JP5563862B2 - Motorized valve - Google Patents

Description

  The present invention relates to a motor-operated valve used for refrigerant flow control in a refrigeration cycle system.

  As an example of the motor-operated valve, the motor-operated valve described in Patent Document 1 and the like includes a valve body 52 having a valve chamber 52 and a valve hole 52a formed in the valve chamber 52, as shown in FIG. A valve body 53 that opens and closes the valve body 52a, and a drive mechanism 59 provided in a can 57 protruding upward from the valve body 54 drives the valve body 53 in the vertical direction to control fluid such as a refrigerant. .

  The valve mechanism 53 is driven by the driving mechanism 59 by a stepping motor including a rotor 56 provided inside the can 57 and a stator 58 fitted on the can 57. When the rotor 56 is rotated, the retaining ring 60 and the valve shaft holder 61 are rotated accordingly, and the valve body 53 is moved up and down by the screw feeding action of the valve shaft holder 61 and the screw pipe 62 fixed to the valve main body 54. Thus, the valve hole 52a is opened and closed.

JP 2004-353679 A

  However, in the conventional motor-operated valve 51, when the drive mechanism 59 is configured, the stop ring 60 and the rotor 56 are integrally formed by insert molding, and the upper protrusion of the valve shaft holder 61 protrudes into the inner peripheral hole portion of the stop ring 60. The portion 61a is fitted and the outer periphery of the protrusion 61a is caulked and fixed to integrally connect the rotor 56, the retaining ring 60 and the valve shaft holder 61, and the valve shaft 53 is restricted from descending by the valve shaft holder 61. Since the upper stopper body 63 is mounted, there is a problem that the number of parts is large and the manufacturing is troublesome.

  Therefore, the present invention has been made in view of the problems in the above-described conventional motor-operated valve, and provides a motor-operated valve with a low manufacturing cost by reducing the number of parts and simplifying the manufacturing process. Objective.

In order to achieve the above object, the present invention provides a motor-operated valve, a valve body having a valve chamber and a valve hole formed in the valve chamber, a valve body for opening and closing the valve hole, and a protrusion from the valve body. A can, a stator coil disposed outside the can, a rotor disposed inside the can and rotated by energizing excitation of the stator coil, a screw tube fixed to the valve body, and the rotor A valve shaft holder that is formed to be rotatable and that opens and closes the valve hole by the valve body through the valve shaft by a screw feeding action with the screw tube, and is interposed between the valve shaft holder and the valve shaft. A valve closing spring that urges the valve body through the valve shaft in a closing direction of the valve hole, and is fixed to the valve shaft, and in cooperation with the valve closing spring, the valve body is the valve Relative movement of the valve shaft holder and the rotor in the direction of opening and closing the hole Characterized in that it comprises a stopper to prevent.

  According to the present invention, the valve shaft holder is formed so as to be rotatable together with the rotor, and the valve closing spring and the stopper prevent relative movement between the valve shaft holder and the rotor in the direction in which the valve body opens and closes the valve hole. Therefore, the number of parts can be reduced, the manufacturing process can be simplified, and the manufacturing cost of the motor-operated valve can be reduced.

  In the motor-operated valve, the valve shaft holder and the rotor can be made of resin, which can further reduce the manufacturing cost. Further, the valve shaft holder can be integrally provided with a stopper portion that constitutes a stopper mechanism that restricts the movement of the valve body in the direction of closing the valve hole when the valve is closed, thereby further reducing the number of parts. This can be reduced, and the manufacturing cost of the electric valve can be further reduced.

  Further, the valve shaft holder has a plurality of protrusions extending on the outer surface in a direction in which the valve element opens and closes the valve hole, and the rotor is formed on the inner surface with the plurality of protrusions. The valve shaft holder can be configured to be rotatable together with the rotor by having a plurality of engaging groove portions and engaging the plurality of groove portions with the plurality of protrusions.

  Furthermore, the valve shaft holder has a D-cut section having a D-shaped cross section when the valve body is viewed from the direction in which the valve hole opens and closes the valve hole, and the rotor has a hole portion engaged with the D-cut section. The valve shaft holder can be configured to be rotatable together with the rotor by engaging the hole and the D-cut portion.

  As described above, according to the present invention, it is possible to provide an electric valve with low manufacturing cost by reducing the number of parts and simplifying the manufacturing process.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows 1st Embodiment of the electrically operated valve concerning this invention, Comprising: (a) is sectional drawing, (b) is the sectional view on the AA line of (a) (However, (b) is a can. Only the interior of the can is shown, and the entire interior of the can is depicted in (a)). It is a figure which shows 2nd Embodiment of the motor operated valve concerning this invention, Comprising: (a) is sectional drawing, (b) is BB sectional drawing of (a), (c) is C of (a). (C) is a cross-sectional view taken along line C (however, (b) and (c) show only the inside of the can, and (a) shows that the entire inside of the can is drawn). It is sectional drawing which shows an example of the conventional motor operated valve.

  Next, an embodiment for carrying out the present invention will be described in detail with reference to the drawings.

  FIG. 1 shows a first embodiment of a motor-operated valve according to the present invention. The motor-operated valve 1 includes a valve chamber 2, a valve body 4 having a valve hole 2a in the valve chamber 2, and a lower end portion of the valve shaft 3. A valve body 3a that opens and closes the valve hole 2a, a can 11 that protrudes from the valve body 4, a stator coil 18 that is disposed outside the can 11, and a rotor 6 that is rotated by energization excitation of the stator coil 18. A valve tube holder 8 fixed to the valve body 4 and a valve shaft holder 8 formed so as to be rotatable together with the rotor 6 and moving the valve body 3a up and down via the valve shaft 3 by screw feeding action with the screw tube 7. A valve closing spring 9 interposed between the valve shaft holder 8 and the valve shaft 3 and biasing the valve body 3a in the direction of the valve hole 2a via the valve shaft 3, and the vertical direction of the valve shaft holder 8 and the rotor 6 The stopper 17 is configured to prevent relative movement of the valve in cooperation with the valve closing spring 9.

  Fluid inlet / outlet pipes 13 and 14 are connected to the side and lower parts of the valve body 4 so as to communicate with the valve chamber 2. A valve hole 2a is formed in the valve chamber 2 in the valve body 4, and the flow rate of the fluid is controlled by a gap between the valve hole 2a and the valve body 3a.

  The lower end portion of the covered cylindrical can 11 is butt welded to the stepped portion of the flange-like plate 16 that is caulked and fixed to the valve body 4. Inside the can 11, the rotor 6 that drives the valve body 3 a in the vertical direction, A screw tube 7, a valve shaft holder 8, a valve shaft 3, and the like are disposed.

  The rotor 6 is formed into a cylindrical shape by mixing metal magnetic powder and resin, and includes a plurality of grooves 6a extending in the vertical direction in FIG. The rotor 6 is configured to be rotatable together with the valve shaft holder 8 by the plurality of grooves 6 a and a plurality of protrusions 8 a that are also extended in the vertical direction on the outer surface of the valve shaft holder 8. Further, a stopper 17 which is in contact with the upper surface of the rotor 6 and the valve shaft holder 8 at the disc-shaped portion 17 a and the cylindrical portion 17 b is welded and fixed to the upper reduced diameter portion 3 b of the valve shaft 3, and the valve closing spring 9. The rotor 6 and the valve shaft holder 8 are clamped, and their relative movement in the vertical direction is restricted.

  The rotor 6 forms a stepping motor with the stator including the stator coil 18 disposed outside the can 11 and rotates by energization excitation of the stator coil 18. A plurality of lead terminals 22 are connected to the stator coil 18, and a plurality of lead wires 24 are connected to these lead terminals 22 via a substrate 23.

  The valve shaft holder 8 is resin-molded into a cylindrical shape with a lower opening located outside the screw tube 7, and a female screw portion 8 b that is screwed with the male screw portion 7 a of the screw tube 7 is screwed on the inner peripheral surface thereof. The valve shaft holder 8 is integrally provided with an upper stopper portion 8c at the lower portion so as to come into contact with the lower stopper body 5 fixed to the screw tube 7.

  The valve shaft 3 is integrally provided with a valve body 3a at a lower end portion thereof, and is inserted into the center of the valve shaft holder 8 so as to be vertically movable. The valve shaft 3 is always urged downward by a valve closing spring 9 that is mounted in the valve shaft holder 8.

  The threaded tube 7 has a male threaded portion 7a threaded on the outer peripheral surface thereof, and a lower stopper body 5 constituting one of the stopper mechanisms is fixed thereto. As described above, the lower stopper body 5 is configured to be able to contact the upper stopper portion 8 c of the valve shaft holder 8.

  At the upper end of the valve shaft 3, the valve shaft 3 moves too much upward during operation, and when the male threaded portion 7 a of the screw tube 7 and the female threaded portion 8 b of the valve shaft holder 8 are disengaged, the valve shaft holder A return spring 10 for biasing 8 toward the screw tube 7 is provided.

  In the motor-operated valve 1 having the above-described configuration, when the stator coil 18 is excited by energizing the stator coil 18 in one direction via the lead wire 24, the substrate 23, and the lead terminal 22, the rotor 6 rotates. Rotates relative to the threaded tube 7. Here, since the lower part of the screw tube 7 is fixed to the valve body 4, for example, the valve shaft holder 8 is moved by the screw feed mechanism of the male screw portion 7 a of the screw tube 7 and the female screw portion 8 b of the valve shaft holder 8. As a result, the valve shaft 3 is lowered, and the valve body 3a closes the valve hole 2a. In addition, when the upper stopper portion 8c of the valve shaft holder 8 and the lower stopper body 5 are in contact with each other, further lowering of the valve body 3a is restricted.

  Next, when the stator coil 18 is energized in the other direction and excited, the rotor 6 rotates relative to the screw tube 7 fixed to the valve body 4 in the opposite direction, and the screw feed mechanism causes the valve to rotate. The shaft holder 8 rises, and the valve body 3a at the lower end of the valve shaft 3 moves upward to open the valve hole 2a.

  As described above, according to the motor-operated valve 1, the mechanism for opening and closing the valve hole 2 a by moving the valve body 3 a up and down via the valve shaft 3 by the screw feeding action with the screw pipe 7 fixed to the valve body 4. 3 and the valve shaft holder 8 that can be rotated together with the rotor 6, and the upper stopper portion 8c is integrally formed with the valve shaft holder 8, the conventional electric valve 51 shown in FIG. In constructing a similar mechanism, four parts of the rotor 56, the retaining ring 60, the valve shaft holder 61, and the upper stopper body 63 are required, whereas the motorized valve 1 requires only two parts. Reduction can be achieved.

  In assembling the motor-operated valve 1, the resin-molded rotor 6 and the valve shaft holder 8 are integrally combined, and then both are held between the valve-closing spring 9 and the stopper 17. Thus, the manufacturing process can be simplified because the retaining ring 60 does not need to be caulked and fixed at the upper part of the valve shaft holder 61. Moreover, since the valve shaft holder 8 and the rotor 6 can be made of resin by adopting such a structure, an electric valve with low manufacturing cost can be provided in combination with the reduction of the number of parts.

  Next, a second embodiment of the motor-operated valve according to the present invention will be described with reference to FIG. In the following description, the same components as those of the motor-operated valve 1 shown in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted.

  The electric valve 31 according to the present embodiment includes a valve chamber 2, a valve body 4 having a valve hole 2a in the valve chamber 2, a valve body 3a that is formed at the lower end of the valve shaft 3 and opens and closes the valve hole 2a. The can 11 protruding from the valve body 4, the stator coil 18 arranged outside the can 11, the rotor 36 that rotates by energization excitation of the stator coil 18, the screw tube 7 fixed to the valve body 4, and the rotor 36 And a valve shaft holder 38 that moves up and down the valve body 3a through the valve shaft 3 by a screw feeding action with the screw tube 7, and is interposed between the valve shaft holder 38 and the valve shaft 3. The valve closing spring 9 that urges the valve body 3a in the direction of the valve hole 2a via the valve shaft 3 and the vertical movement of the valve shaft holder 38 and the rotor 36 are prevented in cooperation with the valve closing spring 9. It consists of a stopper 47 and the like.

  Inside the can 11, a rotor 36 for driving the valve body 3a in the vertical direction, a screw tube 7, a valve shaft holder 38, a valve shaft 3 and the like are arranged. In the present embodiment, the rotor 36, the valve shaft holder 38, The configuration of the stopper 47 is different from the rotor 6, the screw pipe 7 and the stopper 17 of the motor-operated valve 1 shown in FIG. 1.

  The rotor 36 is formed in a cylindrical shape by mixing metal magnetic powder and resin, and includes a D-shaped hole 36a and an engagement hole 36b as viewed from above. On the other hand, the valve shaft holder 38 includes a D-cut portion 38a that is D-shaped when viewed from above, and a non-rotating convex portion 38d. When the hole 36a and the D-cut portion 38a of the valve shaft holder 38 are engaged, and the rotation-preventing convex portion 38d of the valve shaft holder 38 is engaged with the engagement hole 36b of the rotor 36, the rotor 36 is It is comprised so that rotation with the valve-shaft holder 38 is possible. In addition, it is preferable to perform the fastening with the engagement hole 36b by deforming the rotation preventing projection 38d by ultrasonic welding. The rotor 36 is provided with a recess 36c for the purpose of improving moldability and the like. However, if refrigeration oil or liquid refrigerant accumulates in the rotor 36, a weight deviation or a change in the center of gravity occurs, which hinders operation. I have come. Therefore, in the present embodiment, a through hole 36d for discharging the refrigerating machine oil and the liquid refrigerant in the recess 36c to the outside is provided.

  Further, the stopper 47, which is in contact with the upper surface of the rotor 36 and the valve shaft holder 38 at the disk-shaped portion 47a and the cylindrical portion 47b is welded and fixed to the upper reduced diameter portion 3b of the valve shaft 3, and the valve closing spring 9 The rotor 36 and the valve shaft holder 38 are clamped to restrict the relative movement in the vertical direction. The rotor 36 forms a stepping motor with the stator including the stator coil 18 disposed outside the can 11 and rotates by energizing the stator coil 18.

  The valve shaft holder 38 is formed in a cylindrical shape with a lower opening located outside the screw tube 7, and includes the D-cut portion 38a and the non-rotating convex portion 38d as described above. A female screw portion 38b that is screwed with the male screw portion 7a of the screw tube 7 is screwed on the inner peripheral surface of the valve shaft holder 38, and an upper stopper that can come into contact with the lower stopper body 5 fixed to the screw tube 7 at the lower portion. The part 38c is projected integrally.

  In the motor-operated valve 31 having the above-described configuration, when the stator coil 18 is energized in one direction through the lead wire 24, the substrate 23, and the lead terminal 22, the rotor 36 rotates, and accordingly, the valve shaft holder 38 is rotated. Rotates relative to the threaded tube 7. Here, since the lower part of the screw tube 7 is fixed to the valve body 4, for example, the valve shaft holder 38 is moved by the screw feed mechanism of the male screw portion 7 a of the screw tube 7 and the female screw portion 38 b of the valve shaft holder 38. As a result, the valve shaft 3 is lowered, and the valve body 3a closes the valve hole 2a. The upper stopper portion 38c of the valve shaft holder 38 and the lower stopper body 5 come into contact with each other to limit further lowering of the valve body 3a.

  Next, when the stator coil 18 is energized in the other direction to be excited, the rotor 36 rotates relative to the screw tube 7 fixed to the valve body 4 in the opposite direction, and the screw feed mechanism causes the valve to rotate. The shaft holder 38 moves up, and the valve body 3a at the lower end of the valve shaft 3 moves upward to open the valve hole 2a.

  As described above, even with the motor-operated valve 31, a mechanism for opening and closing the valve hole 2a by moving the valve body 3a up and down via the valve shaft 3 by a screw feeding action with the screw tube 7 fixed to the valve body 4 is provided. Since the rotor 36 and the valve shaft holder 38 that can rotate together with the rotor 36 are configured, and the upper stopper portion 38c is formed integrally with the valve shaft holder 38, the conventional motor-operated valve 51 shown in FIG. The four components of the rotor 56, the retaining ring 60, the valve shaft holder 61 and the upper stopper body 63 are required to construct the mechanism of the motor, whereas the motor-operated valve 31 requires only two components, thus reducing the number of components. Can be achieved.

  Further, in assembling the motor-operated valve 31, the resin-molded rotor 36 and the valve shaft holder 38 are integrally combined, and then both are held between the valve-closing spring 9 and the stopper 47. Since it is not necessary to caulk and fix the retaining ring 60 at the upper part of the valve shaft holder 61 as in 51, the manufacturing process can be simplified, and a motorized valve with a low manufacturing cost can be provided in combination with the reduction in the number of parts. Can do.

  In the above embodiment, the valve shaft holders 8 and 38 are integrally formed with the upper stopper portions 8c and 38c constituting a stopper mechanism for restricting the movement of the valve body 3a in the closing direction when the valve is closed. However, the valve shaft holders 8 and 38 and the upper stopper portions 8c and 38c can be separated. Even in this case, the rotor 36 and the retaining ring 60 in the conventional motor-operated valve 51 shown in FIG. 3 can be formed as one part, and the rotors 6 and 36 and the valve shaft holders 8 and 38 as one part can be combined. It can be integrated easily, and the manufacturing cost of the motor-operated valves 1 and 31 can be reduced.

  Further, when the rotors 6 and 36 and the valve shaft holders 8 and 38 are integrally formed, a combination with the plurality of grooves 6a and the protrusions 8a as in the first embodiment, or as in the second embodiment. Regardless of the combination of the hole 36a and the D-cut portion 38a, for example, the two may be joined by one key, and various configurations can be applied as long as the two can be integrally rotated stably. Can do.

  Further, in the above embodiment, the case where the male screw is formed on the screw tube 7 and the female screw is formed on the valve shaft holders 8 and 38 has been described. However, the female screw is formed on the screw tube 7 and the male screw is formed on the valve shaft holders 8 and 38. May be.

DESCRIPTION OF SYMBOLS 1 Motorized valve 2 Valve chamber 2a Valve hole 3 Valve shaft 3a Valve body 3b Upper diameter reduction part 4 Valve body 5 Lower stopper body 6 Rotor 6a Groove part 7 Screw pipe 7a Male thread part 8 Valve shaft holder 8a Projection 8b Female thread part 8c Upper stopper Part 9 valve closing spring 10 return spring 11 can 13 outflow pipe 14 inflow pipe 16 bowl-like plate 17 stopper 17a disk-like part 17b cylindrical part 18 stator coil 22 lead terminal 23 substrate 24 lead wire 31 electric valve 36 rotor 36a hole 36b Engagement hole 36c Recess 36d Through hole 38 Valve shaft holder 38a D cut part 38b Female thread part 38c Upper stopper part 38d Non-rotating convex part 47 Stopper 47a Disk-like part 47b Cylindrical part

Claims (5)

A valve body having a valve chamber and a valve hole formed in the valve chamber;
A valve body for opening and closing the valve hole;
A can protruding from the valve body;
A stator coil disposed outside the can;
A rotor disposed inside the can and rotated by energization excitation of the stator coil;
A threaded tube fixed to the valve body;
A valve shaft holder that is formed so as to be rotatable together with the rotor, and that opens and closes the valve hole by the valve body via the valve shaft by a screw feeding action with the screw tube;
A valve closing spring interposed between the valve shaft holder and the valve shaft, and biasing the valve body in the valve hole closing direction via the valve shaft;
The stopper is fixed to the valve shaft and cooperates with the valve closing spring to prevent relative movement between the valve shaft holder and the rotor in a direction in which the valve body opens and closes the valve hole. Motorized valve.   The motor operated valve according to claim 1, wherein the rotor and the valve shaft holder are made of resin.   The said valve shaft holder is integrally provided with the stopper part which comprises the stopper mechanism which restrict | limits the movement to the direction which closes the said valve hole of the said valve body at the time of a valve closing. Motorized valve.   The valve shaft holder has a plurality of protrusions extending on the outer surface in a direction in which the valve element opens and closes the valve hole, and the rotor engages with the plurality of protrusions on the inner surface. The valve shaft holder is configured to be rotatable together with the rotor by engaging the plurality of grooves with the plurality of protrusions. The motor-operated valve in any one of 3.   The valve shaft holder has a D-cut portion having a D-shaped cross section when viewed from the direction in which the valve body opens and closes the valve hole, and the rotor has a hole portion that engages with the D-cut portion. 4. The motor-operated valve according to claim 1, wherein the valve shaft holder is configured to be rotatable together with the rotor when the hole portion and the D-cut portion are engaged with each other. 5. .

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