Quick-opening pressure release valve

Abstract

The utility model relates to the technical field of pressure release valves, and discloses a quick-opening pressure release valve, which solves the problems in the background technology, and comprises an upper valve body and a lower valve body, a valve seat is arranged between the upper valve body and the lower valve body, a driving oil cylinder is arranged at the top of the upper valve body, the driving oil cylinder comprises a rodless cavity and a rod cavity, and the rodless cavity is communicated with the rod cavity. A base is arranged at the bottom of the lower valve body, a valve rod is arranged in the upper valve body and the lower valve body, the valve rod is of an up-down through shaft type structure, the uppermost end of the valve rod is directly connected with the telescopic end of a driving oil cylinder, a guide piston is arranged on the upper portion of the valve rod, and the lower portion of the valve rod is installed in a stroke guide cylinder in the middle of the base. According to the pressure relief valve, due to the fact that the valve clack is arranged on the downstream side of the valve seat, when the pressure of a medium in a pipeline exceeds the designed pressure, the pressure of the medium can always push the valve clack downwards to be away from the valve seat, the opening and closing force is small, and rapid pressure relief is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of pressure relief valves, in particular to a quick-opening pressure relief valve. Background Art

[0002] As a common device for the safe operation of pipelines, pressure relief valves should be able to quickly open the valve to relieve pressure when the pressure in the pipeline exceeds the set pressure. They play a vital role in the safe operation of pipelines. With the development of industry, the pressure level and safety requirements of pipelines are becoming higher and higher. As indispensable equipment for pipelines, pressure regulating and pressure relief valves have also increased their structural requirements and response speed.

[0003] The current pressure relief valve is designed with the valve disc on the upstream side of the valve seat. When the valve needs to be opened, the tension of the rodless chamber of the driving cylinder overcomes the pressure of the medium pushing the valve disc toward the valve seat to open the valve. Therefore, the valve opening force is relatively large; and when the valve needs to be closed, the thrust of the rod chamber of the driving cylinder plus the pressure of the medium pushing the valve disc toward the valve seat are used to close the valve, and the valve closing force is relatively small. This causes an unreasonable situation when the valve is configured with the driving cylinder, that is, when the valve opening force is large, the force is output through the rodless chamber, and when the valve closing force is small, the force is output through the rodless chamber. Therefore, the valve opening force is large, and the response speed of the valve opening and closing is slow. For this reason, we have proposed a quick-opening pressure relief valve. Utility Model Content

[0004] In order to solve the problem that the current pressure relief valve has a small valve closing force and a large valve opening force, so that the response speed of the valve opening and closing is slow, the utility model provides the following technical solutions: a quick-opening pressure relief valve, comprising an upper valve body and a lower valve body, a valve seat is arranged between the upper valve body and the lower valve body, a driving oil cylinder is installed on the top of the upper valve body, the driving oil cylinder includes a rodless chamber and a rod chamber, a base is provided at the bottom of the lower valve body, and valve stems are arranged in the upper valve body and the lower valve body, the valve stem adopts an upper and lower through-axis structure, the upper end of the valve stem is directly connected to the telescopic end of the driving oil cylinder, a guide piston is provided on the upper part of the valve stem, and the lower part is installed in the travel guide cylinder in the middle of the base, a valve disc is installed on the downstream side of the valve seat, and the valve disc is arranged at the lower part of the valve stem.

[0005] Preferably, the upper valve body is an angular needle-shaped structure and is provided with an observation hole, and an observation hole cover is provided on the observation hole.

[0006] Preferably, the lower valve body is a hemispherical structure, which has better pressure-bearing capacity and the structure in which the flow surface suddenly increases behind the sealing pair can better achieve the effect of reducing pressure. The lower valve body and the valve seat are positioned by pins and fixed with screws, which is convenient for disassembly, inspection and replacement after long-term corrosion and wear.

[0007] Preferably, a flow hole is provided on the guide piston, the outer circle is brazed, and a copper-based self-lubricating bearing is used inside the travel guide cylinder to ensure that the valve stem can only move linearly up and down when the valve is opened and closed.

[0008] Preferably, a fixed cone is provided at the center of the base, and a guide vane is connected between the fixed cone and the base. The guide vane is a swirl blade-type rib plate structure, which can ballast the high-speed irregular water flow ejected from the valve outlet, change the flow state, and dissipate energy in the process through the fixed cone.

[0009] Preferably, the side of the lower valve body has an outlet, and the outlet side is provided with an air valve assembly for automatic air intake and replenishment, which can prevent negative pressure from being generated on the outlet side.

[0010] Compared with the prior art, the beneficial effects of the present invention are:

[0011] By designing the valve disc on the downstream side of the valve seat, when the medium in the pipeline exceeds the design pressure, the medium pressure can always push the valve disc downward away from the valve seat, resulting in a smaller opening and closing force. Therefore, when the valve is opened, the thrust is generated by driving the oil cylinder, which acts together with the thrust of the medium in the pipeline to maximize the thrust at the moment of opening. The valve disc is pushed downward away from the valve seat through the valve stem, so that the valve opens quickly to relieve pressure in the pipeline, thereby protecting the safe operation of the pipeline. When the valve is closed, the pressure between the upper valve body and the lower valve body is equal and is the normal operating pressure, and the valve closing force is small. The valve disc is lifted to the valve seat through the valve stem by driving the oil cylinder to contract to achieve the sealing pressure ratio. The driving cylinder thrust and the medium thrust act together to open the valve, thereby achieving the effect of rapid pressure relief. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0013] Figure 1 This is a schematic diagram of the front cross-sectional structure of the entire utility model;

[0014] In the figure: 1. Drive cylinder; 2. Valve stem; 3. Guide piston; 4. Upper valve body; 5. Lower valve body; 6. Base; 7. Inspection hole cover; 8. Valve disc; 9. Valve seat; 10. Air valve assembly; 11. Travel guide cylinder; 12. Fixed cone; 13. Guide vane. DETAILED DESCRIPTION

[0015] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0016] Depend on Figure 1 It is given that the utility model includes an upper valve body 4 and a lower valve body 5, a valve seat 9 is arranged between the upper valve body 4 and the lower valve body 5, a driving cylinder 1 is installed on the top of the upper valve body 4, the driving cylinder 1 includes a rodless cavity 101 and a rod cavity 102, a base 6 is provided at the bottom of the lower valve body 5, a valve stem 2 is arranged in the upper valve body 4 and the lower valve body 5, the valve stem 2 adopts an upper and lower through-axis structure, the upper end of the valve stem 2 is directly connected to the telescopic end of the driving cylinder 1, a guide piston 3 is provided on the upper part of the valve stem 2, and the lower part is installed in the travel guide cylinder 11 in the middle of the base 6, a valve flap 8 is installed on the downstream side of the valve seat 9, and the valve flap 8 is arranged at the lower part of the valve stem 2.

[0017] The upper valve body 4 is an angular needle-shaped structure and is provided with an observation hole, on which an observation hole cover 7 is provided.

[0018] The lower valve body 5 is a hemispherical structure. The hemispherical structure has better pressure bearing capacity and the structure with a sudden increase in the flow surface behind the sealing pair can better achieve the effect of reducing pressure. The lower valve body 5 and the valve seat 9 are positioned by pins and fixed with screws, which is convenient for disassembly, maintenance and replacement after long-term corrosion and wear.

[0019] A flow hole is set on the guide piston 3, and the outer circle is brazed. The interior of the travel guide cylinder 11 adopts a copper-based self-lubricating bearing to ensure that the valve stem 2 can only move up and down linearly when the valve is opened and closed.

[0020] A fixed cone 12 is provided at the center of the base 6, and a guide vane 13 is connected between the fixed cone 12 and the base 6. The guide vane 13 is a swirl blade-type rib plate structure. The fixed cone 12 can ballast the high-speed irregular water flow ejected from the valve outlet, change the flow state, and dissipate energy in the process.

[0021] An outlet is provided on the side of the lower valve body 5 , and an air valve assembly 10 is provided on the outlet side for automatically supplying air, which can prevent negative pressure from being generated on the outlet side.

[0022] Working principle: By designing the valve disc 8 on the downstream side of the valve seat 9, when the medium in the pipeline exceeds the design pressure, the medium pressure can always push the valve disc 8 downward away from the valve seat 9, resulting in a smaller opening and closing force. Therefore, when the valve is opened, the thrust is generated by driving the oil cylinder 1, which acts together with the thrust of the medium in the pipeline to maximize the thrust at the moment of opening. The valve disc 8 is pushed downward away from the valve seat 9 through the valve stem 2, so that the valve is quickly opened to relieve pressure on the pipeline, thereby protecting the safe operation of the pipeline. When the valve is closed, the pressure between the upper valve body 4 and the lower valve body 5 is equal and is the normal operating pressure, and the valve closing force is small. By driving the oil cylinder 1 to contract, the valve disc 8 is driven to rise to the valve seat 9 through the valve stem 2 to achieve the sealing pressure ratio. The thrust of the driving oil cylinder 1 and the medium thrust act together to open the valve, thereby achieving the effect of rapid pressure relief.

[0023] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0024] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A quick-opening pressure relief valve, characterized in that: The invention comprises an upper valve body (4) and a lower valve body (5), wherein a valve seat (9) is arranged between the upper valve body (4) and the lower valve body (5), a driving cylinder (1) is installed on the top of the upper valve body (4), and the driving cylinder (1) comprises a rodless chamber (101) and a rod chamber (102), a base (6) is arranged on the bottom of the lower valve body (5), and a valve stem (2) is arranged inside the upper valve body (4) and the lower valve body (5), and the valve stem (2) adopts an upper and lower through-axis structure, and the uppermost end of the valve stem (2) is directly connected to the telescopic end of the driving cylinder (1), a guide piston (3) is arranged on the upper part of the valve stem (2), and the lower part is installed in a travel guide cylinder (11) in the middle of the base (6), and a valve flap (8) is installed on the downstream side of the valve seat (9), and the valve flap (8) is arranged at the lower part of the valve stem (2).

2. A quick-opening pressure relief valve according to claim 1, characterized in that: The upper valve body (4) is an angular needle-shaped structure and is provided with an observation hole, on which an observation hole cover (7) is provided.

3. A quick-opening pressure relief valve according to claim 2, characterized in that: The lower valve body (5) is a hemispherical structure, and the lower valve body (5) and the valve seat (9) are positioned by pins and fixed by screws.

4. A quick-opening pressure relief valve according to claim 3, characterized in that: The guide piston (3) is provided with a flow hole, the outer circle is brazed, and the interior of the travel guide cylinder (11) adopts a copper-based self-lubricating bearing to ensure that the valve stem (2) can only move up and down in a straight line when the valve is opened and closed.

5. A quick-opening pressure relief valve according to claim 4, characterized in that: A fixed cone (12) is arranged at the center of the base (6), a guide vane (13) is connected between the fixed cone (12) and the base (6), and the guide vane (13) is a swirl vane-type rib plate structure.

6. A quick-opening pressure relief valve according to claim 5, characterized in that: The side of the lower valve body (5) is provided with an outlet, and the outlet side is provided with an air valve assembly (10) for automatically supplying air.

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