JP7098557B2 - Solenoid valve and refrigeration cycle system including it - Google Patents

Description

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

In a heat pump type refrigeration cycle system, an electric valve used as an electric expansion valve is known, for example, as described in FIG. 1 of Patent Document 1.

The motorized valve includes a stepping motor, a valve housing as a valve main body, a valve mechanism, and a closed case as a housing case. The stepping motor includes a rotor shaft, a magnet rotor in the closed case, and a stator coil arranged on the outer peripheral portion of the closed case so as to face the magnet rotor. The male threaded portion of the rotor shaft is screwed into the female threaded portion of the support member of the valve mechanism portion described later. The valve housing has a valve chamber that communicates with the first joint pipe and communicates with the second joint pipe via the valve port of the valve seat ring. The valve mechanism portion has a support member, a valve holder, 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 an insert-molded fixing bracket. Further, an open end surface at the lower part of the sealed case is welded to the upper end surface 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 magnet rotor to rotate smoothly due to the operation of the stepping motor, an appropriate gap is formed between the inner peripheral surface of the sealed case and the outer peripheral surface of the magnet rotor, and above the valve housing. It is required that the central axis of the sealed case welded to the end face be on the central axis of the valve housing.

Japanese Unexamined Patent Publication No. 2018-115743

As disclosed in Patent Document 1 described above, the upper end surface of the valve housing 1011 has a flange as the fixing bracket described above, as shown in FIG. The open end face of the lower part of the sealed case 1051 is welded to a position separated from the outer peripheral portion of the portion 1033 with a predetermined gap Δg. In FIG. 8A, the bead between the closed case 1051 and the valve housing 1011 is not shown. The reason why the predetermined gap Δg is provided is that the open end surface of the lower portion of the sealed case 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 of the valve housing 1011 (circle). This is to prevent the inner peripheral surface of the lower end of the closed case 1051 from riding on the bead (welded overlay portion) 1033w to be formed when the annular joint portion 1011d) is fillet welded. If the above-mentioned gap Δg is not provided between the inner peripheral surface of the lower part of the sealed case 1051 and the outer peripheral portion of the flange portion 1033, FIGS. 9 (a) and 9 (b) partially show. As shown in the enlarged view, the inner peripheral surface of the lower end of the sealed case 1051'rides on the bead (welded overlay) 1033w', and as a result, the axis of the sealed case 1051'is the valve housing 1011'. Along with being displaced with respect to the axial center, an axial gap Δg'is formed between the closed 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 sealed case 1051 ′ cannot be welded to the upper end surface of the valve housing 1011 ′.

When such welding work is performed, the sealed case 1051 and the valve housing 1011 are positioned by a jig or the like in the welding machine so that the central axis of the sealed case 1051 and the central axis of the valve housing 1011 are on the common central axis. Adjusted and retained.

However, during the assembly process, in order to ensure high assembly accuracy, the welder so that the sealed case 1051 and the valve housing 1011 have the central axis of the sealed case 1051 and the central axis of the valve housing 1011 on a common central axis. When it is necessary to adjust the position and hold it by a jig or the like in the above, control of assembly accuracy becomes complicated in the assembly work process of the motorized valve. Therefore, in assembling the closed case 1051 and the valve housing 1011, it is required that the axes of the closed case 1051 and the valve housing 1011 are aligned with each other with high accuracy, and that the closed case 1051 and the valve housing 1011 can be assembled by a simple welding operation.

In consideration of the above problems, the present invention is an electric valve and a refrigeration cycle system including the motorized valve, which does not require complicated assembly accuracy management, and is a mutual axis of a storage case and a valve body. It is an object of the present invention to provide an electric valve having a configuration capable of assembling with high precision matching, and a refrigeration cycle system including the electric valve.

In order to achieve the above object, the electric valve according to the present invention communicates with at least one connection port connected to the fluid pipeline, and controls the opening and closing of the valve port of the valve seat provided at the connection port. A valve body housing with a valve chamber that movably accommodates the valve body unit, including the body, and the flow of fluid through the valve body unit between the end of the valve body and the periphery of the valve port of the valve seat. To adjust the valve body unit, an electromagnetic actuator including a rotor shaft and a magnet rotor that activates a drive mechanism that causes the valve body to perform an operation that controls the valve body so as to be close to or separated from the valve port of the valve seat. It has a female screw member that guides and rotatably supports the rotor shaft, and an outer peripheral edge portion that protrudes from the outer peripheral portion of the female screw member in a direction orthogonal to the central axis of the rotor shaft, and is fixed to the female screw member and of the female screw member. A fixing bracket for fixing the female screw member by being welded to the peripheral edge of the open end of the valve body housing into which the lower portion is inserted, a rotor shaft and a magnet rotor of the electromagnetic actuator, a female screw member, and a fixing bracket are accommodated. The case is provided, and the fixing bracket is formed on the outer peripheral edge portion so as to be concentric with the central axis of the accommodating case, and has a plurality of guide portions each having a contact surface that abuts on the inner peripheral surface of the accommodating case. A welded portion formed inward in the central axis direction of the fixing bracket from the contact surface of the guide portions between the guide portions, which is welded and fixed to the upper surface of the open end portion of the valve body housing. It is characterized by having.

The contact surface of the guide portion is formed so as to be 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 and is accommodated. It may be set smaller than the inner diameter of the inner peripheral surface of the case.

On the contact surface of the guide portion, at least an intersection point where a line (an integer of N = 3 or more) obtained by equally dividing the circumference of the central axis of the fixing bracket at an equal angle and the virtual circle may be located may be located. ..

The contact surface of at least one of the contact surfaces of the plurality of guide portions in the fixing bracket may be an arc surface extending along the inner peripheral surface of the accommodating case. The welded portion may be welded and fixed to the upper surface of the open end portion of the valve body housing by a plurality of spot welds, a plurality of spot-shaped fillet welds separated from each other, or a continuous fillet weld.

Further, the electric valve according to the present invention is a valve body including a valve body that communicates with at least one connection port connected to a fluid pipeline and controls opening and closing of a valve seat of a valve seat provided at the connection port. A valve body housing with a valve chamber for movably accommodating the unit and the valve body unit 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 that activates a drive mechanism that controls the valve body so that it can be approached or separated from the valve port of the seat, and guides the valve body unit and rotates the rotor shaft. A valve body that has a female screw member that can support it and an outer peripheral edge that protrudes from the outer peripheral portion of the female screw member in a direction orthogonal to the central axis of the rotor shaft, is fixed to the female screw member, and the lower portion of the female screw member is inserted. A fixing bracket with a stepped edge for fixing the female screw member by being welded to the upper surface of the open end of the housing, a rotor shaft and a magnet rotor of the electromagnetic actuator, a female screw member, and a storage case for accommodating the fixing bracket are provided. The rimmed fixing bracket is formed concentrically with the central axis of the housing case, and has a guide portion having a contact surface that abuts on the inner peripheral surface of the housing case, and an opening of the inner peripheral surface of the housing case and the valve body housing. A welded portion integrally formed with the guide portion at a position below 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. It is characterized by having a welded portion to be welded and fixed to the upper surface of the open end portion of the above. The contact surface of the guide portion is formed so as to be 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 and is accommodated. It may be set smaller than the inner diameter of the inner peripheral surface of the case. When the fixing bracket with a rim has a plurality of guide portions, at least the circumference of the central axis of the fixing bracket is divided into N equal parts at an equal angle (an integer of N = 3 or more) on the contact surface of each guide portion. And the intersection where the virtual circle intersects may be located.

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

According to the electric valve according to the present invention and the refrigeration cycle system including the electric valve, the fixing bracket is formed on the outer peripheral edge portion so as to be concentric with the central axis of the accommodation case, and is in contact with the inner peripheral surface of the accommodation case. It is a welded portion formed inward in the central axis direction of the fixing bracket from a plurality of guide portions having contacting contact surfaces and the contact surface of the guide portions between the guide portions, and is an open end of the valve body housing. Since it has a welded portion that is welded and fixed to the peripheral edge of the portion, it is possible to assemble the housing case and the valve body housing so that the axes of the housing case and the valve body housing are aligned with each other with high accuracy without the need for complicated assembly accuracy management. ..

It is a vertical sectional view which shows the schematic structure of the 1st Embodiment of the electric valve which concerns on this invention. 2 (a) is a cross-sectional view taken along the line IIA-IIA shown in FIG. 1, showing the shape of the fixing bracket, and FIG. 2 (b) shows the IIB portion of FIG. 2 (a). It is an enlarged partial enlarged view, and FIG. 2 (c) is a figure explaining the guide portion of the fixing metal fitting shown in FIG. 2 (a). FIG. 3A is a diagram showing a second embodiment of the fixing bracket, FIG. 3B is a diagram showing a third embodiment of the fixing bracket, and FIG. 3C is a diagram of the fixing bracket. It is a figure which shows the 4th Example. It is a vertical sectional view which shows the schematic structure of the 2nd Embodiment of the electric valve which concerns on this invention. FIG. 3 is an enlarged cross-sectional view showing an enlarged portion of the V portion shown in FIG. It is a figure which shows an example of the structure of the refrigeration cycle system which used the example of the electric valve which concerns on this invention. It is a figure which shows the modification of the fixing metal fitting used as an example of the electric valve which concerns on this invention. FIG. 8 (a) is a partially enlarged partial cross-sectional view showing the joint structure of the closed case of the motorized valve, the valve body, and the fixing bracket in the prior art document, and FIG. 8 (b) is FIG. 8 (a). ) Is a partial cross-sectional view of the sealed case, the valve body and the fixing bracket. 9 (a) is a partially enlarged partial cross-sectional view showing another example of the joint structure of the closed case of the motorized valve, the valve body and the fixing bracket in the prior art document, and FIG. 9 (b) is a partial cross-sectional view. 9 is an enlarged cross-sectional view showing an enlarged IXB portion shown in FIG. 9A.

FIG. 1 schematically shows the configuration of the first embodiment of the motorized valve according to the present invention together with a pipe for piping.

It should be noted that the upper and lower concepts in the following description correspond to the upper and lower parts in FIG. 1, for example, and show the relative positional relationship of each member, not the absolute positional relationship.

The motorized valve 100 as the first embodiment and the motorized valve 200 (see FIG. 4) as the second embodiment described later are, for example, as shown in FIG. 6, the refrigeration cycle system 300 as the expansion valve 311. It is arranged between the outlet of the outdoor heat exchanger 312 (first port 312a) and the inlet of the indoor heat exchanger 315 (first port 315a) during the cooling operation described later in the piping.

The expansion valve 311 is joined to the primary side pipe Du1 by the connection pipe (second joint 12) described later during the cooling operation, and is joined to the secondary side pipe Du2 by the connection pipe (first joint 11). It is joined. The primary side pipe Du1 connects the outlet of the outdoor heat exchanger 312 (first port 312a) and the expansion valve 311, and the secondary side pipe Du2 is the inlet of the indoor heat exchanger 315 (first port 315a). And the expansion valve 311 are connected. Between the outlet of the indoor heat exchanger 315 (second port 315b) and the inlet of the outdoor heat exchanger 312 (second port 312b), there is 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 arranged. Further, the compressor 314 is joined to the flow path switching valve 313 by the pipe Du4 and the pipe Du5. 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. During the cooling operation, the port 313a and the port 313d communicate with each other, and the port 313b and the port 313c communicate with each other. As a result, during the cooling operation, the refrigerant in the refrigeration cycle system is circulated along the direction indicated by the broken line arrow shown in FIG. 6, for example, the outdoor heat exchanger 312 serves as a condenser, and the indoor heat exchanger 315 evaporates. It will function as a vessel. In the cooling operation, the expansion valve 311 is joined to the primary side pipe Du1 by the second joint 12, and is joined to the secondary side pipe Du2 by the first joint 11. Not limited to such an example, for example, during the cooling operation, the expansion valve 311 is joined to the primary side pipe Du1 by the first joint 11 and to the secondary side pipe Du2 by the second joint 12. You may.

On the other hand, during the heating operation, the flow path switching valve 313 is switched so that the port 313a and the port 313b of the flow path switching valve 314 communicate with each other and the port 313c and the port 313d communicate with each other. As a result, during the heating operation, the refrigerant in the refrigeration cycle system is circulated along the direction indicated by the solid arrow shown in FIG. 6, for example, the indoor heat exchanger 315 serves as a condenser, and the outdoor heat exchanger 312 evaporates. It will function as a vessel. The compressor 314 and the expansion valve 311 are driven and controlled, and the flow path switching valve 313 is switched and controlled by a control unit (not shown).

As shown in FIG. 1, the motorized valve 100 is a valve drive unit which is arranged in a cylindrical storage case 151 which constitutes a part of an exterior portion 150 described later and drives a valve body unit described later so as to be able to move up and down. , A valve body 110 having a valve seat 112 having a valve port 112a coupled to the lower end of the accommodation case 151 and opened and closed at the tip of the needle 121 as a valve body, and a valve seat 112 arranged in the valve body 110. It is configured to include a valve body unit including a needle 121 that opens and closes the valve port 112a.

The valve drive unit has a rotor shaft 131 for moving the valve body unit up and down, which will be described later, and a female screw portion 132b having a female screw fitted concentrically with the male screw portion 131a of the rotor shaft 131. Accommodates 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, and a magnet rotor 141 that is concentrically fixed to the guide shaft portion of the rotor shaft 131 and rotatably supported and magnetized. It is configured to include a stator coil (not shown) arranged on the outer peripheral portion of the case 151 and rotating the magnet rotor 141 as a main element. The magnet rotor 141 and the stator coil form a part of the stepping motor as an electromagnetic actuator.

The rotor shaft 131 and the female screw member 132 form a part of the rotor shaft rotating portion 130, which will be described later. Further, the magnet rotor 141 and the stator coil form a part of the rotor shaft drive unit 140, which will be described later.

The valve body housing 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 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. It has a valve chamber 111A to be accommodated in. In the valve chamber 111A, the other end of the needle 121 projects toward the valve port 112a. Further, the valve chamber 111A has 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 central axis of the needle 121. A valve seat 112 having a valve port 112a adjacent to the second port 111c is formed to which one end of a second joint 12 as a second passage on a common axis is connected.

An upper surface of the opening end portion to be joined to the lower end portion of the storage case 151, which will be described later, that is, a ring-shaped joint portion 111d is formed on the peripheral edge of the circular opening end portion on the upper portion of the valve body housing 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 housing 111 by brazing, welding, or the like. Not limited. Further, in the motorized valve of the present embodiment, the refrigerant flows with the first port 111b as the inflow side and the second port 111c as the outflow side, but the present invention is not limited to this. The motorized valve 100 is a bidirectionally compatible electric valve that can be used 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, for example, a metal material such as stainless steel or a copper alloy, and is fixed by welding or brazing around the second port 111c to which the second joint 12 of the valve body housing 111 is connected. To. By arranging the needle 121 with the needle case 125 so as to be close to or separated from the valve port 112a, the flow rate of the refrigerant passing through the valve port 112a is controlled. Although the valve seat 112 is a separate member from the valve body housing 111 here, it may be integrally molded with the valve body housing 111.

In the valve body unit 120, the needle 121 for opening and closing the valve port 112a of the valve seat 112 and the flange portion 131b of the rotor shaft 131 cooperate with the resin washer 124 to form the inner peripheral edge of the open end portion 125a of the needle case 125. It is arranged between the columnar resin spring receiver 123 to be engaged with the spring receiver 123, the spring engagement portion 123a of the spring receiver 123, and the spring receiving annular flat portion at one end of the needle 121, and both are separated from each other. The valve spring 122 for urging, the spring receiver 123, the valve spring 122, and the cylindrical needle case 125 for accommodating one end of the needle 121 are included as main elements.

The needle 121 is made of a metal material such as stainless steel. The needle 121 is moved up and down along the central axis CL by a rotor shaft 131 or the like described later. As a result, the flow rate of the refrigerant passing through the valve port 112a is controlled. On the side of the needle 121 close to the valve port 112a, a shape with a gently protruding center is formed. 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 described above.

The valve spring 122 arranged inside the substantially cylindrical needle case 125 is compressed and arranged between the needle 121 and the spring engaging portion 123a of the spring receiver 123 described later. The provision of the valve spring 122 has an effect of preventing the screw thrust force of the rotor shaft 131 or the like, which will be described later, from being directly applied to the needle 121, the valve port 112a, or the like, and as a result, enhances the durability of the motorized valve 100. effective.

The spring receiver 123 is formed of, for example, a resin or the like in a substantially cylindrical shape. The spring receiver 123 is arranged inside the needle case 125 between the flange portion 131b of the rotor shaft 131, which will be described later, and the needle 121, and is arranged inside the valve spring 122 along the central axis CL. A disk-shaped spring engaging portion 123a protruding in the outer diameter direction is formed at the end of the spring receiver 123 on the side in contact with the rotor shaft 131. By arranging the spring receiver 123 inside the valve spring 122 along the central axis CL, the concentricity between the valve spring 122 and the spring receiver 123 is enhanced, and the operability of the valve body unit 120 is improved. There is.

The washer 124 is formed in an annular shape, for example, with a highly slippery resin or the like. The washer 124 is arranged between the flange portion 131b of the rotor shaft 131 described later and the open end portion 125a of the needle case 125 described later. 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. As a result, the rotation of the needle 121 is suppressed, and the needle 121 and the valve seat 112 have an effect of preventing wear between the valve ports 112a and each other.

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 or the like, which will be described later, to the needle 121. The open end portion 125a of the needle case 125 is arranged so as to engage with the flange portion 131b of the rotor shaft 131 facing each other. Further, a needle 121 is fixed to the end of the needle case 125 on the opposite side of the open end 125a by welding or the like.

The rotor shaft drive unit 140 includes a magnet rotor 141, a rotor fixing member 142, a rotary 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 a multi-pole permanent magnet formed of a ferrite sintered body or the like and arranged alternately with N poles and S poles. In the present embodiment, the magnet rotor 141 is arranged on the outer periphery of the 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 the stepping motor is used here, the present invention is not limited to this, and the same effect can be obtained by using another electric motor capable of rotationally driving the magnet rotor 141.

The magnet rotor 141 is supported by the rotor shaft 131 via the rotor fixing member 142. The 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 rotary stopper spring 143 has a coil spring shape and is wound around a cylindrical portion 152b of a rotor support member 152 described later. The upper end and the lower end of the rotary stopper spring 143 are respectively engaged with 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 152b of the rotor support member 152. One end of the movable stopper member 144 is engaged with an engaging protrusion 141b integrally formed with a predetermined one pole of a magnet rotor 141 having multiple poles, and the other end is engaged with a rotary stopper spring 143. It is screwed. The movable stopper member 144 moves up and down while rotating around the cylindrical portion 152b in accordance with the rotation of the magnet rotor 141. With such a configuration, the rotary stopper spring 143 is arranged without rattling with respect to the central axis CL of the motorized valve 100.

The exterior portion 150 includes a storage case 151, a rotor support member 152, and a cylindrical 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 press working or the like. The housing case 151 has an outer diameter substantially the same as the outer diameter of the valve body housing 111 described above. The lower end of the circular shape of the housing case 151 is fixed to the upper end of the circular shape of the valve body housing 111 by, for example, TIG welding, plasma welding, laser welding, resistance welding, etc., so that the entire circumference is butt welded. Weld. As a result, the inside of the storage case 151 is sealed. Further, the accommodating case 151 is formed with dimples 151a for engaging with the engaging recess 152c formed in the cup-shaped portion 152a of the rotor support member 152 described later.

The rotor support member 152 is made of, for example, 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 that is in contact with and fixed to the accommodation case 151, and a cylindrical portion 152b that extends downward from the center of the cup-shaped portion 152a. An engaging recess 152c is formed in the cup-shaped portion 152a. By engaging the engaging recess 152c with the dimples 151a of the housing case 151, the rotor support member 152 is fixed at a predetermined mounting position of the housing case 151.

The tubular member 153 is made of a metal or synthetic resin and is made of a highly lubricious 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.

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

The rotor shaft 131 is formed of, for example, a metal material, is formed in a substantially columnar shape, and extends in the vertical direction along the central axis CL of the motorized valve 100. The magnet rotor 141 rotated by an electric motor such as a stepping motor described later is fixed around the axis of the rotor shaft 131 via a rotor fixing member 142 described later. As a result, the rotor shaft 131 rotates around the central axis CL with the magnet rotor 141.

A male screw portion 131a is formed on a portion of the rotor shaft 131 on the side of the needle 121 with respect to the rotor fixing member 142. The male threaded portion 131a is screwed into the female threaded portion 132b of the female threaded member 132 described later. Further, a flange portion 131b protruding in a disk shape in the outer diameter direction is formed at the end portion of the rotor shaft 131 on the needle 121 side with respect to the male screw portion 131a. 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. The diameter of the flange portion 131b is larger than the diameter of the hole of the opening end portion 125a, and the flange portion 131b is prevented from coming off.

The female screw member 132 is made of resin, for example, and is formed in a substantially cylindrical shape. A female threaded portion 132b fitted to the male threaded portion 131a of the rotor shaft 131 is formed on the upper portion of the female threaded member 132. The female threaded portion 132b is formed concentrically with the central axis CL of the motorized valve 100. The female screw member 132 constitutes a part of a screw feed mechanism that converts the rotary motion of the magnet rotor 141 into a linear motion in the CL direction of the central axis of the rotor shaft 131 by screw coupling 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 screw member 132 below the female screw portion 132b. The inner peripheral surface of the female screw member 132 forming the guide chamber 132A is a guide surface that movably guides the outer peripheral surface of the cylindrical needle case 125. Further, a pressure equalizing hole 132c penetrating to the outside is provided in a part of the inner peripheral surface forming the guide chamber 132A. As a result, the guide chamber 132A and the rotor chamber 141A communicate with each other, and the rotor shaft 131 and the needle case 125 can be easily moved. Further, an overhanging portion 132B to be inserted into the opening end portion of the valve body housing 111 is formed at an 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 overhanging 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 fixing bracket 133 is, for example, a metal disk-shaped member as shown in FIG. 2A. The arcuate surface or the slope portion of the concave portion 133b on the outer peripheral portion of the fixing bracket 133, which will be described later, is fixed to the 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 motorized valve 100 of the first embodiment of the present invention described above, by using the fixing metal fitting 133 having the above-mentioned simple shape in order to solve the conventional problems, the accommodation case 151 and the female screw member 132 can be used. A structure is provided that can automatically maintain coaxiality. Hereinafter, the structure thereof will be described with reference to FIGS. 2 (a) and 2 (b).

2A is a cross-sectional view taken along the line IIA-IIA shown in FIG. 1, showing the shape of the fixing bracket 133, and FIG. 2B is the IIB portion of FIG. 2A. 2 (c) is a partially enlarged view showing the guide portion 133c (hereinafter, also referred to as a convex portion 133a) of the fixing bracket 133 shown in FIG. 2 (a).

As shown in FIGS. 2A and 2B, the fixing bracket 133 as the first embodiment is, for example, a metal substantially disk-shaped member, and has a disk-shaped outer periphery. Along the line, four convex portions 133a are provided. Each convex portion 133a has a contact surface protruding in the radial direction so as to abut on the inner peripheral surface of the accommodation case 151. The shape of the four convex portions 133a is formed in a substantially arc shape so that the tip portion thereof abuts on the inner peripheral surface 151b of the cup-shaped storage case 151. The contact surface is not limited to surface contact, and may be configured such that, for example, a part of the contact surface is line-contacted or point-contacted.

The four convex portions 133a are formed at intervals of uniform angles (90 °) along the circumferential direction of the fixing bracket 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 portion 133a and the convex portion 133a. The recess 133b is formed of an arc surface portion extending in the circumferential direction of the fixing bracket 133 and a slope portion connected to both ends of the arc surface portion and reaching the contact surface of the guide portion 133c. The radius of curvature of the outer peripheral surface forming the arc portion of the concave portion 133b is set to be smaller than the radius of curvature of the contact surface forming the convex portion 133a.

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

At that time, the recess 133b is formed of an arc surface portion extending in the circumferential direction of the fixing bracket 133 and a slope portion connected to both ends of the arc surface portion and reaching the contact surface of the guide portion 133c. In the recess 133b, for example, when all the arc surface portions are fillet welded and the slope portions are not welded, the welded arc surface portions form the welded portion 133d. Further, for example, when the arc surface portions are welded at predetermined intervals by spot welding and the slope portions are not welded, the portions welded at each point form the welded portion 133d. Further, when only the above-mentioned two slope portions are spot-welded or fillet-welded and the arcuate surface portion is not welded, the spot-welded or fillet-welded portions form the welded portion 133d. The unwelded arc surface or slope, in other words, the arc or slope that does not need to be welded, may be in the welding range, as shown in FIG. 2 (b).

In such an example, it is assumed that all the contact surfaces of the four convex portions 133a abut on the inner peripheral surface 151b of the storage case 151, but it is not always necessary to do so, for example, the four convex portions. The entire contact surface of the portion 133a (guide portion 133c) does not have to be in contact with the inner peripheral surface 151b 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 so as to be on the circumference of a common virtual circle CI centered on the central axis CL of the rotor shaft 131. The radius of the virtual circle CI is set to, for example, the length from the central axis CL of the fixing bracket 133 concentrically with the rotor shaft 131 to the farthest portion. As a result, at the time of assembly, the fixing bracket 133 is fitted into the inner peripheral surface 151b of the housing case 151. The guide portion 133c has coaxiality (coaxiality, concentricity) between the accommodating case 151 and the female screw member 132 to such an extent that interference between the inner peripheral surface 151b of the accommodating case 151 and the rotating magnet rotor 141 can be prevented. ) Can 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 accommodation case 151. (Outer diameter of magnet rotor 141 <Diameter of virtual circle CI <Inner diameter of accommodation case 151). Further, as shown in FIG. 2 (c), the circumference of the central axis CL of the fixing bracket 133 is divided into four equal parts on the contact surface of the guide portion 133c that abuts on the inner peripheral surface 151b of the accommodation case 151. It is desirable that the intersection of the line and the virtual circle CI is located. 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 surface or the slope portion 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 by the welded portion 133d described later in a portion other than the guide portion 133c described above. .. As described above, the recess 133b is formed of an arc surface portion extending in the circumferential direction of the fixing bracket 133 and a slope portion connected to both ends of the arc surface portion and reaching the contact surface of the guide portion 133c. For example, as shown in FIG. 2 (b), in FIG. 2 (a), which is the portion closest to the central axis CL forming the concave portion 133b, the welded portion includes not only the arc surface portion but also the slope portion. The arc surface portion or the slope portion is the welded portion 133d. As a result, the bead formed on the welded portion 133d is formed in the region inside the virtual circle CI, not on the outside of the virtual circle CI, so that the bead may interfere with the inner peripheral surface 151b of the accommodation case 151. do not have.

It should be noted that the welded portion 133d cannot be provided inside from the inner diameter of the annular joint portion 111d of the valve body housing 111 shown by the broken line in FIG. 2A. This is because the fixing metal fitting 133 and the valve body housing 111 cannot come into contact with each other, and welding fixing becomes impossible.

In such a configuration, in assembling the above-mentioned motorized valve 100, first, a rotor shaft 131 assembled to each other, a needle case 125 to which the needle 121 is fixed, and the like are attached to the female screw member 132, and then then. The overhanging 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 peripheral edge of the open end of the valve body housing 111 to which the valve seat 112 or the like is pre-attached. To. Subsequently, for example, the arcuate surface portion of the recess 133b of the fixing bracket 133 and the peripheral edge of the open end portion of the valve body housing 111 are fixed by fillet welding by a first welding machine (not shown). As a result, the first bead is formed between the welded portion 133d, which is the welded arcuate surface portion, and the joint portion 111d of the valve body housing 111.

The radial gap between the overhanging portion 132B of the female screw member 132 and the open end portion of the valve body housing 111 may be set to be, for example, a crevice fit or a tight fit.

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 welding machine, and the assembled valve body housing 111 is used as a support base for the second welding machine. After being transferred to (not shown), the inner peripheral surface 151b of the accommodation case 151 to which the rotor support member 152 and the like are attached is the open 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 peripheral edge of the open end of the valve body housing 111 without a gap so as to abut on the contact surface of the guide portion 133c of the fixing bracket 133 on the peripheral edge. As a result, the axis of the accommodation case 151 and the axis of the rotor shaft 131 and the female screw member 132 are automatically aligned with each other.

Then, in the support base of the second welding machine, the accommodating case 151 and the valve body housing 111 having substantially the same outer diameter are gripped as a whole, so that the axial centers of the accommodating case 151 and the valve body housing 111 are aligned. Welding work is performed on the lower end surface of the housing case 151 and the joint portion 111d of the valve body housing 111 in a state of being in agreement with each other. As a result, a second bead is formed adjacent to the first bead described above on the lower end surface of the housing case 151 and the joint portion 111d of the valve body housing 111.

In this way, by providing the plurality of guide portions 133c (convex portions 133a) and the plurality of concave portions 133b on the outer periphery of the fixing bracket 133, for example, in the shape of a disk, the guide portions 133c can be formed 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 by the welded portion 133d formed in the recess 133b which is in contact with the abutting surface and does not abut on the inner peripheral surface 151b of the accommodation case 151. Since the formed weld bead does not interfere with the inner peripheral surface 151b of the accommodating case 151, the valve main body housing 111 and the accommodating case 151 are in close contact with each other without a gap, and can be 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 accommodation case 151, and the contact surfaces of all the guide portions 133c do not contact the inner surface of the accommodation case 151. The end of the accommodating case 151 and the end of the valve body housing 111 may be brought into close contact with each other to maintain the coaxiality between the fixing bracket 133 and the accommodating case 151. This is because, on the contact surface of the guide portion 133c, the amount of deviation between the axes of the housing case 151 and the valve body housing 111 does not hit the inner peripheral surface 151b of the housing case 151 when the magnet rotor 141 rotates. This is because it mechanically acts as a stopper to enter the range where it hits from the range, and prevents the storage case 151 from shifting.

It should be noted that the convex portions 133a (guide portions 133c) formed on the fixing bracket 133 are provided at four locations here, but since it is sufficient to maintain coaxiality with the storage case 151, the above conditions are satisfied and 2 It suffices if it is provided in a plurality of places more than the place. Hereinafter, the second to fourth embodiments (modifications) of the fixing bracket will be described with reference to FIGS. 3 (a) to 3 (c).

3A is a diagram showing another example of the shape of the fixing bracket, FIG. 3B is a diagram showing still another example of the shape of the fixing bracket, and FIG. 3C is a diagram showing another example of the shape of the fixing bracket. It is a figure which shows another example of the shape of a fixing metal fitting.

As shown in FIG. 3A, the fixing bracket 133A as the second embodiment has three convex portions 133Aa (hereinafter, also referred to as a guide portion 133Ac), and the convex portions 133Aa and the convex portions 133Aa on the circumference. Three recesses 133Ab are formed between the two. The three convex portions 133Aa are formed so as to be separated from each other at equal angular intervals, for example, 120 ° intervals. The width W of each convex portion 133Aa along the circumferential direction is set to be the same as each other. Further, the recesses 133Ab are formed so as to be separated from each other at equal angular intervals, for example, 120 ° intervals. The lengths of the arcuate surface portions forming the concave portions 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 abuts on the inner peripheral surface of the accommodation case 151 is a line obtained by dividing the circumference of the central axis CL of the fixing bracket 133A into three equal parts at an equal angle. , An intersection point is located where the virtual circle (a common circle in which each of the above-mentioned contact surfaces similar to the virtual circle shown in FIG. 2 (c) exists) intersects. As a result, the above-mentioned conditions for maintaining the coaxiality are satisfied.

At that time, the recess 133Ab is formed of an arc surface portion extending in the circumferential direction of the fixing bracket 133 and a slope portion connected to both ends of the arc surface portion and reaching the contact surface of the guide portion 133Aa. In the recess 133Ab, for example, when the arc surface portion is all fillet welded and the slope portion is not welded, the welded arc surface portion forms the welded portion 133Ad.

Further, as shown in FIG. 3B, the fixing bracket 133B as the third embodiment has a convex portion 133Ba1 having a narrow width W (hereinafter, also referred to as a guide portion 133Bc) and 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 convex portions 133Ba1 and the convex portion 133Ba2, concave portions 133Bb including an arcuate surface portion formed along the circumferential direction are formed at two locations. The lengths (surface areas) in the circumferential direction of the contact surface 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 abuts on the inner peripheral surface 151b of the accommodation case 151 is a line obtained by dividing the circumference of the central axis CL of the fixing bracket 133B into three equal parts at an equal angle. An intersection is located where the virtual circle (a common circle in which each of the above-mentioned contact surfaces similar to the virtual circle shown in FIG. 2 (c) exists) intersects. As a result, the above-mentioned conditions for maintaining the coaxiality are satisfied.

At that time, the recess 133Bb is formed of an arc surface portion extending in the circumferential direction of the fixing bracket 133 and a slope portion connected to both ends of the arc surface portion and reaching the contact surface of the guide portion 133Bc. In the recess 133Bb, for example, when all the arc surface portions are fillet welded and the slope portions are not welded, the welded arc surface portions form the welded portion 133Bd.

Further, as shown in FIG. 3C, the remaining portion other than the two convex portions 133Ca (hereinafter, also referred to as the guide portion 133Cc) formed opposite to each other in the fixing bracket 133C as the fourth embodiment has 2 The recesses 133Cb at the locations are formed so as to face each other. The contact surfaces of the two convex portions 133Ca are formed by arcuate surfaces having the same central angle as each other. The outer peripheral surfaces forming the two recesses 133Cb are formed from curved surfaces having the same shape as each other. Further, as shown in FIG. 3C, the contact surface of the guide portion 133Cc that abuts on the inner peripheral surface 151b of the accommodation case 151 is a line obtained by dividing the circumference of the central axis CL of the fixing bracket 133C into four equal parts at an equal angle. And the intersection with the virtual circle is located. As a result, the conditions for maintaining the coaxiality are satisfied.

At that time, the recess 133Cb is formed of a curved surface portion extending in the circumferential direction of the fixing bracket 133 and a slope portion connected to both ends of the curved surface portion and reaching the contact surface of the guide portion 133Ca. In the recess 133Cb, for example, when 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 bracket 133 shown in FIG. 2A was also used by using the fixing brackets 133A, 133B, 133C which are the second to fourth embodiments (modifications) of the fixing bracket 133. As in the case, the valve main body housing 111 and the accommodating case 151 are in close contact with each other without a gap, and the coaxiality is maintained.

As described above, according to the electric valve 100 of the first embodiment of the present invention, by providing a plurality of guide portions 133c and a plurality of welded portions 133d along the outer periphery of the fixing bracket 133, the welded portion can be formed. Preventing interference between the weld bead and the containment case 151 that may occur, the valve body housing 111 and the containment case 151 can be in close contact with each other without gaps, and can be fixed while maintaining coaxiality, reducing manufacturing control. Can be made possible.

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

When driving the motorized valve 100, first, a drive pulse signal is given to the stator. As a result, the magnet rotor 141 rotates according to the number of pulses, and the rotor shaft 131 rotates accordingly. The rotor shaft 131 is screwed between the male screw portion 131a of the rotor shaft 131 and the female screw portion 132b of the female screw member 132. Moves along the central axis CL while rotating.

When the motorized valve 100 is closed, it is necessary to move the rotor shaft 131 downward. When the rotor shaft 131 further moves downward after the needle 121 comes into contact with the valve seat 112, the valve spring 122 contracts via the spring receiver 123, and the needle 121 is valved by the load due to the reaction force of the valve spring 122. Pressed by the seat 112, the motorized 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 receiver 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 highly slippery spring receiver 123. Therefore, since the rotating rotor shaft 131 slides and slides with the spring receiver 123, the transmission of rotation to the needle case 125 and the needle 121 is suppressed. As a result, wear of the needle 121 and the valve port 112a is suppressed. Further, since the rotor shaft 131 is pushed in, the washer 124 is lowered together with the flange portion 131b of the rotor shaft 131, so that the upper surface of the washer 124 is not in contact with the lower end surface of the open end portion 125a of the needle case 125, and the needle case 125 The rotation also stops.

Subsequently, when returning the motorized valve 100 from the valve closed state to the valve open state, it is necessary to rotate the rotor shaft 131 in the reverse direction to move it upward. As the rotor shaft 131 rises, the valve spring 122 extends via the spring receiver 123. At this time, the needle 121 holds the contact state with the valve seat 112. Further, when the rotor shaft 131 moves upward, the flange portion 131b of the rotor shaft 131 comes into contact with 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 to the needle case 125 also moves upward, the needle 121 and the valve port 112a of the valve seat 112 are not in contact with each other, and the motorized valve 100 is controlled to the valve open state.

At this time, since the needle case 125 and the needle 121 are driven by the rotor shaft 131 via the highly slippery washer 124, the rotation of the rotor shaft 131 is suppressed from being transmitted to the needle case 125 and the needle 121. To. As a result, wear of the needle 121 and the valve port 112a is suppressed.

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

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

As shown in FIGS. 4 and 5, the configuration of the motorized valve 200 differs from the configuration of the motorized valve 100 having the fixing bracket 133 in that the female screw member 233 is provided with the insert-molded edge-stepped fixing bracket 233. More specifically, the outer peripheral portion of the metal rough disk-shaped rimmed fixing bracket 233 has a contact surface that abuts on the inner peripheral surface 151b of the storage case 151, and is convex outward. A stepped portion composed of a portion 233a (hereinafter, also referred to as a guide portion 233c), a recessed portion 233b forming a gap in a portion surrounded by the inner peripheral surface 151b of the accommodating case 151 and the upper end surface of the valve body housing 111. Have. FIG. 5 shows a part of the upper end surface (joint portion 111d) of the valve body housing 111 forming the recess 233b and a part of the lower end portion of the rimmed fixing bracket 233 supported on the upper end surface of the valve body housing 111. As shown, the weld 233d will be formed.

Since the other configurations of the motor-operated valve 200 are the same as the configuration of the motor-operated valve 100 described above, the same reference numerals are given to the same components, and the duplicate description thereof will be omitted.

As shown in FIGS. 4 and 5, the stepped portion of the above-mentioned edge-stepped fixing bracket 233 is formed in the thickness direction along the central axis CL of the motorized valve 200. The recess 233b, which is a portion close to the central axis CL, is formed on the valve body housing 111 side, which is the lower side of the fixing bracket 233, because the lower end surface of the fixing bracket 233 is fillet welded to the joint portion 111d of the valve body housing 111. Will be done. Further, since the contact surface of the guide portion 233c, which is a portion farther from the central axis CL than the recess 233b, comes into contact with the inner peripheral surface 151b of the storage case 151, it is formed on the storage case 151 side which is the upper side of the fixing bracket 233. ..

Here, it is not always necessary that all the contact surfaces of the convex portions 233a come into contact with the inner peripheral surface 151b of the accommodation case 151.

As a condition of the guide portion 233c, the edge-stepped fixing bracket 233 is accommodated so that the contact surface of the guide portion 233c abuts on the inner peripheral surface 151b of the accommodation case 151, as in the first embodiment. It is fitted into the inner peripheral surface 151b of the case 151. If the guide portion 233c can maintain the coaxiality (coaxiality, concentricity) between the accommodating case 151 and the valve body housing 111 to such an extent that the inner peripheral surface of the accommodating case 151 and the rotating magnet rotor 141 can be prevented from interfering with each other. good. Therefore, the diameter of the contact surface of the guide portion 233c described above 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 accommodation case 151 (magnet rotor 141). Outer diameter <diameter of contact surface <inner diameter of storage case 151).

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

It is not necessary that all of the recesses 233b are welded portions 233d, and a part of the recesses 233b may be welded, or the recesses 233b may be welded and fixed by a plurality of spot welds or a plurality of spot fillet welds. May be.

The welded portion 233d cannot be provided inside the inner diameter of the annular 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 welding fixing becomes impossible. Further, the welded portion 233d needs to be formed at a position where the weld bead 233w generated by welding with the valve body housing 111 does not interfere with the accommodation case 151.

Further, the convex portion 233a may be continuously provided on the entire circumference, or may not be continuous on the entire circumference, and of course, the convex portion 233a may be interrupted in a plurality of portions in the middle. In such a case, on the contact surface of the guide portion 233c, at least a line (an integer of N = 3 or more) obtained by dividing the circumference of the central axis of the fixing bracket into N equal parts at an equal angle is shown in FIG. 2 (c). It is assumed that the intersection of the virtual circle and the similar virtual circle is located.

However, when the convex portion 233a is provided on the entire circumference, the convex portion 233a is circular, so that it is easy to manufacture, and the manufacturing man-hours can be reduced.

Further, the present embodiment can be taken as the following embodiment, and such an embodiment is also the scope of the present invention. For example, a disk serving as a guide is formed on the edged fixing bracket on the accommodation case 151 side, and a small disk having a diameter smaller than this disk is integrally integrated with a large disk on the valve body housing 111 side. A welded portion is formed on the small disk.

As described above, the motorized valve 200 of the second embodiment of the present invention also has the same effect as that of 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 a metal material, but the present invention is not limited to this, and for example, a thermoplastic resin or the like capable of welding is used. May be. Further, although the fixing metal fittings 133 and 233 have been described as having a disk shape, the fixing metal fittings 133 and 233 are not limited to this, and as shown in FIG. 7, the fixing metal fittings 333 have other shapes such as a polygon such as a hexagon. It is also possible to use a plate material having.

As described above, according to the present invention, in order to solve the above-mentioned conventional problems, it is possible to maintain the coaxiality when fixing the valve body housing and the accommodation case with a simple structure of the parts. It is possible to provide an electric valve that enables reduction of manufacturing control and a refrigeration cycle system including the electric valve.

CL center axis 11 1st joint 12 2nd joint 100, 200 Electric valve 110 Valve body 111 Valve body housing 111A Valve chamber 111b 1st port 111c 2nd port 111d Joint 112 Valve seat 112a Valve port 120 Needle Part 121 Needle 122 Valve spring 123 Spring receiving 123a Spring engaging part 124 Washer 125 Needle case 125a Open end 130, 230 Rotor shaft rotating part 131 Rotor shaft 131a Male threaded part 131b Flange part 132, 232 Female threaded member 132A, 232A Guide chamber 132b , 232b Female threaded portion 132c, 232c Pressure equalizing hole 133, 133A, 133B, 133C, 233 fixing bracket 133a, 133Aa, 133Ba1, 133Ba1, 133Ca, 233a Convex part 133b, 133Ab, 133Bb, 133Cb, 233b, Concave part 133c, 133Ac, 133B, 133Cc, 233c Guide part 133d, 133Ad, 133Bd, 133Cd, 233d Welded part 140 Rotor shaft drive part 141 Magnet rotor 141A Rotor chamber 141b Engagement protrusion 142 Rotor fixing member 143 Rotating stopper spring 144 Movable stopper member 150 Exterior part 151 151a Dimple 152 Rotor support member 152a Umbrella-shaped part 152b Cylindrical part 152c Engagement recess 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 (13)

A valve chamber that movably accommodates a valve body unit including a valve body that communicates with at least one connection port connected to a fluid conduit and controls the opening and closing of the valve port of the valve seat provided at the connection port. With valve body housing and
The valve body is close to or close to the valve port of the valve seat so as to adjust the flow rate of fluid passing between the end of the valve body and the peripheral edge of the valve port of the valve seat to the valve body unit. An electromagnetic actuator comprising a rotor shaft and a magnet rotor that actuates a drive mechanism that performs a separable control operation.
A female screw member that guides the valve body unit and rotatably supports the rotor shaft,
An open end of the valve body housing that has an outer peripheral edge portion that protrudes from the outer peripheral portion of the female screw member in a direction orthogonal to the central axis of the rotor shaft, is fixed to the female screw member, and the lower portion of the female screw member is inserted. A fixing bracket that fixes the female screw member by being welded to the peripheral edge of the portion,
A housing case for accommodating the rotor shaft and magnet rotor of the electromagnetic actuator, the female screw member, and the fixing bracket is provided.
The fixing bracket is formed on the outer peripheral edge portion so as to be concentric with the central axis of the housing case, and has a contact surface protruding toward the inner peripheral surface of the housing case. A plurality of guide portions formed at equal intervals along the direction, and a plurality of guide portions inward in the central axis direction of the contact surface of the guide portions between the plurality of guide portions. An electric valve having a welded portion formed in a concave portion recessed in the central axis direction of the valve body, and having a welded portion welded and fixed to the upper surface of an open end portion of the valve body housing. The motorized valve according to claim 1, wherein all of the contact surfaces of the plurality of guide portions are in contact with the inner peripheral surface. The contact surface of the guide portion is formed so as to be 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. Therefore, it is set to be smaller than the inner diameter of the inner peripheral surface of the accommodating case, and only the contact surface of a part of the guide portions in the plurality of guide portions abuts on the inner peripheral surface. The electric valve according to claim 1, wherein the electric valve is characterized. The contact surface of the guide portion is formed so as to be 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. The first aspect of the present invention is that the contact surface is set to be smaller than the inner diameter of the inner peripheral surface of the accommodating case, and all of the contact surfaces in the plurality of guide portions do not abut on the inner peripheral surface. The described electric valve. At least, the intersection of the line (an integer of N = 3 or more) obtained by dividing the circumference of the central axis of the fixing bracket into N equal parts at an equal angle and the virtual circle is located on the contact surface of the guide portion. 3. The electric valve according to claim 3 or 4 . Claim 1 to claim 1, wherein at least one of the contact surfaces of the plurality of guide portions in the fixing bracket is an arc surface extending along the inner peripheral surface of the accommodation case. 5. The electric valve according to any one of 5 . A valve chamber that movably accommodates a valve body unit including a valve body that communicates with at least one connection port connected to a fluid conduit and controls the opening and closing of the valve port of the valve seat provided at the connection port. With valve body housing and
The valve body is close to or close to the valve port of the valve seat so as to adjust the flow rate of fluid passing between the end of the valve body and the peripheral edge of the valve port of the valve seat to the valve body unit. An electromagnetic actuator comprising a rotor shaft and a magnet rotor that actuates a drive mechanism that performs a separable control operation.
A female screw member that guides the valve body unit and rotatably supports the rotor shaft,
It has an outer peripheral edge portion whose outer diameter is different in size from the outer peripheral portion of the female screw member in a direction orthogonal to the central axis of the rotor shaft, and is lower than the outer diameter of the upper outer peripheral edge portion on the upper side of the outer peripheral edge portion. The outer diameter of the lower outer peripheral edge on the side is smaller, and the female screw member is fixed to the female screw member and welded to the upper surface of the open end portion of the valve body housing into which the lower portion of the female screw member is inserted. Fixing bracket with edge step to fix,
The rotor shaft and magnet rotor of the electromagnetic actuator, the female screw member, and a storage case for accommodating the edge-stepped fixing bracket are provided.
The edge-stepped fixing bracket is formed concentrically with the central axis of the housing case, and has a guide portion which is an upper and outer peripheral edge portion having a contact surface protruding toward the inner peripheral surface of the housing case. The guide portion is located below the guide portion, which is a portion surrounded by the inner peripheral surface of the storage case and the upper surface of the open end portion of the valve body housing and faces the recess recessed in the direction along the central axis. A welded portion integrally formed with the valve body, which is welded and fixed to the upper surface of the open end portion of the valve body housing, which is closer to the central axis of the rotor shaft than the contact surface of the guide portion . An electric valve characterized by having a welded portion provided on the outer peripheral surface of the lower outer peripheral edge portion . The motorized valve according to claim 7, wherein all of the contact surface of the guide portion abuts on the inner peripheral surface. The contact surface of the guide portion is formed so as to be 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. The present invention is characterized in that it is set to be smaller than the inner diameter of the inner peripheral surface of the accommodating case, and only a part of the abutting surface in the abutting surface abuts on the inner peripheral surface. 7. The electric valve according to 7. The contact surface of the guide portion is formed so as to be 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. The seventh aspect of claim 7, wherein the contact surface is set to be smaller than the inner diameter of the inner peripheral surface of the accommodating case, and all of the contact surfaces in the guide portion do not abut on the inner peripheral surface. Electric valve. When the edge-stepped fixing bracket has a plurality of guide portions, at least a line (N = 3 or more) obtained by dividing the circumference of the central axis of the fixing bracket into N equal parts at an equal angle on the contact surface of each guide portion. The electric valve according to claim 9 or 10 , wherein the intersection of the virtual circle and the above-mentioned virtual circle is located. The welded portion is welded and fixed to the upper surface of the open end portion of the valve body housing by a plurality of spot welds, a plurality of spot-shaped fillet welds separated from each other, or a continuous fillet weld. The electric valve according to any one of claims 1 to 11, wherein the electric valve is characterized. Equipped with an evaporator, a compressor, and a condenser,
The refrigerating cycle system according to any one of claims 1 to 12 , wherein the electric valve is provided in a pipe arranged between an outlet of the condenser and an inlet of the evaporator.

Images