CN218670736U

CN218670736U - Diaphragm assembly and pressure control valve

Info

Publication number: CN218670736U
Application number: CN202222971073.8U
Authority: CN
Inventors: 宁立文; 黄文强; 罗飞达; 章文婷
Original assignee: South China Lantian Aviation Oil Co ltd Guangxi Branch; South China Lantian Aviation Fuel Co ltd
Current assignee: South China Lantian Aviation Oil Co ltd Guangxi Branch; South China Lantian Aviation Fuel Co ltd
Priority date: 2022-11-04
Filing date: 2022-11-04
Publication date: 2023-03-21
Anticipated expiration: 2032-11-04

Abstract

The utility model discloses a diaphragm group, including balanced diaphragm and diaphragm bolt, balanced diaphragm's center is equipped with the confession diaphragm bolt male through-hole, the diaphragm bolt includes head and pole portion, pole portion is including being close to the seal segment of head one end and the screw thread section that is located the other end, the periphery lateral wall surface of seal segment is smooth, be equipped with the screw thread on the periphery lateral wall of screw thread section. The utility model also discloses a pressure control valve. The utility model discloses can make the connecting gap between diaphragm bolt and the balanced diaphragm littleer, the sealing performance of balanced diaphragm subassembly of reinforcing, oil and gas are revealed each other between the grease chamber of avoiding balanced diaphragm both sides and the air chamber and are flowed and scurry the inefficacy that causes balanced diaphragm, lead to the incident such as unable oiling or oil seepage, reduce the maintenance number of times of pressure control valve simultaneously, save time and cost.

Description

Diaphragm assembly and pressure control valve

Technical Field

The utility model relates to a pressure control valve technical field, more specifically relates to a diaphragm assembly and pressure control valve.

Background

At present, most of large airports adopt a plateau pipe network refueling mode, a plateau pipe network is laid under the ground of a terrace, a ground well bolt is arranged at the position, close to the bottom surface, of the plateau pipe network, when a plane is refueled, a pipeline refueling truck is usually driven to the position close to the plane needing refueled operation, one end of a refueling pipeline on the refueling pipeline truck is connected with a plane refueling port, the other end of the refueling pipeline is connected with the ground well bolt, and the refueling pump on the refueling pipeline truck pumps aviation oil in the plateau pipe network into a plane oil tank to finish the plane refueling operation.

And a ground well joint is arranged at one end of the oil filling pipeline on the oil filling pipeline vehicle, which is connected with the ground well bolt, and the ground well joint is quickly connected with the ground well bolt. Whether the ground well joint works normally or not is directly related to flight operation guarantee safety. The ground well joint is provided with a pressure control valve which can provide constant aviation oil pressure under different flow rates. In the pressure control valve, one side of the balance diaphragm is an oil chamber, the other side of the balance diaphragm is an air chamber, one side provided with the oil chamber is simultaneously provided with a spring, and pressure control is realized according to pressure balance on two sides of the balance diaphragm.

However, in the existing field operation, the situation that oil leaks from the hydraulic side to the air pressure side of the balance diaphragm frequently occurs in the pressure control valve, so that the balance diaphragm fails, safety accidents such as incapability of refueling or oil leakage occur, flight delay is caused by influencing refueling operation of an airplane after the pressure control valve fails, and the maintenance cost is high. Upon inspection, the location of the leak is typically in the gap between the original diaphragm bolt in the balancing diaphragm and the balancing diaphragm.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome prior art ground well joint pressure control valve and appear the oil seepage easily and cause balanced diaphragm to realize leading to the oil seepage and refuel the not enough that the operation is delayed, provide a diaphragm assembly and a pressure control valve. The utility model discloses can make the connecting gap between diaphragm bolt and the balanced diaphragm littleer, the sealing performance of balanced diaphragm subassembly of reinforcing, oil and gas are revealed each other between the grease chamber of avoiding balanced diaphragm both sides and the air chamber and are flowed and scurry the inefficacy that causes balanced diaphragm, lead to the incident such as unable oiling or oil seepage, reduce the maintenance number of times of pressure control valve simultaneously, save time and cost.

The purpose of the utility model can be achieved by adopting the following technical scheme:

the utility model provides a diaphragm group, includes balanced diaphragm and diaphragm bolt, the center of balanced diaphragm is equipped with the confession diaphragm bolt male through-hole, the diaphragm bolt includes head and pole portion, pole portion is including being close to the sealed section of head one end and the screw thread section that is located the other end, the periphery lateral wall surface of sealed section is smooth, be equipped with the screw thread on the periphery lateral wall of screw thread section.

Diaphragm bolt among the prior art is full tooth bolt, and at the in-process of in-service use, full tooth bolt inserts the back, has certain clearance between screw thread and the through-hole, leads to the oil and the gas of balanced diaphragm both sides to flow each other along the thread gap and scurries, causes the inefficacy of balanced diaphragm to cause can't refuel and delay the incident such as aircraft take off or oil seepage. In order to avoid the emergence of seepage book, use half tooth bolt as the diaphragm bolt, the pole portion is close to head one end be equipped with the screw thread for the smooth sealed section in surface for the periphery lateral wall, the external diameter of sealed section is not less than the external diameter of screw thread section, the external diameter of sealed section with the internal diameter of through-hole is mutually supported for behind the diaphragm bolt inserted the through-hole, the laminating as far as possible of the periphery lateral wall of linkage segment and the interior lateral wall of through-hole reduces the gap, and simultaneously, the smooth even linkage segment of periphery lateral wall is bigger with the area of contact of the interior lateral wall of through-hole, and at the in-process that deformation and removal take place in the balanced diaphragm removal, the diaphragm bolt with balanced diaphragm between be connected more firmly be difficult to take place relative displacement. And when the deformation and the movement of the balance diaphragm of the common bolt with the full thread are carried out, a larger gap exists between the common bolt and the through hole due to small contact area and the existence of the threads, the common bolt and the balance diaphragm are easy to generate relative displacement and the threads on the peripheral side wall of the common bolt are easy to wear, and then the leakage between the oil chamber and the air chamber is caused by more solution. Therefore, use the utility model discloses a diaphragm assembly, greatly reduced the trouble that reduces the diaphragm inefficacy take place, reduce the maintenance number of times of pressure control valve, save time and cost.

Furthermore, a first gasket is sleeved on the sealing section and arranged between the rod part and the balance diaphragm.

The utility model discloses a diaphragm group is when using, the diaphragm bolt is inserting after the balanced diaphragm, the screw thread section need with the piston fixed connection of pressure control valve. The sealing section is sleeved with a first gasket, the first gasket is arranged between the balance diaphragm and the head of the diaphragm bolt, when the threaded section of the diaphragm bolt is connected with a piston of the pressure control valve, the head of the diaphragm bolt is gradually close to the balance diaphragm, so that the first gasket is clamped by the balance diaphragm and the head, the through hole is further sealed, and the balance diaphragm is further prevented from losing efficacy due to the fact that oil and gas flow between the oil chamber and the gas chamber flees to the other side.

Furthermore, the first gasket comprises an annular inner ring and an outer ring arranged on the side wall of the periphery of the inner ring, the inner ring is made of rubber, and the outer ring is made of corrosion-resistant steel.

The inner ring of the first gasket is made of elastic rubber and plays a role in sealing, and the outer ring of the first gasket is made of corrosion-resistant metal. The inner ring is made of the elastic material, the outer ring is made of the hard material, the first composite gasket has the advantages that the elastic sealing effect is better, the outer hard material is sealed, and leakage caused by the sealing performance after the elastic material is aged and subjected to plastic deformation can be avoided.

Further, the diaphragm presss from both sides including the first clamping piece and the second clamping piece that stack, the through-hole is including being located the first centre bore of first clamping piece centre of a circle department and being located the second centre bore of second clamping piece centre of a circle department, elastic diaphragm is held between first clamping piece and the second clamping piece, all be equipped with a plurality of first fixed orificess along the circumference on the first clamping piece, be equipped with a plurality of thick second fixed orificess along the circumference on the elastic diaphragm, evenly be equipped with a plurality of screws along the circumference on the second clamping piece, the position of first fixed orificess, second fixed orificess and screw corresponds each other, first fixed orificess, second fixed orificess and screw interpolation are equipped with fixing bolt.

The axes of the first clamping piece, the elastic membrane and the second clamping piece are all located on the same straight line and are sequentially stacked, the first center hole and the second center hole are used for inserting the membrane bolt, the fixing bolt is inserted into the first fixing hole, the second fixing hole and the screw hole at one time, and the fixing bolt is pre-tightened to enable the elastic membrane to be only clamped between the first clamping piece and the second clamping piece and enable the membrane clamp to be in sealing connection with the elastic membrane.

Furthermore, the second clamping piece is provided with an annular bulge on the end face opposite to the other end of the first clamping piece, the screw hole is located at one end of the second clamping piece close to the first clamping piece, the screw hole is located in the annular bulge, and the screw hole is a blind hole.

In this scheme, the reaming in the second clamping piece is the blind hole, and like this, the second clamping piece is on an terminal surface that faces the grease chamber, and the annular arch is confined, is in order to reduce the gap of intercommunication between the balanced diaphragm both sides like this to reduce the leak source, improve balanced diaphragm's leakproofness.

Furthermore, the annular bulge is arranged at the position, close to the outer edge, of the second clamping piece, and an annular groove is formed in the position, close to the second central hole, of the end face of the second clamping piece.

The annular groove may be used to house a spring when the diaphragm assembly is installed in a pressure control valve.

Further, fixing bolt includes head of a screw portion and screw rod portion, the cover is equipped with the second gasket on the screw rod, the second gasket is located screw rod portion with between the first clamping piece.

The structure of fixing bolt can with diaphragm bolt structure is similar, for half tooth bolt, the screw rod portion is close to the periphery lateral wall surface of the one end of screw head portion is smooth, be equipped with the screw thread on the periphery lateral wall of the other end of screw rod portion. The second gasket may have a structure similar to the first gasket, with the inner ring being rubber and the outer ring being steel. Can guarantee like this with the leakproofness between the first clamping piece, avoid oil or gas to flow out from the gap between bolt and the first fixed orifices and the gap between diaphragm clamp and the elastic diaphragm.

The utility model provides a pressure control valve, includes diaphragm assembly, casing, locates end cover on the casing and locating piston in the casing, the screw thread section of diaphragm bolt with the piston rod threaded connection of piston, be located in the casing balanced diaphragm with space between the end cover is the air chamber, be located in the casing balanced diaphragm with space between the piston is the grease chamber, the cover is equipped with the spring on the piston rod of piston, spring one end butt is in on the balanced diaphragm, other end butt is in on the piston, even there is the oil pressure feedback pipe in the grease chamber.

One side of the piston is an oil chamber, a space between the other side of the piston and the shell is an oil chamber, when the pressure control valve is opened, oil is conveyed from the oil chamber through the oil chamber, and when the pressure control valve is closed, the piston blocks a passage of the oil chamber to cut off the conveying of the oil. And a pressure control valve of the ground well joint is connected with the dead man and used for controlling the opening and closing of the ground well joint. The dead demann is connected with the air chamber, the dead demann is started to inflate the air chamber when the pressure control valve needs to be opened, the pressure in the air chamber is increased, and therefore the spring is pushed to compress the piston to move, the oil chamber is communicated with an oil path for conveying oil to convey the oil, and meanwhile the oil chamber is communicated with the oil path through an oil pressure feedback pipeline. When the oil pressure in the oil path is increased, the sum of the oil pressure in the oil chamber and the spring pressure is larger than the air pressure in the air chamber, so that the piston is reset to block the oil chamber, the pressure control valve is closed, and pressure control is realized. After the oil transportation operation is normally finished, the dead man is closed, the pressure of the air chamber is reduced, the spring pressure in the oil chamber enables the piston to automatically reset, and the pressure control valve is closed.

Furthermore, the piston rod of the piston is sleeved with two springs, the two springs comprise a first spring and a second spring, and the inner diameter of the second spring is larger than the outer diameter of the first spring, and the second spring is sleeved on the periphery of the first spring.

The first spring may be disposed in an annular groove in the second clip. The annular groove is arranged on the inner ring of the end face of the second clamping piece, the annular bulge is arranged on the outer ring of the end face of the second clamping piece, and therefore the second spring can be arranged on the end face of the second clamping piece between the annular groove and the annular bulge.

Compared with the prior art, the beneficial effects of the utility model are that:

(1) The sealing section surface of the diaphragm bolt is smooth and flat, so that a connecting gap between the diaphragm bolt and the through hole of the balance diaphragm is smaller, and the sealing performance of the balance diaphragm assembly is enhanced. Meanwhile, the contact area between the surface of the sealing section and the inside of the through hole is larger, so that the diaphragm bolt and the balance diaphragm are more stably connected. Therefore, safety accidents such as incapability of oiling or oil leakage and the like caused by the failure of the balance diaphragm due to mutual leakage and flow of oil and gas between the oil chamber and the gas chamber on two sides of the balance diaphragm are avoided.

(2) The inner ring is a first gasket made of steel and the rubber outer ring, so that the first gasket has the advantages of elastic sealing and mechanical sealing, and the sealing performance between the bolt and the first clamping piece is further improved.

(3) The screw hole of second clamping piece is the blind hole, reduces the through-hole of intercommunication between the balanced diaphragm both sides, just fixing bolt's structure is similar with balancing bolt's structure, and the structure of second gasket is similar with the structure of first gasket for balanced diaphragm's leakproofness is better.

(4) The maintenance frequency of the pressure control valve of the diaphragm assembly is reduced, and time and cost are saved.

(5) The spring in the pressure control valve can abut against the groove of the second clamping piece and the end face of the second clamping piece between the annular groove and the annular bulge, so that the spring is easier to position and install.

Drawings

Fig. 1 is a schematic view of the overall structure of the diaphragm assembly of the present invention;

fig. 2 is a schematic view of the overall structure of the diaphragm assembly at another viewing angle;

fig. 3 is a schematic view of the overall structure of the diaphragm assembly according to another view angle of the present invention;

FIG. 4 is a schematic structural view of the elastic diaphragm of the present invention;

fig. 5 is a schematic structural view of the first clamping piece of the present invention;

fig. 6 is a schematic structural view of a second clip of the present invention;

fig. 7 is a schematic view of another view of the second clip of the present invention;

fig. 8 is a schematic structural view of the diaphragm bolt of the present invention;

fig. 9 is a schematic structural view of the pressure control valve of the present invention when closed;

fig. 10 is a schematic structural view of the pressure control valve according to the present invention when opened.

The graphic symbols are illustrated as follows:

1-balance diaphragm, 11-through hole, 2-diaphragm bolt, 21-head, 22-rod, 221-sealing segment, 222-thread segment, 4-elastic diaphragm, 41-second fixing hole, 5-diaphragm clamp, 51-first clamping piece, 511-first fixing hole, 512-first central hole, 52-second clamping piece, 521-annular protrusion, 522-annular groove, 523-second central hole, 524-blind hole, 53-fixing bolt, 6-shell, 61-end cover, 7-piston, 71-piston rod, 81-air chamber, 82-oil chamber, 83-oil pressure feedback tube, 84-air port, 91-first spring and 92-second spring.

Detailed Description

The present invention will be further described with reference to the following embodiments. Wherein the showings are for the purpose of illustration only and are shown by way of illustration only and not in actual form, and are not to be construed as limiting the present patent; for a better understanding of the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if there are the terms "upper", "lower", "left", "right", etc. indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of the description, but it is not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore the terms describing the positional relationship in the drawings are only for illustrative purposes and are not to be construed as limitations of the present patent, and those skilled in the art can understand the specific meanings of the terms according to specific situations.

Example 1

As shown in fig. 1 to 4, a diaphragm set comprises a balance diaphragm 1 and a diaphragm bolt 2, wherein a through hole 11 for inserting the diaphragm bolt 2 is formed in the center of the balance diaphragm 1, the diaphragm bolt 2 comprises a head portion 21 and a rod portion 22, the rod portion 22 comprises a sealing section 221 close to one end of the head portion 21 and a threaded section 222 located at the other end, the surface of the peripheral side wall of the sealing section 221 is smooth, and threads are formed on the peripheral side wall of the threaded section 222.

Diaphragm bolt 2 among the prior art is full tooth bolt, and at the in-process of in-service use, full tooth bolt inserts the back, has certain clearance between screw thread and the through-hole 11, leads to the oil and the gas of balanced diaphragm 1 both sides to flow scurrying each other along the screw thread gap, causes balanced diaphragm 1's inefficacy to cause can't refuel and delay incident such as aircraft take-off or oil seepage. In order to avoid the occurrence of leakage books, a half-thread bolt is used as the diaphragm bolt 2, one end of the rod part 22, which is close to the head part 21, is provided with a sealing section 221 with smooth surface, which is not provided with threads on the outer peripheral side wall, the outer diameter of the sealing section 221 is not smaller than the outer diameter of the thread section 222, the outer diameter of the sealing section 221 is matched with the inner diameter of the through hole 11, so that after the diaphragm bolt 2 is inserted into the through hole 11, the outer peripheral side wall of the connecting section is attached to the inner peripheral side wall of the through hole 11 as much as possible, gaps are reduced, meanwhile, the contact area between the smooth and flat connecting section of the outer peripheral side wall and the inner peripheral side wall of the through hole 11 is larger, and in the process that the diaphragm bolt 2 is connected with the balance diaphragm 1 more stably and is not easy to generate relative displacement when the balance diaphragm 1 moves. When the balance diaphragm 1 deforms and moves, the common bolt with the full thread has a large gap between the common bolt and the through hole 11 due to small contact area and the existence of threads, the common bolt and the balance diaphragm 1 are easy to generate relative displacement and the threads on the peripheral side wall of the common bolt are easy to wear, and further, the leakage between the oil chamber 82 and the air chamber 81 is caused by more solution. Therefore, use the utility model discloses a diaphragm assembly, greatly reduced the trouble that reduces the diaphragm inefficacy and taken place, reduce the maintenance number of times of pressure control valve, save time and cost.

The sealing section 221 is sleeved with a first gasket, and the first gasket is arranged between the rod part 22 and the balance diaphragm 1.

The utility model discloses a diaphragm group is when using, and diaphragm bolt 2 is inserting balanced diaphragm 1 after, screw thread section 222 needs with pressure control valve's piston 7 fixed connection. The first gasket is sleeved on the sealing section 221 and is arranged between the balance diaphragm 1 and the head 21 of the diaphragm bolt 2, when the threaded section 222 of the diaphragm bolt 2 is connected with the piston 7 of the pressure control valve, the head 21 of the diaphragm bolt 2 is gradually close to the balance diaphragm 1, so that the first gasket is clamped by the balance diaphragm 1 and the head 21, the through hole 11 is further sealed, and the phenomenon that the balance diaphragm 1 fails due to the fact that oil and gas between the oil chamber 82 and the gas chamber 81 flow to the other side is further avoided.

The first gasket comprises an annular inner ring and an outer ring arranged on the peripheral side wall of the inner ring, the inner ring is made of rubber, and the outer ring is made of corrosion-resistant steel.

Example 2

The present embodiment includes the following features in addition to the features of embodiment 1:

as shown in fig. 5 to 8, the membrane clamp 5 includes a first clamping piece 51 and a second clamping piece 52 which are stacked, the through hole 11 includes a first center hole 512 located at a center of the first clamping piece 51 and a second center hole 523 located at a center of the second clamping piece 52, the elastic membrane 4 is clamped between the first clamping piece 51 and the second clamping piece 52, the first clamping piece 51 is circumferentially provided with a plurality of first fixing holes 511, the elastic membrane 4 is circumferentially provided with a plurality of second fixing holes 41 which are thick, the second membrane is circumferentially provided with a plurality of screw holes, the first fixing holes 511, the second fixing holes 41 and the screw holes are mutually corresponding in position, and fixing bolts 53 are inserted into the first fixing holes 511, the second fixing holes 41 and the screw holes.

The axes of the first clamping piece 51, the elastic diaphragm 4 and the second clamping piece 52 are all located on the same straight line and are stacked in sequence, the first central hole 512 and the second central hole 523 are used for inserting the diaphragm bolt 2, the fixing bolt 53 is inserted into the first fixing hole 511, the second fixing hole 41 and the screw hole at a time, and the fixing bolt 53 is pre-tightened so that the elastic diaphragm 4 is clamped between the first clamping piece 51 and the second clamping piece 52 only and the diaphragm clamp 5 is in sealing connection with the elastic diaphragm 4.

The end surface of the second clamping piece 52 opposite to the other end of the first clamping piece 51 is provided with an annular bulge 521, a screw hole is positioned at one end of the second clamping piece 52 close to the first clamping piece 51, the screw hole is positioned in the annular bulge 521, and the screw hole is a blind hole 524.

In the present embodiment, the hole in the second clamping piece 52 is a blind hole 524, so that the annular protrusion 521 of the second clamping piece 52 is closed on the end surface facing the oil chamber 82, so as to reduce the gap between the two sides of the balance diaphragm 1, thereby reducing the leakage point and improving the sealing performance of the balance diaphragm 1.

The annular protrusion 521 is disposed on the second clamping piece 52 near the outer edge, and an annular groove 522 is disposed on the end surface of the second clamping piece 52 near the second central hole 523.

The annular groove 522 may be used to house a spring when the diaphragm assembly is installed in a pressure control valve.

The fixing bolt 53 includes a head portion 21 and a screw portion 22, and a second gasket is sleeved on the screw and is disposed between the screw portion 22 and the first clamping piece 51.

The fixing bolt 53 may have a structure similar to that of the diaphragm bolt 2, and is a half-thread bolt, a peripheral side wall surface of one end of the screw part 22 close to the screw head part 21 is smooth, and a peripheral side wall of the other end of the screw part 22 is provided with a thread. The second gasket can be similar to the first gasket in structure, and the inner ring is made of rubber and the outer ring is made of steel. This ensures the sealing property with the first pinching piece 51 and prevents oil or gas from flowing out through the gap between the bolt and the first fixing hole 511 and the gap between the diaphragm holder 5 and the elastic diaphragm 4.

Example 3

A pressure control valve comprises a diaphragm assembly, a shell 6, an end cover 61 and a piston 7, wherein the end cover 61 is arranged on the shell 6, the piston 7 is arranged in the shell 6, a threaded section 222 of a diaphragm bolt 2 is in threaded connection with a piston rod 71 of the piston 7, a space between a balance diaphragm 1 and the end cover 61 in the shell 6 is an air chamber 81, a space between the balance diaphragm 1 and the piston 7 in the shell 6 is an oil chamber 82, a piston rod 71 of the piston 7 is sleeved with a spring, one end of the spring abuts against the balance diaphragm 1, the other end of the spring abuts against the piston 7, and an oil pressure feedback pipe 83 is connected in the oil chamber 82.

One side of the piston 7 is an oil chamber 82, a space between the other side of the piston 7 and the shell 6 is an oil chamber, when the pressure control valve is opened, oil is conveyed through the oil chamber, and when the pressure control valve is closed, the piston 7 blocks a passage of the oil chamber to cut off the conveying of the oil. And a pressure control valve of the ground well joint is connected with the dead man and used for controlling the opening and closing of the ground well joint. The air chamber 81 is provided with an air port 84, the dead man is connected with the air chamber 81 through the air port 84, the dead man is started to inflate the air chamber 81 when the pressure control valve needs to be opened, the pressure in the air chamber 81 is increased, and therefore the spring is pushed to compress the piston 7 to move, oil conveying is achieved by communicating the oil chamber with an oil path for conveying oil, and meanwhile the oil chamber 82 is communicated with the oil path through an oil pressure feedback pipe 83. When the oil pressure in the oil passage increases, the sum of the oil pressure in the oil chamber 82 and the spring pressure is larger than the air pressure in the air chamber 81, so that the piston 7 is reset to block the oil chamber and the pressure control valve is closed, thereby achieving pressure control. After the oil transportation operation is normally completed, the dead man is closed, the pressure of the air chamber 81 is reduced, the spring pressure in the oil chamber 82 enables the piston 7 to automatically reset, and the pressure control valve is closed.

The piston rod 71 of the piston 7 is sleeved with two springs, the two springs include a first spring 91 and a second spring 92, the inner diameter of the second spring 92 is larger than the outer diameter of the first spring 91, and the second spring 92 is sleeved on the outer periphery of the first spring 91.

The first spring 91 may be disposed in the annular groove 522 in the second jaw 52. The annular groove 522 is provided on the inner circumference of the end surface of the second clip 52, and the annular protrusion 521 is provided on the outer circumference of the end surface of the second clip 52, so that the second spring 92 can be provided on the end surface of the second clip 52 between the annular groove 522 and the annular protrusion 521.

It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not limitations to the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. The utility model provides a diaphragm assembly, its characterized in that, is equipped with the confession including balanced diaphragm (1) and diaphragm bolt (2) at the center of balanced diaphragm (1) diaphragm bolt (2) male through-hole (11), diaphragm bolt (2) are including head (21) and pole portion (22), pole portion (22) are including being close to sealed section (221) of head (21) one end and screw thread section (222) that are located the other end, the periphery lateral wall surface of sealed section (221) is smooth, be equipped with the screw thread on the periphery lateral wall of screw thread section (222).

2. Diaphragm assembly according to claim 1, wherein the sealing section (221) is sleeved with a first gasket, the first gasket being provided between the stem (22) and the balancing diaphragm (1).

3. The diaphragm assembly of claim 2 wherein the first spacer includes an annular inner ring and an outer ring disposed on a peripheral sidewall of the inner ring, the inner ring is made of rubber, and the outer ring is made of corrosion-resistant steel.

4. A membrane assembly according to any one of claims 1 to 3, wherein the balancing membrane (1) comprises an annular elastic membrane (4) and a membrane clamp (5) arranged in the center of the elastic membrane (4) for clamping the elastic membrane (4), and the through hole (11) is located at the center of the membrane clamp (5).

5. The diaphragm assembly of claim 4, wherein the diaphragm clamp (5) comprises a first clamping piece (51) and a second clamping piece (52) which are stacked, the through hole (11) comprises a first center hole (512) located at the center of the first clamping piece (51) and a second center hole (523) located at the center of the second clamping piece (52), the elastic diaphragm (4) is clamped between the first clamping piece (51) and the second clamping piece (52), a plurality of first fixing holes (511) are formed in the first clamping piece (51) along the circumference, a plurality of second fixing holes (41) which are thick are formed in the elastic diaphragm (4) along the circumference, a plurality of screw holes are formed in the second clamping piece along the circumference, the first fixing holes (511), the second fixing holes (41) and the screw holes correspond to each other in position, and fixing bolts (53) are inserted into the first fixing holes (511), the second fixing holes (41) and the screw holes.

6. A diaphragm assembly according to claim 5, wherein an end surface of the second clamping piece (52) opposite to the other end of the first clamping piece (51) is provided with an annular protrusion (521), the screw hole is located at one end of the second clamping piece (52) close to the first clamping piece (51), the screw hole is located in the annular protrusion (521), and the screw hole is a blind hole (524).

7. A diaphragm assembly according to claim 6, wherein the annular projection (521) is provided on the second clamping lamella (52) near the outer edge, and an annular groove (522) is provided on the end surface of the second clamping lamella (52) near the second central hole (523).

8. Membrane assembly according to any one of the claims 5-7, wherein the fixing bolt (53) comprises a head (21) and a shank (22), on which a second gasket is sleeved, the second gasket being provided between the shank (22) and the first jaw (51).

9. A pressure control valve, comprising a diaphragm assembly according to any one of claims 1 to 8, a housing (6), an end cap (61) disposed on the housing (6), and a piston (7) disposed in the housing (6), wherein a threaded section (222) of the diaphragm bolt (2) is in threaded connection with a rod of the piston (7), a space between the balance diaphragm (1) and the end cap (61) in the housing (6) is an air chamber (81), a space between the balance diaphragm (1) and the piston (7) in the housing (6) is an oil chamber (82), a rod of the piston (7) is sleeved with a spring, one end of the spring abuts against the balance diaphragm (1), the other end of the spring abuts against the piston (7), and an oil pressure feedback pipe (83) is connected in the oil pressure feedback pipe (82).

10. The pressure control valve according to claim 9, wherein the piston (7) rod of the piston (7) is sleeved with two springs, the two springs comprise a first spring (91) and a second spring (92), the inner diameter of the second spring (92) is larger than the outer diameter of the first spring (91), and the second spring (92) is sleeved on the outer periphery of the first spring (91).