JP2003222078A - Motor compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To restrain magnification in size and increment in weight in a motor compressor. <P>SOLUTION: Since an electric part 42 is formed between a virtual tangential plane S abutting with an outer barrel face 31a and the outer barrel face 31a and is accommodated in groove 32, waste thickness (dead space) can be effectively applied. Accordingly, the magnification in size and the increment in weight in the motor compressor 10 can be restrained. Furthermore, since a portion of the waste thickness vanish and thickness of a motor housing 31 can be thinned, the electric part 42 can be securely cooled by refrigerant of suction flowing into the motor housing 31. Accordingly, the electric part 42 need not be enlarged so as to increase radiating capacity of the electric part 42 and since the electric part 42 which is high in heat resisting temperature is unnecessary, reliability and durability of the electric part 40 is enhanced, while miniaturization and cost reduction in manufacture for the electric part 42 are realized. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric compressor in which a compressor, a motor and an electric circuit for driving the motor are integrated, and is effectively used for an electric compressor of a vapor compression refrigerator.

[0002]

2. Description of the Related Art As an electric compressor in which a compressor, a motor, and an electric circuit for driving the motor are integrated, the applicant of the present invention has proposed an outer cylinder of a motor housing formed in a substantially cylindrical shape. Invention in which a casing that houses a driving electric circuit is integrated on the surface side (Japanese Patent Application No. 2000-3700).
No. 73) has already been filed.

However, in the above application, as shown in FIG. 9, the drive electric circuit 40, that is, the bottom surface of the substantially cubic (hexahedral) casing 41 contacts the outer cylindrical surface 31a of the motor housing 31, that is, Since the casing 41 and the motor housing 31 are integrated, the outer cylindrical surface 31a
A portion (a portion shown by diagonal lines in FIG. 9) Ds formed between an imaginary tangent plane S in contact with the outer cylindrical surface becomes a dead space, and the portion Ds is effectively used. I can't. Therefore, the electric compressor is increased in size and weight.

In addition, since the thickness of the motor housing becomes thicker at the pad portion, that is, the portion Ds, a sufficient cooling capacity can be obtained when the drive electric circuit is cooled by the refrigerant flowing in the motor housing. There is a high possibility that you cannot do it.

For this reason, in order to increase the heat dissipation ability of the electric parts constituting the drive electric circuit, heat treatment such as enlarging the electric parts to increase the surface area thereof or using electric parts having a high heat resistance temperature is taken. Since it is necessary to do so, the driving electric circuit is increased in size and the manufacturing cost is increased.

The present invention has been made in view of the above points, and at least an object thereof is to suppress the size increase and the weight increase of an electric compressor.

[0007]

In order to achieve the above-mentioned object, the present invention provides a compression mechanism (20) for sucking and compressing a refrigerant, and an electric motor for driving the compression mechanism (20). A motor (30) having an electric motor (30) and an electric circuit (40) for driving the motor (30), the electric circuit (40) having a substantially cylindrical shape. Of the housing (31) on the outer cylinder surface (31a) side, and further, a part (42) of the electric component constituting the electric circuit (40) is in contact with the outer cylinder surface (31a). It is characterized in that it is installed in a portion (32) formed between the tangent plane (S) and the outer cylindrical surface (31a).

This makes it possible to effectively utilize the dead space (dead space) described in the section of "Prior Art and Problems to be Solved by the Invention", so that the electric compressor is prevented from increasing in size and weight. can do.

According to the second aspect of the invention, the compression mechanism (20) for sucking and compressing the refrigerant, the electric motor (30) for driving the compression mechanism (20), and the electric circuit (for driving the motor (30) ( 40) is an electric compressor in which the electric circuit (40) is integrated on the outer cylinder surface (31a) side of the housing (31) of the motor (30) formed in a substantially cylindrical shape. In addition, a part (42) of the electric component that constitutes the electric circuit (40) is formed between an imaginary tangent plane (S) contacting the outer cylindrical surface (31a) and the outer cylindrical surface (31a). It is characterized in that it is installed in a storage space (32) provided in a part thereof.

As a result, it is possible to effectively utilize the dead space (dead space) described in the section of "Prior Art and Problems to be Solved by the Invention", so that the electric compressor can be prevented from increasing in size and weight. can do.

According to the third aspect of the invention, the compression mechanism (20) for sucking and compressing the refrigerant, the electric motor (30) for driving the compression mechanism (20), and the electric circuit for driving the motor (30) ( 40) is an electric compressor in which the electric circuit (40) is integrated on the outer cylinder surface (31a) side of the housing (31) of the motor (30) formed in a substantially cylindrical shape. In addition, a part (42) of the electric component that constitutes the electric circuit (40) is formed between an imaginary tangent plane (S) contacting the outer cylindrical surface (31a) and the outer cylindrical surface (31a). It is characterized in that it is fixed to the outer cylindrical surface (31a) in the space (32).

This makes it possible to effectively utilize the dead space (dead space) described in the section of "Prior Art and Problems to be Solved by the Invention", thereby suppressing the increase in size and weight of the electric compressor. can do.

According to a fourth aspect of the present invention, the outer cylindrical surface is provided on the virtual tangential plane (S) side of the casing (41) that accommodates electric parts other than the part of the electric parts (42). A hole (41b) for communicating the (31a) side with the inside of the casing (41) is provided, and, for example, the electric component (4)
2) may be fixed to the casing (41).

According to the fifth aspect of the present invention, the part (42) of the electric component is seen from the axial direction of the housing (31).
It is characterized in that they are arranged to face each other at substantially symmetrical positions.

Thereby, for example, a wiring board such as a bus bar or a printed wiring to which the electric component (42) is connected is brought close to the housing (31), or the wiring board is moved to the housing (3
It can be fixed to 1).

Therefore, an electric component (4
Since the wiring board to which 2) is connected can be cooled reliably, the width and thickness of the wiring conductor in the wiring board can be reduced, and the wiring board can be downsized.

In the invention according to claim 6, the housing (31) is provided with a refrigerant inflow port (34), and the compression mechanism (20) is further provided with a housing (3).
1) It is characterized in that the refrigerant is sucked from the inside.

As a result, the extraneous portion disappears and the wall thickness of the housing (31) can be reduced, and the electric component (42) is reliably cooled by the refrigerant flowing in the housing (31). be able to.

Therefore, in order to increase the heat dissipation capability of the electric component (42), it is not necessary to upsize the electric component (42) and it is not necessary to use the electric component (42) having a high heat resistant temperature. It is possible to improve the reliability and durability of the electric circuit (40) while reducing the size of the electric circuit (40) and reducing the manufacturing cost.

The types of some electric components (42) are as follows:
According to the invention described in claim 7, IGBT, MOS-F
At least one of ET and a capacitor may be used.

Incidentally, the reference numerals in the parentheses of the above-mentioned respective means are examples showing the correspondence with the concrete means described in the embodiments described later.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION (First Embodiment)
FIG. 1 is a perspective view of an electric compressor 10 according to the present embodiment, in which the present invention is applied to an electric compressor of a vehicle air conditioner using a vapor compression refrigerator, and FIG. FIG. 3 is a side view (partially sectional view) of the machine 10, and FIG.
FIG. 4 is a sectional view taken along the line A, and FIG. 4 is an exploded perspective view showing a state in which a casing 41 that houses an electric circuit 40 described later is removed.

As shown in FIG. 1, the electric compressor 10 includes a scroll type compression mechanism 20 for sucking and compressing a refrigerant, a DC brushless type motor 30 for driving the compression mechanism 20, and an inverter circuit for driving the motor 30. The motor drive electric circuit 40 and the like are configured, and the compression mechanism 20 and the motor 30 are integrated coaxially and side by side in series.

The casing 41 for accommodating the electric circuit 40 is attached to the outer cylindrical surface 31a of the substantially cylindrical motor housing 31 accommodating the motor 30 with a bolt so as to be integrated with the compression mechanism 20 and the motor 30. Has been converted.
In this embodiment, the containers such as the motor housing 31 and the casing 41 are all made of aluminum alloy.

The electric compressor 10 has an electric circuit 40.
Is fixed to the crankcase of the traveling engine by bolts so that it is located on the opposite side of the traveling engine with the motor 30 interposed therebetween. In this example, the electric compressor 10 is assembled in the crankcase, but in an electric vehicle or a hybrid vehicle that uses an electric motor as a drive source,
It may be mounted on the vehicle body.

Further, as shown in FIGS. 3A and 3B, an electric circuit is formed in a portion formed between the outer cylindrical surface 31a and a virtual tangent plane S which is in contact with the outer cylindrical surface 31a. Grooves 32, which are a storage space for storing a part of the electric components constituting 40, are formed at substantially symmetrical positions when viewed in the axial direction of the motor housing 31.

In the present embodiment, among the electric parts constituting the electric circuit 40, for example, an IGBT or a MOS-FE is used.
An electric component 42 having a relatively large heat generation such as T and an aluminum electrolytic capacitor is housed in the groove 32. Therefore, as shown in FIG. 3, the electric components 42, which generate a relatively large amount of heat, are in a state of being opposed to each other at substantially symmetrical positions when viewed in the axial direction of the motor housing 31.

The casing 41 has a virtual tangent plane S.
It is located on the opposite side of the motor housing 31 with respect to and is fixed to a seat surface 33 (see FIG. 1) parallel to the imaginary tangent plane S, and the imaginary tangent plane S of the casing 41.
On the side, that is, the bottom plate 41a that contacts the seat surface 33,
The outer cylinder surface 31a side, that is, the hole portion 41b that allows the groove portion 32 and the inside of the casing 41 to communicate with each other is formed.

As shown in FIGS. 2 and 3, the electric component 42 is fixed to the bottom plate 41a so as to be hung from the casing 41 via a bracket 42a, or is attached integrally with the bottom plate 41a. 41d, the casing 41 is fixed to the motor housing 31 by arranging the bottom plate 41a on the seat surface 33 so as to insert the electric component 42 into the groove 32. Fix with screws. A gasket is arranged as a sealing means between the bottom plate 41a and the seat surface 33.

After fixing the bottom plate 41a to the seating surface 33, the groove 32 is filled with an insulating gel having a high thermal conductivity to keep the electric component 42 housed in the groove 32 in good heat conduction. At the same time, the casing cover 4 is attached to the casing 41 via sealing means such as packing and gasket.
Wear 1c.

Incidentally, in the present embodiment, when the electric component 42 accommodated in the groove 32 is a capacitor, the surface of the electric component 42 is coated with an insulating coating film having a high thermal conductivity, and the electric component 4 is formed.
2 (capacitor) is fixed to the bracket 42a, and the groove 3
The electric parts 42 housed in 2 are IGBTs and MOS-FETs.
In the case of a power element such as, the heat sink to which the power element is bonded is fixed to the mounting portion 42d with a screw, and
The groove 32 is filled with an insulating gel having a high thermal conductivity.

On the side opposite to the compression mechanism 20 of the axial end portion of the motor housing 31, as shown in FIG.
A refrigerant inflow port 34 is provided, and the compression mechanism 20 is provided.
Sucks the refrigerant from the inside of the motor housing 31 and discharges the compressed refrigerant from the discharge port 35.

Next, the function and effect of this embodiment will be described.

Since the electric component 42 is housed in the groove 32 which is formed between the imaginary tangent plane S which contacts the outer cylinder surface 31a and the outer cylinder surface 31a, the "conventional technique and the problem to be solved by the invention" is solved. It is possible to effectively utilize the dead meat (dead space) mentioned in the section of "." Therefore, the electric compressor 10
It is possible to suppress an increase in size and an increase in weight.

Further, since the useless portion disappears and the thickness of the motor housing 31 can be reduced, the electric component 42 can be surely cooled by the suction refrigerant flowing in the motor housing 31.

Therefore, it is not necessary to increase the size of the electric component 42 in order to increase the heat dissipation capability of the electric component 42.
Moreover, since it is not necessary to use the electric component 42 having a high heat resistant temperature, the reliability and durability of the electric circuit 40 can be improved while the electric circuit 40 is downsized and the manufacturing cost is reduced.

Further, since the electric components 42 such as power elements which generate a large amount of heat are arranged to face each other, a wiring board such as a bus bar or a printed wiring to which the electric components 42 are connected is brought close to the motor housing 31, or the wiring board is a motor. It can be fixed to the housing 31 via an insulating thin film. Therefore, the wiring board to which the electric component 42 through which a large current flows can be surely cooled, so that the width and thickness of the wiring conductor in the wiring board can be reduced, and the wiring board can be miniaturized. Can be planned.

(Second Embodiment) In the first embodiment, the electric component 42 is fixed to the casing 41, but in this embodiment, as shown in FIGS. 5 to 7, a virtual contact with the outer cylindrical surface 31a is made. The electric component 42 is housed in the space 32 formed between the tangent plane S and the outer cylindrical surface 31a, that is, the groove 32 in the first embodiment, and the electric component 42 is fixed to the outer cylindrical surface 31a of the motor housing 31. It was done. In addition,
A flat portion is formed on a portion of the outer cylindrical surface 31a where the electric component 42 is fixed in order to stabilize the sitting of the electric component 42.

Also in this embodiment, an insulating gel having a high thermal conductivity is filled around the electric component 42 so as to keep the heat dissipation good and to achieve a small size and mass production.

Incidentally, FIG. 5 is an exploded perspective view of the electric compressor 10 according to the present embodiment, in which the bottom plate 41a also serves as a wiring board, and the casing cover 41c includes the packing 4
Motor housing 31 together with wiring board 41a through 1d
It is fixed with screws and bolts.

FIG. 6 is a view on arrow A in FIG. 5, and FIG.
8 is a cross-sectional view corresponding to the same cross-section as FIG. 7, and since the electric component 42 on the left side of FIG. 7 is an aluminum electrolytic capacitor, an insulating coating film having high thermal conductivity is formed on the surface thereof as in the first embodiment. The electric component 42 on the left side of FIG. 7 is a power element, and thus is fixed to the outer cylindrical surface 31a via a heat sink to which the power element is bonded.

As described above, according to this embodiment, the electric component 42 is connected to the outer cylindrical surface 31 of the motor housing 31.
Since it is fixed to a, the heat of the electric component 42 can be more reliably transferred to the suction refrigerant, and the electric component 42 can be cooled reliably.

Further, in this embodiment, since the wiring board 41a is also fixed to the motor housing 31, the wiring board to which the electric parts 42 through which a large current flows can be surely cooled and the wiring board can be surely cooled. The size of 41a can be reduced.

FIG. 8 shows a modification of this embodiment.
In FIG. 8, power elements are arranged as the electric parts 42 in the spaces 32 on both sides of the paper.

(Other Embodiments) In the above-described embodiments, the present invention is applied to the vehicle air conditioner, but the application of the present invention is not limited to this, and may be applied to other refrigerators such as refrigerators. Can also be applied.

Further, although the scroll type compression mechanism 20 is adopted in the above-mentioned embodiment, the present invention is not limited to this, and other types of compression mechanisms such as a rotary type and a rolling piston may be used. .

[Brief description of drawings]

FIG. 1 is a perspective view of an electric compressor according to a first embodiment of the present invention.

FIG. 2 is a side view (partially sectional view) of the electric compressor according to the first embodiment of the present invention.

3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is an exploded perspective view of the electric compressor according to the first embodiment of the present invention.

FIG. 5 is an exploded perspective view of an electric compressor according to a second embodiment of the present invention.

6 is a view on arrow A of FIG.

7 is a cross-sectional view showing a modified example in a cross section corresponding to the cross section AA of FIG.

FIG. 8 is a sectional view showing a modified example of the electric compressor according to the second embodiment of the present invention.

FIG. 9 is an explanatory diagram for explaining a problem of the conventional technique.

[Explanation of symbols]

30 ... Motor, 31 ... Motor housing, 31a ... Outer cylindrical surface, 32 ... Groove part, 40 ... Electric circuit, 41 ... Casing,
42 ... Electric parts (IGBT, MOS-FET, aluminum electrolytic capacitor, etc.).

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kenji Funabashi             1-1, Showa-cho, Kariya city, Aichi stock market             Inside the company DENSO (72) Inventor Yuji Takeo             1-1, Showa-cho, Kariya city, Aichi stock market             Inside the company DENSO F-term (reference) 3H003 AA05 AB05 AC03 BE09 CD00                       CF01                 3H029 AA02 AA15 AB03 BB32 CC27                 5H611 AA09 BB08 TT01 UA04 UB00

Claims (7)

[Claims] 1. A compression mechanism (20) for sucking and compressing a refrigerant,
An electric motor (3) for driving the compression mechanism (20)
0) and an electric circuit (4) for driving the motor (30)
0) is an integrated electric compressor, wherein the electric circuit (40) has an outer cylindrical surface (31a) of a housing (31) of the motor (30) formed in a substantially cylindrical shape.
Further, a part (42) of the electric component constituting the electric circuit (40) is integrated with the side, and a virtual tangent plane (S) contacting the outer cylinder surface (31a) and the outer cylinder surface. An electric compressor, which is installed in a portion (32) formed between (31a). 2. A compression mechanism (20) for sucking and compressing a refrigerant,
An electric motor (3) for driving the compression mechanism (20)
0) and an electric circuit (4) for driving the motor (30)
0) is an integrated electric compressor, wherein the electric circuit (40) is an outer cylinder surface (31a) of a housing (31) of the motor (30) formed in a substantially cylindrical shape.
Further, a part (42) of the electric component constituting the electric circuit (40) is connected to the outer cylindrical surface (31a) and a virtual tangent plane (S) contacting the outer cylindrical surface (31a). An electric compressor which is installed in a storage space (32) provided in a portion formed between (31a). 3. A compression mechanism (20) for sucking and compressing a refrigerant,
An electric motor (3) for driving the compression mechanism (20)
0) and an electric circuit (4) for driving the motor (30)
0) is an integrated electric compressor, wherein the electric circuit (40) is an outer cylinder surface (31a) of a housing (31) of the motor (30) formed in a substantially cylindrical shape.
Further, a part (42) of the electric component constituting the electric circuit (40) is integrated with the side, and a virtual tangent plane (S) contacting the outer cylinder surface (31a) and the outer cylinder surface. An electric compressor which is fixed to the outer cylindrical surface (31a) in a space (32) formed between the electric compressor and (31a). 4. A casing (41) on the opposite side of the housing (31) with the virtual tangent plane (S) interposed between the electric components (42) other than the part of the electric components (42).
Is provided, and the virtual tangent plane (S) of the casing (41) is provided.
The outer cylinder surface (31a) side and the casing (4
The electric compressor according to any one of claims 1 to 3, further comprising a hole (41b) communicating with the inside of 1). 5. A part (42) of the electric component is arranged so as to face each other at a substantially symmetrical position when viewed from the axial direction of the housing (31). The electric compressor according to claim 1. 6. The housing (31) is provided with a refrigerant inflow port (34), and the compression mechanism (20) is provided with the housing (3).
The electric compressor according to any one of claims 1 to 5, wherein the refrigerant is sucked from inside 1). 7. The type of said some electrical components (42) is
7. The electric compressor according to claim 1, wherein the electric compressor is at least one of an IGBT, a MOS-FET, and a capacitor.