JPH09100925A - Relief valve structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide relief valve structure that can always display sufficient function as a relief valve having little influence on the opening/closing operation of a valve body and sealing operation and can effectively prevent chattering caused by vibration without influencing the assembling workability of the valve body. SOLUTION: Valve mechanism 9 is composed of a valve guide 10 of inverted recessed shape cross section press-fitted being positioned on the valve cap 6 side, and a valve body 11a of recessed shape cross section positioned on the valve case 2 side and slidably fitted to the outer peripheral surface 10b of the valve guide 10. The terminal part 11x of the valve body 11a is positioned on the outflow side of a fluid W. A compression spring 14 for energizing the valve body 11a always to the valve seat 13a side provided at an inflow port end part 1a in the valve case 2 is mounted in a hollow part 12 between the valve guide 10 and the valve body 11a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the structure of a relief valve used in, for example, an oil tank. More specifically, the relief valve is less affected by foreign matter mixed in oil. It relates to the improvement of the valve. Conventionally, in oil tanks such as lubricating oil used in aircraft, etc., if the pressure inside the tank rises excessively, in order to prevent accidents inadvertently, in order to prevent accidents, the pressure is released to the outside to ensure proper pressure inside the tank. A relief valve that keeps the pressure constant is provided.

By the way, as a structure of a conventional relief valve, for example, as shown in FIG. 3, a valve case 2 having an inflow port 1 for a fluid W (pneumatic pressure) and having a concave cross-section attached to the body side, and this valve case Screw 3 on the opening side of 2
And a valve cap 6 which is detachably fitted through an O-ring 4 and the like, and which is provided with an outlet 5 for the fluid W. A valve mechanism 9 for opening and closing the flow path 8 according to the pressure of the fluid W is provided in the hollow 7 between the valve case 2 and the valve cap 6.

The valve mechanism 9 is located on the side of the valve cap 6 and has a valve guide 10 formed in a reverse concave cross section.
And a valve body 11 having a concave cross-section located on the side of the valve case 2 slidably fitted in the recess 10a of the valve guide 10, and inside the hollow portion 12 between the valve guide 10 and the valve body 11. The valve seat 1 in which the valve body 11 is provided at the inlet end 1a in the valve case 2.
A compression spring 14 that constantly urges is provided inside the 3 side. The valve seat 13 is airtightly attached to the inlet end 1a in the valve case 2 via an O-ring 15.

[0004]

By the way, in the conventional valve mechanism 9 as described above, the valve body 11 slides along the inner wall surface of the valve guide 10 as described above. When foreign matter enters the oil or the like and enters the valve mechanism 9 through the inflow port 1, the foreign matter adheres or adheres to a portion of the outer peripheral surface of the valve body 11 as shown in A part of FIG. There is a problem that it hinders the sliding operation of the valve body 11 and affects the opening / closing operation of the valve body 11.

Further, since the conventional seal portion X between the valve body 11 and the valve seat 13 has a surface contact seal structure, even if the above-mentioned foreign matter adheres to or adheres to the seal portion X. However, there is a problem that the valve body 11 cannot be completely closed and the function as the relief valve is impaired. The present invention was devised by focusing on such conventional problems, and even if foreign matter enters the valve mechanism, it does not affect the opening and closing operation of the valve body and the sealing operation, and It can fully exert its function as a relief valve,
Another object of the present invention is to provide a structure of a relief valve that does not affect the workability of assembling the valve body and can effectively prevent chattering due to vibration.

[0006]

In order to achieve the above object, the present invention fits the valve body on the valve guide located on the valve cap side so that the end portion of the valve body is located on the fluid outflow side. The summary is that it is configured as described above. Further, according to the present invention, a valve seat having an annular contact surface having a conical surface is provided at an inlet end portion in the valve case, and the valve body has a spherical shape that makes line contact with the annular contact surface of the valve seat. The gist is that the sealing surface is formed.

Further, according to the present invention, the valve body is fitted to the valve guide located on the valve cap side so that the end portion of the valve body is located on the outflow side of the fluid. A gist is that a valve seat having a conical annular contact surface is provided at an end, and a spherical sealing surface that comes into line contact with the annular contact surface of the valve seat is provided at the valve body. is there.

The present invention is constructed as described above, and the valve body is fitted on the valve guide located on the valve cap side so that the end portion of the valve body is located on the fluid outflow side. At the inlet end of the valve case,
Since a valve seat having a conical annular contact surface is provided, and a spherical sealing surface that makes line contact with the annular contact surface of the valve seat is provided on the valve body, foreign matter is attached to the outer peripheral surface of the valve body. There is little adhesion, and since the valve seat and the valve body are in line contact with each other, foreign matter does not get caught in the sealing surface, the opening and closing operation of the valve body,
It does not affect the sealing operation, can always fully exert its function as a relief valve, does not affect the workability of assembling the valve body, and can effectively prevent chattering due to vibration. Is.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings. The same components as those in the conventional example are denoted by the same reference numerals, and description thereof will be omitted. FIG. 1 is a vertical cross-sectional view of a relief valve embodying the present invention, and FIG. 2 is a plan view of FIG. 1. The relief valve is a cross-section attached to a body side having an inlet 1 for a fluid W (air pressure) It is composed of a concave valve case 2 and a valve cap 6 which is detachably fitted to the opening side of the valve case 2 via a screw 3 and an O-ring 4 and has an outlet 5 for the fluid W. ing. A valve mechanism 9 that opens and closes the flow path 8 according to the pressure of the fluid W is provided in the hollow portion 7 between the valve case 2 and the valve cap 6.

The valve mechanism 9 is formed on the valve cap 6 side and has a reverse concave cross-section, and is press-fitted. A valve case is slidably fitted on an outer peripheral surface 10b of the valve guide 10. The valve body 11a having a concave cross-section located on the second side, the terminal portion 11x of the valve body 11a is arranged on the outflow side of the fluid W, and the hollow portion between the valve guide 10 and the valve body 11a. A compression spring 14 is installed inside the valve body 12 to constantly urge the valve body 11a toward the valve seat 13a provided at the inlet end 1a in the valve case 2.

The valve seat 13a is assembled with the valve cap 6 through the O-ring 15 at the inlet end 1a in the valve case 2 by a fitting method. As described above, by assembling the valve seat 13a and the valve cap 6 by the fitting method, the mutual coaxiality (deviation of the shaft center, etc.) between the respective parts is managed within a very strict range of about 0.01 mm. It is something that can be done.

At the inlet end 1a in the valve case 2, the valve seat 13a having a spherical annular contact surface 17 is provided, and at the valve body 11a,
A sealing surface 18 having a spherical cross section is provided in line contact with the annular contact surface 17 of the valve seat 13a. in this way,
An annular contact surface 17 having a truncated cone shape in section of the valve seat 13a
And the valve body 11a having the spherical sealing surface 18 are configured to open and close the flow path 8 of the fluid W, the opening and closing operation of the valve can be reliably performed, and at the time of assembling work. It has a good spherical core property, and since it is assembled by a fitting method, chattering due to vibration can be effectively prevented.

The present invention is constructed as described above, and the valve body 11a is fitted to the valve guide 10 located on the valve cap 6 side, and the terminal portion 11 of the valve body 11a is fitted.
x is located on the outflow side of the fluid W, a valve seat 13a having a spherical annular contact surface 17 is provided at the inlet end 1a in the valve case 2, and the valve body 11a is provided with The annular contact surface 17 of the valve seat 13a
Since the conical surface-shaped sealing surface 18 that comes into line contact with is provided, foreign matter is less likely to adhere to the outer peripheral surface of the valve body 11a.
Since they are in line contact with each other, foreign matter is not caught in the sealing surface, and there is little influence on the opening / closing operation and the sealing operation of the valve body 11a, and the function as a relief valve can always be sufficiently exerted. Also, the workability of assembling the valve body is not affected, and chattering due to vibration can be effectively prevented.

[0014]

Since the present invention is configured as described above, even if foreign matter enters the valve mechanism, the foreign matter is less likely to adhere to the outer peripheral surface of the valve body or the inner wall surface of the valve guide. In addition, since the valve seat and the valve body are the sealing surface due to the line contact, it does not affect the opening and closing operation and the sealing operation of the valve body, and the function as a relief valve can always be fully exerted. Since the valve body and the valve seat are in line contact between the spherical surface and the conical surface, the alignment of the shaft center is easy, and there is an effect that assembly workability and chattering due to vibration can be effectively prevented.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view of a relief valve embodying the present invention.

FIG. 2 is a plan view taken along the line AA of FIG. 1;

FIG. 3 is a vertical sectional view of a conventional relief valve.

[Explanation of symbols] 1 fluid inlet 2 valve case 3 screw 4 O-ring 5 fluid outlet 6 valve cap 7 hollow part 8 flow passage 9 valve mechanism 10 valve guide 10b outer peripheral surface 11a valve body 11x terminal part 12 hollow part 13a Valve seat 14 Compression spring 15 O-ring 17 Spherical annular contact surface 18 Sealing surface with conical cross section W Fluid

Claims (3)

[Claims] 1. A valve case having a fluid inlet,
A valve cap that is detachably fitted to the valve case and that has a fluid outlet, and a hollow inside of the valve case and the valve cap, on the side of the valve cap that opens and closes the flow path according to the fluid pressure. In a structure of a relief valve including a valve mechanism including a valve guide located on a valve case side and a valve body located on a valve case side, a valve body is fitted to a valve guide located on the valve cap side, and a terminal of the valve body is fitted. A structure of a relief valve, characterized in that the part is arranged on the outflow side of the fluid. 2. A valve case having a fluid inlet,
A valve cap that is detachably fitted to the valve case and that has a fluid outlet, and a hollow inside of the valve case and the valve cap, on the side of the valve cap that opens and closes the flow path according to the fluid pressure. In a structure of a relief valve provided with a valve mechanism including a valve guide located on the valve case side and a valve body located on the valve case side, a valve having a conical annular contact surface at an inlet end portion in the valve case. A structure of a relief valve, characterized in that a seat is provided, and a spherical sealing surface that makes line contact with the annular contact surface of the valve seat is formed in the valve body. 3. A valve case having a fluid inlet,
A valve cap that is detachably fitted to the valve case and that has a fluid outlet, and a hollow inside of the valve case and the valve cap, on the side of the valve cap that opens and closes the flow path according to the fluid pressure. In a structure of a relief valve including a valve mechanism including a valve guide located on a valve case side and a valve body located on a valve case side, a valve body is fitted to a valve guide located on the valve cap side, and a terminal of the valve body is fitted. A valve seat having a conical annular contact surface at the inlet end of the valve case, and the valve body is provided with an annular shape of the valve seat. A structure of a relief valve characterized in that a spherical sealing surface is provided in line contact with the contact surface.