JP2004176682A - Electric compressor for coolant - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve workability, and easily achieve compactness in manufacturing an electric compressor for coolant. <P>SOLUTION: This power compressor has a connection terminal unit 10 in a sealed container. In the connection terminal unit 10, a terminal at a tip of a lead wire 9 connected to a coil of a motor is installed and fixed to a connection housing 8 of electric insulation. In the sealed container, a sealed terminal 7 to feed the motor is inserted and fixed. The connection terminal unit 10 is fixed at position facing an installation position facing the sealed terminal 7 such as on a coil end 3A of the motor. By installing and fixing the sealed terminal 7 to the sealed container, a lead terminal pin 7A is inserted into a through hole 8B in the connection terminal unit to be connected to the terminal of the lead wire 9. In connecting the sealed terminal with a motor winding, work of extending the lead wire from the container is not necessary, and connection work can be conducted in a narrow space. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
[Industrial applications]
The present invention relates to an electric compressor for a refrigerant, and more particularly to a terminal structure of a semi-hermetic electric compressor suitable for use in an air conditioner of an electric vehicle, a fuel cell vehicle, or the like.
[0002]
[Prior art]
Conventionally, an open type compressor driven by transmitting rotation of an engine via a belt or the like has been used as a refrigerant compressor for a car air conditioner. Since the drive system of this conventional compressor is linked to the engine, it is difficult to change the number of revolutions for cooling capacity adjustment. However, it was necessary to use a variable capacity compressor having a complicated structure.
[0003]
2. Description of the Related Art In recent years, those using an electric motor as a power source, such as an electric vehicle or a fuel cell vehicle, instead of a conventional internal combustion engine as a power source of a vehicle, are coming to practical use. In the case of these electric vehicles, it is not necessary to use the driving force of the traveling system as power for the refrigerant compressor, etc., and by directly driving with a dedicated electric motor independent of the traveling driving system, energy efficiency is improved and the number of rotations is increased. The control of the capacity by the control of the control is also facilitated. In addition, since there is no need for mechanical interlocking, the degree of freedom of arrangement of the compressor is increased.
[0004]
BACKGROUND ART As a refrigerant electric compressor, a hermetically sealed electric compressor used for a room air conditioner or a refrigerator for home use is widely known. (See, for example, Patent Document 1.) This is an enclosure in which an AC motor and a compressor are sealed in a hermetically welded metal container, and can be used in the above-described electric vehicle by controlling the power supply with an inverter or the like. However, the material of the container is made of iron for welding, and the weight of the container is problematic when used for automobiles. Therefore, if it is attempted to use an aluminum container used in a conventional open type compressor for weight reduction, it is difficult to make a hermetically sealed electric compressor by welding like an iron container because aluminum is difficult to weld. Therefore, a semi-hermetic electric compressor in which an aluminum container is mechanically fixed with bolts or the like is used. (For example, see Patent Document 2)
[0005]
Such a hermetic electric compressor requires a hermetic terminal for electrically connecting the electric motor inside the container to a power supply outside the container. The hermetic terminal has a through hole formed in a metal plate, and a metal conductive terminal pin is hermetically penetrated and fixed to the through hole with an electrically insulating material such as glass. As the airtight terminal, an iron alloy is used as a metal plate, and a glass selected so as to have an expansion coefficient matching the metal plate is used. (For example, see Patent Document 3)
[0006]
[Patent Document 1]
JP-A-62-29776
[Patent Document 2]
JP-A-6-221282 [0008]
[Patent Document 3]
Japanese Utility Model Publication No. 56-16777
[Problems to be solved by the invention]
In the conventional hermetic electric compressor, the hermetic terminal is hermetically fixed by welding to a through hole provided in an iron container, and welding work is difficult after assembling the container. Is fixed in advance. On the other hand, when an aluminum container is used as the container, since the material is difficult to weld as described above, the sealed terminal is also mechanically fixed with bolts or the like.
[0010]
Here, the connection between the airtight terminal and the motor winding becomes a problem when the airtight terminal is attached. This will be described with reference to FIGS. In this semi-hermetic electric compressor 101, an AC motor 103 and a compressor 104 are arranged in an aluminum hermetic container 102. The electric compressor of this example is a low-pressure compressor in which the compressor 104 is a scroll compressor. Further, the container 102 has a bottomed cylindrical portion 102A that houses an electric motor and one end also serves as a rotor bearing of the electric motor, a compressing portion 102B that houses a driving portion of the compressor, and a high-pressure portion 102C that also serves as a fixed side of the compressor and has a refrigerant discharge hole. These are fixed to each other by being fastened with bolts (not shown), and the fastening surfaces are made airtight by a seal member. The closed-end cylindrical portion 102A is provided with a refrigerant suction hole 102D at a closed end, and the refrigerant sucked into the closed container 102 through the suction hole 102D from a heat exchanger or the like (not shown) cools the electric motor 103 while cooling. , Is compressed by the compressor 104 and sent again from the discharge hole 102E to the heat exchanger.
[0011]
In this electric compressor 101, power is supplied to the electric motor 103 through a sealed terminal 105. The hermetic terminal 105 is the same as that used in iron containers in conventional hermetic electric compressors and the like. The hermetic terminal 105 is fixed to a holder 107 for mechanical fixing with bolts or the like. Have been. The holding body 107 is an iron cylindrical member having an inner diameter smaller than that of the periphery of the hermetic terminal 105, and has one end hermetically welded to the periphery of the hermetic terminal 105 over the entire circumference. A flange for fixing to the closed container is provided on the outer periphery of the holding member 107, and is mechanically fixed to the mounting hole 102F of the bottomed cylindrical portion 102A with a bolt or the like.
[0012]
Conductive terminal pins 105A are hermetically fixed to the hermetic terminal 105 with an electrically insulating material such as glass to electrically connect the inside and the outside of the sealed container. A tab terminal 105B is attached to the inside of the container of the conductive terminal pin 105A, and a lead wire 108 extended from the motor winding is connected to the tab terminal using a receptacle 108A.
[0013]
As shown in FIG. 6, the connection work is performed by pulling out the lead wire 108 from the mounting hole 102F of the bottomed cylindrical portion 102A of the hermetic container, connecting the tab terminal 105B of the conductive terminal pin 105A of the hermetic terminal and the receptacle 108A, and then reconnecting the lead. The wire 108 is housed by being pushed back into the container, the holder is fixed together, and the contact surface is made airtight by a seal member.
[0014]
However, in this electric compressor 101, the operation of pulling out the lead wire 108 once and pushing it back into the container is troublesome, and also requires a place for accommodating the pushed back lead wire 108 as shown in FIG. Particularly, in the case of an electric compressor for an automobile, downsizing is required. Further, the lead wire 108 having a sufficient length to be pulled out of the container at the time of work is difficult to make the distal end portion where the receptacle 108A is mounted face the mounting hole 102F even if the electric motor 103 is positioned and positioned with respect to the closed container. Also, the work of drawing out the lead wire is troublesome.
[0015]
Further, even in the case where the end of the hermetic container to which the hermetic terminal is attached is made as a separate lid-like part as in a conventional hermetic electric compressor, there is a problem that an extra lead wire is required. This is because extra work is required when connecting the lead wire connected to the motor to the sealed terminal that is welded and fixed to the end of the container in advance. It is necessary to process so as not to interfere with the suction or discharge holes. In both cases, the work of connecting the sealed terminal to the motor winding requires human labor, and it is difficult to automate the work. Therefore, there is a demand for a connection method that improves workability in manufacturing and facilitates downsizing of the electric compressor.
[0016]
[Means for Solving the Problems]
Therefore, in the electric compressor for a refrigerant of the present invention, the connection terminal unit having the terminal electrically connected to the motor winding is fixed in the container and at a position other than the sealed terminal, and the sealed terminal is positioned at a predetermined position of the container. The terminal is characterized in that it can be electrically connected to the terminal of the connection terminal unit previously fixed at the above-mentioned position by airtightly fixing the terminal.
[0017]
Another feature is that an opening for attaching a hermetic terminal is provided in the container, and the connection terminal unit is fixed so as to face the opening.
[0018]
Still another feature is that the sealed terminal is fixed to a component constituting the container in advance, and the container component is attached to the corresponding component to form a sealed container, thereby electrically connecting the sealed terminal and the terminal of the connection terminal unit. On the point.
[0019]
Further, these are characterized in that the connection terminal unit is arranged on the electric motor.
[0020]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an example of an electric compressor for a refrigerant of the present invention will be described with reference to FIGS. FIG. 1 is a cross-sectional view of the electric compressor for refrigerant, and FIG. 2 is a perspective view showing only main components taken out. This electric compressor for refrigerant 1 is a semi-hermetic electric compressor in which an electric motor 3 and a scroll compressor 4 are provided in a hermetically sealed container 2 made of aluminum, similarly to the above-mentioned conventional example. The closed container 2 of this example is also composed of a bottomed cylindrical portion 2A for housing the electric motor, a compression portion 2B for housing the driving portion of the compressor, and a high-pressure portion 2C having a refrigerant discharge hole which also serves as a fixed side of the compressor. It is fastened by bolts or the like with the seal member interposed, and is airtightly fixed. The bottomed cylindrical portion 2A is provided with a mounting hole 2D as an opening for an airtight terminal, and an airtight terminal 7 fixed to a fixing member 6 having a flange or the like for fixing with a bolt or the like is airtightly fixed. . In this example, an aluminum sealed container will be described as an example, but the material of the sealed container is not limited to this, and it goes without saying that an iron container or the like can be similarly used. Further, if the airtight terminal can be directly fixed to the container, it is not always necessary to prepare a fixing member.
[0021]
In this embodiment, a connection housing 8 is arranged on the coil end 3A of the electric motor 3. The connection housing 8 is made of an electrically insulating plastic or the like. In this embodiment, the connection portion 8 is held and fixed so as to hold the coil end by the holding portion 8A. A connection terminal (not shown) connected to the distal end is inserted to configure the connection terminal unit 10. On one surface of the connection housing 8 of the connection terminal unit 10, a through hole 8B is provided at a position corresponding to the conductive terminal pin 7A of the airtight terminal 7, and the conductive terminal pin 7A is inserted into the through hole 8B. As a result, the lead wires 9 are connected to the above-described connection terminals provided at the respective ends.
[0022]
The connection terminal unit 10 is arranged and fixed at a position facing the mounting hole 2D when the electric motor 3 is inserted and fixed into the bottomed cylindrical portion 2A. When the airtight terminal 7 is mounted on the mounting hole 2D at a predetermined position. The conductive terminal pin 7A is inserted into the through hole 8B, and the airtight terminal and the motor are electrically connected. Therefore, the operation of drawing out the lead wire at the time of connecting the hermetic terminal, which has been conventionally performed, becomes unnecessary, and the handling and the connection operation are facilitated. In addition, since the lead wire 9 does not need to be pulled out, it is not necessary to lengthen it wastefully, and the container does not need to have a large accommodation portion for the lead wire, so that the container can be downsized.
[0023]
In the connection terminal unit 10 of the electric compressor for a refrigerant described above, the connection housing 8 is fixed to the holding portion 8A so as to hold the coil end, but the holding and fixing method is not limited to this. Instead, it may be fixed on the coil end with, for example, a binding string, or a mounting hole may be provided in the motor stator, and a part of the connection terminal unit may be inserted and fixed there. If necessary, the housing and a protection device such as a thermoresponsive switch can be integrated.
[0024]
The connection structure is not limited to the structure in which the conductive terminal pins are directly inserted into the connection housing, but may be a structure in which predetermined terminals are connected to each other like a tab terminal and a receptacle, so that connection can be reliably performed. Needless to say, the shape of the connection housing is not limited to the embodiment as long as electrical insulation with necessary parts such as coil ends can be obtained.
[0025]
Further, the present invention can be used, for example, in a fully-sealed electric compressor. This example will be described with reference to FIG. FIG. 3 shows a state in which one of the containers of the electric compressor is not fixed for explanation. The hermetic container of the electric compressor 21 includes, as its components, an iron cylindrical portion 22A and a suction end container 22B and a discharge end container 22C which are attached to openings on both sides thereof, respectively. The respective components are fixed by welding. It is a closed container. An electric motor 23 and a compressor 24 are fixed in this closed container in the same manner as in the above-described example. In addition, a sealed terminal 25 for supplying electric power to the sealed container is hermetically fixed in advance to a through hole provided in the container, in this embodiment, the suction end container 22B by welding.
[0026]
A connection terminal unit 26 is fixed on the coil end 23A of the electric motor 23. When the suction end container 22B is mounted, the sealing terminal 25 is attached to a predetermined position opposed to the connection terminal unit 26 so as to be attached. Both are electrically connected. After that, the peripheral edge of the suction end container 22B is welded to the cylindrical portion 22A to form a closed container.
[0027]
The connection terminal unit 26 has, for example, a shape as shown in FIG. Each connection terminal unit 26 is configured by arranging a terminal 28A of a lead wire 28 connected to an electric motor winding on an electrically insulating connection housing 27. The connection housing 27 may house the terminal 28A inside. Instead, it is arranged in the groove-shaped storage section 27A. Each terminal is electrically insulated by a partition provided between the grooves. In this embodiment, mounting legs 27B are provided on the connection housing 27, and are fixed so as to sandwich the coil end of the electric motor.
[0028]
In this embodiment, the sealed terminal 25 is fixed to the suction end container 22B, which is a component of the container, in advance, and the suction end container 23B is attached to the corresponding cylindrical portion 22A in a predetermined positional relationship. Thus, the sealed terminal 25 and the terminal 28A of the connection terminal unit 26 are connected. Therefore, the connection operation can be simplified as compared with the conventional connection method. In the connection terminal unit 26 of this embodiment, the terminal holding portion is separated from the coil end 23A because the distance between the sealed terminal 25 and the coil end 23A is large due to the bearing 23B of the electric motor. The reason why the terminal holding portion is slightly offset from the coil end is to separate the terminal holding portion from the welding portion so as not to be affected by heat when welding the cylindrical portion 22A of the container and the suction end container 22B. Therefore, when the distance between the motor and the sealed terminal is short, the connection terminal unit can of course be miniaturized, and when the welding position is far from the connection terminal unit or when there is sufficient heat resistance, or, for example, the above-described example. When the container is mechanically fixed as in the above, it is not always necessary to offset the container.
[0029]
In each of the above-described embodiments, the connection terminal unit has been described as an example disposed on the electric motor.However, the method of fixing the connection terminal unit in the container is not limited to this as long as it is a position other than the sealed terminal. For example, the connection terminal unit may be fixed to the holding portion provided on the inner wall of the container, or may be fixed to a structure such as a bearing of an electric motor. In addition, as a work process, in addition to attaching and connecting the sealed terminal to the container in which the motor is fixed in advance to the container as described above, for example, inserting the motor in the container in which the sealed terminal is fixed in advance and fixing the motor to the motor The connection terminal unit that is mounted and fixed may be connected to the sealed terminal.
[0030]
In addition, as an example of the electric compressor, a case where a sealed terminal is provided on an end surface of a cylindrical container has been described. In some cases. Even in such a case, it is needless to say that, by fixing the connection terminal unit at a position corresponding to the sealed terminal mounting position, electrical connection can be made when the sealed terminal is mounted.
[0031]
【The invention's effect】
According to the electric compressor for a refrigerant of the present invention, the connection between the electric motor and the sealed terminal is simplified by fixing the connection with the electric motor winding at a predetermined position in the container as a connection terminal unit, Connection work can be automated. In addition, the connection operation can be easily and reliably performed even in a limited space in which it is difficult to route the electric wires.
[0032]
Further, by arranging the connection terminal unit in the electric motor, the connection terminal unit can be easily fixed in the container. In particular, the connection terminal unit can be arranged at a predetermined position even in a case where one of the containers is almost closed. .
[Brief description of the drawings]
FIG. 1 is a sectional view showing an embodiment of an electric compressor for refrigerant of the present invention. FIG. 2 is a perspective view for explaining attachment of a connection terminal unit used in the electric compressor for refrigerant of FIG. 3 is a sectional view showing another embodiment of the electric compressor for refrigerant of the present invention. FIG. 4 is a perspective view showing a connection terminal unit used in the electric compressor for refrigerant of FIG. 3; FIG. 6 is a cross-sectional view illustrating an example of an electric compressor. FIG. 6 is a partially enlarged view for explaining a connection operation of a sealed terminal in the electric compressor for refrigerant in FIG. 5. FIG. 7 is a sealed terminal in the electric compressor for refrigerant in FIG. Enlarged view to explain the connection work
1, 21: Electric compressor for refrigerant 2: Closed vessel 3, 23: Electric motor 4, 24: Compressor 7, 25: Closed terminal 8, 27: Connection housing 9, 28: Lead wire 10, 26: Connection terminal unit 28A: Terminal

Claims (4)

Having an electric motor and a compressor in a closed container,
In an electric compressor for a refrigerant in which electric power is supplied from a power supply outside the container to the electric motor via a sealed terminal attached to the container,
A connection terminal unit having a terminal electrically connected to the motor winding is fixed in the container and at a position other than the sealed terminal,
The electric compressor for a refrigerant, wherein the hermetically sealed terminal is air-tightly mounted and fixed at a predetermined position of the container so as to be electrically connectable to a terminal of the connection terminal unit fixed at the position in advance. The container has an opening for airtight terminal attachment,
The electric compressor for a refrigerant according to claim 1, wherein the connection terminal unit is fixed to face the opening. The sealed terminal is fixed in advance to the parts constituting the container,
2. The electric compressor for a refrigerant according to claim 1, wherein the container component is attached to a corresponding component to form a closed container, whereby the closed terminal and the terminal of the connection terminal unit are electrically connected. The electric compressor for a refrigerant according to any one of claims 1 to 3, wherein the connection terminal unit is disposed on the electric motor.

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