JP5110252B2 - Valve seal structure - Google Patents

Description

  The present invention relates to a valve seal structure in which a pair of seal elements come in contact with and separate from each other in accordance with the opening and closing operation of the valve. The seal structure of the present invention is used, for example, in an opening / closing operation part of a high pressure gas valve for a fuel cell.

In the conventional valve device 51 shown in FIG. 4, when the valve is closed, the rubber packing 53 on the valve body side which is one seal element contacts and separates from the valve seat surface 52 on the valve body side which is the other seal element. The rubber packing 53 is pressed against the valve seat surface 52 with a predetermined crushing margin when abutting (the arrow A in the figure indicates the flow of fluid (gas) when the valve is opened). Direction).

  However, in recent years, in order to achieve high accuracy of fluid flow control, it is required to set the dimension of the flow path width C formed between the valve seat surface 52 and the rubber packing 53 with high accuracy when the valve is opened. In this respect, since the rubber packing 53 is liable to sag on its material, it cannot sufficiently meet this requirement. In addition, since the processing accuracy of rubber is not as high as that of metal processing, an error is likely to occur in the channel width C.

  Incidentally, the applicant of the present application has previously proposed a valve structure described in Patent Document 1 or 2 below as a valve using a leaf spring, but these prior arts all attach the valve body to the valve housing. Therefore, a leaf spring is used, and a leaf spring member is not used as a direct sealing element as in the present invention.

JP 2006-156868 A JP 2003-197383 A

  In view of the above, the present invention provides a valve seal structure that is less likely to sag, such as rubber packing, in a seal element and that can set the flow path width formed when the valve is opened with high accuracy. The purpose is to do.

To achieve the above object, the seal structure of the present invention is a valve seal structure in which a pair of seal elements come in contact with and separate from each other in accordance with the opening and closing operation of the valve. The sealing element has a shape obtained by processing a flat plate into a three-dimensional structure in advance and is made of a leaf spring member capable of exhibiting spring properties when compressed, and a seal rubber is attached to the contact portion of the leaf spring member, the plate spring member is formed annularly by a hard plate, which is mounted on an annular mounting groove formed in the end surface of the holding member, the plate spring member is fixed portion disposed on the bottom surface of the mounting groove And the axially rising portion and the abutting portion are integrally formed into a substantially U-shaped or U-shaped cross section , and the seal rubber is formed only on the outer end surface of the abutting portion of the leaf spring member. characterized in that it is deposited

  Instead of the conventional rubber packing as one seal element combined with the other seal element as in the seal structure of the present invention having the above configuration, a plate spring member that exhibits a spring property at the time of compression using a flat plate as a three-dimensional structure in advance. When used, the leaf spring member is unlikely to sag on the material, and the processing accuracy can be easily obtained, so that the flow path width when the valve is opened can be set with high accuracy. The leaf spring member is manufactured in advance as a three-dimensional structure so as to exhibit elastic properties by being elastically deformed when compressed, and examples of the structure include a substantially U-shaped cross-section having an elastic lip piece in part or U It is preferable to use a letter shape.

  The present invention has the following effects.

  That is, as described above, in the seal structure of the present invention, as one seal element combined with the other seal element, a plate spring having a shape in which a flat plate is processed into a three-dimensional structure in advance and exhibiting spring properties when compressed Since a member is used, and this leaf spring member is less likely to be slid on the material and processing accuracy is easily obtained, it is possible to set the flow path width when the valve is opened with high accuracy. . Therefore, according to the intended purpose of the present invention, the seal element is less likely to sag, so that the width of the flow path formed when the valve is opened can be set with high accuracy, and the valve can contribute to high accuracy of flow control. A seal structure can be provided.

Further, since the sealing rubber is attached to the outer end face of the contact portion of the leaf spring member at one point, a slight leak does not occur when the valve is closed. Further, since the seal rubber attached to the contact portion of the leaf spring member is sufficiently thin as compared with the conventional rubber packing, the sag does not become a problem.

  The present invention includes the following embodiments.

  That is, by using a leaf spring, a stable seal reaction force is produced, and the influence of changes over time due to rubber sag or the like is eliminated. Then, the rubber is baked on the contact surface to prevent fine leakage and to ensure sealing performance.

  Next, embodiments of the present invention will be described with reference to the drawings.

First embodiment ...
FIG. 1 shows a valve seal structure according to a first embodiment of the present invention .

  The seal structure according to the first embodiment is such that a pair of seal elements come in contact with and separate from each other in accordance with the opening / closing operation of the valve, and the pair of seal elements is made of a rigid part such as metal. The valve seat surface 2 and a leaf spring member 6 on the valve body 4 side that comes into contact with and separates from the valve seat surface 2 are configured.

  The leaf spring member 6 is formed in an annular shape by a rigid plate such as a metal plate, and is attached to an annular attachment groove 5 provided on the end face of the valve body 4 as a holding member, and comes into contact with the valve seat surface 2 when the valve is closed. The valve hole 1 on the valve body 1 side is closed, and is further configured as follows.

  That is, the leaf spring member 6 has a shape obtained by processing a flat plate (metal flat plate) into a three-dimensional structure in advance, and can exhibit a spring property during compression. Specifically, as shown in FIG. It is formed as an annular body having a substantially U-shaped cross section with the side (low pressure side) open, and a fixed portion (fixed plate portion) 6a disposed on the bottom surface 5a side of the mounting groove 5 and an axial rising portion (rising) (Plate part) 6b and the contact part (contact plate part) 6c arrange | positioned at the valve-seat surface 2 side are integrally provided. In the above U-shape, the inner diameter side of the valve is opened, but the outer diameter side (high pressure side) of the valve may be opened instead, that is, only one of the radial directions may be opened. . The abutting portion 6c forms an elastic lip piece of the leaf spring member 6. At least the tip portion of the abutting portion 6c protrudes to the outside of the mounting groove 5, and an annular seal rubber 7a is formed on the outer end surface (upper surface in the drawing). The seal rubber 7a is attached (adhered) and is in close contact with the valve seat surface 2 so as to be freely contacted and separated.

  The seal rubber 7 a is provided in a lip shape as a part of the rubber-like elastic body 7 attached to the outer surface of the metal leaf spring member 6. In addition to the seal rubber 7a, the rubber-like elastic body 7 is attached to the outer end surface (the lower surface in the drawing) of the fixed portion 6a, and seals between the fixed portion 6a and the bottom surface 5a of the mounting groove 5. And a third seal rubber 7c which is attached to the outer peripheral surface of the rising portion 6b and seals between the rising portion 6b and the side surface 5b of the mounting groove 5 is integrally provided.

  The leaf spring member 6 to which the rubber-like elastic body 7 is attached is mounted in a mounting groove 5 provided in the valve body 4 as shown. The figure shows the valve open state, and the high-pressure gas that is the transfer fluid flows in the direction of arrow A. When the valve closing operation is started by excitation of the solenoid or the like from this valve open state and the valve body 4 moves in a direction approaching the valve seat surface 2, the seal rubber 7a attached to the contact portion 6c of the leaf spring member 6 is Abutting on the seating surface 2 and being compressed, a valve closing force is also applied to the leaf spring member 6, and the leaf spring member 6 is elastically deformed so as to narrow the U-shaped opening width, and the reaction force causes the seal rubber 7a to be The valve is pressed firmly against the seat surface 2 to realize the valve closed state.

  The leaf spring member 6 formed of a metal plate is unlikely to sag even if it is repeatedly elastically deformed. Further, the plate spring member 6 formed of a metal plate is easy to obtain processing accuracy at the time of production. Therefore, the flow path width C formed between the valve seat surface 2 and the seal rubber 7a when the valve is opened can be set and maintained with high accuracy over a long period of time.

  Further, since the seal rubber 7a is attached to the contact portion 6c of the leaf spring member 6 and the seal rubber 7a is in close contact with the valve seat surface 2, so-called metal touch does not occur when the valve is closed. It is possible to prevent a minute leak caused by a metal touch.

  Further, since the seal rubber 7a is a rubber material, there is a concern about its sag. However, since the seal rubber 7a is set sufficiently thin, the sag does not become a problem.

Second embodiment ...
In the first embodiment, the seal rubber 7a is integrally formed with the second and third seal rubbers 7b and 7c as a part of the rubber-like elastic body 7. Instead, as shown in FIG. 6 may be attached to the outer end face of the abutting portion 6c at one point. In this case, when there is a concern about the sealing performance between the leaf spring member 6 and the valve body 4, both the members 4 and 6 are welded and fixed in an annular shape by the welded portion 8.

Third embodiment ...
Further, instead of welding, as shown in FIG. 3, the second seal rubber 7b is attached to the outer end face of the fixed portion 6a of the leaf spring member 6 at one point to seal between the four and six. good.

Further, the cross-sectional shape of the leaf spring member 6 may be substantially U-shaped as shown in FIG. 2 or 3 instead of the U-shape. The U-shape shown in the figure is open on the inner diameter side (low pressure side), but instead, the outer diameter side (high pressure side) may be opened, that is, one of the radial directions is opened. Just do it.

Sectional drawing of the principal part of the seal structure which concerns on 1st Example of this invention. Sectional drawing of the principal part of the seal structure which concerns on 2nd Example of this invention. Sectional drawing of the principal part of the seal structure which concerns on 3rd Example of this invention. Cross-sectional view of the main part of the seal structure according to the conventional example

1 valve body
2- valve seat
3 valve holes
4 valve body 5 mounting groove 5a bottom surface 5b side surface
6 leaf spring member 6a fixed part 6b rising part
6c contact part 7 Rubber elastic body
7a, 7b, 7c seal rubber
8 welds

Claims (1)

In the valve seal structure in which the pair of seal elements are in contact with each other in accordance with the opening / closing operation of the valve,
One seal element that comes into contact with and separates from the other seal element is a plate spring member that has a shape in which a flat plate has been processed into a three-dimensional structure in advance and can exhibit springiness during compression. Seal rubber is attached to the contact area,
The leaf spring member is formed into an annular shape by a rigid plate, and is attached to an annular attachment groove provided on an end surface of the holding member,
The leaf spring member is integrally formed with a fixed portion disposed on the bottom surface of the mounting groove, an axial rising portion, and the contact portion, and is formed into a substantially U-shaped or U-shaped cross section ,
The valve seal structure according to claim 1, wherein the seal rubber is attached only to an outer end face of the contact portion of the leaf spring member .

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