JPS5813208B2 - mixer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention mainly relates to a mixer for stirring and mixing injection grout, cement mortar, chemical grout, etc.

In the past, various mixers have been proposed and put into practical use as the above-mentioned mixers, but when mixing highly viscous solutions using powder, etc., in order to increase the mixing effect, stirring blades are generally arranged in two stages, upper and lower. Many of the provided ones are used.

This is because the viscosity of the solution being mixed is high, so the vertical convection of the solution in the mixing tank is insufficient, and the mixing and agitation especially near the liquid surface is incomplete, causing the powder to become suspended on the liquid surface. This is to prevent this.

However, in a mixer that has two stages of stirring blades, upper and lower, when the solution is discharged from the bottom of the mixing tank after mixing is completed, if the liquid level drops to near the upper stirring blade, the liquid level will be beaten by the stirring blade. There are disadvantages such as the solution scattering and adhering to the inner surface of the upper lid of the tank and the upper part of the inner surface of the tank, and also scattering outside the tank if there is no lid.

In particular, in mixers that use an electrode rod to detect the liquid level during mixing and employ an automatic control method, the scattered solution may adhere to the holding metal fittings of the electrode rod, causing the liquid level detection function to be lost. Very often automatic control becomes impossible.

In addition, the above-mentioned mixer generally discharges the solution after mixing from the bottom of the mixer to the agitator located at the lower stage by utilizing gravity's natural fall.
This means that if a mixing plant is constructed that includes a mixer and an agitator, the height of the machine will inevitably be high, and when transporting the mixing plant by truck, both must be separated and disassembled, making transportation difficult. It's inconvenient.

The present invention was made for the purpose of eliminating and improving the above-mentioned drawbacks of conventional mixers, and its configuration is such that an opening is provided at the center of the bottom of the mixing tank, and a centrifugal pump is connected to the opening in the center of the bottom of the mixing tank. A chamber is provided which accommodates a rotor blade of the structure and rectifies and discharges the mixed liquid flow caused by the rotation of the rotor blade, a stirring blade is placed in the mixing tank, a rotor blade of a centrifugal pump structure is placed in the chamber, and a rotating shaft is installed. A discharge pipe connected to a discharge hole provided in the chamber, and a discharge pipe and a pressure feeding pipe whose tips are introduced above the mixing tank into the mixing tank are switchably connected. It is something.

Next, an example of implementation of the present invention will be explained with reference to the drawings.

1 is a mixing tank, 2 is an opening provided at the center of its bottom, and 3 is a chamber connected to the bottom of the tank that communicates with the opening 2. Mixing is carried out by the rotation of a rotary blade of a centrifugal pump structure, which will be described later. It is designed to rectify and discharge the liquid flow.

4 is a rectifier of the chamber 3, 5 is its discharge hole, 6 is a rotating shaft, 7 is a downward stirring blade located in the mixing tank 1 and fixed to the rotating shaft 6, and 8 is housed in the chamber 3 and rotates. A rotating blade 9 of a centrifugal pump structure is fixed to the shaft 6, and 9 is a bottom cover of the mixing tank 1, and a bearing 11 equipped with a shaft sealing device 10 is provided.
The lower end of the rotating shaft 6 is supported watertightly, and the upper end of the rotating shaft 6 is connected to the electric motor 12.
The output shaft of the reduction gear box 13 is connected to the output shaft of the reduction gear box 13.

Reference numeral 14 is a plywood board to which the reduction gear box 13 is fixed, and is fixedly installed on the mixing tank 1 to support the weight of the rotating shaft 6, stirring blades 7, and rotary blades 8.

15 is a baffle plate installed vertically in the mixing tank 1, 16 is a discharge pipe connected to a discharge hole, and 17 is a discharge pipe connected to the discharge pipe 16, the tip of which is introduced onto the mixed liquid L in the mixing tank 1. has been done.

Reference numeral 18 is a pressure feed pipe, and reference numerals 19 and 20 are two-way cocks provided in the discharge pipes 16 and 17.

The mixer of the present invention, which is configured as described above, is constructed by storing the liquid or liquid and powder to be mixed in the mixing tank 1, and driving the electric motor 12 with the two-way pot 19 closed and the two-way pot 20 opened. The power is transmitted to the rotating shaft 6 via the reduction gear box 13, and the stirring blades 7 and centrifugal pump rotor blades 8 rotate together with the rotating shaft 6 (towards the right when viewed from the top in the figure), and the mixing tank The solution L in 1 generates a radial flow due to centrifugal force in the outer circumferential direction of the stirring blade 7 as shown by the solid arrow, and a downward flow due to the angle of the blade, resulting in vertical convection mixing as a whole. Further, the centrifugal pump rotor 8 sucks the solution L through the opening 2 through its rotation, and imparts velocity energy to the solution L by centrifugal force, which is converted into pressure energy in the rectifier 4 and the solution L is transferred to the discharge hole 5,
It is discharged to the upper part of the liquid level through the discharge pipe 16, the two-way pot 20, and the discharge pipe 17.

Therefore, if there is powder floating on the liquid surface, it is dispersed and stirred by the flow rate of the discharge stream and mixed with the solution L.

That is, the mixer of the present invention aims to improve the mixing effect by synergistically applying the mixing effect of the stirring blade 7 and the mixing effect of the centrifugal pump rotor blade 8 to the melt L, and after the mixing is completed. Two-way Kotoku 2
0 is closed, 19 is opened, and the lift generated by the centrifugal pump rotor 8 is used to transport the liquid from the pressure feed pipe 18 to the next stage agitator.

Therefore, since the agitator which is the next stage of the mixer of the present invention can usually be placed on the same plane as the mixer,
The required lifting height of the centrifugal pump rotor 8 is approximately several meters.

In the above embodiment, the number of discharge ports of the discharge pipe 17 is one, but the discharge port may be divided into several parts as necessary.

The present invention is as described above, and since the mixing effect of the stirring blade and the mixing effect of the centrifugal pump are synergistically applied to the solution to be mixed, not only the mixing effect is significantly improved, but also the mixing is completed. After that, during the mixing night, the mixture was discharged from the centrifugal pump rotor storage chamber, which was connected to the lower opening of the mixing tank.
There is no risk of scattering when discharging, and the agitator, which is the next stage after the mixer, can be installed on the same plane as the mixer.
The lifting height of the centrifugal pump rotor blades is small, the structure is simple, and it is possible to configure a mixing plant of the same level for both systems, making it extremely convenient to transport the plant. It has practical and economical effects that cannot be expected from a mixer.

[Brief explanation of drawings]

The figure is a longitudinal sectional front view of the mixer of the present invention. 1... Mixing tank, 2... Bottom center opening, 3... Chamber, 4... Rectifier, 5...
...Discharge hole, 6... Rotating shaft, 7...
Stirring blade, 8... Centrifugal pump rotor blade, 9...
...Bottom cover, 12...Electric motor, 13...
...Reduction gear box, 16,17...Discharge pipe,
18...Pressure pipe, 19,20...Two-way cock, L...Solution.

Claims (1)

[Claims] 1. An opening is provided in the center of the bottom of the mixing tank, and a chamber is provided in communication with the opening to house a rotary blade of a centrifugal pump structure, and to rectify and discharge the mixed liquid flow caused by the rotation of the rotary blade. A rotary blade of a centrifugal pump structure is arranged in the mixing tank, and a rotary blade of a centrifugal pump structure is fixed to the rotating shaft, and a discharge pipe is connected to the discharge hole provided in the chamber, and the tip is connected to the upper part of the mixed liquid in the mixing tank. A mixer characterized in that a discharge pipe and a pressure feeding pipe introduced into the mixer are switchably connected.