JP2009236137A - Metal bellows type accumulator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a metal bellows type accumulator having improved durability and safety by releasing liquid from a liquid chamber to prevent the deformation of a metal bellows and damage thereto when the pressure of the liquid in the liquid chamber is increased with fire in the zero-down condition that the metal bellows is shrunk. <P>SOLUTION: The metal bellows type accumulator comprises a seal means consisting of an elastic material seal member in which a metal reinforcing ring is embedded, and a holder holding the seal member on the side of a cap in an axially movable manner, and a communication means for communicating the liquid chamber with an introduction hole when the seal member is burnt down to abut on the reinforcing ring. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

The present invention relates to a metal bellows type accumulator.
The present invention also relates to a metal bellows accumulator that partitions a variable volume gas chamber in a shell with a metal bellows and accumulates hydraulic fluid.
Furthermore, the present invention relates to a metal bellows accumulator useful for accumulating hydraulic fluid of a hydraulic source of a control device such as a vehicle using hydraulic pressure, such as an anti-lock brake device, at a high pressure.

Conventionally, a metal bellows type accumulator shown in FIGS. 5 to 7 is known.
In this kind of metal bellows type accumulator, a metal material bellows 40 is disposed in a metal material shell 10.

One end of the metal bellows 40 is welded and integrated with an annular flange portion 100 provided at the lower end of the shell body 120.
On the other hand, the other end of the metal bellows 40 is closed by the cap 50 being fixed by welding.

As a result, the inside of the shell 10 is partitioned into a gas chamber 20 and a liquid chamber 30.
Nitrogen gas, inert gas, or the like is sealed in the gas chamber 20 from an injection hole 110 located in the upper part of the figure. The injection hole 110 is closed by a gas plug 130 after the gas is sealed.
As a result, the gas chamber 20 is filled with a gas having a predetermined pressure.

On the other hand, the liquid chamber 30 communicates with an introduction hole 60 for introducing a liquid located in the lower part of the figure.
An external working fluid is guided to the liquid chamber 30 through the introduction hole 60.
Further, an annular seal member 70 made of an elastic material is disposed inside the shell 10 of the introduction hole 60 so as to surround the introduction hole 60.

The seal member 70 is in sealing contact with the cap 50 in order to prevent the bellows from contracting excessively when the pressure of the working fluid is greatly reduced rather than the gas pressure.
As a result, the liquid in the liquid chamber 30 and the liquid on the introduction hole 60 side are blocked.
On the other hand, a damping ring 90 is held on the cap 50 in order to suppress the radial deflection of the metal bellows 40 and guide the axial direction in the shell 10 when the metal bellows 40 is extended or contracted. ing.

  As shown in FIG. 6, when the lip portion 710 comes into contact with the cap 50, the conventional seal member 70 loses escape from the liquid pressure on the liquid chamber 30 side. Is affected.

As a result, as shown in FIG. 7, the tip of the lip 710 is deformed so as to be sandwiched in the gap 81 between the inner peripheral end of the oil port 80 and the cap 50.
For this reason, when the cap 50 is further lowered to the oil port 80 side, a problem that the lip portion 710 is damaged is caused.
Furthermore, when the pressure of the liquid in the liquid chamber 30 increases while the tip of the lip portion 710 is in sealing contact with the cap 50, the tip of the lip portion 710 is further strongly pressed against the cap 50, Liquid pressure is never released.
In such a state, when the accumulator encounters a fire or the like, the pressure of the liquid in the liquid chamber 30 rises excessively and is dangerous.
In order to avoid such a risk, a measure has been proposed in which a groove is provided in a metal reinforcing ring embedded in a seal member to discharge fluid to the outside of the accumulator (see Patent Document 1 below).
However, due to the molten and burnt state of the seal member, the function of the groove is not sufficiently exhibited, and it has been insufficient as a measure for discharging the fluid.

JP 2006-10005 A JP 2007-187229 A JP 2000-356201 A JP 2007-218352 A

  The present invention has been made in view of such problems, and in the 0-down state in which the metal bellows contracts, the liquid in the liquid chamber is released when the pressure of the liquid in the liquid chamber increases due to a fire or the like. Then, it aims at providing the metal bellows type accumulator which prevented the deformation | transformation and damage of metal bellows, and improved durability and safety | security.

The metal bellows type accumulator of the present invention is arranged in a shell and the shell, one end is fixed to the shell side, and the other end is closed by a cap, thereby separating the shell into a gas chamber and a liquid chamber. A metal bellows, an oil port arranged to surround an introduction hole for introducing a liquid into the liquid chamber, and defining a shrinkage limit of the metal bellows, and between the oil port and the cap In the metal bellows type accumulator, which is arranged in a seal means for sealing between the liquid chamber and the introduction hole,
The sealing means is composed of an elastic seal member in which a reinforcing ring made of a metal material is embedded, and a holder that holds the seal member on the cap side so as to be axially movable, and the seal member is burned out. At this time, a communication means is provided in contact with the reinforcing ring to communicate the liquid chamber side and the introduction hole side.

The present invention has the following effects.
According to the metal bellows type accumulator of the invention according to claim 1, when the pressure of the liquid in the liquid chamber increases due to a fire or the like, the liquid in the liquid chamber is released to prevent deformation and damage of the metal bellows, The durability and safety of the accumulator can be secured.
According to the metal bellows type accumulator of the second aspect of the present invention, when the seal member is burned down due to a fire or the like, the flow path for opening the liquid in the liquid chamber by supporting the reinforcing ring embedded in the seal member with the protrusion Can be secured.
Furthermore, according to the metal bellows type accumulator of the third aspect of the present invention, the reinforcing ring embedded in the seal member is supported by the plurality of projections arranged at equal intervals, so that the flow path for opening the liquid in the liquid chamber Can be secured more reliably.
Furthermore, according to the metal bellows type accumulator of the invention described in claim 4, the axial movement of the seal member can be held without being restricted.

Further, according to the metal bellows type accumulator of the invention described in claim 5, since the axial protrusion is formed at the tip of the bent portion of the holder, it can be easily processed by sheet metal forming.
According to the metal bellows type accumulator of the invention described in claim 6, since the reinforcing ring embedded in the sealing member is supported by the plurality of axially arranged protrusions, the liquid in the liquid chamber is released. The flow path can be secured more reliably.

According to the metal bellows type accumulator of the invention described in claim 7, since the communication means is formed by cutting from the tip of the bent portion of the holder to the liquid chamber, the processing is easy and economical. .
Moreover, according to the metal bellows type accumulator of the invention described in claim 8, the flow path for opening the liquid in the liquid chamber can be ensured more reliably.
According to the metal bellows type accumulator of the invention described in claim 9, the pressure of the liquid in the liquid chamber at the normal time can be surely confined.

Hereinafter, the best mode for carrying out the present invention will be described.
A metal bellows type accumulator according to the present invention will be described with reference to FIGS.
FIG. 1 is a longitudinal sectional view of a metal bellows accumulator according to the present invention.
FIG. 2 is a partially enlarged view of FIG.
FIG. 3 is a view showing a state in which the seal member of FIG. 2 is burned out and the protrusion and the reinforcing ring are in contact with each other.
FIG. 4 is a diagram showing another embodiment similar to FIG.

1 and 2, the metal shell 1 includes a cup-shaped main body 12 and an oil port 8 provided with a fluid introduction hole 6 that closes the lower portion of the main body 12 in the figure.
The flange portion 10 of the oil port 8 is integrated with the main body 12 by welding.

On the other hand, a metal bellows 4 is disposed in the shell 1.
As this kind of metal material bellows 4, a metal thin film having a predetermined film pressure is deposited by plating on the core surface in which crests and troughs continuous in the circumferential direction are repeatedly formed. Electrodeposited bellows obtained by dissolving and removing, molded bellows formed by plastic processing of thin metal tubes, or a number of thin metal disks having inner peripheral holes arranged adjacent to each other in the axial direction Also, a welded bellows or the like in which the outer peripheral edges are alternately welded is employed.
One end of the metal bellows 4 is welded and integrated with an annular flange portion 10 provided in the shell 1.

On the other hand, the other end of the metal bellows 4 is closed by the cap 5 being fixed by welding.
As a result, the inside of the shell 1 is partitioned into a gas chamber 2 and a liquid chamber 3.
The gas chamber 2 is filled with nitrogen gas, inert gas, or the like from an injection hole 11 located in the upper part of the figure.
The injection hole 11 is closed with a gas plug 13 after sealing the gas.
As a result, the gas chamber 2 is filled with a gas having a predetermined pressure.

On the other hand, the liquid chamber 3 communicates with an introduction hole 6 provided in the oil port 8 for introducing a liquid.
An external working fluid is guided to the liquid chamber 3 through the introduction hole 6.
Further, a sealing means 7 for sealing between the liquid chamber 3 and the introduction hole 6 is arranged between the oil port 8 and the cap 5.

The sealing means 7 includes a rubber-like elastic material sealing member 71 and a holder 72 that holds the sealing member 71 on the cap 5 side so as to be movable in the axial direction.
Further, the holder 72 supports the outer peripheral edge portion of the seal member 71 by the bent portion 77.
Further, the seal member 71 includes an annular first seal protrusion 73 that is in sealing contact with the oil port 8 and an annular second seal protrusion 74 that is in sealing contact with the cap 5, and the second seal protrusion 74 is a first seal. The structure is located on the outer peripheral side of the protrusion 73.

A through hole 75 is provided at the center of the seal member 71, and a reinforcing ring 76 made of a plate-like metal material is embedded therein.
And the cross-sectional shape of the 1st seal protrusion 73 and the 2nd seal protrusion 74 is exhibiting substantially trapezoid.
On the other hand, the holder 72 supports the outer peripheral edge portion of the seal member 71 by its bent portion 77 so as to be movable in the axial direction.
Further, when the seal member 71 is burned out, a communication means 0 is provided which contacts the embedded reinforcing ring 76 and connects the liquid chamber 3 side and the introduction hole 6 side.
The communication means 0 is a plurality of protrusions 01 provided on the end face of the oil port 8 at equal intervals.
When the seal member 71 is burnt out due to a fire or the like, as shown in FIG. 3, the plurality of protrusions 01 abut against the reinforcing ring 76 to secure a passage 05 that connects the liquid chamber 3 side and the introduction hole 6 side. .

FIG. 4 shows another embodiment of the present invention.
The communication means 0 in this embodiment is an axial projection 02 formed at the tip of the bent portion 77 of the holder 72.
A plurality of the axial projections 02 are provided at equal intervals between the end face of the oil port 8 and the reinforcing ring 76.
Further, even if the communication means 0 is only the notch 03 reaching the liquid chamber 3 from the end of the bent portion 77 of the holder 72, it is possible to secure the passage 05 that connects the liquid chamber 3 side and the introduction hole 6 side. It is.
However, as shown in FIG. 4, a mode in which the axial protrusion 02 and the notch 03 are combined is preferable in terms of reliably securing the passage 05 that connects the liquid chamber 3 side and the introduction hole 6 side.

  On the other hand, in order to suppress radial deflection of the metal bellows 4 and guide the axial direction in the shell 1 during the expansion / contraction operation of the metal bellows 4, the cap 5 has a damping ring 9. Is held.

Further, a protection ring 14 made of the same material as that of the vibration damping ring 9 is fitted in a valley 41 between the metal bellows 4 and the flange 10.
Further, as the material of the seal member 71, a rubber-like elastic body such as EPDM, NBR, or CR, or a resin-like elastic body such as fluororesin or polyethylene resin is appropriately selected and used depending on the atmosphere used. A rubber-like elastic material is preferable from the viewpoint of performance.

  Since the reinforcing ring 76 is entirely covered with the elastic material, there is no risk that the adhesion interface between the reinforcing ring 76 and the elastic material is eroded by the working fluid.

  Further, the present invention is not limited to the best mode for carrying out the invention described above, and various other configurations can be adopted without departing from the gist of the present invention.

It is a longitudinal cross-sectional view of the metal bellows type accumulator which concerns on this invention. It is the elements on larger scale of FIG. It is a figure of the state which the seal member of FIG. 2 burned down and the protrusion and the reinforcement ring are contacting. It is the figure which showed the other Example similarly to FIG. It is a longitudinal cross-sectional view of the metal bellows type accumulator which concerns on a prior art. It is the elements on larger scale of FIG. It is the figure which showed the state by which the lip | rip part of FIG. 6 was pinched | interposed into the gap.

Explanation of symbols

0 communication means 01 protrusion 02 axial protrusion 03 cut 05 passage 1 shell 2 gas chamber 3 liquid chamber 4 metal bellows 5 cap 6 introduction hole 7 sealing means 8 oil port 9 damping ring 10 flange portion 11 injection hole 12 body 13 gas plug 14 protection ring 71 seal member 72 holder 73 first seal projection 74 second seal projection 75 through-hole 76 reinforcing ring 77 bent portion

Claims (9)

The shell (1) is disposed in the shell (1), one end is fixed to the shell (1) side, and the other end is closed by the cap (5), thereby the shell (1) is closed to the gas chamber. The metal bellows (4) separated into (2) and the liquid chamber (3) and the introduction hole (6) for introducing the liquid into the liquid chamber (3) are disposed so as to surround the metal bellows (4). An oil port (8) that defines the shrinkage limit of the material bellows (4), and is disposed between the oil port (8) and the cap (5), and the liquid chamber (3) and the introduction hole (6 In a metal bellows type accumulator comprising sealing means (7) for sealing between
The sealing means (7) includes an elastic sealing member (71) in which a metal reinforcing ring (76) is embedded, and the sealing member (71) is movable toward the cap (5) so as to be axially movable. When the seal member (71) is burned out, it comes into contact with the reinforcing ring (76), and the liquid chamber (3) side, the introduction hole (6) side, A metal bellows type accumulator characterized in that a communication means (0) is provided for communicating with each other.   The metal bellows accumulator according to claim 1, wherein the communication means (0) is a protrusion (01) provided in the oil port (8).   The metal bellows type accumulator according to claim 2, wherein a plurality of the protrusions (01) are provided on the end face of the oil port (8) at equal intervals.   The metal bellows type according to any one of claims 1 to 3, wherein the holder (72) supports an outer peripheral edge portion of the seal member (71) by a bent portion (77) thereof. accumulator.   The metal bellows type accumulator according to claim 4, wherein the communication means (0) is an axial protrusion (02) formed at a tip of the bent portion (77) of the holder (72).   6. The metal bellows type according to claim 5, wherein a plurality of the axial protrusions (02) are provided equally between the end face of the oil port (8) and the reinforcing ring (76). accumulator.   The metal according to claim 4, wherein the communication means (0) is a cut (03) that reaches the liquid chamber (3) from an end of the bent portion (77) of the holder (72). Bellows type accumulator.   The metal bellows accumulator according to claim 5 or 7, wherein the communication means (0) is a combination of the axial protrusion (02) and the notch (03).   The metal bellows accumulator according to any one of claims 1 to 8, wherein the elastic material is a rubber-like elastic material.

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