CN108571598A - Motor-driven valve and refrigerating circulation system - Google Patents

Abstract

The present invention provides an electric valve (100). In an electric valve formed by assembling a support member (2) and a closed casing (3) relative to a valve casing (1), the wall thickness of the parts of the valve casing (1) is changed. The thinness makes the processing of the fixing metal part (23) of the support member (2) and the airtight casing (3) easy and realizes miniaturization. The support member (2) consists of a base (21) inserted into the opening of the cylinder of the valve housing (1), a bracket portion (22), and an outer periphery of the base (21) and is inserted into the The fixed metal parts (23) of the inner circumference of the valve housing (1) constitute. The base (21) and the fixing metal part (23) are inserted or pressed into the inner side of the valve housing (1) along the axis L direction. In this state, the fixing metal part (23) and the valve housing (1) are fixed by welding or the like.

Description

Electric valve and refrigeration cycle system

technical field

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

Background technique

Conventionally, as such an electric valve, there is, for example, an electric valve disclosed in JP-A-2016-89870 (Patent Document 1). In this electric valve, the magnetic rotor of the stepping motor and the rotation of the rotor shaft move the rotor shaft and the valve member forward and backward through the screw feed mechanism, so that the opening of the valve port is controlled by the valve member. And, the rotor shaft is supported by the supporting member. In addition, in such an electric valve, the flow path of the fluid needs to be closed, and the magnetic rotor of the motor unit is accommodated in a cylindrical airtight case (tank) that forms a sealed structure together with the valve case as the valve main body. Furthermore, the support member and the airtight casing are assembled to the valve case and fixed by welding or the like.

prior art literature

Patent Document 1: Japanese Patent Laid-Open No. 2016-89870

Contents of the invention

The problem to be solved by the invention

FIG. 8 is a view showing the fixing structure of the support member and the airtight casing in the above-mentioned conventional electric valve, and the symbol L in the figure is an axis that becomes the center of the valve casing 10 and the support member 20 . In this prior art, a part of the support member 20 is inserted into the opening of the valve housing 10 and the fixing metal fitting 20 a is brought into contact with the end surface 10 a around the opening of the valve housing 10 . Then, the contact portion between the fixing metal fitting 20a and the valve housing 10 is fixed by welding. Furthermore, the airtight casing 30 is also fixed to the end surface 10a of the opening of the valve housing 10 by welding.

In this way, in the prior art, the same end face around the opening of the valve casing is used as the receiving surface and the support member and the airtight casing are fixed by welding, so it is necessary to ensure that the fixed metal parts are placed on the end surface around the opening of the valve casing. area. Therefore, the thickness of the parts of the valve casing becomes thick, and there are the following problems. When the valve housing is manufactured by press working, since the thickness of the parts becomes larger, the processing load becomes larger, the difficulty of processing becomes higher, product management becomes difficult, and the cost becomes higher. Also, as a pressure vessel, a larger amount of material than necessary is required. In addition, the external dimensions of the valve case increase in accordance with the increase in the thickness of the components.

An object of the present invention is to improve the arrangement of fixing metal parts of the support member and reduce the increase in the thickness of the valve main body in an electric valve in which a support member that supports the rotor shaft on the axis is assembled with respect to the valve body.

The motor-operated valve of Plan 1 controls the opening of the valve port by moving the valve part forward and backward by the rotation of the rotor shaft of the motor part, and is assembled on the axis with respect to the cylindrical metal valve body in which the above-mentioned valve part is built. The electric valve is characterized in that the support member has a base inserted into the opening of the cylinder of the valve body, and is provided on the outer periphery of the base and is inserted into the base together with the base. The fixing metal fittings on the inner periphery of the valve body are fixed to the fixing metal fittings in a state where the fixing metal fittings are inserted into the inside of the valve body in the axial direction and part of the fixing metal fittings are exposed from the valve body. Fix with the above valve body.

An electric valve according to claim 2 is characterized in that, in the electric valve according to claim 1 , at least one of the base portion of the support member and the fixing metal fitting is press-fitted into the valve main body.

The electric valve according to claim 3 is characterized in that, in the electric valve described in claim 1, the valve main body has a large-diameter portion on the opening side, a small-diameter portion smaller in diameter than the large-diameter portion, and an opening from the large-diameter portion. The base portion of the support member is press-fitted into the small-diameter portion of the valve body up to the tapered portion where the small-diameter portion is reduced in diameter.

The electric valve of claim 4 is characterized in that, in the electric valve described in any one of claims 1 to 3, the above-mentioned fixed metal part is composed of an annular disk-shaped flat plate centered on the above-mentioned axis, and from the outer periphery of the above-mentioned flat plate. The side part extending parallel to the said axis|shaft is comprised, and the said side part is provided in the outer periphery of the said base part.

The electric valve of claim 5 is characterized in that, in the electric valve described in any one of claims 1 to 4, the base of the support member is made of resin, and the support member is embedded with the fixed metal part and the base. formed parts.

An electric valve according to claim 6 is characterized in that, in the electric valve described in any one of claims 1 to 5, the fixing metal fitting and the valve main body are fixed by welding.

The refrigerating cycle system of claim 7 includes a compressor, a condenser, an expansion valve, and an evaporator, and the refrigerating cycle system is characterized in that the electric valve described in any one of claims 1 to 6 is used as the expansion valve.

The effects of the invention are as follows.

According to the electric valves of the schemes 1 to 6, since the support member and the fixed metal parts are inserted in the axial direction relative to the valve body, there is no need to provide a space for arranging the fixed metal parts on the end face of the opening of the valve body, so that it is not necessary to make the valve The parts of the main body (plates, etc.) become thicker. Therefore, processing of the valve main body becomes easy and product management becomes easy, and more materials than necessary are not required, thereby enabling cost reduction. In addition, the external dimensions of the valve main body can be reduced.

According to the electric valve of claim 2, since at least one of the base of the support member and the fixing metal fitting is press-fitted into the valve body, the centering of the support member with respect to the valve body becomes accurate and the assembly operation becomes easy.

According to the electric valve of claim 3, since the base of the support member is pressed into the small-diameter portion of the valve body, when assembling the support member, the base is guided by the tapered portion to be pressed into the small-diameter portion, and the assembly work becomes easier. easy.

According to the electric valve according to claim 4, since the fixing metal part is formed in a shape in which the base is roughly covered by the annular plate-shaped flat part and the side part, the fixing metal part matches the base, and the firmness of the base can be ensured by using the fixing metal part. .

According to the electric valve of claim 5, since the supporting member is formed by insert-molding the fixing metal part and the base, handling of the supporting member becomes easy during assembly.

According to the electric valve according to the sixth aspect, the metal parts and the valve main body can be firmly fixed.

According to the refrigeration cycle system of Embodiment 7, the same effects as those of Embodiments 1 to 6 are obtained.

Description of drawings

Fig. 1 is a longitudinal sectional view of an electric valve according to a first embodiment of the present invention.

Fig. 2 is an enlarged cross-sectional view of a fixing metal part in the electric valve according to the first embodiment.

3 is an enlarged cross-sectional view of an assembled portion of a valve casing, a support member, and a sealing case in the electric valve according to the first embodiment.

4 is an enlarged cross-sectional view of an assembled portion of a valve housing, a support member, and a sealing case in an electric valve according to a second embodiment.

5 is an enlarged cross-sectional view of an assembled portion of a valve housing, a support member, and a sealing case in an electric valve according to a third embodiment.

6 is an enlarged cross-sectional view of an assembled portion of a valve case, a support member, and a sealing case in an electric valve according to a fourth embodiment.

Fig. 7 is a diagram showing a refrigeration cycle system according to an embodiment.

Fig. 8 is an enlarged cross-sectional view of an assembled portion of a valve case, a support member, and an airtight casing in a conventional electric valve.

In the picture:

1—valve housing (valve body), 1a—annular end face, 1R—valve chamber, 11—first joint pipe, 12—second joint pipe, 13—valve seat ring, 13a—valve port, 2—supporting part, 2a—internal thread, 2b—guide hole, 21—base, 22—bracket, 23—fixed metal parts, 231—flat plate, 23—both sides, 3—airtight casing, 4—stepping motor (motor part ), 41—rotor shaft, 41a—external thread part, 42—magnetic rotor, 43—stator coil, 5—needle valve (valve component), 6—valve frame, P—melting and solidifying part, Q—melting and solidifying part, 1 ′—valve housing (valve body), 1A—large diameter portion, 1B—small diameter portion, 1C—tapered portion, 21′—base portion, 232′—side portion, 21″—base portion, L—axis axis, 100—electric valve , 200—outdoor heat exchanger, 300—indoor heat exchanger, 400—flow switching valve, 500—compressor.

Detailed ways

Next, embodiments of an electric valve and a refrigeration cycle system according to the present invention will be described with reference to the drawings. Fig. 1 is a longitudinal sectional view of the electric valve according to the first embodiment, Fig. 2 is an enlarged cross-sectional view of a fixed metal part in the electric valve according to the first embodiment, and Fig. 3 is a valve housing and a support member in the electric valve according to the first embodiment and an enlarged cross-sectional view of the assembled portion of the airtight enclosure. In addition, the concept of "up and down" in the following description corresponds to the up and down in FIG. 1 .

The electric valve 100 includes a valve casing 1 as a "valve main body", a support member 2, an airtight casing 3, a stepping motor 4 as a "motor part", a needle valve 5 as a "valve member", and a valve frame 6.

The valve housing 1 is formed into a substantially cylindrical shape, for example, from metal such as brass and stainless steel, and has a valve chamber 1R inside. A first joint pipe 11 that communicates with the valve chamber 1R is connected to one side of the outer periphery of the valve case 1 , and a second joint pipe 12 is connected to a cylindrical portion extending downward from the lower end. Furthermore, a seat ring 13 is fitted on the valve chamber 1R side of the second joint pipe 12 . The inner side of the seat ring 13 serves as a valve port 13a, and the second joint pipe 12 communicates with the valve chamber 1R through the valve port 13a. In addition, the first joint pipe 11 , the second joint pipe 12 , and the seat ring 13 are fixed to the valve housing 1 by brazing or the like.

The supporting member 2 has a base 21 partially inserted into the valve housing 1 , a bracket 22 standing upright from the base 21 toward the center of the stepping motor 4 side, and fixing metal fittings 23 . The base portion 21 and the stand portion 22 are made of resin. As shown in FIG. 2 , the fixed metal parts 23 are formed by press working of a metal plate such as brass or stainless steel, and are formed in a rotated shape obtained by rotating the illustrated cross-sectional shape (hatched portion) around the axis L. body shape. The fixing metal fitting 23 is composed of an annular plate-shaped flat portion 231 centered on the axis L, and a thin cylindrical side portion 232 extending parallel to the axis L from the outer periphery of the flat portion 231 . Furthermore, the fixing metal part 23 is provided integrally with the base part 21 and the bracket part 22 made of resin by insert molding. Accordingly, a part of the flat plate portion 231 is provided inside the base portion 21 , and the side surface portion 232 is provided on the outer periphery of the base portion 21 .

Furthermore, as will be described below, the support member 2 is assembled to the valve case 1 and fixed to the upper end portion of the valve case 1 by welding via a fixing metal fitting 23 . In addition, in this embodiment, fixing is performed by welding, but it may be fixed by brazing or the like, or by adding a fixing member for fixing the support member 2 to the valve case 1 and fixing by an appropriate method such as caulking. In addition, an internally threaded portion 2a coaxial with the axis L and its threaded hole are formed at the center of the supporting member 2, and a cylindrical guide hole 2b having a larger diameter than the threaded hole of the internally threaded portion 2a is formed.

The airtight casing 3 is formed in an approximately cylindrical shape with its upper end blocked, and is airtightly fixed to the upper end of the valve casing 1 by welding. A guide holding cylinder 31 is fitted in the upper portion of the airtight casing 3, and a guide 32 is fitted in a central cylinder portion 31a of the guide holding cylinder 31. The guide 32 has a guide hole 32a in the center. A movable stopper 34 for assembling the helical guide wire body 33 and screwing with the helical guide wire body 33 is provided on the outer periphery of the cylindrical portion 31 a.

The stepping motor 4 includes a rotor shaft 41, a magnetic rotor 42 rotatably disposed inside the airtight case 3, a stator coil 43 disposed on the outer periphery of the airtight case 3 to face the magnetic rotor 42, and other not-shown components. Yoke, exterior parts, etc. The rotor shaft 41 is attached to the center of the magnetic rotor 42 via a bush 421 , and an external thread portion 41 a is formed on the outer periphery of the rotor shaft 41 on the side of the supporting member 2 . Furthermore, the external thread portion 41 a is screwed to the internal thread portion 2 a of the support member 2 . Thus, the support member 2 supports the rotor shaft 41 on the axis L. As shown in FIG. Furthermore, the upper end portion of the rotor shaft 41 is rotatably fitted in the guide hole 32 a of the guide 32 .

The needle valve 5 has a needle-like portion 51 inserted into the valve port 13 a and a protrusion 52 , and the protrusion 52 is fixed to the lower end of the valve frame 6 .

The valve holder 6 is a cylindrical member, and is fitted in the guide hole 2 b of the support member 2 so as to be slidable in the axis L direction. In the valve holder 6 , a spring seat 61 is provided so as to be movable in the direction of the axis L, and a compression coil spring 62 is mounted between the spring seat 61 and the needle valve 5 in a state where a predetermined load is applied thereto. The upper end of the valve frame 6 is engaged with the lower end of the rotor shaft 41 in the guide hole 2 b of the support member 2 , and the valve frame 6 and the needle valve 5 are rotatably supported by the rotor shaft 41 .

With the above structure, the magnetic rotor 42 and the rotor shaft 41 are rotated by the drive of the stepping motor 4, and the rotor shaft 41 is screwed by the screw feed mechanism of the external thread portion 41a of the rotor shaft 41 and the internal thread portion 2a of the supporting member 2. Move along the axis L. Further, the needle valve 5 moves in the axis L direction to approach or separate from the seat ring 13 . Thus, the opening degree of the valve port 13 a is controlled, and the flow rate of the refrigerant flowing from the first joint pipe 11 to the second joint pipe 12 or from the second joint pipe 12 to the first joint pipe 11 is controlled.

In addition, a protrusion 42a is formed on the magnetic rotor 42, and the protrusion 42a pushes the movable stopper 34 to rotate as the magnetic rotor 42 rotates, so that the movable stopper 34 is screwed together with the helical guide wire body 33. Move up and down while turning. Furthermore, the movable stopper 34 limits the position of the lowermost end of the rotor shaft 41 (and the magnetic rotor 42 ) by abutting against the lower end stopper 33 a of the helical guide wire body 33 . Further, the movable stopper member 34 limits the uppermost end position of the rotor shaft 41 by abutting against the upper end stopper 31 b of the guide holding cylinder 31 .

In this way, the electric valve 100 is an electric valve that controls the opening degree of the valve port 13a by moving the needle valve 5 (valve member) forward and backward by the rotation of the rotor shaft 41 of the stepping motor 4 (motor part), and is compared with the built-in needle valve. The metal valve case 1 (valve main body) having a cylindrical shape of the valve 5 is formed by assembling the support member 2 that supports the rotor shaft 41 on the axis L. As shown in FIG.

In addition, as described above, the lowermost end position of the rotor shaft 41 (and the magnetic rotor 42 ) is restricted by the abutment of the movable stopper member 34 on the side of the airtight case 3 against the lower end stopper 33 a , but in the assembly of the airtight case 3 as shown below. First, when attaching the assembly including the rotor shaft 41 and the like to the support member 2 to the valve housing 1, the support member 2 is adjusted relative to the valve housing 1 so that the positional relationship between the needle valve 5 and the valve port 13a becomes a predetermined condition. Adjust the amount of pressing. Furthermore, in a state where the rotor shaft 41 (and the magnetic rotor 42 ) is at the lowest end position and the movable stopper 34 is in contact with the lower end stopper 33 a , the movable stopper 34 is in contact with the magnetic rotor. The airtight case 3 is assembled at a position corresponding to the protruding portion 42a of 42 .

In the first embodiment, as shown in FIG. 3 , the side surface 232 of the fixing metal fitting 23 of the supporting member 2 is pressed or inserted to a predetermined position inside the valve housing 1 in the direction of the axis L, and the fixing metal fitting 23 is Part of the outer peripheral surface of the side surface portion 232 is exposed from the annular end surface 1 a of the valve housing 1 . Then, at this predetermined position, the inner corner formed by the annular end surface 1a of the valve housing 1 and the exposed outer peripheral surface of the side surface 232 is welded to form the molten and solidified portion P. In this way, since the inner corner portion is welded, it is possible to irradiate, for example, a welding laser or the like in a direction inclined with respect to the axis L. FIG. Therefore, there is no need to perform welding from directly above the annular end surface 1 a, and the welding can be easily performed without being hindered by components such as the magnetic rotor 22 provided on the upper portion of the valve housing 1 . In addition, in the outermost periphery of the annular end surface 1a of the valve casing 1, the opening end of the lower end of the airtight casing 3 is abutted, and the entire circumference of the abutting portion is welded to form a molten and solidified portion Q around the entire circumference. Thereby, the support member 2 and the airtight casing 3 are fixed to the valve housing 1 .

4 is an enlarged cross-sectional view of an assembled portion of a valve housing, a support member, and a sealing case in an electric valve according to a second embodiment. The second embodiment differs from the first embodiment in that the diameter of a part of the base 21 ′ of the support member 2 is the same as the outer diameter of the side surface 232 of the fixing metal fitting 23 , and the other structures are the same as in FIG. 1 . In addition, in the following second to fourth embodiments, the same elements as those of the first embodiment and corresponding elements are assigned the same symbols as in FIGS. 1 to 3 , and redundant descriptions and diagrams of the overall structure are omitted. Show.

In this second embodiment, the side surface portion 232 and the base portion 21' of the fixing metal fitting 23 of the support member 2 are pressed or inserted up to a predetermined position inside the valve case 1 in the direction of the axis L, and the side surface of the fixing metal fitting 23 A part of the outer peripheral surface of the portion 232 is exposed from the annular end surface 1 a of the valve housing 1 . Then, at this predetermined position, the inner corner formed by the annular end surface 1a of the valve housing 1 and the exposed outer peripheral surface of the side surface 232 is welded to form the molten and solidified portion P. In this second embodiment, the base 21' made of resin functions as a guide and is initially pressed or inserted into the valve housing 1, thereby facilitating assembly work.

5 is an enlarged cross-sectional view of an assembled portion of a valve housing, a support member, and a sealing case in an electric valve according to a third embodiment. The third embodiment differs from the second embodiment in that the outer diameter of the side surface portion 232' of the fixing metal fitting 23 is slightly smaller than the outer diameter of the base portion 21', and the other structures are the same as those of the second embodiment.

In this third embodiment, the base portion 21 ′ of the support member 2 is pressed in the direction of the axis L up to a predetermined position inside the valve case 1 , and the side portion 232 ′ of the fixing metal fitting 23 is inserted in the direction of the axis L up to the valve housing 1 . The specified position inside the case 1. Furthermore, a part of the outer peripheral surface of the side surface portion 232 ′ of the fixing metal fitting 23 is exposed from the annular end surface 1 a of the valve housing 1 . Then, at the predetermined position, the inner corner formed by the annular end surface 1a of the valve casing 1 and the exposed outer peripheral surface of the side surface 232' is welded to form the molten and solidified portion P. In this third embodiment, the base 21' made of resin functions as a guide, and only the base 21' is pressed into the valve case 1, so that it is easier to assemble the supporting member 2 than in the second embodiment, As a result, the assembly work becomes easier.

6 is an enlarged cross-sectional view of an assembled portion of a valve case, a support member, and a sealing case in an electric valve according to a fourth embodiment. This fourth embodiment differs from the third embodiment in that the diameter of the base portion 21″ of the supporting member 2 is smaller than the outer diameter of the side portion 232′ of the fixing metal part 2 and the shape of the valve housing 1′. Other configurations It is the same as the third embodiment.

The valve housing 1' in the fourth embodiment is configured to have a large-diameter portion 1A having the same diameter as the valve housing 1 in the first embodiment, a small-diameter portion 1B having a diameter smaller than the diameter of the large-diameter portion 1A, and The tapered portion 1C is reduced in diameter from the small diameter portion 1A to the small diameter portion 1B. In addition, the shape of the valve housing 1' is a rotating body obtained by rotating the cross-sectional shape (hatched portion) in FIG. 11 other than the fitting hole) shape.

In this fourth embodiment, the base portion 21″ of the supporting member 2 is pressed in the direction of the axis L up to a predetermined position inside the small-diameter portion 1B of the valve case 1′, and the side portion 232′ of the fixing metal fitting 23 is inserted along the axis L. The direction is inserted until a predetermined position inside the large-diameter portion 1A. And, a part of the outer peripheral surface of the side surface portion 232 ′ of the fixed metal fitting 23 is exposed from the annular end surface 1 a of the valve casing 1. And, at the predetermined position, the The inner corner formed by the annular end face 1a of the valve housing 1' and the exposed outer peripheral surface of the side part 232' is welded to form the melting and solidification part P. In this fourth embodiment, the tapered part 1C is relatively opposite to the resin The base part 21 " made of the base part 21 " acts as a guide, and the base part 21 " can be guided by the tapered part 1C to be pressed into the small-diameter part 1B, so that the support member 2 can be easily assembled, and the assembly operation becomes easier. And, Since the tapered portion 1C makes it easy to form a gap in the valve housing 1 and above the small-diameter portion 1B, the burr generated when the base portion 21 is pressed in can be contained in the gap without affecting welding, etc. In addition, when providing such a slit, it does not need to be inclined like the tapered portion 1C. For example, a step or the like may be provided in the valve case 1 .

According to the above embodiments, since the support member 2 and the fixing metal part 23 are inserted in the direction of the axis L with respect to the valve casing 1, 1', there is no need to provide an arrangement on the annular end surface 1a of the valve casing 1, 1'. Space for fixing metal parts. Thereby, it is not necessary to thicken the plate material etc. which are used for forming the valve case 1, 1'. Therefore, processing of the valve casings 1, 1' becomes easy and product management becomes easy. In addition, no more materials than necessary are required, so that costs can be reduced. Furthermore, the external dimensions of the valve casings 1, 1' can be reduced. Furthermore, at least one of the bases 21 , 21 ′, 21 ″ of the support member 2 and the fixing metal fitting 23 is press-fitted into the valve case 1 , so that the centering of the support member 2 with respect to the valve case 1 becomes accurate.

And, since the fixing metal part 23 is formed into a shape that covers a part of the base 21, 21 ′, 21 ″ with the annular disk-shaped flat plate portion 231 and the side portions 232, 232 ′, it is possible to ensure that the base 21, 21 ′, 21 "The firmness. Furthermore, since the supporting member 2 is formed by insert molding the fixing metal parts 23 together with the bases 21, 21', 21", handling of the supporting member becomes easy during assembly.

Fig. 7 is a diagram showing a refrigeration cycle system according to an embodiment. In the drawings, reference numeral 100 denotes an electric valve constituting an expansion valve according to each embodiment of the present invention, 200 denotes an outdoor heat exchanger mounted on an outdoor unit, 300 denotes an indoor heat exchanger mounted on an indoor unit, and 400 denotes a valve constituting a four-way valve. The flow path switching valve, 500 is a compressor. The electric valve 100 , the outdoor heat exchanger 200 , the indoor heat exchanger 300 , the channel switching valve 400 , and the compressor 500 are respectively connected as shown in the figure through conduits to constitute a heat pump refrigeration cycle. In addition, illustration of a pressure accumulator, a pressure sensor, a temperature sensor, and the like is omitted.

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

On the other hand, during the heating operation, as indicated by the dotted arrow in the figure, the refrigerant compressed by the compressor 500 flows from the flow path switching valve 400 through the indoor heat exchanger 300, the electric valve 100, the outdoor heat exchanger 200, The flow switching valve 400 and the compressor 500 are cycled sequentially, the indoor heat exchanger 300 functions as a condenser, and the outdoor heat exchanger 200 functions as an evaporator. The electric valve 100 decompresses and expands the liquid refrigerant flowing in from the outdoor heat exchanger 200 during the cooling operation, or decompresses and expands the liquid refrigerant flowing in from the indoor heat exchanger 300 during the heating operation, and The flow of refrigerant is controlled.

One embodiment has been described above, but the thickness of each portion of the fixing metal fitting 23 may be appropriately set. For example, the thickness of the side portions 232 and 232 ′ may be such that it can be welded to the valve case 1 . In addition, the fixing metal fitting 23 of the present embodiment is formed by press working, but may be formed by cutting or the like. In addition, the welding of the fixing metal parts 23 and the valve casings 1, 1' may be welded around the entire circumference, but it is not limited to welding around the entire circumference, and partial welding may also be used.

In addition, the fixing metal fitting of the embodiment is in the form of a cylindrical shape in which the side portion extends parallel to the axis from the outer periphery of the flat plate portion, but the fixing metal fitting may also be configured in a disk shape. In this case, the disc-shaped outer peripheral part is a side part, and a part of the side part is exposed to the opening end face of the valve body, and the inner corner part formed by the opening end face and the exposed outer peripheral surface of the side part is welded. Can.

The embodiments of the present invention have been described above in detail with reference to the drawings, but the specific configurations are not limited to these embodiments, and the present invention includes design changes and the like within a range not departing from the gist of the present invention.

Claims (7)

1. a kind of motor-driven valve makes valve member move forward and backward to control the aperture of valve port by the rotation of the armature spindle of motor part, and And it is assembled on axis relative to the cylindrical shape and metal valve body for being built-in with above-mentioned valve member and supports above-mentioned rotor The support member of axis forms, and said electric valve is characterized in that,

Above-mentioned support member has base portion in the opening for the cylinder for being inserted into above-mentioned valve body and set on the outer of above-mentioned base portion The Zhou Bingyu base portions are inserted into the fixation metal parts of the inner circumferential of above-mentioned valve body together,

The inside of above-mentioned valve body, and above-mentioned fixed metal are inserted into along above-mentioned axis direction in above-mentioned fixed metal parts A part for part is fixed above-mentioned fixed metal parts and above-mentioned valve body in the state of the exposing of above-mentioned valve body.

2. motor-driven valve according to claim 1, which is characterized in that

At least one party of the above-mentioned base portion of above-mentioned support member and above-mentioned fixed metal parts is press-fit into above-mentioned valve body.

3. motor-driven valve according to claim 1, which is characterized in that

Large-diameter portion, diameter of the above-mentioned valve body with above-mentioned the open side small diameter portion smaller than the diameter of above-mentioned large-diameter portion, Yi Jicong Above-mentioned large-diameter portion to above-mentioned small diameter portion undergauge tapered portion,

The above-mentioned base portion of above-mentioned support member is press-fit into the above-mentioned small diameter portion of above-mentioned valve body.

4. motor-driven valve according to any one of claims 1 to 3, which is characterized in that

Above-mentioned fixed metal parts is by the flat part of the ring discoid centered on above-mentioned axis and from the periphery of above-mentioned flat part The side surface part extended parallel to above-mentioned axis is constituted,

Above-mentioned side surface part is set to the periphery of above-mentioned base portion.

5. motor-driven valve according to any one of claims 1 to 4, which is characterized in that

The above-mentioned base portion of above-mentioned support member is formed from a resin, and above-mentioned support member is by above-mentioned fixed metal parts and above-mentioned base Component made of portion is insert-molded together.

6. motor-driven valve according to any one of claims 1 to 5, which is characterized in that

Above-mentioned fixed metal parts and above-mentioned valve body are fixed by welding.

7. a kind of refrigerating circulation system, including compressor, condenser, expansion valve and evaporator, above-mentioned refrigerating circulation system It is characterized in that,

Using the motor-driven valve described in any one of claim 1~6 as above-mentioned expansion valve.