Fuel gas pressure regulating valve

Abstract

The utility model discloses a fuel gas pressure regulating valve. Comprising a valve body and an upper cover body. A valve rod is arranged in the valve cavity; the valve rod is located below the upper cover body, a positioning mechanism is arranged on one side of the valve rod, and a first limiting part and a second limiting part are arranged on the valve rod and movably connected with the rocker arm at the air inlet end; positioning parts are arranged at the top ends of the positioning mechanisms; the first limiting part and the second limiting part are located on the two sides of the positioning part, the first limiting part is detachably connected with a lifting rod in the upper cover body or the positioning part, and the maximum descending stroke is larger than the maximum attenuation value of the pressure adjusting spring; the second limiting part is detachably connected with the positioning part, and the maximum ascending stroke is smaller than the maximum attenuation value of the pressure adjusting spring. The first limiting part and the second limiting part are detachably connected with the positioning mechanism, correspondingly counteract variables of gradual increase of an upward force value and gradual attenuation of a downward force value of the pressure adjusting spring, and enable a difference value between the variable values and a set intermediate value to be reduced to an optimal point position. Therefore, fluctuation of output pressure is reduced, and pressure regulating precision is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a gas pressure regulating valve. Background Art

[0002] A gas pressure regulator, commonly known as a pressure reducing valve, is a device that automatically changes the gas flow through the regulating valve to maintain a specified pressure at the outlet. As a key device for gas use, the gas pressure regulator's regulation accuracy is crucial, determining the stability and accuracy of the gas supply. Pressure regulation accuracy is reflected in minimal fluctuations in the output pressure within a set range. Existing pressure regulators primarily regulate outlet pressure by balancing the pressure-regulating spring with the air pressure within the valve cavity through the expansion and contraction of the spring. The upper chamber of the diaphragm in the pressure regulator houses the spring, while the air pressure in the lower chamber is derived from the pressure at the regulator's outlet. The force of the spring is balanced by the air pressure in the lower chamber. Specifically, when the user's gas consumption increases, the outlet pressure decreases, and at the same time, the pressure in the sub-diaphragm cavity decreases, causing the diaphragm to move downward, driving the pull rod and one end of the rocker arm down together, pulling the pressure-regulating spring to stretch, and the rocker arm pulling the valve head toward the valve body, increasing the opening of the pressure regulator valve port, increasing the air intake in the valve cavity, balancing the force of the pressure-regulating spring, and increasing the outlet pressure, thereby ensuring gas consumption. When the outlet gas consumption decreases, the effect is the opposite of the above process. When the outlet stops using gas, the valve head is still in the open state. Due to the inlet and outlet pressure difference, the outlet pressure rises, and the pressure in the sub-diaphragm cavity increases, driving the valve stem and one end of the rocker arm upward. The valve head connected to the valve stem at the air intake end moves away from the valve body until the valve head and valve port are closed. At this time, the outlet pressure remains stable. This is the principle of pressure balance of existing gas pressure regulators. The pressure regulator uses the gas diaphragm and pressure-regulating spring to respond to changes in the air pressure in the valve cavity, continuously adjusting the valve opening to keep the gas pressure entering the pressure regulator within the set range and maintain the pressure regulation accuracy of the pressure regulator. The pressure regulation accuracy of the pressure regulator is related to the pressure of the air pressure in the valve cavity below the diaphragm and the spring force of the pressure-regulating spring. To improve the pressure regulation accuracy of the pressure regulator, the existing technologies use the following methods: 1. Increasing the arm distance of the rocker arm and increasing the area of ​​the diaphragm; 2. Adjusting the stiffness of the pressure-regulating spring. The drawbacks of these two methods are:

[0003] Excessively increasing the diaphragm area or the rocker arm length requires increasing the valve body cross-section, which results in an increase in the overall volume and weight of the valve body, making the overall volume of the pressure regulator too large and the appearance uncoordinated. On the other hand, as the diaphragm area increases or the rocker arm length increases, the air flow entering the valve cavity increases, and the air pressure acting on the diaphragm increases, the diaphragm is overly stressed, and the service life of the diaphragm is shortened.

[0004] Regarding the stiffness of the pressure regulating spring, when the effective area of ​​the pressure regulator diaphragm and the valve core formation are determined, if the stiffness of the pressure regulating spring is increased, the greater the stiffness of the pressure regulating spring, the more obvious the spring effect of the pressure regulating spring, resulting in a larger range of pressure regulator outlet pressure variation and lower pressure regulation accuracy. However, if the spring stiffness is reduced too much, the degree of freedom of the spring will be high, the compression distance of the spring will increase, the opening of the valve port will be larger, and the upper limit of the air pressure in the valve cavity will increase, which may easily lead to safety accidents. Utility Model Content

[0005] In view of this, the present application provides a gas pressure regulating valve, which, through the detachable connection of the first and second limit portions to the positioning portion, respectively, offsets the spring effect of the pressure regulating spring in the upper cover, reduces the attenuation variable of the pressure regulating spring, maintains the gas pressure in the pressure regulator stable, keeps the outlet pressure within a stable range, and thus improves the pressure regulation accuracy of the pressure regulator. The specific solution is as follows:

[0006] A gas pressure regulating valve comprises a valve body and an upper cover, wherein a valve cavity is provided in the valve body, one end of the valve body is an air inlet end, and the other end of the valve body is an air outlet end. The valve cavity is provided in the valve body, the upper cover is mounted on the valve cavity, and a valve stem and a positioning mechanism are provided in the valve cavity;

[0007] The valve stem is located below the upper cover, a positioning mechanism is provided on one side of the valve stem, a first limiting portion and a second limiting portion are provided on the valve stem at intervals, one end of the valve stem faces the upper cover, and the other end of the valve stem is movably connected to the rocker arm at the intake end;

[0008] The bottom end of the positioning mechanism is mounted on the inner wall of the bottom of the valve body, and the top end of the positioning mechanism is provided with a positioning portion;

[0009] The first limiting portion and the second limiting portion are arranged along the extension direction of the valve stem. The first limiting portion and the second limiting portion are respectively located on the upper and lower sides of the positioning portion. The first limiting portion is installed on the top end of the valve stem, and the second limiting portion is installed on the rod body of the valve stem.

[0010] The first limit portion is detachably connected to the positioning portion or the end of the lifting rod in the upper cover body that extends into the valve cavity, and controls whether to move synchronously based on the connection relationship with the lifting rod. The maximum downward movement stroke of the first limit portion is equal to the maximum attenuation value of the pressure-adjusting spring in the upper cover body. The first limit portion controls the connection relationship with the positioning portion based on its own movement stroke;

[0011] The second limiting part is detachably connected to the positioning part, the maximum upward movement stroke of the second limiting part is less than the maximum attenuation value of the pressure-adjusting spring in the upper cover body, and the second limiting part controls the connection relationship with the positioning part according to its own movement stroke.

[0012] Preferably, the first limiting portion and the positioning portion, the end of the lifting rod extending into the valve cavity, and the second limiting portion and the positioning portion are magnetically connected.

[0013] Preferably, the magnetic poles of the first limiting portion and the second limiting portion are opposite;

[0014] The valve stem is a non-magnetic rod;

[0015] One end of the lifting rod extending into the valve cavity is a magnetic member, and the magnetic pole is opposite to the first limiting portion.

[0016] Preferably, the first limiting portion and the second limiting portion respectively include a protective cover and a magnet disposed in the protective cover;

[0017] The protective sleeve is connected to the valve stem;

[0018] The magnet is installed in the protective cover.

[0019] Preferably, the positioning portion includes an annular positioning groove provided near the top of the positioning mechanism;

[0020] The annular positioning groove is located between the first limiting portion and the second limiting portion, and an annular positioning plate is provided on the annular positioning groove;

[0021] The annular positioning plate is sleeved on the annular positioning groove and slides up and down in the annular positioning groove. The annular positioning plate is detachably connected to the first limiting portion and the second limiting portion respectively.

[0022] Preferably, the height of the annular positioning groove is the same as the thickness of the sealing gasket at the air inlet end of the valve body.

[0023] Preferably, the annular positioning plate is a metal part.

[0024] Compared with the prior art, the present invention has the following advantages:

[0025] The present invention provides a valve stem with a first and a second limiting portion on one side of the valve stem facing the positioning mechanism, a positioning mechanism on one side of the valve stem, a positioning portion at the top of the positioning mechanism, and a positioning portion located between the first and second limiting portions. The first limiting portion is detachably connected to an end of a lifting rod in the upper cover that extends into the valve cavity, and controls whether to move synchronously based on its connection with the lifting rod. By setting the maximum downward movement stroke of the first limiting portion equal to the maximum attenuation value of the pressure regulating spring in the upper cover, the first limiting portion controls its connection with the positioning portion based on its own movement stroke to compensate for the variable value of the pressure regulating spring gradually attenuating during the downward movement of the valve stem. By setting the maximum upward movement stroke of the second limiting portion less than the maximum attenuation value of the pressure regulating spring in the upper cover, the second limiting portion controls its connection with the positioning portion based on its own movement stroke to offset the increase in attenuation of the pressure regulating spring during the upward movement of the valve stem, thereby reducing the difference between the change in attenuation value of the pressure regulating spring of the pressure regulator and the middle value of the set range to an optimal value, reducing the fluctuation of the air pressure in the pressure regulator, maintaining a constant output pressure, and improving the pressure regulation accuracy.

[0026] The present application sets the maximum upward movement stroke of the second limit part to be smaller than the maximum compression of the pressure-regulating spring in the upper cover body, thereby reducing the upper limit of safety. After the second limit part is connected with the positioning part during the upward process, the air pressure in the valve cavity is lower than the upper limit of the specified safety air pressure, thereby avoiding the air pressure in the valve cavity exceeding the safety value and causing dangerous accidents, thereby improving the safety performance of the gas pressure regulating valve.

[0027] In the present application, the detachable connection between the first limiting part and the second limiting part and the positioning part is a magnetic connection. When the air pressure in the valve cavity changes, the valve stem drives the first limiting part and the second limiting part to move upward or downward. When the first limiting part or the second limiting part moves to the effective magnetic attraction range with the positioning part, the first limiting part or the second limiting part and the positioning part can be spontaneously connected through magnetic adsorption. When the valve stem moves downward, the stretching amount of the pressure regulating spring or the compression amount of the pressure regulating spring when the valve stem moves upward is maintained within the set range, so that the air pressure at the outlet end is always within a stable range. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the result of a gas pressure regulating valve for this application;

[0029] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0030] Figure 3 This is a schematic structural diagram of the upper cover body in an embodiment of the present application;

[0031] Figure 4 This is a schematic diagram of the connection between the protective cover and the valve stem in an embodiment of the present application;

[0032] Figure 5 for Figure 1 Enlarged view of point B in the middle;

[0033] Figure 6 Schematic diagram of the positional relationship between the first limiting portion, the second limiting portion, and the annular positioning plate in an embodiment of the present application;

[0034] Description of parts and reference numerals:

[0035] 1. Air guide rod; 2. Sealing port; 3. Valve head; 4. Air inlet channel; 5. Rocker arm; 6. Valve cover; 7. First limiting part; 8. One end of the lifting rod extending into the valve cavity; 9. Hand cover; 10. Pressure-regulating spring; 11. Lifting torque; 12. Lifting rod; 13. Diaphragm; 14. Annular positioning plate; 15. Annular positioning groove; 16. Second limiting part; 17. Connecting groove; 18. Valve stem; 19. Sealing gasket; 20. Protective cover; 21. Block. DETAILED DESCRIPTION

[0036] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0037] See also Figure 1-5 The utility model provides a gas pressure regulating valve, comprising a valve body and an upper cover body:

[0038] A valve cavity is provided in the valve body, one end of the valve body is an air inlet end, and the other end of the valve body is an air outlet end. The valve cavity is provided in the valve body, and the upper cover is installed on the valve cavity. It is characterized in that a valve stem is provided in the valve cavity;

[0039] The valve stem is located below the upper cover, a positioning mechanism is provided on one side of the valve stem, a first limiting portion and a second limiting portion are provided on the valve stem at intervals, one end of the valve stem faces the upper cover, and the other end of the valve stem is movably connected to the rocker arm at the intake end;

[0040] The bottom end of the positioning mechanism is mounted on the inner wall of the bottom of the valve body, and the top end of the positioning mechanism is provided with a positioning portion;

[0041] The first limiting portion and the second limiting portion are arranged along the extension direction of the valve stem. The first limiting portion and the second limiting portion are respectively located on the upper and lower sides of the positioning portion. The first limiting portion is installed on the top end of the valve stem, and the second limiting portion is installed on the rod body of the valve stem.

[0042] The first limiting portion is detachably connected to an end of the lifting rod in the upper cover body that extends into the valve cavity, and controls whether to move synchronously based on the connection relationship with the lifting rod. The maximum downward movement stroke of the first limiting portion is equal to the maximum attenuation value of the pressure-adjusting spring in the upper cover body. The first limiting portion controls the connection relationship with the positioning portion based on its own movement stroke;

[0043] The maximum upward movement stroke of the second limiting portion is less than the maximum attenuation value of the pressure-adjusting spring in the upper cover body, and the second limiting portion controls the connection relationship with the positioning portion according to its own movement stroke.

[0044] The upper cover body in this application is a conventional upper cover body structure in this industry, which includes a valve cover 6, a pressure regulating spring 10 and a lifting rod 12 arranged in the valve cover 6, a hand cover 9 and a lifting knob 11 arranged on the top of the valve cover 6, and a membrane 13 clamped between the valve cover 6 and the valve body;

[0045] The valve cover 6 is detachably connected to the top of the valve body; the hand cover 9 has an M-shaped vertical section and is buckled onto the top of the valve cover 6. The hand cover 9 moves in the vertical direction of the valve cover 6; the lifting button 11 is located above the bottom plate of the hand cover 9;

[0046] The top end of the lifting rod 12 is detachably connected to the lifting twist 11 by means of but not limited to bolts / screws, and the bottom end of the lifting rod 12 is fixedly connected to the membrane 13 through the membrane, and the lifting rod 12 moves synchronously with the lifting twist 11 along the extension direction of the valve cover 6; the pressure-regulating spring 10 is sleeved in the middle part of the hand cover 9, one end of the pressure-regulating spring 10 is connected to the inner side of the top of the hand cover 9, and the other end of the pressure-regulating spring 10 is connected to the tray of the membrane 13; wherein the tray is located on the side of the membrane facing away from the valve cavity, and the tray is sleeved on the lifting rod 12, and is connected to the body sensor 12 and the membrane 13 respectively.

[0047] The hand cover 9 is movably buckled on the top of the valve cover 6 to cover the top of the valve cover 6. The membrane is located at the bottom of the valve cover 6. The bottom of the valve cover 6 is pressed against the edge of the membrane to cover the bottom of the valve cover 6. The connection between the valve cover 6, the hand cover 9 and the membrane respectively constitutes the upper cover structure of the gas pressure regulating valve.

[0048] A valve cavity is provided in the valve body, one end of the valve body is an air inlet end, and the other end of the valve body is an air outlet end;

[0049] The valve cavity is communicated with the air inlet end and the air outlet end respectively.

[0050] In the application, as in the conventional structure of the industry, a horizontal valve stem assembly is provided at the intake end, and the horizontal valve stem assembly includes an air guide rod 1, a valve head 3 and a rocker arm 5 arranged in sequence along the direction of the intake air flow;

[0051] The air guide rod 1 is a hollow air guide rod, which is threadedly connected to the inner wall of the air inlet end of the valve body. The air inlet end of the air guide rod 1 is connected to the air inlet pipe, and the air outlet end of the air guide rod 1 is a tapered air outlet to travel high-pressure airflow;

[0052] A gap is set between the valve head 3 and the inner wall of the air inlet end of the valve body to form an air inlet channel 4. The valve head 3 is a horizontal T-shaped structure as a whole. The end of the valve head 3 facing the air guide rod 1 is provided with a sealing port 2 that matches the shape and size of the air outlet end of the air guide rod 1. The end of the valve head 3 facing the valve cavity passes through the valve body and extends into the valve cavity. A sealing gasket 19 is provided between the valve head 3 and the valve body. The peripheral side of the sealing gasket 19 presses against the inner wall of the air inlet end of the valve body. The two ends of the sealing gasket 19 respectively press against the side of the valve body facing the valve head and the inner wall of the valve body between the valve head and the valve cavity.

[0053] The rocker arm 5 is an L-shaped structure with an opening upward, and the corner of the rocker arm 5 is rotatably connected to the valve body, and one end of the rocker arm 5 is rotatably connected to the end of the valve head 3 extending into the valve cavity (achieved through a connecting port and a limit column, wherein the limit column is fixed on the valve body and the connecting port is sleeved outside the limit column), and the other end of the rocker arm 5 is movably connected to the valve stem 18; the movably connection between the rocker arm 5 and the valve stem 18 is achieved through a connecting groove 17, and a connecting groove 17 is provided at one end of the valve stem 18 near the bottom, and the connecting groove 17 is composed of two trapezoids arranged in a mirror image, and the upper bottom of the trapezoidal structure is located on the inner side, and the end of the rocker arm 5 near the connecting rod is arc-shaped, and the arc-shaped end of the rocker arm 5 rotates around the connection between the two trapezoids.

[0054] A positioning mechanism and a valve stem 18 are provided in the valve cavity;

[0055] The valve stem 18 is located directly below the upper cover. A positioning mechanism is provided on one side of the valve stem 18. A first limiting portion 7 and a second limiting portion 16 are provided at intervals on the side of the valve stem 18 facing the positioning mechanism. One end of the valve stem 18 faces the upper cover, and the other end of the valve stem is movably connected to the rocker arm 5 at the intake end.

[0056] The bottom end of the positioning mechanism is mounted on the inner wall of the bottom of the valve body, and the top end of the positioning mechanism is provided with a positioning portion;

[0057] The first limiting portion 7 and the second limiting portion 16 are arranged along the extension direction of the valve stem 18. The first limiting portion 7 and the second limiting portion 16 are respectively located on the upper and lower sides of the positioning portion. The first limiting portion 6 is installed on the top end of the valve stem 18, and the second limiting portion 16 is installed on the rod body of the valve stem 18.

[0058] The first limiting portion 7 is detachably connected to the lifting rod 12 in the upper cover body. The valve stem 18 is magnetically connected to one end of the lifting rod 12 that passes through the membrane and extends into the valve cavity through the top of the first limiting portion 7, so that the valve stem 18 can move vertically together with the lifting rod 12 and the membrane as the air pressure in the valve cavity changes.

[0059] The valve stem 18 is magnetically connected to the positioning portion through the bottom of the first limiting portion 7;

[0060] The maximum downward movement stroke of the first limiting portion 7 is equal to the maximum stretching value of the pressure regulating spring 10;

[0061] The second limiting portion 16 is detachably connected to the positioning portion, and the maximum upward stroke of the second limiting portion 16 is less than the maximum compression value of the pressure-adjusting spring 10 in the upper cover body.

[0062] Furthermore, the first limiting portion 7 and the positioning portion, the end of the lifting rod 12 extending into the valve cavity, and the second limiting portion 16 and the positioning portion are magnetically connected.

[0063] Furthermore, the magnetic poles of the first limiting portion 7 and the second limiting portion 16 are opposite;

[0064] The valve stem 18 is a non-magnetic rod;

[0065] One end of the lifting rod 12 extending into the valve cavity is connected to a magnetic component, and the magnetic pole of the magnetic component is opposite to the magnetic pole of the first limiting portion 7.

[0066] The centers of the valve stem 18, the lifting rod 12, the first limiting portion 7 and the second limiting portion 16 are in a straight line;

[0067] Furthermore, a protective cover is provided outside the first limiting portion 7 and the second limiting portion 16;

[0068] The protective sleeve is mounted on the side of the valve stem facing the positioning portion. In one embodiment of the present application, the protective sleeve, the first limiting portion, and the second limiting portion are respectively annular in shape as a whole;

[0069] The first limiting portion 7 and the second limiting portion 16 are respectively engaged in the protective sleeve.

[0070] The protective sleeve 20 is connected to the rod body of the valve stem 18. The cross-section of the protective sleeve 20 is a U-shaped structure with the opening facing the upper cover body. A clamping block 21 is provided on the top of the protective sleeve 20. The first limiting part 7 and the second limiting part 16 are correspondingly provided with a clamping groove. When installing, the clamping groove is placed at the clamping block 21. After the first limiting part 7 and the second limiting part 16 are placed on the protective sleeve, the first limiting part 7 and the second limiting part 16 are rotated, and the clamping block 21 and the clamping groove are staggered so that the two do not correspond to each other, thereby completing the installation of the first limiting part 7 and the second limiting part 16.

[0071] Furthermore, the positioning portion includes an annular positioning groove 15 provided near the top of the positioning mechanism;

[0072] The annular positioning groove 15 is located between the first limiting portion 7 and the second limiting portion 16 , and an annular positioning plate 14 is provided on the annular positioning groove 15 ;

[0073] The annular positioning plate 14 is sleeved on the annular positioning groove 15 and slides up and down in the annular positioning groove 15 . The annular positioning plate 14 is detachably connected to the first limiting portion 7 and the second limiting portion 16 .

[0074] Furthermore, the height of the annular positioning groove 15 is the same as the thickness of the sealing gasket 19 at the air inlet end of the valve body.

[0075] Furthermore, the annular positioning plate 14 is a metal piece. In one embodiment of the present application, the annular positioning plate 14 is an iron plate.

[0076] Furthermore, the distance between the top of the annular positioning groove 15 and the bottom of the pressure-regulating spring 10 in the upper cover body in a natural state is greater than the maximum attenuation value of the pressure-regulating spring, and the distance between the bottom of the annular positioning groove 15 and the bottom of the pressure-regulating spring in the upper cover body in a natural state is less than the maximum safety stroke specified for the gas self-closing valve.

[0077] It should be noted that:

[0078] In one embodiment of the present application, the positioning mechanism is a column-shaped or rod-shaped structure.

[0079] In order to prevent the sealing gasket 19 at the air inlet end of the valve body from being deformed or worn due to long-term extrusion or thermal expansion and contraction, thereby causing the valve head 3 to slide toward the side of the gas guide rod 1 when the original gas pressure regulating valve is over-pressured, and the air outlet end of the gas guide rod 1 cannot be completely blocked, causing air leakage, the present application provides an annular positioning groove 15 on the circumferential side of the positioning mechanism near the top.

[0080] The annular positioning plate 14 is located in the annular positioning groove 15 and slides along the annular positioning groove 15. The overall height of the annular positioning groove 15 is equal to the thickness of the sealing gasket 19. When the gas pressure regulating valve is over-pressured, the valve stem 18 moves upward. The second limiter 16 provided on the valve stem 18 drives the annular positioning plate 14, which is magnetically connected to it, to move upward to compensate for the axial wear of the sealing gasket 19, thereby preventing gas leakage.

[0081] The first limiting portion 7 and the second limiting portion 16 are spaced apart from each other along the axial direction of the valve stem 18 .

[0082] The first limiting portion 7 and the second limiting portion 16 are arranged up and down and are respectively installed on the valve stem 18. In an embodiment of the present application, the first limiting portion 7 and the second limiting portion 16 are respectively plate-shaped or block-shaped structures.

[0083] When the gas pressure in the valve cavity of the gas pressure regulating valve is within the set range, the first limit part 7 and the end 8 of the lifting rod 12 extending into the valve cavity are detachably connected (i.e., magnetically connected). At this time, the valve head 3 is located between the gas guide rod 1 and the sealing gasket 19. At this time, the valve port formed between the sealing port 2 and the gas guide rod 1 is suitable for opening and closing, and a gap 4 is left between the valve head 3 and the sealing gasket 19, and normal ventilation is achieved. Figure 6 As shown: when the annular positioning plate 14 is in the middle position between the first limiting portion 7 and the second limiting portion 16, that is, the distance A from the first limiting portion 7 to the annular positioning plate 14 is the same as the distance B from the second limiting portion 16 to the annular positioning plate 14, at this time, the magnetic attraction forces of the first limiting portion 7 and the second limiting portion 16 and the annular positioning plate 14 are equal, and the pressure regulating value of the pressure regulating spring 10 is set to the standard value center line of the product pressure regulating accuracy (the setting value range of the relationship between gas pressure and flow);

[0084] As the air pressure flow in the valve cavity increases, the valve stem 18 drives the first limiting part 7 and the second limiting part 16 to move upward. At this time, the pressure-regulating spring 10 is compressed, and the pressure-regulating spring 10 acts on the valve stem 18, the first limiting part 7 and the second limiting part 16 to gradually increase the pressure value. At the same time, the distance A increases and the distance B decreases, the magnetic attraction force of the first limiting part 7 on the annular positioning plate 14 decreases, and the magnetic attraction force of the second limiting part 16 on the annular positioning plate 14 gradually increases, so that the pressure-regulating spring 10 acts on the valve stem 18, the first limiting part 7 and the second limiting part 16. The pressure value gradually decreases, thereby achieving the setting of the suction force variable of the second limiting part 16 on the annular positioning plate 14 to offset the partially increased pressure variable of the pressure-regulating spring 10, so that this variable can be controlled at the lowest ideal value.

[0085] When the valve stem 18 and the first and second limiter portions 7 and 16 move downward, the pressure regulating spring 10 extends, and the pressure regulating value acting on the valve stem 18, the first and second limiter portions 7 and 16 gradually decreases. At the same time, as distance A decreases and distance B increases, the magnetic attraction force of the first limiter portion 7 on the annular positioning plate 14 gradually increases, while the magnetic attraction force of the second limiter portion 16 on the annular positioning plate 14 gradually decreases. At this time, the pressure regulating value acting on the valve stem 18, the first and second limiter portions 7 and 16 gradually increases. By setting the variable of the magnetic attraction force of the annular positioning plate 14 by the first limiter portion 7, the pressure variable of the pressure regulating spring 10 that has partially attenuated is compensated, so that this variable can be controlled at the lowest ideal value, thereby improving the pressure regulating accuracy of the pressure regulator.

[0086] When the pressure-regulating spring 10 releases the compression potential energy and extends, the rocker arm 5 rotates clockwise around the connection with the valve stem 18, and the other end of the rocker arm 5 pushes one end of the valve cavity of the valve head 3 to move, thereby increasing the opening of the valve port to maintain the air pressure stability at the outlet end; and when the underpressure in the valve cavity exceeds the maximum attenuation value of the pressure-regulating spring 10, the lifting rod 12 falls off from the valve stem 8. At this time, the first limit part 7 is magnetically connected to the positioning part, and the rocker arm 5 pushes the valve head 3 to move toward one end of the air guide rod 1 until it abuts against the air guide rod 1. At this time, the valve port is completely closed, cutting off the air intake.

[0087] When the pressure in the valve chamber continues to increase, the diaphragm and the lifting rod 12 drive the valve stem 18 and one end of the rocker arm 5 to move upward synchronously, the pressure-regulating spring 10 is gradually compressed, and the rocker arm 5 rotates counterclockwise around the connection with the valve stem 18. The other end of the rocker arm 5 pushes the valve head 3 to move toward one end of the gas guide rod 1, reducing the opening of the valve port and reducing the air pressure at the outlet end; and when the air pressure in the valve chamber continues to increase until the second limit part 16 is magnetically connected to the annular positioning plate 14, the other end of the rocker arm 5 pushes the valve head 3 to one end of the gas guide rod 1 until the valve head 3 is completely in contact with the gas guide rod 1, and the air outlet of the gas guide rod 1 is blocked, thereby cutting off the air intake and ensuring the gas safety of the pressure regulating valve; and since the maximum upward stroke of the second limit part 16 is less than the maximum compression value of the pressure regulating spring 10, this reduces the safety upper limit value of the pressure regulating valve, thereby achieving the improvement of the safety of the gas pressure regulating valve while increasing the pressure regulating accuracy.

Claims

1. A gas pressure regulating valve, comprising a valve body and an upper cover, wherein a valve cavity is provided in the valve body, one end of the valve body is an air inlet end, and the other end of the valve body is an air outlet end. The valve cavity is provided in the valve body, and the upper cover is mounted on the valve cavity, characterized in that: A valve stem is provided in the valve cavity; The valve stem is located below the upper cover, a positioning mechanism is provided on one side of the valve stem, a first limiting portion and a second limiting portion are provided on the valve stem at intervals, one end of the valve stem faces the upper cover, and the other end of the valve stem is movably connected to the rocker arm at the intake end; The bottom end of the positioning mechanism is mounted on the inner wall of the bottom of the valve body, and the top end of the positioning mechanism is provided with a positioning portion; The first limiting portion and the second limiting portion are arranged along the extension direction of the valve stem. The first limiting portion and the second limiting portion are respectively located on the upper and lower sides of the positioning portion. The first limiting portion is installed on the top end of the valve stem, and the second limiting portion is installed on the rod body of the valve stem. The first limiting portion is detachably connected to an end of the lifting rod in the upper cover body that extends into the valve cavity, and controls whether to move synchronously based on the connection relationship with the lifting rod. The maximum downward movement stroke of the first limiting portion is equal to the maximum attenuation value of the pressure-adjusting spring in the upper cover body. The first limiting portion controls the connection relationship with the positioning portion based on its own movement stroke; The maximum upward movement stroke of the second limiting portion is less than the maximum attenuation value of the pressure-adjusting spring in the upper cover body, and the second limiting portion controls the connection relationship with the positioning portion according to its own movement stroke.

2. A gas pressure regulating valve according to claim 1, characterized in that: The first limiting portion and the positioning portion, the end of the lifting rod extending into the valve cavity, and the second limiting portion and the positioning portion are magnetically connected.

3. A gas pressure regulating valve according to claim 2, characterized in that: The magnetic poles of the first limiting portion and the second limiting portion are opposite; The valve stem is a non-magnetic rod; One end of the lifting rod extending into the valve cavity is a magnetic member, and the magnetic pole is opposite to the first limiting portion.

4. A gas pressure regulating valve according to claim 2, characterized in that: A protective cover is provided outside the first limiting portion and the second limiting portion; The cross section of the protective cover is a U-shaped structure with the opening facing the upper cover body, and the protective cover is installed on the side of the valve stem facing the positioning portion; The first limiting portion and the second limiting portion are respectively installed in the protective cover.

5. The gas pressure regulating valve according to claim 1, characterized in that: The positioning portion includes an annular positioning groove arranged near the top of the positioning mechanism; The annular positioning groove is located between the first limiting portion and the second limiting portion, and an annular positioning plate is provided on the annular positioning groove; The annular positioning plate is sleeved on the annular positioning groove and slides up and down in the annular positioning groove. The annular positioning plate is detachably connected to the first limiting portion and the second limiting portion respectively.

6. A gas pressure regulating valve according to claim 5, characterized in that: The height of the annular positioning groove is the same as the thickness of the sealing gasket at the air inlet end of the valve body.

7. The gas pressure regulating valve according to claim 5, characterized in that: The annular positioning plate is a metal part.

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