CN113294527B - Electric valve and refrigeration cycle system - Google Patents
Electric valve and refrigeration cycle system Download PDFInfo
- Publication number
- CN113294527B CN113294527B CN202110071552.1A CN202110071552A CN113294527B CN 113294527 B CN113294527 B CN 113294527B CN 202110071552 A CN202110071552 A CN 202110071552A CN 113294527 B CN113294527 B CN 113294527B
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- Prior art keywords
- valve
- rotor shaft
- shaft
- guide hole
- guided portion
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/02—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with screw-spindle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
- F16K31/04—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Electrically Driven Valve-Operating Means (AREA)
Abstract
The invention provides an electric valve and a refrigeration cycle system. In an electric valve in which a screw feed mechanism converts linear motion in the axial direction of a rotor shaft and the opening degree of a valve port is controlled by a valve member, vibration and inclination of the rotor shaft are suppressed, and the operability of the electric valve is stabilized. A screw feeding mechanism is composed of a female screw part (21 a) formed on a support member (2) on the valve housing (1) side and a male screw part (3 a) formed on a rotor shaft (3) of a stepping motor (6). The screw feed mechanism converts the rotational motion of a magnetic rotor (62) of the stepping motor into linear motion in the direction of the axis X of the rotor shaft. The opening degree of the valve port (11) is controlled by a needle valve (5) connected to the rotor shaft. A sleeve member (71) is provided between a constricted portion (31) (a part of the rotor shaft) that moves integrally with the rotor shaft in the direction of the axis X and a shaft guide hole (21 b) that holds the rotor shaft on the axis X.
Description
Technical Field
The present invention relates to an electrically operated valve used in a refrigeration cycle system and the like, and a refrigeration cycle system.
Background
In the past, as an electrically operated valve provided in a refrigeration cycle of an air conditioner, there are, for example, electrically operated valves disclosed in japanese patent application laid-open publication 2016-23711 (patent document 1) and japanese patent application laid-open publication 2017-25974 (patent document 2). In the above-described electric valve, a male screw portion is formed on a rotor shaft side of an electric motor, a female screw portion through which the rotor shaft passes is disposed, and a valve member is provided at a lower end of the rotor shaft. The rotation of the rotor of the electric motor is converted into linear motion in the axial direction of the rotor shaft by the screw feed mechanism of the female screw portion and the male screw portion, and the valve member is moved to control the opening degree of the valve port. In the structure of patent document 1, a stopper mechanism for restricting the rotation range of the magnetic rotor of the electric motor, that is, the lower end position and the upper end position, is provided on the outer periphery of the support member on which the female screw portion is formed. In the structure of patent document 2, the same stopper mechanism is provided in the ceiling of the hermetic case (on the end side of the rotor shaft).
Prior art literature
Patent literature
Patent document 1: japanese patent laid-open publication 2016-23711
Patent document 2: japanese patent application laid-open No. 2017-25974
Disclosure of Invention
Problems to be solved by the invention
As described above, in an electric valve using a screw feed mechanism composed of a female screw portion and a male screw portion, a clearance is required between the female screw portion and the male screw portion in consideration of operability of the screw feed mechanism. Therefore, when the rotor shaft vibrates or tilts during rotation of the magnetic rotor, the rotor shaft or a portion connected to the rotor shaft may be biased to contact the sliding portion, and operability of the electric valve may be deteriorated.
The invention aims to restrain vibration of a rotor shaft and stabilize the operation of an electric valve in an electric valve which converts linear motion of the rotor shaft in the axial direction by a screw feeding mechanism and controls the opening degree of a valve port by a valve component and a refrigeration cycle system with the electric valve.
Means for solving the problems
An electric valve according to the present invention includes a female screw portion formed in a support member on a valve body side and a male screw portion formed in a rotor shaft of an electric motor and penetrating a center of the female screw portion, and a screw feed mechanism for converting a rotational motion of a magnetic rotor of the electric motor into a linear motion in an axial direction of the rotor shaft by the female screw portion and the male screw portion, and controlling an opening degree of a valve port by a valve member coupled to the rotor shaft, the electric valve including: a guided portion that moves integrally with the rotor shaft in the axial direction; an on-axis guide hole that forms a cylindrical cavity through which the guided portion is inserted and which holds the guided portion on the axis; and a sleeve member provided between the guided portion and the shaft-mounted guide hole and lightly pressed into the guided portion and the shaft-mounted guide hole.
In this case, it is preferable that the above-mentioned shaft guide hole is a shaft guide hole formed in the above-mentioned support member coaxially with the above-mentioned female screw portion, and the above-mentioned guided portion is a constricted portion formed coaxially with the above-mentioned male screw portion of the above-mentioned rotor shaft.
Further, it is preferable that the shaft guide hole is a slide hole formed in the support member coaxially with the female screw portion, and the guided portion is a valve frame formed integrally with the rotor shaft and disposed in the slide hole so as to hold the valve member.
Further, it is preferable that the motor-operated valve has a stopper mechanism for restricting a rotation range of the magnetic rotor at an end portion of the rotor shaft opposite to the valve member, a guide tube for inserting the end portion of the rotor shaft is provided at a center of the stopper mechanism, the shaft guide hole is a hole in an inner periphery of the guide tube, and the guided portion is the end portion of the rotor shaft.
Further, it is preferable that the sleeve is made of an elastic material, and a load is applied to contact surfaces which are in contact with an inner periphery of the shaft guide hole and an outer periphery of the guided portion in opposite directions in a radial direction.
The refrigeration cycle system of the present invention includes a compressor, a condenser, an expansion valve, and an evaporator, and is characterized in that the electric valve is used as the expansion valve.
The effects of the invention are as follows.
According to the electric valve and the refrigeration cycle of the present invention, since the sleeve member that is lightly press-fitted into the guided portion and the on-axis guide hole is provided between the guided portion that moves integrally with the rotor shaft in the axial direction and the on-axis guide hole that holds the guided portion on the axis, a load is applied from the sleeve member toward the radially inner side to the contact surface that contacts the outer periphery of the guided portion, and a load is applied toward the radially outer side to the contact surface that contacts the inner periphery of the on-axis guide hole, that is, a load is applied to the outer periphery of the guided portion and the inner periphery of the on-axis guide hole in directions opposite to each other in the radial direction across the sleeve member. This suppresses vibration and inclination of the rotor shaft due to the clearance in the screw feed mechanism, and the operability of the electric valve is stable.
Drawings
Fig. 1 is a longitudinal sectional view of an electrically operated valve according to a first embodiment of the present invention.
Fig. 2 is an enlarged longitudinal sectional view and a plan sectional view of a main portion in the vicinity of a sleeve member in the electrically operated valve according to the first embodiment of the present invention.
Fig. 3 is a view for explaining the action of the sleeve member in the motor-operated valve according to the first embodiment of the present invention.
Fig. 4 is a longitudinal sectional view of an electrically operated valve according to a second embodiment of the present invention.
Fig. 5 is a longitudinal sectional view of an electrically operated valve according to a third embodiment of the present invention.
Fig. 6 is a longitudinal sectional view of an electrically operated valve according to a fourth embodiment of the present invention.
Fig. 7 is a longitudinal sectional view of an electrically operated valve according to a fifth embodiment of the present invention.
Fig. 8 is a longitudinal sectional view of an electrically operated valve according to a sixth embodiment of the present invention.
Fig. 9 is a diagram showing a refrigeration cycle according to an embodiment of the present invention.
In the figure:
1-valve housing, 1A-valve chamber, 11-valve port, 12-straight portion, 13-valve guide member, 13 a-valve guide member, 14-housing, 111-primary joint pipe, 112-secondary joint pipe, X-axis, 2-support member, 21-bracket portion, 22-flange portion, 21A-female screw portion, 21 b-shaft guide member, 21 c-slide hole, 211-guide male screw, 212-lower end retainer, 213-upper end retainer, 214-follower slider, 3-rotor shaft, 3 a-male screw portion, 4-valve frame, 1-needle valve, 41-cylinder portion, 42-boss portion, 43-spring seat, 44-compression coil spring, 45-washer, 51-needle portion, 52-rod portion, 53-flange portion, 61-closed housing, 62-magnetic rotor, 63-stator coil, 2-step motor, 71-sleeve member, 72-sleeve member, 73-sleeve member, 74-sleeve member, 75-sleeve member, 76-sleeve member, 100-electric motor-chamber 200-heat exchanger, 300-heat exchanger, and indoor heat exchanger.
Detailed Description
Next, an embodiment of the electrically operated valve according to the present invention will be described with reference to the drawings. Fig. 1 is a longitudinal sectional view of an electrically operated valve according to a first embodiment, fig. 2 is an enlarged longitudinal sectional view and a plan sectional view of a main portion in the vicinity of a sleeve member in the electrically operated valve according to the first embodiment, and fig. 2 (B) is A-A sectional view of fig. 2 (a). Fig. 3 is a diagram illustrating the operation of the sleeve member in the motor-operated valve according to the first embodiment. The concept of "up and down" in the following description corresponds to up and down in the drawing of fig. 1.
The motor-operated valve 100 has a valve housing 1 as a "valve body" formed of a metal member such as stainless steel or brass, a valve chamber 1A and a cylindrical valve port 11 opening to the valve chamber 1A centering on an axis X are formed in the valve housing 1, and a straight portion 12 is formed below the valve port 11. Further, a primary joint pipe 111 communicating with the valve chamber 1A from the side surface side is attached to the valve housing 1, and a secondary joint pipe 112 communicating with the straight portion 12 is attached to the lower end portion in the axis X direction. Thereby, the valve chamber 1A and the secondary joint pipe 112 can be conducted.
A valve guide member 13 is press-fitted and swaged to the valve housing 1 so as to be inserted into the valve chamber 1A from above, and a valve guide hole 13a is formed in the center of the valve guide member 13. A rim 1a is formed at the upper end portion of the valve housing 1 so as to surround the upper end outer peripheral portion of the valve guide member 13, and a cylindrical housing 14 is assembled to the valve housing 1 so as to fit into the outer periphery of the rim 1 a. The housing 14 is fixed to the valve housing 1 by caulking the rim 1a and brazing the bottom outer periphery. The support member 2 is attached to an upper end opening of the housing 14.
The support member 2 has a substantially columnar bracket portion 21 made of synthetic resin, and a flange portion 22 made of stainless steel integrally provided on a portion of the bracket portion 21 close to the valve housing 1 by insert molding, and the support member 2 is fixed to the housing 14 by welding the flange portion 22 to an opening periphery of the housing 14. In the center of the bracket portion 21 of the support member 2, a female screw portion 21a coaxial with the axis X of the valve port 11 and a screw hole thereof are formed, and a shaft guide hole 21b connected to the screw hole of the female screw portion 21a is formed, and a cylindrical slide hole 21c having a diameter larger than the diameter of the inner periphery of the shaft guide hole 21b is formed. A cylindrical bar-shaped rotor shaft 3 is disposed in the screw hole of the female screw portion 21a and the shaft guide hole 21 b. A male screw portion 3a is formed on the outer periphery of the rotor shaft 3, and the male screw portion 3a is screwed with the female screw portion 21a of the bracket portion 21.
The holder 21 has a guide male screw 211 formed of a spiral-shaped ridge formed on the outer periphery thereof, a lower end stopper 212 protruding in the radial direction formed at one end of the lower side of the guide male screw 211, and an upper end stopper 213 formed on the outer periphery of the upper end portion of the guide male screw 211. A coil-shaped follower slider 214 is screwed to the outer periphery of the guide male screw 211. The follower slider 214 rotates in the same direction in association with the rotation of the magnetic rotor 62 described below, and moves in the same direction (up-down) as the rotor shaft 3 along the guide male screw 211. Then, the follower slider 214 is brought into contact with the lower end stopper 212 or the upper end stopper 213, thereby restricting the vertical stop position of the magnetic rotor 62.
The valve frame 4 is slidably fitted in the slide hole 21c of the support member 2 along the axis X, and the valve frame 4 holds a needle valve 5 as a "valve member" at a lower portion. The valve frame 4 has a boss 42 fixed to a lower end of a cylindrical portion 41, and a spring seat 43, a compression coil spring 44, and a washer 45 provided in the cylindrical portion 41. The needle valve 5 is formed of a metal member such as stainless steel or brass, and has a needle portion 51 having a semi-ellipsoidal shape at a lower end, a cylindrical rod-like stem portion 52 extending from the needle portion 51 in the direction of the axis X, and a flange portion 53 formed at an upper end of the stem portion 52. The needle valve 5 is inserted into the insertion hole 42a of the boss 42 of the valve frame 4, and the flange 53 is attached to the valve frame 4 so as to abut against the boss 42. The stem 52 of the needle valve 5 is inserted into the valve guide hole 13a of the valve guide member 13. Further, the cylindrical portion 41 of the valve frame 4 engages with the rotor shaft 3. That is, a flange portion 3b is integrally formed at the lower end portion of the rotor shaft 3, and the flange portion 3b is sandwiched by a washer 45 together with the upper end portion of the cylindrical portion 41, and the lower end portion of the rotor shaft 3 is rotatably engaged with the upper end portion of the cylindrical portion 41. By this engagement, the valve frame 4 is rotatably supported by the rotor shaft 3 in a suspended state.
A sealed case 61 is hermetically fixed to the upper end of the case 14 by welding or the like, and a magnetic rotor 62 having an outer peripheral portion magnetized to be multipolar and a rotor shaft 3 fixed to the center thereof are provided in the sealed case 61. A stator coil 63 is disposed on the outer periphery of the hermetic case 61, and the magnetic rotor 62, the rotor shaft 3, and the stator coil 63 constitute the stepping motor 6. Then, by inputting a pulse signal to the stator coil 63, the magnetic rotor 61 rotates according to the number of pulses, and the rotor shaft 3 rotates.
With the above configuration, when the stepping motor 6 is driven, the magnetic rotor 62 and the rotor shaft 3 rotate, and the rotor shaft 3 moves in the axis X direction by the screw feeding mechanism of the male screw portion 3a of the rotor shaft 3 and the female screw portion 21a of the support member 2. The needle valve 5 moves along the axis X direction together with the valve frame 4 by the movement of the rotor shaft 3 along the axis X direction due to the rotation. The needle valve 5 advances and retreats in the axis X direction in a state in which the needle 51 is inserted into the valve port 11, and increases and decreases the opening area of the valve port 11. Thereby, the flow rate of the fluid (refrigerant) flowing from the primary joint pipe 111 to the secondary joint pipe 112 or from the secondary joint pipe 112 to the primary joint pipe 111 is controlled.
The shaft guide hole 21b of the support member 2 is a cylindrical hollow, and constitutes an "on-shaft guide hole". The rotor shaft 3 inserted into the shaft guide hole 21b constitutes a "guided portion" that moves integrally with the male screw portion 3a in the direction of the axis X and is held on the axis X by the shaft guide hole 21 b. In the first embodiment, the sleeve member 71 is disposed in the constricted portion 31 formed in the lower portion of the male screw portion 3a of the rotor shaft 3.
As shown in fig. 2 (B), the sleeve member 71 is made of a C-shaped elastic material, and is fitted into the constricted portion 31 of the rotor shaft 3. Further, since the sleeve member 71 is lightly pressed into the shaft guide hole 21b of the support member 2, the outer periphery of the sleeve member 71 is in contact with the inner surface of the shaft guide hole 21b, and the sliding resistance with the inner peripheral surface of the shaft guide hole 21b is kept small. When the rotor shaft 3 is moved in the valve closing direction (downward) from the state of fig. 3 (a) to the state of fig. 3 (B), the male screw portion 3a biases the sleeve member 71 downward, and the sleeve member 71 applies a load to the inner peripheral surface of the shaft guide hole 21B in the outer diameter direction. At the same time, the sleeve member 71 applies a load to the outer peripheral surface of the constricted portion 31 of the rotor shaft 3 in the inner radial direction. This can suppress vibration and inclination of the rotor shaft 3 caused by the clearance in the "screw feed mechanism" constituted by the male screw portion 3a and the female screw portion 21 a. Therefore, the operability of the electric valve is stable.
Fig. 4 is a longitudinal sectional view of the motor-operated valve according to the second embodiment, and in the following embodiments, the same components and the same elements are denoted by the same reference numerals, and detailed description thereof is omitted. The second embodiment of fig. 4 is different from the first embodiment in that a cylindrical valve frame 4 'is formed integrally with the rotor shaft 3 at the lower end of the rotor shaft 3, and a sleeve member 72 is disposed on the outer periphery of the valve frame 4'. That is, in the second embodiment, the slide hole 21c of the support member 2 is a cylindrical hollow, and constitutes an "on-axis guide hole". The valve frame 4' inserted into the slide hole 21c constitutes a "guided portion" that moves integrally with the male screw portion 3a (and the rotor shaft 3) in the direction of the axis X and is held on the axis X by the slide hole 21c. In the second embodiment, the sleeve member 72 is disposed in the constricted portion 4a 'formed around the valve frame 4'. In this embodiment, the needle valve 5 is held in the valve frame 4' by a spring seat 43' and a compression coil spring 44 '.
In the second embodiment, since the sleeve member 72 is lightly pressed into the sliding hole 21c of the support member 2, the outer periphery of the sleeve member 72 is in contact with the inner surface of the sliding hole 21c, and the sliding resistance with the inner peripheral surface of the sliding hole 21c is kept small. Then, when the rotor shaft 3 moves in the valve closing direction (downward), the sleeve member 72 applies a load to the inner peripheral surface of the slide hole 21c in the outer diameter direction. At the same time, the sleeve member 72 applies a load to the outer peripheral surface of the constricted portion 4a 'formed in the valve frame 4' in the inner radial direction. This can suppress vibration and inclination of the rotor shaft 3 caused by the clearance in the "screw feed mechanism" constituted by the male screw portion 3a and the female screw portion 21 a. Therefore, the operability of the electric valve is stable. The sleeve member 72 may be made of a C-shaped elastic material as in the first embodiment.
Fig. 5 is a longitudinal sectional view of an electrically operated valve according to a third embodiment in which a sleeve member 73 is disposed between a valve holder 4' and a sliding hole 21c of a support member 2, as in the second embodiment, and in which the sleeve member 73 is fitted into a constricted portion (concave portion) 21c1 of the inner periphery of the sliding hole 21c. The third embodiment functions in the same manner as the second embodiment, in that the slide hole 21c of the support member 2 constitutes a hollow "on-shaft guide hole" having a cylindrical shape, and the valve frame 4' constitutes a "guided portion" held on the axis X by the slide hole 21c. Further, in this third embodiment, since the valve guide 4' is lightly pressed into the sleeve member 73, the inner periphery of the sleeve member 73 is in contact with the outer peripheral surface of the valve guide 4', and the sliding resistance with the outer peripheral surface of the valve guide 4' is kept small. Then, when the rotor shaft 3 moves in the valve closing direction (downward), the sleeve member 73 applies a load to the outer peripheral surface of the valve guide 4' in the inner radial direction. At the same time, the sleeve member 73 applies a load to the inner peripheral surface of the constricted portion (concave portion) 21c1 of the inner periphery of the slide hole 21c in the outer diameter direction. This can suppress vibration and inclination of the rotor shaft 3 caused by the clearance in the "screw feed mechanism" constituted by the male screw portion 3a and the female screw portion 21 a. Therefore, the operability of the electric valve is stable. The sleeve member 73 may be made of a C-shaped elastic material as in the first embodiment.
Fig. 6 is a longitudinal sectional view of an electric valve according to a fourth embodiment, which includes a stepping motor 10 as an "electric motor", a valve housing 20 as a "valve body", a valve mechanism portion 30, and a closed casing 40 made of a non-magnetic material.
The airtight housing 40 is formed in a substantially cylindrical shape with an upper end portion sealed, and is hermetically fixed to the upper end of the valve housing 20 by welding or the like. The stepping motor 10 is constituted by the rotor shaft 3, the magnetic rotor 10b rotatably disposed in the sealed housing 40, the stator coil 10c disposed on the outer periphery of the sealed housing 40 so as to face the magnetic rotor 10b, and other not-shown yokes, exterior members, and the like, which are similar to those of the above-described embodiment. The rotor shaft 3 is attached to the center of the magnetic rotor 10b, and the rotor shaft 3 extends toward the valve mechanism 30.
The valve housing 20 is formed of stainless steel or the like in a substantially cylindrical shape, and has a valve chamber 20R on the inner side thereof. A primary joint pipe 111 that communicates with the valve chamber 20R is connected to one side of the outer periphery of the valve housing 20, and a secondary joint pipe 112 is connected to a cylindrical portion extending downward from the lower end. A valve seat ring 20c having a valve port 20c1 is fitted to the valve chamber 20R side of the secondary joint pipe 112, and the secondary joint pipe 112 is connected to the valve chamber 20R via the valve port 20c 1.
The valve mechanism portion 30 has a support member 30a, a valve frame 4', and a needle valve 30c as a "valve member". The support member 30a is made of, for example, a synthetic resin, is formed in a substantially cylindrical shape, has a metal flange portion 30d integrally provided on the outer periphery thereof by insert molding, and is fixed to the upper end portion of the valve housing 20 via the flange portion 30 d. Further, a female screw portion 30a1 coaxial with the axis X of the rotor shaft 3 and a screw hole thereof are formed in the center of the support member 30a, and a cylindrical slide hole 30e as an "on-shaft guide hole" having a diameter larger than that of the screw hole of the female screw portion 30a1 is formed.
Like the second and third embodiments, a cylindrical valve frame 4' is integrally formed with the rotor shaft 3 at the lower end of the rotor shaft 3. A sleeve member 74 is disposed between the valve frame 4' and the slide hole 30e of the support member 30 a. In the fourth embodiment, a sleeve member 74 is fitted into a constricted portion (concave portion) 30e1 of the inner periphery of the slide hole 30e. That is, in the fourth embodiment, the slide hole 30e of the support member 30 is a cylindrical hollow, and constitutes an "on-axis guide hole". The valve frame 4' inserted into the slide hole 30e constitutes a "guided portion" that moves integrally with the male screw portion 3a (and the rotor shaft 3) in the direction of the axis X and is held on the axis X by the slide hole 30e. In the fourth embodiment, the needle valve 30c is held in the valve frame 4' by the spring seat 43' and the compression coil spring 44 '.
In the fourth embodiment, since the valve guide 4' is lightly pressed into the sleeve member 74, the inner periphery of the sleeve member 74 contacts the outer peripheral surface of the valve guide 4', and the sliding resistance with the outer peripheral surface of the valve guide 4' is kept small. Then, when the rotor shaft 3 moves in the valve closing direction (downward), the sleeve member 74 applies a load to the outer peripheral surface of the valve guide 4' in the inner radial direction. At the same time, the sleeve member 74 applies a load to the inner peripheral surface of the constricted portion (concave portion) 30e1 of the slide hole 30e in the outer diameter direction. This can suppress vibration and inclination of the rotor shaft 3 caused by the clearance in the "screw feed mechanism" constituted by the male screw portion 3a and the female screw portion 30a 1. Therefore, the operability of the electric valve is stable.
In the fourth embodiment, an inner case 81 is fitted to an upper portion in the sealed case 40, and a bearing member 83 is fitted into a guide tube 82 in the center of the inner case 81. An upper end portion (end portion) of the rotor shaft 3 is inserted into the bearing member 83, and the rotor shaft 3 is rotatably fitted into the bearing member 83. A rotation limiting mechanism is formed on the outer periphery of the guide tube 82 of the inner housing 81. That is, a spiral guide wire body 84 is fitted to the outer periphery of the guide tube 82, and a movable stopper member 85 screwed to the spiral guide wire body 84 is provided. Then, as the magnetic rotor 10b rotates, the movable stopper member 85 moves up and down while turning by engaging with the screw of the screw guide 83, and the movable stopper member 85 abuts against the lower end stopper 83a of the screw guide 83 or the upper end stopper 81a of the inner case 81, thereby restricting the rotation range of the magnetic rotor 10b, that is, the lower end position and the upper end position.
Fig. 7 is a longitudinal sectional view of an electric valve according to a fifth embodiment, which differs from the fourth embodiment in that a sleeve member 75 is disposed in a constricted portion 4a 'formed around a valve frame 4', and the other configuration is the same as the fourth embodiment.
Further, in this fifth embodiment, since the sleeve member 75 is lightly pressed into the sliding hole 30e of the support member 30, the outer periphery of the sleeve member 75 is in contact with the inner surface of the sliding hole 30e, and the sliding resistance with the inner peripheral surface of the sliding hole 30e is kept small. Then, when the rotor shaft 3 moves in the valve closing direction (downward), the sleeve member 75 applies a load to the inner peripheral surface of the sliding hole 30e in the outer diameter direction. At the same time, the sleeve member 75 applies a load to the outer peripheral surface of the constricted portion 4a 'formed in the valve frame 4' in the inner radial direction. This can suppress vibration and inclination of the rotor shaft 3 caused by the clearance in the "screw feed mechanism" constituted by the male screw portion 3a and the female screw portion 30a 1. Therefore, the operability of the electric valve is stable.
Fig. 8 is a longitudinal sectional view of an electrically operated valve according to a sixth embodiment, which differs from the fourth and fifth embodiments in that; the construction of the interior of the valve frame 4; the connection structure of the valve frame 4 and the rotor shaft 3 is the same as that of the first embodiment; and a sleeve member 76 is provided inside the rotation limiting mechanism. The other structure is the same as that of the fourth embodiment and the fifth embodiment.
In the sixth embodiment, the upper end portion 3A of the rotor shaft 3 is disposed in the guide tube 42 in the center of the inner housing 41, and the sleeve member 76 is disposed on the outer periphery of the upper end portion 3A of the rotor shaft 3. That is, in the sixth embodiment, the guide tube 42 in the center of the inner case 41 is a cylindrical hollow, and the inner periphery of the guide tube 42 constitutes an "on-axis guide hole". The constricted portion 3A of the upper end portion of the rotor shaft 3 inserted into the guide tube 42 constitutes a "guided portion" that moves integrally with the male screw portion 3A (and the rotor shaft 3) in the direction of the axis X and is held on the axis X by the guide tube 42.
In the sixth embodiment, since the sleeve member 76 (and the upper end portion 3A of the rotor shaft) is lightly pressed into the guide tube 42, the outer periphery of the sleeve member 76 is in contact with the inner peripheral surface of the guide tube 42, and the sliding resistance with the inner peripheral surface of the guide tube 42 is kept small. Then, when the rotor shaft 3 moves in the valve closing direction (downward), the sleeve member 76 applies a load to the inner peripheral surface of the guide tube 42 in the outer diameter direction. At the same time, the sleeve member 76 applies a load to the outer peripheral surface of the constricted portion 3A of the rotor shaft 3 in the inner radial direction. This can suppress vibration and inclination of the rotor shaft 3 caused by the clearance in the "screw feed mechanism" constituted by the male screw portion 3a and the female screw portion 30a 1. Therefore, the operability of the electric valve is stable. The sleeve member 76 may be made of a C-shaped elastic material.
In each embodiment, the sleeve member is exemplified by a C-shaped elastic material, but the shape is not limited thereto, and the sleeve member may be any shape as long as a load is applied to the guided portion and the on-axis guide hole in the opposite direction in the radial direction.
Fig. 9 is a diagram showing a refrigeration cycle system according to an embodiment. In the figure, reference numeral 100 denotes an electric valve according to an embodiment of the present invention, which constitutes an expansion valve, 200 denotes an outdoor heat exchanger mounted in an outdoor unit, 300 denotes an indoor heat exchanger mounted in an indoor unit, 400 denotes a flow path switching valve, which constitutes a four-way valve, and 500 denotes 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 pipes as shown in the drawing, respectively, to constitute a heat pump type refrigeration cycle. The illustration of the accumulator, the pressure sensor, the temperature sensor, and the like is omitted.
The flow path of the refrigeration cycle is switched by the flow path switching valve 400 to two flow paths, i.e., a flow path in the cooling operation and a flow path in the heating operation. In the cooling operation, as shown by solid arrows in the figure, the refrigerant compressed by the compressor 500 flows into the outdoor heat exchanger 200 from the flow path switching valve 400, the outdoor heat exchanger 200 functions as a condenser, the liquid refrigerant flowing out of the outdoor heat exchanger 200 flows into the indoor heat exchanger 300 through the motor-operated valve 100, and the indoor heat exchanger 300 functions as an evaporator.
On the other hand, during the heating operation, as indicated by the broken-line arrow in the figure, the refrigerant compressed by the compressor 500 circulates from the flow path switching valve 400 in the order of the indoor heat exchanger 300, the motor valve 100, the outdoor heat exchanger 200, the flow path switching valve 400, and the compressor 500, and the indoor heat exchanger 300 functions as a condenser and the outdoor heat exchanger 200 functions as an evaporator. The electric valve 100 decompresses and expands the liquid refrigerant flowing in from the outdoor heat exchanger 200 during the cooling operation or the liquid refrigerant flowing in from the indoor heat exchanger 300 during the heating operation, respectively, and further controls the flow rate of the refrigerant.
The embodiments of the present invention have been described in detail above with reference to the drawings, but the specific configuration is not limited to the above embodiments, and design changes and the like within the scope of the gist of the present invention are also included in the present invention.
Claims (6)
1. An electric valve comprising a female screw portion formed on a support member on a valve body side and a male screw portion formed on a rotor shaft of an electric motor and penetrating a center of the female screw portion, wherein a screw feed mechanism of the female screw portion and the male screw portion converts a rotational motion of a magnetic rotor of the electric motor into a linear motion in an axial direction of the rotor shaft, and a valve member coupled to the rotor shaft controls an opening degree of a valve port,
the above-mentioned electric valve is characterized in that,
the device is provided with: a guided portion that moves integrally with the rotor shaft in the axial direction; an on-axis guide hole that forms a cylindrical cavity through which the guided portion is inserted and which holds the guided portion on the axis; and a sleeve member provided between the guided portion and the shaft guide hole,
either the guided portion or the shaft guide hole includes a constricted portion,
the sleeve member is provided in the constricted portion,
in the case where the guided portion includes the constricted portion,
the sleeve member is made of an elastic material which is lightly pressed into the shaft guide hole,
in a range in which the guided portion can move in the axial direction,
the inner circumference of the guide hole on the shaft opposite to the contraction part is the same diameter,
in the case where the shaft-guide hole includes the constricted portion,
the sleeve member is made of an elastic material that is lightly pressed into the guided portion,
in a range in which the guided portion can move in the axial direction,
the outer circumference of the guided portion facing the constricted portion has the same diameter.
2. The electrically operated valve as set forth in claim 1, wherein,
the shaft guide hole is formed coaxially with the female screw portion in the support member, and the guided portion is a constricted portion formed coaxially with the male screw portion of the rotor shaft.
3. The electrically operated valve as set forth in claim 1, wherein,
the shaft guide hole is a slide hole formed in the support member coaxially with the female screw portion, and the guided portion is a valve frame formed integrally with the rotor shaft and disposed in the slide hole so as to hold the valve member.
4. The electrically operated valve as set forth in claim 1, wherein,
the valve member is provided with a stopper mechanism for restricting a rotation range of the magnetic rotor at an end portion of the rotor shaft opposite to the valve member, a guide tube is provided at a center of the stopper mechanism, the end portion of the rotor shaft is inserted therethrough, the shaft guide hole is a hole in an inner periphery of the guide tube, and the guided portion is the end portion of the rotor shaft.
5. The electrically operated valve as claimed in any one of claims 1 to 4, wherein,
the sleeve is made of an elastic material, and applies a load to contact surfaces respectively contacting an inner periphery of the shaft guide hole and an outer periphery of the guided portion in opposite directions in a radial direction.
6. A refrigeration cycle system comprises a compressor, a condenser, an expansion valve and an evaporator, and is characterized in that,
use of the electrically operated valve as claimed in any one of claims 1 to 5 as the above expansion valve.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2020-018726 | 2020-02-06 | ||
| JP2020018726A JP7359711B2 (en) | 2020-02-06 | 2020-02-06 | Electric valve and refrigeration cycle system |
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| Publication Number | Publication Date |
|---|---|
| CN113294527A CN113294527A (en) | 2021-08-24 |
| CN113294527B true CN113294527B (en) | 2023-09-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110071552.1A Active CN113294527B (en) | 2020-02-06 | 2021-01-19 | Electric valve and refrigeration cycle system |
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| Country | Link |
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| JP (2) | JP7359711B2 (en) |
| CN (1) | CN113294527B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117515199A (en) * | 2022-07-27 | 2024-02-06 | 广东威灵电机制造有限公司 | Electronic expansion valve assembly, electronic expansion valve and refrigeration equipment |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012189088A (en) * | 2011-03-08 | 2012-10-04 | Ckd Corp | Manual valve |
| CN105276200A (en) * | 2014-07-18 | 2016-01-27 | 株式会社鹭宫制作所 | Electric valve |
| CN108343776A (en) * | 2017-01-25 | 2018-07-31 | 株式会社鹭宫制作所 | Motor-driven valve and refrigerating circulation system |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1433415A (en) * | 1965-02-08 | 1966-04-01 | Commissariat Energie Atomique | Braking device |
| US6808455B1 (en) * | 2000-05-03 | 2004-10-26 | Michael Solorenko | Torsional shock absorber for a drill string |
| JP2006292149A (en) * | 2005-04-14 | 2006-10-26 | Fuji Koki Corp | Motor operated valve |
| JP2007016830A (en) * | 2005-07-06 | 2007-01-25 | Nissan Motor Co Ltd | Rubber bush |
| JP2014180976A (en) * | 2013-03-21 | 2014-09-29 | Toray Ind Inc | Vibration-proof rubber |
| JP6218029B2 (en) * | 2013-11-29 | 2017-10-25 | 株式会社テージーケー | Stepping motor driven control valve |
| JP2016080115A (en) * | 2014-10-21 | 2016-05-16 | 株式会社鷺宮製作所 | Fluid control valve |
| JP6521890B2 (en) * | 2016-03-09 | 2019-05-29 | 株式会社鷺宮製作所 | Motorized valve |
| WO2018137636A1 (en) | 2017-01-26 | 2018-08-02 | 浙江三花智能控制股份有限公司 | Electronic expansion valve |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012189088A (en) * | 2011-03-08 | 2012-10-04 | Ckd Corp | Manual valve |
| CN105276200A (en) * | 2014-07-18 | 2016-01-27 | 株式会社鹭宫制作所 | Electric valve |
| CN108343776A (en) * | 2017-01-25 | 2018-07-31 | 株式会社鹭宫制作所 | Motor-driven valve and refrigerating circulation system |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2023168434A (en) | 2023-11-24 |
| JP2021124180A (en) | 2021-08-30 |
| JP7481562B2 (en) | 2024-05-10 |
| JP7359711B2 (en) | 2023-10-11 |
| CN113294527A (en) | 2021-08-24 |
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