JPH08121401A - Accumulator - Google Patents

Abstract

PURPOSE: To provide an accumulator in which bellows are prevented from being extremely extended/shrunk so as to enhance the durability thereof. CONSTITUTION: The accumulator is provided with a shell 1; a port member 2 which is positioned at the opening part of the shell 1 and also has ports 11, 12 communicated with the inside and outside of the shell 1 in the center part of the shell 1; and a bellows 5 which is set inside the shell 1 to divide the inside of shell 1 into a gas chamber 10; and an operation chamber 8 communicated with the ports 11, 12. The port member 2 is divided into an upper half part 3 and a lower half part 4, and a dead space 9 whose diameter is larger than the ports 11, 12 is formed between both half parts 3, 4, and also the valve means 7 which is equipped with valve parts 7b, 7c in the center parts of the upper and lower surfaces of the valve means 7, is arranged to be displaced freely in this dead space 9, so that appropriate fluid can be filled into the operation chamber 8 closed by the valve means 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an accumulator, and more particularly to an accumulator provided with means for preventing abnormal expansion and contraction of bellows.

[0002]

2. Description of the Related Art Conventionally, various types of accumulators used to absorb pulsations of hydraulic pressure and water pressure have been proposed, and for example, the one shown in FIG. Already known.

That is, this accumulator is one of so-called bladder type accumulators, and is a cylindrical shell 21 that is integrally closed, and is attached to the opening of this shell 21, and inside and outside the shell 21 at the center. A substantially disk-shaped port member 22 having a port 36 communicating with each other; an annular spacer 26 mounted between the peripheral surface of the port member 22 and the inner surface of the shell 21; A bellows shape in which an opening peripheral edge portion is sandwiched and fixed between the port member 22 and the spacer 26, and one end that divides the inside of the shell 21 into a sealed gas chamber 30 and a working chamber 28 communicating with the port 36 is closed. The gas chamber 30 is filled with a gas such as nitrogen or air, and the working chamber 28 has a port 36 of the port member 22. Through by water, the working fluid such as oil is made to act.

When the accumulator constructed as described above is connected to a line on which water pressure, oil pressure, etc. act,
The working fluid such as water or oil flowing in the line is the port member 22.
Flows into the working chamber 28 through the port 36 of the bellows 2 and
5 expands and deforms, the gas in the gas chamber 30 is compressed in accordance with the expansion deformation of the bellows 25 to reduce the volume, and when the pressure in the gas chamber 30 and the pressure in the working chamber 28 become equal, The flow from the line to the working chamber 28 is stopped.

When the pressure of the working fluid flowing in the line is lowered from this state, the working fluid in the working chamber 28 is pushed out into the line through the port 36 of the port member 22 by the pressure of the gas in the gas chamber 30. When the pressure in the gas chamber 30 and the pressure in the working chamber 28 become equal, the working fluid stops flowing out from the working chamber 28 to the line.

From such a working fluid line to the working chamber 2
By repeating the inflow to the chamber 8 and the outflow from the working chamber 28 to the line, it is possible to absorb the pulsation and the like of the working fluid flowing in the line.

However, in the conventional accumulator constructed as described above, when the working fluid pressure acts on the working chamber 28, the bellows 25 may be excessively expanded and deformed in the expansion / contraction direction and damaged. . Especially bellows 25
When is expanded and contracted, there is a risk that the valleys and the bent portions of the peaks will be easily damaged.

When the working fluid pressure decreases, the bellows 25 may be excessively compressed by the gas pressure in the gas chamber 30, and the bellows 25 may shear and burst. Particularly, in the bellows type, this breakage easily occurs.

The present invention solves the above-mentioned problems of the conventional ones, and provides an accumulator which can prevent breakage or rupture of the bellows even when the pressure of the working fluid acts extremely. The purpose is to do.

[0010]

In order to solve the above problems, the present invention provides a shell having a port for communicating the inside and the outside at one end, and a gas chamber in the shell and a working chamber communicating with the port. An accumulator having a bellows that divides into a space, the space having a void in the middle of the port, and the first and second portions around the port on both sides of the void.
Valve means having a valve seat, closing the first valve seat when the bellows extends beyond its natural length and closing the second valve seat when compressed to a position where the bellows of the bellows are in pressure contact with each other. Is adopted.

[0011]

According to the present invention, by adopting the above means, when the working fluid acts on the port, the bellows expands or contracts in accordance with the magnitude of the pressure, and the volume of the gas chamber follows the deformation. Shrink or increase. When the pressure of the working fluid acts to expand and contract the bellows more than necessary, the valve means closes the valve seat of the port, thereby preventing further expansion or contraction deformation of the bellows.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention shown in the drawings will be described below. 1 to 3 show a first embodiment of an accumulator according to the present invention, FIG. 1 is a vertical sectional view showing the whole, and FIG. 2 is a view showing a state at the time of maximum inflow of FIG. FIG. 3 and FIG. 3 are explanatory views showing the state at the maximum outflow of the one shown in FIG.

That is, the accumulator shown in this embodiment is a kind of so-called bladder type accumulator, and has a cylindrical shell 1 with one end closed, and is attached to the opening of the shell 1 and has a central portion. A substantially disk-shaped port member 2 having ports 11 and 12 for communicating the inside and outside of the shell 1, an annular spacer 6 provided between the peripheral surface of the port member 2 and the inner surface of the shell 1, and It is provided inside, the opening peripheral portion is sandwiched and fixed between the spacer 6 and the port member 2, and the inside of the shell 1 is divided into a sealed gas chamber 10 and a working chamber 8 communicating with the ports 11 and 12. In addition, a bellows-shaped resin bellows 5 having one end closed and a valve means 7 provided inside the port member 2 and closing the opening of the working chamber 8 are provided.

The port member 2 is vertically divided into two parts, and a working chamber 8 is provided at the center of each of the upper half 3 and the lower half 4.
Ports 11 and 12 leading to the port are bored, and a space 9 having a larger diameter than the ports 11 and 12 is provided between the both half portions 3 and 4.
A first valve seat 17 is provided in a portion of the port 11 facing the void 9 and a second valve seat 17 ′ is provided in a portion of the port 12 facing the void 9 and a valve is provided in the void 9. Means 7 are provided.

The valve means 7 comprises a disk-shaped main body 7a made of an elastic material such as rubber, and substantially hemispherical valve portions 7b and 7c integrally provided at the center of the upper and lower surfaces of the main body 7a. The peripheral portion of the main body portion 7a is fixed to the inner surface side of the space 9.

In the valve means 7, the valve portion 7b on the upper surface abuts on the valve seat 17 of the port 11 of the upper half 3 of the port member 2,
Within the space 9 in which the valve portion 7c on the lower surface side abuts the valve seat 17 'of the port 12 of the lower half portion 4 of the port member 2, the space 9 can be displaced in the vertical direction.

By thus providing the valve means 7 in the space 9, the opening of the working chamber 8 is closed, and an appropriate fluid such as water or oil is sealed in the closed working chamber 8. It is like this.

Next, the operation of the above will be described. First, when the accumulator configured as described above is connected to a line intended to absorb water pressure, pulsation of hydraulic pressure, and the like, the working fluid flowing in the line is transferred to the port 12 of the lower half portion 4.
Fluid flowing into the lower surface side of the valve means 7 via the valve means, the valve means 7 is displaced upward in the figure, and the fluid positioned on the upper surface side of the valve means 7 follows the displacement of the valve means 7 in the upper half portion 3. The bellows 5 moves into the bellows 5 through the port 11 and is combined with the fluid in the bellows 5 to expand and deform the bellows 5. The gas in the gas chamber 10 is compressed following the deformation of the bellows 5 to reduce the volume.

When the pressure of the working fluid flowing in the line is lowered from this state, the pressure of the gas in the gas chamber 10 causes the fluid in the bellows 5 to pass through the port 11 of the upper half portion 3 and the upper surface of the valve means 7. The valve means 7 is pushed to the side, the valve means 7 is displaced downward in the figure, and the fluid located on the lower surface side of the valve means 7 following the displacement of the valve means 7 is in the port 12 of the lower half part 4.
Is extruded into the line via.

By repeating this, it is possible to absorb the pulsation of fluid such as water pressure and hydraulic pressure generated in the line.

When the pressure of the working fluid acting on the port 12 of the lower half portion 4 becomes higher than the set pressure, the valve portion 7b on the upper surface side of the valve means 7 is moved to the port 11 of the upper half portion 3.
By contacting the valve seat 17 of the above, the movement of the fluid in the working chamber 8 is restricted, and the excessive expansion deformation of the bellows 5 is prevented. That is, at the maximum flow of the working fluid volume V _B1 next working fluid flowing to the lower surface side of the valve means 7, the volume of fluid in the working chamber 8 is V _A1, and this V _A1 is bellows 5 by excessive elongation The volume does not break (see Figure 2).

Further, when the pressure of the working fluid acting on the port 12 of the lower half portion 4 becomes lower than the set pressure, the valve portion 7c on the lower surface side of the valve means 7 is connected to the port 12 of the lower half portion 4. By contacting the valve seat 17 ', the movement of the fluid in the working chamber 8 is restricted, and the excessive reduction deformation of the bellows 5 is prevented. That is, at the maximum outflow of the working fluid, the volume of the working fluid remaining on the lower surface side of the valve means 7 becomes V _B2 , and the volume of the fluid in the working chamber 8 becomes V _A2 . This V _A2 is caused by the bellows 5 being excessively reduced. The volume does not break (see Fig. 3).

As described above, in the accumulator according to this embodiment, the valve portion 7 provided on the upper surface side of the valve means 7
By b contacting the valve seat 17 of the port 11 of the upper half part 3, the movement of the fluid located in the working chamber 8 in the direction of extending the bellows 5 is restricted, and the excessive extension of the bellows 5 is prevented. At the same time, the valve portion 7c provided on the lower surface side of the valve means 7 comes into contact with the valve seat 17 'of the port 12 of the lower half portion 4 to reduce the size of the bellows 5 of the fluid located in the working chamber 8. It is possible to regulate the movement and prevent the bellows 5 from being excessively reduced.

Therefore, even if the pressure of the working fluid becomes higher or lower than the set pressure, the bellows 5 will not be excessively expanded and deformed and damaged, or will not be excessively reduced and deformed and ruptured, and durability will be improved. Can be greatly increased.

FIG. 4 shows a second embodiment of the accumulator according to the present invention. The accumulator shown in this embodiment has a rubber rod 15 in the port 11 of the upper half 3 of the port member 2. And the upper end is connected to the ceiling of the bellows 5, and the other end is connected to the port member 2
A rubber having a diameter larger than that of the port 11 of the upper half 3 and the port 12 of the lower half 4 is located in the space 9 formed between the upper half 3 and the lower half 4. A valve portion 16 made of a single material is integrally provided, and the valve means 14 is constituted by the rod 15 and the valve portion 16, and other constitutions are the same as those of the first embodiment.
Since it has the same structure as that shown in the embodiment, detailed description thereof will be omitted.

In the accumulator shown in this embodiment, when the pressure of the working fluid acting on the port 12 of the lower half portion 4 of the port member 2 becomes higher than the set pressure, the valve means 14 is operated. Valve part 1 provided at the lower end of the rod 15
When 6 contacts the valve seat 17 of the port 11 of the upper half 3 of the port member 2, further inflow of the working fluid into the working chamber 8 is blocked, and excessive expansion deformation of the bellows 5 is blocked. It

When the pressure of the working fluid acting on the port 12 of the lower half portion 4 becomes lower than the set pressure, the valve portion 16 provided at the lower end of the rod 15 of the valve means 14 is connected to the port member 2. By coming into contact with the valve seat 17 'of the port 12 of the lower half part 4, the further outflow of the working fluid from the working chamber 8 to the line is prevented, and the excessive reduction deformation of the bellows 5 is prevented. .

Therefore, even if the pressure of the working fluid becomes higher or lower than the set pressure, the bellows 5 will not be excessively expanded and deformed and damaged, or will not be excessively reduced and deformed and ruptured, and durability will be improved. Can be greatly increased.

[0029]

The present invention relates to an accumulator having a shell having a port for communicating the inside and the outside at one end, and a bellows for partitioning the inside of the shell into a gas chamber and a working chamber communicating with the port. There is a void in the middle and first and second valve seats are provided around the ports on both sides of the void, and when the bellows extends beyond its natural length, the first valve seat is closed and The following effects can be obtained by having the valve means for closing the second valve seat when the bellows bellows are compressed to a position where they are pressed against each other.

That is, when the working fluid acts on the port, the bellows expands or contracts in accordance with the magnitude of the pressure, and the volume of the gas chamber is reduced or increased in accordance with the deformation of the bellows. Then, when the structure exceeds the structural expansion / contraction of the bellows, the valve means closes the port to prevent further expansion or contraction deformation of the bellows. Therefore, the bellows may be stretched and deformed excessively,
The bellows can be surely prevented from being broken without being excessively reduced and deformed, and the durability can be greatly improved.

[Brief description of drawings]

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

FIG. 2 is an explanatory view showing a state of the working fluid shown in FIG. 1 at the time of maximum inflow of working fluid.

FIG. 3 is an explanatory diagram showing a state of the working fluid shown in FIG. 1 at the time of maximum outflow.

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

FIG. 5 is a vertical sectional view showing an example of a conventional accumulator.

[Explanation of symbols]

 1, 21 ... Shell 2, 22 ... Port member 3 ... Upper half 4 ... Lower half 5, 25 ... Bellows 6, 26 ... Spacer 7, 14 ... Valve means 7a ... Main body 7b , 7c ...... Valve section 8, 28 ...... Operating chamber 9 ...... Vacancy 10,30 ...... Gas chamber 11, 12, 36 ...... Port 15 ...... Rod 16 ...... Valve section 17 ...... First valve seat 17 ′ …… Second valve seat

Claims (1)

[Claims] 1. A port for communicating the inside and the outside with one end (11,
An accumulator comprising a shell (1) having 12) and a bellows (5) partitioning the inside of the shell (1) into a gas chamber (10) and a working chamber (8) communicating with the ports (11, 12). In the middle of the port (11, 12), the first and second valve seats (17, 17) are provided around the port (11, 12) on both sides of the void (9). ′), The first valve seat (17) is closed when the bellows (5) extends beyond its natural length, and the bellows (5) is compressed to a position where the bellows (5) are pressed against each other. An accumulator having valve means (7, 14) for closing the two valve seats (17 ').