JP4536432B2 - Electric valve motor - Google Patents

Description

  The present invention relates to an electric valve motor used in a refrigeration cycle, and more particularly to an electric valve motor having a sealed structure.

  Conventionally, a motor-operated valve used by being incorporated in an air conditioner, a refrigerator, or the like of this type is molded by covering a driving motor with a sealing material. In this sealing method, as shown in FIG. 7 in which the casting used in the sealing process is shown in cross section, the motor 1 is installed in a space 91 of a casting mold 9 made of, for example, silicon having a space for placing the motor. The resin is injected into the space formed between the motor 9 and the motor 1 and then cured to obtain a motor-valve motor sealing structure.

  In such a motor valve motor sealing method, as shown in FIG. 6, the resin casting 9 has a bottom portion in order to position and arrange the motor 1 in a space 91 formed inside. A plurality of, for example, four motor support portions 92 are provided, and lead wire spaces 93 are provided for drawing out the lead wires 13 of the motor 1 to the outside. The motor 1 is inserted into the internal space 91 of the casting mold 9, the motor 1 is placed on the motor support 92 and positioned, and then sealed in the remaining space 92 formed between the casting mold 9 and the motor 1. After injecting the agent and curing by heating, the motor 1 molded with the sealant 2 is taken out from the casting mold 9.

  As shown in FIG. 7A, which is a front view of the motor 1, and FIG. 7B, which is a bottom view, the motor 1 sealed in this way has a sealant in a portion in contact with the motor support member 92. 2 does not penetrate and an unmolded portion 29 is formed. Since the unmolded portion 29 becomes a boundary surface with the external space, the reliability of the seal is lowered. In order to improve the reliability, it is necessary to re-seal the unmolded portion 29 manually using a sealant. However, this operation is low in mass productivity and reliable. (For example, see Patent Document 1).

  Further, since the lead wire 13 disposed in the lead wire space 93 is not positioned, when the lead wire 13 is molded in contact with the inner wall surface of the casting 9, the lead wire 13 is exposed to the outside. Leads to a decrease in reliability. Further, even when the lead wire 13 is not exposed to the outside, when the thickness of the mold is uneven and the coating thickness of the sealing agent is reduced, or when bubbles are included in the sealing agent, the reliability is lowered. .

Furthermore, in such a manufacturing method, the resin casting 9 needs to be replaced after 7 to 8 times of use, which increases the manufacturing cost.
JP-A-1-131380

  In view of the above problems, an object of the present invention is to obtain an electric valve motor that can be manufactured at low cost and has a highly reliable sealing structure.

  In order to solve the above-mentioned problems, the present invention injects a sealant into the remaining space formed between the case and the motor after positioning the motor inside the resin case without using casting. Then, a molded motor was obtained by curing.

That is, the present invention includes a motor body in which components are incorporated in a motor housing, and a plurality of lead wires for supplying drive signals drawn from the rear part of the motor housing, and the lead wires are U-shaped. A synthetic resin container that accommodates the motor body in a folded state, and a plurality of positioning protrusions for determining the center position of the motor body are formed on the inner surface of the container, the motor mount supporting the state in which floated motor Yes formed integrally respectively, and heat-cured sealing agent after filling the sealant in the space between the container and the motor housing Configured.

  In the motor for an electric valve according to the present invention, a plurality of positioning protrusions for determining a center position of the motor main body are provided on the inner side surface of the container, and the motor is supported on a bottom surface portion of the motor in a floating state. The mounting tables were integrally formed. Furthermore, in the motor for an electric valve according to the present invention, a lead wire lead-out portion that accommodates the lead wire folded back in a U shape is integrally formed on the side portion of the container.

  In the motor for an electric valve according to the present invention, an inner width of the lead wire lead portion is formed to be slightly larger than a width of the lead wire, and the lead wire is formed on an upper portion of the inner side surface of the lead wire lead portion. An inclined guide surface was formed to guide the insertion of the bundle.

  With this sealing structure, the motor housing is not exposed to the outside of the mold, and a highly reliable and highly reliable sealing structure can be obtained.

  Furthermore, according to the present invention, it is possible to obtain a highly reliable sealing structure using an inexpensive resin case without using an expensive casting that is used less frequently.

  Hereinafter, a sealing structure of a motor for an electric valve according to the present invention and a manufacturing method thereof will be described with reference to the drawings. FIG. 1 is a cross-sectional view of a container and a sealant for explaining a sealing structure of an electric valve motor shown in an external view, and FIG. 2 (A) is an upper surface illustrating a state where the electric valve motor is accommodated in the container. FIG. 2 and FIG. 2B are left side views showing a cross section taken along line AA in FIG. 3A is a top view of the container, and FIG. 3B is a vertical cross-sectional perspective view taken along line BB in FIG. 3A. 4A is a top view of the motor, and FIG. 4B is a front view of the motor. FIG. 5 (A) is a top view of a container according to another embodiment of the present invention, and FIG. 5 (B) is a longitudinal sectional perspective view taken along the line CC of FIG. 5 (A).

  As shown in FIGS. 1 and 2, the motor-valve motor sealing structure according to the first embodiment of the present invention positions and mounts the motor 1 in a container 3 made of synthetic resin such as PBT. The space formed between the motor 3 and the motor 1 is filled with a sealing agent 2 made of, for example, an epoxy resin, and then the sealing agent 2 is heated and cured.

  The structure of the container 3 will be described with reference to FIGS. The synthetic resin container 3 is formed in a substantially cylindrical shape having a bottom 36. For example, four motor mounting bases 32 are formed on the bottom 36 so as to extend from the inner wall surface of the peripheral wall 31 toward the center. Further, for example, six motor positioning protrusions 33 protruding in the central direction and extending in the vertical direction are provided on the inner wall surface of the peripheral wall 31. In this embodiment, the protrusion 33 is formed in a mountain shape (substantially triangular cross-sectional shape), and its ridgeline makes line contact with the outer peripheral surface of the motor housing, which will be described later, to position the center of the motor body. The bottom surface 36 of the container 3 is provided with a recessed portion 361 in which the U-shaped folded portion 131 of the lead wire 13 of the motor 1 is accommodated. A step portion 34 is provided in an annular shape corresponding to the step portion 14 of the motor 1 at an intermediate portion of the peripheral wall 31 rising from the periphery of the bottom 36. A part of the peripheral wall 31 is provided with a lead wire lead-out portion 38 that constitutes a space for drawing out a lead wire at a position corresponding to the recess 361. The lead wire lead-out portion 38 has a lead wire lead-out portion 38 above the side wall when the motor body is inserted. An inclined surface 39 serving as a guide surface is provided. Further, the lead wire lead-out portion 38 is provided with a groove portion 37 in which the sealant casting nozzle 4 can be inserted so as to reach the recess portion 361.

  As shown in FIG. 2, the width W of the internal space of the lead wire lead-out portion 38 is formed slightly larger than the width w of the bundle of lead wires 13. By this and the inclined surface 39, the lead wire 13 can be easily inserted into the space 38 without damaging it.

  As shown in FIG. 4, the motor body 1 has components such as a motor body housed and sealed in an internal space of a motor housing formed by a motor case 11 and an upper lid 12, and is pulled out from the bottom of the motor case 11. The plurality of lead wires 13 for supplying the drive signal are drawn upward with a U-shaped folded portion 131 formed. An annular step 14 is provided in the middle of the motor case 11, and the upper end of the wide portion extending upward from the step 14 fixes the upper lid 12 by caulking. The upper lid 12 is provided with a drive unit 15 that opens and closes an electric valve (not shown) driven by the motor body.

  When the motor main body 1 is inserted into the internal space 35 of the container 3 having the structure shown in FIG. 3, the outer wall surface of the motor case 11 is guided by the motor positioning projections 33 and arranged and fixed on the motor mounting table 32. At this time, the lead wire 13 is guided by guide surfaces (slopes) 39 provided above both side surfaces of the lead wire lead-out portion 38, and the motor body 1 is accommodated in a predetermined position of the container 3. Thereafter, the sealant casting nozzle 4 (FIG. 2) for injecting the sealant is inserted into the sealant injection groove 37 until it substantially reaches the recess 361, and the upper cover 12 of the motor 1 is covered from the recess 361. Inject sealant 2 until. Further, when the sealant casting nozzle 4 is subsequently pulled out, the space formed by the pulling out is closed by the inflow of the sealant, and the sealant 2 is heated and cured, so that the mold of the motor body 1 is removed. Complete.

  The motor-operated valve having such a structure eliminates the unmolded portion 29 formed in the bottom portion of the motor housing as shown in FIG. 7 and can provide a highly reliable sealing structure. Further, according to the present invention, since the lead wire of the motor is inserted along the container, the lead wire portion is not missed, and a highly reliable sealing structure can be obtained. Furthermore, according to the present invention, it is possible to reduce the production cost by molding using the inexpensive resin container 3 without using the silicon casting mold 9 which is expensive and has a low durability.

  A second embodiment of the present invention will be described with reference to FIG. This embodiment is an example in which the sealant injection groove 37 of the container 3 does not protrude outward. That is, in this embodiment, ribs 381 and 381 protruding inwardly are provided inside the peripheral wall 31 of the lead wire lead-out portion 38, and sealant injection groove portions 371 and 371 are provided on both sides of the lead wire lead-out portion 38. Yes.

  By adopting such a structure, the second embodiment, which can achieve the same effects as the first embodiment, can further reduce the maximum size of the container as compared with the first embodiment. it can.

Sectional drawing of the container and sealing agent part explaining the sealing structure of the motor for motorized valves shown by the external view concerning the 1st Example of this invention. The upper side figure explaining the state which accommodated the motor for motorized valves in the container, and the left view which shows the cross section in the AA of FIG. 2 (A). The longitudinal cross-sectional perspective view (B) in the BB line of the top view (A) and FIG. 3 (A) of a container. The top view (A) of a motor and the front view (B) of a motor. The top view (A) of the container by the 2nd Example of this invention, and the longitudinal cross-sectional perspective view in the CC line of FIG. 5 (A) (B). Sectional drawing of the casting and sealing agent part which demonstrate the sealing method of the motor for motorized valves shown by the conventional external view. The external view front view (A) and bottom view of the motor for motor-operated valves obtained by the method of FIG.

Explanation of symbols

1: Motor body 11: Motor case 12: Upper lid 13: Lead wire 131: Lead wire folding portion 14: Step portion 15: Drive portion 2: Sealant 29: Unmolded portion 3: Container 31: Peripheral wall 32: Motor mounting table 33: Projection for motor positioning 34: Step part 35: Internal space 36: Bottom part 361: Recessed part 37: Sealant injection groove part 371: Sealant injection groove part 38: Lead wire extraction part 381: Rib 39: Guide surface (inclination) surface)
4: Casting nozzle 9: Casting

Claims (5)

A motor body in which components are incorporated in the motor housing, and a plurality of lead wires for supplying drive signals drawn from the rear of the motor housing,
A synthetic resin container that accommodates the motor body in a state where the lead wire is folded in a U-shape ;
A plurality of positioning protrusions that determine the center position of the motor body are formed on the inner side surface of the container, and a motor mounting table that supports the motor in a floating state is integrally formed on the bottom surface thereof. Yes,
Motor electric valve, characterized in <br/> by being configured heat-cured sealing agent after filling the sealant in the space between the motor housing and the container. Wherein the side of the container, the motor electric valve according to claim 1, characterized in that the lead wire outlet portion for accommodating the lead wire folded in a U-shape are integrally formed. Wherein the lead wire outlet portion, the motor electric valve according to claim 2, characterized that you have grooves casting nozzle is inserted is formed at the sealing agent injection. 4. The motor for an electric valve according to claim 2 , wherein an inner width of the lead wire lead-out portion is formed to be slightly larger than a width of the bundle of the lead wires . The inner surface upper portion of the lead wire outlet portion, the preceding claims 2 inclined guide surface for guiding the insertion of the bundle of the lead wires is characterized by the formation Citea Rukoto to any one of claims 4 The motor for electric valves as described.

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