JPH0430401Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to an accumulator used to prevent pulsations that occur when a liquid is transferred at a vacuum pressure below atmospheric pressure using a pump. be.

[Prior Art] Generally, a pump is used to transfer a liquid at a vacuum pressure below atmospheric pressure. It is well known that pressure pulsations occur due to the discharge operation.

Conventional accumulators usually pressurize a pressurized compressible gas such as nitrogen gas into one of the compartments formed by a diaphragm made of a bladder or bellows to prevent pulsation of the liquid on the line side. This type of product is effective only when the liquid side is at atmospheric pressure or above, and if the liquid side is at below atmospheric pressure, that is, under vacuum, even if pressurized At present, even if compressible gas is pressurized and sealed, the function of preventing pulsation cannot be achieved.

[Problems to be solved by the invention] For this reason, in conventional accumulators, even if the sealing side of the pressurized compressible gas is sealed in vacuum instead of pressurized, the pulsation prevention range is limited to the sealed area. Since it is greatly influenced by the sealing pressure and the volume on the sealing side, the sealing volume changes greatly depending on subtle changes in the pressure to be sealed and subtle differences in the rigidity of the diaphragm. It was difficult to set the sealing pressure and the sealing side volume in stages, and there was a problem that it could not be used in actual use.

[Purpose of the invention] The present invention was made under the above circumstances, and its purpose is to provide an accumulator that can prevent pulsation under vacuum. be.

[Means for solving the problems] In order to solve the above problems, the present invention has the following features:
Two large and small bellows with different diameters are provided concentrically on the end plate, a lid plate that is shared by both bellows is sealed to the free end of both bellows, and a position is freely adjustable opposite to the lid plate. A regulating member is provided, and vacuum line pressure is introduced into one of the two compartments defined between the two bellows and on the inner periphery of the small-diameter bellows, and the line pressure is introduced into the other compartment. The structure is such that a compressible gas is pressurized and sealed in a compartment.

[Function] In the accumulator of the present invention, the free ends of the large-diameter bellows and the small-diameter bellows, which are arranged concentrically and form two compartments, are sealed to a common cover plate, so that one The line pressure of the vacuum introduced into the compartment and the pressure of the compressible gas sealed in the other compartment interfere with each other, thereby absorbing the pulsations in the line pressure. In addition, the regulating member facing the cover plate regulates the extension of both bellows by adjusting the distance from the cover plate, and prevents excessive extension of the bellows when filling compressible gas or releasing line pressure. This is to prevent

[Embodiment] The present invention will be described below with reference to an illustrated embodiment.

FIG. 1 schematically shows an accumulator according to the present invention, in which two bellows 2 and 3 with different diameters are provided concentrically on an end plate 1. A shared lid plate 5a is sealed to the free end of the lid 3. A first compartment 4 is defined between both bellows 2 and 3, and a second compartment 5 is defined on the inner periphery of the small-diameter bellows 3. The vacuum liquid W on the line side is introduced from an inlet 21 provided in the end plate 1 and discharged from the discharge port 22. A pressurized compressible gas G is sealed through a sealing port 23 provided at 1, and is sealed under pressure by a sealing valve 6.

Then, on the end plate 1, the bellows 2,
A restraining mechanism 7 is provided to prevent over-extension of the end plate 3, and this restraining mechanism 7 includes a support rod 8 which is erected and fixed on the end plate 1, and an L-shaped extension from the upper end of the support rod 8. It consists of a regulating member 9 that overhangs and faces the lid plate 5a, and by adjusting the height of the regulating member 9, the stroke width of the bellows 2, 3 is adjusted to prevent overextension, and the second compartment is The sealing side volume, which is 5, can be set.

In the above embodiment, the first compartment 4 is on the introduction side of the vacuum liquid W, and the second compartment 5 is on the pressure sealing side where the pressurized compressible gas G is sealed. However, it is not limited to this in any way,
For example, by changing the number of holes formed in the end plate 1, the first compartment 4 can be placed on the pressure sealing side where the pressurized compressible gas G is sealed, and the second compartment 5 can be placed on the pressure sealing side where the pressurized compressible gas G is sealed, and the second compartment 5 can be placed on the vacuum side. It may also be used as the liquid W introduction side.

In addition, it goes without saying that the present invention can be modified in various ways without changing the gist of the invention.

[Effects of the invention] As is clear from the above explanation, the present invention forms two compartments by two large and small bellows whose free ends are sealed to a common lid plate, and The line pressure of the introduced vacuum and the pressure of the compressible gas sealed in the other compartment are configured to interfere with each other, making it possible to absorb pulsations on the line side of the vacuum pressure. , the filling pressure of compressible gas can be easily set by the diameter of both bellows,
Furthermore, by adjusting the position of the regulating member, it is possible to prevent damage to the bellows due to excessive extension, and it is also possible to easily set the volume of compressible gas enclosed, which is an excellent effect.

[Brief explanation of the drawing]

FIG. 1 is a schematic cross-sectional view of the main parts of an embodiment of an accumulator according to the present invention. 1... End plate, 2, 3... Bellows, 4... Compartment (vacuum liquid introduction side), 5... Compartment (pressure sealing side for pressurized compressible gas), 6... Sealing valve , 7...deterrent mechanism,
W: Vacuum liquid, G: Pressurized compressible gas.

Claims (1)

[Scope of utility model registration request] Two large and small bellows with different diameters are provided concentrically on the end plate, a lid plate that is shared by both bellows is sealed to the free end of both bellows, and a position is freely adjustable opposite to the lid plate. A regulating member is provided, and vacuum line pressure is introduced into one of the two compartments defined between the two bellows and on the inner periphery of the small-diameter bellows, and the line pressure is introduced into the other compartment. An accumulator characterized by having compressible gas sealed in a compartment under pressure.