Safety valve

Abstract

The safety valve comprises a valve body, a pressure pipe and an external pressure supply device, the valve body is provided with a pressure supply opening, a pressure inlet and a pressure relief opening, the external pressure supply device is connected with a pressure cavity in the pressure supply opening through the pressure pipe, a piston is arranged in the pressure cavity in a sealed mode, and when the piston blocks the pressure inlet cavity in the pressure inlet from the interior of the valve body, the pressure relief opening is opened. A pressure inlet cavity in the pressure inlet and a pressure relief cavity in the pressure relief opening are blocked, and when the piston opens the pressure inlet cavity from the interior of the valve body, the pressure inlet cavity is communicated with the pressure relief cavity. According to the safety valve, the pressure source is externally arranged, miniaturization of the whole safety valve is achieved, the height and the size of the safety valve are greatly reduced, and the safety valve can be used for the working condition with a narrow space and is light in weight and convenient to move, disassemble and assemble.

Description

Technical Field

[0001] The utility model relates to the technical field of safety valves, and particularly relates to a safety valve. Background Art

[0002] In the existing safety valve, a large-weight piston or a spring is relied on to realize the reset of the piston. The former is not easy to move due to its large weight, so the spring safety valve is more common. However, the length of the spring is long, resulting in too large a height of the safety valve, making it impossible to install in some narrow spaces. Content of the Utility Model

[0003] An embodiment of the utility model provides a safety valve to solve the problem that in the prior art, it is impossible to install in a narrow space due to the too large height of the safety valve.

[0004] In order to achieve the above object, the embodiment of the utility model provides the following technical solutions:

[0005] A safety valve includes a valve body, a pressure pipe and an external pressure supply device. The valve body is provided with a pressure supply port, a pressure inlet and a pressure relief port. The external pressure supply device is connected to a pressure chamber in the pressure supply port through the pressure pipe. A piston is hermetically arranged in the pressure chamber. When the piston blocks the pressure inlet chamber in the valve body from the inside, the pressure inlet chamber in the pressure inlet and the pressure relief chamber in the pressure relief port are blocked. When the piston opens the pressure inlet chamber from the inside of the valve body, the pressure inlet chamber and the pressure relief chamber are communicated.

[0006] Further, the external pressure supply device includes an external pressure storage container, a three-way stop valve and a pressure gauge. The inlet and outlet of the three-way stop valve are respectively connected to the external pressure storage container and the pressure gauge. The external pressure storage container is provided with a first connection hole connected to the pressure pipe.

[0007] Further, the external pressure supply device is filled with gas or gas-liquid mixture.

[0008] Further, both ends of the pressure pipe are detachably connected to the external pressure supply device and the valve body respectively.

[0009] Further, a piston sleeve is arranged in the pressure supply port and sealed by a valve cover. The valve cover is provided with a second connection hole connected to the pressure pipe. A piston is arranged in the piston sleeve. A pressure chamber is formed among the piston sleeve, the valve cover and the piston. A valve seat for cooperating with the piston to block is arranged in the pressure inlet.

[0010] Further, a sealing member is arranged on the blocking side of the piston.

[0011] Further, a return spring is arranged in the pressure chamber.

[0012] Further, a pressure sensor is provided in the pressure chamber. The pressure sensor collects the air pressure or hydraulic pressure in the pressure chamber. If the air pressure or hydraulic pressure is abnormal, an alarm is issued.

[0013] The embodiments of the present utility model have the following advantages:

[0014] A safety valve of the present utility model includes a valve body, a pressure pipe and an external pressure supply device. The valve body is provided with a pressure supply port, a pressure inlet and a pressure relief port. The external pressure supply device is connected to the pressure chamber in the pressure supply port through the pressure pipe. A piston is hermetically arranged in the pressure chamber. When the piston blocks the pressure inlet chamber inside the valve body, the pressure inlet chamber in the pressure inlet and the pressure relief chamber in the pressure relief port are blocked. When the piston opens the pressure inlet chamber from inside the valve body, the pressure inlet chamber and the pressure relief chamber are communicated. This design externalizes the pressure source, realizes the miniaturization of the entire safety valve, greatly reduces its height and volume, enables the safety valve to be used in working conditions with narrow space, and the safety valve is relatively light in weight, facilitating movement, disassembly and assembly. Description of the Drawings

[0015] In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only exemplary. For those of ordinary skill in the art, without creative efforts, other implementation drawings can also be obtained based on the provided drawings.

[0016] The structures, ratios, sizes, etc. illustrated in this specification are only used to cooperate with the content disclosed in the specification for those who are familiar with this technology to understand and read, and are not used to limit the limited conditions under which the present utility model can be implemented. Therefore, they do not have technical essential significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects that the present utility model can produce and the purposes that can be achieved, should still fall within the scope that can be covered by the technical content disclosed in the present utility model.

[0017] Figure 1 It is a product structure diagram of a safety valve provided by an embodiment of the present utility model;

[0018] Figure 2 It is an internal structure diagram of a safety valve provided by an embodiment of the present utility model;

[0019] Figure 3 It is an internal structure diagram of a safety valve provided by another embodiment of the present utility model.

[0020] In the figure:

[0021] 1. Valve body; 2. Pressure pipe; 3. External pressure supply device; 4. Pressure supply port; 5. Inlet pressure port; 6. Pressure relief port; 7. Pressure chamber; 8. External pressure storage container; 9. Three-way stop valve; 10. Pressure gauge; 11. First connection hole; 12. Piston; 13. Pressure relief chamber; 14. Valve cover; 15. Piston sleeve; 16. Sealing member; 17. Return spring; 18. Second connection hole; 19. Valve seat. Detailed implementation mode

[0022] The following specific embodiments illustrate the implementation mode of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the scope of protection of the present invention.

[0023] As Figure 1-2 shown, a safety valve includes a valve body 1, a pressure pipe 2 and an external pressure supply device 3. The valve body 1 is provided with a pressure supply port 4, an inlet pressure port 5 and a pressure relief port 6. The external pressure supply device 3 is connected to the pressure chamber 7 in the pressure supply port 4 through the pressure pipe 2. Specifically, the external pressure supply device 3 is filled with gas or gas-liquid mixture. The external pressure supply device 3 includes an external pressure storage container 8, a three-way stop valve 9 and a pressure gauge 10. The inlet and outlet of the three-way stop valve 9 are respectively connected to the external pressure storage container 8 and the pressure gauge 10. The reversing port of the three-way stop valve 9 is connected to a gas source or a hydraulic source for filling gas or liquid into the external pressure storage container 8. The external pressure storage container 8 is provided with a first connection hole 11 connected to the pressure pipe 2. When the filling in the external pressure storage container 8 is liquid, the first connection hole 11 is arranged at the bottom of the external pressure storage container 8.

[0024] The pressure chamber 7 is hermetically provided with a piston 12. When the piston 12 blocks the inlet pressure chamber in the inlet pressure port 5 from the inside of the valve body 1, the inlet pressure chamber in the inlet pressure port 5 and the pressure relief chamber 13 in the pressure relief port 6 are blocked. When the piston 12 opens the inlet pressure chamber from the inside of the valve body 1, the inlet pressure chamber and the pressure relief chamber 13 are communicated. Specifically, a piston sleeve 15 is arranged in the pressure supply port 4 and sealed by a valve cover 14. The valve cover 14 is detachably connected to the valve body 1, which is convenient for the disassembly and assembly of structures such as the piston sleeve 15 and the piston 12. A piston 12 is arranged in the piston sleeve 15. A pressure chamber 7 is formed between the piston sleeve 15, the valve cover 14 and the piston 12. The piston 12 and the piston sleeve 15 are sealed by a plurality of oil seals. A sealing member 16 is arranged on the blocking side of the piston 12. In this embodiment, a polytetrafluoroethylene sealing member 16 is preferably used.

[0025] As Figure 3As shown, a return spring 17 is provided in the pressure chamber 7. Since there is high-pressure gas or liquid in the pressure chamber 7, this return spring 17 is different from the springs in the prior art. It is shorter than the existing springs and will not increase the height of the safety valve. Its main function is to prevent the safety valve from failing after the pressure device relieves pressure. It can be used for short-term pressure buffering and can prevent the extrusion of instantaneous large pressures.

[0026] A second connection hole 18 connected to the pressure pipe 2 is provided on the valve cover 14. A more optimal technical solution is that the two ends of the pressure pipe 2 are respectively detachably connected to the first connection hole 11 and the second connection hole 18, which facilitates the disassembly and assembly of the pressure pipe 2. Different lengths and different models of the pressure pipe 2 can be replaced according to the actual working conditions.

[0027] A valve seat 19 that cooperates with the piston 12 to block is provided in the pressure inlet 5. The valve seat 19 is embedded in the pressure inlet 5 of the valve body 1. A flange connected to the pressure source is provided at the pressure inlet 5 of the valve body 1. The valve seat 19 is used to separate the space inside the valve body 1 to form a pressure inlet chamber and a pressure relief chamber 13 respectively. The pressure relief chamber 13 is a cavity surrounding the valve seat 19 for one week. This can ensure that when the piston 12 is opened, the pressure in the pressure inlet chamber can be released to the maximum extent.

[0028] A pressure sensor is provided in the pressure chamber 7. The pressure sensor collects the air pressure or hydraulic pressure in the pressure chamber 7. If the air pressure or hydraulic pressure is abnormal, an alarm is issued. The data of the pressure sensor and the pressure gauge 10 on the external pressure storage container 8 are collected. If it is abnormal, it means that there is a pressure leakage in the external pressure storage container 8 or the pressure chamber 7, and it needs to be repaired in time, especially applicable to gas-liquid mixed pressure vessels. Moreover, the data collected by the pressure sensor is associated with the pressure data in the pipeline. By evaluating the historical pressure data in the pipeline and comparing the high-pressure situations, if the high-pressure values in the pipeline are the same, but the pressure data collected by the pressure sensor is on the low side, it means that there is a pressure leakage between the piston 12 and the valve seat 19, and the system will issue an alarm and needs to be repaired immediately.

[0029] Although the present invention has been described in detail above with general descriptions and specific embodiments, based on the present invention, some modifications or improvements can be made, which are obvious to those skilled in the art. Therefore, these modifications or improvements made without departing from the spirit of the present invention all fall within the scope of protection required by the present invention.

Claims

1. A safety valve, characterized in that: It includes a valve body, a pressure pipe and an external pressure supply device, the valve body is provided with a pressure supply port, a pressure inlet port and a pressure relief port, the external pressure supply device is connected to the pressure chamber in the pressure supply port through the pressure pipe, the pressure chamber is sealed with a piston, when the piston blocks the pressure inlet chamber in the pressure inlet port from the inside of the valve body, the pressure inlet chamber in the pressure inlet port and the pressure relief chamber in the pressure relief port are blocked, when the piston opens the pressure inlet chamber from the inside of the valve body, the pressure inlet chamber and the pressure relief chamber are connected.

2. A safety valve according to claim 1, characterized in that: The external pressure supply device includes an external pressure storage container, a three-way stop valve and a pressure gauge. The inlet and outlet of the three-way stop valve are respectively connected to the external pressure storage container and the pressure gauge. The external pressure storage container is provided with a first connecting hole connected to the pressure pipe.

3. A safety valve according to claim 1, characterized in that: The external pressure supply device is filled with gas or a gas-liquid mixture.

4. A safety valve according to claim 1, characterized in that: The two ends of the pressure pipe are detachably connected to an external pressure supply device and a valve body.

5. A safety valve according to claim 1, characterized in that: A piston sleeve is provided in the pressure supply port and is sealed by a valve cover. A second connecting hole connected to the pressure pipe is provided on the valve cover. A piston is provided in the piston sleeve. A pressure chamber is formed between the piston sleeve, the valve cover and the piston. A valve seat is provided in the pressure inlet port and is sealed with the piston.

6. A safety valve according to claim 1 or 5, characterized in that: A sealing member is provided on the blocking side of the piston.

7. A safety valve according to claim 1, characterized in that: A return spring is arranged in the pressure chamber.

8. A safety valve according to claim 1, characterized in that: A pressure sensor is provided in the pressure chamber, and the pressure sensor collects the air pressure or hydraulic pressure in the pressure chamber. If the air pressure or hydraulic pressure is abnormal, an alarm is issued.

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