JPH0662201U - accumulator - Google Patents

Abstract

(57) [Abstract] [Purpose] Eliminate the gap remaining in the gas guide hole of the inner shell, and eventually prevent part of the bladder from entering the gap remaining in the gas guide hole of the inner shell. Prevents damage to the bladder. [Composition] A gas guide hole (12b) in an inner shell that divides a gas chamber partitioned by a bladder into at least two gas small chambers.
On the other hand, the porous plug body (15) is arranged. [Effect] The gap remaining in the gas guide hole of the inner shell can be eliminated, and by extension, a part of the bladder can be prevented from entering the gap remaining in the gas guide hole of the inner shell.
As a result, damage to the bladder can be suppressed.

Description

[Detailed description of the device]

[0001]

[The purpose of the device]

[0002]

[Industrial applications]

 The present invention relates to an accumulator in which a gas chamber is divided into at least two gas small chambers by disposing an inner shell inside a shell whose internal space is divided into a gas chamber and a liquid chamber by a bladder, and in particular, The present invention relates to an accumulator in which a porous plug body is arranged in a gas guide hole of a shell.

[0003]

[Prior art]

 Conventionally, in this type of accumulator, the central part of the bladder, which is protruded toward the end face of the peripheral portion in the unloaded state, is in the liquid chamber direction (also referred to as “discharging direction”) as the liquid pressure in the liquid chamber decreases. ) And as the liquid pressure in the liquid chamber increases, it moves toward the gas chamber (also called the “suction direction”) to absorb and mitigate fluctuations in the liquid pressure of the liquid supply source. In this case, the inner shell divides the gas chamber into at least two small gas chambers, and the valve body is placed in the gas guide hole that connects the two small gas chambers, so that the liquid pressure of the liquid supply source increases rapidly. It has been proposed to suppress the movement of gas between the two gas chambers by means of a valve body to absorb and alleviate the deformation of the bladder that accompanies rapid changes in liquid pressure.

[0004]

[Problems to be solved]

 However, in the conventional accumulator, since a gap remains between the inner peripheral surface of the gas guide hole of the inner shell and the outer peripheral surface of the valve body, the central portion of the bladder increases as the liquid pressure in the liquid chamber increases. Part of the bladder against the gap remaining between the inner peripheral surface of the gas guide hole and the outer peripheral surface of the valve body when the gas moves toward the gas chamber and is brought into contact with the surface of the inner shell. However, there is a drawback that (ii) the bladder is excessively stretched in the vicinity of the central portion and is easily damaged.

In view of the above, the present invention provides an accumulator in which a porous plug body is arranged in the gas guide hole of the inner shell in order to eliminate these drawbacks.

[0006]

[Constitution of device]

[0007]

[Means for solving problems]

 According to the present invention, there is provided a solution to a problem, "A gas chamber is divided into at least two gas chambers by disposing an inner shell inside a shell whose inner space is divided into a gas chamber and a liquid chamber. In the divided accumulator, the porous plug body (15) is arranged with respect to the gas guide hole (12b) of the inner shell ”.

[0008]

[Action]

 An accumulator bladder according to the present invention is an accumulator in which a gas chamber is divided into at least two gas small chambers by disposing the inner shell inside a shell whose internal space is divided into a gas chamber and a liquid chamber by the bladder. The structure is as described in the section [Means for solving problems] described above, and in particular, since the porous plug is provided for the gas guide hole of the inner shell, (i) It has the function of eliminating the gap remaining in the gas guide hole of the inner shell, and (ii) prevents the part of the bladder from entering the gap remaining in the gas guide hole of the inner shell. (Iii) It acts to prevent the bladder from being damaged.

[0009]

【Example】

 Next, the accumulator according to the present invention will be specifically described with reference to the accompanying drawings with reference to preferred embodiments thereof.

However, the embodiments described below are provided for facilitating or facilitating the understanding of the present invention, and not for limiting the present invention.

In other words, each element disclosed in the embodiments described below includes all design changes and equivalent replacements within the spirit and scope of the present invention.

(Description of the accompanying drawings)

FIG. 1 is a sectional view showing an embodiment of the accumulator according to the present invention, and particularly shows a state in which the bladder 20 is not yet in contact with the inner shell 12.

FIG. 2 is a sectional view for explaining the operation of the embodiment shown in FIG. 1, and particularly shows a state in which the bladder 20 is already in contact with the inner shell 12.

(Structure of Example)

First, referring to FIG. 1, the configuration of an embodiment of the accumulator according to the present invention will be described in detail.

[0017]TenIs an accumulator according to the present invention, which is described below.20The inner space of the shell 11 is divided into a gas chamber 11A and a liquid chamber 11B by the inner shell 12, and the gas chamber 11A is divided by the inner shell 12 into the first gas small chamber 11A.₁And the second gas chamber 11A₂It is divided into and. That is, the accumulator according to the present inventionTenThe bladder against the inner surface of the shell 11. 20 The bladder mounting portion 12a formed on the outer peripheral surface of the inner shell 12 so as to abut the outer peripheral surface of the peripheral edge portion 21B of the inner shell 12 presses the elastic mounting portion 21a toward the inner peripheral surface of the shell 1120Is held on the inner peripheral surface of the shell 11, and the internal space of the shell 11 is partitioned into a gas chamber 11A and a liquid chamber 11B. The inner shell 12 has one surface (that is, a bladder) on a locking step portion 11c formed on the inner peripheral surface of the shell 11.20It is fixed to the inside of the shell 11 by locking the peripheral edge of the surface 12c that does not face the surface 12c.

In the gas chamber 11 A of the shell 11 (that is, the first gas chamber 11 A ₁ and the second gas chamber 11 A ₂ ), an appropriate inert gas (for example, nitrogen gas) is supplied to the gas supply port 11 of the shell 11. After being filled from b, the gas supply port 11b is closed by closing the closing member (so-called “gas plug”) 13 and the seal member (here, O-ring) 13a.

In the liquid chamber 11B of the shell 11, the base end of the oil port (that is, the liquid inlet / outlet member) 14 having a liquid guide hole 14a whose inner opening can be closed by a poppet 23 described later is attached to the oil port mounting opening 11a. By arranging and connecting the tip part to a liquid supply pipe (not shown), the liquid supply pipe (not shown) is connected. That is, the liquid chamber 11B of the shell 11 is provided with a liquid supply pipe (not shown) with respect to the screw portion 14b formed on the outer peripheral surface or the inner peripheral surface (here, the outer peripheral surface) of the tip of the oil port 14. By screwing the screw portion, it is communicated with an appropriate liquid supply source through the liquid guide hole 14a and the liquid supply pipe, and an appropriate amount of liquid (for example, brake fluid) depending on the liquid pressure of the liquid supply source. , Water or oil) is supplied.

In the inner shell 12, the first gas chamber 11A₁And the second gas chamber 11A₂A gas guide hole 12b is formed to allow the movement of gas between the gas guide hole 12b and the gas guide hole 12b. In the gas guide hole 12b, the liquid pressure in the liquid chamber 11B rapidly rises, and the second gas small chamber 11A₂To 1st gas chamber 11A₁ When the gas tends to move in a short time, it is temporarily suppressed and bladder 20 A porous plug 15 is provided for the purpose of mitigating the rapid movement and deformation of the. By the way, there is a bladder between the gas guide hole 12b and the porous plug 15.20There are no gaps left to allow the invasion of. In addition, the porous plug 15 is the first gas chamber 11A.₁And the second gas chamber 11A₂It suffices that it does not hinder the movement of the gas between them and suppress the rapid movement thereof, and it may be made of a desired material such as a porous sintered alloy or porous Teflon.

[0021] Other surface (i.e. facing surface bladder 20) 12d of the shell 12, when the central portion 21A of the bladder 20 is brought into contact is accompanied to the liquid pressure in the liquid chamber 11B is increased, the bladder 20 It is possible to avoid leaving a large void between the surface of the bladder 20 (i.e., the surface facing the inner shell 12) 20a, and to prevent the bladder 20 from being excessively stretched at the bending reversal portion 21C or the like to cause excessive stress. In order to prevent it, it is preferable that the surface 20a of the bladder 20 has a shape corresponding to the shape in the unloaded state (that is, a shape matching or approximating). That is, the other surface 12d of the inner shell 12 is formed with a curved convex portion 12e at its peripheral portion so as to ensure a shape corresponding to the surface shape of a part of the curved reversal portion 21C of the bladder 20 in the unloaded state, and the central portion. A recess 12f is formed in the center of the bladder 20 to ensure a shape corresponding to the surface shape of the bladder 20 in the unloaded state, and at the same time, the rest of the curved reversal part 21C of the bladder 20 is unloaded from the peripheral portion to the central portion. It is preferable that the concave surface is gently curved so as to ensure a shape corresponding to the surface shape in the state.

The oil port 14 has a base end portion, that is, an outer peripheral portion of an inner end surface expanded, and is arranged so as to avoid a problem when the oil port 14 is disposed in the oil port mounting opening 11a of the shell 11 and then welded. Has been done.

Reference numeral 20 denotes a bladder for partitioning the gas chamber 11A and the liquid chamber 11B into the accumulator 10 according to the present invention, the central portion 21A and the central portion 21A being directed toward the protruding direction in the unloaded state. An elastic material layer 21 formed of an appropriate elastic material such as rubber, which includes a peripheral edge portion 21B having an end face, a central portion 21A, and a curved inversion portion 21C for connecting the peripheral edge portion 21B to each other. It is made of a suitable material having low gas permeability and is prevented from being sucked into the gas shield layer 22 disposed inside the elastic material layer 21 as desired and the liquid guide hole 14a of the oil port 14. The poppet 23 is provided for the other surface of the elastic material layer 21 (that is, the surface not facing the inner shell 12) 20b for the purpose of corresponding to the central portion 21A.

[0024] the elastic material layer 21 of the bladder 20, when mounted to the inner peripheral surface of the shell 11 as described above by the outer peripheral surface of the inner shell 12 is bladder 20, between the inner peripheral surface of the shell 11 In order to secure a sufficient seal, (i) the thick elastic mounting portion 21a extended along the end face of the peripheral edge portion 21B is made of an appropriate elastic material such as rubber, and The elastic projection 21b is formed on the peripheral surface of the one surface 20a facing the shell 12 and (ii) the elastic projection 21b extending along the end face of the peripheral portion 21B is also formed on the outer peripheral surface of the peripheral portion 21B. It is formed on the peripheral portion of the other surface 20b that does not face the inner shell 12.

Although not shown, the gas shielding layer 22 of the bladder 20 is generally made of polyvinyl alcohol resin on at least one surface of a reinforcing material such as woven cloth (for example, knitted cloth) or nonwoven cloth. , A polyvinyl fluoride resin or a vinylidene chloride resin, which has a low gas permeability and is provided with at least one layer of a gas shielding film made of a metal foil. However, in the gas shielding layer 22, the reinforcing material may be omitted if desired.

(Operation of Example)

Further, with reference to FIGS. 1 and 2, the operation of an embodiment of the accumulator according to the present invention will be described in detail.

Operation when the liquid pressure matches the gas pressure

In the accumulator 10 according to the present invention, the liquid pressure of the liquid supply source (not shown) has an appropriate magnitude and matches the gas pressure of the gas chamber 11A, and the bladder 20 has the shape shown in FIG. When stopped, the bladder 20 is inverted at the curved inversion portion 21C and protrudes toward one side at the central portion 21A (that is, the side corresponding to the gas chamber 11A) in the same direction as the end face of the peripheral edge portion 21B. .

At this time, the porous plug body 15 arranged in the gas guide hole 12b of the inner shell 12 suppresses the movement of gas between the _first small gas chamber 11A ₁ and the second small gas chamber 11A _2. Or not hinder. Therefore, the gas can freely move through the porous plug 15 between the _first small gas chamber 11A ₁ and the second small gas chamber 11A ₂ . As a result, the gas pressure in the _first small gas chamber 11A ₁ is kept equal to the gas pressure in the _second small gas chamber 11A ₂ and is kept equal to the liquid pressure in the liquid chamber 11B.

Operation when liquid pressure increases ... Liquid suction operation

When the liquid pressure of the liquid supply source increases as compared with the state shown in FIG. 1, in the accumulator 10 according to the present invention, the liquid is supplied from the liquid supply source through the liquid supply pipe to the oil port 14 Is supplied to the liquid guide hole 14a. Along with this, the liquid is supplied to the liquid chamber 11B of the shell 11 from the liquid guide hole 14a of the oil port 14, so that the liquid pressure increases.

When the liquid pressure increases slowly

When the increase in the liquid pressure in the liquid chamber 11B of the shell 11 is slow, the central portion 21A of the bladder 20 is slowly moved toward the gas chamber 11A side (that is, the “intake direction”) as indicated by the arrow X. , And the pressure applied to both surfaces 20a, 20b (that is, the gas pressure of the gas chamber 11A and the liquid pressure of the liquid chamber 11B) is stopped at a position where they are in equilibrium with each other.

[0035] At this time, since the movement in the arrow X direction of the center portion 21A of the bladder 20 is slow, the increase in gas pressure in the second gas chamber 11A ₂ is slow, from the second gas chamber 11A ₂ The movement of the gas to the _first gas chamber 11A ₁ is slow. Therefore, the porous plug 15 disposed in the gas guide hole 12b of the inner shell 12 substantially suppresses the movement of gas between the first gas small chamber 11A ₁ and the second gas small chamber 11A _2. Or not hinder. Therefore, as the volume of the second gas chamber 11A ₂ is reduced as the bladder 20 moves, gas is freely supplied from the second gas chamber 11A ₂ to the first gas chamber 11A _1. It As a result, the gas pressure in the _first small gas chamber 11A ₁ is always kept equal to the gas pressure in the _second small gas chamber 11A ₂ .

When the liquid pressure of the liquid supply source further increases, in the accumulator 10 according to the present invention, the liquid is supplied from the liquid supply source to the liquid guide hole 14 a of the oil port 14 via the liquid supply pipe. . Along with this, since the liquid is supplied to the liquid chamber 11B of the shell 11 from the liquid guide hole 14a of the oil port 14, the liquid pressure increases.

As the liquid pressure in the liquid chamber 11B of the shell 11 increases, the central portion 21A of the bladder 20 further moves toward the gas chamber 11A side (that is, the "intake direction") as shown by the arrow X, and The surface 20a is brought into contact with the other surface 12d (particularly the recess 12f) of the inner shell 12 as shown in FIG.

Along with this, the central portion 21A of the bladder 20 abuts and closes the gas guide hole 12b of the inner shell 12, so that the first gas chamber 11A ₁ and the second gas chamber 11A ₁ through the porous plug 15 are closed. The movement of gas between the gas chamber 11 A ₂ and the gas chamber 11 A ₂ is blocked.

When the liquid pressure increases rapidly

When the liquid pressure in the liquid chamber 11B of the shell 11 is rapidly increasing, the central portion 21A of the bladder 20 is rapidly moved toward the gas chamber 11A side (that is, “intake direction”) as indicated by an arrow X. The pressure applied to both sides 20a, 20b (ie the gas pressure of the gas chamber 11A; the gas pressure of the second gas chamber 11A ₂ and the liquid pressure of the liquid chamber 11B) are mutually Stop at equilibrium position.

At this time, since the central portion 21A of the bladder 20 moves rapidly in the direction of the arrow X, the gas pressure in the _second gas chamber 11A ₂ increases rapidly, and the gas guide hole 12b of the inner shell 12 does not move. The gas is also rapidly transferred from the _second gas chamber 11A ₂ to the first gas chamber 11A ₁ via the gas. Therefore, the porous plug 15 disposed in the gas guide hole 12b of the inner shell 12 temporarily suppresses the movement of gas between the first gas small chamber 11A ₁ and the second gas small chamber 11A _2. To do. Therefore, as the volume of the second gas chamber 11A ₂ is reduced with the movement of the bladder 20 , the gas pressure of the _second gas chamber 11A ₂ is lower than that of the first gas chamber 11A _1. Temporarily increase. As a result, the movement of the central portion 21A of the bladder 20 in the direction of the arrow X is temporarily suppressed, and as a result, the deformation of the bladder 20 is temporarily suppressed.

When the liquid pressure of the liquid supply source further increases, in the accumulator 10 according to the present invention, the liquid is supplied from the liquid supply source to the liquid guide hole 14 a of the oil port 14 via the liquid supply pipe. . Along with this, since the liquid is supplied to the liquid chamber 11B of the shell 11 from the liquid guide hole 14a of the oil port 14, the liquid pressure increases.

As the liquid pressure in the liquid chamber 11B of the shell 11 increases, the central portion 21A of the bladder 20 further moves toward the gas chamber 11A side (that is, the “intake direction”) as indicated by the arrow X, and The surface 20a is brought into contact with the other surface 12d (particularly the recess 12f) of the inner shell 12 as shown in FIG.

Along with this, the central portion 21A of the bladder 20 is abutted to close the gas guide hole 12b of the inner shell 12, so that the first gas chamber 11A ₁ and the second gas chamber 11A ₁ through the porous plug 15 are closed. The movement of gas between the gas chamber 11 A ₂ and the gas chamber 11 A ₂ is blocked.

Operation when liquid pressure decreases ... Liquid discharge operation

When the liquid pressure of the liquid supply source is reduced as compared with the state shown in FIG. 1 or 2, for example, the accumulator 10 according to the present invention has the central portion 21A of the bladder 20 on the liquid chamber 11B side (that is, The pressure applied to both sides 20a, 20b (ie, the gas pressure of the gas chamber 11A and the liquid pressure of the liquid chamber 11B; the state shown in FIG. 2). In this case, the gas pressure in the second gas chamber 11A ₂ and the liquid pressure in the liquid chamber 11B) substantially stop at a position where they are in equilibrium with each other. With the movement of the central portion 21A of the bladder 20 , the liquid in the liquid chamber 11B of the shell 11 is discharged toward the liquid supply source through the liquid guide hole 14a of the oil port 14.

When the liquid pressure of the liquid supply source further decreases, the accumulator 10 according to the present invention is arranged such that the central portion 21A (ie, poppet 23) of the bladder 20 is directed toward the liquid chamber 11B side (ie, “discharging direction”). It moves as shown by the arrow Y to come into contact with the oil port 14 to close the liquid guide hole 14a of the oil port 14.

At this time, if the bladder 20 is moved slowly in the arrow Y direction regardless of whether the liquid pressure of the liquid supply source was initially in the state shown in FIG. 1 or in the state shown in FIG. The porous plug 15 does not suppress or inhibit the movement of gas from the _first gas small chamber 11A ₁ to the second gas small chamber 11A ₂ . For this reason, as the volume of the second gas chamber 11A ₂ is gradually expanded as the blade 20 moves, the second gas chamber 11A ₂ is free from gas from the first gas chamber 11A _1. Is supplied to. As a result, the gas pressure of the _first small gas chamber 11A ₁ is maintained equal to the gas pressure of the _second small gas chamber 11A ₂ .

[0049] In contrast, in the case where the bladder 20 initially liquid pressure regardless of whether there the state shown in either FIG. 2 was in the state shown in FIG. 1 of the liquid supply source is rapidly moved in the direction of arrow Y The porous plug 15 temporarily suppresses or inhibits the movement of gas from the _first small gas chamber 11A ₁ to the second small gas chamber 11A ₂ . Thus, although the volume of the second gas chamber 11A ₂ is about to be expanded rapidly become accompanied with the movement of the probe Rada 20, the second gas chamber 11A _2, gas from the first gas chamber 11A ₁ Are not supplied freely, and the movement of the bladder 20 is temporarily suppressed, and thus its deformation is temporarily suppressed.

As is clear from the above, according to the accumulator 10 of the present invention, since the porous plug 15 is arranged in the gas guide hole 12b of the inner shell 12, (i) the gas guide hole 12b. The gap between the inner peripheral surface of the bladder 20 and the porous plug 15 can be eliminated, and (ii) when the bladder 20 is brought into contact with the inner shell 12, it remains between the gas guide hole 12b and the porous plug 15. It is possible to avoid the damage caused by entering the gap.

Further, according to the accumulator 10 of the present invention, the shape of the other surface 12d of the inner shell 12 is made to correspond to the shape of the one surface 20a of the bladder 20 in the unloaded state. When the central portion 21A of the bladder 20 moves toward the gas chamber 11A side and abuts on the inner shell 12, a sufficient space is left between the one surface 20a of the bladder 20 and the other surface 12d of the inner shell 12. And (ii) it is possible to sufficiently reduce the amount of gas remaining between them, (iii) it is possible to prevent the bladder 20 from being excessively elongated and damaged, and (iv) one surface 20a of the bladder 20. It is possible to reduce the amount of gas that permeates the bladder 20 and moves to the liquid chamber 11B from the gap remaining between the inner shell 12 and the other surface 12d of the inner shell 12.

[0052]

[Effect of device]

 As is apparent from the above, the accumulator according to the present invention has at least two gas chambers by providing an inner shell inside a shell whose inner space is divided into a gas chamber and a liquid chamber by a bladder. The accumulator is divided into sections and is constructed as specified in the [Problem solving means] column. In particular, a porous plug is provided for the gas guide hole of the inner shell. Therefore, (i) it has an effect of eliminating the gap remaining in the gas guide hole of the inner shell, and (ii) avoids part of the bladder entering the gap remaining in the gas guide hole of the inner shell. It has an effect that can be achieved, and as a result (iii) has an effect that can prevent damage to the bladder.

[Brief description of drawings]

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

FIG. 2 is a sectional view for explaining the operation of the embodiment shown in FIG.

[Explanation of symbols] 10 ................... Accumulator 11 ...・ ・ ・ ・ ・ ・ ・ ・ ・ Shell 11A ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Gas chamber 11A ₁・ ・ ・ ・ ・ ・ ・ ・・ ・ ・ ・ ・ ・ ・ ・ First gas chamber 11A ₂・ ・ ・ ・ ・ ・ ・ Second gas chamber 11B ・ ・ ・ ・ ・ ・Liquid chamber 11a ・ Oil port mounting opening 11b ・ ・ ・ ・ ・ ・・ ・ ・ ・ Gas supply port 11c ・ ・ ・ ・ ・ ・ ・ Lock step 12 ・ ・・ ・ ・ ・ ・ ・ ・ ・ ・ Inner shell 12a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Bladder Taking Attached part 12b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Gas guide hole 12c ・ ・ ・ ・ ・ ・・ One surface 12d ・ ・ ・ ・ Other surface 12e ・ ・ ・ ・ ・ ・・ Curved convex 12f ・ ・ ・ ・ ・ ・ ・ Concave 13 ・ ・ ・ ・ ・ ・Gas plug 13a ... Seal member 14 ...・ ・ ・ ・ ・ ・ ・ Oil port 14a ・ ・ ・ ・ ・ ・ ・ Liquid guide hole 14b ・ ・ ・ ・ ・ ・・ ・ ・ ・ ・ ・ ・ ・ Screw part 15 ・ ・ ・ ・ ・ ・ ・ ・ Porous plug 20・ ・ ・ ・・ ・ ・ ・ ・ ・ ・ ・Bladder 20a ... One surface 20b ... ..... Other surface 21 .................. Elastic material layer 21A ..・ ・ Center part 21B ・ ・ ・ ・ Peripheral part 21C ・ ・ ・ ・ ・ ・・ ・ Curved reversing part 21a ・ ・ ・ ・ ・ ・ ・ Elastic mounting part 22 ・ ・ ・・ ・ ・ ・ ・ Gas shielding layer 23 ・ ・ ・ ・ ・ ・... Poppets

Claims (1)

[Scope of utility model registration request] 1. An accumulator in which a gas chamber is divided into at least two gas small chambers by disposing the inner shell inside a shell whose internal space is divided into a gas chamber and a liquid chamber by a bladder. Gas guide hole (12
An accumulator characterized in that a porous plug (15) is provided for b).