JP2019019875A - Motor valve and freezing cycle system - Google Patents

Abstract

A motor-operated valve in which a stator can be easily attached to a valve body and a can. A bracket (1) is attached to one position around an opening (11H1) of a fitting hole (11H) on a valve body (20) side of a stator (11). The bracket 1 is composed of an elastic piece 1a and a projection 1b. The elastic piece 1a and the convex portion 1b are arranged in the skirt portion 11K from the valve body 20 side. A concave portion 30a is formed on the outer periphery of the large diameter portion 30B of the can 30. The can 30 is fitted into the cylindrical fitting hole 11H of the stator 11, and the convex portion 1b of the bracket 1 is engaged with the concave portion 30a of the can 30. When assembling the stator 11 to the can 30, the dimensions of each part are set so that the projection 1b of the bracket 1 does not interfere with the small diameter portion 30A of the can 30. [Selection diagram] FIG.

Description

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

  Conventionally, as this type of electric valve, there is one that operates a valve body by rotation of a magnet rotor of a motor unit such as a stepping motor. In such an electric valve, it is necessary to seal the fluid flow path, and the magnet rotor of the motor unit is accommodated in a cylindrical can having a sealing structure together with the valve body. And the stator of a motor part has a structure arrange | positioned on the outer periphery of a can. For example, JP 2003-56736 A (Patent Document 1) and JP 2009-264530 A (Patent Document 2) disclose similar motor-operated valves.

  In addition, the motorized valve in the air conditioner (air conditioner) is installed in the outdoor unit (outdoor unit). When installing, the valve device (valve body and can assembly) is first assembled in the refrigerant pipe, and the pipe is connected. After the parts are brazed and fixed, the stator is fitted into the can and fixed to perform electrical wiring and the like.

JP 2003-56736 A JP 2009-264530 A

  As described above, when the motor-operated valve is installed in the outdoor unit, it is necessary to attach the stator to the valve device in the outdoor unit. However, since the space inside the outdoor unit that is complicatedly piped is narrow, there is a problem that it is difficult to work. For this reason, a structure in which the stator can be easily assembled to the valve device is required.

  An object of the present invention is to provide a motor-operated valve in which a stator is easily assembled to the outer periphery of a can in a motor-operated 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. To do.

  The motor-driven valve according to claim 1 is a valve device in which a substantially cylindrical can centered on an axis that accommodates a magnet rotor of the motor unit is assembled to a valve body that operates by driving the motor unit, and the motor unit And a stator having a cylindrical fitting insertion hole into which the can is fitted, the can having a small diameter portion facing the outer periphery of the magnet rotor, and the diameter of the can increased from the small diameter portion to the valve body side The stator is connected to the valve device in a state where the small diameter portion is fitted into the fitting insertion hole and the large diameter portion is located on the valve body side of the opening of the fitting insertion hole. An electrically operated valve mounted on the stator and extending from the valve body side so as to face the opening; and a convex portion formed on the elastic piece and projecting toward the axis. Elastic part with The can has a concave portion that engages with the convex portion of the elastic member on an outer periphery of the large-diameter portion, and the convex portion and the concave portion are in a state where the stator is assembled to the valve device. The convex portion of the elastic member is configured to engage with the small-diameter portion when the small-diameter portion of the can is inserted into the fitting insertion hole of the stator. And

  The motor-operated valve according to claim 2 is the motor-operated valve according to claim 1, wherein the concave portion of the can is formed to be unevenly distributed from the center position of the large-diameter portion in the axial direction toward the small-diameter portion. It is characterized by being.

  The motor-driven valve according to claim 3 is the motor-operated valve according to claim 1 or 2, wherein the elastic piece of the elastic member is a natural state in which the stator is not mounted on the valve device, and the convex portion is The elastic piece has a structure that is inclined so as to be located on the axis side with respect to the base end portion of the elastic piece.

  The refrigeration cycle system according to claim 4 is a refrigeration cycle system including a compressor, a condenser, an expansion valve, and an evaporator, wherein the motor-operated valve according to any one of claims 1 to 3 is used. It is used as the expansion valve.

  According to the electric valve of the first to third aspects, the elastic member includes an elastic piece extending from the valve main body side so as to face the opening of the fitting insertion hole of the stator, and a convex portion protruding toward the axis of the can. The convex portion engages with the concave portion of the large-diameter portion of the can, and the stator is assembled to the valve device. When the small-diameter portion of the can is inserted into the fitting insertion hole of the stator, the convex portion of the elastic member Since the portion does not interfere with the small diameter portion, the stator can be easily assembled to the outer periphery of the can.

  Further, according to the motor-operated valve of the second aspect, since the concave portion of the can is formed to be unevenly distributed from the central position in the axial direction of the large diameter portion toward the small diameter portion, the opening end portion of the large diameter portion is distorted. The can can be reliably welded without being displaced with respect to the housing or the like.

  According to the refrigeration cycle system of claim 4, the same effects as in claims 1 to 3 can be obtained.

It is a partial cross section side view of the motor operated valve of the embodiment of the present invention. It is a figure which shows the dimensional relationship of the stator, bracket, and can in the motor operated valve of embodiment. It is a longitudinal cross-sectional view of the stator in the electric valve of embodiment. It is a figure showing the refrigerating cycle system of an embodiment.

  Next, an embodiment of the motor-operated valve of the present invention will be described with reference to the drawings. FIG. 1 is a partially sectional side view of the motor-operated valve according to the embodiment, FIG. 2 is a diagram showing a dimensional relationship between the stator, the bracket, and the can in the motor-operated valve according to the embodiment, and FIG. It is. Note that the concept of “upper and lower” in the following description corresponds to the upper and lower sides in the drawing of FIG.

  As shown in FIG. 1, this motor-operated valve includes a bracket 1 as an “elastic member”, a stepping motor 10 as a “motor unit”, a valve body 20, and a cylindrical can 30 made of a non-magnetic material. I have. The stepping motor 10 includes a stator 11 (described later) attached to the outer periphery of the can 30 and a magnet rotor 12 that is rotatably disposed inside the can 30. A predetermined gap is provided between the outer peripheral surface of the magnet rotor 12 and the inner peripheral surface of the can 30.

  The valve body 20 has a housing 210 made of stainless steel or the like, and a valve member or the like is built in the housing 210. The valve body 20 is operated by driving the stepping motor 10 (rotation of the magnet rotor 12), and the flow rate of the fluid flowing from the first joint pipe 21 to the second joint pipe 22 or from the second joint pipe 22 to the first joint. The flow rate of the fluid flowing to the pipe 21 is controlled.

  The can 30 is hermetically assembled to the upper end of the housing 210 of the valve main body 20 by welding or the like, whereby the valve main body 20 and the can 30 constitute a “valve device”.

  The stator 11 is formed by laminating a pair of coil portions in the direction of the axis L1 by winding coils 11b and 11b around a resin bobbin 11a. Further, a yoke (yoke) 11c having magnetic pole teeth 11d is integrally assembled to the bobbin 11a by molding.

  The stator 11 has a cylindrical insertion hole 11H centered on the axis L1 at the center, and magnetic pole teeth 11d of the yoke 11c are arranged on a part of the inner peripheral surface of the insertion hole 11H. . The magnetic pole teeth 11 d are in close contact with the outer peripheral surface of the can 30.

  With the above configuration, in the stepping motor 10, the coil 11b generates lines of magnetic force when a pulse output is applied to the coil 11b. Thereby, the magnetic poles (N and S poles) are alternately changed in the magnetic pole teeth 11d, and a magnetic attractive force and a magnetic repulsive force are generated with respect to the magnet rotor 12, so that the magnet rotor 12 rotates. As a result, the valve body 20 is operated, and the flow rate of the refrigerant flowing from the first joint pipe 21 to the second joint pipe 22 or from the second joint pipe 22 to the first joint pipe 21 is controlled as described above.

  The bottom portion of the stator 11 on the valve body 20 side has a flange portion 11K having a diameter expanded from the opening portion 11H1 of the fitting insertion hole 11H to the valve body 20 side. The can 30 has an axis L2 as a central axis, and includes a small-diameter portion 30A that faces the outer periphery of the magnet rotor 12, and a large-diameter portion 30B that is expanded from the small-diameter portion 30A to the valve body 20 side. The small diameter portion 30A of the can 30 is fitted into the fitting insertion hole 11H of the stator 11, and the large diameter portion 30B of the can 30 is positioned on the valve body 20 side of the opening 11H1 of the fitting insertion hole 11H. A part of the large-diameter portion 30B is accommodated in the 11 flange portions 11K. Thereby, the stator 11 is attached to the valve device.

  A bracket 1 as an “elastic member” is attached at one place around the opening 11H1 of the fitting insertion hole 11H at the bottom of the stator 11. The bracket 1 has an elastic piece 1a extending from the valve body 20 side so as to face the opening 11H1 of the fitting insertion hole 11H and a convex portion 1b formed on the elastic piece 1a in the flange portion 11K. ing. The convex portion 1b protrudes toward the center side (axis L1 side) of the flange portion 11K of the stator 11. Further, the can 30 has a plurality of recesses 30a formed on the outer periphery of the large-diameter portion 30B so as to engage with the protrusions 1b of the bracket 1.

  And as shown in FIG. 1, the convex part 1b of the bracket 1 and the recessed part 30a of the can 30 engage in the state which the stator 11 assembled | attached to the valve apparatus. Accordingly, the stator 30 is positioned around the axis L1 of the stator 11, and the stator 11 is attached to the can 30 in a state in which the stator 11 is prevented from coming off.

As shown in FIG. 2, the inner diameter A of the insertion hole 11H of the stator 11, the outer diameter B of the small diameter portion 30A of the can 30, the distance C from the axis L1 of the convex portion 1b of the bracket 1 in the natural state, The outer diameter D of the large-diameter portion 30B is set as follows.
C <A / 2 (1)
B / 2 <C + (AB) (2)
D / 2> C + (AB) (3)

Condition (1) is a condition in which the convex portion 1b protrudes inward (on the axis L1 side) from the inner wall of the fitting insertion hole 11H of the stator 11. Condition (2) is a condition in which the convex portion 1b does not slide (contact) with the small diameter portion 30A when the can 30 is attached (inserted) to the stator 11. Condition (3) is a condition in which the convex portion 1b slides on the large diameter portion 30B when the can 30 is mounted on the stator 11. Also, these conditions are
Assuming C <A / 2,
B / 2 <C + (AB) <D / 2
Or B / 2-C <(AB) <D / 2-C
It shows that. The outer diameter B of the small-diameter portion 30A of the can 30 is slightly smaller than the inner diameter A of the fitting insertion hole 11H of the stator 11. Therefore, when the can 30 is inserted into the stator 11, the small-diameter portion 30A of the can 30 does not slide on the inner wall of the fitting hole 11H of the stator 11 (the clearance between the small-diameter portion 30A and the fitting hole 11H is increased). In some cases, it is inserted while being slid into any part of the inner wall of the fitting hole 11H other than the part where the convex part 1b protrudes. Here, in FIG. 2, one place (one bus) around the outer peripheral surface of the small diameter portion 30 </ b> A of the can 30 slides on the inner peripheral surface on the opposite side to the convex portion 1 b of the fitting insertion hole 11 </ b> H of the stator 11. Such a positional relationship is illustrated, and in the state of FIG. 2, the axis line L1 and the axis line L2 are in a state of being shifted by a slight amount of (AB). Further, this state is a state in which the convex portion 1b and the small diameter portion 30A do not interfere with each other. That is, when the small-diameter portion 30A is inserted into the insertion hole 11H, even if the convex portion 1b contacts the small-diameter portion 30A, the small-diameter portion 30A is separated from the convex portion 1b according to the condition (2). It is possible to prevent the portion 30b from receiving (interfering with) the elastic force from the convex portion 1b.

Furthermore, with respect to the distance E from the axis L1 of the stator 11 to the base end portion 1a1 of the elastic piece 1a of the bracket 1, the elastic piece 1a of the bracket 1 is connected to the axis L2 of the can 30 when the can 30 is mounted on the stator 11. The distance E ′ to the base end 1a1 is set as follows.
D / 2 <E + (AB) (4)
D / 2 <E ′ (5)

  Conditions (4) and (5) are conditions in which the large diameter portion 30B does not slide (contact) with the base end portion 1a1 of the bracket 1 when the can 30 is mounted on the stator 11.

  As described above, when the can 30 is mounted on the stator 11, even when the small diameter portion 30A is inserted into the insertion hole 11H (inner diameter A), there is a gap between the small diameter portion 30A and the convex portion 1b of the bracket 1. Can be provided. That is, since it is comprised so that the convex part 1b of the bracket 1 and the small diameter part 30A of the can 30 may not interfere, it becomes easy to assemble | attach without requiring extra force.

The relationship between the angle α of the elastic piece 1a of the bracket 1 in the natural state and the taper angle β between the small diameter portion 30A and the large diameter portion 30B in the can 30 is as follows.
α <β (6)
If the condition is
The force with which the elastic piece 1a urges the large-diameter portion 30B in the radial direction is reduced, and the assembly becomes easier.

  Furthermore, in this embodiment, the recess 30a of the can 30 is formed to be unevenly distributed from the center position of the large diameter portion 30B in the axis L2 direction toward the small diameter portion 30B. Therefore, when the concave portion 30a is formed by, for example, press working or the like, the opening end of the can 30 (large diameter portion 30B) is not distorted, and the can 30 can be surely displaced without being displaced with respect to the housing 210. Can be welded to.

  In addition, in the can 30, since the protrusion end to the inner side of the recessed part 30a of the large diameter part 30B does not protrude inward from the inner peripheral surface of the small diameter part 30A, when inserting the magnet rotor 12 into the small diameter part 30B. The recess 30a does not get in the way and can be easily assembled.

  FIG. 4 is a diagram illustrating the refrigeration cycle system of the embodiment. In the figure, reference numeral 100 denotes an electric valve according to an embodiment of the present invention constituting an expansion valve, 200 denotes an outdoor heat exchanger mounted on the outdoor unit, 300 denotes an indoor heat exchanger mounted on the indoor unit, and 400 denotes a four-way valve. Reference numeral 500 denotes a flow path switching valve. The motor-operated valve 100, the outdoor heat exchanger 200, the indoor heat exchanger 300, the flow path switching valve 400, and the compressor 500 are connected by conduits as shown in the figure, and constitute a heat pump refrigeration cycle. The accumulator, pressure sensor, temperature sensor, etc. are not shown.

  The flow path of the refrigeration cycle is switched by the flow path switching valve 400 into a flow path during cooling operation and a flow path during heating operation. During the cooling operation, as indicated by solid arrows 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. The refrigerant liquid flowing out of the outdoor heat exchanger 200 flows into the indoor heat exchanger 300 via the motor-operated valve 100, and the indoor heat exchanger 300 functions as an evaporator.

  On the other hand, during heating operation, 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, the flow path, as indicated by the broken arrows in the figure. The switching valve 400 and the compressor 500 are circulated in this order, and 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 refrigerant liquid flowing from the outdoor heat exchanger 200 during the cooling operation or the refrigerant liquid flowing from the indoor heat exchanger 300 during the heating operation, and further controls the flow rate of the refrigerant.

  As described above, the embodiments of the present invention have been described in detail with reference to the drawings. However, the specific configuration is not limited to these embodiments, and the design can be changed without departing from the scope of the present invention. Is included in the present invention.

1 Bracket (elastic member)
1a Elastic piece 1a1 Base end part 1b Convex part 10 Stepping motor (motor part)
11 Stator 11H Insertion hole 11H1 Opening 11K Hook 11a Bobbin 11b Coil 11c yoke L1 Stator axis 12 Magnet rotor 20 Valve body 21 First joint pipe 22 Second joint pipe 210 Housing 30 Can 30A Small diameter part 30B Large diameter part 30a Concave L2 Can axis 100 Electric valve 200 Outdoor heat exchanger 300 Indoor heat exchanger 400 Flow path switching valve 500 Compressor

Claims (4)

A valve device in which a substantially cylindrical can centered on an axis housing the magnet rotor of the motor unit is assembled to a valve main body that operates by driving the motor unit, and the motor unit is configured and the can is fitted. And a stator having a cylindrical fitting insertion hole to be inserted,
The can consists of a small-diameter portion facing the outer periphery of the magnet rotor and a large-diameter portion expanded from the small-diameter portion to the valve body side,
The small diameter portion is fitted in the fitting insertion hole, and the stator is an electric valve mounted on the valve device in a state where the large diameter portion is located on the valve body side of the opening of the fitting insertion hole. And
Provided with an elastic member provided on the stator and extending from the valve body side so as to face the opening, and an elastic member formed on the elastic piece and projecting toward the axis; The can has a concave portion that engages with the convex portion of the elastic member on the outer periphery of the large-diameter portion,
The convex portion and the concave portion are engaged in a state where the stator is assembled to the valve device, and the convex portion of the elastic member is connected to the small diameter portion of the can in the fitting insertion hole of the stator. A motor-operated valve configured so as not to interfere with the small diameter portion when being inserted.   2. The motor-operated valve according to claim 1, wherein the concave portion of the can is formed so as to be unevenly distributed from a central position of the large-diameter portion in the axial direction toward the small-diameter portion.   The elastic piece of the elastic member has a structure in which the convex portion is inclined so as to be positioned closer to the axial line than the base end portion of the elastic piece in a natural state where the stator is not mounted on the valve device. The motor-operated valve according to claim 1, wherein the motor-operated valve is provided.   A refrigeration cycle system including a compressor, a condenser, an expansion valve, and an evaporator, wherein the motor-operated valve according to any one of claims 1 to 3 is used as the expansion valve. A refrigeration cycle system characterized by that.

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