CN111561570A - Electric valve - Google Patents

Electric valve Download PDF

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Publication number
CN111561570A
CN111561570A CN202010092478.7A CN202010092478A CN111561570A CN 111561570 A CN111561570 A CN 111561570A CN 202010092478 A CN202010092478 A CN 202010092478A CN 111561570 A CN111561570 A CN 111561570A
Authority
CN
China
Prior art keywords
valve
stopper
rotor
projection
electrically operated
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN202010092478.7A
Other languages
Chinese (zh)
Other versions
CN111561570B (en
Inventor
松本道雄
佐伯真司
三浦洋一
汤浅智宏
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TGK Co Ltd
Original Assignee
TGK Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2019024319A external-priority patent/JP7175501B2/en
Priority claimed from JP2019086043A external-priority patent/JP7137218B2/en
Priority claimed from JP2019111263A external-priority patent/JP7226796B2/en
Application filed by TGK Co Ltd filed Critical TGK Co Ltd
Publication of CN111561570A publication Critical patent/CN111561570A/en
Application granted granted Critical
Publication of CN111561570B publication Critical patent/CN111561570B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/02—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with screw-spindle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/02—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with screw-spindle
    • F16K1/04—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with screw-spindle with a cut-off member rigid with the spindle, e.g. main valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/32—Details
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K27/00—Construction of housing; Use of materials therefor
    • F16K27/02—Construction of housing; Use of materials therefor of lift valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
    • F16K31/04—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor
    • F16K31/046—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor with electric means, e.g. electric switches, to control the motor or to control a clutch between the valve and the motor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/44—Mechanical actuating means
    • F16K31/50—Mechanical actuating means with screw-spindle or internally threaded actuating means

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Electrically Driven Valve-Operating Means (AREA)

Abstract

The invention provides an electrically operated valve with excellent assembling performance. The electric valve comprises a feed screw mechanism and a stop mechanism. The feed screw mechanism includes: a guide part provided with a male screw part (244) on the outer peripheral surface; and a cylindrical guided part which is a rotating shaft (326) of the rotor and has an inner peripheral surface provided with a female screw part (328) that is screwed with the male screw part (244). The stop mechanism includes: a stopper portion provided to the guided portion; and a locking surface integrally formed with the guide portion. When the valve element is displaced in the valve closing direction by the driving of the motor, the engaging surface engages with the stopper portion to restrict the movement of the rotor in the valve closing direction.

Description

Electric valve
Technical Field
The present invention relates to an electrically operated valve, and more particularly to a structure of a stopper mechanism for restricting a translational movement of a rotor.
Background
In general, an automotive air conditioner is configured such that a compressor, a condenser, an expansion device, an evaporator, and the like are disposed in a refrigeration cycle. As the expansion device, an electric expansion valve is used in which a stepping motor is used in a driving portion to achieve precise control of the valve opening degree. Such an electric expansion valve has a mechanism for seating/unseating a valve element supported at the tip end of a shaft on/from a valve seat provided in a main body. A technique is proposed which employs a feed screw mechanism to convert the rotational motion of the rotor into the translational motion of the shaft at the time of this seating/unseating.
In order to limit the translational movement of the shaft, such motorized expansion valves are provided with a stop mechanism. Conventionally, there is known an electric expansion valve in which a stopper portion that is displaced integrally with a rotation shaft of a rotor is locked to a stopper portion provided in a main body in a rotation direction of the rotor to exhibit a stopper function (for example, see patent document 1).
[ Prior art documents ]
[ non-patent document ]
Patent document 1 Japanese patent application laid-open No. H10-47517
Disclosure of Invention
[ problems to be solved by the invention ]
Further, when assembling the electric expansion valve, assembly accuracy is required. However, in the case where the stopper is formed using a stopper member that is a member different from the main body as in patent document 1, it is necessary to attach the stopper while considering the positional relationship of the stopper. In such a configuration, there is a risk that assembly may become complicated.
The present invention has been made in view of the above problems, and an object thereof is to improve the assembling property of an electric valve.
[ means for solving the problems ]
One aspect of the present invention is an electrically operated valve. The electric valve comprises: a main body provided with an inlet port for introducing a fluid from an upstream side, an outlet port for discharging the fluid to a downstream side, and a passage for communicating the inlet port and the outlet port; a valve element that opens and closes a valve portion provided in the passage; a motor including a rotor for driving the valve element in an opening and closing direction of the valve portion; a feed screw mechanism that converts rotational motion of the rotor into translational motion; and a stop mechanism that limits translational movement of the rotor. The feed screw mechanism includes: a guide part which is vertically arranged on the main body and is provided with a male thread part on the outer peripheral surface; and a guided portion which is formed of a cylindrical body constituting a rotation shaft of the rotor, has a female screw portion screwed with the male screw portion on an inner peripheral surface, and is supported in a state of being externally inserted into the guide portion. The stop mechanism includes: a stopper portion provided to the guided portion; and a locking surface integrally formed with the guide portion. When the valve element is displaced in the valve closing direction by the driving of the motor, the stopper is engaged by the engaging surface, 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 molded with the guide portion, a process of assembling the locking surface and the guide portion is not required. Therefore, the assembling property of the motor-operated valve can be improved.
[ Effect of the invention ]
According to the present invention, a motor-operated valve having excellent assembly performance can be provided.
Drawings
Fig. 1 is a sectional view showing the structure of an electrically operated valve in embodiment 1.
Fig. 2 is a cross-sectional view showing an opened state of the motor-operated valve.
Fig. 3 is a view showing an external appearance of the stopper member.
Fig. 4 is a partially enlarged view showing a vicinity of the stopper member in a case where the stopper member is assembled to the rotary shaft.
Fig. 5 is a diagram showing an operation procedure in which the motor-operated valve is switched from the closed valve 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 rotary shaft.
Fig. 8 is a view showing a state where the 2 nd stopper portion is locked to the 2 nd locking surface (at the time of valve closing).
Fig. 9 is a diagram showing a state where the 2 nd stopper rotates by 150 degrees from the valve-closed state.
Fig. 10 is a diagram showing a state where the 2 nd stopper is rotated 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 of the comparative example is used in the electric valve.
Fig. 12 is a sectional view of the electric valve when the stopper member according to embodiment 2 is used in the electric valve.
Fig. 13 is a view showing an external appearance of the stopper member.
Fig. 14 is a perspective view of the vicinity of the stopper member when the stopper member is used in the electric 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 sectional view showing the vicinity of the stopper member of the motor-operated valve in embodiment 3.
Fig. 17 is a diagram showing an operation procedure of mounting the rotary shaft and the guide member.
Fig. 18 is a sectional view showing the vicinity of the stopper member of the electric valve in embodiment 4.
Fig. 19 is a partially enlarged sectional view showing the vicinity of the stopper mechanism of the motor-operated valve in embodiment 5.
Fig. 20 is a conceptual diagram illustrating a molding process of the stopper portion.
Detailed Description
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, for convenience, the positional relationship of the respective structures may be expressed with reference to the illustrated state. In the following embodiments and modifications thereof, the same reference numerals are given to substantially the same components, and descriptions thereof are appropriately omitted.
[ embodiment 1 ]
Fig. 1 is a cross-sectional view showing the structure of an electric valve 100 according to embodiment 1.
The motor-operated valve 100 of the present embodiment is a motor-operated expansion valve that functions as an expansion device, and is configured by assembling a main body 200 and a motor unit 300. Inside the main body 200, a valve portion 202 is provided.
At the side of the main body 200, there are provided: an inlet 222 for introducing a high-temperature and high-pressure fluid from the condenser side; and a lead-out port 224 that leads out the low-temperature, low-pressure fluid throttle-expanded at the valve portion 202 to the evaporator.
The main body 200 includes a 1 st main body 220 having a bottom cylindrical shape, a 2 nd main body 240 having a cylindrical shape, and a 3 rd main body 260 having a cylindrical shape. In the upper half of the 1 st body 220, a 2 nd body 240 is provided. In the lower half of the 2 nd body 240, a 3 rd body 260 is provided. The 3 rd body 260 is located inside the 1 st body 220. Inside the 3 rd body 260, the valve portion 202 is housed. A guide member 242 (guide portion) is provided upright at the center of the upper portion of the 2 nd main body 240. The guide member 242 is a machined member made of a metal material, and an external thread portion 244 is formed on the outer peripheral surface of the axial center portion 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 upper center of the 2 nd body 240. Inside the 2 nd body 240, a shaft 246 extending from the rotor 320 of the motor unit 300 is inserted therethrough. The lower end of the shaft 246 also serves as the valve body 204 constituting the valve portion 202. The guide member 242 has an inner circumferential surface for slidably supporting the shaft 246 in the axial direction, and an outer circumferential surface for rotatably and slidably supporting (a guided portion) of the rotary shaft 326 of the rotor 320.
An inlet port 222 is provided on one side of the 1 st main body 220, and an outlet port 224 is provided on the other side. Inlet 222 introduces fluid and outlet 224 delivers fluid. The introduction port 222 and the discharge port 224 communicate with each other through an internal passage formed in the 3 rd body 260.
An inlet port 262 is provided on the side of the 3 rd body 260, and an outlet port 264 is provided on the bottom. Inlet port 262 communicates with introduction port 222, and outlet port 264 communicates with discharge port 224. The inlet port 262 communicates with the outlet port 264 via a valve chamber 266. The 3 rd body 260 has a valve hole 208 formed therein, and a valve seat 210 is formed at an upper end edge of the valve hole. The opening degree of the valve portion 202 is adjusted by the contact/separation of the valve element 204 with/from the valve seat 210.
An E-ring 212 is fitted to a lower portion of the shaft 246 inside the valve chamber 266. Above the E-ring 212, a spring bracket 214 is provided. A spring holder 248 is also provided below the guide member 242, and a spring 216 that biases the valve body 204 in the valve closing direction of the valve portion 202 is inserted between the 2 spring holders 214 and 248 coaxially with the valve body 204. In the present embodiment, the lower end portion of the shaft 246 also serves as the valve body 204, and therefore the spring 216 also biases 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 housing 302, and is configured to: a rotor 320 is disposed inside the housing 302, and a stator 340 is disposed outside.
The stator 340 includes a laminated core 342, and a bobbin 344. The laminated core 342 is configured to: the plate-shaped cores are stacked 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 provided integrally with the housing 400 by molding. A cover 440 is snap-fitted to an opening at the upper end of the housing 400. In a space S surrounded by the case 400 and the cover 440, a printed wiring board 420 is provided. The coil 346 is connected to the printed wiring board 420. The housing 400 is provided with a terminal cover 402 to protect a terminal 422, and the terminal 422 is used to supply electric power from an external power supply to the printed wiring board 420.
Annular seal members 206 and 201 are respectively attached between the 3 rd body 260 and the 1 st body 220 and between the 2 nd body 240 and the 1 st body 220. With this configuration, leakage of fluid through a gap (clearance) between the 1 st body 220 and the 3 rd body 260 and a gap between the 2 nd body 240 and the 1 st body 220 can be prevented. Further, an annular seal member 203 is mounted between the 2 nd main body 240 and the housing 400. With this configuration, intrusion of outside air (moisture, etc.) through the gap between the 2 nd main body 240 and the casing 400 can be prevented.
The rotor 320 includes: a cylindrical rotor core 322; and magnets 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 into a plurality of poles along its circumference.
The rotary shaft 326 is a machined product made of a metal material. The rotary shaft 326 is formed by integrally molding a metal material into a bottomed cylindrical shape. The rotary shaft 326 is inserted with its open end being positioned at the lower portion and externally fitted to the guide member 242. A female screw portion 328 is formed on the inner peripheral surface of the rotary shaft 326, and the female screw portion 328 is engaged with the male screw portion 244 of the guide member 242. The rotational motion of the rotor 320 is converted into a translational motion in the axial direction by the feed screw mechanism formed by these threaded portions. The meshing position of the female screw portion 328 and the male screw portion 244 in the feed screw mechanism is referred to as a "threaded portion". Details of the configuration near the open end of the rotary shaft 326 will be described later.
The upper portion of the shaft 246 is reduced in diameter, which extends through the bottom 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 biases the shaft 246 downward (in the valve closing direction) is attached between the base end of the reduced diameter portion and the bottom of the rotating shaft 326. With such a configuration, when the valve portion 202 is opened, the shaft 246 is displaced integrally with the rotor 320 in a state where the stopper 330 is locked to the bottom of the rotary 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 element 204 from the valve seat 210. The valve body 204 can be pressed against the valve seat 210 by the elastic reaction force of the back spring 332 at this time, 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 motor-operated valve 100.
The electric valve 100 has a stop mechanism that limits the translational movement of the rotary shaft 326. The stopper mechanism includes a convex portion provided at the opening end of the rotating shaft 326, and 2 convex portions and stopper members 500 provided on the outer peripheral surface of the guide member 242.
The rotating shaft 326 has a diameter-enlarged portion 334 having an enlarged diameter at a lower portion. The enlarged diameter portion 334 extends from just below the female screw portion 328 to the lower end of the rotating shaft 326. An opening end of the rotary shaft 326 faces downward of the rotor 320, and an annular recess 336 is provided along an outer peripheral surface thereof. In the recess 336, the stopper member 500 is fitted.
A 1 st projection 250 is provided on the outer peripheral surface of the guide member 242 so as to project slightly below the male screw portion 244. Further below the 1 st projection 250, a 2 nd projection 252 is provided in a projecting manner. The 1 st projection 250 is provided in a state of projecting radially outward from the outer circumferential surface of the guide member 242. The height of the 1 st convex part 250 is set lower than the height of the 2 nd convex part 252. In embodiment 1, the 2 nd projecting portion 252 forms the upper end portion of the large diameter portion 245. The 1 st projection 250 and the 2 nd projection 252 are integrally formed with the guide member 242. The 1 st lobe 250 defines a top dead center in the translational movement of the rotation shaft 326, and the 2 nd lobe 252 defines a bottom dead center.
The feed screw mechanism is operated by driving of the motor unit 300, and when the rotary shaft 326 starts moving upward, the shaft 246 and the rotor 320 displace integrally. By this displacement, the spool 204 is disengaged from the valve seat 210. Thus, 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 introduction port 224 in this order and flows out.
As shown in fig. 1, in the valve-closed state, a part of the opening end of the rotating shaft 326 abuts against the upper end (the 2 nd convex portion 252 in fig. 2) of the large diameter portion 245. On the other hand, as shown in fig. 2, in the fully opened state, a part of the stopper member 500 abuts on the 1 st projection 250. The translational movement to the lower side (valve closing direction) and the upper side (valve opening direction) of the rotating shaft 326 is restricted by these two contact means. The details of the abutment scheme will be described later.
Next, the structure of the stopper member 500 will be described.
Fig. 3 is a view showing an external appearance of stopper member 500. (A) Is a side view, (B) is a bottom view, and (C) is a perspective view.
The stop member 500 is constructed of a spring material. The stopper member 500 is obtained by: the strip-shaped portion obtained by pressing the plate material is bent and formed into a shape of a clip. The stopper member 500 includes an arc-shaped fitting portion 502, a connecting portion 504 in a U-shape in plan view, and a guide portion 505. In the stopper member 500, the fitting portion 502 extends from both end portions of the coupling portion 504, and the guide portion 505 extends from an end portion of the fitting portion 502 on the opposite side of the coupling portion 504. The stopper member 500 has a substantially symmetrical structure (except for a boss 508 described later) with respect to the bisector L of the coupling portion 504.
The fitting portion 502 is constituted by 2 arc-shaped fitting members 503. The 2 fitting members 503 are provided at symmetrical positions with respect to the bisector L. The 2 fitting members 503 have the same inscribed circle. The curvature of the inscribed circle of the fitting portion 502 (inscribed circle of the fitting member 503) is equal to the curvature at the bottom of the recess 336. The guide 505 is constituted by 2 guide members 507. These guide members 507 are in the following shape: extend from the connection point with the fitting member 503 in the direction of approaching each other, and extend in the direction of separating/contacting each other in the middle. A portion of the guide portion 505 where the distance between the 2 guide members 507 is shortest (a portion that changes from the approaching direction to the separating/contacting direction) is referred to as a "narrow portion N".
Stop member 500 further includes a projection 506. The protrusion 506 is L-shaped in side view, protrudes downward from the connection portion 504, and extends in the direction of the inscribed circle center axis of the fitting portion 502. The direction of extension of the projection 506 is the same as the direction of extension of the bisector L. The front end of the projection 506 is tapered. Further, the front end face of the projecting portion 506 has a curvature. The projection 506 includes a boss 508 at the side of the front end. The boss 508 extends circumferentially from the projection 506.
Fig. 4 is a partially enlarged view showing a vicinity of the stopper member 500 in a case where the stopper member 500 is assembled to the rotary shaft 326.
The lower end of the rotating shaft 326 has a stepped shape. The step includes a step portion 338 and a convex portion 327. The stepped portion 338 is formed in a concave shape from the lower end surface of the rotary shaft 326. The stepped portion 338 extends in the rotation direction of the rotation shaft 326 (the circumferential direction of the rotation shaft 326). At step 338, the projection 506 is radially inserted therethrough. The protruding portion 506 is movable only in the range of the stepped portion 338 in the rotational direction. The convex portion 327 is formed to be convex from the lower end surface of the rotating shaft 326. The convex portion 327 and the 1 st convex portion 250 sandwich the convex portion 506 therebetween. That is, in the convex portion 327, a portion opposed to the convex portion 506 functions as a "sandwiching portion". The opposite side portion functions as a "locking portion" with the 2 nd convex portion 252 (details will be described later).
The stopper member 500 is assembled to the rotation shaft 326 in a state where the projection 506 is positioned below the fitting portion 502. The fitting portion 502 is fitted into the recess 336.
A gap is formed between the inner peripheral surface of the enlarged diameter portion 334 and the outer peripheral surface of the guide member 242. The front end of the projection 506 is located in the gap. That is, the projection 506 projects radially inward from the inner peripheral surface of the rotary shaft 326. Further, between the front end surface of the projecting portion 506 and the outer peripheral surface of the guide member 242, a gap is provided. Therefore, the stopper member 500 is movable in the rotation direction of the rotation shaft 326 around the guide member 242.
At a certain point of the translational movement of the rotation shaft 326 (described later in detail), the projection 506 is locked by the 1 st projection 250 in the rotation direction of the rotation shaft 326. At this time, in the convex portion 506, the convex portion 327 (functioning as a "sandwiching portion") abuts against a surface opposite to a surface abutting against the 1 st convex portion 250. The convex portion 327 presses the convex portion 506 in the rotation direction of the rotation shaft 326, and sandwiches it with the 1 st convex portion 250.
A boss portion 508 is inserted between the inner peripheral surface of the convex portion 327 and the outer peripheral surface of the guide member 242. That is, the boss 508 is radially sandwiched between the inner peripheral surface of the projection 327 and the outer peripheral surface of the guide member 242. By providing this configuration, even when stopper member 500 receives a radially outward force, boss 508 can abut against the inner peripheral surface of convex portion 327 and stay inside convex portion 327. Therefore, the stopper member 500 does not fall off the rotation shaft 326. The projection 508 is also referred to as a "catching portion" for preventing the stopper member 500 from falling off the rotation shaft 326.
Here, a method of assembling the rotary shaft 326, the guide member 242, and the stopper member 500 will be described with reference to fig. 4.
First, the leading end of the guide member 242 is inserted into the rotating shaft 326. The male screw portion 244 is screwed into the female screw portion 328 (see fig. 1), and the guide member 242 is inserted into the rotary shaft 326. A gap is present between the 1 st convex portion 250 and the diameter-enlarged portion 334. Since the gap exists, the 1 st projection 250 can be inserted into the inside of the enlarged diameter part 334. After the 1 st convex portion 250 is inserted above the stepped portion 338, the stopper member 500 is fitted to the rotary shaft 326 in the radial direction. At this time, first, the end of the guide 505 is brought into close contact with the bottom of the recess 336, and the guide 505 and the fitting portion 502 are fitted in this order along the recess 336. The throat portion N of the guide portion 505 becomes larger along the bottom portion of the recess 336 and exceeds the bottom portion. When the narrow portion N passes through the bottom of the recess 336, the increase 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 to the recess 336 is completed. The projection 506 is inserted through the step 338. The boss 508 is inserted between the boss 327 and the guide member 242, and the boss 506 is sandwiched between the boss 327 and the 1 st boss 250. By doing so, the assembly of the rotation shaft 326, the guide member 242, and the stopper member 500 is finished.
When the rotation shaft 326 and the guide member 242 are assembled, the 1 st projection 250 needs to be inserted into the rotation shaft 326. Therefore, the inner diameter of the rotating shaft 326 (the inner diameter of the enlarged diameter portion 334) is set to be larger than the diameter of the circumscribed circle of the 1 st convex portion 250 centered on the axis of the guide member 242. On the other hand, in order to restrict the translational movement of the rotation shaft 326 upward (valve opening direction) using the 1 st convex portion 250, the 1 st convex portion 250 and the rotation shaft 326 need to abut on each other in a rotation direction at a certain portion. In the present embodiment, the rotation shaft 326 and the guide member 242 are assembled, and the 1 st projection 250 is inserted into the rotation shaft 326, and then the stopper member 500 functioning as a stopper is assembled. The stopper projects radially inward from the inner diameter of the rotating shaft 326. With this structure, the assembly of the rotary shaft 326 and the guide member 242 can be smoothly performed. Further, the stopper mechanism functions during the valve opening operation. Therefore, the assembling performance of the motor-operated valve 100 having the stopper mechanism can be improved.
When the stopper member 500 is assembled, the fitting portion 502 can be smoothly fitted into the recess 336 by providing the guide portion 505. Further, since the tip end portion of the projecting portion 506 is tapered, the projecting portion 506 can be smoothly inserted through the stepped portion 338. Further, on the outer peripheral surface of the 2 nd convex portion 252, a notch portion 253 extends in the circumferential direction. The cutout 253 extends in a valley state of the thread on a virtual spiral centered on the axis of the guide member 242. Further, on the inner peripheral surface of the convex portion 327, the notch portion 301 extends in the circumferential direction. The notch 301 extends in a valley state of the screw on a virtual spiral centered on the axis of the rotary shaft 326. The cutout portions 253 and 301 will be described in detail later.
Fig. 5 is a diagram showing an operation procedure of the motor-operated valve 100 in a state of switching from the closed valve state to the fully open state. (A) Showing a closed state, (B) showing a state in which the valve is closed and is slightly opened, (C) showing a state in which the valve is slightly closed from a fully opened state, and (D) showing a fully opened state.
Fig. 6 is a cross-sectional view showing a state in which the vicinity of the stopper member 500 is viewed from below in a state in which the stopper mechanism is operated. (A) A closed valve state is shown, and (B) an open state is shown.
The operation in the vicinity of the stopper member 500 will be described.
When the valve portion 202 is in the closed state, the positional relationship among the rotary shaft 326, the guide member 242, and the stopper member 500 is as shown in fig. 5 (a) and 6 (a). That is, since the 2 nd convex portion 252 and the convex portion 327 (functioning as the "locking portion") abut against each other in the rotation direction of the rotation shaft 326, the movement to the lower side of the rotation shaft 326 is restricted. While the valve portion 202 (see fig. 1) is opened (fig. 5B and 5C), the 2 nd convex portion 252 is separated from the convex portion 327, and the rotary shaft 326 is movable in the axial direction. When the valve portion 202 is fully opened (fig. 5D and 6B), the 1 st projection 250 abuts against the projection 506 and movement upward of the rotary shaft 326 is restricted. In the translational movement of the rotary shaft 326 from the valve-closed state to the fully-opened state of the valve portion 202, the convex portion 327 moves integrally with the convex portion 506.
As shown in fig. 5 (D) and 6 (B), the projecting portion 506 is referred to as a "1 st stopper 820", and the contact surface of the 1 st projection 250 with the projecting portion 506 is referred to as a "1 st locking surface 830". The stopper mechanism including the 1 st stopper 820 and the 1 st locking surface 830 and restricting the upward movement of the rotary shaft 326 is referred to as a "1 st stopper mechanism". The movement of the rotary shaft 326 in the valve opening direction is restricted by the engagement of the 1 st stopper 820 by the 1 st engagement surface 830. As shown in fig. 5 (a) and 6 (a), the convex portion 327 is referred to as a "2 nd stopper 800", and the contact surface of the 2 nd convex portion 252 with the convex portion 327 is referred to as a "2 nd locking surface 810". The stopper mechanism that includes the 2 nd stopper 800 and the 2 nd locking surface 810 and restricts the downward movement of the rotary shaft 326 is referred to as a "2 nd stopper mechanism". The movement of the rotary shaft 326 in the valve closing direction is restricted by the engagement of the 2 nd stopper 800 by the 2 nd engaging surface 810. As shown in fig. 6 (a), the contact surface with the 2 nd locking surface 810 in the 2 nd stopper portion 800 is referred to as "contact surface 812".
Returning to fig. 1, a pressure receiving structure of the electric valve 100 will be described.
In the motor-operated valve 100, the fluid introduced from the inlet port 222 passes through the inlet port 262 and the valve chamber 266 and is filled into the housing 302. The upper end portion of the shaft 246 receives a downward pressure (a fluid pressure upstream of the valve portion 202) due to the fluid introduced into the housing 302. On the other hand, the lower end portion of the shaft 246 (the valve element 204) receives a pressure in the upward direction (a fluid pressure downstream of the valve portion 202) due to the fluid introduced into the lead-out port 224 and the outlet port 264. When the valve portion 202 is closed, the fluid pressure upstream of the valve portion 202 is higher than the fluid pressure downstream. Therefore, in the valve-closed state, the force generated by the differential pressure between the upstream-side fluid pressure and the downstream-side fluid pressure is applied to the shaft 246 (the valve element 204) in the valve-closing direction. The force that urges the shaft 246 in the valve closing direction is the maximum in the valve closed state, that is, when the 2 nd locking surface 810 locks the 2 nd stopper 800 ((a) of fig. 5 and (a) of fig. 6).
When the valve portion 202 is opened from the closed valve state, a force against a force generated by a differential pressure and applied to the shaft 246 in the valve closing direction is required. As described in connection with fig. 1, translational movement of the shaft 246 (spool 204) translates rotational movement of the integrally displaced rotor 320. Therefore, the greater the torque applied to the rotor 320, the greater the thrust force in the axial direction of the spool 204 becomes. The torque is proportional to the relative areas of the rotor 320 and the stator 340. In the present embodiment, when the valve portion 202 is closed, that is, when the 2 nd locking surface 810 locks the 2 nd stopper portion 800, the rotor 320 and the stator 340 are set to have the same height in the axial direction and the facing area of the two is set to be the maximum. With this structure, the thrust for lifting the valve body 204 upward can be increased.
Here, the structure of the guide member 242 and the rotary shaft 326 will be described.
Fig. 7 shows the structure of the guide member 242 and the rotary shaft 326. (A) The section view is a sectional view of the 2 nd locking surface 810 including the guide member 242, (B) is a sectional view of the contact surface 812 including the rotation shaft 326, and (C) is a conceptual view showing a contact scheme of the 2 nd convex portion 252 and the 2 nd stopper portion 800.
As described with reference to fig. 4, a spiral notch 253 similar to the male screw portion 244 is provided on the outer peripheral surface of the 2 nd convex portion 252. Further, a spiral notch 301 similar to the female screw portion 328 is provided on the inner peripheral surface of the convex portion 327.
The distance between adjacent valleys in the male thread portion 244 in fig. 7 (a) and the female thread portion 328 in fig. 7 (B) is referred to as "pitch P". The cross section shown in fig. 7 (a) is on a plane including an intersection 253a of the deepest portion of the notch portion 253 and the 2 nd locking surface 810, and the axis C1 of the guide member 242. In this plane, in a plane (left half in the cross-sectional view of fig. 7 a) on the side including the intersection 253a in the axis C1, a distance L1 in the axial direction between the cutout portion 253 and the trough portion of the male screw portion 244 is set to a times the pitch P (a is an integer). The cross section shown in fig. 7 (B) is on a plane including an intersection 301a of the deepest portion of the notch 301 and the contact surface 812 and the axis C2 of the rotary shaft 326. In this plane, in a plane (right half in the cross-sectional view of fig. 7B) including the intersection point 301a on the axis C2, the axial distance L2 between the notch 301 and the trough of the female screw portion 328 is also set to be B times (B is an integer) the pitch P. The numbers a and b may be the same or different. 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 screw portion 244 of the guide member 242 and the female screw portion 328 of the rotary shaft 326 will be described. As described in connection with fig. 1, the guide member 242 is obtained by cutting a cylindrical metal material (hereinafter, referred to as a "cylindrical member"). In the cutting process of the guide member 242, the 1 st projection 250 and the 2 nd projection 252 are formed on the outer peripheral surface of the columnar member. The male screw portion 244 is molded by moving a machining tool in a direction from a machining start position of the male screw portion 244 toward the convex portion 252 while rotating the columnar member about its axis. After the male screw portion 244 is molded, the cut-out portion 253 is molded on the outer peripheral surface of the cylindrical member by the machining tool while the rotation of the cylindrical member and the movement of the machining tool are maintained. Thus, the distance L1 becomes an integer multiple of the pitch P.
The rotating shaft 326 is obtained by cutting a cylindrical metal material (hereinafter, referred to as a "cylindrical member"). Before the cutting process of the female screw portion 328, the notch 301 is formed in the inner circumferential surface of the cylindrical member while the cylindrical member is rotated about its axis. The notch portion 301 is formed by: the machining tool used for molding the female screw portion 328 is moved in the axial direction. The female screw portion 328 is molded by moving the machining tool in a direction away from the notch portion 301 while maintaining the rotation of the cylindrical member and the movement of the machining tool. Thus, the distance L2 becomes an integer multiple of the pitch P.
In the present embodiment, the 2 nd locking surface 810 and the male screw portion 244 are integrally molded with the guide member 242. Further, the 2 nd stopper 800 and the female thread portion 328 are integrally molded with the rotating shaft 326. In order to engage the 2 nd engaging surface 810 with the 2 nd stopper portion 800, as will be described later, it is necessary to strictly perform phase management of the 2 nd engaging surface 810 and the male screw portion 244 and phase management of the abutment surface 812 and the female screw portion 328, respectively.
Fig. 8 shows a state where the 2 nd stopper 800 is locked to the 2 nd locking surface 810 (when the valve is closed). (A) Is a front view showing the vicinity of the notch 253, and (B) is a sectional view taken along line A-A of (A).
Fig. 9 shows a state where the rotary shaft 326 is rotated by 150 degrees from the state of fig. 8. (A) Is a front view showing the vicinity of the notch 253, and (B) is a sectional view taken along line B-B of (A).
Fig. 10 shows a state in which the rotary shaft 326 is rotated 300 degrees from the state of fig. 8. (A) A front view showing the vicinity of the notch 253, and (B) a cross-sectional view taken along the line C-C of (A).
When the rotating shaft 326 rotates from the valve-closed state in a direction corresponding to the valve-opening operation, the 2 nd stopper 800 approaches the 2 nd convex portion 252 at a certain angle. In order to prevent the 2 nd stopper 800 from hitting the 2 nd protrusion 252 and blocking the rotation of the rotating shaft 326, the lower end surface of the 2 nd stopper 800 must be located above the upper end surface of the 2 nd protrusion 252 at this angle. Therefore, the length in the axial direction at the contact portion between the contact surface 812 and the 2 nd locking surface 810 is set to be shorter than the translational distance (pitch P) of the 2 nd stopper 800 when the rotation shaft 326 rotates by 1 turn. This allows the 2 nd stopper 800 to move smoothly without colliding with the 2 nd projection 252 during the valve opening operation. In the valve-closed state, the area of the contact portion needs to be increased as much as possible in order to stably engage the 2 nd stopper 800 with the 2 nd engaging surface 810. Therefore, the length in the axial direction at the abutting portion is set to a magnitude as close to the pitch P as possible. Thereby, the 2 nd locking surface 810 can be appropriately locked to the 2 nd stopper 800.
As shown in fig. 8 to 10, actually, the 2 nd convex portion 252 and the 2 nd stopper portion 800 extend on virtual arcs centered on the axis line, respectively. Specifically, the 2 nd convex portion 252 and the 2 nd stopper portion 800 extend on virtual arcs having a central angle of 30 degrees, respectively. Therefore, the length in the axial direction at the contact portion between the contact surface 812 and the 2 nd locking surface 810 is set to be shorter and as large as possible than the translational distance of the 2 nd stopper 800 when the 2 nd stopper 800 is rotated by 300 degrees. Thus, the 2 nd stopper 800 can be appropriately locked to the 2 nd stopper 800 without being interfered by the 2 nd convex portion 252 at the time of the valve opening operation, and the 2 nd locking surface 810 can be appropriately locked to the 2 nd stopper 800.
The relationship between the axial length of the contact surface 812 and the 2 nd locking surface 810 at the contact portion and the pitch P is determined by the positional relationship between the 2 nd locking surface 810 and the male screw portion 244 (phase of rotation is taken into consideration), and the positional relationship between the contact surface 812 and the female screw portion 328 (phase of rotation is taken into consideration). These phases are described below.
Returning to fig. 7, the distance L1 and the distance L2 are explained.
Fig. 7 (C) shows an abutment scheme of the 2 nd projection 252 and the 2 nd stopper 800. Fig. 7 (C) shows various lengths of the 2 nd protrusion 252 and the 2 nd stopper 800. l1The axial distance between the upper end surface of the 2 nd convex portion 252 and the intersection 253a is shown. l2The axial distance between the lower end surface of the 2 nd stopper 800 and the intersection 301a is shown. lmThe axial distance between the intersection 253a and the intersection 301a when the valve is closed is shown.
As described with reference to fig. 8 to 10, the length l in the axial direction at the contact portion between the contact surface 812 and the 2 nd locking surface 8101+l2－lmIs set shorter than the pitch P. This setting assumes that both center angles of the virtual arcs formed by extending the 2 nd stopper 800 and the 2 nd protrusion 252 are 0 degree. In practice, as shown in fig. 8-10, the 2 nd stopper 800 and the 2 nd lug 252 have respective lengths in the rotation direction of the rotating shaft 326. Returning to fig. 7 (C), when the sum of the central angles of the virtual arcs formed by extending the 2 nd stopper 800 and the 2 nd protrusion 252 is x degrees, the condition required for smoothly rotating the 2 nd stopper 800 during the valve opening operation is l1+l2－lm< (1-x/360) P (formula 1).
As described with reference to fig. 7 (a) and 7 (B), the distance L1 and the distance L2 are set to be a times and B times the pitch P, respectively. I.e. the distanceThe distance L1 and the distance L2 are both set to integer multiples of the pitch P. When the male thread 244 is engaged with the female thread 328, the crests of the male thread 244 are opposed to the troughs of the female thread 328. Therefore, the distance l shown in FIG. 7 (C)mWill become 1/2P. Furthermore, the center angle x is determined when designing the 2 nd stopper 800 and the 2 nd lug 252. Therefore, the remaining variables among the variables shown in equation 1 become the distance l1And a distance l2。
The distance L is set to be an integer multiple of the pitch P by setting both the distance L1 and the distance L2mIs naturally determined. Therefore, to satisfy equation 1, only the distance l is set1And a distance l2And (4) finishing. Distance l1And a distance l2Is determined based on the central angle x and, consequently, also accompanies phase management. By setting the distance L1 and the distance L2 to integral multiples of the pitch P, the design of the 2 nd stopper 800 and the 2 nd projecting portion 252 for realizing an appropriate valve opening operation can be simplified.
As described above, according to embodiment 1, the 2 nd projecting portion 252 (the 2 nd locking surface 810) is integrally molded with the guide member 242. With this structure, the assembly of the 2 nd locking surface 810 and the guide member 242 is not required, and the assembly performance of the motor-operated valve 100 is improved.
According to embodiment 1, the distance L1 and the distance L2 are both set to integer multiples of the pitch P. By setting in this manner, the abutment surface 812 can be brought into proper abutment with the 2 nd locking surface 810, and the design of the 2 nd stopper 800 and the 2 nd convex portion 252 for smoothly rotating the 2 nd stopper 800 can be simplified.
According to embodiment 1, the stopper member 500 is assembled after the rotation 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 1 st projection 250 centered on the axis of the guide member 242. The enlarged diameter portion 334 extends to the lower end of the rotating shaft 326. This allows the rotation shaft 325 to be smoothly inserted into the guide member 242. Further, the projecting portion 506 projects radially inward from the inner peripheral surface of the rotary shaft 325. Thus, the 1 st projection 250 and the projection 506 can abut against each other in the rotation direction of the rotary shaft 326 during the valve opening operation. Therefore, the translational movement of the rotary shaft 326 in the valve opening direction during the valve opening operation can be restricted.
According to embodiment 1, in the valve-closed state, the 1 st convex portion 250 is positioned inside the rotating shaft 326. When the valve-closed state is shifted to the fully-opened state, the 1 st convex portion 250 is relatively displaced inside the rotating shaft 326 so as to approach the lower end (open end) of the rotating shaft 326. In the fully opened state, the position of the 1 st projection 250 is the position of the locking projection 506. In other words, at least a part of the 1 st locking surface 830 is included in the inside of the diameter-enlarged portion 334 according to the translational direction position of the rotor 320 (the driving state of the rotor 320). Since the 1 st locking surface 830 is in a state of being slid into the rotation shaft 326 of the rotor 320, the axial length of the rotor 320 combined with the 1 st stopper mechanism and the 2 nd stopper mechanism can be reduced. Therefore, the length of the motor-operated valve 100 in the axial direction can be shortened.
According to embodiment 1, the 1 st locking surface 830 and the 2 nd locking surface 810 are located between the screwing portion and the valve portion 202. Further, the screw portion of the feed screw 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 whirling of the rotor 320 caused by the rotational driving of the rotor 320 can be suppressed.
Fig. 11 is a sectional view of the vicinity of the stopper member 600 when the stopper member 600 of the comparative example is used in the electric valve 100, as viewed from below. (A) This is a diagram showing a state in which the stopper member 600 is correctly fitted to the rotary shaft 326. (B) This is a diagram showing a state in which the stopper member 600 has been detached from the rotary shaft 326.
In fig. 11(a) and 11 (B), solid arrows indicate the rotation direction of the rotary shaft 326 during the valve opening operation. The dotted arrow indicates the moving direction of the stopper member 600.
In the stopper member 600, a portion corresponding to the boss 508 (see fig. 3) in the stopper member 500 is not provided at the front end portion of the projection 506. In the fully open state, the projection 506 is locked by the 1 st projection 250 in the rotation direction of the rotation shaft 326. The convex portion 327 abuts against the convex portion 506 with the convex portion 506 sandwiched between the 1 st convex portion 250 and the convex portion 506. After the fully opened state is achieved, the rotary shaft 326 is similarly rotated in the rotation direction (the direction indicated by the solid arrow in fig. 11 a and 11B) at the time of the valve opening operation by driving the motor unit 300. The force of this rotation of the rotation shaft 326 becomes a force with which the convex portion 327 presses the convex portion 506 against the 1 st convex portion 250. The front end of the projection 506 has a tapered shape. Therefore, the convex portion 506 receives a force pushed out in the radial direction outward (the direction indicated by the broken line arrow in fig. 11(a) and 11 (B)) by the pressing force received from the convex portion 327 and the reaction force received from the 1 st convex portion 250. The stopper member 600 is disengaged from the rotation shaft 326 by the pushing force. 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 stopper member 600 may be configured not to have the engaging portion.
[ 2 nd embodiment ]
In embodiment 2, the shape of the stopper member 700 is different from that of embodiment 1. The following description focuses on differences from embodiment 1.
Fig. 12 is a sectional view of the electric valve 100 when the stopper member 700 of embodiment 2 is used in the electric valve 100. (A) A closed valve state is shown, and (B) an open state is shown.
A recess 337 is provided on the outer peripheral surface of the open end of the rotary shaft 326. The stopper member 700 is fitted into the recess 337 and fitted into the opening end of the rotary shaft 326. The structure of the stopper member 700 will be described in detail later.
In the valve-closed state, the convex portion 327 is locked by the 2 nd convex portion 252 in the rotation direction of the rotation shaft 326. With this structure, the movement of the rotary shaft 326 in the valve closing direction (downward direction) is restricted. In the fully open state, a projection 706 (described later) of the stopper member 700 abuts against the 1 st projection 250 in the rotation direction of the rotary shaft 326. With this structure, the movement of the rotary shaft 326 in the valve opening direction (upward direction) is restricted.
Fig. 13 is a view showing an external appearance of the stopper member 700. (A) Is a side view, (B) is a perspective view, and (C) is a top view.
The stopper member 700 has corner-plate-shaped fitting portions 702a, 702b, 702c (collectively referred to as "fitting portions 702"), a disc-shaped coupling portion 704, and a corner-plate-shaped projecting portion 706. The fitting portion 702 has a plate-shaped fitting end portion 708 and a plate-shaped bridge portion 710. The fitting end 708 is provided parallel to the coupling portion 704. The bridge portion 710 bridges the fitting end 708 and the inner peripheral surface of the coupling portion 704, and connects the fitting end 708 to the coupling portion 704. The fitting portion 702 extends in a direction from the inner peripheral surface of the coupling portion 704 toward the center of the inscribed circle of the coupling portion 704. The fitting portions 702 are provided at intervals of 120 degrees in the circumferential direction by 3. The coupling portion 704 connects the fitting portion 702 and the projection portion 706. The projection 706 has a plate-like stopper 712 and a plate-like bridge 714. The stopper portion 712 is provided in parallel with the coupling portion 704. The bridging portions 714 bridge the stopper portions 712 and the inner circumferential surfaces of the coupling portions 704. The height of the coupling portion 704 and the stopper portion 712 is greater than the height of the coupling portion 704 and the fitting end portion 708. The convex portion 706 extends in a direction from the inner peripheral surface of the coupling portion 704 toward the center of the inscribed circle of the coupling portion 704. The convex portions 706 are provided at an interval of 180 degrees from the fitting portion 702 b.
Fig. 14 is a perspective view of the vicinity of the stopper member 700 when the stopper member 700 is used in the electric valve 100. (A) A closed valve state is shown, and (B) an open state is shown.
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) A closed valve state is shown, and (B) an open state is shown.
As shown in fig. 14 (a) and 15 (a), in the valve-closed state, the convex portion 327 is sandwiched between the 2 nd convex portion 252 and the convex portion 706. That is, the convex portion 327 (the locking portion, the 2 nd stopper portion 800) is locked by the locking surface (the 2 nd locking surface 810) of the 2 nd convex portion 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. As shown in fig. 14 (B) and 15 (B), the convex portion 706 is sandwiched between the 1 st convex portion 250 and the convex portion 327 (the sandwiching portion) in the fully open state. That is, the projection 706 (the 1 st stopper 820) is locked by the locking surface (the 1 st locking surface 830) of the 1 st projection 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 fig. 15 (a) and 15 (B), in the stopper member 700, the fitting portion 702B and the projection portion 706 are provided at an interval of 180 degrees. Thus, even if a force acts on the projection 706 in a direction away from the rotation shaft 326 in the fully opened state, the fitting portion 702b is pressed against the rotation shaft 326. Therefore, the stop member 700 does not move away from the rotation shaft 326.
[ embodiment 3 ]
In embodiment 3, the structure of the rotary shaft 326 is different from that in embodiment 1. The following description focuses on differences from embodiment 1.
Fig. 16 is a sectional view showing the vicinity of the stopper member 500 of the electric valve 100 in embodiment 3. (A) A closed valve state is shown, and (B) an open state is shown.
Fig. 17 is a diagram showing an operation procedure of assembling the rotary shaft 326 and the guide member 242. Fig. 17 (a) to 17 (E) are cross-sectional views of the vicinity of the stopper member 500 viewed from below, and show the respective timings of the operation process in order. Solid arrows in fig. 17 (a) to 17 (E) indicate the rotation direction of the rotating shaft 326 during assembly. The dashed arrow indicates the moving direction of the stopper member 500.
As shown in fig. 16 (a) and 16 (B), in embodiment 3, the diameter-enlarged portion 335 of the rotating shaft 326 has a larger diameter than the diameter-enlarged portion 334 of embodiment 1. The assembly of the rotary shaft 326 and the guide member 242 according to embodiment 3 is performed after the stopper member 500 is fitted to the rotary shaft 326 in advance. At the time of this assembly, it is necessary that the stopper member 500 does not interfere with the male screw portion 244. Therefore, in embodiment 3, the enlarged diameter portion 335 is formed to have a large diameter so that the stopper member 500 does not collide with the male screw portion 244.
As shown in fig. 17 a to 17E, inclined portion 254 is provided on the surface of 1 st projection 250 opposite to the locking surface (1 st locking surface 830) of projecting portion 506 (1 st stopper 820). The inclined portion 254 continues the outer peripheral surface of the guide member 242 to the peripheral edge portion of the 1 st convex portion 250. The inclined portion 254 is used when the rotary shaft 326 and the guide member 242 in embodiment 3 are assembled. Hereinafter, fig. 17 (a) to 17 (E) will be described with respect to this assembly.
The stopper member 500 is assembled in advance to the rotation shaft 326. First, the rotation shaft 326 is inserted around the guide member 242 until the lower end of the rotation shaft 326 (see fig. 1) reaches the position of the 1 st projection 250 (fig. 17 a). When the insertion is continued, the projection 508 abuts against the inclined portion 254 (fig. 17B). When the projection 508 abuts against the inclined portion 254 and continues to be inserted, the projection 506 slides up the outer peripheral surface of the 1 st projection 250 along the inclined portion 254 ((C) of fig. 17). When the external insertion is resumed, the projection 506 exceeds the 1 st projection 250 ((D) of fig. 17). Finally, when the rotation shaft 326 and the stopper member 500 are rotated in the direction opposite to the direction of being externally inserted to the guide member 242, the convex portion 327 and the convex portion 506 abut in the rotation direction. The convex portion 506 is sandwiched between the convex portion 327 (sandwiching portion) and the 1 st convex portion 250 ((E) of fig. 17).
As described with reference to fig. 4, in embodiment 1, the stopper member 500 is assembled after the rotation shaft 326 and the guide member 242 are assembled. In embodiment 3, since the inclined portion 254 is provided, the stopper member 500 can be assembled to the rotary shaft 326 in advance, and the rotary shaft 326 and the guide member 242 can be assembled. Therefore, the assembling property of the motor-operated valve 100 can be improved.
[ 4 th embodiment ]
Embodiment 4 differs from embodiment 1 in the position of the 2 nd projection 350. The following description focuses on differences from embodiment 1.
Fig. 18 is a sectional view showing the vicinity of the stopper member 500 of the electric valve 100 in embodiment 4. (A) A closed valve state is shown, and (B) an open state is shown.
In embodiment 4, the proximal end of the enlarged diameter portion 334 is a stepped projection. In embodiment 4, the convex portion 506 is the 1 st convex portion 348, and the convex portion at the base end of the diameter-enlarged portion 334 is the 2 nd convex portion 350. As shown in fig. 18 a, in the valve-closed state, the 2 nd convex portion 350 (the 2 nd stopper 800) abuts against the engagement surface (the 2 nd engagement surface 810) of the 1 st convex portion 250 of the guide member 242 in the rotation direction of the rotation shaft 325. Thereby, during the valve closing operation, the translational movement of the rotary shaft 325 in the valve closing direction is restricted. As shown in fig. 18B, in the fully opened state, the 1 st convex portion 348 (the 1 st stopper 820) abuts against the engagement surface (the 1 st engagement surface 830) of the 1 st convex portion 250 of the guide member 242 in the rotational direction. Thereby, during the valve opening operation, the translational movement of the rotary shaft 325 in the valve opening direction is restricted. With this configuration, the translational movement of the rotation shaft 325 can be appropriately restricted.
[ 5 th embodiment ]
The 5 th embodiment is different from the 1 st embodiment in that a stopper member 500 is not provided. The following description focuses on differences from embodiment 1.
Fig. 19 is a partially enlarged sectional view showing the vicinity of the stopper mechanism of the motor-operated valve 100 in embodiment 5. (A) The valve operating state is shown, (B) the closed valve state is shown, and (C) the opened valve state is shown.
In embodiment 5, a stopper 840 is formed by projecting a part of the opening end of the rotary shaft 352 in the axial direction. The stopper 840 doubles as a 1 st stopper and a 2 nd stopper. The stopper portion 840 is formed by bending a protruding portion of the opening end portion of the rotary shaft 352. The stopper 840 is formed as described later in detail.
In the valve-closed state, one end surface in the rotation direction of the stopper 840 is locked by the locking surface (2 nd locking surface 810) of the 2 nd convex portion 252. With this structure, the movement of the rotary shaft 352 in the valve closing direction (downward direction) is restricted. In the fully opened state, the other end surface of the stopper 840 in the rotation direction is locked by the locking surface (1 st locking surface 830) of the 1 st convex portion 250. With this structure, the movement of the rotary shaft 352 in the valve opening direction (upward direction) is restricted.
Fig. 20 is a conceptual diagram illustrating a molding process of the stopper 840. Fig. 20 (a) to 20(C) each show a state in which the housing 302 is assembled to the 2 nd body 240. (A) The state in which the male screw portion 244 and the female screw portion 328 start to engage with each other is shown, (B) the state before the stopper 840 is machined is shown, and (C) the state after the machining is shown. Arrows illustrated in fig. 20(B) and 20(C) indicate the insertion direction of the tool 900.
First, the male screw portion 244 is engaged with the female screw portion 328, and the rotary shaft 352 is assembled to the guide member 242. As shown in fig. 20(B), after the projection 354 at the opening end of the rotary shaft 352 is positioned at a height between the 1 st projection 250 and the 2 nd projection 252 in the axial direction, the tool 900 is inserted between the rotor 320 and the 2 nd body 240. After the tool 900 is brought into contact with the lower end of the projection 354, the tool 900 is pressed in the radial direction of the rotation shaft 352, whereby the projection 354 is bent (fig. 20C). The convex portion 354 after the bending process becomes a stopper portion 840. The stopper portion 840 is also referred to as a "bent portion" at the open end of the rotating shaft 352.
In embodiment 5, a curved portion at the open end portion of the rotating shaft 352 is set as the stopper portion 840. With this configuration, the stopper member can be eliminated, and therefore the number of components in the motor-operated valve 100 can be reduced. Further, since the stopper portion 840 is integrally molded with the rotating shaft 352, the position management of the stopper portion 840 in the rotating shaft 352 may become easy.
In embodiment 5 as well, the 1 st locking surface 830 and the 2 nd locking surface 810 are positioned between the screwing section and the valve section 202. Further, the screw portion of the feed screw 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 whirling of the rotor 320 caused by the rotational driving of the rotor 320 can be suppressed.
In embodiment 5 as well, the 1 st projection 250 (the 1 st locking surface 830) is positioned inside the diameter-enlarged portion 334 according to the translational direction position of the rotor 320 (the driving state of the rotor 320). That is, since the 1 st locking surface 830 is slid into the rotation shaft 352 of the rotor 320, the axial length of the rotor 320 combined with the 1 st stopper mechanism and the 2 nd stopper mechanism can be reduced. Therefore, the length of the motor-operated valve 100 in the axial direction can be shortened.
Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the specific embodiments, and various modifications can be made within the scope of the technical idea of the present invention.
In the embodiments 1 to 4, the stepped portion is provided at the lower end of the rotating shaft. In the modified example, the projection of the stopper member may be provided radially inward of the inner peripheral surface of the rotation shaft. For example, a hole portion through which the projection is radially inserted may be provided near the opening end of the rotary shaft. Further, the hole may be provided in another portion of the rotary shaft depending on the position of the stopper member in the axial direction.
In the above embodiments 1 to 4, since the convex portion abuts against the 2 nd convex portion, the translational movement of the rotation shaft is restricted. In a modification, the 2 nd projection may be brought into contact with a position different from the projection in the opening end portion of the rotary shaft in the rotation direction of the rotor. In this case, the movement in the axial direction of the rotational axis can be restricted.
In the above embodiments 1 to 4, the projection is provided so as to be sandwiched in the radial direction between the projection and the guide member. In a modification, the projection may be inserted between the guide member and a position different from the projection in the opening end of the rotary shaft. In this case, the rotation shaft can be prevented from coming off the stopper member.
In the above-described embodiment 5, the stopper 840 doubles as the 1 st stopper and the 2 nd stopper. In a modification, 2 stoppers may be provided. That is, 2 parts (projections) projecting in the axial direction from the opening end of the rotary shaft may be provided at mutually separated positions, and bending may be applied to each of the parts. Further, the following may be configured: of the portions (stoppers) obtained by bending the projecting portions, one is a 1 st stopper and the other is a 2 nd stopper, and the function of the stopper 840 is distinguished between when it moves upward and when it moves downward about the rotation axis.
In the above embodiment, the description has been given of the electrically operated valve in which the valve body is seated on and separated from the valve seat and the valve portion is completely closed in the valve closed state. In a modification, the valve body may be inserted into the valve hole and removed, as in a so-called spool valve, and a slight leakage of fluid may be allowed in a valve-closed state.
In the above embodiment, the electrically operated valve is configured as an electrically operated expansion valve, but may be configured as an opening/closing valve or a flow rate control valve having no expansion function.
In the above embodiment, the valve body and the shaft are integrally molded. In the modification, the valve body and the shaft may be separate members and may be displaceable integrally. In this case, the valve body may be structurally integrated with the shaft. Alternatively, the valve element and the shaft may be displaceable integrally and may also be displaceable relative to each other. For example, like the motor-operated valve described in japanese patent application laid-open No. 2016 and 205584, the valve body and the shaft may be displaced integrally when the valve is opened, and may be displaced relative to each other when the valve is closed.
In the above embodiment, the 1 st projection is integrally formed with the guide member. In the modification, the first projecting portion 1 may be integrally fixed to the guide member.
In the above embodiment, the notch 253 is formed after the male screw portion 244 is machined, and the notch 301 is formed before the female screw portion 328 is machined. In the modification, the notch 253 may be formed before the male screw portion 244 is machined, or the notch 301 may be formed after the female screw portion 328 is machined. In either case, the distance L1 and the distance L2 can be set to integer multiples of the pitch P by forming the cut-out portion while maintaining the movement of the machining tool and the rotation of the workpiece member with the tool used for machining the male screw portion or the female screw portion.
In the above embodiment, the notch portion is provided in the convex portion of the rotary shaft or the 2 nd convex portion of the guide member. In the modified example, the cutout portion may be provided in another portion such as a position where the enlarged diameter portion of the rotary shaft is separated from the stopper portion or a position where the large diameter portion of the guide member is separated from the locking surface.
In the above embodiment, the cross section defining the distance L1 is made to exist on the plane including the 2 nd locking face 810 (the intersection 253a) and the axis C1. In a modification, a plane including the axis C1 and other positions of the notch 253 may be provided. Further, in the above embodiment, the cross section defining the distance L2 is made to exist on the plane including the 2 nd stopper 800 (intersection 301a) and the axis C2. In the modification, a plane including the axis C2 and other positions of the notch 301 may be provided.
In the above embodiment, the distance L1 and the distance L2 are integer multiples of the pitch P. In a modification, the distance L1 and the distance L2 may be integral multiples of the 1/2 pitch (1/2P) so as to include peaks and valleys of the threaded portion. In this case, the distance between the notch portion and the trough portion of the threaded portion can be determined, thereby simplifying the design of the rotary shaft and the guide member for bringing the contact surface into contact with the 2 nd locking surface.
In the above embodiment, the lengths of the rotor and the stator in the axial direction are equal to each other. In the modification, the rotor and the stator may be different in length by making the stator longer than the rotor in the axial direction, for example. In this case, the thrust force when the valve body is lifted in the valve opening direction from the valve closed state can be increased by setting the relative position of the rotor and the stator so as to maximize the relative area between the rotor and the stator when the valve is closed.
In the above embodiment, the stopper is locked by the 1 st or 2 nd convex portion in the rotation direction. In the modified example, the stopper portion and the locking surface may be configured to abut against each other in the axial direction of the rotor. For example, in embodiment 1 (fig. 5), the upper surface of the projecting portion 506 may be engaged with the lower surface of the 1 st projecting portion 250 to serve as the 1 st stopper mechanism. The lower surface of the projecting portion 506 may be engaged with the upper surface of the 2 nd projecting portion 252 to serve as the 2 nd stopper mechanism. The positional relationship of the projection 506 of the stopper member 500 may be set so as to be in such a locked state. In embodiment 5 (fig. 19), the stopper 840 may be bent at a right angle to the inner circumferential surface of the rotary shaft 352, and the upper surface and the lower surface may be locked to the 1 st projection 250 and the 2 nd projection 252, respectively. The same applies to embodiments 2 to 4.
In the above embodiment, the following configuration is exemplified as the motor-operated valve: the 1 st body 220, the 2 nd body 240, and the 3 rd body 260 are used as the bodies of the motor-operated valve, and the motor unit 300 is fixed to these 3 bodies. In a modification, the 2 nd and 3 rd bodies 240, 260 may be used as the bodies of the motor-operated valves (valve bodies), and the motor unit 300 may be fixed to the 2 nd and 3 rd bodies 240, 260 to be used as the "motor-operated valve". In this case, the 1 st body 220 constitutes a "piping body".
The present invention is not limited to the above-described embodiments and modifications, and can be embodied by modifying the components without departing from the scope of the invention. Various inventions may be formed by appropriately combining a plurality of constituent elements disclosed in the above-described embodiments or modifications. Further, some of the components may be deleted from all the components shown in the above embodiments and modifications.
[ description of reference numerals ]
100 electric valve, 200 main body, 202 valve portion, 203 sealing member, 204 valve core, 206 sealing member, 208 valve hole, 210 valve seat, 212E ring, 214 spring holder, 216 spring, 220 1 st main body, 222 inlet port, 224 outlet port, 240 nd 2 nd main body, 242 guiding member, 244 male screw portion, 245 large diameter portion, 246 shaft, 248 spring holder, 250 st convex portion, 252 nd convex portion, 253 notch portion, 254 inclined portion, 260 rd 3 rd main body, 262 inlet port, 264 outlet port, 266 valve chamber, 300 motor unit, 301 notch portion, 302 casing, 320 rotor, 322 rotor core, 324 magnet, 325 rotation shaft, 326 rotation shaft, convex portion, 328 female screw portion, 330 stopper, 332 back spring, 334 expanding portion, 335 expanding portion, 336 concave portion, 337 concave portion, 338, 340 stator, 342 laminated core, 344 bobbin, 345 coil unit, 346 coil, 348 st convex portion, 350 nd 2 nd convex portion, 350 nd convex portion, 2 nd step spring, 334 expanding portion, 335 expanding portion, 336 concave, 400 casing, 402 terminal cover body, 420 printed wiring board, 422 terminal, 440 lid, 500 backstop component, 502 jogged part, 503 jogged component, 504 connection part, 505 leading part, 506 bulge, 507 guide component, 508 bulge, 600 backstop component, 700 backstop component, 702 jogged part, 704 connection part, 706 bulge, 708 jogged end, 710 bridge part, 712 backstop part, 714 bridge part, 800 nd backstop part, 810 nd 2 detented surface, 812 abutting surface, 820 th backstop part 1, 830 th detented surface, 840 backstop part, 900 tool, L bisector, N narrow part, S space.

Claims (9)

1. An electrically operated valve, comprising:
a body provided with an inlet port for introducing a fluid from an upstream side, an outlet port for discharging the fluid to a downstream side, and a passage for communicating the inlet port and the outlet port,
a valve element for opening and closing a valve portion provided in the passage,
a motor including a rotor for driving the valve body in an opening/closing direction of the valve portion,
a feed screw mechanism which converts the rotational movement of the rotor into a translational movement, an
A stopper mechanism that limits translational movement of the rotor;
the feed screw mechanism includes:
a guide part which is vertically arranged on the main body and is provided with a male thread part on the outer peripheral surface, an
A guided portion formed of a cylindrical body constituting a rotation shaft of the rotor, having an inner peripheral surface provided with a female screw portion to be screwed with the male screw portion, and supported in a state of being externally inserted into the guide portion;
the stopper mechanism includes:
a stopper portion provided on the guided portion, and
a locking surface integrally formed on the guide portion;
when the valve element is displaced in the valve closing direction by the driving of the motor, the stopper is engaged by the engaging surface, and the movement of the rotor in the valve closing direction is restricted.
2. Electrically operated valve according to claim 1,
the stopper portion protrudes from an opening end portion of the guided portion in an axial direction of the rotor;
when the valve element is displaced in the valve closing direction by the driving of the motor, the stopper portion is locked by the locking surface in the rotation direction of the rotor, and the movement of the rotor in the valve closing direction is restricted.
3. Electrically operated valve according to claim 2,
the guide portion is a cutting member made of a metal material.
4. An electrically operated valve according to claim 3,
a 1 st 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.
5. Electrically operated valve according to claim 4,
in a plane including the 1 st notch and the axis of the guide portion on a side including the 1 st notch with respect to the axis, an axial distance between the 1 st notch and a trough of the male screw portion is an integral multiple of a screw pitch.
6. Electrically operated valve according to claim 4,
the guided portion is a cutting member made of a metal material;
the stopping part is integrally formed on the guided part;
a 2 nd notch for phase control of the female screw portion is provided at a position of an abutting surface with the locking surface in the inner peripheral surface of the guided portion.
7. Electrically operated valve according to claim 5,
the guided portion is a cutting member made of a metal material;
the stopping part is integrally formed on the guided part;
a 2 nd notch for phase control of the female screw portion is provided at a position of an abutting surface with the locking surface in the inner peripheral surface of the guided portion.
8. An electrically operated valve according to any of claims 2 to 7,
the motor includes a stator for driving the rotor in an opening/closing direction of the valve portion;
when the stopper portion is locked to the locking surface, the area of the rotor facing the stator is maximized.
9. The electrically operated valve of claim 8, further comprising:
and a pressure receiving structure in which the valve body receives a fluid pressure in a valve closing direction when the valve portion is closed.
CN202010092478.7A 2019-02-14 2020-02-14 Electric valve Active CN111561570B (en)

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JP2019024319A JP7175501B2 (en) 2019-02-14 2019-02-14 electric valve
JP2019-024319 2019-02-14
JP2019086043A JP7137218B2 (en) 2019-04-26 2019-04-26 electric valve
JP2019-086043 2019-04-26
JP2019111263A JP7226796B2 (en) 2019-06-14 2019-06-14 electric valve
JP2019-111263 2019-06-14

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Publication number Priority date Publication date Assignee Title
JPH06241338A (en) * 1993-02-16 1994-08-30 Fuji Koki Seisakusho:Kk Manufacture of rotor core for motor-operated valve, rotor feed screw and rotor
CN102313061A (en) * 2010-06-29 2012-01-11 株式会社不二工机 Mortor operated valve
CN103144243A (en) * 2011-12-07 2013-06-12 株式会社鹭宫制作所 An embedding formation method enabling threaded parts to integrate through embedding formation

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CN111561572A (en) 2020-08-21
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CN111561570B (en) 2023-09-26
CN111561571B (en) 2023-11-21

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