JP5726102B2 - Electric compressor - Google Patents

Description

  The present invention relates to an electric compressor constituting an in-vehicle air conditioner.

  A scroll-type compressor often used in an air conditioner includes a fixed scroll and a turning scroll each having a spiral scroll wall. Then, the orbiting scroll is revolved with respect to the fixed scroll to reduce the volume of the compression chamber formed between both scroll walls, thereby compressing the fluid in the compression chamber.

  In recent years, electric compressors driven by a motor are being used in vehicle air conditioners. In such an electric compressor, in an inverter circuit, a direct current supplied from a battery is converted into an alternating current, and the alternating current is supplied to the motor, so that the motor is rotationally driven to drive the compressor.

  In an air conditioner for a vehicle, space saving is required in order to accommodate each device in the engine room of the vehicle. Therefore, an electric compressor is provided in which a compressor, a motor, and an inverter circuit unit including a capacitor, a coil, an inverter circuit, and the like are integrated (see, for example, Patent Documents 1 and 2).

JP 2003-262187 A Japanese Patent No. 4690769

  However, air conditioners for vehicles are exposed to severe vibration environments due to the effects of vibration input from the road surface during travel, vibration during operation of the engine, compressor, motor, etc., vibration of the travel drive system, etc. It is. In particular, the electric compressor may be directly attached to an engine such as a hybrid car. In this case, the vibration environment becomes more severe.

In such a vibration environment, the electric compressor is required to have high vibration resistance in order to improve reliability. However, the electronic elements constituting the inverter circuit part and these soldered parts may be damaged. Measures are required.
The present invention has been made based on such a technical problem, and an object thereof is to provide an electric compressor capable of obtaining high vibration resistance and reliability.

The present invention based on this object is a scroll type compressor constituting an in-vehicle air conditioner, and includes a housing forming an outer shell of the compressor, and a scroll accommodated in one end side of the housing. A compression mechanism, a motor housed on the other end side in the housing and driving the compression mechanism, and an inverter circuit section for rotating the motor, and a capacitor constituting the inverter circuit section holds the capacitor The pair of flat terminals of the capacitor mounted on the substrate via the holder and the terminal insertion holes formed in the holder and into which the terminals are inserted are arranged in a T shape so as to be orthogonal to each other. Features.
According to such a configuration, the mounting rigidity of the capacitor to the holder can be secured in two directions orthogonal to each other by inserting the pair of flat terminals arranged in a T shape into the terminal insertion holes of the holder. it can.

  According to the present invention, it is possible to increase the mounting rigidity of the capacitor, prevent the terminal itself and the soldered portion of the terminal from being damaged, and obtain high vibration resistance and reliability.

It is a figure which shows the compressor in this Embodiment, and is sectional drawing along the axial direction of the compressor. It is a perspective view which shows an inverter circuit part. It is a perspective developed view which shows the structure of an inverter circuit part. It is a perspective view which shows a capacitor | condenser coil unit. It is a perspective view which shows the holder of a capacitor | condenser and a coil. It is a figure which shows the attachment structure of the capacitor | condenser in 1st embodiment. It is a figure which shows the attachment structure of the capacitor | condenser in a 1st reference example . It is a figure which shows the capacitor | condenser in the 2nd reference example . It is a figure which shows the attachment structure of the capacitor | condenser in the 3rd reference example .

Hereinafter, the present invention will be described in detail based on embodiments shown in the accompanying drawings.
[First embodiment]
FIG. 1 is a diagram for illustrating a basic configuration of an electric compressor (scroll type compressor) 10 according to each embodiment. The configuration shown below is common to each embodiment.
As shown in FIG. 1, the electric compressor 10 includes a scroll-type compression unit (compression mechanism) 30 on one end side of a housing 11 and a motor 20 on the other end side. Further, the housing 11 has an opening 11 a formed at the end on the motor 20 side, and an inverter circuit housing 50 is provided so as to close the opening 11 a, and constitutes a part of the housing 11.

  In the electric compressor 10, the refrigerant is introduced into the housing 11 from a refrigerant suction port (not shown) formed on the side surface of the housing 11 on the side where the motor 20 is provided, and the side (one end) where the compression unit 30 is provided. The refrigerant compressed by the compression unit 30 is discharged from the refrigerant discharge port P2 formed on the end surface of the side.

The motor 20 includes a rotor 21 provided on the main shaft 40 and a stator 22.
The main shaft 40 is rotatably supported by the housing 11 via a main bearing 41 and a sub bearing 42.
The rotor 21 is provided integrally with the main shaft 40 between the main bearing 41 and the sub bearing 42.
The stator 22 is provided to be fixed to the housing 11 so as to face the outer peripheral side of the rotor 21.

The compression unit 30 includes a turning scroll 32 that rotates together with the main shaft 40, and a fixed scroll 33 that is fixed to the housing 11.
In the orbiting scroll 32 and the fixed scroll 33, spiral scroll walls 32b and 33b are erected on one side of the disk-like bases 32a and 33a, respectively. The orbiting scroll 32 and the fixed scroll 33 combine the scroll walls 32b and 33b with each other to form a compression chamber between the scroll walls 32b and 33b.

  The orbiting scroll 32 is provided eccentric with respect to the center of the main shaft 40 by a predetermined dimension. Thus, when the main shaft 40 is rotated around its axis by the motor 20, the orbiting scroll 32 rotates (revolves) with an eccentric dimension as a radius with respect to the center of the main shaft 40. The Oldham ring 35 is interposed between the orbiting scroll 32 and the main shaft 40 so that the orbiting scroll 32 does not rotate while revolving.

The inverter circuit housing 50 includes a bottom plate (partition wall) 50a that closes the opening 11a of the housing 11, and a peripheral wall 50b that rises perpendicularly from the periphery of the bottom plate 50a to the side opposite to the motor 20 side. ing. The inverter circuit housing 50 is fastened to the housing 11 by bolts 53.
A lid 54 can be attached to the opening of the peripheral wall 50b with a screw 55 or the like.

As shown in FIGS. 2 and 3, an inverter circuit portion 60 is accommodated in such an inverter circuit housing 50.
The inverter circuit unit 60 includes a power board 61 on which an inverter element 61a and the like are mounted, a capacitor / coil unit 64 including a capacitor 62 and a coil 63, a control board 65, the power board 61, the capacitor / coil unit 64, And a bus bar 66 for electrically connecting the control board 65.

As shown in FIG. 4, in the capacitor / coil unit 64, a capacitor 62 and a coil 63 are held in a case (holder) 67 made of an insulating material.
As shown in FIG. 5A, the case 67 is formed with a substantially cylindrical coil housing portion 67a, in which a substantially columnar coil 63 is housed. The coil housing portion 67a has lead insertion holes 68 and 69 into which the leads of the coil 63 are inserted and soldered.
A capacitor fixing portion 67b for fixing the capacitor 62 is provided adjacent to the coil housing portion 67a. The capacitor fixing portion 67b is plate-shaped and has terminal insertion holes 72 and 73 into which the flat terminals 70 and 71 of the capacitor 62 are inserted and soldered.

  As shown in FIG. 5B, the case 67 incorporates lead members 74a, 74b, 74c, and 74d having one ends facing the lead insertion holes 68 and 69 and the terminal insertion holes 72 and 73, respectively. The other ends of these lead members 74a, 74b, 74c, and 74d are exposed to the outside of the case 67 and are electrically connected to the power board 61 and the bus bar 66.

  Further, the case 67 is formed with a bracket portion 67c for forming the case 67 on the bottom plate 50a of the inverter circuit housing 50, and the bracket portion 67c is formed with a bolt hole 77. A case 67 is fixed by inserting a bolt (not shown) into the bolt hole 77 and screwing it into a bolt hole formed in the bottom plate 50 a of the inverter circuit housing 50.

Now, in the electric compressor 10 having the basic configuration as described above, as shown in FIG. 6, the capacitor 62A in the present embodiment has a T-shape so that the flat terminal 70A and the flat terminal 71A are orthogonal to each other. Arranged in a shape.
Correspondingly, the terminal insertion holes 72A and 73A formed in the capacitor fixing portion 67b of the case 67 are also arranged in a T shape so that their longitudinal directions are orthogonal to each other.

  With the configuration as described above, the capacitor 62A in which the flat terminals 70A and 71A are inserted into the terminal insertion holes 72A and 73A of the capacitor fixing portion 67b and soldered is arranged so that the flat terminals 70A and 71A are orthogonal to each other. ing. Accordingly, it is possible to ensure mounting rigidity in two directions (X and Y directions in the drawing) perpendicular to each other along the front end surface where the flat terminals 70A and 71A are provided in the capacitor 62A. Therefore, it is possible to prevent the soldered portions and the flat terminals 70A and 71A themselves from being damaged by vibrations and the like, and the reliability thereof can be improved.

Hereinafter, although the reference example of the electric compressor of this invention is demonstrated, since the structure of the electric compressor 10 is common with the above, only a characteristic structure is demonstrated by each reference example .
[ First Reference Example ]
As shown in FIG. 7, in the capacitor 62B in this embodiment, flat terminals 70B and 71B are arranged in parallel to each other, and a dummy terminal (attachment portion) 80 is provided in the vicinity thereof.
Correspondingly, terminal insertion holes 72B and 73B are arranged in parallel with each other in the capacitor fixing portion 67b of the case 67, and an insertion hole 81 for the dummy terminal 80 is formed in the vicinity thereof.

  According to such a configuration, since the capacitor 62B is fixed to the capacitor fixing portion 67b of the case 67 by the dummy terminal 80 in addition to the flat terminals 70B and 71B, the mounting rigidity of the capacitor 62B is increased. Therefore, it is possible to prevent the soldered portion and the flat terminals 70B and 71B themselves from being damaged by vibration or the like.

In this reference example , the dummy terminal 80 can be set to the same potential as the ground side of the flat terminals 70B and 71B.
The dummy terminal 80 may be a simple protrusion and may be made of the same insulating material as the housing of the capacitor 62A.

[ Second Reference Example ]
As shown in FIG. 8, the capacitor 62C in the second reference example is provided with a stay 85 (an attaching portion, a protruding portion) protruding outward on a side surface other than the side facing the capacitor fixing portion 67b. A through hole 86 is formed in 85.
A capacitor 62C is fixed to the inverter circuit housing 50 by inserting a bolt (not shown) into the through hole 86 and screwing it into a bolt hole (not shown) formed in the bottom plate 50a of the inverter circuit housing 50 shown in FIG.
The stay 85 may be fixed to the case 67 instead of the inverter circuit housing 50.
Even in such a configuration, the mounting rigidity of the capacitor 62C is increased. Therefore, it is possible to prevent the soldered portion and the flat terminals 70 and 71 themselves from being damaged by vibration or the like.

[ Third reference example ]
As shown in FIG. 9, the capacitor 62D in the third reference example is provided with a stay (mounting portion, protruding portion) 87 protruding in the same direction as the flat terminals 70, 71 on the side facing the capacitor fixing portion 67b. A through hole 88 is formed in the stay 87.
An insertion hole 89 through which the stay 87 is inserted is formed in the capacitor fixing portion 67b, and the stay 87 projects from one side of the capacitor fixing portion 67b to the other side through the insertion hole 89. .
Then, a bolt (not shown) is inserted into the through hole 88 and fastened together with the capacitor fixing portion 67b, whereby the capacitor 62D is fixed to the case 67.
Even in such a configuration, the mounting rigidity of the capacitor 62D is increased. Therefore, it is possible to prevent the soldered portion and the flat terminals 70 and 71 themselves from being damaged by vibration or the like.

Note that the configuration shown in each of the above embodiments can be appropriately changed within the scope of the gist of the present invention.
For example, the shapes of the capacitors 62A to 62D, the arrangement in the inverter circuit unit 60, and the like are not limited to the above. In the electric compressor 10, the configuration other than the mounting structure of the capacitors 62 </ b> A to 62 </ b> D can be changed to a configuration other than the above as appropriate.
Other than this, as long as it does not depart from the gist of the present invention, it is possible to select the configuration described in the above embodiment, change it to another configuration, or combine each embodiment as appropriate. It is.

DESCRIPTION OF SYMBOLS 10 Electric compressor 11 Housing 20 Motor 30 Compression part (compression mechanism)
40 Spindle 50 Inverter circuit housing 50a Bottom plate 60 Inverter circuit section 61 Power board 62, 62A to 62D Capacitor 63 Coil 64 Capacitor / coil unit 65 Control board 66 Bus bar 67 Case (holder)
67a Coil housing part 67b Capacitor fixing part 67c Bracket part 68 Lead insertion hole 70, 70A, 70B, 71, 71A, 71B Flat terminal 72, 72A, 72B, 73, 73A, 73B Terminal insertion hole 80 Dummy terminal (attachment part)
85, 87 stay (mounting part, protruding part)
89 Insertion hole

Claims (2)

A scroll type electric compressor constituting an in-vehicle air conditioner,
A housing forming an outer shell of the compressor;
A scroll-type compression mechanism housed on one end in the housing;
A motor housed on the other end in the housing and driving the compression mechanism;
An inverter circuit section for rotationally driving the motor,
The capacitor that constitutes the inverter circuit unit is mounted on a substrate through a holder that holds the capacitor,
An electric compressor characterized in that a pair of flat terminals of the capacitor and terminal insertion holes formed in the holder and into which the terminals are inserted are arranged in a T shape so as to be orthogonal to each other. The pair of flat terminals are inserted into the terminal insertion holes and soldered.
The electric compressor according to claim 1 .

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