JPH0751779Y2 - Trance - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an improvement of a transformer, and more particularly to an improvement of a structure for sandwiching an iron core.

<Prior Art> In a conventional transformer, the terminal block was very bulky. As can be seen from the conventional transformer shown in FIG. 4, the terminal block (1) is fixed to the upper end portion (4) of the cover (3) which is fixed by sandwiching the iron core (2). (4)
This is because it occupies most of the bulk, and its bulk is considerably larger than that of the transformer body (5). The structure of the terminal block (4) was such that a plurality of terminals (6) were screwed to a plate-shaped table, and an insulating cover (7) such as acrylic was covered on the terminals and screwed. Therefore, when changing the connection of the terminals, it was necessary to sequentially turn the screw to attach and detach the screw. In order to eliminate the bulkiness of the transformer terminal block shown in FIG. 4 and the troublesome terminal connection, a transformer as shown in FIG. 5 was also found. This is because the terminal block (1) is formed into a substantially rectangular parallelepiped box body, and is placed along the upper end (4) of the transformer cover (3) so that its longest side is parallel to the upper end (4). It was attached. This box terminal block (1) '
The terminals (6) 'inside are separated by insulating walls (7) ", so that it is not necessary to take a great sense of the terminals (6) as in the terminal block (1) of FIG. The insulating cover (7) 'was also formed in a plate shape so as to cover the upper surface of the rectangular parallelepiped terminal block (1)' and fitted into the terminal block (1) '. At this time, a gap (8) is provided between the insulating cover (7) 'and the terminal block (1)', and an external terminal is inserted from here to connect with the terminal on the transformer side. The transformer shown in Fig. 5 is kept less bulky than the transformer shown in Fig. 4 due to the above-described structure. The stand (1) 'is standardized and the number of terminals (6)' provided is also fixed. The size of the main body was also decided.For example, if 7 terminals are provided on the terminal block uniformly according to the convenience of production, and when only 3 terminals are used at the time of use 4 terminals are left, so the terminal block has an unnecessary part with 4 extra terminals.The terminal block of this box has the maximum number of connection terminals. The upper end (4) of the transformer has a full width so that a large number can be provided.
For this reason, the conventional one shown in FIG. 4 is also the same, but when fixing it to the outside by screwing the screw through the hole (10) provided in the lower end portion (9) of the cover (3),
The terminal blocks (1) (1) 'are in the way. Therefore, if the screw passed through the hole (10) is to be turned by a screwdriver, the screwdriver must be applied to the screw head obliquely while avoiding the terminal blocks (1) (1) '. In this state, it was very difficult to tighten the screw, and even with recent electric screwdrivers, the tip of the screwdriver was idle and I could not tighten the screw well. Therefore, a proposal for a transformer as disclosed in Japanese Utility Model Publication No. 61-146927 (by the same applicant as the present application) was made. This is to install a rail on a cover that sandwiches the iron core of the transformer from both sides, and movably engage a terminal block that is separately formed in a room where the terminals of the terminal block are installed as one set. It will be.

<Problems to be solved by the invention> However, the actual development proposed by the above background is 61-1469.
No. 27, but as shown in FIG. 3, for fixing the iron core (2) (here, it also serves to fix the rail (1) ″ for fixing the terminal block (1)) nut ( 11) (11) is installed, so in addition to the inconvenience of tightening the screw in the hole (10), use a screwdriver to tighten the screw (not shown) fitted in the hole (10). When doing this, there was a danger that the screwdriver would come into contact with the nuts (11) (11) and loosen the nuts (11) (11).

The hole (10) is for tightening a screw when fixing the transformer body to another.

Therefore, when mounting the transformer body, there is a fear that the iron core clamping means may be loosened.

Here, it is also conceivable to use a cap nut as disclosed in Japanese Utility Model Publication No. 46-5710 in place of the nuts (11) and (11). This has a flat head and is hollow, but the cylindrical body that is the threaded portion does not penetrate to the head surface side (the through hole disclosed here does not communicate with the cylindrical body. Absent).

Therefore, when such a cap nut is used, when the thickness of the stacked iron cores is thin and the tip of the male screw is left, the tip of the male screw hits the back surface of the head that becomes the bag, and the iron core cannot be tightened.

On the other hand, in particular, a transformer as seen in Japanese Utility Model No. 61-146927, that is, having a rail between screws that sandwich an iron core from both sides,
In a transformer in which a terminal block is movably engaged with the rail, there is a problem of the extension of the screw due to the influence of heat generated by the transformer.

In such a transformer, there is no problem as long as the coefficient of thermal expansion in the longitudinal direction of the screw is smaller than the coefficient of thermal expansion in the thickness direction of the iron core. If it is larger than the expansion coefficient in the direction, the tightening of the screw becomes loose, and not only the iron core but also the rail becomes loose.

By loosening the screws that sandwich the iron core in this way, the terminal block that engages with the rail is subject to external vibration, and the fixed portion of the terminal is easily subject to fatigue, and also causes the terminal to loosen. Become.

The present invention aims to solve the above problems.

<Means for Solving Problems> Therefore, according to the present invention, an appropriate number of iron cores, an appropriate coil wound around stacked iron cores, and a weighted iron core are sandwiched from both sides of the iron core. Tightening means, a through hole which is provided at a predetermined position of each iron core and which penetrates from the front surface to the back surface of the iron core and through which the tightening means passes, and a rail which is provided between screws for sandwiching the iron core from both sides, In the transformer provided with the terminal block movably engaged with the rail, the tightening means is inserted into the through hole of the iron core by projecting from the male screw, the flat disk-shaped reverse hook and the reverse hook. A screw provided with an insertion portion, the screw having a threaded portion penetrating from the tip of the insertion portion to the outer surface of the inverted hook and having a threaded inner peripheral surface, The male screw is screwed in the core, and the seat surface of the male screw head and the reverse hook of the screw are engaged. Is for sandwiching the iron core from the outside, and when the sandwiching is performed by the tightening means in this way, the inside of the through hole of the iron core has an inner peripheral surface of the through hole and an outer peripheral surface of the body portion of the male screw. An object of the present invention is to provide a transformer having a hollow portion surrounded by the tip end of the screw and the seat surface of the male screw head.

<Operation> In the transformer of the present invention having the above means, the tightening means can sufficiently tighten the iron core even when the iron core is thin.

Further, when such a thin iron core is sandwiched, only the tip of the male screw protrudes to the outside, and the screwing of the male screw and the screw, that is, the tightening of the iron core of the tightening means is performed by the contact with the driver. The loosening member is not exposed to the outside of the iron core.

Furthermore, the inside of the through hole of the iron core has a hollow portion surrounded by the inner peripheral surface of the through hole, the outer peripheral surface of the male screw, the tip of the insertion portion of the screw, and the seat surface of the male screw head. Because there is
This hollow portion serves as a portion that blocks the transfer of heat between the male screw and the iron core, and it is possible to minimize expansion due to heat generation of the transformer of the tightening means.

Therefore, the rail holding the terminal block does not rattle,
It is possible to stably support the terminal block.

<Embodiment> A preferred embodiment of the present invention will be illustratively described in detail below with reference to the drawings. However, the dimensions, shapes, materials, relative positions, etc. of the components described in this embodiment are not intended to limit the scope of the present invention to them unless otherwise specified. , It is just an example of explanation.

FIG. 1 shows an embodiment of the present invention.

Iron core (2) of the transformer body (described as an assembly)
Is a terminal block (1
8) A fixing plate (18) '(18)' is provided. (19) is a terminal. The iron core (12) is provided with angled bodies (13) (13) on both lower surfaces. This angle-shaped body (13)
(13) is provided with a screw fastening hole (14) for fixing the transformer body to another. The fixed plate (18) '(18)'
The angled bodies (13, 13) are respectively penetrated by male screws (16), (16), (16), (16) which penetrate and sandwich the iron core (12), and sandwiched together with the iron core (12). On the other hand, this male screw (16)
The length is such that the tip fits inside the iron core (12), and a screw (17) is screwed onto the tip. This screw (17) has an iron core (1
2) The cylindrical part (17) 'which is inserted into the inside of the cylindrical part (1)
7) ′ is provided with an inverted barb (17) ″ that forms a seating surface at an appropriate position on the outer circumference of one end of the tubular part (1).
7) ′ is formed as a flange-like member projecting around the end face, but the present invention is not limited to this, and any member that forms a seat surface as an inverted hook may be used.

A screw groove for receiving and screwing the male screw (16) is threaded in the cylindrical portion (17) 'of the screw (17). The male screw (16) is screwed into the screw (17) in the male screw (16) receiving hole (20), and the iron core and the fixing plate (18) '(18)' or the angled body (1).
3) Hold (13).

FIG. 2 shows a screwed state of the male screw (16) and the screw (17).
In the screw (17), the aforementioned receiving hole (20) extends in the longitudinal direction, and the vicinity of the tip of the male screw (16) is received therein. The receiving hole (20) penetrates from one end of the tubular portion (17) 'to the reverse hook (17) "side.

As shown in FIG. 6, the inside of the through hole (99) of the iron core is
The inner peripheral surface (100) of the through hole (99), the outer peripheral surface (160) of the body portion of the male screw (16), and the insertion portion (17) 'of the screw (17).
It has a hollow portion (200) surrounded by the tip (170) and the head seat surface (161) of the male screw (16).

<Effects of the Invention> By implementing the present invention, the tightening means for sandwiching the iron core can be used even when the thickness of the iron core is thin. Does not expose the structure that loosens the tightening of the iron core due to contact with the driver.

Further, it is possible to suppress expansion of the tightening means against heat generation of the transformer as much as possible.

Therefore, the expansion of physical external force and heat does not cause rattling of the rails fixed together by the sandwiching of the iron core, and the terminals of the terminal block are not adversely affected by vibration.

[Brief description of drawings]

FIG. 1 is an overall perspective view showing an embodiment of the present invention, and FIG. 2 is an explanatory view of a main part thereof. FIG. 3 is a plan view showing a conventional example, and FIGS. 4 and 5 are overall perspective views showing still another conventional example. FIG. 6 is a schematic plan view of the transformer shown in FIG. 1 of the present invention. (12) ... Iron core, (16) ... Male screw, (17) ... Screw, (1
7) ′… Inverse hook, (17) ″… Cylindrical part.

Claims (1)

[Scope of utility model registration request] 1. An appropriate number of iron cores, an appropriate coil wound around stacked iron cores, tightening means for sandwiching the overlapped iron cores from the front and back sides of the iron cores, and predetermined positions of each iron core. A through hole penetrating from the front surface to the back surface of the iron core and passing through the tightening means, a rail provided between screws for sandwiching the iron core from both sides, and movably engaged with the rail. In the transformer having a terminal block, the tightening means has a male screw, a flat disk-shaped reverse hook, and a screw having an insertion portion that projects from the reverse hook and is inserted into the through hole of the iron core. The screw has a threaded portion that penetrates from the tip of the insertion portion to the outer surface of the inverted hook and has a threaded inner peripheral surface, and is screwed with the male screw in the iron core. The seat surface of the male screw head and the inverted hook of the screw hold the iron core from the outside. When the clamping means is thus sandwiched, the inside of the through hole of the iron core has an inner peripheral surface of the through hole, an outer peripheral surface of the body portion of the male screw, the tip of the insertion portion of the screw, and the male screw head. A transformer having a hollow portion surrounded by a seat surface