Low-low pressure regulator with overpressure cut-off function

Abstract

The utility model discloses a low-low pressure regulator with an overpressure cut-off function, which belongs to the technical field of pipeline gas pipeline protection and comprises a valve body, an upper cover is arranged at the top of the valve body, and a swing arm is arranged at the bottom of the inner side of the valve body. According to the utility model, when the pressure at the rear end rises abnormally due to the fact that the front valve port of the pressure regulator is not tightly closed due to a fault, the diaphragm sleeve of the diaphragm assembly floats upwards, and when the buoyancy of the diaphragm sleeve is larger than the attraction of the pull rod, the iron sheet and the magnet, the magnet is separated from the iron sheet and falls back rapidly under the action of the valve port spring, and then the cut-off rod is driven to enable the cut-off head and the copper valve port to be closed. Therefore, damage of high-pressure gas to gas utilization equipment and personnel is effectively prevented, safety of a gas supply system is greatly improved, accident risks are reduced, life and property safety of a user is guaranteed, the pressure regulator can actively monitor pressure at the rear end, respond to abnormal conditions in time and cut off a gas source in advance, and safety of the gas supply system is improved. And a series of safety problems caused by continuous pressure rise are avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of pipeline gas pipeline protection, and in particular relates to a low-low pressure regulator with overpressure cutoff. Background Art

[0002] With the acceleration of urbanization and the improvement of people's living standards, pipeline gas, as a clean and efficient energy source, is increasingly used in residents' lives, commercial activities and industrial production. Whether it is residential communities in cities, or various commercial complexes and industrial plants, the dependence on pipeline gas is deepening, and the gas supply is increasing year by year. This makes the importance of gas pressure regulating equipment more and more prominent. Its performance and safety are directly related to the stable operation of the entire gas supply system and the safety of life and property of users.

[0003] The existing low-low pressure pre-meter pressure regulator uses the lever principle and rubber diaphragm assembly to complete the opening adjustment and closing functions of the air inlet. When the valve port is not closed tightly due to a fault, the pressure in the rear-end pipeline will gradually increase. The high-pressure gas accumulates in the rear-end pipeline, which poses a serious hidden danger to gas-using equipment and personnel. Therefore, a low-low pressure regulator with overpressure cut-off is needed to solve the above problem. Utility Model Content

[0004] The utility model aims to provide a low-low pressure regulator with overpressure cutoff to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a low-low pressure regulator with overpressure cutoff, comprising a valve body, a top cover is provided on the top of the valve body, a swing arm is provided on the inner bottom of the valve body, a cutoff assembly is provided at the inlet end of the valve body, and a membrane assembly is provided on the inner top of the valve body;

[0006] The cutting assembly comprises a cutting rod, a valve port pad, a copper valve port, a clamping screw, a cutting head and a valve port spring, wherein the clamping screw contacts the swing arm, the valve port pad is arranged opposite to the copper valve port, the cutting head is fixed to the cutting rod by the clamping screw, and the valve port spring acts on the cutting assembly to cause the cutting head to contact closely with the copper valve port;

[0007] The membrane assembly includes a membrane sleeve, a tray, an iron sheet and a pull rod, the pull rod passes through the membrane sleeve and is connected to the tray, the iron sheet is arranged at the bottom of the pull rod, a pressure regulating spring is placed on the tray, the upper end of the pressure regulating spring is in contact with the upper cover, the interior of the valve body is divided into an upper chamber and a lower chamber by the membrane sleeve, and the lower chamber of the valve body is provided with a lifting assembly;

[0008] The lifting assembly comprises a magnet and a column, wherein the magnet is connected to the column, and the column can move up and down.

[0009] As a preferred embodiment, the swing arm is in contact with the column, a pin is provided at one end of the swing arm, and the swing arm is connected to the inside of the valve body through the pin.

[0010] As a preferred implementation, the edge of the sleeve diaphragm is sealedly connected to the valve body and the upper cover.

[0011] As a preferred embodiment, the pull rod is tightly connected to the sleeve membrane and the tray.

[0012] As a preferred implementation, the valve port pad is adapted to the contour structure of the copper valve port to form a front valve port, and the cut-off head is adapted to the valve body to form a rear valve port, and the rear valve port is a streamlined valve port.

[0013] As a preferred implementation, a lifting knob is connected through the top of the upper cover, and the bottom of the lifting knob is connected with the top of the pull rod by snapping.

[0014] As a preferred implementation, the four corners of the upper cover are connected with fixing screws through threads, the number of the fixing screws is four, and the valve body is connected to the upper cover through the four fixing screws.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] The utility model discloses that when the pressure at the rear end rises abnormally due to a fault in which the front valve port of the pressure regulator is not tightly closed, the diaphragm of the diaphragm assembly floats up, and when the buoyancy on the diaphragm is greater than the suction force of the pull rod, the iron sheet and the magnet, the magnet separates from the iron sheet, and the magnet quickly falls back under the action of the valve port spring, thereby driving the cutting rod to close the cutting head and the copper valve port, completing the overpressure cutting, thereby effectively preventing the high-pressure gas from harming the gas-using equipment and personnel, greatly improving the safety of the gas supply system, reducing the risk of accidents, and ensuring the safety of users' lives and property. Compared with the traditional pressure regulator, the pressure regulator can actively monitor the rear end pressure, respond to abnormal conditions in time, cut off the gas source in advance, and avoid a series of safety problems caused by the continuous increase in pressure.

[0017] The utility model, the diaphragm component divides the internal cavity of the valve body into an upper and lower chamber, and through the coordinated action of the pull rod, tray, pressure-adjusting spring and diaphragm, it can automatically adjust the opening of the front and rear valve ports according to the changes in the inlet and outlet pressures of the pressure regulator. When there is no flow at the outlet end, the valve port pad fits with the copper valve port to close the air intake. When there is flow at the outlet end, the valve port gradually opens, and the opening can be adjusted in real time with the pressure change, so as to accurately maintain the outlet pressure stable, improve the working efficiency and service life of the equipment, and the stable pressure supply helps the gas equipment to maintain a good working state, reduce the problems of incomplete combustion and flameout caused by pressure fluctuations, and reduce It reduces the emission of harmful gases, and also reduces the wear and failure rate of equipment. By changing the shape of the voltage regulator swing arm, the longitudinal pulling force is converted into a lateral thrust, which optimizes the transmission method of the operating force. When the operator pulls the lifting twist on the top of the upper cover, only a small force is needed to drive the column and the swing arm to move through the attraction of the pull rod, iron sheet and magnet, thereby easily realizing the ventilation and pressure regulation operations of the voltage regulator. This labor-saving design improves operating efficiency and reduces the labor intensity of operators, especially when the voltage regulator needs to be operated frequently, it can better reflect its advantages, and also reduces the risk of failure caused by improper operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the cross-sectional structure of the main body of the utility model;

[0019] Figure 2 It is a schematic diagram of the three-dimensional structure of the main body of the utility model from the side;

[0020] Figure 3 A schematic diagram of the three-dimensional structure of the main body of the utility model from a top view;

[0021] Figure 4 It is a schematic diagram of the three-dimensional structure of the main body of the utility model when viewed from the front.

[0022] In the figure: 1. valve body; 2. upper cover; 3. diaphragm; 4. tray; 5. column; 6. swing arm; 7. cutting rod; 8. valve port pad; 9. copper valve port; 10. clamping screw; 11. cutting head; 12. valve port spring; 13. pull rod; 14. lifting twist; 15. iron sheet; 16. pressure regulating spring; 17. pin shaft; 18. magnet; 19. fixing screw. DETAILED DESCRIPTION

[0023] The present invention will be further described below in conjunction with the embodiments.

[0024] The following examples are used to illustrate the present invention, but cannot be used to limit the scope of protection of the present invention. The conditions in the examples can be further adjusted according to specific conditions, and simple improvements to the method of the present invention under the premise of the concept of the present invention are all within the scope of protection claimed by the present invention.

[0025] See also Figure 1-4 The utility model provides a low-low pressure regulator with overpressure cutoff, comprising a valve body 1, a top cover 2 is provided on the top of the valve body 1, a swing arm 6 is provided on the inner bottom of the valve body 1, a cutoff assembly is provided at the inlet end of the valve body 1, and a membrane assembly is provided on the inner top of the valve body 1;

[0026] The cutting assembly includes a cutting rod 7, a valve port pad 8, a copper valve port 9, a clamping screw 10, a cutting head 11 and a valve port spring 12. The clamping screw 10 contacts the swing arm 6. The valve port pad 8 is arranged opposite to the copper valve port 9. The cutting head 11 is fixed on the cutting rod 7 by the clamping screw 10. The valve port spring 12 acts on the cutting assembly to cause the cutting head 11 to contact closely with the copper valve port 9.

[0027] The membrane assembly includes a membrane sleeve 3, a tray 4, an iron sheet 15 and a pull rod 13. The pull rod 13 passes through the membrane sleeve 3 and is connected to the tray 4. The iron sheet 15 is arranged at the bottom of the pull rod 13. A pressure regulating spring 16 is placed on the tray 4. The upper end of the pressure regulating spring 16 is in contact with the upper cover 2. The interior of the valve body 1 is divided into an upper chamber and a lower chamber by the membrane sleeve 3. The lower chamber of the valve body 1 is provided with a lifting assembly.

[0028] The lifting assembly includes a magnet 18 and a column 5. The magnet 18 is connected to the column 5, and the column 5 can move up and down.

[0029] The swing arm 6 is in contact with the column 5, and a pin 17 is provided at one end of the swing arm 6. The swing arm 6 is connected to the inside of the valve body 1 through the pin 17. When the column 5 moves upward, the swing arm 6 rotates around the pin 17 and pushes the cutting rod 7 to move horizontally, so that the cutting head 11 is separated from or closed by the copper valve port 9, and the swing arm 6 converts the longitudinal movement of the column 5 into a lateral thrust on the cutting rod 7.

[0030] The edge of the sleeve diaphragm 3 is sealed with the valve body 1 and the upper cover 2. During the operation of the pressure regulator, the sleeve diaphragm 3 is deformed by the pressure difference between the upper and lower chambers, driving the iron sheet 15 and the pull rod 13 to move.

[0031] The pull rod 13 is tightly connected with the diaphragm sheet 3 and the tray 4. When the pull and twist 14 is pulled, the pull rod 13 drives the tray 4 and the iron sheet 15 to move upward. The suction force between the iron sheet 15 and the magnet 18 causes the magnet 18 and the column 5 to move upward synchronously, thereby linking the swing arm 6 and the cutting assembly.

[0032] The valve port pad 8 is adapted to the contour structure of the copper valve port 9 to form a front valve port, and the cutting head 11 is adapted to the valve body 1 to form a rear valve port. The rear valve port is a streamlined valve port. The cooperation between the two forms an optimized airflow channel in the air inlet duct to reduce air resistance. During the pressure regulation process of the pressure regulator, the contact state of the valve port pad 8 with the copper valve port 9 changes with the pressure, thereby realizing the regulation of the air intake volume. The streamlined rear valve port can reduce airflow resistance.

[0033] A lifting knob 14 is connected through the top of the upper cover 2 , and the bottom of the lifting knob 14 is connected to the top of the pull rod 13 by snapping.

[0034] The four corners of the upper cover 2 are connected with fixing screws 19 through threads. The number of the fixing screws 19 is four, and the valve body 1 is connected to the upper cover 2 through the four fixing screws 19.

[0035] The working principle and use process of the utility model are as follows: when there is no flow at the outlet end of the pressure regulator, the pressure in the lower chamber increases, causing the diaphragm 3 to drive the tray 4 to move upward, and the pressure regulating spring 16 is compressed, and at the same time, the valve port pad 8 and the copper valve port 9 are tightly fitted to close the air intake; when there is flow at the outlet end, the pressure in the lower chamber decreases, the diaphragm 3 falls back, the valve port pad 8 is separated from the copper valve port 9, the front valve port is opened, and the openings of the front and rear valve ports are automatically adjusted according to the changes in the inlet and outlet pressures to maintain the outlet pressure stable. When the front valve port of the pressure regulator fails to close tightly, resulting in an abnormal increase in the rear end pressure, the pressure in the upper chamber of the diaphragm 3 increases, causing it to drive the tray 4 to move upward significantly. When the suction force between the iron sheet 15 and the magnet 18 cannot maintain the connection, the magnet 18 and the column 5 fall back quickly under the action of the valve port spring 12, and the swing arm 6 loses support. The cutting rod 7 drives the cutting head 11 to quickly close the copper valve port 9 under the action of the valve port spring 12 to complete the overpressure cutting.

[0036] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A low-pressure regulator with overpressure cutoff, comprising a valve body (1), characterized in that: The top of the valve body (1) is provided with an upper cover (2), the inner bottom of the valve body (1) is provided with a swing arm (6), the inlet end of the valve body (1) is provided with a cut-off assembly, and the inner top of the valve body (1) is provided with a membrane assembly; The cutting assembly comprises a cutting rod (7), a valve port pad (8), a copper valve port (9), a clamping screw (10), a cutting head (11) and a valve port spring (12); the clamping screw (10) is in contact with the swing arm (6); the valve port pad (8) is arranged opposite to the copper valve port (9); the cutting head (11) is fixed to the cutting rod (7) by the clamping screw (10); and the valve port spring (12) acts on the cutting assembly to cause the cutting head (11) to be in close contact with the copper valve port (9); The diaphragm assembly comprises a sleeve diaphragm (3), a tray (4), an iron sheet (15) and a pull rod (13); the pull rod (13) passes through the sleeve diaphragm (3) and is connected to the tray (4); the iron sheet (15) is arranged at the bottom of the pull rod (13); a pressure regulating spring (16) is placed on the tray (4); the upper end of the pressure regulating spring (16) is in contact with the upper cover (2); the interior of the valve body (1) is divided into an upper chamber and a lower chamber by the sleeve diaphragm (3); and the lower chamber of the valve body (1) is provided with a lifting assembly; The lifting assembly comprises a magnet (18) and a column (5); the magnet (18) is connected to the column (5); and the column (5) is movable up and down.

2. The low-low pressure regulator with overpressure cutoff according to claim 1, characterized in that: The swing arm (6) is in contact with the column (5); a pin shaft (17) is provided at one end of the swing arm (6); and the swing arm (6) is connected to the interior of the valve body (1) via the pin shaft (17).

3. The low-low pressure regulator with overpressure cutoff according to claim 1, characterized in that: The edge of the sleeve diaphragm (3) is sealedly connected to the valve body (1) and the upper cover (2).

4. The low-low pressure regulator with overpressure cutoff according to claim 1, characterized in that: The pull rod (13) is tightly connected to the sleeve membrane (3) and the tray (4).

5. The low-low pressure regulator with overpressure cutoff according to claim 1, characterized in that: The valve port pad (8) is matched with the contour structure of the copper valve port (9) to form a front valve port, and the cut-off head (11) is matched with the valve body (1) to form a rear valve port, and the rear valve port is a streamlined valve port.

6. The low-low pressure regulator with overpressure cutoff according to claim 1, characterized in that: A lifting knob (14) is connected through the top of the upper cover (2), and the bottom of the lifting knob (14) is connected to the top of the pull rod (13) by snapping.

7. The low-low pressure regulator with overpressure cutoff according to claim 1, characterized in that: The four corners of the upper cover (2) are connected with fixing screws (19) through threads, the number of the fixing screws (19) is four, and the valve body (1) and the upper cover (2) are connected through the four fixing screws (19).

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