JP2001304127A - Motor-driven compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor-driven compressor capable of inexpensively realizing the prevention of the lowering of the refrigerant suction efficiency of a compressing mechanism caused by the cooling of a motor, the reduction of specific volume of the refrigerant, and the viscosity resistance of the lubricating oil. SOLUTION: The compressing mechanism is mounted in a case, and the compressing mechanism and an electric motor 21 mounted in a motor chamber 15 of the case are connected in a state that the motive power can be transmitted by a driving shaft 17. A shaft inner hole 17A is formed on the driving shaft 17, and a first branched hole 17B is formed to communicate the shaft inner hole 17A with the motor chamber 15. The shaft inner hole 17A is communicated to a suction chamber 31 through a second collection hole 13F, a collection chamber 13D and a suction communication hole 13G formed on a cylinder block 13. Whereby a part of the refrigerant sucked in the case is introduced into the compressing mechanism through a gap between a stator 19 and a rotor 20, and the remained refrigerant is introduced into the compressing mechanism without used in the cooling of the electric motor 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric compressor, and more particularly, to an electric compressor having a compression mechanism for compressing a refrigerant in a case and an electric motor for driving the compression mechanism.

[0002]

2. Description of the Related Art An electric compressor is known as a compressor incorporated in a refrigerant circulation circuit of a heat exchange device such as a vehicle air conditioner. Generally, an electric compressor is provided with an electric motor and a refrigerant compression mechanism driven by the motor in a case serving as an outer shell thereof. Since the motor is required to have a rotation capability for achieving high rotation and a driving force capable of withstanding a high load torque, the compressor needs to be provided with a high-output motor. However, in a configuration in which a high-output motor is used to withstand a high rotational load, the heat generation of the motor is promoted, and the ambient temperature of the motor is further increased. This increase in the ambient temperature naturally raises the temperature of the motor itself, so that there is a risk of a reduction in rotational efficiency caused by demagnetization of the motor itself due to the increase in the temperature. Therefore, it is possible to adopt a configuration in which the refrigerant sucked into the case is introduced into a motor chamber in which the motor is disposed, and after cooling the motor with the refrigerant, the refrigerant is introduced into the refrigerant compression mechanism. is there.

However, in this configuration, since the refrigerant introduced into the motor chamber is heated by the motor, the refrigerant introduced into the refrigerant compression mechanism in a state where the specific volume has increased is circulated through the refrigerant circulation circuit. There is a problem that the circulation amount is reduced and the cooling capacity is reduced. When the refrigerant cools the motor, the refrigerant often passes through a small gap between the stator and the rotor of the motor. In this case, the refrigerant is included in the refrigerant. There is a problem that the flow resistance due to the viscosity of the atomized lubricating oil deteriorates the flow of the refrigerant.

In Japanese Patent Application Laid-Open No. 9-236092, two inlets for sucking refrigerant are provided in a compressor case, and one of the inlets is provided on the wall of the motor chamber (part of the case). A configuration in which the refrigerant compression mechanism is disposed on the side opposite to the refrigerant compression mechanism with the motor interposed therebetween is disclosed. According to this configuration, part of the refrigerant sucked into the compressor case is sucked through the former suction hole, and the rest is sucked through the latter suction hole. The refrigerant sucked into the case from the former suction hole is introduced into the refrigerant compression mechanism with almost no cooling of the motor. Further, the refrigerant sucked from the latter suction hole is introduced into the refrigerant compression mechanism after cooling the motor. As a result, all the refrigerant introduced into the refrigerant compression mechanism does not pass through the motor, and both of the above-mentioned problems can be improved.

[0005]

However, in order to provide a plurality of suction holes in the compressor case, it is necessary to provide a plurality of seal members for isolating pressure, and the cost is increased due to an increase in the number of processing locations. There were problems in terms of surface and reliability.

SUMMARY OF THE INVENTION An object of the present invention is to provide an inexpensive and highly reliable electric compressor which can achieve a motor cooling, a reduction in the specific volume of a refrigerant, and a reduction in refrigerant suction efficiency of a compression mechanism due to a viscous resistance of lubricating oil. To provide.

[0007]

In order to solve the above-mentioned problems, the invention according to the first aspect is directed to a compression mechanism for compressing a refrigerant in a case, and a stator disposed in a motor chamber of the case. And an electric motor having a rotor, and a drive shaft connected to the rotor and transmitting the rotational driving force of the electric motor to the compression mechanism, and introducing the refrigerant sucked into the case into the compression mechanism. The motor chamber and a drive shaft refrigerant passage formed in the drive shaft, and a part of the suction refrigerant is introduced into the compression mechanism through a gap between the stator and the rotor. In addition, another part of the suction refrigerant is introduced into the compression mechanism through the refrigerant passage in the drive shaft without passing through a gap between the stator and the rotor.

According to the present invention, a part of the refrigerant sucked into the case is introduced into the compression mechanism through the gap between the stator and the rotor of the electric motor. That is, the whole of the suction refrigerant does not pass through the high-temperature gap. That is, the refrigerant introduced into the compression mechanism is hardly heated as a whole, and the temperature of the refrigerant is hardly increased. Therefore, an increase in the specific volume of the refrigerant introduced into the compression mechanism is suppressed, and a decrease in the compression efficiency of the compression mechanism is suppressed. Further, in a case where mist-like lubricating oil for lubricating the inside of the case is mixed in the refrigerant, the lubrication generated when the refrigerant passes through a narrow gap between the stator and the rotor. Resistance due to oil viscosity is reduced. In addition, since the flow rate of the refrigerant passing through the gap between the stator and the rotor can be adjusted by providing the passage in the drive shaft, a plurality of inlets for sucking the refrigerant into the case are provided at the plurality of locations. There is no need to adjust the refrigerant flow rate.

According to a second aspect of the present invention, in the first aspect of the present invention, a drive shaft bearing for rotatably supporting the drive shaft on the case and a part or all of the compression mechanism are provided in the suction path. The point is that at least one of the two is provided with a mechanism bearing for supporting the first bearing.

According to the present invention, at least one of the drive shaft bearing and the mechanical bearing can be favorably cooled and lubricated by the suction refrigerant passing through the suction passage. According to a third aspect of the present invention, in the first or second aspect of the present invention, a suction port for sucking the refrigerant into the case is provided in the motor chamber on an axis of the drive shaft. Make a summary.

According to the present invention, the suction path from the suction port to the compression mechanism can be made shorter and straighter, and furthermore, the processing for providing the suction hole becomes easier. Therefore, compared with the case where the refrigerant passes through the long curved suction path, it is possible to reduce the flow resistance until the refrigerant reaches the compression mechanism and contribute to cost reduction.

According to a fourth aspect of the present invention, in the first aspect of the present invention, the refrigerant passage in the drive shaft is formed to penetrate both ends of the drive shaft. That is the gist.

According to the present invention, it is possible to make at least a part of the suction path more linear and to introduce the refrigerant directly into the compression mechanism. According to a fifth aspect of the present invention, in the invention according to any one of the first to fourth aspects, the compression mechanism includes a fixed scroll wall formed on a fixed scroll provided on the case side; A scroll type compression mechanism in which a movable scroll wall formed on a movable scroll operatively connected to a drive shaft meshes with the movable scroll to revolve with the rotation of the drive shaft to compress refrigerant; A refrigerant passage in the scroll is formed, and at least a part of the refrigerant introduced into the refrigerant passage in the drive shaft is introduced into the compression chamber formed by the two spiral walls via the refrigerant passage in the scroll. Is the gist.

According to the present invention, it is possible to shorten at least a part of a path for introducing the refrigerant introduced into the refrigerant passage in the drive shaft into the compression chamber. Flow resistance can be reduced. Also,
By forming the refrigerant passage in the movable scroll, the weight and cooling of the movable scroll can be reduced.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) An embodiment in which the present invention is embodied in a swash plate type electric compressor will be described below with reference to FIG. In addition, the right side of FIG.
The left is the back.

As shown in FIG. 1, the electric swash plate compressor C1
Are the motor housing 11, the front housing 12,
A cylinder block 13 and a rear housing 14 are provided. The housings 11, 12, and 14 and the cylinder block 13 are joined and fixed to each other by a plurality of through bolts (not shown) to constitute a substantially cylindrical case of the compressor. A motor chamber 15 is provided in a region surrounded by the motor housing 11 and the front housing 12,
A swash plate chamber 16 is formed in an area surrounded by the front housing 12 and the cylinder block 13.

A drive shaft 17 inserted into the motor chamber 15 and the swash plate chamber 16 is provided between the motor housing 11 and the cylinder block 13 through a pair of front and rear radial bearings 18A and 18B which are one of the drive shaft bearings. It is rotatably supported. The drive shaft 17 is a front housing 12
The center hole 12B of the wall portion 12A formed at the bottom is loosely fitted. Also, the swash plate chamber 16 and the motor chamber 15 are provided on the wall 12A.
And a communication hole 12C that communicates with.

An electric motor 21 comprising a stator 19 and a rotor 20 fixed on the drive shaft 17 so as to be integrally rotatable is accommodated in the motor chamber 15. The stator 19 and the rotor 20 are connected to the inner peripheral side of the stator 19 and the rotor 20.
Is arranged so that a slight gap is interposed between the outer peripheral side of the first and the second.

In the swash plate chamber 16, a disk-shaped swash plate 22 is fixed on the drive shaft 17 so as to be integrally rotatable.
A thrust bearing 23, which is one of the drive shaft bearings, is disposed between the drive shaft 12 and the wall 12A. The integrated drive shaft 17 and swash plate 22 are provided with a washer 25 urged forward by a spring 24 disposed in a housing recess 13 </ b> A formed in the center of the cylinder block 13, and a thrust bearing 2.
3 position in the thrust direction (the direction of the drive shaft axis).

The cylinder block 13 has a plurality of (two shown in FIG. 1) cylinder bores 13B.
A single-headed piston 26 is housed in each cylinder bore 13B so as to be slidable back and forth in the front-rear direction.
A compression chamber 13C whose volume changes in accordance with the reciprocal sliding of the piston 26 is defined therein. A concave portion 26A is provided at a front portion of each piston 26, and a shoe 28 is accommodated in the concave portion 26A. Swash plate 2 on shoe 28
The piston 26 is operatively connected to the swash plate 22 by slidably holding the peripheral edge of the piston 2. For this reason,
With the rotation of the drive shaft 17 by the electric motor 21, the swash plate 22 rotates synchronously with the drive shaft 17, whereby the swash plate 2 is rotated.
2 is converted into a reciprocating linear movement of the piston 26 at a stroke corresponding to the inclination angle.

Cylinder block 13 and rear housing 1
4, the valve forming body 30 is provided so as to be sandwiched therebetween. Valve body 30 and rear housing 14
A suction chamber 31 through which the refrigerant introduced into each of the cylinder bores 13B passes and a discharge chamber 33 through which the refrigerant discharged from each of the cylinder bores 13B passes are defined. A discharge port 33 </ b> A communicating with the discharge chamber 33 is formed on the rear wall of the rear housing 14.

The valve forming body 30 is formed by stacking a suction valve forming plate, a port forming plate, a discharge valve forming plate, and a retainer forming plate with pins 34. The valve forming body 30 is formed with a suction port 35 and a suction valve 36 for opening and closing the port 35, and a discharge port 37 and a discharge valve 38 for opening and closing the port 37, corresponding to each cylinder bore 13B. The suction chamber 31 communicates with each cylinder bore 13B via the suction port 35, and each cylinder bore 13B communicates with the discharge chamber 33 via the discharge port 37.

The cylinder bore 13B, the swash plate 22, the piston 26, the shoe 28, and the valve body 30 constitute a compression mechanism for compressing the refrigerant. A collective chamber 13D is defined in the central portion on the rear side of the cylinder block 13, and between the collective chamber 13D and the swash plate chamber 16, a plurality of (two shown in FIG. 1) communicating the two chambers are formed. One set hole 13
E is formed. Further, the collecting room 13D and the accommodation recess 1
A second collecting hole 13F communicating between the two chambers is formed between the second collecting hole 13F and the second collecting hole 13F. In addition, the cylinder block 13 has a suction communication hole 1 for constantly communicating the collecting chamber 13D and the suction chamber 31.
3G is provided.

The front housing of the motor housing 11 is provided with a bearing housing 11A in which a radial bearing 18A is provided. Further, a suction port 11B for communicating the bearing housing portion 11A with the outside of the motor chamber 15 and sucking the refrigerant into the case of the compressor C1 is provided on the front side wall on the axis of the drive shaft 17. ing.

The drive shaft 17 is arranged such that the front end and the rear end thereof are housed in the bearing housing portion 11A and the housing recess 13A, respectively. The drive shaft 17 includes the drive shaft 17.
Is provided with a shaft inner hole 17A penetrating both ends of the shaft. That is, the bearing housing 11A and the housing recess 13A are formed in the shaft inner hole 1A.
7A. Further, the drive shaft 17 has a first branch hole 17B communicating the shaft inner hole 17A with the front side of the rotor 20 in the motor chamber 15, and a second branch hole communicating the thrust bearing 23 with the shaft inner hole 17A. A branch hole 17C is provided. The shaft inner hole 17A, the first branch hole 17B, and the second branch hole 17C form a drive shaft refrigerant passage.

The bearing housing 11A, the shaft inner hole 17A,
Housing recess 13A, second collecting hole 13F, collecting chamber 13D, suction communication hole 13G, suction chamber 31, first branch hole 17B, motor chamber 15, communication hole 12C, swash plate chamber 16, first collecting hole 13
E, the second branch hole 17C and the thrust bearing 23 constitute a suction path for introducing the suction refrigerant sucked through the suction port 11B into the case of the compressor C1 to the compression mechanism.

The suction port 11B and the discharge port 33A are connected by an external refrigerant circuit (not shown). Further, the refrigerant circulating in the compressor C1 and the external refrigerant circuit contains a mist of lubricating oil, and is lubricated so as to make the operation of the compressor C1 smooth.

Next, the operation of the compressor configured as described above will be described. Drive shaft 17 by electric motor 21
Is rotated, the swash plate 22 rotates integrally. Swash plate 22
The piston 26 is reciprocally driven via the shoe 28 with the rotation of. With the continuation of the driving, the suction, compression, and discharge of the refrigerant are sequentially repeated in the compression chamber 13C.

Refrigerant drawn into the suction port 11B from the external refrigerant circuit side flows through the shaft receiving hole 11B through the bearing housing 11A.
A is introduced. Part of the refrigerant introduced into the shaft inner hole 17A is introduced into the collecting chamber 13D through the housing recess 13A and the second collecting hole 13F.

The remaining part of the refrigerant is supplied to the first branch hole 17.
After being introduced to the front side of the rotor 20 in the motor chamber 15 via B, it is introduced to the rear side of both through a gap between the stator 19 and the rotor 20. At this time, the electric motor 21 is cooled by the refrigerant taking away the heat of the electric motor 21. Thereafter, the refrigerant introduced to the rear side of the stator 19 and the rotor 20 is supplied to the swash plate chamber 1 through the communication hole 12C.
6, after being introduced into the first collecting hole 13E, the collecting chamber 1
Introduced in 3D.

Of the refrigerant introduced from the bearing housing 11A into the shaft inner hole 17A, refrigerant other than the above-described refrigerant is introduced into the gap of the thrust bearing 23 through the second branch hole 17C, and then is introduced into the swash plate chamber 16A. And, it is introduced into the collecting chamber 13D through the first collecting hole 13E. The thrust bearing 23 is
The refrigerant is cooled by the refrigerant passing through the gap between the thrust bearings 23 and is lubricated by the mist-like lubricating oil contained in the refrigerant.

A part of the refrigerant introduced into the swash plate chamber 16 is introduced into the collecting chamber 13D through the housing recess 13A and the second collecting hole 13F. The refrigerant introduced into the collecting chamber 13D is introduced into the suction chamber 31 through the suction communication hole 13G, and then is sucked into the compression chamber 13C through the suction port 35,
Due to the compression action of the piston 26, the discharge port 37
Through the discharge chamber 33. The refrigerant discharged into the discharge chamber 33 is sent out from the discharge port 33A to the external refrigerant circuit.

According to this embodiment, the following effects can be obtained. (1) Since a part of the low-temperature suction refrigerant from the suction port 11B is introduced into the motor chamber 15, the electric motor 21 can be cooled well. Further, lubrication of the radial bearing 18A is enabled by the lubricating oil in the refrigerant.

(2) The refrigerant introduced into the front side of the rotor 20 through the first branch hole 17B is supplied to the stator 19 and the rotor 2
Since it is introduced to the rear side of both via the gap with zero, a wide range of the surface of the electric motor 21 can be cooled, and the electric motor 21 can be cooled well.

(3) Part of the refrigerant introduced from the suction port 11B into the collecting chamber 13D is introduced into the motor chamber 15, and the rest is not introduced into the motor chamber 15. Therefore, the temperature of the refrigerant introduced into the collecting chamber 13D can be reduced as compared with the case where all the refrigerant sucked from the intake port 11B is introduced into the motor chamber 15. That is, an increase in the specific volume due to a rise in the temperature of the refrigerant drawn into the compression chamber 13C can be suppressed, and a decrease in compression efficiency can be suppressed.

Further, since all the refrigerant sucked from the suction port 11B does not pass through a small gap between the stator 19 and the rotor 20, the viscosity of the lubricating oil in the refrigerant generated when the refrigerant passes through the gap is reduced. Based resistance can be reduced. Accordingly, the overall refrigerant suction efficiency from the suction port 11B to the compression chamber 13C is improved.

(4) The drive shaft 17 is provided with a shaft inner hole 17A and a first branch hole 17B, and the refrigerant sucked from the suction port 11B is divided into one to be introduced into the motor chamber 15 and one not to be introduced. Therefore, for example, the inlet for sucking the refrigerant from outside the case of the compressor C1 is connected to the motor housing 11.
By providing two on the front side and the rear side of the electric motor 21, one suction port 1 can be provided without adopting a configuration that prevents a part of the refrigerant from passing through the electric motor 21.
The refrigerant can be sucked into the case only by 1B. That is,
Since the number of connection points between the compressor C1 and the external refrigerant circuit can be reduced, processing such as seal processing is reduced, cost can be reduced, and reliability is improved. In addition, a bypass path is formed in the peripheral wall of the motor housing 11 and the front housing 12, and the suction port 11 is formed.
Processing becomes easier as compared with a configuration in which the refrigerant sucked from B is introduced into the swash plate chamber 16 and the suction chamber 31 without passing through the motor chamber 15 via the bypass path.

(5) The second branch hole 17C is provided, and a part of the refrigerant in the shaft inner hole 17A is introduced into the swash plate chamber 16. Thereby, the lubrication efficiency in the swash plate chamber 16 (for example, the radial bearing 18B, the swash plate 22, the thrust bearing 23, the recess 26A, the shoe 28, etc.) is improved.

(6) The refrigerant introduced into the swash plate chamber 16 from the shaft inner hole 17A passes through the gap of the thrust bearing 23 by the second branch hole 17C. This allows
The lubrication efficiency of the thrust bearing 23 is improved.

(7) Since the suction port 11B is disposed on the axis of the drive shaft 17 of the motor chamber 15, the path between the suction port 11B and the shaft inner hole 17A can be shortened and made linear. Therefore, the flow resistance before the refrigerant reaches the shaft inner hole 17A can be reduced as compared with the case where the refrigerant passes through the long curved path. In addition, since it becomes possible to match the center of the motor housing 11 and the bearing accommodating portion 11A, the processing of the suction port 11B becomes easy.

(8) A shaft inner hole 17A penetrating both ends of the drive shaft 17 is provided so that the refrigerant sucked from the suction port 11B is introduced into the collecting chamber 13D. Therefore, the suction port 11
The refrigerant path from B to the collection chamber 13D can be made shorter and linear, and the flow resistance of the refrigerant can be reduced. Further, since the refrigerant can be directly introduced from the suction port 11B into the collecting chamber 13D, it is possible to suppress an increase in the temperature of the refrigerant introduced into the compression chamber 13C, that is, an increase in the specific volume.

(Second Embodiment) A second embodiment in which the present invention is embodied in a scroll-type electric compressor will be described below with reference to FIGS. Note that the right side in FIG. 2 is the front of the compressor, and the left side is the rear.

As shown in FIG. 2, a center housing 52 is joined to the fixed scroll 51, and a motor housing 53 is joined to the center housing 52. The fixed scroll 51, the center housing 52, and the motor housing 53 form a case of the electric scroll compressor C2. A shaft 54 is rotatably supported by the center housing 52 and the motor housing 53 via radial bearings 55 and 56 as drive shaft bearings. An eccentric shaft 57 is formed integrally with the shaft 54. An inner peripheral surface of the motor housing 53,
The area surrounded by the center housing 52 is the motor chamber 58.

A bush 60 is fitted on the eccentric shaft 57. The shaft 54, the eccentric shaft 57 and the bush 6
0 forms the drive shaft. A movable scroll 61 is rotatably supported by the bush 60 via a needle bearing 62 as a mechanical bearing so as to face the fixed scroll 51. A movable scroll wall 64 extends from a movable substrate 63 of the movable scroll 61, and a fixed spiral wall 66 that meshes with the movable scroll wall 64 extends from a fixed substrate 65 of the fixed scroll 51. The needle bearing 62 is housed in a housing portion formed on a boss 67 projecting forward (to the right in FIG. 1) of the movable substrate 63. An area defined by the fixed substrate 65, the fixed spiral wall 66, the movable substrate 63, and the movable spiral wall 64 becomes a sealed chamber 68 as a compression chamber whose volume changes in accordance with the rotation of the movable scroll 61. Near the center of the fixed substrate 65, a compressor C
Discharge port 69 that communicates the outside of case 2 with closed chamber 68
Is provided.

On the movable scroll 61 side of the center housing 52, a plurality of recesses 70 (only one is shown in FIG. 2) are formed on substantially the same circumference. Each recess 70 accommodates a fixed pin 71 fixed to the center housing 52 and a movable pin 72 fixed to the movable scroll 61. An annular ring 73 is provided around the fixed pin 71 and the movable pin 72. The orbiting scroll 61 revolves with the rotation of the eccentric shaft 57, and the fixed pin 71,
The movable pin 72 and the annular ring 73 prevent rotation.

The scroll type compression mechanism is constituted by the movable scroll 61, the needle bearing 62, the fixed substrate 65, the fixed spiral wall 66, the fixed pin 71, the movable pin 72 and the annular ring 73.

On the rear side of the center housing 52, a movable substrate chamber 52A for accommodating the movable substrate 63 is formed. An intermediate chamber 52B that connects the two chambers is provided between the movable substrate chamber 52A and the motor chamber 58. As shown in FIGS. 2 and 3, near the outer periphery of the movable substrate 63, a plurality (eight in FIG. 3) penetrating the front and rear surfaces of the movable substrate 63 is provided.
A substrate communication hole 63A having a circular arc cross section is provided. The outermost one (hereinafter, referred to as a low-pressure closed chamber) of the plurality of closed chambers 68 and the intermediate chamber 52B can communicate with each other by the substrate communication hole 63A.

At substantially the center of the center housing 52,
A boss chamber 52C in which the boss portion 67 is stored is formed. On the motor room 58 side of the boss room 52C, a bearing room 52D for accommodating the radial bearing 55 is formed so as to protrude toward the motor room 58 side. Boss room 5
2C and the bearing chamber 52D are radial bearing 5
5 through the gap. The boss chamber 52C and the intermediate chamber 52B are provided with a communication hole 52E provided between the two chambers.
Can be communicated.

A stator 80 is fixed to the inner peripheral surface of the motor housing 53, and a rotor 81 is fixed to the outer peripheral surface of the shaft 54 at a position facing the stator 80. The stator 80 and the rotor 81 are arranged so that a slight gap is interposed between the inner peripheral side of the stator 80 and the outer peripheral side of the rotor 81. The stator 80 and the rotor 81 constitute an electric motor, and the rotor 81 and the shaft 54 rotate integrally by energizing the stator 80.

On the front side wall of the motor housing 53, a bearing housing 53A for housing the radial bearing 56 and the front end of the shaft 54 is provided. Further, a suction port 53B for communicating the bearing storage portion 53A with the outside of the motor chamber 58 and sucking the refrigerant into the case of the compressor C1 is provided on the front side wall of the front wall. I have.

The shaft 54 is provided with a shaft hole 54A passing through both ends of the shaft 54. Also,
The shaft 54 has a first branch hole 54 communicating the shaft hole 54A with the front side of the rotor 81 in the motor chamber 58.
B and the radial bearing 55 in the bearing chamber 52D.
A second branch hole 54C communicating between the front side and the shaft hole 54A is provided. The eccentric shaft 57 is provided with a shaft hole 57A penetrating both ends of the eccentric shaft 57,
The shaft hole 57A communicates with the shaft hole 54A. The shaft hole 54A, the first branch hole 54B, the second branch hole 54C, and the shaft hole 57A constitute a refrigerant passage in the drive shaft.

As shown in FIGS. 2 and 3, the movable substrate 63
A relay room 63B is formed at the front side of the center of the relay room.
In the movable board 63, a relay chamber 63B and a board communication hole 63A are provided.
(In the present embodiment, four) are formed. The relay chamber 63B, the relay passage 63C, and the substrate communication hole 63A form an in-scroll refrigerant passage, and the in-scroll refrigerant passage communicates with the housing portion of the boss 67 and the intermediate chamber 52B.

The bearing housing 53A, the shaft hole 54
A, shaft hole 57A, first branch hole 54B, motor chamber 58, intermediate chamber 52B, second branch hole 54C, bearing chamber 52D,
Radial bearing 55, boss chamber 52C, communication hole 52
E, board communication hole 63A, relay chamber 63B and relay passage 63
C forms a suction path for introducing the suction refrigerant sucked through the suction port 53B into the case of the compressor C2 into the scroll-type compression mechanism.

The suction port 53B and the discharge port 69 are connected by an external refrigerant circuit (not shown). Next, the operation of the compressor configured as described above will be described.

When the shaft 54 is rotated by the electric motor, the eccentric shaft 57 and the bush 60 rotate integrally. The eccentric shaft 57 and the bush 60 rotate eccentrically with respect to the rotation center of the shaft 54. This rotation is transmitted to the movable scroll 61 via the needle bearing 62,
The movable scroll 61 revolves. With this revolution, the volume of the closed chamber 68 changes, and the suction, compression, and discharge of the refrigerant are sequentially repeated.

The refrigerant sucked into the suction port 53B from the external refrigerant circuit side is introduced into the shaft hole 54A through the bearing housing 53A. A part of the refrigerant introduced into the shaft hole 54A passes through the shaft communication hole 63A via the shaft hole 57A, the internal space of the boss 67, the relay chamber 63B and the relay passage 63C.
And is sucked into the closed chamber 68 (the low-pressure closed chamber).

The remaining part of the refrigerant is supplied to the first branch hole 54.
After being introduced to the front side of the rotor 81 in the motor chamber 58 through B, it is introduced to the rear side of both through a gap between the stator 80 and the rotor 81. At that time, the electric motor is cooled. Thereafter, the refrigerant introduced to the rear side of the stator 80 and the rotor 81 is introduced to the substrate communication hole 63A via the intermediate chamber 52B.

Of the refrigerant introduced from the bearing housing 53A into the shaft hole 54A, those other than those described above are introduced into the bearing chamber 52D through the second branch hole 54C.
It is introduced into the boss chamber 52C through the gap of the radial bearing 55. Thereby, the radial bearing 55 is lubricated. Part of the refrigerant introduced into the boss chamber 52C is supplied to the substrate communication hole 63A via the communication hole 52E and the intermediate chamber 52B.
, And the remaining refrigerant is introduced into the relay chamber 63B through the gap between the needle bearings 62 in the boss portion 67. The needle bearing 62 is lubricated by mist-like lubricating oil contained in the refrigerant passing through the gap between the needle bearing 62.

The refrigerant sucked into the closed chamber 68 (low-pressure closed chamber) is compressed by the revolution of the orbiting scroll 61 and sent out to the external refrigerant circuit through the discharge port 69. In the present embodiment, the following effects can be obtained in addition to the effects similar to the above (1) to (4), (7) and (8).

(9) The second branch hole 54C is provided, a part of the refrigerant in the shaft hole 54A is introduced into the bearing chamber 52D, and the boss chamber 52 is further inserted through the radial bearing 55.
C. Thereby, the radial bearing 55 and the inside of the boss chamber 52C (for example, the bush 60,
Needle bearing 62) can be satisfactorily lubricated.

(10) A part of the refrigerant introduced into the boss chamber 52C is introduced into the relay chamber 63B through the gap of the needle bearing 62. Thereby, the lubrication efficiency of the needle bearing 62 is improved.

(11) The movable substrate 63 from the shaft hole 57A side
The refrigerant introduced into the relay chamber 63B at the center of the
The substrate communication hole 63A on the outer peripheral side of the movable substrate 63 via the 3C
Was introduced. For this reason, it is possible to shorten the refrigerant path from the shaft hole 57A to the closed chamber 68 (low-pressure closed chamber), and it is possible to reduce the flow resistance until the refrigerant reaches the closed chamber 68 (low-pressure closed chamber).

(12) Relay room 63B and relay passage 63
By disposing C, the movable scroll 61 is reduced in weight. (13) The relay passage 63C was not connected to all of the eight substrate communication holes 63A, and only four relay passages 63C were provided. This reduces the processing load on the relay passage 63C,
Cost increase can be suppressed.

The embodiment is not limited to the above, and may be, for example, in the following mode. The second branch hole 17C (the second branch hole 54C in the second embodiment) may not be provided. That is, the refrigerant in the shaft inner hole 17A (shaft hole 54A) is transferred to the thrust bearing 23.
(Radial bearing 55) need not be introduced.

The suction port 11B (the suction port 53B in the second embodiment) does not have to be disposed on the axis of the drive shaft 17 (shaft 54). For example, the suction port 11B (the suction port 5
3B) to the motor chamber 15 (motor chamber 58) without passing through the bearing housing 11A (bearing housing 53A). In this case, the motor chamber 1 is connected from the suction port 11B (the suction port 53B).
Part of the refrigerant introduced into 5 (motor chamber 58) is introduced into compression chamber 13C (closed chamber 68) through a gap between stator 19 (stator 80) and rotor 20 (rotor 81). The remaining part is the first branch hole 17B (the first branch hole 54B).
After being introduced into the shaft inner hole 17A (shaft hole 54A) via B), it is introduced into the compression chamber 13C (sealed chamber 68).

The shaft inner hole 17A may not be formed behind the second branch hole 17C. In this case, the refrigerant in the shaft inner hole 17A flows into the second branch hole 17C and the swash plate chamber 16.
And, it is introduced into the collecting chamber 13D through the first collecting hole 13E.

If the suction port 11B (suction port 53B) is in communication with the motor chamber 15 (motor chamber 58), the front side of the first branch hole 17B (first branch hole 54B)
The shaft inner hole 17A (shaft hole 54A) may not be formed. In this case, a part of the refrigerant in the motor chamber 15 (motor chamber 58) is supplied to the first branch hole 17B (first branch hole 54).
B) is introduced into the shaft inner hole 17A (shaft hole 54A).

The compression mechanism of the electric swash plate compressor C1 (the electric scroll compressor C2 in the second embodiment) is of a fixed displacement type in which the discharge refrigerant capacity per rotation of the drive shaft 17 (shaft 54) is constant. It is not necessary. For example, the compression mechanism of the electric swash plate compressor C1 may be capable of changing the stroke of the piston 26. Further, in the compression mechanism of the electric scroll compressor C 2, a portion of the refrigerant sucked into the closed chamber 68 is introduced into the closed chamber 68 before the refrigerant is introduced into the discharge port 69.
8 may be of a type in which the capacity of the refrigerant discharged from the discharge port 69 is changed.

In the electric swash plate compressor C1, the swash plate 22 rotates integrally with the drive shaft 17, but the swash plate for reciprocating the piston does not rotate integrally with the drive shaft, but rotates integrally with the drive shaft. The piston may be operatively connected to a rotating plate to reciprocate the piston without rotation.

The electric swash plate compressor C1 is provided with a support surface intersecting at a predetermined angle with respect to the axis of the drive shaft, and a support shaft formed perpendicular to the support surface on the drive shaft. May be provided such that a swash plate for reciprocating is supported rotatably relative to the support shaft via a thrust bearing between the support surface and the support shaft.

The swash plate compressor C1 sucks the refrigerant once discharged from the compression chamber into another compression chamber different from the compression chamber as disclosed in, for example, Japanese Patent Application Laid-Open No. 10-184439. A multi-stage electric swash plate compressor that compresses and discharges again may be used.

The electric swash plate compressor C1 may be of any cylinder type. For example, it may be a two-cylinder, three-cylinder, four-cylinder or five-cylinder, or a six-cylinder or seven-cylinder.

The shaft hole 54A may not be formed behind the second branch hole 54C. In this case, the refrigerant in the shaft hole 54A is the second branch hole 54C,
It is introduced into the substrate communication hole 63A via the bearing chamber 52D, the boss chamber 52C, the communication hole 52E, and the intermediate chamber 52B.
According to this, it is not necessary to form the shaft hole 57A.

In the electric scroll compressor C2,
A seal member may be interposed between the bush 60 and the front side of the movable substrate 63 so that the refrigerant from the shaft hole 57A is not introduced to the outer peripheral side of the bush 60.

The relay room 63B and the relay passage 63C
It may not be provided. The number of the substrate communication holes 63A is not limited to eight, and may be any number as long as the introduction of the refrigerant into the closed chamber 68 is not hindered.

The relay passage 63C is provided with the entire board communication hole 63.
A may be communicated with. In addition, one substrate communication hole 6
Any number of relay passages 63C may communicate with 3A.
Also, any number of relay passages 63C may be provided.

Next, technical ideas other than the inventions described in the claims that can be understood from the above-described embodiment will be described below together with their effects. (1) In the invention according to any one of claims 1 to 4, a piston, which accommodates the compression mechanism in a reciprocating manner in a cylinder bore provided in the case, is operatively connected to the drive shaft, A reciprocating piston-type compression mechanism for compressing refrigerant by reciprocating motion of the piston accompanying rotation of the drive shaft. In this case, in the electric compressor having the reciprocating piston type compression mechanism, the motor cooling, the reduction of the specific volume of the refrigerant, and the suppression of the decrease in the refrigerant suction efficiency of the compression mechanism due to the viscous resistance of the lubricating oil are realized at low cost and with high reliability. can do.

[0078]

As described above in detail, according to the first to fifth aspects of the present invention, in the electric compressor, the motor cooling,
The specific volume of the refrigerant can be reduced and the reduction of the refrigerant suction efficiency of the compression mechanism due to the viscous resistance of the lubricating oil can be suppressed at low cost and with high reliability.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an outline of an electric compressor according to a first embodiment.

FIG. 2 is a sectional view showing an outline of an electric compressor according to a second embodiment.

FIG. 3 is a rear view of the movable scroll.

[Explanation of symbols]

11, 53: motor housing, 11A: bearing housing,
11B, 53B: suction port, 12: front housing,
12C: communication hole, 13: cylinder block, 13A: accommodation recess, 13B: cylinder bore, 13D: collective chamber, 13
E: first collecting hole, 13F: second collecting hole, 13G: suction communication hole, 14: rear housing (11, 12, 13, and 1)
4 constitutes a case), 15, 58 ... motor room, 16
... Swash plate chamber, 17 ... Drive shaft, 17A ... Shaft inner hole, 17B ... First branch hole, 17C ... Second branch hole (17A, 17B and 1)
7C constitutes a refrigerant passage in the drive shaft), 18A, 18B
... Radial bearings as drive shaft bearings, 19,80
... stator, 20, 81 ... rotor, 21 ... electric motor,
22 swash plate, 23 thrust bearing as drive shaft bearing, 26 piston, 28 shoe, 30 valve forming body (13B, 22, 26, 28 and 30 constitute a compression mechanism), 31 suction chamber (11A, 12C, 13A, 13
D, 13E, 13F, 13G, 15, 16, 17A, 1
7B, 17C, 23 and 31 constitute the suction path),
51: fixed scroll, 52: center housing (5
1, 52 and 53 constitute a case), 52B ... intermediate chamber, 52C ... boss chamber, 52D ... bearing chamber, 52E ...
Communication hole, 53A: Bearing storage part, 54A: Shaft hole, 5
4B: first branch hole, 54C: second branch hole, 55, 56 ...
Radial bearings as drive shaft bearings, 57A... Shaft holes (54A, 54B, 54C and 57A constitute a refrigerant passage in the drive shaft), 54... Shaft, 57.
... bush (54, 57 and 60 constitute a drive shaft), 61 ... movable scroll, 62 ... needle bearing as mechanism bearing, 63A ... board communication hole, 63B ... relay chamber, 63C ... relay passage (63A, 63B and 63C constitutes a refrigerant passage in the scroll.
C, 52D, 52E, 53A, 54A, 54B, 54
C, 55, 57A, 58, 63A, 63B and 63C constitute a suction path), 64: movable spiral wall, 65: fixed substrate, 66: fixed spiral wall, 68: closed chamber as a compression chamber, 71: fixed Pin, 72: movable pin, 73: annular ring (61, 62, 65, 66, 71, 72, and 73 constitute a scroll-type compression mechanism).

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Naoya Yokomachi 2-1-1 Toyota-cho, Kariya-shi, Aichi Pref. Inside Toyota Industries Corporation (72) Inventor Toshiro Fujii 2-1-1 Toyota-cho, Kariya-shi, Aichi Pref. F term in Toyota Industries Corporation (reference) 3H003 AA01 AA03 AB04 AC03 BE07 3H029 AA02 AA16 AB03 BB42 CC07 CC09 CC16 CC17 CC23 CC27 3H039 AA02 AA12 BB28 CC02 CC12 CC26 CC33

Claims (5)

[Claims] 1. A compression mechanism for compressing refrigerant in a case, an electric motor having a stator and a rotor disposed in a motor chamber of the case, and an electric motor connected to the rotor and connected to the compression mechanism by the electric motor. A drive shaft for transmitting rotational drive force of the motor, a suction path for introducing the suction refrigerant sucked into the case into the compression mechanism, the motor chamber, and a drive shaft refrigerant passage formed in the drive shaft. A part of the suction refrigerant passes through a gap between the stator and the rotor and is introduced into the compression mechanism, and another part of the suction refrigerant passes through a gap between the stator and the rotor. An electric compressor which is introduced into the compression mechanism through the refrigerant passage in the drive shaft without being introduced. 2. The suction path is provided with at least one of a drive shaft bearing for rotatably supporting the drive shaft on the case and a mechanism bearing for supporting part or all of the compression mechanism. Item 2. The electric compressor according to Item 1. 3. The electric compressor according to claim 1, wherein a suction port for sucking a refrigerant into the case is disposed in the motor chamber on an axis of the drive shaft. 4. The electric compressor according to claim 1, wherein the refrigerant passage in the drive shaft is formed to penetrate both ends of the drive shaft. 5. The compression mechanism, wherein a fixed scroll wall formed on a fixed scroll provided on the case side and a movable scroll wall formed on a movable scroll operatively connected to the drive shaft, A scroll-type compression mechanism in which a refrigerant is compressed by orbiting of the orbiting scroll along with rotation of a drive shaft, wherein the orbiting scroll has a refrigerant passage in the scroll formed therein, and a refrigerant introduced into the refrigerant passage in the drive shaft. The electric compressor according to any one of claims 1 to 4, wherein at least a part of the electric compressor is introduced into a compression chamber formed by the two spiral walls via the in-scroll refrigerant passage.