JPH11325271A - Valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce an error between a filling amount and a set amount only by providing a valve body with a first communication hole communicating with a fluid passage in a valve box and with a second communication hole having a smaller sectional area than the first communication hole. SOLUTION: A valve body 2 with a first communication hole 21 communicating with a fluid passage 11 in a valve box 1 is provided with a second communication hole 22 crossing the first communication hole 21 and having a smaller sectional area than the first communication hole 21 to keep a rotation area where the second communication hole 22 is fully open to the fluid passage 11 in the course of the fully opening fluid passage 11 being fully closed via the valve body 2 and then to cause the second communication hole 22 to be fully closed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve for adjusting a flow rate of powder.

[0002]

2. Description of the Related Art For example, a ball valve is used as a valve for adjusting the flow rate of powder. 6 is a vertical cross-sectional view of a valve according to a conventional example, FIG. 7 is a cross-sectional view taken along line XX of FIG. 6, FIG. 8 is a cross-sectional view of a state where the communication hole is half-opened, and FIG. FIG. 10 is an explanatory view showing a process of adjusting the flow rate of the powder.

As shown in FIGS. 6 and 7, the ball valve has a valve box 101 having a fluid passage 100 penetrating from one end to the other end, and a communication hole 1 communicating with the fluid passage 100.
And a substantially ball-shaped valve element 103 rotatably provided in the valve box 101.
3 by rotating the fluid passage 10 in the communication hole 102.
The communication hole 100 is configured to be opened / closed while changing the open area to zero.

[0004]

By the way, the valve is provided in the supply passage of the powder to be filled in the container such as a bottle or at the outlet of the supply passage, and the flow rate of the powder is controlled by the rotation of the valve body 103. When the container is adjusted and filled with a certain amount of powder in the container, there is a problem that an error in the filling amount is large.

For example, powders such as calcium carbonate having a low viscosity, a low flow resistance and a particle size of about 100 to 700 microns are mixed, and the average particle size of the powder in the supply passage is not always constant. The valve is provided near the outlet of the body supply passage, and below the outlet of the supply passage,
A container such as a bottle placed on a balance is arranged, and the valve body 103 of the valve is rotated to fully open the communication hole 102 as shown in FIGS. 6 and 7, and the scale is filled while filling the bottle with powder. When a predetermined amount of powder is filled by measuring according to the formula (1), the valve body 103 is rotated by a half turn before the set filling amount is reached, and the communication hole 1 is filled.
No. 02, the opening area to the fluid passage 100 is reduced, and the communication hole 102 is closed so that the filling amount is set. However, the powder flowing through the supply passage is one kind of powder. Also, particles having a particle size of about 100 microns to about 700 microns are mixed, and the average particle size is not always constant, and the difference in the average particle size causes variation in the fluidity of the powder. Communication hole 10
Even when the time to start closing 2 and the time until it is fully closed are set, a large error occurs in the filling amount.

[0006] The particle size is about 100 microns to 70 microns.
A fluid passage 100 and a communication hole 102 are provided near an outlet of a supply passage for supplying powder such as calcium carbonate of about 0 μm.
Are provided with valves each having an inner diameter of 19 mm (cross-sectional area: 2.8 cm ² )
6040 in a jar with a capacity of 7000 g
g (set amount) when filling the powder, as shown in FIG.
In FIG. 6, FIG. 7 and FIG.
The communication hole 102 is fully opened as shown in FIG.
Before the communication hole 102g, as shown in FIG. 8 and FIG.
Was half-opened, and after filling for 21 seconds in this half-open state, a test was performed in which the fluid passage 100 was fully closed as shown in c of FIG. 9 and FIG. 10, and as a result, ± 45 g (1. 5%).

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and a valve body having a first communication hole communicating with a fluid passage of a valve box is provided with a cross-sectional area of the first communication hole. The first communication hole is fully opened until a predetermined amount is filled with respect to the set amount, and then the second communication hole is fully opened. It is an object of the present invention to provide a valve which can be filled as a liquid and can reduce an error of a charged amount with respect to a set amount.

[0008]

According to a first aspect of the present invention, there is provided a valve for opening / closing the first communication hole by rotating a valve having a first communication hole communicating with a fluid passage provided in a valve box. In such a valve, the valve body is provided with a second communication hole having a cross-sectional area smaller than a cross-sectional area of the first communication hole.

A valve according to a second aspect of the present invention is a valve wherein a valve body having a first communication hole communicating with a fluid passage provided in a valve box is rotated to open / close the first communication hole. A second communication hole having a cross-sectional area smaller than a cross-sectional area of the first communication hole, and a rotation region in which the second communication hole is fully opened while the valve body is fully opening the first communication hole from fully open. It is characterized in that the second communication hole is fully closed after it is secured.

In the first invention and the second invention, the first communication hole and the second communication hole are changed by changing the open area of the first communication hole and the second communication hole to the fluid passage by rotating the valve body. Holes can be opened / closed. Therefore, when filling a container such as a bottle with a set amount of powder, the first communication hole is fully opened until a fixed amount is filled with respect to the set amount, and after the certain amount is filled, the first communication hole is filled. By continuing the filling by closing the second communication hole while closing the communication hole and finally closing the second communication hole, it is possible to reduce the error of the filling amount with respect to the set amount.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the drawings showing the embodiments. 1 is a longitudinal sectional view of the valve of the present invention, FIG. 2 is a sectional view taken along line XX of FIG. 1, and FIG.
FIG. 4 is a cross-sectional view of a state in which the communication hole is fully closed and a second communication hole is fully opened, FIG. 4 is a cross-sectional view of a state in which the first communication hole and the second communication hole are fully closed, and FIG. It is explanatory drawing which shows the process of adjusting.

The valve includes a valve passage 1 having a fluid passage 11 penetrated from one end to the other end and a valve seat 12 in the middle of the fluid passage 11, a first communication hole 21 communicating with the fluid passage 11, and Second communication hole 22 intersecting with first communication hole 21
A substantially ball-shaped valve body 2 rotatably provided in the valve box 1, and an operating body 3 for rotating the valve body 2, and rotating the valve body 2. By doing so, the first communication hole 21 and the second communication hole 22 are opened / closed while the opening area of the first communication hole 21 and the second communication hole 22 to the fluid passage 11 is changed.

The valve body 2 has an inner diameter of the first communication hole 21 of 1
9 mm (cross-sectional area 2.8 cm ² ), and the inner diameter of the second communication hole 22 is about 1/2 of 10 mm (cross-sectional area 0.8 cm) with respect to the first communication hole 21.
² ), the first communication hole 21 and the second communication hole 22 are provided so as to pass through the rotation center of the valve body 2. 35
It is provided at an inclination angle of degrees. The inner diameter of the first communication hole 21 and the second communication hole 22 is appropriately set according to the type of powder, the size of the powder supply passage such as a pipe member, and the like.

On one side of the valve body 2, the axial operating body 3 is provided.
A support shaft 4 is provided on the other side, and the operation body 3 and the support shaft 4 are rotatably supported in the valve box 1 in contact with the valve seat 12.

The operating body 3 is connected to an actuator provided with a solenoid valve, and the rotation of the valve body 2 is automatically controlled by energizing / disconnecting the solenoid valve. You may do so.

The valve constructed as described above has a low viscosity, a low flow resistance, and a flow rate of powder such as calcium carbonate having a particle size of about 100 to 700 microns. It is suitable for filling containers such as bottles.

Specifically, near the outlet of the powder supply passage, the inner diameter of the first communication hole 21 is set to 19 mm (a cross-sectional area of 2.8 c
m ² ), and the inner diameter of the second communication hole 22 is 10 mm (cross-sectional area of 0.1 mm).
8 cm ² ), and a bottle with a capacity of 7000 g placed on a balance is placed below the outlet of the supply passage. Then, the solenoid valve is operated based on the measurement signal measured by the scale, and the valve body 2 is actuated by the actuator.
Is rotated to control the flow rate of the powder, and the bottle is filled with 6020 g (set amount) of the powder. Table 1 shows the particle size distribution of this powder.

[0018]

[Table 1]

When filling the bottle, the filling amount is set to a predetermined amount of 80.
The first communication hole 21 is filled with the first communication hole 21 fully open as shown in FIG. 1 and FIG.
800 g before the set amount, a close command to rotate the valve body 2 is output as shown in FIG. 5, the valve body 2 rotates, and the first communication hole 21 is closed as shown in FIGS. 3 and 5D. The second communication hole 22 is fully opened while the flow rate of the powder is reduced, filling is continued from the second communication hole 22, and a close command to rotate the valve body 2 is output immediately before the set amount reaches 6020 g. The valve body 2 rotates and closes the second communication hole 22 as shown in FIG. 4 and FIG.

When the above filling was tested, the results shown in Table 2 were obtained.

[0021]

[Table 2]

In Table 2, in each test, the first communication hole 2
The reason why the opening times of the first and second communication holes 22 are different is that even with one type of powder, the particle size is from 100 μm or less to 700 μm.
It is considered that powders having a particle size of microns or more are mixed and the average particle size of the powder in the supply passage is not always constant, and the difference in the average particle size causes variation in the fluidity of the powder. In this way, the error of the filling amount in the bottle can be reduced to a small error of ± 5 g (0.1%) with respect to the set amount of 6020 g without being affected by the variation of the average particle size of the powder flowing in the supply passage. We were able to.

[0023]

According to the first and second aspects of the present invention, the valve body provided with the first communication hole communicating with the fluid passage of the valve box has a cross-sectional area smaller than the cross-sectional area of the first communication hole. This is a simple configuration in which only the second communication hole is provided, and the first communication hole and the second communication hole are changed while rotating the valve body to change the open areas of the first communication hole and the second communication hole to the fluid passage. Since the communication hole can be opened / closed, when filling a container such as a bottle with a set amount of powder, the first communication hole is fully opened until a certain amount is filled with respect to the set amount, After the amount is filled, the second communication hole is fully opened while closing the first communication hole, filling is continued in the fully opened state, and finally the second communication hole is fully closed. The error of the filling amount can be reduced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a valve according to the present invention.

FIG. 2 is a sectional view taken along line XX of FIG.

FIG. 3 is a view showing a state in which the first communication hole of the valve according to the present invention is fully closed,
It is sectional drawing in the state where the communication hole was fully opened.

FIG. 4 is a cross-sectional view of the valve of the present invention in a state where first and second communication holes are fully closed.

FIG. 5 is an explanatory view showing a process of adjusting the flow rate of powder of the valve according to the present invention.

FIG. 6 is a longitudinal sectional view of a valve according to a conventional example.

FIG. 7 is a sectional view taken along line XX of FIG. 6;

FIG. 8 is a cross-sectional view of a conventional example in which a communication hole of a valve is half-opened.

FIG. 9 is a cross-sectional view showing a state in which a communication hole of a valve according to a conventional example is fully closed.

FIG. 10 is an explanatory diagram showing a process of adjusting a flow rate of powder of a valve according to a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Valve box 11 Fluid passage 2 Valve body 21 1st communication hole 22 2nd communication hole

Claims (2)

[Claims] 1. A valve in which a valve body having a first communication hole communicating with a fluid passage provided in a valve box is rotated to open / close the first communication hole. First
A valve provided with a second communication hole having a cross-sectional area smaller than a cross-sectional area of the communication hole. 2. A valve in which a valve having a first communication hole communicating with a fluid passage provided in a valve box is rotated to open / close the first communication hole. First
A second communication hole having a smaller cross-sectional area than a cross-sectional area of the communication hole is provided, and a rotation range in which the second communication hole is fully opened is secured while the valve body is fully closing the first communication hole from the fully opened state. And a valve configured to completely close the second communication hole.