High-pressure regulating valve

Abstract

The utility model discloses a high pressure regulating valve which comprises a valve body and a pressure regulating mechanism, a protective cover and a limiting cavity are arranged at a center hole between the valve body and a valve cover, the center hole is surrounded by the protective cover to form the limiting cavity, and the pressure regulating mechanism comprises an upper diaphragm arranged in a pressure regulating cavity of the valve cover and a lower diaphragm arranged in the limiting cavity. The pressure regulating rod movably penetrates through the protective cover to connect the upper diaphragm and the lower diaphragm, the protective cover is provided with a guide hole communicated with the limiting cavity and the medium channel, so that high-pressure gas enters the limiting cavity through the guide hole to extrude the lower diaphragm, and by adopting the technical scheme, the lower diaphragm can be prevented from being excessively expanded or stretched under high pressure through physical constraint of the protective cover and the limiting cavity; abnormal vibration of the diaphragm under high-frequency pressure fluctuation can be reduced through the limiting cavity, it is ensured that the deformation quantity of the lower diaphragm is controlled within a reasonable range, it is ensured that linkage response of the lower diaphragm and an adjusting mechanism is more linear, and sensitivity and reliability of pressure adjustment are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to valve control technical field, concretely relates to a high pressure pressure regulating valve. BACKGROUND

[0002] The pressure regulating valve is the equipment that keeps the outlet gas to be the equipment that keeps the outlet gas to be regulated through the automatic change of the gas flow of the regulating valve. Such as Chinese patent document CN216447495U discloses a kind of gas pressure regulating valve, including the air vent valve port being arranged in valve body and the valve disc structure for opening and closing air vent valve port, and pressure regulating structure for adjusting the pressure of valve disc structure being arranged in valve body, valve disc structure includes the first sealing valve disc being arranged between buffer cavity and the pulse cavity, and the second sealing valve disc being arranged between pulse cavity and gas passage, and the third sealing valve disc being movably arranged in gas passage and opening and closing the air vent valve port, first sealing valve disc and second sealing valve disc are respectively provided with the elastic diaphragm being embedded and fixed in valve body, elastic diaphragm is divided into the upper diaphragm cooperating with first valve disc and the lower diaphragm cooperating with second sealing valve disc, the volume of this lower diaphragm is obviously made smaller compared to upper diaphragm, it is easy to cause excessive expansion to pulse cavity side when being subjected to greater pressure and cause diaphragm fatigue and permanent damage, seriously leading to dynamic balance destruction and pressure out of control. SUMMARY

[0003] Therefore, the technical problem to be solved by the utility model lies in overcoming the problem that lower diaphragm of pressure regulating valve in prior art is easy to cause excessive expansion when being subjected to greater pressure and cause diaphragm fatigue and permanent damage, seriously leading to dynamic balance destruction and pressure out of control.

[0004] To solve the above technical problems, the utility model provides a kind of high pressure pressure regulating valve, including valve body, pressure regulating mechanism, the valve body includes medium passage and the valve port being arranged in medium passage, the valve cover includes the pressure regulating chamber being communicated with medium passage, the center hole between the valve body and valve cover is provided with protective cover and the limiting cavity being formed by protective cover around center hole, the pressure regulating mechanism includes the upper diaphragm being arranged in the pressure regulating chamber and the lower diaphragm being arranged in the limiting cavity, and the pressure regulating rod being moved and passing through protective cover and connecting the upper diaphragm and lower diaphragm, the protective cover is surrounded by the lower diaphragm setting, the protective cover is equipped with the guide hole being communicated with the limiting cavity and the medium passage, the pressure regulating rod passes through guide hole and is equipped with the valve disc being matched with valve port.

[0005] As a preferred scheme, the protective cover includes upper protective cover and lower protective cover being oppositely arranged at both ends of center hole, and limiting cavity is formed between upper protective cover and lower protective cover.

[0006] As a preferred scheme, the lower protective cover is provided with a guide rod extending to the valve port along the moving direction of the pressure regulating rod, a guide hole extending in the same direction as the guide rod is arranged in the guide rod, the pressure regulating rod moves through the guide rod, and an air gap is formed between the guide rod and the pressure regulating rod.

[0007] As a preferred scheme, the upper diaphragm separates the pressure regulating cavity into an upper pressure cavity and a lower pressure cavity, the pressure regulating mechanism comprises a pressure regulating spring arranged in the upper pressure cavity and abutting against one side of the upper diaphragm, the pressure regulating rod is arranged on the other side of the lower diaphragm through a connecting structure, and a pressure guide pipe is arranged in communication between the lower pressure cavity and the medium channel.

[0008] As a preferred scheme, the connecting structure comprises a sealing connecting piece fixedly arranged at the center of the upper diaphragm and a diaphragm seat arranged in linkage with the pressure regulating rod, and the diaphragm seat is threadedly fixedly connected with the sealing connecting piece.

[0009] As a preferred scheme, the lower diaphragm is connected with the pressure regulating rod through the diaphragm seat, the limiting cavity is separated by the lower diaphragm to form two sealed cavities, the medium channel comprises an air inlet channel and an air outlet channel arranged on the two sides of the valve port, the cavity on the lower side of the lower diaphragm is communicated with the air inlet channel through a guide pipe, and the pressure guide pipe communicates with the air outlet channel.

[0010] As a preferred scheme, the outer side of the lower diaphragm is fixed between the protective cover and the upper cover, the inner side of the lower diaphragm is fixed on the diaphragm seat, and an annular connecting groove in fitting with the lower diaphragm is arranged on the side wall of the diaphragm seat.

[0011] As a preferred scheme, the sealing connecting piece is fastened to the upper diaphragm through a fixing nut, a first sealing ring is arranged between the diaphragm seat and the sealing connecting piece, and a second sealing ring is arranged between the sealing connecting piece and the lower diaphragm.

[0012] As a preferred scheme, the diaphragm seat is movably arranged in the limiting cavity, and the upper protective cover is provided with an opening through which the diaphragm seat passes.

[0013] As a preferred scheme, the valve cover comprises a cylindrical cavity connected with the upper pressure cavity and an adjusting screw threadedly connected in the cylindrical cavity, one end of the pressure regulating spring abuts against the adjusting screw, and the other end of the pressure regulating spring abuts against the upper diaphragm.

[0014] Compared with the prior art, the technical scheme of the utility model has the following advantages:

[0015] 1. In the high-pressure regulating valve provided by this utility model, a protective cover is set at the central hole between the valve body and the valve cover, forming a limiting cavity surrounding the lower diaphragm. The protective cover has a guide hole connecting the limiting cavity and the medium channel, allowing gas from the medium channel to enter the limiting cavity through the guide hole and compress the lower diaphragm to undergo elastic deformation. The advantages of this structural design are: firstly, the physical constraint of the protective cover and the limiting cavity can prevent the lower diaphragm from over-expanding or stretching under high pressure, thereby avoiding material fatigue or permanent deformation caused by excessive deformation and extending its service life; secondly, the limiting cavity can reduce abnormal vibration of the diaphragm under high-frequency pressure fluctuations, avoiding outlet pressure fluctuations caused by diaphragm vibration, ensuring that the deformation of the lower diaphragm is controlled within a reasonable range, making its linkage response with the regulating mechanism more linear, and improving the sensitivity and reliability of pressure regulation.

[0016] 2. In the high-pressure regulating valve provided by this utility model, the protective cover is composed of an upper cover and a lower cover, thereby forming a physical barrier that surrounds the lower diaphragm. This not only provides limiting protection for the lower diaphragm, but also prevents external impurities (such as dust, oil, and particulate matter) from directly contacting the diaphragm surface. This structural design, through physical limiting and protection mechanisms, significantly improves the reliability, environmental adaptability, and long-term stability of the diaphragm while ensuring the core function of the regulating valve (pressure stability control), extending its service life, and reducing maintenance frequency and spare parts costs.

[0017] 3. In the high-pressure regulating valve provided by this utility model, the lower cover is provided with a guide rod extending along the moving direction of the regulating rod. A guide hole is provided through the guide rod for the regulating rod to pass through. This structure provides precise axial movement guidance for the regulating rod on the guide rod, limiting the radial offset or swing of the regulating rod and ensuring that the valve disc and valve port are always aligned. On the other hand, the guide hole of the guide rod connects to the medium channel, and the pressure at the inlet end of the medium channel is quickly transmitted to the intermediate diaphragm through the guide hole, ensuring that the diaphragm is more sensitive to pressure changes. Thus, this guide rod integrated into the protective cover not only undertakes the pressure transmission function but also serves as a guide for the regulating rod, reducing the need for additional guiding components, optimizing the internal space layout of the regulating valve, and reducing assembly complexity. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below.

[0019] Figure 1 A cross-sectional structural schematic diagram of the high-pressure regulating valve provided by this utility model;

[0020] Figure 2 for Figure 1 A partially enlarged schematic diagram of the high-pressure regulating valve shown in the figure;

[0021] Figure 3 For Figure 1 Structure diagram of lower protective cover.

[0022] Explanation of reference numerals: 1, valve body; 10, medium passage; 2, valve cover; 21, pressure regulating cavity; 3, upper diaphragm; 4, lower diaphragm; 5, pressure regulating rod; 50, valve disc; 51, sealing connecting piece; 52, diaphragm seat; 53, first sealing ring; 54, second sealing ring; 6, pressure regulating spring; 7, adjusting screw; 8, protective cover; 80, limiting cavity; 81, upper protective cover; 82, lower protective cover; 83, guide rod; 84, guide hole; 9, pressure guide pipe. DETAILED DESCRIPTION

[0023] The technical solutions of the present application will be described clearly and completely below with reference to the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0024] In the description of the present application, it should be noted that the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0025] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0026] In addition, the technical features involved in different embodiments of the present application described below can be combined with each other as long as there is no conflict.

[0027] Embodiment

[0028] The present embodiment will be described in detail below with reference to the drawings:

[0029] The present embodiment provides a method for Figures 1-3The high-pressure pressure regulating valve shown in the application comprises a valve body 1, a pressure regulating mechanism, the valve body 1 comprises a medium channel 10 and a valve port arranged in the medium channel 10, the valve cover 2 comprises a pressure regulating cavity 21 communicating with the medium channel 10, a protective cover 8 is arranged at the center hole between the valve body 1 and the valve cover 2, and a limiting cavity 80 is formed around the center hole by the protective cover 8, the pressure regulating mechanism comprises an upper diaphragm 3 arranged in the pressure regulating cavity 21 and a lower diaphragm 4 arranged in the limiting cavity 80, and a pressure regulating rod 5 is arranged to move through the protective cover 8 to connect the upper diaphragm 3 and the lower diaphragm 4, the protective cover 8 surrounds the lower diaphragm 4, the protective cover 8 is provided with a guide hole 84 communicating the limiting cavity 80 and the medium channel 10, and the pressure regulating rod 5 passes through the guide hole 84 and is provided with a valve disc 50 matched with the valve port.

[0030] In the above embodiment, the protective cover 8 is arranged at the center hole between the valve body 1 and the valve cover 2, and the limiting cavity 80 surrounding the lower diaphragm 4 is formed around the center hole, the protective cover 8 is provided with the guide hole 84 communicating the limiting cavity 80 and the medium channel 10, so that the gas in the medium channel 10 enters the limiting cavity 80 through the guide hole 84 to press the lower diaphragm 4 to elastically deform, and the structure has the advantages that, first, the physical constraint of the protective cover 8 and the limiting cavity 80 can prevent the lower diaphragm 4 from over-expanding or stretching under high pressure, so as to avoid material fatigue or permanent deformation caused by over-limit deformation, and prolong the service life; second, the limiting cavity 80 can reduce the abnormal vibration of the diaphragm under high-frequency pressure fluctuation, avoid the outlet pressure fluctuation caused by the diaphragm shaking, ensure that the deformation amount of the lower diaphragm 4 is controlled within a reasonable range, make the linkage response of the lower diaphragm 4 and the adjusting mechanism more linear, and improve the sensitivity and reliability of pressure regulation.

[0031] The specific arrangement of the protective cover will be described in detail below. Figures 2-3 The specific arrangement of the protective cover will be described in detail below.

[0032] The protective cover 8 comprises an upper protective cover 81 and a lower protective cover 82 arranged opposite to each other at both ends of the center hole, and a limiting cavity 80 formed between the upper protective cover 81 and the lower protective cover 82, the protective cover 8 is installed by the upper protective cover 81 and the lower protective cover 82 to form a physical barrier surrounding the lower diaphragm 4, which can not only limit and protect the lower diaphragm 4, but also block the external impurities (such as dust, oil stains and particulate matter) from directly contacting the diaphragm surface, and this structure design can improve the reliability, environmental adaptability and long-term stability of the diaphragm through the physical limiting and protection mechanism, while ensuring the core function (pressure stable control) of the pressure regulating valve, prolong the service life, reduce the maintenance frequency and spare parts cost.

[0033] Further preferably, the lower protective cover 82 is provided with a guide rod 83 extending to the valve port along the moving direction of the pressure regulating rod 5, the guide rod 83 is provided with a guide hole 84 extending in the same direction, the pressure regulating rod 5 moves through the guide rod 83, and an air gap is left between the guide rod 83 and the pressure regulating rod 5. With this structure, on the one hand, the guide rod 83 provides accurate axial movement guide for the pressure regulating rod 5, limits the radial deviation or swing of the pressure regulating rod 5, and ensures that the cooperation between the valve disc 50 and the valve port is always centered; on the other hand, according to the guide hole 84 of the guide rod 83, the inlet pressure of the medium channel 10 is quickly transmitted to the intermediate diaphragm through the guide hole 84, which ensures that the diaphragm is more sensitive to pressure changes. As can be seen, the guide rod integrated in the protective cover not only has the pressure transmission function, but also has the guiding effect on the pressure regulating rod, reducing the need for additional guiding components, optimizing the internal space layout of the pressure regulating valve, and reducing the assembly complexity.

[0034] In the embodiment, the upper diaphragm 3 divides the pressure regulating cavity 21 into an upper pressure cavity and a lower pressure cavity, the pressure regulating mechanism includes a pressure regulating spring 6 arranged in the upper pressure cavity and pressing against one side of the upper diaphragm 3, the pressure regulating rod 5 is connected to the other side of the lower diaphragm through a connecting structure, and a pressure guide pipe 9 is arranged between the lower pressure cavity and the medium channel 10. Specifically, the connecting structure includes a sealing connector 51 fixedly arranged at the center of the upper diaphragm 3 and a diaphragm seat 52 connected to the pressure regulating rod 5, and the diaphragm seat 52 is threadedly connected to the sealing connector 51, so as to realize the linkage of the pressure regulating rod 5 and the upper diaphragm 3. With this structure, the pressure of the medium channel 10 is introduced into the lower pressure cavity in real time through the pressure guide pipe 9, and the pressure of the upper pressure cavity (the pressure of the pressure regulating spring 6 acting on the upper diaphragm 3) is combined, so as to drive the upper diaphragm 3 to reciprocate through the pressure difference between the upper and lower pressure cavities, realize the accurate control of the pressure regulating rod 5, and cooperate with the lower diaphragm 4 to be highly sensitive to the pressure difference change, so as to quickly drive the pressure regulating rod 5 to adjust the valve disc position, shorten the adjustment lag when the pressure fluctuates, and enhance the stability and improve the system dynamic response speed.

[0035] As Figures 1-2As shown, the lower diaphragm 4 is connected with the pressure regulating rod 5 through the diaphragm seat 52, the limiting cavity 80 is divided into two sealed cavities by the lower diaphragm 4, the medium channel 10 includes an inlet channel and an outlet channel arranged on both sides of the valve port, the cavity on the lower side of the lower diaphragm is communicated with the inlet channel through a conduit, the pressure guide pipe 9 is communicated with the outlet channel, the outer side of the lower diaphragm 4 is fixed between the protective cover 8 and the upper cover, the inner side of the lower diaphragm 4 is fixed on the diaphragm seat 52, the side wall of the diaphragm seat 52 is provided with an annular connecting groove embedded with the lower diaphragm 4, so as to realize the linkage and cooperation of the pressure regulating rod 5 and the lower diaphragm 4, the diaphragm seat 52 is movably arranged in the limiting cavity 80, and the upper protective cover 81 is provided with an opening through which the diaphragm seat 52 passes. Through the above structure, the high-pressure gas enters the limiting cavity 80 where the lower diaphragm 4 is arranged through the conduit, so that the lower diaphragm is expanded under pressure. However, since the space is sealed by the upper protective cover 81, the lower diaphragm can only expand in a limited space, thereby avoiding being broken by the high-pressure gas, so that the inlet pressure can be borne.

[0036] Further preferably, the sealing connector 51 is fastened to the upper diaphragm 3 through a fixing nut, a first sealing ring 54 is arranged between the diaphragm seat 52 and the sealing connector 51, the sealing property between the diaphragm seat 52 and the upper diaphragm 3 can be ensured through the first sealing ring 54, so as to avoid leakage of the upper diaphragm 3, and a second sealing ring 53 is arranged between the sealing connector 51 and the lower diaphragm 4, the sealing property between the diaphragm seat 52 and the sealing connector 51 can be ensured through the second sealing ring 53.

[0037] As shown in the figure, Figure 1 As shown, the valve cover 2 includes a cylindrical cavity connected with the upper pressure cavity and an adjusting screw 7 screwed in the cylindrical cavity, one end of the pressure regulating spring 6 abuts against the adjusting screw 7, and the other end abuts against the upper diaphragm 3. By rotating the adjusting screw 7, the compression amount of the pressure regulating spring 6 can be finely adjusted, so as to linearly change the pre-tightening force of the pressure regulating spring 6 on the upper diaphragm, finally realizing accurate adjustment of the outlet pressure, meeting different working conditions, when the outlet pressure increases, the force of the lower pressure cavity on the upper diaphragm increases, so as to push the upper diaphragm to move upwards to overcome the spring force, and link the pressure regulating rod to close the valve port, forming a closed-loop pressure regulating control, and automatically restoring the set pressure, so as to keep the outlet pressure of the pressure regulating valve stable.

[0038] Obviously, the above embodiments are only examples for clearly illustrating, but not limiting the embodiments. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. All the embodiments do not need to be exhausted, and the obvious changes or variations still fall within the protection scope of the utility model.

Claims

1. A high-pressure pressure regulating valve comprising a valve body (1), a valve cover (2) and a pressure regulating mechanism, the valve body (1) comprising a medium passage (10) provided with a valve port, the valve cover (2) comprising a pressure regulating chamber (21) communicating with the medium passage (10), characterized in that: The valve body (1) and the valve cover (2) are provided with a protective cover (8) at the center hole and a limiting cavity (80) formed by the protective cover (8) around the center hole, the pressure regulating mechanism comprises an upper diaphragm (3) arranged in the pressure regulating cavity (21) and a lower diaphragm (4) arranged in the limiting cavity (80), and a pressure regulating rod (5) moving through the protective cover (8) and connecting the upper diaphragm (3) and the lower diaphragm (4), the protective cover (8) surrounds the lower diaphragm (4), the protective cover (8) is provided with a guide hole (84) communicating the limiting cavity (80) and the medium channel (10), the pressure regulating rod (5) passes through the guide hole (84) and is provided with a valve disc (50) cooperating with the valve port.

2. A high pressure pressure regulating valve according to claim 1, characterized in that: The protective cover (8) comprises an upper protective cover (81) and a lower protective cover (82) oppositely arranged at both ends of the center hole, and a limiting cavity (80) formed between the upper protective cover (81) and the lower protective cover (82).

3. A high pressure pressure regulating valve according to claim 2, characterized in that: The lower protective cover (82) is provided with a guide rod (83) extending to the valve port along the moving direction of the pressure regulating rod (5), the guide rod (83) is provided with a guide hole (84) extending in the same direction as the guide rod (83), the pressure regulating rod (5) moves through the guide rod (83), and an air gap is left between the guide rod (83) and the pressure regulating rod (5).

4. The high pressure pressure regulating valve according to claim 1, characterized in that: The upper diaphragm (3) divides the pressure regulating cavity (21) into an upper pressure cavity and a lower pressure cavity, the pressure regulating mechanism comprises a pressure regulating spring (6) arranged in the upper pressure cavity and pressing against one side of the upper diaphragm (3), the pressure regulating rod (5) is connected to the other side of the lower diaphragm through a connecting structure, and a pressure guide pipe (9) is arranged between the lower pressure cavity and the medium channel (10).

5. A high pressure pressure regulating valve according to claim 4, characterized in that: The connecting structure comprises a sealing connector (51) fixedly arranged at the center of the upper diaphragm (3), and a diaphragm seat (52) connected to the pressure regulating rod (5), the diaphragm seat (52) is threadedly fixedly connected to the sealing connector (51).

6. A high pressure pressure regulating valve according to claim 5, characterized in that: The lower diaphragm (4) is connected to the pressure regulating rod (5) through the diaphragm seat (52), the limiting cavity (80) is divided by the lower diaphragm (4) to form two sealed cavities, the medium channel (10) comprises an air inlet channel and an air outlet channel arranged on both sides of the valve port, the cavity on the lower side of the lower diaphragm is communicated with the air inlet channel through a guide pipe, and the pressure guide pipe (9) communicates with the air outlet channel.

7. A high pressure pressure regulating valve according to claim 6, characterized in that: The outer side of the lower diaphragm (4) is fixed between the protective cover (8) and the upper cover, the inner side of the lower diaphragm (4) is fixed on the diaphragm seat (52), and an annular connecting groove is arranged on the side wall of the diaphragm seat (52) and embedded with the lower diaphragm (4).

8. A high pressure pressure regulating valve according to any one of claims 5-7, characterized in that: The sealing connector (51) is fastened to the upper diaphragm (3) through a fixing nut, a first sealing ring (54) is arranged between the diaphragm seat (52) and the sealing connector (51), and a second sealing ring (53) is arranged between the sealing connector (51) and the lower diaphragm (4).

9. A high pressure pressure regulating valve according to claim 8, characterized in that: The diaphragm seat (52) is movably accommodated in the limiting cavity (80), and the upper protective cover (81) of the protective cover is provided with an opening through which the diaphragm seat (52) passes.

10. The high pressure pressure regulating valve according to claim 4, characterized in that: The valve cover (2) comprises a cylindrical cavity connected with the upper compression cavity and an adjusting screw (7) screwed in the cylindrical cavity, one end of the pressure regulating spring (6) abutting against the adjusting screw (7) and the other end abutting against the upper diaphragm (3).

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