CN216009558U

CN216009558U - Pneumatic film regulating valve

Info

Publication number: CN216009558U
Application number: CN202121994732.9U
Authority: CN
Inventors: 华鑫美; 张江荣
Original assignee: Zhejiang Yongsheng Technology Co ltd
Current assignee: Zhejiang Yongsheng Technology Co ltd
Priority date: 2021-08-23
Filing date: 2021-08-23
Publication date: 2022-03-11
Anticipated expiration: 2031-08-23

Abstract

The utility model discloses a pneumatic membrane regulating valve which comprises a valve body, a valve core, a valve rod and a valve cover, wherein the valve body comprises a lower cavity and an upper cavity, the valve cover is arranged on the valve body, the valve rod movably penetrates through the valve cover and is coaxially and fixedly connected with the valve core, a pressure reducing piece is arranged at the communication part of the upper cavity and the lower cavity of the valve body, a valve seat is arranged at the communication part of the valve body and the pressure reducing piece, and a conical surface seal is arranged between the valve core and the valve seat. The arrangement of the pressure reducing piece is beneficial to reducing the strong scouring of media on the valve core and the valve seat of the regulating valve under the working condition of small flow, realizes the effective control of the pressure reduction of the small flow and prolongs the service life.

Description

Pneumatic film regulating valve

Technical Field

The utility model relates to a regulating valve, in particular to a pneumatic membrane regulating valve.

Background

The pneumatic film regulating valve is one of the important parts in automatic regulating system for production process, and can receive the output signal of the regulating instrument to close and open the valve so as to regulate the pressure, temperature, flow, liquid level and other parameters automatically. However, the pneumatic membrane regulating valve at the present stage is difficult to be used for pressure reduction control of micro flow, mainly because the medium pressure flowing through the valve body is too large, and the cut-off surface of the valve core and the valve seat is washed away, so that the cut-off area is increased, and the micro flow cannot be regulated and controlled. For example, a "pneumatic membrane control valve" disclosed in chinese patent literature, whose publication number is CN205190776U, includes a valve body, a valve seat, a valve element, a valve rod, a support, connecting pipes, a push rod, a lower membrane cover, a spring, a membrane, and an upper membrane cover, where one end of the valve body is provided with the valve seat and the surface of the valve seat is fixedly provided with a hemispherical valve element, the surface of the valve element is fixedly connected with the valve rod and the valve rod is arranged inside the support, one end of the support is provided with two connecting pipes, one end of the connecting pipe is connected with the push rod and the other end of the connecting pipe is fixedly connected with the lower membrane cover, and the surface of the lower membrane cover is provided with the spring.

SUMMERY OF THE UTILITY MODEL

The utility model provides a pneumatic film regulating valve capable of effectively controlling the pressure reduction of small flow, aiming at overcoming the defect that the conventional pneumatic regulating valve cannot effectively control the pressure reduction of small flow.

In order to achieve the purpose, the utility model adopts the following technical scheme:

the utility model provides a pneumatic membrane control valve, includes valve body, case, valve rod and valve gap, the valve body includes cavity of resorption and epicoele, and the valve gap setting is on the valve body, the valve rod activity run through on the valve gap and with the coaxial fixed connection of case, the circulation department of epicoele and cavity of resorption of valve body is equipped with the reduction member, the valve body is equipped with the disk seat with the intercommunication department of reduction member, be conical surface sealing between case and the disk seat. Through setting up the reduction pressure piece, be favorable to reducing the case and the disk seat of governing valve and receive the strong washing of medium fluid when the low discharge operating mode, realize carrying out effective control to the step-down of low discharge to increase of service life.

Preferably, an inlet flow channel for a medium to enter, a plurality of 180-degree turning flow channels and an outlet flow channel for the medium to flow out are arranged in the pressure reduction piece, and the cross-sectional area of each 180-degree turning flow channel is gradually increased. The medium enters from the lower cavity of the valve body and passes through the 180-degree turning flow channel, on one hand, the pressure loss of the medium is gradually increased along with the increase of the sectional area of the turning flow channel, and the flushing effect of the medium on the valve core and the valve seat before entering the valve seat is reduced; on the other hand, the medium changes the flow direction along the 180-degree turning flow channel and enters the valve seat according to the designated direction.

Preferably, the valve seat is provided with a valve seat flow passage for the inflow of the medium, and the outlet flow passage on the pressure reducing member is staggered with the valve seat flow passage. The arrangement prevents the medium from being flushed away from the outlet flow channel of the pressure reduction part in the process of flowing out, so that the damage to the valve core is reduced, and the service life of the valve core is prolonged.

Preferably, the pressure reducing piece is provided with a plane end, the rest surfaces are cambered surfaces, and the plane end is far away from a runner port through which the medium enters the pressure reducing piece from the lower cavity of the valve body. When a medium enters the pressure reducing piece, the medium inevitably generates a scouring effect on the pressure reducing piece, if the plane end of the pressure reducing piece is opposite to the entering direction of the medium, the received scouring strength is higher, and the cambered surface can divide the inflowing medium by taking the convex point of the cambered surface as the center, so that the service life of the pressure reducing piece is prolonged.

Preferably, the surface of the valve core contacting the valve seat is a valve core sealing surface, the surface of the valve seat contacting the valve core is a valve seat sealing surface, and a gap is formed between the sealing surface between the valve core and the valve seat flow passage. The interval sets up when making the cooperation of case disk seat sealed, helps alleviating the medium and to the erodeing of case and disk seat cut-off face, realizes the accurate control of governing valve to small flow.

Preferably, the valve core is cylindrical and is provided with an inclined cone adjusting curved surface and a buffer area. When the pressure signal received by the regulating valve is larger, the relative displacement between the valve core sealing surface and the valve seat sealing surface is larger, namely the interception area between the inclined cone regulating curved surface of the valve core and the valve seat flow channel is larger; on the contrary, the smaller the pressure signal is, the smaller the relative displacement between the valve core sealing surface and the valve seat sealing surface is, namely the smaller the flow-stopping area between the inclined cone adjusting curved surface of the valve core and the valve seat flow channel is; certain pressure signal corresponds certain valve aperture, and then realizes the accurate control of governing valve to little flow.

Preferably, the middle of the valve seat is tightly pressed with a noise reduction valve cage, the noise reduction valve cage is provided with a plurality of layers, valve cage circulation holes are arranged on each layer at intervals, and the size of each valve cage circulation hole is gradually increased from inside to outside. Which helps to attenuate noise generated during the flow of the media and also reduces or eliminates cavitation.

Therefore, the utility model has the following beneficial effects: (1) the arrangement of the pressure reducing piece is favorable for reducing the strong scouring of the valve core and the valve seat of the regulating valve by the medium fluid under the working condition of small flow, effectively controlling the pressure reduction of small flow and prolonging the service life of the regulating valve; (2) the inclined cone adjusting curved surface and the buffer area on the valve core can control the micro flow without the small opening work of the valve, and the practicability is high.

Drawings

FIG. 1 is a schematic sectional view of the assembly of the present invention.

Fig. 2 is a schematic view of the structure of the pressure drop member of the present invention.

Fig. 3 is a top view of a pressure drop of the present invention.

Fig. 4 is a schematic view of the structure of the valve seat of the present invention.

Fig. 5 is a partially enlarged view of a valve seat in the present invention.

Fig. 6 is a schematic view of the valve cartridge of the present invention.

Fig. 7 is a partially enlarged view of the valve body of the present invention.

In the figure: 1. the noise reduction valve comprises a valve body, 101, a lower cavity, 102, an upper cavity, 2, a pressure reducing piece, 201, an inlet flow channel, 202, a 180-degree turning flow channel, 203, an outlet flow channel, 3, a valve seat, 301, a valve seat sealing surface, 302, a valve seat flow channel, 4, a noise reduction valve cage, 5, a valve core, 501, an inclined cone adjusting curved surface, 502, a valve core sealing surface, 503, a buffer area, 6, a valve rod, 7 and a valve cover.

Detailed Description

The utility model is further described with reference to the following detailed description and accompanying drawings.

As shown in fig. 1 to 7, the pneumatic membrane regulating valve comprises a valve body 1, a valve core 5, a valve rod 6 and a valve cover 7, wherein the valve body 1 comprises a lower cavity 101 and an upper cavity 102, the valve cover 7 is arranged on the valve body 1, the valve rod 5 movably penetrates through the valve cover 7 and is coaxially and fixedly connected with the valve core 5, a pressure reducing part 2 is arranged at the circulation position of the upper cavity 101 and the lower cavity 102 of the valve body 1, a valve seat 3 is arranged at the communication position of the valve body 1 and the pressure reducing part 2, and a conical surface seal is arranged between the valve core 5 and the valve seat 3. The valve seat 3 is provided with a valve seat flow passage 302 for the inflow of media, and the outlet flow passage 202 on the pressure reduction member 2 is staggered with the valve seat flow hole 302. One end of the pressure drop element 2 is a cambered surface end, and the other end is a plane end, and the plane end is staggered with the inlet runner 201. The surface of the valve core 5 contacting the valve seat 3 is a valve core sealing surface 502, the surface of the valve seat 3 contacting the valve core 5 is a valve seat sealing surface 301, and a gap exists between the sealing surface between the valve core 5 and the valve seat 3 and the valve seat flow passage 302. The valve core 5 is cylindrical and is provided with an inclined cone adjusting curved surface 501 and a buffer area 503.

Specifically, the pressure reducing part 2 is provided with an inlet flow channel 201 for a medium to enter, a plurality of 180-degree turning flow channels 202 and an outlet flow channel 202 for the medium to flow out, and the cross-sectional area of each 180-degree turning flow channel 202 is gradually increased. On one hand, with the increase of the sectional area of the 180-degree turning flow channel 202, the pressure loss of the medium is gradually increased, which is beneficial to weakening the flushing effect of the medium on the valve core 5 and the valve seat 3 before the medium enters the valve seat 3; on the other hand, the media will change direction along the 180 degree turn flow path 202 and enter the valve seat 3 in the specified direction.

Specifically, the middle part of disk seat 3 compresses tightly and is equipped with the valve cage 4 of making an uproar that falls, the valve cage 4 of making an uproar that falls has a plurality of layers, and the interval is equipped with the valve cage opening on every layer, and the size of valve cage opening is from inside to outside grow gradually. Helping to attenuate flow noise and also reducing or eliminating cavitation.

In the use process, when the signal pressure received by the regulating valve is larger, the relative displacement between the valve core sealing surface 502 and the valve seat sealing surface 301 is larger, namely the interception area between the inclined cone regulating curved surface 501 of the valve core 5 and the valve seat flow channel 302 is larger; conversely, the smaller the signal pressure is, the smaller the relative displacement between the valve core sealing surface 502 and the valve seat sealing surface 301 is, that is, the smaller the flow-stopping area between the inclined cone adjusting curved surface 501 of the valve core 5 and the valve seat flow passage 302 is; certain pressure signal corresponds certain valve aperture, and then realizes the accurate control of governing valve to little flow.

Claims

1. A pneumatic membrane regulating valve comprises a valve body, a valve core, a valve rod and a valve cover, wherein the valve body comprises a lower cavity and an upper cavity, the valve cover is arranged on the valve body, and the valve rod movably penetrates through the valve cover and is coaxially and fixedly connected with the valve core;

the pressure reduction piece is provided with a plane end, the rest surfaces of the pressure reduction piece are cambered surfaces, and the plane end is far away from a runner port through which the medium enters the pressure reduction piece from the lower cavity of the valve body.

2. The pneumatic diaphragm control valve of claim 1 wherein said pressure drop element has an inlet channel for the ingress of media, a plurality of 180 degree turn channels and an outlet channel for the egress of media, said 180 degree turn channels having increasing cross-sectional areas.

3. The pneumatic diaphragm control valve of claim 1 or 2 wherein the valve seat defines a seat flow passage for the flow of the medium, and the outlet flow passage of the pressure reducing member is offset from the seat flow passage.

4. The pneumatic diaphragm control valve according to claim 1, wherein the surface of the valve element in contact with the valve seat is a valve element sealing surface, the surface of the valve seat in contact with the valve element is a valve seat sealing surface, and a gap is formed between the sealing surface between the valve element and the valve seat flow passage.

5. The pneumatic diaphragm regulating valve of claim 1, wherein the valve core is cylindrical and has a tapered regulating curved surface and a buffer area.

6. The pneumatic membrane regulating valve according to claim 1, wherein a noise reduction cage is arranged in the middle of the valve seat in a compression mode, the noise reduction cage is provided with a plurality of layers, cage flow holes are formed in each layer at intervals, and the sizes of the cage flow holes are gradually increased from inside to outside.