JPS6220728Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Field of Application) The present invention relates to an accumulator, and more particularly to an accumulator that has excellent sealing performance against filled gas.

(Prior art) Conventionally, as shown in Figs. 1 and 2, an accumulator has been constructed by filling nitrogen gas inside a telescopic rubber bladder b provided in an internal chamber a, and utilizing its compressibility. It is widely known that the structure is such that the pressure of the fluid is stored through the gas filling port d. A structure in which the steel ball e is inserted into the large diameter part d1 and the bolt f is screwed into the large diameter part d1 and fixed and sealed (the first (Fig. 2), or a structure in which an O-ring (g) is attached to the gas filling port (d) and this O-ring (g) is fixed with a bolt (h) and a nut (i) for sealing (Fig. 2).

(Problem to be solved by the invention) However, in these conventional techniques, if the gas filling port d is opened by mistake or the bolts f and h are damaged by external force, the internal chamber a may be damaged. Nitrogen gas, which had been sealed in a compressed state, would suddenly blow out, posing a great danger.

In view of the above points, it is an object of the present invention to provide an accumulator that does not cause the sealed gas to suddenly blow out due to opening of the gas filling inlet or damage to the sealing structure of the gas filling inlet.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention forms the inner wall surface of the upper half of the shell having a gas filling port in the upper end in a spherical shape, and In an accumulator in which a holder for holding a bladder is formed protrudingly formed on an inner wall surface of a peripheral portion, an inverted dish-shaped body having a spherical opposing surface is inserted above the holder so as to be slightly movable in the vertical direction; A ring-shaped sealing member made of rubber-like elastic material is interposed between the inverted dish-shaped body and the shell.

(Function) In the present invention, an inverted dish-shaped body having a spherical opposing surface is inserted above the holder so that it can move slightly in the vertical direction, so there is no space between the shell and the inverted dish-shaped body. A gap will exist. Therefore,
When gas is introduced from the gas sealing port, the gas flows into the internal chamber through this gap. Furthermore, when the gas is completely fed, the pressure in the gap decreases, creating a pressure difference with the internal chamber. Therefore, the inverted dish-like body is pressed upward and moves, but since a rubber-like elastic annular seal member is interposed between the inverted dish-like body and the shell, this seal member is not compressed. becomes. Therefore, the gas in the internal chamber is sealed by this seal member.

(Embodiment) Hereinafter, an embodiment of the present invention will be described with reference to FIG.

In the figure, reference numeral 1 denotes a metal shell having a spherical overall shape, with an inner wall surface 1a of the upper half formed in a spherical shape, and an annular step 1 protruding outward on the side circumference.
b is formed. Further, a gas sealing port 2 is formed in the upper end of the shell 1, and a screw 3 is screwed into the gas filling port 2. An oil port 4 is welded to the lower end of the shell 1. 5 is a holder with a hook-shaped cross section that holds a rubber bladder 6;
It is positioned at the stepped portion 1b of the shell 1, and is formed protruding from the side peripheral inner wall surface 1c of the shell 1. 7 is a metal inverted dish-shaped body having a spherical opposing surface 7a with respect to the inner wall surface 1a of the upper half of the shell 1; It is formed to have a slightly smaller diameter than the inner diameter of the inner wall surface 1c. In addition, when the inverted dish-shaped body 7 is inserted above the holder 5 in the shell 1, it can be moved slightly in the vertical direction. A slight gap 8 is formed between the two. Furthermore, an annular recess 7c is formed in the center of the inverted dish-shaped body 7, and an O-ring 9, which is an annular sealing member made of a rubber-like elastic material, is attached to the annular recess 7c so as to protrude from the opposing surface 7a. It is interposed between the shell 1 and the inverted dish-shaped body 7. In the figure, reference numeral 10 denotes a metal poppet adhesively vulcanized to the bladder 6, which opens and closes a hole 4a formed in the oil port 4.

The usage state of the accumulator configured as above will be explained below.The internal chamber in the shell 1 is divided into an upper chamber 11 and a lower chamber (not shown) with the bladder 6 as a boundary. A suitable amount of nitrogen gas is introduced into the chamber 11 from the gas filling port 2,
Enclose this. At this time, the nitrogen gas passes through the gap between the inner wall surface 1a of the upper half of the shell 1 and the facing surface 7a of the inverted dish-shaped body 7 and reaches the upper chamber 11. After that, the screw 3 is screwed and fixed into the gas filling port 2.
At this time, the pressure in the gap between the shell 1 and the inverted dish-shaped body 7 decreases, creating a pressure difference with the inside of the upper chamber 11.
The inverted dish-shaped body 7 is pushed upward, and the O-ring 9 attached to the annular recess 7c of the inverted dish-shaped body 7 is moved to the shell 1.
The nitrogen gas is compressed between the upper half inner wall surface 1a and the nitrogen gas is sealed. Therefore,
Even if the screw 3 is opened by mistake or the screw 3 is damaged, there is no risk of nitrogen gas spewing out from the gas sealing port 2.

Also, the accumulator with the above configuration is the fourth one.
A shell 1 having the shape shown in the figure is made in advance, and the inverted dish-shaped body 7 fitted with the O-ring 9, the holder 5 with the bladder 6 engaged therein, and the oil port 4 are inserted into it, and then the shell 1 is inserted. Draw the lower half of the oil port 4 and shell 1.
It is manufactured by welding the lower end of the. Further, the O-ring 9 may be mounted by providing an annular recess on the inner wall surface 1a side of the upper half of the shell 1, and may also be mounted by providing an annular recess on both the inner wall surface 1a of the upper half and the inverted dish-shaped body 7. Good too. The screw 3 may be attached to the gas filling port 2 by press fitting instead of screwing.

(Effects of the invention) As described above, the present invention inserts an inverted dish-like body having spherical opposing surfaces above the holder so that it can move slightly in the vertical direction, and between the inverted dish-like body and the shell. Since an annular sealing member made of rubber-like elastic material is interposed in the sealing member, the inverted dish-shaped member is pressed upward by the pressure of the filled gas and moves, compressing the sealing member.
The sealed gas will be sealed by the seal member. Therefore, even if the gas sealing inlet is opened by mistake or the sealing structure of the gas sealing inlet is damaged, the sealed gas will not suddenly blow out. Therefore,
According to the present invention, a safe accumulator with excellent sealing performance can be provided.

[Brief explanation of the drawing]

The drawings show an embodiment of the accumulator of the present invention. Figures 1 and 2 are front cross-sectional views of a conventional accumulator, Figure 3 is a front cross-sectional view of the accumulator according to the present invention, and Figure 4 is a front cross-sectional view of the accumulator of the present invention. It is a front sectional view showing the state before drawing processing. 1... Ciel, 1a... Upper half inner wall surface, 1b...
...Stepped portion, 1c...Inner wall surface of side circumference, 2...Gas filling inlet, 3...Screw, 4...Oil port, 5
... Holder, 6 ... Bladder, 7 ... Inverted dish-shaped body,
7a... Opposing surface, 7b... Lower end circumference, 7c... Annular recess, 8... Gap, 9... O-ring, 10...
Poppet, 11... Upper chamber.

Claims (1)

[Scope of utility model registration request] In an accumulator, the inner wall surface of the upper half of the shell is formed into a spherical shape, and the inner wall surface of the upper half of the shell is formed into a spherical shape, and a holder for holding a bladder is formed protrudingly from the inner wall surface of the side circumferential portion of the shell. An inverted dish-shaped body having a spherical opposing surface is inserted into the shell so as to be slightly movable in the vertical direction, and an annular sealing member made of a rubber-like elastic material is interposed between the inverted dish-shaped body and the shell. An accumulator that is characterized by the ability to