JPH02217690A - Removing device for ripple in fluid - Google Patents

Abstract

PURPOSE:To prevent a pipe from breakage even in the event of abnormal rise of the intra-pipe fluid pressure by providing the pipe deformability, and fitting thereto an elliptical reinforcing member consisting of a coil spring. CONSTITUTION:On a pipe 1 made of synthetic rubber etc. an elliptical reinforcing member 3 is fitted consisting of a metal wire 2 wound tightly in correspondence to the outside dia. of the pipe 1 center when it is deformed into an ellipse, and the whole pipe 1 is wrapped with this reinforcing member 3. The ends of the pipe 1 shall be circular to form connective bases 4, 4 and for them watertightly are secured by hands 5, 5. Accordingly the elliptical reinforcing member works on the pipe even though an abnormal pressure is applied to the pipe so as to prevent trouble resulting from damage of the pipe.

Description

[Detailed description of the invention] A0 Purpose of the invention (Industrial application field) The present invention is a pulsation removal device used in a fluid pipeline.

More specifically, the present invention relates to a pulsation removing device in which an elliptical reinforcing body made of a coil spring is attached to a tube to improve pressure resistance and durability.

(Prior art) Conventionally, as a fluid pulsation removal device, Japanese Patent Application Laid-Open No. 63-231
The one described in Japanese Patent No. 089 is known, which includes a tube or a substantially spherical body having flexibility in at least one cross section, and a hole in the tube or substantially spherical body whose cross-sectional area is less than the maximum cross-sectional area. It is characterized by consisting of an elastic body that elastically regulates the cross-sectional area. Specifically, as shown in the example in the publication, a pair of elastic bodies such as a leaf spring are connected by a spacer, a bolt, or a nut. The elastic body is fixed and a flexible tube is sandwiched between these elastic bodies.

(Problems to be Solved by the Invention) In the conventional fluid pulsation removing device described above, a tube or a substantially spherical body has a portion supported by the elastic body and a portion not supported, and a portion supported by the elastic body. Because it is reinforced, it has a high pressure resistance, but the unsupported part has a poor pressure resistance because it is not reinforced, and this part has the disadvantage of breaking when the fluid pressure inside the pipe increases abnormally, causing the device to lose its function. Furthermore, since it is not possible to obtain a tube with a high pressure resistance with this device, there is a problem that a pulsation removing device for high pressure cannot be provided on the market.

The present invention was made in order to solve the above-mentioned conventional problems, and the pipe is equipped with an elliptical reinforcing body made of a coil spring. If the elasticity of the reinforcing body is selected so that the pipe will not be damaged even if the fluid pressure of The present invention aims to provide a pulsation elimination device.

1. Structure of the Invention (Means for Solving the Problems) The means of the present invention for achieving the above-mentioned object consists of a structure in which an elliptical reinforcing body made of a coil spring is attached to a deformable tube. For the pipe, select a material that is flexible and can be freely deformed, such as rubber, plastic, waterproof fabric, or other material that is resistant to the flowing fluid, and have a cross-sectional area that will carry the required flow rate. By forming and attaching an elliptical reinforcing body, which will be described later, when the pressure of the flowing liquid is below the set value, it maintains an elliptical cross section, and when the pressure increases above the set value, it deforms to a circular cross section or a shape approaching this. The pipe is designed to change its cross-sectional area without changing its circumferential length to eliminate pulsation, impact pressure, etc. This pipe usually has a single-layer structure, but if necessary, it can have a double-layer structure. It has a multilayer structure of three or more layers to provide strength and resistance to special fluids without losing flexibility.

The elliptical reinforcing body is formed by a coil spring made of an elastic wire such as metal 1 or reinforced plastics wound so as to match the outer shape of the tube when it is deformed into an ellipse, and then or coil springs made of elastic wire wrapped at appropriate intervals in the shape of an oval shape when the circle at the middle diameter between the inner and outer diameters of the tube is deformed into an oval shape. This reinforcing body exists in each part of the tube and uniformly reinforces the entire tube, so that it can flow inside the tube. Even if the fluid pressure rises abnormally, there will be no breakage in the pipe, and this elliptical reinforcing body can change the range of cross-sectional area by increasing the ratio of the major axis to the minor axis of the ellipse. It can be used to remove pulsation and shock pressure by increasing the size, and by adjusting the elasticity of the coil spring, you can freely set the pressure resistance and strength of the pipe, making it easy to use as a device to remove pulsation, etc. for high pressure. This reinforcing body is usually a single layer, and its elasticity is adjusted by the diameter of the wire, but it has a multilayer structure with two or three layers of coil springs, and the reinforcement body is made of a single layer. You can do it depending on your preference.

In addition, a pipe that has been entirely reinforced with a reinforcing body as described above,
When this is inserted into the gas chamber, when the tube deforms from an ellipse to a circle or approaches this, increasing the cross-sectional area of the tube, the gas in the gas chamber is compressed, increasing its pressure, and collaborating with the reinforcing body. This action further enhances the reinforcing effect of the pipe.

(Function) The fluid pulsation removing device configured as described above has an elliptical reinforcing body made of a coil spring attached externally or internally to the entire deformable tube through which the fluid flows or is introduced. Therefore, when the internal pressure acting on the tube is low, the tube is held in an elliptical shape by the elliptical reinforcing body, and its cross-sectional area is kept small. However, as the internal pressure acting on the tube increases, the elliptical reinforcing body made of coil springs deforms into a circular shape, deforming the tube in the same way, without changing its circumference. This increases the cross-sectional area, and the range of this cross-sectional area change increases as the ratio of the diameter of the circle where the pipe has the largest cross-sectional area to the short diameter of the ellipse where the pipe has a small cross-sectional area increases, and the durability of the pipe increases. The pressure is
The elasticity of the coil spring constituting the elliptical reinforcing body attached to this structure increases, or the elasticity increases as the number of winding layers increases.

Accordingly, this apparatus is shown in FIGS. 1 and 9 of the drawings.

When fluid is supplied to the pipeline by inserting it into the fluid pipeline as shown in Figure 11, or branching out from the pipeline as shown in Figures 8 and 10, the pump used for the supplied fluid Even if the pressure increases or decreases due to periodic changes in the discharge amount, that is, pulsation occurs, the tube deforms from an oval shape to a circular shape or a state approaching this due to the cooperation of the elliptical reinforcing body, and the circumferential length The above-mentioned pulsation is removed by changing the cross-sectional area without changing it, and when a sudden pressure increase occurs in the pipe line due to the sudden closing of a valve, etc., the range of change in the cross-sectional area of the pipe is greatly increased. If left in place, the impact pressure can be removed without changing the circumference of the tube due to the change of the tube from an oval shape to a circular shape.
In either case, since rubber, plastics, fabrics, and other materials are used, the tube, which lacks pressure resistance and strength, is replaced with an external or internal reinforcement made of an elliptical coil spring that has excellent pressure resistance and strength. Because the whole thing is reinforced with
The pipe will not be damaged even when abnormal pressure is applied.

In addition, when a tube equipped with an elliptical reinforcing body is installed in a gas chamber as shown in FIGS. 9 and 10, this device deforms from an ellipse to a circle and increases its cross-sectional area. The gas is compressed according to the pressure, and this reaction force acts on the pipe, helping the reinforcing body to control the deformation of the pipe and reinforcing it.Adjusting these actions is done by adjusting or reducing the gas pressure. This can be done arbitrarily.

(Example) Next, embodiments of the present invention will be described based on the drawings.

Figure 1 of the drawing shows a so-called in-line type embodiment in which fluid is circulated by inserting it into a pipe, and the central part of a chain pipe 1 is placed outside a synthetic rubber pipe 1 as shown in Figure 2. When the tube 1 is transformed into an elliptical shape with a proportion of the major axis and minor axis, an elliptical reinforcing body 3 made of a metal wire 2 wound in a honeycomb manner as shown in FIG. Encased by the reinforcing body 3,
Both ends of the pipe 1 are circular and fit into the connecting cap 4.4 and fastened with a band 5.5 in a watertight manner. In this embodiment, when the pressure of the fluid is low, the tube 1 is held in an elliptical shape as shown in Fig. 2 by the reinforcing body 3, and the pressure of the fluid increases. At this time, the tube 1 is deformed into a circular shape as shown in Fig. 3, or a shape similar to this, and the cross-sectional area is changed without changing the circumferential length of the tube 1, so as to absorb fluid pulsation and impact pressure. It is.

In addition, when the tube 1 shown in the above embodiment is used for feeding special fluids that attack materials such as rubber, general-purpose plastics, and fabrics, the outer layer a is coated with the above-mentioned material as shown in FIG. The inner layer is made of special plastics that are not affected by the above-mentioned special fluids, and has a multi-layer structure of two or three or more layers.The outer layer a has excellent abrasion resistance with the coil spring, and the inner layer The pipe 1 is designed to have satisfactory resistance to special fluids.

Next, when the elliptical reinforcing body 3 formed by the coil spring 2 is wound in a single layer as shown in Fig. 1, the pressure resistance and strength of the tube 1 must be imparted only by the elasticity of the constituent wire. However, as shown in Fig. 7, if the coil spring 2 has a multilayer structure of two or three or more layers, the pressure resistance and strength can be adjusted depending on the number of layers. This will immediately lead to damage to pipe 1, but if it is multi-layered, the other layers will compensate for the damaged layer.
It also helps to prevent damage to the tube 1.

In addition, the elliptical reinforcing body 3 is attached to the pipe 1 as shown in FIGS. 4 and 5.
In this case, when forming the tube 1, the reinforcing body 3 is insert-molded in the middle part of the wall thickness. At the time of this insert, if the coil spring 2 forming the reinforcing body 3 is wound tightly, the outer ia and inner layer of the tube 1 are separated, so the coil spring 2
It is preferable that the outer layer a and the inner layer of the tube 1 are wound at appropriate intervals so that the outer layer a and the inner layer of the tube 1 are reliably bonded together. As shown in the figure, the material of the outer layer a and the material of the inner layer are different, giving each layer a and b different characteristics to achieve ideal pulsation removal characteristics and safe feeding of special fluids. Sometimes I do what I can.

FIG. 8 shows a so-called outline-type embodiment in which the fluid flowing through the pipe is introduced by branching from the pipe. When the pipe is deformed into an elliptical shape with a major axis and a minor axis in proportions as shown in the figure, a metal wire 2 that matches the outer diameter of the tube 1 is rolled up in a honeycomb manner as shown in Figure 1, and an elliptical reinforcing body 3 is attached to the exterior. The entire pipe 1 is surrounded by a reinforcing body 3, and a connecting cap 4 is fitted to one end of the pipe 1, and a fitting 7 with a stopper 6 screwed to the other end is fitted to form a watertight band 5. .5 stopper, and pipe B (
(Figures omitted) so as to introduce the fluid flowing through the pipe line into the inside of the pipe 1. In this embodiment as well, when the pressure of the fluid is low, the central part of the pipe 1 is reinforced. It is held in an oval shape as shown in Figure 2 by the body 3, and when the pressure of the fluid increases, it deforms into a circle as shown in Figure 3 or a shape close to this, and the circumference of the tube 1 increases. The cross-sectional area is changed without changing the flow rate, and fluid pulsation and impact pressure are absorbed.

The embodiment shown in FIG. 9 shows an example in which the embodiment shown in FIG. 9.
In the annular groove 10.10 provided with 9 on the outside, a seal member ii,
ii, and the cylinder body 12J is fitted airtightly, and the cylinder body 12
The gas chamber 8 is formed between the pipe 1 and the gas chamber 8.
When the tube 1 is filled with pressure gas to the extent that it will not be crushed by the air supply valve 13, and the tube 1 is deformed from an elliptical shape to a circular shape or a shape approaching this due to fluid pulsation and impact pressure, and the cross-sectional area is increased, The gas in the gas chamber 8 is compressed and increases its pressure.

The reaction force of this pressure increase is applied to the pipe 1 to help the reinforcing body 3 to restrict deformation and reinforcing the pipe 1.

The embodiment shown in FIG. 10 is an example in which the embodiment shown in FIG. A sealing member 11.11 is placed in an annular groove 10.10 provided on the outside of the flange 9.9, and the sealing member 11.11 is hermetically fitted to the cylinder 12, so that the gas is kept between the cylinder 12 and the pipe 1. When a chamber 8 is formed, air at atmospheric pressure is sealed in this gas chamber 8, and the tube 1 is deformed from an elliptical shape to a circular shape or a shape approaching this due to fluid pulsation or impact pressure, thereby increasing the cross-sectional area. 9, the gas in the gas chamber 8 is compressed to increase the pressure, and the reaction force is applied to the tube 1, thereby helping the reinforcing body 3 to restrict deformation and reinforcing the tube 1. The same is true.

The embodiment shown in FIG. 11 is a modification of the embodiment shown in FIG. A trumpet-shaped expanded portion 14 is provided, and an elliptical reinforcing body 3 made of a coil spring is fitted so that it can be easily attached to the tube 1 and does not damage the tube 1.The embodiment shown in FIG. It performs the same function as .

C1 Effects of the Invention The fluid pulsation removing device according to the present invention has the advantage that even if abnormal pressure acts on the deformable tube, the entire tube is reinforced with an elliptical reinforcing body made of a coil spring. No failures due to damage.

By adjusting the elasticity of the elliptical reinforcing body made of a coil spring, the withstand pressure of the pipe can be arbitrarily set, and a pulsation removing device for high pressure can be easily provided.

The tube only deforms from an ellipse to a circle or a shape close to this within a range where the length of the circumference remains the same, and the material itself does not expand or contract, making it highly durable.

It has the following unique effects.

[Brief explanation of the drawing]

FIG. 1 is a front view, half longitudinally sectional, showing an embodiment of the pipe insertion type of the device according to the present invention. FIG. 2 is a longitudinal cross-sectional side view of the same as above when the tube is held in an elliptical shape. FIG. 3 is a longitudinal cross-sectional side view when the tube is deformed into a circular shape. FIG. 4 is a longitudinal sectional side view of a tube containing an elliptical reinforcing body that maintains an elliptical shape. Fifth
The figure is a longitudinal cross-sectional side view of a tube containing an elliptical reinforcing body that has been deformed into a circular shape. FIG. 6 is a longitudinal sectional front view of a portion of the pipe having a multilayer structure. FIG. 7 is a longitudinal sectional front view of a portion of a pipe in which multiple layers of elliptical reinforcing bodies are attached. FIG. 8 is a front view, half longitudinally sectional, showing an embodiment of a pipe branching type of the apparatus according to the present invention. FIG. 9 is a front view showing the membrane shape of the gas chamber of the embodiment shown in FIG. 1, with half longitudinally cut away. FIG. 10 is a front view taken in half lengthwise, showing the membrane shape of the gas chamber of the embodiment shown in FIG. 8. FIG. 11 is a front view, half longitudinally sectional, showing a modification of the embodiment shown in FIG. In the figure, 1 is a tube, 3 is an oval reinforcement, and 8 is a gas chamber. No. 1 Ward @9th Ward

Claims (6)

[Claims] (1) A fluid pulsation removing device characterized in that an elliptical reinforcing body made of a coil spring is attached to a freely deformable tube. (2) A fluid pulsation removing device, characterized in that the elliptical reinforcing body according to claim (1) is externally wrapped around a tube. (3) A fluid pulsation removing device characterized in that the elliptical reinforcing body according to claim (1) is built into a tube. (4) A fluid pulsation removing device characterized in that the deformable tube according to claim (1) has a multilayer structure. (5) A fluid pulsation removing device characterized in that the elliptical reinforcing body according to claim (1) has a multilayer structure. (6) A fluid pulsation removing device characterized in that a tube equipped with the elliptical reinforcing body according to claim (1) is installed inside a gas chamber.