JP2020133678A - Motor-operated valve - Google Patents

Abstract

To improve assemblability of a motor-operated valve.SOLUTION: A motor-operated valve 100 comprises a screw feed mechanism, and a stopper mechanism. The screw feed mechanism is provided on a body 200 in a standing condition, and includes: a guide portion with a male screw portion 244 on its outer circumferential surface; and a guided portion composed of a cylindrical body constituting a rotating shaft 326 of a rotor 320, and comprising a female screw portion 328 threadedly engaged with the male screw portion 244 on an inner circumferential surface, and supported in a manner of being externally inserted to the guide portion. The stopper mechanism includes a projecting portion provided on an outer circumferential surface of the guide portion, and a stopper member 500 detachably assembled to the guided portion, and having a stopper projecting to a radial inner side with respect to an inner circumferential surface of the guided portion. When a valve element 204 is displaced in a valve opening direction by driving of a motor, the stopper is locked in a rotating direction of the rotor 320 by the projecting portion, thus translation motion of the rotor 320 is restricted.SELECTED DRAWING: Figure 1

Description

The present invention relates to an electric valve.

An automobile air conditioner is generally configured by arranging a compressor, a condenser, an inflator, an evaporator, and the like in a refrigeration cycle. As the expansion device, an electric expansion valve that realizes precise control of the valve opening degree by using a stepping motor for the drive unit is being adopted. Such an electric expansion valve has a mechanism for attaching and detaching a valve body supported at the tip of the shaft to a valve seat provided on the body. At the time of this attachment / detachment, a technique has been proposed in which a screw feed mechanism is adopted to convert the rotational motion of the rotor into the translational motion of the shaft.

Such an electric expansion valve is provided with a stopper mechanism in order to regulate the translational motion of the shaft. Conventionally, there is known an electric expansion valve that exerts a stopper function by locking a stopper portion that is integrally displaced with the rotation shaft of the rotor and a stopper portion provided on the body in the rotation direction of the rotor (see, for example, Patent Document 1). ).

Japanese Unexamined Patent Publication No. 10-47517

By the way, when assembling the electric expansion valve, it is necessary to insert a part of the shaft or the body inside the rotor. However, when the stopper is preliminarily fitted to the rotating shaft or body of the rotor and then the rotating shaft and body are assembled, the stoppers may interfere with each other. In order to complete the assembly while avoiding interference, it takes time and effort to assemble while considering the positional relationship of the stoppers, which may complicate the assembly.

The present invention has been made in view of such a problem, and one of the objects thereof is to improve the assembling property of the motorized valve.

The electric valve of the present invention includes a body having an introduction port for introducing a fluid from the upstream side, a take-out port for drawing out the fluid to the downstream side, and a valve seat provided in a passage for communicating the introduction port and the out-out port. A valve body that can be attached to and detached from the valve seat to open and close the valve, a motor that includes a rotor for driving the valve body in the opening and closing direction of the valve, and a shaft that is coaxially supported by the rotor and has the valve body integrally. , A screw feed mechanism that converts the rotary motion of the rotor into a translational motion, and a stopper mechanism that regulates the translational motion of the rotor are provided. The screw feed mechanism consists of a guide portion that is erected on the body and slidably inserts the shaft, and has a male screw portion on the outer peripheral surface, and a tubular body that constitutes the rotation axis of the rotor, and has a male screw on the inner peripheral surface. A female threaded portion that is screwed with the portion is provided, and has a guided portion that is supported in a manner that is externally inserted into the guide portion. The stopper mechanism includes a protrusion provided on the outer peripheral surface of the guide portion, and a stopper member that is detachably assembled with the guided portion and has a stopper that protrudes radially inward from the inner peripheral surface of the guided portion. Including. The motorized valve of the present invention is characterized in that when the valve body is displaced in the valve opening direction by driving a motor, the translational motion of the rotor is regulated by locking the stopper in the rotation direction of the rotor by the protrusion. To do.

According to the present invention, it is possible to provide an electric valve having good assembling property.

FIG. 1 is a cross-sectional view showing the structure of the motorized valve according to the first embodiment. FIG. 2 is a cross-sectional view showing a valve open state of the motorized valve. FIG. 3 is a diagram showing the appearance of the stopper member. FIG. 4 is a partially enlarged view showing the vicinity of the stopper member when the stopper member is assembled to the rotating shaft. FIG. 5 is a diagram showing an operation process in which the motorized valve transitions from the closed state to the fully open state. FIG. 6 is a cross-sectional view showing the vicinity of the stopper member in a state where the stopper mechanism is operated. FIG. 7 is a cross-sectional view of the vicinity of the stopper member when the stopper member according to the comparative example is used for the motorized valve. FIG. 8 is a cross-sectional view of the motorized valve when the stopper member according to the second embodiment is used for the motorized valve. FIG. 9 is a diagram showing the appearance of the stopper member. FIG. 10 is a perspective view of the vicinity of the stopper member when the stopper member is used for the motorized valve. FIG. 11 is a cross-sectional view showing the vicinity of the stopper member in a state where the stopper mechanism is operated. FIG. 12 is a cross-sectional view showing the vicinity of the stopper member of the motor-operated valve according to the third embodiment. FIG. 13 is a diagram showing an operation process of attaching the rotating shaft and the guide member. FIG. 14 is a cross-sectional view showing the vicinity of the stopper member of the motor-operated valve according to the fourth embodiment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following description, for convenience, the positional relationship of each structure may be expressed with reference to the illustrated state. Further, with respect to the following embodiments and modifications thereof, substantially the same components are designated by the same reference numerals, and the description thereof will be omitted as appropriate.

[First Embodiment]
FIG. 1 is a cross-sectional view showing the structure of the motor-operated valve 100 according to the first embodiment.
The motor-operated valve 100 of the present embodiment is an electric expansion valve that functions as an expansion device, and is configured by assembling a body 200 and a motor unit 300. A valve portion 202 is provided inside the body 200.

On the side of the body 200, there are an introduction port 222 that introduces a high-temperature and high-pressure fluid from the condenser side, and a take-out port 224 that draws out the low-temperature and low-pressure fluid that has been throttled and expanded by the valve portion 202 toward the evaporator. It is provided.

The body 200 includes a bottomed tubular first body 220, a cylindrical second body 240, and a cylindrical third body 260. A second body 240 is arranged in the upper half of the first body 220. A third body 260 is arranged in the lower half of the second body 240. The third body 260 is located inside the first body 220. The valve portion 202 is housed inside the third body 260. A guide member 242 (guide portion) is erected in the center of the upper part of the second body 240. A male screw portion 244 is formed on the outer peripheral surface of the central portion of the guide member 242 in the axial direction. The lower end of the guide member 242 has a large diameter, and the large diameter portion 245 is coaxially fixed to the center of the upper portion of the second body 240. A shaft 246 extending from the rotor 320 of the motor unit 300 is inserted inside the second body 240. The lower end of the shaft 246 also serves as the valve body 204 constituting the valve portion 202. The guide member 242 slidably supports the shaft 246 in the axial direction by its inner peripheral surface, while the rotary shaft 326 (guided portion) of the rotor 320 is slidably supported by its outer peripheral surface.

An introduction port 222 is provided on one side of the first body 220, and a take-out port 224 is provided on the other side. The introduction port 222 introduces the fluid, and the outlet port 224 derives the fluid. The introduction port 222 and the outlet port 224 communicate with each other by an internal passage formed in the third body 260.

An inlet port 262 is provided on the side of the third body 260, and an outlet port 264 is provided on the bottom. The inlet port 262 communicates with the introduction port 222 and the exit port 264 communicates with the outlet port 224. The inlet port 262 and the outlet port 264 communicate with each other via the valve chamber 266. A valve hole 208 is provided inside the third body 260, and a valve seat 210 is formed by the upper end opening edge thereof. The opening degree of the valve portion 202 is adjusted by bringing the valve body 204 into contact with and separating from the valve seat 210.

Inside the valve chamber 266, an E-ring 212 is fitted under the shaft 246. A spring receiver 214 is provided above the E-ring 212. A spring receiver 248 is also provided below the guide member 242, and a spring 216 that urges the valve body 204 in the valve closing direction of the valve portion 202 is coaxial with the valve body 204 between the two spring receivers 214 and 248. It has been inserted. In the present embodiment, since the lower end portion of the shaft 246 also serves as the valve body 204, the spring 216 also urges the shaft 246 in the valve closing direction.

Next, the structure of the motor unit 300 will be described.
The motor unit 300 is configured as a three-phase stepping motor including a rotor 320 and a stator 340. The motor unit 300 has a bottomed cylindrical can 302, and the rotor 320 is arranged inside the can 302 and the stator 340 is arranged outside the can 302.

The stator 340 includes a laminated core 342 and a bobbin 344. The laminated core 342 is configured by laminating plate-shaped cores in the axial direction. A coil 346 is wound around the bobbin 344. The coil 346 and the bobbin 344 around which the coil 346 is wound are collectively referred to as a "coil unit 345". The coil unit 345 is assembled to the laminated core 342.

The stator 340 is integrally provided with the case 400 by molding. A lid 440 is in-row fitted to the upper end opening of the case 400. A printed wiring board 420 is arranged in the space S surrounded by the case 400 and the lid 440. The coil 346 is connected to the printed wiring board 420. The case 400 is provided with a terminal cover portion 402, which protects the terminal 422 for supplying electric power from an external power source to the printed wiring board 420.

An annular seal members 206 and 201 are interposed between the third body 260 and the first body 220 and between the second body 240 and the first body 220, respectively. This configuration prevents fluid from leaking through the clearance between the first body 220 and the third body 260 and the clearance between the second body 240 and the first body 220. Further, an annular seal member 203 is interposed between the second body 240 and the case 400. With this configuration, the intrusion of outside air (moisture, etc.) through the clearance between the second body 240 and the case 400 is prevented.

The rotor 320 includes a cylindrical rotor core 322 and a magnet 324 provided along the outer circumference of the rotor core 322. The rotor core 322 is assembled to the rotating shaft 326. The magnet 324 is magnetized to a plurality of poles in its circumferential direction.

The rotating shaft 326 is a bottomed cylindrical cylindrical shaft, and is extrapolated to the guide member 242 with its opening end facing down. A female threaded portion 328 is formed on the inner peripheral surface of the rotating shaft 326 and meshes with the male threaded portion 244 of the guide member 242. The screw feed mechanism by these screw portions converts the rotational motion of the rotor 320 into a translational motion in the axial direction. Details of the structure near the opening end of the rotating shaft 326 will be described later.

The upper portion of the shaft 246 is reduced in diameter, and the reduced diameter portion penetrates the bottom portion of the rotating shaft 326. An annular stopper 330 is fixed to the tip of the reduced diameter portion. On the other hand, a back spring 332 that urges the shaft 246 downward (in the valve closing direction) is interposed between the base end of the reduced diameter portion and the bottom portion of the rotating shaft 326. With such a configuration, when the valve portion 202 is opened, the shaft 246 is integrally displaced with the rotor 320 in such a manner that the stopper 330 is locked to the bottom portion of the rotating shaft 326. On the other hand, when the valve portion 202 is closed, the back spring 332 is compressed by the reaction force received by the valve body 204 from the valve seat 210. The elastic reaction force of the back spring 332 at this time can press the valve body 204 against the valve seat 210, and the seating performance (valve closing performance) of the valve body 204 can be improved.

FIG. 2 is a cross-sectional view showing a fully opened state of the motorized valve 100.
The motorized valve 100 has a stopper mechanism that regulates the translational motion of the rotating shaft 326. The stopper mechanism includes a protrusion provided at the open end of the rotating shaft 326, two protrusions provided on the outer peripheral surface of the guide member 242, and a stopper member 500.
The rotating shaft 326 has a diameter-expanded portion 334 whose inner diameter is expanded at the lower portion. The enlarged diameter portion 334 extends from directly below the female screw portion 328 to the lower end of the rotating shaft 326. The open end of the rotating shaft 326 projects downward of the rotor 320, and an annular recess 336 is provided along the outer peripheral surface thereof. A stopper member 500 is fitted in the recess 336.

On the outer peripheral surface of the guide member 242, the first protrusion 250 is projected slightly below the male screw portion 244. A second protrusion 252 is provided below the first protrusion 250. The first protrusion 250 is provided so as to project outward in the radial direction from the outer peripheral surface of the guide member 242. The height of the first protrusion 250 is set lower than the height of the second protrusion 252. In the first embodiment, the second protrusion 252 forms the upper end portion of the large diameter portion 245. The first protrusion 250 defines the top dead center in the translational motion of the rotation shaft 326, and the second protrusion 252 defines the bottom dead center.

When the screw feed mechanism is operated by driving the motor unit 300 and the rotating shaft 326 starts to move upward, the shaft 246 is integrally displaced with the rotor 320. Due to this displacement, the valve body 204 is separated from the valve seat 210. As a result, the fluid introduced into the introduction port 222, the inlet port 262, and the valve chamber 266 passes through the outlet port 264 and the outlet port 224 in this order and flows out.

As shown in FIG. 1, in the valve closed state, a part of the open end portion of the rotating shaft 326 comes into contact with the upper end portion (second protrusion 252 in FIG. 2) of the large diameter portion 245. On the other hand, as shown in FIG. 2, a part of the stopper member 500 comes into contact with the first protrusion 250 in the fully open state. These two contact modes regulate the translational motion of the rotary shaft 326 downward (valve closing direction) and upward (valve opening direction). The details of the contact mode will be described later.

Next, the structure of the stopper member 500 will be described.
FIG. 3 is a diagram showing the appearance of the stopper member 500. 3 (A) is a side view, FIG. 3 (B) is a bottom view, and FIG. 3 (C) is a perspective view.

The stopper member 500 is made of a spring material. The stopper member 500 is obtained by bending a strip-shaped portion obtained by punching a plate material and molding it into a clip shape. The stopper member 500 includes an arc-shaped fitting portion 502, a U-shaped connecting portion 504 in a plan view, and a guide portion 505. In the stopper member 500, the fitting portion 502 extends from both ends of the connecting portion 504, and the guide portion 505 extends from the end portion of the fitting portion 502 opposite to the connecting portion 504. The stopper member 500 has a substantially symmetrical structure with respect to the bisector L of the connecting portion 504 (excluding the protrusion 508 described later).

The fitting portion 502 is composed of two arc-shaped fitting members 503. The two fitting members 503 are arranged at symmetrical positions with respect to the bisector L. The two fitting members 503 have the same inscribed circle. The curvature of the inscribed circle of the fitting portion 502 (the inscribed circle of the fitting member 503) is equal to the curvature at the bottom of the recess 336. The guide portion 505 is composed of two guide members 507. These guide members 507 have a shape that extends in a direction close to each other from a connection point with the fitting member 503 and extends in a direction in which they are separated from each other on the way. The portion of the guide portion 505 where the two guide members 507 have the shortest distance (the portion that changes from the proximity direction to the separation direction) is referred to as "narrow portion N".

The stopper member 500 further includes a protrusion 506. The protruding portion 506 has an L-shape in a side view, protrudes downward from the connecting portion 504, and further extends in the direction of the center axis of the inscribed circle of the fitting portion 502. The extending direction of the protrusion 506 is the same as that of the bisector L. The tip of the protrusion 506 has a tapered shape. Further, the end face of the tip portion of the protruding portion 506 has a curvature. The protrusion 506 is provided with a protrusion 508 on the side surface of the tip. The protrusion 508 extends in the circumferential direction from the protrusion 506.

FIG. 4 is a partially enlarged view showing the vicinity of the stopper member 500 when the stopper member 500 is assembled to the rotating shaft 326.
The lower end of the rotating shaft 326 has a stepped shape. The step includes a step 338 and a protrusion 327. The step portion 338 is formed in a concave shape from the lower end surface of the rotating shaft 326. The step portion 338 extends in the rotation direction of the rotation shaft 326 (circumferential direction of the rotation shaft 326). A protrusion 506 is inserted through the step portion 338 in the radial direction. The protruding portion 506 is movable only within the range of the step portion 338 in the rotation direction. The protrusion 327 is formed in a convex shape from the lower end surface of the rotating shaft 326. The protrusion 327 sandwiches the protrusion 506 with the first protrusion 250. That is, in the protrusion 327, the portion facing the protrusion 506 functions as a “holding portion”. Further, the portion on the opposite side functions as a "locking portion" with the second protrusion 252 (details will be described later).

The stopper member 500 is assembled to the rotating shaft 326 with the protruding portion 506 positioned below the fitting portion 502. The fitting portion 502 is fitted into the recess 336.

There is a gap between the inner peripheral surface of the enlarged diameter portion 334 and the outer peripheral surface of the guide member 242. The tip of the protrusion 506 is located in this gap. That is, the protruding portion 506 protrudes inward in the radial direction from the inner peripheral surface of the rotating shaft 326. Further, a clearance is provided between the tip surface of the protrusion 506 and the outer peripheral surface of the guide member 242. Therefore, the stopper member 500 is movable around the guide member 242 in the rotation direction of the rotation shaft 326.

At some point in the translational motion of the rotation shaft 326 (details will be described later), the protrusion 506 is locked by the first protrusion 250 in the rotation direction of the rotation shaft 326. At this time, the protrusion 327 (functioning as a "holding portion") abuts on the surface of the protrusion 506 opposite to the surface with which the first protrusion 250 abuts. The protrusion 327 presses the protrusion 506 in the rotation direction of the rotation shaft 326 and sandwiches it between the protrusion 327 and the first protrusion 250.

A protrusion 508 is inserted between the inner peripheral surface of the protrusion 327 and the outer peripheral surface of the guide member 242. That is, the protrusion 508 is sandwiched in the radial direction by the inner peripheral surface of the protrusion 327 and the outer peripheral surface of the guide member 242. With this structure, even when the stopper member 500 receives a force outward in the radial direction, the protrusion 508 abuts on the inner peripheral surface of the protrusion 327 and stays inside the protrusion 327. Can be done. Therefore, the stopper member 500 does not fall off from the rotating shaft 326. The protrusion 508 can also be said to be a "hooking portion" for preventing the stopper member 500 from falling off the rotating shaft 326.

Here, a method of assembling the rotating shaft 326, the guide member 242, and the stopper member 500 will be described with reference to FIG.
First, the tip of the guide member 242 is inserted inside the rotating shaft 326. The male threaded portion 244 and the female threaded portion 328 are screwed together (see FIG. 1), and the guide member 242 is inserted into the rotating shaft 326. There is a gap between the first protrusion 250 and the enlarged diameter portion 334. Due to the presence of this gap, the first protrusion 250 can be inserted inward of the enlarged diameter portion 334. After the first protrusion 250 is inserted above the step portion 338, the stopper member 500 is fitted to the rotating shaft 326 in the radial direction. At that time, first, the end portion of the guide portion 505 is applied to the bottom portion of the recess 336, and the guide portion 505 and the fitting portion 502 are sequentially fitted along the recess 336. The narrow portion N of the guide portion 505 extends along the bottom portion of the recess 336 and gets over the bottom portion. When the narrow portion N passes through the bottom of the recess 336, the expansion of the narrow portion N is eliminated by the spring force. The bottom of the recess 336 is fitted to a position concentric with the fitting portion 502, and the fitting of the fitting portion 502 into the recess 336 is completed. A protrusion 506 is inserted through the step portion 338. The protrusion 508 is inserted between the protrusion 327 and the guide member 242, and the protrusion 506 is sandwiched between the protrusion 327 and the first protrusion 250. In this way, the assembly of the rotating shaft 326, the guide member 242, and the stopper member 500 is completed.

When assembling the rotating shaft 326 and the guide member 242, it is necessary to insert the first protrusion 250 inward of the rotating shaft 326. Therefore, the inner diameter of the rotating shaft 326 (inner diameter of the enlarged diameter portion 334) is set to be larger than the diameter of the circumscribed circle of the first protrusion 250 centered on the axis of the guide member 242. On the other hand, in order to regulate the translational movement of the rotary shaft 326 upward (valve opening direction) by using the first protrusion 250, the first protrusion 250 and the rotary shaft 326 rotate at any part. Must abut in the direction. In the present embodiment, the rotating shaft 326 and the guide member 242 are assembled, the first protrusion 250 is inserted inside the rotating shaft 326, and then the stopper member 500 that functions as a stopper is assembled. The stopper projects inward in the radial direction from the inner diameter of the rotating shaft 326. With this structure, the rotating shaft 326 and the guide member 242 can be smoothly assembled. In addition, the stopper mechanism functions when the valve is opened. Therefore, the assembling property of the motor-operated valve 100 having the stopper mechanism can be improved.

When assembling the stopper member 500, the fitting portion 502 can be smoothly fitted into the recess 336 by providing the guide portion 505. Further, since the tip of the protruding portion 506 has a tapered shape, the protruding portion 506 can be smoothly inserted into the step portion 338.

FIG. 5 is a diagram showing an operation process in which the motorized valve 100 transitions from the closed state to the fully open state. 5 (A) shows the valve closed state, FIG. 5 (B) shows the state slightly opened from the valve closed state, FIG. 5 (C) shows the state slightly closed from the fully open state, and FIG. 5 (D) shows the fully open state. Represent.
FIG. 6 is a cross-sectional view showing a state in which the vicinity of the stopper member 500 is viewed from below when the stopper mechanism is operated. FIG. 6A shows a valve closed state, and FIG. 6B shows a fully open state.

The operation near the stopper member 500 will be described.
When the valve portion 202 is in the closed state, the positional relationship between the rotary shaft 326, the guide member 242, and the stopper member 500 is as shown in FIGS. 5 (A) and 6 (A). That is, the second protrusion 252 and the protrusion 327 (functioning as a "locking portion") come into contact with each other in the rotation direction of the rotation shaft 326, so that the downward movement of the rotation shaft 326 is restricted. In the process of opening the valve portion 202 (see FIG. 1) (FIGS. 5 (B) and 5 (C)), the second protrusion 252 and the protrusion 327 are separated from each other, and the rotation shaft 326 can be moved in the axial direction. It becomes. When the valve portion 202 is fully opened (FIGS. 5 (D) and 6 (B)), the first protrusion 250 and the protrusion 506 come into contact with each other, and the upward movement of the rotating shaft 326 is restricted. During the translational movement of the rotating shaft 326 from the closed state of the valve portion 202 to the fully opened state, the protruding portion 327 and the protruding portion 506 move together.

As described above, according to the first embodiment, the stopper member 500 is assembled after the rotating shaft 326 and the guide member 242 are assembled. The inner diameter of the enlarged diameter portion 334 is larger than the diameter of the circumscribed circle of the first protrusion 250 centered on the axis of the guide member 242. Further, the enlarged diameter portion 334 extends to the lower end of the rotating shaft 326. As a result, the rotating shaft 325 can be smoothly extrapolated to the guide member 242. Further, the protruding portion 506 protrudes inward in the radial direction from the inner peripheral surface of the rotating shaft 325. As a result, the first protrusion 250 and the protrusion 506 can come into contact with each other in the rotation direction of the rotation shaft 326 when the valve is opened. Therefore, the translational motion of the rotary shaft 326 in the valve opening direction during the valve opening operation can be regulated.

According to the first embodiment, in the valve closed state, the first protrusion 250 is located inside the rotating shaft 326. Further, when transitioning from the valve closed state to the fully open state, the first protrusion 250 relatively displaces the inner side of the rotating shaft 326 so as to approach the lower end (opening end) of the rotating shaft 326. Then, in the fully open state, the position of the first protrusion 250 is the position where the protrusion 506 is locked. That is, a part of the stroke position of the first protrusion 250 accompanying the valve opening operation (valve closing operation) is included in the inside of the rotating shaft 326. Therefore, the length of the motorized valve 100 in the axial direction can be shortened.

FIG. 7 is a cross-sectional view of the vicinity of the stopper member 600 as viewed from below when the stopper member 600 according to the comparative example is used for the motorized valve 100. FIG. 7A is a diagram showing a state in which the stopper member 600 is correctly fitted to the rotating shaft 326. FIG. 7B is a diagram showing a state in which the stopper member 600 is about to fall out of the rotating shaft 326.
In FIGS. 7A and 7B, solid arrows indicate the rotation direction of the rotation shaft 326 when the valve is opened. The dotted arrow indicates the moving direction of the stopper member 600.

In the stopper member 600, a portion corresponding to the protrusion 508 (see FIG. 3) of the stopper member 500 is not provided at the tip of the protrusion 506. In the fully open state, the protrusion 506 is locked by the first protrusion 250 in the rotation direction of the rotation shaft 326. The protrusion 327 abuts on the protrusion 506 in a manner in which the protrusion 506 is sandwiched between the protrusion 327 and the first protrusion 250. Even after the fully opened state, the rotation shaft 326 tries to rotate in the rotation direction (direction indicated by the solid arrow in FIGS. 7A and 7B) when the valve is opened by driving the motor unit 300. The rotational force of the rotating shaft 326 is the force with which the protrusion 327 pushes the protrusion 506 against the first protrusion 250. The tip of the protrusion 506 has a tapered shape. Therefore, due to the pressing force received from the protrusion 327 and the reaction force received from the first protrusion 250, the protrusion 506 is pushed outward in the radial direction (the direction indicated by the dotted arrow in FIGS. 7A and 7B). Receive power. Due to this pushing force, the stopper member 600 falls off from the rotating shaft 326. When the spring force of the stopper member 600 is large, the fitting portion 502 can stay in the recess 336. When the spring force of the stopper member 600 is large, the hooking portion may not be provided as in the stopper member 600.

[Second Embodiment]
In the second embodiment, the shape of the stopper member 700 is different from that in the first embodiment. Hereinafter, the differences from the first embodiment will be mainly described.
FIG. 8 is a cross-sectional view of the motor-operated valve 100 when the stopper member 700 according to the second embodiment is used for the motor-operated valve 100. FIG. 8A shows a valve closed state, and FIG. 8B shows a fully open state.

A recess 337 is provided on the outer peripheral surface of the opening end of the rotating shaft 326. The stopper member 700 fits into the recess 337 and is fitted to the open end of the rotating shaft 326. The structure of the stopper member 700 will be described in detail later.

In the valve closed state, the protrusion 327 is locked by the second protrusion 252 in the rotation direction of the rotation shaft 326. This structure restricts the movement of the rotary shaft 326 in the valve closing direction (downward direction). In the fully open state, the protruding portion 706 (described later) of the stopper member 700 and the first protruding portion 250 come into contact with each other in the rotation direction of the rotating shaft 326. This structure restricts the movement of the rotary shaft 326 in the valve opening direction (upward direction).

FIG. 9 is a diagram showing the appearance of the stopper member 700. 9 (A) is a side view, FIG. 9 (B) is a perspective view, and FIG. 9 (C) is a plan view.
The stopper member 700 has a square plate-shaped fitting portion 702a, 702b, 702c (collectively referred to as “fitting portion 702”), a disk-shaped connecting portion 704, and a square plate-shaped protruding portion 706. The fitting portion 702 has a plate-shaped fitting end portion 708 and a plate-shaped cross-linking portion 710. The fitting end portion 708 is arranged parallel to the connecting portion 704. The cross-linking portion 710 bridges the fitting end portion 708 and the inner peripheral surface of the connecting portion 704, and connects the fitting end portion 708 to the connecting portion 704. The fitting portion 702 extends from the inner peripheral surface of the connecting portion 704 in the direction toward the center of the inscribed circle of the connecting portion 704. Three fitting portions 702 are arranged in the circumferential direction at intervals of 120 degrees. The connecting portion 704 connects the fitting portion 702 and the protruding portion 706. The protruding portion 706 has a plate-shaped stopper portion 712 and a plate-shaped cross-linked portion 714. The stopper portion 712 is arranged in parallel with the connecting portion 704. The cross-linking portion 714 bridges the stopper portion 712 and the inner peripheral surface of the connecting portion 704. The height of the connecting portion 704 and the stopper portion 712 is larger than the height of the connecting portion 704 and the fitting end portion 708. The protrusion 706 extends from the inner peripheral surface of the connecting portion 704 toward the center of the inscribed circle of the connecting portion 704. The protruding portion 706 is provided at a distance of 180 degrees from the fitting portion 702b.

FIG. 10 is a perspective view of the vicinity of the stopper member 700 when the stopper member 700 is used for the motorized valve 100. FIG. 10A shows a valve closed state, and FIG. 10B shows a fully open state.
FIG. 11 is a cross-sectional view of the vicinity of the stopper member 700 in a state where the stopper mechanism is operated, as viewed from below. FIG. 11 (A) shows the valve closed state, and FIG. 11 (B) shows the fully open state.
As shown in FIGS. 10A and 11A, in the valve closed state, the protrusion 327 is sandwiched between the second protrusion 252 and the protrusion 706. That is, the protrusion 327 (locking portion) is locked by the second protrusion 252 in the rotation direction of the rotation shaft 326. With this configuration, the movement of the rotating shaft 326 in the valve closing direction is restricted. Further, as shown in FIGS. 10 (B) and 11 (B), the protruding portion 706 is sandwiched between the first protrusion 250 and the protrusion 327 (holding portion) in the fully opened state. That is, the protrusion 706 is locked by the first protrusion 250 in the rotation direction of the rotation shaft 326. With this configuration, the movement of the rotary shaft 326 in the valve opening direction is restricted.

As shown in FIGS. 11A and 11B, in the stopper member 700, the fitting portion 702b and the protruding portion 706 are provided at intervals of 180 degrees. As a result, in the fully open state, the fitting portion 702b is pressed against the rotating shaft 326 even if a force acts on the protruding portion 706 in the direction away from the rotating shaft 326. Therefore, the stopper member 700 does not come off from the rotating shaft 326.

[Third Embodiment]
In the third embodiment, the structure of the rotating shaft 326 is different from that in the first embodiment. Hereinafter, the differences from the first embodiment will be mainly described.
FIG. 12 is a cross-sectional view showing the vicinity of the stopper member 500 of the motor-operated valve 100 in the third embodiment. FIG. 12 (A) shows the valve closed state, and FIG. 12 (B) shows the fully open state.
FIG. 13 is a diagram showing an operation process of assembling the rotating shaft 326 and the guide member 242. 13 (A)-(E) are cross-sectional views of the vicinity of the stopper member 500 viewed from below, and show each time point of the operation process in order. The solid line arrows in FIGS. 13A to 13E indicate the rotation direction of the rotation shaft 326 at the time of assembly. The dotted arrow indicates the moving direction of the stopper member 500.

As shown in FIGS. 12A and 12B, in the third embodiment, the diameter-expanded portion 335 of the rotating shaft 326 has a larger diameter than the diameter-expanded portion 334 of the first embodiment. The assembly of the rotating shaft 326 and the guide member 242 in the third embodiment is performed after the stopper member 500 is fitted to the rotating shaft 326 in advance. At the time of this assembly, it is necessary to prevent the stopper member 500 and the male screw portion 244 from interfering with each other. Therefore, in the third embodiment, the enlarged diameter portion 335 has a large diameter so that the stopper member 500 does not hit the male screw portion 244.

As shown in FIGS. 13 (A) to 13 (E), the slope portion 254 is provided on the surface of the first protrusion 250 opposite to the locking surface with the protruding portion 506. The slope portion 254 connects the outer peripheral surface of the guide member 242 and the peripheral edge portion of the first protrusion 250. The slope portion 254 is used when assembling the rotating shaft 326 and the guide member 242 in the third embodiment. Hereinafter, this assembly will be described with reference to FIGS. 13 (A)-(E).

A stopper member 500 is assembled in advance on the rotating shaft 326. First, the rotating shaft 326 is externally inserted into the guide member 242 until the lower end of the rotating shaft 326 (see FIG. 1) reaches the position of the first protrusion 250 (FIG. 13 (A)). As the extrapolation continues, the protrusion 508 abuts on the slope 254 (FIG. 13B). When the protrusion 508 abuts on the slope 254 and continues extrapolation, the protrusion 506 rides on the outer peripheral surface of the first protrusion 250 along the slope 254 (FIG. 13 (C)). When extrapolation is continued, the protrusion 506 gets over the first protrusion 250 (FIG. 13 (D)). Finally, when the rotation shaft 326 and the stopper member 500 are rotated in the direction opposite to the direction in which the guide member 242 is extrapolated, the protrusion 327 and the protrusion 506 come into contact with each other in the rotation direction. The protrusion 506 is sandwiched between the protrusion 327 (holding portion) and the first protrusion 250 (FIG. 13 (E)).

As described in relation to FIG. 4, in the first embodiment, the stopper member 500 is assembled after the rotating shaft 326 and the guide member 242 are assembled. In the third embodiment, by providing the slope portion 254, the rotating shaft 326 and the guide member 242 can be assembled while the stopper member 500 is previously attached to the rotating shaft 326. Therefore, the assembling property of the motorized valve 100 can be improved.

[Fourth Embodiment]
In the fourth embodiment, the position of the second protrusion 350 is different from that in the first embodiment. Hereinafter, the differences from the first embodiment will be mainly described.
FIG. 14 is a cross-sectional view showing the vicinity of the stopper member 500 of the motor-operated valve 100 according to the fourth embodiment. FIG. 14A shows a valve closed state, and FIG. 14B shows a fully open state.

In the fourth embodiment, the base end of the enlarged diameter portion 334 is a stepped protrusion. In the fourth embodiment, the protruding portion 506 is the first protruding portion 348, and the protruding portion at the base end of the enlarged diameter portion 334 is the second protruding portion 350. As shown in FIG. 14A, in the valve closed state, the second protrusion 350 and the first protrusion 250 of the guide member 242 come into contact with each other in the rotation direction of the rotation shaft 325. As a result, when the valve is closed, the translational motion of the rotary shaft 325 in the valve closing direction is restricted. Further, as shown in FIG. 14B, in the fully open state, the first protrusion 348 and the first protrusion 250 of the guide member 242 come into contact with each other in the rotational direction. As a result, the translational motion of the rotary shaft 325 in the valve opening direction is restricted during the valve opening operation. With this configuration, the translational motion of the rotating shaft 325 can be appropriately regulated.

Although the preferred embodiment of the present invention has been described above, the present invention is not limited to the specific embodiment, and it goes without saying that various modifications can be made within the scope of the technical idea of the present invention. Nor.

In the above embodiment, a step portion is provided at the lower end of the rotating shaft. In the modified example, the structure may be such that the protruding portion of the stopper member can be provided radially inward from the inner peripheral surface of the rotating shaft. For example, a hole through which the protruding portion is inserted in the radial direction may be provided at the open end of the rotating shaft. Further, holes may be provided in other parts of the rotating shaft according to the position of the stopper member in the axial direction.

In the above embodiment, the translational motion of the rotating shaft is regulated by the contact between the protrusion and the second protrusion. In the modified example, a portion of the open end portion of the rotating shaft other than the protruding portion may come into contact with the second protruding portion in the rotational direction of the rotor. Even in this case, the movement of the rotation axis in the axial direction can be regulated.

In the above embodiment, the protrusion is radially sandwiched between the protrusion and the guide member. In the modified example, a protrusion may be inserted between a guide member and a portion of the open end of the rotating shaft that is different from the holding portion. Even in this case, it is possible to prevent the stopper member from falling off from the rotating shaft.

In the above embodiment, the motorized valve in which the valve body is attached to and detached from the valve seat and the valve portion is completely closed in the closed state has been described. In the modified example, the valve body may be inserted into and removed from the valve hole like a so-called spool valve to allow minute leakage of fluid in the valve closed state.

In the above embodiment, the mode in which the valve body and the shaft are integrally molded has been described. In the modified example, the present invention is not limited to this, and the valve body and the shaft may be separate members and may be integrally displaceable. In this case, the valve body and the shaft may be structurally integrated. Alternatively, the valve body and the shaft may be integrally displaceable and may be relatively displaceable. For example, as in the motorized valve described in Japanese Patent Application Laid-Open No. 2016-205584, the valve body and the shaft may be integrally displaceable when the valve is opened, and may be relatively displaceable when the valve is closed. ..

The present invention is not limited to the above-described embodiment or modification, and the components can be modified and embodied without departing from the gist. Various inventions may be formed by appropriately combining a plurality of components disclosed in the above embodiments and modifications. In addition, some components may be deleted from all the components shown in the above embodiments and modifications.

100 electric valve, 200 body, 202 valve part, 203 seal member, 204 valve body, 206 seal member, 208 valve hole, 210 valve seat, 212 E-ring, 214 spring receiver, 216 spring, 220 first body, 222 introduction port , 224 Derivation port, 240 2nd body, 242 guide member, 244 male thread part, 245 large diameter part, 246 shaft, 248 spring receiver, 250 1st protrusion, 252 2nd protrusion, 254 slope part, 260 3rd body , 262 inlet port, 264 outlet port, 266 valve chamber, 300 motor unit, 302 can, 320 rotor, 322 rotor core, 324 magnet, 325 rotating shaft, 326 rotating shaft, 327 protrusion, 328 female thread, 330 stopper, 332 back Spring, 334 diameter expansion part, 335 diameter expansion part, 336 recess, 337 recess, 338 step part, 340 stator, 342 laminated core, 344 bobbin, 345 coil unit, 346 coil, 348 first protrusion, 350 second protrusion , 400 case, 402 terminal cover, 420 printed wiring board, 422 terminal, 440 lid, 500 stopper member, 502 fitting part, 503 fitting member, 504 connecting part, 505 guide part, 506 protruding part, 507 guide member , 508 protrusion, 600 stopper member, 700 stopper member, 702 fitting part, 704 connecting part, 706 protruding part, 708 fitting end part, 710 bridge part, 712 stopper part, 714 bridge part, L bisector, N narrow part, S space.

Claims (11)

An introduction port for introducing a fluid from the upstream side, a derivation port for deriving the fluid to the downstream side, and a body provided with a passage for communicating the introduction port and the derivation port.
A valve body that opens and closes the valve portion provided in the passage, and
A motor including a rotor for driving the valve body in the opening / closing direction of the valve portion, and
A shaft coaxially supported by the rotor and displaceable integrally with the valve body,
A screw feed mechanism that converts the rotary motion of the rotor into a translational motion,
A stopper mechanism that regulates the translational motion of the rotor and
With
The screw feed mechanism is
A guide portion that is erected on the body, slidably inserts the shaft, and has a male screw portion on the outer peripheral surface.
A guided portion formed of a tubular body constituting the rotation shaft of the rotor, provided with a female screw portion screwed with the male screw portion on the inner peripheral surface, and supported in a manner of being externally inserted into the guide portion.
Have,
The stopper mechanism
A protrusion provided on the outer peripheral surface of the guide portion and a protrusion
A stopper member that is detachably assembled from the guided portion and has a stopper that protrudes radially inward from the inner peripheral surface of the guided portion.
Including
When the valve body is displaced in the valve opening direction by the drive of the motor, the stopper is locked in the rotation direction of the rotor by the protrusion, so that the translational motion of the rotor is regulated. Electric valve. The guided portion is provided with a diameter-expanded portion at a position separated from the female screw portion.
The enlarged diameter portion has an inner diameter larger than the circumscribed circle of the protruding portion centered on the axis of the guide portion, and is opened to the side of the body.
The electric valve according to claim 1, wherein the protrusion is located inside the enlarged diameter portion when the valve portion is in the closed state. A recess is formed on the outer peripheral surface of the guided portion.
The motorized valve according to claim 1 or 2, wherein the stopper member is fitted in the recess. The stopper member is
A fitting portion that fits into the recess and
A connecting portion that is connected to the fitting portion and extends outward in the radial direction of the guided portion,
A protruding portion extending inward in the radial direction from the connecting portion toward the opening end of the guided portion and projecting inward from the inner peripheral surface of the guided portion.
Including
The motorized valve according to claim 3, wherein the protruding portion forms the stopper. The stopper member is characterized by having a protrusion extending in the rotational direction from the side surface of the protrusion and being sandwiched in the radial direction by an outer peripheral surface of the guide portion and an inner peripheral surface of the guided portion. 4. The electric valve according to 4. The guided portion includes a sandwiching portion that presses the stopper in the rotational direction and sandwiches the stopper with the protrusion when the stopper is locked to the protrusion. The electric valve according to any one of 5. The guide portion has a first protrusion as the protrusion and a second protrusion that is projected at a position closer to the body than the first protrusion.
When the first protrusion and the stopper come into contact with each other in the rotation direction of the rotor, one end of the translational motion of the rotor is restricted.
A 1-6 claim, wherein the other end of the translational motion of the rotor is regulated by abutting the second protrusion and the open end of the guided portion in the rotational direction of the rotor. The electric valve described in either. The guided portion has a first protruding portion as the stopper and a second protruding portion which is a base end of the enlarged diameter portion.
When the protrusion of the guide portion and the first protrusion come into contact with each other in the rotation direction of the rotor, one end of the translational motion of the rotor is restricted.
Any of claims 2-6, wherein the other end of the translational motion of the rotor is regulated by abutting the protrusion of the guide portion and the second protrusion in the rotation direction of the rotor. Electric valve described in Crab. A claim characterized in that the guide portion is provided with a slope portion that connects the peripheral edge portion of the protrusion portion and the outer peripheral surface of the guide portion on the side of the protrusion portion opposite to the locking surface of the stopper. Item 6. The electric valve according to any one of Items 1-8. The motorized valve according to any one of claims 1-9, wherein the stopper member is made of a spring material. The guided portion has a step portion or a hole portion through which the stopper is inserted in the radial direction.
The motorized valve according to any one of claims 1-10, wherein the step portion or the hole portion regulates a movable range in the circumferential direction of the stopper.

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