JP2731130B2 - Electric compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric compressor used for a refrigerator, an air conditioner and the like, and more particularly to a structure of a lead wire connecting a sealed terminal of a container and an electric element.

[0002]

2. Description of the Related Art In a general electric compressor, three lead wires are connected between an electric element and a sealed terminal. Each lead was connected to the stator winding of the motorized element.

[0003] During operation of the electric compressor, the electric element and the compression element are constantly vibrating inside due to its structure. For this reason, the lead wire always vibrates, and when the lead wire is long, the lead wire comes into contact with the electric element or the compression element, and the lead wire may be disconnected or short-circuited. Further, when the lead wire is short, the assemblability becomes extremely poor due to the structure of the hermetic electric compressor.

[0004] Conventionally, such a problem has been solved.
There was one such as described in Japanese Patent Publication No. 0-128462. What is described in this publication is that at least one lead wire is shortened so that the lead wire faces the direction of the sealed terminal, thereby making it possible to shorten the lead wire and secure workability. Met.

[0005]

In the conventional electric compressor constructed as described above, the connection between the stator winding of the electric element and the lead wire is generally provided on the coil end of the electric element as shown in FIG. Had been provided.

In this figure, reference numeral 41 denotes a stator core of an electric element, reference numerals 42 to 45 denote stator windings, and reference numeral 47 denotes a protector for listening to a contact piece when a compressor malfunctions. The binding wires 54 and 55 are fixed on the coil ends of the windings 42 to 45.

Reference numerals 48 to 50 denote lead wires. One end has Faston terminals 51 to 5 connected to a sealed terminal.
3 are connected. The other ends of the lead wires are respectively connected to the stator winding, and this connection portion is connected to the protector 4.
7 and the coil end.

The protector 47 is connected in the middle of the drawer 50. The binding yarn 56 fixes the lead wires 48 to 50 to the coil end of the stator winding.

In such a configuration, a lead wire such as a lead wire is interposed between the stator winding and the sealed terminal. Possibility of motor insulation failure due to oligomer precipitation, increase in coil end volume because the connection between the stator winding and the lead wire is on the coil end, and failure of insulation at the connection. There was a problem that there was a point, in order to respond to this, a method of connecting the Faston terminal to the sealed terminal after caulking the Faston terminal directly to the coil of the stator winding,
In this case, when a plurality of coils or coils having different wire diameters are collectively swaged to the Faston terminal, there is a problem that a swaging force cannot be sufficiently secured.

[0010] In the case of caulking coils having different wire diameters in particular, there is a problem that if the caulking force is weak, the small diameter coil will not be sufficiently caulked, and if the caulking force is strong, the coil will be broken. .

In actual assembly of the electric compressor, if the wire diameter of the coil is large, the flexibility of the coil is insufficient, and the workability of mounting the Faston terminal to the sealed terminal is deteriorated. However, it was difficult to employ it for high-power electric compression.

Further, in such a configuration, the mechanical strength in the vicinity of the connection between the coil and the faston terminal cannot be sufficiently secured, and the reliability with respect to the vibration during the actual operation of the compressor is insufficient. Met.

[0013] In order to solve such problems, the present invention provides an electric compressor having a structure in which a lead wire (lead wire) is eliminated without lowering workability.

[0014]

SUMMARY OF THE INVENTION The present invention combines an electric element and a compression element in a single container and connects a stator winding from the electric element to a sealed terminal fixed to the container. A metal cylindrical member electrically connected to an end of a stator winding covered with an insulating tube; a connection terminal electrically connected to the cylindrical member; A heat-shrinkable insulating tube that covers the stator windings, wherein the connection terminal is connected to the sealed terminal to supply power to the electric element.

[0015]

In the electric compressor constructed as described above, the connection strength between the faston terminal and the cylindrical member is sufficiently ensured by using the metal cylindrical member, and the connection failure can be prevented.

Further, by connecting the stator winding once to the cylindrical member, the stator winding can be prevented from coming off and the conventional lead wire can be eliminated while securing the workability of assembling the electric compressor.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of the electric compressor. In this figure, reference numeral 1 denotes a hermetic electric compressor, in which an electric element 3 is accommodated in an upper part of a closed vessel 2 and a compression element 4 is accommodated in a lower part.

Reference numeral 5 denotes a rotary shaft, which connects the electric element 3 and the compression element 4 and has a through hole 5a in the axial direction. The electric element 3 includes a stator core 6 press-fitted into the closed casing 2 and a rotor 7 having an inner circumferential groove 7a.
And an end ring 8 and a balance weight 10 provided above the rotor 7 and an end ring 9 and a balance weight 11 provided below.

The compression element includes a cylinder 12 pressed into the container 2, an upper frame 15 for closing an opening of the cylinder 12,
And a lower frame 16; bearings 13 and 14 provided on the frames 15 and 16; It is constituted by a vane 18 whose front end is pressed and divides the inside of the cylinder into a high pressure side and a low pressure side.

Reference numeral 19 denotes a sealed terminal, which is a sealed container 2
It is installed while maintaining the inside airtightness. Reference numeral 20 denotes a stator winding inserted into the stator core 6, and is connected to the sealing terminal 19 via a lead-out portion 21. This stator winding 20 has a sealed terminal 19 and a drawer 2
Power is supplied from the outside of the container 2 through the power supply 1.

FIG. 2 shows one of the lead wires 21 shown in FIG.
It is the enlarged view which showed the leader line of the book. In this figure,
Reference numeral 26 denotes an end of the stator winding, which is drawn to supply power.

Reference numeral 25 denotes an insulating tube (material such as polyester film or Teflon),
And assists the insulation and protection of the stator winding 26 and the bending strength of the stator winding 26 against bending.

This insulating tube is connected to the inner stator winding 2.
6, the same effect as that of the present invention can be obtained by using a stator winding 26 that cannot be seen.

Reference numeral 23 denotes a cylindrical (or pipe-like) cylindrical member made of brass, phosphor bronze, aluminum, or a metal having conductivity similar to these metals. The cylindrical member 23 is electrically connected to an end of the stator winding 26. For example, as shown in FIG. 3, the stator winding 26 is inserted into the cylindrical member 23, the coating of the stator winding is removed, and then the cylindrical member 23 is crimped. Alternatively, solder, welding, or the like may be used.

FIGS. 4A and 4B are a side view and a front view of the cylindrical member 23, respectively. Reference numeral 22 denotes a faston terminal (connection terminal), which has a shape that fits into the sealed terminal 13.
This faston terminal is electrically connected to one end of the cylindrical member 23 as shown in FIG. For example, they are connected by crimping or the like.

Reference numeral 24 denotes a heat-shrinkable insulating tube which is fitted to a critical portion between the cylindrical member 23 and the stator winding 26, and then heat-shrinks. By using this heat-shrinkable tube, the strength at the critical portion of the stator winding 26 is reinforced by the insulating tube. Further, even when the stator winding 26 comes off the cylindrical portion 23, the stator winding can be prevented from being exposed.

[0027]

As described above, the present invention combines an electric element and a compression element integrally in a single container and connects a stator winding from the electric element to a sealed terminal fixed to the container. An electric compressor comprising: a metal cylindrical member electrically connected to an end of a stator winding covered with an insulating tube; a connection terminal electrically connected to the cylindrical member; A heat-shrinkable insulating tube that covers the stator winding, and the connection terminal is connected to the sealing terminal to supply power to the electric element. Electrical connection is reliably performed, and the connection failure due to the detachment of the stator winding can be suppressed.

Since the critical portion between the cylindrical portion and the stator winding is protected by a heat-shrinkable insulating tube, the stator winding may be broken due to vibration during assembly of the compressor or operation of the compressor. It can prevent detachment.

Moreover, since the cylindrical member is connected to the connection terminal so that a part of the cylindrical member is exposed from the connection terminal, the stator winding does not come into contact with the inner edge of the connection terminal to be disconnected. In addition, since the critical portion between the cylindrical member and the stator winding is protected by the heat-shrinkable insulating tube, it is possible to prevent the stator winding from breaking or coming off due to vibration during assembly or operation of the compressor.

[Brief description of the drawings]

FIG. 1 is a sectional view of an electric compressor.

FIG. 2 is an enlarged view showing one of the drawers shown in FIG.

FIG. 3 is a partial cross-sectional view showing a state where a cylindrical member is fitted to the stator winding shown in FIG. 2;

FIGS. 4A and 4B are a side view and a front view of the cylindrical member shown in FIG. 3;

FIG. 5 is a partial top view of a conventional electric element as viewed from above. 2 Container 3 Electric Element 4 Compression Element 22 Faston Terminal 23 Cylindrical Member 24 Heat-Shrinkable Insulating Tube 25 Insulating Tube 26 Stator Winding

Claims (1)

(57) [Claims] An electric compressor comprising an electric element and a compression element integrally combined in a single container, and a stator winding from the electric element connected to a sealed terminal fixed to the container. A metal cylindrical member electrically connected to the end of the stator winding covered with the insulating tube, and a connection terminal electrically connected to the cylindrical member so that a part of the cylindrical member is exposed. And a heat-shrinkable insulating tube that covers the cylindrical member and the stator winding, and supplies power to the electric element by connecting the connection terminal to the sealed terminal.