CN210423863U - Pressure reducer integrating overpressure protection function - Google Patents
Pressure reducer integrating overpressure protection function Download PDFInfo
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- CN210423863U CN210423863U CN201921418866.9U CN201921418866U CN210423863U CN 210423863 U CN210423863 U CN 210423863U CN 201921418866 U CN201921418866 U CN 201921418866U CN 210423863 U CN210423863 U CN 210423863U
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Abstract
The utility model discloses an integrated superpressure protect function's pressure reducer belongs to pressure reducer technical field, including valve body, main valve core, main valve spring, piston, command case, command valve spring, adjusting lever, adjusting spring, adjusting screw, main valve seat, main valve export chamber, main valve backpressure chamber, main valve entry chamber, the passageway of inside ventilating, piston backpressure chamber, command valve export chamber and command valve pocket, adjusting screw installs the top at the outside casing of valve body, main valve entry chamber and command valve pocket are through the passageway intercommunication of inside ventilating, it has seted up the air vent to run through on the main valve core, main valve export chamber and main valve backpressure chamber are linked together through the air vent on the main valve core. The utility model provides a current pressure reducer precision not high to and no superpressure protect function's problem, effectively avoid the low reaches work to appear the damage that probably causes the pressure reducer when unusual, have the characteristics of precision height, safe and reliable.
Description
Technical Field
The utility model relates to a pressure reducer technical field especially relates to a pressure reducer of integrated superpressure protect function.
Background
The pressure reducer is a regulating device which reduces high-pressure gas into low-pressure gas and keeps the pressure and flow of output gas basically stable and unchanged. At present, the pressure reducer is widely applied to industrial high-pressure gas cylinders and pipeline systems, is a necessary accessory for pneumatic regulation, and mainly has the main function of reducing the pressure of a gas source and stabilizing the pressure to a fixed value so as to obtain stable gas source power for regulation and control. The existing pressure reducing valve products can be generally divided into direct-acting type and pilot type, and a throttling element with changeable local resistance is generally arranged, namely, the flow speed and the kinetic energy of fluid are changed by changing the throttling area, so that different pressure losses are caused, and the purpose of reducing pressure is achieved. Then, the fluctuation of the pressure behind the valve is balanced with the spring force by means of the regulation of the control and regulation system, so that the pressure behind the valve is kept constant within a certain error range.
The existing pressure reducer products have lower adjustment precision. When the upstream pressure variation span is large, the downstream pressure fluctuation is large. Moreover, without the overpressure protection function, the pressure reducer may be damaged in case of downstream abnormal operation, so that it is highly desirable to design a pressure reducer integrating the overpressure protection function.
SUMMERY OF THE UTILITY MODEL
The purpose of the utility model is to solve the shortcoming that exists among the prior art, if: the existing pressure reducers have the problems of low precision and no overpressure protection function.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a pressure reducer integrating an overpressure protection function comprises a valve body, a main valve core, a main valve spring, a piston, a command valve core, a command valve spring, an adjusting rod, an adjusting spring, an adjusting screw, a main valve seat, a main valve outlet cavity, a main valve back pressure cavity, a main valve inlet cavity, an internal ventilation channel, a piston back pressure cavity, a command valve outlet cavity and a command valve cavity.
Preferably, threaded connection is adopted between the adjusting screw and the outer shell of the valve body, and the adjusting screw can move up and down relative to the valve body through threaded matching.
Preferably, two piston sealing rings are symmetrically fixedly sleeved on the piston.
Preferably, the top of the adjusting rod is fixedly sleeved with an adjusting rod sealing ring.
Preferably, the overpressure exhaust channel is arranged between the main valve element and the piston for integrating an overpressure protection function of the outlet.
Preferably, the overpressure exhaust passage is of a stepped structure, and the top end portion of the main valve core is located right below the overpressure exhaust passage.
Compared with the prior art, the beneficial effects of the utility model are that:
1. the utility model discloses through the actual measurement, when pressure reducer entry upstream pressure changes at 7 ~ 35MPa pressure range, but exit pressure accurate control is at 5 0.5MPa within range. Meanwhile, the overpressure protection function can effectively avoid the possible damage to the pressure reducer when the downstream work is abnormal;
2. the utility model arranges the command valve to adjust the motion of the piston, and designs the area matching relation of all the air inlet channels, so that the outlet pressure of the pressure reducer has high control precision;
3. the utility model discloses a set up superpressure exhaust passageway, integrated export superpressure protect function between main valve core and piston.
Drawings
Fig. 1 is a schematic structural diagram of a pressure reducer integrated with an overpressure protection function according to the present invention;
fig. 2 is an enlarged view of a structure of fig. 1.
In the figure: the valve comprises a valve body 1, a main valve core 2, a main valve spring 3, a piston 4, a command valve core 5, a command valve spring 6, an adjusting rod 7, an adjusting spring 8, an adjusting screw 9, a piston sealing ring 10, an adjusting rod sealing ring 11, a main valve seat 12, a main valve outlet cavity 13, a main valve back pressure cavity 14, a main valve inlet cavity 15, an internal vent channel 16, a piston back pressure cavity 17, an overpressure exhaust channel 18, a command valve outlet cavity 19 and a command valve cavity 20.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
Referring to fig. 1-2, a pressure reducer with an integrated overpressure protection function comprises a valve body 1, a main valve core 2, a main valve spring 3, a piston 4, a command valve core 5, a command valve spring 6, an adjusting rod 7, an adjusting spring 8, an adjusting screw 9, a main valve seat 12, a main valve outlet cavity 13, a main valve back pressure cavity 14, a main valve inlet cavity 15, an internal vent channel 16, a piston back pressure cavity 17, a command valve outlet cavity 19 and a command valve cavity 20, wherein the adjusting screw 9 is mounted at the top of an outer shell of the valve body 1, the main valve inlet cavity 15 is communicated with the command valve cavity 20 through the internal vent channel 16, a vent hole is formed in the main valve core 2 in a penetrating manner, the main valve outlet cavity 13 is communicated with the main valve back pressure cavity 14 through the vent hole in the main valve core 2, a gas channel is arranged in the valve body 1 at a position close to the command valve spring 6, the valve body 1 is provided with an overpressure exhaust channel 18, the overpressure exhaust channel 18 being located between the main valve element 2 and the piston 4.
It should be noted that the direction of the vent holes is different, the three-dimensional structure scale characteristic of the structure is fully utilized, the adjusting screw 9 can slide up and down relative to the valve body 1, the pressure reducer is normally closed, the main valve element 2 is sealed with the main valve seat 12 under the action of the main valve spring 3 in the initial state, the adjusting rod 7 jacks the command valve element 5 to a certain opening degree under the action of the adjusting spring 8, the opening degree can be adjusted through the up-and-down movement of the adjusting screw 9, and the piston 4 can slide up and down in the valve body 1 to realize the selective closing of the overpressure exhaust passage 18;
the adjusting screw 9 is in threaded connection with the outer shell of the valve body 1, and the adjusting screw 9 can move up and down relative to the valve body 1 through threaded matching;
it should be noted that the adjusting screw 9 is connected with the valve body 1 by screw-thread fit, and the adjusting screw 9 can be rotated to move up and down relative to the valve body 1, so as to adjust the opening between the command valve core 5 and the adjusting rod 7;
wherein, two piston sealing rings 10 are symmetrically and fixedly sleeved on the piston 4;
it should be noted that, the sealing performance of the piston 4 when sliding inside the valve body 1 is ensured by the piston sealing ring 10;
wherein, the top of the adjusting rod 7 is fixedly sleeved with an adjusting rod sealing ring 11;
it should be noted that the sealing performance of the installation position of the adjusting rod 7 is ensured by the adjusting rod sealing ring 11;
wherein an overpressure exhaust channel 18 is provided between main valve element 2 and piston 4 for integrating the overpressure protection function of the outlet;
it should be noted that, when an abnormality occurs downstream of the outlet and the pressure in the main valve outlet chamber 15 becomes ultrahigh, the piston 4 is pushed upward until the piston 4 and the main valve spool 2 are out of contact, and the overpressure exhaust passage 18 is opened, so that the gas in the main valve outlet chamber 15 can be exhausted to the atmosphere through the overpressure exhaust passage 18, and an overpressure protection function is realized. When the downstream pressure returns to normal, the piston 4 moves downwards and contacts the main valve core 2 again, and the overpressure exhaust passage 18 is blocked again;
wherein, the overpressure exhaust channel 18 is of a step-shaped structure, and the top end part of the main valve element 2 is positioned right below the overpressure exhaust channel 18;
it should be noted that when main valve element 2 is in contact with piston 4, overpressure exhaust passage 18 is closed by the portion of the top end of main valve element 2, and when main valve element 2 is disengaged from piston 4, overpressure exhaust passage 18 is vented.
In the utility model, when the user uses the device, the pressure reducer is normally closed, the main valve core 2 is sealed with the main valve seat 12 under the action of the main valve spring 3 in the initial state, the adjusting rod 7 is used for jacking the commanding valve core 5 to a certain opening degree under the action of the adjusting spring 8, and the opening degree can be adjusted by the up-and-down movement of the adjusting screw 9. When the main valve inlet chamber 13 is filled with high pressure, high-pressure gas reaches the command valve chamber 20 through the internal vent passage 16 of the valve body 1, enters the command valve outlet chamber 19 through the opening degree of the command valve, enters the piston back pressure chamber 17 through the gas passage, pushes the piston 4 to move downwards, further pushes the main valve to open, and the gas enters the downstream from the valve outlet. The overpressure vent passage 18 between the piston 4 and the main valve element 2 is blocked and the main valve outlet chamber 13 is not vented.
When the pressure of the main valve inlet cavity 13 rises, the pressure of the commanding valve cavity 20 rises, the commanding valve core 5 is subjected to upward force to move upward by overcoming the loading force of the adjusting spring 8, the opening degree of the commanding valve is reduced, the pressures of the commanding valve outlet cavity 19 and the piston backpressure cavity 17 are reduced, the downward opening force of the piston 4 is reduced, the stress balance is broken, the piston 4 moves upward, the main valve core 2 moves upward along with the upward movement, the opening degree of the main valve is reduced, and the stability of the pressure of the main valve outlet cavity 15 is ensured. On the contrary, when the pressure of the main valve inlet chamber 13 is reduced, the pressure of the command valve chamber 20 is reduced, the command valve core 5 is subjected to an upward force to be reduced, the command valve core moves downwards under the action of the loading force of the adjusting spring 8, the opening degree of the command valve is increased, the pressures of the command valve outlet chamber 19 and the piston back pressure chamber 17 are increased, the downward opening force of the piston 4 is increased, the stress balance is broken, the piston 4 moves downwards, the main valve core 2 moves downwards along with the downward opening degree of the main valve, and the stability of the pressure of the main valve outlet chamber 15 is ensured.
When the outlet downstream is abnormal and the pressure of the main valve outlet cavity 15 is ultrahigh, the piston 4 is pushed upwards until the piston 4 is separated from the main valve core 2, at the moment, the overpressure exhaust passage 18 is opened, and the gas in the main valve outlet cavity 15 can be exhausted into the atmosphere through the overpressure exhaust passage 18, so that the overpressure protection function is realized. When the downstream pressure returns to normal, the piston 4 moves downward and comes back into contact with the main valve element 2, blocking the excess-pressure exhaust channel 18 again.
According to the invention, the plurality of vent holes in different directions are arranged in the valve body 1, so that the three-dimensional structure scale characteristic of the structure is fully utilized, and a plurality of cavities with different pressures are arranged in the valve body. And then the opening of the command valve is used for adjusting the pressure of the piston back pressure cavity 17, so that the opening of the main valve is quickly responded, the area matching relation of all air inlet channels is finely designed, and the outlet pressure of the pressure reducer is high in control precision. Furthermore, an overpressure protection function is achieved by providing an overpressure vent channel 18 between main valve element 2 and piston 4.
The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.
Claims (6)
1. A pressure reducer integrating overpressure protection function comprises a valve body (1), a main valve core (2), a main valve spring (3), a piston (4), a command valve core (5), a command valve spring (6), an adjusting rod (7), an adjusting spring (8), an adjusting screw (9), a main valve seat (12), a main valve outlet cavity (13), a main valve back pressure cavity (14), a main valve inlet cavity (15), an internal vent channel (16), a piston back pressure cavity (17), a command valve outlet cavity (19) and a command valve cavity (20), and is characterized in that the adjusting screw (9) is installed at the top of an external shell of the valve body (1), the main valve inlet cavity (15) and the command valve cavity (20) are communicated through the internal vent channel (16), a vent hole is formed in the main valve core (2) in a penetrating manner, and the main valve outlet cavity (13) and the main valve back pressure cavity (14) are communicated through the vent hole in the main valve core (2), a gas channel is arranged in the valve body (1) close to the position of the command valve spring (6), the command valve outlet cavity (19) is communicated with the piston back pressure cavity (17) through the gas channel, and an overpressure exhaust channel (18) is arranged on the valve body (1).
2. Pressure reducer with integrated overpressure protection function according to claim 1, characterized in that the adjusting screw (9) is in threaded connection with the outer shell of the valve body (1), and the adjusting screw (9) can move up and down relative to the valve body (1) through threaded fit.
3. Pressure reducer with integrated overpressure protection function according to claim 1, characterized in that two piston sealing rings (10) are symmetrically fixed and sleeved on the piston (4).
4. Pressure reducer with integrated overpressure protection function according to claim 1, characterized in that the adjusting rod sealing ring (11) is fixedly sleeved on the top of the adjusting rod (7).
5. Pressure reducer with integrated overpressure protection function according to claim 1, characterized in that the overpressure vent channel (18) is provided between the main spool (2) and the piston (4) for integrating the overpressure protection function of the outlet.
6. Pressure reducer with integrated overpressure protection function according to claim 1, characterized in that the overpressure exhaust channel (18) is of stepped structure and the top end part of the main valve spool (2) is located right below the overpressure exhaust channel (18).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921418866.9U CN210423863U (en) | 2019-08-29 | 2019-08-29 | Pressure reducer integrating overpressure protection function |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921418866.9U CN210423863U (en) | 2019-08-29 | 2019-08-29 | Pressure reducer integrating overpressure protection function |
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| Publication Number | Publication Date |
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| CN210423863U true CN210423863U (en) | 2020-04-28 |
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| CN201921418866.9U Active CN210423863U (en) | 2019-08-29 | 2019-08-29 | Pressure reducer integrating overpressure protection function |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110388489A (en) * | 2019-08-29 | 2019-10-29 | 天津航宇卓然科技有限公司 | A kind of pressure reducer of integrated overpressure protection function |
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2019
- 2019-08-29 CN CN201921418866.9U patent/CN210423863U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110388489A (en) * | 2019-08-29 | 2019-10-29 | 天津航宇卓然科技有限公司 | A kind of pressure reducer of integrated overpressure protection function |
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