JP2004308445A - Electric compressor - Google Patents

Electric compressor Download PDF

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Publication number
JP2004308445A
JP2004308445A JP2003099437A JP2003099437A JP2004308445A JP 2004308445 A JP2004308445 A JP 2004308445A JP 2003099437 A JP2003099437 A JP 2003099437A JP 2003099437 A JP2003099437 A JP 2003099437A JP 2004308445 A JP2004308445 A JP 2004308445A
Authority
JP
Japan
Prior art keywords
motor
circuit board
output terminal
drive circuit
input terminal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
JP2003099437A
Other languages
Japanese (ja)
Inventor
Takeshi Takemoto
剛 竹本
Original Assignee
Denso Corp
株式会社デンソー
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Denso Corp, 株式会社デンソー filed Critical Denso Corp
Priority to JP2003099437A priority Critical patent/JP2004308445A/en
Publication of JP2004308445A publication Critical patent/JP2004308445A/en
Application status is Withdrawn legal-status Critical

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Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K5/00Casings; Enclosures; Supports
    • H02K5/04Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/22Auxiliary parts of casings not covered by groups H02K5/06-H02K5/20, e.g. shaped to form connection boxes or terminal boxes
    • H02K5/225Terminal boxes or connection arrangements
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B35/00Piston pumps characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for
    • F04B35/04Piston pumps characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being electric
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K11/00Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/30Structural association with control circuits or drive circuits
    • H02K11/33Drive circuits, e.g. power electronics
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K7/00Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/14Structural association with mechanical loads, e.g. with hand-held machine tools or fans

Abstract

An electric compressor capable of simplifying a connection operation between an output terminal on a motor drive circuit side and an input terminal on a motor side.
An output terminal (137) of a circuit board (133) constituting a motor driving circuit board and an input terminal (124) penetrated in a motor housing (121) project outward from a fitting hole (137a) of the output terminal (137). The portions 124a are directly fitted and electrically connected. Therefore, since the output terminal 137 and the input terminal 124 can be directly connected without using a connecting means such as a lead wire, the connection work between the output terminal 137 and the input terminal 124 can be simplified.
[Selection diagram] FIG.

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a motor drive circuit-integrated electric compressor in which a motor drive circuit such as an inverter circuit that drives a motor and an electric motor that drives a compression mechanism that sucks and compresses a refrigerant are integrated with a motor. It is effective when applied to a compression refrigeration cycle.
[0002]
[Prior art]
As a conventional technique, there is an electric compressor disclosed in Patent Document 1 below. In this electric compressor, a housing that houses a motor drive circuit is provided on an outer surface of a motor housing that houses a motor that drives a compression mechanism. The housing is provided with an inverter output terminal from the motor drive circuit, and the motor housing is provided with a sealed terminal for inputting to the motor. The output terminal of the inverter and the sealed terminal of the input are connected by a lead wire.
[0003]
[Patent Document 1]
JP-A-2002-70743
[Problems to be solved by the invention]
However, in the conventional electric compressor described above, since the inverter output terminal and the input sealed terminal are connected by a lead wire, which is an electrical connection means, there is a problem in that the connection work between the terminals becomes complicated during manufacturing. is there.
[0005]
The present invention has been made in view of the above points, and an object of the present invention is to provide an electric compressor capable of simplifying a connection work between an output terminal on a motor drive circuit side and an input terminal on a motor side. And
[0006]
[Means for Solving the Problems]
In order to achieve the above object, in the invention described in claim 1,
An electric motor (120) for driving a compression mechanism (110) for sucking and compressing the refrigerant;
A motor housing (121) for housing a motor (120) therein and flowing a fluid therein;
A drive circuit board (130) provided outside the motor housing (121) and formed with a motor drive circuit for driving the motor (120);
An output terminal (137) provided on the drive circuit board (130) for outputting drive power of the motor (120);
An input terminal (124) for penetrating the motor housing (121) and for inputting drive power to the motor (120) while sealing the fluid;
The output terminal (137) and the input terminal (124) are directly fitted and electrically connected.
[0007]
According to this, the output terminal (137) and the input terminal (124) can be directly connected without using the connection means. Therefore, the connection work between the output terminal (137) and the input terminal (124) can be simplified.
[0008]
In the invention according to claim 2,
The input terminal (124) has a fitting protrusion (124a) protruding outside the motor housing (121).
The output terminal (137) has a fitting hole (137a) corresponding to the shape of the fitting protrusion (124a),
The fitting protrusion (124a) and the fitting hole (137a) are fitted so that the output terminal (137) and the input terminal (124) are electrically connected.
[0009]
According to this, by fitting the fitting projection (124a) of the input terminal (124) into the fitting hole (137a) of the output terminal (137), the output terminal (137) and the input terminal (124) are connected. Can be electrically connected.
[0010]
According to the third aspect of the present invention, the fitting protrusion (124a) and the fitting hole (137a) are both formed in a substantially columnar shape.
[0011]
According to this, the fitting projection (124a) and the fitting hole (137a) can be easily formed, and the fitting connection between the fitting projection (124a) and the fitting hole (137a) is also easy. .
[0012]
In the invention described in claim 4, the fitting protrusion (124a) and the fitting hole (137a) are both formed in a substantially columnar shape.
[0013]
According to this, the formation of the fitting protrusion (124a) and the fitting hole (137a) is easier, and the work of fitting and connecting the fitting protrusion (124a) and the fitting hole (137a) is easier. It is.
[0014]
Further, in the invention according to claim 5, the drive circuit board (133) has the conductor pattern (136) connected to the output terminal (137), and the output terminal (137) and the conductor pattern (136) are both connected. It is characterized by being formed by insert resin molding.
[0015]
According to this, when the resin drive circuit board (133) in which the conductor pattern (136) is insert-molded is formed, the output terminal (137) can be easily formed on the drive circuit board (133).
[0016]
Further, in the invention according to claim 6, a drive circuit board casing (131 a) made of resin which forms a space for accommodating the drive circuit board (130) therein is provided, and the drive circuit board (133) It is characterized in that it is integrally formed with the circuit board casing (131a).
[0017]
According to this, the drive circuit board casing (131a) can be formed simultaneously when the resin drive circuit board (133) in which the output terminal (137) and the conductor pattern (136) are insert-molded is formed. .
[0018]
In the invention described in claim 7, the fluid flowing inside the motor housing (121) is a suction refrigerant sucked by the compression mechanism (110).
[0019]
According to this, since the suction refrigerant has a relatively low temperature, the motor (120) can be cooled. Further, the input terminal (124) can prevent the suction refrigerant from leaking outside the motor housing (121).
[0020]
It should be noted that the reference numerals in parentheses attached to the respective means are examples showing the correspondence with specific means described in the embodiment described later.
[0021]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0022]
(1st Embodiment)
FIG. 1 is a schematic diagram of a vapor compression refrigeration cycle for a vehicle using a motor drive circuit-integrated electric compressor (hereinafter abbreviated as a compressor) 100 according to a first embodiment of the present invention. is there.
[0023]
Reference numeral 200 denotes a radiator (condenser) that cools the refrigerant discharged from the compressor 100, and 300 separates the refrigerant flowing out of the radiator 200 into a gas-phase refrigerant and a liquid-phase refrigerant, and discharges the liquid-phase refrigerant. And a receiver (gas-liquid separator) for storing excess refrigerant in the refrigeration cycle.
[0024]
Reference numeral 400 denotes an expansion valve that is a decompression unit that decompresses the liquid-phase refrigerant flowing out of the receiver 300. Reference numeral 500 denotes an evaporator that evaporates the refrigerant depressurized by the expansion valve 400. In this embodiment, the expansion valve 400 is used as the pressure reducing means. However, the present embodiment is not limited to this, and a fixed throttle or the like may be used as the pressure reducing means.
[0025]
Here, the structure of the compressor 100 will be described.
[0026]
As shown in FIG. 1, a compressor 100 includes a compression mechanism 110 (in this example, a scroll-type compression mechanism) that sucks and compresses a refrigerant, and an electric motor 120 (in this example, a brushless DC motor) that drives the compression mechanism 110. ), And a drive circuit board 130 on which an inverter circuit or the like which is a motor drive circuit for driving the motor 120 is formed.
[0027]
Reference numeral 111 denotes a compression mechanism housing made of an aluminum alloy for housing the compression mechanism 110, and reference numeral 121 denotes a motor housing made of an aluminum alloy for housing the motor 120. The housing of the compressor 100 is constituted by the compression mechanism housing 111 and the motor housing 121.
[0028]
As shown in FIG. 1, a suction port 123 connected to the refrigerant outlet side of the evaporator 500 is formed in the motor housing 121, and a radiator 200 is formed in the compression mechanism housing 111 as shown in FIG. A discharge port 112 connected to the refrigerant inlet side is formed. Reference numeral 131 denotes a drive circuit board casing that houses the drive circuit board 130.
[0029]
Incidentally, the scroll-type compression mechanism 110 expands or reduces the volume of the working chamber by orbiting the orbiting scroll with respect to the fixed scroll to suck and compress the refrigerant. The fixed scroll is a part of the compression mechanism housing 111. Also serves as.
[0030]
FIG. 2 is a side view showing a partial cross section of the compressor 100. 2, illustration of the motor 120 is omitted.
[0031]
As shown in FIG. 2, a metal casing 131 is disposed above the motor housing 121 in the figure. A drive circuit board 130 is provided in the casing 131. A bottom surface 122 inside the casing 131 (storage space for the drive circuit board 130) is an outer surface of the motor housing 121.
[0032]
The drive circuit board 130 includes a circuit board 132 on which an electric element 134 is mounted, and a circuit board 133 on which an electric element 135 is mounted, and is supported by a support portion 122 a erected from the bottom surface 122. The circuit board 132 is a so-called rigid printed board in which a conductor pattern or the like is formed on an insulating base made of epoxy resin or the like.
[0033]
On the other hand, the circuit board 133 is a molded board made of resin (in this example, made of polybutylene terephthalate), and has a busbar 136 which is a high-rigidity conductor forming a circuit pattern portion for a large current of a motor drive circuit and the like, The output terminal 137 of the motor drive circuit is insert-molded. The electric element 135 mounted on the circuit board 133 is a heating element that generates a relatively large amount of heat, and is arranged so as to contact the bottom surface 122.
[0034]
Reference numeral 124 denotes an input terminal provided in the motor housing 121. A lead wire 126 is connected to the input terminal 124 in the motor housing 121, and drive power of the motor 120 (see FIG. 1) input from the input terminal 124 is supplied to the motor 120 (see FIG. 1) via the lead wire 126. ).
[0035]
FIG. 3 is an enlarged schematic cross-sectional view of the portion A shown in FIG.
[0036]
As shown in FIG. 3, the input terminal 124 penetrated into the motor housing 121 is a cylindrical conductive member, and the motor housing 121 is filled with a seal filled between the motor housing 121 and the input terminal 124. It is supported via the material layer 124c. In this embodiment, a glass material is filled as a sealing material to form a sealing material layer 124c.
[0037]
The sealing material layer 124c electrically insulates the input terminal 124 from the motor housing 121 and forms a hermetically sealed structure so that a refrigerant flowing through the motor housing 121, which will be described later, does not leak out of the motor housing 121. ing. The above-mentioned lead wire 126 is connected to an inwardly protruding portion 124 b of the input terminal 124 protruding inside the motor housing 121. Further, an outwardly protruding portion 124a of the input terminal 124 protruding outside the motor housing 121 is fitted and connected to a fitting hole 137a of an output terminal 137 described later. The outwardly projecting portion 124a is a fitting projection in the present embodiment.
[0038]
Although three input terminals 124 are formed in this embodiment, only one input terminal 124 is shown, and the other input terminals are not shown.
[0039]
The output terminal 137 inserted into the circuit board 133 together with the bus bar 136 has a cylindrical shape, and has a fitting hole 137a for fitting the input terminal 124 inside. The fitting hole 137a is formed in a column shape (a cross section in the left-right direction in the figure is circular) corresponding to the shape of the outwardly protruding portion 124a of the input terminal 124.
[0040]
The input terminal 124 and the output terminal 137 are electrically connected by press-fitting the outwardly protruding portion 124 a of the input terminal 124 and the fitting hole 137 a of the output terminal 137, and the drive circuit board 130 120 is supplied with driving power.
[0041]
Here, the bus bar 136 inserted into the circuit board 133 is the conductor pattern in the present embodiment connected to the output terminal 137, and the circuit board 133 formed by insert-molding the output terminal 137 and the bus bar 136 together is It corresponds to a substantial drive circuit board in the present invention.
[0042]
Next, the operation of the compressor 100 based on the above configuration will be described.
[0043]
When the motor 120 of the compressor 100 is driven by power supply from the drive circuit board 130 via the output terminal 137 and the input terminal 124, the motor 120 drives the compression mechanism 110 connected to the motor 120, and supplies the refrigerant to the compression mechanism 110. Inhale. Along with this, a gaseous low-temperature refrigerant (suction refrigerant) flows in from the suction port 123. The refrigerant flowing from the suction port 123 cools the motor 120 while flowing through the motor housing 121, is then suction-compressed by the compression mechanism 110, becomes a high-temperature gaseous refrigerant, and is discharged from the discharge port 112. I have.
[0044]
A part of the suction refrigerant flowing from the suction port 123 toward the compression mechanism 110 by driving the compression mechanism 110 flows inside the motor housing 121 in FIG. The suction refrigerant absorbs heat from the electric element 135, which is a main heat source of the inverter circuit, via the motor housing 121, and cools the space in the casing 131 via the motor housing 121. Thereby, the drive circuit board 130 on which the inverter circuit and the like are formed is efficiently cooled.
[0045]
According to the above configuration and operation, the output terminal 137 and the input terminal 124 are electrically connected to each other by directly fitting the outwardly protruding portion 124a into the fitting hole 137a. Therefore, since the output terminal 137 and the input terminal 124 can be directly connected without using a connecting means such as a lead wire, the work of connecting the output terminal 137 and the input terminal 124 can be simplified.
[0046]
Further, the number of components of the compressor 100 can be reduced as compared with the case where the connection means is used. Further, since the output terminal 137 and the input terminal 124 are not separated from each other, the size of the compressor 100 can be reduced.
[0047]
Further, since the outwardly projecting portion 124a of the input terminal 124 and the fitting hole 137a of the output terminal 137 are both formed in a columnar shape, the outwardly projecting portion 124a and the fitting hole 137a can be easily formed. The fitting connection operation between the outwardly projecting portion 124a and the fitting hole 137a is also easy. Further, since the contact area between the outwardly protruding portion 124a and the fitting hole 137a is easily ensured, a reliable electrical connection between the input terminal 124 and the output terminal 137 is possible.
[0048]
In addition, the circuit board 133 is formed by insert resin molding of the output terminal 137 and the bus bar 136 connected thereto. Therefore, the output terminals 137 can be easily formed on the drive circuit board 130. In addition, unlike the case where the output terminal 137 is provided separately from the drive circuit board 130, the connection work between the output terminal 137 and the drive circuit board 130 becomes unnecessary, and the size of the compressor 100 is reduced. Can also contribute to
[0049]
(Second embodiment)
Next, a second embodiment will be described with reference to FIG. The second embodiment is different from the first embodiment in the configuration of the casing 131. The same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.
[0050]
As shown in FIG. 4, the casing 131 of the present embodiment is disposed so as to cover a box portion 131 a having a substantially rectangular cylindrical structure with large open upper and lower surfaces in the drawing and an opening on the upper surface side of the box portion 131 a in the drawing. And a cover 131b made of a metal plate. The box portion 131a is formed integrally with the circuit board 133 housed therein.
[0051]
According to the above configuration, the same effects as in the first embodiment can be obtained. In addition, when forming the circuit board 133, a part of the drive circuit board casing 131 can be formed at the same time. Further, since the circuit board 133 is supported by the box portion 131a of the casing 131, the number of assembling work steps can be further reduced.
[0052]
(Other embodiments)
In each of the above embodiments, the column-shaped outwardly projecting portion 124a of the input terminal 124 is fitted and connected into the cylindrical fitting hole 137a of the output terminal 137. Is not limited to this as long as they are directly fitted and connected.
[0053]
Both the outwardly projecting portion 124a and the fitting hole 137a may be formed in a prismatic shape. Further, the outwardly protruding portion 124a and the fitting hole 137a are not limited to a columnar shape, that is, a shape in which the same shape is extended in the press-fitting direction at the time of fitting, and may be formed in consideration of a locking state at the time of fitting. It may be one in which an enlarged diameter portion or the like is formed in the portion. Alternatively, a fitting hole may be formed in the input terminal 124 and the fitting protrusion formed in the output terminal 137 may be fitted and connected in the fitting hole.
[0054]
In the second embodiment, the circuit board 133 in which the bus bar 136 and the like are inserted and the box portion 131a of the casing 131 are integrally formed. However, the bus bar and the like are also inserted in the box portion 131a to form the drive circuit board. It may be used as a part.
[0055]
Further, in each of the above-described embodiments, the casing 131 is formed on the upper side surface of the motor housing 121 in FIG. 2 or FIG. 4, but is not limited to this position. For example, it may be formed on the end face of the motor housing 121 on the right side in FIG. 2 or FIG.
[0056]
Further, in each of the above embodiments, the fluid flowing through the motor housing 121 is the suction refrigerant, but is not limited thereto. For example, if cooling of the motor 120 and the drive circuit board 130 is unnecessary, it may be a discharged refrigerant.
[0057]
In each of the above embodiments, the drive circuit board 130 is provided in the space inside the casing 131. However, for the purpose of insulation and waterproofing, the space inside the casing 131 is potted by, for example, silicone gel. It doesn't matter.
[0058]
Further, in each of the above embodiments, the compression mechanism 110 is a scroll type, but is not limited thereto, and may be a vane type, a swash plate type variable capacity type, or the like. Further, the positions of the discharge port 112 and the suction port 123 are not limited to the positions in the above embodiments. When cooling of the motor 120 and the drive circuit board 130 is necessary, any structure may be used as long as the drawn refrigerant flows in the motor housing 121.
[0059]
Further, in each of the above embodiments, the motor 120 is a brushless DC motor. However, the present invention is not limited to this. Further, the motor drive circuit is of the inverter type, but is not limited to this, and may be one that drives a DC motor using, for example, a chopper method.
[Brief description of the drawings]
FIG. 1 is a schematic diagram of a vapor compression refrigeration cycle using an electric compressor according to a first embodiment of the present invention.
FIG. 2 is a schematic structural view of the electric compressor according to the first embodiment, and is a side view showing a partial cross section.
FIG. 3 is an enlarged schematic cross-sectional view of a portion A shown in FIG. 2;
FIG. 4 is a schematic structural view of an electric compressor according to a second embodiment, and is a side view showing a partial cross section.
[Explanation of symbols]
REFERENCE SIGNS LIST 100 electric compressor 110 compression mechanism 120 motor 121 motor housing 124 input terminal 124a outward projection (fitting projection)
124c Sealing material layer 130 Drive circuit board 131 Casing 131a Box (part of casing for drive circuit board)
132, 133 Circuit board 136 Bus bar (conductor pattern)
137 output terminal 137a fitting hole

Claims (7)

  1. An electric motor (120) for driving a compression mechanism (110) for sucking and compressing the refrigerant;
    A motor housing (121) that houses the motor (120) therein and circulates a fluid therein;
    A drive circuit board (130) provided outside the motor housing (121) and formed with a motor drive circuit for driving the motor (120);
    An output terminal (137) provided on the drive circuit board (130) for outputting drive power of the motor (120);
    An input terminal (124) inserted through the motor housing (121) to input the drive power to the motor (120) while sealing the fluid;
    The electric compressor wherein the output terminal (137) and the input terminal (124) are directly fitted and electrically connected.
  2. The input terminal (124) has a fitting protrusion (124a) protruding outside the motor housing (121),
    The output terminal (137) has a fitting hole (137a) corresponding to the shape of the fitting protrusion (124a),
    The fitting protrusion (124a) and the fitting hole (137a) are fitted so that the output terminal (137) and the input terminal (124) are electrically connected. The electric compressor according to claim 1.
  3. The electric compressor according to claim 2, wherein both the fitting protrusion (124a) and the fitting hole (137a) are formed in a substantially columnar shape.
  4. The electric compressor according to claim 2, wherein both the fitting protrusion (124a) and the fitting hole (137a) are formed in a substantially columnar shape.
  5. The drive circuit board (133) has a conductor pattern (136) connected to the output terminal (137), and is formed by insert resin molding of the output terminal (137) and the conductor pattern (136) together. The electric compressor according to any one of claims 1 to 4, wherein:
  6. A drive circuit board casing (131a) made of resin which forms a space for accommodating the drive circuit board (130) therein;
    The electric compressor according to claim 5, wherein the drive circuit board (133) and the drive circuit board casing (131a) are integrally formed.
  7. The electric compressor according to any one of claims 1 to 6, wherein the fluid is a refrigerant sucked by the compression mechanism (110).
JP2003099437A 2003-04-02 2003-04-02 Electric compressor Withdrawn JP2004308445A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2003099437A JP2004308445A (en) 2003-04-02 2003-04-02 Electric compressor

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Application Number Priority Date Filing Date Title
JP2003099437A JP2004308445A (en) 2003-04-02 2003-04-02 Electric compressor
US10/811,802 US20040197213A1 (en) 2003-04-02 2004-03-30 Motor-compressor
DE102004015826A DE102004015826A1 (en) 2003-04-02 2004-03-31 Motor-compressor

Publications (1)

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JP2004308445A true JP2004308445A (en) 2004-11-04

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US (1) US20040197213A1 (en)
JP (1) JP2004308445A (en)
DE (1) DE102004015826A1 (en)

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