Fuel gas pressure regulator tending to be closed

Abstract

The utility model relates to the technical field of natural gas transmission and distribution, in particular to a gas pressure regulator tending to be closed, which comprises a main pressure regulating valve. The main pressure regulating valve comprises an upper shell, a lower shell, a main pressure regulating membrane arranged in the upper shell and the lower shell, a tray arranged on the main pressure regulating membrane, a pressure regulating spring and a pressure regulating screw plug which are arranged at the square end of the tray, a built-in diffusing unit arranged at the lower end of the pressure regulating spring and a valve body connected with the main pressure regulating valve, and a lever is hinged to the bottom of the inner wall of the lower shell; an ejector rod is installed in a valve rod channel of the main pressure regulating valve in a sliding mode, a balance valve element is arranged at the tail end of the ejector rod, a power acting point of the lever is hinged to the bottom of the tray, and a resistance acting point of the lever is hinged to the front end of the ejector rod. The utility model adopts the lever to amplify the acting force of the diaphragm, adopts the balance valve core to counteract the influence of inlet pressure and the like, ensures that the outlet pressure is stabilized within a certain range, and does not generate larger pressure fluctuation along with the change of flow.

Description

Technical Field

[0001] The utility model relates to the technical field of natural gas transmission and distribution, in particular to a gas pressure regulator tending to close. Background Technique

[0002] With the rapid development of the domestic natural gas industry, the domestic gas equipment industry has also developed rapidly. After more than forty years of development, the gas equipment manufacturing industry is now in a leading position in the world, with product quality, technical level, and production scale ranking among the top in the world. The gas equipment manufacturing standards have been continuously improved from scratch, forming a relatively high-level and complete system for the entire product process of gas equipment, including design, production, inspection, and maintenance. For important parameters of pressure regulator products, such as key parameters like pressure stabilization accuracy, cut-off accuracy, and closing pressure, our country already has its own standards, and major gas companies have also formulated more stringent enterprise standards based on national standards. The closing pressure of a gas pressure regulator is mainly determined by the design structure of the equipment itself and is an inherent performance of the pressure regulator, indicating the outlet pressure at zero flow on the static characteristic curve when the gas pressure regulator is closed.

[0003] Currently, the national standard for closing pressure is divided into 6 grades, SG2.5, SG5, SG10, SG15, SG20, SG25. The smaller the value, the higher the closing pressure grade, and the better the closing performance of the pressure regulator. Under the influence of atmospheric pressure, the higher the outlet pressure of the pressure regulator, the better the closing performance. However, when the outlet pressure is below 10 KPa, it is difficult to control the closing pressure of a direct-acting gas pressure regulator, and the value is relatively high. Content of the Utility Model

[0004] The purpose of the utility model is to solve the following disadvantages existing in the prior art: under the influence of atmospheric pressure, the higher the outlet pressure of the pressure regulator, the better the closing performance. However, when the outlet pressure is below 10 KPa, it is difficult to control the closing pressure of a direct-acting gas pressure regulator, and the value is relatively high. Therefore, a gas pressure regulator tending to close is proposed.

[0005] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0006] A gas pressure regulator tending to close includes a main pressure regulating valve. The main pressure regulating valve includes an upper housing, a lower housing, a main regulating diaphragm arranged in the upper housing and the lower housing, a tray arranged on the main regulating diaphragm, a pressure regulating spring and a pressure regulating plug arranged at the square end of the tray, an internal relief unit arranged at the lower end of the pressure regulating spring, and a valve body connected to the main pressure regulating valve. A dust cover is fixedly installed at the upper end of the upper housing;

[0007] The valve body includes an air inlet, an air outlet, and a valve port. The air inlet and the air outlet are both communicated with the valve port;

[0008] At the bottom of the inner wall of the lower housing, there is a hinged lever. A push rod is slidably installed in the valve rod passage of the main pressure regulating valve. One end of the push rod extends to the front end of the valve port. A balance valve core is provided at the end of the push rod. The balance valve core faces the valve port. The power action point of the lever is hinged to the bottom of the tray, and the resistance action point of the lever is hinged to the front end of the push rod.

[0009] A signal pipe is fixedly connected to the valve body. The end of the signal pipe away from the valve body is connected to the lower housing through an angle type ferrule joint. The signal pipe is communicated with the main pressure regulating valve.

[0010] Preferably, a valve port gasket is provided between the valve port and the balance valve core. The valve body is connected to the main pressure regulating valve through a hoop.

[0011] Preferably, the edge of the main regulating diaphragm is arranged between the upper housing and the lower housing. An air vent hole is provided on the upper housing, and a damper is installed in the air vent hole.

[0012] Preferably, the balance valve core includes a valve nozzle seat, a diaphragm seat, a valve gasket seat arranged in the valve rod passage, a main regulating valve nozzle sleeved on the valve gasket seat, a main regulating valve gasket fixedly installed at one end of the valve gasket seat, and a connecting rod slidably inserted into the valve gasket seat. One end of the connecting rod is connected to the main regulating valve gasket through a fixing bolt, and the other end of the connecting rod is connected to the push rod. A telescopic spring is sleeved on the connecting rod, and both ends of the telescopic spring are fixedly connected to the push rod and the valve nozzle seat respectively.

[0013] Preferably, a balance diaphragm is provided between the diaphragm seat and the valve gasket seat, and the edge of the balance diaphragm contacts the main regulating valve nozzle.

[0014] Preferably, a retaining ring and an O-ring are provided between the diaphragm seat and the valve nozzle seat, and both the retaining ring and the O-ring are sleeved on the connecting rod.

[0015] In the present utility model, the beneficial effects are as follows:

[0016] 1. By adopting measures such as using a lever to amplify the diaphragm acting force and using a balance valve core to offset the influence of the inlet pressure, for a lever type direct acting pressure regulator with a common matching balance valve core, when the pressure regulating spring is removed, its closing pressure is approximately 600 Pa. This pressure is generated because the metal valve port is pressed into the rubber valve port gasket, and a certain amount of press-in amount is required to achieve complete sealing. When the outlet pressure of the gas equipment is 3 KPa, the influence is relatively large, and its closing pressure accuracy is about SG20. It can ensure that the outlet pressure is stable within a certain range and does not generate large pressure fluctuations with the change of flow rate.

[0017] 2. Adjust the design of the balance valve core. According to the calculation, increase the effective force-bearing area of the balance diaphragm. In addition to the inlet pressure of the balance valve port, an additional pressing force between the valve port and the valve port gasket is added, so as to achieve the purpose of reducing the closing pressure, improving the closing pressure and the accuracy level of the closing pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 FIG. 1 is a schematic structural diagram of a pressure regulating valve in a gas pressure regulator tending to close according to the present invention;

[0019] Figure 2 FIG. 2 is a schematic structural diagram of a traditional balance valve core in a gas pressure regulator tending to close according to the present invention;

[0020] Figure 3 FIG. 3 is a schematic structural diagram of a redesigned balance valve core in a gas pressure regulator tending to close according to the present invention.

[0021] In the figures: 1 valve body, 2 balance valve core, 3 hoop, 4 upper housing, 5 built-in relief unit, 6 pressure regulating spring, 7 pressure regulating plug, 8 dust cover, 9 damper, 10 lower housing, 11 lever, 12 angle ferrule joint, 13 signal pipe, 14 valve port gasket, 15 valve port, 101 fixing bolt, 102 main regulating valve gasket, 103 main regulating valve nozzle, 104 valve gasket seat, 105 connecting rod, 106 balance diaphragm, 107 diaphragm seat, 108 nozzle seat, 109 telescopic spring, 110 ejector rod, 111 retaining ring, 112 O-ring. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0023] Refer to Figure 1, a gas pressure regulator tending to close, comprising a main pressure regulating valve. The main pressure regulating valve includes an upper housing 4, a lower housing 10, a main regulating diaphragm disposed within the upper housing 4 and the lower housing 10, a tray disposed on the main regulating diaphragm, a pressure regulating spring 6 and a pressure regulating plug 7 disposed at the square end of the tray, an internal relief unit 5 disposed at the lower end of the pressure regulating spring 6, and a valve body 1 connected to the main pressure regulating valve. A dust cover 8 is fixedly installed at the upper end of the upper housing 4. The valve body 1 includes an air inlet, an air outlet, and a valve port 15. Both the air inlet and the air outlet are communicated with the valve port 15. A lever 11 is hinged to the bottom of the inner wall of the lower housing 10. A push rod 110 is slidably installed within the valve rod passage of the main pressure regulating valve. One end of the push rod 110 extends to the front end of the valve port 15. A balance valve core 2 is provided at the end of the push rod 110. The balance valve core 2 faces the valve port 15. The power application point of the lever 11 is hinged to the bottom of the tray. The resistance application point of the lever 11 is hinged to the front end of the push rod 110. A valve port gasket 14 is provided between the valve port 15 and the balance valve core 2. The valve body 1 is connected to the main pressure regulating valve through a hoop 3;

[0024] The downstream air pressure acts on the main regulating diaphragm through a signal pipe 13 and an angle type ferrule joint 12 to generate an upward thrust. When the downstream pressure rises, the upward thrust is greater than the downward pressure generated by the compression of the pressure regulating spring 6. The main regulating diaphragm assembly moves upward, driving the lever 11 to rotate counterclockwise. While the lever 11 rotates counterclockwise, it drives the movable part within the balance valve core 2 to move leftward. The valve port gasket 14 approaches the valve port 15, reducing the upstream-to-downstream gas supply flow area, thereby reducing the gas supply volume to the downstream and preventing the continuous increase of the downstream outlet pressure;

[0025] When the downstream air pressure decreases, the upward thrust acting on the main regulating diaphragm through the signal pipe 13 and the angle type ferrule joint 12 is less than the downward pressure generated by the compression of the pressure regulating spring 6. The main regulating diaphragm assembly moves downward, driving the lever 11 to rotate clockwise. While the lever 11 rotates clockwise, it drives the movable part within the balance valve core 2 to move rightward. The valve port gasket 14 moves away from the valve port 15, increasing the upstream-to-downstream gas supply flow area, thereby increasing the gas supply volume to the downstream and preventing the continuous decrease of the downstream outlet pressure, ensuring that the outlet pressure is stable within a certain range and does not generate large pressure fluctuations with changes in flow rate.

[0026] The edge of the main regulating diaphragm is disposed between the upper housing 4 and the lower housing 10. The upper housing 4 is provided with a vent hole, and a damper 9 is installed within the vent hole. The entire pressure regulator operates in a dynamic balance state. The damper 9 is mainly to prevent the occurrence of surging phenomena caused by the system being too sensitive.

[0027] Reference Figures 2 - 3, the balance valve core 2 includes a valve nozzle seat 108, a diaphragm seat 107, a valve pad seat 104 arranged in the valve stem channel, a main regulating valve nozzle 103 sleeved on the valve pad seat 104, a main regulating valve pad 102 fixedly installed at one end of the valve pad seat 104, and a connecting rod 105 slidably inserted into the valve pad seat 104. One end of the connecting rod 105 is connected to the main regulating valve pad 102 through a fixing bolt 101, the other end of the connecting rod 105 is connected to the ejector rod 110, a telescopic spring 109 is sleeved on the connecting rod 105, and both ends of the telescopic spring 109 are fixedly connected to the ejector rod 110 and the valve nozzle seat 108 respectively. A balance diaphragm 106 is arranged between the diaphragm seat 107 and the valve pad seat 104, the edge of the balance diaphragm 106 contacts the main regulating valve nozzle 103, a retaining ring 111 and an O-ring 112 are arranged between the diaphragm seat 107 and the valve nozzle seat 108, and both the retaining ring 111 and the O-ring 112 are sleeved on the connecting rod 105;

[0028] In the traditional pressure regulating product, the effective area B of the balance diaphragm 106 is equal to the cross-sectional area A of the valve port 15, balancing the upward pressure of the inlet pressure on the main regulating valve pad 102, thereby reducing the upward pressure of the inlet pressure on the ejector rod 110 and achieving the purpose of reducing the closing pressure;

[0029] Compared with the traditional product according to the calculation, the new regulator product redesigned the internal structure of the new balance valve component, increased the effective area B of the balance diaphragm 106 to be larger than the flow area A of the valve port 15, generating an overall downward pressure difference, making the main regulating valve pad 102 automatically press against the valve port 15, offsetting part of the additional outlet pressure required to achieve a complete sealing effect between the closed valve port 15 and the main regulating valve pad 102, thereby achieving the purpose of reducing the closing pressure and improving the closing pressure accuracy. When the outlet pressure is 0.3 MPa and the outlet pressure is 3 KPa, the closing accuracy can be improved from the original SG20 to SG5, meeting the design requirements and effectively improving the closing pressure accuracy level.

[0030] In the present utility model, the downstream air pressure acts on the main regulating diaphragm through the signal pipe 13 and the angle type ferrule joint 12 to generate an upward thrust. When the downstream pressure rises, the upward thrust is greater than the downward pressure generated by the compression of the pressure regulating spring 6, the main regulating diaphragm assembly moves upward and drives the lever 11 to rotate counterclockwise. While the lever 11 rotates counterclockwise, it drives the moving parts inside the balance valve core 2 to move leftward, the valve port pad 14 approaches the valve port 15, reducing the upstream air supply flow area to the downstream and thus reducing the gas supply volume to the downstream, preventing the continuous increase of the downstream outlet pressure;

[0031] When the downstream air pressure decreases, the upward thrust acting on the main regulating diaphragm through the signal pipe 13 and the angle type ferrule joint 12 is less than the downward pressure generated by the compression of the pressure regulating spring 6. The main regulating diaphragm assembly moves downward, driving the lever 11 to rotate clockwise. While the lever 11 rotates clockwise, it drives the movable part inside the balance valve core 2 to move to the right, the valve port gasket 14 moves away from the valve port 15, increasing the upstream air supply flow area to the downstream, thereby increasing the gas supply volume to the downstream, preventing the continuous decrease of the downstream outlet pressure, ensuring that the outlet pressure is stable within a certain range, and not generating large pressure fluctuations with the change of flow rate.

[0032] The above is only the preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent replacements or changes, and should be covered within the protection scope of the present invention.

Claims

1. A gas pressure regulator tending to close, comprising a main pressure regulating valve, characterized in that, The main pressure regulating valve includes an upper housing (4), a lower housing (10), a main regulating diaphragm disposed within the upper housing (4) and the lower housing (10), a tray disposed on the main regulating diaphragm, a pressure regulating spring (6) and a pressure regulating plug (7) disposed at the square end of the tray, an internal relief unit (5) disposed at the lower end of the pressure regulating spring (6), and a valve body (1) connected to the main pressure regulating valve. A dust cover (8) is fixedly installed at the upper end of the upper housing (4); The valve body (1) includes an air inlet, an air outlet, and a valve port (15). Both the air inlet and the air outlet are in communication with the valve port (15); A lever (11) is hinged to the bottom of the inner wall of the lower housing (10). A push rod (110) is slidably installed within the valve rod passage of the main pressure regulating valve. One end of the push rod (110) extends to the front end of the valve port (15). A balance valve core (2) is provided at the end of the push rod (110). The balance valve core (2) faces the valve port (15). The power application point of the lever (11) is hinged to the bottom of the tray, and the resistance application point of the lever (11) is hinged to the front end of the push rod (110); A signal pipe (13) is fixedly connected to the valve body (1). The end of the signal pipe (13) remote from the valve body (1) is connected to the lower housing (10) through an angle ferrule joint (12). The signal pipe (13) is in communication with the main pressure regulating valve; 2. The gas pressure regulator tending to close according to claim 1, characterized in that, A valve port gasket (14) is provided between the valve port (15) and the balance valve core (2). The valve body (1) is connected to the main pressure regulating valve through a hoop (3); 3. A gas pressure regulator tending to close according to claim 1, characterized in that, The edge of the main regulating diaphragm is disposed between the upper housing (4) and the lower housing (10). The upper housing (4) is provided with a vent hole, and a damper (9) is installed within the vent hole; 4. A gas pressure regulator tending to close according to claim 1, characterized in that, The balance valve core (2) includes a valve nozzle seat (108), a diaphragm seat (107), a valve gasket seat (104) disposed within the valve rod passage, a main regulating valve nozzle (103) sleeved on the valve gasket seat (104), a main regulating valve gasket (102) fixedly installed at one end of the valve gasket seat (104), and a connecting rod (105) slidably inserted within the valve gasket seat (104). One end of the connecting rod (105) is connected to the main regulating valve gasket (102) through a fixing bolt (101). The other end of the connecting rod (105) is connected to the push rod (110). A telescopic spring (109) is sleeved on the connecting rod (105). The two ends of the telescopic spring (109) are fixedly connected to the push rod (110) and the valve nozzle seat (108) respectively; 5. A gas pressure regulator tending to close according to claim 4, characterized in that, A balance diaphragm (106) is provided between the diaphragm seat (107) and the valve gasket seat (104). The edge of the balance diaphragm (106) contacts the main regulating valve nozzle (103); 6. A gas pressure regulator tending to close according to claim 4, characterized in that, A retaining ring (111) and an O-ring (112) are provided between the diaphragm seat (107) and the valve nozzle seat (108). Both the retaining ring (111) and the O-ring (112) are sleeved on the connecting rod (105);

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