JPH04260429A - Powder and liquid mixing apparatus - Google Patents

Abstract

PURPOSE:To operate continuously for a long span of time by providing the upper opening periphery of a funnel within a liquid tank, fixing said upper opening periphery of the funnel approximately at a level to permit a liquid fed into the liquid tank to run down the inclined inside wall of the funnel in the form of a film and providing a power feed opening to drop powder to the inclined inside wall of the funnel. CONSTITUTION:The upper opening periphery 2c of a funnel 2 is situated within a liquid tank 3, said upper opening periphery 2c is fixed approximately at a level and a powder feed opening 8a is provided upwards of said upper opening periphery 2c. A liquid fed into the liquid tank 3 flows from the upper opening periphery 2c to an inner inclined wall 2a in the funnel 2, running down said inclined wall 2a in the form of a film. Then, powder is dropped from the feed opening 8a to the inclined wall 2a and said powder is mixed into the liquid running down in the form of film. Accordingly, even if the liquid is at a high temperature, only a small amount of heat is allowed to reach the powder feed opening, the powder feed opening is not clogged by powder and it is possible to operate continuously for a long span of time.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to an apparatus for mixing powder and liquid while continuously supplying them simultaneously, and is used, for example, to premix powder and liquid supplied to a stirring mixing tank. Ru.

0002

2. Description of the Related Art A mixing device for powder and liquid includes, for example, as shown in FIG. Inside the stirring mixing tank 101, a device is used in which powder and liquid are mixed and dissolved by rotation of stirring blades 104.

[0003] Furthermore, as a mixing device for powder and liquid, there is one disclosed in Japanese Patent Publication No. 30409/1983.

[0004] As shown in FIG.
A funnel 112 is arranged on the top of the powder supply port 1, and an annular powder supply port 113 is formed above the funnel 112.
An annular liquid supply port 114 is formed on the outer periphery of the liquid supply port 13. The powder supply port 113 is formed by arranging a conical guide member 115 within the lower opening of the powder supply pipe 116.

[0005] The liquid a supplied from the liquid supply port 114 flows down along the inner surface of the funnel 112 in the form of a film. Further, powder falls onto the inner surface of the funnel 112 from the powder supply port 113. As a result, the liquid and powder are mixed, and the mixed liquid and powder are supplied to the stirring mixing tank 111.

[0006] Furthermore, as a mixing device for powder and liquid, there is one disclosed in Japanese Patent Publication No. 56-35685.

As shown in FIG.
A liquid tank 122 is provided above the liquid tank 21, and an upper opening of a funnel 123 is disposed inside the liquid tank 122. Further, a powder diffusion member 124 is disposed inside the funnel 123, and a powder supply port 125 is provided above the powder diffusion member 124.
is located. Since the periphery of the upper opening of the funnel 123 is in a substantially horizontal plane, the liquid supplied to the liquid tank 122 is supplied to the inner peripheral side inclined surface 123a of the funnel 123.
Flows down in a film form.

[0008] Then, by dropping the powder from the powder supply port 125, the powder collides with the powder diffusion member 124 and falls onto the inner peripheral side inclined surface 123a of the funnel 123. As a result, the powder and the liquid flowing in the form of a film on the inner peripheral side inclined surface 123a of the funnel 123 are mixed, and the mixed powder and liquid are supplied to the stirring mixing tank 121.

[0009]

[Problems to be Solved by the Invention] In the mixing apparatus shown in FIG. 2, powder and liquid are directly supplied to the stirring mixing tank 101, so that the powder on the liquid surface is absorbed inside the stirring mixing tank 101. It reaches the liquid surface periphery 101a, and powder tends to adhere to this area. Furthermore, fine powder and dust fly up inside the stirring mixing tank 101, and the inner surface 1 of the gas phase part inside the stirring mixing tank 101
01b, particularly on the upper inner surface 101b', adhesion or accumulation of powder occurs. Further, if vapor is generated due to vaporization of the liquid or reaction between the liquid and the powder, the powder adheres and accumulates on the powder supply pipe 102 due to the liquid condensed on the powder supply pipe 102.
There is a problem that the system becomes blocked and cannot be operated continuously for a long time.

In the mixing device shown in FIG.
The guide member 115 inside the powder supply port 113 gets wet due to scattering or seepage of the liquid flowing down from the powder supply port 113. Therefore,
Powder adheres and accumulates on the guide member 115, causing the powder supply port 113 to become clogged, resulting in a problem that continuous operation for a long period of time cannot be performed. Moreover, since the liquid flows down from the annular liquid supply port 114 in the form of a liquid film, the space below the powder supply port 113 is cut off from the atmosphere. Therefore, when vapor is generated due to the vaporization of the liquid or the reaction between the liquid and the powder, the vapor cannot escape into the atmosphere and enters the powder supply pipe 116, and the condensed liquid causes the powder supply pipe 116 to There is a problem in that powder adheres to the inside of the powder supply pipe 116 and causes blockage in the powder supply pipe 116. Furthermore, when the liquid has a high temperature and the powder has a low melting point, the supply pipe 1 that partitions the liquid supply port 114 and the powder supply port 113
There is a problem in that 16 becomes high temperature due to heat conduction from the liquid, and the powder is fused.

In the mixing device shown in FIG.
The powder dispersion member 124 is caused by the liquid that scatters when flowing into the
gets wet. Therefore, the powder spreads through the powder diffusion member 124.
As a result, the space between the powder dispersion member 124 and the inner circumferential inclined surface 123a of the funnel 123 may be blocked, and the space between the powder dispersion member 124 and the powder supply port 1 may become blocked.
25 may become blocked. Therefore, there is a problem that long-term continuous operation is not possible. Furthermore, when vapor is generated due to vaporization of the liquid or reaction between the liquid and the powder, the powder adheres to and accumulates on the powder diffusion member 124. Further, when the temperature of the liquid is high and the melting point of the powder is low, the distance between the inner peripheral side inclined surface 123a of the funnel 123 and the powder diffusion member 124 is small, so the powder diffusion member 124 becomes high temperature and the powder is There is a problem that the bodies are fused together.

An object of the present invention is to provide a powder-liquid mixing device that can solve the problems of the prior art described above.

[0013]

[Means for Solving the Problems] The present invention is characterized in that the upper opening rim of the funnel is disposed inside the liquid tank,
The periphery of the upper opening of the funnel is on a substantially horizontal surface so that the liquid supplied to the liquid tank flows down the inner sloping surface of the funnel in the form of a film. Also, a powder supply port is disposed above the funnel for dropping the powder onto the inner peripheral side inclined surface of the funnel.

[0014]

[Operation] According to the structure of the present invention, the liquid supplied to the liquid tank overflows from the periphery of the upper opening of the funnel, which is in the shape of a substantially horizontal surface, and flows into the inner peripheral side inclined surface of the funnel. It flows down the inner peripheral side inclined surface in the form of a film with a substantially uniform thickness all around the circumference. Also, on the inner slope of the funnel,
Powder falls from the powder supply port. Thereby, powder and liquid can be mixed without stirring using power.

[0015] Since the liquid is always flowing in the area where the powder and liquid first come into contact, the liquid does not adhere to the area.

The powder supply port is located above the periphery of the upper opening of the funnel, so it is located above the liquid level of the liquid tank. This can prevent the powder supply port from getting wet due to the liquid that scatters when flowing into the funnel. In addition, even if vapor is generated due to vaporization of the liquid or reaction between the liquid and the powder, since the powder supply port is located above the liquid level in the liquid tank, powder will not adhere to the powder supply port. Deposition can be prevented. Further, even if the liquid is at a high temperature, by arranging the powder supply port at a distance from the liquid, the amount of heat transferred from the liquid to the powder supply port can be reduced.

[0017]

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.

The powder and liquid mixing device 1 shown in FIG. 1 includes a funnel 2, a liquid tank 3, and a powder supply device 4.

The funnel 2 has a conical inclined surface 2a on its upper inner circumferential side, a cylindrical surface 2b on its lower inner circumferential side, and an upper opening periphery 2c arranged inside the liquid tank 3.

Liquid is supplied to the liquid tank 3 through a pipe 5. The flow rate of the supplied liquid can be adjusted using a flow control valve (not shown) or the like.

As a result, the liquid supplied to the liquid tank 3 flows into the inside of the funnel 2 from the upper opening periphery 2c of the funnel 2. At this time, the upper opening periphery 2c of the funnel 2 is made approximately horizontal so that the liquid that has flowed into the inside of the funnel 2 flows down as a film having a substantially uniform thickness over the entire circumference of the inner peripheral side inclined surface 2a. It is said to be planar.

If it is difficult to accurately position the upper opening rim 2c on a horizontal plane due to the installation accuracy of the device or the influence of vibrations from other equipment, the upper opening rim 2c of the funnel 2 may be placed on the horizontal plane as shown in the figure. It is preferable to provide a notch 2d in 2c. The shape of the notches 2d is not particularly limited, and may be arranged in a V-shape as shown in the figure, or in a U-shape or a concave shape.

The powder supply device 4 is connected to a powder supply hopper 6, a powder conveyance pipe 7 disposed below the powder supply hopper 6 in a direction transverse to the axis, and the powder conveyance pipe 7. A powder supply pipe 8 whose axis is vertically oriented is provided. A screw feeder 10 that is rotationally driven by an electric motor 9 is arranged inside the powder conveyance pipe 7 . As a result, the powder that has fallen from the powder supply hopper 6 to the powder transport pipe 7 is transported to the right in the figure by the screw feeder 10, and then falls inside the powder supply pipe 8, and this powder supply From the powder supply port 8a at the lower end of the tube 8 to the inner peripheral side inclined surface 2a of the funnel 2
fall on top of. The powder supply port 8a is arranged above the upper opening periphery 2c of the funnel 2.

The lower opening 2e of the funnel 2 is connected to the stirring mixing tank 11.
is inserted inside. The stirring mixing tank 11 is provided with stirring blades 13 rotated by a motor 12 inside thereof. The liquid inside this stirring mixing tank 11 is transferred to the pipe 1
4 and pump 15. Further, a return pipe 16 is branched from this discharge pipe 14, and this return pipe 16 is connected to the liquid tank 3, and is used to collect the liquid discharged from the stirring mixing tank 11 in order to further promote the mixing of powder and liquid. A portion is circulated to the liquid tank 3.

Note that if the distance D between the center of the funnel 2 and the center of the powder supply pipe 8 is too small, mixing of the liquid and powder on the inner inclined surface 2a of the funnel 2 will be insufficient, and the distance D
If it is too large, the powder cannot fall onto the inner peripheral side inclined surface 2a of the funnel 2, and the powder accumulates inside the liquid tank 3. Therefore, the distance D between the center of the powder supply pipe 8 and the center of the funnel 2 is set to an appropriate size so that such a situation does not occur. Specifically, the distance D between the center of the powder supply pipe 8 and the center of the funnel 2 is 1/with respect to the radius R1 of the upper opening of the funnel 2.
4R1 to 3/4R1 is preferred. More preferably 1/
3R1 to 2/3R1 is preferable. Further, the diameter of the powder supply pipe 8 is set to an appropriate diameter depending on the physical properties such as the particle size and bulk density of the powder. Further, the ratio of the radius R2 of the lower opening and the radius R1 of the upper opening is the distance D between the center of the powder supply pipe 8 and the center of the funnel 2,
Set according to the diameter of the powder supply pipe 8, preferably R2/R1
= Set in the range of 0.1 to 0.3.

Furthermore, if the opening angle θ of the inner peripheral side inclined surface 2a of the funnel 2 is too small, the falling speed of the liquid and powder will be too high and sufficient mixing will not be possible. Since powder accumulates on the surface 2a, the surface 2a is appropriately sized to prevent such a situation from occurring. Specifically, the opening angle θ of the funnel 2 is preferably 15° to 90°, more preferably 20° to 60°.

Furthermore, the thickness of the liquid immediately before it flows from the upper opening periphery 2c of the funnel 2 to the inner inclined surface 2a is as follows:
By adjusting the liquid supply flow rate to the liquid tank 3, approximately 0.5
It is preferable to set it as 15 mm. More preferably 1~
10mm is good. If the thickness of the liquid is small, it will not flow as a film with a uniform thickness on the inner inclined surface 2a of the funnel 2, and if it becomes large, the liquid will not flow through the lower opening 2 of the funnel 2.
This is because the liquid overflows at point e and the mixture of powder and liquid cannot be discharged.

Using the mixing device 1 having the above configuration, the temperature of about 20
℃, a viscosity of about 400 cp, and a concentration of 95% by weight, and trimellitic anhydride in the form of flakes having an average length of 2 to 3 mm and containing fine powder were mixed.

The radius R1 of the upper opening of the funnel 2 used for this mixing is 135 mm, and the radius R2 of the lower opening 2e is 30 m.
m, the length L of the inner peripheral side inclined surface 2a was about 380 mm, and the opening angle θ of the inner peripheral side inclined surface 2a was 30 degrees. Further, the number of powder supply pipes 8 was one, and the diameter thereof was two inches. Also, the distance D from the center of the funnel 2 to the center of the powder supply pipe 8
was set to 62.5 mm, which is 1/2 of the upper opening radius R1 of the funnel 2.

Further, the aqueous glycerin solution was supplied to the liquid tank 3 at a flow rate of 600 Kg/Hr. Further, the trimellitic anhydride was continuously supplied at a rate of 50.4 Kg/Hr for 30 hours at room temperature. As a result, the powder supply port 8a was not blocked and there was no problem in powder supply.

Next, using the mixing device 1 described above, trimellitic anhydride in the form of flakes containing fine powder and having an average length of 2 to 3 mm was mixed with a liquid obtained by melting a polyester resin at 210°C.

The radius R1 of the upper opening of the funnel 2 used for this mixing is 31 mm, the radius R2 of the lower opening 2e is 12 mm,
The length L of the inner peripheral side inclined surface 2a was approximately 73 mm, and the opening angle θ of the inner peripheral side inclined surface 2a was 30 degrees. In addition, the powder supply pipe 8
was one, and its diameter was 1/8 inch. Further, the distance D from the center of the funnel 2 to the center of the powder supply pipe 8 was set to 16 mm, which is about 1/2 of the upper opening radius R1 of the funnel 2.

The mixing device 1 and stirring mixing tank 11 were covered with a heating jacket.

[0034] Further, the molten liquid of the polyester resin was supplied to the liquid tank 3 at a flow rate of 20 kg/Hr. Further, the trimellitic anhydride was supplied at a rate of 1.7 Kg/Hr. Then, the mixed liquid put into the stirring mixing tank 11 was heated and dissolved, and the mixed liquid was continuously extracted by the pump 15 for 24 hours. As a result, despite the intense generation of water vapor, no clogging of the powder supply port 8a and no fluctuation in the composition of the liquid extracted from the stirring mixing tank 11 were observed.

According to the above-mentioned mixing device 1, even if the liquid is violently scattered, the water vapor is violently generated due to the reaction between the powder and the liquid, or the water vapor is violently generated from the stirring mixing tank, the powder Occurrence of blockage in the supply port 8a can be prevented.

Note that the present invention is not limited to the above embodiments.

For example, the number of powder supply pipes 8 is not limited to one, but may be plural.

Further, in the above embodiment, a part of the liquid discharged from the stirring mixing tank 11 is circulated to the liquid tank 3 to increase the mixing efficiency of the liquid and powder, but it is not necessarily necessary to circulate the liquid.

Further, the mixing device may be covered with a heating jacket or a cooling jacket to perform heating or cooling depending on the physical properties, handling, usage, etc. of the powder or liquid.

[0040] In addition, the amount of liquid or powder supplied per unit time and the ratio of the amount of liquid and powder supplied depend on the mixing target, such as the ease of forming a liquid film due to liquid physical properties and the ease with which liquid and powder mix. Set as appropriate depending on the situation.

[0041]

According to the mixing device of the present invention, powder and liquid can be mixed without using an agitation mixing tank by dropping the powder into the liquid flowing in the form of a film. In addition, by using it in combination with a stirring mixing tank,
Liquid and powder can be quickly and uniformly mixed without causing the powder to adhere to the inner surface of the stirring mixing tank. Even if there is liquid scattering, liquid vaporization, or vapor generation due to a reaction between liquid and powder, the powder supply port can be prevented from getting wet, and even if the liquid is at a high temperature, the powder supply port can be prevented from getting wet. Since the amount of heat transferred to the powder can be reduced, continuous operation can be performed for a long time without clogging or fusion of the powder supply port by the powder.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the configuration of a mixing device according to an embodiment of the present invention.

[
Fig. 2: Explanatory diagram of the configuration of a conventional mixing device

[Fig. 3] Configuration explanatory diagram of a conventional mixing device

[Fig. 4] Configuration explanatory diagram of a conventional mixing device

[Explanation of symbols]

1 Mixing device 2 Funnel 2a　Inner peripheral side inclined surface 2c Top opening rim 3 Liquid tank 8a　Powder supply port

Claims (1)

[Claims] Claim 1: A periphery of the upper opening of the funnel is disposed inside a liquid tank, and the periphery of the upper opening of the funnel is arranged such that the liquid supplied to the liquid tank flows down the inner peripheral side inclined surface of the funnel in the form of a film. is on a substantially horizontal surface, and a powder supply port is arranged above the periphery of the upper opening of the funnel for dropping the powder onto the inclined surface on the inner peripheral side of the funnel. A device for mixing powder and liquid.