JP2012062952A - Motor-operated valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor-operated valve achieving replacement of an internal component while ensuring required airtightness.SOLUTION: A stator 50 is fastened and fixed to a valve body 10 by bolts 60 so that the internal component 15 constituted of a can 40, a rotor 30, a valve stem 25, a valve seat member 17, a receiving member 16, a screw feed mechanism 18 and the like is press-sandwiched by the stator 50 and valve body 10.

Description

  The present invention relates to a motor-operated valve that is used in a car air conditioner or the like, and in particular, an electric motor that enables replacement of internal machine parts (cans, receiving members, mechanism parts distributed inside the cans, etc.). Regarding the valve.

  As an electric valve incorporated and used in a car air conditioner or the like, for example, as seen in the following Patent Document 1 or the like, a valve shaft having a valve body provided at a lower end portion and a valve seat (valve) in which the valve body is in contact with or separated from the valve shaft (valve) Port), inflow port, outflow port, valve chamber and the like provided with a valve body, a can attached and fixed to the valve body, a rotor disposed with a predetermined gap around the inner periphery of the can, A stator externally fitted to the can for rotationally driving the rotor, and a drive mechanism that is disposed between the rotor and the valve shaft and that opens and closes the valve body by utilizing the rotation of the rotor. There is known one that adjusts the flow rate of a fluid such as a refrigerant by controlling the lift amount of the valve body.

JP 2008-249148 A

  In the conventional motor-operated valve as described above, the lower end portion of the can is welded to the receiving member to secure the required airtightness, and the receiving member is fixed to the valve body by press fitting, caulking, welding, brazing, etc. Has been. For this reason, it is difficult to separate internal machine parts (cans, receiving members, mechanical parts distributed inside the cans, etc.) from the valve body, and it is impossible to replace the internal machine parts even if they break down. .

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a motor-operated valve that enables replacement of internal machine parts while ensuring required airtightness.

  In order to achieve the above object, an electric valve according to the present invention basically includes a receiving member, a can that defines a predetermined space with the receiving member, a valve shaft disposed in the space, Accommodates a rotor that rotates a valve shaft, and an internal machine component that includes a drive mechanism that converts the rotation of the rotor into advancing and retreating of the valve shaft with respect to a valve seat; a stator that is externally fitted to the can; and the receiving member And a valve body provided with an inlet and an outlet communicating with the insertion hole, and the stator presses and fixes the inner machine component against the valve body. It is characterized by being screwed to the main body.

The valve seat is preferably provided on the receiving member.
The valve seat is preferably provided in the valve body.

  In another preferred aspect, the stator presses the top of the can toward the valve body by the screwing.

In another preferred embodiment, the can is fixed to the receiving member.
In another preferred embodiment, the can is welded to the receiving member.

  Further, in the configuration of the motor-operated valve in which the valve seat is provided on the receiving member, the stator presses the top of the can toward the valve body by the screwing, and the receiving member is attached to the can. The welded portion and the portion where the valve seat is formed are configured as separate parts.

  In the above-described basic motor-operated valve configuration, the can includes a hook-shaped bottom portion that contacts the receiving member at a lower end thereof, and the stator has a convex portion that contacts the hook-shaped bottom portion at a lower portion thereof. The convex portion presses the bowl-shaped bottom portion by the screwing of the stator.

  Further, the can can be integrated with the can as an insert at the time of molding.

  In each of the motor-operated valves described above, a sealing material is disposed between the internal machine component and the valve body.

  In the electric valve according to the present invention, the stator is screwed and fixed to the valve main body, and the internal machine parts are pressed and clamped between the stator and the valve main body. Therefore, if the screwed portion is loosened, The stator is separated from the main body, and at the same time, the internal machine parts can be extracted from the valve main body by releasing the pressing and holding state between the valve main body and the stator. Moreover, the required airtightness can be ensured by disposing a sealing member such as an O-ring between the internal machine component and the valve body.

  Therefore, according to the present invention, it is possible to replace the internal machine parts while ensuring the required airtightness.

The top view which shows 1st Example of the motor operated valve which concerns on this invention. The front view of the motor operated valve of 1st Example. The XX arrow expanded sectional view of FIG. The top view which shows 2nd Example of the motor operated valve which concerns on this invention. The front view of the motor operated valve of 2nd Example. The YY arrow expanded sectional view of FIG.

Embodiments of the present invention will be described below with reference to the drawings.
1 is a plan view showing a first embodiment of a motor-operated valve according to the present invention, FIG. 2 is a front view of the motor-operated valve according to the first embodiment, and FIG. 3 is an enlarged sectional view taken along line XX in FIG. It is.

  The motor-operated valve 1 of the illustrated first embodiment basically includes a cylindrical can 40 having a lower opening having a ceiling portion 40 a for defining a predetermined space with the receiving member 16, and the can 40. Rotor 30 arranged with a predetermined gap α on the inner periphery thereof, stator 50 fitted on can 40, valve shaft 25 on which valve body 24 is provided at the lower end, and lower end of can 40 A receiving member 16 that receives the valve portion, a valve seat member 17 having a valve seat (valve port) 23, a rectangular parallelepiped valve body 10 provided with an inlet 11, an outlet 12, and a valve chamber 14, and a rotor 30 And a screw feed mechanism 18 as a drive mechanism that is arranged between the valve shaft 25 and moves the valve body 24 to and away from the valve seat 23 by using the rotation of the rotor 30. Adjust the flow rate of fluid such as refrigerant by controlling the lift amount It has become way.

  In the motor-operated valve 1 according to the present embodiment, the internal machine component 15 including the can 40, the rotor 30, the valve shaft 25, the receiving member 16, the valve seat member 17, the screw feeding mechanism 18, and the like includes the stator 50 and the valve body 10. The stator 50 is fastened and fixed to the valve main body 10 with four bolts 60 so as to be pressed and clamped.

Hereinafter, each part will be described in detail.
The stator 50 includes a yoke 51, a bobbin 52, coils 53 and 53, a cover 58, a mold cover 56 surrounding them, and the like. The stator 50 and the rotor 30 constitute a stepping motor.

  The mold cover 56 has a convex outer shape in cross section, a cylindrical ceiling portion 56a fitted on the upper portion including the ceiling portion 40a of the can 40, a stator such as a yoke 51, a bobbin 52, and coils 53 and 53. A cylindrical body 56b surrounding the main part, and a relatively thick extending bottom part 56c extending in the radial direction (front-rear direction) from the lower end of the cylindrical body 56b. The ceiling portion 56a abuts on and presses the ceiling portion 40a of the can 40 downward, and the extended bottom portion 56b has a plan view outer shape (vertical and horizontal dimensions) that is different from that of the upper surface portion 10a of the valve body 10. The rectangular shapes are substantially the same (size), and through holes 61 through which the bolts 60 are passed are formed in the vicinity of the four corners.

  The four bolts 60 are respectively screwed into the female screw portions 62 formed in the vicinity of the upper four corners of the valve body 10 through the through holes 61, and the extended bottom portion 56c is fastened and fixed to the upper surface portion 10a of the valve body 10. Thus, the motor-operated valve 1 of the present embodiment is assembled.

  The receiving member 16 has a stepped cylindrical shape composed of a bowl-shaped portion 16a and a body portion 16b, and a lower end portion of the can 40 on a terrace (stepped portion) formed on an upper outer peripheral edge of the bowl-shaped portion 16a. Are welded (welded portion 42). A large-diameter lower portion 26a of the guide bush 26 is press-fitted and fixed in the fitting recess 43 formed in the upper portion of the receiving member 16, and the hook-shaped portion 17a and the fitting recess 44 are formed in the lower portion of the receiving member 16. A flange-shaped portion 17a of a cylindrical valve seat member 17 formed of a body portion 17b is fixed by press-fitting or the like, and the receiving member 16 and the valve seat member 17 are integrally separated. Here, the receiving member 16 is made of a material having high weldability with the can 40, and the valve seat member 17 that is not welded is made of a material having good cutting properties. The seat member 17 may be formed of the same material, and further, they may be integrally formed. The valve seat member 17 is formed with a horizontal hole 17 c that opens to the valve chamber 14 on the upstream side of the valve seat 23, and a vertical hole 17 d that is formed on the downstream side of the valve seat 23.

  The valve body 10 is made of, for example, aluminum die casting, and has a stepped inner portion in which the lower part of the internal machine part 15 (the lower part of the can 40, the receiving member 16, the valve seat member 17) is inserted and locked. An insertion hole 13 is provided. The insertion hole 13 has an upper large-diameter hole 13a opened in the upper surface portion 10a of the valve body 10 in order from the top, with the rotation axis O of the rotor 30 as a center line, and a first intermediate having a smaller diameter than the upper large-diameter hole 13a. The hole 13b includes a second intermediate hole 13c having a diameter smaller than that of the first intermediate hole 13b, and a lower small diameter hole 13c having a diameter smaller than that of the second intermediate hole 13c.

  An O-ring 45 is interposed between the first intermediate hole 13 b in the insertion hole 13 and the receiving member 16 so as to be compressed in the vertical direction by the flange-shaped portion 16 a of the receiving member 16. The outer surface of the O-ring 45 is in strong pressure contact with a total of four surfaces including the outer peripheral surface of the trunk portion 16b of the receiving member 16 and the lower surface of the bowl-shaped portion 16a, and the inner peripheral surface and the bottom surface (step surface) of the first intermediate hole 13b. Thus, the space between the internal machine component 15 and the valve body 10 is sealed.

  The body portion 16b of the receiving member 16 is fitted into the second intermediate hole 13c in the inner insertion hole 13, and the space below the lower surface of the receiving member 16 in the second intermediate hole 13c is the valve chamber 14.

  A body portion 17b of the valve seat member 17 is fitted into the lower small diameter hole 13d of the internal insertion hole 13, and an O-ring 46 is interposed between the lower small diameter hole 13d and the body portion 17b of the valve seat member 17. It is intervened.

  An inlet 11 connected to the valve chamber 14 is opened on the side surface (front surface) of the valve body 10 (see FIG. 2), and an outlet 12 connected to the lower small-diameter hole 13d is opened on the bottom surface. ing.

  Between the rotor 30 and the valve shaft 25, there is provided a screw feed mechanism 18 for making the valve body 24 contact and separate from the valve seat 23 by utilizing the rotation of the rotor 30. The screw feed mechanism 18 is formed on a fixed screw portion (male screw portion) 28 formed on the outer periphery of a cylindrical guide bush 26 and on an inner periphery of a cylindrical valve shaft holder 32 having a lower opening, and the fixed screw portion. And a moving screw portion (female screw portion) 38 screwed to 28.

  The cylindrical guide bush 26 has a lower end portion 26a press-fitted and fixed to the receiving member 16, and a valve shaft 25 (a lower large-diameter portion 25a thereof) is slidably inserted into the inner periphery thereof.

  The valve shaft holder 32 is disposed on the outer periphery of the valve shaft 25 and the guide bush 26. The valve shaft holder 32 and the rotor 30 are coupled via a support ring 36, and the valve shaft holder 32 is connected to the support ring 36. Thus, the rotor 30, the support ring 36 and the valve shaft holder 32 are integrally connected.

  A lower stopper body (fixed stopper) 27 constituting one of the stopper mechanisms is fixed to the guide bush 26, and an upper stopper body (moving stopper) 37 constituting the other stopper mechanism is fixed to the valve shaft holder 32. ing.

  The upper small diameter portion 26b of the guide bush 26 is inserted into the upper portion of the valve shaft holder 32, and the upper small diameter portion 25b of the valve shaft 25 is inserted into the insertion hole formed in the center of the ceiling portion 32a of the valve shaft holder 32. It is inserted. A push nut 33 for ascending the valve shaft 25 with the rotation of the rotor 30 and the valve shaft holder 32 is fixed (press-fit) to the upper end portion of the upper small diameter portion 25b of the valve shaft 25.

  Further, the valve shaft 25 is extrapolated to the upper small diameter portion 25b of the valve shaft 25, and between the ceiling portion 32a of the valve shaft holder 32 and the upper terrace surface of the lower large diameter portion 25a of the valve shaft 25. It is always urged downward (in the valve closing direction) by a compression coil spring 34 for valve closing and buffering that has been mounted. The upper end of the compression coil spring 34 is locked to the lower surface of the ceiling portion 32a of the valve shaft holder 32 via a spring receiving member such as a washer. A return spring 35 made up of a coil spring is disposed on the ceiling portion 32 a of the valve shaft holder 32.

  In the motor-operated valve 1 having such a configuration, the stator coils 53 and 53 are energized and excited (pulse supply) in the first mode, so that the rotor against the guide bush 26 fixed to the receiving member 16 is obtained. 30 and the valve shaft holder 32 are rotated in one direction, and for example, the valve shaft holder 32 is moved downward by the screw feed of the screw feed mechanism 18 and the valve body 24 is seated on the valve seat 23.

  At this time, the upper stopper body 37 is not yet in contact with the lower stopper body 27, and the rotor 30 and the valve shaft holder 32 are further rotated and lowered while the valve body 24 is seated on the valve seat 23. At this time, since the valve shaft holder 32 is lowered with respect to the valve shaft 25, the downward force of the valve shaft holder 32 is absorbed by the compression coil spring 34 being compressed. Thereafter, when the rotor 30 further rotates and the valve shaft holder 32 is lowered, the upper stopper body 37 comes into contact with the lower stopper body 27 and the valve shaft holder 32 is lowered even if the pulse supply to the stator coils 53 and 53 is continued. It is forcibly stopped and is in a fully closed state (most lowered position).

  On the other hand, when the stator coils 53, 53 are energized and excited (pulse supply) in the second mode from this fully closed state, the rotor 30 and the valve shaft holder 32 are rotated in the opposite direction to the guide bush 26, and the screw The valve shaft holder 32 is now moved upward by the screw feed of the feed mechanism 18. In this case, since a small gap is formed between the upper surface of the ceiling portion 32a of the valve shaft holder 32 and the lower end of the push nut 33, the rotor 30 and the valve shaft holder 32 are rotated by a predetermined amount from the lowest position. Then, the upper surface of the ceiling portion 32a comes into contact with the lower end of the push nut 33 and pushes up the valve shaft 25. As a result, the valve body 24 moves away from the valve seat 23 to open the valve port, and the refrigerant opens the valve port. Pass through.

  Therefore, in the motor operated valve 1, the effective opening area of the valve seat (valve port) 23, that is, the flow rate of the refrigerant can be adjusted by the rotation amount of the rotor 30, and the rotation amount of the rotor 30 depends on the number of supply pulses. Since it is controlled, the refrigerant passage flow rate can be adjusted with high accuracy.

  In assembling the motor-operated valve 1 of the present embodiment having the above-described configuration, for example, first, the valve seat member 17 and the guide bush 26 are press-fitted and fixed to the receiving member 16, and the valve in the manner as described above. The shaft 25, the compression coil spring 34, the valve shaft holder 32, the rotor 30, the stopper bodies 27 and 37, etc. are assembled, and then the lower end portion of the can 40 is welded to the receiving member 16 to obtain the internal machine component 15. The lower stopper body 27 can be integrally formed with the guide bush 26 before the guide bush 26 is press-fitted into the receiving member 16.

  Next, the O-ring 46 is attached to the lower end portion of the internal machine component 15 (the trunk portion 17b of the valve seat member 17), and the O-ring 45 is attached to the first intermediate hole 13b of the valve body 10, and in this state, The inner machine part 15 is inserted into the inner insertion hole 13 so as to be dropped from above. Thereby, the hook-shaped portion 16 a of the receiving member 16 is placed on the O-ring 45.

  Subsequently, the stator 50 is externally fitted so as to be dropped onto the internal machine component 15 (can 40) from above. As a result, the ceiling portion 56 a of the mold cover 56 of the stator 50 is placed on the ceiling portion 40 a of the can 40. At this time, the internal machine part 15 and the stator 50 are only on the O-ring 45, and the O-ring 45 is not sufficiently compressed.

  Next, the four bolts 60 are respectively screwed into the female screw portions 62 formed in the vicinity of the upper four corners of the valve body 10 through the through holes 61 formed in the extended bottom portion 56c of the mold cover 56, and the extended bottom portion 56a. Is fastened and fixed to the upper surface 10 a of the valve body 10. As a result, the internal machine component 15 (the ceiling (top) 40a of the can 40) is pressed downward by the stator 50 (the ceiling 56a of the mold cover 56), and the bowl-shaped portion 16a of the receiving member 16 is large. The O-ring 45 is compressed in the vertical direction by the flange-shaped portion 16a of the receiving member 16 while being placed and pressed on the lower horizontal portion of the diameter hole 13a, and the internal machine component 15 is pressed and clamped between the stator 50 and the valve body 10. At the same time, the stator 50 is assembled to the valve body 10.

  In this case, the O-ring 45 tends to swell in the width (thickness) direction by being compressed in the vertical direction, so that its outer surface is the outer peripheral surface of the trunk portion 16b of the receiving member 16 and the flange-shaped portion 16a. The lower surface and the inner peripheral surface and the bottom surface (terrace surface) of the first intermediate hole 13b are strongly pressed against each other. Thereby, the space | interval between the internal machine component 15 and the valve main body 10 is sealed reliably.

  As described above, in the motor-operated valve 1 according to the present embodiment, when the stator 50 is fastened and fixed to the valve body 10 with the bolt 60, the internal machine component 15 is pressed and clamped between the stator 50 and the valve body 10. At that time, the O-ring 45 interposed between the internal machine component 15 (receiving member 16) and the valve body 10 is compressed to seal between them, so that the required airtightness is ensured. In addition, the O-ring 46 interposed between the valve seat member 17 and the lower small-diameter hole 13d of the valve body 10 ensures airtightness between the respective members.

  On the other hand, if the bolt 60 is loosened, the stator 50 is separated from the valve body 10, and at the same time, the internal component 15 is released from the pressing and clamping state and can be extracted from the valve body 10.

  Therefore, in the motor-operated valve 1 of the present embodiment, it is possible to replace the internal machine component 15 while ensuring the required airtightness.

  1 to 3, the ceiling portion 56a of the stator 50 (the surface facing the can 40) is substantially flat, but the ceiling portion 40a of the can 40 is gentle as shown in FIG. In the case where a curved surface is provided, it is a matter of course that the curved surface may be similar to or similar to the curved surface. 4 is a plan view showing a second embodiment of the motor-operated valve according to the present invention, FIG. 5 is a front view of the motor-operated valve according to the second embodiment, and FIG. 6 is an enlarged cross-sectional view taken along line YY in FIG. It is.

  The motor-operated valve 2 of the second embodiment shown in FIGS. 4 to 6 has the same basic configuration and operation as the motor-operated valve 1 of the first embodiment shown in FIGS. About the motor operated valve 2, the same code | symbol is attached | subjected to the part corresponding to each part of the motor operated valve 1 of 1st Example, those duplication description is abbreviate | omitted, and the motor valve 1 of 1st Example is hereafter demonstrated. The difference will be explained mainly.

  Also in the motor-operated valve 2 of the second embodiment, the four screw bolts 60 are internally threaded portions 62 formed in the vicinity of the upper four corners of the valve body 10 through the through holes 61 formed in the extended bottom portion 56c of the mold cover 56, respectively. The internal machine component 15 is pressed and clamped between the stator 50 and the valve body 10 by screwing in and fixing the stator 50 to the valve body 10 in the same manner.

  In the motor-operated valve 2 of the present embodiment, the lower end portion of the can 40 is not welded to the receiving member 16, and a bowl-shaped bottom portion 40 b is provided at the lower end portion of the can 40. Further, the mold cover 56 of the stator 50 is not provided with a ceiling portion 56a for pressing the ceiling portion 40a of the can 40, and the bowl-shaped bottom portion 40b of the can 40 is provided at the center of the bottom surface portion of the mold cover 56. An annular convex portion 56d having a rectangular cross section to be pressed protrudes downward.

  Further, since the lower end portion of the can 40 is not welded to the receiving member 16, the receiving member 16 and the valve seat member 17 which are made of and integrated with different materials in the first embodiment are made of the same material (good cutting properties). 1) to form a receiving member 16 ′ with a valve seat portion 17 ′. Near the outer peripheral edge of the flange-shaped portion 16a of the receiving member 16 ', an annular convex portion 16c projects upward, and the outer peripheral edge 16d of the flange-shaped portion 16a protrudes from the flange-shaped bottom portion 40b of the can 40. The lower end corner portion including a part of the ring-shaped convex portion 16c is placed in contact with the outer circumferential surface of the annular convex portion 16c, and the flange-shaped portion 16a of the receiving member 16 ′ is formed on the annular convex portion of the mold cover 56 of the stator 50. 56d is pressed downward through the bowl-shaped bottom 40b of the can 40.

  Further, the insertion hole 13 ′ provided in the valve body 10 is, in order from the top, the upper large-diameter hole 13 a having a larger diameter than that of the first embodiment, into which the bowl-shaped bottom portion 40 b of the can 40 is fitted, A first intermediate hole 13b into which the flange 16a of the receiving member 16 'is fitted and locked, a second intermediate hole 13c having a smaller diameter than the first intermediate hole 13b, and a lower small diameter hole having a smaller diameter than the second intermediate hole 13c. The second intermediate hole 13c and the lower small-diameter hole 13d have the same diameter as that of the first embodiment.

  An O-ring 47 is interposed between the bottom surface of the upper large-diameter hole 13a in the insertion hole 13 'and the bowl-shaped bottom 40b of the can 40 so as to be compressed in the vertical direction by the bowl-shaped bottom 40b. . The outer surface of the O-ring 47 is strongly pressed against a total of four surfaces: the flange-shaped bottom portion 40b of the can 40, the inner peripheral surface and the bottom surface of the upper large-diameter hole 13a, and the outer peripheral surface of the flange-shaped portion 16a of the receiving member 16 '. Thus, the space between the internal machine component 15 and the valve body 10 is sealed.

  A body portion 16b below the flange-shaped portion 16a of the receiving member 16 'is fitted into the second intermediate hole 13c in the insertion hole 13', and the lower small-diameter hole 13d is manufactured integrally with the receiving member 16 '. The body portion 17b of the valve seat portion 17 'is inserted.

  In assembling the motor-operated valve 2 of the present embodiment having the above-described configuration, for example, first, the guide bush 26 is press-fitted and fixed to the receiving member 16 ′ with the valve seat portion 17 ′, and in this manner, as described above. Then, the valve shaft 25, the compression coil spring 34, the valve shaft holder 32, the rotor 30, the stopper bodies 27, 37 and the like are assembled to obtain the internal machine component 15 ′ excluding the can 40.

  Next, with the O-ring 46 attached to the lower end portion of the internal machine component 15 ′ excluding the can 40 (the trunk portion 17b of the valve seat portion 17 ′), the internal machine component 15 ′ is inserted into the insertion hole 13 from above. Insert to drop. As a result, the hook-shaped portion 16a of the receiving member 16 'is inserted into the first intermediate hole 13b and locked to the bottom surface (step surface).

  Subsequently, the O-ring 47 is mounted in an annular space formed between the inner peripheral surface and the bottom surface of the upper large-diameter hole 13a in the inner insertion hole 13 ′ and the outer peripheral surface of the flange-shaped portion 16a of the receiving member 16 ′. .

  Thereafter, the can 40 is inserted into the upper large-diameter hole 13a of the insertion hole 13 'so as to be dropped from the upper part 15'. As a result, the bowl-shaped bottom portion 40 b of the can 40 is placed on the O-ring 47.

  Subsequently, the stator 50 is externally fitted so as to be dropped onto the internal machine component 15 (can 40) from above. As a result, the annular convex portion 56 d of the mold cover 56 of the stator 50 is placed on the bowl-shaped bottom portion 40 b of the can 40. At this time, the can 40 and the stator 50 are only on the O ring 47, and the O ring 45 is not sufficiently compressed.

  Next, the four bolts 60 are respectively screwed into the female screw portions 62 formed in the vicinity of the upper four corners of the valve body 10 through the through holes 61 formed in the extended bottom portion 56c of the mold cover 56, and the extended bottom portion 56a. Is fastened and fixed to the upper surface 10 a of the valve body 10. Thereby, the flange-shaped bottom portion 40b of the can 40 is pressed downward by the annular convex portion 56d of the mold cover 56 of the stator 50, the O-ring 47 is compressed in the vertical direction, and the flange-shaped portion of the receiving member 16 '. 16 a is pressed against the bottom surface (step surface) of the first intermediate hole 13 b by the annular convex portion 56 d via the bowl-shaped bottom portion 40 b of the can 40, and the internal machine component 15 is pressed and clamped between the stator 50 and the valve body 10. At the same time, the stator 50 is assembled to the valve body 10.

  In this case, since the O-ring 47 is compressed in the vertical direction, it tends to swell in the width (thickness) direction, so that the outer surface thereof is the inner periphery of the bowl-shaped bottom portion 40b of the can 40 and the upper large-diameter hole 13a. The surface and the bottom, and the outer peripheral surface of the flange-shaped portion 16a of the receiving member 16 'are pressed into a total of four surfaces. Thereby, the space | interval between the internal machine component 15 and the valve main body 10 is sealed reliably.

  Thus, also in the motor-operated valve 2 of the present embodiment, when the stator 50 is fastened and fixed to the valve main body 10 with the bolt 60 as in the first embodiment, the internal machine component 15 including the can 40 is replaced with the stator 50, the valve main body 10 and And the O-ring 47 interposed between the internal machine parts 15 (the bowl-shaped bottom part 40b of the can 40 and the bowl-like part 16a of the receiving member 16 ') and the valve body 10 is compressed and compressed. Therefore, the required airtightness can be ensured. Similarly to the first embodiment, the O-ring 46 interposed between the valve seat portion 17 ′ and the lower small-diameter hole 13 d of the valve main body 10 ensures airtightness between them.

  On the other hand, if the bolt 60 is loosened, the stator 50 is separated from the valve body 10, and at the same time, the internal component 15 is released from the pressing and clamping state and can be extracted from the valve body 10.

  Therefore, in the motor-operated valve 2 of the present embodiment, it is possible to replace the internal machine component 15 while ensuring the required airtightness. In addition, in the motor-operated valve 2 of the present embodiment, the can 40 is provided with the receiving member 16. Since it is not welded to the can 40, the can 40 and the internal machine parts 15 excluding the can 40 can be extracted separately (sequentially), thereby facilitating maintenance and inspection and constituting the internal machine parts 15 It is also possible to replace only a part of the parts.

  In the motor-operated valve 2 of the second embodiment, the can 40 with the bowl-shaped bottom portion 40b may be integrated with the stator 50 as an insert when the stator 50 is molded (when the mold cover 56 is manufactured). Good.

  Further, the lower end portion of the can 40 may be welded to the receiving member 16 'as in the first embodiment.

  In the description of the first and second embodiments, a bolt 60 is inserted into a through hole 61 provided in the stator 50 and screwed into a female screw portion 62 formed in the valve body 10. Although the stator 50 is fixed to the valve body 10, the present invention is not limited to this, and a stud bolt is previously planted in the valve body 10, and the stud bolt is inserted into the through hole of the stator 50. The stator 50 may be fixed to the valve main body 10 by inserting it through 61 and then screwing a nut into the stud bolt.

  Alternatively, the portion of the valve main body 10 provided with the female screw portion 62 is configured to project from the valve main body 10, and the female screw portion 62 is formed as a hole through which a bolt can be inserted. The stator 50 may be fixed to the valve body 10 by screwing a nut through the bolt.

  Furthermore, although reference numeral 11 is a fluid inlet and reference numeral 12 is a fluid outlet, it is natural that reference numeral 12 may be an inlet and reference numeral 11 may be an outlet.

  Furthermore, an O-ring (O-rings 45 and 46 in the first embodiment and O-rings 47 and 46 in the second embodiment) is arranged between the internal machine component and the valve body. As long as the sealing member has elasticity, a sealing material other than the O-ring may be disposed.

  Furthermore, in the first embodiment, the can 40 has been described as being welded to the receiving member 16, but the present invention is not limited to this. For example, the can 40 is related to the second embodiment. As described above, a hook-shaped bottom portion may be formed at the lower end of the can, and the receiving member 16 may be pressed by the hook-shaped bottom portion, so that fixing (welding) between the can and the receiving member may be omitted. Is natural.

  Furthermore, in the first embodiment, the valve seat member 17 provided with the valve seat 23 is fixed to the receiving member 16, and in the second embodiment, the valve seat 23 is provided integrally with the receiving member 16 '. However, the present invention is not limited to this, and the valve seat may be provided on the valve body 10 side. That is, the valve seat may be formed directly on the valve body 10, or may be formed separately from the valve body 10, and this separate component may be caulked to the valve body 10 and fixed by welding or the like.

DESCRIPTION OF SYMBOLS 1 Motorized valve 2 of 1st Example 10 Motorized valve 10 of 2nd Example Valve main body 11 Inlet 12 Outlet 13, 13 'Insertion hole 14 Valve chamber 15 Internal machine parts 16, 16' Receiving member 17 Valve seat member 17 '' Valve seat 18 Screw feed mechanism (drive mechanism)
24 Valve body 25 Valve shaft 28 Fixing screw part (Male thread part)
26 Guide bush 30 Rotor 32 Valve shaft holder 33 Push nut 34 Compression coil spring 36 Support ring 38 Moving screw part (female screw part)
40 can 40a ceiling portion 40b bowl-shaped bottom portion 50 stator 53 coil 56 mold cover 56a ceiling portion 56b cylindrical trunk portion 56c extended bottom portion 56d annular convex portion 60 bolt 61 through hole 62 female screw portion

Claims (10)

A receiving member, a can that defines a predetermined space with the receiving member, a valve shaft that is disposed in the space, a rotor that rotates the valve shaft, and the rotation of the rotor that causes the valve shaft to move forward and backward Internal machine parts with a drive mechanism to convert
A stator externally fitted to the can;
An insertion hole that accommodates the receiving member, and a valve body that includes an inlet and an outlet that communicate with the insertion hole;
The motor-operated valve characterized in that the stator is screwed to the valve body in order to press and fix the internal machine component to the valve body.   The motor-operated valve according to claim 1, wherein the valve seat is provided on the receiving member.   The motor-operated valve according to claim 1, wherein the valve seat is provided in the valve body.   The electric valve according to any one of claims 1 to 3, wherein the stator presses the top of the can toward the valve body by the screwing.   The motor-operated valve according to claim 4, wherein the can is fixed to the receiving member.   The motor-operated valve according to claim 5, wherein the can is welded to the receiving member. The stator presses the top of the can toward the valve body by the screwing,
The motor-operated valve according to claim 2, wherein the receiving member includes a part welded to the can and a part formed with the valve seat as separate parts. The can is provided with a bowl-shaped bottom portion that contacts the receiving member at the lower end thereof,
The stator includes a convex portion that is in contact with the bowl-shaped bottom portion at a lower portion thereof,
The motor-operated valve according to any one of claims 1 to 3, wherein the convex portion presses the bowl-shaped bottom portion by the screwing of the stator.   The motor-operated valve according to claim 8, wherein the can is integrated with the can as an insert at the time of molding.   The motor-operated valve according to any one of claims 1 to 9, wherein a sealing material is disposed between the internal machine component and the valve main body.

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