JP2009257102A - Motor-driven compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor-driven compressor capable of effectively preventing vibration of electronic parts by external vibration by a gel-like resin material. <P>SOLUTION: This motor-driven compressor 1 is provided so that a motor control chamber 33 having an opening upper surface is arranged in a metallic housing member 30 and a resin housing member 31, and the electronic parts 34, 35, 37 and 38 are stored in the motor control chamber 33, and the gel-like resin material 41 is filled in the motor control chamber 33 for storing the electronic parts 34, 35, 37 and 38, and an opening of the motor control chamber 33 filled with the gel-like resin material 41 is blocked up by a cover 42. A rib 40c supported by the resin housing member 31 is arranged around a transformer 37 and an electrolytic capacitor 38 being a tall part. The gel-like resin material 41 is filled up to at least a position higher than a bottom surface of the rib 40c. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an electric compressor that incorporates an electric motor that drives a compression mechanism together with a compression mechanism that compresses refrigerant.

  A conventional electric compressor of this type is disclosed in Patent Document 1. As shown in FIG. 5, the electric compressor 100 includes a motor control chamber 103 configured by a metal housing member 101 and a protective case 102 fixed to the metal housing member 101. In the motor control chamber 103, a substrate 104 and an element 105, which are electronic components, are accommodated. The motor control chamber 103 is filled with the gel-like resin material 106 up to its upper limit. The upper surface of the motor control chamber 103 filled with the gel resin material 106 is closed with a cover 107.

  In the above configuration, since the substrate 104 and the element 105 are housed in the motor control chamber 103 in a state surrounded by the gel resin material 106, when the external vibration is transmitted to the motor control chamber 103, the vibration is generated. Since it is transmitted while being attenuated by the gel-like resin material 106, vibration of the substrate 104 and the element 105 is prevented as much as possible.

A technique similar to that described above is also disclosed in Patent Document 2.
JP 2006-316754 A JP 2007-315269 A

  However, in the conventional electric compressor 100, since the gel-like resin material 106 is filled in the entire region of the motor control chamber 103 without a gap, the amount of gel used is large, and the electric compressor 100 becomes heavy.

  In addition, since the gel agent injected into the motor control chamber 103 contracts during the drying process, even if the gel agent is injected up to the upper limit of the height of the motor control chamber 103, the gel resin material 106 and the cover 107 are not separated. There is a high possibility of gaps. If there is a gap between the gel resin material 106 and the cover 107, the gel resin material 106 easily vibrates in the lateral direction of the motor control chamber 103 (the arrow direction in FIG. 5) due to external vibration. Then, for example, a large vibration load acts on the element 105 on the substrate 104 because the vibration load of the gel-like resin material 106 located on one side and the other side in the vibration direction acts on the element 105. Therefore, there is a problem that vibration cannot be effectively prevented by the gel-like resin material 106. In particular, the electric compressor 100 is usually mounted on an engine, and a vibration with a large acceleration is applied from the engine.

  Then, an object of this invention is to provide the electric compressor which can prevent effectively the vibration of the electronic component by external vibration with a gel-like resin material.

  According to the first aspect of the invention for achieving the above object, a motor control chamber having an upper surface opened in a housing is provided, and an electronic component is accommodated in the motor control chamber and a gel is placed in the motor control chamber in which the electronic component is accommodated. The motor control chamber is filled with a resin-like resin material and the opening of the motor control chamber filled with a gel-like resin material is closed with a cover, and a rib supported by a housing is provided around the electronic component. The gel-like resin material is filled to a position at least higher than the bottom surface.

  The invention according to claim 2 is the electric compressor according to claim 1, wherein the electronic component having the rib arranged around it is a tall component.

  A third aspect of the present invention is the electric compressor according to the first or second aspect, wherein the motor control room has a position lower than the height of the motor control room and a partial region of the opening of the motor control room. A covering gel pressing part is provided, and the gel pressing part is provided with a rib.

  According to the first aspect of the present invention, when external vibration is transmitted in the lateral direction of the motor control chamber, the vibration is transmitted to the electronic component while being attenuated by the gel-like resin material. The electronic component is subjected to the vibration load of the gel-like resin material located on one side and the other side in the vibration direction across the electronic component, but the electronic component is provided with ribs around the electronic component. Only the vibration load of the gel-like resin material located inside the rib acts on the part. Therefore, vibration can be effectively prevented by the gel-like resin material.

  According to the invention of claim 2, in addition to the effect of the invention of claim 1, the tall component is weak against the vibration load of the gel-like resin material, but the vibration load itself is reduced. Can prevent damage.

  According to the invention of claim 3, in addition to the effect of the invention of claim 1 or 2, it is not necessary to fill the gel-like resin material up to the height upper limit of the motor control chamber, so the amount of gel agent used is Less is enough. Moreover, when the gel injected into the motor control chamber dries, the gel contracts and a gap is generated below the gel presser. The gel located above the bottom of the gel presser is in the gap. Because it enters under its own weight and the gel agent is filled under the gel holding part without any gap, the gel resin material cannot be displaced greatly in the height direction of the motor control chamber, and the vibration of the gel resin material due to external vibration is effective To be suppressed. From the above, it is possible to reduce the weight by reducing the amount of gel used, and it is possible to effectively prevent vibration in the height direction of the motor control chamber by the gel resin material.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
1 to 3 show a first embodiment of the present invention, FIG. 1 is a cross-sectional view of an electric compressor, FIG. 2 is a top view of a motor control chamber with a cover removed, and FIG. FIG. 3B is a cross-sectional view showing a state in which the electronic parts are housed in the motor control room, and FIG. 3B is a process of assembling the motor control circuit part. It is sectional drawing which shows the state filled.

  As shown in FIG. 1, the electric compressor 1 has a housing 2. The housing 2 includes a substantially cylindrical compressor housing member 3, a front housing member 4 disposed on one opening side surface of the compressor housing member 3, and a motor housing disposed on the other opening side surface of the compressor housing member 3. It is comprised from the member 5. Both the compressor housing member 3 and the motor housing member 5 are made of an aluminum alloy. The front housing member 4 will be described below.

  The compression mechanism unit 10 is accommodated in the compressor housing member 3. The compression mechanism unit 10 includes a cylinder block 11 and a front side block 12 and a rear side block 13 that are respectively disposed on both side surfaces of the cylinder block 11. The blocks 11, 12 and 13 are fixed by bolts (not shown), and a cylinder chamber 14 is formed in the blocks 11, 12 and 13. The cylinder block 11 and the side blocks 12 and 13 on both sides are made of an aluminum alloy in the same manner as the housing members 3, 4 and 5.

  A rotor 15 is accommodated in the cylinder chamber 14. A rotation shaft 16 passes through the center of the rotor 15, and the rotor 15 and the rotation shaft 16 are fixed. The rear side of the rotating shaft 16 protrudes outside from the rear side block 13 and also serves as a rotating shaft of the electric motor 6 described below. The rotating shaft 16 is rotatably supported by the rear side block 13 and the motor housing member 5 by a metal bearing portion 16a and a ball bearing portion 16b.

  Vane grooves 17 that open to the outer peripheral surface are formed at equally spaced positions on the outer peripheral side of the rotor 15. A vane 18 is disposed in each vane groove 17 so as to protrude freely. A high-pressure refrigerant supply path (not shown) is opened at the bottom of the vane groove 17. Each vane 18 is configured to be biased in the protruding direction by the back pressure of the high-pressure refrigerant. Each vane 18 moves while contacting the inner wall of the cylinder chamber 14 by the biasing force in the protruding direction as described above when the rotary shaft 16 rotates. A plurality of compression chambers are formed in the cylinder chamber 14 between the adjacent vanes 18. Each compression chamber expands its volume in accordance with the rotation of the rotor 15 and repeats a suction stroke for sucking refrigerant, a compression stroke for reducing the volume, compressing the sucked refrigerant, and discharging the refrigerant.

  The refrigerant suction path 20 communicates a suction port (not shown) and a cylinder suction port (not shown) that opens to the cylinder chamber 14. The refrigerant is supplied to the cylinder chamber 14 through the refrigerant suction path 20.

  The refrigerant discharge path 21 communicates a cylinder discharge port (not shown) that opens to the cylinder chamber 14 and a discharge port 21a. The compressed refrigerant in the cylinder chamber 14 is discharged through the refrigerant discharge path 21.

  The electric motor 6 is housed in the motor housing chamber 5 a of the motor housing member 5. The electric motor 6 includes a motor rotor 23 fixed to the rotating shaft 16 and a stator 24 fixed to the inner peripheral surface of the motor housing member 5.

  On the outer periphery of the motor rotor 23, S poles and N poles are alternately magnetized in the circumferential direction. The stator 24 includes a ferromagnetic core 24a and a coil 24b wound around the core 24a. A drive current is supplied to the coil 24b from the motor control circuit unit 25.

  As shown in FIGS. 1 and 2, the front housing member 4 includes a metal housing member 30 made of aluminum alloy and a resin housing member 31 made of synthetic resin. The resin housing member 31 has a substantially frame shape, and is fixed to the metal housing member 30 with screws 32. A motor control chamber 33 having an upper surface opened by the metal housing member 30 and the resin housing member 31 is configured. A bus bar (not shown) as electrical wiring is insert-molded in the resin housing member 31.

  The motor control circuit unit 25 is accommodated in the motor control chamber 33. The motor control circuit unit 25 includes a motor drive element 34, which is an electronic component, a circuit board 35, and the like. These electronic components and a bus bar (not shown) constitute an inverter circuit. The motor drive element 34 is fixed to the bottom surface of the motor control chamber 33 with screws (not shown). The bottom surface of the motor drive element 34 is in close contact with the metal housing member 30 and is efficiently cooled by the suction refrigerant through the metal housing member 30. The motor drive element 34 has a lead portion (not marked in particular) protruding upward. The circuit board 35 is disposed immediately above the motor drive element 34 and is fixed to the metal housing member 30 with screws (not shown). A land portion (not shown) of the circuit board 35 and a lead portion (not shown) of the motor drive element 34 are soldered. On the upper surface of the circuit board 35, a transformer 37, an electrolytic capacitor 38, and the like, which are electronic components, are mounted. The transformer 37 is a heavy component and a tall component. The electrolytic capacitor 38 is a tall component.

  Further, as shown in FIGS. 2 and 3, the resin housing member 31 is integrally provided with a gel pressing portion 40 protruding into the motor control chamber 33 at a position h lower than the height H of the motor control chamber 33. ing. The gel holding part 40 has only an opening 40a for exposing the transformer 37 and the electrolytic capacitor 38 and two openings 40b for welding, and is arranged in a large area of the motor control chamber 33. . A rib 40c protrudes downward from the periphery of the opening 40a. The lower end of the rib 40 c reaches near the upper surface of the circuit board 35.

  The motor control chamber 33 is filled with the gel-like resin material 41 up to a position at least higher than the bottom surface of the gel pressing portion 40, that is, a position substantially above the top surface of the gel pressing portion 40 in this embodiment. The gel agent of the gel-like resin material 41 is, for example, silicon gel. As described above, the rib 40c is disposed around the transformer 37 and the electrolytic capacitor 38, which are tall components, and the gel-like resin material 41 is filled to a position at least higher than the bottom surface of the rib 40c.

  The upper surface of the motor control chamber 33 is closed with a cover 42. The cover 42 is fixed to the resin housing member 31 with screws 43.

  Next, an outline of the assembly procedure of the motor control circuit unit 25 will be described. It is assumed that electronic components such as a transformer 37 and an electrolytic capacitor 38 are mounted in advance on the circuit board 35, and electronic components are also mounted in advance on the resin housing member 31.

  The metal housing member 30 is set so that the bottom surface of the motor control chamber 33 faces downward, and the motor drive element 34 is fixed to the bottom surface of the metal housing member 30 with screws. Next, the circuit board 35 is fixed to a predetermined position of the metal housing member 30 with screws. Next, the land portion of the circuit board 35 and the lead portion of the motor drive element 34 are soldered. Next, the resin housing member 31 is fixed to a predetermined position of the metal housing member 30 with screws 32. Thus, the state shown in FIG.

  Next, a molten gel agent is injected into the motor control chamber 33. The gel agent is not injected up to the height limit of the motor control chamber 33, but is injected up to the height of the upper surface of the gel pressing portion 40. Here, since the melted gel agent shrinks during the drying process, a gap is formed on the bottom surface of the gel pressing portion 40. However, since the gel agent located above the bottom surface of the gel pressing portion 40 enters into the gap by its own weight, finally, as shown in FIG. The gel-like resin material 41 is formed with no gap on the bottom surface.

  Finally, the cover 42 is fixed to the resin housing member 31 with screws 43, and the motor control chamber 33 is closed.

  In the above configuration, when the electric motor 6 is energized from the motor control circuit unit 25, the electric motor 6 is driven and the rotor 15 of the compression mechanism unit 10 is rotated. Then, the compression mechanism unit 10 is driven, the refrigerant sucked from the suction port (not shown) is sucked into the cylinder chamber 14 of the compression mechanism unit 10, and the refrigerant compressed in the cylinder chamber 14 of the compression mechanism unit 10 is discharged. Is done. The refrigerant discharged from the compression mechanism unit 10 is discharged out of the housing 2 through the discharge port 21a.

  For example, when vibration from the engine is transmitted in the lateral direction of the motor control chamber 33 (in the directions of arrows B1 and B2 in FIGS. 1 and 2), the vibration is attenuated by the gel-like resin material 41 and the transformer 37 and the electrolytic capacitor 38. It is transmitted to electronic parts such as. Then, the vibration load of the gel-like resin material 41 located on one side and the other side in the vibration direction acts on the transformer 37 and the electrolytic capacitor 38 with the transformer 37 and the electrolytic capacitor 38 interposed therebetween. Here, since the rib 40c is provided around the transformer 37 and the electrolytic capacitor 38, only the vibration load of the gel-like resin material 41 located inside the rib 40c acts. Therefore, vibration can be effectively prevented by the gel-like resin material 41.

  In the first embodiment, the ribs 40c are arranged around a transformer 37 and an electrolytic capacitor 38, which are tall parts among electronic parts. Although the tall component is weak against the vibration load of the gel-like resin material 41, since the vibration load itself is reduced as described above, the transformer 37 and the electrolytic capacitor 38 can be prevented from being damaged by the vibration load.

  In the first embodiment, the motor control chamber 33 is provided with a gel pressing portion 40 that is lower than the height of the motor control chamber 33 and covers a part of the opening of the motor control chamber 33. The part 40 is provided with a rib 40c. Therefore, it is not necessary to fill the gel-like resin material 41 up to the upper limit of the height of the motor control chamber 33, so that the amount of gel used can be reduced. Further, when the gel injected into the motor control chamber 33 is dried, the gel contracts and a gap is generated below the gel pressing portion 40. The gap is positioned above the bottom surface of the gel pressing portion 40. The gel agent enters by its own weight, and the gel agent is filled below the gel pressing portion 40 without a gap. Therefore, the gel-like resin material 41 cannot be displaced greatly in the height direction of the motor control chamber 33 (A arrow direction in FIG. 1), and vibration of the gel-like resin material 41 due to external vibration is effectively suppressed. As described above, it is possible to reduce the weight by reducing the amount of gel used, and it is possible to effectively prevent vibration in the height direction of the motor control chamber 33 by the gel-like resin material 41.

(Second Embodiment)
FIG. 4 shows a second embodiment, in which the motor control chamber with the cover removed is viewed from above. As shown in FIG. 4, the resin housing member 31 is provided with ribs 50 and 51 in a bridge shape by integral molding. The rib 50 is disposed so as to surround the entire circumference of the transformer 37 and the electrolytic capacitor 38 which are tall components. The motor control chamber 33 is filled with the gel resin material 41 to a position at least higher than the bottom surface of the rib 50.

  Since other configurations are the same as those of the first embodiment, description thereof will be omitted. The same components in the drawings are given the same reference numerals for clarification.

  Also in the second modified example, for the same reason as in the first embodiment, the vibration transmitted in the lateral direction of the control chamber 33 (directions indicated by arrows B1 and B2 in FIG. 4) is effectively attenuated by the gel-like resin material 41. Can do.

1 is a cross-sectional view of an electric compressor according to a first embodiment of the present invention. It is the figure which showed 1st Embodiment of this invention and looked at the motor control chamber which removed the cover from the upper surface. 1 shows a first embodiment of the present invention, (a) is a process of assembling a motor control circuit unit, and is a cross-sectional view showing a state in which electronic components are housed in a motor control room, (b) is a diagram of a motor control circuit unit It is an assembling process, Comprising: It is sectional drawing which shows the state which filled the gel agent in the motor control chamber. It is the figure which showed 2nd Embodiment of this invention and looked at the motor control chamber which removed the cover from the upper surface. It is sectional drawing of the motor control circuit part of a prior art example.

Explanation of symbols

2 Housing 30 Metal housing member (housing)
31 Resin housing member (housing)
33 Motor control room 34 Motor drive element (electronic parts)
35 Circuit board (electronic parts)
37 Transformer (electronic parts, tall parts)
38 Electrolytic capacitors (electronic parts, tall parts)
40 Gel holding part 40c Rib 41 Gel-like resin material 42 Cover 50 Rib

Claims (3)

A motor control chamber (33) whose upper surface is opened is provided in the housing (2), and the electronic components (34, 35, 37, 38) are accommodated in the motor control chamber (33) and the electronic components ( 34, 35, 37, 38) is filled with the gel-like resin material (41) in the motor control chamber (33) in which the motor-control chamber (33) is accommodated, and the motor control chamber (33) is filled with the gel-like resin material (41). An electric compressor (1) whose opening is closed by a cover (42),
Ribs (40c, 50) supported by the housing (2) are provided around the electronic components (37, 38), and the gel-like resin is at least higher than the bottom surface of the ribs (40c, 50). An electric compressor (1) characterized by being filled with a material (41). An electric compressor (1) according to claim 1,
The electric compressor (1), wherein the electronic parts (37, 38) around which the ribs (40c, 50) are arranged are tall parts (37, 38). The electric compressor (1) according to claim 1 or 2,
The motor control chamber (33) is provided with a gel pressing portion (40) that is lower than the height of the motor control chamber (33) and covers a part of the opening of the motor control chamber (33). The electric compressor (1), wherein the rib (40c) is provided on the gel pressing part (40).

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