JPH071590Y2 - Pressure pulsation absorber - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a pressure pulsation absorbing device interposed in a piping system.

[Prior Art] Various devices of this type are known, for example, Japanese Patent Publication No. 55-46.
A known technique disclosed in Japanese Patent No. 486 is shown in FIG.
In FIG. 4, a spherical flexible joint 11 having a diameter larger than that of the connecting pipe is used, and an inner barrel 12 for absorbing and diffusing pulsation is provided inside the retainer, which retains the inner barrel 12.
Attach flanges 14 and 14 to 13 and 13, and attach these flanges 14 and 14
Attach the spherical flexible joint 11 to the outer body flange 15, 15
It is fastened with a plurality of bolts 16 via.

Therefore, since the flange 14 also serves as the connection between the spherical flexible joint 11 and the main pipe, the weight becomes excessive and expensive, the pipe connection is troublesome, and the connection points are on both sides of the flange 14 and at four points. There was a problem such as a lack of fluid leakage.

Further, in the pulsation damping device described in Japanese Utility Model Laid-Open No. 54-21802, the seal portions are joined in line contact as in the known example, and fluid leakage occurs.

Further, Japanese Utility Model Laid-Open No. Sho 63-75691 discloses a high frequency hydraulic pulse attenuator having a spherical attenuator. However, this known technique is for high frequencies, and therefore an orifice is provided, but it cannot be applied because the pressure pulsation in the piping system is low frequency.
When it is applied to low frequencies, it becomes large.

[Problems to be Solved by the Invention] Therefore, an object of the present invention is to provide a pressure pulsation absorbing device which is small in size and light in weight and has no fluid leakage.

[Means for Solving the Problems] According to the present invention, in the pressure pulsation absorbing device interposed between the pipe connection flanges (3, 3) provided in the pipe system, a spherical flexible joint formed of an elastic material. Flange portions (2, 2) connected to the pipe connection flanges (3, 3) are provided at both ends of (1), and the flange portions (2,
Inside of 2), cylindrical introduction diffusion pipes (5, 5) extending inward of the spherical flexible joint (1) are fitted respectively, and a spherical flexible space is provided between the introduction diffusion pipes (5, 5). Isolation part (6) at the center of the joint (1)
And the width (l) of the isolation part (6) is the diffusion tube (5).
10% or more and 30% or less of the inner diameter (d) of the diffusion tube (5), and the inner diameter (D) of the spherical flexible joint (1) at the position where the isolation portion (6) is provided is It is more than 130% and less than 200% of d).

[Preferred Embodiment] In carrying out the present invention, a plurality of elastic balls, each having a diameter larger than the width of the isolation portion and filled with air, are provided in the space between the spherical flexible joint and the isolation portion, and the space is sealed. It is desirable to prevent the outflow of gas separated from the entrained fluid and thus enhance the diffusion reduction effect of pressure pulsation energy.

[Operation] In the pressure pulsation absorbing device configured as described above, when the fluid exits from the inner end portion of the introduction diffusion pipe, it is rapidly expanded and diffused in the isolation portion, that is, the flow passage enlarged portion, and the outer periphery of the diffusion pipe. And the inner surface of the spherical flexible joint. Since the gas separated from the fluid remains sealed in this space, the pressure pulsation energy is effectively diffused and absorbed by the compressibility of the gas, and the pulsation is reduced. At this time, the width of the isolation part is 10 mm less than the diameter of the introduction diffusion tube.
% Or less and the inner diameter of the spherical flexible joint in the isolation portion is 130% or less of the diameter, the effect of reducing pulsation due to fluid expansion and diffusion is small, and if the above values are 30% or more and 20% or more, respectively It is unreasonable that the cost becomes high and the weight becomes excessive because of the large size.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

In FIGS. 1 and 2, flange portions 2 are formed at both ends of a spherical flexible joint 1 formed of an elastic material such as a rubber material of the pressure pulsation absorbing device indicated by reference numeral A. Plumbing connection flanges 3 and 3 that come into contact with the insides of the flanges 2 and 2 are provided, and a plurality of (four in the illustrated example) bolt holes 4 are formed in the flange 3.

Both flange portions 2 of the spherical flexible joint 1,
On the second side, cylindrical introductory diffusion tubes 5, 5 extending inward are fitted. In the vicinity of the diffusion pipes 5 and 5 and the flange portions 2 and 2 of the spherical flexible joint 1, as shown in the drawing, surface contact is made for a considerable length, so that leakage between them can be sufficiently prevented. An isolating portion 6 having a width 1 is formed in the central portion of the joint 1 between the diffusion tubes 5 and 5.

The width l of the isolation portion 6 is formed to be 10% or more and 30% or less of the inner diameter d of the diffusion tube 5, and the inner diameter D of the joint 1 in the isolation portion 6 is 130% or more and 200% or less of the inner diameter d. Is formed in.

Next, the operation will be described.

When the fluid exits from the inner tip portion 5a of one (for example, the right side) of the introduction diffusion pipe 5, the fluid is rapidly expanded and diffused in the isolation portion 6, that is, the flow path expansion portion, and the space portions B and B shown by diagonal lines are drawn. Since the gas separated from the fluid is contained and remains in the chamber, the pressure pulsation energy is effectively diffused and absorbed to reduce the pulsation.

FIG. 3 shows another embodiment of the present invention, which is a pressure pulsation absorbing device.
A1 spherical flexible joint 1, introduction diffusion tube 5,
In the space portion C defined by the outer periphery of 5 and the width l of the isolation portion 6.
This is an example in which a ball 7 made of an elastic material enclosing a plurality of air having a larger outer diameter is provided and the other parts are configured in the same manner as in FIG. In this embodiment, when the gas enclosed in the space portions B, B in FIG. 1 is prevented from flowing out from the isolation portion 6, the volume of the ball for enclosing the air can be easily changed, and the pressure can be changed. The diffusion reduction effect of pulsation energy can be enhanced.

[Effect of Device] As described above, the present invention has the following excellent effects.

(I) The pressure pulsation energy is effectively diffused and absorbed by the gas in the space (gas separated from the fluid and gas in the ball).

(Ii) It is only necessary to insert the cylindrical diffusion tube from both sides of the spherical flexible joint, and the manufacture and assembly are easy.

(Iii) With a specific inner diameter D, inner diameter d and width l, it is possible to obtain a compact one having a high effect of reducing pressure pulsation.

(Iv) There is no leakage except for the joint surface with the pipe flange, and the seal is reliable.

[Brief description of drawings]

1 and 2 are a side sectional view and a front view showing a first embodiment of the present invention, FIG. 3 is a side sectional view showing a second embodiment of the present invention, and FIG. 4 is a side showing a conventional device. FIG. A, A1 ... Pressure pulsation absorber, 1 ... Spherical flexible joint, 2 ... Flange part, 3 ... Flange, 5 ...
… Introduction diffusion tube, 6 …… Separator, l …… Separator width, d…
… Inner diameter of diffusion section, D …… Inner diameter of spherical flexible joint

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Creator Kazuyoshi Yamamoto 4-2-1 Motofujisawa, Fujisawa City, Kanagawa Prefecture EBARA Research Institute Co., Ltd. (56) References Kai 63-75691 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A pressure pulsation absorbing device interposed between pipe connecting flanges (3, 3) provided in a pipe system,
Spherical flexible joint made of elastic material (1)
Flange portions (2, 2) connected to the pipe connection flanges (3, 3) are provided at both ends of the flange portion (2, 2).
Inside of 2), cylindrical introduction diffusion pipes (5, 5) extending inward of the spherical flexible joint (1) are fitted respectively, and a spherical flexible space is provided between the introduction diffusion pipes (5, 5). Isolation part (6) at the center of the joint (1)
And the width (l) of the isolation part (6) is the diffusion tube (5).
10% or more and 30% or less of the inner diameter (d) of the diffusion tube (5), and the inner diameter (D) of the spherical flexible joint (1) at the position where the isolation portion (6) is provided is A pressure pulsation absorbing device characterized by being 130% or more and 200% or less of d).