JP2023174215A - valve - Google Patents

Abstract

To provide a valve facilitating mounting a bearing for suppressing decentering, and having a structure for reducing the number of parts of a casing.SOLUTION: A valve 1 includes a valve body for opening/closing a fluid passage disposed in a body, an actuator for moving the valve body, and a casing 20 for storing the actuator. The actuator includes: a drive unit 10 having a rotary drive shaft 23; a shaft 41 that moves the valve body by changing rotation motion of the drive shaft to linear motion and has a thick diameter part; a coupling 24 for connecting the drive shaft and the shaft; and a bearing 30 for suppressing the axial displacement of the shaft. An inner ring 33 is placed on the top face of the thick diameter part 42, and the shaft is provided with inner ring locking means 70 for locking the inner ring to the shaft by pressing the top face of the inner ring in the direction of the thick diameter part, and outer ring locking means for locking an outer ring to the casing by pressing downward the top face of the outer ring 31.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD This invention relates to valves that control fluid flow.

FIG. 4 shows a fluid control valve (valve) 201 of Patent Document 1, which is composed of a lower valve section 202 and an upper actuator section 203. The valve portion 202 includes a body 204 in which fluid channels 206, 206 and a valve seat 205 are formed, and a valve stem 208 in which a valve body 207 is formed is inserted inside.

The actuator unit 203 has a motor 220 housed in a motor cover 221 disposed in the upper part, and is provided with a coupling 223 that connects the motor shaft 222 and the upper ball screw shaft 246 of the ball screw shaft 247 of the ball screw 230. 221 and the upper ball screw shaft 246 are connected by a set screw 223. The bearing 225 is arranged so that the core of the ball screw shaft 247 does not run out, and the bearing 225 is supported by the stop plate 226 and the large diameter part 229. 251, and an inner ring (no reference numeral) of a bearing 225 is fixed to the upper ball screw shaft 246 with a nut 224 from above.

A slider 233 is fixed to a ball screw 230 with a bolt 248, and a female ball screw thread 232 and a lower ball screw shaft 245 are housed in a recess of the slider 232. The lower casing 237 is equipped with a bush 240 and accommodates a shaft 236 connected to the valve rod 208. The middle casing 234 and the motor cover 221 are connected by bolts 249, and the upper casing 251 and the middle casing 234 are It is connected with a bolt 250.

FIG. 5 is a partially enlarged view of an actuator section having a similar function to the conventional valve shown in FIG. Parts with the same reference numerals have the same functions. The bearing 225 is composed of an inner ring 225i, an outer ring 225e, and balls 225b. The outer ring 225e is supported by a stop plate 226, and the stop plate 226 is fixed to the upper casing 251 with bolts 227. The inner ring 225i is supported by a large diameter portion 229, tightened with a nut 224, and fixed to the upper ball screw shaft 246 by being screwed into an upper ball screw shaft male screw 230m carved in the upper ball screw shaft 246. This structure suppresses core wobbling of the upper ball screw shaft male thread 246.

Retable 2018-199064 Publication

The conventional valve 201 shown in FIG. 5 has two problems. The first problem is assembly. The second problem is that two casings, the upper casing 251 and the middle casing 234, are required to house the actuator.

FIG. 6 schematically shows the procedure for assembling the valve 201 of FIG. 5. The assembly procedure proceeds from (A) to (B) and is completed at (C). In (A), the ball screw 230 is fixed to the slider 233 using bolts 248, the stop plate 226 is fitted, the bearing 225 is inserted, and the ball screw 230 is placed on the large diameter portion 229. Thereafter, the nut 224 is tightened to fix the inner ring of the bearing 225 to the upper ball screw shaft 246. A coupling 223 is used to connect the motor shaft 222 and the upper ball screw shaft 246.

Next, moving to (B), the stop plate 226 is connected to the upper casing 251 using bolts 227. At this time, when tightening the bolt 227, the work becomes very difficult because the ball screw 230 and the bolt 248 are close to each other downward. This is the first problem.

Then, moving to (C), the upper casing 251 and the middle casing 234 are fixed using bolts 250. The bearing 225 is fixed from below using a stop plate 226 and from above using a nut 224. The locking bolt 252 restricts rotation of the assembly (B) in the middle casing 234. Due to this structure, the casing must be divided into two parts, an upper casing 251 and a middle casing 234. This is the second problem.

The present invention has been made in view of these points, and its purpose is to facilitate the assembly of bearings to suppress core vibration in valve assembly, and to reduce the number of parts in the casing that houses the actuator. Our goal is to provide valves with a structure.

The present invention (1) is a valve that includes a valve body that opens and closes a fluid flow path provided in a body, an actuator that moves the valve body, and a casing that houses the actuator, wherein the actuator rotates. a shaft having a large diameter portion that moves the valve body by converting rotational motion of the drive shaft into linear motion; and a coupling that connects the drive shaft and the shaft. , a bearing for suppressing axial wobbling of the shaft, the inner ring of the bearing is placed on the upper surface of the large diameter portion, and the shaft is provided with a bearing that presses the upper surface of the inner ring in the direction of the large diameter portion. an inner ring locking means for locking the inner ring to the shaft, and an outer ring locking means for pressing the upper surface of the outer ring downward to lock the outer ring of the bearing to the casing. It's a valve.

In the present invention (1), the inner ring of the bearing is placed on the upper surface of the large diameter portion, and the inner ring is fixed to the shaft by pressing the upper surface of the inner ring in the direction of the large diameter portion. An inner ring locking means is provided to lock the outer ring to the casing, and an outer ring locking means is provided to press the upper surface of the outer ring downward to lock the outer ring to the casing. Moreover, it can be fixed from above, and there are no obstructions nearby, making the work easier. Furthermore, since there is no need to divide the casing into two parts, the number of parts can be reduced.

Although the valve described in Patent Document 1 uses an electric motor as its driving source, the driving source in the valve of the present invention (1) is not limited to an electric motor or the like, but may also be a valve that uses a bearing to suppress core wobbling. If so, it is clear that a gas-based drive source or a manual handle can be used as the drive source.

The present invention (2) is the valve according to the present invention (1), wherein the inner wall of the casing is provided with an inward protrusion that supports the lower surface of the outer ring.

In the present invention (2), since the inner wall of the casing is provided with an inward protrusion that supports the lower surface of the outer ring, the outer ring of the bearing is supported by the inner protrusion on the lower surface side, and the outer ring is locked on the upper surface side. Since the bearing is held down by a means, the bearing can be arranged more stably.

In the present invention (3), the inner ring locking means is an annular lock nut for the inner ring, and the inner ring has a female thread carved on the inner surface thereof to be screwed into a male thread carved on the outer peripheral surface of the shaft. This is the valve of the present invention (1) which is a lock nut for use in a vehicle.

In the present invention (3), the inner ring locking means is an annular lock nut for the inner ring, and the inner ring has a female thread carved on the inner surface thereof to be screwed into a male thread carved on the outer peripheral surface of the shaft. The inner ring can be securely fixed with the inner ring locking means having a structure that is easy to manufacture.

In the present invention (4), the outer ring locking means is an annular outer ring lock nut, and the outer ring lock nut has a male thread carved on the outer surface thereof that engages with a female thread carved on the inner surface of the casing. The valve of the present invention (1) is a lock nut.

In the present invention (4), the outer ring locking means is an annular lock nut for the outer ring, and the outer ring lock nut has a male thread carved on the outer surface thereof that engages with a female thread carved on the inner surface of the casing. Since it is a lock nut, the outer ring can be securely fixed with an outer ring locking means that is easy to manufacture.

In the present invention (5), the shaft includes a ball screw, and a ball screw shaft closer to the drive shaft than the large diameter portion of the ball screw is connected to the drive shaft by the coupling, and Any one of the present invention (1) to (5), characterized in that a ball nut is provided on the valve body side, and the valve body connected to the ball nut moves linearly in conjunction with the rotation of the ball screw shaft. This is a valve.

In the present invention (5), the shaft includes a ball screw, and the ball screw shaft of the ball screw closer to the drive shaft than the large diameter portion is connected to the drive shaft by the coupling, and A ball nut is provided on the valve body side, and the valve body connected to the ball nut moves linearly in conjunction with the rotation of the ball screw shaft, so a general-purpose ball screw can be used to precisely perform rotational movement. The valve body can be moved by converting it into a linear motion.

According to the present invention, in assembling the valve, it is possible to provide a valve having a structure in which it is easy to assemble a bearing for suppressing core wobbling, and the number of parts of a casing that houses an actuator is reduced.

FIG. 1 is a partial cross-sectional view of a valve according to a first embodiment of the present invention. FIG. 7 is a partial cross-sectional view of a valve according to a second embodiment of the present invention. FIG. 1 is a schematic diagram showing an assembly procedure of a valve according to a first embodiment of the present invention. FIG. 2 is an overall view of the valve described in Patent Document 1. FIG. 2 is a partial cross-sectional view of an actuator section of the valve described in Patent Document 1. 6 is a schematic diagram showing an assembly procedure of the valve of FIG. 5. FIG.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings. Note that the following embodiments are essentially preferable examples, and are not intended to limit the scope of the present invention, its applications, or its uses.

<First embodiment>
FIG. 1 shows a first embodiment of the invention.

The valve 1 includes a motor 10 housed within a motor cover 21 as a driving device. The upper ball screw shaft 46 of the ball screw 40 and the motor shaft 23, which is a drive shaft, are connected by a set screw 25 of a coupling 24. Two bearings 30 are fitted into the upper ball screw shaft 46. The bearing 30 is composed of an outer ring 31, an inner ring 33, and balls 32. The inner ring 33 is placed on the upper surface of the large diameter portion 42 , and the outer ring 31 is placed on the upper surface of the inner protrusion 27 . In this embodiment, two bearings 30 are stacked, but the number is not limited to two and may be one or three or more. Components such as the body, fluid flow path, and valve body are omitted in FIGS. 1 to 3 because they can be the same as those used in the valve shown in FIG. 4.

The inner ring 33 is screwed to the upper ball screw shaft 46 by the inner ring lock nut 70 having the inner ring lock nut female thread 71 carved therein. Fixed. The outer ring 31 is fixed to the casing 20 by screwing together the outer ring lock nut male thread 81 of the outer ring lock nut 80 and the casing female thread 28 of the casing 20 . The outer ring lock nut 80 is rotated by applying a special tool to the hole 82.

A lower ball screw shaft 45 is formed below the ball screw shaft 47 and is screwed into the ball nut 43, and the ball nut 43 and the slider 50 are fixed with bolts 44. A bush 52 is fitted to the lower outer circumference of the slider 50, and a slider female thread 51 carved on the inner circumferential surface of the slider 50 and a stem male thread 63 of a stem 60 are screwed together, and the ball nut 43, the slider 50, It is a mechanism that moves up and down together with the stem 60. The casing 20 and the motor cover 21 are fixed with bolts 26. The lower end of the lower ball screw shaft 45 enters a recess 61 formed in the upper part of the stem 60. Rotation of the slider 50 within the casing 20 is restricted by the stop bolt 29 . A lower O-ring 62 prevents fluid from leaking out of the valve.

By adopting the valve structure as shown in FIG. 1, the bearing 30 can be easily assembled and the manufacturing efficiency of the valve can be increased. The details will be explained with reference to FIG. Further, unlike the valve of Patent Document 1, two casings, an upper casing and a middle casing, are not required, and only one casing 20 is sufficient. This allows product costs to be reduced.

<Second embodiment>
FIG. 2 shows a second embodiment of the invention.

A valve 101 according to the second embodiment of the present invention shown in FIG. 2 has the same basic structure as the valve 1 according to the first embodiment shown in FIG. Since each member is shown in , detailed explanation will be omitted. The difference is that a casing lower flange 128 is formed below the casing 120, the cylindrical outer case 122 extends to the motor cover 121, is fixed to the casing 120 with bolts 126, and the outer case 122 and the casing 120 are An O-ring 129 is placed on the holder to provide double shielding. By adopting such a structure, it is possible to improve the shielding performance and the appearance.

FIG. 3 is a schematic diagram showing the assembly procedure of the valve according to the first embodiment (FIG. 1) of the present invention. The explanation will be given in the order of (A), (B), and (C).
In (A), the ball nut 43 of the ball screw 40 is fixed to the slider 50 using a bolt 44. The bushes 52 are fitted together, and the stem 60 and the slider 50 are screwed together and fixed. Two bearings 30 are inserted and arranged on the upper surface of the large diameter portion 42 of the ball screw 40. The inner ring 33 is fixed to the ball screw shaft 41 by screwing the inner ring lock nut 70 together. The work of fixing the bearing 30 to the ball screw shaft 41 in this assembly can be easily performed.

In (B), the assembly assembled in (A) is inserted into the casing 20. At this time, the lower surface of the outer ring 31 of the bearing 30 is placed in contact with the upper surface of the inner protrusion 27. A special tool is fitted into the hole 82 of the outer ring lock nut 80 and rotated to fix the outer ring 31 of the bearing 30 to the casing 20. A coupling 24 is fixed to the motor shaft 23 of the motor 10 using an upper set screw 25. Thereafter, the coupling 41 is lowered down and inserted to the upper end of the ball screw shaft 41, and the motor shaft 23 and the ball screw shaft 41 are coupled with the set screw 25 on the lower side. Rotation of the slider 50 within the casing 20 is restricted by the stop bolt 29 .

In (C), a motor cover 21 is placed over the motor 10, and the motor cover 21 and the casing 20 are fixed using bolts 26. Looking at this series of assembly operations, compared to the valve disclosed in Patent Document 1, the operation is easier, and the number of constituent members is reduced, allowing for cost reduction.

As explained above, in the valve of the present invention, it is easy to assemble the bearing for suppressing core vibration during assembly, and it is possible to provide a valve having a structure that reduces the number of parts of the casing that houses the actuator. can.

1, 101 Valve 10, 110 Motor 20, 120 Casing 21, 121 Motor cover 23, 123 Motor shaft 24, 124 Coupling 25, 125 Set screw 26, 126 Bolt 27, 127 Inner protrusion 28, 128 Casing female thread 29, 129 Set bolt 30, 130 Bearing 31, 131 Outer ring 32, 132 Ball 33, 133 Inner ring 40, 140 Ball screw 41, 141 Ball screw shaft 42, 142 Large diameter part 43, 143 Ball nut 44, 144 Bolt 45, 145 Lower ball Screw shaft 46, 146 Upper ball screw shaft 47, 147 Bow screw shaft 48, 148 Upper ball screw shaft male thread 50, 150 Slider 51, 151 Slider female thread 52, 152 Bush 60, 160 Stem 61, 161 Recess 62, 162 O-ring 63, 163 Stem male thread 70, 170 Lock nut for inner ring 71, 171 Female thread of lock nut for inner ring 80, 180 Lock nut for outer ring 81, 181 Male thread of lock nut for outer ring 82, 182 Hole 122 Outer case 128 Lower casing flange 129 O-ring

Claims (5)

A valve comprising a valve body that opens and closes a fluid flow path provided in a body, an actuator that moves the valve body, and a casing that houses the actuator,
The actuator includes a drive device including a rotating drive shaft, a shaft having a large diameter portion that moves the valve body by converting rotational motion of the drive shaft into linear motion, and a shaft that connects the drive shaft and the shaft. comprising a coupling for connection and a bearing for suppressing axial wobbling of the shaft,
The inner ring of the bearing is placed on the upper surface of the large diameter portion, and the shaft includes an inner ring locking means that presses the upper surface of the inner ring in the direction of the large diameter portion to lock the inner ring to the shaft. arranged,
The valve is provided with an outer ring locking means for pressing the upper surface of the outer ring of the bearing downward to lock the outer ring to the casing. 2. The valve according to claim 1, wherein the inner wall of the casing is provided with an inner protrusion that supports a lower surface of the outer ring. 2. The inner ring locking means is an annular lock nut for the inner ring, the inner ring having a female thread carved on its inner surface that engages with a male thread carved on the outer circumferential surface of the shaft. Valve described in 1. Claim 1: The outer ring locking means is an annular lock nut for the outer ring, the outer ring lock nut having a male thread carved on its outer surface that engages with a female thread carved on the inner surface of the casing. Valve described in. The shaft includes a ball screw, a ball screw shaft of the ball screw closer to the drive shaft than the large diameter portion is connected to the drive shaft by the coupling, and a ball nut is closer to the valve body than the large diameter portion. The valve according to any one of claims 1 to 4, wherein a valve body connected to the ball nut moves linearly in conjunction with rotation of the ball screw shaft.

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