JPH0935956A - Electromagnetic device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromagnetic device, in which an abnormal temperature-rise protective device can be installed to a coil exposed section having a small space, the number of parts and working processes can be inhibited extremely and insulation with a shell can be ensured and adhesive properties with a coil improved without changing the part shapes of the electromagnetic device. SOLUTION: This device has an electromagnetic device body 1 with a coil exposed section 7, an abnormal temperature-rise protective device 2 brought into contact with the surface of the coil exposed section 7, an insulating molded cover 4 abutted against the abnormal temperature-rise protective device 2 and a coil cover 3 being mounted on the electromagnetic device body 1, holding down and fixing the insulating molded cover 4 so as to push the abnormal temperature-rise protective device 2 against the coil exposed section 7 and being made of a metal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic device applied to a discharge lamp ballast equipped with an abnormal temperature rise protection device.

[0002]

2. Description of the Related Art When an abnormal temperature rise protection device such as a thermal fuse is installed in a coil, the adhesion between the abnormal temperature rise protection device body and the coil is important in order to improve the accuracy of the detected temperature. However, since the body and the lead wire of the abnormal temperature rise protection device are charging parts, it is necessary to secure insulation from the outer shell. For this reason, in the prior art, in order to secure the insulation of the abnormal temperature rise protection device, an insulation treatment is performed in advance and the coil is installed on the surface of the coil.

A conventional example is shown in FIGS. That is, FIG. 26 shows an abnormal temperature rise protection device 110 in which insulation is secured by covering the thermal fuse 100 with insulating tape or insulating paper 101, 102. 103
Is a lead wire. FIG. 27 shows an abnormal temperature rise protection device 111 in which insulation is secured by covering the thermal fuse 100 with an insulating tube 104.

In either case, the thermal fuse 100 and the lead wire 103 in the vicinity thereof are secured by insulating paper 101 or the like, and the end portion of the lead wire 103 is connected to the coil terminal or the like. As shown, iron core 10
5 and an abnormal temperature rise protection device 110, 111 on the surface of the coil exposed portion 106a of the electromagnetic device including the coil 106.
Was installed using the tape 107.

[0005]

However, in order to secure the insulation of the abnormal temperature rise protection devices 110 and 111 such as temperature fuses, the insulating material must be pre-processed, resulting in an increase in the number of parts and processing steps. It was Further, the insulating paper 101 or the like deteriorates the adhesion to the coil 106, and the accuracy of the detected temperature deteriorates.

Further, the abnormal temperature rise protection devices 110 and 111 whose insulation is ensured have a large shape, and in the hook cant type electromagnetic device as shown in FIG.
Since a metal coil cover is provided for the purpose of protecting the exposed coil portion with a small amount of "a", the space for accommodating the abnormal temperature rise protection device is extremely small, making installation impossible or processing new parts. It is necessary to expand the shape. Even if it could be installed, it would be necessary to insulate and protect the coil terminal part to which the abnormal temperature rise protection device is connected, which would increase the size.

Further, since the tape 107 is attached to the surface of the coil 106, the adhesiveness of the tape 107 is deteriorated due to the temperature rise of the coil 106, and the coil 1 is peeled off or the like.
The adhesiveness with 06 deteriorates and the accuracy of the detected temperature deteriorates. Therefore, an object of the present invention is to install an abnormal temperature rise protection device on a coil exposed portion in a small space, to minimize the number of parts and processing steps, and to prevent the occurrence of an outer shell without changing the parts shape of the electromagnetic device. An object of the present invention is to provide an electromagnetic device capable of ensuring insulation and improving adhesion to a coil.

[0008]

An electromagnetic device according to claim 1 comprises:
An electromagnetic device body having a coil exposed portion, an abnormal temperature rise protection device in contact with the surface of the coil exposed portion, an insulating molded cover abutting against the abnormal temperature rise protection device, and the abnormal condition attached to the electromagnetic device body. And a coil cover made of metal for pressing and fixing the insulating molded cover so as to press the temperature rise protection device against the coil exposed portion.

According to the electromagnetic device of the first aspect, by mounting the coil cover on the main body of the electromagnetic device, the abnormal temperature rise protection device is pressed against the exposed portion of the coil by the insulating molded cover. It can be attached to the exposed part of the coil, pre-processing for insulation to the abnormal temperature rise protection device is not required, and the abnormal temperature rise protection device can be brought into contact with the coil surface at the same time, improving the assembly workability. The number of points and processing steps can be suppressed as much as possible. Moreover, since the insulation can be secured without changing the shape of the electromagnetic device parts and the adhesion between the abnormal temperature rise protection device and the coil can be improved, it is possible to reduce variations in operating temperature and improve detection accuracy.

According to a second aspect of the present invention, there is provided the electromagnetic device according to the first aspect, wherein the electromagnetic device main body has an abnormal temperature rise protection device terminal for connecting the abnormal temperature rise protection device inside the insulating molded cover. The insulating molded cover has a hollow portion for accommodating the terminal for the abnormal temperature rise protection device, which projects to the outside. According to the electromagnetic device of the second aspect, in addition to the effect of the first aspect, it is possible to prevent external contact with the abnormal temperature rise protection device terminal and prevent electric shock.

According to a third aspect of the present invention, there is provided an electromagnetic device according to the second aspect, wherein the main body of the electromagnetic device includes a core core, a first coil bobbin with a power supply terminal located at one end of the core core, and the first coil bobbin. A second terminal having the same shape as that of the abnormal core temperature rise protection device located at the other end of the core
Of the coil bobbin, the coil wound around the first coil bobbin and the second coil bobbin with the middle iron core in between, and the outer iron core arranged on the outer circumference of the coil and magnetically coupled to both ends of the middle iron core. I have.

According to the electromagnetic device of claim 3, in addition to the effect of claim 2, the metal coil cover and the coil bobbin on the power source side can be used as they are for the coil bobbin in which the abnormal temperature rise protection device is installed, and the abnormal temperature rise protection is provided. It is possible to prevent an increase in parts for mounting the device. An electromagnetic device according to a fourth aspect is the electromagnetic device according to the third aspect, wherein the second coil bobbin has a substantially U shape having flanges at both ends thereof, and the insulating molded cover has a substantially box shape that fits into the flange. A projection is provided on one of the outer surface and the inner surface of the insulating molded cover, and a groove to be fitted into the projection is provided on the other.

According to the electromagnetic device of the fourth aspect, in addition to the effect of the third aspect, the insulating molded cover can be reliably fixed, and the abnormal temperature rise protection device during installation, the coil and the coil cover can be prevented from being adversely affected. . An electromagnetic device according to claim 5 is the electromagnetic device according to claim 1, claim 2, claim 3 or claim 4,
The metal coil cover has a cutout portion that projects the hollow portion, and the insulating molded cover has a groove portion that locks an edge portion of the cutout portion.

According to the electromagnetic device of claim 5, claim 1
In addition to the effect of claim 2, claim 3 or claim 4, the insulating molded cover can be fixed more reliably.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIGS. That is, the electromagnetic device using this discharge lamp ballast as an embodiment is the electromagnetic device body 1
And an abnormal temperature rise protection device 2, a coil cover 3, and an insulating molded cover 4. The electromagnetic device body 1 has a coil exposed portion 7. This electromagnetic device body 1 has a medium iron core 35.
A first coil bobbin 6 ′ with the power supply terminal 11 located at one end of the middle iron core 35; a second coil bobbin 6 located at the other end of the middle iron core 35; Of the coil bobbin 6'and the second coil bobbin 6 and the outer iron core 36 disposed on the outer periphery of the coil 5 and magnetically coupled to both ends of the middle iron core 35 to form a ballast element. are doing. In addition, the coil bobbin 6,
6'is substantially U-shaped with flanges 6a, 6b, 6'a, 6'b at both ends. In addition, the second coil bobbin 6
An insulating tape 13 is attached to the surface of the exposed coil portion 7. The electromagnetic device body 1 is a ground plate 1
It is fixed at 0.

The abnormal temperature rise protection device 2 uses a thermal fuse as an embodiment and is in contact with the surface of the exposed coil portion 7. The insulating molded cover 4 contacts the abnormal temperature rise protection device 2. The insulating molded cover 4 has a substantially box shape that fits into the flanges 6a and 6b, and is installed so as to cover the main body of the abnormal temperature rise protection device 2 and the lead wire 2a, and the entire exposed coil portion 7. There is. Therefore, by pressing the insulating molded cover 4, the insulating molded cover 4 can press the abnormal temperature rise protection device 2 against the surface of the coil exposed portion 7.

The coil cover 3 is made of metal and is attached to the main body 1 of the electromagnetic device to fix and fix the insulating molded cover 4 so as to press the abnormal temperature rise protection device 2 against the exposed coil portion 7. The coil cover 3 is provided on the iron core 9 of the electromagnetic device body 1.
It is also caulked and fixed to the ground plate 10 by a known means. At this time, there is a portion 3a where the inner wall surface of the coil cover 3 and the corner portion of the outer wall of the insulating molded cover 4 are in contact, and when the coil cover 3 is caulked and fixed, the insulating molded cover 4
Presses the abnormal temperature rise protection device 2 so as to completely contact the surface of the coil 5.

3'is a coil cover for covering the first coil bobbin 6 ', 3'a is a cavity for accommodating the power supply terminal, and 12 is a terminal block connected to the power supply terminal 11. According to this embodiment, by attaching the coil cover 3 to the electromagnetic device main body 1, the insulating molded cover 4 presses the abnormal temperature rise protection device 2 against the coil exposed portion 7, so that the abnormal temperature rise protection device 2 can be installed in a small space. Can be attached to the exposed coil portion 7 of the coil, and preprocessing for insulation to the abnormal temperature rise protection device 2 is not required, and the abnormal temperature rise protection device 2 can be brought into contact with the coil surface at the same time, so that assembly workability is improved. It is possible to improve, and it is possible to suppress the number of parts and processing steps as much as possible. Moreover, since the insulating property can be secured without changing the shape of parts of the electromagnetic device and the adhesion between the abnormal temperature rise protection device 2 and the coil 5 can be improved, the variation in operating temperature can be reduced and the detection accuracy can be improved.

That is, it is not enough to press the abnormal temperature rise protection device 2 against the coil exposed portion 7 only with the insulating molded cover 4 because of deformation of the molded product, but with the coil cover 3 made of strong metal. It can be pressed. Further, in the hook cant type ballast element, in the discharge lamp ballast in which the coil exposed portion 7 is protected by the metal coil cover 3, it is possible to install the abnormal temperature rise protection device 2 in the limited small space. In addition, the number of parts and processing steps are suppressed as much as possible, and the insulation with the outer shell is secured and the adhesion to the coil 5 is improved without changing the parts shape of the existing ballast for discharge lamps.

A second embodiment of the present invention is shown in FIGS. That is, in the electromagnetic device according to the first embodiment, the electromagnetic device main body 1 has the abnormal temperature rise protection device terminal 16 to which the abnormal temperature rise protection device 2 is connected, inside the insulating molded cover 4, and The molded cover 4 integrally projects a cavity 15 for accommodating the terminal 16 for the abnormal temperature rise protection device to the outside. The coil cover 3 is formed with a cutout portion 17 for protruding the hollow portion 15, and the insulating molded cover 4 is pressed by the portion 3a. The tip of the lead wire 2a is wound and connected to the terminal 16 for the abnormal temperature rise protection device.

According to this embodiment, it is possible to prevent external contact with the abnormal temperature rise protection device terminal 16 and prevent electric shock. Others are the same as in the first embodiment. 10 and 11 show a modified example of the insulating molded cover 4, in which the cutouts 4a are provided at both lower ends of the insulating molded cover 4 in the second embodiment, but the cutout 4a is not provided. is there.

A third embodiment of the present invention is shown in FIGS. That is, in this electromagnetic device, in the second embodiment, the first coil bobbin 6 ′ with the power supply terminal 11 and the second coil bobbin 6 with the abnormal temperature rise protection device terminal 16 have the same shape. . According to this embodiment, the metallic coil cover 3'and the first coil bobbin 6'on the power source side are provided with the abnormal temperature rise protection device 2
Can be used as it is for the second coil bobbin 6 and the coil cover 3 for installing the same, and it is possible to prevent an increase in the number of parts for mounting the abnormal temperature rise protection device 2, and to reduce the number of new parts and processing man-hours. The increase can be eliminated.

13 and 14 show the power supply terminal 11 (11
a, 11b), terminals for abnormal temperature rise protection device (16a,
16b), showing the connection of the coil 5 and the abnormal temperature rise protection device 2, connecting the terminal 11a, which is the input side of the power supply terminal, to the terminal 16b, and connecting the terminals 16b and 16a by the abnormal temperature rise protection device 2, The coil 5 is connected between 16a and the output terminal 11b.

The winding start of the coil 5 is connected to the terminal 11b, the winding end is connected to the terminal 16a, and the terminal 16a for connecting the abnormal temperature rise protection device 2 and the coil 5 is set to the winding end. By making the coil portion near 16a on the surface of the coil 5, the potential difference between the abnormal temperature rise protection device 2 and the surface of the coil 5 can be suppressed as much as possible.

A fourth embodiment of the present invention is shown in FIGS. That is, in this electromagnetic device, in the second embodiment, the groove portion 26 is provided in the second coil bobbin 6, and the protrusion 27 that fits into the groove portion 26 in the insulating molded cover 4.
Is provided. The groove portion 26 is the second coil bobbin 6
Is formed between the pair of flanges 6a, 6b and the two ribs 25 formed along the back surface of the second coil bobbin 6.

According to this embodiment, the insulating molded cover 4 can be securely fixed, and adverse effects on the abnormal temperature rise protection device 2, the coil 5 and the coil cover 3 during installation can be prevented. That is, in the structure in which the insulating cover 4 is partially pressed by the coil cover 3 as shown in FIG. 7, the stability of the insulating cover 4 is poor and, for example, movement occurs in the direction of arrow A in FIG. It causes winding disorder due to contact with the surface of, and damages to the coil coating, degrading pressure resistance and rare performance. Further, if the abnormal temperature rise protection device 2 moves away from the surface of the coil 5, the variation in detection accuracy increases. However, if the entire outer wall surface of the insulating molded cover 4 is completely inscribed in the inner wall of the metal coil cover 3, there is no clearance between the insulating molded cover 4 and the coil cover 3, and the dimensional intersections are extremely small. Need to However, if it is a resin molded product, it is possible to realize a minute crossover, but the coil cover 3 made of metal is used.
Since the processing of (1) is squeezing, the dimensional crossing is extremely large as compared with the resin molded product, that is, the insulating molded cover 4, the coil bobbin 6, and the like. Even if the entire outer wall surface of the insulating molded cover 4 can be completely inscribed on the inner wall of the coil cover 3, the thickness of the insulating molded cover 4 may be unnecessarily increased and the cost may be increased. In this respect, in this embodiment, the coil,
Coil cover abnormal temperature rise protector is not adversely affected,
It can be installed and fixed without waste in terms of cost and processing.

Further, the rib 25 allows the coil bobbin 6,
It is possible to prevent the deflection of 6 ', secure the insulation distance between the iron core 9 and the coil 5, and position the lead wire for adjusting the gap of the ballast. Others are the same as those in the second embodiment. A fifth embodiment of the present invention is shown in FIGS. That is, this electromagnetic device is the same as the electromagnetic device according to the fourth embodiment.
The coil bobbin 6 has a protrusion 27 ′ formed by one rib, and the insulating cover 4 has two ribs 28 formed in the groove 2.
6'is formed. Others are the same as those in the fourth embodiment.

A sixth embodiment of the present invention is shown in FIGS. 22 to 26. That is, in this electromagnetic device, in the second to fifth embodiments, the metal coil cover 3 has the cutout portion 17 for protruding the hollow portion 15, but the insulating molded cover 4 has the cutout portion 17. Has a groove portion 30 for locking the edge portion of the. The groove 30 is formed between the vertical plate 32 standing on the upper surface of the cavity 15 and the outer surface 31 of the insulating molded cover 4.

According to this embodiment, the insulating molded cover can be securely fixed, and in particular, the movement of the insulating molded cover 4 in the direction B in FIG. 7 can be restricted. Others are the same as those in the first to fifth embodiments.

[0030]

According to the electromagnetic device of the first aspect, the abnormal temperature rise protection device is small in size because the abnormal temperature rise protection device is pressed against the exposed coil portion by the insulating molded cover by attaching the coil cover to the electromagnetic device body. It can be attached to the exposed part of the coil in the space, does not require pre-processing for insulation to the abnormal temperature rise protection device, and can simultaneously contact the abnormal temperature rise protection device on the coil surface, improving assembly workability. It is possible to suppress the number of parts and processing steps as much as possible. Moreover, since the insulating property can be secured without changing the shape of parts of the electromagnetic device and the adhesion between the abnormal temperature rise protection device and the coil can be improved, it is possible to reduce variations in operating temperature and improve detection accuracy. .

According to a second aspect of the present invention, in the first aspect, the main body of the electromagnetic device has an abnormal temperature rise protection device terminal to which the abnormal temperature rise protection device is connected, inside the insulating molded cover. Since the insulating molded cover has a cavity for accommodating the terminal for the abnormal temperature rise protection device protruding to the outside, in addition to the effect of claim 1, external contact with the terminal for the abnormal temperature rise protection device is prevented, Electric shock can be prevented.

According to the electromagnetic device of claim 3, in the electromagnetic device body according to claim 2, the main body of the electromagnetic device, a first coil bobbin with a power source terminal located at one end of the core, and the first coil bobbin. Second coil bobbin having the same shape as that of the coil bobbin and having an abnormal temperature rise protection device terminal located at the other end of the core core, and the first coil bobbin and the second coil bobbin with the core core in between. 3. A coil wound around the coil and an outer core arranged on the outer circumference of the coil and magnetically coupled to both ends of the middle core.
In addition to the above effect, the metal coil cover and coil bobbin on the power supply side can be used as they are for the coil bobbin in which the abnormal temperature rise protection device is installed, and an increase in the number of parts for mounting the abnormal temperature rise protection device can be prevented.

According to an electromagnetic device of a fourth aspect, in the third aspect, the second coil bobbin has a substantially U shape having flanges at both ends, and the insulating molded cover has a substantially box shape fitted to the flange. None, since the protrusion is provided on one of the outer surface of the flange and the inner surface of the insulating molded cover, and the groove portion that fits into this protruding portion is provided on the other, the insulating molded cover is securely fixed in addition to the effect of claim 3. In addition, it is possible to prevent adverse effects on the abnormal temperature rise protection device, the coil, and the coil cover during installation.

According to the electromagnetic equipment of claim 5, in claim 1, claim 2, claim 3 or claim 4, the metal coil cover has a notch for protruding the cavity, and Since the insulating molded cover has the groove portion that locks the edge portion of the cutout portion, in addition to the effect of claim 1, claim 2, claim 3, or claim 4, the insulating molded cover can be more reliably fixed.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of a first embodiment of the present invention.

FIG. 2 is a perspective view of an electromagnetic device body.

FIG. 3 is a side view thereof.

FIG. 4 is a side view with a coil cover and a ground plate attached.

FIG. 5 is a partial side view with an insulating molded cover removed.

FIG. 6 is a perspective view of an insulating molded cover.

FIG. 7 is a partial cross-sectional view of the second embodiment.

FIG. 8 is a partial perspective view showing a state in which the insulating molded cover is removed.

FIG. 9 is a perspective view of an insulating molded cover.

FIG. 10 is a perspective view of an insulating molded cover of a modified example.

FIG. 11 is a cross-sectional view seen outward from the exposed coil portion.

FIG. 12 is a side view of the third embodiment.

FIG. 13 is a plan view showing a state in which an outer core is removed.

FIG. 14 is a connection diagram showing a connection of a coil, a terminal, and an abnormal temperature rise protection device.

FIG. 15 is a side view with a ground plate and the like attached.

FIG. 16 is a perspective view of a coil bobbin according to a fourth embodiment.

FIG. 17 is a perspective view of the insulating molded cover.

FIG. 18 is a cross-sectional view seen outward from the coil exposed portion.

FIG. 19 is a perspective view of a coil bobbin according to a fifth embodiment.

FIG. 20 is a perspective view of the insulating molded cover.

FIG. 21 is a cross-sectional view seen outward from the exposed coil portion.

FIG. 22 is a perspective view of an insulating molded cover according to a sixth embodiment.

FIG. 23 is a perspective view of the coil cover.

FIG. 24 is a perspective view showing a state in which the coil cover is covered on the insulating molded cover.

FIG. 25 is a sectional view thereof.

FIG. 26 shows a conventional example, (a) is a perspective view of a state in which a thermal fuse is mounted on insulating paper, and (b) is a perspective view of a state in which the thermal fuse is sandwiched by insulating paper.

FIG. 27 is a perspective view showing a state in which another conventional thermal fuse is inserted into an insulating tube.

FIG. 28 is a perspective view showing a state in which a conventional example is attached to a coil exposed portion.

FIG. 29 is a perspective view showing a state in which another conventional example is attached to a coil exposed portion.

[Explanation of symbols]

 1 Electromagnetic device main body 2 Abnormal temperature rise protection device 2a Lead wire 3 Coil cover 4 Insulation molding cover 5 Coil 6 Second coil bobbin 6'First coil bobbin 6a, 6b Flange 7 Coil exposed part 9 Iron core 11 Power supply terminal 15 Cavity part 16 Abnormal temperature rise protection device terminal 17 Notch 26, 26 'Groove 27, 27' Projection 35 Middle core 36 Outer core

Claims (5)

[Claims] 1. An electromagnetic device body having a coil exposed portion,
An abnormal temperature rise protection device that is in contact with the surface of the coil exposed portion, an insulating molded cover that abuts against this abnormal temperature rise protection device, and the abnormal temperature rise protection device that is attached to the electromagnetic device body and is attached to the coil exposed portion. An electromagnetic device comprising: a metal coil cover that presses and fixes the insulating molded cover so as to press it. 2. The electromagnetic device main body has an abnormal temperature rise protection device terminal for connecting the abnormal temperature rise protection device inside the insulating molded cover, the insulating molded cover being for the abnormal temperature rise protective device. The electromagnetic device according to claim 1, wherein a cavity for housing the terminal is projected to the outside. 3. The main body of the electromagnetic device includes a core iron core, a first coil bobbin with a power source terminal located at one end of the core iron core, and a core coil of the same shape as the first coil bobbin. A second coil bobbin with an abnormal temperature rise protection device terminal located at the end, a coil wound around the first coil bobbin and the second coil bobbin with the middle iron core in between, and an outer circumference of the coil. The electromagnetic device according to claim 2, further comprising an outer core arranged and magnetically coupled to both ends of the middle core. 4. The second coil bobbin has a substantially U shape having flanges at both ends, the insulating molded cover has a substantially box shape that fits into the flange, and an outer surface of the flange and an inner surface of the insulating molded cover. Provide a protrusion on one side,
The electromagnetic device according to claim 3, wherein a groove portion that fits into this protrusion is provided on the other side. 5. The metal coil cover has a cutout portion that projects the hollow portion, and the insulating molded cover has a groove portion that locks an edge portion of the cutout portion. The electromagnetic device according to claim 4.