JPS604669A - Diaphragm device - Google Patents

Abstract

PURPOSE:To prevent disphragms from being reversed by partitioning two pressure chambers with at least two diaphragms and operating the diaphragms corresponding to a difference in pressure between the pressure chambers. CONSTITUTION:A disphragm device 1 comprises a metallic case 7 and a cover 5, wherein pressure chambers 8a, 8b are partitioned by two diaphragms 21, 22. Each diaphragm has the central part fixed to holders 3, 4 and the outer peripheral portion clamped between the case 7 and the cover 5. An air chamber 10 is formed between two diaphragms. When negative pressure is applied to one pressure chamber, as the pressure in the air chamber 10 is kept constant, one diaphragm is moved with the other diaphragm and displaced a little not being reversed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a diaphragm device. Conventionally, there has been a device of this type as shown in FIG. 1, which is used for pulp and the like. In Fig. 1, Ill is the main body of the diaphragm device, (2) is a diaphragm made of rubber-like elastic material, and (3) and +4) are located at approximately the same center of the diaphragm (2) and on both sides of the diaphragm (2). A holder (5) is located and holds the diaphragm (2), and indicates a metal cover, which together with the diaphragm (2) forms one pressure chamber (8a). (6) shows the cover (5), one body, and a pipe that leads pressure to the pressure chamber (8a).

(7) is connected to the other pressure chamber (
diaphragm (2).
] and the outer periphery of the cover, and hold each pressure chamber (8a
), (sb) ° Each outer peripheral edge is caulked and fixed to maintain airtightness. Next, the operation of this conventional device will be explained.

Now, one pressure chamber (8a) has negative pressure or positive pressure in the pipe (
6) Assuming that the other pressure chamber (8b) is maintained at a constant atmospheric pressure, the negative pressure introduced from the pipe (6) into one pressure chamber (8a) is first applied to the diaphragm (
2), the diaphragm (2) is pulled as shown by the solid line, and when positive pressure is applied to one pressure chamber (8a), the diaphragm (2) is pulled as shown by the broken line in FIG. (It has an inverted shape like two. These negative pressure and positive pressure displace the diaphragm (2) and displace the rond etc. which are integrated with the diaphragm (2) (not shown). , the diaphragm +21 is changed from the solid line to the dashed line (diaphragm (2) because it is inverted like two).
The displacement of the diaphragm '(2) is large, and the stress caused by the mechanical operation of the diaphragm '(2) causes early abrasion and damage to the diaphragm, resulting in an airtight leak.

This invention was made in order to eliminate the drawbacks of the conventional device as described above, and provides a diaphragm device in which the diaphragm constituting two pressure chambers is composed of at least two sheets, so that the diaphragm does not invert. The purpose is to

An embodiment of the present invention will be described below with reference to the drawings. ':
(S 2 E (21), (2'i5 is the pressure chamber (8a).

(8b) are separated by two diaphragms, each diaphragm has its central part fixed to the holder C31, +41, and its outer peripheral part fixed to the cover (5) and the case (7) K, The cover (5) side and the case (7)
) is installed so as to protrude to the side. [01 is the above 2
This shows an air chamber that is formed between two diaphragms (2++, (22) and confines air.This air chamber (10
) is the holder (3).

(4) and the outer peripheral edge of the diaphragm (21+, +22) to maintain airtightness.In this way, M
By forming 4 diaphragms (21), +22
For a displacement of 1, the result is 1, as shown in FIGS. 3 and 4. That is, when negative pressure is applied to one pressure chamber (8a), the third
The diaphragm moves in the -+51 direction from the broken line to the solid line in the figure. At this time, the diaphragm prisoner moves in the same direction without reversing. This is the air chamber (10).
Since the pressure is kept constant, the diaphragm (21)
attempts to change the pressure in the air chamber (10) by the displacement of the air chamber (10), but since it is airtight, the diaphragm (?2) is moved so that the diaphragm (22) is pulled up and the initial internal pressure is reached, and the diaphragm (?2) is moved to a state close to the initial set state. (The second group does not reverse and has a small displacement. Also, one pressure chamber (8a)
When positive pressure is applied to Diameter 7 Ramle I as shown in Figure 4.

The audience moves from the broken line toward case (7) as shown by the solid line.

At this time, the diaphragm (21) moves in the same direction without being reversed. This is similar to the above and acts to keep the pressure inside the air chamber (10) constant, so the diaphragm (2
The pressure received by the diaphragm (21) acts on the pressure in the air chamber (10) to move the diaphragm wing without causing the reversal phenomenon of 1). The pressure inside the air chamber (1 Oi is the pressure inside the diaphragm (21),
Unless it is resisted through H, reversal of the diaphragm body ++, +221 will not occur for both positive and negative pressures.

In the above description, the diaphragm is made up of two pieces, but of course it may be made up of three or more pieces.

In addition, in the case of three or more diaphragms, it is also possible to eliminate the need for the air chamber (lO)b Furthermore, in the above, two diaphragms (''
! + (Although an example is shown in which an air chamber 00 is provided between 2J, it is not limited to an air chamber, and other members such as a resin ring or the like may be used in place of the two diaphids 1).

(It may be inserted between the two positions.

As described above, in the present invention, in a device equipped with a diaphragm that isolates two pressure chambers and responds to the pressure difference between the pressure chambers, by configuring the diaphragm with at least two sheets, it is possible to prevent the diaphragm from inverting. This has the effect of providing a highly reliable device.

[Brief explanation of the drawing]

FIG. 1 is a partial sectional view showing a conventional diaphragm device, FIG. 2 is a partial sectional view showing a diaphragm device in an embodiment of the present invention, and FIGS. 3 and 4 are operation of the embodiment shown in FIG. It is a partial sectional view showing a state. In the figure, (1) is the main body, @X+, and (b) is the diaphragm, fs+. (4) is the holder, (6) is the cover, (7) is the case, (
8a). (8b) is a pressure chamber, and (tO) is an air chamber. Note that the same reference numerals in the figures indicate the same or equivalent parts. Agent Masuo Oiwa Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] A diaphragm device comprising a diaphragm that isolates two pressure chambers and responds to a pressure difference between the pressure chambers, characterized in that the diaphragm is comprised of at least two sheets.