阅读说明：本技术 一种气动薄膜降压调节阀 (Pneumatic film pressure reduction regulating valve ) 是由 华鑫美 张江荣 于 2021-08-19 设计创作，主要内容包括：本发明公开了一种气动薄膜降压调节阀,包括阀体、阀芯、阀杆和阀盖,所述阀体包括下腔和上腔,阀盖与阀体上部固定连接,阀杆与阀芯固定连接,所述阀体与降压件的连通处设有阀座,所述阀体的上腔和下腔的流通处设有降压件,所述降压件内设有若干条交替布置的横向流道和纵向流道。本发明降压件中横向流道和纵向流道的设置可引导介质沿着横向流道改变流动方向,并按照指定方向进入阀座,并有助于减少调节阀的阀芯和阀座在小流量工况时受到介质流体的强烈冲刷,实现对小流量的降压进行有效地控制并延长使用寿命。(The invention discloses a pneumatic film pressure-reducing 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 fixedly connected with the upper part of the valve body, the valve rod is fixedly connected with the valve core, a valve seat is arranged at the communication part of the valve body and a pressure-reducing piece, the pressure-reducing piece is arranged at the communication part of the upper cavity and the lower cavity of the valve body, and a plurality of alternately arranged transverse flow channels and longitudinal flow channels are arranged in the pressure-reducing piece. The arrangement of the transverse flow channel and the longitudinal flow channel in the pressure reducing piece can guide a medium to change the flowing direction along the transverse flow channel and enter the valve seat according to the specified direction, is favorable for reducing the strong scouring of medium fluid 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.)

1. The utility model provides a pneumatic film step-down governing valve, includes valve body, case, valve rod and valve gap, the valve body includes cavity of resorption and epicoele, valve gap and valve body upper portion fixed connection, valve rod and case fixed connection, its characterized in that, the intercommunication department of valve body and step-down piece is equipped with the disk seat, the circulation department of the epicoele of valve body and cavity of resorption is equipped with the step-down piece, be equipped with a plurality of alternately arranged's horizontal runner and longitudinal flow way in the step-down piece.

2. The pneumatic diaphragm depressurizing and regulating valve according to claim 1 wherein the cross flow path and the longitudinal flow path are each gradually increased in cross-sectional area.

3. The pneumatic diaphragm pressure reducing regulating valve according to claim 1 or 2, wherein the transverse flow passage is communicated with a longitudinal flow passage, the longitudinal flow passage is located at an end of the transverse flow passage, and two longitudinal flow passages communicating with the same transverse flow passage are respectively arranged at two ends of the transverse flow passage.

4. The pneumatic diaphragm pressure reducing regulator valve of claim 1, wherein the valve seat has a valve seat flow passage for the medium to flow into, and the outlet flow passage of the pressure reducing member is offset from the valve seat flow passage.

5. The pneumatic membrane pressure-reducing regulating valve as claimed in claim 1, wherein a conical surface seal is formed between the valve core and the valve seat, the surface of the valve core contacting the valve seat is a valve core sealing surface, and the surface of the valve seat contacting the valve core is a valve seat sealing surface.

6. The pneumatic diaphragm depressurizing and regulating valve according to claim 5, wherein a space exists between the sealing surface between said valve core and said valve seat and the flow passage of said valve seat.

7. The pneumatic diaphragm depressurizing and regulating valve according to claim 1, wherein the bottom of said valve core is provided with an extension portion, and said extension portion comprises a cylindrical surface and an oblique conical surface.

8. The pneumatic membrane pressure-reducing regulating valve as claimed in claim 1, wherein a noise-reducing cage is compressed in the middle of the valve seat, the noise-reducing cage has a plurality of layers, cage flow holes are arranged at intervals on each layer, and the size of the cage flow holes is gradually increased from inside to outside.

Technical Field

The invention relates to a regulating valve, in particular to a pneumatic membrane depressurization 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.

Disclosure of Invention

The invention provides a pneumatic film pressure reduction regulating valve which can effectively reduce the scouring of a medium to a valve core and a valve seat and effectively control the pressure reduction of small flow, and aims to solve the problems that the conventional pneumatic regulating valve has large scouring to the valve core and the valve seat in the medium flowing process and cannot effectively control the pressure reduction of small flow.

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

the utility model provides a pneumatic film step-down governing valve, includes valve body, case, valve rod and valve gap, the valve body includes cavity of resorption and epicoele, valve gap and valve body upper portion fixed connection, valve rod and case fixed connection, the intercommunication department of valve body and step-down piece is equipped with the disk seat, the epicoele of valve body and the circulation department of cavity of resorption are equipped with the step-down piece, be equipped with a plurality of alternately arranged's horizontal runner and longitudinal flow way in the step-down piece. The arrangement of the transverse flow channel and the longitudinal flow channel in the pressure reducing piece can guide a medium to enter the valve seat according to a specified direction, and is favorable for reducing the strong scouring of medium fluid on the valve core and the valve seat of the regulating valve under a low-flow working condition, so that the pressure reduction of low flow is effectively controlled, and the service life is prolonged.

Preferably, the cross-sectional areas of the transverse flow passages and the longitudinal flow passages are gradually increased. Along with the increase of the cross section areas of the transverse flow passage and the longitudinal flow passage, the pressure loss of the medium is gradually increased, and the flushing effect of the medium on the valve core and the valve seat before the medium enters the valve seat is reduced.

Preferably, the transverse flow channel is communicated with the longitudinal flow channel, the longitudinal flow channel is positioned at the end part of the transverse flow channel, and two longitudinal flow channels communicated with the same transverse flow channel are respectively arranged at two ends of the transverse flow channel. The medium flows through the two adjacent transverse flow channels in sequence through the longitudinal flow channels.

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 conical surface seal is formed between the valve core and the valve seat, the surface of the valve core contacting the valve seat is a valve core sealing surface, and the surface of the valve seat contacting the valve core is a valve seat sealing surface. The sealing area of the conical surface sealing is larger than that of the linear sealing, so that the leakage amount is reduced, and the sealing performance of the valve is improved.

Preferably, a gap is provided between a sealing surface between the valve element 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 bottom of the valve core is provided with an extension part, and the extension part comprises a cylindrical surface and an oblique conical surface. The flow direction of the inclined conical surface is consistent with that of the medium, the medium has the slightest scouring on the throttling channel, and the service life of the valve core can be prolonged to the maximum extent; along with the upward movement of the valve rod, the depth of the oblique conical surface is gradually increased, the flow area is also gradually increased, and the cylindrical surface is easy to accurately process, avoids medium erosion in use and is beneficial to further prolonging the whole service life of the valve.

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 invention has the following beneficial effects: (1) the arrangement of the transverse flow passage and the longitudinal flow passage in 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 conical surface sealing is arranged between the valve core and the valve seat, which is beneficial to reducing the leakage amount of a medium and improving the sealing property of the valve; (3) the inclined conical surface on the extension part at the bottom of the valve core is consistent with the flowing direction of the medium, the medium has the slightest scouring on the throttling channel, and the service life of the valve core can be prolonged to the maximum extent; the cylindrical surface is easy to process, and the whole service life of the valve is further prolonged.

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

Fig. 4 is a schematic view of the valve cartridge 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, a transverse flow channel, 202, a longitudinal 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, a valve core sealing surface, 502, an extension, 6, a valve rod, 7 and a valve cover.

Detailed Description

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

As shown in fig. 1 to 4, a pneumatic membrane pressure-reducing 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 fixedly connected with the upper part of the valve body 1, the valve rod 6 is fixedly connected with the valve core 5, a valve seat 3 is arranged at the communication position of the valve body 1 and a pressure-reducing piece 2, a pressure-reducing piece 2 is arranged at the communication position of the upper cavity 101 and the lower cavity 102 of the valve body 1, and a plurality of alternately arranged transverse flow channels 201 and longitudinal flow channels 202 are arranged in the pressure-reducing piece 2. The cross flow channels 201 and the total desired cross-sectional area 202 are gradually increased. The transverse runner 201 is communicated with the longitudinal runner 202, the longitudinal runner 202 is located at the end of the transverse runner 201, and two longitudinal runners 202 communicated with the same transverse runner 201 are respectively arranged at two ends of the transverse runner 201. The valve seat 3 is provided with a valve seat flow passage 302 for the inflow of a medium, and the outlet flow passage 203 on the pressure reduction member 2 is staggered with the valve seat flow passage 302. The valve comprises a valve body, a valve core 5, a valve seat 3 and a valve seat sealing surface 301, wherein the valve core 5 is in conical surface sealing with the valve seat 3, the surface of the valve core 5 contacting with the valve seat 3 is a valve core sealing surface 501, the surface of the valve seat 3 contacting with the valve core 5 is a valve seat sealing surface 301, and a gap is formed between the sealing surface between the valve core 5 and the valve seat 3 and a valve seat flow channel. The bottom of the valve core 5 is provided with an extension part 502, and the extension part 502 comprises a cylindrical surface and an oblique conical surface. 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 of making an uproar 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.

Preferably, the angle of the oblique conical surface on the extension part 502 of the valve core 5 can be processed according to the requirement, so as to meet the requirements of different working conditions. The flow direction of the inclined conical surface is consistent with that of the medium, the medium has the slightest scouring on the throttling channel, and the service life of the valve core can be prolonged to the maximum extent; along with the upward movement of the valve rod, the depth of the oblique conical surface is gradually increased, and the flow area is also gradually increased.

In use, the medium flows through the lower cavity 101 of the valve body 1, through the pressure reducing member 2, the valve seat 3, the noise reduction cage 4 and the upper cavity 102 of the valve body 1 in sequence. In the flowing process, on one hand, the medium flows along the longitudinal flow passage 201 and the transverse flow passage 202 in the pressure reducing member 2 and then enters the valve seat flow passage 302 from the outlet flow passage 203, wherein the cross-sectional areas of the transverse flow passage 202 and the longitudinal flow passage 202 are larger and larger, the pressure of the fluid is effectively reduced, and the outlet flow passage 203 and the valve seat flow passage 302 are staggered, so that the valve element 5 and the valve seat 3 are prevented from being washed by the medium. On the other hand, when the signal pressure received by the regulating valve is larger, the relative displacement between the valve core sealing surface 501 and the valve seat sealing surface 301 is larger, that is, the interception area between the inclined conical surface on the extension 502 of the valve core 5 and the valve seat flow passage 302 is larger; conversely, the smaller the signal pressure is, the smaller the relative displacement between the valve plug sealing surface 501 and the valve seat sealing surface 301 is, that is, the smaller the flow-stopping area between the tapered surface on the extension 502 of the valve plug 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.