JPS5815398B2 - Powder supply valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a powder supply valve, and more specifically,
The present invention relates to a powder supply valve suitable for use in a fluid transport device containing powder and granules.

The explanation will be given below based on the drawings.

FIG. 1 shows an outline of a conventional powder transport device. In the figure, powder 1 is filled in a storage tank 2 and is under low pressure.

An upper valve 3 is provided at the end of the storage tank 2, and a valve body 4 constituting the upper valve 3 is connected to a link mechanism 6 that can swing freely around a fulcrum 5, and is controlled to open and close. .

Further, the powder 1 discharged by opening and closing the valve body 4 is moved to a temporary storage tank 7 and stored therein.

A lower valve 8 is provided at the end of the temporary storage tank 7, and a valve body 9 constituting the lower valve 8 is connected to a link mechanism 11 that can swing freely around a fulcrum 10, and is controlled to open and close. Ru.

The granular material 1 discharged by opening and closing the valve body 9 is configured to fall to the high pressure side 12 of a transportation pipe 11 provided with a pressure gradient.

Therefore, in order to supply the powder 1 filled in the storage tank 2 to the transportation pipe 11 under high pressure, first, the lower valve 8
After closing, the upper valve 3 is opened, and the powder 1 in the temporary storage tank T is lowered to the high-pressure side 12 of the transport pipe 11, and is then pumped through the transport pipe.

In the powder transport device described above, the valve 3
, 8 bits the powder 1 when the valve is closed, and the powder 1 mixes with the air flow on the high pressure side 12 due to a minute gap between the valve body and the valve seat that constitute the valve, and flows. This phenomenon causes the valve body 4° 10 of the valve to change in FIG. 2 (shown for valve 8, but the same applies to valve 3).

) As shown in Fig. 1, wear 20 occurs after operation of the powder transport device.
This has the disadvantage that the airtightness of the valve cannot be maintained, resulting in a decrease in the amount of powder and granular material supplied.

Furthermore, in order to maintain the airtightness of the valve, each time a worn valve body of the valve is replaced, the entire apparatus must be stopped, which has the disadvantage that smooth operation of the apparatus cannot be achieved.

SUMMARY OF THE INVENTION An object of the present invention is to provide a powder supply valve which eliminates the drawbacks of the prior art described above and which prevents wear of the valve body due to airflow fluid containing powder and granules.

A feature of the present invention is that in a valve for controlling the supply amount of a fluid containing powder, a hollow cylindrical valve seat that contacts a valve element constituting the valve has a concentric ring formed on the contact surface with the valve element. By providing a recessed portion and a plurality of holes penetrating the recessed portion and the inner circumferential wall of the valve seat in the circumferential direction of the recessed portion, wear of the valve body of the valve due to airflow fluid containing powder particles can be prevented. The goal is to prevent

Embodiments of the present invention will be described below with reference to FIGS. 3 and 4.

FIG. 3 is a partially cutaway sectional view of the powder supply valve 30 according to the present invention, and FIG. 4 is a side view thereof.

In these figures, a recess 15 is formed concentrically on the valve seat 13 on the contact surface with the valve body 9, and the recess 15
A plurality of holes 16 are provided in the circumferential direction of the valve seat 13, passing through the recess 15 and the inner circumferential wall 17 of the valve seat 13.

The opening and closing of the valve body 9 is controlled by the rocking movement of the link mechanism 11 connected to the valve body 9. When the valve 30 is closed, the valve body 9 and the valve seat 13 are brought into contact and in close contact with each other on the powder supply side (low pressure side) 14 and the discharge side 12 (high pressure side).

In this embodiment, the valve seat 13 is integrally processed from a metal material.

In the powder supply valve according to this embodiment, even if the powder caught between the valve body 9 and the valve seat 13 when the valve is closed is moved by the air flow due to the high pressure on the high pressure side 12, These powder particles are accumulated in the recess 15 and the low pressure side 14
There is no movement of powder at the contact portion 18 between the valve seat 13 and the valve body 9, and hence no wear of the valve body 9 occurs.

Furthermore, when the powder accumulated in the recess 15 exceeds the volume of the recess 15, the powder is sent to the low pressure side (supply side) 14 through the pores 16 while acting as a resistor. Ru.

As a result of configuring the valve seat 13 as described above, according to this embodiment, there is no abrasion light due to the granular material of the valve body, and furthermore, since the granular material itself becomes a resistor, the high pressure side 12 and the low pressure side 14 are connected to each other. The airtightness between the valves is sufficiently maintained, and the wear resistance and airtightness are significantly improved compared to conventional valves of this type.

In the above embodiment, the structure of the valve seat is formed by integrally processing a metal material, etc., but as shown in other embodiments shown in Figs. 5 to 7, a part of the valve seat is replaced. The same effect can be obtained even if it is attached as possible.

That is, in the embodiment of FIG. 5, the valve body (not shown) of the valve seat 13
A ring body 18 is provided with a step 13a concentrically on the inner circumferential wall side in the axial direction of the valve seat 13 from the abutting surface thereof, has an inner diameter that can be inserted into the step 13a, and has a plurality of notches 18a. (FIG. 6) is attached via a spacer 19 by fastening means such as a bolt 22.

In still another embodiment shown in FIG. 7, a stepped portion 13b is provided in the axial direction of the valve seat 13 from the contact surface with the valve body (not shown) to the outer circumferential wall side of the valve seat 13 in the axial direction. Valve seat 13 in part 13b
A plurality of holes 13c are bored in the circumferential direction of the front step portion 13b, and a ring body 24 is attached to the outermost side of the front step portion 13b using fastening means such as bolts 22.

In this embodiment, the spacer 19 used in the embodiment shown in FIGS. 5 and 6 is not required.

As mentioned above, according to the embodiment shown in FIGS. 5 to 7, in addition to the effects obtained in the embodiment shown in FIGS. Therefore, there is no need to replace the entire valve seat, which has the effect of shortening the operation stop time of the powder transport device when the valve is repaired.

As described above, according to the present invention, it is possible to obtain a valve for supplying powder and granular material, which aims to prevent wear of the valve body caused by airflow fluid containing powder and granular material.

Furthermore, as a secondary effect of preventing wear of the valve body, stable operation of the powder transport device for a long period of time becomes possible.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing an overview of a powder transport device, FIG. 2 is an explanatory diagram showing the wear status of a conventional powder supply valve, and FIGS. 3 and 4 are powder and granule according to the present invention. An embodiment of the body supply valve is shown, FIG. 3 is a partially cutaway sectional view, and FIG.
The side views of the valve seat in the figure and FIGS. 5 to 7 are views showing other embodiments of the present invention. 1... Powder, 2... Storage tank, 3, 8, 30...
Valve, 4, 9... Valve body, 7... Temporary storage tank, 11
...Transportation piping, 12...High pressure side, 13...Valve seat, 14...Low pressure side, 15...Recess, 16...Gap, 18, 24...Ring body, 19 ···Spacer.

Claims (1)

[Claims] 1. A valve that controls the supply amount of the fluid of a fluid transport device containing powder and granules, which includes a valve element that controls opening and closing of a passage between a supply side and a discharge side of the fluid by a driving means, and a valve element that comes into contact with the valve element. A hollow cylindrical valve seat is provided, and a recess is provided concentrically on the contact surface of the valve seat with the valve body, and the recess and the inner peripheral wall of the valve seat are penetrated in the circumferential direction of the recess. A valve for supplying powder or granular material, characterized by having a plurality of pores.