JPH032768Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a diaphragm, and particularly to a diaphragm that can improve gas permeation resistance.

[Prior art and its problems]

In general, this type of diaphragm has gas permeability because it is made of an elastic material such as rubber, so gas permeability can be improved by increasing the crosslinking density through vulcanization etc. Although there are products that do this, they have the problem of reduced oil resistance.

In addition, there is also a diaphragm that uses a bellows made of metal foil instead of an elastic material such as rubber, and makes the diaphragm resistant to gas permeation due to the gas permeation resistance of the bellows such as metal foil, but this is expensive. It was very expensive and impractical.

Therefore, as shown in FIGS. 5 and 6, a diaphragm body 22 made of an elastic material such as rubber,
The diaphragm 21 is configured with a double structure with a sheet-like member 23 such as metal foil or resin film provided on the inside or outside of the diaphragm main body 22,
There is a diaphragm 21 that has gas permeability resistance due to the gas permeability resistance of the sheet-like member 23 such as metal foil or resin film. Since the elongation rate is extremely small compared to the diaphragm body 22 made of an elastic body, the elongation rate of the diaphragm body 22 is restricted, and as a result, the deformation range of the diaphragm 21 is restricted to a small range. It had

This device solves the problems of the conventional devices as described above, and not only improves gas permeation resistance, but also allows the deformation range to be almost the same as that of an elastic material such as rubber. It is an object of the present invention to provide a diaphragm that can be used to improve the durability of the diaphragm.

[Means for solving problems]

In order to solve the above problems, this idea
A diaphragm body made of an elastic material such as rubber has two
The diaphragm body 2 has a structure in which two gas permeation-resistant sheet-like members are disposed so as to be discontinuous at the portion where the amount of strain during deformation of the diaphragm body 2 is maximum.

[Effect]

This idea was developed by providing two gas permeation-resistant sheet-like members overlapping the diaphragm body, which is made of an elastic material such as rubber, at the part where the amount of strain during deformation is maximum, as described above. The gas permeability resistance can be improved, and since the two gas permeation resistance sheet-like members are not integrated, the deformation range can be made almost the same as that of a structure made of only an elastic material such as rubber. Moreover, the durability can be improved.

〔Example〕

Embodiments of this invention shown in the drawings will be described below.

Figure 1 shows the first diaphragm according to this invention.
An embodiment of the diaphragm 1 is shown.
The diaphragm body 2, which is an elastic body such as rubber, is formed into a bowl shape, and a gas-permeable sheet-like material such as aluminum metal foil is formed from the opening periphery of the diaphragm body 2 to the inner surface of the side part. The member 3 is attached to the outer surface of the bottom part via the diaphragm body 2, and a gas permeable sheet member 4 is attached by vulcanization bonding or the like so that the peripheral edge overlaps with the gas permeable sheet member 3. The sheet-like members 3 and 4, which are adhesively formed and have gas permeability resistance in the diaphragm body 2, are discontinuous;
In addition, the switching portion is the portion where the amount of distortion is maximum when the diaphragm main body 2 is deformed.

Therefore, when the diaphragm 1 is deformed, for example expanded, the elongation rate of the gas permeable sheet-like members 3 and 4 is small with respect to the diaphragm body 2 which is an elastic body, but the elongation rate of the diaphragm body 2 is small. During expansion, the gas permeation-resistant sheet-like members 3 and 4 are discontinuous and switched at the portion where the amount of strain is maximum, so that the elongation rate of the diaphragm body 2, that is, the elongation of the diaphragm 1 This does not affect the rate in any way.

FIG. 2 shows the state in which the diaphragm 1 as described above is used in an accumulator, and the annular hanging portion 7 of the upper casing 5 is placed in the space formed between the upper and lower casings 5 and 6. The diaphragm 1 according to this invention is installed in a covered state, and a gas chamber 8 is formed between the upper casing 5 and the diaphragm 1, and the inner surface of the lower casing 6 and the outer surface of the diaphragm 1 are in contact with each other. A plurality of holes 9 formed in the lower casing 6 are communicated with a fluid passage.

The gas chamber 8 is attached to the upper casing 5.
A gas inflow hole 10 communicating with the gas chamber 8 is provided, and gas at a predetermined pressure is kept sealed in the gas chamber 8 through the gas inflow hole 10.

On the other hand, pulsations from the fluid passage are absorbed by the diaphragm 1 deforming toward the gas chamber 8 side.

In this case, as described above, the diaphragm 1 is deformable in the same way as a diaphragm made of only an elastic material such as rubber, and in addition, the diaphragm 1 has sufficient durability due to the gas permeation-resistant sheet members 3 and 4. Since it has gas permeability, the pressure of the gas sealed in the gas chamber 8 is maintained constant over a long period of time. Since there is no need to increase the gas capacity in advance in anticipation of gas permeation, it is also possible to downsize the accumulator.

Figure 3 shows the second diaphragm according to this invention.
An embodiment is shown in which the same members as in the first embodiment are given the same numbers and detailed explanations are omitted.

This diaphragm 1 has a gas permeable sheet-like member 3 extending from the opening periphery of the diaphragm main body 2 to the outer surface of the side part, and a gas permeable sheet-like member 3 disposed on the inner surface of the bottom part through the diaphragm main body 2. The gas permeation-resistant sheet-like member 4 is adhered by vulcanization adhesive or the like so that the peripheral edge portion overlaps with 3. Similarly, gas permeation resistance can be improved, the deformation range can be made almost the same as that made of only elastic bodies such as rubber, and durability can also be improved. .

Figure 4 shows the third diaphragm according to this invention.
An embodiment is shown in which the same members as those described above are given the same numbers and detailed explanations are omitted.

This diaphragm 1 has a gas permeation-resistant sheet-like member 3 extending from the opening periphery of the diaphragm body 2 to the inner surface of the side part, and the peripheral edge overlaps with the gas-permeation-resistant sheet-like member 3 on the inner surface of the bottom part. death,
In addition, gas permeation-resistant sheet-like members 4 are bonded together using vulcanization adhesive or the like so that the peripheral edge portions can be slid. It has the same effect as that of .

In addition, in each of the above embodiments, the shape of the diaphragm is shown as a bowl shape, but the shape is not limited to this, and a cylindrical shape may also be used.
In short, if the diaphragm body is made of an elastic material such as rubber, two gas permeation-resistant sheet-like members are provided so that they are discontinuous at the part where the amount of strain during deformation is maximum. Of course, it can be anything.

[Effects of the invention] As mentioned above, this invention has two gas permeation-resistant parts in the diaphragm body made of an elastic material such as rubber, so that the diaphragm body is discontinuous at the part where the amount of strain during deformation is maximum. Since the structure is made up of sheets of elastic material, it is possible to achieve extremely high resistance to gas permeation, and it is also possible to obtain almost the same deformation range as compared to a structure made only of elastic materials such as rubber. Moreover, it has excellent effects such as improved durability due to the elasticity of the diaphragm body.

[Brief explanation of the drawing]

Fig. 1 is a schematic longitudinal sectional view showing a first embodiment of the diaphragm according to this invention, Fig. 2 is a view showing the diaphragm shown in Fig. 1 attached to an accumulator, and Fig. 3 is a diagram showing the second embodiment. A schematic vertical cross-sectional view showing
FIG. 4 is a schematic vertical sectional view showing the third embodiment;
FIG. 6 and FIG. 6 are schematic vertical sectional views showing a conventional device. DESCRIPTION OF SYMBOLS 1, 21... Diaphragm, 2, 22... Diaphragm main body, 3, 4... Gas permeation resistant sheet-like member, 5... Upper casing, 6... Lower casing, 7... Annular hanging part, 8... ...Gas chamber, 9...
Hole, 10... Gas inflow hole, 23... Sheet-like member.

Claims (1)

[Scope of claims for utility model registration] (1) Diaphragm body 2 made of an elastic material such as rubber
, two gas permeable sheet-like members 3, 4
A diaphragm, characterized in that the diaphragm body 2 is provided discontinuously at a portion where the amount of strain during deformation of the diaphragm body 2 is maximum. (2) The gas permeation-resistant sheet-like members 3 and 4 are
The diaphragm according to claim 1 of the utility model registration, which is formed of metal foil. (3) The gas permeation-resistant sheet-like members 3 and 4 are
The diaphragm according to claim 1, wherein the diaphragm is provided with edges facing each other on different surfaces of the diaphragm main body 2. (4) The gas permeation-resistant sheet-like members 3 and 4 are
The diaphragm according to claim 1, wherein the edges of the diaphragm body 2 overlap each other on the same surface of the diaphragm body 2.