JP2003305351A - Fluid mixing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fluid mixing device in which a main agent does not flow back into any portion of a secondary flow passage even when the supplying pressure of the main agent is higher than that of the secondary agent. <P>SOLUTION: The in-line fluid mixing device 1 is constituted in such a way that a mixing head 21 is provided with a first flow passage 22 and a second flow passage 23 which does not join with the first flow passage 22, that the second flow passage 23 is provided with a discharge part at its end, and that the mixing head 21 is connected to a mixer portion 31 so that the end part of the first flow passage 22 and the discharge part of the second flow passage 23 are on the upper face of the mixer portion 31. A flow passage is installed inside the discharge part in which a second fluid flows in an axial direction and reaches discharge holes at the peripheral surface covered with an elastic body. A gap is formed between the peripheral surface and the elastic body by a discharging pressure of the second fluid owing to the elastic body, thereby the second flow being discharged. When the discharging pressure decreases, the peripheral surface is closed by the elastic force owing to the elastic body. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for mixing two or more kinds of fluids used for various applications such as paints, pigments, foods, medicines and the like.

[0002]

2. Description of the Related Art Conventionally, it has been general practice to continuously mix two or more fluids with an in-line type mixer. For example, the mixing device of FIG. 7 is prepared as a continuous mixing device used for the purpose of continuously mixing the resin as the main agent and the curing agent as the second agent and supplying the mixture to the next step. Kaihei 10-337459).

In FIG. 7, the mixing device 80 comprises a mixing head portion 82 and a mixer portion 92. The mixing head portion 82 has a flow path 88 for the main agent MA.
Further, a flow path 89 for the second agent MB is provided, and a check valve is provided for each flow path to prevent the main agent and the second agent from flowing back to the upstream inflow pipe. The flow path 88 has a terminal end for discharging the main agent onto the upper surface of the mixer section 92.
It is 5. A discharge port 83 for discharging the second agent into the main agent is provided at the end of the flow channel 89. A rotating shaft 84 is provided at the center of the mixing head portion 82.

The mixer section 92 comprises a stirring blade 94 and a cylindrical casing 93 which is longer in the axial direction than its diameter. The stirring blade 94 is connected to the rotating shaft 84 and rotates during the mixing operation.

A check valve 86 is provided in the middle of the flow path 89 in order to prevent a curing reaction and the like in the flow path 89 due to the backflow of the main agent.

[0006]

However, the check valve 86 provided in the flow passage as shown in FIG. 7 has a certain effect in that the backflow of resin or the like from the check valve 86 to the upstream side can be prevented. Although confirmed, it was not possible to prevent the resin and the like from flowing into the flow path between the check valve 86 and the discharge port 83. Further, since the discharge port 83 shown in FIG. 7 is opened downward, when a hardener having a larger specific gravity than resin is used, even if the check valve 86 functions, the check valve 86 and the discharge port are The hardener remaining in the flow path between the channels 83 sinks, and the resin is likely to be replaced and flow into the flow path. As described above, in the check valve 86 shown in FIG. 7, it is considered that the curing reaction of the resin locally occurs particularly in the flow channel between the check valve 86 and the discharge port 83, and as a result, the cured resin flows in the flow channel. May narrow or block.

In particular, when a pulsating pump such as a plunger pump is used to ensure the quantitativeness of the two fluids, the difference in stroke cycle between the two pumps causes the supply pressure of the resin to be different from that of the curing agent. There is a timing when the pressure becomes higher than the supply pressure, and the resin easily flows back into the flow path of the curing agent.

[0008] The curing of the resin in the flow path of the curing agent is a cause of the poor quality of the product in the next step if the cured resin peels off and is sent to the next step, in addition to the problem of narrowing the flow path of the curing agent Will also be.

The present invention has been made in view of the above problems, and is an improvement of the conventional mixing apparatus shown in FIG. 7, in which even if the supply pressure of the main agent is higher than the supply pressure of the second agent, Two
It is an object of the present invention to provide a fluid mixing device in which the main agent does not flow back to any part of the agent flow path.

[0010]

The method according to the invention of claim 1 comprises a mixing head section and a mixer section,
A first fluid is passed through the mixing head portion.
And a second flow path through which a second fluid does not merge with the first flow path, and a discharge part is provided at the end of the second flow path. The section has a cylindrical shape and is long in the axial direction, and the end of the first flow path and the discharge section of the second flow path in the mixing head section are located above the mixer section. The in-line fluid mixing device for continuously mixing the first fluid and the second fluid, which is formed by connecting the mixing head section and the mixer section as described above, wherein the discharge section is , Has a substantially columnar shape, and is provided therein with a flow path for allowing the second fluid to flow in the axial direction and reaching a discharge port existing on the peripheral surface of the discharge portion, and the peripheral surface It is covered with an elastic body, and the elastic body is deformed by the discharge pressure of the second fluid and When the second fluid is discharged by forming a gap with the peripheral surface of the discharge section and the discharge pressure of the second fluid is reduced, the peripheral surface of the discharge section is elastically deformed. It is provided so as to cover.

In the apparatus according to the second aspect of the present invention, the discharge part can be attached and detached at the end of the second flow path. In the apparatus according to the invention of claim 3, the elastic body is a cylindrical rubber.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a diagram showing a configuration of a main part of a mixing device 1 according to an embodiment of the present invention, FIG. 2 is a diagram showing an outline of the entire mixing device 1, and FIG. FIG. 4 is a side sectional view of the device 11, and FIG. 4 is a top plan view of the discharge device 11 of FIG.

In FIG. 1 and FIG. 2, the mixing device 1 is
The mixing head unit 21, the mixer unit 31, and the drive unit 41 that drives the rotary shaft 24 are included. This mixing device 1
Is used for continuously mixing two different fluids at a large mixing ratio, and in FIG.
Fluid MA and the second fluid MB having a small flow rate are quantitatively sent to the mixing head portion 21 via the pipes.

The mixing head portion 21 includes a first flow passage 22 through which the first fluid MA passes, a check valve 27 provided in the first flow passage 22, and a second passage through which the second fluid MB passes. In addition to having a flow path 23 and a check valve 26 provided in the second flow path 22 inside, a rotary shaft 24 for driving the rotary blades 33 and the discharge device 11 are provided.

When the first fluid MA and the second fluid MB have reactivity such as a resin and a curing agent, if both fluids merge in the flow path of the mixing head portion 21, the fluid cures. Since there is a possibility that the reaction is started and the flow path is blocked by the cured resin, in the mixing head portion 21, the first flow path 22 and the second flow path 23 are formed.
The structure does not merge with.

The main body of the mixing head portion 21 is made of stainless steel, but it can be made of iron or another material. In FIG. 3, the discharge device 11 includes a discharge part 12 and an elastic body 17.

The discharge part 12 has a substantially columnar shape, and has a flow path 15 for sending the second fluid MB flowing axially from the upper surface downward as it is, and an opening on the peripheral surface connected to the flow path 15. The plurality of discharge ports 13 provided in the second fluid M
And a plurality of radial channels 16 for distributing B.
The discharge part 12 is made of stainless steel, but can be made of iron or other metal.

The discharge ports 13 are opened at intervals of 90 degrees in the circumferential direction on the peripheral surface of the discharge portion 12, and discharge the second fluid MB passing through the flow path 16 into the first fluid MA. To do. The shape of the discharge port 13 is circular.

The elastic body 17 is formed of cylindrical rubber as shown in FIG. The inner diameter of the elastic body 17 in the free state is
It is smaller than the outer diameter of the substantially cylindrical peripheral surface recess 14 in which the discharge port 13 is provided. The elastic body 17 is fitted into the peripheral surface recess 14 in an expanded state. As a result, the four discharge ports 13
Is covered by the elastic body 17. Due to the discharge pressure of the second fluid MB, the elastic body 17 extends, and a gap is formed between the inner circumferential surface of the elastic body 17 and the circumferential recess 14 to the extent that the second fluid MB can pass. The thickness of the elastic body 17 and the type of rubber are selected so that an appropriate gap is generated.

By configuring the elastic body 17 in this way, when the discharge pressure of the second fluid MB is higher than the pressure of the first fluid MA, the elastic body 17 expands to cause the second fluid body to expand. MB is discharged into the first fluid MA. On the contrary, when the discharge pressure of the second fluid MB becomes lower than the pressure of the first fluid MA, the elastic body 17 contracts and is pressed against the entire surface of the peripheral concave portion 14 so that the discharge port 13 is discharged. It can be completely covered to prevent the first fluid MA from flowing into the discharge port 13.

The discharge device 11 has a diameter of about 3 mm and a length of about 9 mm. A screw thread is cut in a nipple shape on the upper portion of the discharge portion 12, and is screwed into a screw groove provided at an end portion of the flow path 23 of the mixing head portion 21 to be attached to the mixing head portion 21. A groove for engaging and rotating a driver is provided on the lower surface of the ejection device 11. By making it possible to easily attach and detach the discharge device 11 to and from the mixing head portion 21, it is possible to adjust the discharge device 11 according to the flow rate and viscosity of the second fluid MB.
The discharging device 11 having the discharging port 13 suitable for them can be appropriately replaced, and the versatility as a mixing device is obtained.

The mixer section 31 has a cylindrical casing 32 which is longer in the axial direction than its diameter, and a casing 32 as a whole.
And a rotary blade 33 having a spiral blade having substantially the same length as the above.

The casing 32 and the rotary blades 33 in this embodiment are both made of resin, but both can be made of metal, and the first fluid MA and the second fluid MB are corrosive. Depending on the nature and operating pressure of the mixing section 31, glass may be used for the casing 32.

The casing 32 has an outer diameter of about 12 millimeters and a length of about 220 millimeters. Rotary vane 33
Is connected to a rotary shaft 24 provided in the mixing head portion 21, and the viscosity of the first fluid MA and the first fluid MA are
And the second fluid MB, depending on the degree of ease of mixing,
The presence or absence of rotation and the number of rotations are determined.

When the viscosity of the first fluid MA is low and the mixing with the second fluid MB is easy, the length of the rotary blade 33 is shortened and the other portion of the casing 32 is reduced. It may be configured as a static mickey. Further, when the apparatus 1 is used only for mixing such fluids, a static mixer is used instead of the casing 32 and the rotary blade 33, and the mixing head portion 21 is provided with the rotary shaft 2.
It is also possible to adopt a configuration in which 4 is not provided.

Mixing head section 21 and mixer section 31
Can be easily attached and detached. For example, the cured resin adheres to a part of the mixer to create a dead space, and the resin stays in that part and the curing reaction locally proceeds. When the problem occurs, the mixer unit 31 can be replaced. In addition, the rotary shaft 24
Since the rotary blade 33 and the rotary blade 33 are detachable, the rotary blade 33 can be replaced with one having a shape according to the property of the fluid to be mixed.

In the embodiment shown in FIG. 1, the discharge device 11
Is arranged at a position apart from the main ejection surface 25 on which the first fluid MA is ejected. The mixing head portion 21 and the mixer portion 31 are the main ejection surface 25 of the mixing head portion 21.
The discharge device 11 is integrated so as to be located above the cylindrical casing 32 of the mixer section 31, and the first fluid MA and the second fluid MB merged here are mixed in the mixer section 31. Flows downward in FIG.

As an example of the operating conditions of the mixing apparatus 1, the supply amount of the first fluid MA to the mixing head portion 21 is about 100 ml / min, and the supply amount of the second fluid MB to the mixing head part 21 is about / min. It is 1.0 ml.

Next, the operation of the elastic body 17 will be described with reference to FIG. 6 in the case where the plunger pump pulsating the second fluid MB is supplied. When the plunger pump starts to discharge the second fluid MB, the second fluid MB inside the discharge portion 12 having the increased pressure is pushed to the elastic body 1
The portion of the nozzle 7 that covers the discharge port 13 bulges outward (see FIG.
(A)), the second fluid MB is directed in the two upper and lower directions of the elastic body 17 having relatively low resistance to rubber elongation, and the elastic body 17 is eventually discharged and extruded by the second fluid MB. Swells in the radial direction over the entire circumferential recess 14. Then, the second fluid MB flows out of the ejection portion 12 via the gap between the inner peripheral surface of the swollen elastic body 17 and the peripheral surface concave portion 14 (FIG. 6B), and the second fluid flows. The body MB meets and is mixed with the first fluid MA.

When the discharge pressure of the second fluid MB becomes lower than the pressure of the first fluid MA, the first pressure remaining between the peripheral surface concave portion 14 of the discharge portion 12 and the inner peripheral surface of the elastic body 17 remains. The fluid MB of No. 2 is pushed outward from the peripheral surface recess 14 by the force of the elastic body 17 to contract (FIG. 6C), and the elastic body 17 covers the entire peripheral surface recess 14 of the discharge part 12 ( Figure 6
(D)). The periphery of the discharge port 13 is covered with the elastic body 17, and prevents the first fluid MA having a higher pressure than the second fluid MB from flowing into the discharge port 13.

As described above, in the mixing apparatus 1 of the present embodiment, even when the discharge pressure of the second fluid MB decreases, the elastic body 17 causes the second fluid MB to flow in the first fluid. Since the first fluid MA is blocked by the ejection port 13 immediately before being ejected into the body MA, the first fluid MA does not flow back into the ejection device 11.

As shown in FIG. 4, the discharge ports 13 are provided at four locations on the circumferential surface of the discharge section 12 so as to open at intervals of 90 degrees in the circumferential direction, and the discharge flow rate and viscosity of the second fluid MB are set. The number of discharge ports 13 and the cross-sectional area thereof are appropriately changed depending on the difference in viscosity from the first fluid MA and the ease of dispersion or dissolution in the first fluid MA.

The opening shape of the discharge port 13 is not limited to the circular shape. Synthetic rubber is used for the elastic body 17, but the material is not limited to rubber, and the peripheral surface concave portion 1 of the discharge portion 12 in a contracted state is used.
It is possible to use a member that covers 4 and forms a gap with the peripheral surface concave portion 14 of the discharge portion 12 in an expanded state. Further, instead of the peripheral surface concave portion 14 provided so as not to drop the elastic body 17 from the discharge portion 12, another structure may be adopted for preventing the elastic body 17 from falling off, or the peripheral surface concave portion 14 may not be provided.

In the above-described embodiment, the mixing head section 21 is not provided with the rotary shaft 24 for driving the rotary blades 33, and the mixer section 31 is not provided with the rotary blades 33, but a general static mixer is used. You can The mixer unit 31 includes a first fluid MA and a second fluid MB.
The lengths of the casing 32 and the rotating blades 33 can be appropriately changed in consideration of the ease of mixing of the above. Further, the shape of the rotary blades 33 of the mixer section 31 is not limited to those having spiral blades, but is appropriate depending on the static mixer element itself, the physical properties such as the viscosity of the two fluids, and the ease of mixing. Can be changed to

When it is necessary to mix the third fluid as well, the flow path for the third fluid is set to the second fluid MB.
In the same way as the flow path 23 of the inside of the mixing head portion 21,
Further, it can be provided.

In the above embodiment, the mixing head portion 21, the mixer portion 31, the first flow passage, the second flow passage,
Internal flow paths 15 and 16 in the discharge device 11 and the discharge part 1
2. The form, structure, shape size, number, and material of the discharge port 13 and the elastic body 17 can be appropriately changed according to the spirit of the present invention.

[0037]

According to the present invention, the supply pressure of the main agent is the second.
It is possible to provide a fluid mixing device in which the main agent does not flow back to any part of the flow path of the second agent even when it is higher than the supply pressure of the agent.

[Brief description of drawings]

FIG. 1 is a diagram showing a part of a configuration of a mixing apparatus according to the present invention.

FIG. 2 is a diagram showing a configuration of a mixing device according to the present invention.

FIG. 3 is a side cross-sectional view of a discharge device according to the present invention.

FIG. 4 is a plan view of a discharge device according to the present invention.

FIG. 5 is a view showing a cylindrical rubber used as an elastic body for carrying out the mixing apparatus according to the present invention.

FIG. 6 is a diagram showing an operation of a cylindrical rubber used as an elastic body according to an embodiment of the present invention.

FIG. 7 is a diagram showing a conventional mixing device.

[Explanation of symbols]

1 Fluid mixing device 12 Discharge part 13 Discharge port 14 Peripheral surface of discharge part (recessed surface) 17 Elastic body (cylindrical rubber) 21 mixing head 22 First flow path 23 Second channel 31 Mixer section

Claims (3)

[Claims] 1. A mixing head part and a mixer part, wherein the mixing head part has a first flow path through which a first fluid passes, and a second flow path that does not merge with the first flow path. A second flow passage through which a body passes is provided, a discharge portion is provided at an end of the second flow passage, and the mixer portion has a cylindrical shape and is long in the axial direction. A first end of the first flow path in the head part and the discharge part of the second flow path are connected to the mixing head part and the mixer part so that they are located above the mixer part; Is an in-line type fluid mixing device for continuously mixing the fluid and the second fluid, wherein the discharge part has a substantially cylindrical shape, and the second fluid is provided inside the discharge part. Flow path to reach the discharge port on the peripheral surface of the discharge section. By being provided, the peripheral surface is covered with an elastic body, and the elastic body is deformed by the discharge pressure of the second fluid and forms a gap between the elastic body and the peripheral surface of the discharge section. When the second fluid is discharged and the discharge pressure of the second fluid is reduced, it is provided so as to cover the peripheral surface of the discharge section with its elastic force. Mixing device. 2. The mixing device according to claim 1, wherein the discharge part is attachable / detachable at an end of the second flow path. 3. The elastic body is a cylindrical rubber. The mixing device according to claim 1 or 2.