JPH0566301U - accumulator - Google Patents

Abstract

(57) [Summary] [Purpose] The structure was designed to prevent damage to the flexible membrane due to abnormal compression of the flexible membrane due to leakage of pressure gas. A manifold connected to a gas chamber (3) and a liquid chamber (4) side divided by a flexible film body (2) made of a rubber-like elastic material arranged inside a hollow cell (1) ( 5) Inside the fluid chamber (4), which is provided with a valve seat and communicates with the liquid chamber (4), and the piston chamber (7).
A poppet (8) for opening and closing the fluid flow path (6) and a piston (9) connected to the poppet (8) and sliding in the piston chamber (7).

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an accumulator used for coping with a pressure fluctuation generated in a working fluid in a hydraulic device using a working fluid having a high pressure. The present invention relates to a structure of an accumulator in which a hollow cell having a membrane is divided into a gas chamber and a liquid chamber, a high pressure gas is sealed in the gas chamber, and a working fluid is introduced into the liquid chamber side.

[0002]

[Prior Art]

 In hydraulic equipment that uses the pressure of the working fluid, in order to prevent troubles due to the difference between the supply amount of the mechanism that applies pressure to the working fluid and the usage amount of the working fluid on the side that uses the pressure, A flexible membrane that is made of elastic material and has a substantially dish shape or a substantially bag shape divides the inside of the hollow cell into a gas chamber and a liquid chamber. The working fluid is introduced into the gas chamber, and the accumulator is configured to respond to the fluctuation of the usage amount of the working fluid by the compression and expansion of the pressure gas in the gas chamber.

[0003]

[Problems to be solved by the device]

 In the conventional accumulator described above, since the membrane made of rubber-like elastic material cannot avoid gas permeability, it is enclosed in the gas chamber formed by the flexible membrane arranged inside the cell. The high-pressure gas penetrates into the flexible film body and leaks to the liquid chamber side, resulting in a decrease in the amount of the pressurized gas enclosed in the gas chamber, and as a result, the flexible film body is forced to undergo severe deformation. It may cause troubles such as damage due to damage.

In order to prevent the flexible membrane from being damaged due to the reduction of the high-pressure gas, a relief valve that operates when the pressure of the working fluid rises abnormally is arranged in the working fluid pipe, The only way to do this was to check the filling pressure in the gas chamber and perform maintenance.

[0005]

[Means for solving problems]

 The present invention has been made in consideration of the above-mentioned problems in the reed valve according to the related art. A flexible membrane made of a rubber-like elastic material is disposed inside a hollow cell to form a gas chamber. And a fluid chamber is formed, and a fluid passage communicating with the liquid chamber and a piston chamber are formed inside the manifold connected to the liquid chamber side, and are separated from or in contact with the valve seat. It comprises a poppet that opens and closes the fluid flow path, and a piston that is connected to the poppet and slides in the piston chamber while the opposite side is pressed by gas pressure.

[0006]

[Action]

 In the accumulator according to the present invention having the above structure, the flexible membrane disposed inside the hollow cell operates with the amount of gas enclosed in the gas chamber divided from the liquid chamber side reduced. When the fluid pressure becomes extremely high, the poppet inserted in the manifold connected to the liquid chamber side contacts the valve seat of the fluid flow passage to stop the abnormal pressure rise in the liquid chamber.

[0007]

【Example】

 In the embodiment shown in FIG. 1, a flexible film body 2 made of a rubber-like elastic material is placed inside an empty cell 1 to form a gas chamber 3 and a liquid chamber 4. A fluid passage 6 and a piston chamber 7 that are provided with a valve seat and communicate with the liquid chamber 4 are formed inside the manifold 5 that is connected to the fourth side, and the poppet 8 and the poppet that are separated from and in contact with the valve seat of the fluid passage 6 are formed. A piston 9 that is connected to 8 and slides in the piston chamber 7 and a spring 10 that presses the piston 9 are inserted.

In the embodiment shown in FIG. 1, the pressure of the working fluid is remarkably increased in a state where the amount of the pressure gas filled in the gas chamber 3 is reduced, and the pressing force against the piston 9 causes the urging force of the spring 10 to increase. When exceeding, the poppet 8 inserted in the manifold 5 connected to the liquid chamber 4 side comes into contact with the valve seat of the fluid flow path 6 to stop the abnormal rise in pressure in the liquid chamber 4.

When the pressure of the gas sealed in the gas chamber 3 is P ₁ , the minimum working pressure of the working fluid is P ₂ and the maximum working pressure is P ₃ , the elastic force of the spring 10 is The poppet 8 is set to block the fluid flow path 6 when the pressure rises from P ₂ to P ₃ = 4P ₁ .

[0010]

[Effect of the device]

 As described above, the accumulator according to the present invention divides the inside of the hollow cell into the gas chamber and the liquid chamber by the flexible film body made of the rubber-like elastic material, and is connected to the liquid chamber side. A fluid flow path and a piston chamber are formed inside the container, the fluid flow path communicating with the liquid chamber and the piston chamber are formed. The poppet opens and closes the fluid flow path by separating from and in contact with the valve seat, and the piston connected to the poppet. By having a piston structure that slides in the chamber and is pressed by gas pressure from the opposite side, the amount of gas enclosed in the gas chamber due to permeation into the flexible membrane is reduced and the working fluid When the pressure rises significantly, the poppet inserted in the manifold connected to the liquid chamber side comes into contact with the valve seat of the fluid flow path to stop the abnormal pressure rise in the liquid chamber. Since the damage inside due to loss of pressure gas which has not been avoided in a conventional accumulator which is not attached to arranged manifold poppet flexible membrane body can be effectively prevented.

[0011]

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention.

[Explanation of symbols]

 1 Cell 2 Flexible Membrane 3 Gas Chamber 4 Liquid Chamber 5 Manifold 6 Fluid Flow Path 7 Piston Chamber 8 Poppet 9 Piston 10 Spring

Claims (1)

[Scope of utility model registration request] 1. A flexible membrane (2) made of a rubber-like elastic material is arranged inside a hollow cell (1) to form a gas chamber (3) and a liquid chamber (4), The liquid chamber (4)
Inside the manifold (5) connected to the side, a fluid channel (6) communicating with the liquid chamber (4) and a piston chamber (7)
And a poppet (8) that forms a bubble sheet in the fluid flow path (6) to open and close the bubble sheet, and slides in the piston chamber (7) while being connected to the poppet (8). An accumulator having a piston (9) on the opposite side pressed by gas pressure.