve) is one of essential critical component of fuel injection helical lobe compressor, it is mounted in the vitals between compressor oil gas separating device and the user's pipe network, the pressure major part that mainly acts on the piston is come balance by the gas pressure in the back pressure cavity, make on the piston and spring can the less spring of preferred dimension, the volume of whole valve is reduced, assembling and debugging are easily, spring vibration reduces, the pulsating nature that gas is produced is little, the sensitivity of valve, open and shut characteristic are good, improve the working life of spring and the life-span of whole valve.In the using process of reality, find, because the critical pressure of different user during to the opening of pressure valve requires different; In addition, certainly exist error, also can bring error the critical pressure that pressure valve is opened as the manufacturing of spring; Simultaneously, can not satisfy the pressure valve high-precision requirement.
Summary of the invention
The utility model purpose is to provide a kind of back-pressure balance formula minimum pressure valve of adjusting the critical pressure when opening, critical pressure when having solved that prior art exists because different user to the opening of pressure valve requires different, the manufacturing of spring certainly exists error, also can bring error, can not satisfy problems such as pressure valve high-precision requirement simultaneously the critical pressure that pressure valve is opened.
Above-mentioned technical purpose of the present utility model mainly solves by the following technical programs: it comprises valve body, valve body is provided with orthogonal suction port and air outlet, piston cylinder one end coaxial with the air outlet is positioned at valve body, be combined with piston in the piston cylinder, the front end of piston is corresponding between suction port and the air outlet, front end at piston is formed with counterbore, the shank of pilot valve is slidingly fitted in the counterbore of piston nose, be provided with pressure spring between the end of the bottom of counterbore and pilot valve shank, position corresponding to pilot valve in the valve body is formed with the sealing surface that cooperates with pilot valve, described piston cylinder rear end is provided with the spinning lid of inner thread cooperation with it, is provided with adjustable spring between described spinning lid the inner and the piston rear end.The utility model is by rotating the spinning lid, and both adjustable springs acted on the power on the pilot valve, thereby adjusted the critical pressure when opening, and it is simple in structure, low cost of manufacture.
As preferably, described piston rear end forms down cavity, is formed centrally boss in the described cavity down, and the inner of described spinning lid is formed with cavity, and the lower end of described adjustable spring is enclosed within down outside the boss of cavity, and the upper end of adjustable spring is positioned at the last cavity that spinning covers.Wherein, by cavity in cavity under forming at piston rear end and the inner formation of spinning lid, made full use of the structure of piston and spinning lid, one side can be beneficial to the setting and the location of adjustable spring, can make that on the other hand structure of the present utility model is more compact, weight is lighter.
As preferably, be provided with lock screw radially between the barrel of described spinning lid and piston cylinder, thereby guarantee the stability of adjustable spring after adjusting, the stability of the critical pressure when opening with assurance.
As preferably, described piston outer wall is arranged with O RunddichtringO and piston cylinder inner wall sealing.
As preferably, described piston counterbore inwall is embedded with metallic sheath, has improved the guidance quality of counterbore to pilot valve on the one hand, has improved the reliability that seals between pilot valve and the valve body sealing surface, piston can be adopted the nonmetallic material manufacturing on the other hand, to reduce manufacture cost of the present utility model.
As preferably, the front end of described piston is formed with annular protrusion, and described annular protrusion contacts with the upper-end surface of pilot valve, thereby can reduce the area of contact of piston nose and pilot valve upper-end surface, to guarantee that piston nose is pressed on pilot valve on the sealing surface of valve body.
Therefore, the utlity model has the critical pressure that can adjust when opening, simple in structure, characteristics such as low cost of manufacture.
Description of drawings
Fig. 1 is a kind of structural representation of the present utility model.
Embodiment
Below by embodiment, and in conjunction with the accompanying drawings, the technical solution of the utility model is described in further detail.
Embodiment 1: as shown in Figure 1, valve body 1 is provided with orthogonal suction port 7 and air outlet 8, and piston cylinder 4 one ends coaxial with air outlet 8 are positioned at valve body 1, and piston outer wall is arranged with O RunddichtringO 18 and piston cylinder inner wall sealing.Be combined with piston 3 in the piston cylinder 4, the front end of piston 3 is corresponding between suction port 7 and the air outlet 8, front end at piston 3 is formed with counterbore 9, counterbore 9 inwalls are embedded with metallic sheath 10, the shank 11 of pilot valve 2 is slidingly fitted in the center hole of the metallic sheath 10 in the counterbore, be provided with pressure spring 12 between the end of the bottom of counterbore 9 and pilot valve shank 11, the front end of piston 3 is formed with annular protrusion 19, and annular protrusion 19 contacts with the upper-end surface of pilot valve 2.Position corresponding to pilot valve 2 in the valve body 1 is formed with the sealing surface 13 that cooperates with pilot valve, piston cylinder 4 rear ends are provided with the spinning lid 5 of inner thread cooperation with it, be provided with lock screw 17 radially between the barrel of spinning lid 5 and piston cylinder 4, piston 3 rear ends form down cavity 14, be formed centrally boss 15 in the following cavity 14, the inner of spinning lid 5 is formed with cavity 16, and the lower end of adjustable spring 6 is enclosed within down outside the boss 15 of cavity 14, and the upper end of adjustable spring 16 is positioned at the last cavity 16 of spinning lid.
Claims (6)
1, the adjustable minimum pressure valve of a kind of back-pressure balance formula helical-lobe compressor, comprise valve body, valve body is provided with orthogonal suction port and air outlet, piston cylinder one end coaxial with the air outlet is positioned at valve body, be combined with piston in the piston cylinder, the front end of piston is corresponding between suction port and the air outlet, front end at piston is formed with counterbore, the shank of pilot valve is slidingly fitted in the counterbore of piston nose, be provided with pressure spring between the end of the bottom of counterbore and pilot valve shank, position corresponding to pilot valve in the valve body is formed with the sealing surface that cooperates with pilot valve, it is characterized in that: described piston cylinder rear end is provided with the spinning lid of inner thread cooperation with it, is provided with adjustable spring between described spinning lid the inner and the piston rear end.
2, the adjustable minimum pressure valve of back-pressure balance formula helical-lobe compressor according to claim 1, it is characterized in that described piston rear end forms down cavity, be formed centrally boss in the described cavity down, the inner of described spinning lid is formed with cavity, the lower end of described adjustable spring is enclosed within down outside the boss of cavity, and the upper end of adjustable spring is positioned at the last cavity of spinning lid.
3, the adjustable minimum pressure valve of back-pressure balance formula helical-lobe compressor according to claim 1 and 2 is characterized in that being provided with between the barrel of described spinning lid and piston cylinder lock screw radially.
4, the adjustable minimum pressure valve of back-pressure balance formula helical-lobe compressor according to claim 1 and 2 is characterized in that described piston outer wall is arranged with O RunddichtringO and piston cylinder inner wall sealing.
5, the adjustable minimum pressure valve of back-pressure balance formula helical-lobe compressor according to claim 1 and 2 is characterized in that described piston counterbore inwall is embedded with metallic sheath.
6, the adjustable minimum pressure valve of back-pressure balance formula helical-lobe compressor according to claim 1 and 2 is characterized in that the front end of described piston is formed with annular protrusion, and described annular protrusion contacts with the upper-end surface of pilot valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201209771U CN201412337Y (en) | 2009-06-01 | 2009-06-01 | Back-pressure balanced adjustable minimum pressure valve of screw compressor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201209771U CN201412337Y (en) | 2009-06-01 | 2009-06-01 | Back-pressure balanced adjustable minimum pressure valve of screw compressor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201412337Y true CN201412337Y (en) | 2010-02-24 |
Family
ID=41714221
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009201209771U Expired - Fee Related CN201412337Y (en) | 2009-06-01 | 2009-06-01 | Back-pressure balanced adjustable minimum pressure valve of screw compressor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201412337Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107208642A (en) * | 2015-01-15 | 2017-09-26 | 阿特拉斯·科普柯空气动力股份有限公司 | Inlet valve and the vavuum pump with this inlet valve |
-
2009
- 2009-06-01 CN CN2009201209771U patent/CN201412337Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107208642A (en) * | 2015-01-15 | 2017-09-26 | 阿特拉斯·科普柯空气动力股份有限公司 | Inlet valve and the vavuum pump with this inlet valve |
| CN107208642B (en) * | 2015-01-15 | 2019-12-31 | 阿特拉斯·科普柯空气动力股份有限公司 | Inlet valve and vacuum pump having such an inlet valve |
| US10619637B2 (en) | 2015-01-15 | 2020-04-14 | Atlas Copco Airpower, Naamloze Vennootschap | Inlet valve and vacuum pump provided with such an inlet valve |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: SHANGHAI GAIRS MACHINERY CO., LTD. Free format text: FORMER OWNER: ZHU MENGJUN Effective date: 20101125 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 325604 (ZHEJIANG YUEYAN COMPRESSOR CO., LTD.), JINGSANWEI ROAD 6, CENTER INDUSTRIAL PARK, YUEQING CITY, ZHEJIANG PROVINCE TO: 201617 NO.388, TANGMING ROAD, SHIHUDANG INDUSTRIAL ZONE, SONGJIANG DISTRICT, SHANGHAI |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20101125 Address after: 201617 Shanghai Songjiang District Shihudang Industrial Zone No. 388 humin Road Patentee after: SHANGHAI GAIRS MACHINERY CO., LTD. Address before: 325604, Yueqing City Industrial Center, Zhejiang, three weft six road (Zhejiang Yue Yan Compressor Co., Ltd.) Patentee before: Zhu Mengjun |
|
| 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: 20100224 Termination date: 20170601 |