JPH11241774A - Rotary valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect the abrasion state of a bearing sliding member sliding with a valve shaft which is placed in a valve casing and cannot be confirmed from outside without requiring disassembling. SOLUTION: In a rotary valve in which a valve element 16 is adjusted in a range from a closing state to an opening state by rotating a valve shaft 12 in a range of 90 degrees, and aperture of a fluid passage of a valve casing 10 is adjusted, at a position of diagonally upstream side in the rotation direction to open the valve element 16 from the upstream side of the valve shaft 12 and at other than the fluid passage, an interval detecting sensor 30 which is faced to and is adjacent to the valve shaft 12 and detects an interval distance to the valve shaft 12 is arranged on the valve casing 10. Using output signals which are outputted from this interval detecting sensor 30 and correspond to the interval distance between the valve shaft 12 and the interval detecting sensor 30, a displaying means 32 displays according to abrasion amount of a bearing sliding member 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary valve for detecting a worn state of a bearing sliding member which is in sliding relation with a valve shaft without disassembly.

[0002]

2. Description of the Related Art An example of a conventional rotary valve is shown in FIGS.
This will be described with reference to FIG. FIG. 16 is a longitudinal sectional view of a conventional rotary valve. FIG. 17 is a sectional view taken along the line AA of FIG. In FIGS. 16 and 17, a valve stem 12 having a circular cross section of a flow path is provided with a valve shaft 12 penetrating therethrough orthogonal to the flow path, and a cylindrical shape is formed at both ends of the flow path with respect to the valve body 10. Are rotatably supported by the bearing sliding members 14, 14. In addition, these bearing sliding members 14 and 14 are fitted in the valve body 10, and are suitably fixed to the valve body 10 with a split screw. The valve body 16 is fixed to the valve shaft 12 by pins 18, 18,..., And is integrated. When the valve shaft 12 rotates in a range of 90 degrees, the valve body 16 closes the flow path (FIG. 17). (A state shown by a solid line in FIG. 17) and an open state (a state shown by a two-dot chain line in FIG. 17) in which the flow path is opened and almost parallel to the flow. And between the both ends of the valve shaft 12 and the valve body 10,
The packings 20, 20 are fixed by the packing retainers 22, 22, and the through portion of the valve shaft 12 is sealed.

[0003]

In such a conventional rotary valve structure, the bearing sliding members 14 and 14 are disposed in the valve body 10, and the wear state of the bearing sliding members 14 is determined from the outside of the valve body 10. I can't confirm. By the way, in a rotary valve used for controlling a discharge flow rate, a discharge pressure, a discharge water level, and the like, the valve shaft 12 is often rotated while a fluid pressure is applied. Therefore, the bearing sliding members 14, 14 are liable to wear. In particular, the valve element 1
6 is mainly used at an intermediate opening degree of 6, the oblique force applied to the valve body 16 causes the bearing sliding member 1 to rotate.
The diagonal downstream sides of 4, 14 are easily worn. Also, the valve body 16
Is mainly used in the closed state or the open state, the downstream side of the bearing sliding members 14 is mainly worn.

[0004] When the wear of the bearing sliding members 14 and 14 remarkably progresses, the axial center of the valve shaft 12 is greatly displaced toward the wear side of the bearing sliding members 14 and 14 by the fluid pressure, and the valve shaft 12 is displaced.
When the is rotated, the outer peripheral edge of the valve body 16 comes into contact with the inner peripheral wall of the flow path of the valve body 10 so that smooth rotation cannot be performed, and the opening / closing drive power may be significantly increased. Further, since the opening / closing control becomes impossible and the flow path cannot be completely shut off, a serious accident such as a stop of the entire facility may occur.

Therefore, in the related art, the rotary valve has been periodically disassembled and inspected, the degree of wear of the bearing sliding members 14, 14 has been investigated, and replacement has been appropriately performed at an appropriate wear stage. This regular overhaul makes the maintenance of the rotary valve extremely complicated. Further, if the bearing sliding members 14, 14 are rapidly worn out for some reason within a relatively short period of time after the periodic overhaul, the bearing is not operated until the rotation of the valve shaft 12 becomes abnormal. Sliding member 1
4 and 14 defects can be recognized, and an unexpected serious accident is likely to occur.

The present invention has been made in view of the circumstances of the conventional rotary valve as described above, and has as its object to provide a rotary valve capable of detecting the degree of wear of a bearing sliding member without disassembling it. And

[0007]

In order to achieve the above object, a rotary valve according to the present invention comprises rotating a valve shaft in a range of 90 degrees to adjust a valve body in a range between a closed state and an open state. In the rotary valve that adjusts the opening degree of the fluid passage of the body, a position on an obliquely upstream side in a rotational direction that opens the valve body from the upstream side of the valve shaft or an obliquely downstream side in the rotational direction that opens the valve body from the downstream side. At a position, an interval detection sensor is disposed to be opposed to and close to the valve shaft other than the fluid passage and to detect an interval distance from the valve shaft.

In the rotary valve for adjusting the opening of the fluid passage of the valve body by rotating the valve shaft in the range of 90 degrees to adjust the valve body in the range between the closed state and the open state, At a position on the obliquely upstream side in the rotational direction that opens the valve body from the side or at a position on the obliquely downstream side in the rotational direction that opens the valve body from the downstream side, a penetration that opposes the valve shaft to the valve body other than the fluid passage. A detection sliding member is movably inserted in the axial direction into the through hole, and an elastic member is provided so that one end of the detection sliding member elastically contacts the valve shaft, and is opposed to the other end of the detection sliding member. Also, an interval detection sensor for detecting an interval distance from the detection sliding member in close proximity may be provided.

In a rotary valve for rotating a valve shaft in a range of 90 degrees to adjust a valve body in a range between a closed state and an open state, and adjusting an opening degree of a fluid passage of a valve body, an interval between the valve shaft is provided. A detection sensor is fixed, and an arc detection member having an arc shape centered on a rotation axis at a normal position of the valve shaft is arranged so that the interval detection sensor faces and approaches in the rotation range of the valve shaft. It can also be configured.

[0010] Further, it is possible to provide a display means so that a display corresponding to an interval distance between the valve shaft and the interval detection sensor is performed by an output signal of the interval detection sensor.

Further, a comparison operation means and an alarm means are provided, and the comparison operation means judges whether or not the output signal of the interval detection sensor or the change thereof exceeds a predetermined value, and determines whether or not the output signal has exceeded the predetermined value. In such a case, a warning may be issued by the warning means.

In addition, display means is provided, and the valve shaft is rotated by 90 degrees in a state in which fluid pressure is applied to the valve body, and the detection arc-shaped member and the distance detection sensor are detected by an output signal of the distance detection sensor. It is also possible to configure so as to perform display according to the interval distance.

[0013] Further, a comparison operation means and an alarm means are provided, and the valve shaft is set to 9 when fluid pressure is applied to the valve body.
After rotating by 0 degrees, the comparison operation means determines whether or not the output signal of the interval detection sensor or a change amount thereof exceeds a predetermined value, and issues an alarm by the alarm means when the output signal exceeds the predetermined value. It can also be configured as follows.

[0014]

FIG. 1 shows a first embodiment of the present invention.
This will be described with reference to FIG. FIG. 1 is a longitudinal sectional view of a first embodiment of the rotary valve according to the present invention. 2A and 2B show that the valve shaft is displaced due to wear of the bearing sliding member. FIG. 2A is a diagram showing an initial state in which the bearing sliding member is not worn, and FIG. It is a figure showing a state. FIG.
2 and FIG. 2, the same members as those in FIG. 16 and FIG.

In FIG. 1, the difference from the structure shown in FIG. 16 is that the valve body 10 is located at the lower end of the valve body 10 from the upstream side.
The distance detection sensor 30 is disposed on the valve body 10 so as to face and approach the valve shaft 12 protruding from the valve shaft 12, and an output signal of the distance detection sensor 30 is given to the display means 32. In the first embodiment shown in FIG. 1, FIG.
As shown in (b), it is assumed that the valve body 16 is mainly used in the closed state or the open state and the downstream side of the bearing sliding member 14 is worn. The interval detection sensor 30 is commercially available, and outputs a voltage having a magnitude almost directly proportional to the interval distance between the target and a ferromagnetic material such as iron as an output signal.

In this configuration, in the initial state as shown in FIG. 2A, the distance between the distance detecting sensor 30 and the valve shaft 12 is do. Then, the interval detection sensor 30 outputs an output signal of a voltage having a magnitude corresponding to the do, and the display means 32 performs display according to the interval distance do. If the bearing sliding member 14 is worn by Δd as shown in FIG. 2B, the valve shaft 12 is displaced downstream by the wear amount Δd by the fluid pressure received on the valve body 16, and the distance detecting sensor 30 is used. Distance between the valve shaft 12 and d1 = (do + Δ
d). Then, the interval detection sensor 30 outputs an output signal corresponding to the interval distance d1, and outputs the output signal.
Performs display according to this d1. Here, for example, the relationship between the magnitude of the output signal of the interval detection sensor 30 and the interval distance is stored in advance as a data table or the like, and if this is referred to, the interval distance can be indicated by a numerical value or the like. .

Therefore, the degree of wear of the bearing sliding member 14 can be determined from the display by the display means 32, and when this display exceeds a preset allowable value, that is, when the bearing sliding member 1
When the wear amount Δd of No. 4 exceeds a predetermined amount, and as a result, the interval distance between the interval detection sensor 30 and the valve shaft 12 exceeds an allowable range, the rotary valve is disassembled and the bearing sliding members 14 are replaced. Good. In the present invention, the rotary valve may be disassembled and replaced at the most economical replacement point immediately before the bearing sliding members 14 actually wear and reach the permissible limit. Since there is no need, maintenance and management can be greatly reduced.

Further, if the valve element 16 is mainly used at an intermediate opening degree of about 45 degrees, as shown in FIG. 3, the bearing sliding member 14 is worn diagonally downstream. Then, the interval detection sensor 30 is opposed to and close to the valve shaft 12 obliquely upstream by about 45 degrees in the rotation direction of the valve body 16 so that the valve body 1 is opened.
0 may be arranged. With this configuration, the wear amount Δd on the oblique downstream side of the bearing sliding member 14 can be measured by the interval detection sensor 30.
Can be detected more reliably. Then, the output signal of the interval detection sensor 30 is given to the calculating means 34 to which a signal corresponding to the interval distance do in the initial state is given,
The difference between the two may be calculated by the calculating means 34, and a signal corresponding to the wear amount Δd of the bearing sliding member 14 may be given to the display means 32. Therefore, the display means 32 can display a numerical value or the like corresponding to the wear amount Δd of the bearing sliding member 14.

In the case where the opening degree of the valve body 16 in the main use state is unknown or is not used at a specific opening degree, as shown in FIG. 4, the two interval detecting sensors 30, 30 are used. It is sufficient to dispose the valve body 10 on the upstream side and on the upstream side at an angle of about 45 degrees in the opening direction of the valve body 16 so as to face and approach the valve shaft 12 respectively. With such a configuration, it is possible to reliably detect wear at any position on the downstream side of the bearing sliding member 14 at an angle of about 45 degrees obliquely downstream in the rotation direction in which the valve body 16 opens. Then, the output signals of the two interval detection sensors 30, 30 are respectively supplied to the calculating means 36, the larger signal is selected, and the selected signal is supplied to the display means 32. It is needless to say that the two interval detection sensors 30 are adjusted so that the magnitudes of the output signals in the initial state are the same. Therefore, the display of the display means 32 is performed in accordance with the larger wear amount Δd on the downstream side or the obliquely downstream side of the bearing sliding member 14.

Here, the valve element 16 rotates only within a range of 90 degrees, and a fluid pressure is applied to the valve element 16 to force the valve element 16 from the downstream direction to the obliquely downstream side in the rotational direction in which the valve element 16 opens. The bearing sliding member 14 wears only in the obliquely downstream range from the downstream side to the rotation direction of the valve body 16 in the opening direction of the valve body 16 at an angle smaller than 90 degrees, at most about 45 degrees. Therefore, if one interval detection sensor 30 is provided, it may be provided on the oblique upstream side in the rotation direction in which the valve element 16 opens from the upstream side so that the amount of wear of the bearing sliding member 14 can be detected best. . Also, if a plurality of the interval detecting sensors 30 are provided, similarly, if the amount of wear of the bearing sliding member 14 can be detected best, the oblique angle of rotation of the valve body 16 from the upstream side can be increased from the upstream side. What is necessary is just to arrange | position at an equally dividing position in the range of the upstream side. Note that the interval detection sensor 30 may be disposed in a range obliquely downstream from the downstream side in the rotation direction of the valve body 16. In the case of such a configuration, the bearing sliding member 1
The wear amount of No. 4 is detected as a decrease in the interval distance. If a plurality of interval detection sensors 30 are arranged in a range from the downstream side to the oblique downstream side, the smallest output signal among the output signals may be selected and displayed on the display means 32.

Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 5 is a longitudinal sectional view of a main part of a second embodiment of the rotary valve according to the present invention. 5, the same members as those in FIG. 1 are denoted by the same reference numerals, and redundant description will be omitted.

In the second embodiment shown in FIG.
A through hole 40 is drilled from the upstream side toward the valve shaft 12 at the lower end of the zero. A detection sliding member 42 is inserted into this through hole 40 so as to be movable in the axial direction. It comes into contact with the valve shaft 12. An O-ring 44 is inserted and disposed in the middle of the detection sliding member 42 so that the through hole 40 has a watertight structure. The through hole 40 has an enlarged diameter portion 40 a provided on the opening side of the valve body 10.
An enlarged part 42a is provided in the middle part of No. 2. Further, a lid 46 is provided at the opening end of the through hole 40 of the valve body 10 so that the detection sliding member 42 can penetrate and does not come off.
Then, a coil spring 48 as an elastic member is contracted between the lid 46 and the expanded portion 42a, and the detection sliding member 42 is elastically urged toward the valve shaft 12 side.
Is elastically connected to the valve shaft 12. This detection sliding member 42
The distance detecting sensor 30 is disposed and fixed to the valve body 10 so as to face and approach the other end of the valve body 10. Then, the output signal of the interval detection sensor 30 is provided to the display means 32 and the comparison calculation means 50. The comparison operation means 50 includes the bearing sliding member 1.
A predetermined value corresponding to the allowable limit of the wear amount of No. 4 is given, and the predetermined value is compared with the output signal. When the output signal exceeds a predetermined value, a warning signal is given to the warning means 52.

In such a configuration, the bearing sliding member 14
When the valve shaft 12 is displaced due to wear of the shaft, the axial position of the detection sliding member 42 changes in accordance with the displacement, whereby the distance between the distance detection sensor 30 and the detection sliding member 42 changes. Similarly, the change is detected as a change in the output signal. In the second embodiment, the displacement of the valve shaft 12 near the bearing sliding member 14 can be detected. Further, the detection can be performed even if the valve shaft 12 does not protrude from the valve body 10, and the present invention can be applied to a rotary valve having a structure in which the lower end of the valve shaft 12 does not protrude from the valve body 10. In addition, the signal is displayed on the display means 32 in accordance with the output signal of the interval detection sensor 30, and when the output signal exceeds a predetermined value which is an allowable limit, an alarm signal is given from the comparison operation means 50 to the alarm means 52. , An alarm is issued from the alarm means 52. This alarm may be any sound or light. Further, the display means 32 may be used as the alarm means 52 by blinking a display corresponding to the output signal from the display means 32 or the like. Then, the rotary valve may be disassembled and replaced in response to the alarm. If the interval detection sensor 30 is provided on the downstream side, the alarm means 52 may issue an alarm when the output signal becomes smaller than a predetermined value.

Further, a third embodiment of the present invention will be described with reference to FIGS. FIG. 6 is a longitudinal sectional view of a main part of a third embodiment of the rotary valve according to the present invention. FIG. 7 is an enlarged view as viewed from the arrow B in FIG. FIG. 8 is a diagram showing an arrangement position of the interval detection sensor as viewed from arrow C in FIG. FIG. 9 shows the valve shaft 9
It is a figure which shows the output signal of the interval detection sensor which changes by the maximum wear amount and the maximum wear position of the bearing sliding member by rotating by 0 degree. 6, the same members as those in FIG. 1 are denoted by the same reference numerals, and redundant description will be omitted.

In the third embodiment, when the valve body 16 is in the closed state, the interval detection sensor 30 is disposed on the valve shaft 12 obliquely upstream by 45 degrees opposite to the rotation direction in which the valve body 16 opens. You. Then, the detection body 6 having an arc shape centered on the axis in the normal state in the initial state of the valve shaft 12 is provided on the valve body 10.
0 is the upstream side in the rotation range of the valve shaft 12 and the interval detection sensor 3
It is disposed and fixed to the valve body 10 so as to be opposed to and close to 0.
The output signal of the interval detection sensor 30 is
And the signal from the calculating means 62 is
2 given.

In this configuration, when the bearing sliding member 14 is not worn, even if the valve shaft 12 is rotated by 90 degrees, the distance between the distance detecting sensor 30 and the detecting arc-shaped member 60 is constant. The output signal of the sensor 30 is also a constant normal value Xo as indicated by X in FIG. However, when the bearing sliding member 14 wears, the position of the valve shaft 12 shifts, so that in the closed state shown by the solid line in FIG. 7, the intermediate opening degree of 45 degrees shown by the dotted line, and the open state shown by the two-dot chain line, The interval distance between the interval detection sensor 30 and the detection arc-shaped member 60 changes. That is, the downstream side of the bearing sliding member 14 is ΔY
If the valve shaft 12 is rotated 90 degrees, the distance between the distance detection sensor 30 and the detection arc-shaped member 60 changes so as to become the maximum at an intermediate opening of 45 degrees. Output signal changes like Y in FIG. Further, when the bearing sliding member 14 has a 45 ° oblique downstream side, Δ
If Z is worn, when the valve shaft 12 is rotated by 90 degrees, the distance between the interval detection sensor 30 and the detection arc-shaped member 60 changes so as to increase from the closed state to the open state. It changes like this. Therefore, the valve shaft 12 is set to 9
By rotating the bearing sliding member 14 by 0 degree, the maximum wear amount and the maximum wear position of the bearing sliding member 14 can be detected.

Further, as shown in FIG. 10, an interval detecting sensor 30 may be arranged on the valve shaft 12 in the closed state of the valve body 16 toward the upstream. In the valve body 10, an arc-shaped detection arc-shaped member 60 centered on the axis in the normal state in the initial state of the valve shaft 12 extends 90 degrees in the opening direction of the valve body 16 from the upstream side. It is disposed and fixed facing and close to the interval detecting sensor 30 in the twelve rotation ranges.

In such a configuration, when the bearing sliding member 14 is not worn, even if the valve shaft 12 is rotated by 90 degrees, the distance between the distance detecting sensor 30 and the detecting circular member 60 is a constant normal value Xo. In addition, the output signal of the interval detection sensor 30 is also constant as indicated by X in FIG. However, if the downstream side of the bearing sliding member 14 is worn by ΔY, the rotation of the valve shaft 12 by 90 degrees causes the interval detection sensor 3 to rotate.
The interval distance between 0 and the detection arc-shaped member 60 changes so as to be maximum in the closed state and almost a normal value in the open state, and the output signal of the interval detection sensor 30 changes as Y in FIG. If the bearing sliding member 14 is worn by ΔZ on the 45 ° obliquely downstream side, rotating the valve shaft 12 by 90 ° makes the interval distance between the interval detecting sensor 30 and the detecting arc-shaped member 60 an intermediate value of 45 °. The opening degree changes so as to become maximum, and changes like Z in FIG. Therefore, by rotating the valve shaft 12 by 90 degrees, the maximum wear amount and the maximum wear position of the bearing sliding member 14 can be similarly detected.

Then, as shown in FIG. 12, when the valve body 16 is closed, the interval detecting sensor 30 is attached to the valve shaft 12.
May be disposed at an angle of 45 degrees toward the upstream side in the opening rotation direction. In the valve body 10, an arc-shaped detection arc-shaped member 60 centered on the axial center of the valve shaft 12 in the initial state and the normal state is provided on the valve body 10 from the oblique upstream side in the rotation direction of the valve body 16 in the opening direction of 45 degrees to the oblique downstream side For 90 degrees, it is disposed and fixed facing and close to the interval detection sensor 30 in the rotation range of the valve shaft 12.

In this configuration, when the bearing sliding member 14 is not worn, even if the valve shaft 12 is rotated by 90 degrees, the interval distance between the interval detection sensor 30 and the detection arc-shaped member 60 is a constant normal value Xo. In addition, the output signal of the interval detection sensor 30 is also constant as indicated by X in FIG. However, if the downstream side of the bearing sliding member 14 is worn by ΔY, the rotation of the valve shaft 12 by 90 degrees causes the interval detection sensor 3 to rotate.
The distance between 0 and the detection arc-shaped member 60 is 4 at the maximum in the closed state.
At an intermediate opening of 5 degrees, the value changes to substantially a normal value and becomes smaller than the normal value in the open state.
The output signal of 0 changes like Y in FIG. Also, if the bearing sliding member 14 is worn by ΔZ on the 45 ° oblique downstream side, rotating the valve shaft 12 by 90 ° will cause the distance between the distance detecting sensor 30 and the detecting arc-shaped member 60 to be maximum in the closed state. 1 changes to almost a normal value in the open state.
It changes like Z of 3. Therefore, by rotating the valve shaft 12 by 90 degrees, the maximum wear amount and the maximum wear position of the bearing sliding member 14 can be similarly detected.

Further, as shown in FIG. 14, when the valve body 16 is in the closed state, the interval detecting sensor 30 is disposed on the valve shaft 12 in the direction of 90 degrees in the rotation direction of the valve body 16 from the upstream side. good. In the valve body 10, an arc-shaped detection arc-shaped member 60 centered on the axial center of the valve shaft 12 in the initial state and the normal state is located 90 degrees from the upstream side in the rotation direction of the valve body 16.
From 90 degrees to 90 degrees downstream from the position, the valve shaft 12 is disposed and fixed to be opposed to and close to the interval detection sensor 30 in the rotation range of the valve shaft 12.

In this configuration, when the bearing sliding member 14 is not worn, even if the valve shaft 12 is rotated by 90 degrees, the distance between the distance detecting sensor 30 and the detecting circular member 60 is a constant normal value Xo. In addition, the output signal of the interval detection sensor 30 is also constant as indicated by X in FIG. However, if the downstream side of the bearing sliding member 14 is worn by ΔY, the rotation of the valve shaft 12 by 90 degrees causes the interval detection sensor 3 to rotate.
The interval distance between 0 and the detection arc-shaped member 60 changes so that it is almost normal at the maximum in the closed state and smaller than the normal value in the open state, and the output signal of the interval detection sensor 30 is as shown by Y in FIG. Change. If the bearing sliding member 14 is worn by 45 at the 45 ° oblique downstream side, the valve shaft 12
When is rotated by 90 degrees, the distance between the interval detection sensor 30 and the detection arc-shaped member 60 changes so as to be almost normal at a maximum intermediate opening of 45 degrees in the closed state and smaller than the normal value in the open state. It changes like Z in FIG. Therefore,
By rotating the valve shaft 12 by 90 degrees, the maximum wear amount and the maximum wear position of the bearing sliding member 14 can be similarly detected.

In the third embodiment, the interval detecting sensor 3
0 is disposed such that its orientation is in the range rotated by 90 degrees from the upstream side or the upstream side, but is not limited to this, and is disposed toward the range rotated by 90 degrees from the downstream side or the downstream side. May be provided. Then, the interval detection sensor 30
It is needless to say that the detection arc-shaped member 60 is provided according to the rotation range of. Further, the interval detection sensor 30 is connected to the valve shaft 1.
It is not necessary to dispose radially from the axis of the second.

In the above embodiment, the interval detecting sensor 30 is provided at the lower end of the valve body 10. Here, while a valve driving device is connected to the upper end of the valve shaft 12, a similar device is not connected to the lower end. Therefore, the wear of the bearing sliding member 14 at the lower end of the valve shaft 12 to which the valve driving device is not mechanically connected is increased. For this reason, the interval detection sensor 30 is provided at the lower end of the valve body 10 in order to detect the amount of wear of the bearing sliding member 14 at the lower end that is easily worn. However, the present invention is not limited to this, and the interval detection sensors 30 may be provided at the upper end of the valve body 10, and the interval detection sensors 3 may be provided at both ends of the valve body 10.
0 and 30 may be provided respectively. Furthermore, the rotary valve is not limited to the one in which the valve shaft 12 is provided in the vertical direction, and may be one in which the rotary shaft is provided in the horizontal direction. In such a case, the valve shaft 12
It will be readily understood that the interval detection sensor 30 may be provided at at least one end or both ends of the sensor. Further, in the first and second embodiments, the interval detection sensor 30 is fixedly disposed on the valve body 10, but is not limited to this, and may be attached to another member having a fixed fixed positional relationship relative to the valve body 10. It may be arranged. Similarly, the detection arc-shaped member 60 of the third embodiment may be disposed on another member having a fixed fixed positional relationship relative to the valve body 10.

[0035]

As described above, since the rotary valve according to the present invention is constituted, the following special effects can be obtained.

In the rotary valve according to the first aspect, when the bearing sliding member wears out and the valve shaft is displaced, this is detected as a change in the distance between the valve shaft and the distance detecting sensor.
The wear degree of the bearing sliding member can be known without disassembling the rotary valve. Using this as a guide, the rotary valve can be disassembled at the appropriate time to replace the bearing sliding member, making maintenance and management easier than conventional ones that require regular disassembly and inspection. It is. Moreover, even if the bearing sliding member is rapidly worn out for some reason, it is possible to appropriately disassemble the rotary valve and replace the bearing sliding member before a serious accident occurs. .

In the rotary valve according to the second aspect, the wear amount of the bearing sliding member can be known as in the first aspect. Moreover, since the displacement of the valve shaft is detected closer to the bearing sliding member, the wear amount of the bearing sliding member can be detected more accurately. Further, the valve shaft does not have to protrude from the valve body, and is suitable for a rotary valve in which the sealing structure due to the valve shaft protruding from the valve body poses a problem.

Further, in the rotary valve according to the third aspect,
By rotating the valve shaft by 90 degrees, the maximum wear amount of the bearing sliding member and its maximum wear position can be known.

In the rotary valve according to the fourth or sixth aspect, since the display is performed by the display means in accordance with the output signal of the interval detection sensor, the wear amount of the bearing sliding member can be reduced by confirming the display. You can always know. Therefore, it is easy to predict the time when the rotary valve should be disassembled and replaced by referring to these displays.

In the rotary valve according to the fifth or seventh aspect, an alarm is issued when the degree of wear of the bearing sliding member exceeds an allowable value, and the rotary valve is disassembled and replaced in response to the alarm. be able to.

[Brief description of the drawings]

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

FIGS. 2A and 2B show that the valve shaft is displaced due to wear of the bearing sliding member, FIG. 2A is a diagram showing an initial state in which the bearing is not worn, and FIG. It is a figure showing a state.

FIG. 3 is a view showing a state in which the diagonal downstream side of the bearing sliding member is worn in the first embodiment of FIG.

FIG. 4 is a view showing that two interval detecting sensors may be provided when the wear position of the bearing sliding member is unknown in the first embodiment of FIG. 1;

FIG. 5 is a longitudinal sectional view of a main part of a second embodiment of the rotary valve according to the present invention.

FIG. 6 is a longitudinal sectional view of a main part of a third embodiment of the rotary valve according to the present invention.

FIG. 7 is an enlarged view as viewed in the direction of arrow B in FIG. 6;

FIG. 8 is a diagram showing an arrangement position of an interval detection sensor as viewed from an arrow C in FIG. 6;

FIG. 9 is a diagram showing output signals of an interval detection sensor that change according to the maximum wear amount and the maximum wear position of the bearing sliding member by rotating the valve shaft by 90 degrees.

FIG. 10 is a view showing a structure of the third embodiment of FIG. 6 in which the arrangement position of the interval detection sensor is changed.

11 is a diagram showing output signals of an interval detection sensor that changes according to the maximum wear amount and the maximum wear position of the bearing sliding member by rotating the valve shaft by 90 degrees in the structure shown in FIG. 10;

FIG. 12 is a view showing a structure of the third embodiment of FIG. 6 in which the arrangement position of the interval detection sensor is further changed.

13 is a diagram showing output signals of an interval detection sensor that changes according to the maximum wear amount and the maximum wear position of the bearing sliding member by rotating the valve shaft by 90 degrees in the structure shown in FIG. 12;

FIG. 14 is a view showing another structure of the third embodiment of FIG. 6 in which the arrangement position of the interval detection sensor is further changed.

FIG. 15 is a diagram showing output signals of an interval detection sensor that changes according to the maximum wear amount and the maximum wear position of the bearing sliding member by rotating the valve shaft by 90 degrees in the structure shown in FIG. 14;

FIG. 16 is a longitudinal sectional view of a conventional rotary valve.

FIG. 17 is a sectional view taken along the line AA of FIG. 16;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Valve body 12 Valve shaft 14 Bearing sliding member 16 Valve element 30 Interval detection sensor 32 Display means 34, 36, 62 Calculation means 40 Through hole 42 Detection sliding member 48 Coil spring 50 Comparison calculation means 52 Alarm means 60 Detection arc shape Element

Claims (7)

[Claims] 1. A rotary valve for rotating a valve shaft in a range of 90 degrees to adjust a valve body between a closed state and an open state to adjust an opening degree of a fluid passage of a valve body. A valve that is opposed to and proximate to the valve shaft except for the fluid passage at a position on an obliquely upstream side in a rotational direction that opens the valve body from the side or a position on an obliquely downstream side in a rotational direction that opens the valve body from a downstream side. A rotary valve comprising an interval detection sensor for detecting an interval distance from a shaft. 2. A rotary valve for rotating a valve shaft in a range of 90 degrees to adjust a valve body in a range between a closed state and an open state to adjust a degree of opening of a fluid passage of a valve body. At a position obliquely upstream in the rotational direction that opens the valve body from the side or at a position diagonally downstream in the rotational direction that opens the valve body from the downstream side, a penetration that opposes the valve shaft to the valve body other than the fluid passage. A detection sliding member is movably inserted in the axial direction into the through hole, and an elastic member is provided so that one end of the detection sliding member elastically contacts the valve shaft, and is opposed to the other end of the detection sliding member. And a distance detection sensor for detecting a distance between the detection sliding member and the detection sliding member in close proximity thereto. 3. A rotary valve for rotating a valve shaft in a range of 90 degrees to adjust a valve body in a range between a closed state and an open state to adjust an opening degree of a fluid passage of a valve body. A detection sensor is fixed, and an arc detection member having an arc shape centered on a rotation axis at a normal position of the valve shaft is arranged so that the interval detection sensor faces and approaches in the rotation range of the valve shaft. A rotary valve, comprising: 4. The rotary valve according to claim 1, further comprising a display unit, wherein a display is performed in accordance with an interval distance between the valve shaft and the interval detection sensor based on an output signal of the interval detection sensor. A rotary valve. 5. The rotary valve according to claim 1, further comprising a comparison operation unit and an alarm unit, wherein the comparison operation unit determines whether an output signal of the interval detection sensor or a change thereof exceeds a predetermined value. A rotary valve characterized in that a comparison is made and an alarm is issued by the alarm means when the predetermined value is exceeded. 6. The rotary valve according to claim 3, further comprising a display unit, wherein the valve shaft is rotated by 90 degrees in a state where a fluid pressure is applied to the valve body, and the output signal of the interval detection sensor is used to rotate the valve shaft by 90 degrees. A rotary valve configured to perform display according to the distance between the detection arc-shaped member and the distance detection sensor. 7. The rotary valve according to claim 3, further comprising a comparison operation unit and an alarm unit, wherein the valve shaft is rotated by 90 degrees in a state in which fluid pressure is applied to the valve body, and A rotary valve configured to determine whether the output signal or a change thereof exceeds a predetermined value by the comparison operation means, and to issue an alarm by the alarm means when the output signal or the change exceeds the predetermined value. .