JP2003329157A - Motorized valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the rotational friction resistance by improving the mounting concentricity of a compression coil spring provided in a valve holder, without increasing the driving force required for opening and closing the valve, and achieving low power consumption. To open and close the valve. SOLUTION: One winding end 29A of a compression coil spring 29 is provided.
Between the spring holder 7 and the inner end face 18Bs of the valve holder 18
Insert 1. The compression coil spring 29 is engaged with the spring receiving member 71 in a radially restricted state, and the spring receiving member 71 is
The compression coil spring 29 is guided to the center of the valve holder 18 by concave and convex engagement with the inner end surface 18B of the valve holder 8.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an electric valve,
In particular, the present invention relates to a stepping motor drive type electric valve used as an electric expansion valve or the like for a refrigeration system.

[0002]

2. Description of the Related Art A stepping motor drive type electric valve used as a variable throttle valve, a flow control valve or the like has a male screw portion of a rotor shaft of a stepping motor screwed into a female screw hole of a female screw member fixed to a valve housing. Then, the rotor shaft is displaced in the axial direction by the screw engagement, and the valve element is opened and closed by the axial displacement of the rotor shaft.

In the electrically operated valve as described above, the valve body can be displaced in the axial direction in the valve holder in order to obtain the sealing pressure when the valve is closed and to prevent the valve body from biting into the valve seat portion. Further, there is known a buffer spring built-in type which is rotatably provided and biases the valve element toward the valve seat by a compression coil spring provided in the valve holder.

Since the valve holder containing the compression coil spring is directly connected to the rotor shaft of the stepping motor, the valve holder always rotates coaxially with the rotor shaft, but the valve body is not connected to the valve seat portion after seated on the valve seat. To prevent rotational friction, the frictional resistance with the valve seat stops and a rotational displacement occurs between the valve holder and the valve body.At this time, the compression coil spring in the valve holder is also connected to the valve body side to rotate. Instead, insert a ball or washer between one winding end of the compression coil spring and the valve holder, or contact the valve holder so that the one coil end of the compression coil spring is rotationally displaced. Making the winding end shape of the compression coil spring on the contact side a pick tail end is shown in Japanese Utility Model Publication No. 3-11491, Japanese Patent Application Laid-Open No. 9-170664, Japanese Patent Application Laid-Open No. 10-220616.

[0005]

In the above-described motorized valve having a built-in buffer spring, if the compression coil spring in the valve holder is not arranged concentrically with the central axis (rotation center) of the valve holder, the valve body will be When the valve holder and the compression coil spring rotate relative to each other after they are seated on the valve seat portion, eccentric motion occurs in the relative rotation portion between the valve holder and the compression coil spring, which causes a large rotational friction. Has not taken this into consideration. Therefore, the conventional one causes a large rotational friction. This requires a large amount of driving force required for opening and closing the valve, which necessitates increasing the output torque of the stepping motor.

Further, when a male screw portion and a female screw portion are formed on the outer diameter portion of the valve holder and the valve housing, the male screw diameter becomes large because it is determined by the outer diameter of the valve holder. It becomes necessary to increase the output torque.

[0007] When the electric valve is used as an electric expansion valve for a refrigeration system or the like, the refrigerant used is a refrigerant circuit by using an alternative refrigerant such as hydrofluorocarbon (HFC) or CO _2. The increase in pressure causes a big problem in the situation where the required driving force for opening and closing the valve increases.

The present invention has been made to solve the above-mentioned problems, and improves the mounting concentricity of the compression coil spring provided in the valve holder to reduce the rotational frictional resistance, thereby reducing the refrigerant used. Hydrofluorocarbon (HFC)
The use of an alternative refrigerant such as CO ₂ or CO ₂ increases the refrigerant circuit pressure, so that even if the required driving force for opening and closing the valve increases, it is possible to provide an electrically operated valve that can open and close the valve satisfactorily with low power. Has an aim.

[0009]

In order to achieve the above object, an electric valve according to the present invention has a valve holder integrated with a rotor shaft of a stepping motor, and the valve holder has a valve body on one end side of the holder. It is movably and rotatably supported in the axial direction, and a compression coil spring is arranged between the back surface side of the valve body in the valve holder and the other end side of the valve holder, and is formed on the rotor shaft. The male screw portion is screwed into a female screw hole of a female screw member fixed to the valve housing, the rotor shaft is displaced in the axial direction by the screw engagement, and the valve element is moved to the valve seat portion by the axial displacement of the rotor shaft. In a motor-operated valve that is driven to open and close with respect to a spring, a spring bearing is provided between one winding end of the compression coil spring and the inner end surface of the valve holder and / or the other winding end of the compression coil spring and the back surface of the valve body. The member is pinched The compression coil spring engages with the spring receiving member in a radially restrained state, and the spring receiving member engages with the inner end surface of the valve holder or the back surface of the valve body in a concavo-convex manner to form the center of the valve holder. Have been guided to.

According to the electrically operated valve of the present invention, the spring receiving member guides the arrangement position of the compression coil spring in the valve holder to the center, thereby improving the mounting concentricity of the compression coil spring.

Further, the motor-operated valve according to the present invention has a valve holder integral with the rotor shaft of the stepping motor, and the valve holder movably and rotatably supports the valve element on one end side of the holder. A compression coil spring is arranged between the back surface side of the valve body in the valve holder and the other end side of the valve holder, and a male screw portion formed on the rotor shaft is fixed to a valve housing. Screwed into the hole,
The rotor shaft is displaced in the axial direction by the screw engagement, and the motor-operated valve that drives the valve element to open and close with respect to the valve seat portion by the axial displacement of the rotor shaft, is provided with one winding end of the compression coil spring. A spring receiving member is sandwiched between the inner end surface of the valve holder or the other winding end of the compression coil spring and the back surface of the valve body, and the compression coil spring is engaged with the spring receiving member in a radially restrained state. The spring receiving member is engaged with the inner end surface of the valve holder or the back surface of the valve body in a concavo-convex manner to be guided to the center of the valve holder, and the spring axis center position is provided on the other winding end of the compression coil spring. Is provided with a projecting line portion bent in the axial direction, and the projecting line portion is engaged with a central small hole formed on the back surface of the valve body or the inner end surface of the valve holder facing the projecting line portion. .

According to the electrically operated valve of the present invention, the spring receiving member guides the arrangement position of the compression coil spring in the valve holder to the center, and the protruding line portion of the compression coil spring is provided on the back surface of the valve body or the valve holder. By engaging with the central small hole of the inner end surface, the center of the other side can be pushed, and the mounting concentricity of the compression coil spring is improved.

Further, the motor-operated valve according to the present invention has a valve holder integral with the rotor shaft of the stepping motor, and the valve holder supports the valve element on one end side of the holder so as to be movable in the axial direction and rotatable. A compression coil spring is arranged between the back surface side of the valve body in the valve holder and the other end side of the valve holder, and a male screw portion formed on the rotor shaft is fixed to a valve housing. Screwed into the hole,
The rotor shaft is displaced in the axial direction by the screw engagement, and the motor-operated valve that drives the valve element to open and close with respect to the valve seat portion by the axial displacement of the rotor shaft, is provided with one winding end of the compression coil spring. A spring bearing member is sandwiched between the inner end surface of the valve holder or the other winding end of the compression coil spring and the back surface of the valve body, and the compression coil spring is radially restrained by the spring bearing member. The spring receiving member is engaged with the inner end surface of the valve holder or the back surface of the valve body in a concavo-convex manner to be guided to the center of the valve holder, and the other winding end of the compression coil spring has a pick tail end shape. And is in contact with the rear surface of the valve body or the central portion of the inner end surface of the valve holder that faces the valve body.

According to the motor-operated valve of the present invention, the spring bearing member guides the arrangement position of the compression coil spring in the valve holder to the center, and the compression coil spring has the pick-tail end-shaped winding end so that the compression coil spring has the rear surface of the valve body. Alternatively, the center of the other side can be pushed by contacting the inner end surface of the valve holder, and the mounting concentricity of the compression coil spring is improved.

Further, it is preferable that the abutting portion of the winding end having the pick tail end shape of the compression coil spring has a conical convex shape that engages with the winding end having the pick tail end shape.

Further, the motor-operated valve according to the present invention has a valve holder integral with the rotor shaft of the stepping motor, and the valve holder supports the valve element at one end side of the holder so as to be movable in the axial direction and rotatable. A compression coil spring is arranged between the back surface side of the valve body in the valve holder and the other end side of the valve holder, and a male screw portion formed on the rotor shaft is fixed to a valve housing. Screwed into the hole,
The rotor shaft is displaced in the axial direction by the screw engagement, and the motor-operated valve that drives the valve element to open and close with respect to the valve seat portion by the axial displacement of the rotor shaft, is provided with one winding end of the compression coil spring. A spring bearing member is sandwiched between the inner end surface of the valve holder or the other winding end of the compression coil spring and the back surface of the valve body, and the compression coil spring is radially restrained by the spring bearing member. The spring receiving member is engaged with the inner end surface of the valve holder or the rear surface of the valve body by projections and depressions to be guided to the center of the valve holder, and the winding end on the small diameter side of the compression coil spring faces this. It contacts the center of the back surface of the valve body or the inner end surface of the valve holder.

According to the electrically operated valve of the present invention, the spring receiving member guides the arrangement position of the compression coil spring by the conical coil spring in the valve holder, and
With the winding end on the smaller diameter side, the compression coil spring can press the center of the other side by contacting the back surface of the valve body or the inner end surface of the valve holder, and the mounting concentricity of the compression coil spring is improved.

Further, a hemispherical convex portion is formed on the back surface of the valve body or the inner end surface of the valve holder, which the winding end on the small diameter side of the conical coil spring faces, and the winding end on the small diameter side of the compression coil spring is formed. It is preferably engaged with the hemispherical convex portion.

Further, in the motor-operated valve according to the present invention, in order to prevent the compression coil spring from buckling and tilting, the spring receiving member guides the inner diameter portion of the compression coil spring, or the compression coil. It has an extension cylindrical portion that guides the outer diameter portion of the spring.

Further, a shaft center hole is formed in the extension shaft-shaped portion of the spring receiving member, and a guide shaft-shaped portion extendedly formed on the spring receiving side facing the spring receiving member is axially provided in the shaft center hole. It is slidably fitted to.

Further, in the motor-operated valve according to the present invention, the engagement between the spring bearing member and the tip end portion of the rotor shaft or the back surface portion of the valve body is uneven in order to obtain a good center guiding action. It is possible to select any one of the planar engagement due to the unevenness, the spherical engagement due to the substantially hemispherical unevenness, and the pivotal engagement due to the substantially conical unevenness.

Further, in the motor-operated valve according to the present invention, between the contact position of the spring receiving member provided on the valve body side with the valve body and the seating position of the valve body with the valve seat member when the valve is closed. The distance is preferably smaller than the diameter of the valve port in this seated position.

Further, in the electrically operated valve according to the present invention, the valve holder and the valve body have thrust surfaces facing each other, and between the thrust surfaces, a metal washer having a highly slippery surface and a washer made of highly slippery resin are provided. Alternatively, a thrust bearing having a low frictional resistance may be sandwiched by a washer or the like having a high lubricity resin coating, and the frictional resistance in the rotational direction between the valve holder and the valve body can be sufficiently reduced by the thrust bearing.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 shows one embodiment of a motor-operated valve according to the present invention.

The electric valve has a valve housing (main body) 10. The valve housing 10 defines a valve chamber 11 therein. In the valve housing 10, a first pipe joint 12 made of copper, which directly communicates with the valve chamber 11, and a valve seat member 14 made of stainless steel or sintered metal, which defines a valve port 13, and which is arranged at a center (center position), A second pipe joint 15 made of copper, which communicates with the valve chamber 11 via the valve port 13, is fixedly mounted by welding, brazing, or the like.

In this embodiment, the first pipe joint 1
2 will be the primary side and the second pipe joint 15 will be described as an example where the refrigerant flows so as to be the secondary side. However, in the motor-operated valve of this embodiment, the second pipe joint 15 is It is a bidirectional type that can be used even when the refrigerant flows such that it becomes the primary side and the first pipe joint 12 becomes the secondary side.

In the valve housing 10, a holding cylinder 2 is mounted by a mount member 19 made of a press-formed product of stainless steel plate.
0 is fixedly mounted at the center of the valve chamber 11. The holding cylinder 20 has a guide hole 20A, and the cylindrical valve holder 18 is supported in the guide hole 20A so as to be slidable in the axial direction at the center position of the valve chamber 11.

A stop ring 17 is attached to one end (lower end) 18A of the valve holder 18, and an inner diameter of the stop ring 17 with the flange 16A formed at the upper end of the valve body 16 mounted on the stop ring 17. The valve element 16 penetrates the portion 24A by loose fitting. As a result, the valve body 16 becomes the valve holder 1
8 is loosely fitted to the inner diameter portion 24A, displaceable in the radial direction, rotationally displaceable, and axially movable. The needle valve portion is moved by moving the valve seat member 14 in the axial direction (vertical direction). The opening and closing of the valve port 13 and the effective opening area are quantitatively increased or decreased by 16B.

In this case, since the valve body 16 is displaceable in the radial direction with respect to the valve holder 18, the arrangement position of the valve holder 18 and the arrangement position of the valve seat member 14 which are determined by the mounting accuracy of the holding cylinder 20 and the like. With respect to the above, the concentricity between the valve element 16 and the valve seat member 14 can be obtained without requiring a high degree of concentric mounting accuracy when assembling them.

The other end (upper end) of the valve holder 18 is one end (lower end) 4 of the rotor shaft 41 of the stepping motor 40.
It is integrated with 1A. In other words, the cylindrical valve holder 18 is integrally formed with the one end portion 41A of the rotor shaft 41.

A compression coil spring 29 is mounted in the valve holder 18 between the upper inner end surface 18B and the back surface 16K of the valve body 16 with a predetermined preload applied. A spring receiving member 71 is sandwiched between one winding end 29A of the compression coil spring 29 and the inner end surface 18B.

As shown in FIG. 2, the spring receiving member 71 has a short shaft-shaped spring stop portion 71A, and the spring stop portion 7 is provided.
The winding end 29A of the compression coil spring 29 is fitted to the outer periphery of the 1A to restrain the radial movement of the compression coil spring 29. In other words, the winding end 29 of the compression coil spring 29.
The A side is engaged with the spring receiving member 71 in a radially restrained state.

A shallow dish-shaped convex portion 71B having a trapezoidal cross section is formed at the center of the surface of the spring receiving member 71 facing the inner end surface 18B of the valve holder 18, and the inner end surface 18B is formed on the spring receiving member 71.
In the center of the surface facing the
C is formed, and the convex portion 71B and the concave portion 18C are planarly engaged with each other. By this engagement, the compression coil spring 2
9 is guided to the central position of the valve holder 18.

A female screw member 31 is fixed to the upper portion 20B of the holding cylinder 20. The female screw member 31 is made of a sintered metal containing a solid lubricant or a synthetic resin such as PPS resin filled with a filler having good lubricity such as fluororesin, and has a female screw hole 32 formed at the center thereof.

A male screw portion 33 having a diameter sufficiently smaller than the outer diameter of the valve holder 18 is integrally formed on the rotor shaft 41. The male screw portion 33 penetrates the female screw hole 32 in a threaded engagement state, and the rotor shaft 41 rotates around its own central axis line to rotate by the screw engagement between the male screw portion 33 and the female screw hole 32. Move in the axial direction.

The motor-operated valve is a hydrofluorocarbon (HF
C), when used as an electric expansion valve for a high-pressure refrigeration system using an alternative refrigerant such as CO ₂ or the like, if the rotor diameter of the stepping motor 40 described later is about 15 to 20 mm, the female screw hole 32 , The effective diameter of the male screw portion 33 is 2.5 to 6.0 mm, and the screw pitch is 0.35 to 0.
It can be set to about 60 mm.

The rotor shaft 41 is fixedly connected to the rotor 43 of the stepping motor 40. The outer peripheral portion 43A of the rotor 43 is a multi-pole permanent magnet with alternating N-pole and S-pole, which is composed of a ferrite sintered product, a rare earth sintered magnet, or a plastic magnet.

A cup-shaped rotor case 44 having a cylindrical cross section made of a press-formed stainless steel plate is hermetically fixed to the upper end surface portion 34 of the valve housing 10. The airtight fixing of the rotor case 44 is performed by abutting the annular opening edge portion 44C of the rotor case 44 against the flat upper end surface portion 34 of the valve housing 10 and butt welding the entire circumference by TIG welding, plasma welding or laser welding. Is done by. This butt weld is designated by reference numeral 3 in FIG.
It is indicated by 5.

The butt welding indicated by the butt welded portion 35 is performed to the same depth as the thickness of the rotor case 44, and the boundary surface between the valve housing 10 and the rotor case 44 is formed by joining the surfaces. Does not exist.

Due to such butt welding, the internal pressure of the rotor case 44 is reduced to the valve housing 10 and the rotor case 44.
There is no action in the direction of separating the welding surface portion of and from, and the compressive strength of the joint portion between the valve housing 10 and the rotor case 44 is improved.

The rotor case 44 accommodates the rotor 43 of the stepping motor 40 concentrically and rotatably inside, and the annular stator element 45 is fixedly arranged outside.

The stator element 45 has stator coils 46 in upper and lower two stages, is entirely molded with an electrically insulating resin 47, and has a plurality of magnetic pole teeth (not shown) at equal intervals on the entire inner peripheral portion. ing.

The mount element 4 is attached to the stator element 45.
9 is fixed. The mount piece 49 is fixed to the stator element 45 by being positioned at a predetermined position related to the circumferential position of the magnetic pole teeth of the stator element 45, and is a hemispherical projection portion 50 as a stator positioning shape portion.
Has been press molded.

Dimples 51 are press-molded on the rotor case 44. The dimple 51 forms a positioning shape portion for the stator into which the hemispherical protrusion 50 fits in the concave portion 51A on the outer peripheral surface side of the rotor case, and the convex portion 51B on the inner peripheral surface side of the rotor case positions the guide support body to be described later. It has a shape.

In the mount piece 49, the hemispherical projection 50 is fitted into the recess 51A of the dimple 51, so that the stator element 45 is prevented from being pulled out and the mounting position of the stator element 45 in the circumferential direction with respect to the rotor case 44 is set. ing.

A guide support 52 is provided in the rotor case 44.
Is fixed. The guide support body 52 has a hanging cylindrical portion (cylindrical body) 53 and an umbrella-shaped portion 54 formed on the upper end side of the hanging cylindrical portion 53, and is integrally formed by press working as a whole. The umbrella-shaped portion 54 is formed in the same shape as the top inner side 44B of the rotor case 44, and the umbrella-shaped portion 54 has a convex portion 51 of the dimple 51 as a positioning shape portion for the guide support.
The notch engaging portion 55 that engages with B is press-molded.

In the guide support body 52, the umbrella-like portion 54 is alignedly engaged with the top inner side 44B of the rotor case 44, and the notch engaging portion 55 is engaged with the convex portion 51B of the dimple 51, whereby the rotor case 44 is formed. It is fixed in the rotor case 44 in a state where the mounting position in the circumferential direction is set.

The hanging cylindrical portion 53 is concentric with the rotor 43 and extends downward from the center of the top of the rotor case 44 in the axial direction. A key-shaped valve-opening stopper projection 56 is axially formed over a predetermined length at a predetermined circumferential position of a base portion (a connection portion with the umbrella-shaped portion 54) of the hanging cylindrical portion 53. Further, at the tip end (lower end) of the hanging cylindrical portion 53,
A positioning hole 57 is press-molded by a louver molding die at a position having a predetermined circumferential positional relationship with the notch engaging portion 55. At the inner part of the positioning hole 57, there is a cut and raised piece (uncut piece) 58 formed by louver molding.

The hanging cylindrical portion 53 is provided with a spiral guide wire body 60 formed in a coil spring shape from a wire material having a spring property so as to surround the outer circumference of the hanging cylindrical portion 53. The spiral guide wire body 60 has a stopper wire body portion (valve closing stopper portion) 61 extended in the axial direction at the lower end portion, and an engagement formed by bending the tip end of the stopper wire body portion 61 inward in the radial direction. It integrally has an end 62.

The spiral guide wire 60 is in contact with the end face of the valve opening stopper protrusion 56 at the upper end side, the engaging end 62 is inserted and fitted in the positioning hole 57, and the tip of the engaging end 62 is the spiral guide wire. The cut-and-raised piece 58 is abutted by the radial elastic force of 60.

As a result, the spiral guide wire 60 is sandwiched between the end surface of the valve-opening stopper projection 56 and the positioning hole 57 by the axial spring load, and is attached in the axial direction without rattling. The stopper wire body portion 61 is positioned and locked by the depending cylindrical portion 53 at a position determined by the arrangement position of the positioning hole 57.

A movable stopper member 63 is rotatably engaged with the spiral guide wire body 60. Movable stopper member 63
Has a one-turn coil spring shape and has a stopper wire body portion 64 extending outward in the radial direction at one end. The rotor 43 has a pin-shaped protrusion 43 for kicking around the movable stopper member 63 at a predetermined circumferential position based on the magnetic pole position of the permanent magnet.
B is integrally molded.

The movable stopper member 63 contacts the pin-shaped protrusion 43B of the rotor 43 at the stopper wire body portion 64, and is kicked around by the rotation of the rotor 43, so that the movable stopper member 63 is guided by the spiral guide wire body 60 while rotating. The spiral guide wire body 60 moves in the axial direction of the spiral guide wire body 60 by the spiral movement, and the stopper wire body portion 64 abuts on the stopper wire body portion 61 of the spiral guide wire body 60, whereby further left rotation is stopped, The origin position of the rotor 43 is mechanically set based on the valve closing reference. Further, when the stopper wire body portion 64 abuts on the valve opening stopper protrusion portion 56, further clockwise rotation is stopped, and the valve open (fully open) position can be mechanically determined.

The hanging cylindrical portion 53 also serves as a rotor bearing guide, and a bearing sleeve 65 is provided in the hanging cylindrical portion 53. The extension shaft portion 41B of the rotor shaft 41 is fitted into the bearing sleeve 65 so as to be rotatable and slidable in the axial direction, and the upper end side of the rotor shaft 41 is the bearing sleeve 6.
Supported by 5.

Here, the cylindrical body for supporting the bearing sleeve 65 is a cylindrical body for supporting the spiral guide wire body that supports the spiral guide wire body 60 of the stopper mechanism for mechanically setting the origin position of the rotor 43. It means that the number of parts can be reduced.

In the motor-operated valve having the above-mentioned structure, the drive pulse signal is applied to the stator element 45,
The rotor 43 rotates in accordance with the number of pulses, the rotor shaft 41 rotates accordingly, and the rotor shaft 41 rotates due to the screw engagement relationship between the male screw portion 33 of the rotor shaft 41 and the fixed female screw member 31. Move in the axial direction.

The upward movement (movement in the valve opening direction) caused by the counterclockwise rotation of the rotor shaft 41 is transmitted to the valve holder 18 and the valve body 16 is moved upward so as to be pulled up by the valve holder 18.

When the rotor shaft 41 descends due to clockwise rotation, the rotor shaft 41 and the valve holder 18 become integral with the valve body 16 until the needle portion 16B of the valve body 16 is seated on the valve seat portion 14. Descends while rotating.

In the downward movement of the rotor shaft 41, the valve body 1
6 is seated on the valve seat portion 14, and thereafter the valve holder 18 moves down together with the rotor shaft 41 while compressing the compression coil spring 29, the friction of the valve body 16 and the valve seat portion 14 causes the rotation of the valve body 16. When stopped, relative rotation between the valve body 16 and the valve holder 18 causes relative rotational friction between the inner end surface 18B of the valve holder 18 and the spring receiving member 71.

At this time, the compression coil spring 29 is guided to the center position of the valve holder 18 by the engagement of the convex portion 71B of the spring receiving member 71 and the concave portion 18C of the valve holder 18. This improves the mounting concentricity of the compression coil spring 29,
Rotational frictional resistance between the inner end surface 18B and the spring bearing member 71 due to the rotation of the rotor shaft 41 is reduced. As a result, the driving force required to open and close the valve is reduced as compared with the conventional one, and the output torque of the stepping motor 40 can be reduced.
Alternatively, it corresponds to high pressure.

As shown in FIG. 3, the spring receiving member 71 is replaced with the winding end 29A of the compression coil spring 29 and the inner end surface 18B of the valve holder 18 instead of the other end of the compression coil spring 29. It can be sandwiched between the winding end 29B and the back surface of the valve element 16.

In this case, the inner end surface 18 of the valve holder 18 is
B is provided with a short shaft-shaped spring stop portion 18D,
The one end 29A of the compression coil spring 29 is engaged with D in a radially restrained state, and the valve body 1 facing the spring receiving member 71 is engaged.
6, a recess 16C having a trapezoidal cross section and having a trapezoidal cross section is provided in the center of the rear surface of the spring 6, and the projections 71B of the spring receiving member 71 and the recess 16 of the valve body 16
C and planarly engage each other, and the other winding end 29B of the compression coil spring 29 is fitted to the outer periphery of the spring stop portion 71A of the spring receiving member 71.

In this case, when the valve body 16 and the valve holder 18 are rotated relative to each other after the valve body 16 is seated on the valve seat portion 14, the compression coil spring 29 rotates together with the valve holder 18.
Relative rotational friction occurs between the valve element 16 and the spring receiving member 71.

In this embodiment, the thrust surfaces of the flange portion 16A of the valve body 16 and the stop ring 17 which face each other are arranged so that the valve body 16 and the valve holder 18 are relatively rotated with low friction. An auxiliary thrust bearing 21 is provided by a metal washer having a highly slippery surface, a washer made of a highly slippery resin such as fluororesin, or a washer having a highly slippery resin coating.

Further, as shown in FIG. 4, the spring bearing member 71 is one winding end 29A of the compression coil spring 29.
And the inner end surface 18B of the valve holder 18, and between the other winding end 29B of the compression coil spring 29 and the back surface of the valve body 16, and in this case, the valve holder 18 and When rotating relative to the valve body 16, the inner end surface 18 of the valve holder 18
B and the spring receiving member 71, and / or the valve body 1
Relative rotational friction occurs between 6 and the spring receiving member 71.

As shown in FIG. 5, the convex portion 71B of the spring receiving member 71 may be formed into a spherical shape that engages with the concave portion 18C of the valve holder 18.

Further, as shown in FIG. 6, the spring receiving member 71 is provided with a shallow dish-shaped concave portion 71C, and a member facing this, for example, a shallow dish-shaped convex portion on the inner end surface 18B of the valve holder 18. 18E may be provided and the concave portion 71C and the convex portion 18E may be engaged with each other. In addition, in this embodiment, the winding end 29B of the compression coil spring 29 has a short-axis spring stop portion 16D formed on the back side of the valve body 16 and the other winding end 29B of the compression coil spring 29 has a valve body. It is fitted to the outer circumference of a short shaft-shaped spring stop portion 16D formed on the back surface of 16 and is restrained from moving in the radial direction.

In the embodiment shown in FIG. 7, FIG. 8 and FIG. 9, the spring stop portion 71A of the spring receiving member 71 has its axial length extended to form the extended shaft portion 71D, and the extended shaft portion 71D. 71D
The inner diameter of the compression coil spring 29 is engaged with the outer circumference of the.

In the embodiment, the extension shaft portion 71D of the spring receiving member 71 guides the inner diameter portion of the compression coil spring 29, so that the compression coil spring 29 buckles.
Tilt is prevented, and the operating performance is further improved.

In the embodiment shown in FIG. 10, a shaft center hole 71E is formed in the extension shaft portion 71D of the spring bearing member 71, and the valve body 16 facing the spring bearing member 71 and forming the spring bearing side. The guide shaft-shaped portion 16E is integrally formed with the guide shaft-shaped portion 16E, and the guide shaft-shaped portion 16E is slidably fitted in the shaft center hole 71E.

In this embodiment, since the spring receiving member 71 is moved by being guided by the fitting of the guide shaft-shaped portion 16E and the shaft center hole 71E, the straightness of the movement is improved and the compression coil spring 29 is moved. Buckling and tilting are prevented more reliably, and the operating performance is further improved.

As shown in FIG. 11, when the spring receiving side facing the spring receiving member 71 is on the inner end surface 18B side, the guide shaft-shaped portion 18 is formed on the inner end surface 18B of the valve holder 18.
It suffices that F is integrally formed so that the guide shaft-shaped portion 18F is slidably fitted in the shaft center hole 71E of the spring receiving member 71. Further, as shown in FIG.
When the spring bearing members 71 are arranged on both sides of the shaft bearing hole 71E, the spring bearing member 71 is provided with the shaft center hole 71E and the other spring bearing member 71 is provided with the guide shaft portion 71F. It suffices to slidably fit the shape portion 71F.

In the embodiment shown in FIGS. 13 and 14, the piston-like extended cylindrical portion 71G is fitted into the spring receiving member 71 so as to be slidable in the inner circumference of the valve holder 18 in the axial direction.
Are integrally formed, and the outer diameter portion of the compression coil spring 29 is engaged with the inner circumference of the extension tubular portion 71G.

In the embodiment, the extension cylindrical portion 71G of the spring receiving member 71 guides the outer diameter portion of the compression coil spring 29, so that the compression coil spring 29 buckles.
Tilt is prevented, and the operating performance is further improved. Also,
Since the extension tubular portion 71G is fitted in the inner circumference of the holder 18 so as to be slidable in the axial direction, the straightness of movement of the spring receiving member 71 is improved, and the compression coil spring 29 buckles. Tilt is more reliably prevented.

In the embodiment shown in FIGS. 15 and 16, the tip of the long-axis convex portion 71H of the spring receiving member 71 is formed in a substantially hemispherical shape, and the deep concave portion 16F of the valve body 16 is formed. The bottom is formed in a substantially hemispherical shape, and the convex portion 71H and the concave portion 16F are formed.
And are engaged with each other in a spherical joint manner.

As a result, also in this case, the arrangement position of the compression coil spring 29 in the valve holder 18 is guided to the center, and the mounting concentricity of the compression coil spring 29 is improved, and the relative position between the valve holder 18 and the valve body 16 is improved. Rotational frictional resistance between the valve body 16 and the spring bearing member 71 during rotation is reduced.

As a result, the frictional resistance at the time of opening / closing the valve does not increase, the operating performance is improved, the driving force required for opening / closing the valve is reduced as compared with the conventional one, and the output torque of the stepping motor 40 is reduced. Can be reduced.

As shown in FIG. 16, when the spring bearing members 71 are provided on both sides of the compression coil spring 29, the spherical joint type spring bearing member 71 on the valve body 16 side is The rotation stop pin 73 may prevent the valve body 16 from rotating.

In the embodiment shown in FIG. 17, the tip of the convex portion 71J of the spring receiving member 71 is formed in a substantially conical shape, and the bottom portion of the concave portion 16G of the valve body 16 is formed in a substantially conical shape. The convex portion 71J and the concave portion 16G are engaged with each other in a pivot manner.

As a result, the arrangement position of the compression coil spring 29 in the valve holder 18 is guided to the center, and the mounting concentricity of the compression coil spring 29 is improved, and the valve when the valve holder 18 and the valve body 16 rotate relative to each other. The rotational friction resistance between the inner end surface 18B of the holder 18 or the valve element 16 and the spring bearing member 71 is reduced. As a result, the frictional resistance at the time of opening / closing the valve does not increase, the operating performance is improved, the driving force required for opening / closing the valve is reduced, and the output torque of the stepping motor 40 is reduced as compared with the conventional one. Can be planned.

In the embodiment shown in FIG. 18, the spring receiving member 71 is sandwiched between the one winding end 29A of the compression coil spring 29 and the inner end surface 18B of the valve holder 18 to form a compression coil spring. The winding end 29A of 29 is the spring bearing member 7
1 in a radially restrained state, and the spring receiving member 71 has a convex portion 71B and a concave portion 1 similar to those of the above-described embodiment.
8C engages with the inner end surface 18B of the valve holder 18 in a concavo-convex manner.

On the other winding end 29B of the compression coil spring 29, a protruding line portion 29 is bent in the axial direction at the spring axial center position.
C is bent, and the projecting line portion 29C is inserted and engaged with the central small hole 16H formed in the back surface portion of the valve body 16 facing the projecting line portion 29C.

At the bottom of the central small hole 16H, the steel ball 7 is provided to reduce the frictional resistance between the protruding line portion 29C and the valve body 16.
4 are provided.

According to this embodiment, the spring receiving member 7
1, the arrangement position of the compression coil spring 29 in the valve holder 18 is guided to the center, and the projecting line portion 29C of the compression coil spring 29 is provided at the central small hole 1 on the back surface of the valve body 16.
By engaging with 6H, the other side can be pushed in the center, and the mounting concentricity (centering performance) of the compression coil spring 29 is improved.

As a result, the rotational frictional resistance between the inner end surface 18B of the valve holder 18 and the spring receiving member 71 when the valve holder 18 and the valve body 16 rotate relative to each other is reduced, and the operating performance is improved.
The driving force required for opening and closing the valve is reduced as compared with the conventional one, and the output torque of the stepping motor 40 can be reduced.

As shown in FIG. 19, the compression coil spring 29 is disposed between the lower winding end 29B of the compression coil spring 29 and the rear surface of the valve body 16 on the spring receiving member 71.
An inner end surface 1 of the valve holder 18 in which the protruding line portion 29D is formed by bending the winding end 29A on the upper side of the
It may be inserted and engaged with the central small hole 18H formed in 8B.

In the embodiment shown in FIG. 20, a spring receiving member 71 is provided between one winding end 29A of the compression coil spring 29 and the inner end surface 18B of the valve holder 18 at the tip of the rotor shaft.
, And the winding end 29A of the compression coil spring 29 engages with the spring receiving member 71 in a radially restrained state, and the spring receiving member 71 has the convex portion 7 similar to that of the above-described embodiment.
The inner end surface 18B of the valve holder 18 by 1B and the recess 18C.
Is engaged with the concave and convex portions.

The other winding end 29E of the compression coil spring 29
Has a pick tail end shape, and is in contact with the center of the back surface of the valve body 16 facing the pick tail end.

In this embodiment, the spring receiving member 71 guides the position of the compression coil spring 29 in the valve holder 18 to the center, and the compression coil spring 29 has a winding end 29E having a pick tail end shape. 1
By abutting against the back surface of 6, the other side can be pushed in the center, and the mounting concentricity of the compression coil spring 29 is improved.

As a result, the rotational frictional resistance between the inner end surface 18B of the valve holder 18 and the spring receiving member 71 at the time of relative rotation between the valve holder 18 and the valve body 16 is reduced, and the operation performance is improved.
The driving force required for opening and closing the valve is reduced as compared with the conventional one, and the output torque of the stepping motor 40 can be reduced.

As shown in FIG. 21, a spring receiving member 71 is arranged between the lower winding end 29B of the compression coil spring 29 and the rear surface of the valve body 16, and the compression coil spring 29 is provided.
The upper winding end 29F of the rotor is formed into a pick tail end shape, and the recess 18C of the inner end surface 18B of the valve holder 18 at the tip of the rotor shaft
May be brought into contact with.

Further, as shown in FIGS. 22 and 23, the contact portion (contact partner) of the winding end 29E or 29F having the pick tail end shape of the compression coil spring 29 has a conical convex shape 16J or 18J. , This engagement may be provided with automatic centripetal property.

In the embodiment shown in FIG. 24, the compression coil spring 29 is composed of a conical coil spring, and the spring receiving member 71 is provided between the winding end 29G on the large diameter side and the back surface of the valve body 16. The winding end 2 of the compression coil spring 29 that is sandwiched
9G engages with the spring receiving member 71 in a radially constrained state, and the spring receiving member 71 is provided with a convex and concave portion on the inner end surface 18B of the valve holder 18 by the convex portion 71B and the concave portion 18C as in the above-described embodiment. I am fit.

Winding end 29H on the small diameter side of the compression coil spring 29
Is in contact with a recessed portion 18C at the center of the inner end surface 18B of the valve holder 18 at the tip of the rotor shaft facing it.

In this embodiment, the spring receiving member 71 guides the arrangement position of the compression coil spring 29 in the valve holder 18 to the center, and also the compression coil spring 29.
The winding end 29G on the small diameter side of the valve holder 18 functions similarly to that of the pick-tail end shape and comes into contact with the center of the inner end surface 18B of the valve holder 18 so that the other end can be pushed and the compression coil spring 29 is pressed. Mounting concentricity is improved.

As a result, the rotational frictional resistance between the valve body 16 and the spring receiving member 71 at the time of relative rotation between the valve holder 18 and the valve body 16 is reduced, and the operating performance is improved. The driving force required for opening and closing is reduced, and the stepping motor 4
The output torque of 0 can be reduced.

Further, as shown in FIG. 25, a hemispherical convex portion is formed on the inner end surface 18B of the valve holder 18 at the tip of the rotor shaft where the winding end 29H on the small diameter side of the compression coil spring 29 formed of a conical coil spring faces. 18K, compression coil spring 29
The winding end 29H on the smaller diameter side may be engaged with the hemispherical convex portion 18K to provide automatic centripetal property.

Further, in the embodiment shown in FIGS. 15, 16 and 17, the contact position of the spring receiving member 71 on the valve body side with the valve body 16 and the valve seat member of the valve body 16 when the valve is closed. The distance L between the seat 14 and the seating position is smaller than the diameter D of the valve port 13 at this seating position, and the distance L is made as short as possible.

As a result, it is possible to suppress the occurrence of inclination of the valve element 16 with respect to the valve seat member 14 and reduce valve leakage. Further, uneven wear of the valve seat member 14 due to repeated opening and closing of the valve can be reduced.

[0100]

As can be understood from the above description, according to the electrically operated valve of the present invention, the arrangement position of the compression coil spring in the valve holder is guided to the center by the spring receiving member, and the mounting concentricity of the compression coil spring is provided. Performance is improved, the rotational friction resistance during relative rotation between the valve holder and the valve body is reduced, improving the operating performance, and the driving force required to open and close the valve is reduced compared to the conventional type. The output torque of the motor can be reduced.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of a motor-operated valve according to the present invention.

FIG. 2 is an enlarged vertical sectional view showing a main part of one embodiment of the motor-operated valve according to the present invention.

FIG. 3 is a vertical sectional view showing another embodiment of the motor-operated valve according to the present invention.

FIG. 4 is a vertical cross-sectional view showing an enlarged main part of one embodiment of the motor-operated valve according to the present invention.

FIG. 5 is a vertical sectional view showing another embodiment of the motor-operated valve according to the present invention.

FIG. 6 is a vertical cross-sectional view showing another embodiment of the motor-operated valve according to the present invention.

FIG. 7 is a vertical cross-sectional view showing another embodiment of the motor-operated valve according to the present invention.

FIG. 8 is a vertical sectional view showing another embodiment of the motor-operated valve according to the present invention.

FIG. 9 is a vertical sectional view showing another embodiment of the motor-operated valve according to the present invention.

FIG. 10 is a vertical cross-sectional view showing another embodiment of the motor-operated valve according to the present invention.

FIG. 11 is a vertical sectional view showing another embodiment of the motor-operated valve according to the present invention.

FIG. 12 is a vertical sectional view showing another embodiment of the motor-operated valve according to the present invention.

FIG. 13 is a vertical sectional view showing another embodiment of the motor-operated valve according to the present invention.

FIG. 14 is a vertical cross-sectional view showing another embodiment of the motor-operated valve according to the present invention.

FIG. 15 is a vertical sectional view showing another embodiment of the motor-operated valve according to the present invention.

FIG. 16 is a vertical cross-sectional view showing another embodiment of the motor-operated valve according to the present invention.

FIG. 17 is a vertical sectional view showing another embodiment of the motor-operated valve according to the present invention.

FIG. 18 is a vertical sectional view showing another embodiment of the motor-operated valve according to the present invention.

FIG. 19 is a longitudinal sectional view showing another embodiment of the motor-operated valve according to the present invention.

FIG. 20 is a vertical sectional view showing another embodiment of the motor-operated valve according to the present invention.

FIG. 21 is a longitudinal sectional view showing another embodiment of the motor-operated valve according to the present invention.

FIG. 22 is a vertical cross-sectional view showing another embodiment of the motor-operated valve according to the present invention.

FIG. 23 is a vertical sectional view showing another embodiment of the motor-operated valve according to the present invention.

FIG. 24 is a vertical cross-sectional view showing another embodiment of the motor-operated valve according to the present invention.

FIG. 25 is a vertical sectional view showing another embodiment of the motor-operated valve according to the present invention.

[Explanation of symbols]

10 valve housing 14 valve seat member 16 valve body 18 valve holder 20 holding cylinder 29 Compression coil spring 31 Female thread member 33 Male thread 40 stepping motor 41 rotor shaft 43 rotor 44 rotor case 45 Stator element 52 guide support 53 Hanging cylinder 60 spiral guide wire 63 Movable stopper member 65 Bearing sleeve 71 Spring receiving member

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 3H052 AA01 BA21 CD02 EA16                 3H062 AA02 AA12 BB04 EE08 HH04                       HH09

Claims (15)

[Claims] 1. A valve holder integrated with a rotor shaft of a stepping motor, wherein the valve holder supports a valve element at one end side of the holder so as to be movable in the axial direction and rotatably, and the valve in the valve holder. A compression coil spring is arranged between the back surface side of the body and the other end side of the valve holder, and a male screw portion formed on the rotor shaft is screwed into a female screw hole of a female screw member fixed to the valve housing, In the motor-operated valve in which the rotor shaft is displaced in the axial direction by the screw engagement, and the valve body is opened and closed with respect to the valve seat portion by the axial displacement of the rotor shaft, one winding end of the compression coil spring and A spring bearing member is sandwiched between the inner end surface of the valve holder and / or the other winding end of the compression coil spring and the back surface of the valve body,
The compression coil spring engages with the spring receiving member in a radially restrained state, and the spring receiving member engages with the inner end surface of the valve holder or the back surface of the valve body in a concavo-convex manner and is guided to the center of the valve holder. An electric valve that is characterized by 2. A valve holder integrated with a rotor shaft of a stepping motor, wherein the valve holder supports a valve element on one end side of the holder so as to be movable in the axial direction and rotatably, and the valve in the valve holder. A compression coil spring is arranged between the back surface side of the body and the other end side of the valve holder, and a male screw portion formed on the rotor shaft is screwed into a female screw hole of a female screw member fixed to the valve housing, In the motor-operated valve in which the rotor shaft is displaced in the axial direction by the screw engagement, and the valve body is opened and closed with respect to the valve seat portion by the axial displacement of the rotor shaft, one winding end of the compression coil spring and A spring receiving member is sandwiched between the inner end surface of the valve holder or the other winding end of the compression coil spring and the back surface of the valve body, and the compression coil spring is engaged with the spring receiving member in a radially restrained state. And the above The spring receiving member is engaged with the inner end surface of the valve holder or the back surface of the valve body in a concavo-convex manner so as to be guided to the center of the valve holder. A bent projecting line part is provided, and the projecting line part is engaged with a central small hole formed on the back surface of the valve body or the inner end surface of the valve holder facing the projecting line part. Motorized valve to do. 3. A valve holder integrated with a rotor shaft of a stepping motor, said valve holder supporting a valve element at one end side of the holder so as to be movable in the axial direction and rotatably, and said valve in said valve holder. A compression coil spring is arranged between the back surface side of the body and the other end side of the valve holder, and a male screw portion formed on the rotor shaft is screwed into a female screw hole of a female screw member fixed to the valve housing, In the motor-operated valve in which the rotor shaft is displaced in the axial direction by the screw engagement, and the valve body is opened and closed with respect to the valve seat portion by the axial displacement of the rotor shaft, one winding end of the compression coil spring and A spring bearing member is sandwiched between the inner end surface of the valve holder or the other winding end of the compression coil spring and the back surface of the valve body, and the compression coil spring is radially restrained by the spring bearing member. Engaged, front The spring receiving member engages with the inner end surface of the valve holder or the back surface of the valve body in a concavo-convex manner and is guided to the center of the valve holder, and the other winding end of the compression coil spring forms a pick tail end shape. An electrically operated valve, which is in contact with the center of the back surface of the valve body or the inner end surface of the valve holder facing each other. 4. The contact portion of the pick-up end-shaped winding end of the compression coil spring has a conical convex shape that engages with the pick-tail end-shaped winding end. Motorized valve. 5. A valve holder integrated with a rotor shaft of a stepping motor, wherein the valve holder supports a valve element at one end side of the holder so as to be movable in the axial direction and rotatably, and the valve in the valve holder. A compression coil spring is arranged between the back side of the body and the other end of the valve holder, and a male screw portion formed on the rotor shaft is screwed into a female screw hole of a female screw member fixed to the valve housing, In the motor-operated valve in which the rotor shaft is displaced in the axial direction by the screw engagement, and the valve body is opened and closed with respect to the valve seat portion by the axial displacement of the rotor shaft, one winding end of the compression coil spring and A spring receiving member is sandwiched between the inner end surface of the valve holder or the other winding end of the compression coil spring and the back surface of the valve body, and the compression coil spring is radially restrained by the spring receiving member. Engaged, front The spring bearing member is engaged with the inner end surface of the valve holder or the back surface of the valve body by being concavo-convex and guided to the center of the valve holder, and the winding end of the compression coil spring on the small diameter side of the valve body is opposed thereto. An electrically operated valve, which is in contact with the center of the back surface or the inner end surface of the valve holder. 6. A winding end on the small diameter side of the compression coil spring, wherein a hemispherical convex portion is formed on the back surface of the valve body or the inner end surface of the valve holder, to which the winding end on the small diameter side of the compression coil spring faces. 6. The motorized valve according to claim 5, wherein is engaged with the hemispherical convex portion. 7. The motor-operated valve according to claim 1, wherein the spring bearing member has an extension shaft portion that guides an inner diameter portion of the compression coil spring. 8. An axial center hole is formed in the extension shaft-shaped portion of the spring bearing member, and a guide shaft-shaped portion extendedly formed on the spring bearing side facing the spring bearing member is axially formed in the shaft center hole. 8. The sliding member is slidably fitted to the
Motorized valve described. 9. The motor-operated valve according to claim 1, wherein the spring receiving member has an extending cylindrical portion that guides an outer diameter portion of the compression coil spring. . 10. The uneven engagement between the spring receiving member and the inner end surface of the valve holder or the back surface of the valve body is a planar engagement by a shallow dish-like unevenness.
The motor-operated valve according to any one of 1 to 9. 11. The concavo-convex engagement between the spring receiving member and the inner end surface of the valve holder or the back surface of the valve body is spherical engagement due to a substantially hemispherical concavity and convexity. The motor-operated valve according to any one of 9 above. 12. The concavo-convex engagement between the spring receiving member and the inner end surface of the valve holder or the back surface of the valve body is a pivotal engagement due to a substantially conical concavo-convex shape. The motor-operated valve according to any one of 9 above. 13. The valve at this seating position is the distance between the contact position of the spring receiving member provided on the valve body side with the valve body and the seating position of the valve body with the valve seat member when the valve is closed. The motor-operated valve according to any one of claims 1 to 12, which is smaller than a port diameter. 14. The valve holder and the valve body have thrust surfaces facing each other, and a thrust bearing is sandwiched between the thrust surfaces.
The motor-operated valve according to any one of 3 above. 15. The motorized valve according to claim 14, wherein the thrust bearing is a metal washer having a highly slippery surface, a washer made of a highly slippery resin, or a washer having a highly slippery resin coating.