JPH0521620B2 - - Google Patents

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to a jet mixer that is disposed in a fluid delivery system and mixes a desired gas or liquid into the fluid and delivers the mixture to a predetermined location. Regarding.

[Conventional technology]

In general, a jet mixer is used to blow or suck a desired gas or liquid into a fluid delivery system that delivers fluid at a predetermined flow rate, and then deliver the fluid in a desired state to a predetermined location. has been done. As shown in FIG. 2, which is a longitudinal cross-sectional view of an example, this jet mixer has a main body 1, a fluid inlet port 2 from the direction A on the upstream side of the fluid supply system, and a fluid inlet port B
The inlet 2 has a fluid outlet 3 in the C direction, and a inlet 4 for supplying a desired mixed gas or liquid in the C direction.
An injection pipe 5 is inserted between the outlet port 3 and the outlet port 3 .

Along the center line of the injection pipe 5, a flow path 6 is formed whose cross-sectional area gradually decreases in the fluid feeding direction and then gradually increases in the fluid feeding direction to impart a throttle effect to the fluid. This throttle effect is caused by the so-called convergent passage mentioned above, where the velocity of the fluid increases at the throat, gradually decreases at the taper, and recovers at the exit, while the pressure of the fluid decreases at the throat and at the taper. Occurs by gradually increasing and recovering at the exit. Such a constricted shape can increase the flow rate of the fluid, and can more effectively promote mixing with the gas or liquid blown through the small holes of the injection pipe. A large number of small holes 7 are bored in the outer circumferential wall of the flow path 6 to communicate the flow path with the inside of the main body 1 and to be inclined at a predetermined acute angle with respect to the fluid feeding direction.

The connection between the body 1 and the injection tube 5 is carried out, for example, by a threaded connection 8 at one end. 11 is a drain plug.

In this jet mixer, a desired gas or liquid is supplied (or suctioned) into the main body 1 from the feed port 4, and is introduced into the feed fluid from the small hole 7 by the suction effect of the injection pipe channel 6. Functions to mix mixed fluids.

In this case, the mixed fluid flowing into the mixed fluid chamber formed by the outer circumferential surface of the injection pipe 5 and the inner circumferential surface of the main body 1 receives the feeding fluid from the small hole 7 due to the rapid flow rate. Fluctuations and density changes occur.
This caused a water hammer effect in the fluid delivery system, causing problems such as noise and vibration.

As a means to avoid this phenomenon, an insert, for example, a thin fibrous metal wire such as stainless steel, can be placed in the mixed fluid chamber between the inner circumferential surface of the main body 1 and the outer circumferential surface of the injection tube 5, as shown in FIG. A structure in which an insert 10 made of woven or knitted fabric is inserted has been proposed.

As a result of the above-mentioned measures, the problems such as noise and vibration caused by the water hammer effect described above can be temporarily resolved, as the flow velocity of the mixed fluid introduced is reduced by the insert inside the mixed fluid chamber. We were able to.

However, in the conventional example, (1) rust, dirt, etc. in the pipe accumulate inside the insert of the thin metal wire, reducing the performance of the insert during use, and (2) some of the thin wire The problem is that the liquid breaks inside the main body and flows into the piping, causing problems such as damage to component equipment and clogging, which can be fatal, especially in the case of edible fluids.

As a means to solve these problems, the present inventor has proposed a jet mixer in which a large number of individual springs of a predetermined size are inserted into a fluid chamber to form a group of individual springs. (Japanese Patent Publication No. 1-12532) [Problems to be Solved by the Invention] In this jet mixer, a single spring is inserted into the fluid chamber through the supply port 4 in Fig. 2, and then manually inserted into the fluid chamber. There is. However, it requires skill to arrange the springs so that they are evenly distributed within the fluid chamber, and unless the springs are evenly distributed, it is difficult to achieve a perfect hammering prevention effect.

Additionally, when the jet mixer is installed in a piping line, the spring itself will be biased toward the outlet port 3 side in Fig. 2 in the fluid chamber during use, and the
On the side, a region where no single spring exists or a region where the distribution of single springs is small occurs.

In particular, it has been found that the greater the difference between the pressure on the supply port 4 side and the pressure on the supply port 2 side, the more likely the spring is to be biased, resulting in hammering at that portion.

[Means to solve the problem]

In order to solve the above-mentioned problems, the present invention is arranged in a fluid supply system, and includes an upstream fluid insertion port, a downstream fluid delivery port, and a gas or liquid delivery port to be mixed. A main body provided on an outer peripheral wall, a through passage inserted and fixed between the fluid inlet and the fluid outlet and giving a throttle effect to the fluid, and a plurality of small holes already provided in the outer peripheral wall of the flow passage. In the jet mixer including an injection pipe, a plurality of block-shaped springs made of blocks of spring wire bodies are each loaded in a fluid chamber formed between the inner circumferential surface of the main body and the injection pipe. A water hammer prevention device for a jet mixer is provided.

[Effect]

The gas or liquid for mixing of the jet mixer, into which a plurality of block-shaped springs according to the present invention are inserted, is supplied to the supply port 4.
When the mixed fluid is fed (or sucked) into the mixed fluid chamber,
The fluid collides with, deflects, and bends a group of spring wire bodies in a block-shaped spring evenly inserted into the fluid chamber, and is gradually decelerated while flowing between a large number of spring wire bodies and flows into the injection pipe. 5 reaches the opening of the small hole 7.

In this case, the mixed fluid chamber is loaded with a block-shaped spring divided into a plurality of pieces, and this block-shaped spring can be easily and evenly distributed in the fluid chamber, and there is no bias in the fluid chamber. No ring is formed.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

FIG. 1A is a partially cut away perspective view of an embodiment of a jet mixer having a water hammer prevention device according to the present invention, and FIG. 1B is a perspective view showing an example of the block-shaped spring in FIG. 1A.

As shown in FIG. 1A, this jet mixer has a main body 1, a fluid inlet 2 from the A direction on the upstream side of the fluid delivery system, a fluid outlet 3 in the B direction, and a fluid inlet 3 for desired mixing. It has a supply port 4 for supplying gas or liquid from the C direction, and an injection pipe 5 is inserted between the supply port 2 and the discharge port 3.

Along the center line of the injection pipe 5, a flow path 6 is formed whose cross-sectional area gradually decreases in the fluid feeding direction and then gradually increases in the fluid feeding direction to impart a throttle effect to the fluid.

On the outer circumferential surface of the injection tube 5, protrusions are formed in an annular shape in the tube circumferential direction at predetermined intervals in the tube axis direction, and a plurality of small holes 7 formed in the protrusions are connected to the flow paths 6, respectively. is connected to. The protruding portion has a shape whose diameter increases toward the fluid feeding direction side. Projections having such small holes 7 formed therein are sequentially formed in the tube axis direction.

A small hole 7 that communicates this flow path 6 with the inside of the main body 1
is inclined at a predetermined acute angle toward the tube axis with respect to the fluid feeding direction.

The connection between the body 1 and the injection tube 5 is carried out, for example, by a threaded connection 8 at one end. 11 is a drain plug.

The mixed fluid chamber formed by the inner circumferential surface of the main body 1 and the outer circumferential surface of the injection pipe 6 includes a spring wire body 1.
A plurality of block-shaped springs 13 are each loaded with a plurality of block-shaped springs 13, each of which is formed by winding a spring 4 into a block.

In this jet mixer, a desired gas or liquid is supplied (or suctioned) into the main body 1 from the feed port 4, and is introduced into the feed fluid from the small hole 7 by the suction effect of the injection pipe channel 6. Functions to mix mixed fluids.

As shown in FIG. 1B, this block-shaped spring 13 is made from a long spring wire
4 is wound (rolled) into a block shape.
Therefore, the cut point of the spring wire body 14 (that is, the longitudinal end of the spring wire body) is almost never located on the outer peripheral surface of the block-shaped spring 13, and the block-shaped spring 13 is not inserted into the mixed fluid chamber. When doing,
There is no possibility that the block spring 13 will become stuck to the wall of the mixed fluid chamber and impair the smooth insertion operation.

Note that the cut portion of the spring wire body 14 from the block-shaped spring 13 may be exposed in one direction. In this case, if the block-shaped spring 13 is inserted into the mixed fluid chamber from the direction opposite to the exposed direction of the cut portion of the spring wire body 14, the insertion work is easy.
Further, during use, the cut portion of the spring wire body 14 is locked to the wall surface of the mixed fluid chamber, so that the block-shaped spring 13 can be prevented from being biased.

The spring wire body 14 has a wire diameter larger than the thin metal wire used in the conventional example, and is, for example, a long spring wire body 1.
4 rolled into a block shape is obtained. These block-shaped springs 13 are divided into a plurality of pieces and evenly filled in the mixed fluid chamber. The block-shaped spring 13 may be formed by rolling one spring wire body into one block shape or by rolling two or more spring wire bodies into one block shape. In this case, it is desirable that the cut portions of each spring wire body (lengthwise ends of the single spring body) be buried within the block so that they are not exposed to the outer peripheral surface of the block.

Further, the block springs 13 do not need to be completely rounded into a spherical shape, and have a shape that allows easy insertion into the mixed fluid chamber, and when a plurality of block springs 13 are loaded into the mixed fluid chamber, there is a gap between each block spring 13. There are no particular restrictions on the shape of the block as long as it does not create an unnecessarily large gap. However, in order to increase the porosity between the block springs 13 in the mixed fluid chamber, it is desirable to combine a block spring with a large outer diameter and a block spring with a small outer diameter.

When such block-shaped springs are combined, it is sufficient to manufacture only two types of block-shaped springs, one with a large outer diameter and one with a small outer diameter, which simplifies the manufacturing process of the block-shaped springs.

Moreover, the block-shaped springs 13 do not all have the same shape, and when the mixed fluid chamber is divided into a plurality of sections in the fluid feeding direction, they can have a shape that approximates the shape of each section.

The material of the spring wire body 14 is selected as appropriate depending on the properties of the passing fluid. For example, the material is acid-resistant and wear-resistant for acidic fluids, and especially for high-temperature steam for heat exchange. It can be replaced with a heat resistant one. It goes without saying that the number of filling block springs 13, the winding density of the spring wire in each block spring, etc. can be changed as appropriate depending on the contents passed through.

〔Effect of the invention〕

As described above, according to the present invention, since a plurality of block springs are inserted into the fluid chamber, the work of inserting the springs into the fluid chamber is simple, and the arrangement state of the spring wire bodies in the fluid chamber can be easily adjusted. Since it can be made uniform and the spring wire body does not become biased even during use, it is possible to obtain an extremely quiet mixing operation without producing the noise or vibration that accompanies water hammer operation.

[Brief explanation of the drawing]

FIG. 1A is a partially cutaway perspective view of a jet mixer having a water hammer generation prevention device according to the present invention, FIG. 1B is a perspective view showing an example of the block-shaped spring in FIG. 1A, and FIG. FIG. 2 is a longitudinal sectional front view of a conventional jet mixer equipped with a water hammer prevention device. 1...Body, 2...Inlet, 3...Outlet, 4
... Supply port, 5 ... Injection pipe, 6 ... Channel, 7 ...
Small hole, 8...Screw engagement part, 10...Insert, 11
... Drain plug, 12 ... Single spring, 13 ... Block spring, 14 ... Spring wire body.

Claims (1)

[Scope of Claims] 1. A main body disposed in a fluid supply system and having an upstream fluid insertion port, a downstream fluid delivery port, and a gas or liquid delivery port to be mixed on the outer peripheral wall; A convergence through passage that is inserted and fixed between the fluid inlet and the fluid outlet and that gives a throttle effect to the fluid, and an injection pipe that has a plurality of small holes bored in the outer peripheral wall of the flow passage. In a jet mixer including,
A jet characterized in that a plurality of block-shaped springs made of blocks of spring wire bodies are each loaded in a mixed fluid chamber formed between an inner circumferential surface of the main body and an outer circumferential surface of the injection pipe. Water hammer prevention device in mixers. 2. The water hammer prevention device for a jet mixer according to claim 1, wherein said block-shaped spring is formed by winding one long spring wire body in a block shape. 3. The water hammer prevention device for a jet mixer according to claim 1, wherein said block-shaped spring is formed by winding two to several spring wire bodies in a block shape. 4. The block spring according to claim 1, wherein the block-shaped spring is made up of a block with a large outer diameter and a block with a small outer diameter, and a gap between the blocks with a large outer diameter is filled with a block with a small outer diameter. Water hammer prevention device in jet mixer.