JPH03181601A - Bladder for accumulator - Google Patents

Abstract

PURPOSE:To avoid crack, separation of contact joint, and leakage of liquid or gas in a gas shielding layer, by exposing the end face of fringe part of a gas shielding layer at the end face of fringe part of an elastic material layer, and jointing the end face of a back-up ring to the end face of the fringe part of the elastic material layer. CONSTITUTION:A bladder main body 10A is composed of an elastic material layer 11 such as rubber and a gas shielding layer 12 arranged on the inner circumferential face of the layer 11 by contact jointing or inserting. An elastic fitting part 11a of elastic material such as rubber is provided on the inner circumferential face of fringe part of the gas shielding layer 12, and an elastic fitting part 11b is provided on the fringe part of the elastic material layer 11. A back-up ring 10B of teflon or the like is jointed to the end face of the fringe part of the elastic material layer 11 to insure sealing property and prevent dislocation of the fringe part of the bladder main body 10A, accompanied with expansion or contraction of the elastic material layer 11. Consequently, crack of the gas shielding layer, generation of separation of contact joint, and leakage of liquid or gas can be avoided, and variation of gas pressure with the lapse of time can be restrained.

Description

Detailed Description of the Invention (1) Object of the Invention [Field of Industrial Application] The present invention relates to a bladder for an accumulator, and in particular to a bladder for an accumulator, in which the peripheral edge of an elastic material layer and the peripheral edge of a gas shielding layer are formed and then elastically attached. The inner peripheral surface of the elastic material layer or the peripheral end surface of the gas shielding layer disposed inside the elastic material layer is A bladder for an accumulator which is exposed at the peripheral end face of the material layer and has an end face of a backup ring joined to at least the peripheral end face of the elastic material layer among the peripheral end face of the elastic material layer and the peripheral end face of the gas shielding layer. It is related to.

[Prior Art] Conventionally, this type of accumulator bladder, such as an accumulator bladder 30 shown in FIG. The inner circumferential surface of the elastic material layer 31 is cut along a cut surface that coincides with the end surface of the attachment portion 31a or a cut surface that intersects with the end surface of the elastic attachment portion 31a (indicated by broken line XX in FIG. 7). Alternatively, it has been proposed that the peripheral end face of the gas shielding layer 32 disposed inside is exposed at the peripheral end face of the elastic material layer 31.

[Problems to be Solved] However, in the conventional accumulator bladder 30, the peripheral end face of the gas shielding layer 32 was exposed at the peripheral end face of the elastic material layer 31, so (1) the gas chamber 41
When the gas in A enters the inside of the elastic material layer 31 or the inside of the elastic attachment part 31a, it moves along the gas chamber 41A side surface of the gas shielding layer 32 as shown by the broken line arrow in FIG. It reaches the end face of the peripheral edge of the layer 31, goes around the surface on the liquid chamber 41B side as indicated by the broken line arrow in FIG. 8 through the contact surface with the fixing member, and enters the inside of the elastic material layer 31 on the liquid chamber 41B side. As a result, gas flows into gas chamber 4.
1A to the liquid chamber 41B, and (11) the liquid chamber 41B passes through the contact surface between the elastic material layer 31 and the shell to the peripheral end face of the elastic material layer 31 and the peripheral edge of the gas shielding layer 32. After reaching the end surface of the elastic material layer 31, the liquid accumulates in the space between the peripheral end surface of the elastic material layer 31 and the peripheral edge of the gas shielding layer 32 and the fixing member, enters the gas shielding layer 32, and deteriorates and alters the gas shielding layer 32. Furthermore, there is a drawback that the gas pressure in the gas chamber 41A changes over time, and also fiii) the peripheral edge of the elastic material layer 31 moves from the fixed position by the fixing member as it expands and contracts. It also had the disadvantage of causing positional deviation.

Therefore, in order to eliminate these drawbacks, the present invention aims to form the peripheral edge of the elastic material layer and the gas shielding layer, and then form a cut surface that coincides with the end surface of the elastic mounting part or crosses the end face of the elastic mounting part. By cutting along the cut plane, the peripheral end face of the gas shielding layer is exposed at the end face of the elastic material layer, and at least the peripheral end face of the elastic material layer is exposed at the peripheral end face of the elastic material layer and the peripheral end face of the gas shielding layer. It is an object of the present invention to provide an accumulator bladder in which an end face of a backup ring is joined to an end face of a back-up ring.

(2) Structure of the invention [Means for solving the problems] The means for solving the problems provided by the present invention is as follows: ``A gas shielding layer is disposed on the inner peripheral surface or inside of the elastic material layer, and the elastic material layer Alternatively, an elastic attachment part is formed on the inner circumferential surface of the peripheral edge of the gas shielding layer. In the accumulator bladder where the attachment part is pressed, after forming the peripheral edge of the elastic material layer (11+ and the peripheral edge of the gas shielding layer (12)), the elastic attachment part (a cut surface that coincides with the end surface of the llaj or the elastic attachment part ( The elastic material layer (11) is cut by cutting along the cutting plane that intersects the end surface of the flat.
The peripheral end face of the gas shielding layer (12) is exposed to the peripheral end face of the elastic material layer (11), and at least the peripheral end face of the elastic material layer (11) and the peripheral end face of the gas shielding layer (12) are exposed. ) is characterized in that the end face of a backup ring (10B) is joined to the peripheral end face of the accumulator bladder.

[For use] The accumulator bladder according to the present invention has a gas em layer disposed on the inner peripheral surface or inside of the elastic material layer, and an elastic layer on the inner peripheral surface of the elastic material layer or the gas shielding layer. A bladder for an accumulator, the elastic mounting portion being pressed by a fixing member in order to bring the outer circumferential surface of the peripheral edge of the elastic material layer into contact with the inner circumferential surface of the shell of the accumulator. In particular, by forming the peripheral edge of the elastic material layer and the peripheral edge of the gas shielding layer and cutting it along a cut surface that coincides with the end surface of the elastic attachment part or a cut plane that intersects with the end surface of the elastic attachment part, the elastic material is Gas against the edge of the layer: i! The peripheral end face of the covering layer is exposed, and the peripheral end face of the elastic material layer and the gas are exposed. ! Since the end face of the backup ring is joined to at least the peripheral end face of the elastic material layer among the peripheral end faces of the shielding layer, the shielding layer does not buckle and crack at its peripheral edge during use. Also, even if the gas moves along the gas chamber side surface of the fiil gas shielding layer to the peripheral edge end surface, it will go around to the liquid chamber side surface and pass through the elastic material layer. It has the effect of preventing the liquid from permeating into the liquid chamber, and also has the effect of preventing the liquid from entering and deteriorating the MiI layer. In addition, (v) it acts to prevent the peripheral edge of the elastic material layer from shifting from its fixed position due to expansion and contraction operations.

[Example 1] Next, the bladder for an accumulator according to the present invention will be specifically described with reference to a preferred example thereof. However, the examples described below are described to facilitate or accelerate the understanding of the present invention, and are not described to limit the present invention. In other words, each element disclosed in the embodiments described below includes all design changes and equivalent substitutions that fall within the spirit and technical scope of the present invention.

FIG. 1 is a cross-sectional view showing one embodiment of an accumulator bladder according to the present invention.

FIG. 2 is a partially enlarged sectional view showing a part of the embodiment shown in FIG. 1 in an enlarged manner.

FIG. 3 is a sectional view showing the embodiment of FIG. 1 in an exploded manner.

FIG. 4 is a partial sectional view showing how the embodiment shown in FIG. 1 is used.

FIG. 5 fat to fcl are partially enlarged sectional views showing the manufacturing procedure of the embodiment shown in FIG.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, the structure of an embodiment of an accumulator bladder according to the present invention will be described in detail with reference to FIGS. 1 to 5(a) to fc).

The Ugami Agemi lO is a bladder for an accumulator according to the present invention, which fills a space between a bladder body 10A and a fixing member 22, which will be described later, and which is joined to the peripheral end surface of the bladder body 10A. It also includes a backup ring IOB for preventing displacement of the peripheral edge of the bladder body 10A.

The 22m patch grader main body 10A is made of an elastic material layer 11 made of an elastic material such as rubber, and is attached to the inner circumferential surface (this case will mainly be explained below) or the inside of the elastic material layer 11 by simply inserting it, rather than adhering it to the inside. The elastic material layer 11 includes a gas shielding layer 12 and a poppet 13 disposed at the center of the outer peripheral surface of the elastic material layer 11.

When the gas shielding layer 12 is disposed on the inner circumferential surface of the elastic material layer 11, when the fixing member 22 is attached to the inner circumferential surface of the shell 21, which will be described later, to the inner circumferential surface of the peripheral edge of the gas shielding layer 12. In order to ensure a seal, a thick elastic attachment portion 11a made of an elastic material such as rubber is formed.

On the other hand, when the gas shielding layer 12 is disposed inside the elastic material layer 11, the fixing member 22 is attached to the inner peripheral surface of the peripheral edge of the elastic material layer 11 and to the inner peripheral surface of the shell 21, which will be described later.
A thick elastic attachment portion 11a made of an elastic material such as rubber is formed in order to ensure a seal when attached.

Furthermore, a protrusion 11b is formed on the outer peripheral surface of the elastic material layer 11 to ensure a sufficient seal when attached to the shell 21, which will be described later.

The gas shielding layer 12 is made of a resin film or metal foil with low gas permeability, such as polyvinyl alcohol, polyvinyl fluoride, or vinylidene chloride, on at least one surface of a reinforcing material 12a such as woven fabric (for example, knitted fabric) or nonwoven fabric. It is formed by disposing a shielding film 12b, and the reinforcing material 12a and the gas shielding film 12
It contains at least one layer of b.

Backup Ring IOB The backup ring IOB is made of a suitable material such as Teflon resin, and preferably does not have elasticity.

The backup ring IOB is connected to the peripheral end face of the elastic material layer 11 included in the bladder main body 10A and the gas shielding film 12.
The bladder body 10 has the function of filling the cutout portion (i.e., the space between the peripheral end face and the fixing member 22) of the bladder body 10.
This function is to prevent displacement of the peripheral edge of the bladder body 10A due to expansion and contraction of the elastic material layer 11 included in the bladder body 10A.

Accumulator 20 20 is an accumulator, and the internal space of the shell 21 is divided into a gas chamber 21A and a liquid chamber 21B by an accumulator bladder 1O according to the present invention.

That is, the accumulator bladder 10 according to the present invention
is the outer peripheral surface thereof (i.e., the outer peripheral surface of the bladder main body 10A and the outer peripheral surface of the backup ring 10B)
is arranged so as to be in contact with the inner circumferential surface of the shell 21, and then the elastic attachment part 11a of the bladder body 10A and the inner circumferential surface of the backup ring 10B are pressed toward the inner circumferential surface of the shell 21 by the fixing member 22. As a result, it is fixed to the inner circumferential surface of the shell 21.

At this time, the accumulator bladder lO according to the present invention
The protrusion 11b of the bladder body 10A is brought into elastic contact with the inner peripheral surface of the shell 21, and the outer peripheral surface of the backup ring 10B is brought into contact with the inner peripheral surface of the shell 21.

The gas chamber 21A of the shell 21 is filled with an appropriate gas (for example, nitrogen gas) supplied from the gas supply port 23a by closing the gas supply port 23a with the closing member 23.

In addition, a communication port 24 of a communication member 24 whose inner opening can be closed by a poppet 13 is provided in the liquid chamber 21B of the shell 21.
A suitable liquid supply source (not shown) is connected through A, and liquid is supplied according to the pressure of the liquid supply source.

Further, with reference to FIGS. 1 to 5(a) to (cl), the manufacturing procedure for an embodiment of the accumulator bladder according to the present invention will be explained in detail.

The elastic material layer 11 and the gas shielding layer 12 are the elastic material layer 1
1. When the elastic holding part 11a and the gas shielding layer 12 are laminated and molded, the peripheral edge thereof is formed so as to extend to a position beyond the peripheral edge end face of the elastic attachment part 11a (see FIG. 5 fa)). At this time, it is preferable that the elastic material layer 11 and the gas shielding layer 12 have their peripheral edge end faces directed toward the outer circumferential direction, since this can suppress the generation of wrinkles or folds.

Next, the elastic material layer 11 and the gas shielding layer 12 are inclined (preferably is inclined by an angle of less than 45 degrees) and cut along intersecting cutting planes.
(see Figure 5 fat fb and Figure 3).

Thereafter, the end face of a separately prepared backup ring IOB is bonded to the peripheral end face of the elastic material layer 11 and the gas shielding layer 12 with an appropriate adhesive (see Fig. 5 (cl) and Fig. 3). ).

As a result, the accumulator bladder l according to the present invention
O is such that the end surface of the backup ring 10B is joined to the peripheral end surface of the bladder body 10A in which the peripheral end surface of the gas shielding layer 12 extends to the peripheral end surface of the elastic material layer 11 (see FIG. 1). reference).

The accumulator bladder lO according to the present invention is fixed to the inner circumferential surface of the shell 21 by the fixing member 22, and then used to absorb pressure fluctuations of the night body supply source.

In addition, the operation of an embodiment of the bladder for an accumulator according to the present invention will be explained in detail with reference to FIGS. 1 to 5(a) to fcl.

When the accumulator bladder 10 according to the present invention is attached to the shell 21 by the fixing member 22, the peripheral end face of the bladder body 10A (that is, the peripheral end face of the elastic material layer 11 and the peripheral end face of the gas shielding layer 12) is Since it is joined to the end surface of the backup ring IOH, the space (i.e., gap) existing between the peripheral end surface of the bladder body 10A and the fixing member 22 is filled, and the bladder body 10A is bonded to the inner peripheral surface of the shell 21. This will lock the end face of the peripheral edge to prevent its position from shifting.

Therefore, the accumulator bladder 1 according to the present invention
0, even if gas that has entered from the gas chamber 21A into the inside of the elastic material layer 11 on the side of the gas chamber 21A or into the inside of the elastic attachment part 11a moves along the surface of the gas shielding layer 12 to the peripheral end surface, the liquid chamber is The liquid chamber 21 goes around to the 21B side surface.
It is possible to prevent the liquid from permeating into the liquid chamber 21B through the elastic material layer 11 on the B side, and also to prevent the liquid from reaching the end surface of the gas shielding film 12 along the elastic material layer 11 from the liquid chamber 21B, causing deterioration and alteration. can be prevented.

Furthermore, the accumulator bladder 10 according to the present invention
This can prevent the gas pressure in the gas chamber 21A from changing over time.

Further, the accumulator bladder lO according to the present invention is
Since the peripheral edge of the gas shielding layer 12 is removed by cutting after molding during manufacturing, wrinkles or folds that occur on the peripheral edge during molding can be removed, and the gas shielding layer 12 will not buckle at the peripheral edge during use. This causes the reinforcing material 12a or the gas 3J! ! It is possible to avoid cracks or adhesive peeling in the covering film 12b.

(3) Effects of the Invention As is clear from the above description, the accumulator bladder according to the present invention has a gas shielding layer disposed on the inner peripheral surface or inside of the elastic material layer, and An elastic attachment part is formed on the inner circumferential surface of the peripheral edge, and the elastic attachment part is pressed by the fixing member in order to bring the outer circumferential surface of the circumferential edge of the elastic material layer into contact with the inner circumferential surface of the shell of the accumulator. In particular, the peripheral edge of the elastic material layer and the peripheral edge of the gas shielding layer are formed into a cut surface that coincides with the end surface of the elastic mounting section or a cut surface that intersects with the end surface of the elastic mounting section. By cutting along the length, the peripheral edge end surface of the gas shielding layer is exposed to the peripheral edge end surface of the elastic material layer, and at least six of the peripheral edge end surface of the elastic material layer and the peripheral edge end surface of the gas shielding layer are Since the end face of the backup ring is bonded to the peripheral end face of the back-up ring, (i) it has the effect of preventing the gas shielding layer from buckling at its peripheral part during use, thereby preventing cracks or adhesive peeling; In addition, even if the gas moves along the gas chamber side surface of the fiil gas shielding layer to the end surface of the peripheral edge thereof, it has the effect of being able to prevent the gas from going around to the liquid chamber side surface and permeating into the liquid chamber via the elastic material layer. In addition, it has the effect of preventing the gas shielding layer from deteriorating due to the intrusion of the fIII liquid, and has the effect of suppressing the change in the gas pressure in the gas chamber over time. (This has the effect of preventing the peripheral edge of the V1 elastic material layer from shifting from its fixed position due to expansion and contraction operations.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing one embodiment of the bladder for an accumulator according to the present invention, FIG. 2 is a partially enlarged cross-sectional view showing a part of the embodiment shown in FIG. 1, and FIG. Fig. 1 is a sectional view showing the exploded embodiment; Fig. 4 is a partial sectional view showing how to use the embodiment shown in Fig. 1; Fig. 5(a)
~fcl is a partially enlarged sectional view to show the manufacturing procedure of the embodiment shown in FIG. 1, FIG. 6 is a partially enlarged sectional view to show the conventional example, and FIG. 7 is a partially enlarged sectional view to show the manufacturing procedure of the conventional example shown in FIG. 6. FIG. 8 is a partially enlarged sectional view showing the operation of the conventional example shown in FIG. lO... 0A 11... Accumulator bladder... Bladder body... Elastic material layer... Elastic mounting part... Protrusion Part... Gas shielding layer... Reinforcement material... Resin membrane... Poppet Back up ring... Accumulator... Shell Gas chamber Liquid chamber fixing member Closing member Gas supply port connection Parts/connection port 12b... 13... 10B 20... 21... 21A・・・・ 21B ・・・・ ・・・・ 22・・・・ ・ ・ ・ 23・・・・・・・・・・・ 23a ・・・・・・・・・ 24...・・・・・・・・・ 24a ・・・・・・・・・

Claims (1)

[Claims] A gas shielding layer is arranged on the inner peripheral surface or inside of the elastic material layer, and an elastic attachment part is formed on the peripheral inner peripheral surface of the elastic material layer or the gas shielding layer, and the inner peripheral surface of the shell of the accumulator is In the bladder for an accumulator, the elastic mounting portion is pressed by a fixing member in order to attach the outer peripheral surface of the peripheral edge of the elastic material layer to the outer peripheral surface of the elastic material layer (11) and the gas shielding layer (12). After molding, the peripheral edge of the elastic material layer (
The peripheral end surface of the gas shielding layer (12) is exposed to the peripheral end surface of the gas shielding layer (11), and at least the elastic material layer of the peripheral end surface of the elastic material layer (11) and the peripheral end surface of the gas shielding layer (12) is exposed. A bladder for an accumulator, characterized in that the end face of a backup ring (10B) is joined to the peripheral end face of (11).