JP2010229505A - Vacuum valve in vacuum degassing equipment and method for seating valve element for vacuum valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a vacuum valve in a vacuum degassing equipment which surely and stably opens or shuts down an interval between a hopper and a vacuum degassing vessel, without damaging a valve element and a valve seat caused by addition material from the hopper. <P>SOLUTION: A hole opening 11b opened to a valve chest side of a second communicating hole 11 communicated with a vacuum degassing vessel 4, is arranged vertically under a hole opening 10b opened to the valve chest side of a first communicating hole 10 communicated with the hopper, the valve seat 13 is formed into an annular shape surrounding the periphery of the hole opening 10b of the first communicating hole 10 in the valve chest 12. Further, a valve opening/closing mechanism 16 is provided which switches a valve member 14 between a valve closing position allowing the valve seat 13 to be closed by bringing the valve element 15 into close contact with the valve seat 12 in the valve chest 12 against the vacuum pressure of the vacuum degassing vessel 4 from the valve chest 12 side and a valve opening position allowing the valve seat 13 to be opened by moving, in the valve chest 12, the valve element 15 to a position avoiding a position vertically under the hole opening 10b of the first communicating hole 10 and avoiding a position vertical over the hole opening 11b of the second communicating hole 11. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention is interposed between a hopper for introducing an additive such as iron chip, aluminum, manganese, or various alloys into a vacuum degassing tank and the vacuum degassing tank, and the flow and blocking of the additive The present invention also relates to a vacuum valve of a vacuum degassing facility for opening and closing a vacuum degassing tank associated therewith, and a valve body sheet method for the vacuum valve.

RH vacuum degassing equipment is widely known as equipment for degassing metals and alloys in vacuum. In recent years, vacuum degassing equipment is used in this vacuum degassing equipment to adjust the components of molten metal. In many cases, small iron chips and additives such as aluminum, silicon, manganese, and other various alloys are put into the vacuum chamber. These additive materials are accommodated in a plurality of hoppers arranged on the vacuum degassing tank for each type of additive material, and are vacuum degassed by an amount necessary for adjusting the components of the molten metal. Usually, it is dropped into the gas tank.
In this type of vacuum degassing apparatus, a vacuum valve that opens or shuts off between the hopper and the vacuum degassing tank is generally disposed between the hopper and the vacuum degassing tank. When the valve is opened, the additive material from the hopper is circulated and the additive material is put into the vacuum degassing tank. When the valve is closed, the additive material from the hopper is blocked and the vacuum degassing tank is in a vacuum state. To be maintained.

  As the vacuum valve, as shown in FIG. 6A, the frustoconical valve body 40 whose peripheral surface functions as a seat surface is moved up and down, and the valve body 40 is connected to the seat surface 40a of the valve body 40. There is known a configuration in which the valve seat 41 is closed and opened by being brought into and out of contact with a valve seat 41 provided on a suitable downwardly inclined surface. However, in this type of vacuum valve, as shown in FIG. 6B, when the valve seat 41 is opened, the additive 42 that is dropped and introduced from the hopper toward the vacuum degassing tank is When passing through the communication passage 43 with the valve body 40, the seat surface 40a of the valve body 40 collides with or comes into contact with the seat body 40a, so that the seat surface 40a is severely damaged or worn, and the sheet property is remarkably lowered. Therefore, it is necessary to frequently perform maintenance or replacement of the valve body 40.

Further, as shown in FIGS. 7A and 7B, a spherical valve body 45 formed with a through hole 45a penetrating in a direction along the central axis, and a curved valve in which the valve body 45 is accommodated. The chamber 46 and the valve chamber 46 are provided in the vicinity of the hole 47a of the first communication hole 47 connected to the hopper and in the vicinity of the hole 48a of the second communication hole 48 connected to the degassing vacuum tank. And when the valve body 45 is rotated so that the opening of the through hole 45a is positioned in a direction facing the first and second communication holes 47, 48, the valve is opened. There is also a vacuum valve configured to close when the opening of the hole 45a is positioned in the other direction.
However, in this type of vacuum valve, as shown in FIG. 7 (b), when the valve body 45 is rotated, the additive 50 remaining on the valve body 45 is removed between the valve seat 49 and the valve chamber 46. There was a case where it was in a state of being bitten by a gap between them. At that time, not only is the spherical surface serving as the seat surface of the valve body 45 damaged, but also the rotation of the valve body 45 is stopped, so that the operation of the vacuum degassing equipment itself is stopped and the bite added. It is necessary to remove the material 50 and maintain the vacuum valve. Depending on the degree of damage, the vacuum valve itself may need to be replaced.

On the other hand, in the vacuum degassing facility, as shown in Patent Document 1, the pressure difference between the connecting hole connected to the vacuum pressure side and the connecting hole connected to the atmospheric pressure side is used to change from the high pressure side to the low pressure side. In general, various valves are used to bring the valve body into close contact with the valve seat.
However, in a vacuum valve that opens or shuts off between the hopper and the vacuum degassing tank, the valve body is in close contact with the valve seat from the hopper side that is atmospheric pressure toward the vacuum degassing tank valve body side that is vacuum. Since the valve seat is exposed on the hopper side, it is highly possible that the additive material falling from the hopper will collide with or come into contact with the valve seat. Is considered to be significantly reduced. In addition, the possibility of additive material remaining on the valve seat cannot be denied, and if the valve body is brought into close contact with the valve seat in this state and the valve is to be closed, the residual additive material is caught and the seating force is reduced. In some cases, the valve seat may be damaged. Therefore, this type of vacuum valve is not suitable for a configuration in which the valve body is pressed from the high pressure side toward the low pressure side so that the valve seat is exposed to the atmosphere side.

JP 2002-243604 A

  The technical problem of the present invention is that the vacuum degassing equipment vacuum that reliably and stably opens or shuts off between the hopper and the vacuum degassing tank without damaging the valve body and the valve seat by the additive material from the hopper. It is providing the valve and the valve body sheet | seat method.

  In order to solve the above-mentioned problems, a vacuum valve of a vacuum degassing apparatus according to the present invention is a first port that is opened upward at the top of a housing and is connected to a hopper that introduces an additive into a vacuum degassing tank at the tip. A second communication hole having a second port that opens downward in the lower portion of the housing and is connected to the vacuum degassing tank at the tip, and the first communication hole and the second communication hole. A valve chamber provided in the housing, communicating with the first port and the second port through the hole; a valve seat provided in the valve chamber; and a valve member having a valve body for opening and closing the valve seat. When the valve is opened, the additive material from the hopper is circulated and dropped, and the additive material is put into the vacuum degassing tank. When the valve is closed, the additive material from the hopper is blocked and the vacuum degassing tank is kept in a vacuum state. Maintaining vacuum degassing equipment In the empty valve, a hole opening on the valve chamber side of the second communication hole is provided vertically below the hole hole opened on the valve chamber side of the first communication hole, and the valve seat is provided in the valve chamber. The valve member is formed in an annular shape surrounding the hole of the first communication hole, and the valve member closely contacts the valve seat from the valve chamber side against the vacuum pressure of the vacuum degassing tank in the valve chamber. The valve seat is closed by closing the valve seat and moving the valve body to a position avoiding a position vertically below the hole of the first communication hole and a position vertically above the hole of the second communication hole to open the valve seat. It has a valve opening / closing mechanism for switching to a valve opening position.

In the present invention, the valve opening / closing mechanism of the valve member includes an arm member having the valve body attached to a distal end side thereof, and extends in a horizontal direction perpendicular to the axial direction of the arm member. And at least one end in the axial direction is led out of the housing, and is connected to one end of the shaft that is led out of the housing. Driving means for rotating the shaft member, and by rotating the shaft member by the driving means, the arm member is rotated between the valve closing position and the valve opening position with the shaft member as a fulcrum. It can be configured.
In this case, the vacuum valve is provided with the first and second communication holes, the main body provided with the valve seat, the valve member, and the valve body when the valve body is opened. A valve member unit portion formed with a retreat space for retracting the valve body and the arm member from vertically below the hole of the first communication hole and vertically above the hole of the second communication hole, The valve member unit portion is preferably detachably attached to the main body portion.

Furthermore, in the present invention, the valve member may be provided on both sides of the hole hole of the first communication hole and the hole hole of the second communication hole.
Further, in the present invention, the valve body of the valve member has an annular packing that is detachably attached to a position that contacts the valve seat, and the packing has an upper end side that contacts the valve seat, It can be formed in a trapezoidal shape with a narrower width than the lower end side located on the valve body side.

  On the other hand, in order to solve the above problems, the valve body sheet method in the vacuum valve of the vacuum degassing equipment of the present invention is interposed between the hopper for introducing the additive into the vacuum degassing tank and the vacuum degassing tank. When the valve is opened, the additive material from the hopper is circulated and dropped, and the additive material is introduced into the vacuum degassing tank. When the valve is closed, the additive material from the hopper is blocked and the vacuum degassing tank is in a vacuum state. In a vacuum valve of a vacuum degassing facility that maintains the above, a first communication hole having a first port connected to the hopper, a second communication hole having a second port connected to the vacuum degassing tank, and these A valve chamber provided in the housing, communicating with the first port and the second port through the first communication hole and the second communication hole, a valve seat provided in the valve chamber, and opening and closing the valve seat In a vacuum valve with a valve body A body seat method, wherein a hole opening on the valve chamber side of the second communication hole is provided vertically below the hole hole opened on the valve chamber side of the first communication hole, and the valve seat is mounted on the valve It is formed in an annular shape surrounding the hole opening of the first communication hole in the room, and when the additive is introduced, the valve element is separated from the valve seat, and the valve element is formed in the hole of the first communication hole. The valve is opened by moving it to a position that avoids the vertical bottom and the vertical opening of the second communication hole, and the additive material is dropped from the first communication hole toward the second communication hole. When completed, the valve body is closed by pressing and closely contacting the valve seat from the valve chamber side against the vacuum pressure from the vacuum degassing tank.

According to the present invention, the hole opened on the valve chamber side of the second communication hole connected to the vacuum degassing tank is vertically below the hole opened on the valve chamber side of the first communication hole connected to the hopper. Since the valve seat is formed around the opening of the first communication hole in the valve chamber so that the valve seat is not exposed to the hopper side, the additive material from the hopper collides with or contacts the valve seat. This prevents the valve seat from being damaged by the additive. Further, the valve body is closed from the valve chamber side against the vacuum pressure of the vacuum degassing tank to close the valve seat, and the valve body is closed at the opening of the first communication hole. The valve body is damaged by the additive material falling from the hopper because it is configured to switch to the valve opening position where the valve seat is opened by moving to a position that avoids the vertical bottom and the vertical top of the second communication hole. And the seating force on the valve seat is not impaired.
Therefore, when the valve is opened, damage to the valve seat and the valve body due to contact or collision of the additive is reliably prevented, while the vacuum state of the vacuum degassing tank can be reliably maintained when the valve is closed. The space between the hopper and the vacuum degassing tank can be reliably and stably opened or shut off.

It is a front view showing roughly an example of vacuum degassing equipment using a vacuum valve concerning the present invention. It is a partially broken front view of the vacuum valve concerning the present invention. It is a partially broken top view of the vacuum valve which concerns on this invention. It is a principal part expanded sectional view which shows the sheet | seat state to the valve seat of the valve body and packing at the time of valve closing. It is a partially broken front view which shows the state which attached the obstruction board to the main-body part. It is a front view which shows roughly the (a) valve closing state and (b) valve opening state of the conventional vacuum valve. It is a front view which shows schematically the (a) valve closing state and (b) valve opening state of the conventional vacuum valve different from FIG.

  1 to 4 show an embodiment of the vacuum valve of the vacuum degassing equipment of the present invention. The vacuum valve 1 of this embodiment is used in the vacuum degassing equipment 2 as shown in FIG. An example is shown. That is, the vacuum valve 1 is arranged on the upper side of the vacuum degassing equipment 2 and includes a plurality of hoppers 3 each containing various additives and a vacuum degassing tank 4 for performing degassing treatment. The additive material from the hopper 3 is circulated and dropped when the valve is opened, and the additive material is put into the vacuum degassing tank 4. When the valve is closed, the additive material from the hopper 3 is shut off and vacuum degassed. The vacuum state of the gas tank 4 is maintained.

Each of the hoppers 3 is provided with a swivel-type seal valve 3a on the upper side, and a replenishment hole (not shown) for replenishing an additive that communicates with the inside of the hopper opens and closes by horizontally turning the seal valve 3a. It is configured and is opened only when the additive is replenished. In addition, a rotary valve 5 is disposed at the lower end of each hopper 3 to discharge and drop a necessary amount of the additive in the hopper 3 toward the vacuum valve 1, and further on the discharge side of each rotary valve. A pipe-shaped primary chute 6 connected to a first port 10a (to be described later) of the vacuum valve 1 is attached so that the additive material is introduced while dropping into the vacuum valve 1.
On the other hand, a pipe-like secondary chute 7 connected to a later-described second port 11 a of the vacuum valve 1 is attached to the vacuum degassing tank 4 and falls through the vacuum valve 1. An additive is introduced into the degassing tank 4.

The hopper 3 and the secondary chute 7 are connected to each other by a pipe provided with a pressure equalizing valve (not shown) in the middle, separately from the pipe for the vacuum valve 1, and the additive material is introduced. At that time, by opening the pressure equalizing valve with the seal valve 3a closed, the hopper 3 and the primary chute 6 and the vacuum valve 1 are evacuated to the same degree of vacuum as the vacuum degassing tank 4. be able to.
On the other hand, after the addition of the additive is completed and after the vacuum valve is closed, the communication between the hopper 3 and the secondary chute 7 through the pipe can be blocked by closing the pressure equalizing valve. Yes. At this time, the seal valve 3a can be opened to replenish the hopper 3 with additives, and at that time, the hopper 3 and the primary chute 6 are at atmospheric pressure.

The vacuum valve 1 is opened upward at the upper portion of the housing 9 and is opened downward at the first communication hole 10 connected to the hopper 3 via the primary chute 6 and the lower portion of the housing 9. The second communication hole 11 connected to the vacuum degassing tank 4 via the secondary chute 7 and the valve provided in the housing 9 that communicates with the first communication hole 10 and the second communication hole 11. A chamber 12, a valve seat 13 provided in the valve chamber 12, and valve members 14 and 14 having a valve body 15 for opening and closing the valve seat 13 are provided.
In this embodiment, as shown in FIG. 2, the valve members 14 are arranged on the left and right sides in a front view. A door (not shown) for opening the valve chamber of the vacuum valve is attached to the front side of the housing 9 of the vacuum valve so that it can be used for maintenance of the valve chamber. .

The first communication hole 10 is a substantially cylindrical one extending in the vertical direction and having a first port 10a connected to the lower end of the primary chute 6 on the upper end side. The hole opening 10b is open downward on the valve chamber 12 side. Further, the first communication hole 10 is formed so as to gradually taper as it goes downward, and the additive material passing through the first communication hole 10 is less likely to be scattered in the valve chamber 12.
On the other hand, the second communication hole 11 has a cylindrical shape extending in the vertical direction and having a second port 11a connected to the upper end side of the secondary chute 7 on the lower end side. Has a configuration in which a hole 11b opened upward is opened on the valve chamber 12 side. The second communication hole 11 is arranged such that the valve chamber-side hole 11b is positioned vertically below the valve chamber-side hole 10b of the first communication hole 10, and the second port 11a The inner diameter of the hole 11 b on the valve chamber side is formed wider than the inner diameter, and the additive material that has dropped through the first communication hole 10 is smoothly introduced into the second communication hole 11. Yes.

The valve chamber 12 is formed in the internal space of the housing 9 and accommodates a part of the valve member 14 including the valve seat 13 and the valve body 15. The valve chamber 12 has holes 10b and 11b on the valve chamber side of the first communication hole 10 and the second communication hole 11, respectively. The first communication hole 10 and the second communication hole 11 The first port 10a and the second port 11a are communicated with each other.
The valve seat 13 is disposed downward on the upper inner wall surface in the valve chamber 12, and is formed in an annular shape surrounding the hole 10 b on the valve chamber side of the first communication hole 10. The valve seat according to this embodiment is formed by annularly and smoothing the periphery of the hole 10b of the first communication hole 10 in the valve chamber 12, and a later-described packing 20 attached to the valve body 15 is provided. The upper end surface is in close contact so that a high sheet force can be exhibited.

In the valve body 15 and the valve chamber 12, the valve member 14 brings the valve body 15 into close contact with the valve seat 13 from the valve chamber 12 side against the vacuum pressure of the vacuum degassing tank 4. The valve seat 13 is moved to a valve closing position for closing the seat 13, and the valve body 15 is moved to a position avoiding a position vertically below the hole opening 10 a of the first communication hole 10 and a position above the hole opening 11 b of the second communication hole 11. Is provided with a valve opening / closing mechanism 16 that switches the valve opening position to open the valve.
Further, the valve opening / closing mechanism 16 includes an arm member 17 having the valve body 15 attached to the distal end side thereof, and extends in a horizontal direction perpendicular to the axial direction of the arm member 17. The shaft member 18 is attached to the base end side of the arm member 17, and both end sides in the axial direction are led out of the housing. The shaft member 18 is rotatable around the axis, and the shaft member 18 is led to one end side led out of the housing. It has drive means 19 which is connected and rotates the shaft member 18. As shown in FIG. 2, the shaft member 18 is rotated by the driving means 19, and the arm member 17 is moved to the valve closing position and the valve opening position of the valve body 15 with the shaft member 18 as a fulcrum. It is configured to rotate.

The valve body 15 is attached to the tip of the arm member 17 via a shaft rod 15a extending in a direction orthogonal to the axial direction of the arm. 15a can be rotated at a fixed angle in a direction suitable for the direction of the valve seat 13 with the fulcrum 15a as a fulcrum.
The valve body 15 has a substantially circular closed surface 15b in plan view having an outer diameter larger than the outer diameter of the valve seat 13 that closes the hole 10b on the valve body side of the first communication hole 10 when the valve is closed. An annular packing 20 is attached to the closing surface 15b so as to be detachably attached at a position in contact with the valve seat 13.
As shown in FIG. 4, the packing 20 has a trapezoidal cross-sectional shape in which the upper end side contacting the valve seat 13 is narrower in cross section than the lower end side positioned on the valve body side. By fitting into a mounting groove 21 formed on the top, which has a cross-sectional shape that conforms to the cross-sectional shape of the packing 20, that is, a substantially trapezoidal cross-section that is wider than the opening side, the mounting groove 21 comes off. It is fixed to the seat surface in a difficult state.

The arm member 17 is formed in a prismatic rod shape, and rotates the valve chamber 12 in synchronism with the shaft member 18 with the shaft member 18 as a fulcrum, thereby opening the valve body 15 to the closed position. It is possible to switch to the valve position. In this embodiment, as shown in FIG. 2, when the distal end side of the arm member 17 is downward, the valve opening position (position indicated by a broken line), and when the distal end side is substantially horizontal, the valve closing position (practice). It is set to be a position indicated by.
As shown in FIG. 2, the arm member 17 of this embodiment is formed so that the height (thickness) gradually decreases toward the tip side, and as shown in FIG. The end side is formed in a cylindrical shape having a hollow portion into which the shaft member 18 is fitted. Further, a projecting portion 17a for restricting an angle at which the valve body 15 can be rotated is provided integrally with a distal end side of the arm member 17 with respect to the connecting portion of the valve body 15 with the shaft 15a.

The shaft member 18 is a columnar member having a smaller diameter than the height of the arm member 17, and more specifically, an outer diameter adapted to a hollow portion formed on the proximal end side of the arm member 17. The position relative to 17 is fixed so as not to move.
Further, as shown in FIGS. 2 and 3, the shaft member 18 has a part on the base end side to which the driving means 19 is connected and a part on the tip end side which is the other end side outside the valve chamber, that is, The vicinity of the portion led out to the outside of the housing and led to the outside of the housing on the front end side and the base end side is rotatably supported by the rotary bearings 22 and 22, and the lead-out portion to the outside of the housing is The oil seal 23 is hermetically sealed between the inside of the valve body 12 and the outside of the housing. In addition, the shaft member 18 of this embodiment is covered with the cover member 24 at the front end side led out of the housing so as not to be exposed to the outside.

  The driving means 19 has a connecting arm 25 whose front end side is connected to a portion led out of the housing on the base end side of the shaft member 18, and the front end of the piston rod 25 is connected to the base end side of the connecting arm 25. And a fluid pressure cylinder 26. The drive means 19 is configured to drive the fluid pressure cylinder 27 to reciprocate the piston rod 26 so that the connecting arm 25 swings up and down with the shaft member 18 as a fulcrum. By swinging the arm 25, the shaft member 18 and the arm member 17 are integrally rotated, whereby the arm member 17 and the valve body 15 are moved between the valve closing position and the valve opening position. .

The connecting arm 25 is connected to the shaft member 18 so that the distal end side thereof does not move relative to the shaft member 18, and the shaft member 18 is moved within a certain angle range by swinging the connecting arm 25 in the vertical direction. It is designed to rotate integrally. Further, the base end side is connected to the tip end of the piston rod 26 of the fluid pressure cylinder 27 via a shaft rod 28 so as to be mutually rotatable.
Note that the distal end portion of the connecting arm 25 is formed in a cylindrical shape having a hollow portion into which the shaft member 18 is inserted, and the connecting arm 25 is connected to the shaft member 18 at this portion.

On the other hand, the fluid pressure cylinder 27 causes the piston rod 26 attached to the piston to reciprocate in the axial direction by reciprocating the piston inside the cylinder with the compressed fluid, and is attached to the outside of the housing. A cylinder body 27 a is attached to the outside of the housing via a member 29 and a support member 30 described later disposed between the attachment member 29 and the fluid pressure cylinder 27. As shown in the right half of FIG. 2, the fluid pressure cylinder 27 pushes up the connecting arm by moving the piston rod forward (moving upward), while as shown in the left half of FIG. By moving backward (moving downward), the connecting arm is pulled downward, so that the connecting arm can be swung up and down with the shaft member as a fulcrum.
The fluid pressure cylinder 27 is given a driving force sufficient to bring the valve body 15 into close contact with the valve seat 13 against the vacuum pressure of the vacuum degassing tank 4.

  The support member 30 described above can swing the entire fluid pressure cylinder 27 within a certain range around a shaft portion 30a extending in the horizontal direction. Specifically, when the piston rod 26 moves forward, depending on the position of the connecting arm 25, the fluid pressure cylinder in a direction in which the upper side is inclined toward the housing 9 from the position where the axis of the piston rod 26 is substantially vertical. The whole is inclined, and conversely, when the piston rod 26 moves backward, the whole fluid pressure cylinder 27 is swung so as to return to the vertical direction.

Further, in this embodiment, the valve member 14 is arranged on both the left and right sides as described above, and even if one valve member cannot be used due to maintenance or the like, the other valve member Can be driven to maintain the function as a vacuum valve.
These valve members 14 and 14 have the same configuration, and sandwich the hole 10b of the first communication hole 10 and the hole 11b of the second communication hole 11 as shown in FIG. They are provided on both sides, that is, on both the left and right sides in the front view of the vacuum valve 1.

By the way, the vacuum valve of this embodiment is provided with the first and second communication holes 10 and 11, the main body portion 31 provided with the valve seat 13, the valve member 14 set, and the valve body. When the valve 15 is opened, a retreat space 33 is formed for retracting the valve body 15 and the arm member 17 from vertically below the hole 10 b of the first communication hole 10 and vertically above the hole 11 b of the second communication hole 11. The two valve member unit portions 32, 32 are configured to be detachably attached to the main body portion 31 with bolts or the like.
Thus, when performing maintenance or the like on one of the left and right valve members 14, 14, or the driving means 19 connected thereto, the valve member unit 32 to which the valve member or the like is attached. Each can be removed. With such a configuration, there is an advantage that it is not necessary to completely stop the work associated with the degassing process for maintenance of the valve member and the like.

Specifically, the valve member unit 32 includes a concave base portion 34 that forms a part of the housing 9 on the outside and a part of the valve chamber 12 on the outside, and a concave portion in the base portion 34. The retraction space 33 is housed in the retraction space 33, and the connecting portion of the arm member and the shaft member to the arm member is accommodated in the retraction space 33. 27 is attached via an attachment member 29 and a support member 30.
Further, as shown in FIG. 2, the retreat space 33 has a shape such that the valve body 15 and the arm member 17 are completely accommodated in the valve opening position of the valve body 15 without entering the main body side. The valve body 15 and the arm member 17 in an open state are not positioned directly below the first communication hole 10 and directly above the second communication hole 11.
On the other hand, the main body 31 is formed with an opening having the same shape as the opening of the retreat space 33 in the base body at the attachment portion with the valve member unit 32, and the valve member unit 32 is mounted. In this case, the valve chamber 15 in the main body 31 and the valve chamber (that is, the retreat space 33) in the valve member unit 32 are connected in an airtight manner.
Further, as shown in FIG. 5, when the valve member unit 32 is removed from the main body 31, the main body 31 can be attached with a closing plate 35 that closes the opening of the main body 31. It has become. Thereby, only at the time of the operation | work which removes one valve member unit part, if a vacuum degassing equipment is stopped and a removal operation | work is complete | finished, a degassing process operation can be performed continuously.

  When the additive is introduced into the vacuum degassing tank using the vacuum valve 1 of the vacuum degassing equipment having the above-described configuration, the fluid pressure cylinder 27 is driven to move the piston rod 26 forward, and the proximal end of the connecting arm 25 By pushing the side upward, the arm member 17 and the valve body 15 are rotated to a position where the valve seat is opened, that is, to a valve opening position (more specifically, in the avoidance space 32), with the shaft member 18 as a fulcrum. Move and open the valve. Thus, the first port 10a and the second port 11a are communicated with each other through the first and second communication holes 10 and 11 and the valve chamber 12, and the additive material from the hopper 13 is dropped and put into the vacuum degassing tank 4. It will be.

On the other hand, after the addition of the additive is finished, the piston rod 26 of the fluid pressure cylinder 27 is moved backward to pull down the base end side of the connecting arm 25, whereby the arm member 17 and the valve body 15 are moved to the valve seat. 13 is closed with the shaft member 18 as a fulcrum in the closed position, that is, the valve closing position, and the valve body 15 (strictly, the packing 20) is seated closely to the valve seat from the vacuum degassing tank 4 side. Close the valve. Thereby, the communication between the hopper 3 and the vacuum degassing tank 4 is blocked, and the vacuum state of the vacuum degassing tank 4 is maintained.
Further, after the vacuum valve 1 is closed, the seal valve 3a is opened to replenish the hopper 3 with the additive. At that time, the pressure equalizing valve is closed, and the hopper 3 side of the valve body 15 of the vacuum valve 1 is at atmospheric pressure, and the vacuum degassing tank 4 side is in a vacuum state. Even in this case, the valve body 15 is kept in a seated state in close contact with the valve seat against the vacuum pressure.

At this time, the hole 11b opened to the valve chamber side of the second communication hole 11 connected to the vacuum degassing tank 4 is opened to the valve chamber side of the first communication hole 10 connected to the hopper 3. Since the valve seat 13 is disposed around the hole 10b of the first communication hole 10 in the valve chamber, that is, at a portion not exposed to the hopper 3 side, the additive material from the hopper 3 is provided. There is no valve seat, collision, contact, or additive material remaining on the valve seat 13, thereby reliably preventing the valve seat 13 from being damaged by the additive material.
In addition, the valve body 15 closes the valve seat by bringing the valve member 15 into close contact with the valve seat from the valve chamber side against the vacuum pressure of the vacuum degassing tank 4 by the rotation of the arm member 17; By moving the valve body to a position that avoids the vertical bottom of the hole 10b of the first communication hole 10 and the vertical top of the hole 11b of the second communication hole 11, the valve body 13 can be switched to the valve opening position. Therefore, the valve body 15 is not damaged by the additive material falling from the hopper 3, and the seat force on the valve seat 13 is not impaired. Further, even when the additive material remaining on the primary chute 6 falls on the valve body 15 when the valve is closed, the valve body 15 rotates together with the arm member with the shaft member 18 as a fulcrum, Since the additive material is shaken off during the valve opening operation of the valve body 15 and the arm member 17, it is not bitten when the valve body 15 is opened or closed.
Accordingly, when the valve is opened, damage to the valve seat 13 and the valve body 15 due to contact or collision of the additive is reliably prevented, while when the valve is closed, the seat force between the valve body 15 and the valve seat 13 is prevented. Is maintained satisfactorily and the vacuum state of the vacuum degassing tank 4 can be reliably maintained, so that the hopper 3 and the vacuum degassing tank 4 can be reliably opened or shut off.

Although the vacuum valve 1 of the said embodiment is comprised by the main-body part 31 and the two valve member unit parts 32 and 32 which can be attached or detached to this main-body part 31, it is set as such a structure necessarily. There is no need, and a configuration in which these are formed integrally and inseparable is also possible.
In the above embodiment, the two valve members 14 and 14 are sandwiched between the hole 10b on the valve chamber side of the first communication hole 10 and the hole 11b on the valve chamber side of the second communication hole 11. Although provided on both sides, only one valve member may be provided.

  Further, in the above embodiment, the driving means 19 is constituted by the connecting arm 25 and the fluid pressure cylinder 27, but the shaft member is rotated by various means such as a motor. Also good.

  In the above embodiment, the valve opening / closing mechanism 16 of the valve member 14 includes the arm member 17 having the valve body 15 attached to the distal end side, and the shaft member connected to the base end portion of the arm member 17. In addition to this, a plate-shaped valve body is slid horizontally and moved to the hole portion of the first communication hole, and the valve body is vacuum-pressured. The structure which presses against a valve seat against this may be sufficient.

DESCRIPTION OF SYMBOLS 1 Vacuum valve 2 Vacuum degassing equipment 3 Hopper 4 Vacuum degassing tank 9 Housing 10 1st communicating hole 10a Hole on the valve chamber side of the 1st communicating hole 11 2nd communicating hole 11a Hole on the valve chamber side of the 2nd communicating hole Port 12 Valve chamber 13 Valve seat 14 Valve member 15 Valve body 16 Valve opening / closing mechanism 17 Arm member 18 Shaft member 19 Drive means 20 Packing 31 Body portion 32 Valve member unit portion 33 Retreat space

Claims (6)

A first communication hole having a first port connected to a hopper for introducing an additive into a vacuum degassing tank at the top of the housing, and opened downward in the lower portion of the housing; A second communication hole having a second port connected to the vacuum degassing tank at the tip, and the first port and the second port communicated with each other through the first communication hole and the second communication hole. A valve member having a valve chamber, a valve seat provided in the valve chamber, and a valve body that opens and closes the valve seat, and the additive material from the hopper is circulated and dropped when the valve is opened. In the vacuum valve in the vacuum degassing facility that keeps the vacuum state of the vacuum degassing tank while shutting off the flow of the additive material from the hopper when the valve is closed,
A hole opening on the valve chamber side of the second communication hole is provided vertically below the hole opening on the valve chamber side of the first communication hole,
The valve seat is formed in an annular shape surrounding the hole of the first communication hole in the valve chamber,
In the valve chamber, the valve member closes the valve seat by bringing the valve body into close contact with the valve seat from the valve chamber side against the vacuum pressure of the vacuum degassing tank; A vacuum opening / closing mechanism having a valve opening / closing mechanism for switching to a valve opening position where the valve seat is opened by moving to a position avoiding a position vertically below the hole opening of the first communication hole and a position vertically above the hole opening of the second communication hole. Gas equipment vacuum valve.   The valve opening and closing mechanism of the valve member includes an arm member having the valve body attached to a distal end side, and a horizontal direction orthogonal to the axial direction of the arm member, and a proximal end side of the arm member in the valve chamber And at least one end in the axial direction is led out of the housing and is pivotable around the shaft, and is connected to one end of the shaft that is led out of the housing. And a driving means for moving, and by rotating the shaft member by the driving means, the arm member is rotated between the valve closing position and the valve opening position with the shaft member as a fulcrum. The vacuum valve of the vacuum degassing equipment according to claim 1.   The vacuum valve includes a main body portion on which the first and second communication holes and a valve seat are disposed, the valve member, and the valve body and the arm member when the valve body is opened. And a valve member unit portion formed with a retreat space for retreating from vertically below the hole opening of the first communication hole and vertically above the hole opening of the second communication hole. The vacuum valve for vacuum degassing equipment according to claim 2, wherein the vacuum valve is detachably attached to the main body.   The said valve member is each provided in the both sides which pinched | interposed the hole hole of the said 1st communicating hole, and the hole hole of the 2nd communicating hole, The Claim 1 characterized by the above-mentioned. Vacuum valve for vacuum degassing equipment.   The valve body of the valve member has an annular packing that is detachably attached at a position that contacts the valve seat, and the upper end side that contacts the valve seat is the lower end side that is positioned on the valve body side. The vacuum valve of the vacuum degassing equipment according to any one of claims 1 to 4, wherein the vacuum valve is formed in a trapezoidal shape with a narrower cross section. The additive is interposed between the hopper for introducing the additive into the vacuum degassing tank and the vacuum degassing tank. When the valve is opened, the additive from the hopper is circulated and dropped to drop the additive into the vacuum degassing tank. In a vacuum valve of a vacuum degassing facility that shuts off the flow of additive material from the hopper and maintains the vacuum state of the vacuum degassing tank when the valve is closed, a first communication having a first port connected to the hopper A hole, a second communication hole having a second port connected to the vacuum degassing tank, and the first port and the second port communicating with each other through the first communication hole and the second communication hole. A valve body seat method in a vacuum valve comprising a provided valve chamber, a valve seat provided in the valve chamber, and a valve body for opening and closing the valve seat,
A hole opening on the valve chamber side of the second communication hole is provided vertically below the hole hole opened on the valve chamber side of the first communication hole, and the valve seat is provided in the first communication hole in the valve chamber. When the additive is introduced, the valve body is separated from the valve seat, and the valve body is vertically below the second communication hole and the second communication hole. The valve is opened by moving it to a position avoiding the vertical top of the hole, and the additive is dropped from the first communication hole toward the second communication hole. A valve body sheet method in a vacuum valve of a vacuum degassing facility, wherein the body is closed by pressing and closely contacting the valve seat against the vacuum pressure from the vacuum degassing tank from the valve chamber side.

Images