JP2020204344A - Electric valve - Google Patents

Abstract

To provide an electric valve with good assembling property.SOLUTION: An electric valve comprises a screw feeding mechanism and a stopper mechanism. The screw feeding mechanism includes a guide portion provided with a male screw portion 244 on an outer peripheral surface, and a cylindrical guided portion that is a rotary shaft 326 of a rotor and is provided with a female screw portion 328 to be screwed with the male screw portion 244 on an inner peripheral surface. The stopper mechanism includes a stopper portion provided on the guided portion, and a locking surface integrally molded with the guide portion. When a valve body is displaced in a valve closing direction by the driving of a motor, the locking surface locks with the stopper portion, thereby regulating the movement in the valve closing direction of the rotor.SELECTED DRAWING: Figure 7

Description

The present invention relates to an electric valve, and more particularly to a configuration of a stopper mechanism that regulates translational motion of the rotor.

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. For 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 (for example, Patent Document 1). reference).

Japanese Unexamined Patent Publication No. 10-47517

By the way, when assembling the electric expansion valve, assembling accuracy is required. However, when the stopper portion is formed by using the stopper member which is a member different from the body as in Patent Document 1, the stopper portion must be assembled while considering the positional relationship of the stopper portion. With such a configuration, there is a risk that assembly will be complicated.

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.

One aspect of the present invention is a motorized valve. This motorized valve has an inlet port for introducing fluid from the upstream side, an outlet port for guiding fluid to the downstream side, a body provided with a passage for communicating the inlet port and the outlet port, and a valve portion provided in the passage. A valve body that opens and closes, a motor that includes a rotor that drives the valve body in the opening and closing direction of the valve, a screw feed mechanism that converts the rotary motion of the rotor into translational motion, and a stopper mechanism that regulates the translational motion of the rotor. , Equipped with. The screw feed mechanism consists of a guide portion that is erected on the body 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 female screw portion that is screwed with the male screw portion on the inner peripheral surface. It has a guided portion, which is supported by being externally attached to the guide portion. The stopper mechanism includes a stopper portion provided on the guided portion and a locking surface integrally molded on the guide portion. When the valve body is displaced in the valve closing direction by the drive of the motor, the locking surface locks the stopper portion, thereby restricting the movement of the rotor in the valve closing direction.

According to this aspect, since the locking surface constituting the stopper portion is integrally formed with the guide portion, the step of assembling the locking surface and the guide portion becomes unnecessary. Therefore, the assembling property of the motorized valve can be improved.

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 diagram showing the structure of the guide member and the rotating shaft. FIG. 8 is a diagram showing a state in which the second stopper portion is locked to the second locking surface (when the valve is closed). FIG. 9 is a diagram showing a state in which the second stopper portion is rotated by 150 degrees from the valve closed state. FIG. 10 is a diagram showing a state in which the second stopper portion is rotated by 300 degrees from the valve closed state. FIG. 11 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. 12 is a cross-sectional view of the motor-operated valve when the stopper member according to the second embodiment is used for the motor-operated valve. FIG. 13 is a diagram showing the appearance of the stopper member. FIG. 14 is a perspective view of the vicinity of the stopper member when the stopper member is used for the motorized valve. FIG. 15 is a cross-sectional view showing the vicinity of the stopper member in a state where the stopper mechanism is operated. FIG. 16 is a cross-sectional view showing the vicinity of the stopper member of the motor-operated valve according to the third embodiment. FIG. 17 is a diagram showing an operation process of attaching the rotating shaft and the guide member. FIG. 18 is a cross-sectional view showing the vicinity of the stopper member of the motor-operated valve according to the fourth embodiment. FIG. 19 is a partially enlarged cross-sectional view showing the vicinity of the stopper mechanism of the motor-operated valve according to the fifth embodiment. FIG. 20 is a conceptual diagram showing a molding process of the stopper portion.

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 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. The guide member 242 is a machined part made of a metal material, and a male screw portion 244 is formed on the outer peripheral surface of the central portion in the axial direction of the guide member 242. 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 machined product made of a metal material. The rotary shaft 326 is obtained by integrally molding a metal material into a bottomed cylindrical shape. The rotating shaft 326 is extrapolated to the guide member 242 with its open 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. The meshing portion between the female screw portion 328 and the male screw portion 244 in the screw feed mechanism is referred to as a “screw portion”. 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 (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 below 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 and the second protrusion 252 are integrally molded with the guide member 242. 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. (A) is a side view, (B) is a bottom view, and (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 forming 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 positions symmetrical 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 a "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 protruding portion 506 is the same as the extending direction 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 an outward force 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 of the recess 336 and gets over the bottom. 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 motion upward (valve opening direction) of the rotating shaft 326 using the first protruding portion 250, the first protruding portion 250 and the rotating 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. A notch 253 extends in the circumferential direction on the outer peripheral surface of the second protrusion 252. The notch 253 extends on a virtual spiral centered on the axis of the guide member 242 in the form of a screw valley. Further, a notch 301 extends in the circumferential direction on the inner peripheral surface of the protrusion 327. The notch 301 extends on a virtual spiral centered on the axis of the rotating shaft 326 in the form of a screw valley. Details of the notch 253 and the notch 301 will be described later.

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. (A) represents a valve closed state, (B) represents a state of being slightly opened from a valve closed state, (C) represents a state of being slightly closed from a fully open state, and (D) represents a fully open state.
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. (A) represents a valve closed state, and (B) represents 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, thereby restricting the downward movement of the rotation shaft 326. 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 shown in FIGS. 5 (D) and 6 (B), the protruding portion 506 is referred to as the “first stopper portion 820”, and the contact surface of the first protruding portion 250 with the protruding portion 506 is referred to as the “first locking surface 830”. That is. A stopper mechanism including the first stopper portion 820 and the first locking surface 830 and restricting the upward movement of the rotating shaft 326 is referred to as a "first stopper mechanism". The first locking surface 830 locks the first stopper portion 820 to regulate the movement of the rotating shaft 326 in the valve opening direction. Further, as shown in FIGS. 5 (A) and 6 (A), the protrusion 327 is referred to as the “second stopper portion 800”, and the contact surface of the second protrusion 252 with the protrusion 327 is referred to as the “second locking surface”. 810 ". A stopper mechanism including the second stopper portion 800 and the second locking surface 810 and restricting the downward movement of the rotating shaft 326 is referred to as a "second stopper mechanism". The second locking surface 810 locks the second stopper portion 800 to regulate the movement of the rotating shaft 326 in the valve closing direction. Further, as shown in FIG. 6A, the contact surface of the second stopper portion 800 with the second locking surface 810 is referred to as a “contact surface 812”.

Returning to FIG. 1, the pressure receiving structure of the motorized valve 100 will be described.
In the motorized valve 100, the fluid introduced from the introduction port 222 is filled inside the can 302 through the inlet port 262 and the valve chamber 266. The upper end of the shaft 246 receives a downward pressure (fluid pressure upstream of the valve 202) due to the fluid introduced inside the can 302. On the other hand, the lower end portion of the shaft 246 (valve body 204) receives an upward pressure (fluid pressure downstream from the valve portion 202) due to the fluid introduced into the outlet port 224 and the outlet port 264. When the valve portion 202 is closed, the fluid pressure upstream of the valve portion 202 is greater than the fluid pressure downstream. Therefore, in the valve closed state, the shaft 246 (valve body 204) receives a force due to the differential pressure between the upstream fluid pressure and the downstream fluid pressure in the valve closing direction. The force for urging the shaft 246 in the valve closing direction is maximized when the valve is closed, that is, when the second locking surface 810 locks the second stopper portion 800 (FIG. 5 (A), FIG. 6 (A)).

When the valve portion 202 is opened from the valve closed state, a force generated by the differential pressure and counteracting the force for urging the shaft 246 in the valve closing direction is required. As described in connection with FIG. 1, the translational motion of the shaft 246 (valve body 204) is a conversion of the rotational motion of the rotor 320 that is integrally displaced. Therefore, the thrust in the axial direction of the valve body 204 becomes larger as the torque urged by the rotor 320 becomes larger. This torque is proportional to the facing area of the rotor 320 and the stator 340. In the present embodiment, when the valve portion 202 is closed, that is, when the second locking surface 810 locks the second stopper portion 800, the rotor 320 and the stator 340 have the same height in the axial direction. Set so that the facing area between the two is maximized. With such a structure, the thrust for pulling up the valve body 204 can be increased.

Here, the structure of the guide member 242 and the rotating shaft 326 will be described.
FIG. 7 shows the structure of the guide member 242 and the rotating shaft 326. (A) is a cross-sectional view including the second locking surface 810 of the guide member 242, (B) is a cross-sectional view including the contact surface 812 of the rotating shaft 326, and (C) is the second protrusion 252 and the second stopper portion. It is a conceptual diagram which shows the contact mode with 800.
As described in relation to FIG. 4, the outer peripheral surface of the second protrusion 252 is provided with a spiral notch 253 similar to the male screw portion 244. Further, on the inner peripheral surface of the protrusion 327, a spiral notch 301 similar to the female screw portion 328 is provided.

The distance between adjacent valleys in the male screw portion 244 of FIG. 7 (A) and the female screw portion 328 of FIG. 7 (B) is referred to as "pitch P". The cross section shown in FIG. 7A exists on a plane including the intersection 253a between the deepest portion of the notch portion 253 and the second locking surface 810 and the axis C1 of the guide member 242. The distance between the notch 253 and the valley of the male screw portion 244 in the axial direction on the plane of this plane on the side including the intersection 253a with respect to the axis C1 (the left half portion in the cross-sectional view of FIG. 7A). L1 is set to a times the pitch P (a is an integer). Further, the cross section shown in FIG. 7B exists on a plane including the intersection 301a between the deepest portion of the cutout portion 301 and the contact surface 812 and the axis C2 of the rotation shaft 326. Of this plane, on the side surface including the intersection 301a with respect to the axis C2 (the right half portion in the cross-sectional view of FIG. 7B), the distance between the notch portion 301 and the valley portion of the female screw portion 328 in the axial direction. L2 is also set to b times the pitch P (b is an integer). Note that a and b may be the same number or different numbers. The technical significance of the distance L1 and the distance L2 will be described later together with the description of FIG. 7 (C).

The molding of the male threaded portion 244 of the guide member 242 and the female threaded portion 328 of the rotating shaft 326 will be described. As described in relation to FIG. 1, the guide member 242 is obtained by cutting a cylindrical metal material (hereinafter, referred to as “cylindrical member”). In the cutting process of the guide member 242, the first protrusion 250 and the second protrusion 252 are formed on the outer peripheral surface of the columnar member. The male screw portion 244 is formed by moving the machining tool from the machining start position of the male screw portion 244 to the direction close to the protrusion 252 while rotating the columnar member around its axis. After forming the male thread portion 244, the notch portion 253 is formed on the outer peripheral surface of the columnar member using the machining tool while maintaining the rotation of the columnar member and the movement of the machining tool. As a result, the distance L1 becomes an integral multiple of the pitch P.

The rotating shaft 326 is obtained by cutting a cylindrical metal material (hereinafter, referred to as "cylindrical member"). Prior to the cutting process of the female thread portion 328, the notch portion 301 is formed on the inner peripheral surface of the cylindrical member while rotating the cylindrical member about its axis. The notch 301 is formed by moving a machining tool used for forming the female thread 328 in the axial direction. The female threaded portion 328 is formed by moving the machining tool in a direction away from the notch 301 while maintaining the rotation of the cylindrical member and the movement of the machining tool. As a result, the distance L2 becomes an integral multiple of the pitch P.

In the present embodiment, the second locking surface 810 and the male screw portion 244 are integrally molded with the guide member 242. Further, the second stopper portion 800 and the female screw portion 328 are integrally molded with the rotating shaft 326. In order for the second locking surface 810 to lock the second stopper portion 800, as will be described later, the phase management between the second locking surface 810 and the male screw portion 244 and the phase between the contact surface 812 and the female screw portion 328 Each must be strictly managed.

FIG. 8 shows a state in which the second stopper portion 800 is locked to the second locking surface 810 (when the valve is closed). (A) is a front view showing the vicinity of the cutout portion 253, and (B) is a cross-sectional view taken along the line AA of (A).
FIG. 9 shows a state in which the rotation shaft 326 is rotated by 150 degrees from the state of FIG. (A) is a front view showing the vicinity of the cutout portion 253, and (B) is a cross-sectional view taken along the line BB of (A).
FIG. 10 shows a state in which the rotation shaft 326 is rotated by 300 degrees from the state of FIG. (A) is a front view showing the vicinity of the cutout portion 253, and (B) is a cross-sectional view taken along the line CC of (A).

When the rotary shaft 326 rotates in the direction corresponding to the valve opening operation from the valve closed state, the second stopper portion 800 approaches the second protrusion 252 at a certain angle. In order to prevent the second stopper portion 800 from hitting the second protrusion 252 and hindering the rotation of the rotation shaft 326, the lower end surface of the second stopper portion 800 is the upper end surface of the second protrusion 252 at this angle. Must be located higher. Therefore, the length in the axial direction of the contact portion between the contact surface 812 and the second locking surface 810 is made shorter than the translational distance (pitch P) of the second stopper portion 800 when the rotation shaft 326 makes one rotation. Set to. As a result, the second stopper portion 800 can move smoothly without hitting the second protrusion 252 when the valve is opened. Further, in order to stably lock the second stopper portion 800 and the second locking surface 810 in the valve closed state, it is necessary to increase the area of the contact portion as much as possible. Therefore, the length of the contact portion in the axial direction is set to a size as close to the pitch P as possible. As a result, the second locking surface 810 can appropriately lock the second stopper portion 800.

As shown in FIG. 8-10, in reality, the second protrusion 252 and the second stopper 800 each extend on a virtual arc centered on the axis. Specifically, the second protrusion 252 and the second stopper 800 each extend on a virtual arc having a central angle of 30 degrees. Therefore, the length in the axial direction of the contact portion between the contact surface 812 and the second locking surface 810 is shorter than the translational distance of the second stopper portion 800 when the second stopper portion 800 rotates 300 degrees, and Set it to be as large as possible. As a result, the second stopper portion 800 does not interfere with the second protrusion 252 during the valve opening operation, and the second locking surface 810 can appropriately lock the second stopper portion 800.

The relationship between the axial length and the pitch P at the contact portion between the contact surface 812 and the second locking surface 810 is the positional relationship between the second locking surface 810 and the male screw portion 244 (phase in consideration of rotation). It is also determined by the positional relationship (phase in consideration of rotation) between the contact surface 812 and the female screw portion 328. These phases will be described below.

Returning to FIG. 7, the distance L1 and the distance L2 will be described.
FIG. 7C shows a contact mode between the second protrusion 252 and the second stopper 800. FIG. 7C shows various lengths of the second protrusion 252 and the second stopper 800. l ₁ indicates the axial distance between the upper end surface of the second protrusion 252 and the intersection 253a. l ₂ indicates the axial distance between the lower end surface of the second stopper portion 800 and the intersection 301a. l _m indicates the axial distance between the intersection 253a and the intersection 301a when the valve is closed.
As described in relation to Figure 8-10, the length _l 1 _{+ l} 2 -l _m in the axial direction in the contact portion of the contact surface 812 and the second locking surface 810 is set to be shorter than the pitch P Will be done. This setting assumes a case where the central angle of the virtual arc extending from each of the second stopper portion 800 and the second protrusion 252 is 0 degrees. Actually, as shown in FIG. 8-10, the second stopper portion 800 and the second protrusion 252 each have a length in the rotation direction of the rotation shaft 326. Returning to FIG. 7C, assuming that the total of the central angles of the virtual arc extending over the second stopper portion 800 and the second protrusion 252 is x degrees, the second stopper portion 800 rotates smoothly when the valve is opened. conditions required to _{becomes l 1 + l 2 -l m <} (1-x / 360) P ( equation 1).

As described in relation to FIGS. 7A and 7B, the distance L1 and the distance L2 are set to a times and b times the pitch P, respectively. That is, both the distance L1 and the distance L2 are set to an integral multiple of the pitch P. When the male threaded portion 244 and the female threaded portion 328 mesh with each other, the ridge portion of the male threaded portion 244 faces the valley portion of the female threaded portion 328. Accordingly, the distance _{l m} shown in FIG. 7 (C) becomes 1 / 2P. Further, the central angle x is determined when designing the second stopper portion 800 and the second protrusion portion 252. Therefore, the remaining variables shown in Equation 1 are the distance l ₁ and the distance l ₂ .
The distance L1 and the distance L2 in both be set to an integral multiple of the pitch P, the distance l _m is determined naturally. Therefore, in order to satisfy Equation 1, it is only necessary to set the distance l ₁ and the distance l ₂ . Since the distance l ₁ and the distance l ₂ are determined based on the central angle x, phase management is also involved as a result. By setting both the distance L1 and the distance L2 to an integral multiple of the pitch P, the design of the second stopper portion 800 and the second protrusion 252 for realizing an appropriate valve opening operation can be simplified.

As described above, according to the first embodiment, the second protrusion 252 (second locking surface 810) is integrally molded with the guide member 242. With this structure, it is not necessary to assemble the second locking surface 810 and the guide member 242, and the assembling property of the solenoid valve 100 is improved.

According to the first embodiment, both the distance L1 and the distance L2 are integral multiples of the pitch P. By setting in this way, the second stopper portion 800 and the second collision for appropriately abutting the contact surface 812 and the second locking surface 810 and smoothly rotating the second stopper portion 800. The design of the part 252 can be simplified.

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 rotary shaft 326 so as to approach the lower end (open end) of the rotary shaft 326. Then, in the fully open state, the position of the first protrusion 250 is the position where the protrusion 506 is locked. In other words, at least a part of the first locking surface 830 is included in the diameter-expanded portion 334 depending on the translation direction position of the rotor 320 (driving state of the rotor 320). Since the first locking surface 830 is recessed into the rotating shaft 326 of the rotor 320, the axial length of the rotor 320, the first stopper mechanism, and the second stopper mechanism can be reduced. Therefore, the length of the motorized valve 100 in the axial direction can be shortened.

According to the first embodiment, the first locking surface 830 and the second locking surface 810 are located between the screwed portion and the valve portion 202. Further, the screwed portion of the screw feed mechanism and the rotor 320 are provided at the same height position in the axial direction. Therefore, the distance between the center of gravity of the rotor 320 and the fulcrum can be shortened, and the rotation of the rotor 320 due to the rotational drive of the rotor 320 can be suppressed.

FIG. 11 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. (A) is a diagram showing a state in which the stopper member 600 is correctly fitted to the rotating shaft 326. FIG. (B) is a diagram showing a state in which the stopper member 600 is about to fall out of the rotating shaft 326.
In FIGS. 11A and 11B, the solid line arrow indicates 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. 11A and 11B) 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. 11A and 11B). 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. 12 is a cross-sectional view of the motor-operated valve 100 when the stopper member 700 in the second embodiment is used for the motor-operated valve 100. (A) represents a valve closed state, and (B) represents 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. 13 is a diagram showing the appearance of the stopper member 700. (A) is a side view, (B) is a perspective view, and (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 protruding portion 706 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. The protruding portion 706 is provided at a distance of 180 degrees from the fitting portion 702b.

FIG. 14 is a perspective view of the vicinity of the stopper member 700 when the stopper member 700 is used for the motorized valve 100. (A) represents a valve closed state, and (B) represents a fully open state.
FIG. 15 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. (A) represents a valve closed state, and (B) represents a fully open state.
As shown in FIGS. 14 (A) and 15 (A), 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, second stopper 800) is locked in the rotation direction of the rotation shaft 326 by the locking surface (second locking surface 810) of the second protrusion 252. With this configuration, the movement of the rotating shaft 326 in the valve closing direction is restricted. Further, as shown in FIGS. 14 (B) and 15 (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 protruding portion 706 (first stopper portion 820) is locked in the rotation direction of the rotation shaft 326 by the locking surface (first locking surface 830) of the first protrusion 250. With this configuration, the movement of the rotary shaft 326 in the valve opening direction is restricted.

As shown in FIGS. 15A and 15B, 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. 16 is a cross-sectional view showing the vicinity of the stopper member 500 of the motor-operated valve 100 in the third embodiment. (A) represents a valve closed state, and (B) represents a fully open state.
FIG. 17 is a diagram showing an operation process of assembling the rotating shaft 326 and the guide member 242. 17 (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. 17A to 17E 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. 16A and 16B, 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. 17 (A) to 17 (E), on the surface of the first protrusion 250 opposite to the locking surface (first locking surface 830) with the protruding portion 506 (first stopper portion 820). A slope portion 254 is provided. 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. 17 (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. 17 (A)). As the extrapolation continues, the protrusion 508 abuts on the slope 254 (FIG. 17B). 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. 17 (C)). When extrapolation is continued, the protrusion 506 gets over the first protrusion 250 (FIG. 17 (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. 17 (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. 18 is a cross-sectional view showing the vicinity of the stopper member 500 of the motor-operated valve 100 in the fourth embodiment. (A) represents a valve closed state, and (B) represents 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. 18A, in the valve closed state, the second protrusion 350 (second stopper 800) and the locking surface (second locking surface 810) of the first protrusion 250 of the guide member 242 Abuts 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. 18 (B), in the fully opened state, the locking surface (first locking surface 830) of the first protrusion 348 (first stopper portion 820) and the first protrusion 250 of the guide member 242. And abut in the direction of rotation. 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.

[Fifth Embodiment]
The fifth embodiment is different from the first embodiment in that the stopper member 500 is not provided. Hereinafter, the differences from the first embodiment will be mainly described.
FIG. 19 is a partially enlarged cross-sectional view showing the vicinity of the stopper mechanism of the motor-operated valve 100 according to the fifth embodiment. (A) indicates a valve operating state, (B) indicates a valve closed state, and (C) indicates a valve open state.
In the fifth embodiment, a part of the opening end portion of the rotating shaft 352 projects in the axial direction to form the stopper portion 840. The stopper portion 840 also serves as a first stopper portion and a second stopper portion. The stopper portion 840 is obtained by bending the protruding portion of the open end portion of the rotating shaft 352. Details of the molding of the stopper portion 840 will be described later.

In the valve closed state, one end surface of the stopper portion 840 in the rotation direction is locked by the locking surface (second locking surface 810) of the second protrusion 252. This structure restricts the movement of the rotary shaft 352 in the valve closing direction (downward direction). Further, in the fully open state, the other end surface of the stopper portion 840 in the rotation direction is locked by the locking surface (first locking surface 830) of the first protrusion 250. This structure restricts the movement of the rotary shaft 352 in the valve opening direction (upward direction).

FIG. 20 is a conceptual diagram showing a molding process of the stopper portion 840. 20 (A)-(C) show the state before the can 302 is assembled to the second body 240. (A) represents a state in which the male screw portion 244 and the female screw portion 328 have begun to mesh, (B) represents a state before processing of the stopper portion 840, and (C) represents a state after processing. The arrows shown in FIGS. 20B and 20C indicate the insertion direction of the tool 900.
First, the male screw portion 244 and the female screw portion 328 are engaged with each other, and the rotary shaft 352 is assembled to the guide member 242. As shown in FIG. 20B, after the protruding portion 354 of the opening end portion of the rotating shaft 352 is positioned at a height between the first protrusion 250 and the second protrusion 252 in the axial direction, the rotor 320 and the second 2 Insert the tool 900 between the body 240 and the body 240. After the tool 900 is brought into contact with the lower end of the protruding portion 354, the protruding portion 354 is bent by pressing the tool 900 in the radial direction of the rotating shaft 352 (FIG. 20 (C)). The protruding portion 354 after bending becomes the stopper portion 840. The stopper portion 840 can also be said to be a "bent portion" at the open end portion of the rotating shaft 352.

In the fifth embodiment, the bent portion at the open end portion of the rotating shaft 352 is used as the stopper portion 840. With such a configuration, the stopper member can be eliminated, so that the number of parts in the solenoid valve 100 can be reduced. Further, since the stopper portion 840 is integrally formed with the rotating shaft 352, the position of the stopper portion 840 on the rotating shaft 352 can be easily managed.

Also in the fifth embodiment, the first locking surface 830 and the second locking surface 810 are located between the screw portion and the valve portion 202. Further, the screwed portion of the screw feed mechanism and the rotor 320 are provided at the same height position in the axial direction. Therefore, the distance between the center of gravity of the rotor 320 and the fulcrum can be shortened, and the rotation of the rotor 320 due to the rotational drive of the rotor 320 can be suppressed.

Also in the fifth embodiment, the first protrusion 250 (first locking surface 830) is located inside the enlarged diameter portion 334 according to the translational direction position of the rotor 320 (driving state of the rotor 320). That is, since the first locking surface 830 is recessed into the rotating shaft 352 of the rotor 320, the axial length of the rotor 320, the first stopper mechanism, and the second stopper mechanism can be reduced. Therefore, the length of the motorized valve 100 in the axial direction can be shortened.

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 first to fourth embodiments, 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 in the vicinity of the opening 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 first to fourth embodiments, 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 first to fourth embodiments, 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 protrusion. Even in this case, it is possible to prevent the stopper member from falling off from the rotating shaft.

In the fifth embodiment, the stopper portion 840 serves as both the first stopper portion and the second stopper portion. In the modified example, two stoppers may be provided. That is, two portions (protruding portions) projecting from the open end portion of the rotating shaft in the axial direction may be provided at positions separated from each other, and bending processing may be performed on each portion. Then, of the bent portions (stopper portions), one is used as the first stopper portion and the other is used as the second stopper portion, and the function of the stopper portion 840 is moved upward and downward of the rotation shaft. It may be configured separately for the time.

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 electric valve is configured as an electric expansion valve, but it may be configured as an on-off valve or a flow rate control valve having no expansion function.

In the above embodiment, an embodiment 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. ..

In the above embodiment, it is assumed that the first protrusion is integrally molded with the guide member. In the modified example, the first protrusion may be configured by another member fixed integrally with the guide member.

In the above embodiment, the notch portion 253 is formed after the processing of the male thread portion 244, and the notch portion 301 is formed before the processing of the female thread portion 328. In the modified example, the notch portion 253 may be formed before the processing of the male thread portion 244, or the notch portion 301 may be formed after the processing of the female thread portion 328. In either case, the distance L1 is formed by forming the notch portion while maintaining the movement of the machining tool and the rotation of the member to be machined by using the tool used for machining the male threaded portion or the female threaded portion. And the distance L2 can be an integral multiple of the pitch P.

In the above embodiment, the embodiment in which the notch is provided at the protrusion of the rotating shaft or the second protrusion of the guide member has been described. In the modified example, the notch portion may be provided in another portion such as a position separated from the stopper portion in the enlarged diameter portion of the rotating shaft or a position separated from the locking surface in the large diameter portion of the guide member. ..

In the above embodiment, it is assumed that the cross section defining the distance L1 exists on a plane including the second locking surface 810 (intersection point 253a) and the axis C1. In the modified example, it may be a plane including another position of the notch portion 253 and the axis C1. Further, in the above embodiment, it is assumed that the cross section defining the distance L2 exists on a plane including the second stopper portion 800 (intersection point 301a) and the axis C2. In the modified example, it may be a plane including another position of the notch 301 and the axis C2.

In the above embodiment, the distance L1 and the distance L2 are set to an integral multiple of the pitch P. In the modified example, the distance L1 and the distance L2 may be an integral multiple of 1/2 pitch (1 / 2P) so as to include the threads and valleys of the threaded portion. Also in this case, by determining the distance between the notch portion and the valley portion of the screw portion, it is possible to simplify the design of the rotating shaft and the guide member for bringing the contact surface and the second locking surface into contact with each other.

In the above embodiment, the aspect in which the lengths of the rotor and the stator in the axial direction are equal has been described. In the modified example, the rotor and the stator may have different lengths, such as by making the stator longer in the axial direction than the rotor. Even in this case, by setting the relative positions of the rotor and the stator to the maximum when the valve is closed, it is possible to increase the thrust when pulling up the valve body in the valve opening direction from the valve closed state. it can.

In the above embodiment, the mode in which the stopper portion is locked to the first protrusion portion or the second protrusion portion in the rotational direction has been described. In the modified example, the stopper portion and the locking surface may be brought into contact with each other in the axial direction of the rotor. For example, in the first embodiment (FIG. 5), the upper surface of the protrusion 506 may be locked to the lower surface of the first protrusion 250 to serve as the first stopper mechanism. Further, the lower surface of the protruding portion 506 may be locked to the upper surface of the second protruding portion 252 to serve as a second stopper mechanism. The positional relationship of the protruding portion 506 in the stopper member 500 may be set so as to have such a locking mode. Further, in the fifth embodiment (FIG. 19), the stopper portion 840 is bent at a right angle to the inner peripheral surface of the rotating shaft 352, and the upper surface and the lower surface thereof are locked to the first protrusion 250 and the second protrusion 252, respectively. You may let me. The same applies to the second to fourth embodiments.

In the above embodiment, the first body 220, the second body 240, and the third body 260 are the bodies of the motor-operated valves, and the configuration in which the motor unit 300 is fixed to these three bodies is exemplified as the motor-operated valves. In the modified example, the second body 240 and the third body 260 may be the body (valve body) of the motorized valve, and the motor unit 300 may be fixed to the second body 240 and the third body 260 to be the "motorized valve". In this case, the first body 220 constitutes a "piping body".

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, 253 notch, 254 slope , 260 3rd body, 262 inlet port, 264 outlet port, 266 valve chamber, 300 motor unit, 301 notch, 302 can, 320 rotor, 322 rotor core, 324 magnet, 325 rotation shaft, 326 rotation shaft, 327 protrusion 328 Female thread part, 330 stopper, 332 back spring, 334 diameter expansion part, 335 diameter expansion part, 336 recess, 337 recess, 338 steps, 340 stator, 342 laminated core, 344 bobbin, 345 coil unit, 346 coil, 348 1st protrusion, 350 2nd protrusion, 400 case, 402 terminal cover part, 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, 800 2nd stopper part, 810 2nd locking surface, 812 contact surface, 820 1st stopper part, 830 1st locking surface, 840 stopper part, 900 tool, L bisector, N narrow Department, S space.

Claims (8)

An inlet port for introducing a fluid from the upstream side, an outlet port for guiding the fluid to the downstream side, and a body provided with a passage for communicating the inlet port and the outlet 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 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 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 stopper portion provided on the guided portion and
A locking surface integrally molded with the guide portion and
Including
An electric valve characterized in that when the valve body is displaced in the valve closing direction by driving the motor, the locking surface locks the stopper portion to regulate the movement of the rotor in the valve closing direction. .. The stopper portion projects from the open end portion of the guided portion in the axial direction of the rotor.
When the valve body is displaced in the valve closing direction by driving the motor, the stopper portion is locked in the rotation direction of the rotor by the locking surface, so that the movement of the rotor in the valve closing direction is restricted. The electric valve according to claim 1. The motorized valve according to claim 2, wherein the guide portion is a machined part made of a metal material. The motorized valve according to claim 3, wherein a first notch for phase control of the male screw portion is provided at a position of the locking surface on the outer peripheral surface of the guide portion. Of the plane including the first notch and the axis of the guide portion, on the surface on the side including the first notch with respect to the axis, the first notch and the valley portion of the male screw portion. The motorized valve according to claim 4, wherein the axial distance to and from the motor valve is an integral multiple of the screw pitch. The guided portion is a machined part made of a metal material.
The stopper portion is integrally molded with the guided portion.
4. The fourth aspect of the present invention is that a second notch for phase control of the female screw portion is provided at a position of a contact surface with the locking surface on the inner peripheral surface of the guided portion. Or the electric valve according to 5. The motor includes a stator for driving the rotor in the opening / closing direction of the valve portion.
The motorized valve according to any one of claims 2 to 6, wherein the facing area between the rotor and the stator becomes maximum when the stopper portion is locked to the locking surface. The motorized valve according to claim 7, wherein the valve body has a pressure receiving structure that receives a fluid pressure in the valve closing direction when the valve portion is closed.

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