JPH06189497A - Protector for closed type electric compressor - Google Patents

Abstract

PURPOSE:To provide a protector which is easily attached to a closed type electric compressor. CONSTITUTION:A protector 30 is provided with a closed metal outer case 31 that acts as one terminal and has a superior heat conductivity, and a conductive terminal pin 32 electrically insulated from the outer case 31. A receptacle 36A is conductively fixed to the outer case 31, and a lead wire 13 used for connection with a coil of an electric motor is fixed to the terminal pin 32. A tab 35A is fixed to the inside of a conductive pin 16A of a cluster disposed in a closed type electric compressor. As a result of the fitting of the receptacle 36A to the tab 35A in a fixed manner, the protector 30 is electrically connected to and securely positioned on the conductive pin 16A.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hermetic electric compressor, in which a movable contact is driven by a heat responsive body made of a metal such as a bimetal which changes its shape depending on different temperatures in order to protect the electric motor from overload. An improvement to provide a mechanism for opening and closing the current flowing through the electric motor between the movable contact and a pair of fixed contacts in a sealed outer box, and to easily attach a protector to a part of the outer box and the compressor. The present invention proposes a protector for a hermetic electric compressor provided with the above described mechanism.

[0002]

2. Description of the Related Art Conventionally, a protector for a hermetic electric compressor of this type is embedded in a coil end portion of a stator winding of an electric motor housed in a hermetically sealed container, or closely fixed on the coil end. The method of tying it up with a thread was adopted. Then, when an abnormality in the electric current or temperature of the electric motor is detected, the electric current supplied to the electric motor is shut off to protect the winding of the electric motor from overheating, and it automatically recovers to supply the electric current to the electric motor. It operates as a protection switch that continues operation and, if there is an abnormality, repeats interruption and energization again.

Further, the present applicant has filed Japanese Patent Application No. 61-170442.
No. 1 proposes a protector for a hermetic electric compressor. The protector for the hermetic electric compressor will be described with reference to FIG. 4. The hermetic container 10 is a robust iron container part.
It is composed of 11 and a lid part 12. A compressor P is arranged near the lower end of a rotating shaft S fixed to a rotor R of an electric motor, and an outer peripheral portion PO thereof is fixed below the hermetic container 10. An electric motor stator F, which is arranged so as to surround the rotor R, has its outer periphery fixed from the center of the container portion 11 to the vicinity of the seam end E. When the inner surface of the closed container 10 is a circle, the outer periphery of the stator F is formed into a polygonal shape so that a gap is formed in the axial direction rather than being in close contact with the entire surface. The stator windings are electrically insulated and wound around the stator F, and the coil ends W of the stator F are extended to the upper and lower ends of the stator F as shown in the figure, which are formed by binding with a nylon thread, for example. . Although the heat medium gas such as Freon is not shown, the lubricating oil O is shown in the lower part of the closed container 10. A discharge pipe 17 through which the heat medium gas is delivered by the compressor P is provided at the upper part of the closed container 10. In the lid portion 12 of the closed container 10, a cluster 16 hermetically sealed with glass for electrically insulating and supporting the conductive pins 16A, 16B, and 16C in a metal annular body is provided.
Is airtightly fixed.

In FIG. 5, a protector 30 has a mechanism in which a movable contact is driven by a thermo-responsive body such as a bimetal in a sealed outer casing 31 made of metal, and a fixed contact which makes a pair with the movable contact is provided. The outer box 31 serving as one of the terminals serves to open and close the electric circuit between the terminal box 32 fixed by an electric insulating material, and the outer box 31 is connected to the receptacle 13A by a connecting fitting 34. Are fixed by a method such as welding. The lead wire is attached to the terminal pin 32 which is the other end.
13 is connected, and the other end of the lead wire 13 is connected to a common end that is a collective of one end of the main winding and one end of the auxiliary winding of the electric motor. Lead wire 14 for other receptacles 14A and 15A
And 15 are respectively connected, and the other ends thereof are connected to the other end of the main winding and the other end of the auxiliary winding. Receptacle 13A / 1
4A and 15A are housed in a socket 20 made of an electrically insulating material such as phenol resin, and are provided with partition walls 22 and 23 which are electrically insulated from each other. A through hole (not shown) is provided on the surface of the socket 20 facing the cluster 16, and the socket 20 allows the three receptacles 13A, 14A, and 15A to be simultaneously fitted to the conductive pins 16A, 16B, and 16C, respectively. A power source (not shown) is connected to the outer end of the closed container of the conductive pin, for example, one of the power sources is connected to the conductive pin 16A.
The other side of the power source is connected to the conductive pin 16C via the conductive pin 16B and a capacitor.

According to this protector, since the position of the protector in the closed container is determined by fixing the socket to the cluster, the protector can be easily attached and positioned.

[0006]

Recently, due to the miniaturization of the hermetic electric compressor, the space for attaching the protector to the coil end portion has become narrower in the conventional one, or the protector is tied to the coil end with a thread. There is a problem that the process takes time.

Further, in the protector for the hermetic electric compressor described above, it is necessary to attach the protector and the lead wire to the socket before attaching the protector to the cluster.

[0008]

A protector according to the present invention includes a mechanism in which a pair of contacts are opened and closed by a heat responsive body such as a bimetal in a sealed metal outer casing, which serves as one terminal. The box and the other terminal have at least one terminal pin that is airtightly fixed to a part of the outer box by an electrically insulating material such as glass, and a receptacle as described later is fixed to the outer box. In a hermetic electric compressor using this protector, the stator of the electric motor is fixed directly to the inner surface of the hermetic container, the rotor is rotatably supported by the magnetic field of the stator, and the compressor is mounted on the rotating shaft. Are connected to each other, and heat medium gas such as Freon gas in the closed container is sent to the outside from the discharge pipe of the closed container to perform work, and then the heat medium gas is returned to the compressor again. A cluster in which a plurality of conductive pins for connecting the motor windings to an external power source are sealed in a metal annular body with an insulating material such as glass is arranged in the closed container, and one of the conductive pins is provided. The position of the protector in the closed container can be determined by fitting the receptacle of the protector to.
On the other hand, since the stator of the winding of the electric motor is directly fixed to the inner surface of the closed container, the positions of both the main winding and the auxiliary winding, which are wound around the stator in an insulated manner, are of course fixed. Since the rotor and its windings are also fixed in position, the temperature correlation between the protector and the motor windings has a significant correlation and is an easy-to-install and economical seal for protecting the motor windings. Type protector for electric compressor can be obtained.

[0009]

Embodiments of the present invention will be described with reference to the drawings. The same components as those shown in FIGS. 4 and 5 are designated by the same reference numerals and the description thereof will be omitted. Figure 1
Further, as shown in FIG. 2, a receptacle 36A having a shape to be fitted to a flat plate-like tab described later, which is welded and fixed to the conductive pin of the cluster, is conductively fixed directly to the outer box of the protector. The conductive pins 16A, 16B, and 16C of the cluster 16 have flat tabs 35A, 35B, and 35C as shown in FIG.
Are welded. Tab 35A on outer case 31 of protector 30
A receptacle 36A having a shape for tightening, fitting and fixing is welded. The protector 30 is reliably positioned by fitting and fixing the receptacle 36 on the tab 35A. Receptacles 36B and 36C connected to the lead wires 14 and 15 are fitted and fixed to the tabs 35B and 35C of the remaining conductive pins.
With such a structure, the protector can be positioned with respect to the conductive pins of the cluster without using the socket.

Further, if the lead wires 14 and 15 are prevented from conductively contacting other portions or short-circuiting each other even if the lead wires 14 and 15 rotate at their mounting positions, the lead wires 14 and 15
The tab of the conductive terminal connected to 15 may be omitted.

Although not described in this embodiment, it is needless to say that the same can be applied to a so-called 2-pin protector having an auxiliary heater.

[0012]

According to the protector for a hermetic electric compressor of the present invention described above, one of a plurality of receptacles to be connected to the conductive pin of the cluster, which is necessary for supplying power to the electric motor, is electrically connected to the outer box of the protector. By fixing this protector to the tab fixed to the conductive pin, the protector can be positioned and fixed and the electrical connection can be made. Compared to this, it is extremely labor-saving, and in the case of a small electric motor, the coil end of the winding is small, so there is no need for extra space to tie the protector as in the past, and no extra material is required. There is an excellent effect that can be done.

[Brief description of drawings]

FIG. 1 is a view showing a state in which a protector according to an embodiment of the present invention is connected to a conductive pin of a cluster.

FIG. 2 is a partial cross-sectional view of a hermetic electric compressor according to an embodiment of the present invention.

FIG. 3 is a view showing a part of the cluster attached to the lid part from the inside of the closed container.

FIG. 4 is a vertical sectional view of a hermetic electric compressor.

FIG. 5 is a plan view in which a part of an outer shell of a socket that houses a receptacle is removed.

[Explanation of symbols]

 10: Airtight container 13A, 14A, 15A, 36A, 36B, 36C: Receptacle 16: Cluster 16A, 16B, 16C: Conductive pin 30: Protector 31: Outer box 32: Terminal pin 35A, 35B, 35C: Tab F: Motor fixed Child P: Compressor R: Electric motor rotor S: Rotating shaft W: Coil end

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yasukazu Mizutani 61-61, Rokuta, Midori-ku, Nagoya (72) Inventor Shozo Iyoda 3--17-1, Higashiyamamoto-machi, Chikusa-ku, Nagoya

Claims (1)

[Claims] 1. A hermetic electric compressor in which a stator of an electric motor is fixed to an inner surface of a hermetic container, a rotor is axially supported at the center of the hermetically sealed container, and the compressor is operated by the rotation of the rotor. A cluster consisting of a plurality of conductive pins for connecting the winding of the electric motor to an external power source is hermetically fixed on a hermetically sealed container, and has a metal hermetic outer box with good thermal conductivity as one terminal. And a heat-actuated protector having one or more terminal pins electrically insulated from the outer casing as the other terminals, and the other terminals having the other terminals through one end of each of the main winding and the auxiliary winding of the motor winding and a lead wire. The outer box has a receptacle connected to one of the conductive pins of the cluster, and the other conductive pin of the cluster is connected via a lead wire to the main winding and auxiliary winding of the motor. Each other of the line It is connected to the end of the protector, and the receptacle of the protector is fitted and connected to the tab terminal fixed to the conductive pin of the cluster. Characteristic protector for electric compressor.