JPH0687682U - Diaphragm - Google Patents

Abstract

(57) [Summary] [Purpose] An object of the present invention is to provide a diaphragm that can further prolong its life by improving the durability of the diaphragm. A flexible diaphragm main body 1 having a drive shaft 2 attachable to one side surface and a plurality of substantially concentric annular concavo-convex surface portions 4 formed on the other side surface, and the diaphragm 1
Sheet material 6 closely attached to cover the other side surface
It consists of and.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a diaphragm, and more particularly, to an improvement of a diaphragm for a so-called direct-acting diaphragm pump in which the diaphragm is directly driven by a drive shaft.

[0002]

[Prior art]

 Conventionally, as this type of diaphragm, there is one as shown in FIG. 5, for example.

That is, in this conventional one, the drive shaft 2a is provided in the center of one side surface of the rubber diaphragm main body 1a, and the other side surface is made of fluororesin or the like to protect the diaphragm main body 1a from a circulating fluid such as an organic solvent. A relatively thick sheet material 6a is attached, and such a diaphragm is attached so that the other side surface is located on the pump chamber side of the diaphragm pump, and the diaphragm body 1a is attached via the drive shaft 2a. It will be configured so that it can reciprocate.

[0004]

[Problems to be solved by the device]

 However, the diaphragm body 1a made of rubber has sufficient strength and flexibility for the reciprocating motion, but the thick sheet material 6a lacks flexibility, and thus the diaphragm body accompanying the reciprocating motion. The sheet material 6a may not be able to follow the deformation of the sheet material 1a, and as a result, a part of the sheet material 6a may peel off from the diaphragm body 1a to cause wrinkles in the sheet material 6a, or cracks may occur through the wrinkles. It was

When such a crack is generated, a circulating fluid such as an organic solvent penetrates into the inside of the crack, so that the diaphragm body 1a is corroded and a pinhole or the like is generated. It had a problem that its life was decided.

In particular, in a so-called direct-acting diaphragm pump diaphragm in which the diaphragm is directly driven by the drive shaft, such a problem is likely to occur.

Therefore, the present invention has been made in order to solve the above-mentioned conventional problems, and an object thereof is to provide a diaphragm which can further prolong its life by improving the durability of the diaphragm.

[0008]

[Means for Solving the Problems]

 That is, in order to solve the above problems, the present invention has a flexible diaphragm in which the drive shaft 2 is attachable to one side surface and a plurality of substantially concentric annular concavo-convex surface portions 4 are formed on the other side surface. The diaphragm is composed of a main body 1 and a sheet material 6 provided in close contact with the other side surface of the diaphragm main body 1 so as to cover it.

[0009]

[Action]

 Therefore, in the diaphragm having the above-mentioned structure, a plurality of substantially concentric annular concavo-convex surface portions 4 are formed on the other side surface of the diaphragm body 1, and the sheet material 6 is provided to cover the other side surface. Therefore, even if the diaphragm reciprocates, the forward / backward movement is absorbed by the annular concave-convex surface portion 4, so that the sheet material 6 can follow the deformation of the diaphragm body 1 due to the reciprocating movement. The close contact between the material 6 and the diaphragm body 1 is maintained well.

[0010]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

In FIGS. 1 to 4, reference numeral 1 denotes a diaphragm main body made of rubber or the like and having a substantially circular front shape, and a mandrel 3 having a drive shaft 2 connected to a drive means at a substantially central portion of one side surface thereof. Is formed, and a plurality of substantially concentric concavo-convex surface portions 4 are formed on the other side surface, and the positions are configured to have a substantially corrugated cross section. Reference numeral 5 is a reinforcing fiber material embedded inside the diaphragm body 1 in order to reinforce it.

Reference numeral 6 denotes a sheet material made of fluororesin provided over the entire other side surface of the diaphragm body 1 so as to cover the other side surface thereof, and is bonded with an adhesive.

The diaphragm according to this embodiment has the above-described structure. The diaphragm is mounted in the pump so that the other side surface of the diaphragm body 1 is located on the pump chamber side, and the diaphragm is arranged in the front-back direction. In order to reciprocate, the drive shaft 2 is connected with a drive means such as an electric motor through a link mechanism or the like.

Since a plurality of substantially concentric concavo-convex surface portions 4 are formed on the other side surface of the diaphragm main body 1 and a sheet material 6 made of fluororesin is adhered to this, the sheet material 6 is used. Although the other side surface of the diaphragm body 1 is protected, the reciprocating movement of the diaphragm body 1 is absorbed by the uneven surface portion 4, so that the reciprocating movement is possible even if the sheet material 6 is formed relatively thick. Therefore, the deformation of the diaphragm body 1 due to the above can be favorably followed.

Therefore, as a result of the good adhesion between the diaphragm body 1 and the sheet material 6, the sheet material 6 peels off, causing wrinkles and cracks on the surface thereof, and the diaphragm body 1 is protected from organic solvent or the like. It is possible to avoid a situation where the circulating fluid corrodes.

Therefore, as a result of the diaphragm body 1 being favorably protected by the sheet material 6, the durability life thereof is significantly improved, and the diaphragm body 1 can be used for a long period of time.

Further, the diaphragm according to the present embodiment has an advantage that it can be manufactured inexpensively and easily because of its simple structure.

In the above-mentioned embodiment, the uneven surface portion 4 is configured to have a concentric circular shape and a substantially corrugated cross section, but the specific shape is not limited to this, and the point is that The concavo-convex surface portion 4 may be formed in a substantially concentric and annular shape so that the reciprocating movement of the flam body 1 can be absorbed and the close contact with the sheet material 6 can be maintained.

The overall shape and material of the diaphragm body 1 are not limited to those in the above embodiment.

Further, the material of the sheet material 6 is not limited to the fluororesin, but can be changed according to the type of the circulating fluid, and the point is that the diaphragm body 1 can be covered and protected from the circulating fluid. .

Further, in the above embodiment, the sheet material 6 is adhered to the other side surface of the diaphragm body 1 with an adhesive, but the means for bringing the two into close contact is not limited to this.

[0022]

[Effect of device]

 As described above, according to the present invention, since a plurality of annular uneven surface portions are formed on the other side surface of the diaphragm body and the sheet material is closely attached to cover the other end surface, the reciprocating movement of the diaphragm is The sheet material can be absorbed by the annular uneven surface portion, so that the sheet material can follow the deformation of the diaphragm main body due to the reciprocating operation, as compared with the conventional one having no such annular uneven surface portion.

Therefore, unlike the conventional one, there is no fear that the sheet material will be peeled off from the diaphragm body to cause wrinkles or cracks in the sheet material, so that the close contact state between them can be maintained well. As a result of being able to suitably protect the diaphragm main body from the circulating fluid, it has come to obtain a particular effect that the durability life thereof is significantly improved as compared with the conventional one.

Further, as described above, the diaphragm according to the present invention has an extremely simple overall structure, and therefore has a practical effect that the diaphragm can be manufactured easily at low cost.

[Brief description of drawings]

FIG. 1 shows a diaphragm according to the present invention, in which (a) is a front view and (b) is a rear view.

FIG. 2 is a side view of the same.

FIG. 3 is a sectional view of the same.

FIG. 4 is an enlarged cross-sectional view of the relevant part.

FIG. 5 is a sectional view of a diaphragm showing a conventional example.

[Explanation of symbols]

 1 ... Diaphragm main body 2 ... Drive shaft 4 ... Annular uneven surface portion 6 ... Sheet material

Claims (2)

[Scope of utility model registration request] 1. A flexible diaphragm body (1) having a drive shaft (2) attachable to one side surface and a plurality of substantially concentric annular concavo-convex surface portions (4) formed on the other side surface. And a sheet material (6) provided in close contact with the diaphragm body (1) so as to cover the other side surface of the diaphragm body (1). 2. The diaphragm according to claim 1, wherein the annular concavo-convex surface portion (4) has a substantially corrugated cross section.