JPH06148239A - Cable clamp of current transformer - Google Patents

Abstract

PURPOSE:To obtain a cable clamp of a current transformer which allows a detecting power line to be easily built therein. CONSTITUTION:A current transformer is formed into a separate model. A spring supporting tool 6 is provided to couple and support split cores 1a, 1b from right and left sides by the spring force. Moreover, the clamp is provided with a cable clamp supporting tool 5 which has a notched part to set a power line 2 not to shift and is fitted in the core part of the current transformer in the state where the power line is set in the notched part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cable clamp of a current transformer for detecting a power line current in an outdoor unit of an air conditioner.

[0002]

2. Description of the Related Art FIG. 9 shows a conventional clamp structure of a current transformer.

A current transformer 1 is mounted on a control board 3 on which a microcomputer is mounted. The power line 2 is drawn into the current transformer 1, bent into a U shape, and bundled with a bundle wire 4.

The CT (current transformer) is used for detecting an abnormal current (load) of a converter input current of an outdoor unit of an air conditioner or an output current of an inverter.

[0005]

In the outdoor unit of the air conditioner having the conventional current transformer, there are the following problems in the assembling and wiring work of the current detecting portion. (1) One end of the power line 2 must be led into the control board 3, passed through the current transformer, and led out again to be bundled in the CT section. Therefore, the wiring work becomes complicated,
The amount of work increases. (2) If an extra force is applied to the power line 2 during work, the iron core of the CT may be pulled and the CT and the substrate 3 may be damaged.

[0006]

The present invention takes the following means in order to solve the above problems.

That is, in a current transformer which is composed of an iron core provided with a penetrating portion and a secondary winding, a power line is penetrated through the penetrating portion as a primary conducting wire, and the current of the power line is detected, the current transformer is of a split type, A state in which a spring support tool that supports the divided iron cores from both left and right sides by spring force is provided, and a notch portion that sets the power line so as not to shift is provided, and the power line is set at the notch portion. A cable clamp for a current transformer, comprising a cable clamp support fitted to the iron core of the current transformer.

[0008]

In the above means, when the power line is drawn into the current transformer incorporated in the control board of the outdoor unit of the air conditioner, for example, the midway of the power line is set in the notch of the cable clamp support. Then, the cable clamp support is fitted to one iron core of the current transformer. Then, apply the other iron core and contact the split ends of both iron cores.
Set the spring support. The spring support maintains the contact force at the split ends with the spring force.

In this way, the work of pulling the power line into the CT is extremely simple. Further, since the setting is performed via the cable clamp support, even if an inadvertent force is applied from the power line, it is absorbed here, and damage to the CT and the control board is prevented.

[0010]

Embodiments (1) A first embodiment of the present invention will be described with reference to FIGS.

In FIG. 1 and FIG. 2, the current transformer 1 is a split iron core type, and is divided into two U-shaped iron cores 1a and 1b. Each core has a square cross section. A bobbin 10 having a square cross section with a coil is inserted into the lower arm of one iron core 1b.

The cable clamp support 5 is of a channel type and its length is substantially equal to the width of the iron core after assembly. The width thereof is substantially equal to the width of the square cross section of the iron core 1b. Further, three slits a are cut in each side plate portion along the length direction. There are also notches on both sides of the bottom. This is made of plastic, rubber, etc.

Further, the spring support 6 has a gate shape in which a strip-shaped member having a width substantially equal to the angular cross section of the iron core 1b is bent at both ends thereof. The width of the lower part of the gate is almost equal to the width after the iron core is assembled. In addition, the clamp claws 6a bent inward are attached to the longitudinal edges of the lower ends of both columns. Further, the center of the beam is slack, and the clamp claw 6b is also similarly provided at the center.
Is attached.

The CT is connected to the control board 3 by a plug 12 via a lead wire.

In the above, for the work of passing the power line 2, the middle of the power line 2 is bent into an S shape and is pushed into the slit a of the cable clamp support 5 (FIG. 2). Then, push this while sliding it onto the arm above the iron core 1b. Then, the lower surface hits the upper edge of the bobbin 10 and the downward displacement is prevented.

Next, the upper arm of the iron core 1a is put into the cable clamp support 5, the lower arm is put into the square hole b of the bobbin 10 and pushed toward the iron core 1b. In this way, it can be easily assembled and the displacement after assembly is prevented.

The spring support 6 is then applied from above.
The clamp claws 6a sandwich both sides of the iron core, and the clamp claws 6b sandwich the upper side of the iron core. In this way, the left-right front-back shift is prevented. Further, it is pressed from both sides by a spring action, and the left and right iron cores 1a and 1b are kept in contact with each other.

After assembly, it becomes as shown in FIG. Further, a front view (power line omitted) after assembly is shown in FIG. 3, and a sectional view taken along line AA is shown in FIG.

Even if the iron core is divided into two parts, the function as a CT is sufficiently fulfilled, and it is sold as a product.

As described above, the power line 2 can be easily attached and its deviation can be prevented. Also, even if the power line is inadvertently pulled, the force is absorbed at the cable clamp support. For this reason, stress does not occur in the CT iron core, and damage is eliminated. Further, since the CT is separated from the control board, the mounting area of the control board is reduced. Therefore, the control board can be made smaller. Moreover, the CT can be easily converted without changing the power line harness. (2) A second embodiment of the present invention is shown in FIG. In this embodiment, the slit a of the cable clamp support is provided near one end of one side surface and near the other end of the other side surface. (3) A third embodiment of the present invention will be described with reference to FIGS. The parts described in (1) above are given the same numbers and their explanations are omitted.

In FIG. 6, the coil 11 has a narrow winding width so that the tip of the iron core 1b projects when wound around the iron core 1b. Then, the sleeve 8 having a rectangular tubular shape is provided at the tip of the iron core 1b.
Is inserted.

The cable clamp support 5a is substantially the first.
Similar to the embodiment, but one of the side plates separated by the slit a is extended toward the center. And a place extending by the width 1 of the cable clamp support 5a from the other,
At that point, each is bent inward at an acute angle. And this part becomes the lock claw c. Further, a lock claw receiver d is provided on the side plate corresponding to this. In addition, the notch at the bottom end is omitted.

The spring support 6a is substantially the same as that of the first embodiment, but the claw is omitted.

In the above, the pulling-in of the power line 2 and the setting of the cable clamp support 5a are performed in the same manner as in the first embodiment. Next, the iron core 1a is coupled via the sleeve 8. Then, the side plate having the lock claw c is bent 90 ° along a line having the same height as the other side plate, and the tip of the claw is hooked on the lock claw receiver d of the other party. After that, the spring support tool 6a is set.

A detailed front view after assembly is shown in FIG.
The B section is shown in FIG.

[0026]

As described above, according to the present invention,
The work of pulling in the power line is extremely easy and the work of wiring is simple. Further, even if the power line is inadvertently pulled, the force is absorbed by the cable clamp support, so that the iron core of the CT is not stressed and is not damaged.

[Brief description of drawings]

FIG. 1 is a perspective view of the entire configuration of a first embodiment of the present invention.

FIG. 2 is an exploded perspective view of a CT unit of the embodiment.

FIG. 3 is a detailed front view of the CT unit of the embodiment.

FIG. 4 is a sectional view taken along line AA of FIG. 3 of the same embodiment.

FIG. 5 is an exploded perspective view of a CT unit according to a second embodiment of the present invention.

FIG. 6 is an exploded perspective view of a CT unit according to a third embodiment of the present invention.

FIG. 7 is a detailed front view of the CT unit of the embodiment.

FIG. 8 is a sectional view taken along line BB in FIG. 7 of the same embodiment.

FIG. 9 is a perspective view of a conventional example.

[Explanation of symbols]

 1 Current Transformer (CT) 2 Power Line 3 Control Board 4 Bundled Wire Material 5, 5a, 5b Cable Clamp Support Tool 6, 6a Spring Support Tool 8 Sleeve

Claims (1)

[Claims] 1. A current transformer, comprising a core provided with a penetrating portion and a secondary winding, a power line passing through the penetrating portion as a primary conducting wire and detecting a current of the power line, wherein the current transformer is a split type. In addition to being equipped with spring support tools that support the divided iron cores from both left and right sides with spring force,
It has a notch for setting the power line so as not to shift, and is provided with a cable clamp support which is fitted to the iron core of the current transformer with the power line set in the notch. A current transformer cable clamp that is characterized.