阅读说明：本技术 一种减压阀 (Pressure reducing valve ) 是由 龚斌辉 孙仁于 葛兵 严胜利 林张立 于 2019-12-06 设计创作，主要内容包括：本发明提供了一种减压阀,属于阀门技术领域。它解决了现有的减压阀稳压调节灵敏度不足等问题。本减压阀,包括阀体和阀芯,阀体与阀芯之间设置有稳压弹簧,阀体内设置有阀腔,阀腔内固定有阀座,阀座上设置有控流口,阀芯包括阀杆,阀杆上固定有与控流口对应设置的调压件,阀杆与阀体之间固定有小皮膜,阀腔中在阀座与小皮膜之间形成低压腔,阀腔中在阀座的另一侧形成高压腔,阀体上设置有与高压腔连通的进气口以及与低压腔连通的出气口,阀杆与阀体之间还固定有大皮膜,小皮膜位于大皮膜和调压件之间,阀腔中位于小皮膜与大皮膜之间形成调压腔,阀杆上设置有连通高压腔与调压腔的通气通道。本减压阀具有稳压调节时灵敏度高等优点。(The invention provides a pressure reducing valve, and belongs to the technical field of valves. It has solved the not enough scheduling problem of current relief pressure valve steady voltage regulation sensitivity. The pressure reducing valve comprises a valve body and a valve core, wherein a pressure stabilizing spring is arranged between the valve body and the valve core, a valve cavity is arranged in the valve body, a valve seat is fixed in the valve cavity, a flow control port is formed in the valve seat, the valve core comprises a valve rod, a pressure regulating piece which corresponds to the flow control port is fixed on the valve rod, a small membrane is fixed between the valve rod and the valve body, a low-pressure cavity is formed between the valve seat and the small membrane in the valve cavity, a high-pressure cavity is formed on the other side of the valve seat in the valve cavity, a gas inlet communicated with the high-pressure cavity and a gas outlet communicated with the low-pressure cavity are formed in the valve body, a large membrane is further fixed between the valve rod and the valve body, the small membrane is located between the large membrane and the pressure regulating piece, a pressure regulating. The pressure reducing valve has the advantages of high sensitivity and the like during pressure stabilizing adjustment.)

1. A pressure reducing valve comprises a valve body (1) and a valve core (3), wherein a pressure stabilizing spring (13) is arranged between the valve body (1) and the valve core (3), a valve cavity (1c) is arranged in the valve body (1), a valve seat (2) is fixed in the valve cavity (1c), a flow control port (2a) is arranged on the valve seat (2), the valve core (3) comprises a valve rod (4), a pressure regulating piece which corresponds to the flow control port (2a) is fixed on the valve rod (4), a small membrane (6) is fixed between the valve rod (4) and the valve body (1), a low-pressure cavity (1c1) is formed between the valve seat (2) and the small membrane (6) in the valve cavity (1c), a high-pressure cavity (1c2) is formed on the other side of the valve seat (2) in the valve cavity (1c), a gas inlet (1a1) communicated with a high-pressure cavity (1c2) and a gas outlet (35 2) communicated with a low-pressure cavity (1c1) are arranged on the valve body (1c, the high-pressure regulating valve is characterized in that a large membrane (7) is further fixed between the valve rod (4) and the valve body (1), the small membrane (6) is located between the large membrane (7) and a pressure regulating piece, a pressure regulating cavity (1c3) is formed between the small membrane (6) and the large membrane (7) in the valve cavity (1c), and a ventilation channel (5) for communicating the high-pressure cavity (1c2) with the pressure regulating cavity (1c3) is arranged on the valve rod (4).

2. The pressure reducing valve according to claim 1, wherein the valve rod (4) comprises a rod body (4a), a first sleeve (4c), a second sleeve (4d) and a pressure plate (4e) are sleeved and fixed on the rod body (4a), the small membrane (6) is sleeved on the rod body (4a), the inner edge of the small membrane (6) is fixed between the first sleeve (4c) and the second sleeve (4d), and the large membrane (7) is sleeved on the rod body (4a) and the inner edge of the large membrane (7) is fixed between the second sleeve (4d) and the pressure plate (4 e).

3. The pressure reducing valve according to claim 2, wherein the vent passage (5) comprises a first passage (5a) provided on the stem (4a), an annular gap I (5b) is arranged between the inner side surface of the sleeve I (4c) and the outer side surface of the rod body (4a), the first channel (5a) is communicated with the high-pressure cavity (1c2) and the first annular gap (5b), a second annular gap (5c) is arranged between the inner side surface of the inner edge of the small membrane (6) and the outer side surface of the rod body (4a), an annular gap III (5d) is arranged between the inner side surface of the sleeve II (4d) and the outer side surface of the rod body (4a), the first annular gap (5b), the second annular gap (5c) and the third annular gap (5d) are communicated in sequence, and a second channel (5e) for communicating the pressure regulating cavity (1c3) with the annular space III (5d) is arranged on the side wall of the second sleeve (4 d).

4. The pressure reducing valve according to claim 3, wherein a sealing ring (4h) is arranged between the inner side surface of the lower end of the first sleeve (4c) and the rod body (4a), the upper end surface of the first sleeve (4c) is provided with an annular convex ring (4c1), and the inner edge of the small membrane (6) is sleeved outside the convex ring (4c 1).

5. The pressure reducing valve according to any one of claims 2 to 4, wherein an annular positioning plate (8) made of plastic is arranged in the pressure regulating cavity (1c3), a positioning seat (1a3) corresponding to the positioning plate (8) is arranged on the inner wall of the valve body (1), the outer edge of the small membrane (6) is fixed between the positioning plate (8) and the positioning seat (1a3), an annular inner protrusion (8a) protruding upwards is arranged on the inner edge of the upper end surface of the positioning plate (8), and the axial projection of the pressure plate (4e) along the rod body (4a) and the axial projection of the inner protrusion (8a) along the rod body (4a) have overlapped parts.

6. The pressure reducing valve according to claim 5, wherein the upper end surface of the positioning plate (8) is provided with an outer protrusion (8b) protruding upwards at the outer edge, the outer protrusion (8b) is provided with a plurality of notches (8c), the notches (8c) are internally provided with fixing screws (9), the fixing screws (9) penetrate through the positioning plate (8) and are in threaded connection with the positioning seat (1a3), and the upper ends of the fixing screws (9) do not protrude out of the upper end surface of the outer protrusion (8 b).

7. The pressure reducing valve according to any one of claims 2 to 4, wherein an adjusting neck portion (1b1) is arranged at the upper end of the valve body (1), a mounting hole (1b2) communicated with the valve cavity (1c) is arranged on the upper end face of the adjusting neck portion (1b1), an adjusting cap (12) is connected to the mounting hole (1b2) in an internal thread mode, the pressure stabilizing spring (13) is connected between the adjusting cap (12) and the pressure plate (4e), and a baffle plate (14) abuts between the adjusting cap (12) and the pressure stabilizing spring (13).

8. The pressure reducing valve according to claim 7, wherein the adjusting cap (12) has a convex conical body (12a) at the center of the lower surface, a first through hole (12b) is formed in the conical body (12a), a recessed portion (14a) is formed in the baffle plate (14) opposite to the conical body (12a), the conical body (12a) is located in the recessed portion (14a), and a second through hole (14b) is formed in the recessed portion (14 a).

9. The pressure-reducing valve according to any one of claims 1 to 4, characterized in that the pressure regulator comprises a sealing gasket (4b), the sealing gasket (4b) being located in the high-pressure chamber (1c2), the sealing gasket (4b) being capable of bearing against the valve seat (2) and forming a seal.

Technical Field

The invention belongs to the technical field of valves and relates to a pressure reducing valve.

Background

The valve is used for controlling the medium in the pipeline and is a mechanical product with a movable mechanism. The valve can be divided into gate valve, stop valve, throttle valve, ball valve, butterfly valve, plug valve, check valve, safety valve and pressure reducing valve, the pressure reducing valve is a valve which reduces the medium pressure by the throttling of the opening and closing piece (valve clack) and automatically keeps the pressure in a certain range by the direct action of the valve differential pressure.

The chinese patent literature discloses a pressure reducing valve, the application number: CN 00219260.8; the notice number is: CN2416309Y ], comprising a base, an upper cover and a pressure adjusting mechanism, wherein, one end of the base is provided with an air inlet, the other end is provided with an air outlet, the middle part of the base is provided with a partition wall which blocks the air inlet and the air outlet and divides the inner cavity of the base into a high pressure cavity and a low pressure cavity, the partition wall is provided with an adjusting hole, the adjusting hole is provided with a pressure adjusting mechanism composed of a pressure adjusting bolt, a sealing ring, a clamping piece, a involucra, a spring spacing piece, a spring and a pressure adjusting bolt, the mechanism is positioned between the partition wall of the base and the upper cover connected with the upper opening of the base, and the upper cover.

When the air inlet pressure value changes, namely the pressure value of the high-pressure cavity changes, the pressure value of the low-pressure cavity changes, the leather membrane positioned at the low-pressure cavity can feel the change to generate convex or concave deformation, so that the positions of the clamping piece and the pressure regulating bolt are driven to rise or fall, and finally the through-flow gap between the pressure regulating bolt and the sealing ring is changed, so that the throttling effect of fluid flowing through the gap, namely the magnitude of fluid pressure loss, is changed, the pressure value of the low-pressure cavity, namely the pressure value of the air outlet is kept in a certain numerical value range, and the pressure reducing valve achieves the pressure stabilizing effect. However, the air pressure directly sensed by the diaphragm is the air pressure in the low-pressure cavity, but the diaphragm cannot directly sense the air pressure in the high-pressure cavity, and the response to the change of the air pressure value in the high-pressure cavity is slow, so that the sensitivity of pressure stabilizing adjustment of the conventional pressure reducing valve is insufficient.

Disclosure of Invention

The invention aims to provide a pressure reducing valve aiming at the problems in the prior art, and solves the technical problem that the stability and regulation sensitivity of the conventional pressure reducing valve is insufficient.

The purpose of the invention can be realized by the following technical scheme:

a pressure reducing valve comprises a valve body and a valve core, a pressure stabilizing spring is arranged between the valve body and the valve core, a valve cavity is arranged in the valve body, a valve seat is fixed in the valve cavity, a flow control opening is arranged on the valve seat, the valve core comprises a valve rod, a pressure regulating piece which is arranged corresponding to the flow control port is fixed on the valve rod, a small membrane is fixed between the valve rod and the valve body, a low-pressure cavity is formed between the valve seat and the small membrane in the valve cavity, a high-pressure cavity is formed on the other side of the valve seat in the valve cavity, the valve body is provided with an air inlet communicated with the high pressure cavity and an air outlet communicated with the low pressure cavity, it is characterized in that a large leather diaphragm is fixed between the valve rod and the valve body, the small leather diaphragm is positioned between the large leather diaphragm and the pressure regulating piece, a pressure regulating cavity is formed between the small membrane and the large membrane in the valve cavity, and a ventilation channel for communicating the high-pressure cavity with the pressure regulating cavity is arranged on the valve rod.

When the pressure reducing valve is installed, the valve rod is in a vertical state, and the large membrane is located at the upper end of the valve rod. When the gas valve is used, gas enters the high-pressure cavity from the gas inlet, then enters the low-pressure cavity through the flow control port of the valve seat, and then flows out from the gas outlet. The high-pressure cavity is communicated with the pressure regulating cavity through a ventilation channel on the valve rod, and the air pressure in the high-pressure cavity is the same as that of the pressure regulating cavity. After the pressure reducing valve is ventilated, the valve core is under the action of the air pressure of the pressure regulating cavity on the large membrane, the action of the air pressure of the low pressure cavity on the small membrane and the action of the spring on the valve core, and the actions act on the valve core together to balance the stress of the valve core, so that the valve core is kept stable. When the air pressure of the high-pressure cavity rises or falls, the air pressure of the pressure regulating cavity rises or falls synchronously, so that the large leather diaphragm drives the valve rod to move upwards or downwards, meanwhile, the air pressure of the low-pressure cavity also rises or falls, so that the small leather diaphragm also drives the valve rod to move upwards or downwards, under the combined action of the large leather diaphragm and the small leather diaphragm, the relative position of the pressure regulating part and the flow control port can be changed immediately, namely, a pressure reducing gap between the pressure regulating part and the valve seat is changed, so that the air pressure of the low-pressure cavity is reduced or increased immediately, the air pressure of the air outlet is kept in a certain air pressure range, and the pressure stabilizing effect is achieved. The structure of the pressure reducing valve enables the small leather diaphragm to feel the pressure change of the high pressure cavity through the pressure change of the low pressure cavity, and meanwhile, the large leather diaphragm can also directly feel the pressure change of the high pressure cavity, under the combined action of the large leather diaphragm and the small leather diaphragm, the valve rod can respond faster when the pressure of the high pressure cavity changes, and therefore the sensitivity of the pressure reducing valve during pressure stabilizing adjustment is improved.

In the pressure reducing valve, the valve rod comprises a rod body, a first sleeve, a second sleeve and a pressure plate are sleeved and fixed on the rod body, the small leather film is sleeved on the rod body, the inner edge of the small leather film is fixed between the first sleeve and the second sleeve, and the large leather film is sleeved on the rod body, and the inner edge of the large leather film is fixed between the second sleeve and the pressure plate.

The large leather diaphragm and the small leather diaphragm are fixed on the valve rod through the first sleeve, the second sleeve and the pressing plate, the fixing is stable, meanwhile, the large leather diaphragm and the small leather diaphragm are separated through the second sleeve, the large leather diaphragm and the small leather diaphragm are prevented from being in contact or colliding, the large leather diaphragm and the small leather diaphragm are stable in use, and the sensitivity of the pressure reducing valve during pressure stabilizing adjustment is improved.

In the pressure reducing valve, the ventilation channel comprises a first channel arranged on the rod body, a first annular gap is formed between the inner side surface of the first sleeve and the outer side surface of the rod body, the first channel is communicated with the high-pressure cavity and the first annular gap, a second annular gap is formed between the inner side surface of the inner edge of the small leather film and the outer side surface of the rod body, a third annular gap is formed between the inner side surface of the second sleeve and the outer side surface of the rod body, the first annular gap, the second annular gap and the third annular gap are sequentially communicated, and a second channel communicated with the pressure regulating cavity and the third annular gap is arranged on the side wall of the second sleeve.

Through setting up passageway one, annular gap two, annular gap three and passageway two, make high-pressure chamber and pressure regulating chamber intercommunication, make big involucra can carry out quick response to the change of high-pressure chamber atmospheric pressure, be favorable to improving the sensitivity when relief pressure valve steady voltage is adjusted.

In the pressure reducing valve, a sealing ring is arranged between the inner side surface of the lower end of the first sleeve and the rod body, an annular convex ring is arranged on the upper end surface of the first sleeve, and the inner edge of the small involucra is sleeved outside the convex ring.

On the one hand, the sealing ring plays a role in sealing, the situation that the pressure reducing valve fails due to the fact that the low-pressure cavity is communicated with the annular gap is avoided, on the other hand, the sealing ring also has a limiting effect, the existence of the annular gap I is guaranteed, the communication between the high-pressure cavity and the pressure regulating cavity is guaranteed, accordingly, the large leather membrane responds to the change of the air pressure of the high-pressure cavity, and the sensitivity of the pressure reducing valve during pressure stabilizing and regulating is improved. The convex ring has a limiting function, the existence of a third annular gap is ensured, the communication between the high-pressure cavity and the pressure regulating cavity is favorably ensured, and the sensitivity of the pressure reducing valve during pressure stabilizing regulation is favorably improved.

In the pressure reducing valve, an annular positioning plate made of plastic is arranged in the pressure regulating cavity, a positioning seat corresponding to the positioning plate is arranged on the inner wall of the valve body, the outer edge of the small membrane is fixed between the positioning plate and the positioning seat, an annular inward protrusion protruding upwards is arranged at the inner edge of the upper end surface of the positioning plate, and the projection of the pressure plate along the axial direction of the rod body and the projection of the inward protrusion along the axial direction of the rod body are overlapped.

The small leather film is fixed on the valve body through the positioning plate and the positioning seat. Interior arch has the effect that increases locating plate structural strength on the one hand, guarantee the fixed action of locating plate to little involucra, on the other hand has limiting displacement, when the relief pressure valve is not ventilated, under the effect of valve rod gravity and spring elasticity, the valve rod is located the extreme low, big involucra and little involucra downwardly stretching, at this moment, interior arch carries on spacingly to the clamp plate, prevent that the valve rod from excessively moving down, thereby can prevent the excessive stretching of big involucra and little involucra, guarantee the stability that little involucra and big involucra used, be favorable to improving the sensitivity when relief pressure valve steady voltage is.

In the pressure reducing valve, the outer edge of the upper end surface of the positioning plate is provided with an outward bulge protruding upwards, the outward bulge is provided with a plurality of notches, the notches are internally provided with fixing screws, the fixing screws penetrate through the positioning plate and then are in threaded connection with the positioning seat, and the upper end of each fixing screw does not protrude out of the upper end surface of the outward bulge.

The positioning plate is fixed on the fixing seat through the fixing screw, and the positioning plate is provided with the outer bulge, so that the effect of increasing the structural strength of the positioning plate is achieved, and the fixing effect of the positioning plate on the small leather film is ensured; the fixing screw does not protrude out of the outer protrusion, so that the large leather membrane is prevented from being damaged due to the fact that the large leather membrane is in contact with the fixing screw when the pressure reducing valve is not used, the large leather membrane is stable to use, and the sensitivity and the use safety of the pressure reducing valve during pressure stabilizing adjustment are guaranteed.

In the pressure reducing valve, the upper end of the valve body is provided with the adjusting neck, the upper end face of the adjusting neck is provided with the mounting hole communicated with the valve cavity, the mounting hole is internally and threadedly connected with the adjusting cap, the pressure stabilizing spring is connected between the adjusting cap and the pressure plate, and the adjusting cap and the pressure stabilizing spring are abutted against the baffle plate.

The compression amount of the pressure stabilizing spring is changed by rotating the adjusting cap, the acting force of the pressure stabilizing spring on the valve core is adjusted, so that the air pressure value at the air outlet is adjusted, namely, the air outlet pressure of the pressure reducing valve is adjusted by rotating the pressure adjusting cap, and the pressure adjusting test can be generally carried out before the pressure reducing valve leaves a factory for adjustment. Set up the baffle between steady voltage spring and the regulation cap, can avoid steady voltage spring and regulation cap contact for the rotation of adjusting the cap can not drive steady voltage spring and rotate, thereby makes the pressure regulating process accurately go on.

In the pressure reducing valve, the center of the lower surface of the adjusting cap is provided with a convex conical body, a first through hole is formed in the conical body, a concave part is formed in the baffle plate relative to the conical body, the conical body is located in the concave part, and a second through hole is formed in the concave part.

Through conical body and depressed part to the baffle with adjust between the cap fix a position, reduce and adjust the cap and rotate the possibility that makes the baffle take place the skew, make steady voltage spring position accurate to make the pressure regulating process go on accurately. The installation hole is communicated with the outside through the first through hole and the second through hole, so that the cavity above the large leather diaphragm is communicated with the outside, the cavity above the large leather diaphragm is prevented from forming a sealing state to influence the large leather diaphragm to drive the valve rod to move, the large leather diaphragm can quickly respond when the air pressure of the high-pressure cavity changes, and the sensitivity of the pressure reducing valve during pressure stabilizing adjustment is improved.

In foretell relief pressure valve, the pressure regulating part is including sealed the pad, sealed the pad is located the high pressure chamber, sealed pad can support and lean on the disk seat and form sealedly.

When the pipeline that the gas outlet is connected takes place to leak gas, the well atmospheric pressure in gas outlet and low pressure chamber is the low pressure state, and at this moment, under the effect of atmospheric pressure and high pressure chamber atmospheric pressure in the pressure regulating chamber, the valve rod upwards moves immediately makes sealed pad support and lean on the disk seat and form sealedly, and relief pressure valve self-closing prevents that the gas from taking place a large amount of leakages, guarantees the security that the relief pressure valve used.

Compared with the prior art, the invention has the following advantages:

a large leather diaphragm is fixed between the valve rod and the valve body, a pressure regulating cavity is formed between the large leather diaphragm and the small leather diaphragm, and a ventilation channel for communicating the pressure regulating cavity with the high pressure cavity is arranged on the valve rod, so that the response of the valve core to the pressure change of the high pressure cavity is accelerated, and the sensitivity of the pressure reducing valve during pressure stabilizing regulation is improved. The second sleeve is arranged between the large leather membrane and the small leather membrane, the small leather membrane is fixed by the fixing plate made of plastic, the inner protrusion and the outer protrusion are arranged on the fixing plate, the use stability of the large leather membrane and the small leather membrane is guaranteed, and the improvement of the sensitivity of the pressure-stabilizing adjustment valve is facilitated. Support between steady voltage spring and the regulation cap and lean on there being the baffle, guarantee the stability of steady voltage spring position, make the pressure regulating process accurately go on.

Drawings

FIG. 1 is a perspective view of the present pressure relief valve;

FIG. 2 is a cross-sectional view of the present pressure relief valve;

FIG. 3 is a cross-sectional view of the valve cartridge of the present pressure reducing valve;

FIG. 4 is a top view of the present pressure relief valve;

fig. 5 is an exploded view of the present pressure reducing valve.

In the figure, 1, a valve body; 1a, a lower seat body; 1a1, air inlet; 1a2, air outlet; 1a3, positioning seat; 1b, an upper cover body; 1b1, adjusting neck; 1b2, mounting holes; 1b3, air vent; 1c, a valve cavity; 1c1, low pressure chamber; 1c2, high pressure chamber; 1c3, pressure regulating cavity; 1c4, atmospheric chamber; 2. a valve seat; 2a, a flow control port; 3. a valve core; 4. a valve stem; 4a, a rod body; 4a1, stop ring; 4b, a sealing gasket; 4c, a sleeve I; 4c1, convex ring; 4d, a second sleeve; 4e, pressing a plate; 4e1, lower limit ring; 4f, fixing a nut; 4g, locking a nut; 4h, sealing rings; 5. a vent passage; 5a, a first channel; 5b, a first annular gap; 5c, a second annular gap; 5d, annular space III; 5e, a second channel; 6. a small skin; 7. large skin membranes; 8. positioning a plate; 8a, an inner bulge; 8b, an outer bulge; 8c, a gap; 9. a set screw; 10. fastening screws; 11. riveting; 12. an adjusting cap; 12a, a conical body; 12b, a first through hole; 13. a pressure stabilizing spring; 14. a baffle plate; 14a, a recess; 14b, a second through hole; 14c, an upper limiting ring; 15. and (7) capping.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.