CN202911730U - Ejector rod type mechanical control air valve differential pressure compensate mechanism - Google Patents
Ejector rod type mechanical control air valve differential pressure compensate mechanism Download PDFInfo
- Publication number
- CN202911730U CN202911730U CN 201220604130 CN201220604130U CN202911730U CN 202911730 U CN202911730 U CN 202911730U CN 201220604130 CN201220604130 CN 201220604130 CN 201220604130 U CN201220604130 U CN 201220604130U CN 202911730 U CN202911730 U CN 202911730U
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- valve
- cavity
- valve core
- spool
- balanced
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Abstract
The utility model relates to an air valve mechanism, in particular to an ejector rod type mechanical control air valve differential pressure compensate mechanism which comprises a valve body, a valve core, a spring, an upper air cavity and a lower air cavity communicated with the upper air cavity through a valve opening. The upper end of the valve core is formed to be a balanced cavity, one end of the spring is fixed on the valve body, the other end of the spring abuts against the upper end of the valve core through the balanced cavity, a valve core small hole is arranged in the valve core, and the upper air cavity and the lower air cavity are respectively communicated with the balanced cavity through the valve core small hole. When compressed air just enters into the lower air cavity, gas in the lower cavity rapidly enters in to the balanced cavity through the valve core small hole and forms pressure force in different directions with the lower air cavity so that reliable closing force of the valve opening can be kept and reliable sealing of the valve opening can be ensured. When the valve core is pushed to move upwards, the valve opening is opened, the compressed air in the balanced cavity enters into the upper air cavity again and is exhausted from an exhaust port, the pressure force in the balanced cavity disappears, the valve core is pushed just by overcoming elasticity of the spring, and operation force is greatly reduced.
Description
Technical field
The utility model relates to a kind of valve train, is specially a kind of post rod type machinery and controls air valve pressure difference compensation mechanism.
Background technology
At present, various types of air valves are widely used in the controller system of railway locomotive (containing light rail) on the market.Existing universal control method is by controller output electrical signals when the emergency braking, by the braking of promptly leaking informaton of electric signal control electromagnetic valve.But this master mode is under power down mode, and locomotive is with get out of hand, and consequence is hardly imaginable.And the air valve that the large flow of large latus rectum, little oad, little operating effort, little stroke structure are seldom arranged in the market.In view of the foregoing, need to improve existing equipment at present.
The utility model content
For the shortcoming of above-mentioned prior art, the utility model provides a kind of not only sealing reliable, and needs the less post rod type machinery control air valve pressure difference compensation mechanism of operating effort.
The utility model solves the problems of the technologies described above by the following technical solutions:
A kind of post rod type machinery is controlled air valve pressure difference compensation mechanism, comprise valve body, spool, spring, upper gas chamber and the lower air chamber that communicates with upper gas chamber by valve port, described spool upper end moulding one counter balance pocket, described spring one end is fixed on the valve body, and the other end is resisted against the spool upper end through counter balance pocket; Described spool is provided with the spool aperture, and described upper gas chamber communicates with counter balance pocket by the spool aperture respectively with lower air chamber.
As preferably, be covered on the described valve port on the described spool.
The utility model compared with prior art has following advantage: described post rod type machinery is controlled air valve pressure difference compensation mechanism and has been adopted the poor compensation braking air valve of straight dynamic pressure, because the spool of this air valve upper end forms counter balance pocket, after pressurized air just enters lower air chamber, gas in the lower air chamber enters counter balance pocket through the spool aperture rapidly, form one and the rightabout atmospheric pressure of lower air chamber, make valve port keep failure-free to close power, guarantee valve port energy positiver sealing; When promoting the spool upward movement, valve port is opened, and the pressurized air in the counter balance pocket can enter again upper gas chamber and discharge from exhausr port, and the atmospheric pressure in the counter balance pocket disappears, and gets final product and promote the elastic force that spool only need overcome spring, can greatly reduce operating effort.
Description of drawings
Fig. 1 is the cross-sectional schematic of the utility model optimal way.
Fig. 2 is the side cross-sectional schematic of Fig. 1.
The specific embodiment
For technological means, creation characteristic that the utility model is realized, reach purpose and effect is easy to understand, below in conjunction with concrete diagram, further set forth the utility model.
As illustrated in fig. 1 and 2, air valve pressure difference compensation of the present invention mechanism comprises valve body 1, is arranged on spool 2, spring 3, the upper gas chamber 4 that communicates with air extractor duct 41 on the valve body and the lower air chamber 5 that communicates with upper gas chamber by valve port 11, this lower air chamber 5 communicates with admission port 51, described spool upper end moulding one counter balance pocket 6, described spring 3 one ends are fixed on the valve body, and the other end is resisted against the spool upper end through counter balance pocket; Described spool 2 is provided with spool aperture 21, and described upper gas chamber communicates with counter balance pocket by the spool aperture respectively with lower air chamber.
Working process of the present utility model is such: admission port is communicated with the reservoir of controller, and the upper gas chamber among the utility model Fig. 1 and lower air chamber are off conditions, namely close between admission port and the air extractor duct.When spool is subject to the thrust of cam and when overcoming the elastic force upward movement of spring, because the spool upper end is covered on the described valve port, the spool upper end is away from valve port, thereby lower air chamber is communicated with; At this moment, the pressurized air in the reservoir enters lower air chamber from admission port, and enters upper gas chamber through valve port, is discharged to the atmosphere from air extractor duct at last, makes the rapid pressure release of reservoir, thereby makes locomotive begin braking.In this process, the stroke of spool upward movement is larger, and the valve port flow is larger, and the pressure drop of reservoir is faster, and the effect of braking is more obvious.
In the utility model, after pressurized air just entered lower air chamber, the gas in the lower air chamber entered counter balance pocket through the spool aperture rapidly, formed one and the rightabout atmospheric pressure of lower air chamber, made valve port keep failure-free to close power, guaranteed valve port energy positiver sealing; When promoting the spool upward movement, valve port is opened, and the pressurized air in the counter balance pocket can enter again upper gas chamber and discharge from exhausr port, and the atmospheric pressure in the counter balance pocket disappears, and gets final product and promote the elastic force that spool only need overcome spring, can greatly reduce operating effort.
The mechanical opener of general pneumatic valve is that upper lower air chamber exists than bar pressure or elastic force effect, so that mechanism or close reliably or requires the operating effort opened larger.And Direct Action Type pressure difference compensation of the present utility model mechanism can either guarantee the valve port positiver sealing, can only need less operating effort again when opening valve port.
More than show and described groundwork of the present utility model and principal character and advantage of the present utility model; the technical personnel of the industry should be understood; the utility model is not restricted to the described embodiments; that describes in above-described embodiment and the specification sheets just illustrates principle of the present utility model; under the prerequisite that does not break away from the utility model spirit and scope; the utility model also has various changes and modifications; these changes and improvements all fall in claimed the utility model scope, and the claimed scope of the utility model is defined by appending claims and equivalent thereof.
Claims (2)
1. a post rod type machinery is controlled air valve pressure difference compensation mechanism, comprise valve body, spool, spring, upper gas chamber and the lower air chamber that communicates with upper gas chamber by valve port, it is characterized in that: described spool upper end moulding one counter balance pocket, described spring one end is fixed on the valve body, and the other end is resisted against the spool upper end through counter balance pocket; Described spool is provided with the spool aperture, and described upper gas chamber communicates with counter balance pocket by the spool aperture respectively with lower air chamber.
2. a kind of post rod type machinery according to claim 1 is controlled air valve pressure difference compensation mechanism, it is characterized in that: described spool upper end is covered on the described valve port.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220604130 CN202911730U (en) | 2012-11-15 | 2012-11-15 | Ejector rod type mechanical control air valve differential pressure compensate mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220604130 CN202911730U (en) | 2012-11-15 | 2012-11-15 | Ejector rod type mechanical control air valve differential pressure compensate mechanism |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202911730U true CN202911730U (en) | 2013-05-01 |
Family
ID=48160065
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220604130 Expired - Lifetime CN202911730U (en) | 2012-11-15 | 2012-11-15 | Ejector rod type mechanical control air valve differential pressure compensate mechanism |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202911730U (en) |
-
2012
- 2012-11-15 CN CN 201220604130 patent/CN202911730U/en not_active Expired - Lifetime
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130501 |
|
| CX01 | Expiry of patent term |