CN211924965U

CN211924965U - High-precision back pressure valve

Info

Publication number: CN211924965U
Application number: CN201922034857.6U
Authority: CN
Inventors: 姚小弟; 徐伟杰
Original assignee: PINGHU RUIYANG PRECISION MACHINERY CO Ltd
Current assignee: PINGHU RUIYANG PRECISION MACHINERY CO Ltd
Priority date: 2019-11-22
Filing date: 2019-11-22
Publication date: 2020-11-13
Anticipated expiration: 2029-11-22

Abstract

The utility model relates to a back pressure valve technical field, in particular to a high-precision back pressure valve, which comprises a knob, the inner wall of the knob is welded and fixed with a lock nut, the axle center of the lock nut is connected with an adjusting screw rod by screw thread, the inner wall of the bottom of the knob is connected with an upper cover by rotation, the low end of the upper cover is fixedly provided with a parent body, the inner wall of the upper cover is fixedly connected with a diaphragm, the top of the diaphragm is fixedly provided with a diaphragm flat plate, the top of the diaphragm flat plate is sleeved with a main spring, the high-precision back pressure valve is characterized in that the valve block does not receive the acting force of the main spring but only receives the acting force of a sealing spring in the whole working process, the valve block is stressed little, the product is not plastically deformed, the pressure relief progress is high, the service life is long, the valve block does not receive the acting force of, the back pressure valve has high pressure setting precision and long service life.

Description

High-precision back pressure valve

Technical Field

The utility model relates to a back pressure valve technical field specifically is a high accuracy back pressure valve.

Background

In precision equipment gas supply system, strict to gas supply pressure and cleanliness factor requirement because of equipment, the gas supply pressure scope is very narrow, the unable normal operating of equipment is crossed to the low pressure, the pressure is too high then leads to equipment failure, will guarantee that equipment can not cause the damage because of system pressure is too high, need install the relief valve at equipment inlet end and prevent that gas supply pressure is too high, but the too high situation of pressure appears in general unable guarantee gas supply system of unable enough assurance relief valve precision, back pressure valve on the existing market belongs to when the spring directly carries, the disk seat is out of shape great behind the effort of main spring, lead to the pressure release precision not high, or need enlarge the diaphragm area in order to provide the precision, the valve is bulky, and is high in cost.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a high accuracy back pressure valve to solve the problem that proposes among the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme:

the utility model provides a high accuracy back pressure valve, includes the knob, the inner wall welded fastening of knob has lock nut, lock nut's axle center department threaded connection has accommodate the lead screw, the inner wall of knob bottom rotates and is connected with the upper cover, the low side fixed mounting of upper cover has the parent.

Preferably, the inner wall of the upper cover is fixedly connected with a diaphragm, a diaphragm flat plate is fixedly mounted at the top of the diaphragm, a main spring is sleeved at the top of the diaphragm flat plate, and a spring button is fixedly mounted at the top of the main spring.

Preferably, the inner wall of the parent body is fixedly provided with a return spring, the top of the return spring is fixedly provided with a seat body, and the top of the seat body is fixedly provided with a valve rod.

Preferably, a valve rod cap is fixedly mounted at the top of the valve rod, and a sealing spring is sleeved between the valve rod and the valve rod cap.

Preferably, a nozzle is adjusted on the surface of the valve rod cap, a valve plate is fixedly installed at the bottom of the nozzle, the bottom of the valve plate is movably connected inside the matrix, and the top of the valve rod cap is in contact with the bottom of the diaphragm.

Preferably, the lower end of the adjusting screw rod passes through the upper cover and contacts with the top of the spring button.

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

1. this high accuracy back pressure valve, because back pressure valve is in whole course of the work, the valve block does not receive main spring's effort, and only receives sealing spring's effort, and the valve block atress is little, can not product plastic deformation, so the pressure release progress is high, long service life, and the valve block does not receive main spring's effort, only sealing spring's sealing force, and the valve block atress is little, is difficult for producing plastic deformation, and back pressure valve settlement pressure precision is high, long service life.

2. According to the high-precision back pressure valve, the valve core of the back pressure valve is made of polychlorotrifluoroethylene with high hardness, the valve core is only acted by an auxiliary spring force and is not directly acted by a main spring, and the pressure relief pressure precision is high under the sealing deformation of the valve core.

3. According to the high-precision back pressure valve, the back pressure valve is small in size, a valve seat of the back pressure valve is made of polytrifluoroethylene, the material is hard, and a valve core is only acted by a sealing spring force and is not directly acted by a main spring, so that the pressure relief pressure precision is high.

Drawings

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

fig. 2 is the schematic view of the structure of the middle valve rod of the present invention.

In the figure: 1. a knob; 2. locking the nut; 3. a spring button; 4. a main spring; 5. a diaphragm plate; 6. a membrane; 7. a valve stem cap; 8. a seal spring; 9. a valve stem; 10. a nozzle; 11. a valve plate; 12. a base body; 13. A return spring; 14. a parent body; 15. an upper cover; 16. and adjusting the screw rod.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

Referring to fig. 1-2, the present invention provides a technical solution:

the utility model provides a high accuracy back pressure valve, including knob 1, the inner wall welded fastening of knob 1 has lock nut 2, the axle center department threaded connection of lock nut 2 has accommodate the lead screw 16, the inner wall of knob 1 bottom is rotated and is connected with upper cover 15, the low side fixed mounting of upper cover 15 has parent 14, the back pressure valve is the less high accuracy back pressure valve of a volume, back pressure valve disk seat adopts polytrifluoroethylene, the material is harder, the case only receives 8 power of sealing spring and does not receive main spring 4's direct effort, so the pressure release pressure precision is high.

In this embodiment, the inner wall of the upper cover 15 is fixedly connected with a diaphragm 6, the top of the diaphragm 6 is fixedly provided with a diaphragm flat plate 5, the top of the diaphragm flat plate 5 is sleeved with a main spring 4, and the top of the main spring 4 is fixedly provided with a spring button 3.

Further, the inner wall fixed mounting of parent 14 has reset spring 13, and reset spring 13's top fixed mounting has pedestal 12, and the top fixed mounting of pedestal 12 has valve rod 9, reaches better slow pressure effect.

Furthermore, a valve rod cap 7 is fixedly installed at the top of the valve rod 9, a sealing spring 8 is sleeved between the valve rod 9 and the valve rod cap 7, a valve core of the back pressure valve is made of polychlorotrifluoroethylene with high hardness, the valve core is only acted by an auxiliary spring force and is not directly acted by a main spring 4, and the pressure relief pressure precision is high under the sealing deformation of the valve core.

It is worth to be noted that, by rotating the knob 1 clockwise, the knob 1 drives the adjusting screw rod 16 to rotate clockwise, the adjusting screw rod 16 moves downwards to compress the main spring 4 through the spring button 3, the main spring 4 pushes the diaphragm 6 to move downwards through the diaphragm flat plate 5, the diaphragm 6 does not move downwards after moving downwards and contacting the nozzle 8, the diaphragm 6 pushes the valve rod cap 7 when moving downwards, the valve rod cap 7 pushes the sealing spring 8, the sealing spring 8 pushes a downward pushing force f1 to the valve rod 9 after being pressed, the lower part of the valve rod 9 is pushed by an upward pushing force f2 of the return spring 13, at the moment, f1 is greater than f2, and the valve rod 9 moves downwards to generate sealing with the valve plate 11.

Besides, a nozzle 10 is adjusted on the surface of the valve rod cap 7, a valve plate 11 is fixedly installed at the bottom of the nozzle 10, the bottom of the valve plate 11 is movably connected inside a parent body 14, gas enters a back pressure valve cavity from an air inlet of the parent body 14, when the gas pressure is lower than a set value, the valve rod 9 and the valve plate 11 are in a sealing state, when the gas pressure is higher than the set value, the diaphragm 6 is upwards displaced by the gas pressure, downward acting force f1 of the valve rod 9 is reduced by the sealing spring 8, when f1< f2, the valve rod 9 is upwards displaced under the acting force of the return spring 13, the valve rod 9 and the valve plate 11 are opened, and the gas is discharged from an air outlet. When the pressure drops below the set pressure, the diaphragm 6 is displaced downwards and the valve rod 9 and the valve plate 11 are sealed again.

It is worth to be noted that, in the whole working process of the back pressure valve, the valve block 11 is not subjected to the acting force of the main spring 4 but only subjected to the acting force of the sealing spring 8, the valve block 11 is small in stress and cannot be plastically deformed, so that the pressure relief progress is high, the service life is long, the valve block 11 is not subjected to the acting force of the main spring 4 but only sealed by the sealing force of the sealing spring 8, the valve block 11 is small in stress and is not easy to generate plastic deformation, the set pressure precision of the back pressure valve is high, and the service life is long.

In addition, the lower end of the adjusting screw 16 passes through the upper cover 15 and contacts the top of the spring knob 3, and the top of the valve stem cap 7 and the bottom of the diaphragm 6 contact each other, so that pressure can be better transmitted.

The utility model discloses a high accuracy back pressure valve is when using, clockwise rotation back pressure valve knob 1, knob 1 drives accommodate the lead screw 16 and rotates downwards, through accommodate the lead screw 16 pressure spring button 3, spring button 3 compresses main spring 4, on main spring 4 transmits the effort to diaphragm 6 by diaphragm flat plate 5, downstream behind the 6 atress of diaphragm, promotes valve rod 9 after diaphragm 6 downstream, valve rod 9 produces sealedly with valve block 11 under seal spring 8's spring force effect.

When the pressure at the inlet end rises, the upward thrust of the gas pressure at the inlet end on the diaphragm 6 is greater than the downward thrust of the main spring 4 on the diaphragm 6, the diaphragm 6 moves upwards, the valve rod 9 moves upwards under the action of the return spring 13, the valve rod 9 and the valve plate 11 are sealed and opened, the gas is discharged, and the pressure at the inlet end drops along with the gas pressure. The diaphragm 6 moves downwards to push the valve rod cap 7, the valve rod cap 7 compresses the sealing spring 8, the sealing spring 8 pushes the valve rod 9 downwards, and the valve rod 9 and the valve plate 11 generate sealing under the action force of the sealing spring 8.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It should be understood by those skilled in the art that the present invention is not limited by the above embodiments, and the description in the above embodiments and the description is only preferred examples of the present invention, and is not intended to limit the present invention, and that the present invention can have various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications all fall into the scope of the claimed invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A high accuracy back pressure valve, includes knob (1), its characterized in that: the inner wall welded fastening of knob (1) has lock nut (2), the axle center department threaded connection of lock nut (2) has adjusting screw (16), the inner wall of knob (1) bottom rotates and is connected with upper cover (15), the low side fixed mounting of upper cover (15) has parent (14).

2. The high precision back pressure valve according to claim 1, wherein: the inner wall fixedly connected with diaphragm (6) of upper cover (15), the top fixed mounting of diaphragm (6) has diaphragm flat board (5), mainspring (4) have been cup jointed at the top of diaphragm flat board (5), the top fixed mounting of mainspring (4) has spring button (3).

3. The high precision back pressure valve according to claim 1, wherein: the inner wall fixed mounting of parent (14) has reset spring (13), the top fixed mounting of reset spring (13) has pedestal (12), the top fixed mounting of pedestal (12) has valve rod (9).

4. The high precision back pressure valve according to claim 3, wherein: the top of valve rod (9) is fixed with valve rod cap (7), cup jointed sealing spring (8) between valve rod (9) and valve rod cap (7).

5. The high precision back pressure valve according to claim 4, wherein: the surface adjustment of valve stem cap (7) has nozzle (10), the bottom fixed mounting of nozzle (10) has valve block (11), the bottom swing joint of valve block (11) is in the inside of parent (14), the top of valve stem cap (7) and the bottom of diaphragm (6) contact each other.

6. The high precision back pressure valve according to claim 1, wherein: the lower end of the adjusting screw rod (16) penetrates through the upper cover (15) and is in contact with the top of the spring button (3).