JPS5840077B2 - Inline type accumulator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an in-line type accumulator, and an object thereof is to provide an in-line type accumulator which is small in size and has high discharge efficiency. An object of the present invention is to provide an in-line type accumulator that can effectively prevent damage during operation.

Conventionally, as an inline type accumulator, for example, the first
A structure as shown in the figure is known.

This conventional product has inlet ports 2 at both ends of a cylindrical shell 1.
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 a cylindrical inner tube γ having a large number of small holes 15 communicating between the inner and outer peripheries is located between the two members 4°5.
is located, and the longitudinal passage 6 of the inner tube communicates with the inlet and outlet ports 2.4, and the cylindrical space formed by the inner tube 7 and the shell 1 has a gas chamber 16 and a liquid chamber on the inner and outer peripheries. A rubber-like elastic tube 8 is clamped and fixed at both ends between the shell 1 and the inlet and outlet members 3.5 so as to be divided into two parts.

When this 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 via the valve 1T before use. When the pressure of the inflowing liquid increases, the liquid flows into the flow path 6 through the small hole 15 of the inner tube 7.
enters the liquid chamber 18 and inserts the elastic tube 8 into the gas chamber 1.
6 side to prevent the liquid pressure flowing out from the outlet port 4 from rapidly increasing. On the other hand, when the liquid pressure flowing in from the inlet port 2 decreases, the gas pressure in the gas chamber 16 causes the elastic material to expand. The tube 8 contracts toward the liquid chamber 1B, reducing the volume of the liquid chamber 18 and causing the liquid in the same chamber to flow out to the outlet port 4 through the small hole 15 and the flow path 6, causing the liquid pressure at the outlet port 4 to suddenly increase. It functions so that it does not decrease.

However, this type of conventional product has the following problems.

That is, (1) When the elastic tube 8 contracts so as to reduce the volume of the liquid chamber 18 toward the inner tube 7 side, wrinkles occur in the elastic tube 8, and the wrinkled portion is forced onto the inner tube 1 by high pressure gas. As a result, this part may be damaged.

■ Therefore, in order to prevent the damage described in (■) above, it is difficult to provide a large difference between the diameter of the elastic tube 8 and the outer diameter of the inner tube 1, that is, to increase the volume of the liquid chamber 1B. , elastic material tube 8 (7Ji tension,
Due to the contraction, the amount of fluid flowing in and out of the liquid chamber 1B is also small, resulting in poor discharge efficiency.

Furthermore, the small hole 15 provided in the inner tube T is required to be sufficiently small to prevent the elastic tube 8 from being pushed against the outer periphery of the inner tube 7 by gas pressure and being damaged by protruding from the small hole 15. This small hole 15
The resistance of liquid flowing in and out of the piping system is large, and the liquid cannot move in and out quickly, resulting in a slow response to pressure fluctuations in the piping system.

The present invention aims to eliminate the problems seen in the above-mentioned conventional products, and the present invention will be explained below based on FIGS. 2 to 4.

The in-line type accumulator according to the present invention includes a cylindrical shell 1 made of a rigid metal material and having a gas injection valve 17, and a screw threadedly connected to the shell 1 through O-IJ songs 9 near both ends of the inner circumferential axis of the shell 1. An inlet member 3 and an outlet member 5 are fixedly connected to each other and each has an inlet port 2 and an outlet port 4 in the longitudinal direction. port 4
An inner tube 1 made of a rigid material such as metal or plastic having a longitudinal passage 6 communicating with the inner tube 7, and annular grooves 20 and 21 provided near the outer periphery of both ends of the inner tube 7.
and the longitudinal extension 33.55 of the inlet member 3 and the outlet member 5 located on the outer periphery thereof.
has a tube 8 made of a rubber-like elastic material such as nitrile rubber, which is clamped and fixed and forms a space between the inner periphery of the shell 1 and the inner tube 17 and separates the gas chamber 16 and the liquid chamber 18. Although it has a cylindrical shape near both ends, a plurality of longitudinal grooves 10 are provided on its outer periphery, which gradually become deeper from both ends toward the longitudinal center.
These grooves 10 are divided in the circumferential direction by a plurality of, preferably four, fins 9t having a height similar to the outer diameter near both ends of the inner tube I.

Further, the bottom portion 11 of this groove portion 10 is communicated with a longitudinal flow path.

A through opening 12 is provided, preferably consisting of a longitudinal slit.

Furthermore, this inner tube T has a groove 1 at the same position as the through hole 12 in the circumferential direction and on the outer periphery of the through hole 12.
A hole 24 is provided from the center of the hole 24 toward both ends in the longitudinal direction, and a spring 13 such as a leaf spring is inserted into the hole 24 on the inner circumferential side of the hole 24, and a rod member 14 made of a rigid material such as metal is inserted into the hole 24. Both ends of the rod member 14 are inserted, and the center portion of the rod member 14 is positioned at the outer periphery of the through hole 12 with a gap therebetween due to the elasticity of the spring 13.

This inner tube T may be made of plastic such as polyacetal resin if required from the viewpoint of shape and cost. In that case, the inner circumference may be reinforced with a metal core material 25 from the viewpoint of strength. Preferably, by doing this, the outer tube 26 made of plastic is molded in two parts in the longitudinal direction, and when assembled, the two divided outer cylinders 26 can be glued at the center on the core material 25, so that the inner tube 1
It is advantageous for molding.

Since the present invention has the above-described configuration, it has the following advantages.

That is, when the in-line type accumulator of the present invention is used in a liquid piping system, it is sealed into the high-pressure nitrogen gas chamber 16 through the valve 17. At this time, when the pressure of the liquid flowing in from the inlet port 2 increases, the liquid flows into the inner tube. Penetration 1
2 into the liquid chamber 18, the elastic tube 8 is expanded toward the gas chamber 16 against the gas pressure, and functions to prevent the discharge pressure on the outlet port 4 side from increasing rapidly.

Then, when the inflow pressure on the inlet port 3 side decreases,
The liquid held in the liquid chamber 18 flows out into the flow path 6 through the through hole 12 due to the action of the elastic tube 8 which attempts to reduce the volume of the liquid chamber 18 due to gas pressure, so that the liquid held in the liquid chamber 18 flows out into the flow path 6 through the through hole 12. Avoid sudden decrease in discharge pressure.

In this case, since the inner tube T is provided with a plurality of fins 9, even if the tube 8 made of elastic material is in complete contact with the inner tube 7 and the volume of the liquid chamber 18 becomes zero, the elastic material Since the manufactured tube 8 does not deform and bend along the fins 9 and grooves 10 of the inner tube 7, there is no problem of wrinkles in the axial direction due to failure to fully contract as in the prior art.

Therefore, in the present invention, it is possible to design the volume of the liquid chamber 18 to be sufficiently large, and it is possible to obtain an accumulator with excellent discharge efficiency.

Furthermore, in the case where the rod member 14 whose both ends are inserted near both ends of the inner tube 1 via the spring 13 is positioned on the outer periphery of the through-hole 12 with a gap, the through-hole 12 is connected to the flow path. 6 and the liquid chamber 18 (
Even if the size is large enough to cause no problem, the elastic tube 8
When the rod member 14 is deformed toward the liquid chamber 18 side due to gas pressure, the rod member 14 moves in the direction (inner circumferential side) to close the through hole 12 against the spring 13 by the elastic tube 8 itself, and covers the through hole 12. Therefore, it is possible to prevent the elastic tube 8 from protruding from the through hole 12 to the inner peripheral side and being damaged.

Therefore, the resistance of the liquid flowing in and out of the through hole 12 can be reduced, and the presence of the spring 13 also eliminates the risk of blocking the through hole 12 due to the liquid flow 1 passing through the optical path 6. are doing.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view showing a conventional product, Fig. 2 is a partial longitudinal sectional view showing an embodiment of the present invention, and Fig. 3 is a perspective view of the inner tube taken from the A-A cross section in Fig. 2. The figure and FIG. 4 are cross sections taken along the line BB in FIG. 3. 1...Shell, 2...Inlet port, 3
...Inlet member, 4...Outlet port, 5
...Exit member, 6...Axial straight path, 7
...Inner tube, 8...Elastic material tube, 9...Fin, 10...
Groove portion, 11... bottom, 12... through hole, 13... spring, 14... bar member, 15... small hole, 16...gas chamber,
17...Valve, 18...Liquid chamber, 1
9...O-IJ song 20.21...
Annular groove, 22゜23...Thick wall part, 24...
... Hole, 25 ... Core material, 26 ... Outer cylinder, 33.55 ... Longitudinal extension.

Claims (1)

[Scope of Claims] 1. A cylindrical shell 1, an inlet member 3 having an inlet port 2 sealed near both ends of the inner circumferential longitudinal direction of the shell 1, an outlet member 5 having an outlet port 4, the inlet and an inner tube 1 mounted between the outlet members 3.5 and having a longitudinal passage 6 on its inner periphery, and an inner tube 7 located between the shell 1 and the inner tube 1;
The inner tube I has a tube 8 made of a rubber-like elastic material with both ends fixed near both ends, and a plurality of tubes on the outer periphery of the inner tube I that become deeper toward the center in the longitudinal direction and extend radially in the circumferential direction. An in-line type accumulator characterized in that a plurality of grooves 10 are provided separated by fins 9, and a bottom 11 of the grooves 10 communicates with the longitudinal flow path 6 through a through hole 12. 2. The in-line type AccuL notor according to claim 1, wherein the through hole 12 is a slit extending in the longitudinal direction. 3. A cylindrical shell 1, an inlet member 3 having an inlet port 2 and an outlet member 5 having an outlet port 4 sealed in the vicinity of both longitudinal ends of the inner circumference of the shell 1, and a space between the inlet and outlet members 3.5. an inner tube 7 which is attached to the shell 1 and has a longitudinal passage 6 on its inner periphery; and an inner tube T located between the shell 1 and the inner tube 17;
The inner tube 1 has a tube 8 made of a rubber-like elastic material whose both ends are fixed near both ends, and a plurality of tubes on the outer periphery of the inner tube 1 that become deeper toward the center in the longitudinal direction and extend radially in the circumferential direction. A plurality of grooves 10 are provided which are separated by fins 9, and the bottom 11 of the grooves 10 communicates with the longitudinal flow path 6 through a through hole 12, and the outer periphery of the through hole 12 has springs 13 at both ends. An in-line type accumulator characterized in that rod members 14 inserted near both ends of the inner tube T are positioned.