CN111197664A

CN111197664A - Stator for electric valve and electric valve

Info

Publication number: CN111197664A
Application number: CN201911047816.9A
Authority: CN
Inventors: 土井琢郎; 中川大树
Original assignee: Saginomiya Seisakusho Inc
Current assignee: Saginomiya Seisakusho Inc
Priority date: 2018-11-16
Filing date: 2019-10-30
Publication date: 2020-05-26
Anticipated expiration: 2039-10-30
Also published as: JP2020088931A; CN111197664B; JP7154115B2; JP2022173516A; CN115585300A; JP7389876B2

Abstract

The invention provides a stator for an electric valve and an electric valve, in the rotor (21) for the electric valve which forms a motor part together with a magnetic rotor of a valve device, a bracket (1) for fixing on a cylindrical part of a shell (40) of the valve device is improved, a coil (21b) in the stator is prevented from being damaged, and the insulation performance is prevented from being deteriorated. A base (11) of a fixed block (21B) fixed to the bracket integrates an outer plate (11a) and an inner plate (11B) which clamp the fixed block in the radial direction of the insertion hole (21H) with each other by a connecting plate (11 c). A fixing structure is formed by the protrusion (53) of the fixing block and the locking arm (11a1) of the outer plate. Movement of the base in the direction of the axis (L) is restricted relative to the fixed block by the fixing structure. The outer side plate is not projected from the fixing block by making the fixing structure within the width (W1) of the fixing block in the axial direction.

Description

Stator for electric valve and electric valve

Technical Field

The present invention relates to a stator for an electric valve suitable for use in a refrigeration cycle system or the like of an air conditioner or the like, and an electric valve provided with the stator for an electric valve.

Background

Conventionally, as such a motor-operated valve, there is a structure in which a valve member in a valve main body is operated by rotation of a magnetic rotor of a motor unit such as a stepping motor. In such a motor-operated valve, it is necessary to close the fluid flow path, and the magnetic rotor of the motor unit is housed in a cylindrical housing that constitutes a closed structure together with the valve main body. The stator of the motor unit is disposed on the outer periphery of the housing. For example, japanese patent laid-open publication No. 2015-10659 (patent document 1) discloses a similar motor-operated valve.

Documents of the prior art

Patent document 1: japanese laid-open patent publication No. 2015-10659

Patent document 2: japanese patent laid-open publication No. 2017-15104

In recent years, the outdoor unit of a popular air conditioner is required to be space-saving, and also, the energy saving performance is important to be improved, and the shape of piping in the outdoor unit is diversified and complicated. In this way, the space inside the outdoor unit in which the piping is complicated is small, and the shape of the valve device is limited. In the content of patent document 1, a bracket for fixing the stator is provided on the entire circumference around the axis of the stator, and the outer circumference of the stator becomes large in its size. Further, since the bracket has a portion close to the coil (winding) (e.g., hook portion 38 in fig. 1 and 3 of patent document 1), the coil (winding) may be damaged due to winding unevenness of the coil (winding) or the like, and there is a problem in that insulation is caused by water intrusion from the outside when a gap is left at an adhesion interface between the molding material (electrically insulating resin) and the bracket.

Disclosure of Invention

The invention provides a stator for an electric valve and an electric valve, wherein the stator for the electric valve and a magnetic rotor of a valve device form a motor part, a bracket used for being fixed on a cylindrical part of a shell of the valve device is improved, and a coil (winding) in the stator is prevented from being damaged, so that the insulation property can be prevented from being deteriorated.

The stator for an electric valve according to claim 1 is mounted on a valve device that operates by driving of a motor unit, the motor is configured by a coil built in with a magnetic rotor of the valve device, the stator has an insertion hole into which the valve device is inserted, and the stator for an electric valve and the valve device are fixed by engaging with the valve device, the stator for an electric valve and the valve device are provided with an elastic member, a fixed block is formed on an outer periphery of an opening portion of the insertion hole around an axis thereof, the fixed block being located outside an end portion of the coil in the axial direction, the elastic member has an elastic piece engaging with the valve device, and a base portion fixed to the fixed block, the base portion is configured by integrating an outer plate and an inner plate that sandwich the fixed block in a radial direction of the insertion hole by a coupling plate, and the stator includes a fixing structure configured by the outer plate of the fixed block and the base portion, the base is located within the width of the fixed block in the axial direction, and restricts the movement of the base in the axial direction with respect to the fixed block.

The stator for an electric valve according to claim 2 is the stator for an electric valve according to claim 1, wherein the fixing structure is configured to engage a locking piece of the outer plate with a projection of the fixing block to restrict movement of the outer plate in a direction in which the coupling plate is separated from the fixing block.

The stator for an electric valve according to claim 3 is the stator for an electric valve according to claim 2, wherein the locking piece of the outer plate is a locking arm that protrudes in a direction intersecting the axis at the end in the axial direction of the outer plate, and the protrusion of the fixing block is a pair of protruding strips that sandwich a recess into which the outer plate is fitted.

The stator for an electric valve according to claim 4 is the stator for an electric valve according to claim 3, wherein the pair of ribs have conical surfaces for guiding the locking arms from a side of the fixing block facing the coupling plate.

The electrically operated valve according to claim 5 includes the stator for an electrically operated valve according to any one of claims 1 to 4 in the valve device.

The effects of the present invention are as follows.

According to the stator for an electric valve of claims 1 to 4, since the fixing block is formed outside the end portion of the coil in the axial direction, the fixing structure for restricting the movement of the base portion of the elastic member in the axial direction with respect to the fixing block is formed by the fixing block and the outer plate of the base portion, and the fixing structure is located within the width of the fixed block in the axial direction square, a part of the base portion of the elastic member or the like does not protrude toward the coil (winding) side, and the damage of the coil is prevented and the deterioration of the insulation property due to the water immersion from the elastic member is also prevented.

According to the motor-operated valve of claim 5, the same effects as those of claims 1 to 4 can be obtained.

Drawings

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

Fig. 2 is a longitudinal sectional view and a bottom view of the stator for the electric valve according to the first embodiment.

Fig. 3 is an inverted external view and an inverted bottom view of the coil portion of the stator for an electric valve according to the first embodiment.

Fig. 4 is a diagram showing a bracket according to the first embodiment.

Fig. 5 is a view showing the periphery of the fixed block in the first embodiment.

Fig. 6 is a diagram showing a state in which the bracket of the first embodiment is attached to the fixed block.

Fig. 7 is a diagram showing an engagement state of the bracket and the housing in the first embodiment.

Fig. 8 is an enlarged view of a main portion of a stator for an electric valve according to a second embodiment.

Fig. 9 is a diagram showing a modification of the bracket according to the embodiment.

In the figure: 1-bracket (elastic part), 11-base, 11 a-outer panel, 11B-inner panel, 11 c-link, 11a 1-locking arm (locking piece), 12-elastic piece, 12 a-convex part, 51-gap, 52-embedded groove, 53-protrusion (protruding part), 53 a-conical surface, 53B-locking end, 54-concave part, 20-stepping motor (motor part), 21-stator (stator for electric valve), 21 a-coil rack, 21B-coil, 21H-insertion hole, 21H 1-opening part, 21K-skirt part, 21B-fixed block, 22-magnetic rotor, 30-valve body (valve device), 40-housing (valve device, cylindrical part), 40A-small diameter part, 40B-large diameter part, L-axis.

Detailed Description

Next, embodiments of the stator for an electric valve and an electric valve according to the present invention will be described with reference to the drawings. 3 fig. 31 3 is 3a 3 partially 3 sectional 3 side 3 view 3 of 3 an 3 electric 3 valve 3 according 3 to 3a 3 first 3 embodiment 3, 3 fig. 32 3 is 3a 3 longitudinal 3 sectional 3 view 3 and 3a 3 bottom 3 view 3 of 3a 3 stator 3 for 3 an 3 electric 3 valve 3 according 3 to 3 the 3 first 3 embodiment 3, 3 fig. 32 3( 3B 3) 3 is 3a 3 sectional 3 view 3 taken 3 along 3a 3 line 3a 3- 3a 3 in 3 fig. 31 3, 3 and 3 fig. 32 3( 3a 3) 3 is 3a 3 sectional 3 view 3 taken 3 along 3a 3 line 3B 3- 3B 3 in 3 fig. 32 3( 3B 3) 3. 3 Fig. 3 is an inverted external view and an inverted bottom view of a coil portion of the stator for an electric valve according to the first embodiment, and fig. 3(B) is a cross-sectional view E-E of fig. 3(a) before the bracket is attached. Fig. 4 is a view showing the bracket according to the first embodiment, fig. 5 is a view showing the periphery of the fixed block according to the first embodiment, and fig. 6 is a view showing a state in which the bracket according to the first embodiment is attached to the fixed block. The concept of "up and down" in the following description corresponds to up and down in the drawing of fig. 1.

As shown in fig. 1 and 2, the motor-operated valve includes a bracket 1 serving as an "elastic member", a stepping motor 20 serving as a "motor unit", a valve main body 30, and a cylindrical housing 40 made of a nonmagnetic material. The stepping motor 20 includes a stator 21, which is a "stator for electric valve" described later, attached to the outer periphery of the housing 40, and a magnetic rotor 22 rotatably disposed inside the housing 40. A predetermined gap is provided between the outer peripheral surface of the magnetic rotor 22 and the inner peripheral surface of the housing 40.

The valve main 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. The valve main body 30 is operated by driving the stepping motor 20 (rotation of the magnetic rotor 22), and controls the flow rate of the fluid flowing from the first joint 31 to the second joint 32 or the flow rate of the fluid flowing from the second joint 32 to the first joint 31.

The case 40 is airtightly attached to the upper end of the outer case 310 of the valve main body 30 by welding or the like, and thereby the valve main body 30 and the case 40 constitute a "valve device".

The stator 21 is configured by winding

coils

21a and 21b around a resin bobbin 21a and laminating a pair of coil portions in the direction of the axis L. Further, a yoke (yoke) 21c having magnetic pole teeth 21d is integrally assembled on the bobbin 21a by molding. The stator 21 has a cylindrical insertion hole 21H centered on the axis L at the center, and the magnetic pole teeth 21d of the yoke 21c are disposed on a part of the inner peripheral surface of the insertion hole 21H. The magnetic pole teeth 21d are disposed to face the outer peripheral surface of the housing 40.

With the above configuration, the coil 21b generates magnetic lines of force by applying a pulse output to the coil 21b to the stepping motor 20. As a result, the magnetic poles (N, S poles) are alternately changed in the magnetic pole teeth 21d, and magnetic attraction force and magnetic repulsion force are generated with respect to the magnetic rotor 22, whereby the magnetic rotor 22 is rotated. Accordingly, the valve member inside the valve body 30 operates to variably control the opening degree of the valve port, thereby controlling the flow rate of the refrigerant flowing from the first joint pipe 31 to the second joint pipe 32 or from the second joint pipe 32 to the first joint pipe 31 as described above.

The bottom of the bobbin 21a of the stator 21 on the valve body 30 side has a skirt 21K that expands in diameter from the opening 21H1 of the insertion hole 21H to the valve body 30. The housing 40 is configured with a small diameter portion 40A facing the outer periphery of the magnetic rotor 22 and a large diameter portion 40B having a diameter increased from the small diameter portion 40A toward the valve body 30 side with the axis L as a central axis. The small diameter portion 40A of the housing 40 is fitted into the insertion hole 21H of the stator 21, and a part of the large diameter portion 40B of the housing 40 is accommodated in the skirt portion 21K of the stator 21 in a state where the large diameter portion 40B of the housing 40 is positioned on the valve main body 30 side of the opening portion 21H 1. Thereby, the stator 21 is attached to the valve device. A bracket 1 as an "elastic member" is attached to the bottom of the stator 21.

Fig. 4 is a view showing the tray 1, fig. 4(a) is a view in the direction F of fig. 4(C), fig. 4(B) is a view in the direction G of fig. 4(C), and fig. 4(C) is a view in which the tray 1 in fig. 2(B) is extracted. As shown in the drawing, the bracket 1 includes a base 11 having a groove structure formed by press working or the like of a metal plate and including three plate-like portions, and an elastic piece 12 extending integrally with the base 11 from a side portion of the base 11. The base portion 11 includes an inner plate 11b on which the elastic piece 12 extends and which faces the outer plate 11a, and a connecting plate 11c which connects the outer plate 11a and the inner plate 11 b. The outer plate 11a has a pair of locking arms 11a1, 11a1 protruding in a direction intersecting the axis L (circumferential direction about the axis L) on both sides parallel to the axis L. The inner plate 11b has a claw 11b1 cut inward of the base 11. The elastic piece 12 has a convex portion 12a as a "first engaging portion" formed integrally with the elastic piece 12, a pressing portion 12b formed by bending a portion of the elastic piece 12 opposite to the base portion 11, and a fulcrum portion 12 c.

A fixing block 21B having a substantially rectangular parallelepiped shape is formed by a bobbin 21a at a part of a skirt portion 21K of the stator 21. That is, the fixed block 21B is formed on the outer periphery of the opening 21H1 around the axis L of the insertion hole 21H, and is formed on the coil frame 21a outside the end of the coil 21B in the axis L direction. Fig. 5 is a view showing the periphery of the fixed block 12B, and fig. 5(B) is a cross-sectional view taken along line C-C of fig. 5 (a). Fig. 5(C) is a view from H-H direction of fig. 5 (a). In the bobbin 21a constituting the fixed block 21B, a slit 51 is formed on the inner side (the axis L side) of the fixed block 21B, and an insertion groove 52 is formed on the outer side of the fixed block 21B. Further, a pair of

projections

53, 53 having a conical surface 53a are formed on the outer side (side portion on the opposite side of the axis L) of the fixed block 21B, and a recess 54 into which the outer plate 11a of the bracket 1 is fitted is formed between the pair of

projections

53, 53. The bracket 1 is attached to the fixed block 21B. Further, as shown in fig. 5(C), the long hole portion formed by the fitting groove 52 and the pair of

projections

53 and 53 in the bobbin 21a remains as a hole even after the bracket is attached, and when the molding material is filled, air bubbles are easily generated from the hole, and the molding material easily flows in the filled portion.

When the bracket 1 is attached to the fixed block 21B, the inner plate 11B and the claw 11B1 of the bracket 1 fit into the slit 51 inside the fixed block 21B, and the outer plate 11a fits outside the fixed block 21B. At this time, the outer plate 11a and the inner plate 11b are slightly opened against the elastic force of the base 11, and the locking arms 11a1, 11a1 of the outer plate 11a slide on the

conical surfaces

53a, 53a of the

projections

53, 53. Then, the locking arms 11a1, 11a1 go over the projections 53, and as shown in fig. 6, the outer panel 11a is fitted into the recess 54 by the elastic restoring force of the base 11, and the locking arms 11a1, 11a1 are engaged with the engaging ends 53b, 53b of the

projections

53, 53.

accordingly, the engagement ends 53B and 53B of the projections 53 and the locking arms 11a1 and 11a1 regulate the movement of the outer plate in the direction in which the base 11 is separated from the fixed block 21B, and in the natural state (fig. 4 a) of the bracket 1, the inner angle α between the outer plate 11a and the coupling plate 11c is set to α < 90 °, the fixed block 21B is substantially rectangular, and the fixed block 21B is substantially perpendicular to the side surface (recess 54) of the fixed block 21B, whereby in the mounted state of the bracket 1, the outer plate 11a and the inner plate 11B act so as to sandwich the fixed block 21B by the elastic force of the base 11, and the bobbin 21a is made of resin, and in the mounted state of the bracket 1, the claw 11B1 of the inner plate 11B bites into the inner surface of the fixed block 21B by the claw 1 of the inner plate 11B1, whereby the bracket 1 is prevented from being separated from the fixed block 21B in the axial L direction, and is firmly fixed to the fixed block 21B, and thus, in this embodiment, the coil length of the coil-holding arm 11 a-2-B-2, the coil-holding length dimension is equal to the coil-2 length dimension between the coil-2 length of the coil-holding arm-2-B-2-3 coil-2-3 coil-B-2 coil-B-3-2-B-is located distance between the coil-3 coil-2 coil-fixed-B-.

As described above, in the state where the bracket 1 is attached to the stator 21, the elastic piece 12 is disposed at a position facing the opening 21H1 in the skirt 21K located outside the periphery of the opening 21H1 of the insertion hole 21H of the stator 21. As shown in fig. 2B, the convex portion 12a of the elastic piece 12 protrudes toward the center (toward the axis L) of the skirt 21K of the stator 21. As shown in fig. 1, the case 40 has a plurality of recesses 40a formed on the outer periphery of the large diameter portion 40B and configured to engage with the protrusions 12a of the bracket 1. In this embodiment, 5 are formed.

Fig. 7 is a diagram showing an engagement state of the bracket 1 and the housing 40, and the convex portion 12a of the bracket 1 and the concave portion 40a of the housing 40 are engaged with each other in a state where the stator 21 is assembled to the valve device. Thus, the stator 21 is mounted to the housing 40 in a state where the stator 21 is prevented from being detached in the direction of the axis L while the stator 21 is positioned with respect to the housing 40 around the axis L. As shown in fig. 7, the elastic piece 12 brings the fulcrum portion 12c into contact with the inner periphery of the skirt portion 21K in a state where the pressing portion 12 is brought into contact with the outer periphery of the housing 40. Thereby, the elastic piece 12 presses the case 40 with the fulcrum portion 12c as a fulcrum by the elastic force of the elastic piece 12 itself. Thereby, the case 40 is sandwiched between the elastic piece 12 and the opposing inner walls of the opening 21H1 on the opposite side of the elastic piece 12.

As described above, in this embodiment, the bracket 1 as the elastic member has the elastic piece 12 engaged with the valve device and the base portion 11 fixed to the fixed block 21B, and the base portion 11 is configured such that the outer plate 11a and the inner plate 11B sandwiching the fixed block 21B in the radial direction of the fitting hole 21H are integrated with each other by the connecting plate 11 c. The fixing block 21B and the outer plate 11a of the base 11 are positioned within the width W1 in the direction of the axis L of the fixing block 21B, and a fixing structure for restricting the movement of the base 11 in the direction of the axis L with respect to the fixing block 21B is provided. Further, since the fixed block 21B is formed outside the end portion of the coil 21B in the direction of the axis L and the fixed structure for restricting the movement of the base 11 of the bracket 1 in the direction of the axis L with respect to the fixed block 21B is formed by the fixed block 21B and the outer plate 11a of the base 11 and the fixed structure is located within the width W1 in the direction of the axis L of the fixed block 21B, a part of the base 11 of the bracket 1 (the outer plate 11a and the like) does not protrude toward the coil 21B side, and damage to the coil 21B is prevented and deterioration of insulation due to water immersion from the bracket 1 can be prevented.

In this embodiment, as shown in fig. 4, the bracket 1 is formed with an arc-shaped notch 11a2 at the root of the belt locking arm 11a 1. Thus, the engagement ends 53b, 53b of the

projections

53, 53 can reliably abut against the horizontal linear portions of the engagement arm 11a 1. Further, the end portion of the outer panel 11a including the locking arm 11a1 is slightly bent outward in the middle of the notch 11a 2. This enables the locking arm 11a1 to smoothly slide on the

conical surfaces

53a, 53 a.

Fig. 8 is an enlarged view of a main portion of a stator for an electric valve according to a second embodiment, and the structure is the same as that of the first embodiment except for the portion shown in fig. 8. Note that the same elements as those in the first embodiment are elements that exhibit the same operational effects, are denoted by the same reference numerals as those in fig. 1 to 7, and redundant description thereof is omitted as appropriate. The second embodiment differs from the first embodiment in the fixing structure in that a rectangular hole 11a3 is formed in the outer side plate 11a of the base 11 of the bracket 1 and a rectangular protrusion 55 is formed on the outer side of the fixing block 21B. When the base portion 11 is fitted into the fixing block 21B, the projection 55 is engaged with the hole 11a3 of the outer plate 11 a. Thus, the engagement end 55B of the projection 55 and the outer peripheral piece 11a4 on the outer side of the hole 11a3 regulate the movement of the outer panel 11a in the direction in which the base 11 separates from the fixed block 21B. In this embodiment, the outer peripheral piece 11a4 of the outer panel 11a is an "engaging piece", and the protrusion 55 of the fixed block 2 is a "protrusion". The outer peripheral piece 11a4 and the protrusion 55 form a "fixed structure", and the outer peripheral piece 11a4 and the protrusion 55 are located within the width W1 in the axis L direction of the fixed block 21B.

In the bracket 1 of the above embodiment, the cut-out portion 12A is formed in a part of the elastic piece 12. In order to provide the projection 12a on the bracket 1, the elastic piece 12 needs to have a certain width, and in the bracket of the electromagnetic actuator shown in patent document 2, since the bracket has no cut-out portion and the elastic force of the bracket is too strong, the bracket is hard and difficult to put in when the bracket is inserted for fixing the electromagnetic actuator on the valve body, and the assembling workability may be poor. However, in the embodiment, since the elastic force of the elastic piece 12 can be adjusted by providing the cut-out portion 12A in a portion not cushioning the convex portion 12A, the stator can be easily inserted while maintaining the holding and fixing strength of the valve device, and the assembling property can be improved. In particular, it is effective that the cut-out portion is provided so as to straddle the fulcrum portion 12c and the bent portion 12d which are the bent portions of the bracket. In addition, the elastic force can be freely adjusted by changing the width, height, and number of the cut-off portions. Fig. 9 is a view showing a modification of the bracket 1, and fig. 9(B) is a cross-sectional view taken along line D-D of fig. 9 (a). The bracket 1 of this modification is configured to have a cutout portion 12A' by providing an opening in a portion of the pressing portion 12 b. That is, the cut-out portion for adjusting the elastic force may be a notch or a hole. In the bracket shown in fig. 9, the supporting portion 12c and the bent portion 12d are provided with notches (cut-out portions), the pressing portion 12b is provided with openings (cut-out portions), and the elastic force is adjusted at three positions, but the number of such cut-out portions is not limited to 3, and may be 1 or 2. In addition, it is needless to say that the elastic force can be adjusted by adjusting the large amount of each cut portion.

While the embodiments of the present invention have been described in detail with reference to the drawings, the specific configurations are not limited to these embodiments, and design changes that do not depart from the spirit and scope of the present invention are also included in the present invention.

Claims

1. A stator for an electric valve, which is attached to a valve device operated by driving of a motor unit, and which is configured by a coil built in with a magnetic rotor on the valve device side,

an insertion hole into which the valve device is inserted, and an elastic member which engages with the valve device and fixes the stator for the electric valve and the valve device,

a fixed block is formed on an outer periphery of an opening portion of the insertion hole around the axis, the fixed block being located outside an end portion of the coil in the axis direction, and the elastic member includes an elastic piece engaged with the valve device and a base portion fixed to the fixed block,

the base is formed by integrating an outer plate and an inner plate sandwiching the fixed block in a radial direction of the insertion hole with a connecting plate,

the fixing structure is configured by the fixing block and the outer plate of the base, is positioned within the width of the fixing block in the axial direction, and restricts the movement of the base in the axial direction with respect to the fixing block.

2. The stator for an electric valve according to claim 1,

the fixing structure is configured to engage the engagement piece of the outer panel with the projection of the fixing block, and to restrict movement of the outer panel in a direction in which the coupling plate of the base portion is separated from the fixing block.

3. The stator for an electric valve according to claim 2,

the locking piece of the outer plate is a locking arm that protrudes in a direction intersecting the axis at the end in the axial direction of the outer plate, and the protrusion of the fixing block is a pair of protrusions that sandwich a recess into which the outer plate is fitted.

4. The stator for electric valve according to claim 3,

the pair of protruding strips have conical surfaces that guide the locking arms from the side of the fixing block that faces the coupling plate.

5. An electric valve is characterized in that the electric valve is provided with a valve body,

the valve device is provided with the stator for an electric valve according to any one of claims 1 to 4.