CN110185825B

CN110185825B - Double safety valve

Info

Publication number: CN110185825B
Application number: CN201910456322.XA
Authority: CN
Inventors: 振前; 刘伟; 张启明; 张耀新; 张聪超; 张红涛; 吴盈志; 李萌; 周俊涛; 王敏
Original assignee: Henan Aerospace Hydraulic and Pneumatic Technology Co Ltd
Current assignee: Henan Aerospace Hydraulic and Pneumatic Technology Co Ltd
Priority date: 2019-05-29
Filing date: 2019-05-29
Publication date: 2021-05-07
Anticipated expiration: 2039-05-29
Also published as: CN110185825A

Abstract

The invention provides a double safety valve, which comprises a valve body, wherein an inlet flange and an outlet flange are arranged on the valve body, the inlet flange is connected with an inlet joint, the outlet flange is connected with an outlet joint, and the inlet joint is connected with the outlet joint through at least two groups of valve bodies which are arranged in parallel; the valve body is internally provided with a rotary sleeve, the rotary sleeve is internally provided with a groove, the groove is internally and movably provided with a valve, the valve is matched with the rotary sleeve through a spring, and the valve is internally provided with a vertical guide rod, and the vertical guide rod is matched with the valve. The invention has compact integral structure design, light weight, high reliability, convenient and quick replacement and maintenance, and can replace a failed valve body only when one valve body fails, thereby being convenient to disassemble and saving the cost.

Description

Double safety valve

Technical Field

The invention relates to the technical field of low-pressure safety valves, in particular to a double-safety valve.

Background

The safety valve is one of the most widely used safety devices in pressure vessels and pressure piping systems to prevent the pressure from exceeding the allowable limit value and ensure the safe operation of the system. The method is widely applied to various industries of industrial production, and plays an important role in the safe and reliable operation of equipment systems.

The safety valve belongs to a key part of a system, and the operation experience of the safety valve shows that various faults can occur in the use process of the safety valve, and a redundancy design method can be adopted to improve the reliability of the safety valve. The scheme of effectively improving the reliability is that double safety valves connected in parallel are adopted. While the existing double relief valves are basically installed in one valve body, the double relief valve with application number 99807235.4 needs to be disassembled if one of the two relief valves needs to be repaired or replaced. Also, the double relief valves are connected only by piping, such as the double relief valve of application No. 201510573899.0, which is bulky and unsuitable for installation in systems where space size requirements are critical.

With the continuous development of the aviation and aerospace technology in China, the performances of various aircrafts and spacecrafts are increasingly improved, and the sizes of matched products are more and more strict, so that the development of a double safety valve which is based on redundancy design consideration, compact in structure, light in weight and up to standard in performance is of great significance.

Disclosure of Invention

The invention provides a double safety valve, aiming at the technical problems that the whole safety valve needs to be disassembled when the traditional safety valve is overhauled or replaced, and the existing double safety valve is complex in structure and large in size.

In order to solve the above problems, the technical solution of the present invention is realized as follows:

a double safety valve comprises a valve body, wherein an inlet flange and an outlet flange are arranged on the valve body, the inlet flange is connected with an inlet joint, the outlet flange is connected with an outlet joint, the inlet joint is connected with an outlet joint through at least two groups of valve bodies arranged in parallel, and the outlet joint is communicated with a pressure pipeline; the valve body is internally provided with a rotary sleeve, the rotary sleeve is internally provided with a groove, the groove is internally and movably provided with a valve, the valve is matched with the rotary sleeve through a spring, and the valve is internally provided with a vertical guide rod, and the vertical guide rod is matched with the valve.

Preferably, two small holes are formed in the rotary sleeve and matched with the rotary sleeve.

Preferably, the upper part of the valve is provided with a valve spring guide surface which is guided to the inner diameter surface of the spring; the lower part of the rotary sleeve is provided with a rotary sleeve spring guide surface and a rotary sleeve spring guide surface which guides the outer diameter surface of the spring.

Preferably, the inlet joint and the outlet joint are both provided with connecting flanges, and the connecting flanges are connected with the inlet flange or the outlet flange; the connecting flange is provided with an O-shaped circular groove, and an O-shaped sealing ring is arranged in the O-shaped circular groove.

Compared with the prior art, the invention has the beneficial effects that:

1. by adopting the structural form of the double safety valves which are arranged in parallel, the overall reliability of the safety valves can be improved.

2. The internal-discharging safety valve is characterized in that the outlet connector is communicated with a pipeline with certain pressure, and under the action of the pressure pipeline, the influence of back pressure on the opening of the valve can be not considered, so that the effect on the low-pressure safety valve is particularly obvious. The internal exhaust action type safety valve can also prevent harmful gas from leaking outwards and prevent environmental pollution.

3. The relief valve passes through flange joint, can realize swiftly changing the maintenance, even a relief valve breaks down, only needs to replace the relief valve module, and need not change whole relief valve system, saves the cost.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is a schematic structural view of the valve body in fig. 1.

In the figure, 1 is a rotary sleeve, 2 is a spring, 3 is a valve body, 4 is an inlet flange, 5 is an outlet flange, 6 is a valve, 7 is a connecting flange, 8 is an outlet joint, and 9 is an inlet joint.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.

As shown in fig. 1 and 2, a dual safety valve comprises a valve body 3, wherein an inlet flange 4 and an outlet flange 5 are arranged on the valve body 3, the inlet flange 4 is connected with an inlet joint 9, the outlet flange 5 is connected with an outlet joint 8, connecting flanges 7 are arranged on the inlet joint 9 and the outlet joint 8, and the connecting flanges 7 are connected with the inlet flange 4 or the outlet flange 5; an O-shaped circular groove is formed in the connecting flange 7, an O-shaped sealing ring is arranged in the O-shaped circular groove, and before the valve body is installed, the O-shaped sealing ring is placed in the O-shaped circular groove and coated with a layer of aviation lubricating grease.

The valve body 3 is internally provided with a rotary sleeve 1, the rotary sleeve 1 is internally provided with a groove, a valve 6 is movably arranged in the groove, the valve moves in the groove after being subjected to air pressure change at an inlet, the valve 6 is matched with the rotary sleeve 1 through a spring 2, the upper part of the valve 6 is provided with a valve spring guide surface, and the valve spring guide surface is guided to the inner diameter surface of a spring, namely the inner diameter surface of an upper outer circular surface of the valve; the lower portion of the rotating sleeve 1 is provided with a rotating sleeve spring guide surface and a rotating sleeve spring guide surface guide spring outer diameter surface, the spring sleeve is arranged in the rotating sleeve, the valve penetrates through the spring to move in a groove of the rotating sleeve, spring action is facilitated by the aid of the valve spring guide surface and the rotating sleeve spring guide surface, friction force between the spring and the rotating sleeve and between the spring and the valve is reduced, a vertical guide rod and a vertical guide rod are arranged in the valve 6 and matched with the valve 6, the vertical guide rod enables the valve to keep moving in the vertical direction in the groove in the moving mode, and vibration is avoided.

The spiral sleeve 1 is further provided with two small holes, the two small holes are matched with the spiral sleeve, the jackscrew in the two small holes is jacked into the spiral sleeve to adjust the height of the spiral sleeve, when the spiral sleeve is in actual use, due to the influence of errors of spring processing and the like, the height needs to be adjusted to adjust the proper spring prestress so as to ensure that the valve can be normally opened when the opening pressure is applied, after the spiral sleeve is adjusted to be proper, a small hole is transversely drilled and tapped on the spiral sleeve and the spiral sleeve, and the jackscrew is internally screwed into the spiral sleeve and is filled with glue for sealing.

The inlet joint 9 is connected with the outlet joint 8 through at least two groups of valve bodies 3 arranged in parallel, the outlet joint 8 is communicated with a pressure pipeline, certain pressure is provided for the outlet of the valve body through a pipeline with pressure, the outlet joint is connected with the valve body in a communication connection mode, thus the inlet joint and the outlet joint form a sealed safety valve system with the valve body respectively, gas cannot escape into the external environment, the gas pressure of the external environment cannot influence the opening of an internal valve, after the gas enters the valve body of the valve, when the inlet pressure is lower, the gas is not greater than the opening pressure, the valve is not enough to overcome downward back pressure, downward spring force and downward valve dead weight by upward gas pressure, and the valve is tightly attached to a valve seat of the valve body. When the gas pressure rises gradually, the valve can overcome downward back pressure, downward spring force and downward valve dead weight by the upward gas pressure, the valve is opened, the spring is compressed, the spring force is increased, and the opening degree of the valve cannot be overlarge. When the gas pressure is released to a certain degree, the pressure is reduced, and the valve is closed;

the above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. A double safety valve comprises a valve body (3), wherein an inlet flange (4) and an outlet flange (5) are arranged on the valve body (3), and the double safety valve is characterized in that the inlet flange (4) is connected with an inlet joint (9), the outlet flange (5) is connected with an outlet joint (8), the inlet joint (9) is correspondingly connected with the outlet joint (8) through at least two groups of parallel valve bodies (3), and the outlet joint (8) is communicated with a pressure pipeline; be equipped with in valve body (3) and revolve cover (1), be equipped with a recess in revolving cover (1), the recess internalization is equipped with a valve (6) and cooperatees with revolving cover (1) through spring (2), and the upper portion of valve (6) is equipped with valve spring spigot surface and valve spring spigot surface direction spring inside diameter face, revolves cover (1) lower part and is equipped with and revolves cover spring spigot surface and revolve cover spring spigot surface direction spring outside diameter face, is equipped with a vertical guide bar and vertical guide bar in valve (6) and cooperatees with valve (6).

2. The double safety valve according to claim 1, wherein the rotary sleeve (1) is further provided with two small holes, and the two small holes are matched with the rotary sleeve (1).

3. The double safety valve according to claim 1, characterized in that the inlet connection (9) and the outlet connection (8) are each provided with a connecting flange (7), the connecting flange (7) being connected to the inlet flange (4) or the outlet flange (5); and an O-shaped circular groove is formed in the connecting flange (7), and an O-shaped sealing ring is arranged in the O-shaped circular groove.