WO2017141718A1

WO2017141718A1 - Accumulator

Info

Publication number: WO2017141718A1
Application number: PCT/JP2017/003819
Authority: WO
Inventors: 真也上村; 克実松井
Original assignee: イーグル工業株式会社
Priority date: 2016-02-15
Filing date: 2017-02-02
Publication date: 2017-08-24
Also published as: JPWO2017141718A1; EP3418583B1; JP6860546B2; EP3418583A1; EP3418583A4

Abstract

Provided is an accumulator having excellent sealability at the joint between bladders. Disclosed is an accumulator 10 in which the interior space of a shell 20 is partitioned into a gas chamber G and a liquid chamber R by arranging bladders 30 on the inner side of the shell 20, the accumulator comprising: an outer-diameter-side bladder 31 having a circumferential edge part 31a arranged on the inner circumferential part 20b of the shell 20; an inner-diameter-side bladder 32 having a circumferential edge part 32a arranged on the inner side of the outer-diameter-side bladder 31 and formed so as to project toward the inner diameter side; and a holder 40 that holds the circumferential edge part 31a of the outer-diameter-side bladder 31 and the circumferential edge part 32a of the inner-diameter-side bladder 32 from the inner diameter side so as to oppose the inner circumferential part 20b of the shell 20. The circumferential edge part 31a of the outer-diameter-side bladder 31 includes an outer-side annular projection 31g on the outer diameter side thereof. The circumferential edge part 32a of the inner-diameter-side bladder 32 includes, on the inner diameter side thereof, an inner-side annular projection 32h that abuts against the holder 40.

Description

accumulator

The present invention relates to an accumulator in which a bladder is disposed inside a shell to divide the internal space of the shell into a gas chamber and a liquid chamber.

Conventionally, there is a bladder type accumulator in which an inner peripheral surface of a shell is closely attached to the inner peripheral surface of the shell to divide the inner space of the shell into a gas chamber and a liquid chamber. In order to ensure the sealing performance of the bladder that divides the gas chamber and the liquid chamber, a material having good gas shielding properties is used as the material of the bladder disposed on the gas side, and the bladder is disposed on the liquid chamber side. As a bladder material, an accumulator having a bladder structure composed of two materials using a material having good liquid resistance has been proposed. (For example, patent document 1).

Japanese Utility Model Publication No. 2-128801 (FIG. 1)

However, in Patent Document 1, the shielding material (inner diameter side bladder) and the liquid-resistant material (outer diameter side bladder) cannot be brought into close contact with each other at the periphery of the two-material bladder. Enters between the gas shielding material and the liquid-resistant material from the joint between the gas shielding material and the liquid-resistant material, and the invaded gas passes through the liquid-resistant material having a low shielding property against the gas, There is a problem that it leaks into the liquid chamber or stays between the gas shielding material and the liquid-resistant material, thereby impairing the function as an accumulator.

The present invention has been made paying attention to such problems, and an object of the present invention is to provide an accumulator excellent in the sealing performance of the joints between the bladders.

In order to solve the above problems, an accumulator according to the present invention comprises:
An accumulator for arranging a bladder inside the shell and partitioning the inner space of the shell into a gas chamber and a liquid chamber,
An outer diameter side bladder, the peripheral part of which is disposed on the inner peripheral part of the shell;
An inner diameter side bladder in which a peripheral edge formed to protrude to the inner diameter side is disposed inside the outer diameter side bladder;
A holder for holding a peripheral edge of the outer diameter side bladder and a peripheral edge of the inner diameter side bladder facing the inner peripheral part of the shell from the inner diameter side;
The peripheral portion of the outer diameter side bladder includes an outer annular protrusion on the outer diameter side, and the peripheral portion of the inner diameter side bladder includes an inner annular protrusion that contacts the holder on the inner diameter side. It is a feature.
According to this feature, the inner ring-shaped protrusion at the peripheral edge of the inner diameter side bladder and the outer ring-shaped protrusion at the peripheral edge of the outer diameter side bladder are compressed in the radial direction by the radial compression force of the holder, ensuring a large fastening allowance. As a result, the sealing property of the joint between the bladders can be improved.

The inner diameter side bladder is made of a material having a low gas permeability, the outer diameter side bladder is made of a material having liquid resistance, a gas chamber is disposed on the inner diameter side of the bladder, and the outer diameter side of the bladder is A liquid chamber is arranged.
According to this feature, a bladder made of a material having a low gas permeability on the gas chamber side (a material having a lower gas permeability than the liquid chamber side and hardly deteriorates) is disposed, and the material having liquid resistance on the liquid chamber side. By using (a material that does not easily deteriorate or swell due to liquid), a gas that does not permeate and a bladder that does not deteriorate due to the liquid is achieved, and each fluid does not leak into the other fluid chamber by each bladder. It can be a structure.

The peripheral edge portion of the inner diameter side bladder further includes an outer annular protrusion on the outer diameter side thereof.
According to this feature, it is possible to prevent gas leakage by providing an inner annular protrusion and an outer annular protrusion for a gas having small fluid particles, and to the liquid chamber or between two bladders. Gas can be prevented from entering.

The inner annular protrusion of the inner diameter side bladder is provided at a position facing the outer annular protrusion of the outer diameter side bladder or the outer annular protrusion of the inner diameter side bladder.
According to this feature, the inner annular protrusion of the inner diameter side bladder and the outer annular protrusion of the outer diameter side bladder or the outer annular protrusion of the inner diameter side bladder can be pressed against each other to ensure a large tightening margin, Sealability between the bladders and between the bladders can be ensured.

The peripheral portion of the outer diameter side bladder is characterized by being nested by the peripheral portion of the inner diameter side bladder.
According to this feature, since the peripheral portion of the outer diameter side bladder is nested by the peripheral portion of the inner diameter side bladder, the sealability between the outer diameter side bladder and the inner diameter side bladder can be ensured.

The peripheral portion of the outer diameter side bladder further includes an inner annular protrusion on the inner diameter side thereof.
According to this feature, the outer circumferential side of the outer diameter side bladder can secure a larger tightening margin by the outer annular projection of the inner diameter side bladder, and the sealing performance between the outer diameter side bladder and the inner diameter side bladder can be secured. .

It is a partial sectional side view of the accumulator in Example 1. FIG. (A) is a figure which shows the peripheral part of an outer diameter side bladder and an inner diameter side bladder, (b) is the A section enlarged view of FIG. It is a partial sectional side view of the accumulator in Example 2. FIG. (A) is a figure which shows the peripheral part of an outer diameter side bladder and an inner diameter side bladder, (b) is the B section enlarged view of FIG.

A mode for carrying out an accumulator according to the present invention will be described below based on an embodiment.

The accumulator according to the first embodiment will be described with reference to FIGS. First, reference numeral 10 in FIG. 1 denotes an accumulator to which the present invention is applied. As shown in FIG. 1, the accumulator 10 includes a shell 20, a bladder 30 that is disposed on an inner peripheral portion 20 b of the shell 20, and divides the internal space of the shell 20 into a gas chamber G and a liquid chamber R, and a bladder And a holder 40 that holds the peripheral edge portion 30a of the 30 facing the shell 20 from the inner diameter side.

As shown in FIG. 1, the shell 20 is made of metal, and

hemispherical portions

21 and 22 are formed so as to have a stepped portion with which a holder 40 described later is engaged, and a spherical shape having a substantially spherical vacancy therein. It is formed as a body. An opening 21a is formed at the bottom of the hemispherical portion 21, and a liquid port 23 is fixed to the opening 21a by welding. On the other hand, a gas plug 24 is detachably disposed at the bottom of the hemispherical portion 22 facing the opening 21a.

The bladder 30 is a flexible film-like body, and is disposed on the inner diameter side of the outer diameter side bladder 31 and the outer diameter side bladder 31 that are arranged in a natural state so as to face the inner peripheral portion 20 b of the shell 20. The outer diameter side bladder 31 is made of a two-layer structure comprising an inner diameter side bladder 32. The outer diameter side bladder 31 is a liquid-resistant material such as a rubber or a resin film having a high sealing property that is not easily deteriorated by the liquid even when it comes into contact with the liquid. Consists of. Further, the inner diameter side bladder 32 is made of a gas shielding material such as a rubber or a resin film having a high shielding property which does not easily deteriorate even when in contact with a gas such as nitrogen and does not transmit gas. The peripheral portion 30a of the bladder 30 is composed of a peripheral portion 31a of the outer diameter side bladder 31 and a peripheral portion 32a of the inner diameter side bladder 32. The peripheral portion 31a and the peripheral portion 32a are in contact with the inner peripheral portion 20b of the shell 20, respectively. In contact therewith, the internal space of the shell 20 is partitioned in a sealed manner into a gas chamber G filled with gas and a liquid chamber R filled with a liquid such as oil.

As shown in FIG. 1 and FIG. 2 (a), the outer diameter side bladder 31 has an annular peripheral portion 31a that is substantially rectangular in cross section and protrudes toward the inner diameter side and is formed thick, and an annular peripheral portion 31a. It comprises a film body portion 31f extending in a bowl shape from the lower end portion 31e over the entire circumference. The outer peripheral portion 31b of the peripheral edge portion 31a is formed with an annular protrusion 31g that protrudes radially outward from the outer peripheral portion 31b over the entire periphery, and the annular protrusion 31g contacts the inner peripheral portion 20b of the shell 20. Touch and seal the liquid.

The inner diameter side bladder 32 includes an annular peripheral portion 32a formed in a substantially U-shaped cross section, and a film body portion 32f extending in a bowl shape from the lower end portion 32e of the annular peripheral portion 32a over the entire circumference. Become. The peripheral edge 32a includes an upper end 32c that covers the entire upper end 31c of the peripheral edge 31a of the outer diameter side bladder 31, and an inner peripheral 32d that covers the entire inner periphery 31d of the peripheral edge 31a. And a lower end 32e that covers the lower end 31e of the peripheral edge 31a over the entire circumference. A peripheral portion 32a having a substantially U-shaped cross section of the inner diameter side bladder 32 is disposed so as to be nested from the inner peripheral side of the peripheral portion 31a of the outer diameter side bladder 31 having a substantially rectangular cross section. Further, an annular protrusion 32g is formed on the outer peripheral portion of the upper end portion 32c of the peripheral edge portion 32a of the inner diameter side bladder 32 and formed radially outward along the entire periphery of the upper end portion 32c. The portion 32g contacts the inner peripheral portion 20b of the shell 20 to seal the gas. Further, an annular protrusion 32h that protrudes radially inward from the inner peripheral part 32d is formed on the inner peripheral part 32d of the peripheral edge part 32a of the inner diameter side bladder 32, and the annular protrusion 32h. Is pressed and held by the inner peripheral portion 20b of the shell 20 and a holder 40, which will be described later, so that the peripheral portion 31a of the outer diameter side bladder 31 and the peripheral portion 32a of the inner diameter side bladder 32 are compressed in the radial direction, resulting in large tightening. The cost can be secured and the sealing performance can be improved.

Further, as shown in FIGS. 1 and 2B, a holder 40 that presses and holds from the inner diameter side of the peripheral portion 30 a toward the inner peripheral portion 20 b of the shell 20 is arranged on the peripheral portion 30 a of the bladder 30. Established. The holder 40 is formed in a substantially L-shaped cross section, and includes an annular flange portion 40a extending in the radial direction and an annular extending portion 40b extending in the axial direction from the inner diameter portion of the flange portion 40a. The extended portion 40b of the holder 40 is formed to have a larger diameter than the inner peripheral portion 32d (see FIG. 2A) of the peripheral portion 30a of the bladder 30, and the holder 40 is connected to the inner peripheral portion of the peripheral portion 30a of the bladder 30. When the holder 40 is further fitted to the inner peripheral portion 20b of the shell 20, the peripheral portion 30a of the bladder 30 is compressed between the holder 40 and the inner peripheral portion 20b of the shell 20. At this time, the annular protrusion 31g of the peripheral edge portion 31a of the outer diameter side bladder 31 and the annular protrusion 32g of the peripheral edge portion 32a of the inner diameter side bladder 32 are further compressed in the radial direction, ensuring a large fastening allowance and improving the sealing performance. be able to.

The annular protrusion 31g of the outer diameter side bladder 31 tightly adheres to the inner peripheral portion 20b of the shell 20 to seal the liquid, and the annular protrusion 32h of the inner diameter side bladder 32 also closely adheres to the inner peripheral portion 20b of the shell 20. Thus, the gas and the gas are sealed, so that the liquid and the gas can be kept sealed without entering between the annular protrusion 31g and the annular protrusion 32g.

Further, since the inner peripheral portion of the peripheral edge portion 30 a of the bladder 30, that is, the inner peripheral portion 30 d of the inner diameter side bladder 32, is further provided with an annular protrusion 32 h, the annular protrusion 32 h is connected to the inner periphery 20 b of the holder 40 and the shell 20. , An even greater compressive force is generated at the peripheral edge 30a of the bladder 30, and the annular protrusion 31g of the outer diameter side bladder 31 and the annular protrusion 32g of the inner diameter side bladder 32 become the inner periphery of the shell 20. Further tighter contact with the portion 20b can further improve the sealing performance. At this time, by forming the annular protrusion 31g of the peripheral edge portion 31a of the outer diameter side bladder 31 and the annular protrusion 32h of the peripheral edge portion 32a of the inner diameter side bladder 32 at a position facing each other, a larger fastening allowance can be secured. .

Next, the accumulator 50 according to the second embodiment will be described with reference to FIGS. In addition, the same structure as the said Example and the overlapping structure are abbreviate | omitted. As shown in FIG. 3, the accumulator 50 includes a shell 60, a bladder 70 that is disposed on the inner peripheral portion 60 b of the shell 60, and divides the internal space of the shell into a gas chamber G and a liquid chamber R, and one end. A gas port 61 (a holder of the present invention) which has an opening for drawing gas and presses and holds the peripheral portion 70a of the bladder 70 from the inner diameter side facing the inner peripheral portion 60b of the shell 60; And a plug 62 for preventing the shaft from coming off in the axial direction.

As shown in FIG. 3, the shell 60 is made of metal and is formed of a bottomed cylindrical member having an open upper end and an empty space inside. A hole 60 a is formed at the bottom of the shell 60 to form a liquid. Ports are connected in a sealed manner. A female screw portion 63 is formed on the inner peripheral surface of the upper end portion of the shell 60, and a plug 62 having a male screw portion is screwed into the female screw portion 63 to support the gas port 61.

As shown in FIGS. 3 and 4, the bladder 70 is a flexible, bottomed cylindrical film body in a natural state, and is opposed to the inner peripheral portion 60 b of the shell 60 in the natural state. The outer diameter side bladder 71 and the inner diameter side bladder 72 disposed on the inner diameter side of the outer diameter side bladder 71 have a two-layer structure. The outer diameter side bladder 71 is in contact with a liquid such as oil. It is made of a liquid-resistant material such as a rubber or a resin film having a high sealing property that is hardly deteriorated by the liquid. Further, the inner diameter side bladder 72 is made of a gas shielding material such as a rubber or a resin film that is hardly deteriorated by gas and does not transmit gas and has high shielding properties. The peripheral portion 70 a of the bladder 70 includes a peripheral portion 71 a of the outer diameter side bladder 71 and a peripheral portion 72 a of the inner diameter side bladder 72, and the peripheral portion 71 a of the outer diameter side bladder 71 is the inner peripheral portion 60 b of the shell 60. The peripheral portion 72a of the inner diameter side bladder 72 is in contact with the inner peripheral portion of the outer diameter side bladder 71, and the empty chamber is filled with a gas chamber G filled with gas and a liquid chamber R filled with a liquid such as oil. Are sealed in a sealed manner.

The outer diameter side bladder 71 has an annular

peripheral part

71b, 71c formed with a thick wall with a substantially rectangular cross section, an annular part 71d connecting the

peripheral part

71b, 71c, and the entire periphery from the lower end of the peripheral part 71c. It consists of a bottomed cylindrical portion 71f extending over. In addition,

annular protrusions

71g and 71e are formed on the outer peripheral portions of the

peripheral portions

71b and 71c, respectively, projecting radially outward along the entire periphery, and further, on the inner peripheral portions of the

peripheral portions

71b and 71c. The

annular protrusions

71h and 71j are formed to protrude radially inward over the entire circumference. The

peripheral portions

71 b and 71 c are compressed between the gas port 61 and the inner peripheral portion 60 b of the shell 60, and the

peripheral portions

71 b and 71 c of the outer diameter side bladder 71 are compressed in the gas port 61 and the inner peripheral portion 60 b of the shell 60. Closely sealed. In particular, the

annular protrusions

71g and 71e formed on the outer peripheral parts of the

peripheral parts

71b and 71c and the

annular protrusions

71h and 71j formed on the inner peripheral part are located between the gas port 61 and the inner peripheral part 60b of the shell 60. Therefore, the

peripheral edge portions

71b and 71c of the outer diameter side bladder 71 can be more closely attached to the gas port 61 and the shell 60 to improve the sealing performance.

As shown in FIG. 3 and FIG. 4, the inner diameter bladder 72 has an annular peripheral portion 72 b that is substantially rectangular in cross section and formed thick, and extends from the lower end portion of the peripheral portion 72 b over the entire periphery. A bottomed cylindrical portion 72f. In addition, on the outer peripheral portion of the annular peripheral edge 72b, two

annular protrusions

72g and 72e that protrude outward in the radial direction are formed over the entire periphery, and further, on the inner peripheral portion of the peripheral edge 72b. Is formed with a single annular protrusion 72h that protrudes radially inward over the entire circumference.

An inner peripheral portion of the inner peripheral side 72 b of the inner diameter side bladder 72 is pressed and held by a metal gas port 61, and an inner peripheral portion of the outer peripheral portion 72 b is caused by a surface pressure generated between the inner peripheral bladder 72 and the metal gas port 61. Sealed. On the other hand, the outer peripheral part of the peripheral part 72b is sealed by a surface pressure generated between the peripheral part 72b made of rubber and the cylindrical part 71f of the outer diameter side bladder 71 made of rubber. However, the surface pressure generated by the contact between the rubber and the rubber is lower than the surface pressure generated by the contact between the rubber and the metal. Therefore, the contact between the rubber peripheral portion 72b and the rubber cylindrical portion 71f. The sealing performance will be reduced. Therefore, two

annular protrusions

72g and 72e are provided on the outer peripheral portion of the peripheral edge portion 72b, and a single annular protrusion 72h is provided on the inner peripheral portion of the peripheral edge portion 72bc, and the

annular protrusions

72g, 72e, 72h, and By compressing the cylindrical portion 71f between the shell 60 and the metal gas port 61, a large surface pressure can be generated between the rubber peripheral portion 72b and the rubber cylindrical portion 71f. The gap between the peripheral edge 72 b of the inner diameter side bladder 72 and the cylindrical portion 71 f of the outer diameter side bladder 71 can be reliably sealed.

Further, as shown in FIG. 4B, annular

convex portions

61 a, 61 b, 61 c are formed on the outer peripheral portion of the gas port 61, and the annular

convex portions

61 a, 61 b, 61 c are formed on the outer diameter side bladder 71. By fitting and closely contacting the

recesses

73a and 73b and the end 73c of the inner diameter bladder 72 to form a labyrinth, it is possible to further improve the gas-to-gas sealing performance.

Although the embodiments of the present invention have been described with reference to the drawings, the specific configuration is not limited to these embodiments, and modifications and additions within the scope of the present invention are included in the present invention. It is.

For example, in the first embodiment, the peripheral portion 30 a of the bladder 30 is provided with the annular protrusion 31 g on the outer diameter side and the annular protrusion 32 h on the inner diameter side, but faces the annular protrusion 32 h of the inner diameter side bladder 32. An annular protrusion may be further provided on the outer diameter side of the position, and the peripheral portion 30a of the bladder 30 may be further compressed in the radial direction to provide a large tightening allowance to improve the sealing performance. At this time, the annular protrusion to be further provided may be provided on one of the outer diameter side bladder 31 and the inner diameter side bladder 32, or may be provided on both.

In the first and second embodiments, the outer peripheral side bladder and the outer peripheral portion of the inner diameter side bladder are sealed by the surface pressure generated between them. And the peripheral portion of the inner diameter side bladder may be bonded with an adhesive or the like, and surface pressure and bonding may be used in combination.

DESCRIPTION OF SYMBOLS 10 Accumulator 20 Shell 20b Inner peripheral part 30 Bladder 31 Outer diameter side bladder 31a Peripheral part 31g of outer diameter side bladder Outer annular protrusion 32 Inner diameter side bladder 32a Peripheral part 32g Outer annular protrusion 32h Inner annular protrusion 40 Holder 50 Accumulator 60 Shell 60b Inner peripheral part 61 Gas port (holder)
70 Bladder 71 Outer diameter side bladder 71a Peripheral edge 71g Outer annular protrusion 71e Outer annular protrusion 71h Inner annular protrusion 71j Inner annular protrusion 72 Inner diameter bladder 72a Perimeter 72e Outer annular protrusion 72g Outer annular protrusion 72h Inner annular protrusion Projection G Gas chamber R Liquid chamber

Claims

An accumulator for arranging a bladder inside the shell and partitioning the inner space of the shell into a gas chamber and a liquid chamber,
An outer diameter side bladder, the peripheral part of which is disposed on the inner peripheral part of the shell;
An inner diameter side bladder in which a peripheral edge formed to protrude to the inner diameter side is disposed inside the outer diameter side bladder;
A holder for holding a peripheral edge of the outer diameter side bladder and a peripheral edge of the inner diameter side bladder facing the inner peripheral part of the shell from the inner diameter side;
The peripheral portion of the outer diameter side bladder includes an outer annular protrusion on the outer diameter side, and the peripheral portion of the inner diameter side bladder includes an inner annular protrusion that contacts the holder on the inner diameter side. Characteristic accumulator.
The inner diameter side bladder is made of a material having a low gas permeability, the outer diameter side bladder is made of a material having liquid resistance, a gas chamber is disposed on the inner diameter side of the bladder, and the outer diameter side of the bladder is The accumulator according to claim 1, wherein a liquid chamber is disposed.
The accumulator according to claim 1 or 2, wherein the peripheral portion of the inner diameter side bladder further includes an outer annular protrusion on an outer diameter side thereof.
The inner annular protrusion of the inner diameter side bladder is provided at a position facing the outer annular protrusion of the outer diameter side bladder or the outer annular protrusion of the inner diameter side bladder. An accumulator according to any one of the above.
The accumulator according to any one of claims 1 to 4, wherein the peripheral portion of the outer diameter bladder is nested by the peripheral portion of the inner diameter bladder.
The accumulator according to any one of claims 1 to 5, wherein the peripheral portion of the outer diameter side bladder further includes an inner annular protrusion on the inner diameter side thereof.