JP2008202565A - Electric compressor with built-in inverter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric compressor with a built-in inverter in which the filled resin amount of the structure of the resin-coated part of a motor drive circuit is remarkably reduced, the overall weight of which is reduced, and which is manufacturable at low cost. <P>SOLUTION: In this electric compressor with a built-in inverter, a motor is incorporated and the motor drive circuit having the inverter is installed in a storage space surrounded by the housing of the compressor. At least a part of electric parts including the motor drive circuit is coated with a resin placed in the storage space in an assembly completion state. The shape of the filled resin is defined in the storage space by a tool used in placing the resin and demarcating the space for resin filling. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an inverter-integrated electric compressor in which a motor drive circuit including an inverter is assembled in a compressor. In particular, the resin filling for insulating and protecting the motor drive circuit can be suppressed to a minimum required resin amount. The present invention relates to an inverter-integrated electric compressor that can be reduced in weight and cost as a whole.

  As a structure of an electric compressor including a motor drive circuit including an inverter or the like, a structure in which the motor drive circuit is covered with an insulating resin mold material and embedded in the resin mold material is known (for example, Patent Document 1).

In addition, the power semiconductor module placed between the upper lid and the compressor housing (low pressure side in the housing) is covered and embedded by pouring insulating synthetic resin, etc., in a heated flow state. The structure is also known (for example, Patent Document 2). In the structure described in Patent Document 2, the entire chamber that houses electrical components such as a power semiconductor module is filled with a resin mold material.
JP 2002-70743 A Japanese Patent Laid-Open No. 4-80554

  However, in the conventional structure as described above, since the resin is filled substantially over the entire chamber for accommodating the motor drive circuit and the like, and the motor drive circuit and the like are completely embedded, the amount of filled resin, The amount of resin used is increased, and accordingly, the weight reduction and cost reduction of the electric compressor as a whole are hindered. In particular, in an electric compressor used for a vehicle air conditioner or the like, it is required to reduce the weight and cost as much as possible.

  Therefore, in view of the problems and requirements of such conventional electric compressors, the object of the present invention is to reduce the amount of filled resin about the resin coating portion structure such as a motor drive circuit, and to reduce the weight of the compressor as a whole. An object is to provide an inverter-integrated electric compressor capable of reducing the cost.

  In order to solve the above problems, an inverter-integrated electric compressor according to the present invention includes a motor and an inverter-integrated electric motor in which a motor drive circuit including the inverter is provided in a housing space surrounded by the compressor housing. In the compressor, at least a part of the electrical components including the motor drive circuit is covered with the resin filled in the housing space in the assembled state, and the shape of the filling resin is in the housing space. In the above, it is defined by a jig used for filling a resin and defining a resin filling space.

  That is, in the conventional structure as described above, since the resin is filled substantially over the entire chamber for accommodating the motor drive circuit and the like, the resin is applied to a portion such as the inner wall of the accommodation chamber that does not require resin coating. In the structure according to the present invention, a jig for defining a resin filling space is arranged in the housing space when the resin is filled into the housing space. This jig is arranged to define a resin filling space for a target part that requires resin coating. Basically, a resin filling space is provided for a target part that does not require resin coating. Not defined. Therefore, for target parts that do not require resin coating, it is as if the conventional resin-filled form is removed, and the amount of resin used and the amount of resin used are reduced accordingly, reducing weight and cost. It becomes possible. On the other hand, for a target portion that requires resin coating, resin coating is reliably performed at a predetermined resin thickness by filling the resin into the resin filling space defined in a predetermined shape. .

  Thus, in the inverter-integrated electric compressor according to the present invention, resin filling is performed in a state after completion of predetermined assembly. If a lid member is provided to protect the interior parts with respect to the housing space, the lid member is removed, a jig is inserted, the jig is removed after completion of resin filling, and then the lid member is attached. . Removal of the jig after completion of resin filling can be performed very easily.

  In such an inverter-integrated electric compressor according to the present invention, the jig defines the resin filling space with respect to at least a part of the electric component including the motor drive circuit, and defines the housing space. A form in which the resin filling space is not defined can be taken for at least a part of the compressor housing formed. Since at least a part of the compressor housing, particularly the inner surface of the housing that defines the housing space, has many portions that do not require resin coating, the resin filling space should not be defined for such portions. The resin is not filled there. As a result, weight reduction and cost reduction can be achieved more efficiently.

  Further, the jig forms the resin filling space for at least a part of the electric parts including the motor drive circuit, and does not define the resin filling space for at least another part. Can also be taken. Among the electric parts arranged in plural, those that do not require resin coating, or at least the top part etc. are already covered with their own cover etc., and no further resin coating is required for that part If there is something, etc., the resin coating should be avoided as much as possible on the part where the resin coating is unnecessary. This achieves further reduction in the amount of filled resin, weight reduction, and cost reduction.

  The resin filling space may be defined so as to span at least some of the electrical components. As a result, in particular, in an area where the electrical components in the accommodation space are small and the electrical components are close to each other, it is possible to perform integral resin filling so as to span between the electrical components. Each electrical component can be fixed with the filling resin in a predetermined form without adversely affecting the mechanical connection or the like.

  In such an inverter-integrated electric compressor according to the present invention, particularly when the fluid to be compressed is a refrigerant, at least a part of the electric components including the motor drive circuit can exchange heat with the suction refrigerant that is the fluid to be compressed. Preferably, the compressor housing is provided. That is, it is preferable that a motor drive circuit is provided in or near the compressor housing located in the refrigerant suction path, and is configured to be able to exchange heat with the suction refrigerant side at that position. With this configuration, it is possible to automatically and appropriately cool an inverter that easily generates heat, maintain the predetermined performance of the motor drive circuit, and eliminate the need to provide a separate cooling device or the like, thereby simplifying the structure. it can.

  The resin filling is preferably performed by filling the resin filling space with a liquid resin material. By using the liquid resin material, the injection resin is filled over the entire necessary area in the resin filling space. It can be easily and quickly distributed, and a predetermined resin filling operation is facilitated. When this liquid resin material is used, the liquid resin material is cast into the resin filling space, and a predetermined resin coating is applied to the required target part by coating or the like in the course of casting. Is possible.

  In the present invention, it is also preferable that at least a part of the electric component including the motor drive circuit is filled with the resin in a preheated state after being heated. In this case, since the fluidity of the resin material is improved corresponding to the remaining heat, if this method is adopted when it is desired to obtain sufficient resin filling even in a fine space of the resin filling space. Good.

  In the present invention, a structure in which the jig itself is configured to be heatable (for example, a structure in which the jig includes a heat source) can be employed. In such a configuration, particularly when the filling resin is a thermosetting resin, the curing time can be shortened by setting the temperature of the jig to be equal to or higher than the curing temperature of the thermosetting resin.

  As the resin material used for resin filling, a thermosetting resin, for example, a thermosetting resin such as urethane or epoxy is preferable. If it is a thermosetting resin, even if an inverter etc. generate | occur | produces some heat after predetermined hardening, sufficiently high heat resistance and also durability can be maintained.

  The thickness of the filling resin (filling resin layer) is preferably 1 mm or more. By being 1 mm or more, it becomes possible to ensure desired insulation performance and protection performance. The thicker one is not particularly limited, but if it becomes too thick, there is a possibility that the same problem as the conventional completely embedded form may occur. Therefore, the upper limit of the thickness is limited to about 8 mm, preferably 6 mm or less. It is preferable.

  According to the electric compressor integrated with an inverter according to the present invention, in an assembled state, by filling the resin into the resin filling space defined by the jig arranged in the accommodation space, the required part is obtained. However, the resin coating can be performed with the minimum amount of resin required, and the amount of resin used and the amount of resin used can be greatly reduced compared to the conventional structure, reducing the overall weight and cost of the compressor. become.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows an inverter-integrated electric compressor 1 according to an embodiment of the present invention, and shows an example in which the present invention is applied to a scroll-type electric compressor. In FIG. 1, reference numeral 2 denotes a compression mechanism including a fixed scroll 3 and a movable scroll 4. The movable scroll 4 is turned with respect to the fixed scroll 3 in a state in which the rotation is prevented via the ball coupling 5. A motor 7 is incorporated in the compressor housing (center housing) 6, and the main shaft 8 (rotary shaft) is rotationally driven by the built-in motor 7. The rotational motion of the main shaft 8 is converted into the turning motion of the movable scroll 4 through the eccentric pin 9 disposed on one end side of the main shaft 8 and the eccentric bush 10 rotatably engaged thereto. ing. In this embodiment, a suction port 11 for sucking refrigerant as a fluid to be compressed is provided in the compressor housing (front housing) 12, and the sucked refrigerant is guided to the compression mechanism 2 through the motor 7 arrangement portion. The refrigerant compressed by the compression mechanism 2 is sent to the external circuit through the discharge port 13, the discharge chamber 14, and the discharge port 16 provided in the compressor housing (rear housing) 15.

  A housing space 20 is formed by being surrounded by the extending portion of the compressor housing 12 (front housing), and a motor drive circuit 21 is provided in the housing space 20. More specifically, the motor drive circuit 21 is provided in the housing space 20 on the outer surface side of the partition wall 22 with the refrigerant suction path side formed in the compressor housing 12. The motor drive circuit 21 supplies power to the motor 7 via a sealed terminal 23 (an output terminal of the motor drive circuit 21) attached through the partition wall 22 and a lead wire 24. The path side and the motor drive circuit 21 installation side are sealed. By providing the motor drive circuit 21 on the outer surface side of the partition wall 22, at least a part of the electrical components including the motor drive circuit 21 can exchange heat with the suction refrigerant via the partition wall 22. The cooling is possible.

  The motor drive circuit 21 includes an IPM (Intelligent Power Module) 25 having an inverter function and a control circuit 26, and an electrical component such as a capacitor 27 is provided separately or integrally therewith. The motor drive circuit 21 is connected to an external power source (not shown) via a connector 28 as an input terminal. The opening side to the outside of the compressor housing 12 on which the electric parts including the motor drive circuit 21 are mounted is covered in a state of being sealed with a lid member 29, and these electric parts are protected by the lid member 29. .

  The electric components such as the motor drive circuit 21 and the capacitor 27 are covered with a predetermined thickness (for example, with a thickness of 1 mm or more) with a thermosetting resin such as urethane or epoxy filled in the assembled state. . This resin filling is performed as follows.

  With the lid member 29 removed, a jig 31 having a predetermined shape used at the time of resin filling is inserted into the accommodating space 20, and a resin filling space 32 is defined by the jig 31 arranged at a predetermined position. . The resin filling space 32 is defined with a predetermined gap corresponding to the thickness of the filling resin with respect to an internal electrical component or the like. In this resin filling space 32, for example, resin filling 33 (for example, injection of liquid resin) is performed from one side, and after filling in the resin filling space 32, surplus resin discharge 34 is performed from the other side, After the resin is cured, the shape of the filling resin substantially corresponding to the shape of the resin filling space 32 is defined. Therefore, compared to the case where the resin is filled throughout the accommodation space 20, the amount of the filled resin and the amount of the used resin are greatly reduced.

  The jig 31 has a resin filling space 32 for at least a part (for example, the part 35) of the inner surface of the compressor housing 12 that defines the housing space 20, for example, a part that does not require resin coating. Is not defined. Accordingly, the resin coating is not performed on the portion 35, and the amount of the filled resin and the amount of the used resin are further reduced accordingly.

  The jig 31 defines the resin filling space 32 as described above with respect to at least a part of the electric parts including the motor drive circuit 21, and the resin filling space 32 with respect to at least another part. It is also possible to take a form that does not define For example, as shown in the drawing, a gap (that is, a resin filling space 32) is not formed between the part 36 and an internal electrical part (an electrical part having a head that does not require resin coating), and the jig 31 Is arranged in a state of being substantially in contact with the electrical component. In this way, the resin filling space 32 is not locally defined for a portion that does not require resin coating, and the resin filling is substantially made unnecessary for the portion, so that the amount of filled resin and the amount of resin used can be reduced. Further reduction is achieved, and a minimum amount of resin is required. By reducing the amount of resin in this way, weight reduction and cost reduction can be achieved as a whole compressor.

  Further, in a region where the electrical components such as the portion 37 shown in the figure have a small interval between the electrical components and are close to each other, the resin filling space 32 is formed so as to straddle between the electrical components. It becomes possible to perform integral resin filling across the parts. In this configuration, the electrical components adjacent to each other are not large in thickness, but are fixed to the integrally formed filling resin portion in the arrangement form as it is, and thus adversely affect the electrical connection and the like. In this way, each electrical component is held in a desired predetermined arrangement.

  The lid member 29 may be attached after completion of the predetermined resin filling. In addition, at the time of resin filling, as described above, it is possible to preheat the electrical components and the like under the preheated state, and to control the heating of the jig 31 itself. In this way, the fluidity of the resin material is improved corresponding to the amount of remaining heat, so that sufficient resin filling can be performed even in a particularly fine space of the resin filling space 32.

  The resin-filled structure using the jig according to the present invention can be applied to any inverter-integrated electric compressor, and in particular, a compression used for a vehicle air conditioner that requires weight reduction and cost reduction of the entire compressor. It is suitable for the machine.

1 is a schematic longitudinal sectional view of an inverter-integrated electric compressor according to an embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Inverter integrated electric compressor 2 Compression mechanism 3 Fixed scroll 4 Movable scroll 5 Ball coupling 6 Compressor housing (center housing)
7 Motor 8 Main shaft 9 Eccentric pin 10 Eccentric bush 11 Suction port 12 Compressor housing (front housing)
13 Discharge hole 14 Discharge chamber 15 Compressor housing (rear housing)
16 Discharge port 20 Accommodating space 21 Motor drive circuit 22 Partition wall 23 Sealed terminal 24 Lead wire 25 IPM
26 Control circuit 27 Capacitor 28 Connector 29 Cover member 31 Jig 32 Resin filling space 33 Resin filling 34 Excess resin discharge 35, 36, 37

Claims (10)

  In an inverter-integrated electric compressor in which a motor is incorporated and a motor drive circuit including an inverter is provided in a housing space surrounded by a compressor housing, at least a part of electrical components including the motor drive circuit is in an assembled state And the shape of the filling resin is defined by a jig that defines the resin filling space used when filling the resin in the housing space. An inverter-integrated electric compressor characterized by that.   The jig defines the resin filling space with respect to at least a part of an electric component including the motor drive circuit, and the jig with respect to at least a part of the compressor housing that defines the housing space. The inverter-integrated electric compressor according to claim 1, wherein the resin-filling space is not defined.   The jig defines the resin filling space for at least a part of an electrical component including the motor drive circuit, and does not define the resin filling space for at least another part. Item 3. The inverter-integrated electric compressor according to Item 1 or 2.   The inverter-integrated electric compressor according to any one of claims 1 to 3, wherein the resin filling space is defined so as to span at least some of the electric components.   The inverter integrated type according to any one of claims 1 to 4, wherein at least a part of an electric component including the motor drive circuit is provided in the housing space so as to be able to exchange heat with a suction refrigerant that is a fluid to be compressed. Electric compressor.   The inverter-integrated electric compressor according to any one of claims 1 to 5, wherein the resin filling is performed by filling a liquid resin material into the resin filling space.   The inverter-integrated electric compressor according to any one of claims 1 to 6, wherein the resin filling is performed in a preheated state after at least a part of electric parts including the motor driving circuit is heated.   The inverter-integrated electric compressor according to claim 1, wherein the jig itself is configured to be heatable.   The inverter-integrated electric compressor according to claim 1, wherein the resin material is made of a thermosetting resin.   The inverter-integrated electric compressor according to claim 1, wherein a thickness of the filling resin is 1 mm or more.

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