JP2004082921A - Piping with cooling medium inlet and cooling system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To shorten the filling time of cooling water with a simple structural change. <P>SOLUTION: Piping with with inlet 100 is connected to an inlet 110 in which cooling water is filled from upward and a tank part 104 connected to a lower part of the inlet 110 and having a predetermined space, and includes a horizontal pipe 106 extending in a roughly horizontal direction and a downward pipe 108 connected to the tank part 104 and extending obliquely downward. The horizontal pipe 106 is connected to a radiator and the downward pipe 108 is connected to PCU. Section area of the horizontal pipe 106 is larger than section area of the downward pipe 108. Section area of the inlet 110 is smaller than the sum of the section area of the horizontal pipe 106 and the section area of the downward pipe 108. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a cooling device mounted on a vehicle, and more particularly, to a piping with a cooling water inlet and a cooling system.
[0002]
[Prior art]
2. Description of the Related Art As a driving source for traveling, a hybrid vehicle including an engine and an electric motor powered by a battery is known. As one of such hybrid vehicles, from the viewpoint of preventing global warming and conserving resources, when a vehicle stops at an intersection at a red light, the driver automatically stops the engine and starts driving again. When the engine is operated (for example, depressing the accelerator pedal or brake pedal, or shifting the shift lever to the drive position), the economy running system (idling stop system, engine automatic stop and start system) restarts the engine. Has been developed mainly for large vehicles such as buses, and some of them have been put to practical use.
[0003]
In this system, in addition to a secondary battery such as a normal 12V lead storage battery, a 36V lead battery is used to supply power to auxiliary equipment (air conditioners, headlamps, audio, etc.) when the vehicle is stopped. A secondary battery such as a storage battery or a lithium battery is mounted. While the vehicle is stopped, power is supplied to these accessories from the 36 V secondary battery.
[0004]
Also, using the electric power of the 36 V secondary battery, the motor generator is rotated to restart the engine. Further, during the operation of the engine, the 36V battery and the 12V battery are charged using the motor generator.
[0005]
Therefore, in such a vehicle, two power supplies (36 V battery and 12 V battery) having different voltages and a PCU (Power Control Unit) including an inverter and a converter are mounted. The PCU is connected to these two power supplies by a power cable, and is also connected to a motor generator provided on a side of the engine.
[0006]
Further, the PCU is cooled by cooling water in order to suppress a rise in temperature due to an internal electric circuit. The cooling water of the PCU is heat-exchanged with outside air by an electric water pump and a radiator of a different system from the cooling water of the engine. The electric water pump circulates cooling water between the PCU and a radiator of a different system from the engine cooling water provided on the side of the radiator of the engine cooling water.
[0007]
As described above, the PCU is connected to the plurality of power cables, the input pipe and the output pipe of the cooling water.
[0008]
Referring to FIG. 8, a cooling system for the PCU will be described. As shown in FIG. 8, the PCU 1200 has a cooling water inlet 1202 connected to a hose 1504 connected to an electric water pump 1400, and a cooling water outlet 1204 connected to a hose 1502 connected to a reservoir tank 1100 with an inlet. Are connected. The hose 1504 is provided with an air vent plug 1210. The electric water pump 1400 is connected to the lower tank pipe 1314 of the radiator 1300 via the hose 1506, and sends out the cooling water flowing from the lower tank 1312 to the PCU 1200. The radiator 1300 is of a downflow type. The electric water pump 1400 sends cooling water from the reservoir tank with inlet 1100 to the upper tank 1302 via the hose 1500 and the upper tank pipe 1304 of the radiator 1300.
[0009]
When injecting LLC (Long Life Coolant) as cooling water in the cooling system having such a configuration, the cap of the reservoir tank 1100 with an inlet is opened and the LLC is poured. LLC is filled through the hose 1500 and the hose 1502. Finally, when filling the upper part of the hose 1504 with the LLC, the air bleeding plug 1210 is opened, the level of the LLC in the hose 1504 is raised, and a sufficient amount of the LLC is filled.
[0010]
[Problems to be solved by the invention]
However, when LLC is injected into a conventional cooling system, there are the following problems. The injected LLC mainly flows by gravity through the hose 1502 and into the PCU 1200 located below. LLC blocks hose 1502.
[0011]
On the other hand, although the space between the upper tank 1302 of the radiator 1300 and the reservoir tank 1100 with the inlet is almost horizontal, some LLC flows into the hose 1500 on this side. Since the hose 1500 has a small diameter and is almost horizontal, exchange of air and water (water-water exchange) does not work, and the hose 1500 is closed by LLC.
[0012]
For this reason, since both ends of the closed path for circulating the cooling water are closed with the LLC, it takes a long time to fill the LLC or a sufficient amount of the LLC cannot be filled.
[0013]
SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problem, and it is possible to shorten an LLC filling time and to inject a sufficient amount of LLC into a cooling system closed path by a simple structure change. It is to provide a piping with a refrigerant inlet and a cooling system.
[0014]
[Means for Solving the Problems]
A pipe according to a first aspect of the present invention is a pipe with a refrigerant inlet incorporated in a cooling system for cooling a power converter that supplies power to a motor mounted on a vehicle. The pipe with an inlet for the refrigerant is an inlet for injecting the refrigerant from above, a gap connected below the inlet, having a predetermined space, and a pipe extending in the substantially horizontal direction connected to the gap. One conduit and a second conduit connected to the gap and extending downward. The cross-sectional area of the first conduit is greater than the cross-sectional area of the second conduit, and the cross-sectional area of the inlet is greater than the sum of the cross-sectional area of the first conduit and the cross-sectional area of the second conduit. It is small.
[0015]
According to the first invention, the refrigerant injected from the injection port is temporarily stored in the gap portion, and then, for example, to the radiator through the first pipe extending in a substantially horizontal direction, to the radiator, for example, through the second pipe extending downward. Flow to the power converter. At this time, the cross-sectional area of the first conduit is larger than the cross-sectional area of the second conduit, so that air-water exchange can be easily realized in the first conduit. Further, the cross-sectional area of the inlet is smaller than the sum of the cross-sectional area of the first pipe and the cross-sectional area of the second pipe into which the refrigerant flows. Blocking both the conduit and the second conduit does not occur in principle. As a result, blocking of both the first pipe and the second pipe does not occur in principle, and even if the second pipe extending downward is blocked by the refrigerant, the first pipe is blocked. Since the air-water exchange is performed in the path, it is possible to avoid closing both ends of the closed path constituting the cooling system. Therefore, the charging time of the refrigerant can be shortened, and a sufficient amount of the refrigerant can be injected into the closed path of the cooling system. Further, since air and water are exchanged in the first conduit, an air vent plug is not required, and a refrigerant is temporarily stored in the gap, so that a reserve tank is not required. As a result, it is possible to shorten the charging time of the refrigerant by a simple structure change such as changing the pipe diameter, and to provide a pipe with a refrigerant inlet capable of injecting a sufficient amount of the refrigerant into the closed path of the cooling system. Can be.
[0016]
In the pipe with a refrigerant inlet according to the second invention, in addition to the configuration of the first invention, the second pipe includes a pipe extending downward and inclined.
[0017]
According to the second invention, blocking of both the first conduit and the second conduit does not occur in principle, and if the second inclined conduit connected to the power converter is inclined downward, Even when the first pipeline is closed, air-water exchange can be performed in the first pipeline having a larger sectional area than the second pipeline.
[0018]
The cooling system in which the pipe with the refrigerant inlet according to the third invention is incorporated includes, in addition to the configuration of the first or second invention, a radiator that radiates heat of the refrigerant. The first pipe of the pipe with the refrigerant inlet is connected to the radiator, and the second pipe is connected to the power converter.
[0019]
According to the third aspect, a radiator capable of shortening the charging time of the refrigerant and injecting a sufficient amount of the refrigerant into the closed path of the cooling system by changing the simple structure of changing the cross-sectional area of the pipeline. The piping with the inlet of the refrigerant used for the cooling system containing the can be provided.
[0020]
The radiator in the cooling system into which the pipe with the refrigerant inlet according to the fourth invention is incorporated is a downflow type.
[0021]
According to the fourth aspect of the present invention, a simple structure change such as a change in the cross-sectional area of the pipeline shortens the charging time of the refrigerant and allows a sufficient amount of the refrigerant to be injected into the closed path of the cooling system. It is possible to provide a pipe with a refrigerant inlet used in a cooling system including a mold radiator. At this time, the pipe with the coolant inlet and the coolant inlet of the radiator are substantially horizontal and are connected by the first pipe.
[0022]
A cooling system according to a fifth aspect of the present invention includes the pipe with an inlet according to any one of the first to third aspects.
[0023]
According to the fifth aspect, it is possible to provide a cooling system capable of shortening the charging time of the refrigerant and injecting a sufficient amount of the refrigerant into the closed path of the cooling system.
[0024]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same components are denoted by the same reference numerals. Their names and functions are the same. Therefore, detailed description thereof will not be repeated. In the following, an example in which the pipe with an inlet according to the embodiment of the present invention is applied to a vehicle equipped with an economy running system will be described, but the present invention is limitedly applied to such a vehicle. Not something.
[0025]
FIG. 1 illustrates a system configuration of a vehicle equipped with a PCU according to the present embodiment. This vehicle includes an engine 1002, a torque converter 1004, an automatic transmission 1006, a PCU 200, an engine ECU 1196, a 12V power supply 812 connected to the PCU 200, and a 36V power supply 836. This vehicle also includes a motor generator 1026 connected to engine 1002 via damper pulley 1010, and accessories 1120 connected to engine 1002 via damper pulley 1010.
[0026]
PCU 200 includes an inverter 1102, a DC / DC converter 1104, and a hybrid ECU 1106. Hybrid ECU 1106 implements an economy running system that controls the operation and stop of engine 1002 according to the driving state of the vehicle.
[0027]
In such a configuration, the output of engine 1002 is output to output shaft 1008 via torque converter 1004 and automatic transmission 1006. Finally, the output of engine 1002 is transmitted to driving wheels (not shown). Apart from this, the output of the engine 1002 is transmitted to the belt 1014 via a damper pulley 1010 with a built-in electromagnetic clutch connected to the crankshaft 1002a. The pulley 1016 and the pulley 1018 are rotated by the output transmitted by the belt 1014. Note that the electromagnetic clutch built into the damper pulley 1010 is connected / disconnected as necessary to enable transmission / non-transmission of output between the damper pulley 1010 and the crankshaft 1002a.
[0028]
The rotating shaft of the auxiliary equipment 1020 is connected to the pulley 1016, and the auxiliary equipment 1020 can be driven by the rotational force transmitted from the belt 1014. Examples of the accessories 1020 include a compressor for an air conditioner, a pump for power steering, a water pump for cooling an engine, and the like.
[0029]
The pulley 1018 is connected to a rotating shaft of a motor generator 1026 as a rotating electric machine. Motor generator 1026 functions as a generator as necessary, and converts the torque transmitted from engine 1002 or drive wheels transmitted via pulley 1018 to electric energy. Furthermore, motor generator 1026 rotates one or both of crankshaft 1002a and accessories 1020 via pulley 1018 and belt 1014 by functioning as an electric motor as needed. Motor generator 1026 is a three-phase AC rotating electric machine.
[0030]
PCU 200 includes an inverter 1102, a DC / DC converter 1104, and a hybrid ECU 1106. Inverter 1102 and motor generator 1026 are connected by power lines 1131a, 1131b, and 1311c, and inverter 1102 and high-voltage DC power supply 836 (rated voltage 36V) as a second power supply are connected by power line 1130b. The DC / DC converter 1104, the inverter 1102, and the high-voltage DC power supply 836 are connected by the power line 1130c, and the DC / DC converter 1104 and the low-voltage DC power supply 812 (rated voltage 12V) as the first power supply are connected. , And a power line 1130d. Note that the coating of the power lines 1131a, 1131b, 1131c, 1130b, and 1130c is colored in yellow, and the power line 1130d is colored in black.
[0031]
When the motor generator functions as a generator, inverter 1102 controlled by hybrid ECU 1106 adjusts charging pressure and power generation by switching, so that motor generator 1026 charges high-voltage DC power supply 836 with electric energy. Do. Further, electric energy is also charged to low-voltage DC power supply 1150 via DC / DC converter 1104.
[0032]
When power is not being generated by motor generator 1026, power is supplied from high-voltage DC power supply 836 to low-voltage DC power supply 812 because high-voltage DC power supply 836 and low-voltage DC power supply 812 are connected. Is done.
[0033]
When motor generator 1026 functions as a motor, inverter 1102 controlled by hybrid ECU 1106 supplies electric power from high voltage DC power supply 836 to motor generator 1026.
[0034]
In addition to the control of the inverter 1102, the hybrid ECU 1106 automatically stops the engine 1002 when a predetermined engine automatic stop condition is satisfied, and also controls the engine 1002 when a predetermined engine automatic start condition is satisfied. Automatic start / stop control for automatically starting the engine. At the time of the automatic engine start, hybrid ECU 1106 connects an electromagnetic clutch built in damper pulley 1010 and controls inverter 1102 to supply electric power from high-voltage DC power supply 836 to motor generator 1026 to motor generator 1026 as described above. The generator 1026 is driven to crank the engine 1002. Further, during automatic engine stop, hybrid ECU 1106 disconnects the electromagnetic clutch built in damper pulley 1010 and controls inverter 1102 to supply electric power from high-voltage DC power supply 836 to motor generator 1026 as described above. Then, the motor generator 1026 is driven, and the accessories 1026 are driven.
[0035]
With reference to FIG. 2, on-vehicle arrangement of components of a vehicle on which the PCU according to the present embodiment is mounted will be described. As shown in FIG. 2, PCU 200 is disposed in the engine room 1040 on the vehicle front side of the vehicle. Unit case 1110 of PCU 200 is formed, for example, to a size that can be arranged on a battery tray (not shown) for disposing the 12 V DC power supply in an existing vehicle having only the 12 V DC power supply. The high-voltage DC power supply 836 and the low-voltage DC power supply 812 are mounted on the rear part of the vehicle.
[0036]
As shown in FIG. 2, a cooling system for PCU 200 is mounted in engine room 1040 together with engine radiator 350 and its piping 352 and 354. The piping 100 with an inlet according to the embodiment of the present invention is incorporated in the cooling system of the PCU 200. The cooling system of the PCU 200 includes a pipe 100 with an inlet, a radiator 300 for the PCU 200, an electric water pump 400, a PCU 200 to be cooled, and a hose 500 for connecting these devices and circulating cooling water. , 502, 504, 506.
[0037]
The cooling system of PCU 200 will be described with reference to FIG. 3 and FIG. As described above, the pipe with inlet 100 according to the embodiment of the present invention is incorporated in this cooling system.
[0038]
FIG. 3 is a side view of the cooling system, and FIG. 4 is a perspective view of the cooling system. As shown in FIGS. 3 and 4, the cooling system includes a pipe 100 with an inlet provided at the uppermost position of the cooling system, a radiator 300 for the PCU 200 provided in front of the vehicle, and a lower part of the PCU 200. , An electric water pump 200, a PCU 200 to be cooled, and hoses 500, 502, 504, and 506 for connecting these devices and circulating cooling water.
[0039]
A hose 504 connected to the electric water pump 400 is connected to the cooling water inlet 202 of the PCU 200, and a hose 502 connected to the pipe 100 with the inlet is connected to the cooling water outlet 204. The electric water pump 400 is connected to the lower tank pipe 314 of the radiator 300 via the hose 506, and sends out the cooling water flowing from the lower tank 312 to the PCU 200. The radiator 300 is of a downflow type. The electric water pump 400 sends cooling water from the pipe with inlet 100 to the upper tank 302 via the hose 500 and the upper tank pipe 304 of the radiator 300.
[0040]
The inlet pipe 100 is provided at the highest position in the cooling system. The material of the pipe with inlet 100 is resin (glass fiber reinforced nylon or the like), and a cap 102 is provided similarly to a radiator for an engine.
[0041]
The material of the hoses 500, 502, 504, and 506 is rubber such as EPDM (ethylene-propylene terpolymer).
[0042]
The radiator 300 is of a down-flow type, and the material of the upper tank 302 and the lower tank 304 is the same as that of the pipe 100 with the inlet. An upper tank pipe 304 and a lower tank pipe 314 for connecting a hose are integrally formed with the upper tank 302 and the lower tank 304, respectively. The cross-sectional area of the horizontal pipe 106, the cross-sectional area of the hose 500, and the cross-sectional area of the upper tank pipe 304 are the same.
[0043]
5 and 6 show perspective views of the pipe 100 with the inlet. As shown in FIGS. 5 and 6, the pipe with inlet 100 includes a cap 102 that is opened when cooling water is supplied, an inlet 110, a tank 104 connected below the inlet, and a tank 104. A horizontal pipe 106 extending in the direction of the radiator 300 in the direction of the radiator 300, a downwardly inclined downward pipe 108 extending in the direction of the PCU 200 from the tank section 104, and a fixing stay 120 for supporting the pipe with the inlet. .
[0044]
The horizontal pipe 106 and the hose 500 are tightened by the hose clip 130, and the downward pipe 108 and the hose 502 are tightened by the hose clip 130.
[0045]
As shown in FIGS. 5 and 6, when the diameter of the horizontal pipe 106 is D (1) and the diameter of the downward pipe 108 is D (2), D (1) is larger than D (2). Designed. In addition, the relationship between the horizontal pipe 106 and the downward pipe 108 in the pipe 100 with an inlet according to the present embodiment is not limited to the one defined by the diameter. That is, it includes everything designed so that the cross-sectional area of the horizontal pipe 106 is larger than the cross-sectional area of the downward pipe 108.
[0046]
Further, as for the cross-sectional area S (3) of the inlet 110, if the cross-sectional area of the horizontal pipe 106 is S (1) and the cross-sectional area of the downward pipe 108 is S (2), S (3) <｛S ( 1) + S (2)｝ holds. That is, the cross-sectional area S (3) of the inlet 110 is smaller than the sum of the cross-sectional area S (1) of the horizontal pipe 106 and the cross-sectional area S (2) of the downward pipe 108 into which the cooling water flows. Cooling water cannot be injected at once. Therefore, even if the cooling water injected from the inlet 110 flows into only one of the horizontal pipe 106 and the downward pipe 108, the horizontal pipe 106 or the downward pipe 108 is blocked by the cooling water. Nothing. Actually, the cooling water injected from the inlet 110 flows into both the horizontal pipe 106 and the downward pipe 108, so that the horizontal pipe 106 or the downward pipe 108 is not reliably blocked by the cooling water.
[0047]
The operation when the cooling water is injected into the cooling system including the pipe 100 with the inlet having the above structure will be described. An operator opens the cap 102 of the pipe 100 with an inlet and injects cooling water from the inlet 110. When the injected cooling water is injected from the injection port 110, it flows down toward the PCU 200 mainly through the downward hose 108 according to gravity. However, in practice, it also slightly flows into the horizontal pipe 106.
[0048]
In the pipe with an inlet 100 according to the present embodiment, the cross-sectional area of the horizontal pipe 106 is larger than the cross-sectional area of the downward pipe 108 (specifically, D (2) = 16 mm, D (1) = 19 mm), a space in which the inside of the pipe is not blocked by the cooling water can be provided in the horizontal pipe 106 as shown in FIG. For this reason, exchange of air and cooling water can be performed smoothly.
[0049]
Further, since the cross-sectional area S (3) of the inlet 110 is smaller than the sum of the cross-sectional area S (1) of the horizontal pipe 106 and the cross-sectional area S (2) of the downward pipe 108, from the inlet 110, Cooling water is not injected beyond the volume regulated by the cross-sectional area S (3) of the inlet 110. Therefore, it is not possible to inject an amount of cooling water that blocks only one of the horizontal pipe 106 and the downward pipe 108.
[0050]
When the cooling water is supplied from the charging section 100 while smoothly performing such air-water exchange, both ends of the closed path are closed because one end of the closed path of the cooling system has a space formed by the horizontal pipe 106. Nothing. As a result, a sufficient amount of cooling water can be supplied to the cooling system in a short time.
[0051]
Initially, the cooling water flows toward the PCU 200 through the downward pipe 108, and is filled from the PCU 200 into the radiator 300 via the electric water pump 400 and the lower tank 312. As the radiator 300 is filled, the level of the cooling water inside the radiator rises and reaches the upper tank 304.
[0052]
The cooling water that has reached the upper tank 304 and the cooling water that has flowed from the horizontal pipe 106 of the pipe 100 with an inlet fill the hose 500. However, since the diameters of the hose 500 and the horizontal pipe 106 are large, gas-liquid exchange can be sufficiently performed as shown in FIG. 7 as described above.
[0053]
As described above, the pipe with an inlet according to the present embodiment includes an inlet that is opened upward, a tank provided below the inlet, and a horizontal pipe and a downward pipe provided in the tank. . The cross-sectional area of the horizontal pipe is larger than that of the downward pipe. Also, the cross-sectional area of the inlet is smaller than the sum of the cross-sectional area of the horizontal pipe and the cross-sectional area of the downward pipe. The cooling water injected from the inlet mainly flows to the downward pipe, but a part of the cooling water flows to the horizontal pipe. Further, the cooling water flowing through the downward pipe reaches the horizontal pipe through a closed circuit. Even at this time, since the diameter of the horizontally oriented pipe is large, the water and water exchange can be sufficiently performed. Since the cross-sectional area of the inlet is smaller than the sum of the cross-sectional area of the horizontal pipe into which the cooling water flows and the cross-sectional area of the downward pipe, the injected cooling water should have flowed into one of the horizontal pipe and the downward pipe. Even so, the pipe cannot be closed with cooling water. Therefore, the cooling water supplied from the charging port can be filled in the cooling system in a short time. As a result, with a simple structure change of changing the pipe diameter, the filling time of the cooling water can be shortened, and a sufficient amount of the cooling water can be injected into the closed circuit of the cooling system.
[0054]
The embodiments disclosed this time are to be considered in all respects as illustrative and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.
[Brief description of the drawings]
FIG. 1 is a system configuration diagram of a vehicle on which a pipe with an inlet according to the present embodiment is mounted.
FIG. 2 is an on-vehicle layout diagram of components of a vehicle on which the pipe with an inlet according to the present embodiment is mounted.
FIG. 3 is a configuration diagram of a cooling system including a pipe with an inlet according to the present embodiment.
FIG. 4 is a perspective view showing a configuration of a cooling system including a pipe with an inlet according to the present embodiment.
FIG. 5 is a perspective view (part 1) showing a pipe with an inlet according to the present embodiment.
FIG. 6 is a perspective view (part 2) showing a pipe with an inlet according to the present embodiment.
FIG. 7 is a diagram showing a cross section of a pipe with an inlet according to the present embodiment.
FIG. 8 is a configuration diagram of a cooling system including a conventional pipe with an inlet.
[Explanation of symbols]
100, 1100 Piping with inlet, 102 cap, 104 tank, 106 horizontal pipe, 108 downward pipe, 110 inlet, 120 fixing stay, 130 hose clip, 200, 1200 PCU, 202, 1202 cooling water inlet, 204 , 1204 cooling water outlet, 300, 1300 radiator, 302, 1302 upper tank, 304, 1304 upper tank pipe, 312, 1312 lower tank, 314, 1314 lower tank pipe, 350 engine radiator, 352, 354 engine cooling water pipe, 400 , 1400 electric water pump, 500, 1500 horizontal hose, 502, 1502 downward hose, 504, 506, 1504, 1506 hose, 1002 engine, 1004 torque converter, 006 Automatic transmission, 1008 output shaft, 1010 damper pulley with built-in electromagnetic clutch, 1014 belt, 1016, 1018 pulley, 1020 accessories, 1026 motor generator, 1040 engine room, 1042 guest room, 1102 inverter, 1104 DC / DC converter, 1110 unit Case, 1110a Upper case (first case member), 1110b Lower case (second case member), 1112 ground terminal, 1118 bus bar, 1120 opening, 1122 terminal block, 1126 cover, 1130b, 1130c Connection in first power supply system Line, 1130d connection line in the second power supply system, 1311a to 1131c power line, 1140 high-voltage power supply (rated voltage 36V), 1150 (rated voltage 12V), 1162a to 1162c terminal section, 70a~1170e connector 1172 integrated case, 1180 cooling channel, 1210 air vent plug.

Claims (5)

A pipe with a refrigerant inlet incorporated in a cooling system for cooling a power converter that supplies power to a motor mounted on a vehicle,
An inlet for injecting the refrigerant from above,
A gap connected below the inlet and having a predetermined space,
A first conduit connected to the gap and extending substantially horizontally;
A second conduit connected to the gap and extending downward,
A cross-sectional area of the first pipe is larger than a cross-sectional area of the second pipe;
A pipe with a refrigerant inlet, wherein a cross-sectional area of the inlet is smaller than a sum of a cross-sectional area of the first pipe and a cross-sectional area of the second pipe. The pipe with an inlet for a refrigerant according to claim 1, wherein the second pipe includes a pipe extending obliquely downward. The cooling system includes a radiator that dissipates heat of the refrigerant,
The first conduit is connected to the radiator;
The refrigerant pipe according to claim 1 or 2, wherein the second conduit is connected to the power converter. The piping with a refrigerant inlet according to claim 3, wherein the radiator is a downflow type. A cooling system comprising the pipe with an inlet according to claim 1.

Images