CN201372980Y - Pneumatic reversing valve - Google Patents
Pneumatic reversing valve Download PDFInfo
- Publication number
- CN201372980Y CN201372980Y CN200920051519U CN200920051519U CN201372980Y CN 201372980 Y CN201372980 Y CN 201372980Y CN 200920051519 U CN200920051519 U CN 200920051519U CN 200920051519 U CN200920051519 U CN 200920051519U CN 201372980 Y CN201372980 Y CN 201372980Y
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- valve rod
- valve
- piston
- small piston
- big
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- Expired - Fee Related
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Abstract
The utility model discloses a pneumatic reversing valve which comprises a valve body and a valve rod which is arranged in the valve body and used for reciprocating motion. A small piston and a big piston are respectively arranged at two ends of the valve rod; a corresponding small piston cavity and a big piston cavity are formed on the valve body; and a channel for communicating with a space on one side where the small piston in the small piston cavity is connected with the valve rod and a space on one side where the big piston in the big piston cavity is connected with the valve rod during the reciprocating motion of the valve rod is formed on the valve body. Through causing the gas exchange channel of the piston cavity in the pneumatic reversing valve to be built in, an opening formed on the end cover of the valve body and used for gas exchange with outside atmosphere is eliminated. When the control gas circuit of the reversing valve is opened, gas pressure acts on the big piston, the free air in the big piston cavity enters the small piston cavity through an internal channel at the moment, and then the exchange of the free air in the small piston cavity and the big piston cavity is finished. Therefore, the respiratory exchange of the piston cavity in the reversing valve can be finished through the internal channel without gas exchange with the outside atmosphere, thereby completely solving the dust prevention problem of the prior pneumatic reversing valve.
Description
Technical field
The utility model relates to the pneumatics field, particularly a kind of air operated reversing valve of automatically controlled or gas control.
Background technique
In pneumatic system, be used to change the disconnected state of pressurized air flow direction and air communication, make the action of pneumatic element or control that state changes be called direction control.The pneumatic element of realizing such control is called air operated reversing valve (position control valve).Air operated reversing valve divides electric control reversing valve and Pneumatic reversal valve, and using the widest is electric control reversing valve, accounts for more than 90%.
Existing air operated reversing valve as shown in Figure 1, comprise valve body, be arranged on reciprocating valve rod in the valve body, the two ends of valve rod have small piston and big piston respectively, valve body is provided with corresponding small piston chamber and big piston chamber, is distributed with the gas exchange opening that is interconnected with corresponding small piston chamber and big piston chamber on the front and rear cover of valve body.Air operated reversing valve is when the commutation action, and big or small piston cavity is carried out gas exchange by opening on the valve end cap and ambient atmosphere respectively, is not communicated with between the big or small piston cavity.Therefore, when valve is done the commutation action, can suck the dust of surrounding environment, a dust part that sucks accumulates on the slidingsurface of piston and end cap endoporus, another part is brought into around the slip surface of valve body and stem guiding along with valve rod, can accelerate the wearing and tearing of piston packing and slip surface, serious causes moving element stuck, influences functional reliability and life of product.Therefore existing air operated reversing valve functional reliability under dust atmosphere is low, the rate of fault height, and life of product is short.Be not suitable for dust occasions such as road building machine, woodworking machinery, cement.
In the prior art, for preventing the suction of dust, opening or other position at the valve end cap adopt foam fibre to come Chalk-dust filtering, this scheme has obvious defects, in order to improve filter precision and dustproof effect, must improve the fiber order number in the unit area, then the resistance of gas exchange becomes big in the piston cavity, speed is slack-off, thereby influences commutating frequency, the speed of air operated reversing valve; After using certain hour simultaneously, clean or change inconvenient operation.
The model utility content
The technical problems to be solved in the utility model is to overcome the deficiencies in the prior art, and a kind of novel air operated reversing valve is provided, and solves the dustproof problem of air operated reversing valve, when preventing dust sucker chamber, does not influence the commutating frequency and the speed of air operated reversing valve.
The realization the technical solution of the utility model is: a kind of air operated reversing valve, comprise valve body, be arranged on reciprocating valve rod in the valve body, the two ends of valve rod have small piston and big piston respectively, valve body is provided with corresponding small piston chamber and big piston chamber, it is characterized in that: described valve rod is provided with in valve rod to-and-fro motion process, is communicated with link to each other with the valve rod passage in a side space of big piston in a side space and the big piston chamber that links to each other with valve rod of small piston in the small piston chamber.
Described passage comprises and is arranged on the axially extended main passage of valve rod, valve rod upper edge, and is arranged on the subchannel that is interconnected with the main passage on the outer wall at valve rod two ends.
Perhaps described passage comprises and is arranged on the axially extended main passage of valve rod, valve rod upper edge, and be arranged on the subchannel that is interconnected with the main passage on the end face that is connected with valve rod of small piston and big piston, and the subchannel is positioned at outside its zone that is connected with valve rod with opening on the big piston end face at small piston.
Further, described main passage is the through hole that is arranged on the valve rod axial centre.
Further, described subchannel is the groove that is arranged on valve rod both ends of the surface or small piston, big piston end face.
Compared with prior art, air operated reversing valve provided by the utility model is by structural improvement, and the gas exchange passage of air operated reversing valve piston cavity is built-in, and cancellation was arranged on the opening that carries out gas exchange on the valve body end cap with the external world greatly originally.When selector valve does not have control signal, valve rod and large and small position of piston are positioned at original state, when selector valve obtains commutation signal, the control gas circuit of selector valve is opened, gas pressure is on big piston, because there is the area difference of about twice in large and small piston, then the big piston resistance that overcomes small piston promotes valve rod to small piston one lateral movement, and then selector valve commutates.This moment, the free air in big piston chamber was come the respiratory cavity (being the piston cavity space of the side that is connected with valve rod of small piston) in small piston chamber by the inner passage, and then the exchange of the free air of large and small piston cavity is promptly finished.Therefore exchange gas can be finished by the inner passage in the selector valve piston cavity, need not carry out gas exchange with ambient atmosphere.Thereby thoroughly solved the dustproof problem of existing air operated reversing valve, prevented dust sucker chamber, improved the reliability and the working life of air operated reversing valve, enlarged using scope.Also can not influence simultaneously the commutating frequency and the speed of air operated reversing valve.
Description of drawings
Fig. 1: the structural representation of air operated reversing valve in the prior art;
Fig. 2: the structural representation of the utility model air operated reversing valve (valve rod is positioned at original state);
Fig. 3: be the structural representation after the valve rod action once among Fig. 2.
Embodiment
Below in conjunction with the drawings and specific embodiments the utility model air operated reversing valve is further specified.Shown in accompanying drawing 2,3, with the electric control reversing valve is example, it comprises valve body 1, be arranged on reciprocating valve rod 2 in the valve body 1, the two ends of valve rod 2 have small piston 3 and big piston 5 respectively, valve body 1 is provided with corresponding small piston chamber 4 and big piston chamber 6 (the piston respiratory cavity is in main be connected with valve rod 2 space of a side of small piston 3 in the finger small piston chamber 4 in the present embodiment, and be connected with valve rod 2 space of a side of big piston 5 in the big piston chamber 6 again).In the present embodiment, cancelled the opening that carries out air exchange in small piston chamber 4 and the big piston chamber 6 with the external world, and should be for built-in with this air exchange.Its changing channel by: big piston chamber 6, valve rod 2 both ends of the surface grooves 22,23, stem through-hole 21 and small piston chamber 4 are formed.Be two smooth plane engagement between the forward and backward end cap 13,12 of valve body and the valve body 1.Its specific practice is: make a call to a through hole 21 at valve rod 2 centers, simultaneously at 2 liang of end mill grooves of valve rod 22,23, valve rod 2 middle through holes 21 are communicated with groove 22,23, the free air of then large and small piston cavity 6,4 is by this inner passage, gas exchange is carried out in 6,4 inside in the two-piston chamber, no longer carries out gas exchange through extraneous with large and small piston cavity 6,4.
When electric control reversing valve does not have automatically controlled signal, the position of valve rod 2 and large and small piston 5,3 as shown in Figure 2, when electric control reversing valve is given electrical signal, the control gas circuit of selector valve inside is opened, gas pressure is on big piston 5, because there is the area difference of about twice in large and small piston 5,3, then big piston 5 overcomes the resistance promotion valve rod 2 of small piston 3 to left movement, then selector valve commutation, as shown in Figure 3.The groove 21 of the groove 23 of big piston chamber 6 free air this moment by valve rod 2 end faces, valve rod central through bore 21, valve rod 2 other ends, to small piston chamber 4, the exchange of the free air of then large and small piston cavity 5,3 is promptly finished.As seen the respiratory exchange of its gas can be finished by the inner passage, need not carry out gas exchange with ambient atmosphere.Solve the dust control technology problem of air operated reversing valve, widened the using scope of pneumatic valve.
In addition, be arranged on the groove 22,23 of valve rod 2 end faces, also can be that opening is arranged on valve rod 2 walls or the passage on the piston end surface, or be arranged on the groove of piston end surface, be communicated with large and small piston cavity 6,4 internally as long as can satisfy in a word.
Claims (5)
1, a kind of air operated reversing valve, comprise valve body (1), be arranged on reciprocating valve rod (2) in the valve body (1), the two ends of valve rod (2) have small piston (3) and big piston (5) respectively, valve body (1) is provided with corresponding small piston chamber (4) and big piston chamber (6), it is characterized in that: described valve rod is provided with in valve rod to-and-fro motion process, is communicated with link to each other with valve rod (2) passage in a side space of a side space and big piston chamber (6) middle big piston (5) that links to each other with valve rod (2) of small piston (3) in the small piston chamber (4).
2, air operated reversing valve according to claim 1 is characterized in that: described passage comprises and is arranged on the axially extended main passage of valve rod (2) upper edge valve rod (2), and is arranged on the subchannel that is interconnected with the main passage on the outer wall at valve rod (2) two ends.
3, air operated reversing valve according to claim 1, it is characterized in that: described passage comprises and is arranged on the axially extended main passage of valve rod (2) upper edge valve rod (2), and be arranged on the subchannel that is interconnected with the main passage on the end face that is connected with valve rod of small piston (3) and big piston (5), and being positioned at outside its zone that is connected with valve rod with opening on big piston (5) end face of subchannel at small piston (3).
4, according to claim 2 or 3 described air operated reversing valves, it is characterized in that: described main passage is the through hole (21) that is arranged on the valve rod axial centre.
5, air operated reversing valve according to claim 4 is characterized in that: described subchannel is for being arranged on the groove of valve rod (2) both ends of the surface or small piston (3), big piston (5) end face.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920051519U CN201372980Y (en) | 2009-02-17 | 2009-02-17 | Pneumatic reversing valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920051519U CN201372980Y (en) | 2009-02-17 | 2009-02-17 | Pneumatic reversing valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201372980Y true CN201372980Y (en) | 2009-12-30 |
Family
ID=41499064
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200920051519U Expired - Fee Related CN201372980Y (en) | 2009-02-17 | 2009-02-17 | Pneumatic reversing valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201372980Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102261492A (en) * | 2011-04-28 | 2011-11-30 | 肇庆市志成气动有限公司 | Electric control reversing valve |
| CN104390032A (en) * | 2014-11-21 | 2015-03-04 | 宁波飞泰工业自控设备有限公司 | Pneumatic type electromagnetic valve |
| CN106194710A (en) * | 2016-08-29 | 2016-12-07 | 重庆水泵厂有限责任公司 | Membrane pump multifunctional exhaust valve |
| CN107676321A (en) * | 2017-09-20 | 2018-02-09 | 上海空间推进研究所 | A kind of inside reversal valve for pneumatic booster |
-
2009
- 2009-02-17 CN CN200920051519U patent/CN201372980Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102261492A (en) * | 2011-04-28 | 2011-11-30 | 肇庆市志成气动有限公司 | Electric control reversing valve |
| CN104390032A (en) * | 2014-11-21 | 2015-03-04 | 宁波飞泰工业自控设备有限公司 | Pneumatic type electromagnetic valve |
| CN106194710A (en) * | 2016-08-29 | 2016-12-07 | 重庆水泵厂有限责任公司 | Membrane pump multifunctional exhaust valve |
| CN106194710B (en) * | 2016-08-29 | 2018-01-05 | 重庆水泵厂有限责任公司 | Membrane pump multifunctional exhaust valve |
| CN107676321A (en) * | 2017-09-20 | 2018-02-09 | 上海空间推进研究所 | A kind of inside reversal valve for pneumatic booster |
| CN107676321B (en) * | 2017-09-20 | 2019-07-05 | 上海空间推进研究所 | A kind of inside reversal valve for pneumatic booster |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20091230 Termination date: 20130217 |