JPH11315802A - Accumulator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide stable performance of an accumulator under a vibrated environment. SOLUTION: A space inside a vessel 1 is divided into two chambers by means of a partition wall 6, one of the chambers being a gas chamber sealing gas, the other being an operation chamber 9 into which fluid can be introduced. The partition wall 6 is a welded bellows 6 prepared by integrally connecting inner and outer diameter portions of a plurality of annular plates 7 with each other due to gas welding, etc., forming bellows. The operation chamber 9 is formed on an inner peripheral side of the welded bellows 6, while the gas chamber 10 is formed on the outer peripheral side. A cylindrical inner wall 12 is arranged on the portion near the inner peripheral surface of the welded bellows 6 inside the operation chamber 9. Direct action of the fluid flowing into the operation chamber 9 to the welded bellows 6 is prevented by the inner wall 12, improving durability of the bellows 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to an automobile, an aircraft,
The present invention relates to an accumulator used as a pulsation attenuator in a hydraulic line of a ship or the like, and particularly to an accumulator using a metal welding bellows for a partition.

[0002]

2. Description of the Related Art There are various types of accumulators used as pulsation attenuators for hydraulic lines of automobiles, aircrafts, ships and the like, and there are known ones as shown in FIG. I have.

[0003] That is, this accumulator is a container 2
1 is divided into two chambers 29 and 30 by a partition wall 26, and one chamber 30 is a gas chamber 30 in which gas is sealed, and the other chamber 29 is a working chamber 29 capable of introducing a fluid. Further, a metal welding bellows 26 is used for the partition wall 26.

The welding bellows 26 is formed by stacking a plurality of annularly punched metal plates 27 and integrally connecting the inner and outer diameters of the adjacent plates 27, 27 by gas welding or the like. In this case, the spring constant is extremely low, and it has the property of easily expanding and contracting.

When the accumulator having the above-described configuration is connected to the hydraulic line, the fluid flowing through the hydraulic line flows into the working chamber 29 through the inflow port 25, and the fluid flows according to the pressure of the fluid at this time. The welding bellows 26 expands and contracts, and the gas chamber 30 follows the expansion and contraction of the welding bellows 26.
Changes the volume (reduces or expands). By repeating such a process inside the accumulator, the pulsation of the fluid flowing through the hydraulic line is attenuated.

However, in the accumulator having the above configuration, when the accumulator is used in a vibrating environment, the mass of the fluid flowing into the working chamber 29 becomes a load repeatedly due to acceleration caused by the vibration, and the welding bellows 26 Will work.

That is, assuming that the specific gravity of the fluid flowing into the working chamber 29 is ρ, the unit length in the axial direction is Δl, and the diameter of the welding bellows 26 is D, the mass of the fluid acting on the welding bellows 26 is ρ × Δl × π × (D / 2) ² ,
The mass obtained by multiplying the mass by the acceleration due to vibration becomes a repeated load and acts on the welding bellows 26.

[0008] Since the repetitive load causes a repetitive stress in the welding bellows 26, when the repetitive load is large, the welding bellows 26 partially undergoes plastic deformation to open the pitch, Problems such as peeling off at the portion where the bellows 26 is fixed to the container 21 and breakage at the welded portion of the welding bellows 26 occur. Further, even when the repetitive load is not so large, the welding bellows 26 may cause an unexpected repetitive displacement.
However, there is a problem that fatigue failure occurs in a short time.

The present invention has been made to solve the above-mentioned problems of the prior art, and when used in a vibrating environment, the mass of the fluid repeatedly acts as a load due to the acceleration due to the vibration and directly acts on the partition. The present invention provides an accumulator capable of preventing a fixed portion or a welded portion of a partition from being damaged at an early stage by preventing the partition wall from being damaged, and providing stable performance over a long period of time even in such an environment. It is the purpose.

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention divides the inside of a container into two chambers by partition walls, one of which is a gas chamber filled with gas, and the other is a gas chamber. In the accumulator, the chamber is configured to be a working chamber capable of introducing a fluid, and the fluid flowing through the hydraulic pressure line is guided into the working chamber to attenuate pulsation of the fluid flowing through the hydraulic pressure line. Means is provided in which a portion of the working chamber near the partition is provided with an inner wall for preventing a fluid flowing into the working chamber from directly acting on the partition. Further, the partition wall employs a means of a metal welding bellows. Further, the inner wall adopts a cylindrical means.

[0011]

According to the present invention, the above means is provided at a portion close to the partition in the working chamber when the mass of the fluid repeatedly acts on the partition due to the acceleration due to vibration. Since the inner wall can receive the repetitive load, the repetitive load does not directly act on the partition wall even when used in a vibration environment.

[0012]

Embodiments of the present invention shown in the drawings will be described below. FIG. 1 shows an embodiment of an accumulator according to the present invention. In this accumulator, a partition 6 is provided in a container 1, the inside of the container 1 is divided into two chambers 9, 10, and one of the chambers is provided. 10 is a gas chamber 10 in which gas is sealed, and the other chamber 9 is a working chamber 9 into which a fluid can be introduced. The partition 6 is made of a metal welding bellows 6.

The container 1 has a cylindrical container body 2, one disk-shaped lid 3 for closing one end opening of the container body 2, and a disk-shaped lid 3 for closing the other end opening of the container body 2. And the other lid 4. A hole 3a penetrating the inside and outside of the container 1 is provided at the center of one lid 3, and a sealing valve 11 for filling gas into a gas chamber 10 in the container 1 is attached to the hole 3a. I have. A hole 4a penetrating the inside and outside of the container 1 is provided at the center of the other lid 4.
A cylindrical inflow port 5 for guiding the fluid into the working chamber 9 in the container 1 is formed integrally with the peripheral portion of a.

The welding bellows 6 is formed by laminating a plurality of annularly punched plates 7 having a corrugated cross section, and integrally connecting the inner and outer diameters of the adjacent plates 7, 7 by gas welding or the like. The whole is formed in a bellows shape.

The welding bellows 6 has one end opening fixed to the other lid 4 of the container 1 by means such as welding or fitting. The opening at the other end of the welding bellows 6 is closed by a disk-shaped lid 8, and when the lid 8 comes into contact with one of the lids 3 of the container 1 during expansion and contraction, the welding bellows 6
Is limited.

A working chamber 9 into which fluid can be introduced is formed on the inner peripheral side of the welding bellows 6, and a gas chamber 10 capable of filling gas is formed on the outer peripheral side of the welding bellows 6. ing. Fluid can flow into the working chamber 9 through the inflow port 5. A gas such as nitrogen gas is sealed in the gas chamber 10 through a sealing valve 11.

The inner wall 12 is provided with the welding bellows 6 in the working chamber 9.
A cylindrical shape provided at a portion adjacent to the inner peripheral surface of the container, and one end opening thereof is welded to the other lid 4 of the container 1,
They are fixed by means such as fitting. The inner wall 12 is formed slightly shorter than the normal length of the welding bellows 6. Therefore, welding bellows 6
Is surrounded by the inner wall 12 from the fixing portion to the container 1 to a predetermined position in the extending direction.

The accumulator configured as described above is connected to a hydraulic line of, for example, an automobile, an aircraft, a ship, or the like, so that fluid flowing through the hydraulic line can be introduced into the working chamber 9 through the inflow port 5. I do.

When pulsation occurs in the fluid flowing through the hydraulic pressure line, the fluid in the hydraulic pressure line flows into the working chamber 9 through the inflow port 5, and the welding bellows 6 according to the fluid pressure at this time. Expands and contracts, and the gas chamber 10 changes (reduces or expands) the volume following the expansion and contraction of the welding bellows 6. By repeating such a process inside the accumulator, the pulsation of the hydraulic pressure line is attenuated.

In this case, the fluid pressure of the fluid flowing into the working chamber 9 acts on the welding bellows 6 via the inner wall 12, so that even when used in a vibration environment,
The mass of the fluid does not directly act on the welding bellows 6 as a repeated load due to acceleration due to vibration.

Therefore, the repetitive load acts directly on the welding bellows 6 to increase the pitch of the welding bellows 6, peel off at a portion where the welding bellows 6 is fixed to the container 1, or remove the welding bellows 6. No breakage occurs in each weld. As a result, even when the welding bellows 6 is used in a vibration environment, the welding bellows 6 can be stably expanded and contracted, so that pulsation and the like of the hydraulic line can be effectively attenuated.

The closer the inner wall 12 is located to the inner peripheral surface of the welding bellows 6, the more effectively the welding bellows 6 can be protected from repeated loads. Problems such as hindering smooth movement may occur, and in order to prevent such problems, it is also effective to form the tip of the inner wall 12 into a rounded or tapered shape.

Hereinafter, results of performance tests of the accumulator according to the present invention and the conventional accumulator will be described. <Test result 1> In the conventional accumulator, 100c
In the state in which the florinate of c was absorbed, all of the fibers were damaged by the vibration of 30 Grms, but the accumulator according to the present invention did not break 100% under the same conditions. <Test result 2> In the conventional accumulator, 3000
5.2Grms with cc of Fluorinert absorbed
However, the accumulator according to the present invention did not break 100% under the same conditions. From the above test results, it can be clearly understood that the accumulator according to the present invention exhibits excellent performance in a vibration environment.

[0024]

According to the present invention, as described above, the fluid pressure of the fluid flowing into the working chamber acts on the partition via the inner wall and does not directly act on the partition. Even when used in a vibrating environment, repeated loads due to vibration no longer act directly on the bulkhead,
The repeated stress does not act on the partition. Therefore, even in a vibration environment, there is no possibility that breakage or the like will occur in a fixed portion or a welded portion of the partition, so that the partition can be displaced stably even in such an environment, and the The generated pulsation can be effectively attenuated.

[Brief description of the drawings]

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

FIG. 2 is a schematic longitudinal sectional view showing an example of a conventional accumulator.

[Explanation of symbols]

 1, 21 Container 2 Container main body 3 One lid 3a, 4a Hole 4 Other lid 5, 25 Inflow port 6, 26 Weld bellows 7, 27 Plate 8 … Lid 9, 29… Working chamber 10, 30… Gas chamber 11… Sealed valve 12… Inner wall

Claims (3)

[Claims] 1. The container is divided into two chambers by a partition wall,
One of the chambers is a gas chamber filled with gas, and the other chamber is a working chamber capable of introducing a fluid, and the fluid flowing through the hydraulic line is guided into the working chamber so that the fluid flowing through the hydraulic line is In an accumulator adapted to attenuate pulsation, etc., an inner wall for preventing a fluid flowing into the working chamber from directly acting on the partition is provided in a portion of the working chamber adjacent to the partition. Accumulator with features. 2. The accumulator according to claim 1, wherein said partition is a metal welding bellows. 3. The accumulator according to claim 1, wherein the inner wall has a cylindrical shape.