JP2013177826A - Electric compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inverter integrated electric compressor having easiness of manufacture and capable of preventing emission of noise to environment.SOLUTION: An electric compressor 10 includes an inverter housing part 14 for housing an inverter device for supplying drive power to an electric motor 20 at an outer periphery of a housing 11 where the electric motor 20 and a compressing mechanism 30 are housed. The inverter housing part 14 includes an inverter box 15 having a housing chamber and an inverter cover 16 which covers an opening of the inverter box 15, and a rib 16c is provided at a back face of the inverter cover 16 facing the housing chamber.

Description

  The present invention relates to an electric compressor used for 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, an electric compressor driven by an electric motor is being used in an air conditioner for a vehicle. In such an electric compressor, in the inverter device, the direct current supplied from the battery is converted into an alternating current, and the alternating current is supplied to the electric motor, so that the electric 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. Then, the electric compressor assembled | attached to the housing in which the compressor, the electric motor, and the inverter apparatus were integrated is provided (for example, patent document 1). The inverter-integrated electric compressor includes a storage chamber that stores the inverter device, and the opening is closed with a lid. This lid is generally composed of a relatively thin plate-like member. However, when the inverter device is driven, intense vibration is generated and propagates to the lid, so that the vibration is amplified by a so-called Tyco phenomenon and is easily dissipated as noise to the surroundings.

JP 2010-59941 A

Patent Literature 1 proposes that a lid that closes the opening of the inverter housing portion is made of a damping steel plate to prevent vibration to the surroundings and noise from being diffused.
However, if the lid has a relatively simple flat shape, it is easy to use the vibration-damping steel plate, but if not, considerable processing is required, and it is not practical to use the vibration-damping steel plate. Moreover, the damping steel plate is expensive. Therefore, in consideration of manufacturability and cost that can cope with various shapes, it is preferable that the lid is manufactured by casting.
The present invention has been made based on such a problem, and an object thereof is to provide an inverter-integrated electric compressor that is easy to manufacture and that can prevent noise from being diffused to the surroundings.

An inverter-integrated electric compressor according to the present invention, which is based on this object, has an inverter housing portion that houses an inverter device that supplies driving power to an electric motor on the outer periphery of a housing in which the motor and the compression mechanism are housed. Prepare.
The inverter accommodating part by this invention is equipped with the accommodating main body provided with an accommodating chamber, and the lid | cover which closes the opening of an accommodating main body, and the rib is provided in the back surface of the lid | cover facing an accommodating chamber.
The electric compressor of the present invention suppresses vibration of the lid by providing ribs to increase the rigidity of the lid. Further, since the rib can be integrally manufactured together with the lid by die casting, the manufacturing is easy and the cost is hardly increased.

  In the electric compressor of the present invention, when the housing main body and the lid are fastened and fixed by a plurality of fasteners and a plurality of bosses for the fasteners are provided on the lid, it is preferable that at least one end of the rib is connected to the boss. The portion where the boss is provided has higher rigidity than the other portions. By connecting the rib to this highly rigid boss, the vibration damping effect by providing the rib can be improved. The improvement of the vibration damping effect becomes significant by connecting the opposing bosses with ribs, that is, connecting both ends of the ribs to the bosses.

  In the electric compressor of the present invention, when a plurality of ribs are provided, the plurality of ribs can be provided so as to intersect each other. When the ribs cross each other, the vibration damping effect can be further improved by holding one side and the other side.

  According to the electric compressor of the present invention, vibration of the lid is suppressed by providing a rib to increase the rigidity of the lid. Further, since the rib can be integrally manufactured together with the lid by die casting, the manufacturing is easy and the cost is hardly increased.

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 top view which shows the inside of an inverter box. It is a top view which shows an inverter cover from the top plate side. It is a top view which shows the other example of an inverter cover. It is a top view which shows the other example of an inverter cover. It is a figure explaining the action position of the load at the time of fastening and fixing an inverter cover to an inverter box.

Hereinafter, the present invention will be described in detail based on embodiments shown in the accompanying drawings.
As shown in FIG. 1, the electric compressor 10 includes a housing 11 that forms an outline thereof. The housing 11 includes a compressor side housing 12 that houses a scroll type compression mechanism 30, an electric motor side housing 13 that houses an electric motor 20, and an inverter housing portion 14 that houses an inverter device (not shown). These housing components are manufactured by die casting an aluminum alloy.

  The electric compressor 10 has a refrigerant introduced into the housing 11 from a refrigerant suction port (not shown) formed on the side surface of the motor-side housing 13, and from a refrigerant discharge port P2 formed on the end surface of the compressor-side housing 12. The refrigerant compressed by the compression mechanism 30 is discharged.

The electric motor 20 includes a rotor 21 and a stator 22 that are integrally provided on the main shaft 40. The electric compressor 10 is characterized in that a rotor 21 is disposed around a stator 22.
The rotor 21 is composed of a laminated body in which electromagnetic steel plates each having a slit for accommodating a permanent magnet are laminated, and a permanent magnet disposed in the slit of the laminated body (electromagnetic steel plate), which is the same as in the known art. It is. A shaft hole 21 a penetrating in the axial direction is formed around the axis of the rotor 21. The motor side shaft 40a of the main shaft 40 passes through the shaft hole 21a.
The rotor 21 is fixed to the main shaft 40 (motor-side shaft 40a) by press-fitting or other methods, thereby rotating the main shaft 40 integrally.

  The stator 22 is disposed around the rotor 21. The stator 22 has a general configuration in which a coil is wound, and has a cylindrical appearance. The stator 22 is press-fitted into the motor-side housing 13 and fixed by other methods. Inside the stator 22, the rotor 21 is arranged with a minute interval.

  The main shaft 40 is rotatably supported by the housing 11 via a main bearing 41 and a sub bearing 42. The main bearing 41 supports the journal portion 40b of the main shaft 40 having a large diameter, and the sub bearing 42 supports the motor side shaft 40a. The rotor 21 is assembled integrally with the main shaft 40 between the main bearing 41 and the sub bearing 42.

The compression mechanism 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 provided upright on one side of the disk-like end plates 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 35 between the scroll walls 32b and 33b.

At the end (one end) of the main shaft 40 on the compression mechanism 30 side, an eccentric shaft 40c is formed to protrude from the central axis of the main shaft 40 by a predetermined dimension. The orbiting scroll 32 is rotatably held on the eccentric shaft 40 c via a drive bush 44 and a drive bearing 45. Thereby, the orbiting scroll 32 is eccentric by a predetermined dimension with respect to the center of the main shaft 40, and when the main shaft 40 rotates around its axis, the orbiting scroll 32 is eccentric with respect to the center of the main shaft 40. Rotate (revolution) with a radius. Thereby, the volume of the compression chamber 35 decreases and the refrigerant is compressed. The Oldham ring 36 is interposed between the orbiting scroll 32 and the main shaft 40 so that the orbiting scroll 32 does not rotate while revolving.
In addition, a balancer 46 is provided between the orbiting scroll 32 and the main shaft 40 in order to eliminate unbalance due to the orbiting scroll 32 eccentric to the main shaft 40.

Now, the inverter accommodating portion 14 includes an inverter box (accommodating body) 15 and an inverter cover (lid) 16. The inverter box 15 has a box shape with one opening, and an inverter device (not shown) is accommodated therein. The inverter device controls the power supplied to the electric motor 20. The opening end of the inverter box 15 is sealed by the inverter cover 16, and the bottom plate 15 f of the inverter box 15 facing the inverter cover 16 closes the opening by contacting the motor-side housing 13. The inverter box 15 is fixed to the motor-side housing 13 by bolts B1, and the inverter cover 16 is fixed to the inverter box 15 by bolts B2.
A boss 17 that supports the sub-bearing 42 is formed on the bottom plate 15 f of the inverter box 15 toward the electric motor 20. The sub bearing 42 rotatably supports the main shaft 40 (motor side shaft 40a) while being supported and fixed by the boss 17.

In FIG. 2, the top view which looked at the inverter box 15 from the opening side is shown.
The inverter box 15 includes a side wall 15a rising in the axial direction of the electric compressor 10, a storage chamber 15c provided inside the side wall 15a, and bosses 15d provided at a plurality of locations along the side wall 15a. Each boss 15d is formed with a screw hole 15e into which the bolt B2 is screwed. The inverter cover 16 placed on the top surface 15b of the side wall 15a is fastened and fixed to the side wall 15a with the bolt B2, thereby hermetically sealing the accommodation chamber 15c.

In the present embodiment, the bosses 15d are provided in a total of eight locations, and the numbers (Nos. 1 to 8) shown in FIG. The number of the bosses 15d provided is merely an example.
The boss 15d is provided on the inner side of the side wall 15a of the inverter box 15, and protrudes toward the accommodation chamber 15c. This is because an unnecessary protruding portion is not provided on the outer periphery of the inverter box 15. However, No. 4 and No. 8 bosses 15d are provided outside the side wall 15a. This is due to the following reason. Assume that the boss 15d of No. 4 is provided inside the side wall 15a as shown in FIG. If the inverter cover 16 is fastened and fixed by the bolt B2 at the No. 3 boss 15d and the No. 4 boss 15d, the load generated between the No. 3 boss 15d and the No. 4 boss 15d by tightening is as follows. , the center of the boss 15d and No.4 boss 15d of No.3, namely acting along the line of action _{L 2} connecting the centers of two bolts B2. However this action line L ₂ are offset from the top surface 15b of the side wall 15a as shown in FIG. 6 (B), the surface pressure is sufficiently obtained between the inverter box 15 and the top surface 15b by tightening the bolt B2 I can't.

On the other hand, in the case of this embodiment in which the No. 3 bosses 15d are alternately arranged on the inner side of the side wall 15a and the No. 4 bosses 15d on the outer side of the side wall 15a, as shown in FIG. boss 15d and the action line _{L 1} connecting the center of the boss 15d of No.4 .3 crosses the top surface 15b of the side wall 15a. Therefore, since the surface pressure between the inverter cover 16 and the top surface 15b due to the tightening force by the bolt B2 can be increased, the sealing performance of the inverter box 15 and the inverter cover 16 can be improved.
Therefore, according to this embodiment, since the airtight state inside the inverter accommodating portion 14 is kept high, it is possible to prevent damage caused by moisture and other substances that are desired to avoid intrusion.

  Next, on the top plate 16a of the inverter cover 16 facing the storage chamber 15c in a state of being mounted on the inverter box 15, as shown in FIG. 3, a seat surface 16b attached to the top surface 15b of the inverter box 15 is provided. It is formed along the periphery. The seat surface 16b protrudes from the top plate 16a by a minute amount. Boss 16d is provided at a plurality of locations along the seat surface 16b. Each boss 16d corresponds to the boss 15d of the inverter box 15. In order to fasten and fix the inverter cover 16 to the inverter box 15 with the bolt B2, the corresponding boss 15d and the boss 16d are aligned, and the screw hole 16e is aligned. , 15e, and bolt B2 is screwed in.

The inverter cover 16 has a plurality of ribs 16c formed on the top plate 16a. The rib 16 c is a characteristic part of the electric compressor 10, and the rib 16 c suppresses the noise from the inverter cover 16 by suppressing the vibration of the inverter cover 16. That is, if the top plate 16a is flat, the inverter cover 16 fixed to the inverter box 15 may cause a drumming phenomenon as the inverter device is driven. On the other hand, providing the rib 16c increases the rigidity of the top plate 16a and suppresses the occurrence of vibration.
The rib 16c connects the two bosses 16d and the boss 16d. Since the portion provided with the boss 16d has higher rigidity than the seat surface 16b without the boss 16d, the effect obtained by providing the rib 16c becomes remarkable.
The form which provides the rib 16c is arbitrary. As shown in FIG. 3, each rib 16c can be provided so as not to be engaged with other ribs 16c (except around the boss 16d as a starting point), or as shown in FIG. It can also be provided.
Further, the rib 16c is not limited to a linear shape, and may include a curved portion (circle) as shown in FIG. Moreover, as shown in FIG. 5, the circular rib 16c connected indirectly to the boss | hub 16d can be provided by connecting the some linear rib 16c.
The rib 16c described above shows an example in which both ends are connected to the opposite boss 16d. This is a preferred embodiment, and in the present invention, only one end may be connected to the boss 16d, or both ends may be connected to the seat surface 16b without being connected to the boss 16d.
In addition, the inverter cover 16 provided with the rib 16c as described above can be manufactured without any special work by integral molding by die casting.

In the electric compressor 10 configured as described above, the low-pressure refrigerant gas after circulating through the refrigeration cycle is sucked into a motor-side housing 13 from a refrigerant suction port (not shown), and is circulated and compressed in the motor-side housing 13. It is sucked into the mechanism 30. The refrigerant gas compressed by the compression mechanism 30 to become high temperature and pressure is circulated from the refrigerant discharge port P2 provided at the end of the compressor side housing 12 to the refrigeration cycle through the discharge pipe.
In this process, when electric power is supplied to the electric motor 20 while being controlled by an inverter device (not shown), the rotor 21 is rotationally driven. Then, the main shaft 40 fixed to the rotor 21 is rotationally driven integrally with the rotor 21 and the orbiting scroll 32 performs the orbiting motion. The main shaft 40 has a journal portion 40b whose diameter is larger than that of the other portion, is supported by the main bearing 41, and the motor-side shaft 40a is supported by the sub-bearing 42 held inside the stator 22, Driven by rotation.

The inverter device operates to generate vibration, but the top plate 16a of the inverter cover 16 is formed with a plurality of ribs 16c on the back side, so that noise radiated to the surroundings through the inverter cover 16 is reduced. Can be reduced.
Moreover, since the No. 3 boss 15d is arranged inside the side wall 15a and the No. 4 boss 15d is arranged outside the side wall 15a, the airtightness in the inverter accommodating portion 14 can be maintained at a high level. The risk of the inverter device losing its function due to flooding is extremely low.

In the said embodiment, although the inverter accommodating part 14 demonstrated the example which applied this invention to the electric compressor 10 arrange | positioned coaxially with the compression mechanism 30 and the electric motor 20, this is an example to the last, an inverter accommodating part The present invention can be applied to an inverter-integrated electric compressor 14 provided on the side of the electric motor 20.
In the above-described embodiment, the scroll type compression mechanism 30 has been described. However, this is only an example, and an electric motor provided with a rotary type compression mechanism or a multistage type compression mechanism that combines a scroll type and a rotary type. The present invention can be applied to a compressor.
In addition to this, as long as it does not depart from the gist of the present invention, the configuration described in the above embodiment can be selected or changed to another configuration as appropriate.

DESCRIPTION OF SYMBOLS 10 Electric compressor 11 Housing 12 Compressor side housing 13 Electric motor side housing 14 Inverter accommodating part 15 Inverter box 15a Side wall 15b Top surface 15c Accommodating chamber 15d Boss 15e, 16e Screw hole 16 Inverter cover 16a Top plate 16b Seat surface 16c Rib 16d Boss 17 boss 20 motor 21 rotor 21a the shaft hole 22 stator 30 compression mechanism 32 orbiting scroll 33 fixed scroll 35 compression chamber 40 spindle 40a motor-side shaft 40b journal portion 40c eccentric shaft 41 main bearing 42 sub bearing B1, B2 bolt _L 1, _{L 2} Line of action

Claims (3)

On the outer periphery of the housing in which the electric motor and the compression mechanism are accommodated, an inverter accommodating portion that accommodates an inverter device that supplies driving electric power to the electric motor,
The inverter accommodating portion includes an accommodating main body including an accommodating chamber and a lid that closes an opening of the accommodating main body, and a rib is provided on a back surface of the lid facing the accommodating chamber.
An electric compressor characterized by that. The housing main body and the lid are fastened and fixed by a plurality of fasteners, a plurality of fastener bosses are provided on the lid, and at least one end of the rib is connected to the boss.
The electric compressor according to claim 1. A plurality of the ribs are provided crossing each other;
The electric compressor according to claim 1 or 2.

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