JPS5840078B2 - Inline type accumulator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an in-line type accumulator, and an object of the present invention is to provide an in-line type accumulator that can prevent the used elastic material tube from being damaged during operation and maintain normal function for a long period of time. The purpose is to provide an accumulator.

Conventionally, as an in-line type accumulator, as illustrated in FIG.
an inlet member 3 having an outlet port 4 and an outlet member 5 having an outlet port 4
is fixed in a sealed manner, and an inner tube 7 having a cylindrical shape and having a small hole 15 that communicates the inner circumferential side and the outer circumferential side is located between the two members 3 and 5. The longitudinal channel 6 communicates with the inlet port 2 and the outlet port 4, and a tube 8 made of a rubber-like elastic material is sandwiched at both ends between the shell 1, the inlet member 3, and the outlet member 5,
It is known that the cylindrical cavity formed by the shell 1 and the inner tube 7 is divided into an outer gas chamber 16 and an inner liquid chamber 18.

When this type of in-line accumulator is used in a liquid piping system for the purpose of preventing system pulsation, high-pressure nitrogen gas is filled into the gas chamber 16 through the valve 17 before use, and the inlet port is When the pressure of the liquid flowing in from 2 increases, the liquid flows into the inner tube 7.
The liquid enters the liquid chamber 18 from the flow path 6 through the small hole 15, expands the elastic tube 8 toward the gas chamber 16, and functions to prevent the pressure of the liquid exiting from the outlet port 4 from rising rapidly. On the other hand, when the pressure of the liquid flowing in from the inlet port 2 decreases, the elastic tube 8 contracts toward the liquid chamber 18 due to the gas pressure in the gas chamber 16, reducing the volume of the liquid chamber 18. By causing the liquid in the chamber to flow out to the outlet port 4 through the small hole 15 and the flow path 6, the pressure of the liquid at the outlet port 4 is prevented from dropping rapidly. The accumulator has the following problems.

When the elastic tube 8 contracts to reduce the volume of the liquid chamber 18, a portion of the elastic tube 8 is pressed against the inner tube 7, and this portion may be damaged.

In order to prevent damage to the elastic material tube 8, the small hole 15 bored in the inner tube 7 is set to such an extent that the elastic material tube 8 is not pushed into the small hole 15 by being pressed against the circumferential surface of the inner tube 7. As a result, the resistance of the liquid passing through the small hole 15 is so great that the liquid cannot move quickly, resulting in a slow response to pressure fluctuations in the piping system.

In view of the problems with the in-line type accumulator according to the prior art described above, the present invention provides grooves that run in the circumferential direction at appropriate intervals on the outer peripheral surface of an inner tube that is disposed inside a tube made of an elastic material. A slit that extends in the longitudinal direction and connects the inside and the outside is provided, and a supporting member made of wire to match the shape of the groove running in the circumferential direction is fitted into the groove. When the elastic tube contracts inward due to gas pressure, the inner peripheral surface of the elastic tube is supported by the support member and prevents it from digging into the slit, thereby preventing damage to the elastic tube. It protects the

Embodiments of the in-line accumulator according to the present invention will be described below based on the drawings.

As shown in FIGS. 2 to 4, the in-line accumulator according to the present invention includes a cylindrical shell 1 made of rigid metal and having a gas injection valve 17, and 01J rings 19 near both ends of the inner periphery of the shell 1 in the axial direction. an inlet member 3 and an outlet member 5, each having a longitudinal inlet port 2 and an outlet port 4, and a recessed groove 10 made of rigid metal and running circumferentially on the outer circumferential surface; , and are cut with slits 11 extending in the longitudinal direction and arranged on the circumference, and both ends of the inlet member 3 are fitted into annular grooves 12 provided in each of the inlet member 3 and the outlet member 5.
, and an inner tube 7 held between the outlet member 5,
It is made of a rubber-like elastic material, has a substantially cylindrical shape, is assembled on the outside of the inner tube 7, and is attached to both ends of the thick walled part 14.14, which is connected to both end surfaces of the inner tube, the inlet member 3, and the outlet. A tube 8 made of an elastic material and held by each of the members 5 to partition the internal cavity of the shell 1 into an outer gas chamber 16 and an inner longitudinal flow path 6, and a wire made of metal, synthetic resin, etc. The inner tube 7 has a supporting member 21 which is wound into a circular and threaded shape and fitted into a groove 10 on the circumferential surface of the inner tube 7, and the supporting member 21 is fitted into the groove 10. (Fig. 3, 4
(see figure) are fitted inside the tube 8 made of elastic material and combined with each other, and both ends of both members are inserted into the respective fitting grooves 12, 12 of the inlet member 3 and the outlet member 5. The inlet member 3 and the outlet member 5 are connected to the shell 1 in a similar manner.
It is assembled by screwing the retaining rings 23, 23 into both ends of the shell 1 and pressing the inlet member 3 and the outlet member 5 axially inward.

In the piping system using the in-line type accumulator according to the present invention configured as described above, the pressure of the gas prefilled in the gas chamber 16 through the valve 17 is used to prevent a sudden drop in the pressure on the output boat 4 side. When functioning, the elastic tube 8 whose outer circumferential surface is pressed by gas pressure is a support member whose inner circumferential surface is inserted into the groove 10 of the inner tube 7, as shown by the chain line in FIG. 2
1, and is prevented from being inserted into the slit 11 provided in the inner tube 7.

The depth of the groove 10, the height at which the support member 21 protrudes from the groove 10, the distance between adjacent support members 21, etc. are determined by the gas pressure sealed in the gas chamber, the thickness of the elastic tube 8, and characteristic values. In addition to the structure in which the concave groove 10 is formed as a single threaded groove in the longitudinal direction of the inner tube and the support member 21 wound in a screw shape is inserted, the concave grooves 10 are arranged in the axial direction. It is also possible to form annular grooves which are separated from each other and into which a circularly bent support member 21 is inserted.

Since the in-line accumulator according to the present invention has the above-described structural requirements, the following effects are brought about.

When the pressure on the longitudinal flow path 6 side decreases compared to the pressure inside the gas chamber 16, the elastic tube 8 whose outer circumferential surface is pressed by the gas pressure moves its inner circumferential surface in the circumferential direction of the inner tube 7. Supported by the running support member 21, and furthermore, the inner tube 7
Since the slit 11 provided for communicating the inside and outside of the inner tube 7 is formed so as to intersect with the direction of the support member 21 at a substantially right angle along the longitudinal direction of the inner tube 7, the tube 8 made of elastic material can be inserted into the slit 11. Penetration and damage are completely prevented.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing the structure of an in-line accumulator according to the prior art, FIG. 2 is a longitudinal sectional view showing an embodiment of the in-line accumulator according to the present invention, and FIG. 3 is an embodiment of the in-line accumulator shown in FIG. FIG. 4 is a cross-sectional view of the main part in the direction perpendicular to the axis of the embodiment of FIG. 2. FIG. 1...Shell, 2...Entrance boat, 3
...Inlet member, 4...Outlet port, 5
...Outlet member, 6...Longitudinal flow path,
7... Inner tube, 8... Elastic material tube, 10... Concave groove, 11... Slit, 12... Annular groove, 14... ...thick part,
15...Small hole, 16...Gas chamber,...Liquid chamber, 19...Original material, 23.
...Retaining ring. 17... Valve, 18 Ring, 21... Support part

Claims (1)

[Claims] 1 a cylindrical shell 1; an inlet member 3 having an inlet port 2 fixed to the longitudinal end of the shell 1; an outlet member 5 having an outlet port 4; installed between the inlet member 3 and the outlet member 5; an inner tube 7 having a longitudinal passage 6 therein; and an inner tube 7 made of a rubber-like elastic material located between the shell 1 and the inner tube 7 and having both ends fixed near both ends of the inner tube 7. The tube 8 has a groove 10 running in the circumferential direction and a slit 11 extending in the longitudinal direction on the outer periphery of the inner tube 7, and a support member 21 made of a wire is inserted into the groove 10. An inline type accumulator characterized by: