JP2023115062A - Motor valve, and refrigeration cycle system including the same - Google Patents

Abstract

To provide a constitution of a motor valve capable of being assembled in a state that shaft centers of a housing case and a valve main body portion are aligned with high accuracy without requiring management of complicated assembly accuracy.SOLUTION: A motor valve 100 includes: a rotor shaft 131 fixed to a central axis CL of a magnetic rotor 141 and having a male screw portion 131a; a valve main body housing 111 provided with a valve chamber 111A, ports 111b, 111c, and a joining portion 111d; a female screw member 132 provided with a female screw portion 132b screw-connected to the male screw portion 131a; a metal fixture 133 formed into a plate shape and integrally fixed to the female screw member 132; and a cup-like housing case 151. An outer periphery of the metal fixture 133 is provided with a guide portion 133c formed along a virtual circle CI having a radius from the central axis CL to a farthermost part, and fitted to the inside of the housing case 151, and a welding portion 133d welded and fixed to the joining portion 111d of the valve main body housing 111 at a part excluding the guide portion 133c.SELECTED DRAWING: Figure 2

Description

TECHNICAL FIELD The present invention relates to an electrically operated valve and a refrigeration cycle system including the same.

2. Description of the Related Art An electrically operated valve used as an electrically operated expansion valve in a heat pump refrigeration cycle system is known, as shown in FIG. 1 of Patent Document 1, for example.

A motor-operated valve includes a stepping motor, a valve housing as a valve body, a valve mechanism, and a closed case as a storage case. The stepping motor includes a rotor shaft, a magnet rotor in a sealed case, and a stator coil arranged opposite the magnet rotor on the outer periphery of the sealed case. A male threaded portion of the rotor shaft is screwed into a female threaded portion of a support member of a valve mechanism portion, which will be described later. The valve housing has a valve chamber communicating with the first joint pipe and communicating with the second joint pipe via the valve port of the valve seat ring. The valve mechanism section has a support member, a valve holder, and a needle valve. The support member made of synthetic resin is fixed by welding to the upper end surface of the valve housing via a stainless steel flange as an insert-molded fixture. Further, the open end face of the lower portion of the sealing case is welded to the upper end face of the valve housing at a position separated from the outer peripheral portion of the flange portion with a predetermined gap.

In order for the rotor shaft and the magnet rotor to rotate smoothly when the stepping motor is operated, an appropriate gap must be formed between the inner peripheral surface of the sealed case and the outer peripheral surface of the magnet rotor, It is required that the central axis of the sealing case welded to the end faces is on the central axis of the valve housing.

JP 2018-115743 A

As disclosed in the above-mentioned Patent Document 1, on the upper end surface of the valve housing 1011, as shown in a partially enlarged view in FIG. The open end face of the lower portion of the sealing case 1051 is welded to a position separated from the outer peripheral portion of the portion 1033 with a predetermined gap Δg. In addition, in FIG. 8(a), illustration of the bead between the sealing case 1051 and the valve housing 1011 is omitted. The reason why the predetermined gap Δg is provided is that the opening end face of the lower portion of the sealing case 1051 and the upper end face of the valve housing 1011 are welded together, and the outer peripheral portion of the flange portion 1033 and the upper end face of the valve housing 1011 (circular This is to prevent the inner peripheral surface of the lower end of the sealing case 1051 from riding up on the formed bead (welding portion) 1033w after fillet welding to the annular joint portion 1011d). If the gap Δg as described above is not provided between the inner peripheral surface of the lower portion of the sealed case 1051 and the outer peripheral portion of the flange portion 1033, the partial gap shown in FIGS. As shown in an enlarged view, the inner peripheral surface of the lower end of the sealing case 1051' rides on the bead (weld build-up portion) 1033w', and as a result, the axial center of the sealing case 1051' is aligned with the valve housing 1011'. Along with the deviation from the axis, an axial gap Δg' is formed between the sealing case 1051' and the valve housing 1011'. Therefore, depending on the size of the gap Δg', there is a possibility that the open end surface of the lower portion of the sealing case 1051' cannot be welded to the upper end surface of the valve housing 1011'.

When such welding work is performed, sealing case 1051 and valve housing 1011 are positioned by a jig or the like in a welding machine so that the center axis of sealing case 1051 and the center axis of valve housing 1011 are on a common center axis. adjusted and maintained.

However, during the assembly process, the sealing case 1051 and the valve housing 1011 are placed on a common center axis so that the sealing case 1051 and the valve housing 1011 are aligned with each other in order to ensure high assembly accuracy. If it is necessary to adjust and hold the position with a jig or the like in the motor-operated valve, it becomes complicated to manage the assembly accuracy in the assembly work process of the motor-operated valve. Therefore, in assembling the sealing case 1051 and the valve housing 1011, it is desired that the axial centers of the sealing case 1051 and the valve housing 1011 be aligned with high accuracy and that the assembly can be performed by a simple welding operation.

In consideration of the above problems, the present invention provides a motor-operated valve and a refrigeration cycle system including the same, which eliminates the need for complicated management of assembly accuracy, and allows the housing case and the valve main body to be aligned with each other. It is an object of the present invention to provide a motor-operated valve having a structure that can be assembled by matching the centers with high precision, and a refrigeration cycle system including the same.

In order to achieve the above object, an electrically operated valve according to the present invention communicates with at least one connection port connected to a fluid pipeline, and controls opening and closing of a valve port of a valve seat provided in the connection port. a valve body housing having a valve chamber movably accommodating a valve body unit including a body, and a flow rate of fluid passing through the valve body unit between the end of the valve body and the periphery of the valve port of the valve seat an electromagnetic actuator comprising a rotor shaft and a magnet rotor for actuating a drive mechanism for controlling the movement of the valve body toward or away from the valve port of the valve seat so as to adjust the valve body unit; A female threaded member that guides and rotatably supports the rotor shaft; and an outer peripheral edge that protrudes from the outer peripheral portion of the female threaded member in a direction perpendicular to the central axis of the rotor shaft. A housing that houses a fixture that fixes the female threaded member by being welded to the periphery of the open end of the valve body housing into which the lower part is inserted, a rotor shaft and magnet rotor of the electromagnetic actuator, the female threaded member, and the fixture. a case, wherein the fixing bracket is formed on the outer peripheral edge so as to be concentric with the central axis of the housing case, and has a plurality of guide portions each having a contact surface that contacts the inner peripheral surface of the housing case; a weld portion formed between the guide portions inward in the central axis direction of the fixture from the contact surfaces of the guide portions, the weld portion being welded and fixed to the upper surface of the open end portion of the valve body housing; characterized by having

The contact surface of the guide portion is formed on the circumference of a common virtual circle centered on the central axis of the rotor shaft, and the diameter of the virtual circle is larger than the outer diameter of the magnet rotor. It may be set to be smaller than the inner diameter of the inner peripheral surface of the case.

On the abutment surface of the guide portion, at least a point of intersection between a line obtained by equally dividing the circumference of the central axis of the fixture into N equal angles (N=an integer of 3 or more) and the virtual circle may be located. .

At least one contact surface of the contact surfaces of the plurality of guide portions of the fixture may be an arcuate surface extending along the inner peripheral surface of the storage case. The weld may be welded and secured to the top surface of the open end of the valve body housing by a plurality of spot welds, a plurality of spaced apart fillet welds, or a continuous fillet weld.

Further, the motor-operated valve according to the present invention communicates with at least one connection port connected to a fluid pipeline, and includes a valve body that controls opening and closing of a valve port of a valve seat provided in the connection port. A valve body housing having a valve chamber movably housing the unit and a valve body unit are provided with a valve body to regulate the flow of fluid passing between the end of the valve body and the periphery of the valve port of the valve seat. An electromagnetic actuator including a rotor shaft and a magnet rotor for operating a drive mechanism that controls the movement of the valve body toward or away from the valve port on the seat, and an electromagnetic actuator that guides the valve body unit and rotates the rotor shaft. A valve body that has a female threaded member that can be supported, and an outer peripheral edge portion that protrudes from the outer peripheral portion of the female threaded member in a direction orthogonal to the central axis of the rotor shaft, is fixed to the female threaded member, and into which the lower part of the female threaded member is inserted. It comprises a stepped fixing metal fitting that fixes the female threaded member by being welded to the upper surface of the open end of the housing, a rotor shaft and magnet rotor of the electromagnetic actuator, a female threaded member, and a housing case that houses the fixing metal part. The edge stepped fixing fitting is formed concentrically with the central axis of the storage case and includes a guide portion having a contact surface that contacts the inner peripheral surface of the storage case, and an opening between the inner peripheral surface of the storage case and the valve body housing. A welded portion integrally formed with the guide portion at a lower position of the guide portion facing the portion surrounded by the upper surface of the end portion and the valve body housing closer to the central axis of the rotor shaft than the contact surface of the guide portion and a welding portion welded and fixed to the upper surface of the open end of the. The contact surface of the guide portion is formed on the circumference of a common virtual circle centered on the central axis of the rotor shaft, and the diameter of the virtual circle is larger than the outer diameter of the magnet rotor. It may be set to be smaller than the inner diameter of the inner peripheral surface of the case. When the edge stepped fixture has a plurality of guides, the contact surface of each guide has at least a line (N = an integer of 3 or more) that equally divides the circumference of the central axis of the fixture into N equal angles. and the intersection point where the virtual circle intersects.

Further, a refrigeration cycle system according to the present invention includes an evaporator, a compressor, and a condenser, and the above-described motor-operated valve is attached to a pipe arranged between the outlet of the condenser and the inlet of the evaporator. It is characterized by being provided.

According to the motor-operated valve and the refrigeration cycle system including the same according to the present invention, the fixture is formed on the outer peripheral edge so as to be concentric with the central axis of the housing case, and contacts the inner peripheral surface of the housing case. A plurality of guide portions each having an abutting surface, and a welded portion formed between the guide portions inwardly of the abutting surfaces of the guide portions in the central axis direction of the fixing fitting, wherein the open end of the valve body housing The welded portion is welded and fixed to the peripheral edge of the valve body. .

1 is a longitudinal sectional view showing a schematic configuration of a first embodiment of an electrically operated valve according to the present invention; FIG. FIG. 2(a) is a cross-sectional view taken along the line IIA-IIA shown in FIG. 1, showing the shape of the fixture, and FIG. 2(b) is the IIB portion of FIG. 2(a). Fig. 2(c) is an enlarged partial enlarged view, and Fig. 2(c) is a diagram for explaining a guide portion of the fixture shown in Fig. 2(a). FIG. 3(a) is a diagram showing a second embodiment of the fixture, FIG. 3(b) is a diagram showing a third embodiment of the fixture, and FIG. 3(c) is a diagram showing the fixture. It is a figure which shows 4th Example. FIG. 5 is a vertical cross-sectional view showing a schematic configuration of a second embodiment of an electrically operated valve according to the present invention; 5 is an enlarged cross-sectional view showing an enlarged V portion shown in FIG. 4; FIG. BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows an example of a structure of the refrigerating-cycle system using an example of the motor-operated valve which concerns on this invention. FIG. 5 is a diagram showing a modification of the fixture used in one example of the motor-operated valve according to the present invention; FIG. 8(a) is a partial cross-sectional view showing a partially enlarged joint structure of a sealing case, a valve body, and a fixing metal fitting of an electrically operated valve in the prior art document, and FIG. ) is a partial cross-sectional view of the sealing case, the valve body, and the fixture shown in FIG. FIG. 9(a) is a partially enlarged sectional view showing another example of the joining structure of the sealing case, the valve body, and the fixing bracket of the motor-operated valve in the prior art document, and FIG. It is an expanded sectional view which expands and shows the IXB part shown to Fig.9 (a).

FIG. 1 schematically shows the configuration of a first embodiment of an electrically operated valve according to the present invention together with a piping.

Note that the concept of up and down in the following description corresponds to, for example, up and down in FIG. 1 and indicates the relative positional relationship of each member, not the absolute positional relationship.

A motor-operated valve 100 as a first embodiment and a motor-operated valve 200 (see FIG. 4) as a second embodiment described later, for example, have an expansion valve 311 as shown in FIG. It is arranged between the outlet (first port 312a) of the outdoor heat exchanger 312 and the inlet (first port 315a) of the indoor heat exchanger 315 during cooling operation, which will be described later.

During cooling operation, the expansion valve 311 is connected to the primary pipe Du1 through a connection pipe (second joint 12), which will be described later, and is connected to the secondary pipe Du2 through a connection pipe (first joint 11). are spliced. The primary side pipe Du1 connects the outlet (first port 312a) of the outdoor heat exchanger 312 and the expansion valve 311, and the secondary side pipe Du2 connects the inlet (first port 315a) of the indoor heat exchanger 315. and the expansion valve 311 are connected. Between the outlet (second port 315b) of the indoor heat exchanger 315 and the inlet (second port 312b) of the outdoor heat exchanger 312, a pipe Du3 joined to the outlet of the indoor heat exchanger 315, A channel switching valve 313 and a pipe Du6 connected to the inlet of the outdoor heat exchanger 312 are provided. Further, the compressor 314 is joined to the flow path switching valve 313 by the pipes Du4 and Du5. The other end of the pipe Du3 is joined to the port 313 d of the channel switching valve 313 . The other end of the pipe Du6 is joined to the port 313b of the channel switching valve 313 . One end of the pipe Du4 is connected to the port 313c of the channel switching valve 313, and the other end of the pipe Du4 is connected to the discharge port of the compressor 314. One end of the pipe Du5 is connected to the port 313a of the channel switching valve 313, and the other end of the pipe Du5 is connected to the suction port of the compressor 314. During cooling operation, the ports 313a and 313d communicate, and the ports 313b and 313c communicate. As a result, during cooling operation, the refrigerant in the refrigeration cycle system is circulated, for example, along the direction indicated by the dashed arrow shown in FIG. It will function as a vessel. Note that, during the cooling operation, the expansion valve 311 is connected to the primary side pipe Du1 by the second joint 12, and is connected to the secondary side pipe Du2 by the first joint 11. For example, during cooling operation, the expansion valve 311 is joined to the primary side pipe Du1 by the first joint 11 and joined to the secondary side pipe Du2 by the second joint 12. may

On the other hand, during the heating operation, the flow path switching valve 313 is switched so that the ports 313a and 313b of the flow path switching valve 314 communicate and the ports 313c and 313d communicate. As a result, during heating operation, the refrigerant in the refrigeration cycle system is circulated, for example, along the direction indicated by the solid line arrows shown in FIG. It will function as a vessel. The compressor 314 and the expansion valve 311 are driven and controlled by a control unit (not shown), and the flow path switching valve 313 is switch-controlled.

As shown in FIG. 1, the motor-operated valve 100 includes a valve drive section that is arranged in a cylindrical storage case 151 that constitutes a part of an exterior section 150 that will be described later, and that drives a valve body unit that will be described later so that it can move up and down. a valve body portion 110 having a valve seat 112 having a valve port 112a which is connected to the lower end of a housing case 151 and opened and closed by a tip portion of a needle 121 serving as a valve body; and a valve body unit including a needle 121 for opening and closing the valve port 112a.

The valve driving section has a rotor shaft 131 for moving up and down a valve body unit, which will be described later, and a female threaded portion 132b formed with a female thread that is concentrically fitted with a male threaded portion 131a of the rotor shaft 131. A female screw member 132 as a guide support portion that is fixed and guides the valve body unit so as to be able to move up and down; A stator coil (not shown) arranged on the outer periphery of the case 151 and rotating the magnet rotor 141 is included as a main element. The magnet rotor 141 and stator coil constitute a part of a stepping motor as an electromagnetic actuator.

The rotor shaft 131 and the female threaded member 132 form part of a rotor shaft rotating portion 130, which will be described later. Also, the magnet rotor 141 and the stator coil constitute a part of a rotor shaft driving section 140, which will be described later.

The valve main body housing 111 of the valve main body portion 110 is formed, for example, by processing a metal material such as a stainless steel plate into a cylindrical shape by press working or the like. The valve body housing 111 has a lower end portion (overhanging portion 132B) of the female screw member 132, the other end of the needle 121 supported concentrically with the rotor shaft 131 described later, and a cylindrical needle case 125 inside. has a valve chamber 111A that is housed in the The other end of the needle 121 protrudes into the valve chamber 111A toward the valve port 112a. Further, the valve chamber 111A includes a first port 111b to which one end of the first joint 11 as a first passage is connected on an axis substantially perpendicular to the central axis of the needle 121, and the central axis of the needle 121. and a valve seat 112 having a valve port 112a adjacent to a second port 111c to which one end of a second joint 12 as a second passage on a common axis is connected.

A ring-shaped joint portion 111d is formed on the peripheral edge of the circular opening end of the upper portion of the valve body housing 111 to be joined to the lower end portion of a storage case 151, which will be described later. .

Here, the first joint 11 and the second joint 12 are both made of copper or stainless steel, and are fixed to the valve body housing 111 by brazing, welding, or the like. It is not limited. In addition, in the motor operated valve of the present embodiment, the description will be made assuming that the refrigerant flows through the first port 111b on the inflow side and the second port 111c on the outflow side. The motor-operated valve 100 is a bidirectional motor-operated valve that can use the first port 111b as an outflow side and the second port 111c as an inflow side.

The valve seat 112 is made of, for example, a metal material such as stainless steel or copper alloy, and is fixed by welding, brazing, or the like around the second port 111c to which the second joint 12 of the valve body housing 111 is connected. be. The flow rate of the refrigerant passing through the valve port 112a is controlled by arranging the needle 121 together with the needle case 125 so as to be close to or separate from the valve port 112a. Although the valve seat 112 is a separate member from the valve body housing 111 here, it may be molded integrally with the valve body housing 111 .

The valve body unit 120 includes a needle 121 that opens and closes the valve port 112a of the valve seat 112, a flange portion 131b of the rotor shaft 131, and a washer 124 made of resin. and the spring engaging portion 123a of the spring retainer 123 and the annular flat portion for the spring retainer at one end of the needle 121. It is composed mainly of a biasing valve spring 122 , a spring bearing 123 , the valve spring 122 , and a cylindrical needle case 125 that houses one end of the needle 121 .

The needle 121 is made of, for example, a metal material such as stainless steel. The needle 121 is vertically moved along the center axis CL by a rotor shaft 131 and the like, which will be described later. This controls the flow rate of refrigerant passing through the valve port 112a. The side of the needle 121 that is close to the valve port 112a is formed into a shape in which the center protrudes gently. Such a protruding shape is formed so that the effective opening area increases or decreases depending on the position of the needle 121 by controlling the position of the needle 121 with respect to the valve port 112a.

A valve spring 122 arranged inside a substantially cylindrical needle case 125 is compressed between the needle 121 and a spring engaging portion 123a of a spring bearing 123, which will be described later. By providing the valve spring 122, there is an effect of preventing a screw thrust from a rotor shaft 131, which will be described later, from being directly applied to the needle 121, the valve port 112a, and the like. As a result, the durability of the electric valve 100 is enhanced. effective.

The spring receiver 123 is made of, for example, resin and has a substantially cylindrical shape. The spring bearing 123 is arranged inside the valve spring 122 along the center axis CL between the needle 121 and a flange portion 131b of the rotor shaft 131 (to be described later) inside the needle case 125 . A disk-shaped spring engaging portion 123a projecting radially outward is formed at the end of the spring bearing 123 on the side that contacts the rotor shaft 131 . By arranging the spring bearing 123 inside the valve spring 122 along the central axis CL, the concentricity between the valve spring 122 and the spring bearing 123 is enhanced, and the operability of the valve body unit 120 is improved. There is

The washer 124 is made of, for example, a highly lubricious resin or the like and is formed in an annular shape. The washer 124 is arranged between a flange portion 131b of the rotor shaft 131, which will be described later, and an open end portion 125a of the needle case 125, which will be described later. By providing the washer 124 , it is possible to suppress direct transmission of the rotation of the rotor shaft 131 to the needle 121 . As a result, the rotation of the needle 121 is suppressed, and the wear between the needle 121 and the valve port 112a of the valve seat 112 is prevented.

The needle case 125 is made of a metal material such as stainless steel, and is formed into a substantially cylindrical shape by press working or the like. An open end 125a is formed at the end of the needle case 125 on the rotor shaft 131 side. The needle case 125 has a function of transmitting a screw driving force of a rotor shaft 131 and the like to the needle 121, which will be described later. The open end 125a of the needle case 125 is arranged to engage with the flange 131b of the rotor shaft 131 facing each other. The needle 121 is fixed by welding or the like to the end of the needle case 125 opposite to the open end 125a.

The rotor shaft driving section 140 includes a magnet rotor 141 , a rotor fixing member 142 , a rotation stopper spring 143 and a movable stopper member 144 .

The magnet rotor 141 is housed in a rotor chamber 141A inside a housing case 151, which will be described later, and is composed of multipolar permanent magnets formed of a ferrite sintered body or the like and having north and south poles alternately arranged. In this embodiment, the magnet rotor 141 is arranged on the outer circumference of a housing case 151, which will be described later, and constitutes a stepping motor together with a stator coil including a yoke, a bobbin, and a coil (not shown). Although a stepping motor is used here, it is not limited to this, and similar effects can be obtained by using other electric motors capable of rotationally driving the magnet rotor 141 .

The magnet rotor 141 is supported by the rotor shaft 131 via a rotor fixing member 142 . A rotor fixing member 142 having a hole into which the rotor shaft 131 is inserted is provided around the central axis of the rotor shaft 131 . The rotor fixing member 142 is press-fitted into the mounting hole of the magnet rotor 141 .

The rotation stopper spring 143 has a coil spring shape and is wound around a cylindrical portion 152b of the rotor support member 152, which will be described later. The upper end and lower end of the rotation stopper spring 143 are respectively locked to the cylindrical portion 152b.

The movable stopper member 144 has a coil spring shape of about one turn, and is rotatably arranged around the cylindrical portion 152 b of the rotor support member 152 . One end of the movable stopper member 144 is engaged with an engaging protrusion 141b formed integrally with a predetermined pole of the magnet rotor 141 having multiple poles, and the other end is engaged with the rotation stopper spring 143. screwed together. As the magnet rotor 141 rotates, the movable stopper member 144 moves up and down while rotating around the cylindrical portion 152b. With such a configuration, the rotation stopper spring 143 is arranged with respect to the center axis CL of the electrically operated valve 100 without rattling.

The exterior part 150 includes a housing case 151 , a rotor support member 152 and a tubular member 153 .

The storage case 151 is made of a non-magnetic metal material such as a stainless steel plate, and is formed into a cup shape by pressing or the like. The containing case 151 has an outer diameter substantially the same as the outer diameter of the valve body housing 111 described above. The circular lower end of the housing case 151 is fixed to the circular upper end of the valve body housing 111 by, for example, TIG welding, plasma welding, laser welding, resistance welding, or the like, by butt-welding the entire circumference. be. As a result, the inside of the housing case 151 is sealed. Further, the storage case 151 is formed with a dimple 151a for engaging with an engaging recess 152c formed in a cup-shaped portion 152a of the rotor support member 152, which will be described later.

The rotor support member 152 is made of a material such as a stainless steel plate, and is formed by press working or the like. The rotor support member 152 is composed of a cup-shaped portion 152a fixed in contact with the housing case 151, and a cylindrical portion 152b extending downward from the center of the cup-shaped portion 152a. An engagement recess 152c is formed in the cup-shaped portion 152a. The rotor support member 152 is fixed at a predetermined mounting position of the housing case 151 by the engagement between the engaging recess 152c and the dimple 151a of the housing case 151. As shown in FIG.

The cylindrical member 153 is made of metal or synthetic resin, and is made of a highly lubricating material. The tubular member 153 is arranged inside the cylindrical portion 152b of the rotor support member 152, and rotatably holds the upper end portion (guide shaft portion) of the rotor shaft 131. As shown in FIG.

The rotor shaft rotating portion 130 includes a rotor shaft 131 , a female screw member 132 and a fixing metal fitting 133 .

The rotor shaft 131 is made of, for example, a metal material, has a generally cylindrical shape, and extends vertically along the central axis CL of the electrically operated valve 100 . A magnet rotor 141 rotated by an electric motor such as a stepping motor, which will be described later, is fixed around the axial center of the rotor shaft 131 via a rotor fixing member 142, which will be described later. As a result, the rotor shaft 131 rotates around the center axis CL together with the magnet rotor 141 .

A male threaded portion 131 a is formed on a portion of the rotor shaft 131 closer to the needle 121 than the rotor fixing member 142 . The male threaded portion 131a is screwed into a female threaded portion 132b of a female threaded member 132, which will be described later. Further, at the end of the rotor shaft 131 closer to the needle 121 than the externally threaded portion 131a, a disc-shaped flange portion 131b is formed that protrudes radially outward. The flange portion 131b is arranged at a position separated from the inner peripheral surface of the open end portion 125a of the needle case 125. As shown in FIG. The diameter of the flange portion 131b is larger than the diameter of the hole of the open end portion 125a, and serves as a retainer.

The female threaded member 132 is made of, for example, resin and has a substantially cylindrical shape. An upper portion of the female threaded member 132 is formed with a female threaded portion 132b that is fitted to the male threaded portion 131a of the rotor shaft 131 . The female threaded portion 132b is formed concentrically with the central axis CL of the electrically operated valve 100. As shown in FIG. The female screw member 132 constitutes a part of a screw feed mechanism that converts the rotational motion of the magnet rotor 141 into linear motion in the direction of the central axis CL of the rotor shaft 131 by screwing with the rotor shaft 131 .

A guide chamber 132A that slidably accommodates the needle case 125 together with the needle 121 is formed in a portion of the female thread member 132 below the female thread portion 132b. The inner peripheral surface of the female screw member 132 forming the guide chamber 132A serves as a guide surface that movably guides the outer peripheral surface of the cylindrical needle case 125. As shown in FIG. A part of the inner peripheral surface forming the guide chamber 132A is provided with a pressure equalizing hole 132c penetrating to the outside. As a result, the guide chamber 132A and the rotor chamber 141A are communicated with each other, and the movement of the rotor shaft 131 and the needle case 125 is facilitated. A projecting portion 132B that is inserted into the opening end of the valve body housing 111 is formed at the end portion of the female screw member 132 below the portion where the pressure equalizing hole 132c is formed. A fixing bracket 133 is fixed to the projecting portion 132B by insert molding. At that time, the fixing bracket 133 is fixed concentrically with the central axis of the female screw member 132 .

The fixture 133 is, for example, a disk-shaped member made of metal, as shown in FIG. 2(a). A circular arc surface or a slant surface of a concave portion 133b on an outer peripheral portion of the fixing metal fitting 133, which will be described later, is fixed to an annular joint portion 111d of the valve body housing 111 by welding or the like. As a result, the female screw member 132 is fixed to the valve body housing 111 via the fixing bracket 133 . At that time, the female screw member 132 is fixed concentrically with the central axis of the valve body housing 111 .

In the motor operated valve 100 according to the first embodiment of the present invention described above, in order to solve the conventional problems, the mounting case 151 and the female screw member 132 can be Structures are provided to automatically maintain coaxiality. The structure will be described below with reference to FIGS. 2(a) and 2(b).

FIG. 2(a) is a cross-sectional view taken along the line IIA-IIA shown in FIG. 1 and shows the shape of the fixture 133, and FIG. 2(b) is the IIB portion of FIG. 2(a). FIG. 2(c) is a diagram illustrating a guide portion 133c (hereinafter, also referred to as a projection 133a) of the fixture 133 shown in FIG. 2(a).

As shown in FIGS. 2(a) and 2(b), the fixture 133 as the first embodiment is, for example, a substantially disc-shaped member made of metal, and has a disc-shaped outer periphery. Four convex portions 133a are provided along the . Each convex portion 133 a has a contact surface projecting radially so as to contact the inner peripheral surface of the storage case 151 . The shape of the four projections 133 a is generally arc-shaped so that the tip thereof abuts against the inner peripheral surface 151 b of the cup-shaped storage case 151 . In addition, the contact surface is not limited to only surface contact, and for example, a part of the contact surface may be configured to be in line contact or point contact.

The four projections 133a are formed at equal angular (90°) intervals along the circumferential direction of the fixture 133 . Further, each convex portion 133a is formed to have the same width W along the circumferential direction. Four concave portions 133b are formed between the continuous convex portions 133a and the convex portions 133a. The concave portion 133b is formed of an arcuate portion extending in the circumferential direction of the fixture 133, and sloping portions that extend from both ends of the arcuate portion and reach the contact surface of the guide portion 133c. The curvature radius of the outer peripheral surface forming the arc portion of the concave portion 133b is set smaller than the curvature radius of the contact surface forming the convex portion 133a.

Here, it is assumed that the concave portions 133b are provided in portions other than the convex portions 133a on the outer periphery between the plurality of convex portions 133a.

In this case, the recessed portion 133b is formed of an arcuate surface portion extending in the circumferential direction of the fixture 133 and sloping surfaces extending from both ends of the arcuate surface portion and reaching the contact surface of the guide portion 133c. For example, in the recess 133b, if all of the arc surface portions are fillet welded and the slanted surface portions are not welded, the welded arc surface portions form the welded portion 133d. Further, for example, when the arc surface portion is welded at predetermined intervals by a plurality of spot welding and the slope portion is not welded, each spot welded portion forms the welded portion 133d. Furthermore, if only the two slanted surfaces are spot welded or fillet welded and the arc surface is not welded, the spot welded or fillet welded portion forms the welded portion 133d. A non-welded arc surface portion or slope portion, in other words, an arc surface portion or slope portion that does not need to be welded, may be a welding range as shown in FIG. 2(b).

In this example, all the contact surfaces of the four convex portions 133a are in contact with the inner peripheral surface 151b of the housing case 151, but this need not necessarily be the case. The entire contact surface of the portion 133 a (guide portion 133 c ) does not have to contact the inner peripheral surface 151 b of the storage case 151 .

The guide portion 133c (convex portion 133a) will be described in more detail with reference to FIGS. 2(a) and 2(c). The contact surface of each guide portion 133c is formed on the circumference of a common imaginary circle CI centered on the central axis CL of the rotor shaft 131. As shown in FIG. The radius of the virtual circle CI is set, for example, to the length from the center axis CL of the fixing metal fitting 133 concentric with the rotor shaft 131 to the furthest part. As a result, the fixing bracket 133 is fitted into the inner peripheral surface 151b of the storage case 151 during assembly. The guide portion 133c adjusts the coaxiality (coaxiality, concentricity) between the housing case 151 and the female screw member 132 to the extent that interference between the inner peripheral surface 151b of the housing case 151 and the rotating magnet rotor 141 can be prevented. ) should be maintained. Therefore, the diameter of the virtual circle CI of the contact surface of the guide portion 133c is set to be larger than the outer diameter of the magnet rotor 141 and smaller than the inner diameter of the inner peripheral surface 151b of the housing case 151. (outer diameter of magnet rotor 141<diameter of imaginary circle CI<inner diameter of storage case 151). Further, as shown in FIG. 2(c), on the contact surface of the guide portion 133c that contacts the inner peripheral surface 151b of the storage case 151, the circumference of the central axis CL of the fixing metal fitting 133 is divided into four equal angles. A point of intersection between the line and the virtual circle CI is preferably located. In addition, although it is divided into four equal parts here, it is not limited to this, and if it is divided into N equal parts (N is an integer of 3 or more), the above-mentioned coaxiality can be maintained.

When the arc surfaces or slopes of the four recesses 133b and the joint portion 111d of the valve body housing 111 are welded and fixed, they may be welded and fixed at a weld portion 133d, which will be described later, in a portion other than the guide portion 133c. . As described above, the recessed portion 133b is formed of an arcuate portion extending in the circumferential direction of the fixture 133 and sloped portions that extend from both ends of the arcuate portion and reach the contact surface of the guide portion 133c. For example, as shown in FIG. 2B, the welded The arc surface portion or the slope portion is the welded portion 133d. As a result, the bead formed in the welded portion 133d is not outside the virtual circle CI, but is formed inside the virtual circle CI. do not have.

Note that the welded portion 133d cannot be provided inside the inner diameter of the ring-shaped joint portion 111d of the valve body housing 111 indicated by the dashed line in FIG. 2(a). This is because the fixing bracket 133 and the valve body housing 111 cannot come into contact with each other and cannot be fixed by welding.

In assembling the above-described electrically operated valve 100 in such a configuration, first, the rotor shaft 131 assembled together, the needle case 125 to which the needle 121 is fixed, etc. are attached to the female thread member 132, and then the , the protruding portion 132B of the female screw member 132 is inserted into the open end of the valve body housing 111, and the fixing bracket 133 is placed on the periphery of the open end of the valve body housing 111 to which the valve seat 112 and the like are previously attached. be. Subsequently, for example, the arcuate surface portion of the recess 133b of the fixture 133 and the peripheral edge of the open end of the valve body housing 111 are fixed by fillet welding using a first welder (not shown). As a result, a first bead is formed between the welded portion 133d, which is a welded circular arc surface portion, and the joint portion 111d of the valve body housing 111. As shown in FIG.

The radial gap between the projecting portion 132B of the female thread member 132 and the open end portion of the valve body housing 111 may be set to be a clearance fit or an interference fit, for example.

Subsequently, after the magnet rotor 141 is attached to the rotor shaft 131, the valve body housing 111 described above is removed from the first welder, and the assembled valve body housing 111 is placed on the support base of the second welder ( (not shown), the inner peripheral surface 151b of the housing case 151 to which the rotor support member 152 and the like are attached is located at the opening end of the valve body housing 111 to which the welded portion 133d of the fixing bracket 133 is fixed. The lower end of the housing case 151 is placed on the periphery of the opening end of the valve body housing 111 without gaps so as to contact the contact surface of the guide portion 133c of the fixing metal fitting 133 at the periphery. As a result, the axial center of the housing case 151 and the axial centers of the rotor shaft 131 and the female screw member 132 are automatically aligned.

Then, on the support base of the second welder, the accommodating case 151 and the valve body housing 111, which have substantially the same outer diameter, are gripped as a whole, so that the axes of the accommodating case 151 and the valve body housing 111 are aligned. Welding work is performed on the lower end surface of the containing case 151 and the joint portion 111d of the valve body housing 111 in a state where they are aligned with each other. As a result, a second bead is formed between the lower end surface of the housing case 151 and the joint portion 111d of the valve body housing 111 adjacent to the first bead.

In this way, by providing a plurality of guide portions 133c (projections 133a) and a plurality of recesses 133b on the disk-shaped outer periphery of the fixing bracket 133, the guide portions 133c are arranged on the inner peripheral surface 151b of the housing case 151. The fixing bracket 133 and the valve body housing 111 can be welded and fixed at the welded portion 133d formed in the recessed portion 133b, which is not in contact with the inner peripheral surface 151b of the housing case 151. The welded portion 133d Since the formed weld bead does not interfere with the inner peripheral surface 151b of the housing case 151, the valve body housing 111 and the housing case 151 can be brought into contact with each other without gaps and fixed while maintaining coaxiality.

In the above example, it is not necessary for the contact surfaces of all the guide portions 133c to contact the inner surface of the housing case 151. The end of the containing case 151 and the end of the valve body housing 111 may be brought into close contact with each other to maintain coaxiality between the fixing bracket 133 and the containing case 151 . This is because the abutment surface of the guide portion 133c prevents the magnet rotor 141 from coming into contact with the inner peripheral surface 151b of the accommodation case 151 when the magnet rotor 141 rotates. This is because it serves as a mechanical stopper to prevent the storage case 151 from slipping out of the range.

Here, four convex portions 133a (guide portions 133c) formed on the fixing bracket 133 are provided. It suffices if they are provided at a plurality of locations. Second to fourth embodiments (modifications) of the fixture will be described below with reference to FIGS. 3(a) to 3(c).

FIG. 3(a) is a diagram showing another example of the shape of the fixture, FIG. 3(b) is a diagram showing still another example of the shape of the fixture, and FIG. FIG. 8 is a diagram showing still another example of the shape of the fixture;

As shown in FIG. 3A, the fixture 133A as the second embodiment has three protrusions 133Aa (hereinafter also referred to as guide portions 133Ac), a protrusion 133Aa on the circumference and a protrusion 133Aa. Three recessed portions 133Ab are formed between the . The three protrusions 133Aa are formed at equal angular intervals, for example, at intervals of 120°. The width W of each convex portion 133Aa along the circumferential direction is set to be the same as each other. In addition, the concave portions 133Ab are formed at equal angular intervals, for example, at intervals of 120°. The lengths of the circular arc surface portions forming the concave portion 133Ab along the circumferential direction are set to be the same as each other. Further, as shown in FIG. 3A, the contact surface of the guide portion 133Ac that contacts the inner peripheral surface of the housing case 151 is aligned with a line that divides the circumference of the center axis CL of the fixing bracket 133A into three equal angles. , and a virtual circle (a common circle similar to the virtual circle shown in FIG. 2(c) in which the above-described abutment surfaces exist). This satisfies the condition for maintaining coaxiality described above.

In this case, the recessed portion 133Ab is formed of an arcuate surface portion extending in the circumferential direction of the fixing fitting 133, and sloping surfaces extending from both ends of the arcuate surface portion and reaching the contact surface of the guide portion 133Aa. In the recessed portion 133Ab, for example, when all the arc surface portions are fillet welded and the slope portion is not welded, the welded arc surface portions form the welded portion 133Ad.

Further, as shown in FIG. 3(b), the fixing metal fitting 133B as the third embodiment has a protrusion 133Ba1 (hereinafter also referred to as a guide portion 133Bc) having a narrow width W and a width of about 120 along the circumferential direction. A convex portion 133Ba2 formed of an arcuate surface portion having a central angle of ° is provided at a position facing each other. Between the two protrusions 133Ba1 and 133Ba2, there are formed two recesses 133Bb each including an arcuate surface formed along the circumferential direction. The circumferential lengths (surface areas) of the contact surfaces of the two convex portions 133Ba1 and the contact surface of the convex portion 133Ba2 are different from each other and are not uniform. Further, as shown in FIG. 3B, the contact surface of the guide portion 133Bc that contacts the inner peripheral surface 151b of the housing case 151 is defined by a line that divides the circumference of the center axis CL of the fixing metal fitting 133B into three equal angles. and a virtual circle (a common circle similar to the virtual circle shown in FIG. 2(c) in which the contact surfaces described above exist). This satisfies the condition for maintaining coaxiality described above.

In this case, the recessed portion 133Bb is formed of an arcuate surface portion extending in the circumferential direction of the fixture 133 and sloping surfaces extending from both ends of the arcuate surface portion and reaching the contact surface of the guide portion 133Bc. In the recess 133Bb, for example, if all the arc surface portions are fillet welded and the slope portion is not welded, the welded arc surface portions form the welded portion 133Bd.

Furthermore, as shown in FIG. 3(c), the rest of the fixing metal fitting 133C as the fourth embodiment other than the two convex portions 133Ca (hereinafter also referred to as guide portions 133Cc) formed facing each other has two Concave portions 133Cb are formed to face each other. The contact surfaces of the two protrusions 133Ca are formed by circular arc surfaces having the same central angle. The outer peripheral surfaces forming the two recesses 133Cb are formed of curved surfaces having the same shape. In addition, as shown in FIG. 3C, the contact surface of the guide portion 133Cc that contacts the inner peripheral surface 151b of the housing case 151 is defined by a line that divides the circumference of the center axis CL of the fixing metal fitting 133C into four equal angles. and the virtual circle. This satisfies the condition for maintaining coaxiality.

In this case, the recessed portion 133Cb is formed of a curved surface portion extending in the circumferential direction of the fixing member 133, and sloping surfaces extending from both ends of the curved surface portion and reaching the contact surface of the guide portion 133Ca. In the concave portion 133Cb, for example, if all the curved surface portions are fillet welded and the slope portion is not welded, the welded curved surface portion forms the welded portion 133Cd.

The fixing metal fittings 133 shown in FIG. As in the case, the valve body housing 111 and the storage case 151 are in contact with each other without gaps, and the coaxiality is maintained.

As described above, according to the motor-operated valve 100 of the first embodiment of the present invention, along the outer circumference of the fixture 133, a plurality of guide portions 133c and a plurality of welded portions 133d are provided, thereby Interference between the weld bead and the storage case 151 that may occur can be prevented, and the valve body housing 111 and the storage case 151 can be brought into contact with each other without gaps and fixed while maintaining coaxiality, thereby reducing manufacturing management. can be made possible.

The operation of the electrically operated valve 100 configured in this way will be described.

When driving the motor-operated valve 100, first, a driving pulse signal is applied to the stator. As a result, the magnet rotor 141 rotates according to the number of pulses, and the rotor shaft 131 rotates accordingly. rotates and moves along the central axis CL.

When the electric valve 100 is to be closed, it is necessary to move the rotor shaft 131 downward. After the needle 121 abuts against the valve seat 112, when the rotor shaft 131 moves further downward, the valve spring 122 contracts via the spring bearing 123, and the needle 121 is moved by the load caused by the reaction force of the valve spring 122. Pressed against the seat 112, the electrically operated valve 100 is controlled to a positive closed state.

At this time, the needle 121 is pressed against the valve seat 112 via the spring bearing 123 and the valve spring 122, so that the frictional resistance of the seating surface is greater than the frictional resistance between the rotor shaft 131 and the highly slippery spring bearing 123. Since the rotating rotor shaft 131 slides on the spring bearing 123, transmission of rotation to the needle case 125 and the needle 121 is suppressed. This suppresses wear of the needle 121 and the valve port 112a. Further, since the rotor shaft 131 is pushed in, the washer 124 descends together with the flange portion 131 b of the rotor shaft 131 . It also stops spinning.

Subsequently, when returning the electric valve 100 from the valve closed state to the valve open state, it is necessary to reversely rotate the rotor shaft 131 to move it upward. As the rotor shaft 131 rises, the valve spring 122 expands via the spring bearing 123 . At this time, the needle 121 is kept in contact with the valve seat 112 . When the rotor shaft 131 further moves upward, the flange portion 131b of the rotor shaft 131 contacts the inner surface of the open end portion 125a of the needle case 125 via the washer 124, and lifts the needle case 125 while rotating. When the needle case 125 is lifted, the needle 121 fixed thereto also moves upward, the needle 121 and the valve port 112a of the valve seat 112 are out of contact, and the electric valve 100 is controlled to the valve open state.

At this time, the needle case 125 and the needle 121 are driven by the rotor shaft 131 via the washer 124 with high lubricity. be. This suppresses wear of the needle 121 and the valve port 112a.

Next, a second embodiment of an electrically operated valve according to the present invention will be described.

FIG. 4 schematically shows the configuration of a second embodiment of the motor-operated valve according to the present invention together with a piping pipe. FIG. 5 is an enlarged cross-sectional view showing an enlarged portion V shown in FIG.

As shown in FIGS. 4 and 5, the configuration of the motor-operated valve 200 differs from the configuration of the motor-operated valve 100 having the fixing bracket 133 in that it includes the stepped fixing bracket 233 insert-molded into the female thread member 233 . More specifically, the outer peripheral portion of the substantially disk-shaped edge stepped fixing bracket 233 made of metal has a contact surface that contacts the inner peripheral surface 151b of the housing case 151, and has an outwardly protruding convex shape. A stepped portion composed of a portion 233a (hereinafter also referred to as a guide portion 233c) and a recessed portion 233b forming a gap in a portion surrounded by the inner peripheral surface 151b of the housing case 151 and the upper end surface of the valve body housing 111. have. A portion (joint portion 111d) of the upper end surface of the valve body housing 111 forming the recess 233b and a portion of the lower end portion of the edge stepped fixing bracket 233 supported by the upper end surface of the valve body housing 111 are shown in FIG. As shown, weld 233d will be formed.

The rest of the configuration of the motor-operated valve 200 is the same as the configuration of the above-described motor-operated valve 100, so the same constituent elements are denoted by the same reference numerals, and redundant description thereof will be omitted.

As shown in FIGS. 4 and 5 , the stepped portion of the edge stepped fixing fitting 233 is formed in the thickness direction along the center axis CL of the electrically operated valve 200 . The concave portion 233b, which is a portion near the center axis CL, is formed on the valve body housing 111 side, which is the lower side of the fixing metal fitting 233, because the lower end surface of the fixing metal fitting 233 is fillet-welded to the joint portion 111d of the valve body housing 111. be done. Further, the contact surface of the guide portion 233c, which is a portion farther from the central axis CL than the recess 233b, contacts the inner peripheral surface 151b of the housing case 151, so that it is formed on the side of the housing case 151 above the fixing bracket 233. .

It should be noted that the entire contact surface of the convex portion 233a does not necessarily need to contact the inner peripheral surface 151b of the storage case 151 here.

As for the condition of the guide portion 233c, the edge stepped fixture 233 is accommodated so that the contact surface of the guide portion 233c contacts the inner peripheral surface 151b of the accommodation case 151, as in the first embodiment. It is fitted into the inner peripheral surface 151 b of the case 151 . If the guide portion 233c can maintain coaxiality (coaxiality, concentricity) between the storage case 151 and the valve body housing 111 to the extent that interference between the inner peripheral surface of the storage case 151 and the rotating magnet rotor 141 can be prevented. good. For this reason, the diameter of the contact surface of the guide portion 233c is set to be larger than the outer diameter of the magnet rotor 141 and smaller than the inner diameter of the inner peripheral surface 151b of the housing case 151 (the magnet rotor 141 <diameter of contact surface<inner diameter of storage case 151).

Further, here, the lower end portion forming part of the concave portion 233b, which is the portion other than the guide portion 233c described above, and the joint portion 111d of the valve body housing 111 are fixed by welding. As a result, a welded portion 233 d is formed by the joint portion 111 d of the valve body housing 111 and the lower end portion forming the concave portion 233 b of the edge stepped fixture 233 .

In addition, it is not necessary to weld all of the recesses 233b to the welded portions 233d, and a part of the recesses 233b may be welded, or welded and fixed by a plurality of spot welds or a plurality of point-like fillet welds. may be

Note that the welded portion 233d cannot be provided inside the inner diameter of the ring-shaped joint portion 111d of the valve body housing 111 . This is because the fixing bracket 233 and the valve body housing 111 cannot come into contact with each other and cannot be fixed by welding. Furthermore, the welded portion 233 d must be formed at a position where the weld bead 233 w generated by welding with the valve body housing 111 does not interfere with the storage case 151 .

Also, the convex portion 233a may be provided continuously around the entire circumference, or the convex portion 233a may be interrupted into a plurality of parts instead of being continuous around the entire circumference. In such a case, the abutment surface of the guide portion 233c includes at least a line obtained by equally dividing the circumference of the central axis of the fixture into N equal angles (N=an integer of 3 or more), and a line shown in FIG. It is assumed that the point of intersection between a virtual circle that is similar to the virtual circle that is

However, when the convex portion 233a is provided on the entire circumference, the convex portion 233a becomes circular, which facilitates manufacturing, so that the manufacturing man-hours can be reduced.

Furthermore, this embodiment can also be taken as the following forms, and such forms are also within the scope of the present invention. For example, a disk serving as a guide portion is formed on the side of the housing case 151 in the edge stepped fixing fitting, and a small disk with a smaller diameter than this disk is coaxially integrated with a large disk on the valve body housing 111 side. The small disc is formed with a weld.

As described above, the electrically operated valve 200 of the second embodiment of the present invention also has the same effect as the first embodiment, and also has the effect of reducing the manufacturing man-hours.

In the present invention, the valve body housing 111 and the fixing bracket 133 to be welded have been described as being made of metal material, but are not limited to this, and may be made of, for example, a weldable thermoplastic resin or the like. may be Moreover, although the fixing metal fittings 133 and 233 have been described as having a disc shape, the fixing metal fittings 133 and 233 are not limited to this, and as shown in FIG. can also be used.

As described above, according to the present invention, in order to solve the above-described conventional problems, coaxiality can be maintained when fixing the valve body housing and the containing case with a simple structure of parts. It is possible to provide a motor-operated valve and a refrigeration cycle system including the same, which can reduce manufacturing management.

CL center axis 11 first joint 12 second joint 100, 200 electric valve 110 valve body 111 valve body housing 111A valve chamber 111b first port 111c second port 111d joint 112 valve seat 112a valve port 120 needle Department 121 Needle 122 Between 123 Arena 123A Burner 125 Washer 125 Needle Case 125A Opening End 130, 230 Rotor Axis Rotating Club 131 Rotor Axis 131a Screw 131a Frange Club 132, 232 Female Screw Parts 132A, 232A Guide Room 132B , 232b Female screw portion 132c, 232c Pressure equalizing hole 133, 133A, 133B, 133C, 233 Fixing bracket 133a, 133Aa, 133Ba1, 133Ba1, 133Ca, 233a Convex portion 133b, 133Ab, 133Bb, 133Cb, 233b Concave portion 13 3c, 133Ac, 133Bc, 133Cc, 233c guide portion 133d, 133Ad, 133Bd, 133Cd, 233d welding portion 140 rotor shaft driving portion 141 magnet rotor 141A rotor chamber 141b engaging projection portion 142 rotor fixing member 143 rotation stopper spring 144 movable stopper member 150 exterior portion 151 housing case 151a Dimple 152 Rotor support member 152a Umbrella-shaped portion 152b Cylindrical portion 152c Engaging concave portion 153 Cylindrical member 300 Refrigeration cycle system 310 Outdoor unit 311 Expansion valve 312 Outdoor heat exchanger 313 Flow path switching valve 314 Compressor 315 Indoor heat exchanger 320 indoor unit

Claims (6)

a valve body unit including a valve body that controls the opening and closing of the valve port;
The valve body unit controls the movement of the valve body toward or away from the valve port so as to adjust the flow rate of fluid passing between the end of the valve body and the periphery of the valve port. an electromagnetic actuator comprising a rotor shaft and a magnet rotor for actuating a drive mechanism for producing motion;
a female thread member that rotatably supports the rotor shaft;
a valve body housing to which the female threaded member is fixed;
It has an outer peripheral edge portion that protrudes from the outer peripheral portion of the female thread member in a direction perpendicular to the central axis of the rotor shaft, and is fixed to the female thread member and welded to the peripheral edge of the opening upper surface of the valve body housing. a fixing bracket for fixing the female screw member;
A rotor shaft and a magnet rotor of the electromagnetic actuator, and a housing case for housing,
The fixing bracket is formed on the outer peripheral edge so as to be concentric with the central axis of the storage case, and has contact surfaces protruding toward the inner peripheral surface of the storage case. a plurality of guide portions spaced apart along a direction; and a plurality of recesses recessed in the central axis direction of the fixture from the contact surface of the guide portions between the plurality of guide portions. and a welded portion formed in the recess, the welded portion being welded and fixed to the upper surface of the opening of the valve body housing, wherein the contact surface of the guide portion extends along the central axis of the rotor shaft. A motor-operated valve, characterized in that it is formed on the circumference of a common imaginary circle with a center, and the bead of the welded portion is formed in a region inside the imaginary circle. 2. The motor-operated valve according to claim 1, wherein the radial width of the bead of the weld formed in the recess is smaller than the radial recess depth of the recess in the plurality of recesses. The contact surface of the guide portion is formed on the circumference of a common virtual circle centered on the central axis of the rotor shaft, and the diameter of the virtual circle is larger than the outer diameter of the magnet rotor. 3. The motor-operated valve according to claim 1, wherein the diameter is set to be large and smaller than the inner diameter of the inner peripheral surface of the housing case. the recess includes an arcuate surface portion extending in the circumferential direction of the fixture,
4. The electric valve according to any one of claims 1 to 3, wherein the radius of curvature of the outer peripheral surface of the arcuate portion is set smaller than the radius of curvature of the contact surface. The motor operated valve according to any one of claims 1 to 4, wherein the plurality of recesses have the same radial recess depth. 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 5 is used as the expansion valve. A refrigeration cycle system characterized by:

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