JP2002228035A - Motor-driven flow control valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a structure of a stopper of a rotor of a motor-driven flow control valve for opening and closing a valve by vertical movement of the rotor. SOLUTION: The motor-driven flow control valve 10' includes a valve body 11' and a sealing case 31'. A fixed guide 40 is fixed on the valve body 11'. A sleeve 34 screwed in the fixed guide 40 includes a magnet 39 on an outer peripheral part to form a rotor 33. The rotor 33 rotates by current carrying of a stator coil 32, and vertically moves integrally with a valve stem 20. A stopper 51 is mounted on an inner side of an upper end of the sealing case 31' and controls a rising position of the valve stem 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric flow control valve, and more particularly to an electric flow control valve suitable for controlling a flow rate of a refrigerant used in a refrigeration cycle such as cooling and heating.

[0002]

2. Description of the Related Art A conventional electric flow control valve used in a refrigeration cycle includes a valve body having a valve seat and a valve body in a valve chamber, and a stepping motor and the like disposed on the valve body. An electric motor, wherein the electric motor includes a cylindrical closed case, a stator coil disposed outside the closed case, and a rotor disposed in a case inner chamber of the closed case. . The rotor is formed of an aluminum or stainless steel sleeve disposed on the inner peripheral side and a ferrite magnet disposed on the outer peripheral side.

A long rod-shaped valve shaft extends from the case inner chamber to the valve chamber. One end of the valve shaft is slidably supported by the sleeve of the rotor, and the other end of the valve shaft is slidable. The valve is fixed. In the aluminum sleeve of the rotor, a female screw is engraved on an inner periphery, and a lower end thereof is fixed to an upper portion of the valve body, and a stainless steel fixing guide is engraved with an external thread on an outer periphery, The female screw and the male screw are rotatably supported by being screwed together.

[0004] The electric flow control valve having the above-described structure acts to rotate the rotor by energizing and exciting the stator coil. Since the inner female screw of the rotor is screwed to the outer male screw of the fixed guide,
Vertical movement is performed by the rotation. Since the valve shaft is slidably fixed to the rotor, the rotation of the rotor causes the valve shaft to move up and down, and the valve body fixed to the lower end of the valve shaft moves relative to the valve seat. By adjusting the flow path gap, the flow rate of the refrigerant passing through the electric flow control valve is adjusted.

[0005] The case inner chamber and the valve chamber are in communication with each other, and the refrigerant in the valve chamber flows into the case inner chamber. Is supplied to the threaded portion of the female screw and the male screw of the sleeve and the fixed guide, thereby lubricating the threaded portion and improving the rotation of the threaded portion. .

A specific configuration of such a conventional electric flow control valve is disclosed in Japanese Patent Application Laid-Open No. 10-89521.
FIG. 10 shows the conventional electric flow control valve, in which a valve body 11 made of a material such as brass mounts and fixes an electric motor 30 such as a stepping motor on an upper portion, and has a threaded pipe connection on the outside thereof. Parts 12 and 13 are provided, and an opening 18 into which a plug 19 is screwed is provided at the lower part. The upper part of the plug 19 of the valve main body 11 is configured as a valve chamber 15, in which the valve element 17 and the valve seat 21 are arranged on the same axis. The valve body 17 is attached and fixed to a valve shaft 20, and the valve seat body 21 is screwed and fixed to the valve main body 11 so that the vertical position can be adjusted.

[0007] In the pipe connecting portion 12, an inlet side passage 1 is provided.
2a is drilled, and an outlet side passage 13a is drilled in the pipe connection portion 13 so that both passages 12a, 13a are formed.
a is connected to the valve chamber 15 and has strainers 12b and 13b in the two passages, respectively. The intermediate portion of the valve shaft 20 is connected to the upper portion 1 of the valve body 11.
The upper portion 20a of the valve shaft 20 is inserted into the electric motor 30 while being slidably supported by the shaft 1a.

The electric motor 30 is disposed outside the closed case 31 and a cylindrical closed case 31 formed of a non-magnetic plate fixed to the upper portion 11a of the valve body 11. It is composed of a stator coil 32 and a rotor 33 arranged in a case inner chamber 31a of the closed case 31. The rotor 33 is formed by a stainless steel sleeve 34 disposed on the inner peripheral side and a ferrite magnet 39 disposed on the outer peripheral side.
0 from outside of the stator coil 3 via the wiring 32a.
2, a pulse input is applied. In addition,
In the stator coil 32, a fixed plate 50 for preventing rotation is supported by a fixed base 51, and the fixed plate 50 is engaged with the case 31.

Further, the sleeve 34 of the rotor 33
The magnet and the magnet 39 have their fitting joints adhered and fixed with an adhesive, and the toothed retaining ring 4 shown on the upper part thereof.
4 is fixed by pushing in. The toothed retaining ring 44 is formed of an elastic material such as a spring material, and a plurality of inner teeth elastically contact the outer periphery of the sleeve 34.

The closed case 31 is formed of a lower lid 31b and a can body 31c, and the lower lid 31b (the valve body 11).
A fully-closed stopper 35 is fixedly mounted on the lower end of the sleeve 34 of the rotor 33.
5 is in contact with the outer peripheral surface of the rotor 5 to restrict the lower limit of the valve closing of the rotor 33. A valve opening restricting pin 37 is screwed to the upper end of the sleeve 34 so as to adjust the amount of protrusion thereof. When the valve body 17 is fully opened, it comes into contact with a stopper 38 at the upper end of the can body 31c and the rotor The valve opening limit of 33 is regulated.

An upper portion 11a of the valve body 11 is provided with a stainless steel hollow cylindrical fixed guide 4 coaxially with the valve shaft 20 and slidably inserted into the valve shaft 20.
0 is fixed. A male screw 40a is engraved on the outer periphery of the fixed guide 40, and a female screw 34b is engraved on the inner periphery of the center of the sleeve 34. The male screw 40a and the female screw 34b It is screwed.

A valve shaft 2 extending upward from the valve main body 11, penetrating through the cylinder of the fixed guide 40, and further extending upward.
0 is connected to the connecting wall 34 above the sleeve 34.
a projecting end which penetrates a hole formed in the center of a is fixed by a C-ring 41, and is provided between an intermediate step portion of the valve shaft 20 and an inner washer 42 of a connection wall of the sleeve. A buffer spring 43 for urging the valve body 17 in the valve closing direction is interposed.

When the stator coil 32 of the electric motor 30 is energized by applying a pulse signal from the outside, the conventional motorized flow control valve 10 having the above-described structure causes the rotor 33 to rotate based on the electric signal amount. It rotates a predetermined amount. The rotor 33 is fixed to the fixed guide 40 by the
4b, 40a, the rotor 33
The valve shaft 17 is moved in a predetermined vertical direction by the rotation thereof, and the fixed valve shaft 20 is similarly moved in a predetermined vertical direction. Is moved to control the flow rate of the refrigerant controlled by the electric flow rate control valve 10 in accordance with the amount of the pulse input applied to the stator coil 32.

[0014]

Incidentally, in the above-mentioned conventional electric flow control valve, a valve opening regulating pin 37 is provided separately for regulating the opening of the valve shaft 20, and this is provided as a sleeve. 34. For this reason, the pins 37 are separately provided, and both the sleeve 24 and the regulating pins 37 must be processed and provided. This increases the number of parts and the number of processing steps. Further, since it is necessary to properly regulate the fully opened state by raising the valve shaft 20, when the regulating pin 37 and the stopper 38 are provided, the interval between the two must be accurately maintained. There was a problem.

In addition, in the conventional electric flow control valve, the action of expansion and contraction occurs in the closed case 31 due to the pressure fluctuation in the closed case 31, so that the distance between the restriction pin and the stopper is accurately maintained. No, regulation pin 3
There has been a problem that consideration has not been given to the possibility that the valve opening regulation by 7 may not be properly performed.

The present invention has been made in view of the above problems of the electric flow control valve, so that the valve opening can be properly regulated, the number of parts and the number of assembly steps can be reduced, and the workability is improved. It is an object to provide an electric flow control valve.

[0017]

In order to achieve the above object,
The electric flow control valve of the present invention includes a valve body having a valve body in a valve chamber, and an electric motor mounted and fixed on an upper part of the valve body,
The electric assistant has a sealed case, a stator coil arranged outside the sealed case, and a rotor arranged in an inner case inner chamber, and the valve body is connected to the rotor with a valve shaft. And the electric flow control valve, wherein the valve chamber and the case inner chamber allow communication of a control fluid,
An elastic stopper is provided at an upper portion in the closed case, and the opening of the valve shaft is regulated by the stopper.

Further, as a specific mode of the electric flow control valve of the present invention, a stopper is provided at an upper portion in the case,
The stopper has a central portion, a plurality of retaining pieces protruding radially outward from the central portion, a bent portion formed at each end of the retaining piece, and a convex portion formed downward at the central portion. And the upper end of the valve shaft abuts on the convex portion.

Further, as a specific embodiment of the electric flow control valve of the present invention, the upper bent portion is formed by a bifurcated holding piece protruding downward in the same direction as the axial direction of the valve shaft. The case is characterized in that the forked holding piece has a pair of legs, and the pair of legs is engaged with a convex portion formed on the inner surface of the case.

In a specific embodiment of the electric flow control valve according to the present invention, the protrusion formed on the inner surface of the case is provided with a fixing piece for fixing the stator coil formed on the outer surface of the case to the case. It is characterized by being formed by a concave portion that fits.

Further, the electric flow control valve of the present invention
A valve body having a valve body in a valve chamber, and a motor mounted and fixed on the upper portion of the valve body, wherein the motor is disposed in a stator coil disposed outside the closed case, and disposed in an inner case inner chamber. And the valve body is connected to the rotor by a valve shaft, and the valve chamber and the case inner chamber allow communication of control fluid, the electric flow control valve, An elastic stopper is provided at the upper end of the valve shaft, and the opening of the valve shaft is regulated by the stopper.

In a specific embodiment of the electric flow control valve according to the present invention, the stopper is inclined in a radially outward direction from a central portion, and a plurality of locking holding pieces which are directed downward at predetermined intervals are bent. A first bent portion, and a second bent portion inclined inwardly downward from the first bent portion;
An end portion is formed to extend below the second bent portion, and the end portion is mounted on the valve stem.

In a specific embodiment of the electric flow control valve according to the present invention, the stopper is formed by bending a plurality of locking holding pieces projecting horizontally from the central portion at predetermined intervals in a radially outward direction and bending the shoulder. And a plurality of legs extending vertically from the shoulder to form a plurality of legs, and the legs are attached to the valve stem.

In a specific embodiment of the electric flow control valve according to the present invention, the stopper is formed by bending a plurality of locking holding pieces projecting downward at a predetermined interval in a radially outward direction from a central portion and projecting downward. A shoulder extending from the shoulder to form a plurality of legs, the legs being mounted on the valve stem.

In the motor-operated flow control valve of the present invention having the above-described structure, the valve shaft can be restricted from being opened by the elastic stopper, and an accurate valve-opening operation can be realized.

[0026]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view of an electric flow control valve 10 'of this embodiment. The basic structure and operation are the same as those of the conventional electric flow control valve shown in FIG. 5, and in FIG. Since the configuration of the sealed case and the valve body is different, the same parts as those in the configuration of FIG. In addition, in the embodiment of FIG. 1, the outlet side passage 13a formed in the pipe connection part 13 is configured at right angles to the inlet side passage 12a.

In the embodiment shown in FIG.
1 'and the valve body 11' are made of stainless steel, and the sealed case 31 'is applied to the valve body 11' by welding and the sealed case 31 'is fixed to the valve body 11'. Therefore, in the embodiment of FIG. 1, the closed case fixes the can body 31c 'to the valve body 11', so that there is no lower lid.

In FIG. 1, W is a can body 31.
This shows welding between c ′ and the valve body 11 ′, and a stainless steel fixed guide 40 that is inserted coaxially with the valve shaft 20 and slidably inserts the valve shaft 20 is provided in the upper portion 11 a ′ of the valve body 11 ′. The male screw 40a engraved on the outer periphery of the guide 40 and the female screw 34b engraved on the inner periphery of the center of the sleeve 34 are screwed together.

Further, the fitting joint between the sleeve 34 and the magnet 39 is fixed with an adhesive, but it is not always necessary to use an adhesive. A trapezoidal projection 34d is formed on the upper part of the stainless steel sleeve 34, and a disc spring 45 is fitted into a root 34c of the projection 34d by a hole formed at the center thereof, and the disc spring 45 is magnetized. The disc spring 45 is strongly pressed by attaching the C-shaped tongue wheel 46 to a groove formed in the dish at the base portion 34c.

Further, the upper end 20a of the valve shaft 20 has a protruding end press-fitted with the push nut 47 as a press-fitting member, and is tightly fitted. Further, the end face 48 of the protruding end of the valve shaft 20 may be fixed in a radially expanded manner together with the interference fit.

In FIG. 1, reference numeral 51 denotes a stopper, which regulates a fully open upper and lower limit of the rotor 33, and is provided above the case inner chamber 31a of the closed case 31 '. The stopper 51 is, as shown in FIGS. 2A and 2B,
FIG. 2A is a front view of a single part having a spring property formed by integrally forming a thin plate made of, for example, stainless steel and having a thickness of about 0.2 to 0.5 mm by, for example, press working.
As shown in FIG. 2B which is a plan view,
A convex portion 54 formed by an arc-shaped concave portion 53 is formed below. A plurality of (four in the figure) locking and holding pieces 55 projecting outward from the central portion 52 in a radial direction are provided at a predetermined angle.
(In the figure, 90 °). The locking holding piece 55 has a bent portion 57 whose end 56 is bent downward with an appropriate curvature. The forked holding piece 5 extending parallel to the same direction as the axial direction of the valve shaft 20 is provided on the bent portion 57.
8 protrude downward.

The forked holding piece 58 includes a pair of legs 58a,
58a. The leg 58a engages with a plurality of protrusions 59 formed on the inner surface of the can body 31c '. The protrusion 59 is provided with a can body 31c 'for engaging the fixing plate 50.
Is formed on the inner surface of the can body 31c 'formed by the concave portion 60 formed on the outer surface of the can body 31c'. The fixing plate 50 is
Engage with one of the plurality of recesses 60.

When the rotor 33 is fully opened, the upper end of the valve shaft 20 comes into contact with the projection 54 of the stopper 51.
Regulates the upper limit of rotation. Moreover, the sealed case 31 '
Even if a respiratory action such as expansion and contraction occurs in the sealed case 31 due to a change in the pressure inside, the respiratory action can be performed by the elastic action of the stopper 51, so that the valve shaft 20 can be properly restricted.

Further, the stopper 51 is provided with a recess 60 in which the fixed plate 50 for stopping the rotation of the stator coil 32 is locked.
Is locked to the convex portion 59 formed by the
As a result, the locking of the stopper 51 and the locking of the fixing plate 50 are shared, and there is an effect that it is not necessary to provide a special convex portion for locking the stopper 51 on the inner surface of the can body 31c '. It is.

Further, since the valve shaft 20 is in contact with the stopper 51, there is no need to separately provide a regulating pin for regulating the valve opening of the valve shaft 20. This has the effect that there is no need for accurate adjustment.

FIG. 3 is a longitudinal sectional view showing still another embodiment of the present invention. The embodiment shown in FIG. 1 differs from the embodiment shown in FIG. 1 in the structure for preventing the rotation of the stator coil and the top of the can body 31c '. Only the configuration is different, and the other configuration is the same as the configuration in FIG. 1. Therefore, the same components are denoted by the same reference numerals and description thereof is omitted.

In FIG. 3, reference numeral 61 denotes a mounting stand which is integrally provided at a predetermined height when the stator 30 is covered with a resin mold, and is provided on the upper surface of the mounting base 51 around the stator 30 with respect to the can body 31c '. A pressing and locking member 62 made of sheet metal for stopping and retaining is fixed by a screw 63. The pressing and locking member 62 is locked in the concave portion 60 formed on the outer surface of the can body 31c ', and the forked holding piece 58 of the stopper 51 is engaged with the convex portion 59 on the inner surface of the can body 31c'. Also, the top 31d of the can body 31c 'is formed in a curved surface so that the pressure resistance can be obtained even when the pressure in the can inner chamber 31a is increased. Even in this case, the stopper 51 is formed by the spring action. The rotation upper limit of the rotor 33 can be regulated.

FIG. 4 is a longitudinal sectional view showing still another embodiment of the present invention, and FIG. 5 is a view showing a main part thereof. The configuration and operation of the stopper having elasticity are different from those of the configuration shown in FIG. 1, and the other configuration and operation are the same. FIG. 5 is FIG.
Shows the shape of the stopper in FIG.
Is a stopper having elasticity, and the stopper 51 ′ is a push nut 47 press-fitted into the upper end 20 a of the valve shaft 20.
Is mounted due to its elasticity. The stopper 51 '
As shown in FIGS. 5 (a) to 5 (c), it is a single part having a spring property formed by, for example, integrally forming a thin plate made of stainless steel having a thickness of about 0.2 to 0.5 mm by press working, for example. 6 (a), which is a plan view thereof, and FIG.
FIG. 6B showing an X ′ cross section and FIG. 6 showing a bottom view thereof.
As shown in (c), a plurality of (four in the figure) locking holding pieces 60 projecting outward from the center portion 59 are formed at a predetermined angle (90 ° in the figure), It has a cross shape. The locking holding piece 60 is inclined outwardly with the central portion 59 as the top, and is bent inward at the point B shown in FIG. 6B to form a first bent portion B ′, and FIG.
A second bent portion D ′ is formed at a point D shown in FIG. 5, and is formed in a vertical direction from the second bent portion D ′. Therefore, the stopper 5
1 'has elasticity particularly at the points B and D in FIG. 6, and is attached to the push nut 47 at the locking holding piece 60 between the points D and C, and the stopper 51' is elastic. It is fixed to the push nut 47. When the valve shaft 20 is fully opened, the top of the stocker 51 ′ abuts on the top of the closed case 31 to regulate the valve opening. Even if a slight deformation occurs, the effect can be absorbed by the elasticity of the stopper 51 ′,
The valve opening restriction operation can be properly performed.

FIG. 7 is a view showing an embodiment for explaining another structure of the stopper used in the electric flow control valve according to the present invention. FIG. 7 (a) is a plan view thereof, and FIG. 7) is a sectional view taken along the line YY ′ of FIG. 7 (a) and FIG. 7 (c) is a bottom view thereof. The stopper 51A is, for example, a single component having a spring property formed by pressing a stainless steel thin plate having a thickness of about 0.2 to 0.5 mm integrally by pressing.
As shown in (a), a plurality of (four in the figure) locking holding pieces 62 projecting outward from the center part 61 are formed at a predetermined angle (90 ° in the figure) to form a cross shape. Make up. The locking holding piece 62 has a convex portion 63 at the central portion 61, thereby extending horizontally outward as shown in FIG. 7 (b), and is bent at a point E to form a shoulder E '. A leg F having a predetermined length is formed in the vertical direction, and is formed in a substantially cylindrical shape. Accordingly, four legs F of the locking holding piece 62 are formed, and the gap between these legs F is configured to be slightly smaller than the outer diameter of the push nut 47, and the stopper 51A is formed by the legs F.
Is attached to the push nut 47, and the stopper 51A is elastically fixed to the push nut 47 as shown in FIG.

FIG. 8 is a view showing another embodiment of the stopper used for the electric flow control valve according to the present invention. FIG. 8 (a) is a plan view thereof, and FIG. 8) is a sectional view taken along the line ZZ ′ of FIG. 8A, and FIG. 8C is a bottom view thereof. The stopper 51A 'is a single component having a spring property formed by pressing a thin plate of, for example, stainless steel and having a thickness of about 0.2 to 0.5 mm by pressing, and has a center as shown in FIG. A plurality of (four in the figure) locking holding pieces 62 'projecting outward from the portion 64 are formed at a predetermined angle (90 ° in the figure) to form a cross shape. The locking holding piece 62 ′ has a top 64 at the center 61 ′.
As shown in FIG. 8 (b), this extends downwardly in an outward direction, and is bent at a G point to form a shoulder G ′, and a leg portion having a predetermined length in a vertical direction from the G point. F ′ is formed, thereby being formed in a substantially cylindrical shape. Therefore, four legs F 'of the locking holding piece 62 are formed,
The gap between these legs F 'is
The stopper 51A 'is attached to the push nut 47 by these legs F', and the stopper 51A 'is elastically fixed to the push nut 47 as shown in FIG. 8D.

FIG. 9 is a view showing an embodiment for explaining another structure of the stopper used for the electric flow control valve according to the present invention. FIG. 9 (a) is a plan view thereof, and FIG. 9) is a sectional view taken along the line YY ′ of FIG. 9A, and FIG. 9C is a bottom view thereof. Thus, the stopper 51A "is, for example, a single article having a spring property formed by cutting a phosphor bronze material integrally by cutting, and has a thickness of, for example, as shown in FIGS. 9A and 9B. T, inner diameter D and height H are each 0.
For example, the length L and the diameter d are approximately 2 mm and 1 mm, respectively, which are integrally provided at the center on the bottomed cylindrical cup portion 62 ″ and the bottom portion 64 ″ having a length of about 3 mm, 5 mm, and 5 mm. And a rod-shaped projection 63 ".
A metal material other than the phosphor bronze material may be formed by pressing, forging, or cutting. Stopper 51 having such a configuration
A "is configured such that the inner diameter D is slightly smaller than the outer diameter of the push nut 47. When the stopper 51A" is mounted on the valve shaft, the opening 65 "of the cup portion 62" is mounted on the push nut 47. As shown in FIG. 9D, this is performed by being fixed to the push nut 47 by the elasticity of the cup portion 62 ". The stopper 51A" may be fixed to the push nut by caulking or punching. Of course. FIGS. 7 (d), 8 (d) and 9 (d) are views for explaining the fixing of the stoppers 51A, 51A 'and 51A "to the push nut 47. Since they are the same, they are omitted.

The stopper 51A, the stopper 51A 'and the stopper 51A "shown in FIGS. 7, 8 and 9 have the top 64 and the projection 63" of the projection 63 when the valve shaft 20 is fully opened. Abuts on the top of the seal case 31 to perform a valve opening regulating action. In this case, even if a slight deformation occurs in the sealed case 31 due to a change in pressure in the sealed case 31, the effect is recognized by the stopper 51A, the stopper 51A ', and the stopper 51A. Because of the elasticity of "", the valve opening control action can be properly performed.

When the stator coil 32 of the electric motor 30 is excited by an external pulse signal, the electric flow control valve 10 '
The rotor 33 rotates a predetermined amount based on the electric signal amount. The rotor 33 is fixed to the fixed guide 40 by the
4a and 40a, the rotor 33
The valve shaft 17 is moved in a predetermined vertical direction by the rotation thereof, and the fixed valve shaft 20 is similarly moved in a predetermined vertical direction. To control the flow rate of the refrigerant controlled by the electric flow control valve 10 ′, for example, the flow rate of ammonia, in accordance with the amount of pulse input applied to the stator coil 32.

Moreover, since the stopper for regulating the valve opening of the valve shaft is provided at the upper portion of the sealed case or at the upper end of the valve shaft with the elastic function being held, even if the pressure change in the sealed case causes respiration. In addition, the deformation of the closed case is absorbed by the elasticity of the stopper, and the valve opening of the valve shaft can be properly regulated.

[0045]

As will be understood from the above description, the motor-operated flow control valve of the present invention regulates the opening of the valve shaft using the stopper having elasticity. A control valve can be realized, and an electric flow control valve can be provided in which assembly is simplified and assembly steps are reduced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an electric flow control valve according to an embodiment of the present invention.

FIG. 2 is a view for explaining a stopper shown in FIG. 1;

FIG. 3 is a longitudinal sectional view of an electric flow control valve according to another embodiment of the present invention.

FIG. 4 is a longitudinal sectional view of an electric flow control valve according to still another embodiment of the present invention.

FIG. 5 is a diagram showing a main part of FIG. 4;

FIG. 6 is a view for explaining the stopper of FIG. 5;

FIG. 7 is a view showing another embodiment of the stopper used in the electric flow control valve of the present invention.

FIG. 8 is a view showing another embodiment of the stopper used in the electric flow control valve of the present invention.

FIG. 9 is a view showing another embodiment of the stopper used in the electric flow control valve of the present invention.

FIG. 10 is a longitudinal sectional view of a conventional electric flow control valve.

[Explanation of symbols]

 10 'Electric flow control valve 11' Valve body 20 Valve shaft 30 Motor 31 'Sealed case 32 Stator coil 33 Rotor 34 Sleeve 40 Fixed guide 51 Stopper 55 Locking piece

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Hitoshi Umezawa 7-17-24 Todoroki, Setagaya-ku, Tokyo Inside Fuji Machinery Co., Ltd. (72) Kenichi Mochizuki 7-17-24, Todoroki, Setagaya-ku, Tokyo F term in Fujikoki Co., Ltd. (reference) 3H062 AA02 AA15 BB30 BB31 CC02 EE06 HH09

Claims (9)

[Claims] 1. A valve body having a valve body in a valve chamber, a motor mounted and fixed on an upper portion of the valve body, wherein the motor is disposed outside a hermetically sealed case, and a stator coil is provided. And a rotor disposed in the case inner chamber, and the valve body is connected to the rotor by a valve shaft,
An electric flow control valve in which the valve chamber and the case inner chamber allow communication of a control fluid, wherein an elastic stopper is provided at an upper portion in the closed case, and the opening of the valve shaft is regulated by the stopper. An electric shaft flow control valve, characterized in that: 2. The stopper according to claim 1, wherein the stopper has a central portion, a plurality of locking and retaining pieces projecting radially outward from the central portion, a bent portion formed at each end of the retaining piece, and a downwardly formed portion at the central portion. The motor-operated flow control valve according to claim 1, further comprising a convex portion provided, wherein an upper end of the valve shaft abuts on the convex portion. 3. An upper bent portion is formed on a bifurcated holding piece protruding downward parallel to the same direction as the axial direction of the valve shaft, and the bifurcated holding piece has a pair of legs. 3. The electric flow control valve according to claim 2, wherein the pair of legs are engaged with a convex portion formed on an inner surface of the case. 4. The projection formed on the inner surface of the case is formed by a concave portion formed on the outer surface of the case and engaged with a fixing piece for fixing the stator coil to the case. Item 3. An electric flow control valve according to Item 3. 5. A valve body having a valve body in a valve chamber, and a motor mounted and fixed on an upper portion of the valve body, wherein the motor is disposed outside the hermetically sealed case, and a stator coil is provided. And a rotor disposed in the case inner chamber, and the valve body is connected to the rotor by a valve shaft,
An electric flow control valve in which the valve chamber and the case inner chamber allow communication of a control fluid, wherein an elastic stopper is provided at an upper end of the valve shaft, and valve opening of the valve shaft is regulated by the stopper. An electric flow control valve characterized by the above-mentioned. 6. The stopper has a first bent portion in which a plurality of locking holding pieces which are inclined outward from the center portion and are directed downward at predetermined intervals are bent, and the first bent portion is provided. A second bent portion inclined inwardly downward and extending downward from the second bent portion to form an end portion, which end portion is attached to the valve stem; The electric flow control valve according to claim 1, wherein 7. The stopper is formed by bending a plurality of locking and retaining pieces projecting horizontally from the central portion at predetermined intervals in a radially outward direction to form a shoulder, and extending vertically from the shoulder to extend backward. The electric flow control valve according to claim 1, wherein a number of legs are formed, and the legs are mounted on the valve shaft. 8. The stopper is formed by bending a plurality of locking holding pieces projecting obliquely downward at a predetermined interval in a radially outward direction from a central portion to form a shoulder portion, and a vertical portion from the shoulder portion. The electric flow control valve according to claim 1, wherein the plurality of legs extend to form a plurality of legs, and the legs are mounted on the valve shaft. 9. The stopper comprises a cylindrical cup having a bottom and a projection formed at the center of the bottom.
The motor-operated flow control valve according to claim 1, wherein an opening of the cup portion is mounted on the valve shaft.