JP2019212733A - Resistor for air fan speed control - Google Patents

Abstract

To mainly facilitate manufacture of heat slinger, while preventing short circuit between terminal parts effectively.SOLUTION: A laminate 15 is constituted by clamping both sides of a planar resistor 12 by means of a pair of heat slingers 14A, 14B via a pair of dielectric plates 13A, 13B. The laminate 15 is attached to the clamp face 17a of an attachment member 17 by one side part 16a, and terminal parts 21-24 extending from the planar resistor 12 toward the attachment member 17 are provided on one side part 16a of the planar resistor 12, in a resistor 11 for air fan speed control. A notch 31 extending linearly along the clamp face 17a of the attachment member 17 is provided in the one side part 16a of the heat slingers 14A, 14B. A plurality of terminal parts 21-24 are placed, at intervals of L1-L3, on the inside of the notch 31. At least one of terminal parts 21-24 is attached to the planar resistor 12 via a temperature fuse 34 and a leaf spring 35.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a blower speed control resistor.

  A vehicle such as an automobile is provided with an air conditioner, and the air conditioner is provided with a blower for supplying air for air conditioning. The blower has a blower fan and a blower motor. In the blower motor, a resistor (blower speed control resistor) is used as a speed adjuster for adjusting or changing the rotational speed of the blower motor (see, for example, Patent Document 1).

  The blower speed control resistor of Patent Document 1 has a laminated body in which both surfaces of a planar resistor are sandwiched by a pair of heat sinks via a pair of insulating plates. And the laminated body is attached in the standing state with respect to the attachment surface of the attachment member. A terminal portion extending from the planar resistor toward the mounting member is attached to one side of the planar resistor.

JP 2009-218471 A

However, the blower speed control resistor described in Patent Document 1 has the following problems.
That is, since the part to which the terminal portion is attached on one side of the heat sink has a complicated shape, it is difficult to manufacture the heat sink. In addition, a thermal fuse is provided to shut down the circuit when abnormal heat is generated. However, when the thermal fuse blows, if a molten solder lump enters between the terminals, there is a problem that a short circuit occurs between the terminals. It was.

  Therefore, the present invention mainly aims to solve the above-described problems.

In order to solve the above problems, the present invention provides:
A laminated body is formed by sandwiching both surfaces of a planar resistor with a pair of heat sinks via a pair of insulating plates, and the laminated body is mounted in a standing state on the mounting surface of the mounting member at one side. In the blower speed control resistor, the one side portion of the planar resistor is provided with a terminal portion extending from the planar resistor toward the mounting member.
The one side portion of the heat radiating plate is provided with a notch extending linearly along the mounting surface of the mounting member,
A plurality of the terminal portions are installed at intervals inside the notch portion,
At least one of the terminal portions is attached to the planar resistor via a thermal fuse and a spring plate.

  According to the present invention, the above configuration facilitates the manufacture of the heat sink and can effectively prevent a short circuit between the terminal portions.

It is a perspective view of the air blower provided with the resistor for air blower speed control concerning this Embodiment. It is a longitudinal cross-sectional view of the air blower of FIG. FIG. 2 is an overall perspective view of the blower speed control resistor of FIG. 1. It is the whole blower speed control resistor which looked at FIG. 3 from the other side. It is a disassembled perspective view of the resistor for blower speed control. It is a block diagram of the resistance part of the plane resistor provided in the resistor for blower speed control. It is a front view of the resistor for blower speed control which shows the insulating board which has an extension part. It is a side view of the resistor for blower speed control. FIG. 4 is a partially enlarged perspective view of FIG. 3 showing a thermal fuse and a spring plate. It is the elements on larger scale of the terminal part of FIG.

Hereinafter, the present embodiment will be described in detail with reference to the drawings.
1 to 10 are for explaining this embodiment.

  <Configuration> The configuration of this embodiment will be described below.

  As shown in FIGS. 1 and 2, an air conditioner 1 is provided in a vehicle such as an automobile. The air conditioner 1 is provided with a blower 3 for supplying air 2 for air conditioning. The blower 3 has a blower fan 4 and a blower motor 5. The blower fan 4 is accommodated in the housing 6.

  Here, the blower fan 4 is attached to the output shaft of the blower motor 5. The blower fan 4 is configured in a substantially cylindrical shape. A portion of the housing 6 that accommodates the blower fan 4 has a cylindrical shape that is slightly larger than the blower fan 4.

  The housing 6 has a suction portion 7 for air-conditioning air 2 at a portion opposite to the blower motor 5. The suction part 7 has an outside air inlet 7a and an inside air circulation port 7b, and the outside air inlet 7a and the inside air circulation port 7b are switched by a mode switching door 8. The housing 6 has a discharge port 9 for air-conditioning air 2 at the outer peripheral position. The discharge port 9 extends from the cylindrical housing 6 in a substantially tangential direction. However, the structure of the blower 3 is not limited to the above.

  In the blower motor 5, a resistor (blower speed control resistor 11) is used as a speed adjuster for adjusting or changing the rotational speed of the blower motor 5. The blower speed control resistor 11 is attached to a hole 9 a provided in the discharge port 9.

  As shown in FIGS. 3 to 5 (mainly, see the exploded perspective view of FIG. 5), the blower speed control resistor 11 has both sides of the planar resistor 12 interposed between a pair of insulating plates 13A and 13B. The laminate 15 is sandwiched between a pair of heat sinks 14A and 14B. The laminated body 15 is attached to the attachment surface 17a of the attachment member 17 in a standing state at one side portion 16a (lower side portion in the figure). Terminal portions 21 to 24 extending from the planar resistor 12 toward the mounting member 17 are provided on one side portion 16 a of the planar resistor 12.

  Here, the blower speed control resistor 11 is a circuit component for controlling the rotational speeds of the blower motor 5 and the blower fan 4 of the blower 3, and is used for a manual air conditioner, for example. By using the blower speed control resistor 11, for example, the air volume of the air conditioner 1 can be switched to three stages of large, medium, and small.

  The planar resistor 12 is a resistor formed in a planar shape and is made of a conductive material. The planar resistor 12 is used as a resistor for appropriately lowering the voltage applied to the blower motor 5. As shown in FIG. 6, the planar resistor 12 includes a plurality of resistance portions 12 </ b> A to 12 </ b> C having the same or different resistance values. The resistance portions 12A to 12C are formed of a resistance wire or a resistance foil having a zigzag shape or a spiral shape.

  In this embodiment, the planar resistor 12 is provided with three resistor portions 12A to 12C having different thicknesses and lengths. The three resistance portions 12A to 12C have three independent contact portions 12a to 12c that are independent from each other on one end side, and one common contact portion 12d that is connected to the other end side. The three resistor portions 12A to 12C are arranged so that the resistor portion 12B having the highest heating value is positioned at substantially the center of the plane resistor 12 (in the vertical and horizontal directions in the figure) so that the temperatures of the respective portions of the plane resistor 12 are equalized. In the center of the direction).

  More specifically, the planar resistor 12 is connected in the middle of the circuit connecting the blower motor 5 and the power source, and the rotational speed of the blower motor 5 is changed by switching the resistance portions 12A to 12C through which current flows by the air volume switching means. And adjust the air volume. For example, the air volume switching means includes a first path through which current flows between the independent contact portion 12b and the common contact portion 12d (the resistance portion 12B), the independent contact portion 12b, the common contact portion 12d, and the independent contact portion 12a. Between the second path through which current flows between (the resistance portion 12B and the resistance portion 12A), and between the independent contact portion 12b, the common contact portion 12d, and the independent contact portion 12c (the resistance portion 12B and the resistance portion 12C). The third path through which current flows can be switched. In this case, the first path (with resistance value: small) has an air volume = large, the second path has (total resistance value: with medium) air volume = medium, and the third path (with a total resistance value: large) ) Air volume = small. However, the configuration of the resistance units 12A to 12C and the current path to the resistance units 12A to 12C are not limited to the above.

  Returning to FIG. 5, the surfaces of the planar resistor 12, the insulating plates 13 </ b> A and 13 </ b> B, the heat radiating plates 14 </ b> A and 14 </ b> B, and the laminated body 15 have a substantially rectangular shape having four sides 16 a to 16 d that are substantially orthogonal to each other. Yes. On one surface of the planar resistor 12, an insulating plate 13A and a heat radiating plate 14A are arranged in contact with each other, and on the other surface of the planar resistor 12, an insulating plate 13B and a radiating plate 14B are arranged in contact with each other in order. 15 is constituted.

  The insulating plates 13A and 13B are for insulating the planar resistor 12 and the heat radiating plates 14A and 14B, and are made of an insulating material. The insulating plates 13A and 13B have substantially the same shape as the planar resistor 12 or a slightly larger shape.

  The heat sinks 14A and 14B are for releasing (dissipating heat) the heat generated by the planar resistor 12, and are made of a material having high thermal conductivity. The heat sinks 14A and 14B have substantially the same shape as or slightly larger than the insulating plates 13A and 13B and the planar resistor 12.

  Moreover, heat sink 14A, 14B has a function which integrates the laminated body 15 in the state which pinched | interposed the planar resistor 12 and insulating board 13A, 13B. For this purpose, the pair of heat radiation plates 14A and 14B are provided with fixing portions 18 (FIG. 3) that can be fixed to each other. The fixing portion 18 may be a crimped portion formed by a hole portion 18a provided in one heat radiating plate 14A and a claw portion 18b provided in the other heat radiating plate 14B. The planar resistor 12, the insulating plates 13 </ b> A and 13 </ b> B, and the heat sinks 14 </ b> A and 14 </ b> B are integrated into the laminated body 15 by bending (caulking) the claw 18 b through the claw 18 b into the hole 18 a. At this time, other members constituting the laminate 15, that is, the planar resistor 12 and the insulating plates 13 </ b> A and 13 </ b> B are provided with holes or notches for passing the claw portions 18 b as necessary. To do.

  The fixing part 18 is provided at two places on each of the three side parts 16 b to 16 d other than the one side part 16 a of the stacked body 15. The two caulking portions of the side portions 16a to 16d are preferably installed with substantially equal intervals so as not to cause unnecessary gaps in the stacked body 15. The fixing portion 18 may be provided with holes 18a and 18a communicating with each other between the pair of radiator plates 14A and 14B, and another caulking member such as a rivet may be attached between the holes 18a and 18a.

  Furthermore, the heat sinks 14 </ b> A and 14 </ b> B have a function of attaching the laminate 15 to the attachment member 17. For this purpose, a pair of insertion legs 19 that can be inserted and fixed to the mounting member 17 are provided on one side 16a of the heat radiating plates 14A and 14B. The insertion leg 19 is integrally extended toward the mounting member 17 from the heat radiating plates 14A and 14B. A support portion 19 a extending outward in the surface direction is provided at the distal end portion of the insertion leg portion 19. A fixing claw portion 19b that can be locked and fixed to the mounting member 17 by being bent in the out-of-plane direction while being inserted into the mounting member 17 is provided at the distal end portion of the support portion 19a. The fixing claw portion 19b is formed in a bifurcated shape so as to be bent in different directions. Furthermore, an out-of-plane curved part 19c (or a fall-preventing rib) for preventing the laminate 15 from falling in the out-of-plane direction is provided on the inner part of the support part 19a so as to face the insertion leg part 19 in a plane. ing. The out-of-plane curved portion 19c is bent in opposite directions (outward in the thickness direction of the laminate 15) between the heat radiating plate 14A and the heat radiating plate 14B.

  The laminated body 15 is formed by laminating the planar resistor 12, the pair of insulating plates 13 </ b> A and 13 </ b> B, and the pair of radiator plates 14 </ b> A and 14 </ b> B, and is a hole provided in the discharge port 9 in the housing 6 of the blower 3. The air-conditioning air 2 that flows through the discharge port 9 is cooled by being inserted and disposed from the outside of the discharge port 9 through the portion 9a to the inside of the discharge port 9 (FIG. 2). The laminate 15 is arranged in such a direction as to extend along the flow direction of the air-conditioning air 2 flowing through the discharge port 9.

  The one side portion 16a is the side closest to the mounting surface 17a of the mounting member 17 among the side portions 16a to 16d of the laminate 15 and its component parts. The one side portion 16 a is formed substantially parallel to the mounting surface 17 a of the mounting member 17. The one side portion 16a is a lower side portion in the figure.

  The attachment member 17 is a member that holds the laminated body 15, and is a member that is attached to the hole portion 9 a of the discharge port 9 from the outside in a state where the laminated body 15 is inserted and arranged inside the discharge port 9.

  The attachment surface 17a of the attachment member 17 is a surface for closing the hole 9a of the discharge port 9 to prevent air leakage from the hole 9a, and has substantially the same shape as the hole 9a (for example, substantially in plan view). (Rectangular shape).

  A male connector portion 17c is provided around the mounting surface 17a via a flange portion 17b that can contact the outer surface of the discharge port 9. The male connector portion 17c has a cylindrical frame shape so that a female connector provided in the circuit can be coupled. An attachment piece 17e having a screw hole 17d for screwing to the discharge port 9 is projected from the flange portion 17b and the male connector portion 17c. A reinforcing rib or the like can be appropriately provided between the flange portion 17b and the male connector portion 17c.

  A plurality of first attachments are provided on the attachment surface 17a of the attachment member 17 for inserting and fixing a support portion 19a, a fixing claw portion 19b and an out-of-plane curved portion 19c provided at the distal end portion of the insertion leg portion 19. A hole 17f and a plurality of second mounting holes 17g for penetrating the terminal portions 21 to 24 are provided. The insertion leg 19 is inserted into the first mounting hole 17f in a substantially straight state with respect to the mounting surface 17a. Further, the terminal portions 21 to 24 are inserted into the second mounting hole 17g in a substantially straight state with respect to the mounting surface 17a.

  The terminal portions 21 to 24 are strip-shaped conductive materials extending from the planar resistor 12 toward the male connector portion 17 c of the mounting member 17. The terminal portions 21 to 24 have a plane parallel to the planar resistor 12, one end portion is connected to the independent contact portions 12a to 12c and the common contact portion 12d of the planar resistor 12, and the other end portion is a second attachment. It protrudes into the male connector portion 17c through the hole 17g and serves as a contact point for the female connector. A claw portion 25 for bending and fixing to the mounting member 17 is appropriately provided at an intermediate portion of the terminal portions 21 to 24.

  In contrast to the basic configuration as described above, this embodiment has the following configuration.

(1) As shown in FIG. 7 (FIG. 8), a notch 31 that extends linearly along the mounting surface 17 a of the mounting member 17 is provided on one side 16 a of the heat sinks 14 </ b> A and 14 </ b> B.
A plurality of terminal portions 21 to 24 are provided inside the cutout portion 31 with intervals L1 to L3.
Furthermore, as shown in FIG. 9, at least one of the terminal portions 21 to 24 is attached to the planar resistor 12 via a thermal fuse 34 and a spring plate 35.

  Here, the notch 31 is provided at one central portion of the one side portion 16a of the heat radiating plates 14A and 14B in a size covering almost the entire area of the one side portion 16a. The notch 31 is provided in parallel with the mounting surface 17a. The insertion leg portion 19 described above is provided in the remaining portion (both ends of the one side portion 16a) where the cutout portions 31 of the heat radiating plates 14A and 14B are provided.

  The notch 31 is used for welding one end side (for example, the upper end side in the figure) of the terminal portions 21 to 24 to the planar resistor 12 (see the independent contact portions 12a to 12c, the common contact portion 12d, etc., FIG. 6). The mounting surface 17a is notched with a notch amount D of about 10 mm so as to ensure a space in which a welding jig of the welding apparatus can be inserted.

  A plurality of terminal portions 21 to 24 are provided according to the number of resistance portions 12A to 12C. The plurality of terminal portions 21 to 24 are installed in a state of being lined up inside the cutout portion 31 (formed only at one place). In the case of this embodiment, four terminal portions 21 to 24 are provided. The four terminal portions 21 to 24 are attached at one end side to the three independent contact portions 12a to 12c and the one common contact portion 12d, respectively. It is preferable that the three independent contact portions 12a to 12c and the one common contact portion 12d are arranged almost equally on the inner side of the notch portion 31 so as to be welded to the terminal portions 21 to 24 at a position in the notch portion 31. . However, as will be described in detail later, since one independent contact portion 12b is provided outside the cutout portion 31 (upper side in the figure), the terminal portion 22 is indirectly welded at the position of the cutout portion 31. Will be.

  The distances L1 to L3 between the terminal portions 21 to 24 are spaces in the direction along the one side portion 16a between the adjacent terminal portions 21 to 24. The terminal portions 21 and 24 located on both sides of the cutout portion 31 are provided with a predetermined interval with respect to the insertion leg portion 19. The distances L1 to L3 between the terminal parts 21 to 24 and the distances between the terminal parts 21 and 24 and the insertion leg part 19 are at least as large as required for welding work with a welding jig. These intervals L1 to L3 may be equal to each other or may be unequal.

  Then, at least one of the terminal portions 21 to 24 is connected to the independent contact portions 12a to 12c and the common contact portion 12d of the planar resistor 12 via a thermal fuse 34 and a spring plate 35 as shown in FIG. (Indirectly) to be mounted.

  The thermal fuse 34 and the spring plate 35 are attached to, for example, one of the three independent contact portions 12a to 12c (for example, the middle independent contact portion 12b).

  The thermal fuse 34 is for interrupting the circuit when abnormal heat is generated. The thermal fuse 34 is composed of solder that is melted at a required temperature.

  In the spring plate 35, the solder lump 34a (see FIG. 10) in which the thermal fuse 34 is melted is between the terminal portions 21 to 24 (in particular, between the terminal portion 21 and the terminal portion 22 or between the terminal portion 22 and the terminal portion 23. In order to prevent the solder lump 34a from flipping away so as not to enter (between), a leaf spring having electrical conductivity). The solder lump 34a is approximately 2 mm to 3 mm in diameter.

  The spring plate 35 is formed in a strip shape extending in the vertical direction in the drawing so as to connect the independent contact portion 12b and the terminal portion 22. The spring plate 35 includes a spring portion 35a capable of accumulating elastic force and an arm portion 35b for flipping off the solder lump 34a by the elastic force accumulated in the spring portion 35a. The spring part 35a has a substantially semicircular shape when viewed from the side and is located on the terminal part 21 to 24 side, and the arm part 35b is located on the independent contact part 12a to 12c side.

  Then, the laminated body 15 is formed with the tip of the arm part 35b attached to the independent contact part 12b via the thermal fuse 34, and after attaching the laminated body 15 to the attachment member 17, the spring part of the spring plate 35 is formed. The end portion on the 35a side is welded to the terminal portions 21 to 24 together with the other independent contact portions 12a and 12c and the common contact portion 12d at the position in the notch portion 31. At this time, the spring plate 35 is welded and fixed in a bent state so that an elastic force is accumulated in the spring plate 35.

  At this time, in order to fly away the solder lump 34a further, it is advantageous to lengthen the arm portion 35b of the spring plate 35 and to accumulate a large amount of elastic force in the spring portion 35a. Therefore, by arranging the independent contact portion 12b of the central resistor portion 12B having the highest calorific value at substantially the center (in the vertical and horizontal directions in the figure) of the planar resistor 12, the arm portion 35b of the spring plate 35 is sufficiently provided. So that it can be long.

  Further, by making the arm portion 35b longer, a large amount of elastic force can be accumulated using the spring portion 35a and the arm portion 35b. At the position of the independent contact portion 12b which is substantially the center of the planar resistor 12, an opening 36 for passing the temperature fuse 34 and the tip of the arm portion 35b is provided in the insulating plate 13A and the heat radiating plate 14A.

  (2) As shown in FIG. 10, a partition portion 61 that partitions between the terminal portions 21 to 24 may be provided on the mounting surface 17 a of the mounting member 17.

  Here, although the partition part 61 may be provided between all the terminal parts 21-24, in this Example, from the structure (FIG. 6) of resistance part 12A-12C of the planar resistor 12, and the structure of a circuit. If provided at least between the terminal portion 21 and the terminal portion 22 and between the terminal portion 22 and the terminal portion 23, it is sufficient to prevent a short circuit between the terminal portions 21 to 24. However, when the configuration of the planar resistor 12 or the circuit is different from the above, it may be necessary to provide the partition portion 61 at a position different from the above.

  (3) The partition portion 61 may be a protective rib 62 erected from the mounting surface 17 a of the mounting member 17.

  Here, the protective rib 62 is a rib for preventing a short circuit between the terminal portions 21 to 24 and is formed integrally with the mounting member 17. The protective rib 62 is erected substantially perpendicular to the mounting surface 17a. Further, the protective rib 62 has a portion that extends mainly in the thickness direction of the stacked body 15 and is positioned at substantially the middle portion of the adjacent second mounting hole 17g in order to partition the terminal portions 21 to 24. Is preferred.

  (4) The protective rib 62 has a width dimension 66 capable of forming a first gap 65 smaller than the solder lump 34 a formed by fusing the thermal fuse 34 between the terminal portions 21 to 24. Also good.

  Here, since the solder lump 34a is approximately 2 mm to 3 mm in diameter as described above, the width 66 of the protective rib 62 is such that the first gap 65 is approximately smaller than 2 mm to 3 mm in diameter. (First gap 65 <diameter of solder lump 34a).

  (5) The protective rib 62 may have a height dimension 68 between which the second gap 67 smaller than the solder lump 34 a formed by fusing the thermal fuse 34 may be formed between the protective rib 62 and the notch 31. good.

  Here, the height dimension 68 of the protective rib 62 is set so that the second gap 67 is generally smaller than 2 mm to 3 mm (second gap 67 <the diameter of the solder lump 34a). As will be described later, when the extension 41 is provided at a position inside the notch 31 of the insulating plates 13A and 13B, the second gap 67 is connected to the top of the protective rib 62 and the extension 41 (of the It can be set as the clearance gap between a lower end part).

  (6) As shown in FIG. 7, the one side portion 16a of the insulating plates 13A and 13B extends from the notch portion 31 provided on the one side portion 16a of the heat radiating plates 14A and 14B toward the mounting surface 17a side of the mounting member 17. 41 may be included.

  Here, the one side portion 16a of the insulating plates 13A and 13B is a portion of the insulating plates 13A and 13B on the cutout portion 31 side.

  The extension 41 extends from the position of the notch 31 toward the mounting surface 17a to a length (1 / 2D) that is approximately half the notch D of the notch 31. It is preferable that the extension part 41 extends with a substantially uniform length over the entire area inside the notch part 31.

  When the extension portion 41 is provided on the one side portion 16a of the insulating plates 13A and 13B, a portion extending to the tip end position of the extension portion 41 of the insulating plates 13A and 13B is also provided on the one side portion 16a of the planar resistor 12. The portion extending to the tip position of the extension portion 41 of the planar resistor 12 may be an extension portion similar to the extension portion 41, or only the independent contact portions 12a to 12c and the common contact portion 12d may be partially extended. May be.

  (7) The extension part 41 of the insulating plates 13A and 13B may have a cut part 51 that can prevent interference with the terminal parts 21 to 24 at the attachment positions of the terminal parts 21 to 24.

  Here, the notch part 51 is provided in the part which interferes with the one end side of the terminal parts 21-24. The cut portion 51 has one end side of the terminal portions 21 to 24 along the outline of the one end side portion of the terminal portions 21 to 24 so as to have a minimum size that does not hang on one end side of the terminal portions 21 to 24. It is preferable to form so as to be substantially the same shape as the above, and the same size or slightly larger than that.

  The mounting surface 17a is provided with a sealing material 71 for sealing the first mounting hole 17f and the second mounting hole 17g.

  <Operation> The operation of this embodiment will be described below.

  In the air conditioner 1 provided in a vehicle such as an automobile, the blower 3 drives the blower motor 5 and rotates the blower fan 4 to suck the air-conditioning air 2 from the suction portion 7 and discharge it to the discharge port 9. It is like that.

  At this time, the outside air intake mode and the inside air circulation mode are switched by switching the outside air inlet 7a and the inside air circulation port 7b by the mode switching door 8 provided in the suction portion 7.

  The rotational speeds of the blower motor 5 and the blower fan 4 are switched by a blower speed control resistor 11. The blower speed control resistor 11 is an air conditioner in which a laminated body 15 including a planar resistor 12, insulating plates 13 </ b> A and 13 </ b> B, and heat radiating plates 14 </ b> A and 14 </ b> B is disposed inside the discharge port 9. Heat is released and cooled by the working air 2.

  The blower speed control resistor 11 inserts the integrated laminate 15 (the insertion leg portion 19) into the attachment member 17 (the first attachment hole 17f) to which the terminal portions 21 to 24 are attached. One end of the terminal portions 21 to 24 is connected to the independent contact portions 12a to 12c and the common contact portion 12d of the planar resistor 12 directly inside the notch 31 or via the thermal fuse 34 and the spring plate 35. Manufactured by indirectly welding.

  And by providing the temperature fuse 34 in the middle of the circuit for supplying power to the blower speed control resistor 11 and the blower motor 5, the circuit can be shut off during abnormal heat generation, and the peripheral parts are damaged by the heat of abnormal heat generation. Can be prevented. Abnormal heat generation can occur, for example, when the blower motor 5 is locked (for example, when the rotation shaft is stuck and cannot rotate). The solder lump 34a of the temperature fuse 34 melted by the abnormal heat generation is blown away by the arm portion 35b of the spring plate 35.

  <Effect> According to this embodiment, the following effects can be obtained.

  (Effect 1) The notch part 31 extended linearly along the attachment surface 17a of the attachment member 17 was provided in the one side part 16a of the heat sink 14A, 14B. Thereby, since the one side part 16a of heat sink 14A, 14B becomes a simple shape without a fine uneven part etc., heat sink 14A, 14B can be made easy to manufacture. And the notch part 31 extended in linear form can install easily the multiple terminal parts 21-24 extended toward the attachment member 17 from the planar resistor 12 inside it.

  Further, at least one terminal portion 21 to 24 was attached to the planar resistor 12 via the thermal fuse 34 and the spring plate 35. Thereby, the blower speed control resistor 11 can shut off the circuit and stop the drive of the blower motor 5 when the temperature fuse 34 is blown by the temperature rise of the planar resistor 12 at the time of abnormal heat generation or the like. it can. Accordingly, the blower speed control resistor 11 can have a circuit protection function.

  As described above, the temperature fuse 34 provided together with the spring plate 35 in at least one of the terminal portions 21 to 24 is melted by the temperature rise of the planar resistor 12, and the melted solder lump 34a (by the arm portion 35b). Even if it jumps (enters) between the adjacent terminal portions 21 to 24 (without being blown off well), the notch 31 has a simple shape along the mounting surface 17a of the mounting member 17. Therefore, since there is no portion where the melted solder lump 34a is sandwiched and retained in the cutout portion 31, a short circuit between the terminal portions 21 to 24 can hardly occur. As a result, the shape of the heat sinks 14A and 14B can be optimized.

  (Effect 2) By providing the partition part 61 which partitions between the terminal parts 21-24 in the attachment surface 17a of the attachment member 17, as mentioned above, the temperature fuse 34 provided in the at least one terminal part 21-24. Even when the melted solder lump 34a falls on the mounting surface 17a toward the inside of the notch 31, the partition portion 61 provided on the mounting surface 17a has a terminal portion. Since the solder lump 34a melted between the adjacent terminal portions 21 to 24 cannot enter between the adjacent terminal portions 21 to 24, the short circuit between the terminal portions 21 to 24 can be prevented. .

  (Effect 3) The partition part 61 is good also as the protection rib 62 standingly arranged from the attachment surface 17a of the attachment member 17. FIG. Thus, the terminal portions 21 to 24 can be reliably partitioned by the protective rib 62. Further, by providing the protective rib 62 on the mounting surface 17a of the mounting member 17, the partition 61 can be easily provided, and the partition 61 can be provided so as not to impair the function of the notch 31 of the heat sinks 14A and 14B. Can be provided.

  (Effect 4) The protective rib 62 has a width dimension 66 that can form a first gap 65 smaller than the solder lump 34a formed by fusing the thermal fuse 34 between the terminal portions 21 to 24. May be. Accordingly, the protective rib 62 can reliably prevent the solder lump 34a from being caught in the first gap 65 between the terminal portions 21 to 24.

  (Effect 5) The protective rib 62 has a height dimension 68 between which the second gap 67 smaller than the solder lump 34 a formed by fusing the thermal fuse 34 can be formed. Also good. Thus, the protective rib 62 can reliably prevent the solder lump 34a from being caught in the second gap 67 between the protective rib 62 and the cutout portion 31.

  (Effect 6) You may provide the extension part 41 extended longer than the notch 31 of heat sink 14A, 14B in the one side part 16a of insulating board 13A, 13B. Thereby, as described above, the thermal fuse 34 provided in the terminal portions 21 to 24 is blown, and the melted solder lump 34 a is adjacent to the inside of the notch portion 31 and the terminal portions 21 to 24 and the terminal portion 21. Even when trying to enter between 24 and 24, the extension 41 provided on the insulating plates 13A and 13B serves as a guard to prevent the molten solder mass 34a from entering (between the terminal portions 21 to 24). Thereby, it is difficult to cause a short circuit between the terminal portions 21 to 24. Thereby, optimization of the shape of insulating board 13A, 13B can be aimed at.

  (Effect 7) You may provide the notch part 51 of the magnitude | size which can prevent interference with the terminal parts 21-24 in the attachment position of the terminal parts 21-24 of the extension part 41 of insulating board 13A, 13B. Further, since there is no part that obstructs the attachment of the terminal portions 21 to 24 to the planar resistor 12 from the extension 41 of the insulating plates 13A and 13B, the terminal portions 21 to 24 are welded and fixed to the planar resistor 12 without any trouble. can do. At this time, the extension portion 41 was melted even if the cut portion 51 existed by making the cut portion 51 locally having a (minimum) size necessary for welding the terminal portions 21 to 24. Since the guard function for preventing the entry of the solder lump 34a can be maintained, a short circuit between the terminal portions 21 to 24 can hardly occur. Thereby, the further optimization of the shape of insulating board 13A, 13B can be aimed at.

DESCRIPTION OF SYMBOLS 11 Resistor for blower speed control 12 Planar resistor 13A Insulating plate 13B Insulating plate 14A Heat sink 14B Heat sink 15 Laminated body 16a One side part 17 Mounting member 17a Mounting surface 21 Terminal part 22 Terminal part 23 Terminal part 24 Terminal part 31 Notch part 35 Spring plate 34 Thermal fuse 34a Lump of solder 61 Partition 62 Protection rib 65 First gap 66 Width 67 Second gap 68 Height L1-L3 spacing

Claims (5)

A laminated body is formed by sandwiching both surfaces of a planar resistor with a pair of heat sinks via a pair of insulating plates, and the laminated body is mounted in a standing state on the mounting surface of the mounting member at one side. In the blower speed control resistor, the one side portion of the planar resistor is provided with a terminal portion extending from the planar resistor toward the mounting member.
The one side portion of the heat radiating plate is provided with a notch extending linearly along the mounting surface of the mounting member,
A plurality of the terminal portions are installed at intervals inside the notch portion,
The blower speed control resistor, wherein at least one of the terminal portions is attached to the planar resistor via a thermal fuse and a spring plate. The blower speed control resistor according to claim 1,
A blower speed control resistor, wherein a partition portion for partitioning the terminal portions is provided on the mounting surface of the mounting member. The blower speed control resistor according to claim 2,
The blower speed control resistor, wherein the partition portion is a protective rib erected from the mounting surface of the mounting member. The blower speed control resistor according to claim 3,
The fan speed, wherein the protective rib has a width dimension capable of forming a first gap smaller than a lump of solder formed by fusing the thermal fuse between the terminal portion and the terminal portion. Resistor for control. The blower speed control resistor according to claim 3 or 4,
The blower characterized in that the protective rib has a height dimension capable of forming a second gap smaller than a lump of solder formed by fusing the thermal fuse with the notch. Speed control resistor.