JP5707073B2 - 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, a motor-operated valve 51 described in Patent Document 1 or 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. And a valve body 53 that opens and closes the hole 52a, and the valve body 53 is driven in the vertical direction by a drive mechanism 59 provided in a can 57 protruding upward from the valve body 54 to control the flow rate of fluid such as refrigerant. I do.

  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 rotates, the valve shaft holder 61 fixed by the retaining ring 60 and the caulking portion 61a rotates accordingly, and the screw feed action between the valve shaft holder 61 and the male screw pipe 62 fixed to the valve main body 54. Then, the valve body 53 is moved up and down to open and close the valve hole 52a. Reference numeral 63 denotes a movable stopper attached to the valve shaft holder 61 and is configured to abut against a fixed stopper 55 caulked to the male screw pipe 62 when the valve is closed.

  In addition, as an electromagnetic coil used for the motor-operated valve, Patent Document 2 includes two bobbin portions in which a coil is wound around a bobbin body and an outer peripheral portion of the coil is covered with a resin mold, and a magnetic pole plate is provided between them. A bobbin part or resin mold is formed with a protruding part, and both the bobbin part is covered with a stator cover and fixed, thereby miniaturizing the electromagnetic coil that does not require countermeasures against rust on the welded part. Has been.

  Further, the motor-operated valve as described above is configured so that a movable stopper provided on the rotor is brought into contact with a fixed stopper provided on the valve body side when the valve is closed. A technique is described in which a fixed stopper is formed integrally with a male threaded tube that is brought into contact with and separated from the valve seat, and a movable stopper is formed integrally with a sleeve of the rotor.

  On the other hand, in the motor-operated valve having the stopper, in order to prevent the displacement of the rotor position and the generation of noise when both stoppers are in contact with each other, Patent Document 4 discloses a predetermined excitation pole of the stator coil when both stoppers are in contact. And a predetermined magnetic pole of the rotor (hereinafter referred to as “magnetic pole alignment”) are disclosed.

JP 2004-353679 A JP-A-2005-287152 Japanese Patent No. 3310042 JP-A-63-73864

  However, since the motor-operated valve described in Patent Document 4 includes a spiral guide ring or a slider that moves up and down along the ring as a stopper, the motor-operated valve increases in size and spirals. There is no disclosure about the positioning method of the stoppers arranged at both ends of the guide ring, and there is a possibility that the magnetic pole alignment may not be performed well depending on the skill of positioning of the stopper.

  Therefore, the present invention has been made in view of the problems in the above-described conventional motor-operated valve, and an object thereof is to provide a motor-operated valve capable of reliably performing the magnetic pole alignment with a small and simple configuration. .

In order to achieve the above object, the present invention provides a motor-operated valve having a valve body and a valve seat, a rotor supported by the valve body, and rotating by exciting a stator coil in the stator. The first screw member rotating with the rotation of the rotor, the second screw member supported by the valve body and screwed into the first screw member, and the first screw member rotating, A valve body that contacts and separates from the valve seat, a movable side stopper that rotates as the rotor rotates, and a valve closing direction of the first screw member that contacts the movable side stopper when the valve body is at the lowest position. A fixed-side stopper provided on the second screw member for restricting rotation of the rotor, and a contact surface between the predetermined magnetic pole of the rotor and the fixed-side stopper of the movable-side stopper is respectively the center of the rotor Will be at a predetermined angle Placed by the stator and the second screw member by directly engaged with the conduit communicating with said valve chamber said stator and said second threaded member placing the conduit as a reference, of the fixed side stopper The contact surface with the movable stopper and the predetermined excitation pole of the stator coil are arranged so as to be at the predetermined angle with respect to the center of the rotor, respectively.

  According to the present invention, with a small and simple configuration, when the movable side and fixed side stoppers are brought into contact with each other, magnetic pole alignment can be reliably performed so that the exciting pole of the stator coil and the magnetic pole of the rotor are opposed to each other. In addition, the vibration contact noise and valve opening pulse tolerance at the initialization of the motor-operated valve can be reduced as compared with the case where the magnetic pole alignment is not performed.

  In the motor-operated valve, the first screw member may be a male screw member, and the second screw member may be a female screw member.

  In the motor-operated valve, the movable stopper can be integrated with the rotor, and the number of parts can be reduced.

  In the motor-operated valve, the conduit may protrude into the valve chamber, and the second screw member may be provided with an engagement groove that engages with the conduit in the valve chamber.

  Further, in the motor-operated valve, the stator is configured to include a pipe fixing bracket that can be engaged with the conduit, and the stator is disposed around the rotor by the pipe fixing bracket engaging with the conduit. Can be configured.

  As described above, according to the present invention, it is possible to provide a motor-operated valve capable of reliably performing magnetic pole alignment with a small and simple configuration.

It is a whole sectional view showing the fully closed state of one embodiment of the electric valve concerning the present invention. It is a figure for demonstrating the phase alignment of the coil excitation pole (excitation tooth) of the stator coil of the motor-driven valve of FIG. 1, and a pipe fixing metal fitting, Comprising: (a) is a partially broken front view, (b) is a top view. It is. It is a figure for demonstrating the phase alignment with the magnetizing phase of the rotor of the motor operated valve of FIG. 1, and the contact surface of a stopper, (a) is a partially broken front view, (b) is a top view. It is a figure for demonstrating the phase alignment of the contact surface of the stopper of the valve stem holder of the motor operated valve of FIG. 1, and the pipe alignment part of a valve stem holder, (a) is a front view, (b) is a top view. It is. It is the exploded view and assembly drawing for demonstrating the structure for performing the magnetic pole alignment of the motor operated valve of FIG. It is a whole sectional view showing the fully opened state of the motor-operated valve of FIG. It is a figure for demonstrating the method of the magnetic pole alignment of the motor operated valve concerning this invention, (a) is a figure explaining one Embodiment of FIGS. 1-6, (b) demonstrates other embodiment. FIG. It is a whole sectional view showing an example of the conventional electric valve.

  Next, an embodiment for carrying out the present invention will be described in detail with reference to the drawings. In the following description, an overall configuration of an embodiment of a motor-operated valve according to the present invention will be described first, and then a detailed configuration that enables magnetic pole alignment with a small and simple configuration will be described.

  As shown in FIG. 1, a motor-operated valve 1 according to the present invention includes a valve main body 5 including two conduits 2 and 3 and a valve seat 4, a can 6 joined to the valve main body 5, The rotor 7 constituting a part of the electric motor, the stator coil 21 fixed to the outer periphery of the can 6 and rotationally driving the rotor 7, and the valve shaft (male screw member) integrally connected to the rotor 7 10, a valve shaft holder (female screw member) 11 having a lower end fixed to the valve body 5 via a joining ring 19, the valve shaft 10 being inserted therein, and a valve holder fixed by caulking to the lower end of the valve shaft 10 13, and a valve body 12 that is pressed downward by a lower end portion of the valve holder 13 via a coil spring 14 and a hook-shaped member 18.

  The valve body 5 is formed in a cylindrical shape, and the conduit 2 penetrates the valve body 5 and is fixed to the valve body 5 by welding in a state where the tip 2b of the conduit 2 protrudes into the valve chamber 5a. The conduit 3 is fixed to the bottom of the valve body 5 via the valve seat 4. The valve chamber 5 a communicates with two flow paths 2 a and 3 a formed by the two conduits 2 and 3. The valve seat 4 is located between the valve chamber 5a and the flow path 3a, and the motor-operated valve 1 is opened and closed by bringing the valve body 12 into and out of contact with the valve seat 4.

  The can 6 is formed in a cylindrical shape having an open bottom and a closed top, and is joined to the top of the valve body 5. Main components such as the rotor 7 are accommodated in the can 6.

  The rotor 7 is formed in a cylindrical shape, and is disposed rotatably inside the can 6. The upper portion of the rotor 7 is integrally connected to the valve shaft 10, and the fully closed upper stopper portion 7 a is integrally formed on the rotor 7 so as to protrude toward the upper surface of the valve shaft holder 11. The rotor 7 forms a stepping motor with a stator including a stator coil 21 disposed outside the can 6 and rotates by energization excitation of the stator coil 21. The stator coil 21 is fixed to the conduit 2 by a pipe fixing bracket 22.

  The valve shaft 10 has a male screw portion 10a threaded over substantially the entire length, the rotor 7 is integrally connected to the upper portion, and the valve holder 13 is caulked and fixed to the lower end portion 10b.

  The valve holder 13 is formed in a cylindrical shape that opens downward and has a closed upper portion, and the upper ceiling portion is caulked and fixed to the lower end portion 10 b of the valve shaft 10. A coil spring 14 is mounted inside the valve holder 13 and presses the valve body 12 via a hook-like member 18 formed in a convex shape downward. Above the valve holder 13, there is provided a fully open stopper 17 that is screwed and fixed to the male threaded portion 10 a of the valve shaft 10.

  The valve shaft holder 11 has a female threaded portion 11a threaded in the upper portion, and a lower portion disposed on the outer periphery of the valve holder 13, a lower end portion 11c opening downward, and a cylindrical shape including a ceiling portion 11e. The fitting insertion part 11b is provided. The lower end portion 11 c of the fitting insertion portion 11 b is fixed to the upper portion of the valve main body 5 via the joining ring 19. Then, the female screw portion 11a of the valve shaft holder 11 and the male screw portion 10a of the valve shaft 10 are screwed together, and the valve shaft 10 is guided in the vertical direction inside the valve shaft holder 11. Further, a fully-closed stopper portion 11d is provided on the upper surface of the valve shaft holder 11, and a fully-open stopper portion 11f is provided on the surface of the ceiling portion 11e on the valve holder 13 side. On the side surface of the valve holder 13, a pressure equalizing hole 15 is provided for equalizing the pressure between the valve chamber 5 a and the inside of the valve holder 13.

  The valve body 12 has a conical portion at the lower portion, and is formed in a cylindrical shape as a whole. The upper portion 12 a of the valve body 12 is inserted into the valve holder 13 and is latched and locked by the locking ring 16.

  Next, a detailed configuration for performing magnetic pole alignment of the motor-operated valve 1 having the above configuration will be described.

(1) Phase alignment of the coil excitation poles (excitation teeth) 21a of the stator coil 21 and the pipe fixing bracket 22 The coil excitation poles 21a of the stator coil 21 are arranged at 12 evenly per stage as shown in FIG. The magnetic poles are shifted so that the upper and lower four stages are arranged. Therefore, in the case of 1-2 phase excitation, 12 × 2 × 4 = 96, and the rotor 7 makes one rotation with 96 pulses. Here, as shown in FIG. 2, a predetermined coil excitation pole 21a of the stator coil 21 and a center 22a of the pipe fixing bracket 22 are arranged on the same straight line in the radial direction.

(2) Phase alignment between the magnetized phase of the rotor 7 and the contact surface 7c of the fully closed stopper portion 7a As shown in FIG. 3, the rotor 7 is formed by, for example, a bond magnet and has different polarities alternately in the circumferential direction. It is a cylindrical magnet rotor that is magnetized in such a manner that it is magnetized 24 poles around the entire circumference. Here, the predetermined magnetic pole 7b of the rotor 7 and the contact surface (contact surface) 7c of the fully closed upper stopper portion 7a are arranged on the same straight line in the radial direction.

(3) Phase alignment of the contact surface 11g of the fully closed stopper portion 11d of the valve shaft holder 11 and the pipe alignment portion 11h of the valve shaft holder 11 as shown in FIG. A closing stopper portion 11d is projected, and a pipe alignment portion (notch portion) 11h is formed at the lower portion thereof for inserting and engaging the distal end 2b of the conduit 2 protruding into the valve body 5 to perform alignment. Is done. The width of the pipe alignment portion 11h is approximately the same as the diameter of the conduit 2. Here, the contact surface (contact surface) 11g of the fully-closed stopper portion 11d and the center 11j of the pipe alignment portion (engagement groove) 11h are arranged on the same straight line in the radial direction. The joint ring 19 integrated with the valve shaft holder 11 has three through holes 19a, and the valve shaft holder 11 faces each of the three through holes 19a. The communication groove 11k is formed in the axial direction. The communication hole 11k and the through hole 19a function to introduce the fluid in the valve chamber 5a into the can 6 and to equalize the inside of the can 6.

  1 and 5, the valve shaft 10 is first attached to the valve holder 13, and the coil spring 14, the hook-shaped member 18, and the valve body 12 are inserted into the valve holder 13. These are arranged inside the valve holder 13 by the locking ring 16. Then, the fully open stopper 17 is screwed onto the valve shaft 10.

  Next, the valve shaft 10 is screwed into the female threaded portion 11a of the valve shaft holder 11, the valve holder 13 is accommodated in the valve shaft holder 11, and the distal end portion 2b of the conduit 2 protruding into the valve chamber 5a in this state. The pipe alignment portion 11 h is engaged with the valve shaft holder 11, and then the valve shaft holder 11 is fixed to the valve body 5. Thereby, the conduit 2 and the contact surface 11g are arranged on the same radial line.

  Then, the rotor 7 is fixed to the valve shaft 10. The rotor 7 is fixed to the valve shaft 10 when the valve element 12 is in the fully closed position (that is, the valve element 12 is in the lowest lowered position and the coil spring 14 is slightly compressed). The contact surface 7c of 7a and the contact surface 11g of the fully closed stopper portion 11d are in contact with each other. Thereafter, the can 6 is attached to the valve body 5.

  When the assembly on the valve body 5 side is completed in this manner, the stator including the stator coil 21 is then put on the can 6 and fixed to the conduit 2 via the pipe fixing bracket 22.

  With such a configuration, as shown in FIGS. 5B and 5D (a series of drawings in the right column), the predetermined coil excitation pole 21a of the stator coil 21 and the valve shaft holder 11 are fully closed. The contact surface 11g of the stopper portion 11d is fixed so as to be arranged on the same straight line in the radial direction (coincidence in a top view) via the pipe fixing bracket 22, the conduit 2 and the pipe alignment portion 11h. Further, as described above, the predetermined magnetic pole 7b of the rotor 7 and the contact surface 7c of the fully-closed upper stopper portion 7a are arranged on the same straight line in the radial direction. Therefore, as shown in FIG. When the contact surface 11g of the fully-closed stopper portion 11d of the valve shaft holder 11 and the contact surface 7c of the fully-closed stopper portion 7a of the rotor 7 come into contact with each other (that is, when the valve body 12 is at the lowest position). In addition, the predetermined magnetic pole 7b of the rotor 7 and the predetermined coil exciting pole 21a of the stator coil 21 can be directly opposed to each other, so that magnetic pole alignment can be performed reliably.

  Next, the operation of the motor-operated valve 1 having the above configuration will be described with reference to FIGS.

  When the motor-operated valve 1 is closed, for example, when the stator coil 21 is energized and energized in one direction in the state of FIG. 6, the rotor 7 rotates in the clockwise direction as viewed from above, and at the same time, the valve shaft 10 rotates and descends. 12 is inserted into the valve seat 4.

  After the valve body 12 is inserted to a predetermined position in the valve seat 4, the rotor 7 further rotates, the valve body 12 and the valve seat 4 come into contact with each other, and the valve body 12 is brought into contact with the valve seat 4 by the coil spring 14. In the biased state, the fully-closed stopper portion 7a of the rotor 7 comes into contact with the fully-closed stopper portion 11d of the valve shaft holder 11, and the lowering of the valve shaft 10 is forcibly stopped, with the posture shown in FIG. The operation ends.

  When the fully closed stopper portion 7a of the rotor 7 is in contact with the fully closed stopper portion 11d of the valve shaft holder 11, the predetermined magnetic pole 7b of the rotor 7 and the stator coil 21 are obtained by the magnetic pole alignment structure shown in FIG. And the predetermined coil excitation pole 21a coincide with each other.

  On the other hand, when the motor-operated valve 1 is opened, for example, when the stator coil 21 is energized in the direction opposite to the above in the state shown in FIG. 1, the rotor 7 rotates counterclockwise as viewed from above and the valve shaft 10 also rotates. Rotation rises, the valve body 12 leaves | separates from the valve seat 4, and the motor operated valve 1 opens.

  The present invention is not only applied to the type in which the valve body 12 closes the valve seat 4 as described above, but also to the type in which the valve body does not completely close the valve seat when the valve is closed. It can also be applied.

  Next, the operation at the time of initialization of the motor-operated valve 1 will be described.

  In order to accurately control the opening degree of the motor-operated valve 1, the valve body 12 is once closed at the start of the opening control, and the opening control of the motor-operated valve 1 is started with this valve closing position as the origin. As a method for determining the origin, first, the stator coil 21 of the stepping motor is energized by adding the number of pulses taking into account various errors to the number of pulses required from the fully open state to the fully closed state.

  In the motor-operated valve 1 in which the valve body 12 closes the valve seat 4 when fully closed, the number of pulses supplied to the stator coil 21 for obtaining the origin is such that the valve body 12 contacts the valve seat 4. After that, the number of pulses in consideration of various errors is added to the number of pulses required until the stoppers 7a and 11d abut and the rotation of the rotor 7 stops. At this time, if the magnetic poles are properly aligned, the generation of vibration contact noise when the motor-operated valve 1 is initialized is reduced.

  Further, in the motor-operated valve 1 in which the valve body 12 closes the valve seat 4 when fully closed as described above, the valve body 12 abuts on the valve seat 4 in order to supply the pulse in the valve opening direction for obtaining the origin. Thereafter, the compression of the coil spring 14 until the fully closed upper stopper portion 7a comes into contact with the fully closed stopper portion 11d is released.

  Here, assuming that the phase in which the pulse supply is stopped is a coil excitation pole 21a (the magnetic pole S in FIG. 2B), if the magnetic pole alignment is not properly performed, the coil excitation pole 21a and the rotor 7 The balance with the magnetic pole 7b (the magnetic pole N in FIG. 3B) may change due to a slight deviation of the magnetic pole, and the rotor 7 may rotate in a balanced direction (for example, the valve opening direction).

  For this reason, in some cases, the compression of the coil spring 14 is released before the predetermined number of pulses are supplied in the valve opening direction, or the coil spring 14 is compressed even if the predetermined number of pulses are supplied in the valve opening direction. May not be released, it is necessary to set the number of pulses in the valve opening direction in consideration of the pulses that the rotor 7 rotates in the valve opening direction.

  Here, if the magnetic pole alignment is properly performed, the stopper portions 7a and 11d always stop in contact with each other. Therefore, if a predetermined number of pulses are supplied in the valve opening direction, the flow rate control is surely performed. Be started. Thus, since the pulse supply in the valve opening direction can be set without considering the extra pulse, the positional accuracy of the valve body 12 when the flow control is disclosed is improved.

  On the other hand, even in a motor-operated valve in which the valve element does not close the valve seat when fully closed, the occurrence of vibration contact noise when the motor-operated valve is initialized is reduced if the magnetic poles are properly aligned.

  In addition, after the pulse supply is stopped, a predetermined number of pulses are supplied in the valve opening direction of the motor-operated valve, and the position where the supply of the pulse is stopped is set as a flow control start position (origin search). Flow control is started. The supply of the predetermined number of pulses in the valve opening direction can be set without considering extra pulses by appropriately performing magnetic pole alignment, so that the valve position accuracy at the start of flow rate control is improved.

  Now, another embodiment of the present invention will be described with reference to FIG.

  7A and 7B show the excitation pole of the stator coil 21 and the contact surface 11g of the fully closed lower stopper portion 11d, the magnetic pole of the rotor 7 and the magnetic pole of the fully closed upper stopper portion 7a in the direction of the central axis of the rotor. It is the figure seen from.

  In the above-described embodiment, as shown in FIG. 7A, the predetermined magnetic pole 7b (the center part) of the rotor 7 and the contact surface 7c of the fully closed upper stopper part 7a are the same in the radial direction. The angle formed by the straight line connecting the center of the rotor and the predetermined magnetic pole 7b (the center thereof) and the straight line connecting the center of the rotor and the contact surface 7c is “0” degrees so as to be arranged on a straight line. As described above, the predetermined magnetic pole 7b and the contact surface 7c are arranged, and the contact surface 11g of the fully-closed stopper portion 11d and the predetermined excitation pole 21a (the center portion) of the stator coil 21 are in the radial direction. Are arranged on the same straight line (that is, the angle formed by the straight line connecting the rotor center and the contact surface 11g and the straight line connecting the rotor center and the excitation pole 21a (the center thereof) is "0" degrees. 11g, the contact surface Fine excitation electrode 21a is assumed to be located.

  However, the present invention is not limited to this. As shown in FIG. 7B, the straight line connecting the center of the rotor and the predetermined magnetic pole 7b (the center thereof), the center of the rotor and the contact surface. The predetermined magnetic pole 7b and the contact surface 7c are arranged so that the angle formed by the straight line connecting 7c becomes a predetermined angle θ, and the straight line connecting the center of the rotor and the contact surface 11g, the center of the rotor, and the predetermined You may make it arrange | position the contact surface 11g and the excitation pole 21a so that the angle which the straight line which connects the excitation pole 21a (center part) may turn into the said predetermined angle (theta).

  In other words, in the present invention, the predetermined magnetic pole 7b (the central portion) of the rotor and the contact surface 7c of the fully-closed upper stopper portion 7a are each set at a predetermined angle θ (angle “0”) with respect to the center of the rotor. The contact surface 11g of the fully-closed stopper portion 11d and the predetermined excitation pole 21a (the center portion) of the stator are respectively set to the predetermined angle θ with respect to the center of the rotor. What is necessary is just to arrange | position.

  In the other embodiment shown in FIG. 7B as well, as in the embodiment shown in FIG. 7A, the contact surface 11g of the fully-closed stopper portion 11d and the fully-closed stopper portion 7a When the contact surface 7c contacts, the predetermined magnetic pole 7b of the rotor 7 and the predetermined excitation pole 21a of the stator coil 21 can face each other.

DESCRIPTION OF SYMBOLS 1 Motorized valve 2 Conduit 2a Flow path 2b Tip part 3 Conduit 3a Flow path 4 Valve seat 5 Valve body 5a Valve chamber 6 Can 7 Rotor 7a Fully closed upper stopper part 7b Magnetic pole 7c Contact surface 10 Valve shaft 10a Male thread part 10b Lower end part 11 Valve shaft holder 11a Female thread part 11b Insertion part 11c Lower end part 11d Fully closed stopper part 11e Ceiling part 11f Fully open stopper part 11g Contact surface 11h Pipe alignment part (notch part)
11j Center 12 Valve body 12a Upper part 13 Valve holder 14 Coil spring 15 Pressure equalizing hole 16 Locking ring 17 Fully opened lower stopper 18 Gutter-shaped member 19 Joint ring 19a Through hole 21 Stator coil 21a Coil exciting pole 22 Pipe fixing bracket 22a Center

Claims (5)

A valve body with a valve chamber and a valve seat;
A rotor supported by the valve body and rotating by exciting a stator coil in the stator;
A first screw member that rotates as the rotor rotates;
A second screw member supported by the valve body and screwed into the first screw member;
A valve body that contacts and separates from the valve seat by rotating the first screw member;
A movable stopper that rotates as the rotor rotates;
A fixed-side stopper provided on the second screw member for restricting rotation of the first screw member in the valve-closing direction by contacting the movable-side stopper when the valve body is at the lowest position;
The contact surfaces of the predetermined magnetic pole of the rotor and the fixed side stopper of the movable side stopper are arranged so that each has a predetermined angle with respect to the center of the rotor,
The stator and the second screw member are directly engaged with a conduit communicating with the valve chamber, and the stator and the second screw member are disposed with reference to the conduit , whereby the movable-side stopper of the fixed-side stopper. And a predetermined excitation pole of the stator coil are arranged so as to be at the predetermined angle with respect to the center of the rotor. The first screw member is a male screw member;
The second threaded member includes an electric valve according to claim 1, characterized in that the female I Flip member.   The electric valve according to claim 1, wherein the movable side stopper is integrated with the rotor. The conduit projects into the valve chamber;
The motor-operated valve according to any one of claims 1 to 3, wherein the second screw member includes a notch that engages with the conduit in the valve chamber. The stator includes a pipe fixture that can be engaged with the conduit;
The motor-operated valve according to any one of claims 1 to 4, wherein a stator is disposed around the rotor by the pipe fixing metal fitting being engaged with the conduit.