CN210266144U

CN210266144U - Bellows self-operated regulating valve

Info

Publication number: CN210266144U
Application number: CN201920947383.1U
Authority: CN
Inventors: 郑忠兴; 祁欢; 余孙杰
Original assignee: Zhejiang Xinou Automatic Control Instrument Co ltd
Current assignee: Zhejiang Xinou Automatic Control Instrument Co ltd
Priority date: 2019-06-21
Filing date: 2019-06-21
Publication date: 2020-04-07
Anticipated expiration: 2029-06-21

Abstract

The utility model discloses a bellows self-operated regulating valve, which comprises a valve body, a valve cover, a valve rod, a valve core and a valve cage, wherein a lower cylinder cover is arranged above the valve cover, the valve rod extends upwards out of the valve cover, the valve rod is provided with an upper spring seat, the valve cover is provided with a lower spring seat, and a compression spring is arranged between the valve cover and the lower spring seat in a compression way; the upper spring seat is provided with a push rod, the upper end of the lower cylinder cover is provided with a cylinder body, the push rod extends into the cylinder body, the upper end of the push rod is integrally provided with a piston, a metal corrugated pipe is arranged in the cylinder body and compressed between the lower cylinder cover and the piston, the interior of the metal corrugated pipe is isolated from the interior of the cylinder body and forms an independent inner cavity, and the lower cylinder cover is provided with a ventilation through hole communicated with the inner cavity; the flow passage is provided with an inlet side and an outlet side, the valve body is connected with a pressure sampling pipe fitting on the outlet side of the flow passage, and the pressure sampling pipe fitting extends into the cylinder body. The utility model has the advantages of it is following and effect: the actuator diaphragm is a metal corrugated pipe, is free of rubber materials, and is particularly suitable for high-temperature and high-temperature corrosive media.

Description

Bellows self-operated regulating valve

Technical Field

The utility model relates to the technical field of valves, in particular to bellows self-operated governing valve.

Background

The self-operated regulating valve drives the valve to automatically work by taking the pressure, flow and temperature of medium flowing through the valve as energy sources, and does not need an external power supply and a secondary instrument. Its advantages are automatic regulation; compared with an electric regulating valve, the electric regulating valve has the advantage that no external power is needed. Application practices prove that the flow distribution of the system can be conveniently realized by correctly using the valve in a closed water circulation system (such as a hot water heating system and an air-conditioning chilled water system); the dynamic balance of the system can be realized; the debugging work of the system can be greatly simplified; the operating state of the pump and the like can be stabilized.

The actuator part on the existing self-operated regulating valve mostly adopts a rubber diaphragm and a rubber sealing ring, the allowable temperature is low, a condenser is required to be matched when a high-temperature medium is used, the field installation and debugging are extremely complex, and the restriction problem of medium types exists.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a bellows self-operated governing valve, executor diaphragm are corrugated metal pipe, and do not have the rubber material, the specially adapted high temperature and high temperature corrosive medium.

The above technical purpose of the present invention can be achieved by the following technical solutions: a corrugated pipe self-operated regulating valve comprises a valve body and a valve cover, wherein the valve cover is arranged at the upper end of the valve body, a flow passage for the fluid medium to flow is arranged in the valve body, a valve rod which is arranged on the valve cover in a penetrating way is arranged on the valve cover, one end of the valve rod, which is positioned at the flow passage, is provided with a valve core, the valve rod can drive the valve core to realize reciprocating movement along the axial direction of the valve rod, a valve cage which is matched with the valve core to realize sealing is arranged in the valve body, a lower cylinder cover is arranged above the valve cover, a supporting stud for fixing the valve cover and the lower cylinder cover is arranged between the valve cover and the lower cylinder cover, the valve rod extends upwards out of the valve cover, an upper spring seat is fixedly arranged at the upper end of the valve rod, a lower spring seat is fixedly arranged at the upper end of the valve cover along the periphery, a compression spring is compressed between the upper spring seat and the lower spring seat, and the valve rod has the tendency of moving upwards through the compression spring; the upper end of the upper spring seat is fixedly provided with a push rod, the push rod and the upper spring seat are fixed through a round nut, the upper end of the lower cylinder cover is fixedly provided with a cylinder body, the upper end of the cylinder body is fixedly provided with an upper cylinder cover used for covering the cylinder body, the lower cylinder cover is provided with a shaft sleeve, the push rod upwards penetrates through the shaft sleeve and extends into the cylinder body, the upper end of the push rod is integrally provided with a piston, the piston can be pressed in the cylinder body to perform vertical axial piston motion, a metal corrugated pipe is arranged in the cylinder body, the metal corrugated pipe is compressed between the lower cylinder cover and the piston and is driven by the piston to have a compression or extension state, the interior of the metal corrugated pipe is isolated from the interior of the cylinder body and forms an independent inner cavity, and the lower cylinder cover is provided with a ventilation through hole communicated with the inner cavity of; the flow passage is provided with an inlet side and an outlet side, the valve body is connected with a pressure sampling pipe on the outlet side of the flow passage, the pressure sampling pipe extends into the cylinder body, and the pressure generated by the flow passage on the outlet side after the valve can enter the cylinder body through the pressure sampling pipe and apply pressure to the piston, so that the piston is pushed to perform axial piston movement.

Further setting the following steps: the pressure-taking pipe fitting is connected with a needle valve for controlling the communication or the cut-off of the pressure-taking pipe fitting.

Further setting the following steps: the two sides of the valve rod are provided with packing, a compression ring is arranged above the packing, a packing gland for extruding the packing is arranged above the compression ring, the packing gland is provided with a bolt in threaded fit with the valve cover, and the head of the bolt is abutted against the upper side of the packing gland.

The utility model has the advantages that:

1. the actuator diaphragm in the utility model is a metal bellows, has wide material selection range, and is particularly suitable for high temperature and high temperature corrosive media; the actuator part (namely the cylinder body) does not have a rubber sealing element, and the working temperature range is large; the problems proposed in the background art are effectively solved.

2. The utility model discloses the inside isolated and the formation independent inner chamber of the inside of well corrugated metal pipe and cylinder body, this inner chamber can be linked together with the outside, has guaranteed corrugated metal pipe can be stable, continuous compress or stretch out the motion, and corrugated metal pipe's inner chamber is isolated with the inside of cylinder body simultaneously, can avoid the air leakage of inner chamber to the cylinder body in, leads to automatically regulated to produce the error or even inefficacy.

3. The utility model discloses in through the setting of last spring holder, lower spring holder and compression spring for the valve rod has reset function, is favorable to realizing the dynamic balance of system, lets the valve back pressure keep at the given scope.

4. The piston and the push rod are integrally designed, and the structure is simple and reliable.

5. The filler design effectively seals the communication between the fluid medium in the valve body and the atmosphere, so that the whole valve body cannot generate a leakage phenomenon; the design of the packing gland plays a role in sealing different packing materials and depths; the packing gland and the valve cover are connected through the bolt, so that packing is tightly arranged between the valve body and the valve rod through the extrusion of the packing gland, the sealing is more reliable, and the leakage of a flow passage caused by the loosening of the packing is prevented; maintenance-free is basically realized.

6. The pressure tapping pipe fitting is provided with the needle valve, so that the opening and closing are quick, the installation is convenient, and the maintenance and the overhaul of the actuator are convenient.

Drawings

Fig. 1 is a schematic structural diagram of the embodiment.

In the figure: 11. a valve body; 12. a cage; 13. a valve core; 14. a valve stem; 15. a valve cover; 16. a flow channel; 21. a lower cylinder cover; 22. a support stud; 23. an upper spring seat; 24. a lower spring seat; 25. a compression spring; 31. a filler; 32. pressing a ring; 33. a packing gland; 34. a bolt; 41. a push rod; 42. a round nut; 43. a cylinder body; 44. an upper cylinder cover; 45. a shaft sleeve; 46. a piston; 47. a metal bellows; 48. an inner cavity; 49. a ventilation through hole; 51. taking a pressure pipe fitting; 52. a needle valve.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Referring to the attached figure 1, the corrugated pipe self-operated regulating valve comprises a valve body 11 and a valve cover 15, wherein the valve cover 15 is arranged at the upper end of the valve body 11 in a covering manner, a flow passage 16 for a fluid medium to flow is formed in the valve body 11, a valve rod 14 penetrating the flow passage 16 is arranged on the valve cover 15, a valve core 13 is arranged at one end, located at the flow passage 16, of the valve rod 14, the valve rod 14 can drive the valve core 13 to reciprocate along the axial direction of the valve rod 14, and a valve cage 12 matched with the valve core 13 to realize sealing is; the valve rod 14 will drive the valve core 13 to move synchronously, thereby the communication or the cut-off of the flow passage 16 is realized by the cooperation of the valve core 13 and the valve cage 12. The above-mentioned structure is the basic structure of the regulating valve, belonging to the field of the prior art, and therefore will not be described herein.

A lower cylinder cover 21 is arranged above the valve cover 15, a supporting stud 22 for fixing the structures of the valve cover 15 and the lower cylinder cover 21 is arranged between the valve cover 15 and the lower cylinder cover 21, the valve rod 14 extends upwards out of the valve cover 15, an upper spring seat 23 is fixedly arranged at the upper end of the valve rod 14, a lower spring seat 24 is fixedly arranged at the upper end of the valve cover 15 along the periphery, a compression spring 25 is arranged between the upper spring seat 23 and the lower spring seat 24 in a compression mode, and the valve rod 14 has the tendency of moving upwards through the compression spring 25; therefore, the valve rod 14 is driven by the acting force of the compression spring 25 to reset the valve core 13, which is beneficial to realizing the dynamic balance of the valve body 11 and keeping the internal pressure of the valve body 11 in a given range.

The upper end of the upper spring seat 23 is fixedly provided with a push rod 41, the push rod 41 and the upper spring seat 23 are fixed through a round nut 42, the upper end of the lower cylinder cover 21 is fixedly provided with a cylinder body 43, the upper end of the cylinder body 43 is fixedly provided with an upper cylinder cover 44 for covering the cylinder body 43, the lower cylinder cover 21 is provided with a shaft sleeve 45, the push rod 41 penetrates through the shaft sleeve 45 upwards and extends into the cylinder body 43, the upper end of the push rod 41 is integrally provided with a piston 46, and the piston 46 can be pressed in the cylinder 43 to move up and down the axial piston 46, a metal corrugated pipe 47 is arranged in the cylinder 43, the metal corrugated pipe 47 is compressed between the lower cylinder cover 21 and the piston 46 and is driven by the piston 46 to have a compressed or extended state, the interior of the metal corrugated pipe 47 is isolated from the interior of the cylinder body 43 and forms an independent inner cavity 48, and the lower cylinder cover 21 is provided with a ventilation through hole 49 communicated with the inner cavity 48 of the metal corrugated pipe 47; the compression or expansion movement of the metal corrugated pipe 47 is more stable through the ventilation through hole 49, and meanwhile, due to the independent inner cavity 48 of the metal corrugated pipe 47, air in the inner cavity 48 can be prevented from leaking into the cylinder body 43, so that the automatic adjustment is prevented from generating errors and even being invalid.

The flow passage 16 has an inlet side and an outlet side, the valve body 11 is connected with a pressure sampling pipe 51 at the outlet side of the flow passage 16, the pressure sampling pipe 51 extends into the cylinder 43, and the post-valve pressure generated at the outlet side of the flow passage 16 can enter the cylinder 43 through the pressure sampling pipe 51 and apply pressure to the piston 46, so as to push the piston 46 to perform axial piston motion. The piston 46 is driven downwards (or upwards) through the change of the pressure behind the valve and the interaction force between the compression springs 25 so as to drive the push rod 41, the valve rod 14 and the valve core 13 to act in turn, and the acting force of the medium behind the valve and the reaction force of the compression springs 25 are balanced to keep the pressure behind the valve in a given range. In addition, the pressure sampling pipe 51 is connected with a needle valve 52 for controlling the communication or the cut-off of the pressure sampling pipe, the needle valve 52 is a commercially available product and can be directly purchased from the market, and the pressure sampling pipe has the advantages of being fast in opening and closing and convenient to install.

Further, packing 31 is provided on both sides of the valve stem 14, a pressing ring 32 is provided above the packing 31, a packing cover 33 that presses the packing 31 is provided above the pressing ring 32, a bolt 34 that is screwed to the bonnet 15 is provided on the packing cover 33, and the head of the bolt 34 abuts on the upper side of the packing cover 33.

The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications to the present embodiment without inventive contribution as required after reading the present specification, but all of them are protected by patent laws within the scope of the claims of the present invention.

Claims

1. The utility model provides a bellows formula of relying on oneself governing valve, includes valve body (11) and valve gap (15), valve gap (15) lid locate the upper end of valve body (11), valve body (11) in seted up runner (16) that supply the fluid medium circulation, valve gap (15) on install valve rod (14) of wearing to establish to runner (16), valve rod (14) one end that is located runner (16) install case (13), valve rod (14) can drive case (13) and realize reciprocating motion along the axial of valve rod (14), valve body (11) in be equipped with in cooperation case (13) and realize sealed valve cage (12), its characterized in that:

a lower cylinder cover (21) is arranged above the valve cover (15), a supporting stud (22) for fixing the structures of the valve cover (15) and the lower cylinder cover (21) is arranged between the valve cover (15) and the lower cylinder cover (21), the valve rod (14) extends upwards out of the valve cover (15), an upper spring seat (23) is fixedly arranged at the upper end of the valve rod (14), a lower spring seat (24) is fixedly arranged at the upper end of the valve cover (15) along the periphery, a compression spring (25) is arranged between the upper spring seat (23) and the lower spring seat (24) in a compression mode, and the valve rod (14) has the tendency of moving upwards through the compression spring (25);

the upper end of the upper spring seat (23) is fixedly provided with a push rod (41), the push rod (41) and the upper spring seat (23) are fixed through a round nut (42), the upper end of the lower cylinder cover (21) is fixedly provided with a cylinder body (43), the upper end of the cylinder body (43) is fixedly provided with an upper cylinder cover (44) used for covering the cylinder body (43), the lower cylinder cover (21) is provided with a shaft sleeve (45), the push rod (41) upwards penetrates through the shaft sleeve (45) and extends into the cylinder body (43), the upper end of the push rod (41) is integrally provided with a piston (46), the piston (46) can be pressed in the cylinder body (43) to perform vertical axial piston movement, the cylinder body (43) is internally provided with a metal corrugated pipe (47), and the metal corrugated pipe (47) is compressed between the lower cylinder cover (21) and the piston (46) and is driven by the piston (46) to have a compression or extension state, the interior of the metal corrugated pipe (47) is isolated from the interior of the cylinder body (43) and forms an independent inner cavity (48), and the lower cylinder cover (21) is provided with a ventilation through hole (49) communicated with the inner cavity (48) of the metal corrugated pipe (47);

the flow passage (16) is provided with an inlet side and an outlet side, the valve body (11) is connected with a pressure taking pipe piece (51) on the outlet side of the flow passage (16), the pressure taking pipe piece (51) extends into the cylinder body (43), and the pressure generated by the flow passage (16) on the outlet side can enter the cylinder body (43) through the pressure taking pipe piece (51) and apply pressure to the piston (46), so that the piston (46) is pushed to perform axial piston movement.

2. The bellows self-operated regulator valve of claim 1, wherein: the pressure-taking pipe fitting (51) is connected with a needle valve (52) for controlling the communication or the cut-off of the pressure-taking pipe fitting.

3. The bellows self-operated regulator valve of claim 1, wherein: the both sides of valve rod (14) all be provided with packing (31), the top of packing (31) be provided with clamping ring (32), clamping ring (32) top be provided with gland (33) of extrusion packing (31), gland (33) be provided with valve gap (15) screw-thread fit's bolt (34), the head and gland (33) top of this bolt (34) offset.