JPH0483903A - Accumulator - Google Patents

Abstract

PURPOSE:To remove high frequency pulsation as well as low frequency pulsation by providing a stop member which restricts movement of a bellows member to extend or contract a piston, in a liquid guide hole for supplying liquid inside the bellows member of the piston positioned on a gas chamber side. CONSTITUTION:A recess portion 13b and a liquid guide hole 13c is formed on the side of a liquid chamber 12B in a piston 13 for partitioning an internal space of a pressure container 11 into a gas chamber 12A and the liquid chamber 12B. One end of the main body of a bellows member 16A is fixed on the side of the gas chamber 12A. On a cap 16B fixed to the other end of the main body of the bellows member 16A, the fore end portion of a stop member 17 is fixed, and the base end portion thereof is inserted into the liquid guide hole 13c and the recess portion 13b, while on the medium portion, stopping recess portions 17a and 17b capable of being engaged with the circumference of liquid guide opening 13c are provided to prevent an excessive expansion and contraction of the main body of the bellows member 16A. Subsequently, high frequency pulsation as well as low frequency pulsation can be removed.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Object of the invention [Field of industrial application] The present invention relates to an accumulator, and in particular to an end surface on the gas chamber side of a piston that divides the internal space of a pressure vessel into a gas chamber and a liquid chamber. By disposing a bellows member on the side and forming a liquid guide hole for supplying liquid into the inside of the bellows member from the end face on the liquid chamber side to the end face on the gas chamber side, high frequency pulsation can be generated in addition to low frequency pulsation. The present invention relates to an accumulator that is made removable.

[Prior Art] Conventionally, in this type of accumulator, the internal space of a pressure vessel is divided into a gas chamber and a liquid chamber by a piston and an O-ring disposed on the circumferential surface of the piston. A device has been proposed in which the pulsation of the liquid is removed by moving a piston according to the pressure difference between the pressure of the supplied liquid and the gas pressure in the gas chamber.

[Problems to be Solved] However, in conventional accumulators, the piston is movably disposed with respect to the internal space of the pressure vessel via an O-ring. There is a disadvantage that the piston movement speed is limited by frictional resistance and the weight of the piston, and as a result, fiil
Although it is possible to remove low frequency pulsations contained in the liquid, there is a drawback that high frequency pulsations cannot be removed.

Therefore, in order to eliminate these drawbacks, the present invention provides a bellows member on the gas chamber side end surface of the piston that divides the internal space of the pressure vessel into a gas chamber and a liquid chamber, and also provides a bellows member on the gas chamber side end surface of the piston that divides the internal space of the pressure vessel into a gas chamber and a liquid chamber. It is an object of the present invention to provide an accumulator which is capable of removing not only low frequency pulsations but also high frequency pulsations by forming liquid guide holes for supplying liquid into the interior of the bellows member toward the chamber side end surface.

(2) Structure of the Invention [Means for Solving the Problems] The means for solving the problems provided by the present invention is as follows. A bellows member (16) is disposed on the gas chamber side end face of the bellows member (16), and liquid guide holes (13b, 13cl) are provided for supplying liquid from the liquid chamber to the inside of the bellows member (16) with respect to the piston.
and a bellows member (16) with respect to the piston.
"accumulator" characterized in that it is provided with a stop member (17; 181) for limiting the contraction of the accumulator.

[Function] The accumulator according to the present invention is an accumulator in which the internal space of the pressure vessel is partitioned by a piston into a gas chamber and a liquid chamber, as specified in the column ``Means for solving problem c'' above, In particular, a bellows member is disposed on the end surface of the piston on the gas chamber side, a liquid guide hole is formed in the piston for supplying liquid from the liquid chamber to the inside of the bellows member, and the bellows member is disposed in the gas chamber side of the piston. Since the stop member is provided to limit the contraction of the member, (1) it functions to remove not only the low-frequency pulsation contained in the liquid but also the high-frequency pulsation; It has the effect of expanding the number of target devices, and as a result, it has the effect of reducing the number of target devices installed.

[Embodiments] Next, preferred embodiments of the accumulator according to the present invention will be described in detail with reference to the accompanying drawings.

However, the examples described below are described to facilitate or accelerate understanding of the present invention, and are not described to limit the present invention.

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

FIG. 1 is a sectional view showing the first embodiment of the accumulator according to the present invention, in which the liquid applied to the liquid chamber 12B is subjected to low-frequency pulsations and This shows the operation when high-frequency pulsation is included.

FIG. 2 is a sectional view showing a second embodiment of the accumulator according to the present invention, in which the liquid supplied to the liquid chamber 12B includes high frequency pulsations in addition to low frequency pulsations. shows the operation.

First, the configuration of a first embodiment of an accumulator according to the present invention will be described in detail with reference to FIG.

This is an accumulator according to the present invention, in which an end member (so-called "oil boat") IIB is disposed at one end of a cylindrical shell IIA, and another end member (so-called "end cover") is disposed at the other end. 11C, and a piston 13 for dividing the internal space of the pressure vessel 11 into a gas chamber 12A and a liquid chamber 12B. The end member 11B has a liquid inlet/outlet hole 11b for attaching a liquid supply pipe (not shown) to supply liquid to the liquid chamber 12B from an appropriate liquid source (not shown).
Power has been created. In addition, a gas (for example, nitrogen gas)
The gas supply hole l is then sealed by the plug 14 being slid through the O-ring 14a.
ie fJ' sweat a is being made. The piston 13 is formed with an arrangement groove 13a for arranging the nozzle 15 on its circumferential surface, and an end face recess 13b located on the liquid chamber 12B side. In addition, the recess 13b
A liquid guide hole 13c is formed for supplying liquid toward the other end surface (that is, the end surface on the gas chamber 12A side). The recess 13b connects the liquid chamber 12B to the liquid guide hole 1.
3c & 3c is rounded in order to guide the liquid in the opposite direction and to accommodate a stopping protrusion 17a at the proximal end of the stopping member 17, which will be described later.

The accumulator chamber also has a gas chamber 12 of the piston 13.
The end face located on the A side (°° gas chamber (111 end face) 1
bellows member main body 16A with one end attached to
A bellows member 16 includes a cap 16B disposed on the other end of the hero member main body 16A, and a distal end attached to the cap 16B and a proximal end connected to the fluid guide hole 13c and the recess. A stop member 17 is inserted into the stop 13b and is engageable around the liquid guide hole 13c with stop projections 17a and 17b to prevent the bellows member main body 16A from being expanded or contracted excessively. It is equipped with

Also, with reference to FIG. 1, the operation of the first embodiment of the accumulator according to the present invention will be described in detail.

When the pressure of the liquid source supplying liquid to the liquid chamber 12B through the liquid inlet/outlet 11b formed in the end face member 11B increases, (il) if the rate of increase is slow (i.e., low frequency pulsation), While the piston 13 resists the gas pressure in the gas chamber 12A, the bellows member 16 and the stop member 17
At the same time, the entire body moves toward the gas chamber 12A side, and the liquid chamber 1
2B, and if the increase rate is rapid (i.e., high frequency pulsation), the cap 16B of the bellows member 16 will move from the recess 13b of the piston 13 to the liquid guide hole 1.
The liquid supplied as shown by arrow A through 3c moves within the gas chamber 12A as shown by arrow B, thereby expanding the liquid chamber 12B. Along with this, the liquid applied from the liquid inlet/outlet 11b is received in the liquid chamber 12B, so that the pressure increase in the liquid source can be alleviated.

On the other hand, the liquid inlet/outlet 1 formed in the end member 11B
When the pressure of the liquid source supplying liquid to the liquid chamber 12B via 1b decreases, if the rate of decrease is slow (i.e. low frequency pulsation), the piston 13 The bellows member 1613 is pressed by pressure.
The cap 16B of the bellows member 16 moves toward the liquid chamber 12B as a whole together with the bellows member 17 to reduce the liquid chamber 12B. The gas pressure moves inside the gas chamber 12A as shown by arrow B2 to reduce the liquid chamber 12B.As a result, the liquid held inside the bellows member 16 flows through the liquid guide hole 13c and the recess. 13b as shown by the arrow A2, and is further discharged from the liquid chamber 12B via the liquid inlet/outlet 11b, so that the pressure reduction in the liquid source can be alleviated.

By repeating the above operations, the present invention can eliminate pressure fluctuations (ie, high frequency pulsations and low frequency pulsations) in the liquid source.

In addition, with reference to FIG. 2, the structure and operation of a second embodiment of the accumulator according to the present invention will be described in detail.

In the second embodiment, instead of the stop member 17, the cap 16B is attached to the end surface of the piston 13 on the gas chamber 12A side (that is, the end surface on the gas chamber side).
It has the same structure and operation as the first embodiment, except that another cylindrical stop member 18 is provided to prevent the second embodiment from coming too close to the second embodiment. By the way, recess 13b
may be removed.

Therefore, in order to simplify the explanation, we will explain the first
By assigning the same reference numerals to the members corresponding to those included in the embodiment, other detailed explanations will be omitted.

effect has.

(3) Effects of the Invention As is clear from the above description, the accumulator according to the present invention has the advantage that the internal space of the pressure vessel is divided into a gas chamber and a liquid chamber by the piston, as specified in the section of [Means for solving problems] above. An accumulator comprising a bellows member disposed on the end face of the piston on the gas chamber side, and a liquid guide hole for supplying liquid to the piston from the liquid chamber to the inside of the bellows member. and is provided with a stop member for restricting the contraction of the bellows member relative to the piston.1i) It has the effect of being able to remove high frequency pulsations in addition to low frequency pulsations contained in the liquid. This has the effect of expanding the FIII pulsation removal function, and as a result, it is possible to reduce the number of installations for FIII target equipment.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a first embodiment of an accumulator according to the present invention, and FIG. 2 is a sectional view showing a second embodiment of an accumulator according to the present invention.

Claims (1)

[Claims] In an accumulator in which the internal space of a pressure vessel is divided into a gas chamber and a liquid chamber by a piston, a bellows member (16) is disposed on the gas chamber side end surface of the piston,
and liquid guide holes (13b, 13) for supplying liquid to the inside of the bellows member (16) from the liquid chamber to the piston.
c) and a bellows member (16) relative to the piston.
), characterized in that it is provided with a stop member (17; 18) for limiting the contraction of the accumulator.