CN2326492Y

CN2326492Y - Rubber diaphragm-board of air distribution valve of braking machine

Info

Publication number: CN2326492Y
Application number: CN 97202502
Authority: CN
Inventors: 郑华; 陈国生; 卞慕敦
Original assignee: Metals And Chemistry Inst Of Ministry Of Railways
Current assignee: Metals And Chemistry Inst Of Ministry Of Railways
Priority date: 1997-03-25
Filing date: 1997-03-25
Publication date: 1999-06-30
Anticipated expiration: 2007-03-25

Abstract

The utility model relates to a novel rubber diaphragm board of an air distribution valve of a braking machine, which is a sealing moving part of the air distribution valve. O-shaped rings of inner and outer rings and a transition region of a connecting curved surface are main sealing regions of the sealing part. The utility model is characterized in that sealing rib rings are arranged on gentle sealing surfaces of the rubber diaphragm board; the sealing performance of the sealing part is enhanced. Meanwhile, the sealing rib rings have sufficient salvage functions for the contraction of size when the sealing part meets the cold.

Description

Brake air slide valve rubber diaphragm

The utility model relates to a kind of rolling stock brake air slide valve rubber diaphragm.

Rubber diaphragm is the sealing movable part in the air slide valve, and the outer ring of lamina membranacea is fixed between cylinder block and the cylinder cap, and inner ring is fixed on the piston, and connection curvature portion thin between the Internal and external cycle plays the transmission action of air pressure.Requirement to rubber diaphragm is a good seal, and is airtight, pneumatic highly sensitive.In existing lamina membranacea Internal and external cycle O shape circle and the intermediate location that is connected curved surface, always having one section, to seal the cambered surface curvature less relatively, and face is milder, and it is less to make rubber diaphragm act on the pressure of sealing face, so sealing effectiveness is not good.In addition, existing lamina membranacea is good in normal temperature state lower seal performance, and when low temperature-45 ℃, sealing property promptly descends, and this is because rubber diaphragm is met after low temperature shrinks, due to the size decreases.

The purpose of this utility model is exactly for a kind of good airproof performance that provides and the new type rubber lamina membranacea that can remedy the lamina membranacea dimensional contraction are provided.

This utility model rubber diaphragm is achieved in that in the O of rubber diaphragm Internal and external cycle shape circle and the intermediate location that is connected curved surface, all on the less and milder relatively sealing surface of curvature, all being equipped with the cross section is square or the sealed muscle circle of arc or triangle, makes the face sealing of sealing member change linear sealing into.

The advanced part of this utility model is: owing to added the sealed muscle circle on the mild cambered surface at rubber diaphragm O shape circle position, make face sealing change linear sealing into, thereby rubber is increased the bounce of sealing surface, improved its sealing property greatly.Simultaneously, the sealed muscle circle that adds is met the problem of cold contraction to rubber diaphragm, has also played sufficient salvage.

Accompanying drawing (1), (2) are rubber diaphragm I and partial schematic diagram thereof.

Accompanying drawing (3), (4) are rubber diaphragm II and partial schematic diagram thereof.

Accompanying drawing (5), (6) are rubber diaphragm III and partial schematic diagram thereof.

Accompanying drawing (7) is a rubber diaphragm I work scheme drawing.

Accompanying drawing (8) is a rubber diaphragm II work scheme drawing.

Accompanying drawing (9) is a rubber diaphragm III work scheme drawing.

Shown in the figure: 1-rubber diaphragm I, 2-rubber diaphragm II, 3-rubber diaphragm III, 4-O shape circle, 5-connect curved surface, 6-sealed muscle circle, 7-cylinder cap, 8-cylinder block, 9-upper piston, 10-lower piston.

Embodiment 1: shown in figure (1), (2), rubber diaphragm I inner ring O shape circle is comparatively mild with the cambered surface that is connected the surface blending position, so be that to add a ring cross-section be square sealed muscle for vertex place that O shape is enclosed the cross section perpendicular diameter line on this cambered surface.Another sealed muscle circle is located on the mild cambered surface at O shape circle top, outer ring, and its position also is the vertex place at O shape circle section.

Embodiment 2: shown in figure (3), (4), rubber diaphragm II Internal and external cycle O shape circle is all comparatively mild with the sealing surface that is connected the surface blending position, so all respectively add the sealed muscle that two ring cross-sections are arc on these two sealing surfaces.

Embodiment 3: shown in figure (5), (6), the bottom of rubber diaphragm III Internal and external cycle O shape circle is two sections milder sealing surfaces with the intermediate location that is connected curved surface, so respectively adding a ring cross-section is leg-of-mutton sealed muscle, the position of sealed muscle circle all is located at the nadir place of the straight vertical radial line of O shape circle section.

Claims

1. brake air slide valve rubber diaphragm is made of Internal and external cycle seal with O ring face and the middle curved surface that connects, and it is characterized in that being equipped with the sealed muscle circle on lamina membranacea Internal and external cycle O shape circle and the comparatively mild sealing surface that is connected the surface blending position.