JP2019111925A - Cooling system of vehicle rotary electric machine - Google Patents

Abstract

To provide a cooling system which can cool a vehicle rotary electric machine efficiently.SOLUTION: A cooling system 10 includes a refrigeration cycle device 100 for air conditioning and a rotary electric machine cooling mechanism 200. The refrigeration cycle device 100 for air conditioning includes: a compressor 110; a radiator 120; a first expansion valve 130; a first evaporator 140; and a branch passage 160 which connects an upstream side passage 151 provided between the radiator 120 and the first expansion valve 130 to a downstream side passage 152 provided between the first evaporator 140 and the compressor 110. The rotary electric machine cooling mechanism 200 is provided at the branch passage 160 and has a second expansion valve 210 and a second evaporator 220 from the upstream side in a written order, and the second evaporator 220 is disposed in the vehicle rotary electric machine 1.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a cooling system of a rotating electric machine for a vehicle.

  Conventionally, in order to increase the cooling efficiency of a motor mounted on a HEV (Hybrid Electric Vehicle) or an EV (Electric Vehicle), a technology for cooling cooling water or oil for motor cooling using a refrigeration cycle for in-vehicle air conditioning Are known (see Patent Document 1 and Patent Document 2).

JP, 2011-240777, A JP 2004-357458 A

  However, in patent document 1, since heat exchange is performed between the motor coolant and the refrigerant of the refrigeration cycle, there is a problem that the loss is large. Further, in the prior art of Patent Document 2, since the motor cooling oil is cooled using the high pressure side liquefied refrigerant of the refrigeration cycle, the motor can not be efficiently cooled utilizing the latent heat of vaporization on the low pressure side. There's a problem.

  The present invention provides a cooling system capable of efficiently cooling a vehicular rotating electrical machine.

The present invention
A refrigeration cycle apparatus for air conditioning comprising: a compressor for compressing a refrigerant; a radiator for condensing the compressed refrigerant; a first expansion valve for expanding the condensed refrigerant; and a first evaporator for evaporating the expanded refrigerant ,
And a cooling system for a rotating electric machine for a vehicle, comprising:
The air conditioning refrigeration cycle apparatus includes an upstream flow passage provided between the radiator and the first expansion valve, and a downstream flow passage provided between the first evaporator and the compressor. Has a branch channel to connect,
The rotating electrical machine cooling mechanism has a second expansion valve and a second evaporator in order from the upstream side,
The rotating electrical machine cooling mechanism is provided in the branch flow path,
The second evaporator is disposed in the vehicle rotary electric machine.

  According to the present invention, since the rotating electrical machine cooling mechanism is disposed in the branch flow path branched from the air conditioning refrigeration cycle device, the air conditioning refrigeration cycle device can be used to cool the vehicular rotating electrical machine. Further, since the second evaporator for cooling the vehicular rotating electrical machine is provided on the downstream side of the second expansion valve, it is possible to efficiently cool the vehicular rotating electrical machine using the low pressure side vaporized refrigerant.

It is a block diagram of the cooling system of the rotating electrical machine for vehicles of 1st Embodiment. It is a front view of the 2nd evaporator with which the cooling system shown in FIG. 1 is provided. It is a perspective view of a 2nd evaporator shown in FIG. It is sectional drawing which shows typically the heat exchange which arises between the refrigerant | coolant which flows through the inside of the 2nd evaporator shown to FIG.2 and FIG.3, and a coil end. It is a flowchart which illustrates the operation | movement content of the cooling system shown in FIG. It is a front view of the 2nd evaporator with which the cooling system of the rotation electrical machinery for vehicles of a 2nd embodiment is provided. It is a front view which shows the direction of the flow of the refrigerant in the 2nd evaporator with which the cooling system of rotation electrical machinery for vehicles of a 3rd embodiment is provided.

  BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of a cooling system for a vehicle electric rotating machine (hereinafter simply referred to as "cooling system") of the present invention will be described based on the attached drawings.

First Embodiment
First, a cooling system according to a first embodiment of the present invention will be described with reference to FIGS.

[Constitution]
First, the configuration of the cooling system according to the present embodiment will be described.
As shown in FIG. 1, a cooling system 10 according to the present embodiment includes a refrigeration cycle apparatus 100 for air conditioning, and a rotating electrical machine cooling mechanism 200 for cooling a rotating electrical machine 1 for a vehicle.

  The refrigeration cycle apparatus 100 for air conditioning is expanded by a compressor 110 for compressing the refrigerant R, a radiator 120 for condensing the compressed refrigerant R, a first expansion valve 130 for expanding the refrigerant R, and a first expansion valve 130 And a first evaporator 140 for evaporating the refrigerant R. A receiver 150 for separating the refrigerant R from the radiator 120 into gas and liquid is provided immediately downstream of the radiator 120, and the liquefied refrigerant LR is supplied from the receiver 150 to the first expansion valve 130. Further, the first expansion valve 130 includes a heat sensitive cylinder 131 that senses the refrigerant temperature on the refrigerant outlet side of the first evaporator 140, and the opening degree is automatically adjusted in accordance with the sensed temperature of the heat sensitive cylinder 131.

  The air conditioning refrigeration cycle apparatus 100 includes an upstream flow passage 151 provided between the radiator 120 and the first expansion valve 130, and a downstream flow passage 152 provided between the first evaporator 140 and the compressor 110. , And a branched flow passage 160 connecting the two.

  The rotating electrical machine cooling mechanism 200 is provided in the branch flow path 160. The rotating electrical machine cooling mechanism 200 has a second expansion valve 210 and a second evaporator 220 in this order from the upstream side, and the second evaporator 220 is disposed in the automotive rotating electrical machine 1. That is, a second evaporator 220 as a heat exchange unit that exchanges heat with the vehicular rotating electrical machine 1 is disposed downstream of the second expansion valve 210. The second expansion valve 210 expands the refrigerant R. The second evaporator 220 evaporates the refrigerant R expanded by the second expansion valve 210 by the heat of the automotive rotary electric machine 1. The rotary electric machine 1 for vehicles is cooled by the vaporization heat. The liquefied refrigerant LR is supplied to the second expansion valve 210 from the receiver 150. The second expansion valve 210 includes a thermal cylinder 211 that senses the temperature of the refrigerant on the refrigerant outlet side of the second evaporator 220, and the degree of opening is automatically adjusted in accordance with the sensed temperature of the thermal cylinder 211.

  A first on-off valve 171 capable of blocking the flow of the refrigerant R is provided between the first expansion valve 130 and the branch portion 151 a between the upstream flow passage 151 and the branch flow passage 160. A second on-off valve 172 capable of blocking the flow of the refrigerant R is provided between the branch portion 151 a and the second expansion valve 210. A third on-off valve 173 capable of blocking the flow of the refrigerant R is provided between the second evaporator 220 and the junction 152 a of the downstream flow passage 152 and the branch flow passage 160. A fourth on-off valve 174 capable of blocking the flow of the refrigerant R is provided between the first evaporator 140 and the merging portion 152a. The first to fourth on-off valves 171 to 174 are opened and closed by solenoids 181 to 184, respectively. The solenoids 181 to 184 are controlled by a control device (not shown). The refrigerant R may be selectively flowed to the first evaporator 140 of the air conditioning refrigeration cycle apparatus 100 and the second evaporator 220 of the rotary electric machine cooling mechanism 200 by controlling the opening and closing of the first to fourth on-off valves 171 to 174. it can.

  As shown in FIGS. 2 and 3, the automotive rotating electrical machine 1 includes a rotor 3 and a stator 7 around which a coil 5 is wound. The second evaporator 220 is disposed to face the coil end 9 protruding from one end side of the stator 7. The second evaporator 220 is configured of two arc-shaped evaporators 221 and 222. The two evaporators 221 and 222 are connected in parallel between the second on-off valve 172 and the third on-off valve 173, and are disposed so as to surround the coil end 9 from the outer peripheral side. The coil end 9 is biased by the The evaporators 221 and 222 may be in tactile contact with the coil end 9 or may be in indirect contact with members having high thermal conductivity.

  As described above, by arranging the second evaporator 220 so as to face the coil end 9, the heat generation of the coil 5 is suppressed by the refrigerant R flowing in the second evaporator 220, and the vehicle electric rotating machine 1 can be made efficient. Can be cooled. That is, as shown in FIG. 4, the heat H from the coil end 9 is absorbed by the liquefied refrigerant LR in the second evaporator 220 flowing opposite to the coil end 9 and carried away as the vaporized refrigerant GR. The end 9 can be cooled effectively. Further, since the two arc-shaped evaporators 221 and 222 are connected in parallel, the temperature difference between the upstream side and the downstream side of the evaporators 221 and 222 can be reduced, and the coil end 9 can be cooled more effectively. In addition, since the two arc-shaped evaporators 221 and 222 are arranged to surround the coil end 9 from the outer peripheral side, the coil end 9 can be cooled as a whole. Furthermore, since the two arc-shaped evaporators 221 and 222 are biased to the coil end 9 by the fastening member 230 so as to sandwich the coil end 9, the evaporators 221 and 222 directly and indirectly contact the coil end 9. The coil end 9 can be cooled more effectively.

  In the present embodiment, the second evaporator 220 is disposed to face only the coil end 9 protruding from one end side of the stator 7, but the coil end 9 projecting the second evaporator 220 from the other end side of the stator 7. You may arrange so that it may also oppose. Further, the second evaporator 220 may be disposed on the inner circumferential side of the coil end 9 or may be disposed to face the coil end 9 in the axial direction of the automotive rotary electric machine 1.

[Operation]
Next, the operation of the cooling system 10 configured as described above will be described with reference to FIG. The control which consists of the following series of steps S1-S10 is made by the control device which is not illustrated.

  In step S1, it is monitored whether the temperature (hereinafter referred to as "coil temperature") Tm of the coil 5 of the automotive rotary electric machine 1 has reached a predetermined temperature (hereinafter referred to as "cooling start temperature") Th. If the coil temperature Tm has reached the cooling start temperature Th (Yes in S1), the process proceeds to step S2. If the coil temperature Tm has not reached the cooling start temperature Th (No in S1), the process proceeds to step S3.

  In step S2, the second on-off valve 172 and the third on-off valve 173 are opened, and the process proceeds to step S4. By opening the second on-off valve 172 and the third on-off valve 173, the refrigerant R flows into the second evaporator 220 of the rotary electric machine cooling mechanism 200.

  In step S3, the second on-off valve 172 and the third on-off valve 173 are closed, and the process proceeds to step S4. By closing the second on-off valve 172 and the third on-off valve 173, the refrigerant R does not flow to the second evaporator 220 of the rotary electric machine cooling mechanism 200.

  In step S4, it is determined whether there is an air conditioning request. If there is an air conditioning request (Yes in S4), the process proceeds to step 5. If there is no air conditioning request (No in S4), the process proceeds to step 6.

  In step S5, the first on-off valve 171 and the fourth on-off valve 174 are opened, and the process proceeds to step S7. By opening the first on-off valve 171 and the fourth on-off valve 174, the refrigerant R flows into the first evaporator 140 of the air conditioning refrigeration cycle apparatus 100.

  In step S6, the first on-off valve 171 and the fourth on-off valve 174 are closed, and the process proceeds to step S7. By closing the first on-off valve 171 and the fourth on-off valve 174, the refrigerant R does not flow to the first evaporator 140 of the air conditioning refrigeration cycle apparatus 100.

  In step S7, the necessary refrigerant flow rate is determined in accordance with the operating state of the cooling system 10. That is, in the operating state (S1: Yes, S4: Yes) in which the air conditioning refrigeration cycle apparatus 100 and the rotating electrical machine cooling mechanism 200 are operated simultaneously (S1: Yes, S4: Yes) The flow rate is determined. Further, in the operating state (S1: No, S4: Yes) in which only the air conditioning refrigeration cycle apparatus 100 is operated, the flow rate of refrigerant necessary for the operation of the air conditioning refrigeration cycle apparatus 100 is determined. Further, in the operating state (S1: Yes, S4: No) in which only the rotary electric machine cooling mechanism 200 is operated, the flow rate of the refrigerant necessary for operating the rotary electric machine cooling mechanism 200 is determined. Thereafter, the process proceeds to step S8, and the compressor 110 is driven. Air conditioning by the air conditioning refrigeration cycle apparatus 100 and cooling of the automotive rotary electric machine 1 by the rotary electric machine cooling mechanism 200 are selectively performed by circulating the refrigerant R in the flow path according to the driving state by driving the compressor 110.

  As described above, according to the present embodiment, when the coil temperature Tm of the automotive rotary electric machine 1 reaches the cooling start temperature Th, cooling of the automotive rotary electric machine 1 by the rotary electric machine cooling mechanism 200 is performed. Since the rotating electrical machine cooling mechanism 200 is disposed in the branch flow passage 160 branched from the air conditioning refrigeration cycle apparatus 100, the air conditioning refrigeration cycle apparatus 100 can be used to cool the vehicular rotating electrical machine 1. Moreover, since the 2nd evaporator 220 which cools the rotary electric machine 1 for vehicles is provided in the downstream of 210 of a 2nd expansion valve, the rotary electric machine 1 for vehicles can be cooled efficiently.

Second Embodiment
Next, a second embodiment of the cooling system of the present invention will be described. As shown in FIG. 6, in the second embodiment, the second evaporator 220 is configured by three arc-shaped evaporators 241 to 243. These three evaporators 241 to 243 are connected in parallel between the second on-off valve 172 and the third on-off valve 173, arranged so as to surround the coil end 9 from the outer peripheral side, and fastened so as to sandwich from three sides The coil end 9 is biased by the member 230. The other configuration is the same as that of the first embodiment. According to this embodiment, the temperature distribution of the coil end 9 can be made more uniform and cooled efficiently.

Third Embodiment
Next, a third embodiment of the cooling system of the present invention will be described. As shown in FIG. 7, in the third embodiment, the refrigerant R is caused to flow to the two evaporators 221 and 222 constituting the second evaporator 220 so that the flow directions are opposite to each other. The other configuration is the same as that of the first embodiment. According to this embodiment, since the temperature gradient generated between the upstream side and the downstream side of the refrigerant R is offset, the temperature distribution of the coil end 9 can be made more uniform and cooled efficiently.

  In the embodiment described above, modifications, improvements, and the like can be made as appropriate. For example, in the first embodiment, the process (S1) of determining whether the coil temperature Tm has reached the cooling start temperature Th and the process of opening or closing the second on-off valve 172 and the third on-off valve 173 After (S2, S3), a process (S4) for determining the presence or absence of the air conditioning request and a process (S5, S6) for opening or closing the first on-off valve 171 and the fourth on-off valve 174 are performed. However, the order of the former process (S1, S2, S3) and the latter process (S4, S5, S6) may be reversed.

  In the above embodiment, although the air conditioning refrigeration cycle apparatus 100 and the rotary electric machine cooling mechanism 200 can be controlled independently by the first to fourth on-off valves 171 to 174, the air conditioning refrigeration cycle apparatus 100 and the rotary electric machine cooling mechanism 200 And the first on-off valve 171, the first expansion valve 130, the first evaporator 140, the fourth on-off valve 174, and the flow path provided with them from the cooling system 10 shown in FIG. It can be omitted. In this case, the second evaporator 220 functions as a heat exchange unit of the vehicular electric rotating machine 1 and also functions as a heat exchange unit of the air conditioning refrigeration cycle apparatus 100.

  At least the following matters are described in the present specification. In addition, although the corresponding component etc. are shown in above-described embodiment in parenthesis, it is not limited to this.

(1) A compressor (compressor 110) for compressing the refrigerant (refrigerant R), a radiator (radiator 120) for condensing the compressed refrigerant, and a first expansion valve (first expansion valve 130) for expanding the condensed refrigerant And a first evaporator (first evaporator 140) for evaporating the expanded refrigerant, and an air conditioning refrigeration cycle apparatus (air conditioning refrigeration cycle apparatus 100),
A cooling system (cooling system 10) for a vehicular rotating electrical machine, comprising: a rotating electrical machine cooling mechanism (a rotating electrical machine cooling mechanism 200) for cooling a vehicular rotating electrical machine (vehicle electrical rotating machine 1);
The air conditioning refrigeration cycle apparatus is provided between an upstream flow passage (upstream flow passage 151) provided between the radiator and the first expansion valve, and between the first evaporator and the compressor. A branch channel (branch channel 160) connecting the downstream channel (downstream channel 152),
The rotating electrical machine cooling mechanism has a second expansion valve (second expansion valve 210) and a second evaporator (second evaporator 220) in order from the upstream side,
The rotating electrical machine cooling mechanism is provided in the branch flow path,
A cooling system for a vehicular rotary electric machine, wherein the second evaporator is disposed in the vehicular rotary electric machine.

  According to (1), since the rotating electrical machine cooling mechanism is disposed in the branch flow channel branched from the air conditioning refrigeration cycle device, it is possible to cool the vehicular rotating electrical machine using the air conditioning refrigeration cycle device. Further, since the second evaporator for cooling the vehicular rotating electrical machine is provided on the downstream side of the second expansion valve, it is possible to efficiently cool the vehicular rotating electrical machine using the low pressure side vaporized refrigerant.

(2) A cooling system for a vehicular electric rotating machine according to (1), which
A first on-off valve (first on-off valve 171) capable of blocking the flow of the refrigerant is provided between a branch portion between the upstream flow passage and the branch flow passage and the first expansion valve;
A second on-off valve (second on-off valve 172) capable of blocking the flow of the refrigerant is provided between the branch portion and the second expansion valve;
A third on-off valve (third on-off valve 173) capable of blocking the flow of the refrigerant is provided between the second evaporator and the junction of the downstream flow passage and the branch flow passage,
A cooling system of a vehicular rotating electrical machine, wherein a fourth on-off valve (a fourth on-off valve 174) capable of blocking the flow of a refrigerant is provided between the first evaporator and the merging portion.

  According to (2), the refrigerant can be selectively flowed to the first evaporator for air conditioning and the second evaporator of the rotary electric machine cooling mechanism by controlling the first to fourth on-off valves as needed. Cooling of the vehicular rotating electric machine can be efficiently cooled.

(3) It is a cooling system of the electric rotating machine for vehicles given in (1),
The vehicular electric rotating machine includes a rotor (rotor 3) and a stator (stator 7) on which a coil (coil 5) is wound.
The cooling system for the automotive rotary electric machine, wherein the second evaporator is disposed to face a coil end (coil end 9) protruding from one end side of the stator.

  According to (3), since the second evaporator is disposed to face the coil end, the heat generation of the coil can be suppressed.

(4) A cooling system for a vehicle electric rotating machine according to (3), wherein
The second evaporator is constituted by at least two arc-shaped evaporators (221, 222),
The cooling system for a vehicular rotating electrical machine, wherein the at least two arc-shaped evaporators are connected in parallel.

  According to (4), since at least two arc-shaped evaporators are connected in parallel, the temperature difference between the upstream side and the downstream side of the evaporator can be reduced, and the coil end can be cooled more effectively.

(5) A cooling system for a vehicle electric rotating machine according to (3) or (4), wherein
The second evaporator comprises two arc-shaped evaporators,
The cooling system for the automotive rotary electric machine, wherein the two arc-shaped evaporators are disposed so as to surround the coil end from the outer peripheral side.

  According to (5), since the two arc-shaped evaporators are disposed to surround the coil end from the outer peripheral side, it is possible to cool the coil end as a whole.

(6) A cooling system for a vehicle electric rotating machine according to (5), wherein
The cooling system for the automotive rotary electric machine, wherein the two arc-shaped evaporators are biased toward the coil end by a fastening member (fastening member 230) so as to sandwich the coil end.

  According to (6), since the two arc-shaped evaporators are biased to the coil end by the fastening member so as to sandwich the coil end, the coil is brought into contact with the coil end directly or indirectly. The end can be cooled more effectively.

(7) A cooling system (cooling system 10) for a rotating electric machine for a vehicle
A compressor (compressor 110) for compressing a refrigerant;
A radiator (radiator 120) for condensing the compressed refrigerant; and an expansion valve (second expansion valve 210) for expanding the condensed refrigerant.
An evaporator (second evaporator 220) for evaporating the expanded refrigerant.
A cooling system for a vehicular rotary electric machine, wherein a heat exchange unit (second evaporator 220) which exchanges heat with the vehicular rotary electric machine is provided downstream of the expansion valve.

  According to (7), since the heat exchange unit that exchanges heat with the vehicular rotating electric machine is provided on the downstream side of the expansion valve, the low-pressure side liquefied refrigerant or the low-pressure side vaporized refrigerant is used efficiently for the vehicular rotating electric machine Can be cooled.

(8) A cooling system for a vehicle electric rotating machine according to (7), which
The cooling system for a vehicular rotating electrical machine, wherein the heat exchange unit is the evaporator.

  According to (8), by using the heat exchange unit as an evaporator, the vehicle electric rotating machine can be cooled most efficiently.

Reference Signs List 1 rotating electric machine 3 for vehicle 3 rotor 5 coil 7 stator 9 coil end 10 cooling system 100 refrigeration cycle apparatus for air conditioning 110 compressor 120 radiator 130 first expansion valve 140 first evaporator 151 upstream flow path 152 downstream flow path 160 branch flow path 171 first on-off valve 172 second on-off valve 173 third on-off valve 174 fourth on-off valve 200 rotating electrical machine cooling mechanism 210 second expansion valve 220 second evaporator (heat exchange section)
221, 222 Evaporator 241-243 Evaporator 230 Fastening member GR Evaporated refrigerant LR Liquefied refrigerant R Refrigerant

Claims (8)

A refrigeration cycle apparatus for air conditioning comprising: a compressor for compressing a refrigerant; a radiator for condensing the compressed refrigerant; a first expansion valve for expanding the condensed refrigerant; and a first evaporator for evaporating the expanded refrigerant ,
And a cooling system for a rotating electric machine for a vehicle, comprising:
The air conditioning refrigeration cycle apparatus includes an upstream flow passage provided between the radiator and the first expansion valve, and a downstream flow passage provided between the first evaporator and the compressor. Has a branch channel to connect,
The rotating electrical machine cooling mechanism has a second expansion valve and a second evaporator in order from the upstream side,
The rotating electrical machine cooling mechanism is provided in the branch flow path,
A cooling system for a vehicular rotary electric machine, wherein the second evaporator is disposed in the vehicular rotary electric machine. It is a cooling system of the electric rotating machine for vehicles according to claim 1,
A first on-off valve capable of blocking the flow of the refrigerant is provided between a branch portion between the upstream flow passage and the branch flow passage and the first expansion valve,
A second on-off valve capable of blocking the flow of the refrigerant is provided between the branch portion and the second expansion valve;
A third on-off valve capable of blocking the flow of the refrigerant is provided between the second evaporator and a junction of the downstream flow passage and the branch flow passage,
A cooling system for a vehicular rotating electrical machine, comprising: a fourth on-off valve capable of blocking a flow of a refrigerant between the first evaporator and the merging portion. It is a cooling system of the electric rotating machine for vehicles according to claim 1,
The vehicular electric rotating machine includes a rotor and a stator on which a coil is wound.
The cooling system for a vehicular rotary electric machine, wherein the second evaporator is disposed to face a coil end projecting from one end side of the stator. It is a cooling system of the rotary electric machine for vehicles according to claim 3,
The second evaporator is constituted by at least two arc-shaped evaporators,
The cooling system for a vehicular rotating electrical machine, wherein the at least two arc-shaped evaporators are connected in parallel. It is a cooling system of the electric rotating machine for vehicles according to claim 3 or 4,
The second evaporator comprises two arc-shaped evaporators,
The cooling system for the automotive rotary electric machine, wherein the two arc-shaped evaporators are disposed so as to surround the coil end from the outer peripheral side. A cooling system for a vehicular rotating electrical machine according to claim 5, wherein
The cooling system for the automotive rotary electric machine, wherein the two arc-shaped evaporators are biased toward the coil end by a fastening member so as to sandwich the coil end. A cooling system of a rotating electric machine for a vehicle,
A compressor for compressing the refrigerant,
A radiator for condensing the compressed refrigerant and an expansion valve for expanding the condensed refrigerant;
And an evaporator for evaporating the expanded refrigerant.
A cooling system for a rotating electrical machine for a vehicle, further comprising a heat exchange unit that exchanges heat with the rotating electrical machine for a vehicle, downstream of the expansion valve. It is a cooling system of the electric rotating machine for vehicles according to claim 7,
The cooling system for a vehicular rotating electrical machine, wherein the heat exchange unit is the evaporator.

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