CN216975961U

CN216975961U - Pneumatic head limiting device of pneumatic regulating valve

Info

Publication number: CN216975961U
Application number: CN202220417389.XU
Authority: CN
Inventors: 罗晓林; 贺成龙; 梅俊; 黄勇; 米红松; 史政林; 杨远来
Original assignee: China General Nuclear Power Corp; Guangxi Fangchenggang Nuclear Power Co Ltd
Current assignee: China General Nuclear Power Corp; Guangxi Fangchenggang Nuclear Power Co Ltd
Priority date: 2022-02-28
Filing date: 2022-02-28
Publication date: 2022-07-15
Anticipated expiration: 2032-02-28

Abstract

The utility model relates to a pneumatic head limiting device of a pneumatic regulating valve, which comprises a supporting seat and a limiting rod; the support seat is arranged on an upper chamber cover of a pneumatic head of the pneumatic regulating valve and used for installing the limiting rod; the limiting rod is installed on the supporting seat and penetrates into the upper cavity cover to be connected with the pneumatic head executing mechanism, the pneumatic head executing mechanism is limited through reciprocating motion, and therefore the valve opening degree of the pneumatic regulating valve is limited. The limiting rod arranged on the supporting seat penetrates into the upper chamber cover to be connected with the pneumatic head executing mechanism, and the pneumatic head executing mechanism is limited through the reciprocating motion of the limiting rod, so that the maximum limiting control of the valve is realized. The limiting device for the pneumatic head of the pneumatic regulating valve is simple to install, low in cost, safe and reliable, and capable of achieving online adjustment.

Description

Pneumatic head limiting device of pneumatic regulating valve

Technical Field

The utility model relates to the field of power plant engineering, in particular to a limiting device for a pneumatic head of a pneumatic regulating valve.

Background

In an industrial production system, in order to ensure automatic and accurate adjustment and control of flow, pressure, temperature and other parameters of media in the system, pneumatic control valves are increasingly applied to automatic production. In some stages of the production process, due to process requirements or safety considerations, strict requirements are imposed on the maximum opening of the valve under certain working conditions at some times, the opening of the valve is usually controlled electrically, and the maximum opening of a control signal is usually set normally, so that the opening of the valve can be effectively controlled to meet the process requirements. Due to the fact that a valve actuator is in fault, upstream signal disturbance, valve position feedback deviation or loss and the like can suddenly cause valve out of control, the fact that a valve exceeds a safety set maximum opening degree leads process parameters to exceed a design range and causes the quality of produced products to be not satisfactory, or safety production accidents are directly caused, and therefore in the related technology, certain risks exist through the opening degree of an electric control valve. The adjusting range of the existing adjusting valve is 0-100%, the maximum mechanical limit control function is not provided, and the manual valve operation is easily damaged due to impact in the valve opening process when mechanical limit is performed through a general hand wheel operating mechanism.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem of providing an improved pneumatic head limiting device of a pneumatic regulating valve.

The technical scheme adopted by the utility model for solving the technical problems is as follows: constructing a pneumatic head limiting device of a pneumatic regulating valve, which comprises a supporting seat and a limiting rod; the support seat is arranged on an upper chamber cover of a pneumatic head of the pneumatic regulating valve and used for installing the limiting rod; the limiting rod is installed on the supporting seat and penetrates into the upper chamber cover to be connected with the pneumatic head executing mechanism, and the pneumatic head executing mechanism is limited through reciprocating motion, so that the valve opening degree of the pneumatic regulating valve is limited.

Preferably, the limiting rod penetrates through the supporting seat;

the supporting seat is of a hollow structure with two through ends, and a first internal thread is arranged on the inner side wall of the supporting seat;

and a first external thread matched with the first internal thread is arranged on the limiting rod.

Preferably, the limiting rod comprises a body and a connecting part arranged at one end of the body and connected with the pneumatic head actuating mechanism;

the body penetrates into the upper cavity cover from the supporting seat;

the first external thread is arranged on the body.

Preferably, the limiting rod is a hollow structure with two through ends, and an airflow channel communicated with an external air filter is formed on the inner side of the limiting rod.

Preferably, the pneumatic head limiting device of the pneumatic regulating valve further comprises a fastener for locking the limiting rod and the supporting seat.

Preferably, a second internal thread is arranged on the fastener;

and a second external thread matched with the second internal thread is arranged on the limiting rod.

Preferably, the pneumatic head limiting device of the pneumatic regulating valve further comprises an adapter arranged on the limiting rod and used for being connected with an external air filter.

Preferably, the adaptor comprises a sleeve body sleeved on the limiting rod.

Preferably, a third internal thread is arranged in the sleeve body;

and a third external thread matched with the third internal thread is arranged on the limiting rod.

Preferably, a fourth internal thread connected with the air filter is arranged in the sleeve body.

The implementation of the pneumatic head limiting device of the pneumatic regulating valve has the following beneficial effects: the pneumatic head limiting device of the pneumatic regulating valve penetrates into the upper cavity cover through the limiting rod arranged on the supporting seat to be connected with the pneumatic head executing mechanism, and the pneumatic head executing mechanism is limited through the reciprocating motion of the limiting rod, so that the maximum limiting control of the valve is realized. The pneumatic head limiting device of the pneumatic regulating valve is simple to install, low in cost, safe and reliable, and capable of achieving online adjustment.

Drawings

The utility model will be further described with reference to the accompanying drawings and examples, in which:

FIG. 1 is a cross-sectional view of a pneumatic head restraint of a pneumatic regulator valve in accordance with certain embodiments of the present invention;

FIG. 2 is a cross-sectional view of a support base of the pneumatic head restraint of the pneumatic regulator valve of FIG. 1;

FIG. 3 is a cross-sectional view of a stop rod of the pneumatic head stop of the pneumatic regulator valve of FIG. 1;

FIG. 4 is a cross-sectional view of a fastener of the pneumatic head restraint of the pneumatic regulator valve of FIG. 1;

FIG. 5 is a cross-sectional view of an adapter of the pneumatic head restraint of the pneumatic regulator valve of FIG. 1.

Detailed Description

For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

FIG. 1 illustrates some preferred embodiments of the pneumatic regulator valve pneumatic head restraint of the present invention. The pneumatic head limiting device of the pneumatic regulating valve can mechanically limit the pneumatic regulating valve, so that the maximum limiting control of the valve is realized. The limiting device for the pneumatic head of the pneumatic regulating valve is simple in structure, simple to install, low in cost, easy to realize, safe and reliable, and capable of realizing online adjustment.

Further, as shown in fig. 1, in some embodiments, the pneumatic head limiting device of the pneumatic regulating valve may be a mechanical limiting structure, and may include a supporting seat 10 and a limiting rod 20. The support base 10 can be installed on the upper chamber cover of the pneumatic head of the pneumatic regulating valve, and is used for installing the limiting rod 20. The limiting rod 20 can be installed on the supporting seat 10 and can penetrate into the upper chamber cover, and can be connected with the pneumatic head executing mechanism, and can limit the pneumatic head executing mechanism through reciprocating motion, so that the valve opening of the pneumatic regulating valve is limited. In some embodiments, the support base 10 and the limiting rod 20 may be made of carbon steel or stainless steel.

Further, as shown in fig. 2, in some embodiments, the supporting seat 10 may be cylindrical, and has a hollow structure with two ends penetrating through, and the supporting seat 10 may be welded and fixed on the upper chamber cover of the pneumatic head. Of course, it is understood that in other embodiments, the support base 10 may not be limited to being welded to the upper chamber cover of the pneumatic head. In some embodiments, the inner sidewall of the supporting seat 10 is provided with a first internal thread 11, and the first internal thread 11 can be used for being screwed with the limiting rod 20, so as to facilitate the limiting rod 20 to realize the reciprocating motion along the axial direction of the supporting seat 10 by being rotatably connected with the supporting seat 10.

As shown in fig. 1 and 3, further, in some embodiments, the limiting rod 20 can pass through the central through hole of the supporting seat 10 and can pass through the upper cavity cover from the circular through hole formed at the top of the upper cavity cover. In some embodiments, the diameter of the circular through hole formed at the top of the upper chamber cover may be smaller than the outer diameter of the supporting seat 10, and specifically, the outer diameter of the circular through hole is 3 to 5mm smaller than the outer diameter of the supporting seat 10. The limiting rod 20 may include a body 21 and a connecting portion 22. The connecting portion 22 may be disposed at one end of the body 21 and may be integrally formed with the body 21.

The body 21 may be cylindrical and may have a hollow structure with two ends penetrating. The inner side of the body 21 can form an air flow channel 24, and the air flow channel 24 can be used for communicating with an external air filter and is used for keeping the upper chamber of the pneumatic head connected with the atmosphere so as to ensure the normal air suction and exhaust of the upper chamber. The air flow channel 24 can be a central through hole of the body 21, and the diameter of the central through hole can be 6-10 mm. In some embodiments, the body 21 can penetrate into the upper chamber cover from the supporting seat 10, specifically, the body 21 can penetrate into the circular through hole at the top of the upper chamber cover, and the body 21 can be screwed with the supporting seat 10. In some embodiments, the limiting rod 20 is provided with a first external thread 211, and the first external thread 211 may be disposed on an outer side wall of the body 21 and may be matched with the first internal thread 11. Through the cooperation of this first external screw thread 211 and this first internal thread 11 to can make this gag lever post 20 and this supporting seat 10 rotatable coupling, thereby the accessible rotates this gag lever post 20 and makes this gag lever post 20 can follow the axial reciprocating motion of this supporting seat 10, and then can drive this pneumatic head actuating mechanism's actuating lever reciprocating motion, realize spacing the valve aperture of pneumatic control valve. During the use, accessible closes this gag lever post 20 and this supporting seat 10 soon, adjusts this supporting seat 10 and this gag lever post 20 bottom apart from "X", and gag lever post 20 bottom is located pneumatic head actuating mechanism actuating lever top, realizes the biggest limit control through the distance of adjustment "X".

The connecting portion 22 is disposed at one end of the body 21 penetrating into the upper chamber cover. The connecting portion 22 may have a cylindrical shape and a hollow structure having an opening at one end. The connecting portion 22 may have an outer diameter greater than that of the body 21. The connecting portion 22 may be adapted to be connected to the pneumatic head actuator, in particular, it may be detachably connected to an actuator rod of the pneumatic head actuator.

Further, as shown in fig. 1 and 4, in some embodiments, the pneumatic head restraint of the pneumatic regulator valve may further include a fastener 30. The fastening member 30 can be sleeved on the limiting rod 20 and located at an end of the supporting base 10 opposite to the upper chamber cover. The fastening member 30 may be a lock nut, and may be used to lock the limiting rod 20 and the supporting seat 10. In some embodiments, the fastening member 30 is provided with a second internal thread 31, the stop rod 20 is provided with a second external thread 212, the second external thread 212 may be located on an outer side wall of the body 21 and may be arranged side by side with the first external thread 211, and in other embodiments, the second external thread 212 and the first external thread 211 may be the same. The second external threads 212 can be engaged with the second internal threads 31, so as to facilitate the fastening member 30 to lock the limiting rod 20 on the supporting seat 10. After the position of the maximum valve opening adjustment limit position according to the process requirements is qualified, namely the distance adjustment of the X is completed, the locking nut is screwed, and the locking nut is released until the limit rod 20 is loosened in the operation process.

As shown in fig. 1 and 5, further, in some embodiments, the pneumatic head limiting device of the pneumatic regulating valve further includes an adaptor 40; the adaptor 40 may be disposed on the limiting rod 20 for connecting with an external air filter. In some embodiments, the adaptor 40 may include a sleeve 41, and the sleeve 41 may be sleeved on the limiting rod 20 and may be screwed with the limiting rod 20. In some embodiments, a sleeve portion 23 is disposed at an end of the body 21 away from the connecting portion 22, and the sleeve body 41 can be sleeved on the sleeve portion 23. In some embodiments, a third internal thread 411 is disposed in the sleeve 41, a third external thread 231 is disposed on the limiting rod 20, and the third external thread 231 may be located on the outer sidewall of the sleeve portion 23 and may be disposed corresponding to the third internal thread 411, which may cooperate with the third internal thread 411, so as to realize the screw connection between the sleeve 41 and the sleeve portion 23. In some embodiments, the inner diameter of the sheath 41 can be adapted to the outer diameter of the socket 23. In some embodiments, the length of the sheath 41 may be greater than the length of the sleeve 23 so as to facilitate connection with an air filter, and specifically, the portion of the sheath 41 protruding out of the sleeve 23 may be sleeved on the air filter so as to connect the limiting rod 20 with the air filter. In some embodiments, a fourth internal thread may be disposed in the sheath body 41, and the fourth internal thread may be disposed side by side with the third internal thread 411, and in other embodiments, the fourth internal thread and the third internal thread 411 may be the same, and the sheath body 41 may be connected to the air filter through the fourth internal thread.

In some embodiments, a limiting structure 25 for limiting the adaptor 40 may be further disposed on the limiting rod 20, and the limiting structure 25 may be located between the body 21 and the socket 23, and has an outer diameter larger than an inner diameter of the socket 23, so as to limit the position of the adaptor 40 and prevent the adaptor 40 from sliding off.

It is to be understood that the foregoing examples, while indicating the preferred embodiments of the utility model, are given by way of illustration and description, and are not to be construed as limiting the scope of the utility model; it should be noted that, for those skilled in the art, the above technical features can be freely combined, and several changes and modifications can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention; therefore, all equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the claims of the present invention.

Claims

1. A pneumatic head limiting device of a pneumatic regulating valve is characterized by comprising a supporting seat (10) and a limiting rod (20); the support seat (10) is arranged on an upper chamber cover of a pneumatic head of the pneumatic regulating valve and used for mounting the limiting rod (20); the limiting rod (20) is installed on the supporting seat (10) and penetrates into the upper chamber cover to be connected with the pneumatic head executing mechanism, the pneumatic head executing mechanism is limited through reciprocating motion, and then the valve opening degree of the pneumatic regulating valve is limited.

2. The pneumatic head limiting device of a pneumatic regulating valve according to claim 1, wherein the limiting rod (20) is arranged on the supporting seat (10) in a penetrating way;

the supporting seat (10) is of a hollow structure with two through ends, and a first internal thread (11) is arranged on the inner side wall of the supporting seat (10);

and a first external thread (211) matched with the first internal thread (11) is arranged on the limiting rod (20).

3. The pneumatic regulating valve pneumatic head limiting device according to claim 2, wherein the limiting rod (20) comprises a body (21) and a connecting part (22) which is arranged at one end of the body (21) and is connected with the pneumatic head actuating mechanism;

the body (21) penetrates into the upper chamber cover from the supporting seat (10);

the first external thread (211) is arranged on the body (21).

4. The pneumatic head limiting device of a pneumatic regulating valve according to claim 1, wherein the limiting rod (20) is a hollow structure with two ends communicated, and an air flow channel (24) communicated with an external air filter is formed on the inner side of the limiting rod.

5. Pneumatic regulator valve pneumatic head stop according to claim 1, characterized in that it further comprises a fastener (30) locking the stop rod (20) with the support seat (10).

6. The pneumatic regulator valve pneumatic head limiting device according to claim 5, wherein the fastening member (30) is provided with a second internal thread (31);

and a second external thread (212) matched with the second internal thread (31) is arranged on the limiting rod (20).

7. The pneumatic head restraint device of claim 1, further comprising an adapter (40) disposed on the restraint rod (20) for connection with an external air filter.

8. The pneumatic head limiting device of a pneumatic regulating valve according to claim 7, wherein the adaptor (40) comprises a sleeve body (41) sleeved on the limiting rod (20).

9. The pneumatic head stop device of a pneumatic regulating valve according to claim 8, characterized in that a third internal thread (411) is provided in the sleeve body (41);

and a third external thread (231) matched with the third internal thread (411) is arranged on the limiting rod (20).

10. Pneumatic head restraint device for a pneumatic regulating valve according to claim 8, characterized in that a fourth internal thread is provided in the housing (41) for connection to the air filter.