JP2013064343A - Inverter device-integrated electric compressor - Google Patents

Abstract

An inverter device-integrated electric compressor capable of cooling an inverter device with suction refrigerant without adjusting operating conditions of a refrigeration cycle is provided.
An inverter-integrated electric compressor equipped with an inverter device (not shown) cooled by suction refrigerant is provided with a suction refrigerant passage 61 through which all of the suction refrigerant flows. It has a port 8 and a passage hole 71, and is provided with a narrowed portion in the passage cross-sectional area between the suction port 8 and the passage hole 71, so that the suction refrigerant is the shortest path from the suction port 8 to the passage hole 71. The suction refrigerant is diffused throughout the suction refrigerant passage 61, and the cooling action by the suction refrigerant is sufficiently exhibited. As a result, the inverter device can be sufficiently cooled with the suction refrigerant, and adjustment of the operating conditions of the refrigeration cycle is not necessary.
[Selection] Figure 3

Description

  The present invention relates to an inverter unit integrated electric compressor in which an electric compressor unit that sucks, compresses, and discharges refrigerant and an inverter device that drives the electric motor of the electric compressor unit are integrated.

  Various inverter device-integrated electric compressors equipped with an inverter device cooled by a suction refrigerant have been proposed (see, for example, Patent Document 1).

  4 is a longitudinal sectional view of a conventional inverter device-integrated electric compressor described in Patent Document 1, FIG. 5 is an exploded view of the cooling passage space of the inverter device-integrated electric compressor, and FIG. FIG. 3 is an exploded structural view of the inverter case of the inverter device-integrated electric compressor on the circuit board side.

  FIG. 4 shows the horizontal electric compressor 1 installed sideways by the mounting legs 2 around the body of the electric compressor 1, and the inverter device 301 is mounted on the left side of the electric compressor 1. .

  The electric compressor 1 will be described. The electric compressor 1 incorporates an electric motor 5 in its main body casing 3, and the electric motor 5 drives a compression mechanism unit 4 that is fitted or press-fitted into the main body casing 3. The electric motor 5 is driven by the inverter device 301. As shown in FIG. 4, the compression mechanism unit 4 is of a scroll type, and is configured by meshing a fixed spiral part 11 and a swirl spiral part 12 whose blades rise from the fixed mirror plate 11a and the swivel mirror plate 12a, respectively. It is.

  The compression mechanism unit 4 is configured such that when the swirl spiral part 12 is circularly orbitally moved with respect to the fixed spiral part 11 via the drive shaft 14 by the electric motor 5, the volume of the compression space 10 changes as the movement proceeds. The refrigerant 30 returning from the external cycle is sucked and compressed, and discharged to the external cycle.

  The inverter case 302 is provided with a suction port 8, and the main body casing 3 is provided with a discharge port 9. The refrigerant to be handled is a gas refrigerant, and a liquid such as a lubricating oil 7 is employed as a liquid to be used for lubrication of each sliding part and a seal of the sliding part of the compression mechanism part 4. The lubricating oil 7 is compatible with the refrigerant.

  The lubricating oil 7 stored in the liquid storage part 6 of the main casing 3 is supplied to the compression mechanism part 4 by the positive displacement pump 13. That is, when the positive displacement pump 13 is driven by the electric motor 5, the lubricating oil 7 is supplied to the liquid reservoir 21 on the back surface of the swirl spiral portion 12 through the oil supply passage 15 of the drive shaft 14 and supplied to the liquid reservoir 21. Part of the lubricating oil 7 is limited to a predetermined amount through the swirl swirl 12 on the back side of the outer peripheral portion of the swirl swirl 12, and backs up the swirl swirl 12.

  A part of the lubricating oil 7 is further supplied to a holding groove 25 that holds a tip seal 24 that is an example of a seal member between the blades of the swirl swirl 12 and the fixed swirl 11 at the tip of the swirl swirl 12 through the swirl swirl 12. Then, sealing and lubrication between the fixed spiral part 11 and the swirl spiral part 12 are achieved. Further, another part of the lubricating oil 7 supplied to the liquid reservoir 21 is lubricated with the main bearing 42 and the eccentric bearing 43 through the eccentric bearing 43, the liquid reservoir 22 and the main bearing 42, and then the motor 5 side. And is collected into the liquid storage unit 6.

  The main casing 3 is provided with a main bearing member 51 having a pump 13, a secondary bearing 41, an electric motor 5, and a main bearing 42 from one end wall 3 a side in the axial direction. The pump 13 is held from the outer surface of the end wall portion 3a and is held between the lid body 52 and the pump body 53, and a pump chamber 53 leading to the liquid storage section 6 is formed inside the lid body 52. The liquid storage section 6 is communicated with the suction passage 54.

  The electric motor 5 is configured such that the stator 5a is shrink-fitted and fixed to the main body casing 3 or is fixed by the annular member 17 so that the drive shaft 14 can be rotationally driven by the rotor 5b fixed around the drive shaft 14. Yes. The main bearing member 51 is fixed to the fixed spiral portion 11 by a bolt (not shown) or the like, is fitted to the opening end of the main casing 3, and is clamped by the inverter case 302. Are supported by the main bearing 42.

  Further, a scroll compressor is configured by sandwiching the swirl spiral portion 12 between the main bearing member 51 and the fixed spiral portion 11. Between the main bearing member 51 and the swirl spiral part 12, a rotation restraining part for preventing the swirl spiral part 12 such as an Oldham ring 57 from rotating and causing a circular motion is provided, and the drive supported by the eccentric bearing 43 is supported. It is connected to the swirl spiral part 12 via the shaft 14 so that the swirl spiral part 12 can be swung on a circular orbit.

  The compression mechanism section 4 is provided with a discharge hole 31 and a reed valve 31a, and the discharge hole 31 is opened to a discharge chamber 62 constituted by a fixed end plate 11a and a lid body 65. The discharge chamber 62 communicates with the electric motor 5 through the fixed spiral portion 11 and the main bearing member 51 or a communication passage 63 formed between them and the main casing 3. Then, in the long process until the electric motor 5 is cooled and discharged from the discharge port 9 of the main body casing 3, the refrigerant is subjected to various gas-liquid separations such as collision, centrifugation, throttling, and the like, while receiving the separation of the lubricating oil 7. However, the auxiliary bearing 41 is also lubricated by the accompanying partial lubricating oil 7.

  Next, the inverter device 301 will be described. The inverter device 301 is configured to accommodate the circuit board 103, the current smoothing capacitor 108, and the like on the opposite side of the discharge chamber 62 of the inverter case 302, and the circuit board 103 includes an IPM (switching element serving as a main heat source). Intelligent power module) 105 is mounted.

  The lead wire 81 from the electric motor 5 is connected to the harness connector 107 through a communication passage 82 provided in the vicinity of the outer periphery of the fixed end plate 11a, and is inserted and fixed to the compressor terminal 106. The circuit board 103 is electrically connected to the compressor terminal 106. Then, the motor 5 is driven while monitoring the temperature of the IPM 105, the temperature of the motor 5, and the like. The temperature is monitored by a temperature sensor (not shown) and a control circuit on the circuit board 103. The compressor terminal 106 is fixed to the inverter case 302 by the Tomewa 80. The inverter device 301 is provided with a harness connector (not shown) for electrical connection with the outside.

  The inverter case 302 is closed with an inverter cover 113. That is, the inverter case 302 is passed through the screw hole 115 of the inverter cover 113 through the screw hole 115 and fixed by tightening the screw 55 to protect the inverter device 301 from external force. The inverter case 302 is fastened to the main casing 3 in an airtight manner by sandwiching the O-ring 91 with bolts (not shown) passing through the bolt through holes 116. A sheet material 120 having a sound insulation and vibration control effect is attached to the inner surface of the inverter cover 113, and noise generated from the electric motor 5 or the compression mechanism unit 4 is transmitted through the inverter cover 113 and radiated to the outside. Is prevented.

  A cooling structure of the inverter device 301 configured as described above will be described. When the inverter case 302 and the fixed end plate 11 a of the fixed spiral part 11 are combined in an airtight manner using an O-ring 92, the suction refrigerant passage 361 that leads from the suction port 8 is the end of the inverter case 302 on the compression mechanism part 4 side. It is formed over almost the entire area of the wall 302a. The refrigerant sucked from the suction port 8 is diffused throughout the suction refrigerant passage 361, cools the end wall 302a on the compression mechanism section 4 side, and heats with a heating element such as the IPM 105 mounted on the back surface. After the replacement, it flows into the compression space 10 through the passage hole 71 of the fixed end plate 11a.

JP 2009-97503 A

  However, the cooling structure of the inverter device of the conventional inverter device-integrated electric compressor has the following problems.

  In other words, in the above configuration, the suction refrigerant flows from the suction port 8 through the suction refrigerant passage 361 formed almost all over the compression mechanism portion 4 of the inverter case 302 into the passage hole 71 serving as the outlet portion. Therefore, the suction refrigerant passes through the shortest path from the suction port 8 to the passage hole 71. That is, the suction refrigerant is not diffused throughout the suction refrigerant passage 361, and the cooling action by the suction refrigerant is not sufficiently exhibited.

  In such a case, the operating conditions of the refrigeration cycle are adjusted, for example, adjustment of an expansion valve, adjustment of the air flow rate of the heat exchanger, adjustment of the electric compressor rotation speed, etc. (not shown). As a result, the cooling effect is enhanced, but since the operating conditions of the refrigeration cycle are adjusted, the comfort of the air conditioning is impaired or the operating efficiency is reduced. In addition, there is a problem that operation control of the refrigeration cycle becomes complicated.

  The present invention solves such a conventional problem, and provides an inverter device-integrated electric compressor capable of sufficiently cooling an inverter device with suction refrigerant without adjusting operating conditions of a refrigeration cycle. Objective.

  In order to solve the above-described problems, an inverter device-integrated electric compressor according to the present invention is an inverter device-integrated electric compressor equipped with an inverter device that is cooled by suction refrigerant. The intake refrigerant passage has an inlet portion and an outlet portion, and a portion that is narrowed in a cross-sectional area of the passage between the inlet portion and the outlet portion is provided. It is possible to prevent passing through the shortest route. That is, the suction refrigerant is diffused throughout the suction refrigerant passage, and the cooling action by the suction refrigerant is sufficiently exerted. As a result, the inverter device can be sufficiently cooled with the suction refrigerant, and adjustment of the operating conditions of the refrigeration cycle is not necessary.

  The inverter apparatus-integrated electric compressor of the present invention can reliably cool the inverter apparatus with the suction refrigerant without adjusting the operating condition of the refrigeration cycle.

1 is a longitudinal sectional view of an inverter device-integrated electric compressor according to Embodiment 1 of the present invention. Enlarged sectional view around the suction refrigerant passage of the inverter-integrated electric compressor Exploded structure of cooling passage space of the inverter-integrated electric compressor Longitudinal sectional view of a conventional inverter-integrated electric compressor Exploded structure of cooling passage space of the inverter-integrated electric compressor An exploded view of the inverter case of the inverter unit integrated electric compressor on the circuit board side

  According to a first aspect of the present invention, there is provided an inverter device-integrated electric compressor including an inverter device that is cooled by a suction refrigerant, wherein the suction refrigerant passage through which all of the suction refrigerant flows is provided, and the suction refrigerant passage includes an inlet portion and an outlet portion. And having a narrowed portion in the cross-sectional area of the passage between the inlet portion and the outlet portion, it is possible to prevent the intake refrigerant from passing through the shortest path from the inlet portion to the outlet portion. That is, the suction refrigerant is diffused throughout the suction refrigerant passage, and the cooling action by the suction refrigerant is sufficiently exerted. As a result, the inverter device can be sufficiently cooled with the suction refrigerant, and adjustment of the operating conditions of the refrigeration cycle is not necessary.

  In the second invention, in particular, the cross-sectional area of the suction refrigerant passage of the first invention is provided so as to increase from the inside to the outside, and the suction refrigerant passes through the shortest path from the inlet to the outlet. Can be prevented. That is, the suction refrigerant is diffused from the inside to the outside and passes through a long distance of the outer peripheral portion, so that the suction refrigerant can flow more in the outer peripheral portion where the distance of the heat radiating portion is longer, and the cooling action by the suction refrigerant is sufficient. Demonstrated. As a result, the inverter device can be sufficiently cooled with the suction refrigerant, and adjustment of the operating conditions of the refrigeration cycle is not necessary.

  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 longitudinal sectional view of an inverter device-integrated electric compressor according to Embodiment 1 of the present invention, FIG. 2 is an enlarged sectional view of the vicinity of an intake refrigerant passage of the inverter device-integrated electric compressor, and FIG. It is an exploded structure figure of the cooling passage space of the inverter device integrated electric compressor.

  1 to 3, the difference between the inverter-integrated electric compressor in the present embodiment and the conventional inverter-integrated electric compressor is that the periphery of the suction refrigerant passage is changed. Different parts are marked with different symbols. Specifically, the inverter device 301 is changed to the inverter device 151, the inverter case 302 is changed to the inverter case 152, and the end wall 302a is changed to the end wall 152a. Hereinafter, the same parts as those of the conventional inverter-unit-integrated electric compressor will be denoted by the same reference numerals, and description thereof will be omitted, and only different parts will be described.

  The inverter apparatus-integrated electric compressor according to the present embodiment has an intake refrigerant passage that leads from the intake port 8 by airtightly combining the inverter case 152 and the fixed end plate 11a of the fixed spiral part 11 using an O-ring 92. 61 is formed.

  That is, in the above configuration, the refrigerant sucked from the suction port 8 that is the inlet portion is diffused into the suction refrigerant passage 61 and cools the end wall 152a. Here, as shown in FIG. 3, the cross-sectional area of the intake refrigerant passage 61 is wide on the upper side and narrow on the lower side to be a narrow portion. For this reason, the suction refrigerant can be prevented from passing through the shortest path from the suction port 8 to the passage hole 71 as the outlet.

The intake refrigerant passes through a long distance on the outer peripheral portion of the inverter case 152, so that a large amount of the heat dissipation portion flows in the outer peripheral portion where the distance of the heat radiation portion is long, and the cooling action by the intake refrigerant is sufficiently exhibited. Although not shown in the drawing, a higher cooling effect can be expected by providing a radiating fin in the suction refrigerant passage 61.

  As described above, according to the inverter apparatus-integrated electric compressor in the present embodiment, the inverter apparatus can be efficiently cooled with the suction refrigerant without adjusting the operating condition of the refrigeration cycle.

  Note that the main heat source is not limited to the IPM 105, and individual switching elements may be arranged discretely.

  As described above, the inverter device integrated electric compressor according to the present invention can cool the inverter device with the suction refrigerant without adjusting the operating condition of the refrigeration cycle. It can be applied to an apparatus-integrated electric compressor.

DESCRIPTION OF SYMBOLS 1 Electric compressor 3 Main body casing 4 Compression mechanism part 5 Electric motor 8 Inlet (inlet part)
DESCRIPTION OF SYMBOLS 11 Fixed spiral part 11a Fixed end plate 30 Refrigerant 52, 65 Cover body 61 Intake refrigerant path 71 Passage hole (outlet part)
151 Inverter device

Claims (2)

In an inverter device-integrated electric compressor equipped with an inverter device cooled by suction refrigerant, an suction refrigerant passage through which all of the suction refrigerant flows is provided, the suction refrigerant passage having an inlet portion and an outlet portion, and the inlet portion An inverter apparatus-integrated electric compressor, wherein a narrowed portion is provided in a cross-sectional area of the passage between the outlet and the outlet portion. The inverter device-integrated electric compressor according to claim 1, wherein a cross-sectional area of the suction refrigerant passage is provided so as to increase from the inside to the outside.