JP2008291985A - Rotor central body for motor operated valve, rotor feed screw, and rotor manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce manufacturing cost of a motor operated valve by improving manufacturing processes of a rotor central body, a rotor feed screw and a rotor for the motor operated valve. <P>SOLUTION: By using openable and closable molding equipment 23 for defining a molding cavity 28 of a sleeve 14, a molding recessed part 24a of a valve closure regulation stopper 14a and a first positioning part 27a positionally corresponding to the molding recessed part 24a are provided for the molding equipment 23. A second positioning part 11c is provided for a bush 11 so that a thread cutting start end part 11b of a female screw 11a and the molding recessed part 24a of the valve closure regulation stopper 14a positionally correspond when matching with the first positioning part 27a. The rotor central body 19 is manufactured by injecting a melted resin into the cavity 28 after mounting the bush 11 to the molding equipment 23 so that the second positioning part 11c matches with the first positioning part 27a and closing a mold of the moulding equipment 23. The rotor feed screw 20 and the rotor 40 are manufactured in substantially same procedures. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention is used for flow control of a fluid such as a refrigerant in a refrigeration cycle system, and a rotor central body disposed at a central portion of a rotor of an electric valve provided with a valve body that moves linearly when the rotor rotates, The present invention relates to a rotor feed screw that is screwed with a rotor to move the rotor, and a method for manufacturing the rotor.

  Conventionally, as the electric valve, for example, Patent Document 1 includes a first flow path 52 and a second flow path 53 communicating with a valve chamber 51 as shown in FIG. A valve main body 55 provided with a valve seat 54 in the chamber communication portion, a rod-shaped needle valve 57 that contacts and separates from a seat valve seat 56 of the valve main body 55, a cylindrical sealing case 59, and an outer side of the sealing case 59. The stator coil 67 and the inner casing 59 are rotated by energization and excitation of the stator coil 67 to move in the valve opening / closing direction, and are a cylindrical sleeve 62 and a cylinder fixed to the outer side of the sleeve 62 by a stop ring 66. And a male screw pipe 61 that opens and closes the needle valve 57 by a screw feeding action by rotation of the rotor 64, and a lower cover 60 of the sealed case 59 is welded and fixed to the valve body 55. Motorized valve 50 It is draft.

  As shown in FIGS. 6 and 7B, the motor-operated valve 50 has a valve closing restricting stopper 62a protruding from the lower end portion of the sleeve 62, and as shown in FIGS. A fully-closed stopper 58a protrudes from the body 58. When the needle valve 57 is closed, the valve-closing regulating stopper 62a contacts the fully-closed stopper 58a as shown in FIG. Further lowering is regulated.

  When the lowering of the rotor 64 is regulated, the dimension h4 from the lower end of the bush 68 shown in FIG. 7B to the lower end of the valve closing regulating stopper 62a is an integral multiple of the pitch of the female screw 68a. The dimension h5 from the upper end of the male screw pipe 61 shown in FIG. 8B to the upper end of the fully closed stopper 58a is set to be an integral multiple of the pitch of the male screw 61a + pitch / 2. The amount of contact with the closing stopper 58a is adjusted to the screw pitch / 2.

Japanese Patent No. 3310042

  Conventionally, when manufacturing a rotor center body 69 (combination of a sleeve 62 and a bush 68 as shown in FIG. 6) disposed at the center of the rotor 64 of the motor-operated valve 50, as shown in FIG. As described above, the mold device 71 that can be opened and closed is used to define the molding cavity 73 of the sleeve 62. The lower mold 72 of the mold device 71 is provided with a molding recess 72 a of the valve closing restriction stopper 62 a and a pin mounting hole 72 c having a key protrusion 72 b on the inner periphery that opens at the center of the molding cavity 73. The set pin 74, in which the bush 68 is screwed and fixed to the pin mounting hole 72c of the lower die 72, is in the state shown in FIG. 7C after the sleeve 62 is formed (the threaded start end 68b of the female screw 68a of the bush 68). Is positioned by engagement between the key protrusion 72b and the key groove 74a (provided on the outer periphery of the lower end of the set pin 74), and the bush 68 A predetermined dimension h4 that is an integral multiple of the pitch of the female screw 68a of the bush 68 between the pin step portion 74b with which the bottom surface 68c of the bush contacts and the inner bottom surface of the stopper molding recess 72a. After holding, to mold closing a mold apparatus 71. Then, a molten resin is injected and injected into the molding cavity 73 to manufacture a rotor center body 69 as shown in FIGS. 7B and 7C in which the bush 68 and the sleeve 62 are integrated.

  Similarly, as shown in FIG. 8, the die feed device 80 that defines the molding cavity 82 of the flange body 58 is used for the rotor feed screw 70. The lower die 81 of the mold device 80 is provided with a molding concave portion 81a of the valve full-close stopper 58a and a bush mounting hole 81c having a key protrusion 81b on the inner bottom surface opened at the center of the molding cavity 82. The bottomed cylindrical set bush 83 in which the male screw pipe 61 is screwed and fixed to the bush mounting hole 81c of the lower die 81 is positioned so that the threading start end 61b of the male screw 61a corresponds to the stopper molding recess 81a. Positioning is performed by engaging the key protrusion 81b and the key groove 83a (provided at the lower end portion of the set bush 83), and the base end mounting portion 61c of the male screw tube 61 protrudes above the lower die 81. Attach as shown in FIG. Then, the mold device 80 is closed, molten resin is injected and injected into the molding cavity 82, and the male screw pipe 61 and the flange body 58 are integrated into a rotor feed as shown in FIGS. 8B and 8C. The screw 70 was manufactured.

  As described above, conventionally, in manufacturing the rotor center body 69 and the rotor feed screw 70, the set pin 74 and the set bush 83 are prepared, and these are integrated with the bush 68 and the male screw pipe 61, and then the mold apparatus. Since it is necessary to perform resin molding using 71 and the mold apparatus 80, it takes time to manufacture the rotor central body 69 and the rotor feed screw 70, which leads to an increase in the manufacturing cost of the electric valve 50.

  Therefore, the present invention has been made in view of the problems in the conventional technology described above, and improves the manufacturing process of the rotor body for the motorized valve, the rotor feed screw and the rotor, and reduces the manufacturing cost of the motorized valve. An object of the present invention is to provide an electric valve rotor central body, a rotor feed screw, and a rotor manufacturing method that can be used.

  In order to achieve the above object, the present invention provides a rotor central body disposed at the center of the rotor of an electric valve having a valve body that moves linearly as the rotor of the electric motor rotates. The sleeve further includes a valve closing restriction stopper for restricting movement of the rotor in the valve closing direction when closed, a cylindrical sleeve formed entirely of a synthetic resin, a female screw on the inner periphery, and the sleeve A rotor body for a motor-operated valve comprising a bush integrally fixed to the inner peripheral portion of the sleeve, wherein a mold device that can be opened and closed that defines a molding cavity of the sleeve is used. , A molding recess of the valve-closing regulating stopper, and a first positioning portion corresponding to the molding recess, and when the bush is aligned with the first positioning portion, a threading start end portion of the female screw And the valve closing restriction strike A second positioning portion is provided so that the molding concave portion of the pad corresponds to the position, and the bush is attached to the mold apparatus so that the second positioning portion coincides with the first positioning portion, After the mold apparatus is closed, molten resin is injected and injected into the cavity to manufacture a rotor central body, and the rotor central body for an electric valve is manufactured.

  According to the present invention, the bushing is formed simultaneously with the threading start end portion of the female screw and the second positioning portion corresponding to the position of the threading start end portion, and the bushing is the first positioning position of the mold apparatus. Since the mold body is closed and the molten resin is injected and injected after mounting the mold body so that the portion and the second positioning portion coincide with each other, the rotor central body can be manufactured. Thus, it is not necessary to use a set pin, and the rotor central body can be easily manufactured by resin molding using only a bush and a mold device.

  In the manufacturing method of the rotor central body for the electric valve, the first positioning portion is a protrusion or a step portion, and the second positioning portion is a key groove that engages with the protrusion, or the step portion. And a cutout portion that is cut out in a D shape when viewed from the axial direction of the rotor central body. Thereby, a 1st positioning part and a 2nd positioning part can be formed easily.

  The present invention also relates to a rotor feed screw that is screwed with the rotor of the electric valve provided with a valve body that moves linearly as the rotor of the electric motor rotates, and has an external thread on the outer periphery, A male threaded pipe having a mounting portion for the valve body and a valve fully closed stopper for restricting the rotor from moving in the valve closing direction when fully closed, and is integrally fixed to the outer periphery of the male threaded pipe. A motor-driven rotor lead screw for a motor-operated valve comprising a synthetic resin flange body, wherein an openable / closable mold apparatus for defining a molding cavity of the flange body is used, and the valve apparatus When a molding concave portion of the closed stopper and a first positioning portion corresponding to the molding concave portion are provided, and when the male screw pipe is matched with the first positioning portion, the threading start end portion of the male screw and the valve Molded recess of fully closed stopper Is provided with a second positioning part so that the male screw tube is attached to the mold apparatus so that the second positioning part coincides with the first positioning part. After the mold is closed, a molten resin is injected and injected into the cavity to produce a rotor feed screw.

  According to the present invention, the male threaded tube is formed simultaneously with a threading start end portion of the male thread and a second positioning portion corresponding to the position of the threading start end portion. Since the positioning unit and the second positioning unit are attached to the mold device so that the second positioning unit matches, the mold device can be closed and the molten resin can be injected and injected to produce a rotor feed screw. There is no need to use a set bush as in the prior art, and a rotor feed screw can be easily manufactured by resin molding using only a male screw pipe and a mold device.

  In the manufacturing method of the rotor feed screw for the electric valve, the first positioning portion is a protrusion or a step portion, and the second positioning portion is a key groove that engages with the protrusion, or the step portion. It can be a notch portion that is notched in a D shape when viewed from the axial direction of the rotor feed screw. Thereby, a 1st positioning part and a 2nd positioning part can be formed easily.

  Furthermore, the present invention provides an electric valve having a valve body that moves linearly as the rotor of the electric motor rotates, and further restricts the rotor from moving in the valve closing direction when fully closed. A cylindrical rotor body having a valve-closing restriction stopper for molding, and a whole formed of a synthetic resin; a bush having an internal thread on the inner periphery and integrally fixed to the inner periphery of the rotor body; A motor-driven valve rotor manufacturing method comprising: a mold device that can be opened and closed that defines a molding cavity of the rotor body; and a molding recess of the valve-closing regulating stopper, and the molding recess When the bushing is aligned with the first positioning portion, the threading start end portion of the female screw and the molding recessed portion of the valve closing restriction stopper correspond to each other when the bushing is aligned with the first positioning portion. As the second position A fitting portion is provided, and the bush is attached to the mold apparatus so that the second positioning section coincides with the first positioning section. After the mold apparatus is closed, the molten resin is inserted into the cavity. The rotor is manufactured by injection injection of the above.

  According to the present invention, the bushing is formed simultaneously with the threading start end portion of the female screw and the second positioning portion corresponding to the position of the threading start end portion, and the bushing is the first positioning position of the mold apparatus. Since the rotor can be manufactured by mounting the mold apparatus so that the part and the second positioning part coincide with each other, then closing the mold apparatus and injecting and injecting a molten resin containing magnet powder, Thus, there is no need to use a set pin or the like, and the rotor can be easily manufactured by resin molding using only a bush and a mold device.

  In the method for manufacturing a rotor for an electric valve, the first positioning portion is a protruding portion or a stepped portion, and the second positioning portion is in contact with a key groove or the stepped portion that engages with the protruding portion. , And a cutout portion cut into a D shape when viewed from the axial direction of the rotor. Thereby, a 1st positioning part and a 2nd positioning part can be formed easily.

  As described above, according to the present invention, the manufacturing process of the motor valve rotor central body, the rotor feed screw, and the rotor can be simplified, and the manufacturing cost of the motor operated valve can be reduced.

  FIG. 1 shows an example of a motor-operated valve incorporating a rotor central body and a rotor feed screw manufactured by the method according to the present invention. The motor-operated valve 1 has a structure substantially similar to that of the conventional motor-operated valve 50 described above. A valve body 6 having a first flow path 3 and a second flow path 4 communicating with the valve chamber 2, and a valve seat 5 provided in a valve chamber communication portion of the second flow path 4, and a seat valve of the valve main body 6 A rod-shaped needle valve 8 that contacts and separates from the seat 7, a cylindrical sealed case 9, a stator coil (not shown) arranged outside the sealed case 9, and the stator case 9 is rotated by energization excitation of the stator coil inside the sealed case 9. And a male screw pipe 16 for opening and closing the needle valve 8 by a screw feed action by the rotation of the rotor 15, and a lower lid 17 of the sealing case 9 is fixed to the valve body 6 by welding. ing. The rotor 15 includes a cylindrical bush 11, a cylindrical permanent magnet 13 fixed to the outside of the bush 11 with a retaining ring 12, and a cylindrical sleeve 14 interposed between the bush 11 and the permanent magnet 13. And have.

  As shown in FIGS. 1 and 2 (c), the motor-operated valve 1 is provided with a valve closing restricting stopper 14a projecting from the lower end portion of the sleeve 14, and as shown in FIGS. 1 and 3 (c), a male screw A fully closed stopper 21a protrudes from the flange body 21 integrated with the pipe 16, and when the needle valve 8 is closed, the valve closing restricting stopper 14a comes into contact with the fully closed stopper 21a as shown in FIG. The rotor 15 is further prevented from lowering when the valve is closed.

  When the lowering of the rotor 15 is restricted, for example, the dimension h1 from the bottom surface 11d of the bush 11 to the lower end of the valve closing restriction stopper 14a shown in FIG. 2C is an integral multiple of the pitch of the female screw 11a. In addition, the dimension h2 from the upper end of the male screw pipe 16 to the upper end of the fully closed stopper 21a shown in FIG. 3B is set to be an integral multiple of the pitch of the male screw 16a + pitch / 2, and valve closing restriction is set. The amount of contact between the stopper 14a and the fully closed stopper 21a is adjusted to a screw pitch / 2.

  Next, a method for manufacturing the rotor central body 19 of the motor-operated valve 1 will be described with reference to FIGS.

  FIG. 2A shows a mold apparatus 23 for manufacturing the rotor center body 19, and FIGS. 2B to 2D show the rotor center body 19 manufactured using the mold apparatus 23. The mold apparatus 23 includes an upper mold 24 and a lower mold 27 having a mounting portion 27b for mounting the bush 11, and includes a molding cavity 28 of the sleeve 14 shown in FIG. A stopper molding recess 24a of the regulation stopper 14a is formed. In addition, a key protrusion 27 a that engages with the key groove 11 c of the bush 11 is provided on the lower mold 27. Furthermore, the position of the ceiling surface of the stopper molding recess 24a is set so that the distance from the upper surface 11f of the bush 11 is h1.

  Next, a method for processing the bush 11 and a method for setting the positions of the key protrusions 27a formed on the lower mold 27 and the stopper molding recesses 24a formed on the upper mold 24 will be described.

  As shown in FIGS. 2C and 2D, when the rotor center body 19 is completed, the threading start end portion 11b of the female thread 11a of the bush 11 and the center of the valve closing restriction stopper 14a are on the same straight line O. In this state, it is necessary to configure such that the dimension between the bottom surface 11d of the bush 11 and the lower end of the valve closing restriction stopper 14a of the sleeve 14 is h1.

  Therefore, the bush 11 is processed with a key groove 11c that engages with the key protrusion 27a formed on the lower mold 27 of the mold device 23, and at the same time, the threading of the female screw 11a is performed so as to correspond to the position of the key groove 11c. The starting end portion 11b is threaded. Here, as shown in FIGS. 2B to 2D, threading is performed so that the center line of the key groove 11c and the threading start end portion 11b are positioned on the same straight line O.

  On the other hand, in the upper mold 24, the position of the stopper molding recess 24a is set so that the rotor center body 19 is in the state shown in FIGS. That is, as described above, when the bushing 11 is threaded so that the center line of the keyway 11c and the threading start end portion 11b are located on the same straight line O, as shown in FIG. When the mold 23 is viewed from above, the center line of the key protrusion 24a of the upper mold 24 and the center of the stopper molding recess 24a overlap each other.

  Using the bush 11 processed as described above and the mold device 23, the bush 11 is placed on the lower die 27 so that the key groove 11c of the bush 11 is engaged with the key protrusion 27a of the lower die 27. 2B to FIG. 2D, which are placed on the part 27b, the mold device 23 is closed, the molten resin is injected and injected into the molding cavity 28, and the bush 11 and the sleeve 14 are integrated. Such a rotor center body 19 can be manufactured.

  Next, a method for manufacturing the rotor feed screw 20 of the motor-operated valve 1 will be described with reference to FIGS.

  FIG. 3A shows a mold apparatus 30 for manufacturing the rotor feed screw 20, and FIGS. 3B to 3D show the rotor feed screw 20 manufactured using the mold apparatus 30. The mold apparatus 30 includes an upper mold 31 and a lower mold 32 having a mounting portion 32b for mounting the male screw pipe 16, and a molding cavity 34 of the flange body 21 shown in FIG. A stopper molding recess 31a of the fully closed stopper 21a is formed. In addition, a key protrusion 32 a that engages with the key groove 16 c of the male screw pipe 16 is provided on the lower mold 32. Further, the position of the ceiling surface of the stopper molding recess 31a is set so that the distance from the uppermost portion of the male screw tube 16 becomes h2 when the male screw tube 16 is placed on the placement portion 32b of the lower mold 32.

  Next, a method for processing the male screw tube 16, a method for setting the positions of the key protrusions 32a formed on the lower die 32 and the stopper molding recesses 31a formed on the upper die 31 will be described.

  As shown in FIGS. 3B and 3C, when the rotor feed screw 20 is completed, the threading start end portion 16b of the male screw 16a of the male screw tube 16 and the center of the fully closed stopper 21a are on the same straight line O. In this state, it is necessary to configure so that the dimension between the upper end of the male screw tube 16 and the upper end of the fully closed stopper 21a of the flange body 21 is h2.

  Therefore, the male screw pipe 16 is processed with a key groove 16c that engages with the key protrusion 32a formed on the lower mold 32 of the mold apparatus 30, and at the same time, the male screw 16a is positioned so as to correspond to the key groove 16c. The threading start end 16b is threaded. Here, as shown in FIGS. 3B to 3D, the threading process is performed so that the center line of the key groove 16c and the threading start end portion 16b are positioned on the same straight line O.

  On the other hand, in the mold apparatus 30, the positions of the key protrusions 32a and the stopper molding recesses 31a are set so that the rotor feed screw 20 is in the state shown in FIGS. 3 (b) to 3 (d) after the flange body 21 is formed. Set. That is, as described above, when the male threaded tube 16 is threaded so that the center line of the key groove 16c and the threading start end 16b are located on the same straight line O, as shown in FIG. When the mold apparatus 30 is viewed from above, the center line of the key protrusion 32a of the lower mold 32 and the center of the stopper molding recess 31a overlap each other.

  Using the male threaded pipe 16 processed as described above and the mold apparatus 30, the male threaded pipe 16 is connected to the lower mold 32 so that the key groove 16c of the male threaded pipe 16 engages with the key protrusion 32a of the lower mold 32. 3B, the mold apparatus 30 is closed, the molten resin is injected and injected into the molding cavity 34, and the male screw tube 16 and the flange body 21 are integrated. The rotor feed screw 20 as shown in (d) can be manufactured.

  Next, as another embodiment according to the present invention, a method for manufacturing a rotor of an electric valve will be described with reference to FIG. The rotor 40 manufactured in the present embodiment has a valve closing restricting stopper 41a, and the cylindrical rotor main body 41, which is entirely formed of a resin material mixed with magnet powder, and the rotor central body 19 are manufactured. This is a combination of the bush 11 used at the time. Further, the overall shape of the rotor body 41 corresponds to a shape in which the permanent magnet 13 and the sleeve 14 shown in FIG. 1 are combined.

  4A shows a mold apparatus 43 for manufacturing a rotor according to the present invention, and FIGS. 4B to 4D show a rotor 40 manufactured using the mold apparatus 43. FIG. The mold apparatus 43 includes an upper mold 44 and a lower mold 47 having a mounting portion 47b for mounting the bush 11, and includes a molding cavity 48 of the rotor main body 41 shown in FIG. The stopper molding recess 44a of the valve closing restriction stopper 41a is formed. Further, a key protrusion 47 a that engages with the key groove 11 c of the bush 11 is provided on the lower mold 47. Furthermore, the position of the ceiling surface of the stopper molding recess 44a is set so that the dimension of the bush 11 up to the upper surface 11f is h3.

  Next, a method for processing the bush 11 and a method for setting the positions of the key protrusion 47a formed on the lower die 47 and the stopper molding recess 44a formed on the upper die 44 will be described.

  As shown in FIGS. 4C and 4D, when the rotor 40 is completed, the threading start end portion 11b of the female screw 11a of the bush 11 and the center of the valve closing restriction stopper 41a are located on the same straight line O. In addition, in this state, it is necessary to configure the dimension between the bottom surface 11d of the bush 11 and the lower end of the valve closing restriction stopper 41a of the rotor body 41 to be h3.

  Therefore, the bush 11 is processed with a key groove 11c that engages with the key protrusion 47a formed on the lower mold 47 of the mold device 43, and at the same time, the threading of the female screw 11a is performed so as to correspond to the position of the key groove 11c. The starting end portion 11b is threaded. Here, as shown in FIGS. 4B to 4D, the threading is performed so that the center line of the key groove 11c and the threading start end portion 11b are positioned on the same straight line O.

  On the other hand, in the mold apparatus 43, the positions of the key protrusion 47a and the stopper molding recess 44a are set so that the rotor 40 is in the state shown in FIGS. 4B to 4D after the rotor body 41 is molded. . That is, as described above, when the bushing 11 is threaded so that the center line of the key groove 11c and the threading start end portion 11b are located on the same straight line O, as shown in FIG. When the mold apparatus 43 is viewed from above, the center line of the key protrusion 47a of the lower mold 47 and the center of the stopper molding recess 44a overlap each other.

  Using the bush 11 processed as described above and the mold device 43, the bush 11 is placed on the mounting portion of the upper die 44 so that the key groove 11c of the bush 11 engages with the key protrusion 47a of the lower die 47. 4B, the mold device 43 is closed, the molten resin mixed with magnet powder is injected and injected into the molding cavity 48, and the bush 11 and the rotor body 41 are integrated. The rotor 40 as shown in (d) can be manufactured.

  In the above-described embodiment, when positioning the bush 11 or the like in the mold, a key groove 11c as shown in FIG. 5A is formed, and a key ridge protruding from the mold (see FIG. 2). No. 27a, etc.) is formed, but a D cut part (notch part cut out in a D shape when viewed from the axial direction of the bush 11 etc.) as shown in FIG. 5B is formed. Further, it can be brought into contact with a step portion formed on the corresponding mold, and can be formed in various other positions that can be positioned.

  Further, in the above embodiment, for example, in FIG. 2, the center line of the key groove 11c of the bush 11, the threading start end portion 11b, and the center of the valve closing restriction stopper 14a are positioned on the same straight line O. Although configured, these positional relationships are not limited to the same straight line O, and various positions can be used as long as they can be positioned in relation to the key protrusions 24a of the lower die 27 and the stopper molding concave portions 27b of the upper die 24. It can be a positional relationship.

It is a whole sectional view showing an example of a motor operated valve incorporating a rotor central body and a rotor feed screw manufactured by the method according to the present invention. The mold apparatus and bush used when implementing the manufacturing method of the rotor center body concerning this invention and the rotor center body manufactured by this invention are shown, (a) shows the state which positioned the bush to the mold apparatus. Overall sectional views (b) to (d) are a top view, an overall sectional view, and a bottom view, respectively, of a rotor central body after sleeve molding. 1 shows a mold apparatus and a male screw pipe used in carrying out a method of manufacturing a rotor feed screw according to the present invention, and a rotor feed screw manufactured according to the present invention, wherein (a) shows a state in which the male screw pipe is positioned in the mold apparatus. (B)-(d) are respectively a top view, an overall cross-sectional view, and a bottom view of a rotor feed screw after flange body molding. The mold apparatus and bush used when enforcing the manufacturing method of the rotor concerning the present invention, and the rotor manufactured by the present invention are shown, (a) is the whole sectional view showing the state where the bush was positioned in the mold apparatus, (B)-(d) is the top view, whole sectional view, and bottom view of a rotor after a rotor main body molding, respectively. It is a perspective view which shows the keyway and D cut part used for positioning to metal mold | dies, such as a bush, in the manufacturing methods, such as a rotor center body concerning this invention. It is a whole sectional view showing an example of the conventional electric valve. FIGS. 7A and 7B are views for explaining a rotor central body of the motor-operated valve in FIG. 6 and a method for manufacturing the rotor, in which FIG. 6A is a cross-sectional view illustrating the manufacturing method, and FIG. FIG. 4C is a bottom view of FIG. It is a figure for demonstrating the rotor feed screw and its manufacturing method of the electrically operated valve of FIG. 6, Comprising: (a) is sectional drawing for demonstrating a manufacturing method, (b) is a valve main body with the manufactured rotor feed screw. Sectional drawing which shows the state attached to (2), (c) is a top view of the rotor feed screw shown in (b).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Motorized valve 2 Valve chamber 3 1st flow path 4 2nd flow path 5 Valve seat 6 Valve main body 7 Seat valve seat 8 Needle valve 9 Sealing case 11 Bush 11a Female thread 11b Screw cutting start end 11c Key groove 11d Bottom 11e D cut part 11f Upper surface 12 Stop ring 13 Permanent magnet 14 Sleeve 14a Valve closing restricting stopper 15 Rotor 16 Male threaded pipe 16a Male thread 16b Screw cutting start end 16c Key groove 17 Lower lid 19 Rotor center body 20 Rotor feed screw 21 Flange body 21a Fully closed stopper 23 Mold device 24 Upper mold 24a Stopper molding recess 27 Lower mold 27a Key projection 27b Placement part 28 Molding cavity 30 Mold device 31 Upper mold 31a Stopper molding recess 32 Lower mold 32a Key projection 32b Placement part 34 Molding cavity 40 Rotor 41 Rotor Main body 41a Valve closing restriction stopper 43 Mold device 44 Upper mold 44a Stopper molding recess 47 Lower mold 47a Key projection 47b Placement part 48 Molding cavities h1 to h5 Predetermined height dimension

Claims (6)

A rotor central body arranged at the center of the rotor of an electric valve provided with a valve body that moves linearly as the rotor of the electric motor rotates, and the rotor further moves in the valve closing direction when fully closed It has a valve closing restriction stopper for restricting it, and has a cylindrical sleeve formed entirely of synthetic resin, and has an internal thread on the inner periphery, and is fixed integrally to the inner periphery of the sleeve A method of manufacturing a rotor body for an electric valve comprising a bush,
Using a mold device that can be opened and closed to define a molding cavity of the sleeve;
The mold apparatus is provided with a molding concave portion of the valve closing restriction stopper, and a first positioning portion corresponding to the molding concave portion,
When the bushing is matched with the first positioning portion, a second positioning portion is provided so that the threading start end portion of the female screw and the molding recessed portion of the valve closing restriction stopper correspond to each other in position.
The bush is attached to the mold apparatus such that the second positioning portion coincides with the first positioning portion,
A method for manufacturing a rotor central body for a motor-operated valve, wherein after the mold apparatus is closed, molten resin is injected and injected into the cavity to manufacture a rotor central body.   The first positioning portion is a protruding portion or a step portion, and the second positioning portion is a key groove that engages with the protruding portion, or abuts on the step portion, from the axial direction of the rotor central body. 2. The method of manufacturing a rotor body for a motor-operated valve according to claim 1, wherein the rotor core body is a notch cut into a D-shape when viewed. A rotor feed screw that is screwed with the rotor of an electric valve having a valve body that moves linearly as the rotor of the electric motor rotates, and has a male screw on the outer periphery, and an attachment portion for the valve body at the end And a synthetic resin flange that is integrally fixed to the outer periphery of the male screw pipe, and further includes a valve full-close stopper for restricting movement of the rotor in the valve closing direction when fully closed. A method of manufacturing a rotor feed screw for an electric valve comprising a body,
Using a mold device that can be opened and closed to define a molding cavity of the flange body,
The mold apparatus is provided with a molding concave portion of the valve full-closed stopper, and a first positioning portion corresponding to the molding concave portion,
When the male screw pipe is matched with the first positioning portion, a second positioning portion is provided so that the threading start end portion of the male screw and the molding concave portion of the valve full-close stopper correspond to the position,
The male screw tube is attached to the mold apparatus such that the second positioning portion coincides with the first positioning portion,
A method of manufacturing a rotor feed screw for an electric valve, comprising: closing a mold device and then injecting molten resin into the cavity to manufacture a rotor feed screw.   The first positioning portion is a protruding portion or a stepped portion, and the second positioning portion is viewed from the axial direction of the male threaded tube that is in contact with the keyway or the stepped portion that engages with the protruding portion. 4. The method of manufacturing a rotor feed screw for an electric valve according to claim 3, wherein the rotor feed screw is a notch cut into a D-shape. A rotor of an electric valve provided with a valve body that moves linearly when the rotor of the electric motor rotates, and further restricts valve closing for restricting movement of the rotor in the valve closing direction when fully closed A motor-operated valve rotor comprising a cylindrical rotor body that has a stopper and is entirely molded of a synthetic resin, and a bush that has an internal thread on the inner periphery and is integrally fixed to the inner periphery of the rotor body A manufacturing method of
Using a mold device that can be opened and closed to define a molding cavity of the rotor body,
The mold apparatus is provided with a molding concave portion of the valve closing restriction stopper, and a first positioning portion corresponding to the molding concave portion,
When the bushing is matched with the first positioning portion, a second positioning portion is provided so that the threading start end portion of the female screw and the molding recessed portion of the valve closing restriction stopper correspond to each other in position.
The bush is attached to the mold apparatus such that the second positioning portion coincides with the first positioning portion,
A method for manufacturing a rotor for a motor-operated valve, wherein the rotor is manufactured by injecting molten resin into the cavity after closing the mold device.   The first positioning portion is a protruding portion or a step portion, and the second positioning portion is a key groove that engages with the protruding portion, or abuts against the step portion, as viewed from the axial direction of the rotor. The method for manufacturing a rotor for an electric valve according to claim 5, wherein the motor valve rotor is a notch cut into a D-shape.