JPH05202883A - Suspension feed pump - Google Patents

Abstract

PURPOSE:To always feed a large amount of suspension favorably by taking proper steps such as suspending a casing where an impeller is housed with a motor for forming a pump head integratedly, and holding the pump head so as to be lifted inside a suspension tank. CONSTITUTION:Suspension L is fed from a beaker B to the inside of a flow cell 31 in a particle size distribution measuring device 30 by a suspension feed pump. In the feed pump, a suction port 1b is opened in the center of the bottom part of a tapered part 1c in a casing 1, and a discharge port 1a is opened on the side of its top respectively, in which an impeller 2 is housed. Moreover, the casing 1 is supported to a motor supporting base 4 by plural columns 5. The impeller 2 is supported at the rotating shaft of the motor 3 through a connecting shaft 2a and so forth. A pump head 10 is supported to a vertical traveling mechanism 20 so as to be made to go into/out of the beaker B. It is thus possible to feed a small to large amount of suspension L and set feed flow rate higher.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pump used for feeding a sample suspension to a powder physical property measuring device such as a particle size distribution measuring device or a powder processing device.

[0002]

2. Description of the Related Art In a powder physical property measuring apparatus, mainly a particle size distribution measuring apparatus, a particle size distribution is measured using a suspension in which a powder to be measured is uniformly dispersed in an appropriate medium liquid. As a method of sending such a sample suspension to the measuring device, conventionally, an open type centrifugal pump 130 as shown in FIG. 3A or a peristaltic pump 140 as shown in FIG. 4 is used. The method is adopted. In addition, in FIG.
(b) shows a horizontal cross-sectional view of the impeller arrangement part in (a). Further, in FIG. 4, (a) shows a liquid feeding system using a beaker B as a suspension tank, and (b) shows a liquid feeding system using a wax F.

[0003]

By the way, according to the centrifugal pump shown in FIG. 3, since the bearing of the impeller 132 is not necessary, there is no wear portion due to particles in the liquid, and the impeller 132 is relatively fast. Although there is an advantage that it is possible to rotate the pump casing 131, that is, it is possible to increase the liquid supply flow rate, on the other hand, the pump casing 131 and the suspension tank 131a.
And are integrally formed, the suspension layer 131a
Is difficult to replace, and it is difficult to clean the piping connected to the powder property measuring device 150. Furthermore, since a large amount of liquid is required to be sent, usually 300 cm ³ or more, a small amount of suspension is required. Has the drawback that it cannot be transported.

On the other hand, according to the peristaltic pump shown in FIG. 4, although a small amount of suspension can be transported, in consideration of the durability of the tube 143 which is a pump function part, the rotation speed of the rotor 142, that is, the liquid flow rate. Cannot be set so high that there is a problem that it is difficult to transport coarse particles / heavy particles (particles with large sedimentation).

The present invention has been made in view of the above circumstances, and an object thereof is to be able to cope with liquid feeding of a small amount to a large amount of suspension and to set a large liquid feeding flow rate. The object is to provide a suspension liquid transfer pump having a structure capable of

[0006]

Means for Solving the Problems A configuration for achieving the above object will be described with reference to FIGS. 1 and 2 corresponding to an embodiment. The present invention provides a discharge port 1 a and a suction port 1.
b has a conical taper shape in which the outer surface of the bottom part is contracted downward, and the suction port 1 is provided at the tip part of the taper part 1c.
The casing 1 in which b is arranged, the impeller 2 in which the center of rotation is arranged in the up-down direction inside the casing 1, and the drive motor 3 which is arranged above the casing 1 and which supports the impeller 2 and gives rotation. And a fixing member for positioning and fixing the motor 3 and the casing 1 so that the impeller 2 is held in the casing 1 in a non-contact state (for example, the motor support base 4 and the support 5). And a pump head 10 integrally formed with the pump head 10, and a holder having a structure capable of supporting the pump head 10 such that the center of rotation of the impeller 2 extends substantially in the vertical direction and changing the height of the supporting position. A (vertical movement mechanism) 20 is provided. The pump head 10 is characterized in that it can be put into the sample suspension tank (beaker B) from above.

[0007]

Since the pump head 10 can be charged into the suspension from above, the liquid can be transported even if the suspension is a small amount. Further, the suspension tank can be replaced at the time of washing or the like. Furthermore, even if the impeller 2 is rotated at a high speed, there is no part in which durability is taken into consideration, which makes it possible to increase the liquid delivery amount.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing the configuration of an embodiment of the present invention.
FIG. 4 is a diagram showing a horizontal cross section of a portion where the impeller 2 of the embodiment is arranged.

First, a particle size distribution measuring apparatus 30 to which the present embodiment is applied is a measuring apparatus based on a laser diffraction / scattering method, in which a suspension is flowed inside a flow cell 31 to irradiate a laser beam. The diffraction / scattered light generated by this light irradiation is detected, and the particle size distribution is calculated based on the detection result. Further, the suspension supply system to the particle size distribution measuring apparatus 30 is of a type using a beaker (capacity 300 cm ³ ) B as a suspension tank, and the beaker B containing the sample suspension L is an ultrasonic oscillator. The suspension L inside the bath (not shown) with a child is irradiated with ultrasonic waves for dispersion of the sample.

The liquid delivery pump of the embodiment of the present invention is basically a centrifugal pump, and its pump head 10 is
Casing 1, impeller 2, drive motor 3, connecting shaft 2
a and its joint 2b, the motor support 4 and the column 5, and the piping systems 6a and 6b.

The bottom of the casing 1 has a conical taper shape, and the suction port 1b is located at the center of the taper 1c.
However, the discharge port 1a is also provided on the side of the position where the impeller 2 is arranged.
Are provided respectively. Although not shown, the casing 1 is of a split type for incorporating the impeller 2, and is structured such that the casing is connected and the split portion is sealed by screwing with the O-ring sandwiched between the split surfaces. Has become. Note that examples of the material of the casing 1 include SUS304 and SUS316 depending on the type of liquid medium, and the O-ring used is selected to be suitable for those casing materials.

The casing 1 having the above-mentioned structure is supported on the motor support base 4 by a plurality of support columns 5. Further, the impeller 2 is supported by the rotary shaft of the drive motor 3 via the connecting shaft 2a and the joint 2b, and these fixing members 4 and 5 fix the impeller 2 and the connecting shaft 2a.
Are held in a non-contact state with the casing 1.

The pump head 10 having the above structure is supported by the vertical movement mechanism 20 such that the center of rotation of the impeller 2 is substantially vertical, and the vertical movement mechanism 20 moves the pump head 10 to the beaker B. It is configured so that it can be charged from the upper portion or discharged from the beaker B.

The pump head 10 and the particle size distribution measuring device 30 are connected to each other by the discharge port 1a provided in the casing 1.
Is connected to a liquid inlet 30a communicating with the inside of the flow cell 31 of the measuring device through a pipe 6a and a valve 7a, and a return pipe 6b having a tip portion inside the beaker B is connected to a liquid outlet 30b of the measuring device. Complete by connecting to. Then, after the above connection is completed, the drive motor 3 is driven in a state where the casing 1 is immersed in the sample suspension L in the beaker B, so that the sample suspension L in the beaker B is transferred to the flow cell 31. The suspension L that has been sent to the inside and passed through the cell can be circulated again to the inside of the beaker B. Note that the valve 7a is used during normal circulation.
Is always kept in the "open" state, but when the suspension is discharged, the valve 7a is closed and the discharge valve 7b is opened. Further, in this example, it is impossible to switch the pump head 10 between normal rotation and reverse rotation.

Here, in the above-mentioned embodiment of the present invention, the shape and dimensions of the pump head 10 are set to beakers B having a capacity of 300 cm ³ .
Size that can be thrown into, for example, the diameter of the impeller 2 is 30mm,
If the blade width is set to 12 mm and the impeller 2 of this size is rotated by the motor 3 having a rotation speed of 1200 rpm, the liquid flow rate can be at least about 3 liters / min, and particles with a high sedimentation speed Also, the circulation becomes possible.

Further, in the embodiment of the present invention, the required liquid amount is
For Beaker B with a capacity of 300 cm ³ , its 1/2 to 2/3
(150 to 200 cm ³ ) is sufficient, and while the open-type centrifugal pump shown in Fig. 3 required a liquid volume of 300 to 500 cm ³ , a small amount of suspension can be transported. Become. In addition, since the beaker B can be replaced with the suspension during cleaning, the amount of liquid used can be significantly reduced as compared with the pump having the structure shown in FIG.

Further, since the pump head 10 itself can move in the vertical direction, it is possible to use the beaker B, a wax or a rectangular tank as the suspension tank. The so-called in-line measurement, such as directly inserting the pump head 10 into the suspension line, can be easily performed.

Further, according to the embodiment of the present invention described above, since the bottom of the casing 1 is tapered, the beaker B is
Even if bubbles are generated in the suspension inside, the bubbles do not stay on the bottom surface of the casing 1, and there is a risk that the bubbles may be mixed in the suspension sent to the particle size distribution measuring device 30. Will be less.

In the above embodiments, the vertical moving mechanism 20 is used to support the pump head 10. However, instead of this structure, a simple stand or the like whose holding height position can be changed is applied. However, the present invention can be implemented.

[0020]

As described above, according to the present invention, the rotating portion including the impeller and the shaft, the drive motor for the rotating portion, the casing having a tapered outer surface at the bottom, and the pump head including the piping system are integrated. In addition to the structure, the pump head can be moved in the vertical direction so that the pump head can be charged into the suspension tank from above, so that it is possible to transport a small amount to a large amount of the suspension.
Moreover, the required amount of liquid, especially the amount of liquid required for cleaning, can be greatly reduced compared to the conventional open-type centrifugal pump, which simplifies the cleaning work and reduces the loss time when analyzing various samples. Can be reduced. further,
Since there is no problem in durability even if the flow rate of liquid is increased, it is possible to transport coarse particles and heavy particles (particles with a high sedimentation velocity). There is no restriction on the shape and type of applicable suspension tank, and because the pump head can be moved, it is easy to achieve the application to in-line measurement in the suspension line. There is also.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of a main part showing a configuration of an embodiment of the present invention.

FIG. 2 is a horizontal sectional view of an arrangement portion of the impeller 2 of FIG.

FIG. 3 is a diagram for explaining a conventional example of a liquid feeding system for a sample suspension.

FIG. 4 is a diagram for explaining a conventional example of a method of sending a sample suspension.

[Explanation of symbols]

 10 ... Pump head 1 Casing 1a Discharge port 1b Suction port 1c Tapered portion 2 Impeller 2a Connection shaft 2b・ ・ Joint 3 ・ ・ ・ ・ Drive motor 4 ・ ・ ・ ・ ・ ・ Motor support 5 ・ ・ 5 ・ ・ ・ ・ Post 6a ・ ・ ・ ・ Outward pipe 6b ・ ・ ・ ・ Return pipe 20 ・ ・ ・ ・ Up / down moving mechanism 30 ··· Particle size distribution measuring device 31 ··· Flow cell B ··· Beaker (suspension tank) L ··· Sample suspension

Claims (1)

[Claims] 1. A casing having a discharge port and a suction port, an outer surface of a bottom portion having a conical taper shape that is reduced downward, and the suction port being arranged at a tip end portion of the tapered portion, and a casing of the casing. Inside, an impeller whose center of rotation is arranged along the up-down direction, a drive motor which is arranged above the casing, supports the impeller, and gives rotation, and the motor and the casing, the impeller A pump head integrally formed with a fixing member for positioning and fixing both of them so as to be held in a non-contact state in the casing, and the pump head has a rotation center of the impeller in a substantially vertical direction. It is equipped with a holder having a structure that can be supported along and that can change the height of its supporting position. A suspension liquid delivery pump configured so that it can be fed from above.