JPH079059U - Protective device for hermetic electric compressor - Google Patents

Abstract

(57) [Summary] [Purpose] To obtain a compact and easy-to-install protective device. A protective device 1 comprises a protector 2 having a metal airtight container and a sheet-like insulating member 5 covering the protector 2. The protector 2 has conductive lead pins 3A and 3B. One of the lead pins 3A has a receptacle 4 as an indicating member, and the other of the lead pins 3B has a lead wire 21C. The insulating member 5 has a notch 3A, one side of which is wound around the protector 2 so as to cover the lead pin 3B, and the other side is wound so that only the lead pin 3A and the receptacle 4 project to the outside. By supporting and fixing the protective device 1 to the pins of the cluster in the housing of the hermetic electric compressor by the receptacle 4 serving as an indicating member, the protective device can be easily fixed and the exposed portion of the charging portion can be minimized. Prevent short circuit accidents.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement in a method of mounting a heat-sensitive motor protector mounted on an electric motor housed in a hermetically sealed housing of an electric compressor.

[0002]

[Prior art]

 When the hermetic electric compressor is operated with overload, the motor is disconnected from the power supply by making it sensitive to the motor temperature and the refrigerant gas temperature, and heat is sensed inside the housing of the hermetic electric compressor to prevent the motor from burning. A motor protector (hereinafter referred to as protector) is installed.

As a protection device for a conventional hermetic electric compressor, since the main body of this type of protector is a metal airtight container having pressure resistance, it serves as a charging section, and is therefore made of a hard film material such as polyester film. It was covered with an insulating member and was in contact with the surface of the coil end of the motor and fixed with a binding thread.

Japanese Patent Laid-Open No. 62-296739 discloses a protector housed in an electrically insulating socket and mounted on a pin of a cluster in a close-closed housing. Further, Japanese Patent Laid-Open No. 63-28246 discloses a protector for a hermetic electric compressor which is mounted outside the socket without having an insulating member.

[0005]

[Problems to be solved by the device]

 Since the hermetic housing of hermetic electric compressors has recently become very small, it is becoming increasingly difficult to install a protective device on the coil end of the motor.

However, when the coil ends of the motor are not directly fixed, it is necessary to take special fixing means. Also, in the case of a structure in which the protector main body is housed in the socket in order to simplify the fixing means, there is a problem in heat transfer, and it is necessary to make the socket itself large or to have a special shape. There is a problem that it will occur. In addition, if the socket is mounted outside the socket without having an insulating member, a problem will naturally occur in the electrical insulation between the socket and the sealed housing.

In addition, when the protector is mounted in close proximity to the position where the container portion and the lid portion forming the closed housing are welded to each other, the housing of the polyester film generally used as the insulating member of the conventional protector is welded to the housing. Sometimes it is melted by radiant heat and there is a problem that the insulation function is lost. Further, there is a similar problem when the operating temperature of the protector is set particularly high.

Therefore, the applicant of the present invention has proposed a protective device for a hermetic electric compressor, which is attached to an outer portion of a socket and is attached to a pin of a cluster, by covering an insulating member in Japanese Utility Model Laid-Open No. 5-27291. However, in this protection device, since the protection device is directly attached to the pins of the cluster, it is very close to the metal part of the cluster and the closed housing, and the two conductive terminals of the protector, which is the charging part, are located outside the insulating member. As a result, the conductive terminals on the side not mounted in the socket are not sufficiently close to the metal part of the cluster and the closed housing, and there is no insulator between them, which could cause a short circuit.

Further, if the protector body including the conductive terminals of the protection device is entirely covered with an insulating member, the support member becomes unnecessarily large in size and the entire protection device also becomes large in size.

An object of the present invention is to provide a protective device having an insulating member which is easy to mount and has excellent heat resistance in order to solve the above problems.

[0011]

[Means for Solving the Problems]

 The hermetic electric compressor protection device of the present invention is a hermetic electric compressor having a protector which is supported by a support member on a pin of a cluster in a hermetic housing, wherein the protector is a sheet-shaped insulating member having a cut portion. The insulating member is covered with a protector, and the protector is enclosed in a state where only the portion near the supporting member projects from the cutout portion to the outside, and the insulating member is fixed and molded so that the protector does not come out from the insulating member. It is characterized by having done.

Another feature is that the indicator member is housed in the socket so that the protector is supported by the support member in the socket held by the cluster in the closed housing.

Another feature is that the insulating member is made of a sheet-shaped heat-resistant insulating material having a heat-resistant temperature of 155 ° C. or higher.

[0014]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS. The hermetic electric compressor 10 shown in FIG. 1 is a so-called high-pressure housing compressor. In the hermetic electric compressor 10, the hermetic housing 11 is composed of a robust iron container portion 12 and a lid portion 13. A compressor 16 is arranged near the lower end of a rotary shaft 15 fixed to a rotor 14 of the electric motor, and an outer peripheral portion of the compressor 16 is fixed below the sealed housing 11. The outer periphery of the stator 17 of the electric motor is fixed near the center of the container portion 12. The windings of the stator are electrically insulated and wound around the stator 17, and the coil ends 18 thereof project from the upper and lower ends of the stator 17 as shown in the drawing. A refrigerant (not shown) such as CFC is enclosed in the hermetic housing together with the lubricating oil 19.

A cluster 20 hermetically sealed with glass is hermetically fixed to the lid portion 13 of the hermetically sealed housing 11 in a metal annular body for electrically insulating and supporting the conductive pins 20A, 20B and 20C. The lead wires 21A and 21B connected to the main winding wire and the auxiliary winding wire of the electric motor are respectively connected to two of the conductive pins by a receptacle, and the remaining one of the conductive pins is shown in FIG. Such a protector 2 is connected as described later.

The protector 2 is provided with a thermo-responsive body such as a bimetal in its metal container, and the thermo-responsive body drives a movable contact at the time of overheating or overcurrent to make contact with a fixed contact that makes a pair with the movable contact.・ Opens and closes the electric circuit. This protector 2 is positioned by a receptacle 4 which is a supporting member fixed to a metal lead pin 3A, which is one of the conductive terminals, in a predetermined positional relationship by welding or the like, and is a tab (not shown) fixed to the conductive pin of the cluster 20. It is fitted and fixed to the terminal. Further, a lead wire 21C covered with an insulator is connected to the lead pin 3B of the protector 2 by a method such as welding, and one end of each of the main winding wire and the auxiliary winding wire of the motor is connected to a common wire. There is.

Since the protector 2 is a charging unit composed of a metal container, the protector 2 is covered with an insulating member 5 to form the protection device 1. The insulating member 5 is made of, for example, polyester or polyamide paper having a heat resistance of 155 ° C. or higher, and its developed shape is one sheet-shaped insulating member 5 provided with a cut portion 5A as shown in FIG. It has a shape in which one end is divided into winding portions 5B and 5C. Then, the winding portion 5B of the insulating member 5 is wrapped around the protector so as to cover the connecting portion between the lead pin 3B and the lead wire 21C, and the end portion 5D thereof is fixed by a method such as ultrasonic welding. The protection device 1 is constructed by winding the winding portion 5C around the protector 2 so as not to cover the lead pin 3A and the receptacle 4, and covering the end portion 5E with a method such as ultrasonic welding and enclosing the protector 2. It

With such a configuration, it is possible to easily obtain the protective device 1 in which the charged portion of the protector 2 is exposed to the minimum, and particularly, the lead pin 3 B of the protector 2 and the metal of the cluster 20. It is possible to eliminate the risk of short-circuiting with the ring-shaped part or the conductive pin that has a different potential.

In this embodiment, a receptacle is used as a supporting member of the protective device and is connected and fixed to the tab terminal fixed to the conductive pin of the cluster. However, the tab terminal is used as the supporting member of the protective device. Needless to say, the same effect can be obtained by fixing the receptacle on the conductive pin side of the cluster or by directly connecting and fixing the support member of the protective device to the conductive pin.

Next, another embodiment of the present invention will be described with reference to FIGS. 4 to 7. The same parts as those in the above-described embodiment are designated by the same reference numerals and the description thereof will be omitted. The hermetic electric compressor 30 shown in FIG. 4 is a so-called high-pressure housing compressor, and the electric motor and the compressor 16 are provided in the hermetic housing 11 made of metal. The cluster 20 is hermetically fixed to the lid portion 13 of the hermetic housing 11, and the socket 31 as shown in FIGS. 5 and 6 is attached to the conductive pin of the cluster 20 through the connection holes 31A, 31B and 31C. It is fitted and fixed by 32A, 32B and 32C.

In this protection device 41, a protector unit 33 is provided in which a protector 2 having a receptacle 32C as a supporting member is covered with an insulating member 5 so that only a conductive terminal 3A and a supporting member 32C project from a cut portion 5A to the outside. Is supported and fixed to the socket 31 by a receptacle 32C.

With such a configuration, it is possible to easily obtain the protective device 41 in which the exposed portion of the protector 2 which is the charging portion is minimized as in the above-described embodiment, and in particular, the protector is provided. It is possible to eliminate the risk of a short circuit between the second lead pin 3B and the metal annular portion of the cluster 20 or the conductive pin. Further, since the receptacles are fixed by the sockets 31, the positioning of the respective receptacles is facilitated, and the attachment to the cluster 20 is performed on the three terminal pins at once, which is very easy.

In this embodiment, polyester is used as the insulating material and polyamide paper is used as the heat resistant insulating material having a heat resistant temperature of 155 ° C. or higher. However, the insulating material is not limited to this. Further, it is needless to say that the cluster is not limited to the one having three conductive pins, but the same effect can be obtained even if the conductive pin is not limited to three. Further, it is needless to say that the hermetically-sealed electric compressor can be applied to a known compressor such as a scroll type, a rotary type, a reciprocating type, or a so-called low-pressure hermetically sealed housing.

[0024]

[Effect of device]

 According to the present invention, the protector of the protection device is covered with a notched insulating member other than the vicinity of the supporting member, and the supporting member is projected from the notched portion, so that the protector is easily exposed. It is possible to obtain a protection device with a minimum of charged parts, especially the risk of short circuit between the lead pin or housing on the free side of the protector support member and the metal annular part of the cluster or the conductive pin of different potential. It can be lost.

Further, when the socket is used, the positioning of each receptacle is facilitated because the receptacle is fixed by the socket, and the mounting to the cluster is performed for a plurality of terminal pins at one time, which is extremely difficult. To be easier.

Further, with the above-mentioned configuration, it is possible to eliminate the need to take any special means for fixing the protector, and prevent the protection device and the hermetic electric compressor from increasing in size.

Further, by using an insulating member having a heat resistance of 155 ° C. or higher, the insulating coating is melted even when the radiant heat at the time of welding the closed housing and the operating temperature of the protector are set particularly high. As a result, the insulation function will not be lost.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a hermetic electric compressor provided with an embodiment of the present invention.

FIG. 2 is a side view of a protection device according to an embodiment of the present invention.

FIG. 3 is a development view of the insulating member of the present invention.

FIG. 4 is a vertical sectional view of a hermetic electric compressor provided with another embodiment of the present invention.

FIG. 5 is a partial sectional view of a protection device according to another embodiment of the present invention.

FIG. 6 is an overhead view of a protective device according to another embodiment of the present invention.

FIG. 7 is a side view of the protector unit of the present invention.

[Explanation of symbols]

 1, 41: Protective device 2: Protector 3A, 3B: Lead pin 4, 32C: Support member (receptacle) 5: Insulating member 5A: Cut part 10, 30: Hermetic electric compressor 11: Hermetic housing 20: Cluster 20A, 20B , 20C: Conductive pin 31: Socket 33: Protector unit

Claims (3)

[Scope of utility model registration request] 1. A hermetic electric compressor having a protector supported by a support member on a pin of a cluster in a hermetic housing, wherein the protector has a sheet-like insulating member provided with a cut portion, and the insulating member is A hermetically-sealed electric compression characterized in that the protector is encapsulated in a state in which the protector is covered and only the portion near the support member projects from the cutout portion to the outside, and the insulating member is fixed and molded so that the protector does not come out from the insulating member. Machine protection device. 2. The hermetically sealed electric compressor according to claim 1, wherein the protector has an indicator member housed in the socket so as to be supported by the support member in the socket held by the cluster in the hermetic housing. Machine protection device. 3. The insulating member is made of a sheet-shaped heat-resistant insulating material having a heat-resistant temperature of 155 ° C. or higher.
Alternatively, the hermetic electric compressor protection device according to claim 2.