CN114688267B - Electric valve and refrigeration cycle system - Google Patents

Abstract

The invention provides an electric valve and a refrigeration cycle system, which have a structure capable of enabling the axes of a housing case and a valve main body to be consistent with each other with high precision without requiring complicated management of assembly precision. An electrically operated valve (100) is provided with: a rotor shaft (131) fixed to the center axis (CL) of the magnetic rotor (141) and having an external thread (131 a); a valve body housing (111) formed with a valve chamber, a port, and a joint; a female screw member (132) having a female screw portion (132 b) screwed with the male screw portion; a fixed metal part (133) formed in a plate shape and integrally fixed with the female screw member; and a cup-shaped accommodating case (151). The outer periphery of the fixed metal part is formed with: a guide part (133 c) formed along an imaginary Circle (CI) with a radius of a part farthest from the central axis and embedded in the inner side of the accommodating shell; and a welding part (133 d) welded and fixed to the joint part of the valve body shell at a part other than the guide part.

Description

Electric valve and refrigeration cycle system

The invention is a divisional application of the invention application with the application number 202010087261.7, the invention name of an electric valve and a refrigeration cycle system, and the application date of 2020, 2 and 11.

Technical Field

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

Background

In a heat pump refrigeration cycle system, an electric valve used as an electric expansion valve is known, for example, from fig. 1 of patent document 1.

The electric valve includes a stepping motor, a valve housing as a valve main body portion, a valve mechanism portion, and a closed housing as a housing. The stepping motor includes a rotor shaft, a magnetic rotor in a sealed case, and a stator coil disposed on an outer peripheral portion of the sealed case so as to face the magnetic rotor. The male screw portion of the rotor shaft is screwed into the female screw portion of a support member of a valve mechanism portion described later. The valve housing has a valve chamber in communication with the first fitting tube and with the second fitting tube via a valve port of the valve seat ring. The valve mechanism section has a support member, a valve frame, and a needle valve. The synthetic resin support member is fixed to the upper end surface of the valve housing by welding via a stainless steel flange portion as a fixing metal component by insert molding. The upper end surface of the valve housing is welded to the lower opening end surface of the hermetic case at a position distant from the outer peripheral portion of the flange portion with a predetermined gap.

In order to smoothly rotate the rotor shaft and the magnetic rotor by the operation of the stepping motor, it is necessary that a proper gap is formed between the inner peripheral surface of the hermetic case and the outer peripheral surface of the magnetic rotor, and the central axis of the hermetic case welded to the upper end surface of the valve case is located on the central axis of the valve case.

Prior art literature

Patent literature

Patent document 1: japanese patent laid-open No. 2018-115743

Disclosure of Invention

Problems to be solved by the invention

As disclosed in patent document 1, as shown in fig. 8 (a) of the drawings of the present application, an opening end surface of a lower portion of a sealed case 1051 is welded to an upper end surface of a valve housing 1011 at a position distant from an outer peripheral portion of a flange portion 1033 which is the above-described fixed metal member by a predetermined gap Δg. In fig. 8 (a), the beads between the sealed housing 1051 and the valve housing 1011 are not shown. The predetermined gap Δg is provided so as to avoid a bead (welding thickened portion) 1033w formed on the inner peripheral surface of the lower end of the sealed housing 1051 when the opening end surface of the lower portion of the sealed housing 1051 and the upper end surface of the valve housing 1011 are welded and the outer peripheral portion of the flange portion 1033 and the upper end surface (annular joint portion 1011 d) of the valve housing 1011 are fillet welded. If the gap Δg is not provided between the inner peripheral surface of the lower portion of the sealed housing 1051 and the outer peripheral surface of the flange 1033, as shown in fig. 9 (a) and 9 (b) in partial enlargement, the inner peripheral surface of the lower end of the sealed housing 1051' is caught by the bead (welding thickened portion) 1033w ', and as a result, the axial center of the sealed housing 1051' is offset from the axial center of the valve housing 1011', and an axial gap Δg ' is formed between the sealed housing 1051' and the valve housing 1011 '. Therefore, the opening end surface of the lower portion of the sealed housing 1051' may not be welded to the upper end surface of the valve housing 1011' due to the size of the gap Δg '.

In the case of performing such welding operation, the sealed housing 1051 and the valve housing 1011 are positioned and held by a jig or the like in the welding machine so that the central axis of the sealed housing 1051 and the central axis of the valve housing 1011 are positioned at the same central axis.

However, in order to ensure high assembly accuracy in the assembly process, the position of the sealed housing 1051 and the valve housing 1011 needs to be adjusted and held by a jig or the like in a welding machine so that the central axis of the sealed housing 1051 and the central axis of the valve housing 1011 are located at the same central axis, and in this case, in the assembly process of the electric valve, the management of the assembly accuracy becomes complicated. Therefore, in assembling the sealed housing 1051 and the valve housing 1011, it is desirable that the axes of the sealed housing 1051 and the valve housing 1011 be aligned with each other with high accuracy, and that the assembly be performed by a simple welding operation.

In view of the above, an object of the present invention is to provide an electric valve and a refrigeration cycle system including the same, which are configured to be assembled with high precision without requiring complicated management of assembly precision, and to enable axes of a housing case and a valve body to be aligned with each other.

Means for solving the problems

In order to achieve the above object, an electrically operated valve according to the present invention includes: a valve body case having a valve chamber that communicates with at least one connection port of a pipe line connected to a fluid, and that houses a valve body unit including a valve body that performs opening and closing control of a valve port of a valve seat provided in the connection port so as to be movable; an electromagnetic actuator including a rotor shaft and a magnetic rotor for operating a drive mechanism for controlling a valve element unit to be movable toward and away from a valve port of a valve seat so as to adjust a flow rate of a fluid passing between an end of the valve element and a peripheral edge of the valve port of the valve seat; an internally threaded member that guides the valve element unit and rotatably supports the rotor shaft; a fixing metal part having an outer peripheral edge portion protruding from an outer peripheral portion of the female screw member in a direction orthogonal to a central axis of the rotor shaft, fastened to the female screw member, and fixed to the female screw member by welding to a peripheral edge of an opening end portion of the valve main body casing into which a lower portion of the female screw member is inserted; and a housing case housing the rotor shaft of the electromagnetic actuator, the magnetic rotor, the female screw member, and the fixing metal part, the fixing metal part being formed on an outer peripheral edge portion so as to be concentric with a central axis of the housing case, and having a plurality of guide portions each having an abutment surface abutting an inner peripheral surface of the housing case, and a welding portion formed on an upper surface of an opening end portion of the valve main body case, the welding portion being welded and fixed to a welding portion formed on an inner side of the plurality of guide portions in a direction of the central axis of the fixing metal part than the abutment surface of the guide portion.

The contact surface of the guide portion may be formed so as to be located on the circumference of a common virtual circle centered on the central axis of the rotor shaft, the virtual circle having a diameter set larger than the outer diameter of the magnetic rotor and smaller than the inner diameter of the inner peripheral surface of the housing.

An intersection point at which a line around the central axis of the fixed metal part and the virtual circle intersect at least at an equal angle N, where N is an integer of 3 or more, may be located on the contact surface of the guide portion.

At least one of the contact surfaces of the plurality of guide portions of the fixed metal part may be an arc surface extending along the inner peripheral surface of the housing case. The welded portion may be welded and fixed to the upper surface of the opening end portion of the valve body case by a plurality of spot welds, a plurality of spot fillet welds spaced apart from each other, or continuous fillet welds.

The motor-operated valve according to the present invention is characterized by comprising: a valve body case having a valve chamber that communicates with at least one connection port of a pipe line connected to a fluid, and that houses a valve body unit including a valve body that performs opening and closing control of a valve port of a valve seat provided in the connection port so as to be movable; an electromagnetic actuator including a rotor shaft and a magnetic rotor for operating a drive mechanism for controlling a valve element unit to be movable toward and away from a valve port of a valve seat so as to adjust a flow rate of a fluid passing between an end of the valve element and a peripheral edge of the valve port of the valve seat; an internally threaded member that guides the valve element unit and rotatably supports the rotor shaft; a fixing metal part with an edge step, which has an outer peripheral edge part protruding from an outer peripheral part of the internal thread part in a direction orthogonal to a central axis of the rotor shaft, is fastened to the internal thread part, and is fixed by welding to an upper surface of an opening end part of the valve main body housing into which a lower part of the internal thread part is inserted; and a housing case housing the rotor shaft and the magnetic rotor of the electromagnetic actuator, the female screw member, and the fixed metal part with the edge step, the fixed metal part with the edge step being formed so as to be concentric with a central axis of the housing case, and having a guide portion having an abutment surface abutting against an inner peripheral surface of the housing case, and a welding portion being a welding portion integrally formed with the guide portion at a position below the guide portion facing a portion surrounded by the inner peripheral surface of the housing case and an upper surface of an opening end portion of the valve body case, and being welded and fixed to an upper surface of the opening end portion of the valve body case closer to the central axis of the rotor shaft than the abutment surface of the guide portion.

The contact surface of the guide portion may be formed so as to be located on the circumference of a common virtual circle centered on the central axis of the rotor shaft, the virtual circle having a diameter set larger than the outer diameter of the magnetic rotor and smaller than the inner diameter of the inner peripheral surface of the housing. In the case where the fixed metal part having the edge step has a plurality of guide portions, at least an intersection point where a line dividing the periphery of the central axis of the fixed metal part at an equal angle N, where N is an integer of 3 or more, intersects with the virtual circle may be located on the contact surface of each guide portion.

The refrigeration cycle system according to the present invention includes an evaporator, a compressor, and a condenser, and the electrically operated valve is provided in a pipe disposed between an outlet of the condenser and an inlet of the evaporator.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the electric valve and the refrigeration cycle system including the same of the present invention, the fixed metal part is formed on the outer peripheral edge portion so as to be concentric with the central axis of the housing case, and has the plurality of guide portions each having the contact surface with the inner peripheral surface of the housing case, and the welding portion which is formed between the guide portions and is located inward in the central axis direction of the fixed metal part than the contact surface of the guide portion, and the welding portion is welded and fixed to the peripheral edge of the opening end portion of the valve main body case, so that the axial centers of the housing case and the valve main body case can be assembled with high precision in agreement without requiring troublesome management of assembly precision.

Drawings

Fig. 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. 2 (a) is a cross-sectional view taken along line IIA-IIA shown in fig. 1, and shows the shape of the stationary metal part, fig. 2 (b) is an enlarged view showing the IIB part of fig. 2 (a), and fig. 2 (c) is a view illustrating the guide portion of the stationary metal part shown in fig. 2 (a).

In fig. 3, (a) of fig. 3 is a diagram showing a second embodiment of the fixing metal part, fig. 3 (b) is a diagram showing a third embodiment of the fixing metal part, and fig. 3 (c) is a diagram showing a fourth embodiment of the fixing metal part.

Fig. 4 is a longitudinal sectional view showing a schematic configuration of a second embodiment of the electrically operated valve of the present invention.

Fig. 5 is an enlarged cross-sectional view showing the V portion shown in fig. 4 in an enlarged manner.

Fig. 6 is a diagram showing an example of a configuration of a refrigeration cycle system using an example of an electrically operated valve according to the present invention.

Fig. 7 is a diagram showing a modification of a stationary metal component used in an example of the motor-operated valve of the present invention.

Fig. 8 (a) is a partial cross-sectional view partially enlarged showing a joint structure of a closed casing, a valve body, and a fixing metal part of an electric valve in the prior art document, and fig. 8 (b) is a partial cross-sectional view of the closed casing, the valve body, and the fixing metal part shown in fig. 8 (a).

Fig. 9 (a) is a partial cross-sectional view partially enlarged showing another example of a joint structure of a closed housing, a valve body, and a fixed metal part of an electric valve in the prior art document, and fig. 9 (b) is an enlarged cross-sectional view partially enlarged showing the IXB part shown in fig. 9 (a).

In the figure:

CL-center axis, 11-first joint, 12-second joint, 100, 200-motor valve, 110-valve body portion, 111-valve body housing, 111A-valve chamber, 111B-first port, 111C-second port, 111 d-joint portion, 112-valve seat, 112A-valve port, 120-valve cartridge unit, 121-valve needle, 122-valve spring, 123-spring holder, 123A-spring engaging portion, 124-washer, 125-valve needle housing, 125 a-open end portion, 130, 230-rotor shaft rotating portion, 131-rotor shaft, 131A-male screw portion, 131B-flange portion, 132, 232-female screw member, 132A, 232A-guide chamber, 132B, 232B-female screw portion, 132C, 232C-pressure equalizing hole, 133A, 133B, 133C, 233-fixed metal part, 133A, 133Aa, 133Ba1, 133Ca, 233A-protrusion, 133B, 133Ab, 133Bb, 133Cb, 233B-concave, 133C, 133Ac, 133Bc, 133Cc, 233C-guide, 133d, 133Ad, 133Bd, 133Cd, 233 d-welding, 140-rotor shaft driving, 141-magnetic rotor, 141A-rotor chamber, 141B-engaging protrusion, 142-rotor fixing member, 143-rotation limit spring, 144-movable limit member, 150-outer housing, 151-accommodating case, 151A-concave, 152-rotor supporting member, 152A-umbrella portion, 152B-cylindrical portion, 152C-engaging concave, 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.

Detailed Description

Fig. 1 schematically shows a structure and piping pipes of a first embodiment of an electrically operated valve according to the present invention.

The concept of up and down in the following description corresponds to up and down in fig. 1, for example, and indicates a relative positional relationship of each member, not an absolute positional relationship.

As shown in fig. 6, for example, the electrically operated valve 100 according to the first embodiment and the electrically operated valve 200 (see fig. 4) according to the second embodiment described later are disposed as the expansion valve 311 between an outlet (first port 312 a) of the outdoor heat exchanger 312 and an inlet (first port 315 a) of the indoor heat exchanger 315 in a pipe of the refrigeration cycle 300 during a cooling operation described later.

In the cooling operation, the expansion valve 311 is joined to the primary pipe Du1 via a connection pipe (second joint 12) described later, and is joined to the secondary pipe Du2 via a connection pipe (first joint 11). The primary pipe Du1 connects the outlet (first port 312 a) of the outdoor heat exchanger 312 and the expansion valve 311, and the secondary pipe Du2 connects the inlet (first port 315 a) of the indoor heat exchanger 315 and the expansion valve 311. Between the outlet (second port 315 b) of the indoor heat exchanger 315 and the inlet (second port 312 b) of the outdoor heat exchanger 312, a pipe Du3 joined to the outlet of the indoor heat exchanger 315, a flow path switching valve 313, and a pipe Du6 joined to the inlet of the outdoor heat exchanger 312 are disposed. The compressor 314 is coupled to the flow path switching valve 313 via a pipe Du4 and a pipe Du 5. The other end of the pipe Du3 is joined to the port 313d of the flow path switching valve 313. The other end of the pipe Du6 is joined to the port 313b of the flow path switching valve 313. One end of the pipe Du4 is joined to the port 313c of the flow path switching valve 313, and the other end of the pipe Du4 is joined to the discharge port of the compressor 314. One end of the pipe Du5 is joined to the port 313a of the flow path switching valve 313, and the other end of the pipe Du5 is joined to the suction port of the compressor 314. In the cooling operation, the port 313a communicates with the port 313d, and the port 313b communicates with the port 313 c. In this way, during the cooling operation, the refrigerant in the refrigeration cycle circulates in the direction indicated by the broken-line arrow shown in fig. 6, for example, and the outdoor heat exchanger 312 functions as a condenser and the indoor heat exchanger 315 functions as an evaporator. The description has been made of the case where the expansion valve 311 is joined to the primary pipe Du1 by the second joint 12 and joined to the secondary pipe Du2 by the first joint 11 during the cooling operation, but the present invention is not limited to this example, and for example, the expansion valve 311 may be joined to the primary pipe Du1 by the first joint 11 and joined to the secondary pipe Du2 by the second joint 12 during the cooling operation.

On the other hand, during the heating operation, the flow path switching valve 313 is switched such that the port 313a of the flow path switching valve 313 communicates with the port 313b and the port 313c communicates with the port 313 d. In this way, during the heating operation, the refrigerant in the refrigeration cycle circulates in the direction indicated by the solid arrow shown in fig. 6, for example, and the indoor heat exchanger 315 functions as a condenser and the outdoor heat exchanger 312 functions as an evaporator. 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 switched and controlled.

As shown in fig. 1, the electrically operated valve 100 includes: a valve driving unit which is disposed in a cylindrical housing case 151 constituting a part of the exterior part 150 described later, and which drives a valve element unit described later so as to be movable up and down; a valve body 110 coupled to a lower end of the housing 151 and including a valve seat 112 having a valve port 112a opened and closed by a front end portion of a needle 121 as a valve element; and a valve element unit disposed in the valve body 110 and including a valve needle 121 for opening and closing a valve port 112a of the valve seat 112.

The valve driving unit is configured to include: a rotor shaft 131 for elevating a valve element unit described later; a female screw member 132 having a female screw portion 132b formed with a female screw fitted concentrically with the male screw portion 131a of the rotor shaft 131, and fixed to the valve main body case 111 and serving as a guide support portion for guiding the valve element unit so as to be movable up and down; a magnetic rotor 141 that is rotatably supported and magnetized and is fixed concentrically with the guide shaft portion of the rotor shaft 131; and a stator coil (not shown) that is disposed on the outer periphery of the housing case 151 and rotates the magnetic rotor 141. The magnetic rotor 141 and the stator coil constitute a part of a stepping motor as an electromagnetic driver.

The rotor shaft 131 and the female screw member 132 form a part of a rotor shaft rotating portion 130 described later. The magnetic rotor 141 and the stator coil constitute a part of a rotor shaft driving section 140 described later.

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

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

The first joint 11 and the second joint 12 are both made of copper or stainless steel and are fixed to the valve body case 111 by brazing, welding, or the like, but the present invention is not limited thereto. In the electrically operated valve of the present embodiment, the description has been made with the first port 111b as the inflow side and the second port 111c as the outflow side, and the member through which the refrigerant flows, but the electrically operated valve 100 of the present embodiment is not limited to this, and is a two-way corresponding electrically operated valve that can be used even with the first port 111b as the outflow side and the second port 111c as the inflow side.

The valve seat 112 is formed of a metal material such as stainless steel or copper alloy, and is fixed around the second port 111c of the valve main body case 111 to which the second joint 12 is connected by welding, brazing, or the like. The valve needle 121 is disposed so as to be able to move closer to or farther from the valve port 112a along with the valve needle housing 125, thereby controlling the flow rate of the refrigerant passing through the valve port 112 a. The valve seat 112 is a separate member from the valve body case 111, but may be integrally formed with the valve body case 111.

The valve element unit 120 is configured to include the following components as main elements: a needle 121 for opening and closing a valve port 112a of the valve seat 112; a cylindrical resin spring holder 123 for engaging the flange 131b of the rotor shaft 131 with the inner peripheral edge of the opening end 125a of the needle housing 125 in cooperation with the resin washer 124; a valve spring 122 which is disposed between the spring engagement portion 123a of the spring holder 123 and the annular flat portion for the spring holder at one end of the needle 121, and which biases both in a direction away from each other; and a cylindrical needle housing 125 accommodating the spring holder 123, the valve spring 122, and one end of the needle 121.

The needle 121 is formed of a metal material such as stainless steel. The needle 121 is lifted and lowered along the center axis CL by a rotor shaft 131 or the like described later. Thereby, the flow rate of the refrigerant passing through the valve port 112a is controlled. A shape in which the center gently protrudes is formed on the side of the needle 121 near the valve port 112 a. The protruding shape is formed such that the effective opening area increases or decreases according to the position of the needle 121 by controlling the position of the needle 121 with respect to the valve port 112 a.

The valve spring 122 disposed in the substantially cylindrical valve needle housing 125 is disposed in compression between the valve needle 121 and a spring engaging portion 123a of a spring holder 123 described later. Further, by providing the valve spring 122, it is possible to prevent a screw thrust force generated by the rotor shaft 131 or the like described later from being directly applied to the needle 121, the valve port 112a or the like, and as a result, it is possible to improve the durability of the electric valve 100.

The spring holder 123 is formed of, for example, resin or the like in a substantially cylindrical shape. The spring holder 123 is disposed inside the valve needle housing 125 along the center axis CL between a flange portion 131b of the rotor shaft 131, which will be described later, and the valve needle 121, and is located inside the valve spring 122. A disk-shaped spring engaging portion 123a protruding in the outer diameter direction is formed at an end portion of the spring bracket 123 on the side contacting the rotor shaft 131. Further, by disposing the spring holder 123 along the center axis CL inside the valve spring 122, there is an effect of improving concentricity of the valve spring 122 and the spring holder 123 and improving workability of the valve element unit 120.

The gasket 124 is formed in a circular ring shape, for example, of a high-slip resin or the like. The gasket 124 is disposed between a flange portion 131b of the rotor shaft 131 described later and an opening end portion 125a of the needle housing 125 described later. Further, by providing the washer 124, it is possible to suppress the direct transmission of the rotation of the rotor shaft 131 to the needle 121. This suppresses rotation of the needle 121, and prevents wear between the needle 121 and the valve port 112a of the valve seat 112.

The needle housing 125 is formed into a substantially cylindrical shape by press working or the like from a metal material such as stainless steel. An open end 125a is formed at the rotor shaft 131 side end of the needle housing 125. The needle housing 125 has a function of transmitting a screw driving force of a rotor shaft 131 and the like described later to the needle 121. The open end portion 125a of the needle housing 125 is disposed so as to engage with the flange portion 131b of the rotor shaft 131 facing each other. The valve needle 121 is fixed to an end of the valve needle housing 125 opposite to the opening end 125a by welding or the like.

The rotor shaft driving unit 140 includes a magnetic rotor 141, a rotor fixing member 142, a rotation limiting spring 143, and a movable limiting member 144.

The magnetic rotor 141 is housed in a rotor chamber 141A in a housing 151 described later, and is configured by alternately disposing multipolar permanent magnets each having an N pole and an S pole formed of a ferrite sintered body or the like. In the present embodiment, the magnetic rotor 141 is disposed on the outer periphery of a housing case 151 described later, and forms a stepping motor together with a stator coil composed of a yoke, a bobbin, a coil, and the like, which are not shown. The present invention is not limited to the above, and similar effects can be obtained by using another motor capable of rotationally driving the magnetic rotor 141.

The magnetic 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 pressed into the mounting hole of the magnetic rotor 141.

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

The movable stopper member 144 has a coil spring shape of one turn and is rotatably disposed around the cylindrical portion 152b of the rotor support member 152. One end portion of the movable stopper member 144 is engaged with an engagement projection 141b integrally formed with a predetermined one pole of the magnetic rotor 141 having a plurality of poles, and the other end portion is screwed with the rotation stopper spring 143. The movable stopper 144 moves up and down while rotating around the cylindrical portion 152b in accordance with the rotation of the magnetic rotor 141. With this configuration, the rotation limiting spring 143 is disposed so as to be free from rattling with respect to the center axis CL of the motor-operated valve 100.

The outer case 150 includes a housing case 151, a rotor support member 152, and a cylindrical member 153.

The housing case 151 is formed by processing a non-magnetic metal material such as a stainless steel plate into a cup shape by press working or the like. The accommodation case 151 has an outer diameter substantially the same as that of the valve main body case 111 described above. The circular lower end portion of the housing case 151 is fixed to the circular upper end portion of the valve main body case 111 by butt welding over the entire circumference, for example, by TIG welding, plasma welding, laser welding, resistance welding, or the like. Thereby, the inside of the housing case 151 is sealed. A recess 151a is formed in the housing case 151, and the recess 151a is engaged with an engagement 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 formed of a material such as a stainless steel plate by press working or the like. The rotor support member 152 is constituted by 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 152 a. An engagement recess 152c is formed in the cup-shaped portion 152 a. By the engagement of the engagement recess 152c with the recess 151a of the housing case 151, the rotor support member 152 is fixed to a predetermined mounting position of the housing case 151.

The cylindrical member 153 is made of a metal or a synthetic resin and has high lubricity. The tubular member 153 is disposed 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.

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

The rotor shaft 131 is formed of, for example, a metal material, is formed in a substantially cylindrical shape, and extends in the up-down direction along the center axis CL of the motor-operated valve 100. The magnetic rotor 141 rotated by a motor such as a stepping motor described later is fixed around the axial center of the rotor shaft 131 via a rotor fixing member 142 described later. Thereby, the rotor shaft 131 rotates around the center axis CL along with the magnetic rotor 141.

A male screw portion 131a is formed in a portion of the rotor shaft 131 closer to the needle 121 than the rotor fixing member 142. The male screw portion 131a is screwed into a female screw portion 132b of a female screw member 132 described later. Further, a flange portion 131b protruding in a circular plate shape in the outer diameter direction is formed at an end portion of the rotor shaft 131 on the needle 121 side of the male screw portion 131a. The flange 131b is disposed at a position distant from the inner peripheral surface of the opening end 125a of the needle housing 125. The flange portion 131b has a larger diameter than the hole of the opening end portion 125a, thereby preventing the falling-off.

The female screw member 132 is formed of, for example, resin in a substantially cylindrical shape. A female screw portion 132b fitted to the male screw portion 131a of the rotor shaft 131 is formed at an upper portion of the female screw member 132. The female screw portion 132b is formed concentrically with the center axis CL of the motor-operated valve 100. The female screw member 132 is coupled to the screw of the rotor shaft 131, and thus constitutes a part of a screw feeding mechanism for converting the rotational movement of the magnetic rotor 141 into linear movement in the direction of the center axis CL of the rotor shaft 131.

A guide chamber 132A is formed in a portion of the female screw member 132 below the female screw portion 132b, and the guide chamber 132A can accommodate the needle housing 125 that accompanies sliding of the needle 121. The inner peripheral surface of the female screw member 132 forming the guide chamber 132A becomes a guide surface for movably guiding the outer peripheral surface of the cylindrical needle housing 125. In addition, a pressure equalizing hole 132c penetrating to the outside is provided in a part of the inner peripheral surface forming the guide chamber 132A. Thereby, the guide chamber 132A communicates with the rotor chamber 141A, and movement of the rotor shaft 131 and the needle housing 125 is facilitated. Further, a protruding portion 132B is formed at an end of the female screw member 132 below the portion where the pressure equalizing hole 132c is formed, and is inserted into the opening end of the valve main body case 111. The fixing metal part 133 is fixed to the protruding portion 132B by insert molding. At this time, the fixing metal part 133 is fixed concentrically with the central axis of the female screw member 132.

For example, as shown in fig. 2 (a), the stationary metal part 133 is a disk-shaped member made of metal. The arcuate surface or the inclined surface of the recess 133b of the outer peripheral portion of the fixing metal fitting 133 described later is fixed to the annular joint portion 111d of the valve main body case 111 by welding or the like. Thereby, the female screw member 132 is fastened to the valve main body case 111 via the fixing metal part 133. At this time, the female screw member 132 is fastened concentrically with the central axis of the valve main body case 111.

In the motor-operated valve 100 according to the first embodiment of the present invention described above, the above-described simple-shaped fixing metal fitting 133 is used to solve the conventional problems, and thus, a structure capable of automatically maintaining the coaxiality of the housing case 151 and the female screw member 132 is provided. Hereinafter, this structure will be described with reference to fig. 2 (a) and 2 (b).

Fig. 2 (a) is a cross-sectional view taken along line IIA-IIA shown in fig. 1, and shows the shape of the stationary metal part 133, fig. 2 (b) is a partially enlarged view showing the IIB part of fig. 2 (a), and fig. 2 (c) is a view illustrating the guide portion 133c (hereinafter also referred to as a convex portion 133 a) of the stationary metal part 133 shown in fig. 2 (a).

As shown in fig. 2 (a) and 2 (b), the fixing metal part 133 according to the first embodiment is, for example, a substantially disk-shaped metal member, and four protruding portions 133a are provided along the outer periphery of the disk shape. Each of the convex portions 133a has an abutment surface that protrudes in the radial direction so as to abut against the inner peripheral surface of the accommodation case 151. The four protruding portions 133a are formed in a substantially circular arc shape so that the tip ends thereof contact the inner peripheral surface 151b of the cup-shaped housing case 151. The contact surface is not limited to the entire surface contact, and may be, for example, a part of the contact surface may be in line contact or point contact.

The four protruding portions 133a are formed at equal angular (90 °) intervals along the circumferential direction of the stationary metallic part 133. In addition, each of the convex portions 133a is formed to have the same width W in the circumferential direction. Four concave portions 133b are formed between the continuous convex portions 133a and the convex portions 133 a. The concave portion 133b is formed by an arc surface portion extending in the circumferential direction of the fixed metal part 133, and a slope portion connected to both ends of the arc surface portion and reaching the contact surface of the guide portion 133 c. The radius of curvature of the outer peripheral surface of the circular arc portion forming the concave portion 133b is set smaller than the radius of curvature of the abutment surface forming the convex portion 133 a.

Here, the concave portion 133b is provided at a portion other than the convex portion 133a on the outer periphery of the plurality of convex portions 133 a.

At this time, the concave portion 133b is formed by an arc surface portion extending in the circumferential direction of the fixed metal part 133, and a slope portion connected to both ends of the arc surface portion and reaching the contact surface of the guide portion 133 c. In the concave portion 133b, for example, when all the arc surface portions are fillet welded and the slope surface portions are not welded, the welded arc surface portions form welded portions 133d. For example, when the arc surface portion is welded at predetermined intervals by a plurality of spot welds and the inclined surface portion is not welded, the welded portion 133d is formed at each spot welded portion. When only the inclined surface portions of the two portions are spot welded or fillet welded and the arc surface portion is not welded, the spot welded or fillet welded portion forms a welded portion 133d. As shown in fig. 2 (b), the arc surface portion or the inclined surface portion that is not welded, in other words, the arc surface portion or the inclined surface portion that is not welded may be a welding range.

In this example, all of the contact surfaces of the four protruding portions 133a are in contact with the inner peripheral surface 151b of the housing case 151, but this is not necessarily required, and for example, all of the contact surfaces of the four protruding portions 133a (guide portions 133 c) may not be in contact with the inner peripheral surface 151b of the housing case 151.

The guide portion 133c (the convex portion 133 a) will be described in more detail with reference to fig. 2 (a) and 2 (c). The contact surface of each guide portion 133c is formed so as to be located on the circumference of a common virtual circle CI centered on the center axis CL of the rotor shaft 131. The radius of the virtual circle CI is set to, for example, a length to a portion farthest from the center axis CL of the stationary metallic part 133 concentric with the rotor shaft 131. Thereby, at the time of assembly, the fixing metal part 133 is fitted into the inner peripheral surface 151b of the accommodating case 151. The guide portion 133c may be configured to prevent the inner peripheral surface 151b of the housing case 151 from interfering with the magnetic rotor 141 that performs the rotational movement, and to maintain the coaxiality (coaxiality, concentricity) between the housing case 151 and the female screw member 132. 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 magnetic rotor 141 and smaller than the inner diameter of the inner peripheral surface 151b of the housing 151 (the outer diameter of the magnetic rotor 141 < the diameter of the virtual circle CI < the inner diameter of the housing 151). As shown in fig. 2 (c), it is preferable that an intersection point at which a line around the center axis CL of the fixed metal part 133 and the virtual circle CI intersect at an equal angle 4 is located on an abutment surface of the guide part 133c abutting against the inner peripheral surface 151b of the housing case 151. The above-described coaxiality can be maintained by dividing the optical fiber into 4 equal parts, but the present invention is not limited thereto, and the optical fiber can be divided into N equal parts (N is an integer of 3 or more).

When the arcuate surfaces or inclined surfaces of the four concave portions 133b are welded and fixed to the joint 111d of the valve main body case 111, the welded portions 133d, which will be described later, may be welded and fixed to portions other than the guide portions 133 c. As described above, the concave portion 133b is formed by the circular arc surface portion extending in the circumferential direction of the fixed metal part 133, and the inclined surface portion connected to both ends of the circular arc surface portion and reaching the contact surface of the guide portion 133 c. For example, as shown in fig. 2 (b), the area of the arc surface portion and the slope surface portion in fig. 2 (a) where the recess 133b is formed closest to the center axis CL includes not only the arc surface portion but also the slope surface portion, and the arc surface portion or the slope surface portion to be welded is a welded portion 133d. As a result, the beads formed in the welded portion 133d are not formed on the outer side of the virtual circle CI but formed in the region that becomes the inner side of the virtual circle CI, and therefore there is no concern that the beads will interfere with the inner peripheral surface 151b of the housing case 151.

Further, the welded portion 133d cannot be provided inside the inner diameter of the annular joint portion 111d of the valve main body case 111 shown by the broken line in fig. 2 (a). This is because the fixing metal part 133 cannot be in contact with the valve main body case 111, and cannot be welded and fixed.

In this configuration, when the above-described electric valve 100 is assembled, first, the rotor shaft 131, the needle housing 125 to which the needle 121 is fixed, and the like, which are assembled with each other, are attached to the female screw member 132, and then the protruding portion 132B of the female screw member 132 is inserted into the opening end portion of the valve body housing 111, and the fixing metal fitting 133 is placed on the periphery of the opening end portion of the valve body housing 111 to which the valve seat 112 and the like are attached in advance. Next, the peripheral edges of the circular arc surface portion of the concave portion 133b of the fixing metal fitting 133 and the opening end portion of the valve main body case 111 are fixed by fillet welding using a first welder (not shown), for example. Thereby, a first bead is formed at the joint portion 111d of the valve body case 111 and the welded portion 133d which is the arc surface portion to be welded.

The radial clearance between the protruding portion 132B of the female screw member 132 and the opening end portion of the valve main body case 111 may be set to, for example, clearance fit or interference fit.

Next, after the magnetic rotor 141 is attached to the rotor shaft 131, the valve main body case 111 is detached from the first welding machine, and after the assembled valve main body case 111 is transferred to a support table (not shown) of the second welding machine, the lower end portion of the housing case 151 is placed on the periphery of the opening end portion of the valve main body case 111 without a gap, so that the inner peripheral surface 151b of the housing case 151 to which the rotor support member 152 or the like is attached is brought into contact with the contact surface of the guide portion 133c of the fixing metal part 133 in the periphery of the opening end portion of the valve main body case 111 to which the welding portion 133d of the fixing metal part 133 is fixed. Accordingly, 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.

Further, in the support base of the second welding machine, the housing case 151 and the valve main body case 111 having substantially the same outer diameter are gripped as a whole, whereby the welding operation is performed on the joint portion 111d between the lower end surface of the housing case 151 and the valve main body case 111 in a state where the axial centers of the housing case 151 and the valve main body case 111 coincide with each other. Thereby, a second bead is formed adjacent to the first bead at the joint portion 111d between the lower end surface of the housing case 151 and the valve main body case 111.

In this way, by providing the plurality of guide portions 133c (the convex portions 133 a) and the plurality of concave portions 133b on the outer periphery of the fixed metal part 133, for example, in a circular plate shape, the abutting surface of the guide portion 133c abuts against the inner peripheral surface 151b of the housing case 151, the fixed metal part 133 and the valve body case 111 can be welded and fixed by the welded portion 133d formed in the concave portion 133b which does not abut against the inner peripheral surface 151b of the housing case 151, and the welding bead formed in the welded portion 133d does not interfere with the inner peripheral surface 151b of the housing case 151, so that the valve body case 111 and the housing case 151 can be mutually in contact with each other without a gap, and the fixation can be maintained coaxially.

In the above example, it is not necessary that all of the contact surfaces of the guide portions 133c contact the inner surface of the housing case 151, and the end of the housing case 151 may be brought into close contact with the end of the valve main body case 111 to maintain the coaxiality between the fixing metal piece 133 and the housing case 151 in a state where all of the contact surfaces of the guide portions 133c do not contact the inner surface of the housing case 151. This is because the contact surface of the guide portion 133c mechanically acts as a stopper from a range from which the magnetic rotor 141 does not contact the inner peripheral surface 151b of the housing case 151 to a range where the magnetic rotor 141 does not contact the inner peripheral surface 151b when the housing case 151 and the valve main body case 111 are rotated by an offset amount, and prevents the housing case 151 from being offset.

The protruding portion 133a (guide portion 133 c) formed on the fixing metal member 133 is provided at four locations here, but the protruding portion may be provided at a plurality of two or more locations satisfying the above-described condition, since the coaxiality with the housing case 151 is ensured. Hereinafter, a second embodiment to a fourth embodiment (modification) of the fixing metal part will be described with reference to fig. 3 (a) to 3 (c).

Fig. 3 (a) is a diagram showing another example of the shape of the fixing metal part, fig. 3 (b) is a diagram showing another example of the shape of the fixing metal part, and fig. 3 (c) is a diagram showing another example of the shape of the fixing metal part.

As shown in fig. 3 (a), in the fixing metal part 133A as the second embodiment, three convex portions 133Aa (hereinafter also referred to as guide portions 133 Ac) and three concave portions 133Ab between the convex portions 133Aa and 133Aa on the circumference are formed. The three protruding portions 133Aa are formed apart from each other at equal angular intervals, for example, 120 ° intervals. The widths W of the respective projections 133Aa in the circumferential direction are set to be the same as each other. The concave portions 133Ab are formed apart from each other at equal angular intervals, for example, 120 ° intervals. The lengths of the circular arc surface portions forming the concave portions 133Ab in the circumferential direction are set to be the same as each other. As shown in fig. 3 (a), the contact surface of the guide portion 133Ac that contacts the inner peripheral surface of the housing case 151 has an intersection point where a line that equally divides the circumference of the center axis CL of the fixing metal part 133A by the equal angle 3 intersects with a virtual circle (a common circle that is present in the above-described contact surfaces similar to the virtual circle shown in fig. 2 (c)). Thereby, the condition for maintaining the above-described coaxiality is satisfied.

At this time, the concave portion 133Ab is formed by an arc surface portion extending in the circumferential direction of the fixing metal part 133 and a slope portion connected to both ends of the arc surface portion and reaching the contact surface of the guide portion 133 Ac. In the concave portion 133Ab, for example, when all the arcuate surface portions are fillet welded and the inclined surface portions are not welded, the welded arcuate surface portions form welded portions 133Ad.

As shown in fig. 3B, in the stationary metal part 133B as the third embodiment, a convex portion 133Ba1 (hereinafter also referred to as a guide portion 133 Bc) having a small width W and a convex portion 133Ba2 are provided at positions facing each other, and the convex portion 133Ba2 is formed of a circular arc face portion having a center angle of about 120 ° in the circumferential direction. Between the convex portion 133Ba1 and the convex portion 133Ba2 at two positions, a concave portion 133Bb including a circular arc surface portion formed in the circumferential direction is formed at two positions. The circumferential lengths (surface areas) of the contact surfaces of the convex portions 133Ba1 and the contact surfaces of the convex portions 133Ba2 are different from each other and are not equal to each other. As shown in fig. 3 (B), the contact surface of the guide portion 133Bc that contacts the inner peripheral surface 151B of the housing case 151 has an intersection point where a line that equally divides the circumference of the center axis CL of the fixed metal part 133B by the equal angle 3 intersects with a virtual circle (a common circle that is present in the above-described contact surfaces similar to the virtual circle shown in fig. 2 (c)). Thereby, the condition for maintaining the above-described coaxiality is satisfied.

At this time, the concave portion 133Bb is formed by an arc surface portion extending in the circumferential direction of the fixed metal part 133, and a slope portion connected to both ends of the arc surface portion and reaching the contact surface of the guide portion 133 Bc. In the concave portion 133Bb, for example, when all the arcuate surface portions are fillet welded and the inclined surface portions are not welded, the welded arcuate surface portions form welded portions 133Bd.

As shown in fig. 3 (C), two concave portions 133Cb are formed in opposition to each other in the remaining portions other than the two convex portions 133Ca (hereinafter also referred to as guide portions 133 Cc) formed in opposition in the fixing metal part 133C as the fourth embodiment. The abutment surfaces of the two convex portions 133Ca are formed of arc surfaces having the same center angle with each other. The outer peripheral surface of the concave portion 133Cb forming two portions is formed of curved surfaces having the same shape as each other. As shown in fig. 3 (C), the contact surface of the guide portion 133Cc that contacts the inner peripheral surface 151b of the housing case 151 has an intersection point where a line that equally divides the circumference of the center axis CL of the fixed metal part 133C at an equal angle 4 intersects with the virtual circle. Thereby, the condition for maintaining the coaxiality is satisfied.

At this time, the concave portion 133Cb is formed by a curved surface portion extending in the circumferential direction of the fixed metal part 133 and a slope portion connected to both ends of the curved surface portion and reaching the contact surface of the guide portion 133 Cc. In the concave portion 133Cb, for example, when all the curved surface portions are fillet welded and the inclined surface portions are not welded, the welded curved surface portions form a welded portion 133Cd.

By using such fixing metal parts 133, the fixing metal parts 133A, 133B, 133C of the second to fourth embodiments (modifications) are also in contact with the valve main body case 111 and the housing case 151 without any gap, as in the case of using the fixing metal parts 133 shown in fig. 2 (a), and the coaxiality can be maintained.

As described above, according to the electric valve 100 of the first embodiment of the present invention, the plurality of guide portions 133c and the plurality of welding portions 133d are provided along the outer periphery of the fixing metal member 133, so that interference between the welding beads possibly generated at the welding portions and the housing case 151 is prevented, the valve main body case 111 and the housing case 151 are in contact with each other without a gap, the fixation can be maintained coaxially, and the manufacturing management can be reduced.

The operation of the motor-operated valve 100 thus constructed will be described.

In driving the electric valve 100, first, a driving pulse signal is given to the stator. As a result, the magnetic rotor 141 rotates according to the number of pulses, and as the rotor shaft 131 rotates, the rotor shaft 131 moves along the central axis CL while rotating by the screw engagement of the male screw portion 131a of the rotor shaft 131 and the female screw portion 132b of the female screw member 132.

When the motor-operated valve 100 is in the closed state, the rotor shaft 131 needs to be moved downward. When the rotor shaft 131 moves further downward after the valve needle 121 comes into contact with the valve seat 112, the valve spring 122 contracts via the spring holder 123, and the valve needle 121 is pressed against the valve seat 112 by a load generated by a reaction force of the valve spring 122, so that the electric valve 100 is controlled to a reliable valve-closed state.

At this time, since the needle 121 is pressed against the valve seat 112 via the spring holder 123 and the valve spring 122, the frictional resistance of the seating surface is larger than the frictional resistance between the rotor shaft 131 and the high-slip spring holder 123, and the rotating rotor shaft 131 slides between itself and the spring holder 123, so that the transmission of rotation to the needle housing 125 and the needle 121 can be suppressed. This suppresses wear of the needle 121 and the valve port 112 a. Further, since the rotor shaft 131 is pushed in, the washer 124 descends together with the flange portion 131b of the rotor shaft 131, and the upper surface of the washer 124 does not contact the lower end surface of the opening end portion 125a of the needle housing 125, and the rotation of the needle housing 125 is stopped.

Next, when the motor-operated valve 100 is returned from the valve-closed state to the valve-open state, the rotor shaft 131 needs to be rotated in the reverse direction and moved upward. Along with the rise of the rotor shaft 131, the valve spring 122 is extended via the spring bracket 123. At this time, the needle 121 is held in contact with the valve seat 112. When the rotor shaft 131 moves further upward, the flange portion 131b of the rotor shaft 131 contacts the inner surface of the opening end portion 125a of the needle housing 125 via the gasket 124, and lifts the needle housing 125 while rotating. When the needle housing 125 is lifted, the needle 121 fixed thereto is also moved upward, and the needle 121 is brought into non-contact with the valve port 112a of the valve seat 112, whereby the electric valve 100 is controlled to be in the open state.

At this time, since the needle housing 125 and the needle 121 are driven by the rotor shaft 131 via the washer 124 having high sliding properties, the rotation of the rotor shaft 131 can be suppressed from being transmitted to the needle housing 125 and the needle 121. This suppresses wear of the needle 121 and the valve port 112 a.

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

Fig. 4 schematically shows a structure and piping pipes of a second embodiment of the electrically operated valve of the present invention. Fig. 5 is an enlarged cross-sectional view showing the V portion shown in fig. 4 in an enlarged manner.

As shown in fig. 4 and 5, the structure of the motor-operated valve 200 is different from the structure of the motor-operated valve 100 having the fixing metal part 133 in that the fixing metal part 233 with an edge step is insert-molded in the female screw member 232. More specifically, the outer peripheral portion of the substantially disk-shaped fixing metal fitting 233 with an edge step has an abutment surface for abutting against the inner peripheral surface 151b of the housing case 151, and has a stepped portion composed of a convex portion 233a (hereinafter also referred to as a guide portion 233 c) protruding outward, and a concave portion 233b formed as 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 main body case 111. As shown in fig. 5, a welded portion 233d is formed by a portion of the upper end surface of the valve main body case 111 (joint portion 111 d) forming the recess 233b and a portion of the lower end portion of the fixing metal part 233 with an edge step supported on the upper end surface of the valve main body case 111.

Other components of the motor-operated valve 200 are the same as those of the motor-operated valve 100 described above, and therefore, the same reference numerals are given to the same components, and a repetitive description thereof is omitted.

As shown in fig. 4 and 5, the stepped portion of the above-described fixing metal fitting 233 with an edge step is formed in the thickness direction along the center axis CL of the motor-operated valve 200. The recess 233b, which is a portion near the center axis CL, is formed on the lower side of the fixing metal part 233, that is, on the valve main body case 111 side, because the joint portion 111d between the lower end surface of the fixing metal part 233 and the valve main body case 111 is fillet welded. Further, since the contact surface of the guide portion 233c, which is a portion farther from the center axis CL than the recess 233b, contacts the inner peripheral surface 151b of the housing case 151, it is formed on the upper side of the fixing metal part 233, that is, on the housing case 151 side.

It is not necessarily required that the entire contact surface of the protruding portion 233a is in contact with the inner peripheral surface 151b of the housing case 151.

As a condition of the guide portion 233c, the fixing metal part 233 with an edge step is fitted into the inner peripheral surface 151b of the housing case 151 so that the contact surface of the guide portion 233c contacts the inner peripheral surface 151b of the housing case 151, as in the first embodiment. The guide portion 233c may be configured to prevent the inner peripheral surface of the housing case 151 from interfering with the rotating magnetic rotor 141, and to maintain the coaxiality (coaxiality, concentricity) of the housing case 151 and the valve main body case 111. Therefore, the diameter of the contact surface of the guide portion 233c is set to be larger than the outer diameter of the magnetic rotor 141 and smaller than the inner diameter of the inner peripheral surface 151b of the housing 151 (the outer diameter of the magnetic rotor 141 < the diameter of the contact surface < the inner diameter of the housing 151).

The lower end portion of the recess 233b, which is a portion other than the guide portion 233c, is welded to the joint portion 111d of the valve main body case 111. Thereby, the welded portion 233d is formed by the lower end portion of the fixed metal part 233 with the edge step, which forms the recess 233b, and the joint portion 111d of the valve main body case 111.

Note that the whole of the recess 233b need not be the welded portion 233d, but a part of the welded recess 233b may be welded, or may be welded and fixed by a plurality of spot welds or a plurality of spot fillet welds.

Further, the welded portion 233d cannot be provided inside the inner diameter of the annular joint portion 111d of the valve main body case 111. This is because the fixing metal part 233 cannot be in contact with the valve main body case 111, and cannot be welded and fixed. The weld 233d needs to be formed at a position where the weld bead 233w generated by welding with the valve main body case 111 does not interfere with the housing case 151.

The protruding portions 233a may be provided continuously over the entire circumference, or a plurality of protruding portions 233a may be provided intermittently, instead of continuously over the entire circumference. In this case, at least an intersection point, at which a line (n=an integer of 3 or more) dividing the circumference of the central axis of the fixed metal part at an equal angle N and a virtual circle similar to the virtual circle shown in fig. 2 (c) intersect, is located on the contact surface of the guide 233 c.

However, in the case where the convex portion 233a is provided over the entire circumference, the convex portion 233a is rounded, and thus the manufacturing becomes easy, and the manufacturing man-hour can be reduced.

The present embodiment can be also applied to the following modes, and the modes are also applicable to the scope of the present invention. In the stationary metal part with an edge step, for example, a circular plate serving as a guide portion is formed on the housing case 151 side, a small circular plate having a smaller diameter than the circular plate is integrally formed coaxially with a larger circular plate on the valve main body case 111 side, and a welded portion is formed on the small circular plate.

As described above, the electrically operated valve 200 according to the second embodiment of the present invention also has the same operational effects as those of the first embodiment, and also has an effect that the man-hour for manufacturing can be reduced.

In the present invention, the valve body case 111 and the fixing metal part 133 to be welded are described as members made of a metal material, but the present invention is not limited thereto, and for example, a thermoplastic resin or the like that can be welded may be used. The fixing metal parts 133 and 233 are described as disk-shaped members, but the present invention is not limited thereto, and as shown in fig. 7, a plate material having another shape such as a polygon such as a hexagon may be used as the fixing metal part 333.

As described above, according to the present invention, in order to solve the above-described conventional problems, it is possible to provide an electric valve and a refrigeration cycle system including the electric valve, which can maintain the coaxiality of the fixed valve main body case and the housing case with a simple structure of the components, and can reduce manufacturing management.

Claims (16)

1. An electrically operated valve, comprising:

A valve element unit including a valve element for controlling opening and closing of a valve port;

An electromagnetic actuator including a rotor shaft and a magnetic rotor for operating a drive mechanism for controlling the valve element unit to be movable toward and away from the valve port so as to adjust a flow rate of a fluid passing between an end of the valve element and a peripheral edge of the valve port;

an internal thread member rotatably supporting the rotor shaft;

A valve body case for fixing the female screw member;

a fixing metal part having an outer peripheral edge portion protruding from an outer peripheral portion of the female screw member in a direction orthogonal to a central axis of the rotor shaft, fastened to the female screw member, and fixed to a peripheral edge of an opening upper surface of the valve main body case by welding; and

A housing case housing the rotor shaft and the magnetic rotor of the electromagnetic actuator,

The fixed metal part is formed on the outer peripheral edge part in a concentric manner with the central axis of the accommodating case, and has a plurality of guide parts each having an abutment surface protruding toward the inner peripheral surface of the accommodating case and formed away from the fixed metal part in the circumferential direction, a plurality of recesses recessed in the central axis direction of the fixed metal part than the abutment surface of the guide part, and a welding part formed in the recesses and welded to the opening upper surface of the valve main body case by spot welding,

After the welding part is formed, the accommodating shell is welded on the same surface of the valve main body shell as the upper surface of the opening forming the welding part,

The contact surface of the guide portion is formed so as to be located on the circumference of a common virtual circle centered on the central axis of the rotor shaft, and the bead of the welded portion is formed in a region inside the virtual circle.

2. The electrically operated valve as set forth in claim 1, wherein,

The contact surfaces of the plurality of guide portions all contact the inner peripheral surface.

3. The electrically operated valve as set forth in claim 1, wherein,

The virtual circle has a diameter larger than an outer diameter of the magnetic rotor and smaller than an inner diameter of an inner peripheral surface of the housing case, and the contact surface of the guide portion of only a part of the plurality of guide portions is in contact with the inner peripheral surface.

4. The electrically operated valve as set forth in claim 1, wherein,

The diameter of the virtual circle is set to be larger than the outer diameter of the magnetic rotor and smaller than the inner diameter of the inner peripheral surface of the housing case, and the contact surfaces in the plurality of guide portions are not all in contact with the inner peripheral surface.

5. The electrically operated valve as set forth in claim 1, wherein,

Four protrusions serving as the guide portions are provided along the outer periphery of the disk shape of the fixed metal component, and four recesses are formed between the continuous protrusions.

6. The electrically operated valve as set forth in claim 5, wherein,

Four of the protruding portions are formed at equal angular intervals of 90 ° along the circumferential direction of the fixed metal component.

7. The electrically operated valve as set forth in claim 5, wherein,

Each of the convex portions of the fixing metal part is formed to have the same width in the circumferential direction.

8. The electrically operated valve as set forth in claim 1, wherein,

The length along the circumferential direction of the contact surface is shorter than the length along the circumferential direction of the recess.

9. The electrically operated valve as set forth in claim 1, wherein,

The radial depressions of the respective concave portions of the fixing metal parts are formed to have the same depth.

10. The electrically operated valve as set forth in claim 1, wherein,

The concave portion is formed by an arc surface portion extending in the circumferential direction of the fixed metal part, and a slope portion connected to both ends of the arc surface portion and reaching an abutment surface of the guide portion.

11. The electrically operated valve as set forth in claim 5, wherein,

The radius of curvature of the outer peripheral surface of the circular arc surface portion of the concave portion extending in the circumferential direction of the fixed metal part is set smaller than the radius of curvature of the contact surface of the convex portion.

12. The electrically operated valve as set forth in claim 10, wherein,

The arc surface portion is welded, and the inclined surface portion is not welded.

13. The electrically operated valve as set forth in claim 10, wherein,

The radial width of the bead of the welding part between the arc surface and the upper surface of the opening of the valve main body shell is smaller than the radial concave depth of the concave part of one part of the fixed metal part.

14. The electrically operated valve as set forth in claim 1, wherein,

An intersection point at which a line which bisects the periphery of the central axis of the fixed metal part at least at an equal angle N intersects with the virtual circle is located on the contact surface of the guide portion,

Wherein N is an integer of 3 or more.

15. An electrically operated valve as set forth in claim 1, wherein,

At least one of the contact surfaces of the plurality of guide portions of the fixing metal component is an arc surface extending along the inner peripheral surface of the housing case.

16. A refrigeration cycle system, characterized in that,

Comprises an evaporator, a compressor and a condenser,

The electrically operated valve according to any one of claims 1 to 15, wherein the electrically operated valve is provided in a pipe disposed between an outlet of the condenser and an inlet of the evaporator.