JPH0680958U - Mounting structure of metal diaphragm - Google Patents

Abstract

(57) [Summary] [Purpose] To enable a metal diaphragm to be installed in a good seal and in an appropriate shape. [Structure] A pair of gaskets 13, each of which is made of a metal ring having a thicker wall than the peripheral portion of the metal diaphragm 11,
It is sandwiched by 14 and these joints are welded 15 over the entire outer circumference thereof, and the peripheral edge of the diaphragm 11 is interposed between the annular mounting surfaces 1a, 5a via both gaskets 13, 14 integrated with this. Support by pinching.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a mounting structure for a metal diaphragm in a diaphragm type disc valve or the like.

[0002]

[Prior art]

 In the conventional structure of this type, it is usual that the opposing annular mounting surfaces are formed so as to be clamped, and the peripheral edge of the metal diaphragm is clamped and supported between the annular mounting surfaces.

[0003]

[Problems to be solved by the device]

 However, since the metal diaphragm is usually constructed by stacking about 2 to 5 ultra-thin metal plates (about 0.1 to 0.2 mm), the peripheral edge of the metal diaphragm is sufficiently tightened over the entire circumference. It is difficult to pinch between the annular mounting surfaces by pressure. For this reason, the sealing force at the pinching portion of the diaphragm is insufficient, and there is a risk that fluid may leak from between the diaphragm and the annular mounting surface. Further, the diaphragm made of an ultra-thin metal plate is easily deformed when it is handled and assembled, and it is difficult to assemble it in a proper shape. When such deformation occurs, not only the original function of the diaphragm is not exhibited well, but also the above-mentioned insufficient sealing force is promoted. Such a problem is relatively unlikely to occur when the diameter of the diaphragm is small, but becomes more remarkable as the diameter of the diaphragm increases.

In order to solve such a problem, an annular protrusion is formed on the annular mounting surface, that is, the clamping pressure area of the diaphragm is reduced, and the clamping surface pressure at the peripheral edge of the diaphragm is increased as much as possible. Although it has been attempted to devise such a method, it is not a reliable solution because it does not ensure a sufficient sealing force. On the contrary, the reduction of the clamping area may lead to the inconvenience of insufficient supporting strength of the diaphragm. Of course, there is no solution to the deformability of the diaphragm.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a metal diaphragm mounting structure capable of mounting the diaphragm in a well-sealed state and in an appropriate state.

[0006]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the metal diaphragm mounting structure of the present invention, in particular, sandwiches the peripheral portion of the metal diaphragm with a pair of gaskets made of a metal ring having a thickness larger than that of the metal diaphragm. The joint portion is welded over the entire outer periphery thereof, and the peripheral edge portion of the diaphragm is clamped and supported between the annular mounting surfaces via both gaskets integrated with this.

[0007]

[Action]

 The peripheral edge of the diaphragm is clamped and supported between the annular mounting surfaces via a pair of thick gaskets sandwiching the diaphragm, so that sufficient clamping surface pressure can be secured over the entire circumference. Therefore, with the fact that the joint between the diaphragm and the gasket is welded over the entire outer periphery thereof, there is no risk of fluid leaking between the diaphragm and the annular mounting surface.

[0008] Although the diaphragm itself is easily deformable, since a thick gasket that is difficult to deform is fixed to the peripheral edge of the diaphragm, the diaphragm can be deformed as much as possible due to the reinforcing effect. To be prevented. Therefore, the diaphragm is not deformed unexpectedly during handling, and in combination with the above, the diaphragm can be attached in a good sealed state and in an appropriate form.

[0009]

【Example】

 Hereinafter, the configuration of the present invention will be specifically described with reference to the embodiments shown in FIGS. This embodiment relates to an example in which the present invention is applied to a diaphragm mounting structure in a diaphragm type disc valve.

In the diaphragm type disc valve shown in FIG. 1, 1 is a body in which fluid passages 3 and 4 communicating with a valve chamber 2 are formed, and 5 is attached to the body 1 via a plurality of bolts and nuts 6 ... A bonnet, 7 a stem supported by the bonnet 5 so as to be screwed freely, 8 a disc attached to the stem 7 via a packing retainer 9, 10 a disc packing attached to the disc 8, and 11 a body 1 It is a circular metal diaphragm that is clamped and supported between annular mounting surfaces 1a and 5a formed on the surface facing the bonnet 5.

In this disc valve, the stem 7 is moved forward and backward by the handle 12 to bring the disc packing 10 into and out of contact with the valve seat 1b formed in the body 1. , 4 is opened and closed, and in particular, the mounting structure of the diaphragm 11 is constructed as follows according to the present invention.

That is, as shown in FIG. 2, the diaphragm 11 is formed by stacking 2 to 5 ultra-thin metal plates made of stainless steel (diameter: 94 mm, thickness: 0.1 to 0.2 mm) and surrounding them. A pair of gaskets 13 and 14 made of metal rings are welded to the edges. That is, the peripheral edge of the diaphragm 11 is sandwiched between the gaskets 13 and 14, and the three-layered joint is welded 15 over the entire outer periphery thereof. The gaskets 13 and 14 are thick enough to secure a predetermined tightening surface pressure and to exert a reinforcing effect on the diaphragm 11 according to various conditions such as the diaphragm diameter, and the material thereof is also welded. It is appropriately selected on the condition that it is possible. In this embodiment, the gaskets 13 and 14 are NLCP rings having a thickness of about 3 mm and an outer diameter of 94 mm, which is the same as the diaphragm diameter.

Further, a cylindrical valve retainer 9 and an annular diaphragm welding fitting 16 are fixed to both sides of the central portion of the diaphragm 11 and fixed to each other. That is, as shown in FIG. 2, the peripheral portion of the stem passage hole 11a formed in the central portion of the diaphragm 11 and the inner peripheral edge portion of the valve retainer 9 and the welding fitting 16 are welded 17 over the entire circumference thereof. There is. As a result, the plurality of thin metal plates that form the diaphragm 11 are inseparably integrated not only in the peripheral portion but also in the central portion, and the fluid flows between the thin metal plates from the stem passage hole 11a. There is no intrusion. The valve retainer 9 and the welding fitting 16 are made of SUS316L.

As shown in FIGS. 1 and 2, the diaphragm 11 has a three-layered annular portion composed of its peripheral portion and the gaskets 13 and 14 sandwiched between the annular mounting surfaces 1a and 5a. By tightening the bolts / nuts 6 ..., they are clamped and supported between the body 1 and the bonnet 5.

In the mounting structure of the metal diaphragm 11 configured as described above, the peripheral edge of the diaphragm 11 is between the annular mounting surfaces 1a and 5a via the thick gaskets 13 and 14 that sandwich the diaphragm. Since it is clamped and supported by, the sufficient tightening surface pressure is secured over the entire circumference. Therefore, in combination with the fact that the joint between the diaphragm 11 and the gaskets 13 and 14 is welded 15 over the entire outer circumference, the inside of the valve chamber 2 is between the diaphragm 11 and the annular mounting surfaces 1a and 5a. There is no risk of leakage of fluid.

Moreover, although the diaphragm 11 is easily deformed by stacking a plurality of ultra-thin stainless steel plates, the diaphragm 11 is integrally fixed to the peripheral portion of the diaphragm 11 by the reinforcing effect, so that the diaphragm 11 as a whole is The strength has been greatly improved. Therefore, the diaphragm 11 is not deformed unexpectedly during handling or assembly, and in combination with the above, the diaphragm 11 can be attached in a good sealed state and in an appropriate form. The original function can be fully exerted.

The present invention is not limited to the above-described embodiments, but can be appropriately improved and modified within a range that does not deviate from the basic principle of the present invention. INDUSTRIAL APPLICABILITY The present invention can be applied to the case where the diaphragm is composed of a single thin metal plate or the case where it is not necessary to form a through hole such as the stem passage hole 11 in the central portion of the diaphragm. The attached structure can be suitably applied to not only the diaphragm type disc valve but also various valves using the diaphragm and other devices.

[0018]

[Effect of device]

 As is clear from the above explanation, according to the present invention, the fatal defect can be eliminated from the structure of the metal diaphragm as described at the beginning, and the diaphragm can be mounted in a good seal state and in an appropriate shape. The function of the diaphragm can be fully exerted.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a metal diaphragm mounting structure according to the present invention.

FIG. 2 is a detailed view showing an enlarged main part of FIG.

[Explanation of symbols]

1 ... Body, 1a, 5a ... Annular mounting surface, 5 ... Bonnet, 11 ... Diaphragm, 13, 14 ... Gasket, 1
5 ... Welding.

Claims (1)

[Scope of utility model registration request] 1. A peripheral edge portion of a diaphragm made of metal is sandwiched between a pair of gaskets made of a metal ring having a larger wall thickness, and a joint portion of these three layers is welded over the entire outer periphery thereof. The metal diaphragm mounting structure is characterized in that it is clamped and supported between the annular mounting surfaces via both gaskets integrated with this.