JP2585248Y2 - Powder flow meter - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a powder flow meter used for measuring a flow rate in a pipe for conveying powder.

[0002]

2. Description of the Related Art A powder flow is applied obliquely downward to a vertical impact plate.
A flow meter for measuring the flow rate of a granular material by measuring a horizontal component force of an impact load generated at that time by a force sensor such as a load cell is known from, for example, Japanese Patent Application Laid-Open No. Sho 57-189013.

[0003] In the measurement by this method, even if the flow rate changes, the flow rate can be accurately measured if the flow state at the time of collision of the granular material with the impact plate can be measured, so that the flow state can be stabilized. Is important. On the other hand, it is necessary for this type of particulate flowmeter to have a structure as small as possible and to be able to be installed in any place where installation is bad. Further, the flow path is conventionally generally plate-shaped or U-shaped.

[0004]

[Problem to be Solved by the Invention] In order to reduce the size of the powder flow meter and enable the measurement of minute amounts, and to ensure the stable flow of the powder at the time of collision with the impact plate. In this case, the gap between the tip of the guide chute having the inclined flow path and the impact plate should be as close as possible. When the amount of the powder is very small, it is desirable to reduce the gap as much as possible because the horizontal speed tends to decrease due to air, and it is desirable to use a thin thread-like lump flow to stabilize the flow of the powder itself. .

However, if the gap between the tip of the guide chute having the inclined flow path and the impact plate is reduced, there is no problem in the normal flow of the granular material, but a large amount of irregular flow or abnormal flow occurs. In the case of (1), the granular material is clogged in the gap between the tip of the guide chute and the impact plate, and the function of transporting the granular material cannot be performed.

Conventional powder flow meters do not take this point into account. That is, since the measurement of the minute amount has a large error, if this gap is made small, it occasionally becomes a hindrance to the conveyance of the granular material and is clogged. For this reason, this type of flow meter is usually provided with a bypass circuit.

[0007] The present invention has been made in view of the above points, and when the granular material generates an irregular flow or a large amount of flow in the pipeline, even if the metering operation of the flow meter cannot be temporarily performed. It is another object of the present invention to provide a powder flow meter which does not need to provide a bypass circuit by having a structure in which a pipe is not clogged at a place where a flow meter is installed.

[0008]

In order to solve the above-mentioned problems, the present invention reduces the horizontal component of the impact load generated when the guide chute having the inclined flow path of the granular material descends and hits the vertical impact plate. In the granular material flow meter that measures the flow rate of the granular material by measuring, the guide chute is used to prevent the granular material from being blocked at the tip of the guide chute.
It has a U-shaped bottom surface, and has an opening for overflowing powder and granules near the tip of the guide chute, and a central bottom of the opening for overflow.
It has a bellows-like part at the tip of the part .

The present invention is further characterized in that the guide chute has a conical cross section.

[0010]

[Function] The particles clogged in the gap between the end of the guide chute and the impact plate and the particles to be clogged overflow from the overflow opening of the guide chute and fall. There is no clogging and stagnation, and transport is performed continuously without interruption.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on embodiments.

FIG. 1 is a sectional view of a powder flow meter according to the present invention.

The powder flow meter of the present invention is incorporated in the middle of a powder transport pipe (not shown). That is, the guide chute 1 is connected to the upper transfer pipe. FIG. 2 is a perspective view of the guide chute 1. The guide chute 1 has a large-diameter inlet 2 and a U-shaped outlet having a small-diameter outlet, which is an overflow opening 7.
It has a hollow conical shape with a bottom shape of the mold, and has an inclined flow path through which the granular material flows inside. Also, the guide chute 1
The tip of the overflow opening 7 is a tongue-shaped bellows-like portion 8. The lower part of the guide chute 1 is connected to the main body 3. The guide chute 1 extends to the inside of the main body 3. A force sensor 6 such as a load cell is fixed to an outer wall of the main body 3. The impact plate 4 connected to the force sensor 6 by the connecting portion 5 is provided vertically inside the main body 3 so as not to contact the wall of the main body 3. Further, a certain gap is provided between the tip of the bellows-like portion 8 of the guide chute 1 and the impact plate 4. The lower end of the main body 3 is connected to the lower transport pipe.

A portion near the tip of the guide chute 1 is an opening 7 for overflowing a powdery material whose both sides are notched and whose mouth is wide open, and a central bottom portion is a bellows-shaped portion 8.

The powder flow meter of the present invention having the above structure operates as follows.

The granular material flows into the guide chute 1 from the upper conveying pipe in the direction of arrow A, slides down the guide chute 1, and collides with the impact plate 4 in the direction of arrow B from the bellows-shaped portion 8.

When the flow rate of the granular material flowing through the bellows-like portion 8 is small, it gathers at the center of the bottom of the bellows-like portion 8 and flows down.
The impact plate 4 collides well. In addition, when the flow rate is medium, a part of the granular material overflows from the bellows-shaped part 8 and falls, but since the granular material falls to some extent and drops, the horizontal velocity does not decrease due to air. Further, when the flow rate is large, the measured value of the powder flow meter becomes inaccurate, but overflows to the side and falls.

The impact plate 4 receives a horizontal component force of the impact load, and transmits this from the connecting portion 5 to the force sensor 6. The horizontal component is converted into an electric signal by the force sensor 6 and is output as a flow rate of the granular material. The granular material then falls and flows into the lower transport pipe in the direction of arrow C.

When the particles generate an irregular flow or a large amount of flow, the particles try to clog in the gap between the tip of the guide plate 1a and the impact plate 4. The portion overflows from the overflow opening 7 and falls into the lower transport pipe. Since the bellows-like portion 8 is thin, the granular material easily falls to the side, and therefore, the flow of the granular material is less likely to stagnate or block. FIG.
FIG. 4 is a perspective view of another embodiment of the guide chute used in the powder flow meter of the present invention. The guide chute 1a is a hollow body having a V-shaped cross section, and the granular material flows intensively in the V-shaped groove to reach an upper open V-shaped projection 8a at the tip. The overflow opening 7 is provided at the tip of the guide chute 1a.
And the upper open V-shaped projection 8 described above is provided at the center bottom thereof.
The formation of a is the same as the embodiment shown in FIGS. The upper open V-shaped projection 8a corresponds to the bellows-shaped portion 8 of the above-described embodiment, and has the same function.

[0020]

[Effect of the present invention] By installing the powder flow meter of the present invention, even if a large amount of powder flows more than expected in the transport pipe, it can be clogged by overflowing appropriately. As a result, there is no need to stop the flow operation of the entire granular material transport device provided with the granular material flow meter.
In addition, by making the shape of the guide chute conical , it is possible to improve the accuracy of the granular material flowmeter and to enhance the overflowing function of the granular material.

[Brief description of the drawings]

FIG. 1 is a sectional view of the powder flow meter of the present invention.

FIG. 2 is a perspective view of a guide chute used in the powder flow meter of the present invention.

FIG. 3 is a perspective view of another embodiment of the guide chute used in the powder flow meter of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Guide chute 3 Main body 4 Impact plate 5 Connecting part 6 Sensor 7 Overflow opening part 8 Bellows-like part

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G01F 1/30 G01G 11/00

Claims (1)

(57) [Scope of request for utility model registration] A powder for measuring a flow rate of a granular material by measuring a horizontal component of an impact load generated when the guide chute having an inclined flow path of the granular material is lowered and hits a vertical impact plate. In the granular material flow meter, the guide chute is used to prevent clogging of the granular material at the tip of the guide chute.
It has a U-shaped bottom surface, and has an opening for overflowing powder and granules near the tip of the guide chute, and a central bottom of the opening for overflow.
A powder flow meter having a bellows-like portion at the tip of the portion .