JP2004019586A - Electric compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric compressor for reducing electromagnetic noise in a wiring passage between an inverter and a capacitor, simplifying a connection work, and preventing occurrence of any defective electric contact or the like. <P>SOLUTION: One end side of a conductive plate 42 connected to a power input side of an inverter 40 extends outward of a compressor body 10, and the conductive plate 42 and a power cable 60 are respectively connected to a terminal 50a of a capacitor 50 disposed outside the compressor body 10. Thus, the capacitor 50 and the inverter 40 need not be connected to each other by other external wire separately from the power cable 60, and the wiring length to the capacitor 50 can be minimized. Further, since a part of a surface of the capacitor 50 is formed flat so as to be brought into surface contact with an outer side of the compressor body 10, the cooling effect of the capacitor 50 with a low-temperature refrigerant in the compressor body 10 can be enhanced. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an electric compressor used for compressing a refrigerant in an air conditioner for a vehicle or the like.
[0002]
[Prior art]
Conventionally, as this type of electric compressor, for example, as described in Japanese Patent Application Laid-Open No. 9-287585, a hollow cylindrical compressor body that sucks and discharges a refrigerant, and a compressor that is sucked into the compressor body 2. Description of the Related Art There is known a so-called scroll-type compression unit that compresses a refrigerant, and a motor that drives the compression unit, and the motor is driven by an inverter.
[0003]
[Problems to be solved by the invention]
By the way, in the electric compressor, a capacitor for power supply smoothing is provided outside the compressor body, and the capacitor is connected in parallel to a power input side of the inverter. In this case, separately from the power cable connected to the inverter, it is necessary to connect the capacitor and the power input terminal of the inverter by a conducting wire.
[0004]
However, since a current including a ripple current flows through the conductive wire, the amount of electromagnetic noise radiated from the external wiring of the conductive wire increases, which has a problem of affecting devices around the compressor. Furthermore, since an electric connection point is required for each of the power cable and the capacitor, the number of electric connection points increases the complexity of the connection work, and the problem of poor electrical contact and disconnection due to the influence of vibration and the like is likely to occur. There were also points.
[0005]
In addition, since the condenser generates heat, the condenser is arranged on the refrigerant suction side of the compressor body and is brought into close contact with the surface of the compressor body, so that the cooling of the condenser is promoted by the low-temperature refrigerant in the compressor body. However, since the condenser is cylindrical, the contact area with the surface of the compressor main body cannot be increased, and a sufficient cooling effect by the refrigerant cannot be obtained. For this reason, it is necessary to increase the surface area of the condenser to enhance the cooling effect by contact with the outside air. However, in order to increase the surface area, the condenser becomes large, and the whole compressor cannot be downsized. was there.
[0006]
SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to reduce electromagnetic noise in a wiring path between an inverter and a capacitor, to simplify connection work and to improve electrical connection. An object of the present invention is to provide an electric compressor capable of preventing occurrence of poor contact or the like. Another object of the present invention is to provide, in addition to the above object, an electric compressor capable of increasing the cooling effect on a condenser and reducing the size of the condenser.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a compressor body having a hollow shape, a compressor for compressing fluid sucked into the compressor body, and a motor for driving the compressor. An inverter for driving the motor, and a power supply smoothing capacitor connected in parallel to the power input side of the inverter, and the capacitor is arranged outside the compressor main body, and the inverter housing is provided inside the compressor main body. In the electric compressor provided, a conductive member electrically connected to a power input side of the inverter and extending to a predetermined position outside the compressor body is provided, and a terminal of the capacitor is provided with a conductive member and a power cable from an external power source. Connected.
[0008]
Thus, since the conductive member and the power cable are respectively connected to the terminals of the capacitor disposed outside the compressor body, it is not necessary to connect the capacitor and the inverter separately from the power cable by another external wiring.
[0009]
According to a second aspect of the present invention, in the electric compressor according to the first aspect, a fastening unit for fastening a connection fitting of the conductive member and the power cable to a terminal of the capacitor is provided.
[0010]
Accordingly, in addition to the function of the first aspect, the connection member of the conductive member and the power cable is connected to the capacitor by the common fastening means.
[0011]
According to a third aspect, in the electric compressor according to the first or second aspect, the capacitor is formed in a flat shape such that a part of its surface is in surface contact with the outer surface of the compressor body.
[0012]
Accordingly, in addition to the operation of the first or second aspect, a part of the surface of the condenser comes into surface contact with the outer surface of the compressor main body, so that the heat transfer area between the condenser and the compressor main body increases.
[0013]
According to a fourth aspect, in the electric compressor according to the first, second, or third aspect, the conductive member is formed integrally with an insulating member disposed in the compressor body.
[0014]
Accordingly, in addition to the function of the first, second, or third aspect, since the conductive member is formed integrally with the insulating member, it is not necessary to separately assemble only the conductive member to the compressor body.
[0015]
According to a fifth aspect of the present invention, in the electric compressor according to the fourth aspect, an opening for inserting a conductive member is provided on a side surface of the compressor body, and the opening is closed by a part of the insulating member. Has formed.
[0016]
Thus, in addition to the function of the fourth aspect, since the opening of the compressor body is closed by a part of the insulating member, there is no need to separately perform insulation treatment around the conductive member.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
1 to 4 show one embodiment of the present invention. FIG. 1 is a side sectional view of an electric compressor, FIG. 2 is a front view thereof, FIG. 3 is a bottom view of main parts thereof, and FIG. It is a front view.
[0018]
The electric compressor includes a compressor body 10 that sucks and discharges a refrigerant, a compressor 20 that compresses the refrigerant sucked into the compressor body 10, a motor 30 that drives the compressor 20, and a motor 30 that drives the motor 30. And a power supply smoothing capacitor 50 connected in parallel to the power supply input side of the inverter 40.
[0019]
The compressor body 10 is formed in a cylindrical shape and includes a suction side housing 11, an intermediate housing 12, and a discharge side housing 13. The suction side housing 11 is connected to one end of the intermediate housing 12, and a side face thereof is provided with a refrigerant suction port 11a. The inside of the suction side housing 11 is partitioned into one end side and the other end side by a partition wall 11b, and a housing portion 11c for housing the inverter 40 is formed at one end side. One end surface of the housing portion 11c is open, and this opening portion is closed by a closing plate 14. A bearing 11d for supporting one end of the motor 30 is provided at the center of the partition wall 11b. The intermediate housing 12 is connected to one end of the discharge-side housing 13, and a bearing 12 a that supports the other end of the motor 30 is provided inside the intermediate housing 12. The discharge-side housing 13 communicates with the suction-side housing 11 via the inside of the intermediate housing 12, and a refrigerant discharge port 13a is provided on the other end surface.
[0020]
The compression unit 20 includes a fixed scroll member 21 disposed on the other end side in the discharge side housing 13 and a movable scroll member 22 disposed on one end side of the fixed scroll member 21. With this, it is fixed to the discharge side housing 13. A spiral body 21 a is provided on one end surface of the fixed scroll member 21, and a through hole 21 b communicating with the discharge port 13 a of the discharge side housing 13 is provided substantially at the center of the fixed scroll member 21. A scroll 22a is provided on one end of the movable scroll member 22, and a boss 22b extending toward the motor 30 is provided on the other end. Further, a rotation preventing mechanism 24 is provided between the movable scroll member 22 and the intermediate housing 12, and the rotation preventing mechanism 24 causes the movable scroll member 22 to perform a predetermined orbital movement in which rotation is prevented. .
[0021]
The motor 30 is a well-known three-phase AC brushless motor, and is arranged in the compressor body 10. The motor 30 includes a rotating shaft 31 extending in the cylinder axis direction of the compressor body 10, a rotor 32 composed of a permanent magnet attached to the rotating shaft 31, windings 33 disposed around the rotor 32, and windings 33. And a cylindrical stator 34 that holds Each winding 33 is arranged in the circumferential direction of the stator 34, and the rotor 32 is arranged inside the stator 34.
[0022]
One end of the rotating shaft 31 is rotatably supported by a bearing 11d of the suction side housing 11 via a roller bearing 31a, and the other end is rotatably supported by a bearing 12a of the intermediate housing 12 via a ball bearing 31b. I have. An eccentric pin 31c eccentric with respect to the rotating shaft 31 protrudes from the other end surface of the rotating shaft 31, and the eccentric pin 31c is inserted into the eccentric bush 35. The eccentric bush 35 is rotatably supported by the boss 22b of the movable scroll member 22 via a roller bearing 35a.
[0023]
The inverter 40 includes a well-known circuit that variably controls the number of revolutions of the motor 30, is disposed in the housing portion 11c of the suction side housing 11, and is held by an insulating member 41 fixed to the partition wall 11b. The insulating member 41 is made of a synthetic resin and is integrally formed with a pair of conductive plates 42 connected to the capacitor 50. Further, a side wall 41a extending along the side surface of the suction side housing 11 is provided on one end side (the conductive plate 42 side) of the insulating member 41, and the side wall portion 41a is provided with an opening 11e provided on the side surface of the suction side housing 11. It is formed so as to close. In this case, the opening 11 e is formed up to one end opening of the suction-side housing 11 so as to cut out a part of the suction-side housing 11 in the circumferential direction. One end of each conductive plate 42 is formed so as to extend from the insulating member 41 to the outside of the compressor body 10, and is provided with a screw insertion hole 42 a for connecting to the capacitor 50. The other end of each conductive plate 42 is connected to the power input side of the inverter 40. A conductive plate 43 connected to the output side of the inverter 40 is provided integrally with the insulating member 41, and this conductive plate 43 is connected to a terminal 41 attached to the partition wall 11 b of the suction side housing 11. The terminal 41 is connected to each winding 33 of the motor 30 via a conductor (not shown).
[0024]
The condenser 50 is disposed outside the compressor body 10, and a part of the surface thereof is in close contact with the suction side housing 11 and the intermediate housing 12. That is, the upper surface and the lower surface of the capacitor 50 are formed in a flat and flat shape, and the capacitor 50 is mounted so that the upper surface thereof comes into surface contact with the surfaces of the housings 11 and 12. In this case, the mounting plate 51 is in surface contact with the lower surface of the capacitor 50, and the mounting plate 51 is fixed to the intermediate housing 12 by a plurality of screws 51a. A pair of terminals 50a is provided at one end of the capacitor 50, and a screw 50b is attached to each terminal 50a. That is, each conductive plate 42 of the inverter 40 is connected to each terminal 50a, and each conductive plate 42 is fastened to each terminal 50a by a screw 50b inserted through the hole 42a.
[0025]
In the electric compressor configured as described above, when the motor 30 rotates, the movable scroll member 22 of the compression unit 20 performs a predetermined orbiting motion by the rotation of the eccentric bush 35. Thereby, the refrigerant flowing into the suction side housing 11 from the suction port 11a of the compressor body 10 flows through the gap of the motor 30 and the like, and the refrigerant 22a of the movable scroll member 22 and the spiral body 21a of the fixed scroll member 21 The air is sucked in between, and compressed between the spiral bodies 21a and 22a, and is discharged from the discharge port 13a of the compressor body 10. The compression operation of each of the spiral bodies 21a and 22a in the scroll compressor according to the present embodiment is the same as that of the well-known structure, and therefore detailed description is omitted.
[0026]
Further, in the electric compressor, a power cable 60 from an external power source is connected to each terminal 50a of the capacitor 50, and the power of the power cable 60 is connected to each terminal 50a of the capacitor 50 via each conductive plate 42 connected to each terminal 50a. Is input to the inverter 40. At this time, the connection fitting 61 of each power cable 60 is fastened to each terminal 50a of the capacitor 50 together with each conductive plate 42 by a screw 50b.
[0027]
Furthermore, since the condenser 50 is arranged on the refrigerant suction side of the compressor main body 10, it is cooled by heat conduction with the low-temperature refrigerant drawn into the compressor main body 10. At this time, since the condenser 50 is formed in a flat shape so as to be in surface contact with the surface of each of the housings 11 and 12, the heat transfer area between the condenser 50 and each of the housings 11 and 12 is increased.
[0028]
As described above, according to the electric compressor of the present embodiment, the conductive plate 42 connected to the power input side of the inverter 40 is formed such that one end thereof extends to the outside of the compressor body 10. Since the conductive plate 42 and the power cable 60 are respectively connected to the terminals 50a of the capacitor 50 disposed outside, there is no need to connect the capacitor 50 and the inverter 40 separately from the power cable 60 by another external wiring. The wiring length to the capacitor 50 can be minimized. Therefore, the amount of electromagnetic noise generated from such external wiring can be significantly reduced, and the influence of the electromagnetic noise on peripheral devices can be reduced.
[0029]
Furthermore, since the electrical connection point between the capacitor 50 and the power cable 60 is only at the connection point with the conductive plate 42, the number of electrical connection points can be reduced. Thereby, the connection operation can be simplified, and it is also effective in preventing the occurrence of poor electrical contact or disconnection due to the influence of vibration or the like. In addition, a dedicated connection component such as a connector is not required, and the cost can be reduced by reducing the number of components. Further, since the connection fitting 61 of the power cable 60 and the conductive plate 42 can be jointly fastened by the screw 50b as a fastening means, the connection can be easily and securely performed.
[0030]
Further, since the condenser 50 is formed in a flat shape such that a part of its surface is in surface contact with the outer surface of the compressor body 10, the heat transfer area with the compressor body 10 can be increased, and the The cooling effect of the condenser 50 by the low-temperature refrigerant inside can be enhanced. Therefore, it is not necessary to increase the surface area of the condenser 50 in order to enhance the cooling effect by the outside air, and the condenser 50 can be reduced in size accordingly, and the compressor as a whole can be reduced in size.
[0031]
Further, since the conductive plate 42 is formed integrally with the insulating member 41 disposed in the compressor main body 10, it is not necessary to separately assemble the conductive plate 42 alone in the compressor main body 10, thereby reducing the number of assembly steps. it can.
[0032]
Further, an opening 11e through which the conductive plate 42 is inserted is provided on the side surface of the compressor body 10, and the opening 11e is closed by a side wall 41a provided on the insulating member 41. There is no need to separately perform insulation treatment around the penetrating conductive plate 42, and the assemblability can be improved.
[0033]
5 to 7 show another embodiment of the present invention. FIG. 5 is a side sectional view of the electric compressor, FIG. 6 is a front view thereof, and FIG. 7 is a bottom view of main parts thereof.
[0034]
In the above-described embodiment, the opening 11e cut to the one end opening of the compressor body 10 is closed by the side wall 41a of the insulating member 41. However, in the present embodiment, the suction side housing 11 A long hole-like opening 11f extending in the circumferential direction is provided on the side surface of the insulating member 44, and the opening 11f is closed by a part of the insulating member 44.
[0035]
That is, a protruding portion 44a that fits into the opening 11f is provided on one end side (the conductive plate 42 side) of the insulating member 44, and the protruding portion 44a is formed so as to close the opening 11f of the suction-side housing 11. I have.
[0036]
According to the present embodiment, similarly to the above-described embodiment, there is no need to separately perform insulation treatment around the conductive plate 42 that penetrates the wall surface of the compressor body 10, so that the assemblability can be improved.
[0037]
【The invention's effect】
As described above, according to the electric compressor of the first aspect, it is not necessary to connect the capacitor and the inverter by another external wiring separately from the power cable, so that the wiring length with the capacitor is minimized. Can be. Therefore, the amount of electromagnetic noise generated from such external wiring can be significantly reduced, and the influence of the electromagnetic noise on peripheral devices can be reduced. Further, since the number of electrical connection points is reduced, the connection operation can be simplified, and it is also effective in preventing the occurrence of poor electrical contact and disconnection due to the influence of vibration and the like. Furthermore, a dedicated connection component such as a connector is not required, and the cost can be reduced by reducing the number of components.
[0038]
According to the electric compressor of the second aspect, in addition to the effect of the first aspect, the connection fitting of the power cable and the conductive member can be fastened together, so that the connection can be easily and reliably performed.
[0039]
According to the electric compressor of the third aspect, in addition to the effect of the first or second aspect, the heat transfer area between the condenser and the compressor main body can be increased, so that the condenser using the low-temperature refrigerant in the compressor main body. Cooling effect can be enhanced. As a result, the size of the condenser can be reduced, and the size of the entire compressor can be reduced.
[0040]
According to the electric compressor of the fourth aspect, in addition to the effects of the first, second or third aspect, it is not necessary to separately assemble only the conductive member to the compressor body, so that the number of assembling steps can be reduced. .
[0041]
According to the electric compressor of the fifth aspect, in addition to the effect of the fourth aspect, it is not necessary to separately perform insulation treatment around the conductive member, so that the assemblability can be improved.
[Brief description of the drawings]
FIG. 1 is a side sectional view of an electric compressor showing one embodiment of the present invention. FIG. 2 is a front view of the electric compressor. FIG. 3 is a bottom view of a main part of the electric compressor. FIG. FIG. 5 is a side sectional view of an electric compressor showing another embodiment of the present invention. FIG. 6 is a front view of the electric compressor. FIG. 7 is a bottom view of a main part of the electric compressor.
DESCRIPTION OF SYMBOLS 10 ... Compressor main body, 11e ... Opening part, 20 ... Compression part, 30 ... Motor, 40 ... Inverter, 41 ... Insulating member, 42 ... Conductive plate, 44 ... Insulating member, 50 ... Capacitor, 50a ... Terminal, 50b ... Screw , 60 ... power cable, 61 ... connection fitting.

Claims (5)

A compressor body formed in a hollow shape, a compression section for compressing fluid sucked into the compressor body, a motor for driving the compression section, an inverter for driving the motor, and a power input side of the inverter in parallel with the inverter. A power supply smoothing capacitor connected to the compressor, and the capacitor is arranged outside the compressor body, and the compressor body has an inverter storage unit provided in the compressor.
A conductive member electrically connected to a power input side of the inverter and extending to a predetermined position outside the compressor body;
An electric compressor wherein a conductive member and a power cable from an external power supply are respectively connected to terminals of the capacitor. 2. The electric compressor according to claim 1, further comprising fastening means for fastening the connection member of the conductive member and the power cable to a terminal of the capacitor. 3. The electric compressor according to claim 1, wherein the capacitor is formed in a flat shape such that a part of the surface thereof is in surface contact with the outer surface of the compressor body. 4. The electric compressor according to claim 1, wherein the conductive member is formed integrally with an insulating member arranged in the compressor body. Providing an opening for inserting a conductive member on a side surface of the compressor body,
The electric compressor according to claim 4, wherein the insulating member is formed so as to close the opening with a part thereof.

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