JPH0221933A - Method and device for static foaming - Google Patents

Abstract

PURPOSE:To increase the service life of the title foaming device by providing plural inlets on the end face on the inflow end side of a housing or on the side wall, and furnishing an outlet on the outflow end side. CONSTITUTION:An air supply pump 11 and a material supply pump 12 are operated to introduce the air A and the material B respectively into the housing 1 from an air inlet 5 and a material inlet 6 through an air inlet pipe 8 and a material inlet pipe 9. The air and material pass through open cells 2a of many foaming elements 2 and the gaps between the elements 2, 2,... to form a uniformly foamed fluid C which is introduced into a foam outlet pipe 10 from a foam outlet 7. Accordingly, since the elements 2 are randomly distributed, the fluids collide with the elements 2 and are dispersed, the course is changed in various directions, and both fluids are uniformly foamed. As a result, the cost is drastically reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a static foam generating device, which generates substantially uniform foam without particularly providing dynamic components, and which is capable of filling voids and The present invention relates to a static foam generating device that enables the formation of a foam sprayed layer with a substantially uniform thickness.

[Prior Art] Conventionally, static foam generators generate foam by rotating a screw shaft, which is a foaming element fitted in a housing.
There is a method of foaming by mixing the foaming agent introduced between the housing and the screw shaft with air.

However, since such a method is dynamic and requires a rotating mechanism, the structure is complicated and large, the range of use is limited, and there are consumable parts, so the service life is short. Not only are they prone to breakdowns, but they also require a separate power source.

Therefore, in recent years, a static foam generating device having no dynamic elements such as a rotating shaft has been proposed, and an attempt is made to eliminate the above-mentioned drawbacks.

As the above-mentioned static mixing device that is already known, there is one that mixes two liquids at the tip of a foam generator and ejects foam by a reaction between the two liquids.

However, in the conventional method, when the foam is sprayed onto the foam spraying body, foaming occurs later, and due to the volume change due to foaming and the flow of unreacted liquid, the foam spraying body There was a problem in that the foam-sprayed layer on the surface of the foam-sprayed layer was likely to have irregularities, and that it was difficult to maintain the thickness of the foam-sprayed layer substantially constant.

In addition, in this case, there is a problem in that during spraying, the foam sprayed layer sometimes sag, making it difficult to perform the spraying smoothly.

Furthermore, in the conventional method described above, when filling the through holes etc. with a filler made of foam to block the through holes etc., not only does the unreacted liquid flow out, causing stains, but also foaming occurs. There was a problem in that the formwork was destroyed due to the expansion of the body.

Therefore, a method of accelerating the reaction rate was proposed as a method to solve the above problems, but when using this method, 2
There was a problem in that a clogging phenomenon occurred due to variations in reaction in the liquid mixing section.

Therefore, as a solution to such conventional problems,
Some devices allow the foam to flow into the sprayer without completing foaming before it flows into the sprayer, but this not only causes the foam to shrink due to the pressure during pressure feeding, but also causes a drop in pumping performance. The diameter of the hose also needs to be increased to account for the expansion caused by the bubbles, resulting in high cost and inefficiency.

[Problems to be Solved by the Invention] In view of these problems in the prior art, the main purpose of the present invention is to abandon the idea of using dynamic elements and foam elements with complicated shapes as described above. Moreover, by using a simple and suitable foam generating element that can increase foaming efficiency and arranging a large number of these in the housing, two or more types of fluids can pass through the housing and still An object of the present invention is to provide a static foam generating device capable of substantially uniformly mixing and foaming.

[Means for Solving the Problems] According to the present invention, a plurality of bubble generating elements are mounted inside a hollow housing having an inlet and an outlet. A static foam generating device is provided in which bubbles are generated when fluid passes through the housing, and a plurality of the inflow ports are individually provided on the end face or side wall of the inflow end of the housing, and To provide a static foam generating device, wherein the outflow port is provided on the end face or side wall on the outflow end side of the housing, and a large number of foam generating elements are arranged inside the housing. This is achieved by

1 Effect] By configuring as described above, the present invention utilizes the energy of the two or more types of fluids flowing inside the housing to reduce the gap between a large number of bubble generating elements arranged inside the housing. By connecting the through holes of the element in a bent state, the fluid not only collides and disperses, but also causes various flow direction changes such as flux branching, merging, swirling, spiral flow, and reversal. This can promote uniform mixing and foaming, thus increasing foaming efficiency.

In addition, foaming can be performed without a power source or transmission mechanism, and the foam generating element can be subdivided and the shape can be simplified.
Loading the device is a simple task of just putting it in, and there is no risk of failure, the service life is long, and there is almost no need for maintenance.

Furthermore, when spraying the foam onto the foam spraying body or filling a void, the foam is sprayed or filled after foaming, so that the foam layer on the surface of the foam spraying body has a uniform surface. Not only does this make it difficult to form unevenness and it is easy to maintain the thickness of the foam sprayed layer at a constant level, but spraying also sometimes causes stains due to the outflow of unreacted liquid and destruction of the formwork due to expansion of the foam. Also, problems such as dripping phenomenon are prevented from occurring, and spraying or filling becomes easier to perform smoothly.

Embodiment 1 The present invention will now be described in detail with reference to specific embodiments with reference to the accompanying drawings.

1 and 2 show a first embodiment of the device according to the invention, in which a hollow housing 1 has a number of bubble generating elements 2 housed therein.

The illustrated housing 1 is formed into a hollow cylindrical shape, and an intermediate space 4 is defined by a flow control 3.3 made of a mesh or the like arranged at both ends of the housing 1, and a large number of the bubble generating elements 2 are loaded in the same space 4. has been done.

The passage hole 3a formed by the mesh of the passage presser 3 is formed to have a smaller diameter than the bubble generating element 2, and prevents the bubble generating element 2 from flowing out and impurities such as dust from flowing in. .

Further, as clearly shown in FIGS. 1 and 2, the bubble generating element 2 has a diameter and length significantly smaller than that of the housing, and has a through hole 2a through which fluid can flow. It is formed in a cylindrical shape with a hole formed through it, and is made of a material such as ceramic or plastic that will not be eroded by the flowing fluid.

The bubble generating elements 2 are randomly arranged in the intermediate space 4 of the housing 1 so that the respective through holes 2a do not face in the same direction but in different directions.
At this time, the gaps between the bubble generating elements 2 in the housing 1 also become irregular in direction and shape, and as a result, the flowing fluid not only collides and disperses, but also causes flux branching, merging, swirling, spiral flow, and reversal. The fluid is given various changes in the direction of flow, and as the fluid passes through it, it is foamed substantially uniformly, and the fluid is foamed sufficiently.

The size and loading density of the foam generating element 2 are selected to be most suitable depending on the viscosity and flow rate of the flowing fluid, the degree of foaming, etc.

Further, the housing 1 has two parts on the end face 1a on the inflow end side.
Two inlets, namely an air inlet 5 and a material inlet 6, are provided separately so that different types of fluids can flow in, and
A single outflow lower is provided on the end surface 1b on the outflow end side.

Furthermore, an air inflow pipe 8 and a material inflow pipe 9 are connected to the air inflow port 5 and the material inflow port 6, respectively, and a foam outflow pipe 10 is connected to the outflow lower.

Further, an air supply pump 11 and a material supply pump 12 are connected to the air inflow pipe 8 and material inflow pipe 9, respectively.

The materials supplied to the material inflow pipe 9 include, for example, a mixture of a hydraulic substance or an air-hard substance such as cement or lucium hydroxide, a mixture such as fly ash or aluminum hydroxide, methylcellulose, acrylic emulsion, etc. Examples include a mixture of a thickener such as a vinyl acetate emulsion, a surfactant, and water.

Next, a first embodiment of the static foam generation method according to the present invention will be described.

First, as shown in FIG. 1, two types of fluids, for example, air A and material
2, through the air inflow pipe 8 and material inflow pipe 9,
The air flows into the housing 1 separately from the air inlet 5 and the material inlet 6, and passes through the through holes 2a of a large number of bubble generating elements 2 and the gaps between the bubble generating elements 2.2. Then, the foamed fluid C, which is foamed almost uniformly, is allowed to flow down from a single foam outflow lower to the foam outflow pipe 10.

In this case, since the bubble generating elements 2 are randomly arranged, when the fluid passes through the bubble generating elements 2, it not only collides and is dispersed, but also causes flux branching and merging. , it becomes a spiral state, and it also becomes a spiral flow or an inverted state, so the flow direction changes in various places.
Due to this flow change, both fluids are foamed sufficiently uniformly.

FIG. 3 shows a second embodiment of the static foam generating device and static foam generating method according to the present invention.

That is, unlike the above-mentioned embodiment, the inflow pipe consists of a first material inflow pipe 13 and a second material inflow pipe 14, as clearly shown in FIG. It is connected to a first material inlet 15 and a second material inlet 16, respectively, which are provided on the end surface 1a.

The first material inflow pipe 13 is provided with an injector 17 at its rear end, and the injector 17 is equipped with an air pipe 18 having an air supply pump 11 at its end and a material hopper 19 at its end. The first material pipes 20 are connected to each other separately.

Furthermore, the second material inflow pipe 14 is equipped with a material supply pump 12 at its rear end.

The first material supplied to the first material inflow pipe 13 includes, for example, a mixture of a hydraulic substance or an air-hard substance such as cement or lucium hydroxide, a mixed material such as fly ash or aluminum hydroxide, and methyl cellulose. , a mixture of a thickener such as acrylic emulsion or vinyl acetate emulsion, a surfactant, and water.

Further, examples of the second material supplied to the second material inflow pipe 14 include quick-setting materials such as a diluted water glass solution and a diluted lucium chloride solution.

Next, a second embodiment of the static foam generation method according to the present invention will be described.

First, as shown in FIG.
, the material flows into the housing 1 from the first material inlet 15 via the air pipe 18, the first material pipe 20, the injector 17, and the first material inlet pipe 13. On the other hand, the second material F is caused to flow into the housing 1 from the second material inlet 16 via the second material inflow pipe 14 by the operation of the material supply pump 12 .

Next, the air A, the first material C, and the second material F, which have been separately introduced into the housing 1, are transferred to the through holes 2a of a large number of bubble generating elements 2, the bubble generating elements 2, 2, . ...Through the gaps between them, the flow changes in the same way as in the first embodiment, and flows down from the single foam outflow lower to the foam outflow pipe 10 as foamed fluid C, which is foamed almost uniformly. let

Although the housing 1 has a straight tube shape with a hollow circular cross section in the above embodiment, the housing 1 is not limited to this as long as it can accommodate a large number of bubble generating elements 2 therein. Hollow elliptical shapes are also acceptable, as well as curved pipes, twisted pipes,
It may be in the form of a coiled pipe or the like, and the lower foam outflow side may have a foam outflow nozzle or a foam outflow cap instead of the foam outflow tube 10.

Further, the number of inflow pipes for materials, etc. is not limited to those in the above embodiments, and the number of inflow pipes corresponding to the number of types of materials to be inflowed may be provided.

Furthermore, the bubble generating element 2 is not limited to the cylindrical shape in the above embodiments, but may also be formed into a rectangular cylinder, an elliptical cylinder, a bent cylinder, a coil, or a block such as a sphere or a polyhedron. One or more through holes may be formed in parallel or intersecting shapes, and the fluid flowing through the gaps between the bubble generating elements 2 in the housing 1 and the through holes 2a is prevented from flowing. The shape and number of through holes 2a can be arbitrarily selected as long as the flow direction can be changed and the flow can be made to flow without any problems.

Further, as the bubble generating elements 2, a large number of bubble generating elements 2 having the same shape as described above may be housed in the housing 1, or a large number of bubble generating elements 2 of different types may be housed in the housing 1.

Furthermore, since the static foaming device according to the present invention is static and does not require a rotating mechanism, the structure is simple and compact, the range of use is expanded, and there are no consumable parts, so the usable life is long. In addition, it is not only difficult to cause failures, but also does not require a separate power source, so it can be widely used for filling voids, forming a foam sprayed layer with a substantially uniform thickness, and other uses.

In this way, the static foaming device according to the present invention utilizes the energy of two or more types of fluids to increase the gap between a large number of foam generating elements 2 arranged in the housing 1 and the through holes of the same elements. By connecting 2a in a bent state, the fluid not only collides and disperses, but also causes flux branching, merging, swirling,
Uniform foaming can be promoted by applying various flow direction changes such as spiral flow and reversal. Therefore, the foaming efficiency is significantly increased, so it can be widely used as an in-line device or a stand-alone device.

[Effects of the Invention] Since the present invention is configured as described above and can be realized as described above, it is static and does not require a rotation mechanism, so the structure is simple and compact, and the range of use is wide. In addition to being expanded, there are no consumable parts, so it not only has a long service life and is less likely to break down, but also does not require a separate power source, so it can fill voids and form a foam sprayed layer with a substantially uniform thickness. , and can be used for a wide range of other purposes.

Further, the present invention utilizes energy possessed by two or more types of fluids to connect the gaps between a large number of randomly arranged bubble generating elements 2 with the through holes 2a of the elements in a bent state. , it is possible to promote uniform foaming by not only colliding and dispersing the fluid, but also applying various flow direction changes such as flux branching, merging, swirling, spiral flow, and reversal, thereby increasing foaming efficiency. It can be widely used as an in-line device or a stand-alone device.

Furthermore, when spraying the foam onto the spraying body or filling a void, the foam is sprayed or filled after foaming, so that the foam layer on the surface of the foam spraying body becomes uniform. Therefore, it is difficult to form unevenness, and it is easy to maintain the thickness of the foam sprayed layer at a substantially constant level.

In addition, in this case, problems such as staining caused by the outflow of unreacted liquid, destruction of the formwork due to expansion of the foam, or sagging phenomenon can be prevented, and the spraying can be carried out smoothly. Become.

Furthermore, since the foam is formed within the housing, not only is there no deterioration in the pumping performance during inflow, but there is no expansion of the inflowing fluid, and the diameter of the pumping hose can be small, resulting in low cost and efficiency.

In addition, since the porosity of the bubble generating element is extremely high, the foaming efficiency is sufficient, the volume of the housing is small, which is advantageous in terms of space economy and equipment cost, and there are many advantages in terms of device design. be.

Furthermore, there is no need for a power source or rotation mechanism for the rotating shaft, and there is no need to use foam elements with complicated shapes.
By considering the size of the holes and the internal density of the bubble generating element, it can be adapted to the foaming of all kinds of fluids, foaming two or more fluids almost uniformly, and achieving the degree of foaming that suits the intended purpose. Foaming fluid can be obtained efficiently.

In addition, as there is no power part as mentioned above, the shape of the foaming element is simplified, and the structure is extremely simple.Moreover, there are no worn parts or deformed parts, so it is difficult to break down, has excellent durability, and has a long service life. can be provided at low cost.

Furthermore, since the porosity is extremely high, the foaming efficiency of multiple fluids is significantly improved, and a foaming fluid with excellent uniformity can be obtained.

Furthermore, since the bubble generating elements need only be randomly arranged within the housing, loading and replacing operations can be carried out extremely quickly and easily.

Furthermore, since it is static and does not require a rotating mechanism, the structure is simple and compact, and no separate power source is required, significantly reducing not only equipment costs but also running costs.
The effect is extremely large.

[Brief explanation of the drawing]

FIG. 1 is a partially vertical layout view of a first embodiment of a static foaming device according to the present invention. FIG. 2 is a longitudinal sectional front view of the bubble generating element used in the device G. FIG. 3 is a partially vertical layout diagram of a second embodiment of the static foaming device according to the present invention. 1...Housing 1b...Outflow side end face 2a...Through hole 4...Intermediate space 6...Material inlet 8... Air inflow pipe 10...Bubble outflow pipe 12...Material supply pump 14...Second material inflow pipe 16...Second material inflow port 18...Air pipe 20...First material pipe A ... Air C ... Foaming fluid F ... Second material

Claims (8)

[Claims] (1) A bubble generating element is installed inside a hollow housing having an inlet and an outlet, and bubbles are generated when multiple fluids pass through the housing. a foam generating device, wherein a plurality of the inflow ports are separately provided on an end face or side wall on an inflow end side of the housing, and the outflow port is provided on an end face or side wall on an outflow end side of the housing, Moreover, the static foam generating device is characterized in that a large number of foam generating elements are arranged inside the housing. (2) The bubble generating element has a through hole through which a fluid can flow, and is located in the housing so that the flow of the fluid flowing through the gap between the bubble generating elements and the through hole is changed so that the fluid can flow through the hole. Claim 1, wherein a large number of the bubble generating elements are randomly arranged within the housing so that the bubble generating elements are substantially uniformly mixed.
Static foam generator as described. (3) A plurality of fluids are caused to flow into the housing separately from a plurality of inlets, and the fluids are caused to collide, disperse, and flow through the through holes of a large number of bubble generating elements and the gaps between the bubble generating elements. The state of bundle branching, merging, swirling, etc., spiral flow, or reverse state is made, and the direction of the flow is varied in various places.By changing the flow, multiple fluids are uniformly foamed, and a foam flow is created as a foamed fluid. 3. The static foam generating device according to claim 1, wherein the foam is caused to flow down from an outlet. (4) The static foam generating device according to any one of claims 1 to 3, wherein the foam generating element is a hollow cylinder. (5) An air inflow pipe equipped with an air supply pump and a material inflow pipe equipped with a material supply pump are respectively connected to the plurality of inflow ports, and a foam outflow pipe is connected to the outflow port. The static foam generating device according to claim 1, characterized in that the static foam generating device is connected. (6) The plurality of inlets include a first material inflow pipe to which an air inflow pipe equipped with an air supply pump and a material inflow pipe equipped with a material supply hopper are connected, respectively, and a second material inflow pipe equipped with a material supply pump. 2. The static foam generating device according to claim 1, wherein the material inflow pipes are connected to each other separately, and a foam outflow pipe is connected to the outlet. (7) A plurality of fluids are caused to flow into the housing separately from a plurality of inflow ports, and the fluids collide, disperse, and flow through the through holes of a large number of bubble generating elements and the gaps between the bubble generating elements. The state of bundle branching, merging, swirling, etc., spiral flow, or reverse state is made, and the direction of the flow is varied in various places.By changing the flow, multiple fluids are uniformly foamed, and a foam flow is created as a foamed fluid. A static foam generation method characterized by flowing down from an outlet. (8) Air is supplied by the operation of the air supply pump and the first material is supplied by the operation of the material supply hopper, and the mixture is mixed by the injector and flows into the housing from the first material inlet through the first material inflow pipe. At the same time, the second material is supplied to the second material through the second material inflow pipe by the operation of the supply pump.
8. A method for static foam generation according to claim 7, characterized in that the foaming fluid is caused to flow into the housing from the material inlet and further to flow down from the foam outlet to the foam outlet pipe.