JP3382147B2 - Switching valve for molten metal - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switching valve suitable for switching or opening / closing a flow path for transferring high temperature molten metal.

[0002]

2. Description of the Related Art Molten metal (metal bath) melted in a melting furnace
The operation of transferring and pouring the molten metal in the melting furnace is carried out by pumping the molten metal in the melting furnace with a mechanical pump or the like to circulate it in the circulation passage and appropriately switching it from the circulation passage to the branch passage with the switching valve. There is. This switching valve has a problem that since the molten metal is at a high temperature, it is liable to malfunction and requires time-consuming maintenance, and the movable member and the flow path are fixed by the solidified metal after the operation is stopped.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to make maintenance easy even if the fluid flowing through the flow path is a high temperature molten metal, and to prevent the movable member from solidifying after the operation is stopped. The purpose of the present invention is to provide a switching valve for molten metal that can reliably prevent sticking.

[0004]

A molten metal switching valve according to the present invention comprises a recess having an annular conical surface, and a valve body made of a heat-resistant material having an inflow hole and an outflow hole opened in the conical surface, A conical sliding surface that slides in pressure contact with the conical surface, and a valve hole that opens to the sliding surface and connects the inflow hole and the outflow hole at a specific rotation position is provided; It is composed of a rotary valve made of a heat-resistant material which is fitted in the recess and rotates, and a biasing means for biasing the rotary valve or the valve body to press the sliding surface against the conical surface.

[0005]

According to the present invention, since the rotary valve is formed by the conical surface and the abrasion of the sliding surface is compensated by the biasing means, maintenance-free for a long time becomes possible. Further, since the valve body and the rotary valve can be easily separated, it is possible to easily prevent the movable portion from being fixed. Furthermore, it is possible to prevent molten metal from entering the sliding surface due to surface tension.

With the structure according to the second aspect, it is possible to apply an appropriate surface pressure to the sliding surface, and it is easy to rotate and separate. In the structure according to claim 3, the biasing means is inexpensive and has excellent durability. The configuration according to claim 4 is suitable for transferring aluminum hot water.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described based on the embodiments shown in FIGS. The figure shows a switching valve 1 mounted on a circulation channel A for sequentially transferring molten aluminum hot water which is a high temperature liquid from a pool of a melting furnace to a mold. This switching valve 1
Each includes a valve body 2 formed by cutting a carbon material, a rotary valve 3, and a biasing means 4 for the rotary valve 3.

In this embodiment, the switching valve 1 surrounds the entire circumference of the valve body 2 except for the upper side with a heat insulating material 11, and the heat insulating material 1
The outer circumference of 1 is enclosed in a metal outer can 12. The circulation channel A is also surrounded by the heat insulating material 13 and the outer circumference of the heat insulating material 13 by the sleeve 14.

The valve body 2 is provided with a conical recess 21 into which the lower portion of the rotary valve 3 is rotatably fitted, and an inflow hole 22 and an outflow hole which communicate the recess 21 with the outer periphery. Two
3, 24 are provided. Inflow hole 22 and outflow hole 2
All of the holes 3 and 24 have openings 26, 27 and 28 that are open to the conical surface 25 of the recess 21.

The rotary valve 3 comprises a conical lower part 31 fitted in the recess 21 and a cylindrical upper part 33 to which a shaft 32 is connected. The outer peripheral surface of the lower portion 31 has the recess 21.
The sliding surface 34 has the same conical shape as the conical surface 25 of FIG. Inside the rotary valve 3, the sliding surface 34 has the opening 26,
A valve hole 37 having openings 35, 36 is provided for selectively communicating the openings 26, 28 or 26, 27 of the openings 27, 28.

The openings 35 and 36 of the valve hole 37 are aligned with the opening 36 and the opening 27 when the rotation valve 3 is rotated and the opening 35 and the opening 26 are aligned with each other. When the rotary valve 3 is further rotated and the opening 36 and the opening 28 coincide with each other, the opening 3
5 and the opening 26 are set to coincide with each other. The valve hole 37 may be a groove provided on the sliding surface 34.

The recess 21 may be a truncated cone or any other structure as long as it has an annular conical surface, and the lower portion 31 of the rotary valve 3 also slidably contacts the annular conical surface of the recess 21. A truncated cone or other structure may be used as long as it has an annular sliding surface. Further, although the inflow hole 22, the outflow holes 23 and 24, or the valve hole 37 is formed in a polygonal line shape having a circular cross section in this embodiment, it may be formed in a straight line shape in a cross section other than a circle.

The urging means 4 is provided on the upper surface of the outer can 12 with the foot bar 1.
A support plate 16 as a fixing member fixed using 5.
It comprises a spring 41 interposed between the shaft 32 and the shaft 32. A gear 38 is attached to the tip of the shaft 32, and is driven by a turning device (not shown). As a biasing means, a coil spring is the most advantageous from the viewpoint of spring load characteristics, ease of maintenance and cost, but other springs such as a spring, spiral spring, leaf spring, or pressure such as air pressure or hydraulic pressure. A mechanism can be adopted.

In this embodiment, the valve body 2 and the rotary valve 3 are formed by cutting a carbon material as a heat resistant material. The carbon material ensures the heat resistance and durability because the aluminum hot water is transferred at 700 ° C. or lower, repels the aluminum hot water (low wettability), and is difficult to chemically react with the aluminum hot water.
It has the advantage of being relatively inexpensive and easy to process. Further, ceramics such as silicon nitride, silicon carbide, and alumina are suitable for transferring molten metal at a higher temperature, and when the transfer liquid is a high-temperature liquid other than molten metal and has low corrosiveness, heat-resistant corrosion resistance such as nickel alloy is used. Metals can also be used.

In this embodiment, it is practical to set the apex angle (taper angle) α of the truncated cone of the conical surface 25 and the sliding surface 34 to 30 ° to 60 °, and set to 45 ° ± 5 °. This is advantageous from the viewpoint of durability of the sliding surface, liquid tightness, driveability of the rotary valve, and the like. When the molten metal is aluminum hot water, the distance between the sliding surface 34 and the conical surface 25 is 0.2 m.
Even if there is a gap around m, the liquid tightness of the sliding surface can be maintained by the surface tension.

The operation of the switching valve 1 will be described with reference to FIG. The inflow hole 22 and the outflow hole 23 are connected to the circulation flow path A in which the aluminum hot water is circulated, and the outflow hole 24 is connected to the branch flow path 51 to the mold. As shown in (a), the inflow hole 2
When the 2 and the outflow hole 23 communicate with each other through the valve hole 37, the aluminum hot water circulates in the circulation passage A. When supplying aluminum hot water to the mold, the turning mechanism
The rotation valve 3 is rotated to connect the inflow hole 22 and the outflow hole 24 as shown in (b).

In the above embodiment, the valve body 2 has two outflow holes 2
Although a three-way switching valve having 3, 24 is shown, it is obvious that it is also applicable to a switching valve having only one inflow hole and one outflow hole, or a switching valve having four or more holes.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a switching valve.

FIG. 2 is an assembly diagram of a switching valve.

FIG. 3 is an operation explanatory view of a switching valve.

[Explanation of symbols]

1 switching valve 2 valve body 3 Rotation valve 4 urging means 16 Support plate (fixing member) 21 recess 22 Inflow hole 23 Outflow hole 24 Outflow hole 25 conical surface 34 Sliding surface 37 valve hole 41 spring (coil spring)

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-1-107952 (JP, A) JP-A-3-52759 (JP, A) JP-A-2-293591 (JP, A) JP-A-3- 102192 (JP, A) JP-A-58-44959 (JP, A) Actually developed 63-170053 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) F27D 3/14 B22D 35 / 00

Claims (4)

(57) [Claims] 1. A valve body made of a heat-resistant material, which has a recess having an annular conical surface, and an inflow hole and an outflow hole opening in the conical surface, and a conical sliding member which is pressed against the conical surface to slide. Have a moving surface,
A valve hole is provided which opens in the sliding surface and connects the inflow hole and the outflow hole at a specific rotation position,
A rotation valve made of a heat-resistant material that is fitted into the recess and rotates,
A switching valve for molten metal, comprising: a biasing means that biases the rotary valve or the valve body to press the sliding surface against the conical surface. 2. The molten metal switching valve according to claim 1, wherein the conical surface and the sliding surface are conical surfaces having an apex angle of 30 degrees or more and 60 degrees or less. Switching valve. 3. The molten metal switching valve according to claim 1, wherein the urging means is a coil spring interposed between the rotary valve and a fixed member. Switching valve for molten metal. 4. The molten metal switching valve according to claim 1, wherein the valve body and the rotary valve are made of carbon, and the molten metal is molten aluminum. Switching valve for molten metal.