Patent Application
20140322048
The present invention relates to a motor-driven compressor.
Japanese Patent Laid-Open No. 2010-59809 discloses a conventional motor-driven compressor (hereinafter, simply called a compressor). The compressor includes an electric driving mechanism, a compression mechanism that is driven by the electric driving mechanism and performs compression of a refrigerant, and a motor drive circuit for driving the electric driving mechanism.
The electric driving mechanism is accommodated in a housing. The electric driving mechanism has a stator, a rotor, a drive shaft, a lead wire and a cluster block. The stator has a stator core and a coil provided at the stator core. The rotor is rotatably provided in the stator. The drive shaft is fixed to the rotor. The drive shaft drives the compression mechanism. The lead wire is connected to the coil. The cluster block electrically connects the lead wire to the motor drive circuit.
The housing has a main body portion in a cylindrical shape, and a bulging portion that bulges in a radially outward direction from the main body portion. At the front of the main body portion, the compression mechanism is accommodated. Further, at the rear of the main body portion, a stator accommodation chamber in which the stator is accommodated is formed in an inside thereof. The stator core is supported in the stator accommodation chamber in the main body portion. For support of the stator core to the main body portion, shrinkage fitting or press fitting is generally adopted. The bulging portion is integrated with the main body portion. The bulging portion forms a cluster block accommodation chamber in an inside thereof. The cluster block is accommodated in the cluster block accommodation chamber.
In the compressor, the motor drive circuit is provided at a rear side of the housing, and electric power is supplied to the coil from the motor drive circuit, whereby the electric driving mechanism rotates the drive shaft, and the compression mechanism is operated. Therefore, if the compressor is mounted on a hybrid vehicle, the vehicle interior can be air-conditioned even when the engine is stopped.
However, in the conventional compressor as described above, the housing in which the bulging portion is located in the radially outward direction of the main body portion is adopted. Therefore, in the compressor, stress that acts on the outer circumferential surface of the stator core becomes ununiform when the stator core is shrinkage-fitted into the stator accommodation chamber of the housing, and circularity of the stator core after being fixed tends to be low. The same also applies to the case of the stator core being press-fitted into the housing. Therefore, in this compressor, the electric driving mechanism hardly keeps high efficiency.
The present invention has been made in the light of the conventional circumstances described above, and a problem to be solved is to provide a motor-driven compressor in which an electric driving mechanism is capable of keeping high efficiency.
A motor-driven compressor of the present invention comprises an electric driving mechanism, a compression mechanism that is driven by the electric driving mechanism, and performs compression of a refrigerant, and a motor drive circuit for driving the electric driving mechanism.
The electric driving mechanism has a stator, a rotor, a drive shaft, a lead wire and a cluster block. The stator is accommodated in a housing, and has a stator core and a coil provided at the stator core. The rotor is rotatably provided in the stator. The drive shaft is fixed to the rotor, and drives the compression mechanism. The lead wire is connected to the coil. The cluster block electrically connects the lead wire to the motor drive circuit.
The housing has a main body portion, a bulging portion and a partition wall. The main body portion is in a cylindrical shape, and forms a stator accommodation chamber in which the stator is accommodated, in an inside thereof. The bulging portion bulges in a radially outward direction from the main body portion, and forms a cluster block accommodation chamber in which the cluster block is accommodated, in an inside thereof. The partition wall separates the stator accommodation chamber and the cluster block accommodation chamber, in a radial direction. The housing supports the stator core at the main body portion and the partition wall. Further, in the housing, the lead wire is disposed across the stator accommodation chamber and the cluster block accommodation chamber.
Hereinafter, embodiments 1 and 2 in which the present invention is embodied will be described with reference to the drawings.
A compressor of embodiment 1 is used in an air-conditioning apparatus that is mounted on a hybrid vehicle and performs temperature control of a vehicle interior. As shown in
The housing 1 is formed of a main housing 10, an end housing 12 and a cover 14. The main housing 10 is in a bottomed cylindrical shape. The end housing 12 is located at a front of the main housing 10 to close an opening of the main housing 10. The cover 14 is fixed to a rear end of the main housing 10.
In the main housing 10, a fixed block 9 is supported. A front portion of the housing 1 is configured by a front portion of the main housing 10 that is located forward of the fixed block 9, and the end housing 12. In the front portion, a compression mechanism accommodation chamber 11a is formed. In the compression mechanism accommodation chamber 11a, the compression mechanism 5 is housed.
Further, a main body portion 1b in a cylindrical shape and a bulging portion 1c are configured by a rear portion of the housing 1, which is located rearward of the fixed block 9. In the main body portion 1b, a stator accommodation chamber 11b that continues in an axial direction to the compression mechanism accommodation chamber 11a is formed. A stator 15 of the electric driving mechanism 3 is accommodated in the stator accommodation chamber 11b. The bulging portion 1c forms a cluster block accommodation chamber 11c that is located in a radially outward direction of the stator accommodation chamber 11b. A lead wire 21 and a cluster block 23 are accommodated in the cluster block accommodation chamber 11c.
The cover 14 is fixed to the rear end of the main housing 10 in such a manner as to form a motor drive circuit chamber 7b between the cover 14 and the main housing 10. In the motor drive circuit chamber 7b, the motor drive circuit 7 is accommodated. Therefore, in the present embodiment, the compression mechanism 5, the electric driving mechanism 3, and the motor drive circuit 7 are disposed in this sequence side by side along an axial direction of a drive shaft 19 that will be described later.
The electric driving mechanism 3 has the stator 15, a rotor 17, the drive shaft 19, the lead wire 21 and the cluster block 23. The stator 15, the rotor 17 and the drive shaft 19 are accommodated in the stator accommodation chamber 11b. As shown in
A central portion of the fixed block 9 protrudes rearward, and a shaft hole 9a is formed in a center thereof. At a front side of the shaft hole 9a, a shaft seal device 27 and a bearing device 29a are fixed to the fixed block 9. A front side of the drive shaft 19 is inserted through the shaft hole 9a. In an inside of the rear end of the main housing 10, a boss portion 31a in a cylindrical shape is provided to protrude toward the front side. The boss portion 31a is provided with a bearing device 29b. The drive shaft 19 drives the compression mechanism 5 that will be described later.
A connector 33 is provided at a front end side of the lead wire 21. The lead wire 21 is connected to the coil 25 by the connector 33. A rear end side of the lead wire 21 is connected to the cluster block 23 via a connection terminal 23a that is accommodated in an inside of the cluster block 23. The cluster block 23 is connected to the motor drive circuit 7 via a connection terminal 23b.
The compression mechanism 5 has a fixed scroll 35 that is fixed to an inner circumferential surface of the main housing 10, and a movable scroll 37 that is disposed to face the fixed scroll 35. The fixed scroll 35 is fixed to the fixed block 9 by a plurality of pins 39. The movable scroll 37 is disposed between the fixed block 9 and the fixed scroll 35. The fixed scroll 35 and the movable scroll 37 are meshed with each other, and a compression chamber 41 is formed between both of them.
In a central portion of a rear surface of the movable scroll 37, a boss portion 31b in a cylindrical shape is provided to protrude toward a rear side. Further, a plurality of rotation preventing holes 43 are provided to be recessed in an outer circumferential region of the rear surface of the movable scroll 37. Rotation prevention rings 45 are fixed to the respective rotation preventing holes 43. On a front surface of the fixed block 9, a plurality of rotation prevention pins 40 are provided to protrude toward the front side. The respective rotation prevention pins 40 roll in the rotation prevention rings 45 respectively.
An eccentric shaft portion 19a is formed to protrude at a front end portion of the drive shaft 19. The eccentric shaft portion 19a is rotatably inserted into a bush 47 with a balancer that is provided between the fixed block 9 and the movable scroll 37. A bearing device 29c is provided between the bush 47 with a balancer and the boss portion 31b.
A discharge chamber 49 is formed between the fixed scroll 35 and the end housing 12. In the fixed scroll 35, a discharge port 49a that allows the compression chamber 41 to communicate with the discharge chamber 49 is formed. Further, at a front end surface of the fixed scroll 35, a discharge reed valve not illustrated that opens and closes the discharge port 49a, and a retainer 51 that regulates a lift amount of the discharge reed valve are fixed. In the end housing 12, a discharge port 49b is provided to penetrate through the end housing 12.
As shown in
Further, as shown in
A suction port 49c is formed at a rear end of the main housing 10. Thus, the stator accommodation chamber 11b is connected to an evaporator not illustrated by piping that is connected to the suction port 49c. The evaporator is connected to an expansion valve not illustrated by piping, and the expansion valve is connected to a condenser not illustrated by piping. Meanwhile, the discharge chamber 49 is connected to the condenser by the piping that is connected to the discharge port 49b. The compressor, the evaporator, the expansion valve and the condenser configure a refrigeration circuit of an air-conditioning apparatus for a vehicle.
In this compressor, the driver of the vehicle performs an operation to the air-conditioning apparatus, whereby power is supplied to the motor drive circuit 7 from an external battery or the like, and power is supplied to the coil 25 from the motor drive circuit 7 via the connection terminal 23b, the cluster block 23, the lead wire 21 and the connector 33. Thereby, the electric driving mechanism 3 is operated. Thereby, the rotor 17 rotates with the center axis O as the center, and the drive shaft 19 rotates. Therefore, the compression mechanism 5 is operated. Namely, the movable scroll 37 revolves around the drive shaft 19, and the compression chamber 41 gradually reduces in volume. Therefore, the refrigerant from the evaporator is sucked into the compression chamber 41 from the stator accommodation chamber 11b. At this time, the refrigerant in the stator accommodation chamber 11b cools the electric driving mechanism 3. The refrigerant that is compressed in the compression chamber 41 is discharged into the discharge chamber 49, and is discharged to the condenser. In this manner, according to the air-conditioning apparatus having the compressor, even when the engine is stopped, the vehicle interior can be air-conditioned.
The compressor is assembled as follows. First, the main housing 10 is heated, and the entire main housing 10 is expanded in the radially outward direction. Thereby, an inside diameter of the main body portion 1b in the main housing 10 becomes slightly larger than an outside diameter of the stator 15. Therefore, in this state, the stator 15 is inserted into the stator accommodation chamber 11b of the main body portion 1b. Subsequently, the main housing 10 is returned to a room temperature, and the main body portion 1b is shrunk. In this manner, the stator 15 is shrinkage-fitted into the main body portion 1b.
As shown in
Accordingly, in this compressor, the electric driving mechanism 3 can keep high efficiency.
In this compressor, the lead wire 21 is connected to the coil 25 by the connector 33. The connector 33 easily connects the lead wire 21 to the coil 25, and therefore, assembly of the compressor is facilitated.
Further, in this compressor, the lead wire 21 that is inserted through the insertion path 55 can be connected to the coil 25 at the compression mechanism 5 side. Therefore, a length in the axial direction of this compressor can be made shorter, and mountability to the vehicle or the like can be enhanced more, than in the case of connecting the lead wire 21 to the coil 25 at the motor drive circuit 7 side from the cluster block 23.
As shown in
Further, the cluster block 23 is fixed to the stator core 15b via a fitting member 59 of a resin. The fitting member 59 is located in the slit 57.
Further, in this compressor, a plurality of refrigerant channels 61 are formed in the inner circumferential surface of the main body portion 1b. The slit 57 and the respective refrigerant channels 61 are spaced equiangularly from one another in a circumferential direction of the main body portion 1b. Further, the slit 57 and the respective refrigerant channels 61 are formed to have widths equal to one another in the circumferential direction of the main body portion 1b. The other configuration is similar to that of embodiment 1.
In this compressor, by inserting the fitting member 59 through the slit 57, the cluster block 23 can be assembled in a state fixed to the stator core 15b. Therefore, in this compressor, the stator 15 and the cluster block 23 can be accommodated in the housing 10 at the same time, and assembly is easy.
Further, as shown in
While the present invention is described in conformity with embodiments 1 and 2 in the above, the present invention is not limited to embodiments 1 and 2 described above, and it goes without saying that the present invention can be applied by being properly changed within the range without departing from the gist of the present invention.
For example, in each of the compressors of embodiment 1 and 2, the cover 14 is provided at the rear of the main body portion 1b, and the compression mechanism 5, the electric driving mechanism 3 and the motor drive circuit 7 are disposed in this sequence side by side along the axial direction of the drive shaft 19. Instead of this, the cover 14 may be provided at an upper part of the main body portion 1b.
The present invention is usable in an air-conditioning apparatus of a vehicle, or the like.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2013-092547 | Apr 2013 | JP | national |
