A pressure reducer small piston with double sealing rings and ball head and a large piston matched therewith

Abstract

The present application relates to pressure reducer accessory technical field, specifically a kind of small piston of pressure reducer with double sealing ring and ball head and the big piston matched with it, the small piston cylindrical surface is equipped with at least two sealing ring grooves, the sealing ring groove is equipped with sealing ring, and the small piston end is spherical, its advantages are that: double sealing ring on small piston can keep small piston shaft and big piston shaft coincide, sealing line is always on a tangent when pressure reducer is closed, and good sealing is kept.The maximum flux can be kept when pressure reducer is opened, and the streamline surface of ball head makes that air flow is smooth and flow is larger.Thereby, pressure reducer has good performance and stability, and breathing is more comfortable.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pressure reducer accessories, in particular to a pressure reducer small piston with double sealing rings and a ball head and a large piston matched with the small piston. BACKGROUND

[0002] The pressure reducer is widely used in the output end of various high-pressure containers to reduce the pressure of high-pressure gas in the high-pressure container, so that the high-pressure gas is output for use after being reduced to medium or low pressure by the pressure reducer. Therefore, the pressure reduction performance and stability of the pressure reducer are particularly important. The core of the existing air respirator pressure reducer is a small piston and a large piston. The small piston is provided with a single sealing ring and a conical inclined surface sealing head. When the single sealing ring small piston slides in the small piston hole of the large piston, the fulcrum of the small piston is only one, which is easy to swing. When the small piston is closed, the sealing surface of the small piston head cannot be tangent to the sealing circular corner of the large piston at one position, forming multiple tangent lines, which leads to poor sealing and causes high-pressure leakage. When the small piston is opened, the sharp corner of the small piston head of the conical inclined surface sealing head blocks part of the opening, so that the flux formed by the opening is smaller than that at the tangent position, the opening is reduced, and the airflow is blocked. At the same time, the sharp corner of the end surface of the small piston of the conical inclined surface sealing head cannot form a streamline curved surface on the airflow surface, which blocks the airflow. In particular, in the air respirator pressure reducer, the poor sealing and poor airflow of the existing single sealing ring and conical inclined surface sealing head small piston are particularly prominent, which reduces the performance and stability of the pressure reducer, thereby affecting the comfort of breathing. SUMMARY

[0003] The present application aims to solve the problems of the prior art and provide a pressure reducer small piston with double sealing rings and a ball head and a large piston matched with the small piston.

[0004] In order to achieve the above-mentioned purpose, a pressure reducer small piston with double sealing rings and a ball head is designed, which is characterized in that at least two sealing ring grooves are arranged on the cylindrical surface of the small piston, sealing rings are arranged in the sealing ring grooves, and the end of the small piston is in a spherical shape.

[0005] A large piston matched with the small piston is also disclosed, which is characterized in that a through channel is arranged in the middle of the large piston, the small piston is arranged in the channel of the large piston, and the small piston can block the channel of the large piston.

[0006] Preferably, the axis of the large piston coincides with the axis of the small piston.

[0007] Compared with the prior art, the advantages of the present application are that the double sealing rings on the small piston can keep the axis of the small piston coinciding with the axis of the large piston, the sealing line of the pressure reducer is always on a tangent line to maintain good sealing when the pressure reducer is closed. When the pressure reducer is opened, the maximum flux can be maintained, and the streamline curved surface of the ball head makes the airflow smooth and the flow larger. Therefore, the pressure reducer has good performance and stability, and the breathing is more comfortable. BRIEF DESCRIPTION OF DRAWINGS

[0008] Figure 1 is the small piston profile view according to the present application;

[0009] Figure 2 is the large piston profile view according to the present application;

[0010] Figure 3 is the small piston closing state view according to the present application;

[0011] Figure 4 is the small piston opening state view according to the present application;

[0012] In the figure: 1. small piston 2. large piston 3. sealing ring 4. large piston sealing round corner 5. small piston hole on large piston 6. tangent line of small piston head sealing surface and large piston sealing round corner. DETAILED DESCRIPTION

[0013] The present application will be further described below in conjunction with the drawings, and the structure and principle of the present application are very clear to the person skilled in the art. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.

[0014] Referring to Figure 1 , the present application designs a pressure reducer small piston with double sealing rings and a ball head, two sealing ring grooves are designed on the cylindrical surface of the pressure reducer small piston and two sealing rings are installed, and the sealing head of the pressure reducer small piston is designed in a spherical shape.

[0015] Referring to Figure 2 , the present application also designs a large piston matched with the above-mentioned small piston, a through channel is arranged in the middle of the large piston, the small piston is arranged in the channel of the large piston, and the channel of the large piston can be blocked by the small piston.

[0016] Referring to Figure 3 and Figure 4 , the small piston with two sealing rings is installed in the channel of the large piston, when the small piston slides in the channel of the large piston, the two sealing rings become two fulcrums, the axis of the small piston coincides with the axis of the large piston, and the small piston does not swing. When the small piston is closed, the tangent line of the spherical head sealing surface of the small piston and the sealing round corner of the large piston is always a line, thereby maintaining good sealing on the line; at the same time, the spherical arc surface of the small piston head separates from the tangent line when the small piston is opened, the distance between the tangent line is always the smallest, the tangent line on both sides is a smooth arc streamline curved surface, the air flow passes according to the actual opening distance, the maximum flow is maintained when opening, and the smooth arc streamline curved surface does not hinder the air flow, so that the air flow is smoother and the flow is larger.

[0017] In summary, the small piston of the application can keep the small piston shaft coinciding with the large piston shaft when cooperating with the large piston, and the sealing line can keep good sealing on a tangent when the small piston is closed. When the small piston is opened, the maximum flux can be kept, and the streamlined surface of the ball head makes the airflow smooth and the flow larger. Thus, the pressure reducer has good performance and stability, and the breathing is more comfortable.

Claims

1. A large piston matched with a small piston of a pressure reducer with double sealing rings and a ball head, characterized in that: at least two sealing ring grooves are arranged on the cylindrical surface of the small piston, and sealing rings are arranged in the sealing ring grooves; the end of the small piston is in a spherical shape; a through channel is arranged in the middle of the large piston, the small piston is arranged in the channel of the large piston and can block the channel of the large piston, the inner side surface of the large piston matched with the small piston is in a rounded structure, and the outer side surface of the head of the small piston matched with the large piston is in a spherical arc surface; when the small piston is closed, the tangent line of the sealing surface of the ball head of the small piston and the sealing rounded corner of the large piston is a line, and good sealing is maintained on the line; when the small piston is opened, the spherical arc surface of the head of the small piston and the sealing rounded corner of the large piston are separated from the tangent line, the distance between the tangent line is kept to be minimum, the tangent line on both sides is in a smooth arc streamline curved surface, the air flow passes according to the actual opening distance, and the smooth arc streamline curved surface does not hinder the air flow. The shaft of the large piston coincides with the shaft of the small piston. ​ ​ ​ 2. The large piston of claim 1, wherein: ​

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