JP2012023141A - Cooling unit of electrical heating element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cooling unit of an electrical heating element, which prevents the occurrence of dew condensation water without having high airtightness and also prevents inflammation even in the presence of inflammable gas to stabilize quality in a driving motor used for an air blower of a cooling unit of an electrical heating element.SOLUTION: A cooling unit of an electrical heating unit is provided with an electrical heating element 2, which is at least partially exposed to the interior of a case 4 in which an air flow passage 3 is defined, an air blower 6 having an impeller and a driving motor, and a cooler 7 cooling the air in the air flow passage 3. Further, all members constructing the driving motor are housed in the air flow passage 3.

Description

  The present invention relates to a heating element cooling unit that cools a heating element.

  Inverters, batteries, and the like that control drive motors for electric vehicles generate heat due to use and cause performance degradation, and thus require cooling.

  These heating elements can be cooled by introducing the outside air through communication between the periphery of the heating elements and the outside of the vehicle, or by circulating air in the case containing the heating elements, the cooling device, and the blower. There is one that forms a passage and cools the heating element by the cooled circulating air. In addition, there are some which cool by combining these methods. As an example, a case that defines a cooling passage that can be circulated, a battery that is partially or entirely exposed in the cooling passage, and the cooling An evaporator disposed in the passage, a refrigerant bypass passage connected to a compressor and a condenser of a refrigeration cycle of an air conditioner and including at least expansion means and the evaporator, and a blower disposed in the cooling passage. A battery cooling device is disclosed (see Patent Document 1).

  By the way, the components inside the drive motor of the blower, in particular the control board, are prevented from adhering water droplets that are covered by the housing and flying because there are concerns about the occurrence of rust and short circuits due to the adhering water droplets. However, since securing the airtightness in the housing has the following disadvantages, it is impossible to prevent water vapor from entering from the outside of the housing, and when the drive motor including the housing is cooled, condensed water is contained inside the housing. May occur and adhere to the control board. Therefore, in order to prevent the condensed water generated from staying indefinitely, the inside and outside of the housing are connected to each other while preventing intrusion of flying water droplets, and the air from the outside of the housing is guided to evaporate the condensed water. The structure which provides the breathing hole which promotes this in a housing is known (refer patent document 2).

JP 2002-31441 A JP-A-9-074718

  However, if the breathing hole (cooling air introduction port) as in Patent Document 2 is formed in the housing of the drive motor, it has not been solved that the water vapor that has entered the housing is cooled and condensed water is generated. In other words, it is not a drastic measure for preventing water droplets from adhering to the control board.

  Therefore, in order to prevent water vapor from entering the inside of the housing of the drive motor, it is conceivable to eliminate the breathing hole and improve the sealing performance of the housing. However, the rotating shaft that communicates the inside and outside of the housing has a bearing portion so that it can rotate, and adding a function to completely prevent water vapor from entering the bearing portion increases the cost. Leads to. Furthermore, even if the bearing portion is configured to completely prevent the intrusion of water vapor, the movement of gas inside and outside the housing is blocked, so that when the operating pressure environment of the drive motor changes, the pressure difference between the inside and outside of the housing There is a disadvantage that the housing becomes larger and needs to be configured to withstand this pressure difference, leading to an increase in size, weight, and cost of components.

  The present invention has been made in view of the above-described problems, and is used in a blower of a heating element cooling unit, and in a drive motor that blows cooled air, the generation of condensed water without providing high sealing performance. The purpose is to stabilize the quality of the heating element cooling unit.

  By the way, in the storage and discharge of batteries such as lead, nickel-cadmium (Ni-Cd), nickel hydride (Ni-MH) lithium ion (Li-ion), flammable gas such as hydrogen is generated by chemical reaction. For this reason, when the drive motor is operated in a sealed case, there is a risk of ignition by a spark generated during operation depending on the type of the drive motor installed.

  Accordingly, a second object of the present invention is to prevent ignition even in the presence of a combustible gas in a drive motor used in a fan of a heating element cooling unit, thereby stabilizing the quality of the heating element cooling unit. To do.

A heating element cooling unit according to the present invention includes a heating element in which at least a part thereof is exposed to the air flow path, an impeller, and a drive motor in a case in which an air flow path through which air can flow is defined. And a cooler for cooling the air in the air flow path, and all the members constituting the drive motor are accommodated in the air flow path.
Here, the member constituting the drive motor includes, for example, a rotating shaft that rotates a rotating member such as an impeller attached to one end in a direction along the longitudinal direction, and the rotating shaft attached to the rotating shaft. A rotor assembly that is capable of rotating together with the rotor assembly, a stator assembly that faces the rotor assembly in a direction along the radial direction of the rotating shaft, and is arranged so as not to rotate with the rotating shaft. A control board provided at a position close to one end side in a direction along the axial direction, and a rotation axis at a position on one end side of the control board in a direction along the longitudinal direction of the rotation axis A housing formed to extend outward along the radial direction of the control board, enclose the control board, the rotor assembly, and the stator assembly, and these members. A motor main body and the like.

  By accommodating all the members constituting the drive motor in the air flow path in the case, the heating element cooling unit is operated, the drive motor is cooled, and water vapor inside the drive motor housing is generated as condensed water. In the first place, the amount of water vapor in the air flow path is limited, and the amount of water vapor that can enter the housing is also very limited, so that the growth of condensed water can be prevented. In addition, since the cooler is provided in the case, the cooler is the coldest of the installed equipment, and even if dew condensation occurs, it is limited to the cooler and its vicinity, while the drive motor is The temperature is also high, and condensation of condensed water inside the housing is prevented. As the drive motor continues to operate, the temperature inside the drive motor rises due to heat generated by the stator assembly, and the relative humidity of the air inside the housing is lower than the air outside the housing of the drive motor. It becomes possible to prevent generation of water.

  The case of the heating element cooling unit includes a first opening through which air outside the case can be introduced, a case outside air introduction door capable of opening and closing the first opening, and the air flow path. A second opening that can discharge air, and a case internal air discharge door that can open and close the second opening, and the first opening is closed by the case outside air introduction door, When the second opening is closed by the case inside air discharge door, the air can circulate through the air flow path, and the first opening is opened by the case outside air introduction door, When the second opening is opened by the case inside air discharge door, the air introduced into the air flow path from the first opening exchanges heat with the heating element and the second opening. It is supposed to be discharged from the department That it is characterized by desirable.

When the first opening and the second opening are respectively closed by the door, it is possible to prevent water from flying from the outside of the case by allowing the air flow path to circulate. For this reason, even if the drive motor is not completely waterproof (highly sealed), such as when a breathing hole is drilled in the housing of the drive motor mounted in the air flow path, It becomes possible to prevent water from entering. In addition, the air flow path is closed and the amount of water vapor is limited, and the amount of water vapor that can enter the housing can be very limited, thus preventing the growth of condensed water inside the housing. Can do.
In addition, when each of the doors is opened with respect to the first opening and the second opening, air introduced from the first opening exchanges heat with the heating element, and the first opening. By being discharged from the two openings, the heating element can be cooled without starting the refrigeration cycle, and energy consumption can be reduced.
Here, as the case outside air introduction door and the case inside air discharge door, for example, a cantilever door, a butterfly door, a slide door, or the like is used.

  Furthermore, the drive motor is preferably a brushless motor, and the heating element is preferably a battery.

  Since the drive motor is a brushless motor, sparks do not fly from the brush, and even if flammable gas is volatilized from the battery, accidents due to ignition can be prevented.

According to the present invention described above, the air flow path can contain all the members constituting the drive motor, so that the amount of water vapor that can enter the housing of the drive motor can be limited to a limited amount. Generation of water can be prevented, and the quality of the heating element cooling unit can be stabilized. In addition, since the cooler is provided in the case, the cooler is the coldest of the installed equipment, and even if dew condensation occurs, it is limited to the cooler and its vicinity, while the drive motor is However, the temperature is high and the condensation of the housing is prevented from being generated, so that the quality of the heating element cooling unit can be stabilized. If the drive motor continues to be driven, the temperature inside the drive motor rises, the relative humidity of the air inside the housing decreases compared to the air outside the housing, and the generation of condensed water can be prevented more reliably. It becomes possible to stabilize the quality of the cooling unit.
In particular, according to the invention described in claim 2, when the first opening and the second opening are respectively closed by the door, the case can be circulated through the air flow path. It is possible to prevent water from coming from the outside. This prevents water from entering the housing even when the drive motor is not completely waterproof, such as when a breathing hole is drilled in the drive motor housing mounted in the air flow path. It becomes possible to prevent problems such as rust of the drive motor. In addition, the air flow path is closed and the amount of water vapor is limited, and the amount of water vapor that can enter the housing can be very limited, thus preventing the growth of condensed water inside the housing. Can do. On the other hand, when the doors are opened with respect to the first opening and the second opening, air introduced from the first opening exchanges heat with the heating element. Thus, since the heating element can be cooled without starting the refrigeration cycle, the energy efficiency can be improved.
Furthermore, according to the invention described in claim 3, since the drive motor is a brushless motor, even if flammable gas is volatilized from the battery, an accident due to ignition can be prevented.

FIG. 1A is an explanatory cross-sectional view of a main part of the heating element cooling unit according to the first embodiment, and FIG. 1B is a control block diagram thereof. FIG. 2 is a configuration diagram showing the overall structure of the drive motor. FIG. 3 is a control flow illustrating control of the heating element cooling unit according to the first embodiment. FIG. 4A is an explanatory cross-sectional view of a main part of the heating element cooling unit according to the second embodiment, and FIG. 4B is a control block diagram thereof. FIG. 5A is a configuration diagram showing a state of the inside air mode of the heating element cooling unit, and FIG. 5B is a configuration diagram showing a state of the outside air mode. FIG. 6 is a control flow illustrating control of the heating element cooling unit according to the second embodiment. FIG. 7A is a configuration diagram showing a state of the inside air mode of the heating element cooling unit, and FIG. 7B is a configuration diagram showing a state of the outside air mode.

  The heating element cooling unit of the present invention will be described below with reference to the drawings.

  In the heating element cooling unit 1 according to the embodiment of the present invention, as shown in FIG. 1, an air flow path 3 is defined in a resin case 4 so that air can flow. The air flow path 3 is formed by dividing the case 4 by a partition member (partition wall) 8, and is partitioned from a first flow path 3a connected to a refrigeration cycle 10 described later and the first flow path 3a. The second flow path 3b is formed on the opposite side of the wall, and the first flow path 3a and the second flow path are formed to communicate with each other. The first flow path 3a is provided with at least a part of the battery (heating element) 2 exposed and installed with an evaporator (cooler) 7 for cooling the air passing through the air flow path 3. A blower 6 is installed in the second flow path 3b.

  In this air flow path 3, a blower 6 is arranged on the downstream side of the evaporator 7, so that the cooling air in the air flow path 3 passes through the evaporator 7 after passing through the battery 2 and then passes through the blower 6. Has been placed. An inside air temperature sensor 85 that detects the temperature of the air flow path 3 is provided between the battery 2 and the evaporator 7, for example. The inside air temperature sensor 85 may be disposed so as to be in contact with the battery 2 and used as a heating element temperature detecting means.

  As shown in FIG. 2, the blower 6 includes an impeller 62 that blows air sucked from the axial direction outward, and a drive motor 61 that rotates the impeller 62.

  The impeller 62 includes a boss portion 65 fixed to the rotation shaft 64 of the drive motor 61, a cone portion 66 connected to the boss portion 65, and an axial direction of the rotation shaft 64, and the cone portion 66. It has a plurality of blades 67 provided along the circumferential direction of the outer peripheral edge.

  The drive motor 61 includes a rotating shaft 64, a boss portion 68, a stator assembly 69 mounted on the outer peripheral surface of the boss portion 68, a control board 70, a rotor assembly 71, and a housing 72 to form a motor main body portion 74. The brushless motor is employed, and all members constituting the drive motor 61 are accommodated in the air flow path 3.

  Among these, the rotating shaft 64 has a substantially rod shape, and the rotating member such as the impeller 62 is rotated by attaching the rotating member such as the impeller 62 to one side end which is the upper end side in the longitudinal direction. It is possible. The rotating shaft 64 is rotatably supported by a cylindrical boss portion 68 extending downward from the housing 72 along the axial direction of the rotating shaft 64 via bearings 75 and 76.

  A stator assembly 69 is disposed on the lower side of the outer peripheral surface extending along the axial direction of the rotating shaft 64 of the boss portion 68. The stator assembly 69 includes an iron core 26 and an armature winding 25 wound around the side outer peripheral surface of the core 26 a plurality of times. The stator assembly 69 is fixed to the inner surface of the housing 72 through the boss portion 68.

  Further, the rotor assembly 71 is attached to the rotating shaft 64 below the stator assembly 69 in the axial direction of the rotating shaft 64. The rotor assembly 71 is at a position facing the stator assembly 69 in the direction along the radial direction of the rotating shaft 64, and the yoke 29 and the yoke 29 are opposed to the armature winding 25. It is comprised with the magnet 79 provided in the inner surface.

  The evaporator 7 has heat radiating fins such as corrugated fins and cools the air by evaporating the refrigerant, and is connected to the refrigeration cycle 10 of the vehicle air conditioner via the refrigerant bypass passage 11. On the upstream side of the evaporator 7, an expansion device (for example, a mechanical expansion valve, an electric expansion valve or an orifice tube whose valve opening degree is variable by an external signal) 12 is provided. In this embodiment, the refrigeration cycle 10 is connected to a driving engine (not shown) via an electromagnetic clutch 13 and driven by a compressor 14, a condenser 15 that condenses the refrigerant compressed by the compressor 14, and the condenser 15, a liquid tank 19 that separates the gaseous refrigerant and the liquid refrigerant from the refrigerant mixed with gas and liquid, and an air conditioning expansion device that expands the liquid refrigerant to reduce the pressure (for example, mechanical type). (An expansion valve, an electric expansion valve or an orifice tube whose valve opening degree is variable by an external signal, etc.) 16 and the refrigerant having a low pressure are evaporated by this air conditioning expansion device 16 to cool the air passing through the air conditioning duct 18. An air conditioning evaporator 17, and the refrigerant bypass passage 11 is connected to the air conditioning expansion device. It is connected in parallel to 16 and air-conditioning evaporator 17. The compressor 14 may be an electric compressor.

  Further, a first on-off valve 20 that opens and closes the refrigerant bypass passage 11 is provided on the refrigerant bypass passage 11. A second on-off valve 21 is provided between the branch point of the air conditioning expansion device 16 and the refrigerant bypass passage 11 to turn on and off the refrigerant flow toward the air conditioning expansion device 16. As a result, when only the vehicle air conditioner is to be operated and cooled, the first on-off valve 20 is closed and the second on-off valve 21 is opened to operate the compressor 14. Further, when the evaporator 7 is to be operated in parallel when the vehicle air conditioner is operating and cooling, the compressor 14 is operated with the first on-off valve 20 opened and the second on-off valve 21 opened. To do. Further, when the vehicle air conditioner does not require cooling of the passenger compartment, but only the evaporator 7 is to be operated, the first on-off valve 20 is opened and the second on-off valve 21 is closed, and the compressor 14 is turned on. Operate.

The operation control of the heating element cooling unit 1 described above is preferably controlled as part of the air conditioning control by the control unit 40 that performs the air conditioning control mounted on the vehicle.
FIG. 1B is a block diagram showing input / output of the control unit 40 provided in the fuel cell system. The fuel cell system is provided with a control unit 40 as control means for performing various controls. The control unit 40 is composed of a well-known microcomputer comprising a CPU, ROM, RAM, etc. and its peripheral circuits. Sensor signals and the like from various sensors are input to the control unit 40, and at least a signal is input from an inside air temperature sensor 85 that detects the temperature inside the air flow path 3. Moreover, the control part 40 outputs a control signal to the refrigerating cycle 10, the air blower 6, etc. based on a calculation result. In the present embodiment, the control of the fuel cell system and the air conditioning control are controlled by the same control unit 40. However, a separate control unit may be provided to perform communication between different control units.

With the above configuration, the heating element cooling unit 1 is controlled by the control unit 40 as in the flow shown in FIG.
That is, when the ignition ON of the vehicle is detected (S101: YES), it is determined whether or not the temperature inside the air flow path 3 exceeds a predetermined value (for example, 40 ° C.) based on the signal input of the inside air temperature sensor 85 ( S102). When it is determined that the temperature in the air flow path 3 has exceeded a predetermined value (S102: YES), the controller 40 starts the refrigeration cycle 10 and starts the blower 6 (S103). Even after the start of the refrigeration cycle 10, if the temperature in the air flow path 3 exceeds a predetermined value (S104: YES), the capacity of the refrigeration cycle 10 is increased to operate (S105). Thereafter, when an ignition OFF signal is detected (S106: YES), the operation of the refrigeration cycle 10 and the blower 6 is terminated (S107).

As described above, the air flow path 3 accommodates all the members constituting the drive motor 61, so that the amount of water vapor in the air flow path 3 is limited in the first place. Since the amount of water vapor that can enter the water can also be limited, the growth of condensed water can be prevented. In addition, since the evaporator 7 is provided in the air flow path 3, the evaporator 7 has the lowest temperature among other devices provided, and even if condensed water is generated in the air flow path 3, the evaporator 7 and the vicinity thereof are provided. On the other hand, the temperature of the drive motor 61 is higher than that of the evaporator 7, the dew condensation in the housing 72 is prevented from being generated, and the quality of the heating element cooling unit 1 can be stabilized. When the drive motor 61 continues to be driven, the temperature inside the motor rises due to the heat generated by the armature winding 25 of the stator assembly, the heat generated from the control board 70, and the like. The relative humidity is lowered, and the generation of condensed water can be prevented more reliably, and the quality of the heating element cooling unit 1 can be stabilized.
Furthermore, since the drive motor 61 is a brushless motor, there is no possibility of sparks flying like a brush motor, so that even if flammable gas is volatilized from the battery 2, an accident due to ignition can be prevented.

  The drive motor 61 is preferably disposed downstream of the heating element 2. Since the air flow path 3 has a high temperature and a low relative humidity, the drive motor 61 is disposed here, so that dew condensation in the motor can be prevented more reliably.

  By the way, when the heating element cooling unit 1 is operated, condensed water may be generated in the evaporator 7 and the vicinity thereof. However, when the air passage 3 is used as a substantially closed space as described above, water vapor is generated by the heating element. Since it is not supplied from the outside of the cooling unit 1 and thus a large amount of condensed water is not generated, it is not essential to install a drain port (drain hole) for condensed water.

  In the above embodiment, only the air inside the case 4 is circulated to cool the battery 2. However, when the temperature of the air outside the case 4 (outside air) is sufficiently low, the outside air is passed through the air flow. Cooling may be performed by introducing into the passage 3. Hereinafter, specific contents of the present embodiment will be described. In the same configuration as that of the first embodiment, the same portions are denoted by the same reference numerals, and description thereof is omitted.

Specifically, as shown in FIG. 4 (a), the heating element cooling unit 1 according to the present embodiment has an outside air introduction opening (first opening) communicating with the outside of the case 4 on the uppermost stream side of the first flow path 3a. ) 22a, which is disposed upstream of the battery 2 and at a position facing the evaporator 7. In addition, a case outside air introduction door 91 capable of opening and closing the outside air introduction opening 22a is provided in the vicinity of the outside air introduction opening 22a.
Here, it is preferable that the outside air introduction opening 22 a is provided at a position where the outside air introduced when the outside air is introduced directly hits the battery 2 without hitting an obstacle such as the inner wall of the case 4. Although the case 4 may have unintentional heat depending on the layout of the vehicle, the battery 2 can be reliably cooled by providing the outside air introduction opening 22a at a position where the outside air directly hits in this way. .

Further, an inside air discharge opening (second opening) 22b communicating with the outside of the case 4 is provided at a position on the most downstream side of the second flow path 3b, and the inside air discharge opening 22b is provided in the vicinity of the inside air discharge opening 22b. The case interior air discharge door 92 is openable and closable.
Further, an outside air temperature sensor 86 for detecting the temperature outside the case 4 is provided, for example, at a position close to the blower 6 outside the case 4.

In addition, two communication paths 8c and 8d communicating both the flow paths 3a and 3b are formed by cutting out the partition wall 8 at both ends of the first flow path 3a and the second flow path 3b.
The communication path 8c is provided in the vicinity of both the openings 22a and 22b, and is formed to have a width shorter than the entire length of the case inside air discharge door 92.
The communication path 8d is formed to have a width equivalent to the width direction of the impeller 62 of the blower 6. Alternatively, although not illustrated, a conventionally known bell mouth shape may be provided in the vicinity of the suction portion of the impeller so that the impeller 62 can blow air efficiently.

  The case outside air introduction door 91 and the case inside air discharge door 92 are disposed so as to be swingable around the outside air introduction opening 22a and the inside air discharge opening 22b, and the diameters of the rotation shafts 91a and 92a and the rotation shafts 91a and 92a. It is a cantilever type comprising plate-like door bodies 91b and 92b extending in the direction, and the opening portions 22a and 22b are opened and closed by actuators 30 and 31, respectively.

  Further, as shown in FIG. 5 (a), when the case outside air introduction door 91 and the case inside air discharge door 92 close both the openings 22a and 22b, the air flow path 3 communicates with each other in a circulatory manner. In addition, as shown in FIG. 5B, when the case outside air introduction door 91 and the case inside air discharge door 92 open the opening 22, the communication path 8 c becomes the case inside air discharge door 92. Thus, after the outside air introduced through the outside air introduction opening 22a cools the battery 2, the outside air mode is obtained in which it passes through the evaporator 7 and the communication path 8d and is discharged from the inside air discharge opening 22b.

  Here, switching between the outside air mode and the inside air mode is controlled by the control unit 40 as part of the air conditioning control, and is performed using a signal from the outside air temperature sensor 86.

  Specifically, as shown in FIG. 4B, in addition to the configuration of the first embodiment, an outside air temperature sensor 86 for detecting the temperature outside the case 4 is input to the control unit 40, and the actuator 30 and 31 are configured to be output.

With the above configuration, the heating element cooling unit 1 is controlled by the control unit 40 as in the flow shown in FIG.
That is, when it is detected that the temperature in the air flow path 3 exceeds the first predetermined value (for example, 40 ° C.) (S202: YES) and the temperature outside the case 4 is equal to or lower than the second predetermined value (for example, 20 ° C.) ( S203: YES), a signal is output to the actuators 30 and 31, and the case outside air introduction door 91 and the case inside air discharge door 92 are opened. Next, when the temperature outside the case 4 rises above a third predetermined value (for example, 30 ° C.) (S205), the case outside air introduction door 91 and the case inside air discharge door 92 are closed and the refrigeration cycle 10 is started. Thereafter, when an ignition OFF signal is detected (S207: YES), the operation of the refrigeration cycle 10 and the blower 6 is terminated (S208).
On the other hand, if it is determined in step S203 that the temperature outside the case 4 is not equal to or lower than the second predetermined value (S203: NO), the case outside air introduction door 91 and the case inside air discharge door 92 are closed and the refrigeration cycle 10 is performed. Start (S206).
If it is determined in step S205 that the temperature outside the case 4 does not exceed the third predetermined value (S205: NO) and ignition OFF is detected (S209: YES), the case outside air introduction door 91, the case The inside air discharge door 92 is closed to finish the operation (S210).

As described above, the air flow path 3 includes the openings 22a and 22b communicating with the outside of the case 4, the case outside air introduction door 91, and the case inside air discharge door 92 that can be opened and closed. In the mode, it is possible to prevent water from flying from the outside of the case 4.
On the other hand, when the temperature of the outside air is sufficiently low, the battery 2 can be cooled without starting the refrigeration cycle 10 by selecting the outside air mode, so that energy efficiency can be improved. Become.

  In the above embodiment, the case outside air introduction door 91 and the case inside air discharge door 92 have been described as separate bodies, but they may be performed by one door. In other configurations, the same parts as those in the above-described embodiment are denoted by the same reference numerals, and description thereof is omitted.

  Specifically, as shown in FIGS. 7A and 7B, a butterfly door 93 is provided in the opening portion 22 so that the plate door 93 b can swing around the rotation shaft 93 a and the actuator 33. Is connected to the rotating shaft 93a.

Therefore, in the above-described inside air mode in which the air in the air flow path 3 is circulated, the door 93 is disposed so as to close the opening 22 as shown in FIG. In the case of the above-described outside air mode to be introduced, as shown in FIG. 7B, the door 93 is disposed so as to block the communication path 8c.
Thus, by controlling with one door, the number of parts can be reduced.

In the above-described configuration, the case outside air introduction door 91 and the case inside air discharge door 92 are cantilever doors. However, the circulation of the inside air in the air flow path 3 and the introduction of outside air can be selected. What is necessary is just a thing, for example, a butterfly type and a sliding type door may be sufficient.
Further, the communication path 8c is closed by the case inside air discharge door 92, but it may be closed by the case outside air introduction door 91 or may be closed by both the doors 91 and 92. Further, the communication path 8c may be closed gradually by a plate that can slide from the partition member 8 to the end of the communication path 8c.
Furthermore, although the partition member 8 has been described as a partition wall, the partition member 8 may be a guide for adjusting the flow of air. The member 8 may not be provided.
Furthermore, a filter that prevents entry of foreign matters such as dust contained in the outside air may be provided between the outside air introduction opening 22a and the battery 2.
Further, the heating element is not limited to a battery, and may be an inverter or the like. Here, when an inverter or the like is used, since a combustible gas is not generated in the case 4, a drive motor 61 other than a brushless motor may be used.

DESCRIPTION OF SYMBOLS 1 Heat generating body cooling unit 2 Battery 3 Air flow path 3a 1st flow path 3b 2nd flow path 4 Case 6 Blower 7 Evaporator 8 Partition member (partition wall)
8c, 8d Communication path 22 Opening 22a First opening 22b Second opening 61 Drive motor 62 Impeller 91 Case outside air introduction door 92 Case inside air discharge door

Claims (3)

In the case where the air flow path through which air can flow is defined inside,
A heating element at least a part of which is exposed to the air flow path;
A blower configured to include an impeller and a drive motor;
A cooler for cooling the air in the air flow path,
All the members which comprise the said drive motor are accommodated in the said air flow path, The heat generating body cooling unit characterized by the above-mentioned. The case is
A first opening through which air outside the case can be introduced;
A case outside air introduction door capable of opening and closing the first opening;
A second opening capable of discharging air in the air flow path;
A case internal air discharge door capable of opening and closing the second opening;
And having
When the first opening is closed by the case outside air introduction door and the second opening is closed by the case inside air discharge door, the air can circulate through the air flow path,
When the first opening is opened by the case outside air introduction door and the second opening is opened by the case inside air discharge door, the air flow path is introduced from the first opening. 2. The heating element cooling unit according to claim 1, wherein the air is exchanged with the heating element and discharged from the second opening. The drive motor is a brushless motor,
The heating element cooling unit according to claim 1, wherein the heating element is a battery.

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