JP6884678B2 - Electric valve and refrigeration cycle system - Google Patents

Description

The present invention relates to an electric valve used in a refrigeration cycle system such as an air conditioner and a refrigeration cycle system including the electric valve.

Conventionally, as an electric valve of this type, there is one that operates the valve body by the rotation of the magnet rotor of the motor unit. In such an electric valve, it is necessary to seal the fluid flow path, and the magnet rotor of the motor portion is housed in a cylindrical can that forms a sealed structure together with the valve body. The stator of the motor unit is arranged on the outer circumference of the can. Further, in this type of electric valve, in order to prevent electrical noise between the joint iron (yoke) of the stator and the can, the joint iron of the stator is electrically connected to the valve body side. For example, Japanese Patent No. 4490063 (Patent Document 1), Japanese Patent No. 4515045 (Patent Document 2), and Japanese Patent Application Laid-Open No. 2016-14453 (Patent Document 3) disclose similar electric valves.

Japanese Patent No. 4490063 Japanese Patent No. 4515045 Japanese Unexamined Patent Publication No. 2016-14453

Patent Documents 1 to 3 disclose a structure in which a joint iron of a stator is electrically connected to a valve body side. In Patent Document 1, a detent member for fixing the stator to the can is provided, and the detent member is brought into contact with the joint pipe (fluid outlet pipe) on the valve body side, and the detent member and the joint iron are used. Are connected by a conductive elastic body or the like. Further, in Patent Document 2, the conductive detent member and the yoke are connected by a conductive fixing pin, and the conductive detent member is in contact with the joint pipe. Further, in Patent Document 3, the conductive spring is elastically pressed against the yoke, and the yoke and the detent member are electrically connected via the conductive spring. As described above, in the conventional structure, there are problems such as an increase in the number of parts and a complicated structure.

The present invention is an electric valve in which a stator is attached to a valve device in which a can accommodating a magnet rotor is assembled to a valve body, and a stator is used in a simple configuration by using a bracket for fixing the stator to the can. It is an object of the present invention to provide an electric valve capable of reliably grounding the joint iron and the can.

The electric valve according to claim 1 comprises a valve device in which a substantially cylindrical can accommodating a magnet rotor of the motor portion is assembled to a valve main body operated by driving the motor portion, and the motor portion. An electric valve comprising a stator having a cylindrical fitting hole for fitting a can, and the can is fitted into the fitting hole and the stator is mounted on the valve device, and is provided on the stator. The elastic member includes an elastic member having a base portion fixed to the stator and an elastic piece extending from the base portion to the axial side of the fitting / insertion hole, and the elastic member has a plate-shaped base portion as the base portion. The stator is arranged so as to face an orthogonal plane with respect to the axis of the fitting hole , and is firmly fixed to the bottom surface of the back cover of the stator. A part of the elastic piece of the elastic member is a joint iron of the stator. It has a first engaging portion that is configured as a contact portion with respect to the axis and is projected on the axis side or recessed on the opposite side of the protrusion, and the can has a second engagement portion that engages with the first engaging portion on the outer periphery. In a state where the elastic piece has a joint portion and the first engaging portion of the elastic piece is engaged with the second engaging portion of the can, a part of the elastic piece is brought into contact with the contact portion by its own elastic force. It is characterized in that it is pressure-welded to the joint iron.

The electric valve according to claim 2 is the electric valve according to claim 1, and the first engaging portion and the contact portion of the elastic piece are such that the first engaging portion is along the elastic piece. It is characterized in that it is located closer to the base portion than the contact portion and is arranged so that the contact portion is located on the free end side of the elastic piece opposite to the base portion.

The electric valve according to claim 3 is the electric valve according to claim 1, and the first engaging portion and the contact portion of the elastic piece are such that the first engaging portion is the base portion of the elastic piece. It is characterized in that it is located on the free end side opposite to the above, and the contact portion is arranged along the elastic piece so as to be located closer to the base portion than the first engaging portion.

The electric valve according to claim 4 is the electric valve according to claim 2, and the elastic force of the elastic piece is the elastic force of the portion between the base portion and the first engaging portion and the first one. It is characterized by being an elastic force of a portion between the engaging portion and the contact portion.

The electric valve according to claim 5 is the electric valve according to claim 3, and the elastic force of the elastic piece is the elastic force of the portion between the base portion and the contact portion, and the contact portion and the first. It is characterized in that it is an elastic force of a portion between the engaging portion and the engaging portion.

The electric valve according to claim 6 is the electric valve according to claim 4 or 5, wherein the elastic member engages the first engaging portion with the second engaging portion of the can by the elastic force of the elastic piece. It is characterized in that the contact portion is pressed against the portion toward the axis line and the contact portion is pressed against the joint iron which is a plane orthogonal to the axis line in the axial direction.

The electric valve according to claim 7 is the electric valve according to any one of claims 1 to 6, wherein the first engaging portion of the elastic piece is a convex portion protruding toward the axis. The second engaging portion on the outer periphery of the can is a concave portion that engages with the convex portion.

The refrigeration cycle system according to claim 8 is a refrigeration cycle system including a compressor, a condenser, an expansion valve, and an evaporator, wherein the electric valve according to any one of claims 1 to 7 is used. , It is characterized in that it is used as the expansion valve.

According to the electric valves of claims 1 to 7, the elastic piece of the elastic member for fixing the stator to the can is provided with a first engaging portion with respect to the can and a contact portion in contact with the joint iron of the stator, and the elastic piece is provided. Since it is fixed to the can via the first engaging portion by the elastic force of the above and is surely brought into contact with the joint iron of the stator, the joint iron and the can can be surely grounded with a simple configuration.

According to the refrigeration cycle system of claim 8, the same effect as that of claims 1 to 7 can be obtained.

It is a partial cross-sectional side view of the electric valve of the 1st Embodiment of this invention. It is the bottom view of the main part of the stator in the electric valve of 1st Embodiment. It is a bottom view of the main part of the stator and the bracket in the electric valve of 1st Embodiment. It is sectional drawing of the stator and the bracket in the electric valve of 1st Embodiment. FIG. 3 is a cross-sectional view taken along the line BB and an exploded view of FIG. It is a partial cross-sectional side view of the electric valve of the 2nd Embodiment of this invention. It is sectional drawing of the stator and the bracket in the electric valve of 2nd Embodiment. It is a figure which shows the refrigeration cycle system of an embodiment.

Next, an embodiment of the electric valve of the present invention will be described with reference to the drawings. FIG. 1 is a partial cross-sectional side view of the electric valve of the first embodiment, and corresponds to the AA cross section of FIG. FIG. 2 is a bottom view of a main part of the stator in the electric valve of the first embodiment, FIG. 3 is a bottom view of a main part of the stator and bracket in the electric valve of the first embodiment, and FIG. 4 is a stator in the electric valve of the first embodiment. And a cross-sectional view of the bracket, FIG. 5 is a cross-sectional view taken along the line BB and an exploded view of FIG. The concept of "upper and lower" in the following description corresponds to the upper and lower parts in the drawing of FIG.

As shown in FIG. 1, this electric valve includes a bracket 1 as an "elastic member", a stepping motor 20 as a "motor portion", a valve body 30, and a cylindrical can 40 made of a non-magnetic material. I have. The stepping motor 20 includes a stator 21 attached to the outer periphery of the can 40 and a magnet rotor 22 rotatably arranged inside the can 40. A predetermined gap is provided between the outer peripheral surface of the magnet rotor 22 and the inner peripheral surface of the can 40.

The valve body 30 has a housing 310 made of stainless steel or the like, and a valve member or the like is built in the housing 310. Then, the valve body 30 is operated by driving the stepping motor 20 (rotation of the magnet rotor 22), and the flow rate of the fluid flowing from the first joint pipe 31 to the second joint pipe 32, or the flow rate of the fluid flowing from the second joint pipe 32 to the first joint. The flow rate of the fluid flowing to the pipe 31 is controlled.

A can 40 is airtightly assembled to the upper end of the housing 310 of the valve body 30 by welding or the like, whereby the valve body 30 and the can 40 form a "valve device".

The stator 21 is configured by winding coils 21b and 21b around a resin bobbin 21a so that a pair of coil portions are laminated in the axis L direction. Further, a joint iron (yoke) 21c having magnetic pole teeth 21d is integrally assembled to the bobbin 21a by molding. Further, the stator 21 has a cylindrical fitting hole 21H centered on the axis L in the center, and the magnetic pole teeth 21d of the joint iron 21c are arranged on a part of the inner peripheral surface of the fitting insertion hole 21H. ing. The magnetic pole teeth 21d are arranged to face the outer peripheral surface of the can 40.

With the above configuration, in the stepping motor 20, the coil 21b generates a magnetic field line by applying the pulse output to the coil 21b. As a result, the magnetic poles (N, S poles) change alternately in the magnetic pole teeth 21d, a magnetic attraction force and a magnetic repulsion force are generated with respect to the magnet rotor 22, and the magnet rotor 22 rotates. As a result, the valve member inside the valve body 30 operates and the opening degree of the valve opening is variably controlled, so that the first joint pipe 31 to the second joint pipe 32 or from the second joint pipe 32 as described above. The flow rate of the refrigerant flowing to the first joint pipe 31 is controlled.

The bottom of the stator 21 on the valve body 30 side has a hakama portion 21K whose diameter is expanded from the opening 21H1 of the fitting hole 21H to the valve body 30 side. Further, the can 40 is composed of a small diameter portion 40A facing the outer circumference of the magnet rotor 22 with the axis L as the central axis, and a large diameter portion 40B whose diameter is expanded from the small diameter portion 40A to the valve body 30 side. Then, the small diameter portion 40A of the can 40 is fitted into the fitting insertion hole 21H of the stator 21, and the large diameter portion 40B of the can 40 is located on the valve body 30 side of the opening 21H1 of the fitting insertion hole 21H. A part of the large diameter portion 40B is housed in the hakama portion 21K of 21. As a result, the stator 21 is attached to the valve device.

A bracket 1 as an "elastic member" is attached to one place around the opening 21H1 of the fitting hole 21H at the bottom of the stator 21. The bracket 1 has a plate-shaped base portion 11 as a “base portion” and an elastic piece 12 extending from the plate-shaped base portion 11 to the axis L side of the fitting hole 21H. The elastic piece 12 is a portion where the stator 21 is fixed by elastically deforming when it is fixed to the can 40. The elastic piece 12 is formed by bending a convex portion 12a as a "first engaging portion" formed integrally with the elastic piece 12 and an end portion of the elastic piece 12 opposite to the plate-shaped base portion 11. It has a contact portion 12b and a contact portion 12b. The elastic piece 12 is bent from the plate-shaped base 11 across the end of the hakama portion 21K into the hakama portion 21K, and further faces the opening 21H1 of the fitting hole 21H from the valve body 30 side in the hakama portion 21K. Is postponed. Further, the elastic piece 12 has a constant plate width (W1) from the C portion on the plate-shaped base 11 side to the bent portion E of the contact portion 12b as shown in FIG. 3, but from the bent portion E to the contact portion 12b. The plate width W2 (not shown) to the tip is narrower than W1 and has a size that fits in the area of the joint iron 21c in FIG. The convex portion 12a is located closer to the plate-shaped base portion 11 than the contact portion 12b of the elastic piece 12, and projects toward the center side (axis line L side) of the hakama portion 21K of the stator 21. The can 40 is formed with a plurality of recesses 40a as "second engaging portions" having a shape of engaging with the convex portions 12a of the bracket 1 on the outer periphery of the large diameter portion 40B.

The bobbin 21a of the stator 21 has a back cover 21a1 formed on the lower flange of the bobbin 21a so as to be orthogonal to the axis L of the stator 21 and also has a function of fixing the lead wire. The bracket 1 is fixed to the back cover 21a1 by arranging the plate-shaped base 11 so as to face the bottom surface of the back cover 21a1, that is, the plane orthogonal to the axis L of the stator 21.

More specifically, as shown in FIG. 5, in the bracket 1, the plate-shaped base portion 11 has a side plate 11a in which both ends of a rectangle are bent at right angles, and a claw 11b cut out from the side plate 11a. .. Then, the bracket 1 is fixed to the back cover 21a1 by sandwiching both side portions of the back cover 21a1 of the stator 21 with the side plates 11a and 11a and locking the claws 11b and 11b on the upper surface of the back cover 21a1. At this time, the plate-shaped base portion 11 is elastically deformed at the portion of the tapered surface 21a2 on the side portion of the back cover 21a1, and is fixed to the back cover 21a1 by the elastic force of the claws 11b and 11b and the plate-shaped base portion 11.

As described above, in this embodiment, since the bracket 1 only needs to engage the side plate 11a and the claw 11b with respect to the stator 21, it can be easily fixed to the stator 21. Further, the bracket 1 can be securely and firmly fixed to the stator 21 by the elastic force of the plate-shaped substrate 11.

By providing the bracket 1 on the stator 21 as described above, the stator 21 is fixed to the can 40, and the stator 21 and the can 40 are electrically connected to each other. That is, as shown in FIG. 1, the convex portion 12a of the bracket 1 and the concave portion 40a of the can 40 are engaged in a state where the stator 21 is assembled to the valve device. As a result, the stator 21 is positioned around the axis L of the stator 21 with respect to the can 40, and the stator 21 is attached to the can 40 in a state where it is prevented from coming off in the axis L direction.

At this time, the elastic piece 12 of the bracket 1 exerts an elastic force for returning to the free state of FIG. 4 mainly on the can 40 side with the bent portion D on the plate-shaped base 11 side as a fulcrum, and causes the convex portion 12a to act. Press against the recess 40a of the can 40. Further, the contact portion 12b of the bracket 1 is in contact with the joint iron 21c. At this time, the convex portion 12a is pressed and fixed to the concave portion 40a, so that the contact portion 12b is pressed against the joint iron 21c by the elastic force of the elastic piece 12 that mainly acts with the convex portion 12a as a fulcrum. That is, the elastic piece 12 presses the convex portion 12a against the concave portion 40a and presses the contact portion 12b against the joint iron 21c by the elastic force of the portion between the convex portion 12a and the contact portion 12b.

In this way, the bracket 1 presses the convex portion 12a against the concave portion 40a on the side surface of the can 40 toward the axis L side by the elastic force of the elastic piece 12, and the contact portion 12b is a joint that is orthogonal to the axis L. It is pressed against the iron 21c in the L direction of the axis. Even in the state of the stator and the bracket (FIG. 4) before the stator 21 is attached to the can 40 of the valve device, the tip of the contact portion 12b is in contact with the joint iron 21c to some extent, but it is not certain. However, as shown in FIG. 1, the pressure contact force (elastic force) caused by attaching to the can 40 enables more reliable contact.

As a result, the bracket 1 becomes. It is electrically grounded to the can 40 via the convex portion 12a and the concave portion 40a, and is electrically grounded to the joint iron 21c via the contact portion 12b. In this way, the elastic force of the elastic piece 12 of the bracket 1 ensures that the joint iron 21c and the can 40 are grounded, and electrical noise between the joint iron 21c and the can 40 can be prevented.

FIG. 6 is a partial cross-sectional side view of the electric valve of the second embodiment of the present invention, and FIG. 7 is a sectional view of a stator and a bracket in the electric valve of the second embodiment. The same reference numerals as those in FIGS. 1 to 5 will be added and duplicated description will be omitted as appropriate. The difference between the second embodiment and the first embodiment is the shape of the bracket 1', and other configurations are the same as those of the first embodiment.

The bracket 1'in the second embodiment has the same plate-shaped base portion 11 as in the first embodiment, the plate-shaped base portion 11, and the elasticity extending from the plate-shaped base portion 11 to the axis L side of the fitting hole 21H. It has a piece 13. The elastic piece 13 has a convex portion 13a formed integrally with the elastic piece 13 and a contact portion 13b formed as a bent portion on the plate-like base 11 side of the convex portion 13a of the elastic piece 13. doing. The elastic piece 13 straddles the end of the hakama portion 21K from the plate-shaped base portion 11 and reaches the contact portion 13b along the inner surface of the hakama portion 21K, and further extends from the contact portion 13b to the valve body 30 side via the convex portion 13a. It has been postponed. The bracket 1'is fixed to the bottom surface of the back cover 21a1 via the plate-shaped base 11 in the same configuration as in the first embodiment.

Also in this second embodiment, since the bracket 1'is provided on the stator 21, the stator 21 is fixed to the can 40, and the contact portion 13b of the bracket 1'is in contact with the joint iron 21c. At this time, the elastic piece 13 of the bracket 1'applies an elastic force for returning to the free state shown in FIG. 7 mainly on the can 40 side with the contact portion 13b as a fulcrum, and the convex portion 13a acts as a concave portion 40a of the can 40. Press on. In this way, the position of the can 40 in the axis L direction is fixed with respect to the stator 21 by the force of the convex portion 13a pressing the concave portion 40a. Further, at this time, the contact portion 13b is pressed against the joint iron 21c by the elastic force of the portion between the plate-shaped base portion 11 and the contact portion 13b due to the fixing of the stator 21 to the can 40. Specifically, the portion between the plate-shaped base portion 11 and the contact portion 13b is press-welded to the joint iron 21c mainly by the elastic force of the portions of the first bent portion F and the second bent portion G rising from the plate-shaped base portion. Has been done.

In this way, the bracket 1'presses the convex portion 13a against the concave portion 40a on the side surface of the can 40 toward the axis L side by the elastic force of the elastic piece 13, and the contact portion 13b becomes a plane orthogonal to the axis L. It is pressed against the joint iron 21c in the L direction of the axis.

As a result, as in the first embodiment, the joint iron 21c and the can 40 are surely grounded by the elastic force of the elastic piece 13 of the bracket 1', and the joint iron 21c and the can 40 are electrically connected to each other. Noise can be prevented.

FIG. 8 is a diagram showing a refrigeration cycle system of the embodiment. In the figure, reference numeral 100 is an electric valve of the embodiment of the present invention constituting an expansion valve, 200 is an outdoor heat exchanger mounted on an outdoor unit, 300 is an indoor heat exchanger mounted on an indoor unit, and 400 is a four-way valve. The flow path switching valve 500 constituting the above is a compressor. The electric valve 100, the outdoor heat exchanger 200, the indoor heat exchanger 300, the flow path switching valve 400, and the compressor 500 are each connected as shown by a conduit to form a heat pump type refrigeration cycle. The accumulator, pressure sensor, temperature sensor, etc. are not shown.

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

On the other hand, during the heating operation, as shown by the broken arrow in the figure, the refrigerant compressed by the compressor 500 is transferred from the flow path switching valve 400 to the indoor heat exchanger 300, the electric valve 100, the outdoor heat exchanger 200, and the flow path. The switching valve 400 and the compressor 500 are circulated in this order, the indoor heat exchanger 300 functions as a condenser, and the outdoor indoor heat exchanger 200 functions as an evaporator. The electric valve 100 depressurizes and expands the refrigerant liquid flowing from the outdoor heat exchanger 200 during the cooling operation and the refrigerant liquid flowing from the indoor heat exchanger 300 during the heating operation, and further controls the flow rate of the refrigerant.

The first engaging portion integrally formed with the elastic piece is not limited to the convex portion protruding toward the axis side, but is a concave portion recessed on the side opposite to the axis side with respect to the protrusion of the convex portion. There may be. Further, the second engaging portion of the can is not limited to a plurality of recesses recessed on the axis side of the outer circumference of the can, but is a plurality of convex portions protruding outward from the outer diameter of the outer circumference of the can. You may. When the first engaging portion of the elastic piece is a concave portion, the second engaging portion on the can side becomes a convex portion, which is a combination of a relationship in which the first engaging portion and the second engaging portion are securely engaged. ..

Although the embodiments of the present invention have been described in detail with reference to the drawings, the specific configuration is not limited to these embodiments, and the design changes, etc. within the range not deviating from the gist of the present invention, etc. Even if there is, it is included in the present invention.

1 Bracket (elastic member)
11 Plate-shaped base (base)
12 Elastic piece 12a Convex part (first engaging part)
12b Contact part 20 Stepping motor (motor part)
21 Stator 21H Fitting hole 21H1 Opening 21a Bobbin 21b Coil 21c Joint iron L Stator axis 22 Magnet rotor 30 Valve body 31 First joint pipe 32 Second joint pipe 310 Housing 40 Can 40A Small diameter 40B Large diameter 40a Recess ( Second engaging part)
1'bracket (elastic member)
13 Elastic piece 13a Convex part (first engaging part)
13b Contact part 100 Electric valve 200 Outdoor heat exchanger 300 Indoor heat exchanger 400 Flow path switching valve 500 Compressor

Claims (8)

A valve device in which a substantially cylindrical can accommodating a magnet rotor of the motor unit is assembled to a valve body operated by driving the motor unit, and a cylindrical fitting that constitutes the motor unit and fits the can. An electric valve comprising a stator having an insertion hole, the can is fitted into the insertion / insertion hole, and the stator is mounted on the valve device.
An elastic member provided on the stator and having a base portion fixed to the stator and an elastic piece extending from the base portion to the axis side of the fitting hole is provided.
The elastic member has a plate-shaped base portion as the base portion arranged so as to face an orthogonal plane with respect to the axis of the fitting hole of the stator, and is firmly fixed to the bottom surface of the back cover of the stator.
The elastic piece of the elastic member has a first engaging portion that is partially formed as a contact portion with respect to the joint iron of the stator and that protrudes on the axis side or is recessed on the opposite side of the protrusion. The can has a second engaging portion that engages with the first engaging portion on the outer periphery.
In a state where the first engaging portion of the elastic piece is engaged with the second engaging portion of the can, a part of the elastic piece is pressed against the joint iron by its own elastic force. An electric valve characterized by being The first engaging portion and the contact portion of the elastic piece are such that the first engaging portion is located along the elastic piece on the base side of the contact portion, and the contact portion is the elastic piece. The electric valve according to claim 1, wherein the electric valve is arranged so as to be located on the free end side opposite to the base portion. The first engaging portion and the contact portion of the elastic piece are such that the first engaging portion is located on the free end side of the elastic piece opposite to the base portion, and the contact portion is attached to the elastic piece. The electric valve according to claim 1, wherein the electric valve is arranged so as to be located closer to the base portion side than the first engaging portion. The elastic force of the elastic piece is characterized by being the elastic force of the portion between the base portion and the first engaging portion and the elastic force of the portion between the first engaging portion and the contact portion. The electric valve according to claim 2. A claim characterized in that the elastic force of the elastic piece is an elastic force of a portion between the base portion and the contact portion and an elastic force of a portion between the contact portion and the first engaging portion. Item 3. The electric valve according to item 3. The elastic member presses the first engaging portion toward the axis side with respect to the second engaging portion of the can by the elastic force of the elastic piece, and the contact portion is a plane orthogonal to the axis. The electric valve according to claim 4 or 5, wherein the joint iron is in pressure contact with the joint iron in the axial direction. The first engaging portion of the elastic piece is a convex portion protruding toward the axis, and the second engaging portion on the outer periphery of the can is a concave portion that engages with the convex portion. The electric valve according to any one of claims 1 to 6. A refrigeration cycle system including a compressor, a condenser, an expansion valve, and an evaporator, wherein the electric valve according to any one of claims 1 to 7 is used as the expansion valve. A refrigeration cycle system characterized by that.

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