JP2001159469A - Rotary valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary valve having rotor removing and assembling work simplified by a simplified structure and capable of extremely easily adjusting a clearance between the outside diameter of the rotor to be mounted in a valve chamber of a casing and the valve chamber inner wall. SOLUTION: Since a rotor 32 is formed into a tapered shape and an opening part for inserting and drawing the rotor 32 in relation to a valve chamber 31a is formed on the opposite driving side surface of a casing 31, removing and assembling work for the rotor 32 is simplified. A clearance between the outer diameter of the rotor 32 and the inner wall of the valve chamber 31a can be adjusted easily by only a simple work for interposing a detachable adjusting ring 43 having the prescribed thickness between a stepped part 46 of a boss 44 and a stepped part 42 of a drive shaft 40.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary valve using a tapered rotor, and more particularly, to adjusting a gap between an outer diameter of a rotor provided in a valve chamber of a casing and a wall of the valve chamber. The present invention relates to a rotary valve that can be used.

[0002]

2. Description of the Related Art FIG. 2 shows that a conventional rotary valve using a tapered rotor is initially set by wear of a blade tip and thermal expansion by arbitrarily adjusting a gap between the rotor and a casing. It is well known as a valve that can be easily adjusted by moving the rotor in the axial direction even when the gap cannot be maintained.

As one example, there are known a rotary valve having a drive shaft movable together with a tapered rotor within an adjustable range of a gap, and a rotary valve disclosed in Japanese Utility Model Laid-Open Publication No. 61-75437.

In the former rotary valve, an adjusting screw disposed outside the casing presses the shaft end of the drive shaft in the axial direction, and moves the drive shaft to adjust a gap between the rotor and the casing. Is configured.

The latter rotary valve is shown in FIG.
As shown in (b), a plurality of axial seal plates 16 are movably inserted into axial grooves 11 formed in each partition wall 5A of the rotor 5 supported by the rotating shaft 4, and the seal plates 16 are The urging force of the spring 18 makes contact with the liner 9 of the casing 3.

Annular grooves 1 formed at both ends of rotor 5
3, and a pair of circumferential seal plates 21 are inserted into cutouts 17 formed at both ends of each axial seal plate 16 and abut against the liner 9.

Each circumferential seal plate 21 is divided at appropriate intervals in the circumferential direction, and these circumferential seal plates 21 are configured to be freely expandable in diameter.

In the rotary valve thus configured, the partition wall 5A and the sealing plates 16, 1
The powdery material that has entered the space 7 is conveyed in the rotation direction of the rotor 5 and discharged from the discharge port 2.

In transporting the powdery and granular materials, the sealing plates 16 and 21
Is always in contact with the liner 9 by the spring 18, so that there is no leakage from between the seal plates 16, 21 and the liner 9, and even if the seal plates 16, 21 are worn, , 21 are configured to be freely expandable, so that the seal plates 16, 21 are formed in the grooves 11, 17 by the wear amount.
And can come into contact with the liner.

[0010]

However, in the former rotary valve, since the drive shaft is fixed integrally with the rotor, when the rotary valve is taken out to measure the amount of wear of the rotor, the side valves on both sides of the casing are required. Since the work to remove the cover becomes large and the drive shaft is configured to be able to move the bearing in the axial direction, play is likely to occur in the support structure of the bearing, and to position and fix the drive shaft that has been moved and adjusted. In addition to the above-mentioned device, there is a problem that the structure becomes complicated in order to obtain a reliable seal structure around the drive shaft.

In the latter case, the seal plates 16, 21
However, there is a problem that the wear of the seal plates 16 and 21 is promoted with the rotation of the rotor 5 because the spring 18 is configured to always contact the liner 9, and the seal plates 16 and 21 are provided. As a result, the internal structure of the rotor and the casing becomes complicated.

The present invention has been made in view of such a problem, and has a simplified structure, so that the operation of taking out and assembling the rotor is simplified, and the rotor mounted inside the valve chamber of the casing is provided. An object of the present invention is to provide a rotary valve capable of extremely easily adjusting a gap between an outer diameter and a valve chamber inner wall.

[0013]

Means for Solving the Problems The gist of the present invention for attaining the above object is as follows. 1. A powdery or granular material supplied from an upper conveying port is placed in a valve chamber of a casing having a conveying port opened up and down. A rotor for partitioning by a predetermined amount and discharging from a lower transfer port is rotatably provided, and the valve chamber is formed in a tapered shape in which the driving side is tapered, and the driving side surface of the casing is closed with a first side cover. The first outside of the first side cover
A second side cover for arranging a bearing portion, forming the rotor in a tapered shape, opening an opening for allowing the rotor to enter and exit the valve chamber on a side opposite to the drive side of the casing, and opening and closing the opening; Wherein the first bearing portion rotatably supports a drive shaft, one end of which extends outward, and the other of which extends through a rotor in the valve chamber to form a casing. The second side cover is provided so as to protrude to the non-drive side, and has a second bearing portion for supporting the non-drive side of the drive shaft on the second side cover, and the second bearing portion is provided at a shaft end of the drive shaft. A sleeve is externally fitted, one end of the sleeve is in contact with the end of the rotor, and a bearing is inserted into the outer periphery and the end of the sleeve, and a pressure contact member is provided to be in contact with the outer surface of the end bearing. Press the pressing member from outside the second side cover The rotor is formed to be slightly shorter than the length of the valve chamber, is insertable from the non-drive side of the drive shaft, and is provided on a part of the drive shaft. A shaft having positioning means for restraining movement toward the drive side by contact with the contact portion; a disk-shaped side wall provided at both ends of the shaft; An adjusting member having a predetermined thickness is provided between the positioning means and the abutting portion of the driving shaft, the adjusting member having a predetermined thickness which is detachable from the non-driving side of the driving shaft. A rotary valve, which is interposed.

2. The positioning means forms a stepped portion in a through hole formed in the shaft portion, and forms a hole on the driving side of the stepped portion with a large diameter through which the adjusting member can be inserted. The drive side hole is formed with a small diameter, the stepped portion is formed with a through-square hole orthogonal to the axis, and the contact portion of the drive shaft is formed as a stepped portion with a small diameter on the opposite side to the drive side. The rotary valve according to claim 1.

[0015] The adjusting member is an adjusting ring having a through hole through which the small-diameter drive shaft can be inserted, and having a predetermined thickness, the outer diameter of which is smaller than that of the large-diameter drive shaft. The rotary valve according to claim 1, wherein the rotary valve is provided.

4. The driving shaft according to claim 1, wherein a contact portion of the driving shaft is formed in a tapered shape in which an opposite side is tapered, and a stepped portion is formed in the tapered end. In the rotary valve.

[0017]

In the rotary valve according to the present invention, the rotor is formed in a tapered shape, and an opening is provided on the side opposite to the drive side of the casing to allow the rotor to enter and leave the valve chamber. The operation is simplified, and a simple operation of simply interposing a removable adjusting member having a predetermined thickness between the positioning means and the abutting portion of the drive shaft is performed, and the gap between the outer diameter of the rotor and the inner wall of the valve chamber is reduced. Can be easily adjusted.

Further, in the rotary valve of the present invention, by inserting an adjusting member having a predetermined thickness corresponding to the amount of wear from the opposite end of the driving shaft on the non-driving side, the rotor is brought into contact with the stepped portion. Is inserted into the drive shaft, an appropriate gap is necessarily formed between the outer diameter of the rotor and the inner wall of the valve when the stepped portion formed in the through hole comes into contact with the adjustment member.

Further, in the rotary valve of the present invention, the adjustment ring in which the predetermined thickness corresponding to the gap is displayed can be easily and selectively used, and the efficiency of the adjustment ring replacement work can be improved.

In addition, in the rotary valve according to the present invention, since the contact portion of the drive shaft is formed in a tapered shape in which the non-drive side is tapered, when the rotor is inserted into the drive shaft,
Even if the end of the rotor comes into contact with the outer periphery of the drive shaft, the tapered surface serves as a guide surface and can be inserted smoothly.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of a rotary valve showing an embodiment of the present invention, and FIG. 2 is a plan view of the rotary valve.

As shown in FIG. 1, the rotary valve 30
Is a method in which a granular material (for example, incineration ash) supplied into a valve chamber 31a of a cylindrical casing 31 is partitioned and discharged by a predetermined amount by a blade 33 of a rotor 32 rotatably supported in the valve chamber 31a. It is a device for.

In the rotary valve 30 of the present embodiment, the inner wall of the valve chamber 31a in the casing 31 is formed in a tapered shape in which the driving side described later is tapered, and the inner wall of the rotor 32 rotatably mounted in the valve chamber 31a is formed. The outer periphery is also formed in a taper shape that matches the taper of the valve chamber 31a.

The casing 31 has an upper conveying port 34 for receiving the supplied granular material and a lower conveying port 35 for discharging the granular material by a predetermined amount so as to communicate vertically with the valve chamber 31a. Has been established.

An opening 36 for opening and closing the rotor 32 into and out of the valve chamber 31a is provided on one side of the casing 31, and a driving side surface on the other side is closed by a first side cover 37. Have been.

The first side cover 37 is formed integrally with a cylindrical housing 39 projecting outward.
First bearing portions 39a, 39b are provided inside the housing 39.
Is disposed on the first bearing portions 39a and 39b.
The drive-side end portion 0 is rotatable and axially restrained, and is axially supported. The other end is axially supported by a second bearing portion 55 described later.

A sealing member D is provided between the valve chamber 31a side of the first side cover 37 and the first bearing portions 39a and 39b.
Is mounted, and the outer periphery of the drive shaft 40 is hermetically sealed.

The drive shaft 40 has one end 40 facing the drive side surface.
c faces outward from an end of the housing 39, and a stepped portion 40 a for regulating movement in the axial direction is formed between the large-diameter shaft 44 and the first bearing portions 39 a and 39 b at an intermediate portion. A keyway 41 for mounting the rotor 32 is formed in the large-diameter shaft 44.

Further, the drive shaft 40 has a stepped portion 42 serving as a contact portion for positioning between the opposite end of the large-diameter shaft 40a and the small-diameter shaft 40b. A tapered portion is formed such that the opposite side is tapered.

Next, the rotor 32 includes a boss 44 which is a cylindrical shaft fitted into the drive shaft 40, and large and small disk-shaped side walls W1 and W2 provided at both ends of the boss 44; A plurality of blades 33 are provided on the outer periphery of the boss 44 between the side walls W1 and W2, and are formed in a tapered shape tapering toward the driving side.

The boss 44 of the rotor 32 is formed with a through-hole 45 perpendicular to the axis in the middle of the boss 44 in the axial direction, and one surface of the through-hole 45 is formed as a stepped portion 46 serving as positioning means. , The hole on the drive side of the stepped portion,
An adjusting ring 43 as an adjusting member to be described later is formed as a large-diameter hole 44a through which the adjusting ring 43 can be inserted, and a small-diameter hole 44b is formed on the non-drive side.

As the adjusting ring 43, various adjusting rings formed to have a predetermined thickness corresponding to the gap between the outer diameter of the rotor 32 and the inner wall of the valve chamber 31a are prepared. The thickness is displayed.

Stepped portion 4 at end of tapered portion of drive shaft 40
2, an adjusting ring 43 having an outer diameter smaller than the diameter of the large-diameter hole 44 a of the boss 44 is fitted in the small-diameter shaft 40 b on the non-drive side in an abutting state. The other end contacts the stepped portion 46 of the through-hole 45 formed in the boss 44, and positions the rotor 32 in the axial direction (drive side) by pressing a tightening bolt 52 described later.

On the other hand, the opening 36 of the casing 31 is openably and closably closed by a second side cover 47 in which a housing 47a projecting from the center is integrally formed.
A plurality of eyebolts 54 are mounted on the peripheral edge of the side cover 47, and a second bearing portion 55 that supports the other end of the drive shaft 40 is provided inside the housing 47a.

At the other end of the drive shaft 40, a cap-shaped sleeve 48 whose end is closed is inserted into the other end of the boss 44 of the rotor 32 via a sheet packing S.
8 has a bearing 53 composed of a ball bearing or the like.
The bearing 53 is supported inside the housing 47a by the
The casing 31 is hermetically sealed by a seal member D.

A lid 50 is attached to the end of the housing 47a. A bearing 49 such as a ball bearing is supported inside the lid 50, and the bearing 49 is externally fitted to the other end of the drive shaft 40. A stepped portion formed on the outer periphery of the other end of the sleeve 48 is mounted.

On the inner wall of the lid 50 on the outer surface of the bearing 49,
A disc-shaped pressure contact member 51 having an annular protrusion for pressing the outer ring of the ball bearing on one side periphery is provided inside, and the outside of the lid 50 is for pressing the center of the pressure contact member 51. A fastening bolt 52 is screwed to the center of the lid 50 so as to be axially movable from outside.

A predetermined gap G is formed between the drive-side end of the rotor 32 and the inner side surface of the first side cover 37 as an adjusting pad, and the tapered outer peripheral surface of the rotor 32 and the valve chamber 31a of the casing 31 are formed. A minute gap (not shown) is formed between the inner wall and the tapered surface.

These gaps are set in advance as suitable gaps at the time of assembly, and are kept at a constant interval by pressing the rotor 32 from outside in the axial direction with the tightening bolt 52.

Next, the operation of the rotary valve 30 will be described. FIGS. 3A to 3C are explanatory views showing the procedure of disassembling and assembling the rotor of the rotary valve.

First, an operation of disassembling the rotary valve 30 will be described. That is, by using the rotary valve 1 for a long time, the tip of the blade 33 of the rotor 32 or the casing 31
When the inner wall of the valve chamber 31a inside wears and the gap is widened, or when the gap between the gaps is small and approaches the range of thermal expansion, it is necessary to adjust each gap to an appropriate gap.

In this case, as shown in FIG. 3A, when the plurality of eyebolts 54 are removed and the second side cover 47 is removed from the end of the casing 31 as shown in FIG. 36 is released.

Next, as shown in FIG. 3B, the rotor 32 supported by the drive shaft 40 is extracted from the opening 36, and at this time, the rotor 32 is brought into contact with the stepped portion 42 at the tip of the tapered portion. Adjusting ring 43 in contact with and inserted into small diameter shaft 40b
Is in the state as it is.

Then, as shown in FIG. 3C, when the adjusting ring 43 is pulled out from the small diameter shaft 40b, the disassembling operation of the rotor 32 of the rotary valve 30 is completed.

Next, in place of the adjustment ring 43 extracted, an adjustment ring having an appropriate thickness prepared in advance is used for the drive shaft 4.
No. 0 is inserted into the small-diameter shaft 40b from the opposite end on the non-drive side and is brought into contact with the stepped portion 42 at the tip of the tapered portion.

Therefore, the rotor 32 of the rotary valve 30
Is started. At the time of the assembling work, the assembling can be performed by performing the work reverse to the procedure of the conventional disassembling work.

As described above, since the rotor 32 is formed in a tapered shape and the opening 36 for opening and closing the rotor 32 into and out of the valve chamber 31a is formed on the opposite side of the casing 31 on the non-driving side. The taking-out and assembling work is simplified, and the detachable adjusting ring 43 having a predetermined thickness is provided.
The simple work of interposing between the stepped portion 46 formed inside the boss 44 of the rotor 32 and the stepped portion 42 of the drive shaft 40, the gap between the outer diameter of the rotor 32 and the inner wall of the valve chamber 31 a. The gap can be easily adjusted.

Further, by inserting an adjusting ring 43 having a predetermined thickness corresponding to the amount of wear from the opposite end of the driving shaft 40 on the non-driving side, the rotor 32 is brought into contact with the stepped portion 42 and the rotor 32 is driven. 40, the boss 44 of the rotor 32
When the stepped portion 46 formed inside abuts the adjustment ring 43, the outer diameter of the rotor 32 and the valve chamber 31
An appropriate gap between the inner wall and the inner wall is formed.

Further, the adjustment ring 43 in which the predetermined thickness corresponding to the gap is displayed can be easily and selectively used, and the efficiency of replacement work of the adjustment ring 43 can be improved.

Further, the adjusting ring 43 of the drive shaft 40
The stepped portion 42 for positioning is formed in a tapered shape in which the non-drive side is tapered, so that when the rotor 32 is inserted into the drive shaft 40, the end of the rotor 32 is
The tapered surface becomes a guide surface even when it comes into contact with the outer periphery of 0, and can be inserted smoothly.

Although the embodiments of the present invention have been described with reference to the drawings, the specific configuration is not limited to these embodiments, and even if there are changes and additions without departing from the gist of the present invention. Included in the invention.

For example, the positioning means for abutting the abutting portion for positioning the rotor 32 on the drive shaft 40 via the adjustment ring has been described as a stepped portion, but an elongated hole orthogonal to the axial direction of the boss is formed. Along with forming a long hole in the corresponding drive shaft, a flat member formed in a tapered shape in both long holes is inserted by a predetermined amount corresponding to the amount of wear, thereby achieving the original object. Can be.

[0053]

The present invention has the following effects.

(A) According to the first aspect of the present invention, the rotor is formed in a tapered shape, and the opening is provided on the side opposite to the drive side of the casing to allow the rotor to enter and exit the valve chamber. The operation of taking out and assembling the rotor is simplified, and the simple operation of simply interposing a removable adjusting member having a predetermined thickness between the positioning means and the abutting portion of the drive shaft,
Adjustment of the gap between the outer diameter of the rotor and the inner wall of the valve chamber can be easily performed.

(B) According to the second aspect of the present invention, the adjusting member having a predetermined thickness corresponding to the wear amount is inserted from the opposite end of the driving shaft on the non-driving side, thereby bringing the adjusting member into contact with the stepped portion. When the rotor is inserted into the drive shaft in this state, an appropriate gap is necessarily formed between the outer diameter of the rotor and the valve chamber wall when the stepped portion formed in the through hole comes into contact with the adjustment member.

(C) According to the third aspect of the invention, it is possible to easily and selectively use the adjustment ring in which the predetermined thickness corresponding to the gap is displayed, thereby improving the efficiency of the adjustment ring replacement work. Can be.

(D) According to the fourth aspect of the present invention, since the contact portion of the drive shaft is formed in a tapered shape in which the non-drive side is tapered, the end of the rotor is inserted when the rotor is inserted into the drive shaft. Even if the portion contacts the outer periphery of the drive shaft, the tapered surface serves as a guide surface and can be inserted smoothly.

[Brief description of the drawings]

FIG. 1 is a sectional view of a rotary valve showing one embodiment of the present invention.

FIG. 2 is a plan view of the rotary valve.

3 (a) to 3 (c) are explanatory views showing an operation procedure for disassembling and assembling a rotor of a rotary valve.

FIG. 4A is a cross-sectional view of a conventional rotary valve taken along a drive shaft, and FIG. 4B is a cross-sectional view of FIG.

[Explanation of symbols]

 Reference Signs List 30 rotary valve 31 casing 31a valve chamber 32 rotor 33 blade 34 upper transfer port 35 lower transfer port 36 opening 37 first side cover 39 housing 39a, 39b bearing unit 40 drive shaft 40a large-diameter shaft 40b small-diameter shaft 40c one end 41 key Groove 42 Stepped part (contact part) 43 Adjusting ring (adjusting member) 44 Boss (shaft part) 44a Large diameter hole 44b Small diameter hole 45 Through square hole 46 Stepped part (positioning means) 47 Second side cover 47a Housing 48 Sleeve 49 Bearing 50 Lid 51 Pressure contact member 52 Tightening bolt 53 Bearing 54 Eye bolt 55 Bearing D Seal member G Clearance S Sheet packing W1, W2 Side wall plate

Claims (4)

[Claims] 1. A rotor rotatably mounted inside a valve chamber of a casing having upper and lower transfer ports, for separating a predetermined amount of powdery material supplied from an upper transfer port and discharging the same from a lower transfer port. The inside of the chamber is formed in a tapered shape in which the drive side is tapered, the drive side surface of the casing is closed with a first side cover, and a first bearing portion is arranged outside the first side cover, and the rotor is tapered. A rotary valve comprising: a second side cover that is formed to open and close the rotor in and out of the valve chamber on a side opposite to the drive side of the casing, and that opens and closes the opening. A first bearing portion rotatably supporting the drive shaft, one end extending outwardly, and the other extending through the rotor in the valve chamber so as to project toward the non-drive side of the casing; No. The side cover has a second bearing portion for supporting the opposite side of the drive shaft from the drive shaft. The second bearing portion has a sleeve externally fitted to a shaft end of the drive shaft, and one end of the sleeve is provided on the rotor. While being in contact with the end, a bearing is inserted into the outer periphery and the end of the sleeve, and a pressing member is provided to abut on the outer surface of the end bearing, and the pressing member presses the pressing member from outside the second side cover. The rotor is formed to be slightly shorter than the length of the valve chamber, and can be inserted from the non-drive side of the drive shaft, and is provided on a part of the drive shaft. A shaft having positioning means for restraining movement toward the drive side by contact with the shaft, a disk-shaped side wall provided at both ends of the shaft, and a periphery of the shaft located between the side walls; And a plurality of blades having an outer periphery tapered. A rotary valve, wherein an adjusting member having a predetermined thickness which is detachable from a non-drive side of the drive shaft is interposed between the positioning means and a contact portion of the drive shaft. 2. The positioning device according to claim 1, wherein a stepped portion is formed in a through hole formed in the shaft portion, and a hole on the driving side of the stepped portion is formed to have a large diameter through which the adjusting member can be inserted. The hole on the anti-drive side is formed with a small diameter, the stepped portion is formed with a through-square hole orthogonal to the axis, and the contact portion of the drive shaft is
2. The rotary valve according to claim 1, wherein the non-drive side is formed as a stepped portion having a small diameter. 3. The adjusting member according to claim 1, wherein the adjusting member has a through-hole through which a small-diameter drive shaft can be inserted, and has a predetermined thickness, and has an outer diameter smaller than that of the large-diameter drive shaft. The rotary valve according to claim 1, wherein the rotary valve is formed. 4. The rotary valve according to claim 1, wherein the contact portion of the drive shaft is formed in a tapered shape in which the opposite side is tapered, and a stepped portion is formed in the tapered end. .