CN213479305U

CN213479305U - Micro-pressure back pressure valve

Info

Publication number: CN213479305U
Application number: CN202022577829.1U
Authority: CN
Inventors: 张齐
Original assignee: Shanghai Longmeng Machinery Co ltd
Current assignee: Shanghai Longmeng Machinery Co ltd
Priority date: 2020-11-10
Filing date: 2020-11-10
Publication date: 2021-06-18
Anticipated expiration: 2030-11-10

Abstract

The application discloses a micro-pressure back pressure valve, which comprises a valve body, a diaphragm and a valve cover, wherein concave cavities are respectively arranged in the valve body and the valve cover, a water inlet flow passage and a water outlet flow passage are also arranged on the valve body, the water inlet flow passage and the water outlet flow passage are both communicated with the concave cavities in the valve body, a mounting disc is connected between the valve body and the valve cover, cavities are formed in the mounting disc, the cavities are respectively communicated with the two concave cavities, the diaphragm is mounted in the mounting disc to completely seal the cavities, the diameter of the diaphragm is larger than that of the valve body, and one side of the diaphragm close to the valve body is provided with a sealing body for sealing the water outlet flow passage, a concave cavity of the valve cover is internally provided with a spring seat and a compression spring, the compression spring is arranged in the spring seat, the side wall of the spring seat, which is far away from the compression spring, is propped against the diaphragm, and the telescopic direction of the compression spring is parallel to the direction that the spring seat is close to or far away from the diaphragm, and the valve cover is also provided with an adjusting mechanism for adjusting the prepressing force of the spring seat. This application has the effect that improves back pressure valve regulation precision.

Description

Micro-pressure back pressure valve

Technical Field

The application relates to the technical field of back pressure valves, in particular to a micro-pressure back pressure valve.

Background

The fluid inside the back pressure valve can build up a certain pressure, which is generally adjustable, due to the valve structure. The back pressure valve can be used for controlling the flow of various types of fluids such as air, water, steam, various corrosive media, slurry, oil products, liquid metal, radioactive media and the like. The pressure at the outlet of the back pressure valve is constant and the flow at the outlet is stable.

The existing back pressure valve comprises a valve cover, a diaphragm and a valve body which are connected in sequence, and further comprises a spring mechanism and an adjusting mechanism, wherein the valve cover and the valve body are provided with cavities, the valve body is provided with a water inlet and a water outlet, the diaphragm is embedded in the valve body, the spring mechanism is arranged in the cavity of the valve cover and is arranged at the upper end of the diaphragm, the adjusting mechanism is connected to the valve cover, the adjusting mechanism is arranged at the upper end of the spring mechanism, a water intercepting surface is arranged in the cavity of the valve body, and the valve body and the water intercepting surface are integrally formed.

When the back pressure valve is used, fluid enters from the water inlet of the back pressure valve and is blocked by the diaphragm, and then the fluid generates upward pressure on the diaphragm. When the pressure is high enough, the spring is compressed, and the fluid jacks up the diaphragm to form a channel and flows out of the water outlet of the backpressure valve; if the fluid pressure is not enough, a pressure building is formed, the inlet pressure is increased until the rated pressure is reached, and the diaphragm is jacked up to form a passage.

With respect to the related art in the above, the inventors have considered that there is a drawback that the back pressure valve adjustment accuracy is poor, and there is a point to be improved.

SUMMERY OF THE UTILITY MODEL

In order to improve the regulation precision of backpressure valve, this application provides a minute-pressure backpressure valve.

The application provides a minute-pressure back pressure valve adopts following technical scheme: comprises a valve body, a diaphragm and a valve cover, wherein concave cavities are arranged in the valve body and the valve cover, a water inlet flow passage and a water outlet flow passage are also arranged on the valve body, the water inlet flow passage and the water outlet flow passage are both communicated with a concave cavity in the valve body, an installation disc is connected between the valve body and the valve cover, a cavity is formed in the mounting disc and is respectively communicated with the two concave cavities, the diaphragm is mounted in the mounting disc to completely seal the cavity, the diameter of the diaphragm is larger than that of the valve body, and one side of the diaphragm close to the valve body is provided with a sealing body for sealing the water outlet flow passage, a concave cavity of the valve cover is internally provided with a spring seat and a compression spring, the compression spring is arranged in a spring seat, the side wall of the spring seat departing from the compression spring is propped against the diaphragm, and the telescopic direction of the compression spring is parallel to the direction that the spring seat is close to or far away from the diaphragm, and the valve cover is also provided with an adjusting mechanism for adjusting the prepressing force of the spring seat.

By adopting the technical scheme, during work, a worker firstly adjusts the pre-pressure of the back pressure valve by means of the adjusting mechanism; then the fluid medium enters the concave cavity on the valve body through the water inlet flow channel, the fluid medium in the concave cavity of the valve body generates upward pressure on the diaphragm, when the pressure is large enough, the compression spring is compressed, the fluid medium props open the diaphragm, so that the water outlet flow channel is opened, and then the fluid medium flows out through the water outlet flow channel; the water outlet flow channel is sealed by the aid of the diaphragm with the diameter larger than that of the valve body, the pressure of the fluid medium to the diaphragm is in direct proportion to the surface area of the diaphragm, the pressure intensity of the fluid medium in the cavity of the valve body is in inverse proportion to the surface area of the diaphragm, when the pressure intensity of the fluid medium changes, the larger the surface area of the diaphragm is, the larger the variation of the pressure intensity of the fluid medium to the diaphragm is, and therefore when workers adjust pre-pressure with the same variation, the larger the surface area of the diaphragm is, the smaller the variation of the pressure intensity of the fluid medium in the cavity of the valve body is, convenience of the workers in fine adjustment of the pressure intensity.

Preferably: the mounting disc includes disk body and lower disk body, the diaphragm sets up between last disk body and lower disk body, just the week side border position of mounting disc still is provided with locking bolt and lock nut, locking bolt wears to establish disk body, diaphragm and lower disk body in proper order, lock nut screw-thread fit is at locking bolt's screw thread tip, just lock nut supports tightly on the lateral wall that the disk body deviates from last disk body under.

Through adopting above-mentioned technical scheme, fix the diaphragm in the mounting disc with the help of locking bolt and lock nut cooperation, help improving the convenience that the diaphragm was installed in the mounting disc.

Preferably: one side of the diaphragm close to the valve cover is provided with a metal pressing sheet, and the metal pressing sheet is completely attached to the side wall of the diaphragm close to the valve cover.

Through adopting above-mentioned technical scheme, with the help of the metal preforming of setting on the diaphragm, help reducing the deflection that the pressure that fluid medium produced caused to the diaphragm, and then help improving the stability that fluid medium flows out valve body flow.

Preferably: the compression spring is provided with the spring holder, and the adjustment mechanism includes adjusting screw and fastening nut, adjusting screw wears to establish the valve gap and rather than screw-thread fit, just adjusting screw's screw tip stretches into the cavity on the valve gap and supports tightly on compressing tightly the seat, fastening nut screw-thread fit is on adjusting screw, just fastening nut supports tightly on the valve gap.

Through adopting above-mentioned technical scheme, in the work, the staff unscrews lock nut earlier, rotates adjusting screw again to make adjusting screw move to the one side that is close to or keeps away from compression spring on the valve gap, thereby adjust the pretightning force of back pressure valve, and then help improving the pressure that the staff adjusted the back pressure valve.

Preferably: the side wall of the pressing seat, which is far away from the spring seat, is provided with an embedded groove, a steel ball is embedded in the embedded groove, the steel ball is in running fit with the embedded groove, and the adjusting screw is tightly abutted to the steel ball.

Through adopting above-mentioned technical scheme, with the help of inlaying the steel ball of establishing on compressing tightly the seat, help reducing adjusting screw and compress tightly the frictional force of seat to help reducing and compress tightly the seat and produce the condition emergence of relative rotation with compression spring.

Preferably: the valve body is in threaded connection with the mounting disc, a sealing boss is arranged on one side, close to the mounting disc, of the valve body, an annular sealing ring is arranged on the sealing boss, and the outer wall of the mounting disc abuts against the sealing boss tightly.

Through adopting above-mentioned technical scheme, with the help of the ring type sealing washer of setting between valve body and mounting disc, help improving the leakproofness that valve body and mounting disc are sealed.

Preferably: the sealing boss is provided with an installation groove, and the annular sealing ring is embedded in the installation groove.

Through adopting above-mentioned technical scheme, inlay with the help of the mounting groove and establish the ring type sealing washer, help reducing the ring type sealing washer and deviate from the condition emergence of sealed boss.

Preferably: the port department that goes out the water flow channel and be located the valve body cavity is fixed with the sealing washer, the sealing washer seals the port that goes out the water flow channel and be located the valve body cavity with the seal cooperation.

Through adopting above-mentioned technical scheme, seal the port that goes out the water flow way and be located the valve body cavity with the help of sealing washer and seal cooperation, help improving the compactness that the sealed water flow way of diaphragm goes out.

In summary, the present application includes at least one of the following beneficial technical effects:

(1) the water outlet flow channel is sealed by the aid of the diaphragm with the diameter larger than that of the valve body, when the pressure intensity of the fluid medium changes, the larger the surface area of the diaphragm is, the larger the variation of the pressure of the fluid medium on the diaphragm is, and therefore when workers adjust pre-pressure with the same variation, the larger the surface area of the diaphragm is, the smaller the variation of the pressure intensity of the fluid medium in the cavity of the valve body is, so that convenience of the workers in fine adjustment of the pressure intensity of the fluid medium in the cavity of the valve body is improved, and adjustment accuracy of the back;

(2) through the cooperation of the mounting groove of seting up on the annular seal circle and the sealed boss, help improving the sealed compactness of valve body and mounting disc junction.

Drawings

FIG. 1 is a schematic view of an embodiment of the present application, which mainly shows the overall structure of a back pressure valve;

FIG. 2 is a schematic cross-sectional view of an embodiment of the present application, which mainly shows the overall structure of a back pressure valve;

fig. 3 is an enlarged view of a portion a of fig. 2, which mainly shows a sealing structure between the lower disc and the valve body.

Reference numerals: 1. a valve body; 11. a water inlet flow channel; 12. a water outlet flow channel; 13. sealing the boss; 14. mounting grooves; 15. an annular seal ring; 16. a seal ring; 17. a water inlet pipe; 18. a water outlet pipeline; 19. a mounting seat; 191. mounting holes; 2. a membrane; 21. metal tabletting; 22. fixing the bolt; 23. fixing a nut; 24. a seal body; 25. smooth surface; 3. a valve cover; 31. a spring seat; 32. a compression spring; 33. a pressing seat; 331. a groove is embedded; 332. steel balls; 4. a concave cavity; 5. mounting a disc; 51. an upper tray body; 52. a lower tray body; 53. locking the bolt; 54. locking the nut; 55. an installation port; 6. an adjustment mechanism; 61. adjusting the screw rod; 62. fastening a nut; 7. a cavity.

Detailed Description

The present application is described in further detail below with reference to the accompanying drawings.

The embodiment of the application discloses a minute-pressure back pressure valve. Referring to fig. 1, the micro-pressure back pressure valve comprises a valve body 1, a diaphragm 2 and a valve cover 3, wherein the valve body 1 and the valve cover 3 are both cylindrical, and cavities 4 are formed in the valve body 1 and the valve cover 3. The valve body 1 is further provided with a water inlet flow passage 11 and a water outlet flow passage 12, and the water inlet flow passage 11 and the water outlet flow passage 12 are communicated with the concave cavity 4 in the valve body 1. Be connected with mounting disc 5 between valve body 1 and the valve gap 3, be formed with cavity 7 in the mounting disc 5, cavity 7 communicates with two cavities 4 respectively, and diaphragm 2 is installed in mounting disc 5 and separates two cavities 4.

Referring to fig. 2 and 3, the mounting plate 5 includes an upper plate body 51 and a lower plate body 52, the diameters of the upper plate body 51 and the lower plate body 52 are three times the diameter of the valve body 1, the cavity 7 is formed by the upper plate body 51 and the lower plate body 52 in a matching manner, the diaphragm 2 is arranged between the upper plate body 51 and the lower plate body 52, and the diameter of the diaphragm 2 is slightly smaller than that of the upper plate body 51. The diaphragm 2 is arranged between the upper disc body 51 and the lower disc body 52, the mounting disc 5 is further provided with a locking bolt 53 and a locking nut 54, the locking bolt 53 sequentially penetrates through the upper disc body 51, the diaphragm 2 and the lower disc body 52, the locking nut 54 is in threaded fit with the threaded end portion of the locking bolt 53, the locking nut 54 abuts against the side wall, far away from the upper disc body 51, of the lower disc body 52, and in order to improve the connection tightness of the lower disc body 52 and the upper disc body 51, the locking bolt 53 and the locking nut 54 are arranged on the peripheral side edge of the mounting disc 5 at equal intervals.

The upper disc body 51 and the lower disc body 52 are coaxially provided with mounting openings 55, and the valve body 1 and the valve cover 3 are respectively in threaded connection with the corresponding mounting openings 55. In order to improve the sealing performance of the joint of the valve body 1 and the mounting disc 5, a sealing boss 13 is arranged on the outer side wall of the valve body 1 along the axis of the valve body 1 around the periphery of the valve body 1, a mounting groove 14 is arranged on the sealing boss 13, an annular sealing ring 15 is embedded in the mounting groove 14, and the mounting disc 5 abuts against the sealing boss 13 close to the side wall of the valve body 1.

Referring to fig. 1 and 2, a metal pressing sheet 21 is installed on one side of the diaphragm 2 away from the valve body 1, the metal pressing sheet 21 is disc-shaped, and the metal pressing sheet 21 is made of stainless steel. The metal pressing sheet 21 is completely attached to the side wall of the diaphragm 2 close to the valve cover 3, and the metal pressing sheet 21 is located in the middle of the diaphragm 2. The central position of the diaphragm 2 is also provided with a fixing bolt 22, the fixing bolt 22 sequentially penetrates through the diaphragm 2 and the metal pressing sheet 21, the end part of the fixing bolt 22 is in threaded fit with a fixing nut 23, and the fixing nut 23 is abutted against the metal pressing sheet 21. And one end of the fixing bolt 22 departing from the fixing nut 23 is integrally formed with a sealing body 24, a sealing ring 16 is embedded in the port of the water outlet flow channel 12 located in the cavity 4 of the valve body 1, and the sealing body 24 abuts against the sealing ring 16 and is matched with the sealing ring 16 to completely seal the port of the water outlet flow channel 12 located in the cavity 4. The outer surface of the sealing body 24 in contact with the sealing ring 16 is treated to be a smooth flat surface 25, which helps to improve the sealing effect of the sealing body 24 and the sealing ring 16.

Referring to fig. 1 and 2, a water inlet pipe 17 and a water outlet pipe 18 are further welded and fixed on the valve body 1, the water inlet pipe 17 is communicated with the water inlet runner 11, the water outlet pipe 18 is communicated with the water outlet runner 12, mounting seats 19 are welded and fixed at one ends, far away from the valve body 1, of the water inlet pipe 17 and the water outlet pipe 18, the two mounting seats 19 are disc-shaped, mounting holes 191 are formed in the two mounting seats 19, and the four mounting holes 191 are formed in the two mounting seats 19 and are arranged around the axes of the two mounting seats 19 at equal intervals.

A spring seat 31 and a compression spring 32 are arranged in the cavity 4 in the valve cover 3, one end, close to the diaphragm 2, of the compression spring 32 is fixedly connected with the spring seat 31 in a welding mode, the expansion direction of the compression spring 32 is parallel to the direction, close to or far away from the diaphragm 2, of the spring seat 31, and the side wall, away from the compression spring 32, of the spring seat 31 abuts against the end portion of the thread of the fixing bolt 22. The compression spring 32 is far away from the one end of spring holder 31 and is installed and compress tightly seat 33, and compress tightly seat 33 and put on compression spring 32, and has seted up embedded groove 331 on compressing tightly the lateral wall that seat 33 deviates from spring holder 31, and the embedded steel ball 332 that is equipped with of embedded groove 331, steel ball 332 and embedded groove 331 normal running fit.

The valve cover 3 is further provided with an adjusting mechanism 6, the adjusting mechanism 6 comprises an adjusting screw 61 and a fastening nut 62, the length direction of the adjusting screw 61 is parallel to the telescopic direction of the compression spring 32, the adjusting screw 61 penetrates through the valve cover 3 and is in threaded fit with the valve cover 3, and the threaded end of the adjusting screw 61 extends into the cavity 4 on the valve cover 3 and abuts against the steel ball 332. The fastening nut 62 is screwed on the adjusting screw 61, and the fastening nut 62 abuts against the side wall of the bonnet 3 facing away from the valve body 1. When the pretightening force of the compression spring 32 is adjusted by rotating the adjusting screw 61, the steel balls 332 arranged between the adjusting screw 61 and the pressing seat 33 reduce the relative rotation between the pressing seat 33 and the compression spring 32.

The implementation principle of this application embodiment minute-pressure back pressure valve does: during work, a worker firstly installs the metal pressing sheet 21 on the diaphragm 2 through the fixing bolt 22 and the fixing nut 23 in a matching mode, then installs the diaphragm 2 in the installation disc 5, then fixedly connects the valve body 1 with the installation disc 5, then installs the valve cover 3 provided with the adjusting mechanism 6 and the compression spring 32 on the installation disc 5, and abuts against the spring seat 31 at the end part of the thread of the fixing bolt 22; when the back pressure valve works, a fluid medium flows into the cavity 4 on the valve body 1 from the water inlet flow channel 11, when the pressure of the fluid medium on the diaphragm 2 in the cavity 4 can overcome the pretightening force applied on the diaphragm 2 by the compression spring 32, the fluid medium props open the diaphragm 2, and the fluid medium flows out from a port of the water outlet flow channel 12 in the cavity 4 of the valve body 1.

It is above only the utility model discloses a preferred embodiment, the utility model discloses a scope of protection does not only confine above-mentioned embodiment, the all belongs to the utility model discloses a technical scheme under the thinking all belongs to the utility model discloses a scope of protection. It should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. The micro-pressure back pressure valve is characterized by comprising a valve body (1), a diaphragm (2) and a valve cover (3), wherein concave cavities (4) are formed in the valve body (1) and the valve cover (3), a water inlet flow channel (11) and a water outlet flow channel (12) are further formed in the valve body (1), the water inlet flow channel (11) and the water outlet flow channel (12) are communicated with the concave cavities (4) in the valve body (1), an installation disc (5) is connected between the valve body (1) and the valve cover (3), a cavity (7) is formed in the installation disc (5), the cavity (7) is communicated with the two concave cavities (4) respectively, the diaphragm (2) is installed in the installation disc (5) to completely seal the cavity (7), the diameter of the diaphragm (2) is larger than that of the valve body (1), and a sealing body (24) for sealing the water outlet flow channel (12) is arranged on one side, close to the valve body (1), of the diaphragm (2), be provided with spring holder (31) and compression spring (32) in cavity (4) of valve gap (3), compression spring (32) are installed in spring holder (31), the lateral wall that spring holder (31) deviates from compression spring (32) supports on diaphragm (2), just compression spring (32) flexible direction is on a parallel with the direction that spring holder (31) are close to or keep away from diaphragm (2), still be provided with adjustment mechanism (6) that are used for adjusting spring holder (31) pre-pressure on valve gap (3).

2. The backpressure valve according to claim 1, wherein the mounting disc (5) comprises an upper disc body (51) and a lower disc body (52), the diaphragm (2) is arranged between the upper disc body (51) and the lower disc body (52), a locking bolt (53) and a locking nut (54) are further arranged at the peripheral side edge position of the mounting disc (5), the locking bolt (53) sequentially penetrates through the upper disc body (51), the diaphragm (2) and the lower disc body (52), the locking nut (54) is in threaded fit with the threaded end portion of the locking bolt (53), and the locking nut (54) abuts against the side wall of the lower disc body (52) departing from the upper disc body (51).

3. A micro-pressure back pressure valve according to claim 1, characterized in that the side of the diaphragm (2) close to the valve cover (3) is provided with a metal pressing sheet (21), and the metal pressing sheet (21) is completely attached to the side wall of the diaphragm (2) close to the valve cover (3).

4. The micro-pressure back pressure valve according to claim 1, wherein a compression seat (33) is arranged at one end of the compression spring (32) far away from the spring seat (31), the adjusting mechanism (6) comprises an adjusting screw rod (61) and a fastening nut (62), the adjusting screw rod (61) penetrates through the valve cover (3) and is in threaded fit with the valve cover, the threaded end part of the adjusting screw rod (61) extends into the cavity (4) on the valve cover (3) and abuts against the compression seat (33), the fastening nut (62) is in threaded fit with the adjusting screw rod (61), and the fastening nut (62) abuts against the valve cover (3).

5. The micro-pressure back pressure valve according to claim 4, wherein an embedded groove (331) is formed in a side wall of the pressing seat (33) away from the spring seat (31), a steel ball (332) is embedded in the embedded groove (331), the steel ball (332) is in running fit with the embedded groove (331), and the adjusting screw rod (61) abuts against the steel ball (332).

6. The micro-pressure back pressure valve according to claim 1, characterized in that the valve body (1) is in threaded connection with the mounting disc (5), a sealing boss (13) is arranged on one side of the valve body (1) close to the mounting disc (5), an annular sealing ring (15) is arranged on the sealing boss (13), and the outer wall of the mounting disc (5) abuts against the sealing boss (13).

7. The micro-pressure back pressure valve according to claim 6, wherein the sealing boss (13) is provided with an installation groove (14), and the annular sealing ring (15) is embedded in the installation groove (14).

8. The backpressure valve according to claim 1, characterized in that a sealing ring (16) is fixed at the port of the outlet flow channel (12) located in the cavity (4) of the valve body (1), and the sealing ring (16) and the sealing body (24) are matched to seal the port of the outlet flow channel (12) located in the cavity (4) of the valve body (1).