JP2013060815A - Electric compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric compressor capable of strengthening an electric insulation performance by a simple structure and work.SOLUTION: The electric compressor includes a motor (not shown), a compression means (not shown) driven by the motor, a metal casing (not shown) for storing the motor and the compression means, a power supplying terminal 2 retained through an insulating member 4, and further a power supply terminal 1 arranged at an opening (not shown) of the metal casing, wherein an insulating board 8 with a hole 9 for passing the power supplying terminal 2 is passed through the power supplying terminal 2 inside the metal casing, and further is brought into close contact with the insulating member 4. Accordingly, the creepage distance between the power supplying terminal 2 and the metal casing or a pedestal 3 or the like are added by both sides of the insulating board 8 without enlarging the power supply terminal 1 by such a simple work as passing the power supplying terminal 2 into the hole 9 of the insulating board 8, thereby strengthening the electric insulation performance.

Description

  The present invention relates to an electric compressor, and particularly to prevention of poor insulation between a power supply terminal of an electric compressor and a metal casing.

  There existed a conventional electric compressor as shown in FIGS. 5 and 6 (see, for example, Patent Document 1).

  FIG. 5 is a cross-sectional view of a conventional electric compressor described in Patent Document 1.

  In FIG. 5, the conventional electric compressor 11 includes a motor 15 and a compression mechanism portion 13 that is a compression means housed in a metal housing 14, and the compression mechanism portion 13 is driven by the motor 15. Thus, the gaseous refrigerant sucked from the suction pipe 16 is compressed and discharged from the discharge pipe 12. Electric power to the motor 15 is supplied from the outside through the power supply terminal 1 attached to the opening 14 a provided on the side surface of the metal housing 14.

  FIG. 6 is an enlarged partial sectional view showing the structure in the vicinity of the power supply terminal 1 of the electric compressor 11 shown in FIG. In order to prevent insulation failure between the power supply terminal 2 of the power supply terminal 1 and the metal housing 14 (base 3), it has been proposed to cover the power supply terminal 2 of the power supply terminal 1 with an insulating resin.

  In FIG. 6, the power feeding terminal 2 of the power feeding terminal 1 is electrically insulated and fixed by a pedestal 3 and an insulating member 4.

  The lead wire 6 from the motor 15 is electrically connected to the power supply terminal 2 via the grouper terminal 5. The exposed portions of the power supply terminal 2 and the grouper terminal 5 are covered with an insulating resin cover 7, and a creepage distance indicated by a double arrow is secured.

  FIG. 7 shows a case before insulation failure prevention in which the exposed portions of the power feeding terminal 2 and the group terminal 5 are not covered with the insulating resin cover 7 and only the creeping distance indicated by the double arrows can be secured.

JP 2001-182655 A

  The power supply terminal in the conventional electric compressor as described in Patent Document 1 has the following problems. The exposed portions of the power feeding terminal 2 and the grouper terminal 5 are covered with an insulating resin cover 7 to ensure a creepage distance. However, when the exposed portion is covered with the insulating resin cover 7, there is a difficulty in working and structure in order to prevent a gap from being generated.

  Moreover, when the oil and refrigerant used in the electric compressor are changed, the electric insulation performance as the electric compressor is changed by changing the electric insulation resistance thereof. For this reason, whenever the oil and refrigerant are changed, it is necessary to review and redesign the structure of the power supply terminal that is directly connected to the electrical insulation performance.

  When the creeping distance is ensured by lengthening the insulating member, there is a problem that the power feeding terminal 2 becomes longer and the power feeding terminal 1 becomes larger.

  The present invention solves such a conventional problem, and an object of the present invention is to provide an electric compressor capable of enhancing the electric insulation performance with a simple structure and work without increasing the size of the power supply terminal. And

  In order to solve the above-described conventional problems, an electric compressor according to the present invention includes a motor, compression means driven by the motor, a metal casing that houses the motor and the compression means, and an insulating member. An insulating plate having a held power feeding terminal and a power feeding terminal provided in an opening of the metal casing, and having a hole through which the power feeding terminal is passed, is provided inside the metal casing. In addition, the creepage distance between the power supply terminal and the metal housing, the pedestal with the power supply terminal, etc. is added to both the front and back sides of the insulating plate. Insulation performance can be enhanced. Further, since the insulating plate provided with a hole for passing the power supply terminal is simply passed through the power supply terminal inside the metal casing, the structure is simple and the operation can be easily performed without increasing the size.

  The electric compressor of the present invention can reinforce the electric insulation performance with a simple structure and work without increasing the size of the power supply terminal.

The fragmentary sectional view which shows the electric power feeding terminal vicinity of the electric compressor in Embodiment 1 of this invention Top view of the insulating plate of the electric compressor The top view of the insulating board of the electric compressor in Embodiment 2 of this invention The perspective view of the insulating plate of the electric compressor in Embodiment 3 of this invention Cross section of a conventional electric compressor Partial sectional view showing the vicinity of the power supply terminal of the electric compressor Partial sectional view showing the vicinity of the power supply terminal (before prevention of insulation failure)

  A first invention includes a motor, a compression unit driven by the motor, a metal housing that houses the motor and the compression unit, and a power feeding terminal held via an insulating member, and the metal A power supply terminal provided at the opening of the housing, with an insulating plate provided with a hole through which the power supply terminal is passed, passed through the power supply terminal inside the metal housing and further in close contact with the insulating member Thus, since the creepage distance between the power supply terminal and the metal housing, the pedestal on which the power supply terminal is arranged, and the like is added for both the front and back surfaces of the insulating plate, the electrical insulation performance can be enhanced. Further, since the insulating plate provided with a hole for passing the power supply terminal is simply passed through the power supply terminal inside the metal casing, the structure is simple and the operation can be easily performed without increasing the size.

  In the second invention, in particular, the insulating plate is pressed down and brought into close contact with the insulating member by the connecting member connected to the power feeding terminal inside the metal casing of the first invention. Can be adhered without using a special member.

  In the third invention, in particular, the insulating plate of the first or second invention is formed of an elastic member having elasticity, and even if the insulating member has irregularities, the insulating plate adheres to the insulating member. It can be done without gaps.

  In the fourth invention, in particular, the insulating plate according to any one of the first to third inventions is provided with a plurality of holes through which power supply terminals are passed. When the motor is a three-phase motor, three power supply terminals are provided. However, by providing three holes through which power feeding terminals are passed through the insulating plate, the work can be further facilitated by a single insulating plate. In addition, since the creepage distance between the power supply terminal and the pedestal is eliminated at the center of the power supply terminal, the electrical insulation performance can be further enhanced.

  In the fifth invention, in particular, the insulating plate according to any one of the first to fourth inventions is provided with a structure that creates an undulation in a plane, and the creepage distance between the power supply terminal and the metal housing, pedestal, etc. However, since not only the front and back surfaces of the insulating plate but also the structure that creates undulations is added, the electrical insulation performance can be further enhanced.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a partial cross-sectional view showing the vicinity of a power supply terminal of an electric compressor according to Embodiment 1 of the present invention, and FIG. 2 is a plan view of an insulating plate of the electric compressor.

  The main difference between the vicinity of the power supply terminal of the electric compressor in the present embodiment and the vicinity of the power supply terminal of the conventional electric compressor (see FIG. 6) is that the insulating resin cover 7 is not used in this embodiment. The other configuration is the same as that of the conventional electric compressor in that the insulating plate 8 is provided. Accordingly, the same parts as those of the power supply terminal of the conventional electric compressor are denoted by the same reference numerals, and the description thereof is omitted.

  In FIG. 1, a power feeding terminal 2 of the power feeding terminal 1 is electrically insulated by a pedestal 3 and an insulating member 4, and is fixed to the pedestal 3 through the insulating member 4. A lead wire 6 from the motor 15 is electrically connected to the power supply terminal 2 via a group-type terminal 5.

  FIG. 2 shows a plan view of the insulating plate 8 provided with a hole 9 through which the power supply terminal 2 is passed. In FIG. 1, the insulating plate 8 is passed through the power feeding terminal 2 inside the metal housing 14 and is in close contact with the insulating member 4.

  As a result, the creepage distance between the power supply terminal 2 and the base 3 (metal housing 14) is added to both the front and back surfaces of the insulating plate 8 (indicated by a double-headed arrow in FIG. 1). Can be strengthened. Further, since the insulating plate 8 provided with the hole 9 through which the power supply terminal 2 is passed is simply passed through the power supply terminal 2 inside the metal housing 14, the structure is simple and the work is easy without increasing the size. Can be done.

  In addition, as a method of bringing the insulating plate 8 into close contact with the insulating member 4, the hole diameter of the hole 9 through which the power supply terminal 2 is passed is tight with respect to the diameter of the power supply terminal 2, and other than press fitting, adhesive fixing, etc. The insulating plate 8 can be pressed and brought into close contact with the insulating member 4 by connecting members (not shown) such as a grouper terminal 5 and a connector connected to the power feeding terminal 2 inside the metal housing 14.

  Thereby, the insulating plate 8 can be adhered to the insulating member 4 without preparing a special member. Further, a spring may be interposed between the connection portion and the insulating plate 8.

  Further, the insulating plate 8 may be formed of an elastic member having elasticity. Thereby, even if the insulating member 4 has irregularities, the insulating plate 8 can be closely attached to the insulating member 4 without a gap.

(Embodiment 2)
FIG. 3 is a plan view of an insulating plate of the electric compressor according to the second embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the same part as the electric compressor in the said Embodiment 1, and the description is abbreviate | omitted.

  In the insulating plate 8 in the first embodiment, one hole 9 through which the power feeding terminal 2 is passed is provided. In the present embodiment, as shown in FIG. It is provided.

  Thereby, when the motor 15 is a three-phase motor, the power supply terminal 2 is three. However, by providing the insulating plate 10 with three holes 9 through which the power supply terminals 2 pass, Work can be made easier. Moreover, since the creeping distance between the power supply terminal 2 and the pedestal 3 is eliminated at the center of the power supply terminal 1, the electrical insulation performance can be further enhanced.

(Embodiment 3)
FIG. 4 is a perspective view of an insulating plate of the electric compressor according to Embodiment 3 of the present invention. In addition, the same code | symbol is attached | subjected to the same part as the electric compressor in the said embodiment, and the description is abbreviate | omitted.

  As shown in FIG. 4, the electric compressor in the present embodiment is provided with a wall 18 as a structure that creates undulations on a flat surface on an insulating plate 17, whereby the power feeding terminal 2 and the pedestal 3 ( The creepage distance from the metal housing 14) is not only the front and back surfaces of the insulating plate 17, but also the wall 18 as a structure that creates undulations (indicated by double arrows), so that electrical insulation The performance can be further enhanced.

  As described above, the electric compressor according to the present invention can reinforce the electric insulation performance with a simple structure and work without increasing the size of the power supply terminal. Applicable to.

DESCRIPTION OF SYMBOLS 1 Feeding terminal 2 Feeding terminal 3 Base 4 Insulating member 5 Grouper terminal 6 Lead wire 8, 10, 17 Insulating plate 9 Hole 11 Electric compressor 13 Compression mechanism part (compression means)
14 Metal enclosure 15 Motor 18 Wall

Claims (5)

A motor, a compression unit driven by the motor, a metal housing that houses the motor and the compression unit, and a power feeding terminal held via an insulating member, and an opening of the metal housing An electric compression system comprising: a power supply terminal provided; and an insulating plate provided with a hole through which the power supply terminal is passed, is passed through the power supply terminal inside the metal housing and is further in close contact with the insulating member Machine. The electric compressor according to claim 1, wherein an insulating plate is pressed down and brought into close contact with the insulating member by a connecting member connected to a power feeding terminal inside the metal casing. The electric compressor according to claim 1 or 2, wherein the insulating plate is formed of an elastic member having elasticity. The electric compressor according to any one of claims 1 to 3, wherein the insulating plate is provided with a plurality of holes through which power supply terminals are passed. The electric compressor according to any one of claims 1 to 4, wherein the insulating plate is provided with a structure that creates undulations on a flat surface.