Diaphragm pneumatic safety valve provided with control system

Abstract

The utility model discloses a diaphragm pneumatic safety valve equipped with a control system, and relates to the technical field of pneumatic safety valves, the diaphragm pneumatic safety valve comprises a valve body, a valve cover, a cylinder body, a piston rod, a rubber diaphragm, a thrust frame, a spring, a valve rod and a valve plate, the top of the valve body is connected with the valve cover, the top of the valve cover is connected with the cylinder body, and the piston rod is inserted in the cylinder body. According to the diaphragm pneumatic safety valve provided with the control system, in the high-pressure state, the inner cavity of the C-shaped metal sealing ring is filled with liquid, high-pressure sealing is achieved, the high-low pressure control pilot valve can cut off a pressure source of the pneumatic safety valve, wellhead equipment is protected, and the pressure of an air source entering the air source pressure inlet pipe can drive the rubber diaphragm and the thrust frame; and when the pressure of the rubber diaphragm and the thrust frame is relieved, the rubber diaphragm and the thrust frame move upwards under the driving of the spring which is deformed under pressure, so that the valve is closed.

Description

Technical Field

[0001] The utility model relates to the technical field of pneumatic safety valves, in particular to a diaphragm pneumatic safety valve equipped with a control system. Background Art

[0002] Pneumatic safety valve is a safety protection valve, mainly used in pipelines and various pressure-bearing equipment. When the working pressure of the medium exceeds the allowable pressure value, the safety valve automatically opens to discharge the medium to the outside. As the medium pressure decreases, the safety valve will close again to prevent the danger of overpressure in pipelines and equipment. Diaphragm pneumatic safety valve is one of the pneumatic safety valves. The existing pneumatic safety valves still have certain defects when used.

[0003] In the prior art, pneumatic safety valves have a wide range of applications, such as in the petroleum, chemical, pharmaceutical, food, fertilizer and other industries. They are often used to protect pressure vessels, pressure pipelines and other equipment. During the use of pneumatic safety valves, it is difficult to cut off the pressure source in a timely and effective manner, which makes it easy for wellhead equipment to be damaged. Utility Model Content

[0004] The utility model aims to provide a diaphragm pneumatic safety valve equipped with a control system to solve the problem that the pressure source of the pneumatic safety valve on the market is difficult to be cut off in time as mentioned in the above background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a diaphragm pneumatic safety valve equipped with a control system, comprising: a valve body, a valve cover, a cylinder body, a piston rod, a rubber diaphragm, a thrust frame, a spring, a valve stem and a valve plate, the top of the valve body is connected to the valve cover, the top of the valve cover is connected to the cylinder body, the piston rod is inserted into the interior of the cylinder body, a rubber diaphragm is installed inside the cylinder body, the bottom of the rubber diaphragm is connected to the thrust frame, a spring is arranged at the bottom of the thrust frame, a valve stem is arranged on the inner side of the spring, and a valve plate is arranged at the bottom end of the valve stem.

[0006] Preferably, a valve seat is installed inside the valve body, a tool groove is provided on the inner wall of the valve seat, and a sealing groove is provided on the outer side of the valve seat.

[0007] Preferably, a C-shaped metal sealing ring is installed inside the sealing groove, guide angles are designed at the inner wall corners of the valve seat and the end corners of the valve plate, and a connecting pipe is installed on the outer side of the cylinder body.

[0008] Preferably, the end of the connecting pipe is connected to a high-low pressure control pilot valve, and an electromagnetic reset switch is installed at the front of the high-low pressure control pilot valve.

[0009] Preferably, the bottom of the high-low pressure control pilot valve is connected to a wellhead pressure interface, and the outer side of the high-low pressure control pilot valve is connected to a gas source pressure inlet pipe.

[0010] Preferably, the rubber diaphragm is made of high-performance rubber, and a plug-in structure is formed between the valve plate and the valve seat.

[0011] Compared with the prior art, the beneficial effects of the utility model are as follows: the diaphragm pneumatic safety valve equipped with a control system has a C-shaped metal sealing ring between the valve seat and the valve body, the openings of the two adjacent groups of C-shaped metal sealing rings face opposite directions, the C-shaped metal sealing ring has a certain interference fit with the valve seat and the valve body during installation, and the tool groove and the guide angle can facilitate the installation of the valve plate and the valve seat in an interference fit state, under high pressure, the liquid fills the inner cavity of the C-shaped metal sealing ring, causing the C-shaped metal sealing ring to deform and realize high pressure sealing, when the actual pressure at the wellhead pressure interface is higher or lower than The setting range of the high and low pressure control pilot valve, the high and low pressure control pilot valve will cut off the pressure source of the pneumatic safety valve. Under the reasoning of the spring, the pneumatic safety valve will close quickly to protect the wellhead equipment. The pressure signal of the high and low pressure control pilot valve comes from the wellhead. The gas source pressure entering the gas source pressure inlet pipe can drive the rubber diaphragm and the thrust frame to move downward, drive the valve plate to move downward, and thus realize the opening of the valve. When the pressure of the rubber diaphragm and the thrust frame is released, the rubber diaphragm and the thrust frame move upward under the drive of the compressed and deformed spring to realize the closure of the valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the main cutaway structure of the utility model;

[0013] Figure 2 For this utility model Figure 1 A is a schematic diagram of the enlarged structure of the middle part;

[0014] Figure 3 For this utility model Figure 1 Schematic diagram of the enlarged structure of B.

[0015] In the figure: 1. valve body; 2. valve cover; 3. cylinder body; 4. piston rod; 5. rubber diaphragm; 6. thrust frame; 7. spring; 8. valve stem; 9. valve plate; 10. valve seat; 11. tool groove; 12. sealing groove; 13. C-shaped metal sealing ring; 14. guide angle; 15. connecting pipe; 16. high and low pressure control pilot valve; 17. electromagnetic reset switch; 18. wellhead pressure interface; 19. gas source pressure inlet pipe. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0017] See also Figure 1 , Figure 2 and Figure 3 It can be seen that the utility model provides a technical solution: a diaphragm pneumatic safety valve equipped with a control system, comprising: a valve body 1, a valve cover 2, a cylinder body 3, a piston rod 4, a rubber diaphragm 5, a thrust frame 6, a spring 7, a valve stem 8 and a valve plate 9, the top of the valve body 1 is connected to the valve cover 2, the top of the valve cover 2 is connected to the cylinder body 3, the piston rod 4 is inserted into the cylinder body 3, the rubber diaphragm 5 is installed inside the cylinder body 3, the bottom of the rubber diaphragm 5 is connected to the thrust frame 6, the bottom of the thrust frame 6 is provided with a spring 7, the inner side of the spring 7 is provided with a valve stem 8, the bottom end of the valve stem 8 is provided with a valve plate 9, the inside of the valve body 1 is provided with a valve seat 10, the inner wall of the valve seat 10 is provided with a tool groove 11, the outer side of the valve seat 10 is provided with a tool groove 12, and the outer side of the valve seat 10 is provided with a tool groove 13. A sealing groove 12 is provided, and a C-shaped metal sealing ring 13 is installed inside the sealing groove 12. Guide angles 14 are designed at the inner wall corners of the valve seat 10 and the end corners of the valve plate 9. A connecting pipe 15 is installed on the outside of the cylinder body 3. The end of the connecting pipe 15 is connected to a high and low pressure control pilot valve 16. An electromagnetic reset switch 17 is installed at the front of the high and low pressure control pilot valve 16. The bottom of the high and low pressure control pilot valve 16 is connected to a wellhead pressure interface 18, and the outside of the high and low pressure control pilot valve 16 is connected to an air source pressure inlet pipe 19. The material of the rubber diaphragm 5 is high-performance rubber. A plug-in structure is formed between the valve plate 9 and the valve seat 10. Two groups of tool grooves 11 are symmetrically arranged about the center of the valve seat 10.

[0018] In specific implementation, a C-shaped metal sealing ring 13 is arranged between the valve seat 10 and the valve body 1, and a C-shaped metal sealing ring 13 is installed in each sealing groove 12, the opening of the C-shaped metal sealing ring 13 near the through hole of the valve body 1 faces the through hole of the valve body 1, and the openings of the two adjacent groups of C-shaped metal sealing rings 13 face opposite directions. The C-shaped metal sealing ring 13 has a certain interference with the valve seat 10 and the valve body 1 during installation, and the two C-shaped metal sealing rings 13 open in the 180° direction, which can seal the fluid in the through hole direction of the valve body 1 and the inside of the valve body 1 in two directions, and the tool groove 11 and the guide angle 14 can facilitate the installation of the valve plate 9 and the valve seat 10 in the interference state. There are grooves on the C-shaped metal sealing ring 13. When the pressure is low, the sealing is achieved by the interference fit during installation. Under high pressure, the liquid fills the inner cavity of the C-shaped metal sealing ring 13, causing the C-shaped metal sealing ring 13 to deform and achieve high-pressure sealing. When the pressure of the high and low pressure control pilot valve 16 is set within the high and low pressure numerical range, the air source pressure of the pneumatic safety valve is supplied normally. When the actual pressure at the wellhead pressure interface 18 is higher or lower than the set range of the high and low pressure control pilot valve 16, the high and low pressure control pilot valve 16 will cut off the pressure source of the pneumatic safety valve. Under the induction of the spring 7, the pneumatic safety valve is quickly closed to protect the wellhead equipment.

[0019] See also Figure 1 , Figure 2 and Figure 3 It can be seen that the pressure signal of the high and low pressure control pilot valve 16 comes from the wellhead, and the gas source pressure entering the gas source pressure inlet pipe 19 can drive the rubber diaphragm 5 and the thrust frame 6, so that the rubber diaphragm 5 and the thrust frame 6 move downward, driving the valve plate 9 to move downward, thereby realizing the opening of the valve. When the pressure of the rubber diaphragm 5 and the thrust frame 6 is released, the rubber diaphragm 5 and the thrust frame 6 move upward under the drive of the compressed and deformed spring 7, thereby realizing the closing of the valve.

[0020] To sum up, when using the diaphragm pneumatic safety valve equipped with a control system, when the working pressure of the medium exceeds the allowable pressure value, the pneumatic safety valve automatically opens to discharge the medium to the outside. As the medium pressure decreases, the safety valve will close again. The pneumatic safety valve is a prior art and will not be described in detail here. The air source pressure entering the air source pressure inlet pipe 19 can drive the rubber diaphragm 5 and the thrust frame 6, so that the rubber diaphragm 5 and the thrust frame 6 move downward, driving the valve plate 9 to move downward, thereby realizing the opening of the valve. When the pressure of the rubber diaphragm 5 and the thrust frame 6 is relieved, the rubber diaphragm 5 and the thrust frame 6 move upward under the drive of the compressed and deformed spring 7 to realize the closure of the valve. The contents not described in detail in this description belong to the prior art known to professional and technical personnel in this field.

[0021] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art may still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A diaphragm pneumatic safety valve equipped with a control system, comprising: A valve body (1), a valve cover (2), a cylinder body (3), a piston rod (4), a rubber diaphragm (5), a thrust frame (6), a spring (7), a valve stem (8) and a valve plate (9), characterized in that: The top of the valve body (1) is connected to a valve cover (2), the top of the valve cover (2) is connected to a cylinder body (3), a piston rod (4) is inserted into the interior of the cylinder body (3), a rubber diaphragm (5) is installed inside the cylinder body (3), the bottom of the rubber diaphragm (5) is connected to a thrust frame (6), a spring (7) is arranged at the bottom of the thrust frame (6), a valve stem (8) is arranged on the inner side of the spring (7), a valve plate (9) is arranged at the bottom end of the valve stem (8), a valve seat (10) is installed inside the valve body (1), a tool groove (11) is provided on the inner wall of the valve seat (10), a sealing groove (12) is provided on the outer side of the valve seat (10), and a C-shaped metal sealing ring (13) is installed inside the sealing groove (12).

2. A diaphragm pneumatic safety valve equipped with a control system according to claim 1, characterized in that: The inner wall corner of the valve seat (10) and the end corner of the valve plate (9) are both designed with guide angles (14), and a connecting pipe (15) is installed on the outer side of the cylinder body (3).

3. A diaphragm pneumatic safety valve equipped with a control system according to claim 2, characterized in that: The end of the connecting pipe (15) is connected to a high-low pressure control pilot valve (16), and an electromagnetic reset switch (17) is installed in front of the high-low pressure control pilot valve (16).

4. A diaphragm pneumatic safety valve equipped with a control system according to claim 3, characterized in that: The bottom of the high-low pressure control pilot valve (16) is connected to a wellhead pressure interface (18), and the outside of the high-low pressure control pilot valve (16) is connected to a gas source pressure inlet pipe (19).

5. A diaphragm pneumatic safety valve equipped with a control system according to claim 1, characterized in that: The material of the rubber diaphragm (5) is high-performance rubber, and a plug-in structure is formed between the valve plate (9) and the valve seat (10).

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