JP2010148296A - Electric compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric compressor equipped with a leakage prevention technology of a capacitor when the inverter case is damaged. <P>SOLUTION: When a vehicle collides against an obstacle, a large force is applied in the direction shown by an arrow in the drawing, and the outer circumferential walls 73 and 74 of the inverter case 49 are destroyed. A discharge member 75 moves in the direction of an arrow as the inverter case 49 is destroyed. The tip portion 76 breaks through a storage container 55 and plunges into an electrolytic capacitor 50 to destroy a part thereof. Since the storage container 55 is supported by an outer wall 68 (pressure receiving member) provided in order to stabilize the electrolytic capacitor 50, the tip portion 76 can plunge into the storage container 55 and the electrolytic capacitor 50 certainly. In the electrolytic capacitor 50 thus destroyed, the tip portion 76 of the discharge member 75 comes into contact with an electric conductor to cause short-circuiting the electrolytic capacitor. Consequently, charges stored in the electrolytic capacitor 50 are discharged immediately and the risk of leakage is eliminated absolutely. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an electric compressor that houses a compression mechanism and a motor that drives the compression mechanism in a housing, and includes an inverter that controls driving of the motor in a part of the housing.

  For example, an electric compressor mounted on a vehicle such as a hybrid vehicle, an electric vehicle, or a fuel cell vehicle is provided with an inverter for controlling a motor that drives a compressor. The inverter is composed of a capacitor and other electrical components mounted on a substrate, and is attached to the housing of the electric compressor while being housed in a relatively strong inverter case. For further safety, the inverter is surrounded by rubber or the like, and measures such as making the structure resistant to impacts and vibrations, and providing an explosion-proof structure for the capacitor itself are taken.

  However, when the vehicle collides with an obstacle or the like and a particularly large force is applied to the electric compressor, the inverter case may be destroyed. The destruction of the inverter case may damage an internal inverter and cause the capacitor storing a relatively large charge to leak.

  For this reason, when an operator etc. puts his hand from the broken part of the inverter case during repair or removal work of the electric compressor, the operator etc. may have an electric shock. Therefore, in an electric compressor, it is necessary to prevent electric leakage from the capacitor when the inverter case housing the inverter is broken, but no disclosure of an appropriate electric leakage avoidance technique has hitherto been found.

  In a technical field such as a hybrid vehicle, an electric vehicle, or a fuel cell vehicle, for example, Patent Document 1 discloses a device that prevents leakage of a fuel cell in the event of a vehicle collision. As shown in FIG. 2 of Patent Document 1, the fuel cell is housed in a battery housing case formed of a resistor, and end plates serving as a positive electrode and a negative electrode are formed at both ends. The battery housing case is provided with a contact portion at a position facing the end of each end plate.

  When an abnormal external force is applied during a vehicle collision, either the fuel cell or the battery housing case moves, and each contact portion of the battery housing case comes into contact with the end portion of each end plate. For this reason, the positive electrode and the negative electrode of the fuel cell are short-circuited, and the electrical energy stored in the fuel cell is consumed.

JP 2003-189415 A

  In the leakage prevention technique disclosed in Patent Document 1, the end plate, which is a special contact for connecting to the contact portion of the battery housing case, which is a resistor, must be provided exclusively for the positive electrode and the negative electrode of the fuel cell. For this reason, a dedicated fuel cell has to be designed, and there is a problem that the structure must be complicated. Therefore, it is difficult to apply the prior art disclosed in Patent Document 1 to the electric compressor.

  An object of the present invention is to provide an electric compressor equipped with a capacitor leakage prevention technique when an inverter case is broken.

  According to a first aspect of the present invention, there is provided an electric compressor in which a compression mechanism and a motor that drives the compression mechanism are housed in a housing, and an inverter that controls driving of the motor is provided in a part of the housing. Is formed of at least one capacitor mounted on the substrate and other electrical components, and is housed in an inverter case fixed to the housing, and a discharge member facing the capacitor is provided at a distance. Features.

  According to this invention of Claim 1, since the said discharge member rushes into the said capacitor | condenser at the time of destruction of the said inverter case, and the electrode of the said capacitor | condenser can be short-circuited, there exists a possibility of the electric leakage from the said capacitor | condenser by simple structure. Can be eliminated. Further, since the configuration is simple, the electric compressor does not need to be significantly changed from the conventional configuration.

  The invention of claim 2 is characterized in that a pressure receiving member is provided around the capacitor to receive pressure generated on the capacitor side when contacting the discharge member, so that the discharge member contacts the capacitor. And the force at the time of rushing can be received by the pressure receiving member, and the discharge member can be surely rushed into the capacitor.

  The present invention according to claim 3 is characterized in that the pressure receiving member is an outer wall of an inverter base to which the substrate is attached. Therefore, a member provided for stably holding the capacitor can be used, and the pressure receiving member is specially used. The effect similar to that of the second aspect can be obtained without the need to provide the above.

  The present invention according to claim 4 is characterized in that the pressure receiving member is a resin filled in at least a part of the inverter case, and therefore the resin filled in order to stably hold a capacitor and an electrical component. Thus, the same effects as those of the second aspect can be obtained without the need to provide a pressure receiving member.

  The present invention according to claim 5 is characterized in that the discharge member is provided in a state of penetrating the inverter case or the housing, so that the discharge member can be manufactured separately and easy to install. It is.

  The present invention of claim 6 is characterized in that the discharge member is provided on the inner wall surface of the inverter case or the housing, and therefore the discharge member exists in the inverter case. There is no need to consider a new seal structure.

  According to the seventh aspect of the present invention, since the discharge member is provided on an inverter base to which the substrate is attached, positioning of the discharge member and the capacitor is easy.

  The present invention according to claim 8 is characterized in that the inverter case is integrally formed by combining a plurality of divided case members, and is fixed to a part of the housing. The inverter can be stored easily.

  The present invention according to claim 9 is characterized in that the inverter case includes at least one cover case fixed to the housing so as to cover the substrate attached to a part of the housing. Therefore, compared with the invention of claim 8, the number of parts of the inverter case can be reduced, and the configuration becomes simple.

  The invention of claim 10 is characterized in that the capacitor is composed of a plurality of electrolytic capacitors mounted on the substrate, and the discharge member is provided to face each of the plurality of electrolytic capacitors. Therefore, even if the inverter includes a plurality of electrolytic capacitors, each electrolytic capacitor is surely destroyed by the intrusion of the discharge member, so that the possibility of electric leakage in each electrolytic capacitor can be eliminated.

  The present invention according to claim 11 is characterized in that the inverter case is configured by dividing the case body into a case cover and a case cover, so that the function and effect of claim 8 can be obtained with the simplest configuration. .

  The invention of claim 12 is characterized in that the discharge member is provided in a state of being sandwiched by a seal member at a joint portion between the case members or a joint portion between the inverter case and the housing. Therefore, by sharing the discharge member and the seal member, the number of parts can be reduced and the structure can be simplified.

  The present invention according to claim 13 is characterized in that the discharge member has a pointed portion on the side facing the capacitor, so that the entry into the capacitor can be reliably performed.

  The present invention can prevent electric leakage in the inverter of the electric compressor.

(First embodiment)
The first embodiment shown in FIGS. 1 to 4 is configured as follows. FIG. 1 shows an outline of an electric compressor including a scroll compressor. In the present specification, the left side of FIG. 1 will be described as the front and the right side as the rear. The housing 1 has a front housing 2 and a rear housing 3, and is configured by fastening both with bolts 4. The housing 1 is shown as a horizontal type compressor. The front housing 2 has a large-diameter cylindrical portion 2a and a bottomed cylindrical small-diameter cylindrical portion 2b extending to the front side of the large-diameter cylindrical portion 2a. The rear housing 3 is formed as a bottomed cylindrical body having a bottom on the rear side.

  A cylindrical boss portion 5 projects into the center of the bottom inner wall of the front housing 2, and a bearing member 6 having a through hole in the center is press-fitted into the opening end side of the large-diameter cylindrical portion 2a. . A drive shaft 7 is disposed between the boss portion 5 and the bearing member 6, and is rotatably supported by bearings 8 and 9, respectively. A seal member 10 is interposed between the bearing member 6 and the drive shaft 7 to seal the front side and the rear side of the bearing member 6. With this configuration, a sealed motor housing chamber 11 is defined on the front side of the bearing member 6.

  A stator 13 having a coil 12 is provided on the inner peripheral surface of the small diameter cylindrical portion 2 b of the front housing 2. A rotor 14 is fixed to the drive shaft 7 so as to be positioned on the inner peripheral side of the stator 13. The coil 12, the stator 13, the rotor 14, and the drive shaft 7 constitute a motor 15 that drives a compression mechanism to be described later.

  A fixed scroll body 16 formed on a circular plate is disposed on the opening end side of the large diameter cylindrical portion 2a. The fixed scroll body 16 has an outer peripheral wall 17 and a fixed spiral wall 18 formed to protrude to the front side. The fixed scroll body 16 is fixed by fastening the rear housing 3 to the front housing 2 with bolts 4 by joining the front end face of the outer peripheral wall 17 to a flange portion 6 a formed on the rear side of the bearing member 6. . With this configuration, a sealed back pressure chamber 19 is defined between the fixed scroll body 16 and the bearing member 6.

  The drive shaft 7 has a rear shaft protruding into the back pressure chamber 19 and is provided with an eccentric shaft 20 having an axis X2 that is eccentric from the axis X1 of the drive shaft 7 by a certain distance. A bush 21 is fitted and fixed to the outer periphery of the eccentric shaft 20. The bush 21 supports a movable scroll body 22 formed on a disk so as to be relatively rotatable by a bearing 23.

  The movable scroll body 22 includes an annular outer peripheral wall 24 and a movable spiral wall 25 formed to protrude to the rear side. The front end surface of the outer peripheral wall 24 is in contact with the flange portion 6 a of the bearing member 6. The movable spiral wall 25 is engaged with the fixed spiral wall 18, and the front end surface of the fixed spiral wall 18 is in contact with the movable scroll body 22, and the rear end surface of the movable spiral wall 25 is in contact with the fixed scroll body 16. Yes. When the movable scroll body 22 is turned, a plurality of compression chambers 26 are formed between the fixed spiral wall 18 and the movable spiral wall 25. Therefore, the fixed scroll body 16 and the movable scroll body 22 constitute the compression mechanism of the present invention.

  A plurality of holes 27 are formed on the front side of the movable scroll body 22, and a plurality of pins 28 formed to protrude to the rear side of the flange portion 6 a of the bearing member 6 are loosely fitted into the plurality of holes 27, respectively. The body 22 is prevented from rotating.

  A suction chamber 29 is formed between the outer peripheral wall 17 of the fixed scroll body 16 and the outer peripheral wall 24 of the movable scroll body 22. The suction chamber 29 communicates with the motor storage chamber 11 through a suction passage (not shown).

  A refrigerant gas suction port 30 communicating with the motor housing chamber 11 is formed on the front side of the large-diameter cylindrical portion 2a of the front housing 2, and is connected to an external pipe connected to an evaporator of an external refrigerant circuit (not shown). . Therefore, the low-pressure refrigerant gas returning from the external refrigerant circuit is introduced from the suction port 30 into the motor housing chamber 11 and further introduced into the suction chamber 29 through a suction passage (not shown). A plurality of thrust grooves (not shown) formed in the outer peripheral surface of the stator 13 and a gap between the stator 13 and the rotor 14 serve as a passage for the refrigerant gas, and the motor 15 is caused by oil mixed in the refrigerant gas. The components and the bearings 8 and 9 are lubricated and cooled.

  A discharge chamber 32 is formed between the partition wall 31 formed inside the rear housing 3 and the fixed scroll body 16. The compression chamber 26 at the center position defined by the fixed scroll body 16 and the movable scroll body 22 communicates with the discharge chamber 32 through a discharge hole 33 formed at the center of the fixed scroll body 16. On the rear side of the fixed scroll body 16, a discharge valve 34 composed of a reed valve for opening and closing the discharge hole 33 and a retainer 35 for regulating the opening degree of the discharge valve 34 are disposed and fixed by bolts 36.

  Accordingly, when the motor 15 is driven, the movable scroll body 22 is rotated around the axis of the fixed scroll body 16 (on the same line as the axis X1 of the drive shaft 7) by the rotation of the drive shaft 7 and the eccentric shaft 20. It is turned. The high-pressure refrigerant gas compressed in the compression chamber 26 by the turning motion of the movable scroll body 22 is discharged from the discharge hole 33 to the discharge chamber 32 through the discharge valve 34.

  The rear housing 3 is formed with an oil separation chamber 38 that encloses a cylindrical oil separator 37. The oil separation chamber 38 communicates with the discharge chamber 32 through a communication hole 39 provided at a position facing the outer peripheral surface of the oil separator 37. The lower end of the oil separator 37 opens into the oil separation chamber 38, and the upper end opens to the discharge port 40. The discharge port 40 is connected to an external conduit connected to a condenser of an external refrigerant circuit (not shown).

  High-pressure oil containing a small amount of refrigerant gas in the oil separation chamber 38 is supplied to the back pressure chamber 19 through the oil outlet passage 41 and the throttle passage 42, lubricates the bearing 23 and the like, and fixes the movable scroll body 22 to the fixed scroll. It is biased toward the body 16 side.

  An oil storage chamber 43 is formed in the rear housing 3 so as to surround the discharge chamber 32. The oil storage chamber 43 communicates with the back pressure chamber 19 through the oil extraction passage 44 and the check valve 45, and keeps the urging force of the movable scroll body 22 due to the pressure of the back pressure chamber 19 during normal operation of the electric compressor. The oil in the back pressure chamber 19 is collected and stored in the oil storage chamber 43 through the check valve 45 and the oil extraction passage 44.

  On the other hand, an aluminum cooling plate 46 is disposed on a part of the outer peripheral surface of the small-diameter cylindrical portion 2b, and an inverter case 49 housing an inverter 48 is fixed to the upper surface of the cooling plate 46 with a seal member 47 interposed therebetween. . The inverter 48 is electrically connected to the coil 12 and controls the driving of the motor 15. The inverter 48 and the inverter case 49 will be described in detail with reference to FIGS.

  FIG. 2 shows the structure of the inverter 48. The inverter 48 includes a substrate 53 on which electric components (not shown) including switching elements such as four electrolytic capacitors 50, coils 51, varistors 52, and transistors called large components are mounted, and an inverter base 54 that fixes the substrate 53. Including.

  Each electrolytic capacitor 50 is disposed in a resin-molded storage container 55, and further integrated with the storage container 55 by a resin filled in a gap. Each electrolytic capacitor 50 has two terminals 56. The storage container 55 has mounting portions 57 formed to protrude at two locations on the side surface. Each attachment portion 57 has a screw hole 58.

  Bonding holes 59 are formed in the substrate 53 at positions corresponding to the respective terminals 56 of the electrolytic capacitor 50. Each terminal 56 is passed through the joint hole 59 and is electrically connected to the substrate 53 by soldering. Further, the coil 51 and the varistor 52 are electrically connected to the substrate 53 by being fixed to the substrate 53. The substrate 53 has two mounting screw holes 60 for fastening the substrate 53 and the storage container 55 together with the inverter base 54 and three mounting screw holes 61 for fixing only the substrate 53 to the inverter base 54. ing.

  The inverter base 54 is integrally formed with a receiving portion 62 that covers a part of the outer surfaces of the coil 51 and the varistor 52. The coil 51 and the varistor 52 are fixed to the receiving portion 62 with a resin adhesive. The inverter base 54 is fixed to the inverter case 49 with two screw holes 63 corresponding to the mounting screw holes 60, three screw holes 64 corresponding to the mounting screw holes 61 (only two are shown), and the inverter base 54. Three mounting screw holes 65 are formed for this purpose.

  FIG. 3 is a cross-sectional view taken along line AA in FIG. 2 and shows a mounting state of the storage container 55 stored in the inverter case 49. The substrate 53 on which the electrolytic capacitor 50 and the storage container 55 are mounted by soldering the terminals 56 is attached to the inverter base 54 by screws 66 that are screwed into the mounting screw holes 60, the screw holes 58, and the screw holes 63. In this attached state, the storage container 55 has a plate-like hard rubber 69 interposed between its outer surface 67 and an outer wall 68 extending downward around the inverter base 54, and is firmly fixed by an adhesive. The outer wall 68 absorbs vibrations from the electric compressor and the vehicle body by the hard rubber 69, and supports the electrolytic capacitor 50 in a stable state. The outer wall 68 corresponds to the pressure receiving member of the present invention, and can particularly receive the force applied from the left side of FIG.

  On the other hand, the inverter case 49 has a two-part structure of a case main body 70 and a case cover 71 that covers the case main body 70. The case main body 70 has a groove 72 at the end, and the lower portion of the storage container 55 is accommodated in the groove 72. Although not shown, the inverter base 54 is fixed to the case main body 70 with screws through the attachment screw holes 65.

  The case cover 71 is formed in a U-shaped cross section, and its outer peripheral wall 73 corresponds to the outer peripheral wall 74 of the case main body 70. A discharge member 75 disposed so as to penetrate the outer peripheral wall 73 is fixed to the outer peripheral wall 73 of the case cover 71. The mounting position of the discharge member 75 is a position where a large force is generated due to a collision of the automobile, for example, a position on the front side of the automobile.

  The discharge member 75 is formed in a T-shaped cross section, and the tip 76 thereof faces the outer surface 67 of the storage container 55, that is, the electrolytic capacitor 50. In the present embodiment, since four electrolytic capacitors 50 are provided, the discharge member 75 is provided at four locations so as to face each electrolytic capacitor 50. Further, the pointed portion 76 of the discharge member 75 is provided at a predetermined interval from the outer surface 67 of the storage container 55 when the inverter 48 and the inverter case 49 are normal.

  When the case cover 71 is attached to the case main body 70, a seal member 78 having a cored bar 77 is interposed between the joint portions of the outer peripheral walls 73 and 74, and is fixed to the case main body 70 by appropriate means. With this configuration, an inverter case 49 whose inside is sealed is formed. The inverter case 49 is attached to the housing 1 by appropriate means in a state where the inverter 48 housed therein is electrically connected to the motor 15 of the electric compressor. The entire internal space of the inverter case 49 formed by attaching the case cover 71 to the case body 70 corresponds to the inverter case of the present invention.

  The operation of the first embodiment configured as described above will be described with reference to FIG. The inverter case 49 that houses the inverter 48 provided in the electric compressor is normally in a normal configuration state as shown in FIG. However, when the automobile collides with an obstacle, a very large force is applied to the electric compressor in the direction indicated by the arrow in FIG. For this reason, the outer peripheral walls 73 and 74 of the inverter case 49 are recessed and broken as shown in the figure.

  The discharge member 75 moves in the direction of the arrow in FIG. The pointed portion 76 breaks through the storage container 55 and enters the electrolytic capacitor 50 to destroy a part of the electrolytic capacitor 50. Since the pressure applied to the storage container 55 when the discharge member 75 enters is received by the outer wall 68 that is a pressure receiving member, the pointed portion 76 can surely enter the storage container 55 and the electrolytic capacitor 50. Inside the broken electrolytic capacitor 50, the tip 76 of the discharge member 75 comes into contact with the electric conductor, thereby short-circuiting the electrolytic capacitor. For this reason, the electric charge accumulated in the electrolytic capacitor 50 is immediately discharged, and there is no fear of electric leakage. Even when a large impact force is applied from the right side of FIG. 4, the outer wall 68 and the electrolytic capacitor 50 move to the left side of FIG. 4 and enter the discharge member 75, and the electrolytic capacitor 50 is destroyed.

The first embodiment described above has the following operational effects.
(1) The leakage of the electrolytic capacitor 50 can be prevented by a simple configuration in which the discharge member 75 is moved using the force at the time of destruction of the inverter case 49 to destroy the electrolytic capacitor 50.
(2) Since the discharge member 75 is inserted into the electrolytic capacitor 50, the electrolytic capacitor 50 can be reliably destroyed and short-circuited.
(3) By sharpening the discharge member 75 that enters the electrolytic capacitor 50, the electrolytic capacitor 50 can be reliably destroyed.
(4) Since the outer wall 68 provided to stably support the electrolytic capacitor 50 can be used as a pressure receiving member that receives the force when the discharge member 75 enters, there is no need to provide a special pressure receiving member.
(5) The electrolytic capacitor 50 does not need to be designed exclusively, and a commercially available product can be used as it is, which is economical.

(Second Embodiment)
The second embodiment shown in FIG. 5 is obtained by changing the configuration of the discharge member 75 in the first embodiment. The same components as those in the first embodiment are denoted by the same reference numerals, and detailed description is given. Omitted.

  In the second embodiment, the seal member 79 interposed between the joint portion of the case body 70 and the case cover 71 sandwiches the discharge member 80 formed in a T shape in place of the cored bar in a sandwich shape. Have. As in the first embodiment, the discharge member 80 has a pointed portion 81 on the side facing the electrolytic capacitor 50. Further, the discharge member 80 is disposed at four positions facing the four electrolytic capacitors 50. Therefore, when the inverter 48 is housed in the case body 70 and the case cover 71 is fixed with the seal member 79 interposed, the discharge members 80 are spaced at positions where the respective tip portions 81 face the respective electrolytic capacitors 50. Arranged.

  When the inverter case 49 is destroyed by an impact, the sharp end portion 81 of the discharge member 80 is pressed toward the electrolytic capacitor 50 along with the destruction. The discharge member 80 breaks through the storage container 55 supported by the outer wall 68 that is a pressure receiving member, and enters the electrolytic capacitor 50. For this reason, in the second embodiment, as in the first embodiment, the electrical conductor of the electrolytic capacitor 50 is short-circuited by the intervention of the tip 81, and the electric charge accumulated in the electrolytic capacitor 50 can be immediately discharged. it can.

(Third embodiment)
In the third embodiment shown in FIG. 6, the configuration of the discharge member 75 and the configuration of the inverter case 49 in the first embodiment are changed, and the same reference numerals are given to the same configurations as those in the first embodiment. Detailed description will be omitted.

  Outer walls 82 and 83 and a mounting base 84 are erected on a part of the outer peripheral surface of the front housing 2 forming the housing 1. A groove 85 for accommodating the electrolytic capacitor 50 is formed between the outer wall 82 and the mounting base 84, and a groove 86 for accommodating the coil 51 is formed between the outer wall 83 and the mounting base 84. A discharge member 87 is provided on the inner wall of the outer wall 82 that forms the groove 85. The discharge member 87 is formed of a separate member formed in a cone shape such as a cone or a pyramid or a wedge shape, and the planar portion thereof is fixed to the outer wall 82 by means (not shown) such as an adhesive or a screw. Has been. The discharge member 87 can also be provided on the outer wall 82 by integral molding. The discharge members 87 are provided in the number corresponding to the number of electrolytic capacitors 50, and the respective tip portions 88 are oriented in the groove portions 85.

  The substrate 53 on which the plurality of electrolytic capacitors 50 and other electrical components and the coil 51 are mounted is electrically connected by the terminals 90 of the plurality of switching elements provided in the unit 89 and integrated with the unit 89. The unit 89 is fixed to the inverter base 54 with screws 91. Each electrolytic capacitor 50 is fixed to the outer wall 68 of the inverter base 54 with an adhesive via a hard rubber 69. As in the first embodiment, the outer wall 68 and the hard rubber 69 absorb external vibrations and can stably support the electrolytic capacitor 50. The inverter base 54 on which the substrate 53 is mounted is placed on the mounting base 84 with the electrolytic capacitor 50 accommodated in the groove 85 and the coil 51 accommodated in the groove 86, and is fixed by means such as screws (not shown). When the inverter base 54 is fixed to the mounting base 84, the pointed portions 88 of the respective discharge members 87 are arranged to face the respective electrolytic capacitors 50 with a predetermined interval.

  On the other hand, the inverter case 92 is constituted by a single cover case formed in a U-shaped cross section. The inverter case 92 covers the substrate 53, and its outer peripheral walls 93 and 94 are connected to the outer walls 82 and 83 through a seal member 78 having a built-in metal core 77, and are fixed by appropriate means (not shown). Accordingly, the substrate 53 is housed in the inverter case 92 in a sealed state. In the third embodiment, the entire space surrounded by the inverter case 92 and the front housing 2 corresponds to the inverter case of the present invention.

  In the third embodiment, the outer peripheral wall 93 of the inverter case 92 and the outer wall 82 of the front housing 2 may be broken by a large impact applied from the left side of FIG. The discharge member 87 moves to the right in FIG. 6 along with the destruction of the inverter case 92, and the pointed portion 88 enters the electrolytic capacitor 50 supported by the outer wall 68 as the pressure receiving member to destroy the electrolytic capacitor 50. Inside the broken electrolytic capacitor 50, as in the first embodiment, the tip 88 contacts the electrical conductor and shorts the electrolytic capacitor, so that the charge accumulated in the electrolytic capacitor 50 is immediately discharged. There is no risk of leakage. Even when a large impact is applied from the right side of FIG. 6, the outer wall 68 and the electrolytic capacitor 50 move to the left side of FIG. 6 and enter the discharge member 87, so that the electrolytic capacitor 50 is reliably destroyed.

(Fourth embodiment)
The fourth embodiment shown in FIG. 7 is obtained by changing the configuration of the discharge member 75 in the first embodiment. The overall configuration is similar to the third embodiment, and the first and second embodiments are the same as those in the first and second embodiments. The same components are denoted by the same reference numerals, and detailed description thereof is omitted.

  The inverter base 95 on which the substrate 53 is mounted includes an outer wall 96 having an L-shaped cross section on the side where the plurality of electrolytic capacitors 50 are disposed. The outer wall 96 has side walls 97 and 98 and is configured to accommodate the electrolytic capacitor 50 between the side walls 97 and 98 and to be accommodated in the groove portion 85 of the front housing 2.

  The side wall 97 is erected with a gap between the outer wall 82 and the outer peripheral wall 93, and the electrolytic capacitor 50 is fixed and held by an adhesive via a hard rubber 99. Similar to the first embodiment, the side wall 97 and the hard rubber 99 absorb vibration from the outside, stably support the electrolytic capacitor 50, and the side wall 97 can receive a large pressure applied to the electrolytic capacitor 50. The side wall 98 is provided with a discharge member 100 having a cone shape or a wedge shape. The discharge member 100 protrudes from the side wall 98 by integral molding, and the pointed portion 101 faces the electrolytic capacitor 50 with a gap. Note that the same number of discharge members 100 as the electrolytic capacitors 50 are provided.

  In the fourth embodiment, when the outer wall 82 and the outer peripheral wall 93 are destroyed by a large impact applied from the left in FIG. 7, the board 53 and the side wall 97 of the outer wall 96 housed in the inverter case 92 are destroyed at the same time. The The side wall 97 is moved to the right in FIG. 7 while supporting the electrolytic capacitor 50 and collides with the discharge member 100, so that the tip 101 of the discharge member 100 enters the electrolytic capacitor 50. As in the first embodiment, the tip 101 destroys the electrolytic capacitor 50 and contacts the electrical conductor to short-circuit the electrolytic capacitor 50. Therefore, the electric charge accumulated in the electrolytic capacitor 50 is immediately discharged, and a leakage current is generated. The fear of Even when a large impact is applied from the right side of FIG. 7, the discharge member 100 moves to the left side of FIG. 7 and enters the electrolytic capacitor 50, and the electrolytic capacitor 50 is reliably destroyed.

  The present invention is not limited to the configuration of each of the embodiments described above, and various modifications are possible within the scope of the gist of the present invention, and can be implemented as follows.

(1) The structure provided in the case main body 70 may be sufficient as the discharge member 75 in 1st Embodiment.
(2) When the electrolytic capacitors 50 are installed in parallel as in the first to fourth embodiments, the discharge members 75, 80, 87, 100 are one of the horizontally long ones facing the electrolytic capacitors 50. It can be constituted by a discharge member.
(3) The discharge members 75, 80, 87, 100 may be provided on the brackets attached to the inverter cases 49, 92, the front housing 2 or the inverter bases 54, 95.
(4) The sharp end portions 76, 81, 88, 101 of the discharge members 75, 80, 87, 100 are not necessarily sharpened, and may be flat end surfaces. Regardless of the shape of the tip portions 76, 81, 88, 101, the tip portions 76, 81, 88, 101 can enter the electrolytic capacitor 50 by the impact force received by the inverter case 49.
(5) The discharge members 75, 80, 87, 100 are not limited to a T-shaped cross section, a cone shape, or a wedge shape, and may have other shapes.

(6) As shown in the embodiment of FIG. 8, the pressure receiving member that receives the pressure applied to the electrolytic capacitor 50 is filled in the inverter case 49 in order to stabilize the electrolytic capacitor 50 and other electrical components mounted on the substrate 53. You may comprise so that the resin 102 made may be utilized. Since the resin 102 fills the entire space in the inverter case 49, the storage container 55 that holds the electrolytic capacitor 50 is also in a stable and fixed state. Therefore, when the inverter case 49 receives an impact, the pointed portion 76 of the discharge member 75 can destroy a part of the resin 102 and reliably enter the storage container 55 and the electrolytic capacitor 50. The configuration using the resin 102 as the pressure receiving member is not limited to the configuration in which the entire space in the inverter case 49 is filled with the resin 102 as described above, and at least a portion around the electrolytic capacitor 50 is filled with the resin 102. It may be a configuration. Even in this configuration, the resin 102 can firmly support the electrolytic capacitor 50, so that the tip 76 of the discharge member 75 surely enters the electrolytic capacitor 50. Moreover, the structure filled with the resin 102 can be used in place of the outer walls 68 and 96 as pressure receiving members in the first to fourth embodiments.

(7) The pressure receiving member that receives the pressure applied to the electrolytic capacitor 50 is not formed by using the outer walls 68 and 96 of the inverter bases 54 and 95 as in the first to fourth embodiments, but is configured by a dedicated member. Also good.
(8) The number of electrolytic capacitors 50 is not limited to four, and the present invention can be implemented even when there are one or more electrolytic capacitors.
(9) The inverter case 49 is not limited to the two-divided configuration as in the first and second embodiments, and may be a multi-divided configuration with three or more divisions. Further, the inverter case 92 in the third and fourth embodiments can be divided into a plurality of parts in the vertical direction of FIGS. 6 and 7.
(10) When the electrolytic capacitor 50 mounted on the substrate 53 of the inverter 48 is mounted on the vehicle, the present invention can be implemented regardless of whether the electrolytic capacitor 50 is disposed on the front side or the rear side of the vehicle. it can.
(11) The present invention can be implemented not only in electrolytic capacitors but also in other types of capacitors such as film capacitors.
(12) The electric compressor is not limited to the scroll type, and can be constituted by various compressors such as a swash type, a wobble type, a vane type, a screw type, and a roots type.
(13) The electric compressor embodying the present invention can be mounted on vehicles such as hybrid vehicles, electric vehicles and fuel cell vehicles, or industrial vehicles such as forklifts.

It is a longitudinal cross-sectional view which shows the electric compressor which shows 1st Embodiment. It is a disassembled perspective view of an inverter. It is the sectional view on the AA line of FIG. It is an AA line sectional view showing an operation of a 1st embodiment. It is sectional drawing equivalent to FIG. 3 which shows 2nd Embodiment. It is sectional drawing which shows 3rd Embodiment. It is sectional drawing which shows 4th Embodiment. It is sectional drawing which shows other embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Housing 11 Motor accommodating chamber 15 Motor 16 Fixed scroll body 22 Movable scroll body 48 Inverter 49, 92 Inverter case 50 Electrolytic capacitor 53 Substrate 54, 95 Inverter base 55 Storage container 56, 90 Terminal 57 Mounting part 66, 91 Screw 68, 96 Outer wall (pressure receiving member)
69, 99 Hard rubber 70 Case body 71 Case cover 75, 80, 87, 100 Discharge member 76, 81, 88, 101 Pointed portion 78, 79 Seal member 84 Mounting base 89 Unit 97 Side wall (pressure receiving member)
102 resin

Claims (13)

In an electric compressor that houses a compression mechanism and a motor that drives the compression mechanism in a housing, and includes an inverter that controls driving of the motor in a part of the housing.
The inverter is composed of at least one capacitor mounted on a substrate and other electrical components, and is housed in an inverter case fixed to the housing, and a discharge member facing the capacitor is provided with a gap therebetween. An electric compressor characterized by that.   The electric compressor according to claim 1, wherein a pressure receiving member that receives a pressure generated on the capacitor side when contacting the discharge member is provided around the capacitor.   The electric compressor according to claim 2, wherein the pressure receiving member is an outer wall of an inverter base to which the substrate is attached.   The electric compressor according to claim 2, wherein the pressure receiving member is a resin filled in at least a part of the inverter case.   The electric compressor according to any one of claims 1 to 4, wherein the discharge member is provided in a state of penetrating the inverter case or the housing.   The electric compressor according to any one of claims 1 to 4, wherein the discharge member is provided on an inner wall surface of the inverter case or the housing.   The electric compressor according to any one of claims 1 to 4, wherein the discharge member is provided on an inverter base to which the substrate is attached.   The electric inverter according to any one of claims 1 to 7, wherein the inverter case is integrally formed by combining a plurality of divided case members, and is fixed to a part of the housing. compressor.   The said inverter case is comprised by the at least 1 cover case fixed to the said housing so that the said board | substrate attached to a part of said housing might be covered. The electric compressor according to item 1.   The said capacitor | condenser is comprised by the some electrolytic capacitor mounted in the said board | substrate, and the said discharge member is provided facing each of these electrolytic capacitors, The any one of Claims 1-9 characterized by the above-mentioned. The electric compressor of Claim 1.   The electric compressor according to claim 8, wherein the inverter case is constituted by a case main body and a case cover.   The said discharge member is provided in the state clamped by the sealing member at the junction part of the said case members, or the junction part of the said inverter case and the said housing, The any one of Claims 1-11 characterized by the above-mentioned. The electric compressor according to item.   The electric compressor according to any one of claims 1 to 12, wherein the discharge member has a pointed portion on a side facing the capacitor.