JP4747941B2 - Electric compressor - Google Patents

Description

  The present invention relates to an electric compressor, and more particularly to a pump for circulating a lubricating liquid.

  In order to prevent the entry of foreign matter such as fine sand, iron powder, and copper powder from the refrigeration cycle into the compressor, it has been conventionally adopted as a relatively simple means to install a filter in the suction pipe in front of the compressor. However, a technique is disclosed in which foreign matter generated in the compressor is not guided to the oil pump unit or the compression mechanism unit (see, for example, Patent Document 1).

  FIG. 3 is a cross-sectional view of a conventional compressor. The operation will be described. When the sealed terminal 181 is energized, the motor 107 is driven, and the main shaft 103 rotates in synchronization therewith. Accordingly, the fluid gas is compressed by the cooperative action of the orbiting scroll 102 and the fixed scroll 101 oscillating. Further, when the main shaft 103 rotates, the oil pump unit 132 is interlocked. Thus, the lubricating oil in the oil reservoir 186 is directly supplied to the sliding portion including the compression mechanism portion through the oil supply passage provided in the main shaft 103, and lubricates the sliding portion.

In Patent Document 1, by providing the filter 136 in the pipe portion 143 that guides the lubricating oil to the oil pump portion 132, foreign matters that are generated in the compressor and mixed in the lubricating oil in the oil reservoir are captured by the filter 136 and oil. Abnormal wear and seizure of the bearing portion or failure of the oil pump portion is prevented by not being guided to the pump portion and the compression mechanism portion.
Japanese Patent Laid-Open No. 06-235387

  By the way, the compressor built in the container as described above is mounted for air conditioning of automobiles, and some electric compressors for room air conditioners are also used. There is a demand for lighter vehicles. In particular, since the driving force at the level of a gasoline vehicle cannot be obtained during electric driving in an electric vehicle or a hybrid vehicle, weight reduction of the vehicle has become the most important issue. Therefore, compressors that are relatively heavy objects, especially electric compressors that incorporate a motor that increases in size and weight, are as important issues as mounting in a vehicle, as small and light as a vehicle. .

  However, in the mounting structure adopted by the conventional compressor, in order to attach the filter to the pipe part, the space of the filter itself must be secured in the pipe part, and a mechanism for mounting and fixing is also required. Space is required and the number of parts increases. If it becomes so, since the axial direction space which occupies in the container of a compressor becomes large, it has the subject that it becomes the obstruction of diameter reduction and weight reduction.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a compressor that can form a filter in a small space, has a small number of parts, and can be further reduced in size, weight, and cost.

In order to solve the conventional problems, an electric compressor according to the present invention includes, in a container, a compression mechanism that performs suction, compression, and discharge of refrigerant, a motor that drives the compression mechanism, and a compression mechanism. A liquid storage part for storing liquid for lubricating the sliding part, a pump for sucking up the liquid stored in the liquid storage part, and a suction passage are provided. The pump includes a pump plate, a pump case, a rotor, and a filter. The pump plate and the filter are integrally formed.

  In this electric compressor, the foreign matter mixed in from the refrigeration cycle and the foreign matter mixed in the liquid storage part generated in the compressor are guided to the pump together with the lubricating oil from the liquid storage part through the suction passage. However, it is captured by the filter integrated with the pump plate, and only the lubricating oil is guided to the pump part and the compression mechanism part to lubricate the sliding part, and the filter is configured with less space and fewer parts. I can do it.

  The compressor of the present invention can satisfy the improvement in reliability and low cost by oil lubrication while achieving reduction in size and weight.

  The present invention stores in a container a liquid that is intended to lubricate a sliding mechanism including a compression mechanism section that sucks, compresses and discharges refrigerant, a motor section that drives the compression mechanism section, and the compression mechanism section. A liquid storage part, a pump for sucking up the liquid accumulated in the liquid storage part, and a suction passage; and the pump has a pump plate, a pump case, a rotor, and a filter, and the pump plate and the filter are integrated with each other. Foreign matter mixed in the liquid storage part is guided from the liquid storage part together with the lubricating oil to the pump part through the suction passage, and only the foreign substance is first captured by the filter integrated with the pump plate. In addition, since the filter can be configured with a small space and a small number of parts, it is possible to reduce the size, weight, and cost.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a cross-sectional view of the electric compressor according to Embodiment 1 of the present invention. FIG. 1 shows one example in the case of a horizontal type electric compressor installed sideways by a mounting leg 2 around a body portion of the electric compressor 1. The electric compressor 1 includes a main body casing 3. An electric motor 4 is housed therein, and a compression mechanism 5 that is fitted or press-fitted into the main body casing 3 is driven. The electric motor 4 is driven by an inverter 7 incorporated in an inverter case 6. Further, the main body casing 3 is provided with a liquid storage section 8 for storing a liquid used for lubricating each sliding section including the compression mechanism section 5. The refrigerant to be handled is a gas refrigerant, and lubricating oil 9 is used as a liquid to be used for lubrication of each sliding portion and for sealing the sliding portion of the compression mechanism portion 5.

  The compression mechanism unit 5 of the electric compressor 1 of the present embodiment is of a scroll type. The compression space 10 formed by meshing the fixed scroll 11 and the orbiting scroll 12 whose blades rise from the fixed end plate 11a and the orbiting end plate 12a, respectively. When the circular orbital motion is performed, the refrigerant 14 returning from the external cycle by changing the volume with movement is sucked, compressed, and discharged to the external cycle to the suction port 15 and the main body casing 3 provided in the inverter case 6. This is performed through the provided discharge port 16.

Hereinafter, the configuration will be described in detail. In FIG. 1, a main bearing member 20 having an oil supply pump 17, an auxiliary bearing 18, an electric motor 4, and a main bearing 19 is disposed from one end wall 3 a side in the axial direction in the main body casing 3. The oil supply pump 17 is accommodated from the outer surface of the end wall portion 3a and is held between the lid body 21 and the pump body 22 that leads to the liquid storage section 8 inside the lid body 21 to form a suction passage. 23 to communicate with the liquid storage unit 8. The auxiliary bearing 18 is supported by the end wall 3a and pivotally supports the side of the drive shaft 13 connected to the oil pump 17.
The electric motor 4 is configured such that the stator 4 a is shrink-fitted and fixed to the main body casing 3, or is fixed by the annular member 24, and the drive shaft 13 can be rotationally driven by the rotor 4 b fixed around the drive shaft 13. Yes. An oil supply passage 25 is formed inside the drive shaft 13.

  The main bearing member 20 is fixed by a fixed scroll 11 and a bolt (not shown) and is held by an inverter case 6 fitted to the opening side of the main body casing 3, and the compression mechanism portion 5 side of the drive shaft 13 is held on the main bearing. 19 is pivotally supported. Further, the scroll compressor is configured by sandwiching the orbiting scroll 12 between the main bearing member 20 and the fixed scroll 11. Between the main bearing member 20 and the orbiting scroll 12, a rotation restraining portion for preventing the rotation of the orbiting scroll 12 such as the Oldham ring 26 and causing the circular movement is provided, and the drive shaft 13 is orbited via the eccentric bearing 27. Connected to the scroll 12, the orbiting scroll 12 can be turned on a circular path.

  The inverter 7 includes a circuit board 32 and an electrolytic capacitor (not shown) on the opposite surface of the suction chamber 28 in the partition wall 6 a of the inverter case 6. Further, an IPM (intelligent power module) heat generating component 33 including a switching element having a high heat generation degree is mounted on the circuit board 32 so as to be in thermal contact with the partition wall 6a. The inverter 7 is electrically connected to the electric motor 4 via a compressor terminal 35 connected by a harness connector 34, and is driven by the inverter 7 while monitoring necessary information such as temperature. is there. A cover 36 is provided so as to cover the inverter 7.

  Further, in the first embodiment, the oil supply pump 17 uses a trochoid pump. FIG. 2 is an exploded perspective view of the oil supply pump of the electric compressor according to Embodiment 1 of the present invention. In FIG. 2, the pump case 41 that houses the oil pump 17 is formed by digging the end wall 3 a, and a concave fitting portion 42 is formed at a position that is eccentric by a predetermined amount with respect to the axis of the pump case 41. The trochoidal tooth-shaped inner rotor 43 and outer rotor 44 are accommodated in the recessed fitting portion 42. The oil supply passage inlet 25 a is formed in a planar shape with a part of the side surface cut off, and is detachably fitted to a locking hole 43 a formed in the center of the inner rotor 43. As a result, the inner rotor 43 rotates in synchronization with the drive shaft 13.

  A pump plate 45 is disposed so as to cover them, and the pump plate 45 is pierced so as to be connected to an inlet port 45a that penetrates to suck the lubricating oil 9 and an oil supply passage inlet 25a of the drive shaft 13 on the back surface. An exit port (not shown) is formed. Further, a filter 46 for preventing entry of foreign matters such as iron powder is disposed on the front surface where the lubricating oil 9 enters by the pump plate 45. In this structure, a flange 45b is formed around the front surface of the pump plate 45, and a filter 46 formed in a ring matching the inner diameter of the flange 45b is integrally formed. A lid 21 is fitted in front of the filter 46 so as to form a pump chamber 22 that communicates with the liquid storage section 8 through the suction passage 23.

  Based on the above configuration, the operation of the electric compressor in the first embodiment will be described. The electric motor 4 is driven by the inverter 7 and moves the compression mechanism 5 in a circular orbit via the drive shaft 13 and drives the oil supply pump 17. At this time, the compression mechanism unit 5 is supplied with the lubricating oil 9 of the liquid storage unit 8 through the oil supply passage 25 of the drive shaft 13 by the oil supply pump 17 and receives the lubrication and sealing action, and is refrigerated through the suction port 15 provided in the inverter case 6. Inhale the return refrigerant from the cycle. The sucked refrigerant 14 cools the partition wall 6a over a wide range in the space of the suction chamber 28 and exchanges heat with a heat-generating component 33 such as an IPM mounted on the back surface of the partition wall 6a. It flows into the compression space 10 via a not-shown). The refrigerant 14 is compressed in the compression space 10 and discharged from the discharge hole 29 to the discharge chamber 30.

  The refrigerant discharged into the discharge chamber 30 enters the motor 4 side through a communication passage 31 formed between the groove 41 provided on the outer peripheral portion of the fixed scroll 11 and the inner peripheral surface of the main casing 3. In the long process until cooling is discharged from the discharge port 16 of the main casing 3, the refrigerant is accompanied by the separation of the lubricating oil 9 by performing various gas-liquid separations such as collision, centrifugation, and throttling. The auxiliary bearing 18 is also lubricated by a part of the lubricating oil 9.

  At this time, foreign matter mixed from the refrigeration cycle via the refrigerant 14 and foreign matter such as iron powder mixed in the liquid storage portion 8 generated in the electric compressor 1 are sucked up from the liquid storage portion 8 together with the lubricating oil 9. 54 is guided to the oil supply pump 17, and only foreign matters are first captured by the filter 46 integrated with the pump plate 45, and only the lubricating oil 9 passes through the oil supply pump 17 and the oil supply passage 25 and is compressed. The sliding part is lubricated by being guided to 5.

  According to the above configuration, since the filter can be configured with a small space and a small number of parts, the weight, size, and cost can be reduced.

  As described above, since the electric compressor according to the present invention is compact and can improve the reliability related to oil lubrication, it can be applied to a compressor without a built-in motor.

Sectional drawing of the electric compressor in Embodiment 1 of this invention 1 is an exploded perspective view of an oil pump for an electric compressor according to Embodiment 1 of the present invention. Cross section of a conventional compressor

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electric compressor 3 Main body casing 4 Electric motor 5 Compression mechanism part 8 Liquid storage part 9 Lubricating oil 11 Fixed scroll 12 Turning scroll 13 Drive shaft 14 Refrigerant 17 Oil supply pump 41 Pump case 43 Inner rotor 44 Outer rotor 45 Pump plate 46 Filter

Claims (1)

A liquid storage for storing a liquid for achieving lubrication or the like in a compression mechanism section that sucks, compresses and discharges the refrigerant, a motor section that drives the compression mechanism section, and a sliding section that includes the compression mechanism section. , A pump for sucking up the liquid accumulated in the liquid storage part, and a suction passage, wherein the pump has a pump plate formed with a flange standing on a peripheral suction side surface, and a pump plate on the side opposite to the suction surface of the pump plate. A filter having a pump case and a rotor arranged, and formed on a ring that matches the inner diameter of the flange is integrally formed with the pump plate, and a lid is in contact with the end of the flange. A featured electric compressor.