JPH0611332U - Electromagnetic device - Google Patents

Abstract

(57) [Summary] [Object] An object of the present invention is to obtain an electromagnetic device in which a temperature sensor can be easily placed in contact with the coil surface and the reliability of temperature detection by this sensor can be improved. A coil bobbin 15 having flanges 17 at both ends of a winding barrel 16 and a temperature fuse 23 provided in contact with the surface of a coil 22 mounted on the bobbin 15 for detecting the surface temperature of the coil 22. To have. Then, each of the flanges 17 of the coil bobbin 15 is formed with a sensor mounting groove 18 having a narrow inlet 18a and a large depth. Further, the temperature fuse 23 is formed in a rod shape having a length extending between the both flanges 17, and both ends in the longitudinal direction of the temperature fuse 23 are elastically fitted into the sensor mounting grooves 18 through their inlets 18a. It is characterized by being installed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an electromagnetic device such as a discharge lamp ballast having a temperature sensor for detecting the surface temperature of a coil attached thereto.

[0002]

[Prior art]

 FIG. 4 shows a conventional example of a discharge lamp ballast with a temperature sensor. In the figure, reference numeral 1 denotes an iron core structure formed by combining an E-shaped iron core 2 and an I-shaped iron core 3 in the center of the E-shaped iron core 2. A coil bobbin 4 is attached to the leg 2a (see FIG. 5) by fitting it. A coil 5 formed by winding a coil wire is attached to the coil bobbin 4.

A terminal portion of the coil 5 is connected to a terminal fitting 6 attached to the coil bobbin 4. On the surface of the coil 5, a thermal fuse 7 as a temperature sensor is attached in contact with this surface. The fuse 7 is attached to the surface of the coil 5 through an adhesive tape 8 that covers the thermal fuse 7 and is adhered to the surface of the coil 5, as shown in FIG.

The temperature fuse 7 detects the surface temperature of the coil 5 and operates when the coil surface temperature reaches a set value due to an abnormality due to some cause, and shuts off the power supply circuit. By this, the discharge lamp ballast and the like are protected.

[0005]

[Problems to be solved by the device]

 In the conventional case where the thermal fuse 7 is fixed to the surface of the coil 5 with the adhesive tape 8 as described above, the thermal fuse 7 is manually positioned and taped, so that the workability of mounting the thermal fuse 7 is poor. is there. Further, not only is it difficult to accurately fix the thermal fuse 7 at a predetermined position on the coil surface due to variations in operators, but also the adhesive tape 8 based on variations in the adhesive force of the adhesive tape 8 and changes with time of the adhesive force. Due to the occurrence of peeling, it tends to be difficult to hold the thermal fuse 7 at a predetermined position for a long period of time. Therefore, there is a high possibility that the thermal fuse 7 will not operate properly when the coil 5 has an abnormal temperature rise.

An object of the present invention is to obtain an electromagnetic device in which a temperature sensor can be easily placed in contact with the coil surface and the reliability of temperature detection by this sensor can be improved.

[0007]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the electromagnetic device of the present invention is provided in contact with the surface of a coil mounted on a coil bobbin having flanges at both ends of a winding drum, and detects the surface temperature of the coil. A temperature sensor is provided, each of the flanges of the coil bobbin is formed with a sensor mounting groove having a narrow inlet and a large depth, and the temperature sensor is a rod-shaped member having a length extending between the flanges. Both ends of the sensor in the longitudinal direction are mounted by elastically fitting the respective sensor mounting grooves through their inlets.

[0008]

[Action]

 In the structure of the present invention, the sensor mounting groove formed on the flange of the coil bobbin elastically fits the end portion of the temperature sensor to position the temperature sensor at a predetermined mounting position. Further, the sensor mounting groove prevents the temperature sensor from being inadvertently detached by the elastic force of the inlet edge portion sandwiching the narrowed inlet, and holds the temperature sensor in contact with the surface of the coil. Moreover, the elastic deformation of the inlet edge enables the end of the temperature sensor to be fitted into the sensor mounting groove.

[0009]

【Example】

 Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 and 2 show the configuration of a discharge lamp ballast 11 as an electromagnetic device, respectively. Reference numeral 12 in these figures denotes an iron core structure, which is formed by combining an E-shaped iron core 13 and an I-shaped iron core 14 formed by stacking silicon steel sheets, and connecting their mating surfaces by welding. ing.

A coil bobbin 15 made of an integrally molded synthetic resin is attached to the center leg 13 a of the E-shaped iron core 13. As shown in FIG. 3, the coil bobbin 15 is bent at a right angle to the winding barrel portion 16 at both ends of a rectangular tubular winding barrel portion 16 fitted to the outside of the central leg 13a and protrudes outward. The flanges 17 are provided to form each of them.

Sensor mounting grooves 18 facing each other are formed on both flanges 17. In the case of this embodiment, the positions where these mounting grooves 18 are provided are defined at one corner of the flange 17. Each of the sensor mounting grooves 18 has a groove structure in which the inlet 18a is narrow and wide, and narrow V-shaped auxiliary slits 19 are formed on both sides of the inlet 18a. Between the auxiliary slit 19 and the inlet 18a, an elastically deformable inlet edge portion 20 is formed.

As shown in FIG. 1, one flange 17 is provided with a plurality of terminal fittings 21 protruding in a direction away from the other flange 17. A coil 22 formed by winding a coil element wire such as an enamel-coated electric wire is attached to the winding body portion 16 of the coil bobbin 15, and a terminal portion of the coil 22 is connected to a terminal fitting 21.

A temperature fuse 23 as a temperature sensor is arranged on the surface of the coil 22 in pressure contact with the surface of the coil 22, as shown in FIG. That is, the temperature fuse 23 has a round bar shape having a length extending between both flanges 17 of the coil bobbin 15, and the diameter of the fuse 23 is slightly larger than the diameter of the sensor mounting groove 18. . The thermal fuse 23 is mounted across the flanges 17 by press-fitting both ends thereof into the sensor mounting grooves 18 of the flanges 17, respectively, and the surface of the thermal fuse 23 is mounted on the coil 22. Pressed and held on the surface of. The arrow X in FIG. 2 indicates the direction in which the temperature fuse 23 is press-fitted into the sensor mounting groove 18, and the lead wires (not shown) drawn from both ends of the temperature fuse 23 are connected to the terminal fitting 21. Has become.

When assembling the discharge lamp ballast 11, the temperature fuse 23 is attached before the coil bobbin 15 having the coil 22 is fitted to the central leg 13 a of the E-shaped iron core 13 or before the coil 22 is attached. The coil bobbin 15 thus fitted is fitted to the central leg 13a of the E-shaped iron core 13 and attached, then the I-shaped iron core of the E-shaped iron core 13 is combined, and these are welded to form the iron core structure 12 and then attached. To be

When mounting the thermal fuse 23, both ends thereof are opposed to the inlets 18a of the sensor mounting grooves 18 formed in the flanges 17 of the coil bobbin 15, respectively. It is performed by pushing in the direction of the middle arrow X. Then, since the inlet edge portion 20 is easily elastically deformed while the auxiliary slit 19 disappears, the ends of the temperature fuses 23 are respectively press-fitted into the sensor mounting grooves 18 through the inlets 18a. As a result, the thermal fuse 23 is installed across both flanges 17, and its peripheral surface is attached so as to be in close contact with the surface of the coil 22.

As described above, since the fixing member such as the adhesive tape is not used for mounting the thermal fuse 23, and the mounting can be performed only by pushing it into the sensor mounting groove 18, the mounting can be easily performed. A thermal fuse 23 can be attached. Further, since the temperature fuse 23 is mounted at a position determined by the sensor mounting groove 18, the mounting position of the temperature fuse 23 does not vary, and the temperature fuse 23 can be mounted at a predetermined position.

After the mounting, the inlet edge portion 20 is returned due to its elasticity and is engaged so as to be held by the peripheral surface of the end portion of the thermal fuse 23, so that the thermal fuse is protected from vibrations or the like. There is no fear that 23 will come off accidentally. Therefore, the temperature fuse 23 is closely held at a predetermined position on the surface of the coil 22 for a long period of time, and the surface temperature of the coil 22 can be detected, so that the operation is highly reliable. When the temperature fuse 23 detects a predetermined coil surface temperature, the fuse 23 shuts off the power supply circuit to protect the discharge lamp ballast and the like.

The present invention is not limited to the above embodiment. For example, a part of the flange 17 (such as the central part) is projected longer than the other part, and the sensor mounting groove 18 is provided in that part so that the flat surface of the coil 22 is brought into contact. Alternatively, the temperature sensor 23 may be attached. Further, although the temperature sensor 23 of the above-described embodiment itself has a circuit interruption function, it has only a temperature detection function, and the power supply circuit or the like is interrupted based on the detection signal. Good. Further, an auxiliary slit for facilitating elastic deformation of the entrance edge portion 20 may be omitted.

[0019]

[Effect of device]

 As described in detail above, according to the electromagnetic device of the present invention, the end of the rod-shaped temperature sensor fits into the sensor mounting groove due to the elastic deformation at the inlet edge of the sensor mounting groove formed on the flange of the coil bobbin. Since the temperature sensor can be mounted in place, the temperature sensor can be easily mounted by positioning the temperature sensor at a predetermined position by simply pushing the end of the temperature sensor into the sensor mounting groove. Since is held in contact with the coil surface, the reliability of temperature detection by the temperature sensor can be improved.

[Brief description of drawings]

FIG. 1 is a perspective view showing a configuration of a discharge lamp ballast according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing the configuration of the discharge lamp ballast according to the embodiment, taken along line ZZ in FIG.

FIG. 3 is a perspective view showing a configuration of a coil bobbin of the discharge lamp ballast according to the embodiment.

FIG. 4 is a perspective view showing a configuration of a discharge lamp ballast according to a conventional example.

FIG. 5 is a cross-sectional view showing a configuration of a discharge lamp ballast according to the conventional example, taken along line YY in FIG.

[Explanation of symbols]

11 ... Discharge lamp ballast, 13 ... E type iron core, 14 ... I type iron core, 15 ... Coil bobbin, 16 ... Winding barrel part, 17 ... Flange, 18 ... Sensor mounting groove, 18a ... Sensor mounting groove inlet, 20 ... Inlet Edges, 22 ... Coil, 23 ... Thermal fuse (temperature sensor).

Claims (1)

[Scope of utility model registration request] 1. A coil bobbin in which flanges are provided at both ends of a winding body, a coil composed of a coil wire wound around the winding body of the bobbin, an iron core structure to which the coil bobbin is mounted, and In an electromagnetic device comprising a temperature sensor that is provided in contact with the surface of a coil and that detects the surface temperature of the coil, a sensor mounting groove having a narrow inlet and a large depth is formed in each of the flanges of the coil bobbin, and the temperature sensor is provided. Is a rod-shaped member having a length extending between the both flanges, and both ends of the temperature sensor in the longitudinal direction are elastically fitted to the sensor mounting grooves through the respective inlets and mounted. machine.