JP2010096203A - Motor operated valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor operated valve which can highly accurately position an origin, suppress a vibration (resonance of stopper) or a drive noise generated in driving, and also manufacture a spiral stopper at a low cost without requiring more strict dimension control or the like. <P>SOLUTION: A stopper mechanism 90 includes: a spiral stopper 91 having a winding number of three or more; and a ring-like or spiral slider 92 which is contained in the spiral part of the spiral stopper 91, and held with holding parts 91a and 91b provided around the vertical end of the spiral stopper 91 by rising and falling while rotating along the spiral part with the rotation of a rotor 30. In the spiral stopper 91, both the ends are retained or secured in the state of compression. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an electric valve driven by a stepping motor that is used as a flow control valve or the like in a refrigeration cycle such as an air conditioner or a refrigerator.

  As an electric valve used by being incorporated in an air conditioner, a refrigerator, or the like, a valve as shown in FIG. 8 is considered by the inventors of the present application (see also Patent Document 1 below).

  The motor-operated valve 10 ′ shown in FIG. 8 includes a valve body 70 having a valve chamber 71. The valve body 70 includes a valve seat member 72 having a valve opening 72a having a circular cross section and a conical valve seat 72b, and a cylindrical valve chamber forming member 74 with a can receiving collar portion 74a. A lower end portion of a bottomed cylindrical can 40 having a lower opening is sealed and joined to the can receiving rod-shaped portion 74a of the forming member 74 by butt welding, and a fluid such as a refrigerant by a valve body 61 that contacts and separates from the valve seat 72b. The passage flow rate is adjusted.

  A refrigerant inlet / outlet first conduit (joint) 41 is provided on one side of the valve chamber 71 of the valve body 70, and a refrigerant inlet / outlet second conduit (joint) is provided below the valve chamber 71. 42 are connected and fixed by brazing or the like.

  A rotor 30 is arranged on the inner periphery of the can 40 with a predetermined gap. Although not shown on the outer periphery of the can 40 to rotate the rotor 30, a yoke, a bobbin, and A stator composed of a stator coil or the like is disposed, and the rotor 30 and the stator constitute a stepping motor.

  Further, on the inner peripheral side of the rotor 30, a valve shaft 60 (also referred to as a rotor shaft, which is a rotating shaft of the rotor 30) integrally connected to the rotor 30 via a nut member 62, and the valve shaft 60 And a guide stem 80 having a cylindrical portion 81 in which is inserted.

  At the lower end of the cylindrical portion 81 of the guide stem 80, a concave connecting and holding bottom surface portion 82 is provided integrally for positioning for increasing the coaxiality between the valve main body 70 and the can 40.

  On the other hand, the upper end portion of the cylindrical valve holder 55 is press-fitted and fixed to the lower end portion of the large diameter of the valve shaft 60. The valve holder 55 is held and fixed to the valve shaft 60 and is slidably inserted into the cylindrical portion 81 of the guide stem 80.

  The valve shaft 60, the valve holder 55, the valve body 61 and the like are configured as one assembly (hereinafter referred to as a valve shaft assembly 50), and the valve body 61 is attached to the valve shaft 60 at the lower end portion of the valve holder 55. The shaft is inserted so as to be capable of relative movement and rotation in the axial direction, and is latched and locked by a cylindrical locking portion 63 described later.

  The valve body 61 is locked by a base 61A having a conical valve portion 61a seated on the valve seat 72b, and a cylindrical locking portion 63 that is fixed to the lower end portion of the valve holder 55 by a technique such as press-fitting or welding. The base 61A includes a hook-like hooking member 66 which is a separate part. The base body 61A of the valve body 60 has, in order from the bottom, a conical valve portion 61a, a body portion 61b having a diameter smaller than the outer diameter of the upper portion (bottom surface portion) of the conical valve portion 61a, and a diameter smaller than the outer diameter of the body portion 61b. The outer diameter of the upper portion (bottom surface portion) of the conical valve portion 61a on the upper end surface (the terrace surface formed between the cylindrical portion 61c) of the trunk portion 61b, which has a caulking portion (being a cylindrical portion) 61c. A hook-shaped hooking member 66 having a smaller outer diameter and formed in a ring shape having a rectangular cross section is fixed by caulking the cylindrical portion 61c. The hook-shaped hooking member 66 is also a spring receiver that receives the lower end of the coil spring 64.

  A spring receiving ball 65 is disposed on the lower side of the valve shaft 60 in the valve holder 55, and between the spring receiving ball 65 and the valve body 61, a valve cutoff for urging the valve body 61 downward is provided. A compression coil spring 64 for buffering is also mounted.

  In addition to the above, a screw feed mechanism 16 for bringing the valve body 61 into and out of contact with the valve seat 72b is provided. The screw feed mechanism 16 is a female screw that is internally fitted and fixed to the cylindrical portion 81 of the guide stem 80. A fixed screw portion (female screw portion) 28 formed on the inner periphery of the member 85 and a movable screw portion (male screw portion) 29 formed on the outer periphery of the central portion of the valve shaft 60 and screwed into the fixed screw portion 28. It is made up of.

  Therefore, in the motor-operated valve 10 having such a configuration, when the rotor 30 is rotated, the valve shaft 60 (valve shaft assembly 50) is rotated integrally therewith. At this time, the valve shaft 60 is moved by the screw feed mechanism 16 to the valve shaft 60. The body 61 is moved up and down, thereby adjusting the flow rate of the refrigerant.

  Further, a stopper mechanism 67 for defining the origin for rotating and raising the rotor is disposed on the outer periphery of the guide stem 80. The stopper mechanism 67 is incorporated in a spiral stopper 68 and a spiral portion of the spiral stopper 68, and moves up and down while rotating along the spiral portion with the rotation of the rotor 30. It consists of a ring-shaped or spiral slider 69 that is locked by locking portions 68a and 68b provided in the vicinity of the ends.

  More specifically, as shown in FIG. 9A, the spiral stopper 68 is, for example, a coil spring having an effective number of turns of 5.5 (5 and a half turns) and a winding direction on the right. Or an upper locking portion 68a bent upward from the spiral portion, and its lower end bent downward from the spiral portion. It is set as the side latching | locking part 68b. Further, as shown in FIG. 9 (B), the slider 69 has a coil spring having an effective number of turns of 1.5 (one and a half turns) and a winding direction on the right (a spirally wound wire or a synthetic resin). The upper end portion of the material is a side protrusion contact portion 69a bent sideways from the spiral portion, and the lower end (end) of the spiral portion is an end surface contact formed on a flat surface. This part 69b is used.

  Although the diameter of the wire forming the slider 69 is slightly larger than the diameter of the wire forming the spiral stopper 68, the pitch of the slider 69 and the pitch of the spiral stopper 68 are the same. The spiral stopper 68 (lower locking portion 68b) is fixed to the connecting and holding bottom surface portion 82 of the guide stem 80, and the slider 69 is incorporated in the spiral portion of the spiral stopper 68 as shown in FIG. It can be moved up and down (spiral motion) while rotating along the spiral portion.

  The side projecting contact portion 69a of the slider 69 is pushed by a vertically long pushing plate portion 39 projecting from the inner periphery of the rotor 30 when the rotor 30 rotates (both forward and reverse). It has become so. Therefore, when the rotor 30 is rotated clockwise in plan view, the slider 69 descends while rotating in the same direction, and finally the position where it is most lowered in FIG. 10 (descent limit position = origin position) is a solid line. As shown, the end face contact portion 69b is brought into contact with and locked against the lower locking portion 68b of the spiral stopper 68, whereby the rotation and lowering of the rotor 30 are forcibly stopped. When the rotor is rotated counterclockwise in plan view, the slider 69 rises while rotating in the same direction, and finally, the most elevated position (rising limit position) in FIG. 10 is indicated by a virtual line. As shown, the laterally projecting contact portion 69a is brought into contact with the upper locking portion 68a of the spiral stopper 68 and locked, thereby forcibly stopping the rotation and raising of the rotor 30.

  In the motor-operated valve 10 according to the present embodiment having such a configuration, the rotor 30 and the valve shaft assembly 50 are rotated in one direction by energizing and exciting the stator in the first mode (pulse supply). The valve shaft assembly 50 is moved downward by the screw feed mechanism 16 including the fixed screw portion (female screw portion) 28 and the movable screw portion (male screw portion) 29, and the valve body 61 is seated on the valve seat 72b. The mouth 72a is closed.

  When the valve port 72a is closed, the slider 69 is not yet in contact with the spiral stopper 68, and the rotor 30, the valve shaft 60, and the valve holder 55 further rotate while the valve body 61 closes the valve port 72a. Descend. At this time, since the valve shaft 60 and the valve holder 55 are lowered while being integrally rotated with respect to the valve body 61, the compression coil spring 64 is further compressed, and thereby the lowering force of the valve shaft 60 and the valve holder 55 When the valve body 61 is pressed against the valve seat 72b and then the rotor 30 is further rotated, the slider 69 comes into contact with the spiral stopper 68, and the valve shaft 60 and the valve holder 55 are moved to the lowest position. Even when the pulse supply to the stator is continued, the lowering of the valve shaft 60 and the valve holder 55 is forcibly stopped, and the valve is closed (fully closed).

  Here, when the valve shaft 60 and the valve holder 55 are in the lowest lowered position (fully closed state) as shown in FIG. 8, the urging force of the compression coil spring 64 causes the valve body 61 to be hooked. It is strongly pressed against the valve seat 72b via the member 66, and at this time, a predetermined gap is formed between the lower end surface of the hook-shaped hooking member 66 and the upper end surface of the cylindrical locking portion 63.

  On the other hand, when the stator is energized and excited (pulse supply) in the second mode from this fully closed state, the rotor 30 and the valve shaft assembly 50 are rotated in the opposite direction to the above, and the fixed screw portion (female screw portion) 28 and The valve shaft 60 and the valve holder 55 are now moved upward while rotating with respect to the valve body 61 by the screw feed mechanism 16 including the movable screw portion (male screw portion) 29. Here, since there is a predetermined gap between the lower end surface of the hook-shaped hooking member 66 and the upper end surface of the cylindrical locking portion 63, the valve shaft 60 and the valve holder 55 are moved from the lowest position by a predetermined amount. When rotated, the lower end surface of the hook-shaped latching member 66 and the upper end surface of the cylindrical locking portion 63 abut. When the valve shaft 60 and the valve holder 55 are further rotated and raised from this contact point, the valve body 61 is pulled up and the valve is opened while the cylindrical locking portion 63 engages the hook-like hooking member 66.

  In the motor-operated valve 10 'described above, the valve body 70 (the valve chamber forming member 74) serves as a guide member for moving the slider 69 up and down (spiral motion) while rotating along the spiral portion of the spiral stopper 68. The cylindrical portion 81 of the guide stem 80 that guides the axial movement of the valve shaft assembly 50 or the rotation of the valve shaft assembly 50 that is fixed to the cylinder is used. However, the present invention is not limited to this. As can be seen, a cylindrical guide member may be provided on the lower surface of the ceiling of the can (rotor case) and a spiral stopper may be disposed on the outer periphery of the guide member in order to cause the slider to spirally move.

JP 2006-112617 A JP 2003-329158 A

  In the conventional motor-operated valve as described above, the helical stopper constituting the stopper mechanism is arranged in a natural state (extended state) without being substantially compressed. In other words, one end side is fixed to a non-moving part (for example, the connection holding bottom surface part 82 of the guide stem 80), but since the other end side is free (free end), the free end side is easily twisted, misalignment, etc. It is easy to invite. Therefore, (A) the accuracy of the origin search is low, the origin is likely to be displaced, (B) the stopper resonates due to vibration generated during driving, and the driving sound is increased. (C) The variation in the helical pitch of the stopper is within a certain range. Therefore, there is a problem that manufacturing of the stopper requires strict dimensional control and the manufacturing cost is high.

  The present invention has been made in view of such circumstances, and an object of the present invention is to perform origin finding with high accuracy and to suppress vibration (stopper resonance) and driving sound generated during driving. Another object of the present invention is to provide a motor-operated valve which can be manufactured at a low cost without requiring a strict dimensional control or the like.

  In order to achieve the above-mentioned object, the motor-operated valve according to the present invention basically includes a rotor on the inner periphery of the can and an outer stator that excites the rotor on the outer periphery of the can and rotationally drives it. The valve body having a valve chamber for allowing fluid to enter and exit and a valve seat for contacting and separating the valve body is connected to the can, and the valve opening degree of the valve body relative to the valve seat is controlled by the rotation of the rotor And a stopper mechanism for defining the origin position of the rotor, the stopper mechanism being incorporated in a spiral stopper having three or more windings, and a spiral portion of the spiral stopper, and as the rotor rotates, A ring-shaped or spiral slider that is moved up and down while rotating along the spiral portion and is locked by locking portions provided near the upper and lower ends of the spiral stopper; Both ends in the compressed state is characterized by being held to a fixed.

  In a preferred embodiment, a guide member on which the helical stopper is extrapolated is fixed to the can or the valve body so as to raise and lower the slider while rotating along the helical portion.

  In another preferred embodiment, one end side of the spiral stopper is fixed to the non-moving portion by welding or the like, and the other end side is pressed and held by the non-moving portion.

In another preferred embodiment, a screw feed mechanism for moving the valve body up and down includes a fixed screw portion formed on an inner periphery of a female screw member fitted and fixed to a cylindrical portion of the guide member, and a central portion of the valve shaft. It is composed of a movable screw portion formed on the outer periphery and screwed into the fixed screw portion, and the helical stopper is provided at a press holding member provided at the female screw member and a lower end portion of the guide member. It is arranged in a compressed state between the connected bottom portion for holding.
The pressing holding member is preferably provided integrally with the female screw member.

  The pressing holding member is preferably integrally fixed to the outer periphery of the female screw member by press fitting, welding or the like.

  The pressing holding member is preferably constituted by a retaining ring such as an E-shaped ring or a C-shaped ring mounted on the outer periphery of the female screw member.

  In the motor-operated valve of the present invention, the helical stopper of the stopper mechanism is held or fixed at both ends in the compressed state, so that twisting and positional deviation are less likely to occur, and the origin search can be performed with high accuracy. It is possible to suppress vibration (stopper resonance) and driving sound that occur during driving.

  In addition, since the rigidity of the spiral stopper itself is increased by making the compression state, the wire diameter of the stopper can be reduced and the occupied space can also be reduced, so that cost reduction, size reduction, weight reduction, etc. can be achieved. Can be planned.

  Furthermore, since the variation in the helical pitch is reduced by adopting the compressed state, the helical pitch (the dimensional accuracy thereof) may be relatively rough at the time of manufacturing the stopper (the natural state when it is not compressed), Therefore, strict dimensional management or the like is not necessary, and the stopper mechanism can be manufactured at a low cost.

Hereinafter, embodiments of the motor-operated valve of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram showing a first embodiment of a motor-operated valve according to the present invention.

  In the motor-operated valve 10A shown in FIG. 1, parts corresponding to the parts of the motor-operated valve 10 ′ shown in FIG. 8 described above are denoted by the same reference numerals, and redundant description thereof will be omitted. Explain the point with emphasis.

  In the motor-operated valve 10 </ b> A of the present embodiment, the stopper mechanism 90 that is extrapolated to the cylindrical portion 81 of the guide stem 80 and defines the origin for rotation of the rotor 30 is a spiral stopper 91 and a spiral of the spiral stopper 91. As the rotor 30 rotates, it moves up and down (spiral motion) while rotating along the spiral portion, and is engaged by locking portions 91a and 91b provided near the upper and lower ends of the spiral stopper 91. The helical stopper 91 includes a large-diameter columnar pressure holding portion 86 provided integrally with the female screw member 85 and a connection holding provided at the lower end portion of the guide stem 80. It is arranged in a compressed state with the bottom surface portion 82, and one end side (lower end side) thereof is fixed to the non-moving portion (the bottom portion 82 for connection and holding) by welding or the like, and the other end side (upper end side) is pressed. By holding part 86 It is pressed and held.

  More specifically, the spiral stopper 91 has, for example, an effective winding number of 6.5 (six windings and a half) and a winding direction as shown in FIGS. Is the right coil spring (synthetic resin material spirally formed), and the upper locking portion 91a (non-spiral connecting portion extending in the length direction) between the uppermost level (horizontal level) and the lower level ) Is formed, and a lower locking portion 91b (a non-spiral connecting portion extending in the length direction) is formed between the lowermost level (horizontal level) and the upper level, and is further fixed downward from the lowermost level. A projecting portion 91c is formed.

  For example, the helical stopper 91 is fixed by passing the fixing protrusion 91c through a locking hole (not shown) formed in the connection holding bottom surface portion 82 of the guide stem 80, and the lowermost step is connected and held. When the female screw member 85 integrally provided with the pressing holding portion 86 is press-welded and fixed to the cylindrical portion 81 of the guide stem 80 in a state of being in contact with the bottom surface portion 82, the pressing holding portion 86 presses the uppermost stage. And it is incorporated by compressing the whole. This compressed state is shown in FIG.

  On the other hand, as shown in FIGS. 5A to 5C, the slider 92 is a coil spring (synthetic resin material is spirally formed with an effective number of turns of 1.5 (one and a half turns) and a winding direction on the right. The upper end of the spiral portion is a side protruding contact portion 92a that is bent sideways from the spiral portion, and the lower end (end) of the spiral portion is an end surface contact portion 92b formed on a flat surface.

  The wire diameter of the slider 92 and the wire diameter of the spiral stopper 91 are the same (however, thinner than those of the conventional example), and the pitch of the slider 92 and the pitch of the spiral stopper 91 in the compressed state (in an assembled state) are It is the same. As shown in FIG. 6, the slider 92 is incorporated in a spiral portion of the spiral stopper 91 and can move up and down (spiral motion) while rotating along the spiral portion. At this time, the cylindrical portion 82 of the guide stem 80 functions as a rotation raising / lowering guide portion of the slider 92.

  The side protrusion contact portion 92 a of the slider 92 is pushed by a vertically long push plate portion 39 that protrudes from the inner periphery of the rotor 30 when the rotor 30 rotates (both forward and reverse). It has become so. Therefore, when the rotor 30 is rotated clockwise in plan view, the slider 92 descends while rotating in the same direction, and finally the position where it descends most in FIG. 6 (descent limit position = origin position) is the one-dot chain line. As shown, the end face contact portion 92b is brought into contact with and locked against the lower locking portion 91b of the spiral stopper 91, whereby the rotation and lowering of the rotor 30 are forcibly stopped. When the rotor is rotated counterclockwise in plan view, the slider 92 rises while rotating in the same direction, and finally, the most elevated position (rising limit position) is shown by a two-dot chain line in FIG. As shown, the side protrusion contact portion 92a is brought into contact with and locked to the upper locking portion 91a of the spiral stopper 91, thereby forcibly stopping the rotation and raising of the rotor 30.

  In this embodiment, the upper end side of the spiral stopper 91 is only pressed and held by the pressing holding portion 86, but even in this state, no twisting or the like occurs when the slider 92 is contacted and locked. . For example, as shown in FIG. 7, a fixing protrusion 91d is provided upward from the uppermost stage, and a locking hole or the like for inserting the fixing protrusion 91d is provided as a fixed portion (press-holding). Part 86 etc.).

  In the present embodiment, a spherical crown spring receiving member 66 is used instead of the conventional spring receiving ball 65 for the purpose of shortening the length (height) of the valve shaft assembly 50 or the like. .

  As described above, since both ends of the helical stopper 91 of the stopper mechanism 90 of the present embodiment are held or fixed in the compressed state, it is difficult to cause torsion and positional deviation, and the origin search is performed with high accuracy. In addition, vibration (stopper resonance) and driving sound generated during driving can be suppressed.

  In addition, since the rigidity of the spiral stopper itself is increased by making the compression state, the wire diameter of the stopper can be reduced and the occupied space can also be reduced, so that cost reduction, size reduction, weight reduction, etc. can be achieved. Can be planned.

  Furthermore, since the variation in the helical pitch is reduced by adopting the compressed state, the helical pitch (the dimensional accuracy thereof) may be relatively rough at the time of manufacturing the stopper (the natural state when it is not compressed), Therefore, strict dimensional management or the like is not necessary, and the stopper mechanism can be manufactured at a low cost.

  In addition, in the said embodiment, although the press holding member 86 is integrally provided in the internal thread member 85, it is not restricted to this, As FIG. 2 shows the motor operated valve 10B of 2nd Embodiment, it is separate. A bottomed cylindrical pressing and holding member 87 may be prepared, and this may be integrally fixed to the outer periphery of the female screw member 85 by press fitting, welding, or the like. Furthermore, FIG. As shown in the valve 10 </ b> C, a circumferential groove 89 is formed on the outer periphery of the female screw member 85, and a retaining ring 88 such as an E-shaped ring or a C-shaped ring as a pressure holding member is attached to the circumferential groove 89. You may do it.

  In the above embodiment, the screw feed mechanism 16 causes the valve element 61 to contact and separate from the valve seat 72 as the rotor 30 rotates, thereby controlling the valve opening (lift amount). However, the present invention is not limited to such a configuration, and can be applied to a motor-operated valve in which the valve opening degree is controlled using means other than the screw feed mechanism.

The longitudinal cross-sectional view of the principal part except the stator of 1st Embodiment of the motor operated valve which concerns on this invention. The longitudinal cross-sectional view of the principal part except the stator of 2nd Embodiment of the motor operated valve which concerns on this invention. The longitudinal cross-sectional view of the principal part except the stator of 3rd Embodiment of the motor operated valve which concerns on this invention. FIGS. 1 to 3 show a helical stopper of the stopper mechanism of the electric valve shown in FIGS. 1 to 3, (A), (B) and (C) are a top view, a side view and a bottom view in a natural state, and (D) is a compression The side view in a state. The slider of the stopper mechanism of the electrically operated valve shown in FIGS. 1 to 3 is shown, and (A), (B), and (C) are a top view, a side view, and a bottom view in a natural state. The figure which is provided for operation | movement description of the stopper mechanism of the electrically operated valve shown by FIGS. The figure which is provided for description of the other example of the stopper mechanism of the electric valve shown in FIGS. The longitudinal cross-sectional view of the principal part which shows an example of the conventional motor operated valve. The figure which shows the spiral stopper (A) and slider (B) which comprise the stopper mechanism of the electrically operated valve shown by FIG. FIG. 10 is a diagram for explaining the operation of the rotation regulating stopper mechanism shown in FIG. 9.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Electric valve 16 Screw feed mechanism 30 Rotor 28 Fixed screw part 29 Movable screw part 40 Can 50 Valve shaft assembly 55 Valve holder 60 Valve shaft 61 Valve body 70 Valve main body 71 Valve chamber 72 Valve seat 72a Valve port 72b Valve seat 74 Valve Chamber forming member 80 Guide stem 81 Cylindrical portion 82 Connection holding bottom surface portion 85 Female screw member 86 Press holding portion 90 Stopper mechanism 91 Spiral stopper 92 Slider

Claims (7)

A rotor is embedded on the inner periphery of the can, and a stator for exciting and rotating the rotor on the outer periphery of the can is externally fitted. A valve chamber and a valve body through which fluid enters and leaves are connected to and separated from the can. A valve body having a valve seat that is connected, and a valve opening degree of the valve body with respect to the valve seat is controlled by rotation of the rotor, and an electric valve including a stopper mechanism that defines an origin position of the rotor ,
The stopper mechanism includes a spiral stopper having three or more turns, and is moved up and down while rotating along the spiral portion as the rotor is rotated. Including a ring-shaped or spiral slider that is locked by a locking portion provided near the end,
The motor-operated valve characterized in that both ends of the spiral stopper are held or fixed in a compressed state.   2. The electric motor according to claim 1, wherein a guide member on which the spiral stopper is extrapolated is fixed to the can or the valve body so as to raise and lower the slider while rotating along the spiral portion. valve.   The motor-operated valve according to claim 1 or 2, wherein one end side of the spiral stopper is fixed to the non-moving portion by welding or the like, and the other end side is pressed and held by the non-moving portion.   A screw feed mechanism for driving the valve body to move up and down is formed on a fixed screw portion formed on an inner periphery of a female screw member fitted and fixed on a cylindrical portion of the guide member, and on an outer periphery of a central portion of the valve shaft. A movable screw portion screwed into the fixed screw portion, and the helical stopper is a press holding member provided on the female screw member and a connecting and holding bottom surface portion provided on a lower end portion of the guide member. The motor-operated valve according to claim 2, wherein the motor-operated valve is arranged in a compressed state between the motor-operated valve and the motor-operated valve.   The motor-operated valve according to claim 4, wherein the pressing holding member is provided integrally with the female screw member.   The motor-operated valve according to claim 4, wherein the pressing holding member is integrally fixed to the outer periphery of the female screw member by press fitting, welding, or the like.   5. The motor-operated valve according to claim 4, wherein the pressing and holding member is constituted by a retaining ring such as an E-shaped ring and a C-shaped ring mounted on an outer periphery of the female screw member.

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