JP2010180777A - Electric compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric compressor 5 preventing size increase, having a simpler manufacturing process and detecting the temperature of a coil 7. <P>SOLUTION: The electric compressor 5 includes a substantially cylindrical housing 1 consisting of a front housing 1a, a middle housing 1b and a rear housing 1c, a motor part 2 housed in the rear housing 1c, a compression part 3 housed in the middle housing 1b and an inverter part 4 housed in the front housing 1a. A sensor 6 for detecting the temperature of the housing 1 is arranged outside a part where a discharge gas of the middle housing 1b is in contact. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an electric compressor.

  As shown in FIG. 7, in the conventional electric compressor 100, a substantially cylindrical housing 101 including a front housing 101a, a middle housing 101b, and a rear housing 101c, a motor portion 102 accommodated in the rear housing 101c, and a middle housing. The compression part 103 accommodated in 101b and the inverter part 104 accommodated in the front housing 101a are formed.

  The motor unit 102 has a coil 105 disposed around the rotor, and rotates by a magnetic force generated by energizing the coil 105. In such a motor unit 102, since the coil 105 generates heat by energizing the coil 105, the energization is stopped when the temperature of the coil 105 abnormally increases.

  For this reason, in the conventional electric compressor 100, the sensor 106 that detects the temperature of the coil 105 in order to prevent the coil 105 from being damaged due to an excessive temperature rise of the coil 105 of the motor unit 102 and protect the coil 105 is 105 or on the surface of the coil 105.

  Further, the following patent document also describes an electric compressor that detects the temperature of a coil.

JP-A-7-180687 JP 2003-83258 A

  However, in the conventional electric compressor 100, when a harness for taking out a signal from the sensor 106 that detects the temperature of the coil 105 is taken out of the housing 101, the electric compressor 100 is hermetically sealed to ensure hermeticity inside the electric compressor 100. Since the structure is provided, there is a problem that the main body of the electric compressor 100 is enlarged.

  In addition, since a sealing structure is required to improve the sealing performance when the harness from the sensor 106 is taken out, there is a problem that the manufacturing process of the electric compressor 100 becomes complicated.

Therefore, in order to solve the above-described problems, the present invention prevents the increase in size of the electric compressor, simplifies the manufacturing process, and can accurately detect the temperature of the coil. The purpose is to provide a machine.

  The electric compressor 5 according to the first aspect includes a substantially cylindrical housing 1 including a front housing 1a, a middle housing 1b, and a rear housing 1c, a motor portion 2 accommodated in the rear housing 1c, and an accommodation in the middle housing 1b. The electric compressor 5 is provided with a compressor part 3 and an inverter part 4 housed in the front housing 1a, and the refrigerant gas is compressed by the compressor 3 in the housing 1 and the motor part 2 is cooled by the refrigerant gas. The sensor 6 for detecting the temperature of the middle housing 1b is provided on the outer periphery of the middle housing 1b touched by the discharge gas that cools the motor unit 2, and the coil 7 is detected from the detection result of the sensor 6 in the inverter unit 4. An estimation means for estimating the temperature is provided.

  The electric compressor 5 according to claim 2 is the electric compressor 5 according to claim 1, wherein a sensor 16 for detecting the temperature of the rear housing 1c is provided on the outer periphery of the rear housing 1c. The temperature of the middle housing 1b detected by 6 and the temperature difference of the rear housing 1c detected by the sensor 16 are calculated, and the temperature of the coil 7 of the motor unit 2 is estimated.

  In the present invention, a sensor for detecting the temperature of the housing is provided outside the portion of the middle housing that is in contact with the discharge gas, so that the temperature of the discharge gas in contact with the housing is detected, and the coil temperature is detected from the discharge temperature. Since the temperature is estimated, the temperature of the coil can be detected without impairing the sealing performance of the housing.

The temperature of the discharge gas and the temperature of the coil of the motor are correlated, and the temperature of the coil can be estimated by detecting the temperature of the discharge gas.

The whole sectional view of an electric compressor. The block diagram of this embodiment. The principal part enlarged view of an electric compressor. The whole sectional view of the electric compressor of other embodiments. The block diagram of other embodiment. The test result showing the correlation between discharged refrigerant gas and coil temperature. The whole sectional view of the conventional electric compressor.

 Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS.

 As shown in FIG. 1, the electric compressor 5 of this embodiment includes a substantially cylindrical housing 1 composed of a front housing 1a, a middle housing 1b, and a rear housing 1c, and a motor portion 2 accommodated in the rear housing 1c. The compressor 3 is accommodated in the middle housing 1b, and the inverter 4 is accommodated in the front housing 1a. In the electric compressor 5 of the present embodiment, a sensor 6 for detecting the temperature of the housing 1 is provided outside the portion of the middle housing 1b where the discharge gas is in contact, and the inverter 4 is detected from the detection result of the sensor 6. An estimation means (estimation calculation unit 17) for estimating the temperature of the coil 7 is provided.

 The housing 1 includes a front housing 1a in which the inverter part 4 is accommodated, a middle housing 1b in which the compression part 3 is accommodated, and a rear housing 1c in which the motor part 2 is accommodated. The middle housing 1b and the middle housing 1b and the rear housing 1c are fixed with bolts or the like.

 The motor part 2 accommodated in the rear housing 1c is fixed to the center of the motor rotor 8, a plurality of coils 7 arranged along the inner peripheral surface of the rear housing 1c, a motor rotor 8 rotated by magnetism generated from the coils 7. And a rotating rotor shaft 9. Both ends of the rotor shaft 9 are supported by a rear housing 1c and a partition wall disposed between the motor unit 2 and the side block 14 by bearings 10 so as to be rotatable. Are concatenated.

 The compression unit 3 adjacent to the motor unit 2 includes a substantially donut-shaped cylinder block 12 having a substantially elliptic rotor housing part on the inner periphery, and a rotor 13 housed on the inner periphery of the cylinder block 12 and fixed to the drive shaft 11. And a pair of side blocks 14 fixed to both ends of the cylinder block 12. In the compression unit 3, the refrigerant is compressed by the rotor 13 that is rotated by the rotational driving force of the motor unit 2, and the rotation of the motor unit 2 is controlled by the inverter unit 4.

 The inverter unit 4 includes a drive circuit unit 15 that controls driving of the motor unit 2 and an estimation calculation unit 17 that estimates the temperature of the coil 7 from the detected temperature of the discharge gas. A detection result from the sensor 6 is transmitted to the estimation calculation unit 17.

 As shown in FIG. 3, the sensor 6 includes a substantially cylindrical sensor main body 6a, a male screw portion 6c screwed with a female screw portion 6b described later, and a harness 6d that transmits information detected from the sensor main body 6a. It has become. The sensor main body 6a includes a contact surface 21 whose tip on one end side contacts the sensor mounting portion 20, and a harness lead-out portion 22 drawn from the tip on the other end side.

 The sensor attachment portion 20 to which the sensor body 6a is attached is in contact with the screw hole 23 into which the sensor body 6a is inserted, the female screw portion 6b into which the male screw portion 6c of the sensor body 6a is screwed, and the contact surface 21 of the sensor body 6a. Measuring surface 24. The sensor body 6a is connected and fixed to the sensor mounting portion 20.

 In the electric compressor 5, current flows from the drive circuit unit 15 of the inverter unit 4 to the coil 7 of the motor unit 2, the rotor 8 rotates, the rotor shaft 9 fixed to the rotor 8 rotates, and the rotor shaft 9 A rotational driving force is transmitted to the drive shaft 11 connected to one end side, and the rotor 13 of the compression unit 3 rotates to compress the refrigerant. The compressed refrigerant enters the rear housing 1c through the middle housing 1b, and is discharged outward from the discharge port through the motor portion 2 of the rear housing 1c.

  The heat of the refrigerant is transmitted to the cylinder block 12 and the middle housing 1b in contact with the compressed refrigerant, and the sensor 6 provided in the middle housing 1b detects the temperature of the middle housing 1b, thereby detecting the temperature of the refrigerant. The detection result is transmitted to the estimation calculation unit 17.

  According to the present embodiment, the temperature of the coil 7 can be estimated from the refrigerant discharge temperature by providing the sensor 6 that detects the temperature of the housing 1 outside the portion of the middle housing 1b that is in contact with the discharge gas. it can.

  As shown in FIG. 6, the test values of the discharge gas temperature and the motor coil temperature indicated by the solid line change substantially linearly between the discharge gas temperature of about 80 ° C. and about 130 ° C. Therefore, the motor coil temperature has a correlation with the discharge gas temperature.

Thereby, since the temperature of the coil 7 is not directly detected, there is no need to attach the sensor 6 in the housing 1, the size of the electric compressor 5 can be prevented, and the housing 6 d is pulled out from the sensor 6. Since no through hole is provided in 1, the sealing property can be secured, and the temperature of the coil 7 can be estimated without impairing the sealing property. Further, since the seal structure is not necessary, the manufacturing process of the electric compressor 5 can be simplified.

 The electric compressor 5 according to the second embodiment will be described with reference to FIGS. In addition, about the same component as the said 1st Example, the same code | symbol is attached | subjected and the overlapping description is abbreviate | omitted.

 As shown in FIG. 4, in the present invention, a sensor 16 for detecting the temperature of the rear housing 1c is provided in addition to the sensor 6 in the vicinity of the discharge port on the outer periphery of the rear housing 1c, and the middle housing 1b detected by the sensor 6 is provided. The difference between the temperature and the temperature of the rear housing 1 c detected by the sensor 16 is calculated, and the estimation calculation unit 17 estimates the temperature of the coil 7 of the motor unit 2.

 In this embodiment, the estimation calculation unit 17 calculates the difference between the temperature of the middle housing 1b detected by the sensor 6 and the temperature of the rear housing 1c detected by the sensor 16, and the heating amount of the temperature of the discharge gas by the motor Thus, by estimating the coil temperature of the motor unit 2, the temperature of the coil 7 can be detected more accurately.

 Also in this embodiment, as in the first embodiment, since the temperature of the coil 7 is not directly detected, there is no need to install the sensors 6 and 16 in the housing 1, and the electric compressor 5 can be prevented from being enlarged. Furthermore, since the housing 1 is not provided with a through hole when the harness 6d is pulled out from the sensors 6 and 16, the sealing performance can be ensured and the temperature of the coil 7 can be estimated without impairing the sealing performance. Further, since the seal structure is not necessary, the manufacturing process of the electric compressor 5 can be simplified.

DESCRIPTION OF SYMBOLS 1 Housing 1a Front housing 1b Middle housing 1c Rear housing 2 Motor part 3 Compression part 4 Inverter part 5 Electric compressor 6 Sensor 7 Coil

Claims (2)

A substantially cylindrical housing (1) comprising a front housing (1a), a middle housing (1b) and a rear housing (1c), a motor part (2) accommodated in the rear housing (1c), and the middle housing A compression part (3) accommodated in (1b) and an inverter part (4) accommodated in the front housing (1a), and the refrigerant gas is compressed by the compression part (3) in the housing (1). An electric compressor (5) that is cooled and cooled by the motor part (2) by the refrigerant gas
A sensor (6) for detecting the temperature of the middle housing (1b) is provided on the outer periphery of the middle housing (1b) touched by discharge gas for cooling the motor part (2),
An electric compressor (5) characterized in that the inverter (4) is provided with an estimation means for estimating the temperature of the coil (7) from the detection result of the sensor (6). The electric compressor (5) according to claim 1,
A sensor (16) for detecting the temperature of the rear housing (1c) is provided on the outer periphery of the rear housing (1c),
The estimation means calculates the difference between the temperature of the middle housing (1b) detected by the sensor (6) and the temperature of the rear housing (1c) detected by the sensor (16), and calculates the motor part (2 The electric compressor (5) characterized by estimating the temperature of the coil (7).

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