JP5308722B2 - Electric compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric compressor ensuring communication of a space in a drive circuit storage chamber with a vent hole without requiring a temporary cylindrical member. <P>SOLUTION: An extending portion 13e surrounding the vent hole 13d and extending toward the side of a closing plate is formed inside of a third housing 13 with the vent hole 13d positioned. When a mold material 44 is poured into the drive circuit storage chamber 13b, therefore, the mold material 44 is prevented from entering the vent hole 13d, and the vent hole 13d easily communicates with the space in the drive circuit storage chamber 13b. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to an electric compressor provided with a motor drive circuit in a housing.

  Conventionally, this type of electric compressor includes a compressor that compresses refrigerant sucked into a housing, a motor that drives the compressor, and a motor drive circuit that drives the motor. What provided the drive circuit storage chamber which accommodates is known. An insulating mold material such as epoxy resin or silicon resin is injected into the drive circuit storage chamber in order to protect the motor drive circuit to be stored from vibration and moisture (see, for example, Patent Document 1).

In the electric compressor, one end surface of the drive circuit storage chamber is provided so as to be openable and closable by a closing plate, and the mold material is injected into the drive circuit storage chamber with the one end surface of the drive circuit storage chamber opened upward. Yes. In this case, since a space is generated between the mold material in the drive circuit housing chamber and the closing plate, a ventilation valve is attached to the housing in order to keep the pressure in the drive circuit housing chamber constant.
JP 2002-077043 A

  In the electric compressor, when the molding material is injected into the drive circuit housing chamber, it is necessary to connect the ventilation hole provided in the housing and the space in the drive circuit housing chamber. In this case, a communication path is formed between the space in the drive circuit housing chamber and the vent hole by injecting the molding material with the temporary cylindrical member attached to the vent hole from the drive circuit housing chamber side. For this reason, the process of attaching and removing the cylindrical member before and after the injection of the molding material occurs, and the manufacturing cost increases. Further, when a mold material with high fluidity is used, the mold material enters from the gap between the cylindrical members, and there is a possibility that the communication between the space in the drive circuit housing chamber and the vent hole cannot be secured.

  An object of the present invention is to provide an electric compressor capable of ensuring communication between a space in a drive circuit housing chamber and a vent without requiring a temporary cylindrical member.

  In order to achieve the above object, the present invention includes a compression unit that compresses the refrigerant sucked into the housing, a motor that drives the compression unit, and a motor drive circuit that drives the motor, and the motor drive circuit is provided in the housing. In the electric compressor provided with the drive circuit housing chamber for housing, one end surface of the drive circuit housing chamber is provided so as to be openable and closable by a closing plate, and a ventilation valve for maintaining a constant pressure in the drive circuit housing chamber is attached to the housing. A vent hole is provided, and an extending portion that surrounds the vent hole and extends toward the closing plate is provided inside the housing where the vent hole is located.

  As a result, the vent hole side excluding the closing plate side in the drive circuit housing chamber is partitioned from the rest, so that when the mold material is injected into the drive circuit housing chamber, the mold material is prevented from entering the vent hole side. The

The vent hole may be provided at the distal end of the extension portion, and may be provided at a predetermined distance from the inner wall surface on the other end surface side of the drive circuit storage chamber in the one end surface side direction. The leading end of the protruding portion may be closer to the closing plate than the surface of the mold material injected into the motor drive storage chamber.

  According to the present invention, when the molding material is injected into the driving circuit housing chamber, the molding material can be prevented from entering the vent hole side without using a temporary cylindrical member, so that the driving circuit housing can be easily performed. Communication between the indoor space and the vent hole can be ensured.

  FIGS. 1 to 3 show a first embodiment of the present invention, FIG. 1 is a side sectional view of an electric compressor, FIG. 2 is a side sectional view of a third housing showing a molding material injection method, and FIG. It is side surface sectional drawing of the 3rd housing which shows the injection | pouring state of a mold material.

  The electric compressor of the present invention includes a housing 10 formed in a cylindrical shape, a compression unit 20 for compressing a refrigerant, a motor 30 for driving the compression unit 20, and operation control for the motor 30. It is a scroll type electric compressor provided with a drive circuit unit 40 as a motor drive circuit. For example, HFC-134a, carbon dioxide, or the like is used as a refrigerant.

  The housing 10 includes a first housing 11 in which the compression unit 20 is stored, a second housing 12 in which the motor 30 is stored, and a third housing 13 in which the drive circuit unit 40 is stored.

  One end surface of the first housing 11 is closed, and the other end surface is coupled to one end surface of the second housing 12. A refrigerant discharge port (not shown) is provided on the peripheral surface on the one end surface side of the first housing 11.

  The second housing 12 has one end surface coupled to the first housing 11 and the other end surface coupled to one end surface of the third housing 13.

  The 1st housing 11 and the 2nd housing 12 are couple | bonded by the volt | bolt 14 via the center plate mentioned later for rotatably supporting the one end side of the drive shaft mentioned later for the compression part 20 drive.

  The third housing 13 is connected to the second housing 12 at one end surface side and is closed by a closing plate 15 so that the other end surface side can be opened. A refrigerant suction port (not shown) is provided on the peripheral surface on the one end surface side of the third housing 13. Further, the third housing 13 is partitioned by a partition wall 13a into one end surface side including the refrigerant inlet and the other end surface side, and a drive circuit storage chamber 13b for storing the drive circuit section 40 and the motor 30. A refrigerant suction chamber 13c communicating with the side is provided. The third housing 13 on the drive circuit storage chamber 13b side is provided with a vent valve 16 for keeping the pressure in the drive circuit storage chamber 13b constant. The vent valve 16 is made of a cylindrical member made of synthetic resin, and is provided with a gas permeable membrane that allows only gas to pass therethrough without allowing liquid to pass through. The vent valve 16 is attached to a vent hole 13 d that communicates the inside of the drive circuit storage chamber 13 b provided in the third housing 13 and the outside of the housing 10, and air flows between the inside of the drive circuit storage chamber 13 b and the outside of the housing 10. It is provided to do. On the inner side of the vent hole 13d of the third housing 13, an extending portion 13e that surrounds the vent hole 13d and extends toward the closing plate 15 is provided.

  The compression unit 20 is a fixed scroll member 21 fixed to one end side of the first housing 11 and a orbiting scroll member provided on the other end side of the first housing 11 so as to be turnable with respect to the fixed scroll member 21. 22.

  The fixed scroll member 21 is a disk-shaped member provided so as to partition the inside of the first housing 11, and a spiral body 21 a is provided on the surface on the orbiting scroll member 22 side. In addition, a refrigerant discharge hole 21 b for discharging the refrigerant compressed in the compression unit 20 is provided in the central portion in the radial direction of the fixed scroll member 21. A refrigerant discharge chamber 11a is formed between one end surface in the first housing 11 and the fixed scroll member 21, and refrigerant discharged from the refrigerant discharge port flows into the refrigerant discharge chamber 11a.

  The orbiting scroll member 22 is provided with a spiral body 22 a on the surface on the fixed scroll member 21 side, and one end side of a drive shaft 23 for transmitting the rotational force of the motor 30 is connected to the opposite surface via a drive bush 24. Has been.

  The drive shaft 23 is provided so as to extend along the central axis of the second housing 12. The drive shaft 23 is provided such that the connecting portion 23 a with the drive bush 24 is eccentric from the rotation center of the drive shaft 23. The drive shaft 23 is rotatably supported at one end side by a center plate 25 provided between the compression unit 20 and the motor 30 via a ball bearing 26, and the other end side is provided on the other end surface side of the second housing 12. The bearing 12a is rotatably supported via a ball bearing 27. That is, the drive shaft 23 is rotated by the motor 30 so as to turn the orbiting scroll member 22 on a predetermined circular orbit.

  The center plate 25 is provided so as to partition the space on the compression unit 20 side in the housing 10 and the space on the motor 30 side, and a communication hole is provided for communicating the space on the compression unit 20 side and the space on the motor 30 side. ing. Further, the center plate 25 is provided with a flange portion 25 a over the circumferential direction of the outer peripheral surface, and the flange portion 25 a is sandwiched between the first housing 11 and the second housing 12.

  The motor 30 includes a rotor 31 made of a permanent magnet fixed to the drive shaft 23, and a stator 32 provided so as to surround the rotor 31 and fixed in the second housing 12.

  The drive circuit unit 40 includes an inverter circuit 41 having a plurality of power semiconductor elements 41a on a substrate, a power circuit component 42 such as a smoothing capacitor and a noise filter, a control unit 43 having a microcomputer configuration, and the like in the drive circuit storage chamber 13b. It is stored. Insulating mold material 44 such as epoxy resin or silicone resin is injected into drive circuit storage chamber 13b to protect components such as inverter circuit 41, power circuit component 42 and control unit 43 from vibration, moisture, and the like. It has come to be.

  In addition, this electric compressor is provided to restrict the turning position of the orbiting scroll member 22, and includes a pin provided on each of the orbiting scroll member 22 and the center plate 25 and a connecting member for connecting the pins to each other. A position restriction mechanism 50 is provided.

In the electric compressor configured as described above, when the motor 30 is energized and the drive shaft 23 is rotated, the orbiting scroll member 22 orbits relative to the fixed scroll member 21 in the compression unit 20. Thus, refrigerant flowing into the refrigerant suction port or al housing 20 through the partition wall 13a of the refrigerant suction chamber 13c to cool the power semiconductor element 41a of the inverter circuit 41 of the drive circuit section 40, the second housing 12 The motor 30 is cooled by circulating through the inside. The refrigerant flowing through the second housing 12 flows between the orbiting scroll member 22 and the center plate 25 through the communication hole of the center plate 25, cools the orbiting position regulating mechanism 50, and then flows into the compression unit 20. To do. The refrigerant compressed in the compression unit 20 flows into the refrigerant discharge chamber 11a from the refrigerant discharge hole 21b and is discharged from the refrigerant discharge port.

  Further, when the pressure changes with the change in the temperature in the drive circuit storage chamber 13b due to the operation of the electric compressor or the change in the installation environment, air flows through the vent valve 16, so that the inside of the drive circuit storage chamber 13b. The pressure is kept constant.

Here, a process of injecting the molding material 44 into the drive circuit storage chamber 13b of the third housing 13 will be described. First, as shown in FIG. 2, the third housing 13 to which the closing plate 15 is not attached is disposed with the opening of the drive circuit storage chamber 13b facing upward. Next, the molding material 44 is injected into the drive circuit housing chamber 13b from the opening, and the closing plate 15 is attached. At this time, as shown in FIG. 3, the vent hole 13d is surrounded by the extending portion 13e and the inner surface of the third housing 13, so that the molding material 44 injected into the drive circuit storage chamber 13b becomes the vent hole 13d. There is no entry to the side.

  Thus, according to the electric compressor of the present embodiment, the extending portion 13e that surrounds the air hole 13d and extends toward the closing plate 15 is provided inside the third housing 13 where the air hole 13d is located. Therefore, when the molding material 44 is injected into the drive circuit storage chamber 13b, the molding material 44 can be prevented from entering the ventilation hole 13d, and the ventilation hole 13d and the space of the drive circuit storage chamber 13b can be easily formed. You can communicate.

  FIG. 4 shows a second embodiment of the present invention and is a side sectional view of a third housing showing an injection state of a molding material. In addition, the same code | symbol is attached | subjected and shown to the component similar to the said embodiment.

  In the electric compressor of the present invention, the vent hole 13d is provided at a predetermined distance L from the inner wall surface of the drive circuit storage chamber 13b on the refrigerant suction chamber 13c side to the closing plate 15 side. That is, the vent hole 13d is provided at a position higher than the height of the upper surface of the molding material 44 when the molding material 44 is injected. Thereby, as shown in FIG. 4, the vent hole 13d is provided at a position higher than the height of the upper surface of the molding material 44 when the molding material 44 is injected, and is injected into the drive circuit housing chamber 13b. The molding material 44 does not enter the vent hole 13d side.

  Thus, according to the electric compressor of the present embodiment, the vent hole 13d is provided at a predetermined distance L from the inner wall surface of the drive circuit storage chamber 13b on the refrigerant suction chamber 13c side to the closing plate 15 side. When the molding material 44 is injected into the drive circuit housing chamber 13b, the molding material 44 can be prevented from entering the vent hole 13d, and the vent hole 13d and the space of the driving circuit housing chamber 13b are easily communicated. be able to.

  FIG. 5 shows a third embodiment of the present invention, and is a side sectional view of a third housing showing an injection state of a molding material. In addition, the same code | symbol is attached | subjected and shown to the component similar to the said embodiment.

  In the electric compressor of the present invention, the air vent 13 d is provided in the closing plate 15. That is, as in the second embodiment, the vent hole 13d is provided at a position higher than the height of the upper surface of the mold material 44 when the mold material 44 is injected. As a result, as shown in FIG. 5, the vent hole 13d is provided at a position higher than the upper surface of the mold material 44 when the mold material 44 is injected, so that the mold material injected into the drive circuit housing chamber 13b. 44 does not enter the vent 13d side.

  Thus, according to the electric compressor of the present embodiment, the vent hole 13d is provided in the closing plate 15, so that when the molding material 44 is injected into the drive circuit storage chamber 13b, as in the second embodiment. The mold material 44 can be prevented from entering the vent hole 13d, and the vent hole 13d can be easily communicated with the space of the drive circuit storage chamber 13b.

Side surface sectional drawing of the compressor which shows 1st Embodiment of this invention. Side surface sectional view of the third housing showing the injection method of the mold material Side surface sectional view of the third housing showing the injection state of the mold material Side surface sectional drawing of the 3rd housing which shows the injection | pouring state of the mold material which shows 2nd Embodiment of this invention Side surface sectional drawing of the 3rd housing which shows the injection | pouring state of the mold material which shows 3rd Embodiment of this invention

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Housing, 13 ... 3rd housing, 13b ... Drive circuit storage chamber, 13d ... Ventilation hole, 13e ... Extension part, 15 ... Closure plate, 16 ... Ventilation valve, 20 ... Compression part, 30 ... Motor, 40 ... Drive Circuit part 44 ... Mold material.

Claims (3)

Electric compression provided with a compression section for compressing refrigerant sucked into the housing, a motor for driving the compression section, and a motor drive circuit for driving the motor, and provided with a drive circuit storage chamber for storing the motor drive circuit in the housing In the machine
One end surface of the drive circuit storage chamber is provided so as to be opened and closed by a closing plate,
The housing is provided with a vent hole for attaching a vent valve that keeps the pressure in the drive circuit housing chamber constant.
An electric compressor characterized in that an extending portion is provided on the inner side of the housing where the air vent is located and extends toward the closing plate so as to surround the air vent. 2. The electric compression according to claim 1, wherein the ventilation hole is provided at a distal end of the extension portion, and is provided at a predetermined distance from an inner wall surface on the other end surface side of the drive circuit storage chamber toward one end surface side. Machine. 3. The electric compressor according to claim 1, wherein a tip of the extending portion is closer to a closing plate than a surface of a mold material injected into the motor drive storage chamber .

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