JPH04106558U - diaphragm - Google Patents

Abstract

(57) [Summary] [Purpose] Even when compression set occurs in the bead portion 3, sufficient sealing performance can be ensured and good operation of the diaphragm 1 can be maintained. [Structure] It has a seal forming bead portion 3 formed on the periphery of the membrane portion 2, and the bead portion 3 is accommodated in a bead portion storage chamber 6 in a compressed state on its inner wall surfaces 6a and 6b. In the diaphragm 1, side lip portions 8 and 9 are formed along the circumferential direction on the bead portion 3, and the side lip portion 8
is the inner wall surface 6 under the fluid pressure acting on the diaphragm 1.
A is crimped to form a seal portion.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention relates to a diaphragm of a diaphragm device.

0002

[Conventional technology]

Conventionally, a diaphragm was formed on the periphery of the membrane portion 2, as shown in FIG. 5 or 6. A diaphragm 1 having a seal-forming bead portion 3, wherein the bead portion 3 is , the die is accommodated in the bead portion accommodation chamber 6 in a compressed state on its inner wall surfaces 6a and 6b. Ahram is known.

0003

[Problem that the idea aims to solve]

However, in the conventional diaphragm mentioned above, the bead portion 3 has a compression set (so-called If the housing chamber 6 becomes loose or sag, it will not be able to follow the dimensional changes of the housing chamber 6 due to heat, vibration, etc. Scratches, the sealing performance becomes incomplete, and the fluid pressure acting on the membrane part 2 of the diaphragm 1 decreases. There was a risk that the diaphragm 1 would malfunction after a while.

0004 This invention solves the above problems and is effective when compression permanent strain occurs in the bead portion 3. Even if the diaphragm 1 The challenge is to provide a diaphragm that can hold up.

[0005]

[Means to solve the problem]

In order to solve the above problems, the diaphragm according to this invention, It has a seal forming bead portion formed on the periphery of the membrane portion, and the bead portion is The diaphragm, which is housed in the storage chamber in a compressed state on its inner wall surface, There, forming a side lip portion along the circumferential direction in the bead portion; The side lip portion receives the fluid pressure acting on the diaphragm and the inner wall surface. is configured to be crimped to form a seal. It is characterized by

[0006]

[Actions and effects of the idea]

According to the diaphragm according to this invention, when compressive deformation strain occurs in the bead part, Even if the side lip part is exposed to the fluid pressure acting on the membrane part, the inside of the bead part housing chamber will be damaged. Since it is crimped to the wall surface and a seal is formed, sealing performance is ensured and the diaphragm can maintain good operation.

[0007]

【Example】

An embodiment of this invention will be described below with reference to FIGS. 1 to 4.

[0008] First embodiment (Fig. 1 (A), (B), (C)) The diaphragm 1 according to this first embodiment is a positive pressure diaphragm.

[0009] This diaphragm 1 is suitable for NBR, hydrin rubber, CR, SBR, EPDM, etc. The material is composed of a membrane part 2 and a bead part 3 formed on the periphery of the membrane part 2. (See Figure 1(A)).

0010 The bead portion 3 is connected to a plurality of case members 4 and 5 (in this embodiment, 2 Consists of individuals. ) is compressed on the inner wall surfaces 6a, 6b of the bead portion storage chamber 6 formed by The diaphragm chamber 7 is sealed (see FIG. 1(B)).

[0011] Inside the crimp portions 3a and 3b of the bead portion 3 with the inner wall surfaces 6a and 6b, there is a periphery. Side lip portions 8 and 9 are formed along the direction. The side lip parts 8 and 9 are , are pressed against the inner wall surfaces 6a and 6b under positive working fluid pressure to form a seal portion. (See FIG. 1(C)). Therefore, in bead part 3 Even if compressive deformation strain occurs and the degree of crimping of the crimping parts 3a and 3b decreases, the side lip The diaphragm chamber 7 is well sealed by the tap parts 8 and 9, and the membrane part 2 can operate properly. maintained.

0012 Note that the side lip portion may be provided only on one side, either the upper or lower side. Further, the material of the diaphragm 1 may be one containing a base cloth.

[0013] Second embodiment (Figure 2) The diaphragm 1 according to the second embodiment is a negative pressure diaphragm, and has a side lip. The portions 8 and 9 are formed outside the crimp portions 3a and 3b of the bead portion 3. So As a result, the side lips 8 and 9 receive negative working fluid pressure and close to the wall surface 6 of the bead housing chamber. a, 6b to form a seal, and the other configurations are as follows: This is the same as the first embodiment described above. Therefore, when compressive deformation strain occurs in the bead portion 3, , the diaphragm chamber 7 is sealed by the side lips 8 and 9 as in the first embodiment. properties are maintained, and good operation of the membrane portion 2 is maintained.

[0014] Third embodiment (Figure 3) The diaphragm 1 according to the third embodiment is a positive pressure diaphragm, and the bead portion 3 The cross-sectional shape is approximately rectangular, whereas the first embodiment is approximately circular. Main implementation In this example, the other configurations are the same as those in the first example, and the same effects can be achieved. Ru.

[0015] Fourth embodiment (Figure 4) The diaphragm 1 according to the fourth embodiment is a negative pressure diaphragm, and the diaphragm 1 according to the fourth embodiment is a negative pressure diaphragm. As in the example, the bead portion 3 has a rectangular cross-sectional shape. Other configurations are listed in the second section above. This is similar to the embodiment and produces the same effects.

[Brief explanation of drawings]

FIG. 1 shows the configuration of a diaphragm according to a first embodiment,
(A) is a sectional view, (B) is a usage diagram, and (C) is a usage diagram when compressive deformation strain occurs in the bead part.

[Fig. 2] Cross-sectional view of a diaphragm according to the second embodiment

[Fig. 3] Cross-sectional view of a diaphragm according to the third embodiment

[Fig. 4] Cross-sectional view of a diaphragm according to the fourth embodiment

[Fig. 5] Usage diagram of a diaphragm according to a conventional example

[Fig. 6] Diaphragm usage diagram according to another conventional example

[Explanation of symbols]

1 diaphragm 2 Membrane part 3 Bead part 6 Bead storage chamber 6a, 6b inner wall surface 8, 9 Side lip part

Claims (1)

[Scope of utility model registration request] 1. A diaphragm having a seal-forming bead portion formed on the periphery of the membrane portion, the bead portion being accommodated in a compressed state on the inner wall surface of the bead portion accommodating chamber; A side lip portion is formed in the bead portion along the circumferential direction, and the side lip portion is configured to be pressed against the inner wall surface to form a seal portion in response to fluid pressure acting on the diaphragm. diaphragm.