CN212004440U

CN212004440U - Safety valve

Info

Publication number: CN212004440U
Application number: CN202020028702.1U
Authority: CN
Inventors: 不公告发明人
Original assignee: Beijing Xinghe Power Equipment Technology Co Ltd; Galactic Energy Beijing Space Technology Co Ltd
Current assignee: Beijing Xinghe Power Equipment Technology Co Ltd; Galactic Energy Beijing Space Technology Co Ltd
Priority date: 2020-01-08
Filing date: 2020-01-08
Publication date: 2020-11-24
Anticipated expiration: 2030-01-08

Abstract

The utility model discloses a safety valve, which comprises a valve body, a valve core, a spring seat, an adjusting screw, a locking nut, a threaded interface, a pressure relief hole and a rubber cap; the middle part of the valve body is vertical to the axes of the threaded connectors at the two ends, and a pressure relief hole is arranged on the valve body; the valve core is positioned in the middle cavity of the valve body, and the sealing surface at the bottom of the valve core is in pressing fit with the sealing seat of the valve body by virtue of a spring; the lower end of the spring is arranged in the circular groove at the upper part of the valve core, and the upper end of the spring is arranged on the shoulder at the lower end of the spring seat; the adjusting screw is cylindrical and provided with an external thread, is arranged at the internal thread part in the middle of the valve body, and is provided with a square groove at the upper end for screwing in the adjusting screw; the locking nut is connected to the adjusting screw through internal threads of the locking nut, and compresses the rubber cap tightly, so that the outer surface of the middle valve body is coated by the rubber cap, and the pressure relief hole is shielded; the technical scheme of the utility model, effectively prevented outside adverse circumstances to the influence of relief valve, made it possess dustproof and waterproof shock-absorbing function.

Description

Safety valve

Technical Field

The utility model relates to a safety valve belongs to aerospace, liquid rocket technical field for the safety protection of liquid rocket attitude control system.

Background

For more than half a century, with the continuous development of aerospace industry, mankind has achieved tremendous achievement in conquering space and developing and utilizing space resources. The development and progress of aerospace technology is largely dependent on the continued development of rocket propulsion technology. A batch of advanced liquid rocket engines are developed in the aerospace major countries of the world, and the engines form carrier rockets with various purposes, so that the launching of artificial satellites, manned aerospace, lunar landing, Mars detection, global satellite communication and television transmission are realized, and even the global Internet is established. Greatly promotes the development of human civilization and obtains immeasurable economic and social benefits.

The liquid rocket generally comprises a fairing, an instrument cabin, a stage section, an oxidant storage tank, a fuel storage tank, a pressurizing conveying system, an engine, a tail section and the like. Safety valves are required to be installed on a storage tank, a pressurization conveying system and the like to improve reliability, and pressure relief holes of the safety valves used before exist in an exposed mode, so that harmful media such as dust, rainwater and the like easily enter the valve cavity due to the fact that the external environment is severe, the sensitivity of the spring is affected, or the spring fails; meanwhile, because the pressure relief hole is exposed, sharp noise is generated due to vibration of the valve body during pressure relief.

Disclosure of Invention

The technical solution problem of the utility model is that: the problem that harmful media such as dust, rainwater and the like enter the valve cavity due to the fact that a pressure relief hole is exposed out of the conventional safety valve, so that the sensitivity of a spring is influenced or the spring fails is solved, and the safety valve with the dustproof, waterproof and shock-absorbing functions is provided;

in order to achieve the above purpose, the utility model adopts the following technical scheme:

a safety valve comprises a valve body, a valve core, a spring seat, an adjusting screw, a locking nut, a threaded interface, a pressure relief hole and a rubber cap; the valve body is T-shaped, both ends of the T-shaped are threaded interfaces, the middle part of the valve body is vertical to the axes of the threaded interfaces at both ends, and a pressure relief hole is arranged on the valve body; the valve core is positioned in the middle cavity of the valve body, and the sealing surface at the bottom of the valve core is in pressing fit with the sealing seat of the valve body by virtue of a spring; the lower end of the spring is arranged in the circular groove at the upper part of the valve core, and the upper end of the spring is arranged on the shoulder at the lower end of the spring seat; the upper end of the spring seat is hemispherical, and the hemispherical surface is embedded in the conical groove at the lower end of the adjusting screw and is in circumferential line contact with the conical concave surface; the adjusting screw is cylindrical and provided with an external thread, is arranged at the internal thread part in the middle of the valve body, and is provided with a square groove at the upper end for screwing in the adjusting screw, so that the function of adjusting the mounting height of the spring is achieved; the locking nut is connected to the adjusting screw through internal threads of the locking nut, and compresses the rubber cap tightly, so that the outer surface of the middle valve body is coated by the rubber cap, and the pressure relief hole is shielded; the rubber cap is high in elasticity, when the safety valve is used for relieving pressure, the part of the rubber cap, which shields the pressure relief hole, is separated from the outer surface of the middle valve body to form a gap under the pushing of a pressure medium, so that the pressure medium is discharged; when the pressure medium disappears after the safety valve releases the pressure, the rubber cap is restored to the original state due to the elasticity of the rubber cap;

preferably, the bottom of the locking nut is provided with a circular boss, the height of the circular boss is smaller than the wall thickness of the rubber cap, and the outer edge step of the circular boss compresses the rubber cap;

preferably, the number of the pressure relief holes can be multiple, and the pressure relief holes are uniformly distributed in the middle of the valve body.

Compared with the prior art, the utility model the advantage lie in: the utility model discloses a safety valve, lock nut is through self female connection on the adjustment screw, and compress tightly the rubber cap, it is firm to make the rubber cap installation, it is difficult not hard up, make rubber cap cladding valve body middle part surface simultaneously, and shelter from the pressure release hole, it exposes effectively to have prevented that relief valve pressure release hole from exposing, even under the very abominable condition of external environment, harmful medium such as dust and rainwater can not get into the valve pocket inside yet, it is not influenced to make inside spring, the performance of relief valve has been guaranteed, the elastic rubber cap still plays the shock attenuation noise elimination effect, the noise that produces when effectively having reduced the relief valve pressure release.

Drawings

FIG. 1 is a diagram of the structure of the embodiment of the present invention;

FIG. 2 is a sectional view of the arrangement of pressure relief holes in an embodiment of the present invention;

FIG. 3 is a front sectional view of the rubber cap according to the embodiment of the present invention;

FIG. 4 is a front sectional view of a locking nut according to an embodiment of the present invention;

fig. 5 is a top view of the locking nut of the embodiment of the present invention;

FIG. 6 is a front sectional view of an adjusting screw according to an embodiment of the present invention;

fig. 7 is a top view of an adjusting screw according to an embodiment of the present invention.

Detailed Description

The safety valve of the utility model, the structure of the specific embodiment of which is shown in the attached figure 1, comprises a valve body 1, a valve core 2, a spring 3, a spring seat 4, an adjusting screw 5, a locking nut 6, a threaded connector 7, a pressure relief hole 8 and a rubber cap 9;

wherein valve body 1 is the T type, and T type both ends are threaded connection 7, and the internal diameter is 6mm, and the screw specification is M12X1.25.

The middle part of the valve body is vertical to the axes of the threaded connectors at the two ends, the middle part is provided with 4 pressure relief holes which are uniformly distributed along the circumference of the middle valve body, and the pressure relief holes are shown in attached figures 1 and 2;

the valve core 2 is positioned in the middle cavity of the valve body, the bottom sealing surface of the valve core 2 is in press fit with the sealing seat of the valve body 1 by the spring 3, and the diameter of the sealing seat is 4 mm. The lower end of the spring 3 is arranged in a circular groove at the upper part of the valve core 2, and the upper end of the spring is arranged on a shoulder at the lower end of the spring seat 4; the upper end of the spring seat 4 is hemispherical, and the hemispherical surface is embedded in the conical groove at the lower end of the adjusting screw 5 and is in circumferential line contact with the conical concave surface; the adjusting screw 5 is cylindrical and provided with an external thread, is matched with the internal thread in the middle of the valve body, and has the thread specification of M14X1.5;

the upper end of the adjusting screw 5 is provided with a square groove, so that the adjusting screw 5 can be conveniently operated to screw in the depth of the thread, the installation load of the spring 3 is controlled, and when the installation load of the spring 3 corresponds to the set critical pressure range of the safety valve, the safety valve starts to work;

the locking nut 6 is fastened on the adjusting screw 5 through the internal thread of the locking nut, a round boss is arranged at the bottom of the locking nut 6, and the height of the boss is

The wall thickness of the rubber cap 9 is

Figure DEST_PATH_226524DEST_PATH_IMAGE002

The height of the boss is smaller than the wall thickness of the rubber cap 9, the rubber cap 9 can be tightly pressed by the steps at the outer edge of the boss, the rubber cap is firmly installed and is not easy to loosen, the rubber cap 9 covers the outer surface of the middle part of the valve body and covers the pressure relief hole 8, and the internal thread of the locking nut is M14X 15;

the working principle is as follows: when the safety valve is used for relieving pressure, under the pushing of a pressure medium, the part of the rubber cap 9, which shields the pressure relief hole 8, is separated from the outer surface of the middle part of the valve body to form a gap, so that the pressure medium is discharged, and the rubber cap 9 has good elasticity and is coated, so that the damping effect is achieved, and the pressure relief noise is greatly reduced; when the pressure medium disappears after the safety valve releases the pressure, the rubber cap 9 is restored to the original state due to the elasticity of the rubber cap;

the above description is only a specific embodiment of the present invention, but the protection of the present invention is not limited thereto, and those skilled in the art can make any modifications without substantial changes without changing the principle, and should be regarded as the protection scope of the present invention;

details not described in the present specification belong to the prior art known to those skilled in the art.

Claims

1. A safety valve comprises a valve body (1), a valve core (2), a spring (3), a spring seat (4), an adjusting screw (5), a locking nut (6), a threaded connector (7), a pressure relief hole (8) and a rubber cap (9); the pressure relief valve is characterized in that the valve body (1) is T-shaped, the two ends of the T-shaped valve body are provided with threaded connectors (7), the middle part of the valve body (1) is perpendicular to the axes of the threaded connectors at the two ends, and the middle part of the valve body (1) is provided with a pressure relief hole (8); the valve core (2) is positioned in a middle cavity of the valve body (1), and a bottom sealing surface of the valve core (2) is in press fit with a sealing seat of the valve body (1) by virtue of the spring (3); the lower end of the spring (3) is arranged in a circular groove at the upper part of the valve core (2), and the upper end of the spring is arranged on a shoulder at the lower end of the spring seat (4); the upper end of the spring seat (4) is hemispherical, and the hemispherical surface is embedded in the conical groove at the lower end of the adjusting screw (5) and is in circumferential line contact with the conical concave surface; the adjusting screw (5) is cylindrical and provided with an external thread, is arranged at the internal thread part in the middle of the valve body (1), and is provided with a square groove at the upper end for screwing the adjusting screw (5) into the position; the locking nut (6) is connected to the adjusting screw (5) through an internal thread of the locking nut, and compresses the rubber cap (9), so that the rubber cap (9) coats the outer surface of the middle part of the valve body (1) and shields the pressure relief hole (8).

2. A safety valve according to claim 1, characterized in that the bottom of the locking nut (6) is provided with a circular boss, the height of the circular boss is smaller than the wall thickness of the rubber cap (9), and the outer edge step of the circular boss compresses the rubber cap (9).

3. A safety valve according to claim 1, characterized in that the number of said relief holes is several and is uniformly distributed in the middle of said valve body (1).