JPH04331432A - Insulating device of motor for compressor - Google Patents

Abstract

PURPOSE:To prevent a disconnection of a bundling yarn at the time of shaping a coil end. CONSTITUTION:Bent parts 22, 23 bent at end sides 20, 21 of an interphase iniulating sheet 18 to a central side of the sheet, and a bundling yarn 6 installed at the bent part to shape a coil end, are provided, and the sides 20, 21 of the sheet 18 are not brought into contact with the yarn 6.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to insulation treatment at the coil end of a hermetic compressor.

0002

2. Description of the Related Art As a conventional interphase insulating paper for electric motors, there is one described in Japanese Utility Model Application Publication No. 2-94448. In the method described in this publication, insulating paper is inserted between the phases of the coil ends to provide interphase insulation, and then the coil ends are shaped together with the insulating paper using a binding thread.

[0003] Furthermore, in a device such as that described in Japanese Utility Model Application Publication No. 63-29359, a storage part for storing a connection part between a stator winding of a motor and a lead wire is made by welding overlapping parts of insulating paper. The welded portion on the outside of the insulating paper was provided inside the edge of the insulating paper.

0004

[Problems to be Solved by the Invention] With conventional interphase insulating paper, the binding thread is directly applied to the edge, so when shaping the coil end with the binding thread, the binding thread gets caught on the edge of the interphase insulating paper. There were cases where the binding thread broke.

[0005] In addition, in the conventional storage part, a hardened part is formed at the end of the insulating paper due to heat welding, and when shaping the coil end with binding thread after inserting this storage part into the coil end, the hardened part is formed. There were cases where the binding thread got caught and broke.

[0006] In order to solve these problems, the present invention provides an insulating device that can prevent the binding thread from breaking when shaping the coil end of a motor.

[0007]

[Means for Solving the Problems] The present invention provides a hermetic compressor in which an electric motor and a compression element are housed in a single hermetic container, and the inside of this hermetic container serves as a refrigerant flow path. It is equipped with interphase insulating paper for insulating between the phases of the coil end, a folded part where the edge of the interphase insulating paper is bent toward the center of the interphase insulating paper, and a binding string that is stretched over this folded part to shape the coil end. It is something that

[0008] In addition, Nomex thread is used as the binding thread, and the ends of the binding thread are impregnated with resin.

[0009] Furthermore, a storage part for storing the connecting part between the stator winding and the lead wire is inserted between the phases of the coil ends of the electric motor, and this storage part is made by folding insulating paper and overlapping a pair of ends. After that, it is formed by heat welding from the bent side toward the end side to the front of the end side.

0010

[Function] By using such an insulating device, when shaping the coil end of the motor with binding thread, the storage area that stores the ends of the interphase insulation thread and the connection between the stator winding and the lead wire can be used. It is possible to prevent the binding thread from being cut at the part that has been hardened by heat welding.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described below with reference to the drawings. FIG. 2 is a top view of the coil end of the electric motor. In this figure, 1 is the stator core of the motor, and three-phase stator windings 2, 3, and 4 are arranged in insulated slots at 120 mm.
It has been inserted incorrectly. Interphase insulating paper is inserted between the phases of these stator windings 2 to 4 to maintain insulation between each phase. Reference numeral 5 denotes a housing section for storing the connecting portions between the stator windings 2 to 4 and the lead wire 17, and is sandwiched between the stator winding 2 and the stator winding 3.

Binding threads 6 to 16 are used to shape the coil ends after interphase insulating paper and storage portion 5 are sandwiched between each phase. This binding thread uses Nomex thread (thread whose main component is aromatic polymeramide), which prevents the precipitation of oligomers compared to when conventional nylon binding threads are used.

[0013] In order to prevent the end of the Nomex thread from fraying after the coil end has been shaped, the end of the Nomex thread is impregnated with a resin such as nylon.

FIG. 3 is a sectional view showing a part of the stator shown in FIG. 2. FIG. In this figure, 18 and 19 are interphase insulating papers.

FIG. 1 is a plan view of the interphase insulating paper 18 shown in FIG. In this figure, 20 and 21 are interphase insulating paper 1
8, and is bent toward the center of the interphase insulating paper 18 from the dotted line position. This amount of bending is 20 on the edge,
It is about 21 to 5 mm.

FIG. 4 is a side view of the interphase insulating paper 18 shown in FIG. 1 with its edges 20 and 21 bent. The bent portions 22 and 23 are held down by the binding thread 6 as shown in FIG. In this way, since the binding thread 6 hits the folded portions 22 and 23 of the interphase insulating paper 18, the binding thread 6 is not cut at the end sides 20 and 21 of the interphase insulating paper 18.

Incidentally, only one of the edges 20 and 21 of the interphase insulating paper 18 may be bent to form an interphase insulating paper 19 shown in FIG. 3.

FIG. 5 shows an interphase insulating paper showing another embodiment of the interphase insulating paper shown in FIG. It is made by bending the end edge from the dotted line.

FIG. 6 is a front view of the storage section 5 shown in FIGS. 2 and 3. 21 to 23 are ends of the stator windings 2 to 3, and are connected to the lead wire 17 at connecting portions 24 to 26, respectively. The storage section 5 is formed by folding an insulating paper in half and then thermally welding the welded parts 27 to 30 using ultrasonic waves. Connection parts 24 to 26 are stored in the storage part.

The welded parts 27 to 30 are thermally welded halfway from the fold line of the insulating paper folded in half toward the opposite side. With this configuration, a portion where the insulating paper is overlapped is formed on the opening side of the storage portion 6, and the binding thread can be received in this portion. Therefore, the thermally welded hard part is not directly caught on the binding thread, and the binding thread can be prevented from breaking.

[0021]

Effects of the Invention The present invention provides an interphase insulating paper for insulating the phases of the coil ends of an electric motor, a folded part where the edge of the interphase insulating paper is bent toward the center of the interphase insulating paper, and a coil that is placed over this folded part. By shaping the ends, there is no need to cut the binding yarn at the edge of the interphase insulating paper when shaping the coil ends.

Furthermore, by using Nomex thread as the binding thread, precipitation of oligomers from the binding thread can be prevented.

[0023]Furthermore, a storage part for storing the connecting part between the stator winding and the lead wire was inserted between the phases of the coil ends of the electric motor, and this storage part was made by folding insulating paper and overlapping a pair of ends. After that, it is formed by heat welding from the bent side toward the end side to the front of the end side, so that the part that becomes hard due to heat welding will not get caught on the binding thread and break the binding thread.

[Brief explanation of drawings]

FIG. 1 is a front view of interphase insulating paper showing an embodiment of the present invention.

FIG. 2 is a top view of the stator of the electric motor.

FIG. 3 is a cross-sectional view of a portion of the stator shown in FIG. 2;

FIG. 4 is a side view of the interphase insulating paper shown in FIG. 1;

5 is a front view showing another example of the interphase insulating paper shown in FIG. 1. FIG.

6 is a front view of the storage section shown in FIG. 3. FIG.

[Explanation of symbols]

1 Stator 2 Stator winding 3 Stator winding 4 Stator winding 5 Storage section 6 Binding thread 17 Lead line 18 Interphase insulation paper 19 Interphase insulation paper 20 Edge 21 Edge 22 Bending part 23 Bending part 27 Welded part 28 Welded part 29 Welded part 30 Welded part

Claims (3)

[Claims] Claim 1: In a hermetic compressor in which an electric motor and a compression element are housed in a single hermetic container, and the inside of this hermetic container serves as a refrigerant flow path, a phase gap that insulates the phases of the coil ends of the motor is provided. A compressor comprising an insulating paper, a folded part in which the edge of the interphase insulating paper is bent toward the center of the interphase insulating paper, and a binding thread that is stretched over the folded part to shape the coil end. Insulation device for electric motors. 2. The insulation device for a compressor motor according to claim 1, wherein a Nomex thread is used as the binding thread, and an end of the binding thread is impregnated with resin. 3. In a hermetic compressor in which the electric motor and the compression element are housed in a single hermetic container, and the inside of this hermetic container serves as a refrigerant flow path, a stator winding is provided between the phases of the coil ends of the motor. Insert the storage part that stores the connection part between the wire and the lead wire, and after folding the insulating paper and overlapping a pair of ends, fold the ends from the folded side to the end side. An insulating device for a compressor motor, characterized by being formed by heat welding up to the front.