JP6726116B2 - Motorized valve and refrigeration cycle system - Google Patents

Description

The present invention relates to an electric valve and a refrigeration cycle system used for a refrigeration cycle system and the like.

2. Description of the Related Art Conventionally, there is an electric valve of this type in which a rotor shaft is directly moved by a rotation of a magnet rotor of a stepping motor via a screw feed mechanism, and a valve member connected to the rotor shaft opens and closes a valve port. Such a motor-operated valve is disclosed in, for example, JP-A-2016-156447 (Patent Document 1) and JP-A-2015-90204 (Patent Document 2).

The conventional motor-operated valve of Patent Document 1 has a structure in which a magnet rotor and a valve shaft (rotor shaft) are fixed, and the valve shaft is inserted into a connecting body (fixing member) provided in an axial core portion of the magnet rotor, and this connection is made. The body and the valve shaft are fixed by welding or the like.

JP, 2016-156447, A JP, 2005-90204, A

As described above, when the connecting body (fixing member) provided on the shaft core portion of the magnet rotor and the valve shaft (rotor shaft) are fixed by welding, the respective heat capacities of the connecting body and the valve shaft have an appropriate relationship. Required to do so. For example, when the heat capacity of the valve shaft is smaller than that of the connected body, excessive welding heat may be applied to the valve shaft and the valve shaft may be deformed. In addition, the valve shaft may be melted first and the connection body may not be sufficiently melted to obtain sufficient fixing strength, and the connection body may come off the valve shaft.

According to the present invention, in a motor-operated valve in which a motor portion rotates a magnet rotor and a rotor shaft, and a valve port is opened/closed by forward/backward movement of a valve member accompanying rotation of the rotor shaft, a fixing member of the magnet rotor and a rotor shaft are fixed by welding. However, it is an object of the present invention to provide a motor-operated valve capable of preventing deformation of the rotor shaft and improving fixing strength.

The motor-operated valve according to claim 1, wherein the motor unit rotates the magnet rotor and the metal rotor shaft, and the valve port is opened and closed by the forward and backward movement of the valve member due to the rotation of the rotor shaft. A magnet main body having magnetism, and a metal fixing member integrally formed with the magnet main body at the center of the magnet main body, the fixing member being coupled to the magnet main body by the integral molding. And a fixed cylindrical member having a diameter smaller than the outer diameter of the fixed member main body and smaller in volume than the fixed member main body. The volume of the member main body is at least three times the volume of the cylindrical portion, and an insertion hole is provided to penetrate the fixed member main body portion and the cylindrical portion in the axial direction of the rotor shaft, and the rotor shaft is inserted through the insertion hole. While being inserted into the hole, the cylindrical portion and the rotor shaft are fixed by welding at a part of the periphery of the opening end portion of the insertion hole, and an inner diameter corner portion of the opening end portion of the cylindrical portion. Is a thread chamfered shape of C0.1 or less, and the opening end of the insertion hole of the cylindrical portion and the rotor shaft are welded at a plurality of rotationally symmetrical positions around the axis of the rotor shaft. The molten and solidified portions formed by the welding are formed over an angle range of 90° or less around the axis .

The motor-operated valve according to claim 2 is the motor-operated valve according to claim 1, wherein the opening end portion of the insertion hole of the cylindrical portion and the rotor shaft are provided at two opposing positions around the axis of the rotor shaft. It is welded, and each molten and solidified portion formed by the welding is formed within a range of 45° to 90° around the axis.

The motor-operated valve according to claim 3 is the motor-operated valve according to claim 1 or 2 , wherein the shape of the inner diameter corner portion of the opening end of the cylindrical portion is changed to the thread chamfered shape, It is characterized in that it has an edge shape in contact with the outer circumference.

A motor-operated valve according to a fourth aspect is the motor-operated valve according to any one of the first to third aspects, wherein the rotor shaft and the fixing member are made of the same material.

The motor-operated valve according to claim 5 is the motor-operated valve according to any one of claims 1 to 4 , wherein the fixing member main body has a columnar shape, and a dimension of the fixing member main body in the axial direction is Is larger than the dimension of the cylindrical portion in the axial direction.

A motor-operated valve according to claim 6 is the motor-operated valve according to any one of claims 1 to 5 , wherein a diameter of the rotor shaft is D, a radial thickness of the cylindrical portion is t, and the cylindrical portion is When the dimension in the axial direction of is H,
t<D/2, H/t≧1
Is characterized in that
The motor-operated valve according to claim 7 is the motor-operated valve according to any one of claims 1 to 6 , wherein the rotor shaft is located on a side opposite to the valve member, and A second shaft portion that is located adjacent to an end portion of the one shaft portion on the valve member side and has a length that is equal to or less than the length of the first shaft portion and that is larger in diameter than the first shaft portion; The cylindrical portion and the rotor shaft are fixed such that a surface of the fixing member on the valve member side is located at a boundary portion between the first shaft portion and the second shaft portion. ..
The motor-operated valve according to claim 8 is the motor-operated valve according to any one of claims 1 to 7 , wherein the magnet main body includes a cylindrical magnet portion and a substantially axial portion inside the magnet portion in the axial direction. A disc portion that extends to the central portion and has a boss portion that protrudes toward the valve member side provided at the center, and the fixing member main body portion is the valve member in the disc portion in the axial direction. Is coupled to the disk portion so as to extend from the opposite surface to the end of the boss portion on the valve member side.

A refrigeration cycle system according to claim 9 is 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 8 is provided. It is used as the expansion valve.

According to the motor-operated valve of claims 1 to 8, the cylindrical portion having a smaller diameter, smaller volume, and smaller heat capacity than the outer diameter of the fixing member main body is not welded all around but is partially welded. Welding can be performed to suppress the generation of welding heat, and the amount of penetration can be increased within the range where there is no deformation of the rotor shaft due to welding heat, so the partial strength acts as an improvement in the overall joint strength, and the magnet rotor (part of it) The fixed member) does not come off the rotor shaft. Further, since the outer diameter of the fixed member main body coupled to the magnet main body is larger than that of the cylindrical portion joined by welding, the torque of the magnet main body is reasonably transmitted to the fixed member main body when the magnet rotor rotates. It is possible to prevent the fixing member from coming off from the magnet body.

Further , according to the motor-operated valve of claim 1 or 3 , since the inner diameter corner portion of the upper end of the cylindrical portion has an edge shape or a thread chamfered shape of C0.1 or less, the end of the fixing member (cylindrical portion). In the portion, the gap between the rotor shaft and the rotor shaft becomes small, the weldability is improved and the fixing strength is further improved even with respect to variations in parts and welding.

According to the motor-operated valve of the fourth aspect , since the rotor shaft and the fixing member are made of the same material, they have the same thermal conductivity, the rotor shaft and the fixing member are evenly melted, and the fixing strength is further improved. For example, the rotor shaft does not melt first.

According to the motor-operated valve of the fifth aspect , the fixing member main body has a columnar shape, and the axial dimension of the fixing member main body is larger than the axial dimension of the cylindrical portion. Therefore, the heat capacity of the fixing member main body can be sufficiently secured, and the influence of welding heat on the magnet main body can be suppressed.

According to the refrigeration cycle system of claim 9, the same effects as those of claims 1 to 8 can be obtained.

It is a longitudinal section of an electric valve of an embodiment of the present invention. FIG. 3 is an enlarged cross-sectional view of a main part of a magnet rotor and a rotor shaft in the electric valve of the embodiment. It is an AA arrow line view of FIG. FIG. 3 is a sectional view and a partially enlarged view taken along the line BB of FIG. 2. It is a figure which shows the modification 1 of the fixing member of embodiment. It is a figure which shows the modification 2 of the fixing member of embodiment. It is a figure which shows the modification 3 of the fixing member of embodiment. It is a figure showing the refrigerating cycle system of an embodiment.

Next, embodiments of the motor-operated valve and the refrigeration cycle system of the present invention will be described with reference to the drawings. 1 is a vertical cross-sectional view of the electric valve of the embodiment, FIG. 2 is an enlarged cross-sectional view of a main part of a magnet rotor and a rotor shaft in the electric valve of the embodiment, FIG. 3 is an AA arrow view of FIG. 2, and FIG. FIG. 3 is a sectional view and a partially enlarged view taken along line BB of FIG. 2. The concept of “upper and lower” in the following description corresponds to the upper and lower parts in the drawing of FIG.

The electric valve 100 includes a stepping motor 10 as a “motor unit”, a valve housing 40, a valve mechanism unit 50, and a sealed case 60 made of a non-magnetic material.

The stepping motor 10 is composed of a rotor shaft 1, a magnet rotor 2 rotatably arranged inside a sealed case 60, and a stator unit 3 arranged on the outer periphery of the sealed case 60 so as to face the magnet rotor 2. Has been done. As will be described later, the rotor shaft 1 is attached to the center of the magnet rotor 2, and the rotor shaft 1 is extended to the valve mechanism section 50 side. The stator unit 3 includes a resin bobbin 31, a pair of upper and lower data coils 32 wound around the bobbin 31, and a yoke 33 made of a magnetic material. Then, the outer peripheral end of the yoke 33 is fitted into the cylindrical gaikan 34, and the yoke 33 and the cylindrical gaican 34 are sealed by a resin mold 35.

The valve housing 40 is made of stainless steel or the like and has a substantially cylindrical shape, and has a valve chamber 40R inside thereof. A first joint pipe 41 connected to the valve chamber 40R is connected to one outer peripheral side of the valve housing 40, and a second joint pipe 42 is connected to a tubular portion extending downward from the lower end. A valve seat ring 43 is fitted on the valve chamber 40R side of the second joint pipe 42. Inside the upper end of the valve seat ring 43 is a valve port 43a, and the second joint pipe 42 is electrically connected to the valve chamber 40R via the valve port 43a. The first joint pipe 41, the second joint pipe 42, and the valve seat ring 43 are fixed to the valve housing 40 by brazing or the like.

The valve mechanism section 50 has a support member 51, a valve holder 52, and a needle valve 53 as a “valve member”. The support member 51 is made of, for example, a synthetic resin and is formed into a substantially columnar shape. The support member 51 is fixed to the upper end of the valve housing 40 by welding or the like via a flange portion 511 made of stainless that is integrally provided by insert molding on the outer periphery thereof. Has been done. At the center of the support member 51, a female screw portion 51a coaxial with the axis L of the rotor shaft 1 and its screw hole are formed, and a cylindrical guide hole 51b having a diameter larger than the screw hole of the female screw portion 51a is formed. ing.

The valve holder 52 is a cylindrical member that is fitted in the guide hole 51b and is slidable in the direction of the axis L. The needle valve 53 is fixed to the lower end of the valve holder 52. A spring receiver 52a is provided in the valve holder 52 so as to be movable in the direction of the axis L, and a compression coil spring 52b is attached between the spring receiver 52a and the needle valve 53 in a state in which a predetermined load is applied.

A male screw portion 1a is formed on the outer periphery of the rotor shaft 1 on the support member 51 side, and the male screw portion 1a is screwed into the female screw portion 51a of the support member 51. In the guide hole 51b of the support member 51, the upper end of the valve holder 52 is engaged with the lower end of the rotor shaft 1, and the valve holder 52 and the needle valve 53 are rotatably suspended by the rotor shaft 1. It is supported.

The closed case 60 is formed in a substantially cylindrical shape with its upper end closed, and is hermetically fixed to the upper end of the valve housing 40 by welding or the like. A guide holding cylinder 61 is fitted in the upper part of the closed case 60, and a guide 62 is fitted in a cylindrical portion 61 a at the center of the guide holding cylinder 61. The guide 62 has a guide hole 62a at the center, and the upper end of the rotor shaft 1 is rotatably fitted in the guide hole 62a. On the outer circumference of the cylindrical portion 61a, a spiral guide wire 63 is mounted and a movable stopper member 64 screwed into the spiral guide wire 63 is provided.

With the above configuration, the magnet rotor 2 and the rotor shaft 1 are rotated by the driving of the stepping motor 10, and the rotor shaft 1 is rotated by the screw feed mechanism between the male screw portion 1a of the rotor shaft 1 and the female screw portion 51a of the support member 51. Move in the L direction. Then, the needle valve 53 moves in the direction of the axis L and approaches or separates from the valve seat ring 43. As a result, the valve port 43a is opened and closed, and the flow rate of the refrigerant flowing from the first joint pipe 41 to the second joint pipe 42 or from the second joint pipe 42 to the first joint pipe 41 is controlled.

Further, the magnet rotor 2 is formed with a protrusion 24, and the protrusion 24 kicks the movable stopper member 64 around as the magnet rotor 2 rotates, whereby the movable stopper member 64 and the spiral guide wire body 63 are formed. It moves up and down while turning by screwing. Then, the movable stopper member 64 comes into contact with the lower end stopper 63a of the spiral guide wire body 63, whereby the rotation stopper action at the lowermost end position of the rotor shaft 1 is obtained. Further, the movable stopper member 64 comes into contact with the upper end stopper 61b of the guide holding cylinder 61, whereby the rotation stopper action at the uppermost end position of the rotor shaft 1 is obtained.

As described above, in the motor-operated valve 100, the stepping motor 10 (motor unit) rotates the magnet rotor 2 and the metal rotor shaft 1, and the needle valve 53 moves back and forth as the rotor shaft 1 rotates to open and close the valve port 43a. It is a motorized valve.

The rotor shaft 1 is formed by processing a rod member made of stainless steel, and includes a first shaft portion 11 located above the support member 51 and a second shaft portion 12 having a diameter larger than that of the first shaft portion 11. And have. The male screw portion 1a is formed in a portion of the second shaft portion 12 that is inserted into the support member 51. Further, due to the difference in diameter between the first shaft portion 11 and the second shaft portion 12, the boundary between the first shaft portion 11 and the second shaft portion 12 has a second shaft from the side of the axis L of the rotor shaft 1. It has a stepped surface portion 13 which extends in the outer diameter direction of the portion 12 and is a surface orthogonal to the axis L of the rotor shaft 1.

The magnet rotor 2 has a cylindrical magnet portion 21 whose outer peripheral portion is magnetized to have multiple poles, a disk portion 22 which extends inside the magnet portion 21 at a substantially central portion in the direction of the axis L, and a boss portion at the center of the disk portion 22. It has a fixing member 23 that functions as a hub provided in 22a, and the above-mentioned protrusion 24. The magnet portion 21, the disk portion 22, and the protrusion 24 constitute a "magnet body" as an integrally formed member made of PPS or the like, and the magnet portion 21 is formed by mixing PPS or the like as a base material with magnetic powder. ing. The fixing member 23 is made of the same material as the rotor shaft 1 of stainless steel, and the fixing member 23 is integrally formed with the magnet portion 21 and the disk portion 22 (its boss portion 22a) by insert molding.

The fixing member 23 which is a part of the magnet rotor 2 is formed to have a cylindrical fixing member main body 231 and a cylindrical cylindrical portion 232 having a smaller diameter than the fixing member main body 231. 231 and the cylindrical portion 232 are coaxial with each other such that the axis L is the central axis. Further, the fixing member 23 has a cylindrical insertion hole 23a that penetrates the fixing member main body portion 231 and the cylindrical portion 232 in the axis L direction. Further, in the fixing member 23, the surface on the supporting member 51 side is a surface extending outward from the axis L with respect to the inner peripheral surface of the insertion hole 23a, and this surface contacts the step surface portion 13 of the rotor shaft 1. The contact surface portion 23b is capable of contacting.

In the magnet rotor 2, the rotor shaft 1 (first shaft portion 11) is inserted into the insertion hole 23 a of the fixed member 23, and the contact surface portion 23 b of the fixed member 23 is brought into contact with the step surface portion 13 of the rotor shaft 1. Has become. As a result, the magnet rotor 2 is positioned relative to the rotor shaft 1 in the direction of the axis L. Then, the rotor shaft 1 and the cylindrical portion 232 are welded at two locations (a part) around the periphery A (two-dot chain line in FIG. 2) of the opening end of the insertion hole 23a of the fixing member 23 on the cylindrical portion 232 side. The two melted and solidified portions 4 and 4 are formed by this welding. Further, as shown in FIG. 3, the melting and solidifying portions 4 and 4 are formed within the range of 45° to 90° around the axis L, respectively. The above-described welding method is, for example, laser welding, in which a laser spot is applied to the boundary between the opening end of the insertion hole 23a and the rotor shaft 1. At this time, the output (strength) of the laser is adjusted so that the depth of the melted and solidified portion 4 is such that the rotor shaft 1 and the fixing member 23 can be reliably fixed.

As described above, the fixing member 23 has the fixing member main body portion 231 which is joined to the magnet portion 21 and the disk portion 22 (magnet main body) by integral molding by insert molding. Also. It has a cylindrical portion 232 having a smaller diameter than the outer diameter of the fixing member main body 231 and a volume smaller than the volume of the fixing member main body 231. Then, the rotor shaft 1 is inserted into the insertion hole 23a, and the cylindrical portion 232 and the rotor shaft 1 are fixed by welding at a part of the periphery A around the opening end of the insertion hole 23a. That is, the cylindrical portion 232 having a smaller diameter, a smaller volume, and a smaller heat capacity than the outer diameter of the fixing member main body portion 231 is not entirely welded but partially welded. Therefore, welding can be performed so as to suppress the generation of excessive welding heat during welding. As a result, the amount of penetration can be increased within a range in which the rotor shaft 1 is not deformed by welding heat. Therefore, the partial strength of the melt-solidified portions 4 and 4 acts to improve the overall joint strength, and the magnet rotor 2 (fixing member 23) is prevented from coming off the rotor shaft 1. Since the fixed member main body 231 has an outer diameter larger than that of the cylindrical portion 232 joined by welding, the torque of the magnet main body can be transmitted to the fixed member main body 231 without difficulty when the magnet rotor 2 rotates. Therefore, the fixing member 23 does not come off from the magnet body.

Further, the opening end of the insertion hole 23a and the rotor shaft 1 are welded to each other at two opposing locations around the axis L of the rotor shaft 1, and the melted and solidified portions 4 and 4 by welding are 45° around the axis L. It is formed within a range of up to 90°. Therefore, welding can be performed so as to suppress the generation of excessive welding heat during welding.

Further, as shown in a partially enlarged view shown by a dashed-dotted circle in FIG. 4, an inner diameter corner portion of the insertion hole 23a at the upper end of the cylindrical portion 232 on the rotor shaft 1 side has a thread chamfered shape of C0.1 or less. There is. Therefore, in the end portion of the cylindrical portion 232 of the fixing member 23, the gap between the fixing member 23 and the rotor shaft 1 becomes small, and the welding property between the fixing member 23 and the rotor shaft 1 is improved even when the variation in parts and the variation in welding are caused. Strength is further improved. The inner diameter corner portion of the insertion hole 23a on the rotor shaft 1 side may have an edge shape.

Further, since the rotor shaft 1 and the fixing member 23 are both made of stainless steel and made of the same material, the thermal conductivity is the same, the rotor shaft 1 and the fixing member 23 are evenly melted, and the fixing strength is further improved. To do.

Further, the fixing member main body 231 has a cylindrical shape, and the dimension of the fixing member main body 231 in the axis L direction is larger than the dimension of the cylindrical portion 232 in the axis L direction. Therefore, the heat capacity of the fixing member main body 231 can be sufficiently secured, and the influence of welding heat on the “magnet main body” in which the magnet portion 21 and the disc portion 22 are integrated can be suppressed.

In addition, as shown in FIG. 2, the diameter of the first shaft portion 11 of the rotor shaft 1 is D, the radial thickness of the cylindrical portion 232 is t, and the dimension (height) of the cylindrical portion 232 in the direction of the axis L is H. , And when
t<D/2, H/t≧1
Has become. As a result, the heat capacity of the cylindrical portion 232 becomes suitable for welding with respect to the heat capacity of the rotor shaft 1, the weldability is improved, and the fixing strength is improved.

FIG. 5: is a figure which shows the modification 1 of a fixing member. 5 to 7 corresponding to Modifications 1 to 3 below, (A) is a plan view of the fixing member, (B) is a vertical sectional view of the fixing member, and (C) is a fixing member. It is a side view. Further, the magnet rotor 2 is not shown, and only the boss portion 22a is shown by a one-dot chain line in a vertical sectional view. The fixing member 25 of this modification 1 is made of stainless steel of the same material as the rotor shaft 1, and is integrally formed by insert molding together with the magnet portion 21 and the disc portion 22 (its boss portion 22a). In addition, the fixing member 25 of Modification 1 is formed to have a cylindrical fixing member main body portion 251 and a cylindrical cylindrical portion 252 having a smaller diameter than the fixing member main body portion 251, and the rotor shaft 1 It has a cylindrical insertion hole 25a through which it is inserted. The fixing member main body 251 of the first modification has the same shape as the fixing member main body 231. However, the cylindrical portion 252 has a smaller diameter than the cylindrical portion 232.

FIG. 6 is a diagram showing a second modification of the fixing member. The fixing member 26 of Modification 2 is made of the same material as the rotor shaft 1 and is made of stainless steel, and is integrally formed by insert molding together with the magnet portion 21 and the disc portion 22 (its boss portion 22a). Further, the fixing member 26 of Modification 2 is formed to have a substantially cylindrical fixing member main body portion 261 and a cylindrical cylindrical portion 262 having a smaller diameter than the fixing member main body portion 261 and the rotor shaft 1 It has a cylindrical insertion hole 26a for inserting. The fixing member main body 261 of the second modification has the same diameter as the fixing member main body 231 but has concave grooves 261a at four locations on the outer circumference. The cylindrical portion 262 has the same shape as the cylindrical portion 252 of the first modification. The size and shape of the recessed groove 261a are not limited to the sizes shown in the drawing, and may be small or large, and the recessed groove locations may be four or more locations or four or less locations instead of four locations.

FIG. 7: is a figure which shows the modification 3 of a fixing member. The fixing member 27 of the third modification is made of stainless steel of the same material as the rotor shaft 1, and is integrally formed with the magnet portion 21 and the disc portion 22 (its boss portion 22a) by insert molding. The fixing member 27 of Modification 3 is formed to have a fixing member main body 271 in the shape of a quadrangular prism and a cylindrical portion 272 having a smaller diameter than the fixing member main body 271 and the rotor shaft 1 It has a cylindrical insertion hole 27a for inserting. The maximum diameter portion of the fixing member main body portion 271 of Modification 3 has the same diameter as the fixing member main body portion 231. The cylindrical portion 272 has the same shape as the cylindrical portion 252 of the first modification.

As shown in FIG. 5(B), FIG. 6(B), and FIG. 7(B), in these modified examples 1 to 3 as well, each melt solidification by welding is performed at two opposing positions around the axis L of the rotor shaft 1. Portions 4 and 4 are formed respectively. In addition, in these modified examples 1 to 3, the fixing member body portions 251, 261, 271 have the same cross-sectional shape, and the maximum outer diameter thereof is the same. However, the volumes of the fixing member main bodies 251, 261, 271 are different from each other.

In addition, it is preferable that the volume of the fixing member main body portions 231, 251, 261, 271 in the above-described embodiment and the modified examples 1 to 3 is three times or more each of the volumes of the cylindrical portions 232, 252, 262, 272. is there. Further, the shape of the fixing member main body may be another shape, for example, a triangular shape, a pentagonal shape, or another prismatic shape.

Further, in the embodiment and each of the modified examples, an example in which welding is performed at two opposing positions around the axis L of the rotor shaft 1 has been described, but the number of welding points may be one around the axis L. In this case, it is preferable that the melt-solidified portion is formed in the range of 150° to 270° around the axis. Further, the welding positions are not limited to two opposite positions around the axis L and one position around the axis L, and the welding points may be a plurality of points around the axis L (for example, three or more positions). In this case, it is preferable to perform the welding at a rotationally symmetric position around the axis L, and the angle at which each melt-solidified portion is formed around the axis may be less than 45°.

FIG. 8 is a diagram showing the refrigeration cycle system of the embodiment. In the figure, reference numeral 100 is an electrically operated valve of the embodiment of the present invention that constitutes an “expansion valve”, 200 is an outdoor heat exchanger mounted in an outdoor unit, 300 is an indoor heat exchanger mounted in an indoor unit, and 400 is A flow path switching valve that constitutes a four-way valve, and 500 is a compressor. The motor-operated 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 drawing, and constitute a heat pump type refrigeration cycle system. The accumulator, pressure sensor, temperature sensor, etc. are not shown.

The flow path of the refrigeration cycle is switched by the flow path switching valve 400 to two paths, that is, the flow path during the cooling operation and the flow path during the heating operation. During the cooling operation, as shown by the solid arrow in the figure, the refrigerant compressed by the compressor 500 flows into the outdoor heat exchanger 200 from the flow path switching valve 400, and the outdoor heat exchanger 200 functions as a condenser. Then, the liquid refrigerant flowing out of the outdoor heat exchanger 200 flows into the indoor heat exchanger 300 via the electric valve 100, and the indoor heat exchanger 300 functions as an evaporator.

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

As described above, the embodiments of the present invention have been described in detail with reference to the drawings. However, the specific configuration is not limited to these embodiments, and changes in design within the scope not departing from the gist of the present invention. Even so, it is included in the present invention.

1 Rotor Shaft 1a Male Thread Part 2 Magnet Rotor 21 Magnet Part (Magnet Body)
22 Disc part (magnet body)
22a boss 23 fixing member 23a insertion hole 231 fixing member main body 232 cylindrical portion 25 fixing member 251 fixing member main body 252 cylindrical portion 25a insertion hole 26 fixing member 261 fixing member main body 262 cylindrical portion 26a insertion hole 27 fixing member 271 fixing Member main body portion 272 Cylindrical portion 27a Insertion hole 3 Stator unit 4 Melt solidification portion 10 Stepping motor (motor portion)
40 valve housing 41 1st joint pipe 42 2nd joint pipe 43 valve seat ring 43a valve port 50 valve mechanism section 51 support member 52 valve holder 53 needle valve (valve member)
51a Female thread portion 100 Motorized valve (expansion valve)
200 outdoor heat exchanger 300 indoor heat exchanger 400 flow path switching valve 500 compressor L axis

Claims (9)

In a motor-operated valve in which a motor section rotates a magnet rotor and a metallic rotor shaft, and a valve port is opened/closed by forward/backward movement of a valve member due to rotation of the rotor shaft,
The magnet rotor includes a magnet main body having magnetism, and a metal fixing member integrally formed with the magnet main body at the center of the magnet main body,
The fixing member is a cylindrical member having a diameter smaller than an outer diameter of the fixing member main body and a fixing member main body joined to the magnet main body by the integral molding, and having a volume smaller than the volume of the fixing member main body. And a volume of the fixing member main body is 3 times or more the volume of the cylindrical portion, and the fixing member main body and the cylindrical portion are connected to each other by an axis line of the rotor shaft. An insertion hole that penetrates in the direction is provided,
While the rotor shaft is inserted into the insertion hole, the cylindrical portion and the rotor shaft are fixed by welding at a part of the periphery of the opening end of the insertion hole ,
The shape of the inner corner portion of the opening end of the cylindrical portion is a thread chamfered shape of C0.1 or less,
The opening end of the insertion hole of the cylindrical portion and the rotor shaft are welded at a plurality of rotationally symmetric locations around the axis of the rotor shaft, and each melt-solidified portion formed by the welding is 90° around the axis. A motor-operated valve characterized by being formed over an angle range of not more than ° . The opening end portion of the insertion hole of the cylindrical portion and the rotor shaft are welded at two opposing locations around the axis of the rotor shaft,
The motor-operated valve according to claim 1, wherein each of the melted and solidified portions formed by the welding is formed within a range of 45° to 90° around the axis. The shape of the inner diameter corner of the open end of the cylindrical portion, in place of the yarn chamfered, claim 1 or, characterized in that <br/> which has an edge shape in contact with the outer periphery of the rotor shaft The motor operated valve described in 2 . Electric valve according to any one of claims 1 to 3, characterized in that said fixing member and said rotor shaft is made of the same material. Wherein a fixing member main body portion is cylindrical, the dimensions of the axial direction of the fixing member main body portion, any one of claims 1 to 4, characterized in that it is larger than the dimension of the axial direction of the cylindrical portion The motor-operated valve according to claim 1. When the diameter of the rotor shaft is D, the radial thickness of the cylindrical portion is t, and the axial dimension of the cylindrical portion is H,
t<D/2, H/t≧1
The motor-operated valve according to any one of claims 1 to 5 , wherein: The rotor shaft is located adjacent to a first shaft portion located on the side opposite to the valve member and an end portion of the first shaft portion on the valve member side, and is less than or equal to the length of the first shaft portion. And a second shaft portion having a length larger than that of the first shaft portion,
The cylindrical portion and the rotor shaft are fixed such that a surface of the fixing member on the valve member side is located at a boundary portion between the first shaft portion and the second shaft portion. The motor-operated valve according to any one of claims 1 to 6 . The magnet body includes a cylindrical magnet portion, and a disk portion that extends to a substantially central portion in the axial direction inside the magnet portion and has a boss portion protruding toward the valve member side provided at the center. Have,
The fixing member main body portion is coupled to the disc portion so as to extend in the axial direction from a surface of the disc portion opposite to the valve member to an end portion of the boss portion on the valve member side. The motorized valve according to any one of claims 1 to 7 , wherein the motorized valve is provided. A refrigeration cycle system including a compressor, a condenser, an expansion valve, and an evaporator, wherein the electrically operated valve according to any one of claims 1 to 8 is used as the expansion valve. A refrigeration cycle system characterized in that

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