JPH04101801U - Accumulator - Google Patents

Abstract

(57) [Summary] (with modifications) [Purpose] At the inner inflection point and outer inflection point of the curved inversion part,
Buckling of the elastic material layer of the bladder is suppressed. [Structure] At least the inner inflection point R _I of the inner inflection point R I and the outer inflection point R _O of the curve inversion portion _11C of the bladder is moved toward the peripheral edge, or the inner circumferential surface of the shell 21 is made to protrude. By doing so, the distance between at least the inner inflection point RI and the inner circumferential surface of the shell 21 of the inner inflection point R _I and the outer inflection point R _O of _the curve inversion part 11C of the bladder is reduced, and the curve inversion part 11C is reduced. The buckling stress of the elastic material layer at least at the inner inflection point R _I of the inner inflection point R _I and the outer inflection point R _O of 11C is increased to approach the breaking stress. [Effect] Buckling of the elastic material layer of the bladder can be suppressed at least at the inner inflection point of the inner inflection point and the outer inflection point of the curve reversal portion.

Description

[Detailed explanation of the idea]

0001

[Purpose of invention]

0002

[Industrial application field]

The present invention relates to an accumulator, and in particular, to an accumulator having a curved inverted portion of an elastic material layer of a bladder. At least the inner inflection point of the inner inflection point and the outer inflection point is moved to the peripheral edge side. The interior of the curved inverted portion of the bladder can be improved by Between at least the inner inflection point of the side inflection point and the outer inflection point and the inner peripheral surface of the shell. At least one of the medial and lateral inflection points of the inverted bladder The buckling stress of the elastic material layer at the inner inflection point is increased to approach the breaking stress. Regarding an accumulator that suppresses the occurrence of buckling in an elastic material layer. It is.

0003

[Conventional technology]

Conventionally, in this type of accumulator, as shown in the accumulator 20 shown in FIG . On the other hand, the internal space of the shell 21 is divided into a gas chamber 21A and a liquid chamber 21B by the mounting member 22, and under no load, the central portion 11A protrudes toward the end face of the peripheral portion 11B, and the liquid chamber As the liquid pressure in the liquid chamber 21B decreases, the central part 11A moves toward the liquid chamber 21B (also referred to as the "discharge direction"), and as the liquid pressure in the liquid chamber 21B increases, the central part 11A moves toward the liquid chamber 21B. One that moves in the direction of chamber 21A (also referred to as the "inhalation direction") was proposed.

0004

[Problems to be solved]

However, in the conventional accumulator 20 , at least the inner inflection point R _{I of the inner inflection point R I} and the outer inflection point R _O of the curved inversion portion _11C of the bladder 10 is relatively spaced apart from the peripheral edge portion 11 B . The distance y O between the inner inflection point R _I of the curved inverted portion 11C of the bladder 10 and the inner circumferential surface of the shell 21 and the distance y _O between the outer inflection point R _O and the inner circumferential surface of the shell 21 Among the distances y _I , at least the distance y _I between the inner inflection point R _I and the inner peripheral surface of the shell 21 is larger, and the seats at the inner inflection point R _I and the outer inflection point R _O of the elastic material layer 11 are larger. Since the bending stress was proportional to the reciprocal of the distance between the shell 21 and the inner circumferential surface, (i) the buckling stress at least at the inner inflection point R _I of the bladder 10 becomes small; (ii) Bladder 10 has the drawback that buckling tends to occur in elastic material layer 11 at inner inflection point R _I , especially (iii) when elastic material layer 11 of bladder 10 is formed of a resin material with low elasticity. However, it has the disadvantage that it is more likely to buckle, lacks durability, and cannot extend its life.

In the conventional accumulator 20 , when the gas shielding layer 12 is laminated on the elastic material layer 11 of the bladder 10 , especially (iv) the elasticity of the elastic material layer 11 and the elasticity of the gas shielding layer 12 do not match. Therefore, there was a drawback that the buckling stress of the curved inverted portion 11C became even smaller, making buckling more likely to occur.

[0006] Therefore, the present invention aims to eliminate these drawbacks by changing the curvature of the elastic material layer of the bladder. At least the inner inflection point of the inner inflection point and the outer inflection point of the curve reversal part is on the peripheral side. The curvature of the bladder can be reduced by moving the inner circumferential surface of the shell to At least the inner inflection point and the inner periphery of the shell among the inner inflection point and outer inflection point of the inversion part By reducing the distance between the inner and outer inflection points of the bladder's curve inversion, The buckling stress of the elastic material layer at least at the inner inflection point is increased to reduce the rupture stress. The accumulator is made by approaching the elastic material layer to prevent buckling from occurring in the elastic material layer. This is what we intend to provide.

[0007]

[Structure of the idea]

[0008]

[Means for solving problems]

The solution to the problem provided by the present invention is as follows: ``By bringing the outer circumferential surface of the peripheral edge of the bladder into contact with the inner circumferential surface of the shell, and fixing the elastic attachment part formed on the inner circumferential surface of the peripheral edge with a mounting member. In an accumulator in which the internal space of the shell is divided into a gas chamber and a liquid chamber, the inner inflection point (R _I ) and the outer inflection point (R _O ) of the curved inversion part (11C) of the elastic material layer of the bladder are By moving at least the inner inflection point (R _I ) toward the periphery (11B) or by protruding the inner circumferential surface of the shell, the inner inflection point (R _I ) of the inverted curved portion (11C) of the bladder can be adjusted. The distance between at least the inner inflection point (R _I ) of the outer inflection point (R _O ) and the inner peripheral surface of the shell is reduced, and the inner inflection point (R _I ) and the outer inflection point (R _O ), the buckling stress of the elastic material layer at least at the inner inflection point (R _I ) is increased to approach the breaking stress. be.

[0009]

[Effect]

The accumulator bladder according to the present invention is described in the above section [Means for solving problems]. As shown in Figure 2, the outer peripheral surface of the bladder is brought into contact with the inner peripheral surface of the shell. By fixing the elastic mounting part formed on the inner peripheral surface of the edge with the mounting member, the shell can be An accumulator that has an internal space divided into a gas chamber and a liquid chamber, in particular , the lesser of the inner and outer inflection points of the curved reversal of the elastic material layer of the bladder. In both cases, the inner inflection point is moved toward the periphery or the inner circumferential surface of the shell is made to protrude. By doing so, the least of the medial and lateral inflection points of the inverted bladder curvature is In addition, the distance between the inner inflection point and the inner circumferential surface of the shell is reduced, and the inner The seat of the elastic material layer at at least the inner inflection point of the side inflection point and the outer inflection point. Since the bending stress is increased to approach the breaking stress, (i) By increasing the buckling stress of the elastic material layer at the inverted part of the bladder, Action to approach breaking stress , which results in (ii) Effect of suppressing buckling at the reverse curved portion of the bladder and in turn (iii) Even if the elastic material layer is made of a resin material with low elasticity, the block Actions that ensure the durability of the rada and extend its lifespan to do.

0010

【Example】

Next, a preferred embodiment of the accumulator according to the present invention will be described, This will be explained in detail with reference to the accompanying drawings.

[0011] However, the embodiments described below may facilitate or facilitate understanding of the present invention. This information is described for the purpose of limiting the scope of this invention. There isn't.

0012 In other words, each element disclosed in the embodiments described below corresponds to the present invention. Including all design changes and equivalent substitutions within the spirit and technical scope. It is.

(Description of attached drawings)

FIG. 1 is a sectional view showing a first embodiment of the accumulator according to the present invention, and in particular, the inner inflection point R _I of the curved inverted portion 11C of the elastic material layer 11 of the bladder 10 and This shows a case where the outer inflection point R _O has been moved toward the peripheral edge 11B and the bladder 10 is in an unloaded state.

[0015]FIG. 2 is a cross-sectional view showing the state of use of the first embodiment shown in FIG. 1, and shows a case where the bladder 10 is in an unloaded state.

FIG. 3 is a sectional view for explaining the operation of the first embodiment shown in FIG. 1, and shows a case where the bladder 10 is in an unloaded state.

FIG. 4 is a sectional view showing a second embodiment of the accumulator according to the present invention, in particular, the inner peripheral surface of the shell 21 is protruded on the liquid chamber 21B side, and the bladder 10 is The case is shown in a no-load state.

FIG. 5 is a cross-sectional view showing the use state of the second embodiment shown in FIG. 4, in which the bladder 10 is in an unloaded state.

FIG. 6 is a sectional view for explaining the operation of the second embodiment shown in FIG. 4, and shows a case where the bladder 10 is in an unloaded state.

(Configuration of the first embodiment)

[0021] First, referring to FIGS. 1 to 3, the first embodiment of the accumulator according to the present invention will be described. The configuration of the embodiment will be described in detail.

Reference numeral 10 denotes a bladder incorporated in the accumulator 20 according to the present invention, which includes a central portion 11A, a peripheral portion 11B having an end surface formed in the direction in which the central portion 11A projects in a no-load state, and a central portion 11A. and a curved inverted portion 11C for connecting the peripheral edge portions 11B to each other, and an elastic material layer 11 made of a suitable elastic material such as rubber, and disposed inside the elastic material layer 11 as desired. A poppet 13 is provided on the outer circumferential surface of the central portion 11A of the elastic material layer 11 (ie, the surface located on the liquid chamber 21B side, which will be described later).

[0023] The elastic material layer 11 of the bladder 10 has a bond with the inner circumferential surface of the shell 21 of the accumulator 20 according to the present invention when the bladder 10 is attached to the inner circumferential surface of the shell 21 of the accumulator 20 according to the present invention as described later. (i) The thick elastic attachment part 11a extending along the end face of the peripheral edge part 11B is attached to the inner peripheral surface of the peripheral edge part 11B ( (ii) an elastic protrusion 11b extending along the end surface of the peripheral edge 11B is similarly formed on the outer peripheral surface of the peripheral edge 11B. has been done.

[0024] The elastic material layer 11 of the bladder 10 is designed to suppress the occurrence of buckling by bringing the buckling stress in the curved inverted portion 11C close to the breaking stress compared to the conventional example. It is formed by moving at least the inner inflection point R _I of the inner inflection point R _{I and the outer inflection point R O to} the peripheral edge 11B side (and thus closer to the inner circumferential surface of the shell 11) compared to the conventional example. are doing. Here, the inner inflection point R _I and the outer inflection point R _O are the connection parts between the curved inversion part 11C and the central part 11A and the peripheral part 11B, respectively, and are connected from the center part 11A to the curved inversion part 11C. This refers to a location where the curvature changes and becomes discontinuous toward , and also where the curvature changes and becomes discontinuous from the curved inverted portion 11C to the peripheral edge portion 11B.

Although not shown, the gas shielding layer 12 of the bladder 10 is made of polyvinyl alcohol resin, polyvinyl fluoride resin, or It is formed of a resin film with low gas permeability made of vinylidene chloride resin or the like or a gas shielding film made of metal foil, and includes at least one layer each of a reinforcing material and a gas shielding film. However, the gas shielding layer 12 may be formed of at least one gas shielding film, omitting the reinforcing material, if desired.

Reference numeral 20 denotes an accumulator according to the present invention, in which an internal space of a shell 21 is divided by a bladder 10 into a gas chamber 21A and a liquid chamber 21B. That is, in the accumulator 20 according to the present invention, the outer circumferential surface of the circumferential edge 11B of the bladder 10 is placed in contact with the inner circumferential surface of the shell 21, and then the elastic attaching portion 11a of the bladder 10 is attached to the shell 21 by the attaching member 22. By pressing the bladder 10 toward the inner circumferential surface of the shell 21, the bladder 10 is arranged against the inner circumferential surface of the shell 21, and the internal space of the shell 21 is divided into a gas chamber 21A and a liquid chamber 21B.

The distances x I1 and x _O1 between the inner peripheral surface of the shell 21 and the inner inflection point R _I and the outer inflection point R _O of the curved inverted portion 11C of the bladder 10 are the same as the inner inflection point R _{I and the outer inflection point R O .} Since at least the inner inflection point R _I of the outer inflection points R _O is closer to the peripheral edge 11C than in the conventional example, at least the distance x _O1 is reduced compared to the conventional example. Therefore, the buckling stress of the elastic material layer 11 at the inner inflection point R _I and the outer inflection point R _O of the curved inverted portion 11C of the bladder 10 is increased and approached to its breaking stress. Here, the buckling stress of the elastic material layer 11 refers to a stress value at which the elastic material layer 11 buckles, and when this stress value is exceeded, the elastic material layer 11 buckles. Furthermore, the breaking stress of the elastic material layer 11 refers to a stress value at which the elastic material layer 11 breaks, and when this stress value is exceeded, the elastic material layer 11 breaks.

[0028] Gas chamber 21A of shell 21 is supplied with an appropriate gas (for example, nitrogen gas) through a gas supply port. 23a, the gas is supplied by the closing member 23 and the sealing member 23b. It is sealed by closing the inlet 23a.

[0029] The liquid chamber 21B of the shell 21 has a liquid chamber whose inner opening can be closed by a poppet 13. A liquid inlet/outlet member (so-called "oil port") 24 with an inner hole 24a is provided. There is. Therefore, the liquid chamber 21B has a threaded portion formed on the circumferential surface of the liquid inlet/outlet member 24. 24b through the liquid guide hole 24a. and is in communication with a suitable liquid supply source (not shown), and is connected to the liquid pressure of that liquid supply source. An appropriate amount of liquid is supplied accordingly.

(Operation of the first embodiment)

[0031] Furthermore, with reference to FIGS. 1 to 3, the first embodiment of the accumulator according to the present invention will be described. The operation of the embodiment will be explained in detail.

[0032] No load

[0033] In the accumulator 20 according to the present invention, in an unloaded state, the central portion 11A of the bladder 10 is reversed at the curved reversal portion 11C and protrudes toward one side (that is, the side corresponding to the gas chamber 21A). and protrudes in the same direction as the end surface of the peripheral edge portion 11B (see FIGS. 1 to 3).

[0034] At this time, in the curved inverted portion 11C, the elastic material layer 11 is formed on both the inner peripheral surface side and the outer peripheral surface side. Since no load is applied to the elastic material layer 11, the elastic material layer 11 is not deformed and no stress is applied. Not occurred.

[0035] When discharging liquid

In the accumulator 20 according to the present invention, when the liquid pressure of the liquid supply source decreases, the central portion 11A gradually moves toward the liquid chamber 21B (that is, toward the “discharge direction”) as shown by arrow A. and stops at a position where the pressures applied to both sides (that is, the gas pressure in the gas chamber 21A and the liquid pressure in the liquid chamber 21B) are balanced with each other.

[0037]At this time, in the curved inversion portion 11C of the bladder 10 , the elastic material layer 11 is expanded on the inner circumferential side and contracted on the outer circumferential side, but the inner inflection point R _I and the outer inflection point R _O Since at least the inner inflection point R _I is brought closer to the peripheral edge 11B, (i) at least the distance x _I1 between the distances x _I1 and x _O1 to the inner circumferential surface of the shell 21 can be reduced; Furthermore, (ii) the buckling stress of the elastic material layer 11 can be increased to approach its breaking stress, and as a result (iii) the occurrence of buckling in the elastic material layer 11 can be suppressed.

[0038] When inhaling liquid

On the other hand, when the liquid pressure of the liquid supply source increases, in the accumulator 20 according to the present invention, the central part 11A of the bladder 10 moves in the direction of the arrow B toward the gas chamber 21A (ie, in the "suction direction"). As shown, it gradually moves and stops at a position where the pressures applied to both sides (that is, the gas pressure in the gas chamber 21A and the liquid pressure in the liquid chamber 21B) are balanced with each other.

[0040]At this time, in the curved inversion portion 11C of the bladder 10 , the elastic material layer 11 is contracted on the inner circumference side and expanded on the outer circumference side, but the inner inflection point R _I and the outer inflection point R _O Since at least the inner inflection point R _I is brought closer to the peripheral edge 11B, (i) at least the distance x _I1 between the distances x _I1 and x _O1 to the inner circumferential surface of the shell 21 can be reduced; Furthermore, (ii) the buckling stress of the elastic material layer 11 can be increased to approach its breaking stress, and as a result (iii) the occurrence of buckling in the elastic material layer 11 can be suppressed.

Therefore, the accumulator 20 according to the present invention maintains its elasticity even if the central portion 11A of the bladder 10 repeatedly approaches and separates from the liquid inlet/outlet member 24 due to fluctuations in the liquid pressure of the liquid supply source. Since at least the inner inflection point R _I of the inner inflection point R I and the outer inflection point R _O of the curved inverted portion _11C of the material layer 11 is brought closer to the peripheral edge 11B, the inner inflection point of the curved inverted portion 11C is It is possible to increase the buckling stress at least at the inner inflection point R _I of the inflection point R _I and the outer inflection point R _O to approach the breaking stress, thereby preventing buckling from occurring at the curved inversion portion 11C. It can be suppressed.

In other words, the accumulator 20 according to the present invention can cope with fluctuations in the liquid pressure of the liquid supply source (not shown) even when the bladder 10 is formed of a resin material with low elasticity, and even when the bladder 10 is formed of a resin material with low elasticity, Good durability characteristics can be ensured over a long period of time, resulting in a longer service life.

(Second example)

[0044] In addition, referring to FIGS. 4 to 6, the second embodiment of the accumulator according to the present invention The structure and operation of the embodiment will be explained in detail.

In the second embodiment, instead of moving the inner inflection point R _I and the outer inflection point R _O of the curved inversion portion 11C of the bladder 10 toward the peripheral edge 11B, the inner circumferential surface of the shell 21 is injected with liquid. It has substantially the same structure as the first embodiment except that a protrusion 21a protrudes from the chamber 21B side.

Therefore, in the second embodiment, as in the first embodiment, the inner inflection point R _I of the curved inverted portion 11 C of the bladder 10 and the inner circumferential surface of the shell 21 (particularly the protruding portion 21 a) It has the effect of reducing at least the distance x _I2 of the distance x _I2 between the two and the distance x _O2 between the outer inflection point R _O and the inner circumferential surface of the shell 21.

[0047] Therefore, in the second embodiment, for the purpose of brevity of explanation, The same reference numerals as in the first embodiment are given to the members corresponding to the members in the first embodiment. other explanations will be omitted.

(Modified example) In the above description, at least the inner inflection point R I of the inner inflection point R _I and the outer inflection point R _O of the curved inversion portion _11C of the bladder 10 is set to a peripheral edge portion compared to the conventional example. 11B side or by making the inner circumferential surface of the shell 21 protrude from the liquid chamber 21B side, at least the inner side of the inner inflection point R _I and the outer inflection point R _O of the curved inversion part 11C of the bladder 10 Although the distance between the inflection point R _I and the inner peripheral surface of the shell 21 is reduced compared to the conventional example, the present invention is not limited to this, and the distance between the inflection point R I and the inner peripheral surface of the shell 21 is reduced. By moving at least the inner inflection point of the inflection point and the outer inflection point toward the peripheral edge side compared to the conventional example, and by making the inner circumferential surface of the shell protrude on the liquid chamber side, the inner side of the curved inverted portion of the bladder is moved. It also covers the case where the distance between at least the inner inflection point of the inflection point and the outer inflection point and the inner circumferential surface of the shell is reduced compared to the conventional example. ing.

[0049]

[Effect of the idea]

As is clear from the above, the accumulator bladder according to the present invention has the following problems: As clearly stated in the column ``Measures to solve the problem'', the outer periphery of the bladder relative to the inner periphery of the shell The elastic mounting part formed on the inner circumferential surface of the periphery is fixed by the mounting member by bringing the surfaces into contact with each other. By doing so, the internal space of the shell is divided into a gas chamber and a liquid chamber. data, in particular the inner inflection point and the outer side of the curved reversal of the elastic material layer of the bladder. At least the inner inflection point of the inflection points is moved to the peripheral side or the shell By protruding the inner circumferential surface, the inner inflection point and outer side of the curved inverted part of the bladder are By reducing the distance between at least the inner inflection point and the inner peripheral surface of the shell, At least the inner inflection point of the inner inflection point and the outer inflection point of the curved inversion part of the This increases the buckling stress of the elastic material layer to approach the breaking stress. (i) By increasing the buckling stress of the elastic material layer at the inverted part of the bladder, Effect that can approach breaking stress , which results in (ii) Effect of suppressing the occurrence of buckling at the curved inverted portion of the bladder and, in turn, (iii) Even if the elastic material layer is made of a resin material with low elasticity, the block The effect of ensuring the durability of the rada and extending its lifespan has.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a first embodiment of an accumulator according to the present invention.

FIG. 2 is a sectional view showing how to use the first embodiment shown in FIG. 1;

FIG. 3 is a sectional view for explaining the operation of the first embodiment shown in FIG. 1;

FIG. 4 is a sectional view showing a second embodiment of the accumulator according to the present invention.

FIG. 5 is a sectional view showing how to use the second embodiment shown in FIG. 4;

6 is a sectional view for explaining the operation of the second embodiment shown in FIG. 4. FIG.

FIG. 7 is a sectional view for explaining a conventional example.

[Explanation of symbols] 10・・・・・・・・・・・・・・・・・・ Bladder 11・・・・・・・・・・・・・・・Elastic material layer 11A・・・・・・・・・・・・・・・Central part 11B ・・・・・・・・・・・・・・・Peripheral part 11C ・・・・・・・・・・・・・・・Curvature inversion Part R _I ...Inner inflection point R _O ...Outer inflection point 11a...・・Elastic attachment part 11b ・・・・・・・・・・・・・・Elastic protrusion 12 ・・・Gas shielding layer 13 ・・・・・・・・・・・・・・・・・・Poppet 20・・・・・・・・・・・・・・・・・・ Accumulator 21・・・・・・・・・・・・・・・...Shell 21a ...Protrusion 21A ...... Gas chamber 21B ......・・・・・・Liquid chamber 22・・・・・・・・・・・・・・・Mounting member 23・・・・・・・・・・・・・・・Closing member 23a ・・・・・・・・・・・・・・・Gas supply port 23b ・・・・・・・・・・・・・・・Seal member 24・・・・・・・・・・・・・・・...Liquid inlet/outlet member 24a ......Liquid guide hole 24b ......Threaded part

Claims (1)

[Scope of utility model registration request] Claim 1: By bringing the outer circumferential surface of the peripheral edge of the bladder into contact with the inner circumferential surface of the shell and fixing the elastic mounting portion formed on the inner circumferential surface of the peripheral edge with a mounting member, the inner space of the shell can be connected to the gas chamber and the liquid. In the accumulator which is divided into a chamber, at least the inner inflection point (R _I ) and the outer inflection point (R _O ) of the curve inversion part (11C) of the elastic material layer _of the bladder ) to the peripheral edge (11B) side or by protruding the inner circumferential surface of the shell, the inner inflection point (R _I ) and outer inflection point of the curved inverted portion (11C) of the bladder are reduced.
The distance between at least the inner inflection point (R _I ) of (R _O ) and the inner peripheral surface of the shell is reduced, and the distance between the inner inflection point (R I ) and the outer inflection point ( _R An accumulator characterized in that the buckling stress of the elastic material layer at least at the inner inflection point (R _I ) of the points (R _O ) is increased to approach the breaking stress.