JP4440321B2 - Horizontal electric compressor - Google Patents

Description

The present invention relates to a horizontal electric compressor.

  Patent Document 1 describes an “electric gas compressor”.

  This electric gas compressor (electric compressor) is used in a cooling system for a vehicle air conditioner, and includes a compressor that compresses refrigerant and an electric motor that drives the compressor. The electric compressor is generally configured to cool by flowing a refrigerant to the stator side of the electric motor.

6 to 8 show an electric compressor 201 that cools the stator with a refrigerant. As shown in FIGS. 6 and 7, the electric compressor 201 includes a compressor 203 and an electric motor 205 that drives the compressor 203. Two refrigerant introduction paths 207, 207 are provided, and the refrigerant 211 is blown and cooled from each refrigerant introduction path 207 to the stator 209 of the electric motor 205 as shown in FIG.
JP 2005-344657 A

  However, in the electric compressor 201, the refrigerant introduction paths 207 are provided only in two places with respect to the nine stators 209, so that the flow of the refrigerant 211 with respect to the stator 209 is biased as shown in FIG. It is not possible to cool by uniformly blowing the refrigerant 211 to all the stators 209.

  As a result, there is a problem in that the temperature of the stator 209 that is insufficiently cooled increases under the condition that a large load is applied to the electric compressor 201, and the performance of the electric motor 205 and the compressor 203 deteriorates.

Accordingly, an object of the present invention is to provide a horizontal electric compressor that uniformly and sufficiently cools a stator of an electric motor and prevents a decrease in performance even at a high load.

The horizontal electric compressor 1 according to claim 1 is an electric motor having a compressor configured to compress a refrigerant, and a stator configured by individually winding a coil around a ferromagnetic core that drives the compressor. When, and a housing fixed to one another by bolts, the refrigerant circumfluence path flow refrigerant is you inflows distribution port of the compressor is provided, the partition wall of the receiving chamber of the electric motor and the coolant whirling passage, the refrigerant formed but is introduced into the stator side of the electric motor, the refrigerant inlet discharge passage provided in the formed partition walls in the housing, an opening of the refrigerant inlet discharge passage is positioned along the circumferential direction of the receiving chamber In addition , the refrigerant introduction / discharge path includes a plurality of circular holes, and the number of the circular holes is more than the number of circulation ports, and the same number of refrigerant introduction / discharge paths as the stator coils are provided.

Claim 2 horizontal electric compressor 1 according to is a horizontal electric compressor 1 according to claim 1, wherein the refrigerant introduction discharge passage 19, characterized by being arranged respectively opposite to the stator 17.

  In the present invention, a refrigerant circulation passage is provided to divide the refrigerant into refrigerant introduction / exhaust passages having a larger number than the circulation ports and distribute them to the stator side of the electric motor (the refrigerant introduction / exhaust passages for cooling the stator are arranged based on the number of circulation ports. Therefore, it is possible to reduce the unevenness of the refrigerant given to the stator. Therefore, the cooling efficiency is improved more than the flow of the refrigerant discharged from the compressor to the stator side as it is, and each stator is made uniform and Can be cooled sufficiently.

  As a result, even under a condition in which a large load is applied to the electric compressor, the temperature rise of the stator and the performance reduction of the electric motor are prevented, and the performance of the compressor is maintained high.

Further, by providing the same number of refrigerant introduction / discharge paths as the stator coils (for example, nine refrigerant introduction / discharge paths if there are nine stators of the electric motor), each stator introduces a dedicated refrigerant introduction. Since it is sufficiently cooled by the discharge path, even if a heavy load is applied, the temperature of the stator and the performance of the electric motor are prevented from being lowered, and the performance of the compressor is maintained high.

  Furthermore, since each refrigerant introduction / discharge path is arranged opposite to each stator, each stator is uniformly and sufficiently cooled by the refrigerant blown directly from the dedicated refrigerant introduction / discharge path, and a large load is applied to the electric compressor. Even if it is applied, the temperature of the stator and the performance of the electric motor are prevented from being lowered, and the performance of the compressor is kept high.

<First embodiment>
A horizontal electric compressor 1 according to a first embodiment will be described with reference to FIGS. 1 is a longitudinal sectional view of a horizontal electric compressor 1, FIG. 2 is a perspective view of a rear block 33 of the compressor 3, FIG. 3 is a sectional view taken along line AA in FIG. 1, and FIG. 3 is a perspective view of the electric motor 5.

The horizontal electric compressor 1 includes a compressor 3 (vane compressor) that compresses refrigerant and an electric motor 5 that drives the compressor 3, and is discharged from a discharge port (distribution port) 7 of the compressor 3. A refrigerant circulation path 11 into which the refrigerant 9 (FIG. 5) flows is provided, and the refrigerant 9 is introduced into the partition wall 15 between the storage chamber 13 of the electric motor 5 and the refrigerant circulation path 11 on the stator 17 side of the electric motor 5. More cooling refrigerant introduction paths (refrigerant introduction / discharge paths) 19 than the number of discharge ports 7 are provided, the same number of refrigerant introduction / discharge paths 19 as the stator 17 are provided, and the refrigerant introduction / discharge paths 19 are opposed to the stator 17. It is characterized by having arranged.

Next, the structure of the horizontal electric compressor 1 will be described.

The horizontal electric compressor 1 is used in a cooling system for a vehicle air conditioner. The high-temperature and high-pressure refrigerant gas adiabatically compressed by the horizontal electric compressor 1 is liquefied by a condenser (condenser) and is throttled by an expansion valve. It expands, exchanges heat with an evaporator (evaporator), is heated and vaporized while producing cold air, and returns to the horizontal electric compressor 1 for adiabatic compression. The discharge amount adjustment of the horizontal electric compressor 1 is performed according to the change in the heat load of the cooling system. In addition, an appropriate amount of lubricating oil is mixed in the refrigerant.

The horizontal electric compressor 1 includes a compressor 3, an electric motor 5, a drive circuit unit 21 that controls the rotation speed of the electric motor 5 in accordance with a change in heat load, and the like. The compressor 3 is accommodated in the middle housing 25, the electric motor 5 is accommodated in the rear housing 27, and the housings 23, 25, 27 are fixed to each other with bolts.

  The compressor 3 includes a front block 29, a cylinder block 31, a rear block 33, a rotor shaft 35, a rotor 37, a plurality of vanes 39, and the like. Each block 29, 31, 33 is fixed to the middle housing 25 by a bolt, and the left end portion and the center portion of the rotor shaft 35 are rotatably supported by the front block 29 and the rear block 33. The cylinder block 31 is formed with a cylinder chamber 41 whose inner periphery is substantially elliptical in cross section, and the rotor shaft 35 is arranged concentrically with the ellipse. The rotor 37 is fixed to the rotor shaft 35, and each vane 39 is supported by the rotor 37 by a vane groove in a radial direction provided at equal intervals in the circumferential direction.

  A plurality of pump chambers are formed between the cylinder chamber 41 and the outer peripheral surface of the rotor 37 and each vane 39, and when the compressor 3 is driven and the rotor 37 rotates, each vane 39 is supplied to the bottom of the centrifugal force and the vane groove. In response to the back pressure, the top moves in the radial direction while sliding the top into the cylinder chamber 41. The volume of each pump chamber changes with the rotation of the rotor 37 and the radial movement of the vane 39, and by this volume change, the refrigerant suction stroke, compression stroke, and discharge stroke are repeated. The refrigerant sucked and discharged in the discharge process is discharged to the discharge port 7 in the compression process.

  The electric motor 5 includes a stator 17, a rotor 45 made of a magnetic material, a motor shaft 47, and the like. The stator 17 is made by winding a coil 49 (FIG. 5) around a ferromagnetic core, and nine stators 17 are arranged around the inner periphery of the rear housing 27 as shown in FIGS. 1 and 5. It is fixed in the direction. The rotor 45 is press-fitted and fixed on the motor shaft 47, and the left end portion of the motor shaft 47 is connected to the right end portion of the rotor shaft 35 of the compressor 3, and is supported on the middle housing 25 by the ball bearing 51 together with the rotor shaft 35. The right end is supported on the rear housing 27 by a ball bearing 53.

  Two discharge ports 7 are provided in the rear block 33 at equal intervals in the circumferential direction. As shown in FIGS. 3 and 4, the partition wall 15 is formed in the middle housing 25, and the partition wall 15 includes nine (stator). The same number of refrigerant introduction paths 19 are provided at equal intervals in the circumferential direction, and each refrigerant introduction path 19 is disposed to face each stator 17. As shown in FIGS. 1 to 3, the refrigerant circulation passage 11 is formed between the rear block 33 and the middle housing 25 (partition wall 15), and has two discharge ports 7 and nine refrigerant introductions. The road 19 is in communication with each other.

  The rotation of the electric motor 5 is transmitted from the motor shaft 47 to the rotor shaft 35 (rotor 37) to drive the compressor 3. The compressor 3 discharges the compressed refrigerant to the discharge port 7, and the discharged refrigerant is circulated in the refrigerant. It flows into the path 11. The refrigerant that has flowed into the refrigerant circulation passage 11 is distributed to nine refrigerant introduction paths 19 as shown in FIGS. 3 and 4, and as shown in FIG. These are blown toward the child 17 to cool them.

  Below the middle housing 25 and the rear housing 27, there is provided an oil reservoir 55 that supplies oil to a portion requiring lubrication, such as a support portion of the rotor shaft 35 and bearings 51 and 53, and lubricates and cools. This oil is accumulated in the lower part of the storage chamber 13 of the electric motor 5. The refrigerant flowing into the storage chamber 13 from each refrigerant introduction path 19 cools the stator 17, and then separates the oil with an oil separator. It is discharged from the discharge port 57 of the rear housing 27 and sent to the capacitor side.

Next, the effect of the horizontal electric compressor 1 will be described.

In the horizontal electric compressor 1, the refrigerant discharged from the two discharge ports 7 is branched into nine refrigerant introduction passages 19 by the refrigerant circulation passage 11, distributed to the same number of stators 17, and given to each stator 17. In addition to preventing the bias of the refrigerant, the dedicated refrigerant introduction paths 19 are arranged in the nine stators, respectively, and further, the respective refrigerant introduction paths 19 are arranged so as to face the respective stators 17, thereby fixing the nine fixed parts. Each of the children is uniformly and sufficiently cooled.

Therefore, even under a condition where a large load is applied to the horizontal electric compressor 1, the temperature rise of the stator 17 and the performance deterioration of the electric motor 5 are prevented, and the performance of the compressor 3 is maintained high.

  In addition, according to the configuration of the present invention in which the refrigerant introduction paths are provided more than the number of discharge ports, the refrigerant introduction paths arranged below the electric motor in the gravitational direction inevitably increase, and therefore stayed in the lower part of the electric motor. Oil (dead oil) is effectively wound up by the flow of refrigerant and circulates again, increasing the lubrication and cooling effect, reducing the amount of oil enclosed in the electric compressor, and reducing costs be able to.

[Other Embodiments Included within the Scope of the Present Invention]
It should be noted that the present invention is not limited to the above-described embodiment, and various modifications can be made within the technical scope of the present invention.

  The compressor is not limited to the vane type compressor, and may be another type of compressor. In any case, it is only necessary to provide more refrigerant introduction paths than the discharge ports.

  For example, the above embodiment is an example in which nine (three or more) refrigerant introduction passages 19 are provided in the vane type compressor 3 having two discharge ports 7, but the vane type compressor has three discharge ports. Some have an outlet. In this case, four or more refrigerant introduction paths are provided. In a scroll type compressor having one discharge port, two or more refrigerant introduction paths are provided.

  Further, in the above-described embodiment, for the electric compressor in which the refrigerant is introduced from the refrigerant suction path 43 through the discharge port 7 into the storage chamber 13 and discharged from the discharge port 57, the discharge port 7, the refrigerant introduction / discharge passage as a circulation port. However, the present invention is also applicable to the electric compressor in which the refrigerant is introduced into the storage chamber 13 of the electric motor 5 from the discharge port 57, discharged from the discharge port 7, and discharged from the refrigerant suction path 43. Can be applied.

< Reference example >
A horizontal electric compressor 101 of a reference example will be described with reference to FIGS. 9 is a longitudinal sectional view of the horizontal electric compressor 101, FIG. 10 is a perspective view of the rear block 103 of the compressor 102, FIG. 11 is a sectional view taken along line BB of FIG. 9, and FIG. FIG. 13 is a perspective view of the electric motor 104. In addition, about the same component as said 1st embodiment, the same code | symbol is attached | subjected and the overlapping description is abbreviate | omitted.

Further, in this reference example , the refrigerant introduction / discharge path 19 is formed by a long hole 106 continuous along the circumferential direction, and the refrigerant introduction / discharge path 19 is formed from two arc-shaped long holes 106 provided along the circumferential direction. Thus, the width of the refrigerant introduction / discharge path 19 is smaller than the diameter of the circulation port 7 of the compressor 3, and a part thereof is located within the diameter of the circulation port 7.

The horizontal electric compressor 101 includes a compressor 102 that compresses a refrigerant and an electric motor 104 that drives the compressor 102, and a refrigerant circulation passage 107 through which the refrigerant flowing through the flow port 7 of the compressor 102 flows in or out. The refrigerant introduction / discharge passage 19 through which the refrigerant is introduced into or discharged from the stator 110 side of the electric motor 104 is formed in the partition wall 109 between the storage chamber 108 of the electric motor 104 and the refrigerant circulation passage 107. The opening of the refrigerant introduction / discharge passage 19 is formed by a long hole 106 continuous along the circumferential direction of the storage chamber 108 of the electric motor 104.

  Two circulation ports 7 are provided in the rear block 103 at equal intervals in the circumferential direction. As shown in FIGS. 11 and 12, the partition wall 109 is formed in the middle housing 111, and the refrigerant introduction / discharge passage 19 is formed in the partition wall 109. Are provided in the circumferential direction, and the refrigerant introduction / discharge passages 19 are arranged to face the respective stators 110. The refrigerant circulation passage 107 is formed between the rear block 103 and the middle housing 111 (partition wall 109) as shown in FIGS. 9 to 11. The two circulation ports 7 and the refrigerant introduction / discharge passage 19 are formed. Communicate with each other.

  The rotation of the electric motor 104 is transmitted from the motor shaft 112 to the rotor shaft 113 (rotor 114) to drive the compressor 102. The compressor 102 discharges the compressed refrigerant to the circulation port 7, and the discharged refrigerant is circulated in the refrigerant. It flows into the path 107. The refrigerant flowing into the refrigerant circulation passage 107 is distributed to the refrigerant introduction / discharge passage 19 of the long hole 106 as shown in FIG. 11 and FIG. 12, and nine pieces facing each from the refrigerant introduction / discharge passage 19 as shown in FIG. These are blown toward the stator 110 to cool them.

  Below the middle housing 111 and the rear housing 115, there is provided an oil reservoir 118 for supplying oil to a portion requiring lubrication, such as a support portion of the rotor shaft 113 and bearings 116, 117, and lubricating and cooling. This oil is accumulated in the lower part of the storage chamber 108 of the electric motor 104, and the refrigerant flowing into the storage chamber 108 from the refrigerant introduction / discharge path 19 cools the stator 110 and then separates the oil with an oil separator. It is discharged from the flow port 7 of the rear housing 115 and sent to the capacitor side.

In this reference example , the refrigerant introduction / discharge path 19 formed in the partition wall 109 is a continuous long hole 106, but it may be blown toward the stator 110. For example, only the lower side in the horizontal direction is long. The hole 106 may be provided and the upper side may be configured as a hole.

  By setting it as the above structures, the effect similar to 1st embodiment can be acquired.

1 is a longitudinal sectional view of a horizontal electric compressor 1. 3 is a perspective view of a rear block 33 that constitutes the compressor 3. FIG. It is AA sectional drawing of FIG. 3 is a perspective view of the compressor 3. FIG. 2 is a perspective view of an electric motor 5. FIG. It is a longitudinal cross-sectional view of a prior art example. It is a perspective view of the compressor 203 which comprises a prior art example. It is a perspective view of the electric motor 205 which comprises a prior art example. It is a longitudinal cross-sectional view of the horizontal electric compressor 101 of a reference example . It is a perspective view of the rear block 103 which comprises the compressor 102 of a reference example . It is BB sectional drawing of FIG. 2 is a perspective view of a compressor 102. FIG. 2 is a perspective view of an electric motor 104. FIG.

Explanation of symbols

1 horizontal electric compressor 3 compressor 5 electric motor 7 discharge port (distribution port)
9 Refrigerant 11 Refrigerant circuit 13 Storage chamber 15 of electric motor 5 Partition wall 17 Stator 19 of electric motor 5 Refrigerant introduction path (refrigerant discharge path)

Claims (2)

An electric motor having a compressor (3) for compressing refrigerant and a stator (17) configured by individually winding a coil (49) around a ferromagnetic core that drives the compressor (3) 5) and housings (23, 25, 27) fixed to each other with bolts ,
The compressor (3) coolant circumfluence path flow refrigerant is you inflows the flow opening (7) of the (11) is provided,
In the partition wall (15) between the storage chamber (13) of the electric motor (5) and the refrigerant circulation passage (11),
The refrigerant is introduced into the stator (17) side of the electric motor (5), the refrigerant introduction discharge passage provided in the housing (25) formed in the partition wall (15) to (19), said An opening of the refrigerant introduction / discharge passage (19) is formed along the circumferential direction of the storage chamber (13) ,
The refrigerant introduction / discharge passage (19) includes a plurality of circular holes (105), and the circular holes (105) are provided more than the number of the circulation ports (7),
The horizontal electric compressor (1), wherein the same number of the refrigerant introduction / discharge passages (19) as the coils (49) of the stator (17) are provided. A horizontal electric compressor (1) according to claim 1,
The horizontal electric compressor (1), wherein the refrigerant introduction / discharge passage (19) is disposed to face the stator (17).

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