JP2808163B2 - Transformer - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a transformer in which a housing for disposing a thermal fuse or the like for interrupting a circuit when a winding is overheated is provided in a winding frame.

[Prior Art] Conventionally, through holes having both ends opened on the outer surface of a collar portion are formed in a wall constituting a winding drum portion of a transformer winding bobbin, and a thermal fuse is inserted into the through hole. It is known that they are to be contained (J. 53-36141).

According to this transformer winding bobbin, insulation is ensured by inserting a thermal fuse into the through hole to prevent contact between the thermal fuse and the winding, so insulation work can be performed or winding work can be interrupted. In this case, the thermal fuse can be easily provided without any trouble.

[Problems to be Solved by the Invention] However, in the conventional transformer as described above, since both ends of the through hole for accommodating the thermal fuse are respectively opened on the outer surface of the collar portion, the thermal fuse inserted from one side is not provided. It is easy for it to fall off or bias to the other side,
There is a difficulty in positioning the thermal fuse at a predetermined position for detecting overheating of the winding.

The present invention has been made in view of the above-described problems in the related art, and has as its object to provide a thermal fuse or the like for cutting off a circuit when a winding is overheated in a housing portion. An object of the present invention is to provide a transformer capable of easily and reliably positioning and holding a thermal fuse or the like at a predetermined position for detecting overheating of a winding when disposing the winding.

[Means for Solving the Problems] In order to achieve the above object, in the transformer of the present invention, a winding frame and a winding wound around a winding drum portion of the winding frame by being mounted on the winding frame are provided. A cover member for covering, wherein a winding means for opening a circuit at a certain temperature or higher is provided in a wall constituting a winding drum portion on which a winding whose temperature is to be detected is wound. A cavity located on the inner peripheral side of the wire is provided, and the cavity is provided with a blocking means insertion opening which opens to one side of the bobbin, and the blocking means is attached to the bobbin by attaching the cover member to the bobbin. A cover for closing the insertion opening is provided on the cover member.

[Operation] A winding is wound around a winding drum portion of a bobbin, a blocking means is inserted from a blocking means insertion opening opened on one side of the bobbin, and the blocking means is disposed in the cavity. By attaching to
The winding wound around the winding drum of the winding frame is covered, and the opening of the cutoff means of the cavity is closed by a lid provided on the cover member.

Since the cavity is provided in the wall constituting the winding body to which the winding whose temperature is to be detected is to be wound, the blocking means provided in the cavity is located inside the winding. It will be. Then, the temperature rise of the winding is detected through the material constituting the wall, and when the winding is overheated and becomes a certain temperature or higher, the circuit is opened to suppress the overheating of the winding to a certain limit or less.

Further, since the cavity has an opening for inserting the blocking means only on one side of the winding frame, unlike the case where the opening is opened on both sides of the winding frame, the blocking means is positioned at a predetermined position where the temperature of the winding is to be detected. It is advantageous above.

Since the opening for inserting the blocking means in the cavity is closed by the lid, it is possible to prevent the blocking means from largely moving or dropping from the predetermined position and failing to exhibit the intended temperature sensing function. Further, by removing the cover member, the blocking means can be easily replaced.

[Embodiment] An embodiment of the present invention will be described with reference to FIGS. 1 to 8 show a main part of a transformer according to the present invention.

10 is a transformer reel used to step down commercial AC in an adapter for converting AC to DC, 12
Are cover members to be mounted on the winding frame 10, all of which are mainly made of insulating synthetic resin.

1 to 3 show a state before the cover member 12 is mounted on the winding frame 10, in which FIG. 1 is a front view, FIG. 2 is a right side view, and FIG. 3A is a bottom view of the bobbin 10, and FIG. 3B is a bottom view of the cover member 12. FIG.

4 to 6 show a state in which the cover member 12 is mounted on the bobbin 10, wherein FIG. 4 is a front view, FIG. 5 is a right side view, and FIG. 6 is a bottom view. It is.

7 and 8 are II-II in FIG. 4, respectively.
It is a line sectional view and a III-III line sectional view.

In the winding frame 10, 14 is a first winding body for winding a primary winding, and 16 is a second winding body for winding a secondary winding, and is a first winding body. The 14 and the second winding drum 16 are provided in series. The first roll body 14 includes a front flange 18 and an intermediate flange 20.
The second body 16 is sandwiched between the intermediate flange 20 and the rear flange 22. First roll body 14 and second roll body
An annular groove 24 serving as a guide when the cover member 12 is mounted is cut inward on the outer peripheral portion of the intermediate flange portion 20 that defines the section 16.

26 is an iron core receiving hole, the front flange portion 18, the first roll body portion 14,
The bobbin 10 penetrates the bobbin 10 through the inside of the intermediate brim 20, the second bobbin 16 and the rear brim 22.

On the front upper side of the front flange 18 in the drawing, a substantially rectangular parallelepiped plug projection 30 for embedding the base of the plug blade 28 and fixing it is provided. Reference numeral 32 denotes a terminal constituting a part of the base of the plug blade 28, which protrudes above the plug projection 30.

The first winding drum portion 14 and the second winding drum portion 16 are respectively formed by a first peripheral wall member 34 and a second peripheral wall member 36 each having a rectangular tubular shape. The upper part of the first peripheral wall 34 is formed in a thick part, and a thermal fuse 38 (cutoff means) is provided in the thick part as shown in FIGS. 1, 7, and 8. A cavity 40 for disposing is provided. Thermal fuse in cavity 40
When the thermal fuse 38 is disposed, the thermal fuse 38 is located inside the primary winding wound around the first winding body portion 14 and is connected to the primary winding via the synthetic resin forming the thick portion of the first peripheral wall body 34. The overheating of the primary winding is suppressed to a certain limit or less by detecting a rise in the temperature of the wire and opening a circuit when the primary winding is overheated to a certain temperature or higher. The cavity 40 is provided in the first peripheral wall 34 because the primary winding generates a larger amount of heat than the secondary winding. The cavity 40 is provided with a thermal fuse insertion opening 42 that penetrates through the plug projection 30 and opens at the front end of the winding frame 10. Since the cavity 40 has the thermal fuse insertion port 42 opened only at the front end of the bobbin 10, it is advantageous in positioning the thermal fuse 38 at a predetermined position where the temperature of the primary winding should be detected.

A recess 44 is formed in the front surface of the plug projection 30 above the thermal fuse insertion opening 42, and the recess 44 is provided with two lead wire lead-out grooves 46. Thermal fuse
The two lead wires 48 are drawn upward through the lead wire drawing groove 46.

Reference numeral 50 denotes a guide ridge provided on the front surface of the front flange portion 18.

Reference numeral 52 denotes a terminal projection provided below the rear flange 22.

In the cover member 12, 60 and 62 are a front wall and a rear wall, each of which has a substantially U-shaped flat plate shape, and 64 is an outer peripheral wall bent into a substantially U-shape. Connected.

Reference numeral 66 denotes a lid for closing the thermal fuse insertion port 42. The lid 66 projects upward from the base 68, and left and right ends of the base 68 are supported by support arms 70 projecting from both upper ends of the front wall 60.

When assembling a transformer using the winding frame 10 and the cover member 12, a primary winding is wound around the first winding body 14, and a secondary winding is wound around the second winding body 16, respectively. After the thermal fuse 38 is inserted into the cavity 40 and placed in the cavity 40, the cover member 12 is mounted from below the bobbin 10 as shown by the arrows in FIGS. At this time, the cover member 12
The inner peripheral portion of the rear wall 62 is fitted into the left and right and lower sides of the annular groove 24 of the intermediate flange portion 20, the inner edge of the front wall 60 is along the guide ridge 50, and the rear surface of the front wall 60 is It should be in contact with the front of the part 18.

As a result, as shown in FIGS. 4 to 8, the cover member 12 surrounds the three sides except the upper part of the first winding drum part 14 from the outside. At the same time, the thermal fuse insertion opening 42 is closed by the lid 66. For this reason, it is possible to prevent the thermal fuse 38 from largely moving or dropping from a predetermined position and failing to exhibit the intended temperature sensing function. Further, replacement of the thermal fuse 38 can be easily performed by removing the cover member 12.

[Effects of the Invention] In the transformer of the present invention, the cavity for disposing the shut-off means for detecting the temperature rise of the winding and opening the circuit at a certain temperature or higher is provided with the winding for detecting the temperature rise. It is provided in the wall constituting the winding drum to be turned, and is located on the inner peripheral side of the winding where the temperature tends to rise, so that the temperature rise is quickly increased by the blocking means arranged in the cavity. Since it can be detected and the blocking means insertion opening is opened only on one side of the reel,
Unlike the case where the insertion openings are opened on both sides of the winding frame, the inserted blocking means does not fall off or bias to the opposite side, and the blocking means is positioned at a predetermined position where the temperature of the winding is to be detected. Above is easy and reliable.

In addition, since the blocking means insertion opening is opened only on one side of the bobbin, the fixing means is fixed by fixing the lead wire of the blocking means drawn out from the insertion ports on both sides of the bobbin as in the related art. Although it can not be done, by attaching the cover member to the winding frame, at the same time as covering the winding wound on the winding drum section, the lid closes the opening of the cavity, so that, It is possible to prevent the blocking means from exhibiting the intended temperature sensing function due to large movement or dropping.

Therefore, according to the transformer of the present invention, it is possible to extremely efficiently assemble a transformer with a cover that can reliably suppress overheating of the winding to within a certain limit.

[Brief description of the drawings]

1 to 8 relate to one embodiment of the transformer of the present invention. 1 to 3 show a state before a cover member is attached to a bobbin, in which FIG. 1 is a front view,
2 is a right side view, FIG. 3 (a) is a bottom view of the bobbin, and FIG.
FIG. 2B is a bottom view of the cover member. 4 to 6 show a state in which a cover member is mounted on a bobbin, in which FIG. 4 is a front view, and FIG.
The figure is a right side view, and FIG. 6 is a bottom view. 7 and 8 are a sectional view taken along the line II-II and a sectional view taken along the line III-III in FIG. 4, respectively. In the drawings, 10 is a bobbin, 12 is a cover member, 14 is a first bobbin,
16 is the second winding body, 34 is the first peripheral wall, 36 is the second peripheral wall, 38
Is a thermal fuse, 40 is a cavity, 42 is a thermal fuse insertion port,
66 is a lid.

Claims (1)

(57) [Claims] The present invention comprises a winding frame, and a cover member that covers the winding wound around the winding drum of the winding frame by being mounted on the winding frame. A cavity located on the inner peripheral side of the winding is provided in the wall constituting the turned winding body for arranging blocking means for opening a circuit at a certain temperature or higher, and the cavity is provided in the cavity. A shielding means insertion opening which is opened on one side of the bobbin, and a cover for closing the blocking means insertion port by mounting the cover member on the bobbin is provided on the cover member. And transformer.