JPH07332304A - Multiple diaphragm type accumulator - Google Patents

Abstract

PURPOSE:To retain expected performance over a long period of time by superposing a gas impermeable diaphragm with a volume larger than the expansion limit of a diaphragm on the gas chamber side divided by an expansible diaphragm, and providing a lubricating layer on both sides of the gas impermeable diaphragm. CONSTITUTION:A gas inlet 2 provided with a gas filling valve is provided on the top of a container main body 1, a liquid inlet/outlet 3, and a valve element 7 which is pushed and separated to open by a spring 6 and seated on a valve seat 5 when a bladder (diaphragm) 8 is pressed is provided on the inlet/outlet 3. A flange 9 provided on the opening side is airtightly fitted to the container main body l by the expansible diaphragm 8, thereby dividing the interior of the container main body 1 into a gas chamber (a) and a liquid chamber (b). In this case, a gas impermeable diaphragm 12 formed by a simple substance of a metallic foil or a synthetic resin sheet (c) or a complex formed by stacking one or plural kinds of synthetic resin sheets where metal is deposited is provided on the inside of the diaphragm 8, and a lubricating layer 14 is uniformly applied to both sides of the gas impermeable diaphragm 12 to enhance durability.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heavy-duty diaphragm type accumulator used for accumulating and buffering a pressure liquid. Specifically, one or more impermeable diaphragms are stacked on the expandable and contractible diaphragm,
A lubrication layer is provided on both sides, and this lubrication layer reduces the frictional resistance to the expansion and bending of the impermeable membrane, and the enclosed gas is instantly heated to a high temperature by adiabatic compression or instantly cooled to a low temperature due to adiabatic expansion. The lubricating layer absorbs the heat energy at the time of reducing the influence on the impermeable membrane, thereby preventing the impermeable membrane from being damaged, and the performance of the accumulator due to gas leakage from the membrane. The present invention relates to a heavy-duty diaphragm type accumulator that does not cause deterioration over a long period of time.

[0002]

2. Description of the Related Art Conventionally, a diaphragm type accumulator, which has been widely used for accumulating and buffering a pressure liquid, has a problem that the diaphragm has a gas permeability and leaks an enclosed gas, resulting in deterioration of performance. As a preventive measure, Japanese Patent Publication No. 40-26, in which an impermeable second partition part is overlaid on the first expandable part
No. 067, using a pressure vessel and a bladder in which a rubber-like elastic material film body and an impermeable film body are laminated.
The accumulator described in Japanese Patent No. 15502 and the bladder type accumulator described in Japanese Patent Application Laid-Open No. 3-223501 using a diaphragm in which a bellows-shaped blocking film is laminated or provided in an elastic layer are known, and these are as planned. When functioning, it is possible to completely eliminate the defect of the diaphragm type accumulator that the performance is deteriorated due to gas leakage from the diaphragm.

However, the above-mentioned Japanese Patent Publication No. 40-26067
In the pressure vessel described in the publication, a large frictional force acts on the folded overlapping portion of the second partition piece and the first partition piece, and the second partition piece only prevents the movement of changing the volume. When the accumulator is operating, the thermal energy when the enclosed gas becomes instantaneously high temperature due to adiabatic compression or instantaneously becomes low temperature due to adiabatic expansion directly affects the second partitioning piece and reduces it. The second partitioning piece is damaged to cause gas leakage due to hardening or curing, and the accumulator described in Japanese Utility Model Laid-Open No. 62-115502 discloses a rubber-like elastic material film body. Using a bladder laminated with an impermeable film body, the bladder type accumulator described in JP-A-3-223501 has a bellows-shaped blocking film laminated on an elastic layer or uses a diaphragm provided therein,
When the bladder or diaphragm expands in the diametrical direction, an expanding force acts on the small-diameter portion of the impermeable membrane or the blocking membrane, and this portion is likely to be damaged, which easily causes gas leakage from the diaphragm. It is insufficient to achieve the purpose of air leak prevention.

[0004]

DISCLOSURE OF THE INVENTION The present invention has been made in view of this situation, and one or a plurality of impermeable diaphragms are superposed on a swellable diaphragm, and a lubricating layer is provided on both surfaces thereof. By providing this, the impermeable membrane reduces the frictional resistance to the motion of expanding and contracting the volume by the lubricating action, and the enclosed gas becomes instantaneously high temperature due to adiabatic compression or instantaneously becomes low temperature due to adiabatic expansion. By absorbing the heat energy at the time of absorption into the lubricating layer to reduce the influence on the impermeable membrane, the impermeable membrane is prevented from shrinking or hardening and damage to the impermeable membrane is prevented. An object of the present invention is to provide a heavy-duty diaphragm type accumulator that does not cause performance deterioration of the accumulator due to gas leakage from the diaphragm over a long period of time.

[0005]

According to the present invention, there is provided a pressure container having a gas inlet and a liquid outlet correspondingly provided, a gas chamber communicating with the gas inlet in the pressure container, and a liquid chamber communicating with the liquid inlet. In a diaphragm type accumulator having an inflatable and deflatable diaphragm for partitioning into, a single or a plurality of impermeable membranes having a volume larger than the expansion limit of the diaphragms are superposed on the gas chamber side. The problem is solved by providing a lubricating layer on both sides of the diaphragm.

[0006]

The heavy-duty diaphragm type accumulator according to the present invention is formed of, for example, an original shape as shown by a chain line in FIG. 1, and is an expandable and separable diaphragm capable of expanding up to the expansion limit shown by a solid line in FIG. Inside, a metal foil, a synthetic resin sheet such as polypropylene, polyethylene, polyvinyl chloride, etc., a composite obtained by laminating one or two kinds of the above-mentioned synthetic resin sheets by metal vapor deposition, or other structure One or a plurality of impermeable membranes formed by a gas permeable material to a volume larger than the expansion limit is coated with a non-Newtonian fluid on both inner and outer surfaces thereof to provide a lubricating layer, and then the membrane is opened through the opening. Also, it is folded and inserted so that it becomes thinner, and its mounting flange is stacked on the mounting flange of the diaphragm.When stacking multiple sheets, even if they are stacked with the same material and structure, Formation may be superimposed different things.

When the impermeable diaphragm is housed as described above, the inflatable diaphragm is housed in the container body, and the mounting flange is supported by the receiving step portion of the container body, and the lid body is inserted into the opening of the container body. , The mounting flange of the expandable diaphragm and the impermeable diaphragm is sandwiched between the lid and the receiving step of the container body, so the ring nut is screwed into the opening of the container body and the lid is closed. When the body is pressurized, the inflatable diaphragm and the impermeable diaphragm are tightly and firmly attached to the container body, and a gas chamber communicating with the gas inlet and a liquid chamber communicating with the liquid inlet / outlet are formed in the container body. Completing the accumulator by forming compartments.

In this accumulator, when the pressure gas is sealed from the sealing valve provided at the gas inlet, the gas first enters the narrowly folded impermeable membrane to expand its volume so that the impermeable membrane can expand. When it comes to be pressed against the diaphragm of
This diaphragm also expands, and at this time, the expandable diaphragm expands by expanding the material such as rubber, whereas the impermeable diaphragm expands by expanding folds and folds. Motor status is different. However, since there is a lubricating layer on both sides of the impermeable membrane and it does not generate frictional force on the contact surface by performing a lubricating action, the impermeable membrane is not damaged and expands to the expansion limit of the diaphragm, A specified volume of pressure gas is filled in to complete the preparation for pressure liquid accumulation.

When the liquid is fed from the liquid inlet / outlet with the completion of the liquid storage preparation, the swellable diaphragm contracts, so that the impermeable membrane is pushed by this and becomes smaller while forming folds and folds. In this case also, when the lubricating action of the lubricating layer formed on the impermeable membrane does not cause frictional resistance, the enclosed gas becomes instantaneously hot due to adiabatic compression or instantaneously cold due to adiabatic expansion. Since the lubricating layer absorbs the heat energy and reduces the effect on the impermeable membrane, the cause of the impermeable membrane shrinking or hardening is eliminated, and the impermeable membrane is damaged. Therefore, the impermeable diaphragm safely contracts together with the diaphragm to the minimum volume, and stably and reliably performs the operation of accumulating a required amount of the pressure liquid in the liquid chamber in the container main body.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a heavy-duty diaphragm type accumulator according to the present invention will be described below with reference to the drawings.

FIG. 1 is a front view, partly omitted, showing a state in which the inflatable diaphragm and the impermeable diaphragm of the heavy-duty diaphragm type accumulator according to the present invention have a maximum volume. FIG. 2 is a vertical cross-sectional front view of the same inflatable diaphragm and impermeable membrane in a state in which they have a minimum volume. FIG. 3 is an enlarged vertical sectional side view of a part of the same as above, in which a lubricating layer is provided on the single impermeable diaphragm and the swellable diaphragm. FIG. 4 is an enlarged cross-sectional plan view of a portion in which the above impermeable membrane is folded and overlapped. FIG. 5 is a partially enlarged vertical side view showing a state where three single impermeable membranes of the same as above are stacked and a lubricating film is provided on each side. FIG. 6 is an enlarged vertical sectional side view of a part of the composite impermeable membrane in which a lubricating film is provided on both surfaces. FIG. 7 is an enlarged vertical cross-sectional side view of a part of a state in which two composite impermeable membranes are superposed and a lubricating film is provided on each surface. FIG. 8 is a vertical sectional front view showing another example of the heavy-duty diaphragm type accumulator.

In FIGS. 1, 2, and 5, reference numeral 1 denotes a container as a main body, and is formed of a rigid material such as steel into a sausage type as shown in FIGS. 1 and 2, or a bowl-shaped pressure resistant structure as shown in FIG. Then, a gas inlet 2 is provided in the upper part and a liquid inlet / outlet 3 is correspondingly provided in the lower part, a gas charging valve 4 is attached to the gas inlet 2, and the liquid inlet / outlet 3 is shown in FIGS. In the embodiment shown, a valve seat 5 and a valve body 7 which is pushed apart from the valve seat 5 by a spring 6 to open and which is pressed against the valve seat 5 and closed when pressed by a bladder described later are provided. In the example, a valve seat 5 is provided, and a valve body 7 is provided which is attached to the bottom of a diaphragm described later on the valve seat 5 and which is opened by contraction of the diaphragm and closed by expansion.

Reference numeral 8 denotes a swellable diaphragm, which is formed of a material such as rubber into a bag shape shown in FIGS. 1 and 2 or a diaphragm shape shown in FIG. 5, and a flange 9 provided on the opening side thereof. The lower side is supported by the receiving step portion 10 provided in the container main body 1,
The lid 11 of the container main body 1 is pressed to the upper side, and the container main body 1 is airtightly attached to the container main body 1. The gas chamber a communicating with the gas inlet 2 and the liquid chamber communicating with the liquid supply / discharge port 3 in the container main body 1. The bladder 8 is formed in the original shape of the volume shown by the chain line in FIG. 1, and when the gas is pressed into the bladder 8 as shown by the solid line in FIG. When the pressure liquid is supplied to the liquid chamber b, it contracts to the contraction limit shown in FIG.
Receives liquid and accumulates therein.

Reference numeral 12 denotes an impermeable membrane provided inside the diaphragm 8, which is a metal foil or a single synthetic resin sheet c of polypropylene, polyethylene, polyvinyl chloride or the like, or one or a plurality of the synthetic resin sheets c. A composite body obtained by laminating metal seeds by metal vapor deposition d as shown in FIGS. 7 and 8, or a bag-shaped diaphragm 8 shown in FIGS. 1 and 2 by an impermeable material having another structure, or FIG. The diaphragm type diaphragm 8 shown in FIG. 2 is formed to have a volume larger than the expansion limit volume, and it is folded into the diaphragm 8 so as to be thinner than the opening of the diaphragm 8 and the mounting flange 13 is attached to the diaphragm. 8 is mounted on the container main body 1 together with the mounting flange 9 of No. 8, and the impermeable membrane 12 makes folds and folds to reduce the volume, and the folds and folds described above are widened. But In order to reduce gas permeation, the thicker the film thickness of the impermeable membrane 12, the better the flexibility, but the thinner the film thickness, the better. Since it is unavoidable that the flexibility deteriorates when trying to obtain a membrane with little gas permeation with a single impermeable membrane, polymerizing a plurality of thin single or composite membranes results in less gas permeation. Therefore, it is possible to obtain a diaphragm that is also excellent in flexibility, and it is possible to prolong the service life of the impermeable diaphragm. Further, it is also possible to mix and stack materials having different materials and configurations.

Reference numeral 14 denotes a lubricating layer provided on both sides of the above-mentioned one or more impermeable membranes 12 as shown in FIGS. 3 to 7, which is a non-Newtonian fluid which stably performs a lubricating action at the application position. Using (trade name: Gold Punch α3000 or one having the same effect) as this and applying it evenly on both sides of the impermeable membrane 12 as shown in FIG. 3, it becomes impermeable through the lubricating layer 14. Even when the outer surface of the diaphragm 12 and the inner surface of the diaphragm 8 are in contact with each other and the inner surface of the impermeable diaphragm 12 is folded and overlapped, the lubricating layer 14 exists between the overlapping portions as shown in FIG. Since it does not cause frictional resistance, the movement of the impermeable diaphragm to expand the volume due to the extension of the folds and folds and the movement to reduce the volume while creating folds and folds are not disturbed by the friction force and are performed smoothly and lightly. In addition, the enclosed gas is instantly heated to a high temperature by adiabatic compression. In addition, when the temperature suddenly becomes low due to adiabatic expansion, the lubricating layer absorbs thermal energy and reduces its effect on the impermeable membrane, causing the impermeable membrane to shrink or harden. As a result, the impermeable membrane is effectively prevented from being damaged.

The lubricating layer 14 is the gas impermeable membrane 1.
Not only on both sides of 2, but also the impermeable membrane 12 of the membrane 8
It is preferable to provide it also on the surface that comes into contact with, because the lubricating action can be further promoted.

[0017]

The heavy-duty diaphragm type accumulator according to the present invention is provided with a lubricating layer on both sides of one or a plurality of impermeable diaphragms having a volume larger than the expansion limit of the expandable diaphragm. Since this impermeable membrane expands the volume due to the expansion of folds and folds in the inflatable diaphragm, or when the volume is reduced while creating folds and folds, the lubricating layer The action reduces the frictional resistance, and also
Since the lubricating layer absorbs thermal energy when the enclosed gas instantly becomes high temperature due to adiabatic compression or instantly becomes low temperature due to adiabatic expansion, the effect on the impermeable membrane is reduced. Since the diaphragm does not shrink or harden, damage to the impermeable bag is prevented, and gas leakage due to this is not caused, so the accumulator retains its desired performance for a long time. It is possible to completely eliminate the defect of the diaphragm type accumulator, which is a special effect.

[Brief description of drawings]

FIG. 1 is a partially omitted vertical sectional front view showing a state in which an inflatable diaphragm and a single impermeable bag of a heavy-duty diaphragm type accumulator according to the present invention have a maximum volume.

FIG. 2 is a partially omitted vertical sectional front view showing a state in which the above-described inflatable and separable diaphragm and one single impermeable membrane have a minimum volume.

FIG. 3 is an enlarged vertical cross-sectional side view of a part of the above-mentioned single single impermeable membrane in which a lubricating layer is provided on both sides and one side of a swellable diaphragm.

FIG. 4 is an enlarged cross-sectional plan view showing a state in which one single impermeable membrane having a lubricating layer on both sides thereof is folded and overlapped.

FIG. 5 is an enlarged vertical cross-sectional side view of a part of a state in which three monolithic impermeable membranes of the same as above are stacked and a lubricating layer is provided on each side.

FIG. 6 is an enlarged vertical cross-sectional side view of a part of a composite impermeable membrane in which a lubricating layer is provided on both sides of the same.

FIG. 7 is an enlarged vertical cross-sectional side view of a part of a state in which two composite impermeable membranes are superposed and a lubricating layer is provided on each side.

FIG. 8 is a vertical cross-sectional front view showing another example of the stacked diaphragm type accumulator.

[Explanation of symbols]

 1 Container Main Body 2 Gas Inlet 3 Liquid Inlet / Outlet a Gas Chamber b Liquid Chamber 8 Separator 12 Impermeable Separator 14 Lubricating Layer

Claims (4)

[Claims] 1. A pressure vessel provided with a gas inlet and a liquid inlet / outlet correspondingly, an expandable / contractible diaphragm for partitioning the inside of the pressure vessel into a gas chamber communicating with the gas inlet and a liquid chamber communicating with the liquid inlet / outlet. In a diaphragm type accumulator having and,
One or a plurality of impermeable membranes having a volume larger than the expansion limit of the diaphragm are superposed on the gas chamber side, and a lubricating layer is provided on both sides of the impermeable diaphragm. accumulator. 2. An overlapping diaphragm type accumulator, wherein one or a plurality of impermeable membranes according to claim 1 is a laminated body. 3. An overlapping membrane type accumulator, wherein the impermeable membrane according to claim 1 and the impermeable membrane according to claim 2 are mixed. 4. A heavy-duty diaphragm type accumulator characterized in that a lubricating layer is also provided on the surface of the diaphragm in contact with the impermeable diaphragm.