JPH0417844Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to an accumulator, and in particular improves the gas permeability resistance of the bladder used to partition the interior, and also aims to extend this gas permeation resistance. This invention relates to an accumulator that can be maintained for a period of time.

[Prior art]

Generally, in the case of a spherical accumulator, the fourth
It is configured as shown in the figure.

That is, in FIG. 4, a substantially spherical shell 1 has an opening 1a at its lower part, and a port member 9 is attached to this opening 1a.

A fluid passage 9 is provided in the center of this port member 9.
A is formed, and this passage 9a is connected to a fluid flow path (not shown).

On the other hand, a hole 1b for gas filling is formed at the top of the shell 1, and an O-ring 1 is formed in this hole 1b.
1 is fitted.

Further, within the shell 1, a bladder 2 having a medium-high corrugated cross-sectional shape and having a poppet 5 fixed at the center on the side of the port member 9 is disposed, and this bladder 2 has the following features:
It is made of a rubber-like elastic material, and a metal foil 12 is embedded inside.

The peripheral edge of the bladder 2 has a cross section that is approximately inverted L.
An annular bladder holding member 6 having a shape of a letter is disposed, and when this bladder holding member 6 comes into contact with a stepped portion 1c provided on the inner wall surface of the shell 1, the bladder 2 held by the bladder holding member 6 is moved. It will be fixed within the shell 1.

In the conventional accumulator configured as described above, of the two chambers divided by the bladder 2, the upper chamber a is filled with a gas such as nitrogen gas through the hole 1b, The gas plug 10 provides a predetermined sealing pressure.

On the other hand, the lower chamber b is connected to a fluid flow path (not shown) through the passage 9a of the port member 9, and the fluid pressure in the flow path is lower than the sealing pressure of the chamber a, that is, the normal In this state, the pressure of the gas sealed in chamber a presses the bladder 2 toward the chamber b side, and as a result, the bladder 2 is pressed against the inner wall surface of the shell 1, and the port fixed to the center of the bladder 2 is pressed against the inner wall surface of the shell 1. The pet 5 is pressed against the opening of the passage 9a of the port member 9, closing the passage 9a.

Then, when the fluid pressure in the flow path becomes higher than the sealing pressure in the chamber a, the fluid flowing into the path 9a becomes
The bladder 2 is pushed upward against the sealing pressure of the chamber a, and the volume of the chamber b is expanded.

As a result, the chamber a is compressed, and the bladder 2 stops rising when the sealing pressure in the chamber a is balanced.

If an abnormal pressure rise occurs in the flow path due to the above operations, the accumulator configured as above absorbs the abnormal pressure rise and prevents damage to other devices installed in the flow path. is being carried out.

[Problem that the invention attempts to solve]

However, in the conventional accumulator constructed as described above, since the metal foil is embedded inside the bladder, the initial gas is Although the amount of permeation is less than 1/100, the tensile strength and tear strength of the metal foil itself are small, so cracks occur in the metal foil during operation, and these cracks grow as the operation continues. However, as a result, the area of only the rubber-like elastic material increases, and the amount of gas permeation increases.As a result, the gas permeation resistance decreases during operation, and it takes a very long time for the gas permeation resistance to decrease. The problem was that it was only for a short period of time.

This invention solves the problems of the conventional ones as mentioned above, and improves the gas permeation resistance of the bladder, prevents the pressure of the gas-filled chamber from decreasing over a long period of time, and makes it stable. The object of the present invention is to provide an accumulator that can perform controlled fluid control.

[Means for solving problems]

In order to solve the above problems, this idea provides a bladder inside the shell to divide the interior into two chambers, one of which is used as a pressure chamber to seal in gas, and the other chamber is used as a pressure chamber to fill in gas. In the acumulator which is the inflow side of the fluid in the passage, the bladder is provided with a metal foil laminated on one side with a laminate material made of resin or paper, and is provided on both sides of this metal foil, and is bonded between the metal foil and the metal foil. and a rubber-like elastic material that is not bonded to the laminate material, and a metal foil laminated with the laminate material is embedded inside the rubber-like elastic material. This is what I did.

[Effect]

By adopting the above-mentioned means, this idea
Since the metal foil provided inside the bladder is laminated with a laminate material made of resin or paper, the mechanical strength is higher than in the case of only metal foil. The gas permeability is improved compared to the case where the filter is provided, and the fluid can be controlled stably over a long period of time.

〔Example〕

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

FIG. 1 shows an accumulator according to this invention, and the same members as those in the conventional one are given the same numbers and detailed explanations will be omitted.

In the accumulator according to this invention, the bladder disposed inside the shell 1 is constructed as shown in FIG.

That is, the bladder 22 is made up of a metal foil 24 laminated with a laminate material 23 made of a thin resin film or paper on one side, and rubber-like elastic materials 25 and 26 located on both sides of the metal foil 24. Of the rubber-like elastic materials 25 and 26 located, the one 25 on the side that comes into contact with the metal foil 24 is bonded to the metal foil 24, and the metal foil 2
A laminate material 23 made of a thin resin film or paper laminated on one side of the laminate 4 and a rubber-like elastic material 26 in contact with the laminate material 23 can slide without adhesion.

Then, the bladder 22 configured as described above
is attached to the inside of the shell 1 via the bladder holding member 6 with the laminate material 23 made of a thin resin film or paper facing the chamber a, and the inside of the shell 1 is divided into two chambers a and b. It is divided.

Next, as mentioned above, when comparing the mechanical strength of a metal foil laminated with a thin resin film or paper laminate on one side and a metal foil alone, the tensile strength is , in the case of a single 10 μm aluminum foil as the metal foil, 5.02
Kg/mm ² , whereas when vinyl laminate material was coated on one side of 10 µm aluminum foil to a thickness of 5 µm, the amount was 6.44 Kg/mm ² .

Regarding tear strength, first of all, in the direction parallel to the surface, when using a single 7 μm aluminum foil as a metal foil, it is 2.3 g, whereas 22 g of thin paper on one side of a 7 μm aluminum foil is 2.3 g. When laminated, the weight is 19.5g, and in the direction perpendicular to the surface, when using a single 7μm aluminum foil as a metal foil, the weight is 2.3g, whereas on one side of a 7μm aluminum foil When 22g of tissue paper was laminated, the weight was 33.4g.

Therefore, as shown in the above comparison, aluminum foil laminated with resin or paper shows particularly superior tear strength compared to aluminum foil alone. Rubber-like elastic material is provided on both sides of foil laminated with resin or paper, and the aluminum foil and one rubber-like elastic material are bonded together, and the resin or paper is not bonded to the other side. and formed a bladder.

In the case of an accumulator using a bladder as described above, the occurrence of cracks and the growth of those cracks are reduced by operation due to the above-mentioned characteristics, and the initial gas permeation resistance is maintained for a long period of time. It is something that can be done.

FIG. 3 shows another embodiment of a bladder using this invention. In this case, a plurality of laminate materials 27 made of resin or paper are used, each having a fan shape. Material 2
7 are arranged so that both sides overlap with those on both sides, and a rubber-like elastic material is provided on both sides of such a product, and the aluminum foil and one rubber-like elastic material are bonded in the same way as in the above case. However, the aluminum foil laminated with the laminate material is placed inside the rubber-like elastic material without adhesion between the laminate material made of resin or paper and the other rubber-like elastic material.

With this configuration, it is possible to further suppress the occurrence of cracks during operation and the growth of the cracks.

[Effect of idea]

By configuring this idea as described above,
This has excellent effects such as increased strength of the bladder and improved gas permeability, which allows for stable use over a long period of time.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing the accumulator according to this invention, Fig. 2 is an enlarged schematic diagram of the main parts, Fig. 3 is a schematic diagram showing another example of the laminate material installed inside the bladder, and Fig. 4 is the conventional one. It is a schematic diagram showing an accumulator. 1... Shell, 1a... Opening, 1b... Hole, 1c... Stepped part, 2, 22... Bladder, 5...
...Poppet, 6... Bladder holding member, 9... Port member, 9a... Passage, 10... Gas plug, 1
1... O ring, 12, 24... Metal foil, a, b
... Chamber, 23, 27 ... Laminate material, 25, 2
6...Rubber-like elastic material.

Claims (1)

[Scope of utility model registration request] A bladder 22 is disposed inside the shell 1, and the interior is
In an accumulator which is divided into chambers a and b, one chamber a is a pressure chamber for sealing gas, and the other chamber b is an inflow side of fluid in a flow path, and the bladder 22 is made of resin or paper. Metal foil 24 laminated on one side with a laminate material 23
and rubber-like elastic materials 25 and 26 provided on both sides of the metal foil 24 and bonded to the metal foil 24 and not bonded to the laminate material 23, Rubber-like elastic material 2
5. An accumulator characterized in that a metal foil 24 laminated with a laminate material 23 is built into the inside of the laminates 5 and 26.