JP7254678B2 - Electric valve and refrigeration cycle system - Google Patents

Description

The present invention relates to an electrically operated valve and a refrigerating cycle system.

Conventionally, as a motor-operated valve provided in the refrigeration cycle of an air conditioner, a valve housing (valve main body) having a valve chamber inside and to which primary and secondary joints are connected, and an electromagnetic force from a coil are used to rotate. An electric motor (driving unit) having a magnet rotor and a rotor shaft (screw shaft), and a valve body that is driven forward and backward in the axial direction by the electric motor is known (for example, Patent Document 1 reference). In this electric valve, the needle valve (valve portion) of the valve body opens and closes the valve port of the valve chamber by driving the valve body forward and backward by the electric motor.

As shown in FIG. 8, a conventional motor-operated valve 90 includes a valve body 91 to which a primary joint 91a and a secondary joint 91b are connected, a screw shaft 92 fixed to a magnet rotor (not shown) of a drive section, an axis line It includes a valve body 93 that is driven to advance and retreat in the L direction, and a support member 94 that is fixed to the valve body 91 and guides the valve body 93 in the axis L direction. The valve main body 91 has a valve chamber 91c therein, a valve seat member 91d is fixed on the secondary joint 91b side, and the opening of the valve seat member 91d constitutes a valve port 91e. The valve body 93 has a needle valve (valve portion) 95 provided at its tip (lower end) for opening and closing the valve port 91 e , and a needle valve (valve portion) 95 that engages with the tip of the screw shaft 92 and is attached to the base end of the needle valve 95 . A fixed cylindrical valve holder 96, a spring bearing 97 built in the valve holder 96 and in contact with the distal end of the screw shaft 92 and separated from the proximal end of the needle valve 95, and the needle valve 95. A compression spring 98 interposed in a compressed state between the base end portion and the spring bearing 97, and a thrust washer 99 interposed between the tip end portion of the screw shaft 92 and the valve holder 96. It is configured.

In this motor-operated valve 90 , a magnet rotor of a drive unit (stepping motor) is rotationally driven by magnetic force, so that a screw shaft 92 rotates (positively rotates) around an axis L, and a male screw of the screw shaft 92 rotates toward a support member 94 . is guided by the internal thread of the , and moves back and forth (downward and upward) in the direction of the axis L. When the screw shaft 92 descends, the needle valve 95 is urged downward through the spring bearing 97 and the compression spring 98 with which the tip portion abuts, and the valve holder 96 fixed to the needle valve 95 moves against the support member 94. It descends while being guided, and the tip of the needle valve 95 is seated on the valve seat member 91d to close the valve port 91e. On the other hand, when the screw shaft 92 is reversely rotated around the axis L by the driving portion and raised, the tip thereof engages the valve holder 96 via the thrust washer 99, and the valve holder 96 is raised while being guided by the support member 94. Then, the tip of the needle valve 95 is separated from the valve seat member 91d to open the valve port 91e.

JP 2018-115743 A

However, in the conventional electric valve as described in Patent Document 1, when the screw shaft is lowered from the valve open state and the tip of the needle valve is seated on the valve seat member, the tip of the screw shaft rotates. Since the needle valve is urged downward via the contacting spring bearing and compression spring, if the spring bearing and compression spring are tilted, the urging force acting on the needle valve will not be uniform, and the needle valve will be positioned at the center of the valve port. You may be seated off-center or tilted to the axis. If the needle valve is seated in an eccentric or tilted state with respect to the valve port in this way, valve leakage, in which refrigerant leaks even though the valve is closed, may occur. Uneven stress concentration occurs in the contact portion with the member, and local deformation and wear may progress, resulting in a decrease in durability.

SUMMARY OF THE INVENTION An object of the present invention is to provide an electrically operated valve and a refrigeration cycle system that can improve sealing performance and durability by suppressing eccentricity and inclination of a valve portion with respect to a valve port.

A motor operated valve according to the present invention includes a valve body that opens and closes a valve port, a drive section that drives the valve body along the axial direction, and a guide section that guides the valve body in the axial direction. The drive unit has a drive shaft that moves back and forth in the axial direction, and the valve body includes a valve portion that contacts and separates from the valve port as the drive shaft moves back and forth, and the drive shaft. a hollow valve holder provided over a distal end portion of a shaft and a proximal end portion of the valve portion and guided by the guide portion; and a distal end portion of the drive shaft and the valve portion incorporated in the valve holder a spring bearing provided in contact with one of the base ends of the valve portion and spaced apart from the other; At least one of the distal end portion of the drive shaft and the proximal end portion of the valve portion, and the spring bearing restrict inclination of the spring bearing with respect to the axial direction. The spring bearing is provided with a rotary sliding surface that rotates and slides on either one of the distal end portion of the drive shaft and the proximal end portion of the valve portion. The restricting means extends in the axial direction from at least one of a hole opening in the rotational sliding surface of the spring bearing and extending in the axial direction, a distal end portion of the drive shaft, and a proximal end portion of the valve portion. a shaft that is inserted into the hole across the rotation sliding surface, and the length of insertion of the shaft into the hole is equal to or longer than the inner diameter of the hole.

According to this aspect of the invention, the valve body includes the valve portion, the valve holder, the spring bearing, and the compression spring. is connected via a tilt regulating means that regulates the tilt of the spring bearing. The eccentricity and inclination of the valve portion with respect to the valve port can be suppressed. Therefore, by seating the valve portion against the valve port without eccentricity or inclination, the occurrence of valve leakage is suppressed when the valve is closed, and local deformation and wear of the contact portion between the valve portion and the valve port is prevented. It can be suppressed to improve durability.

At this time, the valve holder is rotatably engaged with the distal end portion of the drive shaft and fixed to the proximal end portion of the valve portion, and the spring bearing is attached to the distal end portion of the drive shaft. The tilt regulating means is provided in contact with the sliding surface and separated from the base end of the valve portion, and the inclination restricting means includes the hole formed in the spring bearing and the tip end portion of the drive shaft. and a shaft portion, wherein the inner peripheral surface of the hole and the outer peripheral surface of the shaft portion are in sliding contact with each other and restrict mutual movement in a direction intersecting with the axial direction, thereby Preferably, the tilt is regulated.

Further, the valve holder is rotatably engaged with the distal end portion of the drive shaft and fixed to the proximal end portion of the valve portion, and the spring bearing is spaced apart from the distal end portion of the drive shaft. The rotation sliding surface is provided in contact with the proximal end of the valve portion, and the inclination restricting means includes the hole formed in the spring bearing and the valve portion formed at the proximal end of the valve portion. and a shaft portion, wherein the inner peripheral surface of the hole and the outer peripheral surface of the shaft portion are in sliding contact with each other and restrict mutual movement in a direction intersecting with the axial direction, thereby The tilt may be regulated.

The valve holder is fixed to the distal end of the drive shaft and rotatably engaged with the proximal end of the valve portion, and the spring bearing is separated from the distal end of the drive shaft. The rotation sliding surface is provided in contact with the proximal end of the valve portion, and the inclination restricting means includes the hole formed in the spring bearing and the valve portion formed at the proximal end of the valve portion. and a shaft portion, wherein the inner peripheral surface of the hole and the outer peripheral surface of the shaft portion are in sliding contact with each other and restrict mutual movement in a direction intersecting with the axial direction, thereby The tilt may be regulated.

The valve holder is rotatably engaged with the distal end of the drive shaft and is rotatably engaged with the base end of the valve portion, and the spring bearing is rotatably engaged with the distal end of the drive shaft. The tilt regulating means is provided in the hole formed in the spring bearing and the tip end of the drive shaft. and the shaft portion is formed, wherein the inner peripheral surface of the hole portion and the outer peripheral surface of the shaft portion are in sliding contact with each other and restricting mutual movement in a direction intersecting with the axial direction, An inclination of the spring bearing may be regulated.

The valve holder is rotatably engaged with the distal end of the drive shaft and is rotatably engaged with the base end of the valve portion, and the spring bearing is rotatably engaged with the distal end of the drive shaft. The tilt regulating means is provided in the hole formed in the spring bearing and the tip end of the drive shaft. a first shaft portion formed to constitute the shaft portion; and a second shaft portion extending in the axial direction from a proximal end portion of the valve portion and inserted into the hole, wherein the hole and the outer peripheral surfaces of the first and second shaft portions are in sliding contact with each other, and the inclination of the spring bearing is restricted by restricting mutual movement in the direction intersecting with the axial direction. may be

According to each of the above configurations, even when various valve portions having different structures are employed, as described above, eccentricity and inclination of the valve portion with respect to the valve port can be suppressed. On the other hand, the valve part is seated without eccentricity or inclination, suppressing the occurrence of valve leakage when the valve is closed, and improving durability by suppressing local deformation and wear of the contact part between the valve part and the valve port. can be made

A refrigerating cycle system of the present invention is a refrigerating cycle system including a compressor, a condenser, an expansion valve, and an evaporator, and any one of the motor-operated valves is used as the expansion valve. characterized by

According to the electrically operated valve and the refrigeration cycle system of the present invention, it is possible to improve sealing performance and durability by suppressing the eccentricity and inclination of the valve portion with respect to the valve port.

1 is a longitudinal sectional view showing an electrically operated valve according to a first embodiment of the invention; FIG. It is a longitudinal cross-sectional view which expands and shows the principal part of the said motor-operated valve. FIG. 7 is a vertical cross-sectional view showing an enlarged main part of an electrically operated valve according to a second embodiment of the present invention; FIG. 11 is a longitudinal sectional view showing an enlarged main part of a motor-operated valve according to a third embodiment of the present invention; FIG. 11 is a longitudinal sectional view showing an enlarged main part of a motor-operated valve according to a fourth embodiment of the present invention; FIG. 11 is a longitudinal sectional view showing an enlarged main part of a motor-operated valve according to a fifth embodiment of the present invention; It is a figure which shows the refrigerating-cycle system of this invention. FIG. 10 is a vertical cross-sectional view showing an enlarged main part of a motor-operated valve according to a conventional example of the present invention;

A motor operated valve according to a first embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. As shown in FIG. 1, a motor-operated valve 10A of this embodiment includes a valve housing 1, a valve body 2, and an actuator 3. As shown in FIG. Note that the concept of "up and down" in the following description corresponds to up and down in the drawing of FIG.

The valve housing 1 has a tubular valve main body 1A and a support member 1B fixed inside the valve main body 1A. The valve main body 1A has a cylindrical valve chamber 1C formed therein. A primary joint pipe 11 is attached to the valve main body 1A and communicates with the valve chamber 1C from the side surface to allow the refrigerant to flow thereinto. A secondary joint pipe 12 is attached to communicate with the valve chamber 1C and through which the refrigerant flows out. Further, a valve seat member 13 is fixed to the valve main body 1A at a position where the valve chamber 1C and the secondary joint pipe 12 communicate with each other, and a valve port 14 having a circular cross section is formed through the valve seat member 13. ing. The support member 1B is welded and fixed to the valve main body 1A by a fixing portion 15 made of metal. The support member 1B is a molded resin product, and includes a cylindrical valve guide portion (guide portion) 16 provided on the valve seat member 13 side and a female screw formed on the inner peripheral surface provided on the drive portion 4 side. and a female threaded portion 17 . A case 18 is hermetically fixed to the upper end of the valve body 1A by welding or the like.

The valve body 2 includes a valve portion 2A having a needle portion 21 that is seated and separated from the valve seat member 13, a cylindrical valve holder 2B that holds a base end portion 22 of the valve portion 2A, a valve A spring bearing 2C built in the holder 2B and abutting on an enlarged diameter portion 32c at the tip of a screw shaft 32, which will be described later, and a compression spring interposed in a compressed state between the base end portion 22 of the valve portion 2A and the spring bearing 2C. 2D, and a thrust washer 2E interposed between the enlarged diameter portion 32c of the screw shaft 32 and the valve holder 2B. The valve portion 2A, the valve holder 2B, the spring bearing 2C, the compression spring 2D and the thrust washer 2E are arranged coaxially around the axis L, and the valve body 2 is advanced and retracted along the axis L direction by the driving portion 3. driven. The valve portion 2A has a projecting portion 23 projecting upward (toward the driving portion 3) from the base end portion 22, and the projecting portion 23 is inserted into the compression spring 2D. An insertion hole 24 through which the screw shaft 32 is inserted is formed in the upper wall portion of the valve holder 2B, and the enlarged diameter portion 32c of the screw shaft 32 is engaged with the upper wall portion of the valve holder 2B via the thrust washer 2E. ing. The thrust washer 2E can contact the enlarged diameter portion 32c of the screw shaft 32 and the upper wall portion of the valve holder 2B. is less likely to be transmitted to the valve holder 2B.

The drive unit 3 includes a stepping motor 3A as an electric motor, a screw feed mechanism 3B that advances and retracts the valve body 2 by rotation of the stepping motor 3A, and a stopper mechanism 3C that restricts rotation of the stepping motor 3A. The stepping motor 3A includes a magnet rotor 31 whose outer periphery is magnetized with multiple poles, a stator coil (not shown) disposed on the outer periphery of the case 18, and a screw shaft 32 as a drive shaft fixed to the magnet rotor 31. , is equipped with The screw shaft 32 is fixed to the magnet rotor 31 via a fixing member 32a, extends along the axis L, and has its upper end inserted into the guide 33 of the stopper mechanism 3C. A male threaded portion 32b is formed integrally with the intermediate portion of the screw shaft 32, and this male threaded portion 32b is screwed into the female threaded portion 17 of the support member 1B, thereby constituting the screw feed mechanism 3B. When the magnet rotor 31 rotates, the male threaded portion 32a of the screw shaft 32 is guided by the female threaded portion 17, so that the magnet rotor 31 and the screw shaft 32 move forward and backward in the direction of the axis L, and accordingly the valve body 2 also moves along the axis. Ascend or descend along L. An enlarged diameter portion 32c that engages with the valve holder 2B of the valve body 2 is formed at the tip of the screw shaft 32 .

The stopper mechanism 3C includes a cylindrical guide 33 suspended from the ceiling of the case 18, a guide wire body 34 fixed to the outer circumference of the guide 33, and a movable guide wire body 34 that is guided by the guide wire body 34 to rotate and move up and down. and a slider 35 . The movable slider 35 is provided with a pawl portion 35a protruding radially outward. It has become. The guide 33 is formed with an upper end stopper 33 a that defines the uppermost position of the magnet rotor 31 , and the guide wire body 34 is formed with a lower end stopper 34 a that defines the lowermost position of the magnet rotor 31 . When the claw portion 35a of the movable slider 35 comes into contact with the upper end stopper 33a and the lower end stopper 34a, the rotation of the movable slider 35 is stopped. is also stopped.

Next, based on FIG. 2, the structure of the valve body 2 and the screw shaft 32 will be described in detail. In the electrically operated valve 10A of this embodiment, the spring bearing 2C of the valve body 2 and the screw shaft 32 are connected via an inclination restricting means 4A that regulates the inclination of the spring bearing 2C with respect to the axis L direction. Further, in the electric valve 10A, the valve holder 2B is rotatably engaged with the enlarged diameter portion 32c of the screw shaft 32, and is also fitted with the base end portion 22 of the valve portion 2A and fixed to each other. The spring bearing 2C abuts on the enlarged diameter portion 32c of the screw shaft 32 and is provided apart from the base end portion 22 of the valve portion 2A. The tilt restricting means 4A includes a hole 25 formed in the spring bearing 2C and extending in the direction of the axis L, a shaft portion 36 extending in the direction of the axis L from the enlarged diameter portion 32c of the screw shaft 32 and inserted into the hole 25, is configured with The inner diameter D of the hole portion 25 and the insertion length L of the shaft portion 36 into the hole portion 25 are such that the insertion length L is equal to or greater than the inner diameter D (L>D). The insertion length L is preferably two times or more the inner diameter D (L>2D), and more preferably three times or more the inner diameter D (L>3D). The inner peripheral surface of the hole portion 25 and the outer peripheral surface of the shaft portion 36 are in sliding contact with each other, and by restricting mutual movement in the direction intersecting the direction of the axis L, the inclination of the spring bearing 2C is restricted. ing.

According to the present embodiment described above, the spring bearing 2C of the valve body 2 and the enlarged diameter portion 32c of the screw shaft 32 are connected via the inclination regulating means 4A for regulating the inclination of the spring bearing 2C. When the valve portion 2A is biased via the spring bearing 2C and the compression spring 2D as the shaft 32 moves (lowers) in the valve closing direction, the eccentricity and inclination of the valve portion 2A with respect to the valve port 14 can be suppressed. can. Therefore, by seating the needle portion 21 of the valve portion 2A with respect to the valve port 14 without eccentricity or inclination, valve leakage is suppressed when the valve is closed, and the contact portion between the valve portion 2A and the valve port 14 is suppressed. local deformation and wear can be suppressed to improve durability.

The inclination restricting means 4A includes a hole portion 25 formed in the spring bearing 2C and extending in the direction of the axis L, and a shaft portion 36 extending in the direction of the axis L from the enlarged diameter portion 32c of the screw shaft 32 and inserted into the hole portion 25. and , the inclination restricting means 4A can be configured with a relatively simple structure without increasing the number of constituent members of the valve body 2 . Further, in the inclination restricting means 4A, the insertion length L of the shaft portion 36 is equal to or greater than the inner diameter D of the hole 25 (L>D), so that the inclination of the spring bearing 2C can be more reliably restricted.

Next, a motor operated valve 10B according to a second embodiment of the present invention will be described with reference to FIG. A motor-operated valve 10B of the present embodiment includes a valve housing 1, a valve body 2, and an actuator 3, like the motor-operated valve 10A of the first embodiment. On the other hand, the motor-operated valve 10B differs from the motor-operated valve 10A in the partial configuration of the valve body 2 . The differences will be described in detail below.

In the valve body 2 of the electric valve 10B of the present embodiment, the valve holder 2B is rotatably engaged with the enlarged diameter portion 32c of the screw shaft 32 and fitted with the base end portion 22 of the valve portion 2A. fixed to each other. The spring bearing 2C abuts on the base end portion 22 of the valve portion 2A and is provided apart from the projecting portion 32d projecting from the enlarged diameter portion 32c of the screw shaft 32. As shown in FIG. The projecting portion 32d is provided on the enlarged diameter portion 32c from which the shaft portion 36 of the first embodiment is omitted. positioned. The base end portion 22 of the valve portion 2A and the spring bearing 2C are connected via an inclination restricting means 4B that regulates the inclination of the spring bearing 2C with respect to the axis L direction.

The inclination restricting means 4B includes a hole portion 26 formed in the spring bearing 2C and extending in the direction of the axis L, a shaft portion 27 extending in the direction of the axis L from the base end portion 22 of the valve portion 2A and inserted into the hole portion 26, is configured with The inner diameter D of the hole portion 26 and the insertion length L of the shaft portion 27 into the hole portion 26 are such that the insertion length L is equal to or greater than the inner diameter D (L>D). The insertion length L is preferably two times or more the inner diameter D (L>2D), and more preferably three times or more the inner diameter D (L>3D). Since the inner peripheral surface of the hole portion 26 and the outer peripheral surface of the shaft portion 27 are in sliding contact with each other and their mutual movement in the direction intersecting the direction of the axis L is restricted, the inclination of the spring bearing 2C is restricted. ing.

According to the present embodiment described above, the base end portion 22 of the valve portion 2A of the valve body 2 and the spring support 2C are connected via the inclination restricting means 4B for restricting the inclination of the spring support 2C. When the valve portion 2A is urged via the compression spring 2D and the spring bearing 2C as the shaft 32 moves (lowers) in the valve closing direction, eccentricity and inclination of the valve portion 2A with respect to the valve port 14 can be suppressed. can. Therefore, by seating the needle portion 21 of the valve portion 2A with respect to the valve port 14 without eccentricity or inclination, valve leakage is suppressed when the valve is closed, and the contact portion between the valve portion 2A and the valve port 14 is suppressed. local deformation and wear can be suppressed to improve durability.

The inclination restricting means 4B includes a hole portion 26 formed in the spring bearing 2C and extending in the direction of the axis L, and a shaft portion 27 extending in the direction of the axis L from the base end portion 22 of the valve portion 2A and inserted into the hole portion 26. and , the inclination restricting means 4B can be configured with a relatively simple structure without increasing the number of constituent members of the valve body 2 . Further, in the inclination restricting means 4B, the insertion length L of the shaft portion 27 is equal to or greater than the inner diameter D of the hole 26 (L>D), so that the inclination of the spring bearing 2C can be more reliably restricted.

Next, a motor operated valve 10C according to a third embodiment of the present invention will be described with reference to FIG. A motor-operated valve 10C of the present embodiment includes a valve housing 1, a valve body 2, and an actuator 3, like the motor-operated valves 10A and 10B of the first and second embodiments. On the other hand, the motor-operated valve 10C differs from the motor-operated valves 10A and 10B in the partial configuration of the valve body 2 . The differences will be described in detail below.

In the valve body 2 of the electrically operated valve 10C of this embodiment, the valve holder 2B is fixed integrally with the distal end portion 32e of the screw shaft 32, and the bearing 28 is fixed to the opening on the distal end side (valve seat member 13 side). ing. The base end portion 22 of the valve portion 2A is rotatably engaged with a bearing 28, and the valve portion 2A is rotatably supported around the axis L. As shown in FIG. 2 C of spring bearings contact|abut on the base end part 22 of 2 A of valve parts, and are separated from the front-end|tip part 32e of the screw shaft 32, and are provided. In this valve element 2, the valve holder 2B is fixed to the distal end portion 32e of the screw shaft 32, so the valve holder 2B also rotates as the screw shaft 32 rotates. On the other hand, since the valve portion 2A is rotatably supported by the bearing 28 with respect to the valve holder 2B, frictional force in the circumferential direction does not act on the valve seat member 13 when seated. .

The base end portion 22 of the valve portion 2A and the spring bearing 2C are connected via an inclination restricting means 4C that regulates the inclination of the spring bearing 2C with respect to the axis L direction. The tilt restricting means 4C includes a hole portion 26 formed in the spring bearing 2C and extending in the direction of the axis L, a shaft portion 27 extending in the direction of the axis L from the base end portion 22 of the valve portion 2A and inserted into the hole portion 26, is configured with The inner diameter D of the hole portion 26 and the insertion length L of the shaft portion 27 into the hole portion 26 are such that the insertion length L is equal to or greater than the inner diameter D (L>D). The insertion length L is preferably two times or more the inner diameter D (L>2D), and more preferably three times or more the inner diameter D (L>3D). Since the inner peripheral surface of the hole portion 26 and the outer peripheral surface of the shaft portion 27 are in sliding contact with each other and their mutual movement in the direction intersecting the direction of the axis L is restricted, the inclination of the spring bearing 2C is restricted. ing.

According to the present embodiment described above, the base end portion 22 of the valve portion 2A of the valve body 2 and the spring bearing 2C are connected via the inclination restricting means 4C that regulates the inclination of the spring bearing 2C. When the valve portion 2A is urged via the compression spring 2D and the spring bearing 2C as the shaft 32 moves (lowers) in the valve closing direction, eccentricity and inclination of the valve portion 2A with respect to the valve port 14 can be suppressed. can. Therefore, by seating the needle portion 21 of the valve portion 2A with respect to the valve port 14 without eccentricity or inclination, valve leakage is suppressed when the valve is closed, and the contact portion between the valve portion 2A and the valve port 14 is suppressed. local deformation and wear can be suppressed to improve durability.

The inclination restricting means 4C includes a hole portion 26 formed in the spring bearing 2C and extending in the direction of the axis L, and a shaft portion 27 extending in the direction of the axis L from the base end portion 22 of the valve portion 2A and inserted into the hole portion 26. and , the inclination restricting means 4C can be configured with a relatively simple structure without increasing the number of constituent members of the valve body 2 . Further, in the inclination restricting means 4C, the insertion length L of the shaft portion 27 is equal to or greater than the inner diameter D of the hole 26 (L>D), so that the inclination of the spring bearing 2C can be more reliably restricted.

Next, a motor operated valve 10D according to a fourth embodiment of the present invention will be described with reference to FIG. A motor-operated valve 10D of this embodiment includes a valve housing 1, a valve body 2, and a driving portion 3, like the motor-operated valves 10A to 10C of the first to third embodiments. On the other hand, the motor-operated valve 10D differs from the motor-operated valves 10A to 10C in the partial configurations of the valve housing 1 and the valve body 2. As shown in FIG. The differences will be described in detail below.

The valve housing 1 of the electric valve 10D of this embodiment includes a first valve body 1D having a valve chamber 1C therein, a tubular second valve body 1E fixed to the valve body 1D, and the first valve body 1D. and a guide member 1F that is fixed inside and guides the valve portion 2A. The first valve main body 1D is formed by cutting a metal material such as stainless steel, and an opening that becomes the valve port 14 is formed integrally therewith. The second valve body 1E is fixed to the upper portion of the first valve body 1D by caulking and brazing, and the support member 1B and the case 18 are welded to the upper portion of the second valve body 1E. The guide member 1F is fitted and fixed to the first valve main body 1D, and is configured to guide the intermediate portion of the valve portion 2A along the axis L direction by means of a through hole passing through the center thereof.

In the valve body 2 of the electric valve 10D, the valve holder 2B is rotatably engaged with the enlarged diameter portion 32c of the screw shaft 32, and is rotatably engaged with the base end portion 22 of the valve portion 2A by the bearing 28. are combined. The spring bearing 2C abuts on the enlarged diameter portion 32c of the screw shaft 32 and is provided apart from the protrusion 23 of the base end portion 22 of the valve portion 2A. The enlarged diameter portion 32c of the screw shaft 32 and the spring bearing 2C are connected via an inclination restricting means 4D that regulates the inclination of the spring bearing 2C with respect to the axis L direction. The tilt regulating means 4D, like the tilt regulating means 4A of the first embodiment, includes the hole portion 25 of the spring bearing 2C and the shaft portion 36 of the valve portion 2A. The inner diameter D of the hole portion 25 and the insertion length L of the shaft portion 36 into the hole portion 25 are such that the insertion length L is equal to or greater than the inner diameter D (L>D). The insertion length L is preferably two times or more the inner diameter D (L>2D), and more preferably three times or more the inner diameter D (L>3D). The inner peripheral surface of the hole portion 25 and the outer peripheral surface of the shaft portion 36 are in sliding contact with each other, and by restricting mutual movement in the direction intersecting the direction of the axis L, the inclination of the spring bearing 2C is restricted. ing.

According to the present embodiment described above, the enlarged diameter portion 32c of the screw shaft 32 and the spring bearing 2C are connected via the inclination restricting means 4D that regulates the inclination of the spring bearing 2C. When the valve portion 2A is biased via the spring bearing 2C and the compression spring 2D as it moves (lowers) in the closing direction, eccentricity and inclination of the valve portion 2A with respect to the valve port 14 can be suppressed. Therefore, by seating the needle portion 21 of the valve portion 2A with respect to the valve port 14 without eccentricity or inclination, valve leakage is suppressed when the valve is closed, and the contact portion between the valve portion 2A and the valve port 14 is suppressed. local deformation and wear can be suppressed to improve durability.

Next, a motor operated valve 10E according to a fifth embodiment of the present invention will be described with reference to FIG. A motor-operated valve 10E of this embodiment includes a valve housing 1, a valve body 2, and a driving portion 3, like the motor-operated valves 10A to 10D of the first to fourth embodiments. On the other hand, the motor-operated valve 10E differs from the motor-operated valves 10A to 10C in the partial construction of the valve housing 1 and the valve body 2, and the partial structure of the valve body 2 differs from the motor-operated valve 10D. The differences will be described in detail below.

The valve housing 1 of the motor-operated valve 10E of this embodiment has a first valve body 1D, a second valve body 1E, and a guide member 1F, similarly to the motor-operated valve 10D. In the valve body 2 of the electric valve 10E, the valve holder 2B is rotatably engaged with the enlarged diameter portion 32c of the screw shaft 32, and is rotatably engaged with the base end portion 22 of the valve portion 2A by the bearing 28. are combined. The spring bearing 2C abuts on the enlarged diameter portion 32c of the screw shaft 32 and is provided apart from the protrusion 23 of the base end portion 22 of the valve portion 2A. The enlarged diameter portion 32c of the screw shaft 32, the base end portion 22 of the valve portion 2A, and the spring bearing 2C are connected via an inclination restricting means 4E that regulates the inclination of the spring bearing 2C with respect to the axis L direction.

The tilt regulating means 4E extends in the direction of the axis L from the hole 25 penetrating vertically through the spring bearing 2C, the shaft portion 27 of the valve portion 2A, and the enlarged diameter portion 32c of the screw shaft 32 and is inserted into the hole 25. and a shaft portion 36 . The inner diameter D of the hole portion 25 and the insertion length L of the shaft portions 27 and 36 into the hole portion 25 are such that the insertion length L is equal to or greater than the inner diameter D (L>D). The insertion length L is preferably two times or more the inner diameter D (L>2D), and more preferably three times or more the inner diameter D (L>3D). The inner peripheral surface of the hole portion 25 and the outer peripheral surfaces of the shaft portions 27 and 36 are in sliding contact with each other, and by restricting mutual movement in the direction intersecting the direction of the axis L, the inclination of the spring bearing 2C is reduced. Regulated.

According to the present embodiment described above, the enlarged diameter portion 32c of the screw shaft 32, the base end portion 22 of the valve portion 2A, and the spring bearing 2C are connected via the inclination restricting means 4E that regulates the inclination of the spring bearing 2C. Therefore, when the valve portion 2A is biased via the spring bearing 2C and the compression spring 2D as the screw shaft 32 moves (lowers) in the valve closing direction, the eccentricity and inclination of the valve portion 2A with respect to the valve port 14 can be suppressed. Therefore, by seating the needle portion 21 of the valve portion 2A with respect to the valve port 14 without eccentricity or inclination, valve leakage is suppressed when the valve is closed, and the contact portion between the valve portion 2A and the valve port 14 is suppressed. local deformation and wear can be suppressed to improve durability.

Next, the refrigerating cycle system of the present invention will be explained based on FIG. FIG. 7 is a diagram showing the refrigeration cycle system of the embodiment. In the figure, reference numeral 100 denotes an expansion valve using the motor-operated valves 10A to 10E of each embodiment, 200 denotes an outdoor heat exchanger mounted on the outdoor unit, 300 denotes an indoor heat exchanger mounted on the indoor unit, 400 is a channel switching valve forming a four-way valve, and 500 is a compressor. The electric valve 100, the outdoor heat exchanger 200, the indoor heat exchanger 300, the flow path switching valve 400, and the compressor 500 are connected by conduits as shown in the figure to form a heat pump refrigeration cycle. Note that the accumulator, pressure sensor, temperature sensor, etc. are omitted from the drawing.

The flow path of the refrigeration cycle is switched by a flow path switching valve 400 between two flow paths for cooling operation and for heating operation. During cooling operation, the refrigerant compressed by the compressor 500 flows from the flow path switching valve 400 into the outdoor heat exchanger 200, and the outdoor heat exchanger 200 functions as a condenser, as indicated by solid arrows in the drawing. The liquid refrigerant discharged from the outdoor heat exchanger 200 is introduced into the indoor heat exchanger 300 through the expansion valve 100, and the indoor heat exchanger 300 functions as an evaporator.

On the other hand, during heating operation, as indicated by the dashed arrow in the figure, the refrigerant compressed by the compressor 500 flows from the flow path switching valve 400 to the indoor heat exchanger 300, the expansion valve 100, the outdoor heat exchanger 200, and the flow paths. The switching valve 400 and the compressor 500 are circulated in order, the indoor heat exchanger 300 functions as a condenser, and the outdoor heat exchanger 200 functions as an evaporator. The expansion valve 100 decompresses and expands the liquid refrigerant flowing from the outdoor heat exchanger 200 during cooling operation or the liquid refrigerant flowing from the indoor heat exchanger 300 during heating operation, and further controls the flow rate of the refrigerant.

It should be noted that the present invention is not limited to the above-described embodiments, but includes other configurations and the like that can achieve the object of the present invention, and the following modifications and the like are also included in the present invention. For example, in the above embodiment, the motor operated valves 10A to 10E used in air conditioners such as domestic air conditioners were exemplified, but the motor operated valves of the present invention are not limited to domestic air conditioners and may be commercial air conditioners. However, it is applicable not only to air conditioners but also to various types of refrigerators. Further, in the above-described embodiment, it is described that the refrigerant flows in from the primary joint pipe 11 and flows out from the secondary joint pipe 12. However, it is not limited to this one-way flow. It can also be applied when the refrigerant flows in from the secondary joint pipe 12 and flows out from the primary joint pipe 11 .

In the above-described embodiment, the drive section 3 is configured to include the stepping motor 3A, the screw feed mechanism 3B, and the stopper mechanism 3C. Any device may be used as long as it can drive the valve body along the axial direction. In the above-described embodiment, the screw feed mechanism 3B is configured by screwing the male threaded portion 32b of the screw shaft 32 of the drive portion 3 into the female threaded portion 17 of the support member 1B. A female thread may be formed on the side of the support member 1B, and a male thread may be formed on the side of the support member 1B. Further, the drive shaft is not limited to the configuration in which the screw shaft 32 is driven to rotate by the stepping motor 3A and is driven forward and backward by the screw feed mechanism 3B as in the case of the screw shaft 32 of the above-described embodiment. It may be driven forward and backward without accompanying.

In the above-described embodiment, the tip of the valve portion 2A of the valve element 2 is the tapered needle portion 21, and the needle portion 21 is inserted into the valve port 14 to be seated. Alternatively, the tip of the valve portion 2A may be formed in a flat plate shape and seated so as to cover the valve port. In the above-described embodiment, the valve portion 2A is formed separately from the valve holder 2B and fixed, or the valve portion 2A is rotatably supported by the valve holder 2B by the bearing 28. Not limited to this, the valve portion 2A and the valve holder 2B may be integrally formed. Further, in the first, fourth and fifth embodiments, the compression spring 2D directly abuts the base end portion 22 of the valve portion 2A. may be interposed with a friction reducing member similar to the thrust washer 2E. In the above embodiment, the spring bearing 2C is formed with the holes 25 and 26 extending in the direction of the axis L, but these holes may pass through the spring bearing 2C in the direction of the axis L. , does not have to penetrate.

Further, supplementary explanations of the first to fifth embodiments will be given below. As in the first, fourth, and fifth embodiments, the spring bearing 2C and the tip portion (enlarged diameter portion 32c) of the drive shaft (screw shaft 32) are in contact with each other and rotate and slide relative to each other. At least between the tip of the drive shaft and the spring bearing (on the side of the rotation sliding surface thereof), tilt regulating means (tilt regulating means 4A, 4D, 4E) are provided across the rotational sliding surface of the spring bearing. there is Further, in the configuration in which the spring support 2C and the proximal end portion 22 of the valve portion 2A are in contact with each other and rotate and slide relative to each other as in the second and third embodiments, at least the valve portion has a base end portion. Between the end portion and the spring bearing (on the side of the rotating sliding surface), an inclination restricting means (tilting restricting means 4B, 4C) is provided across the rotating sliding surface of the spring bearing. In this way, the shaft is extended from the distal end of the drive shaft or the proximal end of the valve portion that abuts against the rotary sliding surface of the spring bearing, and the shaft is inserted into the hole of the spring bearing. Therefore, the following additional effects can also be achieved. That is, the center of the drive shaft and the center of the spring bearing are not displaced in the direction intersecting with the axis L, and the drive shaft and the spring bearing are not inclined. The end face of the drive shaft does not tilt against each other and rotates and slides with a constant surface pressure, so that it is possible to improve the durability of the spring receiving portion and the operation durability of the motor-operated valve.

Although the embodiments of the present invention have been described in detail above with reference to the drawings, the specific configuration is not limited to these embodiments, and design modifications and the like are made within the scope of the present invention. is included in the present invention.

2 valve body 2A valve portion 2B valve holder 2C spring bearing 2D compression spring 3 drive portion 4A, 4B, 4C, 4D, 4E tilt control means 10A, 10B, 10C, 10D, 10E electric valve 14 valve port 16 valve guide portion (guide part)
22 base end 32 screw shaft (drive shaft)
32c Expanded diameter portion (tip)
25, 26 holes 27, 36 shaft

Claims (7)

A motor-operated valve comprising a valve body that opens and closes a valve port, a drive section that drives the valve body along the axial direction, and a guide section that guides the valve body in the axial direction,
The drive unit
Having a drive shaft that moves back and forth in the axial direction,
The valve body
a valve portion that contacts and separates from the valve port as the drive shaft advances and retreats;
a hollow valve holder provided over the distal end portion of the drive shaft and the proximal end portion of the valve portion and guided by the guide portion;
a spring receiver that is incorporated in the valve holder and abuts against one of the distal end portion of the drive shaft and the proximal end portion of the valve portion and is provided apart from the other;
a compression spring interposed in a compressed state between the spring bearing and the other of the distal end portion of the drive shaft and the proximal end portion of the valve portion,
At least one of the distal end portion of the drive shaft and the proximal end portion of the valve portion and the spring bearing are connected via an inclination restricting means for restricting an inclination of the spring bearing with respect to the axial direction,
The spring bearing is provided with a rotary sliding surface that rotates and slides on either one of the distal end portion of the drive shaft and the proximal end portion of the valve portion,
The tilt regulating means extends in the axial direction from at least one of a hole opening in the rotation sliding surface of the spring bearing and extending in the axial direction, a distal end portion of the drive shaft, and a proximal end portion of the valve portion. a shaft that extends and is inserted into the hole across the rotation sliding surface, wherein the length of insertion of the shaft into the hole is equal to or greater than the inner diameter of the hole. motorized valve. the valve holder is rotatably engaged with the distal end portion of the drive shaft and fixed to the proximal end portion of the valve portion;
The spring bearing abuts the distal end portion of the drive shaft with the rotational sliding surface and is provided apart from the proximal end portion of the valve portion,
The inclination restricting means includes the hole formed in the spring bearing and the shaft formed at the tip of the drive shaft,
The inner peripheral surface of the hole and the outer peripheral surface of the shaft are in sliding contact with each other, and the inclination of the spring bearing is restricted by restricting mutual movement in a direction crossing the axial direction. The motor operated valve according to claim 1, characterized by: the valve holder is rotatably engaged with the distal end portion of the drive shaft and fixed to the proximal end portion of the valve portion;
The spring bearing is spaced apart from the distal end of the drive shaft and is provided in contact with the proximal end of the valve portion at the rotational sliding surface,
The inclination restricting means includes the hole formed in the spring bearing and the shaft formed at the base end of the valve,
The inner peripheral surface of the hole and the outer peripheral surface of the shaft are in sliding contact with each other, and the inclination of the spring bearing is restricted by restricting mutual movement in a direction crossing the axial direction. The motor operated valve according to claim 1, characterized by: The valve holder is fixed to the distal end portion of the drive shaft and rotatably engaged with the proximal end portion of the valve portion,
The spring bearing is spaced apart from the distal end of the drive shaft and is provided in contact with the proximal end of the valve portion at the rotational sliding surface,
The inclination restricting means includes the hole formed in the spring bearing and the shaft formed at the base end of the valve,
The inner peripheral surface of the hole and the outer peripheral surface of the shaft are in sliding contact with each other, and the inclination of the spring bearing is restricted by restricting mutual movement in a direction crossing the axial direction. The motor operated valve according to claim 1, characterized by: the valve holder is rotatably engaged with a distal end portion of the drive shaft and rotatably engaged with a proximal end portion of the valve portion;
The spring bearing abuts on the distal end portion of the drive shaft with the rotational sliding surface and is provided apart from the proximal end portion of the valve portion,
The inclination restricting means includes the hole formed in the spring bearing and the shaft formed at the tip of the drive shaft,
The inner peripheral surface of the hole and the outer peripheral surface of the shaft are in sliding contact with each other, and the inclination of the spring bearing is restricted by restricting mutual movement in a direction crossing the axial direction. The motor operated valve according to claim 1, characterized by: the valve holder is rotatably engaged with a distal end portion of the drive shaft and rotatably engaged with a proximal end portion of the valve portion;
The spring bearing abuts against the distal end portion of the drive shaft with the rotational sliding surface and is provided apart from the proximal end portion of the valve portion,
The tilt regulating means includes the hole formed in the spring bearing, a first shaft portion formed at the distal end portion of the drive shaft and constituting the shaft portion, and a base end portion of the valve portion extending from the valve portion. a second shaft extending in the axial direction and inserted into the hole;
The inner peripheral surface of the hole portion and the outer peripheral surfaces of the first and second shaft portions are in sliding contact with each other, and their mutual movement in the direction intersecting with the axial direction is restricted, so that the inclination of the spring bearing is reduced. 2. The motor-operated valve according to claim 1, wherein is regulated. A refrigeration cycle system including a compressor, a condenser, an expansion valve, and an evaporator, wherein the motor-operated valve according to any one of claims 1 to 6 is used as the expansion valve. A refrigeration cycle system characterized by:

Images