JP2019206261A - Vehicular air conditioner - Google Patents

Abstract

To improve heating efficiency.SOLUTION: A vehicular air conditioner 1 includes: a heat pipe system 3 having a heat absorbing section 31 for absorbing heat of exhaust gas G discharged by an engine 2 and a heat release section 32 for releasing heat of the exhaust gas G absorbed by the heat absorbing section 31; a cooling water flow passage 4 in which cooling water W is caused to flow and which has the engine 2, a heater core 6 and the heat release section 32 of the heat pipe system 3 disposed on the flow passage; and a four-way valve 43 for switching the cooling water flow passage 4 from a single flow passage passing through the engine 2, the heater core 6 and the heat release section 32 to two flow passages which are a first flow passage 41 passing through an internal combustion engine and a second flow passage 42 passing through the heater core 6 and the heat release section 32. At a start of the engine 2, the cooling water flow passage 4 is switched to the two flow passages by the four-way valve 43.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a vehicle air conditioner.

  The vehicle air conditioner uses the heat of the engine and the heat of the exhaust gas discharged from the engine to heat the interior of the vehicle (see, for example, Patent Document 1). The vehicle air conditioner includes a cooling water passage through which engine cooling water circulates and a heat pipe system that recovers heat of exhaust gas. The heat absorption part of the heat pipe system arranged in the exhaust pipe that discharges the exhaust gas of the engine collects the heat of the exhaust gas, and the heat radiation part arranged in the cooling water flow path radiates the heat of the exhaust gas to raise the temperature of the cooling water. The cooling water is further heated by the heat of the engine when passing through the engine. A heater core is installed in the cooling water flow path, and the interior of the vehicle is heated by exchanging heat with the air blown into the vehicle interior by the blower fan in the heater core. .

Japanese Patent No. 5381337

  However, since the engine is not yet warmed up when the engine is started, the temperature of the cooling water due to the heat of the engine is not sufficient. Furthermore, since the cooling water flow path is configured to pass through the engine, the heater core, and the heat radiating portion, the capacity of the cooling water passing through the flow path is also increased. If the heat capacity of the cooling water is large, the temperature of the cooling water is difficult to increase, and the heating efficiency in the vehicle may be reduced.

  In a vehicle air conditioner, it is required to quickly increase the temperature of cooling water at the time of starting an engine to improve heating efficiency.

The vehicle air conditioner of the present invention is
An exhaust heat recovery part comprising an endothermic part that absorbs the heat of the exhaust gas exhausted by the internal combustion engine and a heat dissipation part that releases the heat of the exhaust gas absorbed by the endothermic part;
A heat medium flow path in which a heat medium is circulated, and the internal combustion engine, the heater core, and the heat dissipation section of the exhaust heat recovery section are disposed on the flow path;
A first flow path that passes through the internal combustion engine, a first flow path that passes through the internal combustion engine, and a first flow path that passes through the heater core and the heat dissipation section from the single flow path that passes through the internal combustion engine, the heater core, and the heat dissipation section. A switching unit that switches between two channels of the two channels,
At the time of starting the internal combustion engine, the switching unit switches the heat medium flow path to the two flow paths.

  ADVANTAGE OF THE INVENTION According to this invention, at the time of engine start, a cooling water can be heated up rapidly, heating efficiency can be improved, and the convenience is high.

It is a schematic block diagram of the vehicle air conditioner which concerns on embodiment, and is a figure which shows the state which connected the 1st flow path and the 2nd flow path. It is a figure which shows the state which isolate | separated the 1st flow path and the 2nd flow path. It is a block diagram which shows the structure of a controller. It is a schematic block diagram of the vehicle air conditioner which concerns on the modification 1. FIG. It is a schematic block diagram of the vehicle air conditioner which concerns on the modification 2.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a schematic configuration diagram of a vehicle air conditioner 1 according to an embodiment, and shows a state in which a first flow path 41 and a second flow path 42 are connected.
FIG. 2 is a diagram illustrating a state where the first flow path 41 and the second flow path 42 are separated.
The vehicle air conditioner 1 according to the embodiment is installed in a vehicle having an engine 2 for driving a vehicle, and uses the heat of the engine 2 and the heat of the exhaust gas G of the engine 2 to heat the vehicle interior. is there.

As shown in FIG. 1, the vehicle air conditioner 1 includes a heat pipe system 3 that recovers the heat of the exhaust gas G, and a cooling water passage 4 that distributes the cooling water W of the engine 2.
The heat pipe system 3 includes a heat absorption part 31 that absorbs heat of the exhaust gas G, a heat dissipation part 32 that releases heat of the exhaust gas G, and a loop heat pipe that circulates the working medium M between the heat absorption part 31 and the heat dissipation part 32. 33 is provided.
The heat pipe 33 can be made of a metal material such as copper or aluminum alloy having high thermal conductivity or stainless steel having excellent heat resistance. The working medium M is injected into the heat pipe 33, and the pressure is reduced and sealed. As the working medium M, for example, chlorofluorocarbon, water or the like can be used.

  The heat absorption part 31 is installed in the exhaust pipe 5 through which the exhaust gas G discharged from the engine 2 flows. The heat absorption part 31 is configured by an evaporator or the like that vaporizes the working medium M by heat exchange with the heat of the exhaust gas G flowing through the exhaust pipe 5. The working medium M vaporized in the heat absorbing part 31 is guided to the heat radiating part 32 through the heat pipe 33.

  The heat radiating part 32 is disposed on the cooling water flow path 4. The heat radiating unit 32 condenses the vaporized working medium M by heat exchange with the cooling water W flowing through the cooling water flow path 4 to release the heat of the exhaust gas G collected by the working medium M. The working medium M condensed and liquefied returns to the heat absorption part 31 through the heat pipe 33.

  In addition, although the example using the loop type heat pipe 33 has been described in the example of FIG. 1, the heat pipe 33 may be a tubular pipe sealed at both ends.

In the cooling water flow path 4, the engine 2, the heater core 6, and the heat radiating unit 32 of the heat pipe system 3 are arranged on the flow path.
The heater core 6 warms the air A by heat exchange with the cooling water W. A blower fan 7 is installed adjacent to the heater core 6, and the vehicle interior is heated by introducing the air A warmed by the heater core 6 into the vehicle interior by the blower fan 7.

  The cooling water flow path 4 has a configuration in which a first flow path 41 that passes through the engine 2 and a second flow path 42 that passes through the heater core 6 and the heat radiating unit 32 are separably connected by a four-way valve 43. The four-way valve 43 is moved between a first position shown in FIG. 1 and a second position shown in FIG. 2 by an actuator (not shown).

  As shown in FIG. 1, the four-way valve 43 connects the first flow path 41 and the second flow path 42 at the first position. Thus, the cooling water flow path 4 becomes a single flow path that passes through the engine 2, the heater core 6, and the heat radiating portion 32.

  As shown in FIG. 2, the four-way valve 43 separates the first flow path 41 and the second flow path 42 at the second position, and separates the first flow path 41 and the second flow path 42 from each other. The cooling water W circulation path is used.

  The cooling water channel 4 includes a pump 44 provided in the first channel 41 and a pump 45 provided in the second channel 42. The pump 44 operates both when the first channel 41 and the second channel 42 are connected and separated, and the pump 45 operates only when the first channel 41 and the second channel 42 are separated. To do.

  As shown in FIG. 1, the pump 44 circulates the cooling water W in the direction of the two-dot chain arrow in a single channel connecting the first channel 41 and the second channel 42. The cooling water W is heated by heat exchange with the working medium M of the heat pipe system 3 that has recovered the heat of the exhaust gas G when passing through the heat radiating portion 32, and further when passing through the engine 2, The temperature is raised by heat. The heated cooling water W is guided to the heater core 6 to heat the air A introduced into the passenger compartment by heat exchange.

  As shown in FIG. 2, when separating the first flow path 41 and the second flow path 42, the pump 44 causes the cooling water W of the first flow path 41 to flow in the direction of the dashed line arrow. Since the cooling water W in the first flow path 41 only passes through the engine 2, heat exchange is not performed.

  At the time of separation of the first flow path 41 and the second flow path 42, the pump 45 operates to cause the cooling water W of the second flow path 42 to flow in the direction of the broken line arrow in the figure. The cooling water W circulates between the heat radiating section 32 and the heater core 6, and performs cooling by heat exchange with the working medium M of the heat pipe system 3 and cooling by heat exchange with the air A blown into the vehicle interior. repeat.

  A temperature sensor 46 that measures the temperature of the cooling water W is installed in the vicinity of the heater core 6 in the second flow path 42. The temperature sensor 46 is installed on the outlet side of the heater core 6 in the flow path direction of the cooling water W in the second flow path 42 (in the direction of the broken line arrow) when the first flow path 41 and the second flow path 42 are separated. To do.

  A radiator 8 that cools the cooling water W of the engine 2 by heat exchange with outside air is installed in the vehicle. The radiator 8 and the engine 2 are connected by a cooling water extraction path 81 that extracts cooling water W that passes through the engine 2 and a cooling water recirculation path 82 that recirculates the cooling water W cooled by the radiator 8 to the inside of the engine 2. A thermostat 83 is installed in the cooling water take-out path 81, and is set so that the cooling water take-out path 81 is opened when the temperature of the cooling water W reaches a predetermined temperature. The predetermined temperature can be appropriately set within a range of 80 ° C. to 90 ° C., for example. Although detailed description and illustration are omitted, a branch path for the cooling water W is provided inside the engine 2.

  When the thermostat 83 is opened, a part of the cooling water W flowing through the cooling water flow path 4 is taken out from the cooling water take-out path 81 through the branch path inside the engine 2 and cooled by the radiator 8. The cooled cooling water W is guided to the inside of the engine 2 through the cooling water recirculation path 82 and introduced again into the cooling water flow path 4. The flow rate of the cooling water W introduced into the radiator 8 from the cooling water take-out path 81 is adjusted by the opening degree of the thermostat 83.

The vehicle air conditioner 1 includes a controller 9 that controls the operation of the vehicle air conditioner 1.
The controller 9 includes a CPU, a ROM, a RAM, and the like, and controls various functions of the vehicle air conditioner 1 by reading out a program stored in the ROM.

FIG. 3 is a block diagram showing the configuration of the controller.
As shown in FIG. 3, the controller 9 controls the movement of the position of the four-way valve 43 and the operation of the pumps 44, 45 based on the temperature of the cooling water W measured by the temperature sensor 46. The connection and separation between the first channel 41 and the second channel 42 are switched.

  When starting the engine 2, the controller 9 moves the four-way valve 43 to the second position to separate the first flow path 41 and the second flow path 42 of the cooling water flow path 4 as shown in FIG. To do.

  As described above, the vehicle air conditioner 1 uses the heat of the engine 2 and the heat of the exhaust gas G to heat the passenger compartment, but when the engine 2 is started, the engine 2 is still warmed up. The temperature rise effect of the cooling water W is difficult to obtain from the heat of the engine 2. Moreover, when the cooling water flow path 4 is a single flow path in which the first flow path 41 and the second flow path 42 are connected, the heat capacity of the cooling water W passing through the flow path is also increased. If the heat capacity of the cooling water W is large, the temperature of the cooling water W is difficult to increase, and the heating efficiency inside the vehicle may be reduced. Furthermore, when the engine 2 is started, the heat of the engine 2 is used to raise the temperature of the cooling water W, so that the engine 2 may be prevented from warming up.

  Therefore, when the engine 2 is started, the controller 9 separates the first flow path 41 and the second flow path 42 and further operates the pumps 44 and 45 so that the first flow path 41 and the second flow path are operated. The cooling water W is circulated independently in each of 42.

Since the cooling water W only passes through the engine 2 in the first flow path 41, warming up of the engine 2 is not hindered.
In the second flow path 42, the cooling water W passes through the heat radiating unit 32 and the heater core 6 of the heat pipe system 3. The working medium M vaporized by heat exchange with the exhaust gas G in the heat absorbing part 31 is guided to the heat radiating part 32 of the heat pipe system 3. The temperature of the cooling water W is raised by heat exchange with the working medium M. The heated cooling water W is directly guided to the heater core 6 without passing through the engine 2. In the heater core 6, the cooling water W raises the temperature of the air A blown into the vehicle interior by the blower fan 7 by heat exchange. Thus, the vehicle air conditioner 1 heats the passenger compartment by using only the heat of the exhaust gas G collected by the heat pipe system 3 when the engine 2 is started.

  The capacity of the cooling water W is smaller in the second flow path 42 than in the single flow path connecting the first flow path 41 and the second flow path 42. As the capacity of the cooling water W is reduced, the heat capacity necessary for raising the temperature of the cooling water W is also reduced. Thereby, the temperature of the cooling water W can be quickly raised only by heat exchange with the heat of the exhaust gas G.

  When the heating of the passenger compartment progresses and the temperature of the passenger compartment increases, the amount of heat exchange with the cooling water W in the heater core 6 decreases, so the temperature of the cooling water W on the outlet side of the heater core 6 increases. If the temperature in the passenger compartment is sufficiently increased, there is no possibility of affecting the heating efficiency even if the capacity of the cooling water W is increased. Therefore, the controller 9 moves the four-way valve 43 to the first position when the temperature of the cooling water W measured by the temperature sensor 46 is equal to or higher than a predetermined value, and moves the cooling water flow path 4 to the first flow path 41. And the second flow path 42 is switched to a single flow path. The predetermined value can be appropriately determined within a range of 60 ° C. to 80 ° C., for example.

  The controller 9 further stops the operation of the pump 45 and operates only the pump 44, so that the cooling water W passes through the heat radiating portion 32 and the engine 2 of the heat pipe system 3 as shown in the arrow direction of FIG. After that, it is guided to the heater core 6. Thereby, the heater core 6 can perform heating using both the heat of the exhaust gas G and the heat of the engine 2. Further, if the engine 2 needs to be warmed up, the cooling water W heated by the heat of the exhaust gas G in the heat radiating portion 32 can be used for warming up the engine 2.

  In addition, when the vehicle travels uphill, the heat of the exhaust gas G discharged from the engine 2 may also increase rapidly. When the heat of the exhaust gas G rises, the temperature of the working medium M of the heat pipe system 3 that recovers the heat of the exhaust gas G may also rise. When the temperature of the working medium M rises, the working medium M may be decomposed or the pressure of the working medium M may increase too much. By connecting the first flow path 41 and the second flow path 42 and increasing the heat capacity of the cooling water W, the heat of the exhaust gas G can be efficiently recovered in the heat radiating section 32, and the temperature of the working medium M is increased. It is easy to suppress the rise.

  Further, if the first flow path 41 and the second flow path 42 are connected, the cooling water W is guided from the branch path (not shown) inside the engine 2 to the cooling water take-out path 81 and cooled by the radiator 8. You can also. After cooling with the radiator 8, the cooling water W is reintroduced into the cooling water flow path 4, and heat exchange with the working medium M is performed in the heat radiating unit 32, thereby further improving the heat recovery efficiency of the exhaust gas G. The temperature rise of M can be suppressed.

As described above, the vehicle air conditioner 1 of the embodiment is
(1) A heat pipe system 3 (exhaust gas) having an endothermic portion 31 that absorbs heat of exhaust gas G exhausted by the engine 2 (internal combustion engine) and a heat radiating portion 32 that releases heat of exhaust gas G absorbed by the endothermic portion 31 Heat recovery section),
Cooling water flow path 4 (heat medium flow path) in which cooling water W (heat medium) is circulated and engine 2, heater core 6, and heat radiating portion 32 of heat pipe system 3 are arranged on the flow path,
A first flow path 41 that passes through the internal combustion engine, a second flow path that passes through the heater core 6 and the heat dissipation section 32, from a single flow path that passes through the cooling water flow path 4 through the engine 2, the heater core 6, and the heat dissipation section 32. A four-way valve 43 (switching unit) that switches to two channels of the channel 42,
When the engine 2 is started, the cooling water flow path 4 is switched to two flow paths by the four-way valve 43.

  The heater core 6 heats the interior of the vehicle by heat exchange between the heat of the engine 2 and the cooling water W that has been heated using the heat of the exhaust gas G discharged from the engine 2. However, since the engine 2 is not yet warmed up when the engine 2 is started, the temperature of the cooling water W due to the heat of the engine 2 is not sufficient. Therefore, when the engine 2 is started, the cooling water flow path 4 is switched to two flow paths, and the cooling water W is circulated through the second flow path 42 that passes through the heater core 6 and the heat radiating unit 32, thereby Since the heat capacity is reduced, the temperature of the cooling water W can be quickly raised by the heat of the exhaust gas G of the engine 2, and the heating efficiency can be improved.

(2) The four-way valve 43 detachably connects the first flow path 41 that passes through the engine 2 and the second flow path 42 that passes through the heater core 6 and the heat dissipation part 32.

  By connecting the first flow path 41 and the second flow path 42 so as to be separable by the four-way valve 43, the position of the four-way valve 43 is moved so that the cooling water flow path 4 can Can be easily switched between.

(3) A temperature sensor 46 is provided on the output side of the heater core 6 and measures the temperature of the cooling water W. When the temperature of the cooling water W becomes equal to or higher than a predetermined value, the cooling water channel 4 is separated from the two channels. Switch to a single flow path.

  By switching the cooling water flow path 4 to a single flow path when the interior of the vehicle is heated and the temperature of the cooling water W rises, it is difficult to affect the heating efficiency even if the capacity of the cooling water W increases. Furthermore, by connecting the engine 2, the heater core 6, and the heat radiating portion 32, the heater core 6 can use the heat of the engine 2 in addition to the heat of the exhaust gas G for heating, so that the heating efficiency can be improved.

(4) The heat pipe system 3 circulates the working medium M, the heat absorbing unit 31 vaporizes the working medium M by heat exchange with the exhaust gas G, and the heat radiating unit 32 heats the vaporized working medium M with the cooling water W. It is condensed by exchange,
A radiator 8 that cools the cooling water W by heat exchange with outside air;
A cooling water take-out path 81 and a cooling water recirculation path 82 (heat medium cooling flow path) for taking out the cooling water W passing through the engine 2 and guiding it to the radiator 8 and returning the cooled cooling water W to the engine 2 are provided. Prepare.

  When the temperature of the working medium M of the heat pipe system 3 rises due to an increase in the heat of the exhaust gas G, the working medium M may be decomposed or the pressure of the working medium M may increase excessively. By taking out the cooling water W passing through the engine 2 and cooling it with the radiator 8, the heat recovery efficiency of the exhaust gas G in the heat radiating section 32 of the cooling water W is increased, so that the temperature rise of the working medium M is easily suppressed.

  Hereinafter, modifications of the embodiment will be described. In addition, in a modification, the same code | symbol is attached | subjected about the same structure as embodiment, and detailed description is abbreviate | omitted.

[Modification 1]
In the above-described embodiment, the temperature sensor 46 is installed on the output side of the heater core 6 when the first flow path 41 and the second flow path 42 are separated, and based on the temperature of the cooling water W measured by the temperature sensor 46. Thus, the separation and connection of the first flow path 41 and the second flow path 42 are switched, but the present invention is not limited to this.

FIG. 4 is a schematic configuration diagram of the vehicle air conditioner 1 according to the first modification.
As shown in FIG. 4, the vehicle air conditioner 1 according to Modification 1 includes a pressure sensor 34 installed on the output side of the heat absorbing portion 31 of the heat pipe 33. The pressure sensor 34 measures the pressure of the working medium M vaporized by the heat absorbing unit 31.

  Similarly to the embodiment, when the engine 2 is started, the controller 9 moves the four-way valve 43 to the second position so that the cooling water channel 4 is changed to the first channel 41 and the second channel 42. To separate.

  The controller 9 refers to the output value of the pressure sensor 34, and moves the four-way valve 43 to the first position when the internal pressure of the working medium M becomes a predetermined value or more, The 2nd flow path 42 is connected and the cooling water flow path 4 is made into a single flow path. The predetermined value can be a value indicating a tendency of an abnormal increase in the pressure of the working medium M, and can be, for example, 3 Mpa.

  As described in the embodiment, when the temperature of the working medium M increases due to the increase in the heat of the exhaust gas G, the pressure of the working medium M increases. Therefore, when the pressure of the working medium M exceeds a predetermined value, the first flow path 41 and the second flow path 42 are connected to make the cooling water flow path 4 a single flow path. As a result, similarly to the embodiment, the heat capacity of the cooling water W is increased, the heat exchange between the cooling water W and the working medium M in the heat radiating unit 32 is promoted, and the temperature rise of the working medium M can be suppressed. .

As described above, in the vehicle air conditioner 1 of the first modification,
(5) The heat pipe system 3 circulates the working medium M, the heat absorbing unit 31 vaporizes the working medium M by heat exchange with the exhaust gas G, and the heat radiating unit 32 heats the vaporized working medium M with the cooling water W. It is condensed by exchange,
A pressure sensor 34 that is provided on the output side of the heat absorption part 31 of the heat pipe 33 and measures the pressure of the vaporized working medium M;
When the pressure of the working medium M becomes a predetermined value or more, the cooling water channel 4 is switched from two channels to a single channel.

  When the pressure of the working medium M of the heat pipe system 3 exceeds a predetermined value, the capacity of the cooling water W is increased by switching the cooling water flow path 4 from two flow paths to a single flow path. Heat exchange between M and the cooling water W can be promoted, and an abnormal increase in the pressure of the working medium M can be suppressed to protect the heat pipe system 3.

  Note that the first modification may be combined with the separation of the first flow path 41 and the second flow path 42 based on the measurement value of the temperature sensor 46 in the embodiment and the switching of the connection. That is, when the temperature of the cooling water W measured by the temperature sensor 46 exceeds a predetermined value, or when the pressure of the working medium M measured by the pressure sensor 34 exceeds a predetermined value, the first flow path 41 and the first flow path 41 are changed. Two flow paths 42 may be connected.

[Modification 2]
In the above-described embodiment, the first flow path 41 and the second flow path 42 are connected or separated by the four-way valve 43, so that the cooling water flow path 4 is between the single flow path and the two flow paths. Although it switched, it is not restricted to this.
FIG. 5 is a schematic configuration diagram of the vehicle air conditioner 1 according to the second modification.
As shown in FIG. 5, in the second modification, the engine 2, the heater core 6, and the heat radiating unit 32 are arranged on a single cooling water flow path 400. Then, two parallel bypass passages 401 and 402 connected between the engine 2 and the heater core 6 in the cooling water passage 4 and between the engine 2 and the heat radiating portion 32 are provided. The bypass flow paths 401 and 402 are provided with flow path opening / closing valves 403 and 404, respectively. Further, on-off valves 405 and 406 are provided between the connection points of the two bypass channels 401 and 402 in the cooling water channel 400.

  When the engine 2 is started, the on-off valves 403 and 404 of the bypass passages 401 and 402 are opened, and the on-off valves 405 and 406 of the cooling water passage 400 are closed. Thus, a first flow path that passes only through the engine 2 and a second flow path that passes through the heater core 6 and the heat radiating portion 32 are formed. As in the embodiment, by operating both the pumps 44 and 45, the cooling water W can be made independent of each of the first flow path and the second flow path as indicated by the dashed-dotted arrows in the figure. Circulate. Thereby, similarly to the embodiment, the heat capacity of the cooling water W can be reduced, and the temperature of the cooling water W can be quickly raised by the heat of the exhaust gas G of the engine 2, thereby improving the heating efficiency.

  Similarly to the embodiment, when the temperature of the cooling water W measured by the temperature sensor 46 installed on the output side of the heater core 6 exceeds a predetermined value, the on-off valves 403 and 404 of the bypass flow paths 401 and 402 are closed. Then, the on-off valves 405 and 406 of the cooling water channel 400 are opened, and the operation of the pump 45 is stopped. As a result, the cooling water W flows through the single cooling water flow path 4 as indicated by the dashed arrows in the figure.

  Modification 2 may be applied to Modification 1, and switches between a single flow path and two flow paths based on a measurement value of a pressure sensor 34 provided on the output side of the heat absorbing portion 31 of the heat pipe 33. May be performed.

DESCRIPTION OF SYMBOLS 1 Vehicle air conditioner 2 Engine 3 Heat pipe system 4 Cooling water flow path 5 Exhaust pipe 6 Heater core 7 Blower fan 8 Radiator 9 Controller 31 Heat absorption part 32 Heat radiation part 33 Heat pipe 41 First flow path 42 Second flow path 43 Four-way Valve 44 Pump 45 Pump 46 Temperature sensor 81 Cooling water extraction path 82 Cooling water recirculation path 83 Thermostat 34 Pressure sensor 400 Cooling water path 401, 402 Bypass path 403, 404 On-off valve 405, 406 On-off valve A Air G Exhaust gas W Cooling water M Working medium

Claims (5)

An exhaust heat recovery part comprising an endothermic part that absorbs the heat of the exhaust gas exhausted by the internal combustion engine and a heat dissipation part that releases the heat of the exhaust gas absorbed by the endothermic part;
A heat medium flow path in which a heat medium is circulated, and the internal combustion engine, the heater core, and the heat dissipation section of the exhaust heat recovery section are disposed on the flow path;
A first flow path that passes through the internal combustion engine, a first flow path that passes through the internal combustion engine, and a first flow path that passes through the heater core and the heat dissipation section from a single flow path that passes through the internal combustion engine, the heater core, and the heat dissipation section. A switching unit for switching to two channels of the two channels,
An air conditioner for a vehicle, wherein the heat medium flow path is switched to the two flow paths by the switching unit when the internal combustion engine is started.   The switching unit is a four-way valve that detachably connects a first flow path that passes through the internal combustion engine and a second flow path that passes through the heater core and the heat dissipation part. The vehicle air conditioner according to 1. A temperature sensor provided on the output side of the heater core for measuring the temperature of the heat medium;
The vehicle air conditioner according to claim 1, wherein when the temperature of the heat medium becomes equal to or higher than a predetermined value, the heat medium flow path is switched from the two flow paths to the single flow path. The exhaust heat recovery unit is a heat pipe that circulates a working medium, the heat absorption unit vaporizes the working medium by heat exchange with the exhaust gas, and the heat radiating unit exchanges the vaporized working medium with the heat medium. It is condensed by heat exchange,
A pressure sensor that is provided on the output side of the heat absorption part of the heat pipe and measures the pressure of the vaporized working medium;
The vehicle air conditioner according to claim 1, wherein when the pressure of the working medium becomes a predetermined value or more, the heat medium flow path is switched from the two flow paths to the single flow path. The exhaust heat recovery unit is a heat pipe system that circulates a working medium, the heat absorption unit vaporizes the working medium by heat exchange with the exhaust gas, and the heat dissipation unit converts the vaporized working medium to the heat medium. It is condensed by heat exchange of
A radiator that cools the heat medium by heat exchange with outside air;
The vehicle according to claim 1, further comprising: a heat medium cooling flow path that takes out the heat medium passing through the internal combustion engine, guides the heat medium to the radiator, and returns the cooled heat medium to the internal combustion engine. Air conditioner.

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