JP2005287152A - Electromagnetic coil of stepping motor in motor-driven valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electromagnetic coil in which the countermeasure of anti-rust is not necessary to a welded part and a man hour and a cost are reduced without increasing a product size. <P>SOLUTION: The electromagnetic coil of a stepping motor in a motor-driven valve includes a first bobbin part 12 in which a first coil 12b is wound on a first bobbin body 12a and the outer peripheral part of the first coil is covered with a resin mold 15, a second bobbin part 12' in which a second coil 12'b is wound on the second bobbin body 12'a and the outer peripheral part of the second coil is covered with the resin mold 15, and pole boards 14, 14' sandwiched between the first bobbin part 12 and the second bobbin part 12'. As a means for covering the first bobbin part 12 and the second bobbin part 12' with stator covers 11, 11', respectively and fixing them, a protrusion 15a is formed on the first, second bobbins 12, 12' or the resin mold 15. An ultrasonic wave is applied to the protrusion 15 to be made to a deformable state and integrated. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an electromagnetic coil of a stepping motor in an electric valve used for an air conditioner, a refrigeration cycle of a refrigeration apparatus, and the like.

Conventionally, an electromagnetic coil of a stepping motor in a motor-operated valve incorporated and used in this type of air conditioner, refrigerator, or the like is disclosed in Patent Document 1 below as a conventionally known motor-operated valve.
JP 2001-86684 A

  The electric valve disclosed in Patent Document 1 will be described with reference to FIG. FIG. 15 shows a longitudinal sectional view of the motor-operated valve. The electromagnetic coil of the stepping motor of the motor-operated valve 1 has a coil A (1b) wound around the bobbin body A (1a) and the coil is externally connected. The connector pin A (1c) for connecting to the bobbin is integrally formed to form the bobbin sub-assembly A (1), and the coil B (2b) is wound around the bobbin main body B (2a). A connector pin B (2c) for connecting the external body to the outside is integrally provided to form a bobbin sub-assembly B (2), and between the bobbin sub-assembly A (1) and the bobbin sub-assembly B (2) Is provided by sandwiching two magnetic pole plates (3) and (4), the outer peripheral portions of the coil A (1b) and the coil B (2b), the connector pin A (1c) and the connector pin B (2c). ) With resin mold (5) to cover the part The connector pin A (1c) and the connector pin B (2c) are formed with a connector (6) having an umbrella on the entire periphery, and the molded bobbin sub-assembly A (1) and The bobbin sub-assembly B (2) is covered with stator covers (8) and (9), respectively, and is fixed integrally by welding or caulking.

  In addition, as a conventionally known specific embodiment, a dedicated joint member may be used separately in place of the welding or caulking.

However, in such an electric valve pole tooth component fixing method, the antirust plating of the stator cover is removed by welding, caulking, etc. There is a problem that a separate dedicated joint member is required and costs are increased.
Therefore, the present invention was invented to solve such a problem, and the problem is that a stepping motor in an electric valve that does not require a rust prevention measure or a separate dedicated joint member in the welded portion and reduces man-hours and costs. The electromagnetic coil will be provided.

In order to achieve the above object, the present invention employs the following means.
The electromagnetic coil of the stepping motor in the motor-operated valve according to claim 1 includes a first bobbin portion in which a first coil is wound around a first bobbin body, and a second bobbin portion in which a second coil is wound around a second bobbin body. The electromagnetic coil of the stepping motor that covers the stator cover integrally with the magnetic pole plate sandwiched between both bobbin portions and covers the stator cover, and as means for fixing the stator cover, the first and first A protrusion is formed on the two bobbin part or the resin mold, and the protrusion is deformed.

The electromagnetic coil of the stepping motor in the motor-operated valve according to claim 2, wherein the deformation is performed by applying an ultrasonic wave to the stator cover or the resin mold, and the stator cover is fitted to the resin mold in a state where the protruding portion is deformable. It is characterized by that.
The electromagnetic coil of the stepping motor in the motor-operated valve according to claim 3 is the means according to claim 2, wherein the protruding portion is formed by extending to the portion where the stator cover is located on the outer peripheral portion of the resin mold. In a state where the projecting portion can be deformed, and press-fitting.

  The electromagnetic coil of the stepping motor in the motor-operated valve according to claim 4 is the means according to claim 1 or 2, wherein the protrusion is formed on the first bobbin main body and the second bobbin main body, and each stator The cover is formed with a hole through which the protrusion is inserted, and the protrusion is deformed to prevent the protrusion from being inserted in the state where the protrusion is inserted into the hole.

The electromagnetic coil of the stepping motor in the motor-operated valve according to claim 5 is characterized in that, in the means according to claim 4, the deformation is rivet-processed by applying an ultrasonic wave to the protruding portion.
The electromagnetic coil of the stepping motor in the motor-operated valve according to claim 6 is the means according to claim 1 or 2, wherein the protrusion is formed in a direction in which the outer periphery of the resin mold is covered with the stator cover, and the stator The cover is formed with a slit for fitting with the protruding portion in the covering direction.

  The electromagnetic coil of the stepping motor in the motor-operated valve according to claim 7 is characterized in that, in the means according to claim 6, the resin mold and the stator cover are fastened by applying an ultrasonic wave to the protruding portion from the side surface. To do.

  According to the present invention, the configuration and the manufacturing process of the electromagnetic coil are simplified, the countermeasure for rust prevention is not required for the welded portion, and the man-hour and cost are reduced.

  Hereinafter, Example 1-3 of the present invention will be described.

Example 1 will be described with reference to the drawings. 1 is a longitudinal sectional view of the electromagnetic coil, FIG. 2 is a sectional view showing a first stage of the assembly process of the electromagnetic coil, FIG. 3 is a sectional view showing the second stage, and FIG. 4 is a main part of the assembly process. It is explanatory drawing shown.
As shown in FIG. 1, the electromagnetic coil 10 of this stepping motor has a first bobbin portion in which a first coil 12b is wound around a first bobbin main body 12a, and an outer peripheral portion of the first coil 12b is covered with a resin mold 15. 12, a second bobbin body 12′a having a second coil 12′b wound around the second bobbin main body 12′a, and an outer peripheral portion of the second coil 12′b covered with a resin mold 15, and a first bobbin Two magnetic pole plates 14 and 14 ′ sandwiched between the portion 12 and the second bobbin portion 12 ′, first and second stator covers 11 and 11 ′, a connector 16, and a connector case 17. Become. Further, a first connector pin 13 and a second connector pin 13 ′ are attached to the lower portion of the first bobbin main body 12a and the upper portion of the second bobbin main body 12′a, respectively.

  A projecting portion 15 a is formed on the outer peripheral lower portion of the resin mold 15 so as to extend to a portion where the stator covers 11, 11 ′ are located on the outer peripheral portion of the resin mold 15. Further, when the first and second stator covers 11, 11 ′ are mounted on the first bobbin portion 12 and the second bobbin portion 12 ′, the stator cover 11, 11 'is integrated (press-fit), and the contact strength is high.

Next, the manufacturing process will be described.
As shown in FIG. 2, the electromagnetic coil 10 is first prepared with four members, that is, a first bobbin portion 12, a first pole magnetic plate 14, a lower pole magnetic plate 14 ′, and a second bobbin portion 12 ′. These are integrated and molded with resin to form a resin mold 15. Further, a step portion is formed on the outer edge 14 b of the bottom plate 14 a in the first pole plate 14.

  The state of this manufacturing process is shown in FIG. 3. A connector support 15b is formed on one side of the outer periphery of the resin mold 15, and the lower periphery of the resin mold 15 other than the connector support 15b is formed. Thus, a protruding portion 15a is integrally formed in a step shape at a position where an outer peripheral plate 11a of the first stator cover 11 described later contacts. Further, a stepped portion that can be engaged with the outer end edge 14b is formed at the lower end 11b of the outer peripheral plate 11a. As shown in FIG. 3, the first stator cover 11, the second stator cover 11 ′, the connector 16, and the connector case 17 are further prepared and integrated.

As shown in FIG. 4 from the state of FIG. 3, this integration is performed by pressing and fitting the first stator cover 11 from the top to the bottom with respect to the first bobbin portion 12, and the second bobbin portion 12 ′. On the other hand, the second stator cover 11 'is pressed and fitted from the bottom to the top, and at the same time, the projecting portion 15a is made deformable by ultrasonic waves so that the stator covers 11, 11' are press-fitted.
Before and after the above process, the connector 16 and the connector case 17 are attached to the connector support portion 15b. Then, the process is completed with the outer peripheral plate lower end 11b engaged with the outer end edge 14b. In the electromagnetic coil 10 according to the first embodiment, welding, caulking, and the like are not required due to the above-described configuration, so that a countermeasure for preventing rust is not required at the fastening portion, and a dedicated joint member is not required separately. There is an effect such as not taking.
In addition, although the said protrusion part 15a may be formed in the whole lower outer peripheral part of the resin mold 15, it is good also as several places partially. In addition, the shape of the protrusion 15a can be selected as appropriate.

  Next, Example 2 will be described with reference to the drawings. 5 is a longitudinal sectional view of the electromagnetic coil, FIG. 6 is a sectional view showing the first stage of the assembly process of the electromagnetic coil, FIG. 7 is a sectional view showing the second stage of the assembly process, and FIG. 8 is the assembly process. FIG. 9 is a plan view of the electromagnetic coil of the second embodiment.

  As shown in FIG. 5, the electromagnetic coil 20 of the stepping motor includes a first bobbin portion 22 in which a first coil 22 b is wound around a first bobbin main body 22 a and an outer peripheral portion of the first coil 22 b is covered with a resin mold 25. A second bobbin portion 22 'in which a second coil 22'b is wound around the second bobbin main body 22'a and the outer peripheral portions of the first and second coils 22b, 22'b are covered with a resin mold 25; From the two magnetic pole plates 24 and 24 ′ sandwiched between the bobbin portion 22 and the second bobbin portion 22 ′, the first and second stator covers 21 and 21 ′, the connector 26, and the connector case 27 This is the same as in the first embodiment.

  Protrusions 22c and 22'c are integrally formed at a plurality of positions on the upper surface of the first bobbin main body 22a and at a plurality of positions on the lower surface of the second bobbin main body 22'a, and are formed on the stator covers 21 and 21 '. Is formed with holes 21c and 21'c through which the protrusions 22c and 22'c are inserted, and the protrusions 22c and 22'c are inserted into the holes 21c and 21'c, respectively. 22′c is deformed to form deformed projecting portions 22d and 22′d, which are used as stoppers.

Next, the manufacturing process will be described.
As shown in FIG. 6, the electromagnetic coil 20 is first prepared with four members, that is, a first bobbin portion 22, a first pole magnetic plate 24, a lower pole magnetic plate 24 ′, and a second bobbin portion 22 ′. These are integrated and molded with resin to form a resin mold 25. Further, a step portion is formed on the outer edge 24 b of the bottom plate 24 a in the first pole plate 24.

  This state is shown in FIG. 7, and a connector support portion 25b is formed on one side of the outer peripheral portion of the resin mold 25, and the outer peripheral plate lower end 21b of the outer peripheral plate 21a is connected to the outer end edge 24b. A stepped portion is formed. Then, as shown in FIG. 7, the first stator cover 21, the second stator cover 21 ′ connector 26, the connector case 27 and the stopper 28 are further prepared and integrated.

  In this integration, from the state shown in FIG. 7, the first stator cover 21 is pressed and fitted from the top to the bottom with respect to the first bobbin portion 22, and the second stator with respect to the second bobbin portion 22 ′. The cover 21 'is pressed and fitted from the bottom to the top, and the protrusions 22c and 22'c are inserted into the holes 21c and 21'c. Thereafter, the protruding portion 22′c protruding from the second stator cover 21 ′ is inserted into the hole 28a formed in the stopper 28 so as to face the protruding portion 22′c. In this state (see FIG. 8A), the projecting portions 22c and 22′c are riveted by applying ultrasonic waves to form deformed projecting portions 22d and 22′d (see FIG. 8B). The stator covers 21 and 21 'are integrated (prevented from coming off). Before and after this step, the connector 26 and the connector case 27 are attached. The state after the mounting is shown in FIG. According to the second embodiment, the stator covers 21 and 21 ′ and the stopper 28 can be attached simultaneously by one rivet process.

  With the above configuration, the electromagnetic coil 20 according to the second embodiment does not require rust prevention measures at the fastening portion and does not require a dedicated joint member. It should be noted that the cross-sectional shapes of the protrusions 22c and 22'c can be selected as appropriate.

Next, Example 3 will be described with reference to the drawings. 10 is a longitudinal sectional view of the electromagnetic coil of the third embodiment, FIG. 11 is a sectional view showing the first stage of the assembly process of the electromagnetic coil, FIG. 12 is a sectional view showing the second stage, and FIG. 13 is the assembly process. FIG. 13 is a plan view of the electromagnetic coil of the third embodiment, and FIG. 14 is an explanatory view showing the main part of the assembly process.
As shown in FIG. 10, the electromagnetic coil 30 of the stepping motor includes a first bobbin portion in which a first coil 32 b is wound around a first bobbin main body 32 a and an outer peripheral portion of the first coil 32 b is covered with a resin mold 35. 32, a second bobbin portion 32 'in which a second coil 32'b is wound around a second bobbin main body 32'a, and an outer peripheral portion of the second coil 32'b is covered with a resin mold 35, and a first bobbin Two magnetic pole plates 34, 34 ′ sandwiched between the portion 32 and the second bobbin portion 32 ′, first and second stator covers 31, 31 ′, a connector 36, and a connector case 37. Become.

  And as shown in FIG. 13, the protrusion part 35a is formed in the up-down direction in several places of the outer periphery lower part of the resin mold 35, and when covering the stator covers 31, 31 ', the stator covers 31, 31' A slit 31b into which the protruding portion 35a is fitted and an enlarged portion 31c following the slit 31b are formed in the covering direction. After the press-fitting and fitting, the side surface of the protruding portion 35a is deformed by applying an ultrasonic wave to prevent it from coming off. Formed as part.

Next, the manufacturing process will be described.
As shown in FIG. 11, the electromagnetic coil 30 is first prepared with four members, that is, a first bobbin portion 32, a first pole magnetic plate 34, a lower pole magnetic plate 34 ', and a second bobbin portion 32'. These are integrated and molded integrally with resin to form a resin mold 35. Further, a stepped portion is formed in the alignment portion 34 b of the bottom plate 34 a in the first pole plate 34.

  This state is shown in FIGS. 12 and 13. A connector support portion 35b is formed on one side of the outer peripheral portion of the resin mold 35, and a protrusion 35a having a predetermined width long in the vertical direction is formed on the other side. A plurality of places are formed (one place may be used). Further, a slit 31b and an enlarged portion 31c following the slit 31b are formed in the covering direction at a portion where the protruding portion 35a of the outer peripheral plate 31a of the first stator cover 31 is located. In addition, as shown in FIG. 12, a first stator cover 31, a second stator cover 31 ′, a connector 36, and a connector case 37 are prepared and integrated.

  In this integration, from the state of FIG. 12, the first stator cover 31 is pressed from the top to the bottom against the first bobbin portion 32, and the second stator cover 31 ′ is pressed against the second bobbin portion 32 ′. At the same time, as shown in FIG. 14, the projecting portion 35a is slide-fit into the slit 31b and the enlarged portion 31c following the slit 31b, or the first stator cover 31 and the second stator cover. While inserting ultrasonic waves into 31 ', it is inserted by sliding, and the insertion end of the slit 31b is deformed by applying ultrasonic waves in the enlarged portion 31c to prevent the stator covers 31, 31' from coming off. Yes.

  The electromagnetic coil 30 according to the third embodiment is advantageous in that, due to the above-described configuration, no countermeasure for rust prevention is required at the fastening portion and a dedicated joint member is not required separately, so that man-hours and costs are not required. Note that the shape of the protruding portion 35a may be formed by being appropriately inclined with respect to the axis of the stator covers 31, 31 ′. In the first to third embodiments, the means for applying the ultrasonic wave is used as the means for enabling deformation, but other means may be employed.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a longitudinal sectional view of an electromagnetic coil according to Example 1 of the present invention. Sectional drawing which shows the 1st step of the assembly process of the electromagnetic coil shown in FIG. Sectional drawing which shows the 2nd step of the assembly process. Explanatory drawing which shows the principal part of the same assembly process.

The longitudinal cross-sectional view of the electromagnetic coil of Example 2 of this invention. Sectional drawing which shows the 1st step of the assembly process of the electromagnetic coil shown in FIG. Sectional drawing which shows the 2nd step of the assembly process. Explanatory drawing which shows the principal part of the same assembly process. The top view of the electromagnetic coil of Example 2. FIG.

The longitudinal cross-sectional view of the electromagnetic coil of Example 3 of this invention. Sectional drawing which shows the 1st step of the assembly process of the electromagnetic coil shown in FIG. Sectional drawing which shows the 2nd step of the assembly process. The top view of the electromagnetic coil of the Example 3. FIG. Explanatory drawing which shows the principal part of the same assembly process. The longitudinal cross-sectional view of the conventional electromagnetic coil.

Explanation of symbols

10 .. Electromagnetic coil (Embodiment 1) 11. First stator cover 11a. Outer peripheral plate 11b. Lower end of outer peripheral plate 12. First bobbin portion 12a. First bobbin body 12b. First coil 13. -First connector pin 14-First pole plate 14a-Bottom plate 14b-Outer edge

11 ′ ·· second stator cover 11′a · outer peripheral plate 12 ′ ·· second bobbin portion 12'a ·· second bobbin body 12'b ·· second coil 13 '·· second connector pin 14' ..Lower magnetic plate 14'a..Upper bottom plate 14'b..Outer edge 15..Resin mold 15a..Protrusion 15b..Connector support 16..Connector 17..Connector case

20 .. Electromagnetic coil (Embodiment 2) 21 .. First stator cover 21a .. Outer peripheral plate 21b .. Outer peripheral plate lower end 21c .. Hole 22 .. First bobbin portion 22a. 1 coil 22c ··· projection 22d · · · deformation projection 23 · · first connector pin 24 · · first pole plate 24a · · bottom plate 24b · · outer edge

21 '·· Second stator cover 21'a ·· Outer plate 21'b ·· Outer plate lower end 21'c ·· Hole 22' ·· Second bobbin portion
22'a ··· second bobbin body 22'b ··· second coil 22'c · · projection 22'd · · deformation projection 24 '· · lower pole plate 24'a · · upper bottom plate 24'b · · Outer edge 25 · · Resin mold 25b · · Connector support 26 · · Connector 27 · · Connector case 28 · · Stopper 28a · · Hole

30..Electromagnetic coil (Example 3) 31..First stator cover 31a..Outer peripheral plate 31b..Slit 31c..Enlarged portion (prevention portion)
32 ··· First bobbin portion 32a ··· First bobbin body 32b · · First coil 34 · · First pole plate 34a · · Bottom plate 34b · · Positioning portion

31 '·· Second stator cover 31'a · Outer peripheral plate 31'b ·· Slit 32' ·· Second bobbin portion 32'a ·· Second bobbin body 32'b ·· Second coil 34 '·· Lower pole plate 34'a ··· Upper bottom plate 35, 35 '··· Resin mold 35a · · Projection portion 35b · · Connector support portion 36 · · Connector 37 · · Connector case

Claims (7)

A first bobbin portion in which a first coil is wound around a first bobbin body, a second bobbin portion in which a second coil is wound around a second bobbin body, and a magnetic pole plate sandwiched between both bobbin portions. An electromagnetic coil of a stepping motor that is integrally covered with a resin mold and covered with a stator cover,
An electromagnetic coil for a stepping motor in a motor-operated valve, characterized in that as a means for covering and fixing the stator cover, a protruding portion is formed on the first and second bobbin portions or a resin mold, and the protruding portion is deformed.   2. The stepping motor for an electric valve according to claim 1, wherein the deformation is performed by applying an ultrasonic wave to the stator cover or the resin mold, and the stator cover is fitted to the resin mold in a state where the protrusion is deformable. Electromagnetic coil.   The protruding portion is formed to extend to a portion where the stator cover is located on the outer peripheral portion of the resin mold, and the stator cover is press-fitted and fitted in a state where the protruding portion is deformable. Item 3. An electromagnetic coil of a stepping motor in the electric valve according to Item 2.   The protrusion is formed in the first bobbin main body and the second bobbin main body, and a hole through which the protrusion is inserted is formed in each stator cover, and the protrusion is inserted in the state where the protrusion is inserted into the hole. The electromagnetic coil of the stepping motor in the motor-operated valve according to claim 1 or 2, wherein the coil is deformed to prevent it from coming off.   The electromagnetic coil of the stepping motor in the motor-operated valve according to claim 4, wherein the deformation is rivet-processed by applying an ultrasonic wave to the protruding portion.   2. The protruding portion is formed in a direction in which a stator cover is placed on an outer peripheral portion of a resin mold, and a slit that fits the protruding portion is formed in the covering direction in the stator cover. Or the electromagnetic coil of the stepping motor in the motor operated valve of Claim 2.   The electromagnetic coil of the stepping motor in the motor-operated valve according to claim 6, wherein the resin mold and the stator cover are fastened by applying an ultrasonic wave to the protruding portion from a side surface.

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