JP2002307937A - Heating device for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a heating device for a vehicle preventing water from infiltrating into an intake pipe by providing a drain hole part between an intake port and the intake pipe of a combustor, and opening/closing the drain hole part. SOLUTION: This heating device for the vehicle is provided with the combustor 21 for performing auxiliary heating of the heating device; an intake port 30a opened into an engine room to take in combustion air; an intake pipe 29 enclosed in the combustor 21 to lead the combustion air to a combustion chamber; and an air lead-in passage 30 with one end connected to the intake port 30a and with the other end connected to the intake pipe 29. A first drain chamber 30c having an air passage enlarged in cross-sectional area is provided in the air lead-in passage 30 and disposed so that water infiltrating from the intake port 30a is drained in the first drain chamber 30c to prevent water from infiltrating into the intake pipe 29.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating system for a vehicle, in which a hot water heater using cooling water of a water-cooled engine and a combustor for burning fuel are used in parallel. The present invention relates to a structure of an air introduction passage for taking in air.

[0002]

2. Description of the Related Art Generally, in a vehicle heating apparatus equipped with a water-cooled engine, a vehicle interior is heated by using waste heat absorbed by cooling water as a heat source. Therefore, when the cooling water temperature is low and sufficient heating capacity cannot be obtained, such as at the time of a so-called cold start, such as immediately after the start of a water-cooled engine, it is particularly useful as a vehicle heating device that operates a combustor to supplement the heating capacity. The thing shown in Unexamined-Japanese-Patent No. 11-348541 is known. In this publication, a water-cooled engine for driving a vehicle, a heater core (hot water heater) for heating the vehicle interior by heating air blown into the vehicle interior using cooling water of the engine as a heat source, and an upstream side of the heater core A combustor is provided to heat the cooling water flowing into the heater core.

Further, the combustor is installed in an engine room, and exhaust gas from the combustor is combined with an exhaust gas discharge destination of a water-cooled engine and discharged into the atmosphere via an exhaust purification catalyst and a muffler provided in the vehicle. It has become so. By operating this combustor, the cooling water is quickly heated, thereby shortening the warm-up operation of the engine and improving the heating capacity of the vehicle interior to achieve comfort.

Further, the above-described combustor heats the cooling water flowing into the heater core, but there is also known a combustor which heats the air in order to increase the blowing temperature of the heater core. As this type of heating device, there is one described in Japanese Patent Publication No. 7-5014. In this publication, a heater core (hot water heater) for heating the vehicle interior by heating air blown into the vehicle interior using cooling water as a heat source, and an air conditioner incorporating the heater core are installed in the vehicle interior, and an engine room is provided. Some air (warm air) heated by a combustor installed in the air conditioner is supplied to a downstream portion of a heater core through a hot air heating air passage to increase a blowing temperature to improve heating capacity and immediately effect heating.

[0005]

The combustor is provided with an intake pipe for taking in combustion air and an exhaust pipe for discharging combustion exhaust. For the connection destination of the exhaust pipe,
As described in the former publication, a method of merging with a catalyst and a muffler of an exhaust gas system of a water-cooled engine provided on a vehicle side and discharging the combined gas to the atmosphere is becoming mainstream.

However, although the intake pipe is not described in both publications, it is generally connected to an intake pipe of a combustor via an intake duct from an intake port which opens in a position where the temperature does not become high in the engine room. Is what it is. Also,
The location that is not affected by the temperature in the engine room is generally optimal on the upstream side of the vehicle where the air outside the vehicle compartment always flows. However, if an intake port is provided in this portion, there is a problem that water enters the intake duct and sucks water from the intake pipe of the combustor.

[0007] Further, the combustion blower is of a high pressure type for taking in combustion air from an intake port and discharging combustion exhaust gas burned in a combustion chamber of the combustor to the atmosphere via the above-mentioned catalyst and muffler. I have. Therefore,
Water that jumps into the vicinity of the air inlet is easily sucked in with the air. Therefore, measures such as installing the intake duct below the intake pipe of the combustor and providing a drain hole to drain the water that entered the lowest point among them were taken. When the opening area of the water drain hole increases, high temperature air is sucked in, and the hole cannot be made large.On the contrary, the hole with a small diameter becomes clogged with dust or the like over time. There is a problem.

In view of the above, it is an object of the present invention to provide a drain hole between an intake port and an intake pipe of a combustor, and to open and close the drain hole to open the intake pipe. It is an object of the present invention to provide a vehicular heating device in which water does not enter the vehicle.

[0009]

In order to achieve the above object, the technical means described in claims 1 to 12 is adopted. That is, according to the first aspect of the present invention, a combustor (21) mounted in the engine room of the vehicle to perform auxiliary heating of the heating device, and an intake port (30a) opened in the engine room to take in combustion air. An intake pipe (29) housed in a combustor (21) for guiding combustion air to a combustion chamber
An air introduction passage (30) having one end connected to the intake port (30a) and the other end connected to the intake pipe (29); and increasing the cross-sectional area of the air passage in the air introduction passage (30) to increase the air flow rate. And a first drain chamber (30c) for lowering the air pressure. In the first drain chamber (30c), both are separated from the mixed state of the combustion air and water introduced from the intake port (30a), The separated water is drained into the first drain chamber (30c).
It is characterized by being configured to drain outside.

According to the first aspect of the present invention, the intake port (30
By forming an air introduction passage (30) provided between a) and an intake pipe (29) and having a first drainage chamber (30c) for increasing the cross-sectional area of the air passage and decreasing the air flow velocity, the intake port is provided. Even if water is mixed in the combustion air taken in from (30a), the flow rate is reduced in the first drainage chamber (30c) having a larger cross-sectional area to separate the combustion air and water, and the water is drained. Water can be prevented from entering the intake pipe (29). As a result, the life of the device of the combustor (21) can be extended and the deterioration of the combustion state can be prevented.

According to the second aspect of the present invention, the air introduction passage (3)
0) is the first drain chamber (30c) from the intake port (30a).
A first air passage (30b) leading to the first drainage chamber (30c), and a first drainage chamber (30c).
9) and a second air passage (30d) leading to
The first drain chamber (30c) is characterized in that it is located at the lowest position in the air introduction passage (30).

According to the second aspect of the present invention, the first air passage (30b), the first drain chamber (30c),
It is divided into a second air passage (30d), in which the first drainage chamber (30c) is located at the lowest position, whereby the first
Water can be drained without fail in the drain chamber (30c).

According to the third aspect of the present invention, the first drain chamber (30
c) is characterized in that a drain hole (31) having a check valve structure is formed at the bottom of the first drain chamber (30c).

According to the third aspect of the present invention, the drain hole (31) having a check valve structure is formed at the bottom of the first drain chamber (30c). By forming the drain hole (31) having a valve that closes (31) and opens when a predetermined amount of water accumulates, intrusion of water from the outside from the drain hole (31) is eliminated.

According to the fourth and fifth aspects of the present invention, the downstream end of the first air passage (30b) is disposed downward in the first drain chamber (30c), and the second air Passage (3
0d) is characterized in that the upstream end is disposed above the downstream end of the first air passage (30b) arranged in the first drain chamber (30c).

According to the fourth and fifth aspects of the present invention, the downstream end of the first air passage (30b) is connected to the first drain chamber (30c).
To the second air passage (30
By arranging the upstream end of d) above the downstream end of the first air passage (30b), it is easy for water to enter below the first drain chamber (30c), and the second air passage is provided. (3
0d), by making it difficult to come out of the upstream end.
There is no water infiltration into 9).

According to the sixth aspect of the present invention, the combustor (2) is mounted in the engine room of the vehicle and performs auxiliary heating of the heating device.
1), an intake port (30a) opened in the engine room to take in combustion air, an intake pipe (29) housed in the combustor (21) and guiding the combustion air to the combustion chamber. The other end is connected to the intake port (30a) and the intake pipe (29)
And an air inlet passage (30) connected to the air inlet passage (30).
a) a drain hole (31) for draining water entering from a) to the outside of the air introduction passage (30); and a first opening / closing member (32) for opening and closing the drain hole (31). The opening / closing member (32) closes the drain hole (31) when the inside of the air introduction passage (30) is at a negative pressure with respect to the outside of the air introduction passage (30). It is characterized in that it is configured to drain water that has entered from 3a).

According to a sixth aspect of the present invention, the second drain chamber (3c) is reduced in size, and a drain hole (31) is formed in the air introduction passage (30). A first opening / closing member (32) that opens and closes the drain hole (31), and is configured so as to close the drain hole (31) when a negative pressure is applied. During operation, the inside of the air introduction passage (30) has a negative pressure. At this time, water does not enter from the outside through the drain hole (31), and there is no suction of high-temperature air.

Further, since water is drained at times other than the negative pressure, water that has entered through the inlet (3a) can be drained when the combustor (21) stops.

In the invention according to claim 7, the first opening / closing member (3
2) has a check valve structure that closes the drain hole (31) when the pressure inside the air introduction passage (30) is negative with respect to the outside of the air introduction passage (30). Even if the water accumulated in the drain hole (31) exceeds a predetermined amount, the water is drained from the drain hole (31).

According to the invention of claim 7, specifically, by providing the first opening / closing member (32) having a check valve structure,
Water that has intruded from the suction port (3a) can be stored around the drain hole (31), and when the amount exceeds a predetermined amount, the combustor (21) is activated by the relationship between the gravity of the water and the negative pressure. Even during operation, water can be drained from the drain hole (31), so that water can be prevented from entering the intake pipe (29).

According to the eighth aspect of the present invention, the first opening / closing member (3
2) is housed in a second drainage chamber (34) having a drainage part (33) for draining water that has entered through the inlet (3a), and the inside of the air introduction passage (30) is filled with the air introduction passage (3).
0) Even when the pressure is outside negative pressure, the drainage section (3
Water from the outside that has entered from 3) is discharged to the second drain chamber (34).
The drain hole (31) is closed when the inside is filled.

According to the invention of claim 8, the drain holes (3
The first opening / closing member (32) for opening and closing 1) is connected to the drainage section (33).
Is housed in a second drain chamber (34) having a water drain hole (31) when the second drain chamber (34) is filled.
Is closed, for example, a drain hole (31) is provided on the lower side in the engine room, and even if the drainage part (33) is supposed to be flooded by the vehicle depending on the running conditions of the vehicle, Water from the outside can be prevented from entering the intake pipe (29) through the drain hole (31). As a result, damage to combustion parts in the combustor (21) can be prevented.

The capacity of the second drain chamber (34) can be made smaller than that of the first drain chamber (30c) according to the first aspect of the present invention, so that the second drain chamber (34) can be mounted in a narrow engine room. improves.

According to the ninth aspect of the present invention, the first opening / closing member (3
2) is characterized by being formed of a floating material having a specific gravity smaller than that of water.

According to the ninth aspect of the present invention, the first opening / closing member (32) is opened / closed using, for example, a float into which air is mixed, so that the air introduction passage (30) is opened. It can be closed when the inside is at a negative pressure, and can be closed when the inside of the second drain chamber (34) is flooded and filled with water from the outside. This makes it possible to prevent water from entering the intake pipe (29).

According to the tenth aspect of the present invention, a combustor (21) mounted in the engine room of the vehicle for performing auxiliary heating of the heating device, and an intake port (30a) opened in the engine room to take in combustion air. And an intake pipe (29) housed in the combustor (21) and guiding the combustion air to the combustion chamber.
An air inlet passage (30) having one end connected to the air inlet (30a) and the other end connected to the air inlet pipe (29); and an air inlet passage (30) formed at the lowest part of the air inlet passage (30). A drain hole (31) for draining water entering from the air inlet passage (30) from the air inlet passage (30);
A third drainage chamber (35) communicating with 1), the third drainage chamber (35) having a drainage part (33) for draining water that has entered through the inlet (3a) to the outside, Air introduction passage (3
0) It is formed so as to increase the ventilation resistance sucked from the drain portion (33) when the inside is at a negative pressure with respect to the outside of the air introduction passage (30), and from the suction port (3a) when the pressure is other than the negative pressure. A shielding member (3) formed so that invading water can be easily drained.
6).

According to the tenth aspect of the present invention, the drain hole (31) and the drain hole (3) are formed in the air introduction passage (30).
A third drainage chamber (35) communicating with 1), and a shielding member (36) formed to increase ventilation resistance sucked from the drainage section (33) when negative pressure is applied. When a negative pressure is applied to the inside of the air introduction passage (30), water from the outside hardly enters through the drain hole (31), and there is no suction of high-temperature air.

Further, by having a shielding member (36) formed so as to drain water at a time other than the negative pressure, when the combustor (21) stops, water entering through the suction port (3a) is provided. Can drain.

According to the eleventh and twelfth aspects of the present invention,
A combustor (21) mounted in the engine room of the vehicle to perform auxiliary heating of the heating device, an intake port (30a) opened in the engine room to take in combustion air, and housed in the combustor (21) An intake pipe (29) for guiding combustion air to the combustion chamber, and an air introduction passage (30) having one end connected to the intake port (30a) and the other end connected to the intake pipe (29).
A drain hole (31) formed at the lowest part of the air introduction passage (30) and draining water entering through the air inlet (30 a) to the outside of the air introduction passage (30); A second opening / closing member (37) for opening and closing the hole (31);
The second opening / closing member (37) has a drainage part (33) for draining water that has entered through the suction port (3a) to the outside.
3) when the drainage part (33) is deformed by the buoyancy of water to close the drainage hole part (31) when the water is flooded, and the second opening / closing member (37) is provided with a drainage part. (3
3) A floating member (37a) formed of a floating material having a specific gravity smaller than that of water is provided in the vicinity, and when the drainage portion (33) is flooded, the drainage portion (33) is deformed by the buoyancy of the water to form the water. It is characterized in that the hole (31) is closed.

According to the eleventh and twelfth aspects of the present invention, as described in the eighth and ninth aspects, in the present invention, the drainage part (33) may be temporarily immersed in the vehicle depending on the running conditions of the vehicle. Even when the drain hole (3
From 1), water from the outside can be prevented from entering the intake pipe (29).

Note that the reference numerals in parentheses of the above means indicate the correspondence with specific means described in the embodiment described later.

[0033]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) A first embodiment of the present invention will be described below with reference to FIGS. First, FIG. 1 is a schematic diagram of a vehicle heating device according to the present embodiment, 10 is a water-cooled engine (liquid-cooled internal combustion engine) for running the vehicle, and 11 is a water-cooled engine (hereinafter abbreviated as engine). )) To collect the exhaust gas discharged from each cylinder,
This is an exhaust pipe leading to a catalyst 12 described later. Reference numeral 12 denotes a three-way catalyst (hereinafter, abbreviated as a catalyst) that purifies exhaust gas by promoting an oxidation-reduction reaction such as hydrocarbon or nitrogen oxidation in the exhaust gas.
On the downstream side of the exhaust flow of the catalyst 12, the catalyst 12
A muffler 13 (muffler) 13 for reducing noise (exhaust sound) of exhaust gas flowing out of the vehicle is provided.

A radiator 14 cools cooling water (coolant) circulating in the engine 10, and a water pump 15 circulates cooling water by obtaining a driving force from the engine 10. Reference numeral 16 denotes a bypass passage for returning the cooling water flowing out of the engine 10 to the engine 10 by bypassing the radiator 14, and 17 for flowing the cooling water flowing out of the engine 10 to the radiator 14 according to the cooling water temperature. , A well-known thermostat that switches between a case in which the gas flows through the bypass passage 16. Incidentally, the water pump 15 and the bypass passage 16 are usually built in the engine 10.

Numeral 20 denotes a heater core for heating the vehicle interior by heating the air blown into the vehicle interior using the cooling water as a heat source. Reference numeral 21 denotes a heater core disposed upstream of the heater core 20 and flowing into the heater core 20. It is a combustor that heats the cooling water. The combustion state of the combustor 21 (stopped or the calorific value of the combustor 21), a fuel pump (F / P) 22 for pumping fuel to the combustor 21, and an electric water pump 23 are provided by a timer switch (operated by an occupant). It is controlled by an electronic control unit (ECU) 24 based on set values of a remote control device (not shown) or the like.

Incidentally, 24a is a water temperature sensor (temperature detecting means) for detecting the temperature of the cooling water flowing out of the engine 10.
And the detection signal (detection temperature) of the water temperature sensor 24a is E
It has been input to the CU 24. 25 is the engine 10
The cooling water discharged from the electric water pump 23 flows through the bypass passage 25 through the bypass passage 25 and is electrically connected to the bypass passage 25. Check valve 26 for preventing return to the suction side of water pump 23
Are arranged.

Reference numeral 27 denotes a combustion blower that blows combustion air into the combustion chamber of the combustor 21. In this embodiment, a volume-type blower (air pump) is employed and is built in the combustor 21. Reference numeral 28 denotes an exhaust duct (exhaust pipe) for guiding the exhaust gas discharged from the combustor 21 to the catalyst 12.
1 connected.

Reference numeral 29 denotes an intake pipe arranged on the suction side of the combustion blower 27. The inlet side of the intake pipe 29 has an intake port for taking in combustion air, as shown in FIGS. It is connected to the end of the air introduction passage 30 having the port 30a. The air introduction passage 30 includes a first intake duct 30b, a first drainage chamber 30c, and a second intake duct 30d.
The first intake duct 30b has an intake port 30a at an upstream end thereof.

The intake port 30a is installed at the front side of the vehicle in which the air outside the vehicle compartment, which is relatively unaffected by the temperature in the engine room, always flows through the first intake duct 30b.
As shown in FIG. 2B, the downstream end of the first intake duct 30b is disposed so as to face downward in the first drainage chamber 30c. When water enters the intake port 30a due to rainfall or the like, even if air and water are mixed and sucked by the suction pressure of the combustion blower 27, the water and the air enter the lower part of the first drainage chamber 30c. It is like that.

Next, the first drainage chamber 30c side is
0a, the combustor 21 and the first and second intake ducts 30b,
It is installed below the vehicle (lowest part) than 30d,
The cross-sectional area of the air duct of the intake duct 30b is made larger than that of the air passage so that the velocity of the combustion air is greatly reduced. In this portion, the air and water are separated, the water is temporarily stored at the bottom, and then drained. A drain hole 31 is formed at the bottom of the first drain chamber 30c, and only water is drained from the drain hole 31.

The drain hole 31 is formed in an annular shape by, for example, a molded article made of rubber or the like.
The protrusion having a U-shape is formed toward the outside of the first drainage chamber 30c, and a drain hole 3 is formed at the tip of the protrusion.
1a is formed. As a result, when water accumulates inside the protrusion having a substantially V-shaped cross section and accumulates in a predetermined capacity, the water is drained to the outside from the drain hole 31a by its own weight or vibration. In addition, it has a check valve structure that prevents intrusion of water from outside through the drain hole 31a.

Next, the second intake duct 30d has a downstream end connected to the intake pipe 29, and an upstream end connected to the downstream end of the first intake duct 30b disposed in the first drainage chamber 30c. By being arranged at a position above the section, it is configured to store moisture below the first drainage chamber 30c and suck in only air.

The operation of this embodiment having the above configuration will be described. First, during a warm-up operation or a heating operation when the engine 10 is stopped, the fuel pump 22, the electric water pump 23, and the blower 27 are operated by a signal from a timer switch or a remote control device, and the combustor 21 is ignited (operated). ).

As a result, the cooling water heated by the combustor 21 circulates through the heater core 20 and the engine 10, so that the vehicle interior is heated and the engine 10 is warmed (warmed up). On the other hand, the exhaust gas of the combustor 21
The catalyst 12 flows through the exhaust duct 28 and is guided to the catalyst 12.
After being purified by the muffler 13, the noise is reduced by the muffler 13 and then released into the atmosphere.

Next, during the heating operation while the engine 10 is operating, the electric water pump 23 is stopped because the water pump 15 starts operating when the engine 10 is started. Then, the combustion state of the combustor 21 is controlled according to the cooling water temperature (the temperature detected by the water temperature sensor 24a) TW. Specifically, the cooling water temperature TW is a predetermined temperature (for example, 8
0 ° C.) or more, the combustor 21 is stopped, and when the cooling water temperature TW is lower than the predetermined temperature T, the cooling water temperature TW
The combustor 21 and the like are controlled so as to increase the amount of heat generated by the combustor 21 in accordance with the decrease in the temperature.

Here, when the combustor 21 performs combustion, the combustion blower 27 is operated to take in combustion air from the intake port 30a and blow the combustion air into the combustion chamber to continue combustion. For example, when water splashes near the intake port 30a due to rainfall, splashing, or the like, a mixed air of air and water is sucked in the first intake duct 30b by the suction pressure of the combustion blower 27. However, the first drainage chamber 30c on the downstream side of the first intake duct 30b lowers the air flow velocity, the water flows downward, and the air and water are separated, and only the air is taken in via the second intake duct 30d. It is sucked into the pipe 29. This prevents water from being sent into the combustion chamber.

According to the first embodiment, the cross-sectional area of the air passage is increased in the air introduction passage 30 between the intake port 30a for taking in the combustion air and the intake pipe 29 built in the combustor 21. By providing one drainage chamber 30c,
Even if water is mixed in the combustion air taken in from the intake port 30a, the water can be prevented from entering the intake pipe 29 by reducing the flow velocity in the first drainage chamber 30c and separating the combustion air and water. As a result, the life of the equipment housed in the intake system of the combustor 21 can be extended, and the deterioration of the combustion state of the fuel in the combustion chamber can be prevented.

The first drain chamber 30c is connected to the air introduction passage 3
By arranging at the lowermost part in 0, water can be always received and drained in the first drainage chamber 30c.

Further, by forming a drainage hole 31 having a check valve structure at the bottom of the first drainage chamber 30c, for example, a small amount of water allows the drainage hole 31 to close and open when a predetermined amount of water accumulates. By forming the drain hole 31, the first drain chamber 30
No water permeates from the outside of c through the drain hole 31a. Further, the air having a higher temperature than that of the drain hole 31a is not sucked.

The downstream end of the first intake duct 30b is arranged downward with respect to the first drain chamber 30c, and the upstream end of the second intake duct 30d is connected to the first intake duct 3d.
0b is disposed above the downstream end of the
By making it easy for water to enter under the drainage chamber 30c and not to come out from the upstream end of the second intake duct 30d, the intake pipe 29
There is no water intrusion into the water.

(Second Embodiment) In the first embodiment described above, by providing the first drainage chamber 30c having a reduced flow velocity in the air introduction passage 30, water or combustion air entering from the intake pipe 30a is provided. Separates the water contained in the intake pipe 29
In order to reduce the size of the air introduction passage 30 including the first drain chamber 30c having a large cross-sectional area of the air passage, A drain hole 31 is provided in the air introduction passage 30,
The drain hole 31 may be opened and closed by an open / close member having a check valve structure so that water does not enter the intake pipe 29.

As shown in FIGS. 3 (a) and 3 (b), a drain hole 31 is formed in the lower surface of the lowermost part of the air introduction passage 30 formed in a cylindrical shape. An opening / closing member 32 formed by a concave portion 32a and a protruding portion 32b is provided on the outer peripheral side. The opening and closing member 32 is
The air introduction passage 30 is formed of a nonmetallic material such as a rubber material.
The protrusions 32b are arranged in the air introduction passage 30 by engaging the protruding portions 32b with the mounting holes 32c formed in the holes.

The air introduction passage 30 having the opening / closing member 32 and the drain hole 31 is such that when the inside of the air introduction passage 30 is under a negative pressure, the concave portion 32a of the opening / closing member 32 is formed on the outer peripheral surface of the air introduction passage 30. The water drain hole 31
When the pressure is other than the negative pressure, the water drain hole 31 is engaged so as to be opened as shown in FIG.

The drain hole 31 is configured so that water entering from the intake port 3a is stored around the drain hole 31. By appropriately setting the size of the drain hole 31, the air introduction passage 30 is formed. Even when the inside is under a negative pressure with respect to the outside of the air introduction passage 30, when water exceeding a predetermined amount accumulates, the opening / closing member 32 is opened so that the drain hole 31 is opened.

According to the embodiment having the above-described configuration, when the combustor 21 is operating, the inside of the air introduction passage 30 becomes a negative pressure with respect to the outside of the air introduction passage 30 so that the drain holes 31 are formed.
Is closed, so that water from the outside does not enter from the drain hole 31 and there is no suction of hot air.

Further, since water is drained at times other than the negative pressure, when the combustion machine 21 stops,
The water that has entered through the inlet 3a can be drained. However, by setting the opening / closing member 32 to a check valve structure and appropriately setting the size of the drain hole 31, even if the inside of the air introduction passage 30 is under a negative pressure with respect to the outside of the air introduction passage 30, the drain hole 31 is formed. Even when water exceeding a predetermined amount accumulates in the periphery, drainage can be performed from the drain hole 31. Therefore, water is not sucked into the intake pipe 29.

(Third Embodiment) In the second embodiment described above, a drain hole 31 is provided at the lowest part of the air introduction passage 30, and a first opening / closing member 32 for opening and closing the drain hole 31 is provided. Although the drainage hole 31 is closed when the pressure in the introduction passage 30 is negative, and the water that has entered from the suction port 3a is drained when the pressure is not negative, the present invention is not limited to this. The drain hole 31 may be opened and closed using an opening / closing member formed of a floating material having a smaller specific gravity than water. FIG.
As shown in (a) to (c), for example, a first opening / closing member 32 formed of a floating material lighter than water by enclosing air thereinto is drained to drain water that has entered from a suction port 3a at the bottom. It has a portion 33 and is configured to be housed in a second drainage chamber 34 that communicates with a drainage hole 31 provided at the lowest part of the air introduction passage 30.

Thus, when the pressure in the air introduction passage 30 is negative, as shown in FIG. 4B, the first opening / closing member 32 is sucked into the drain hole 31 to close the drain hole 31, and A check valve structure is provided so that the drain hole 31 is opened when pressure is not applied. Also, the drain hole 31 has an intake port 3 around it.
a is configured such that the water that has entered from the inside of the air introduction passage 30 is set to a predetermined amount even when the inside of the air introduction passage 30 is under a negative pressure with respect to the outside of the air introduction passage 30 by appropriately setting the size of the drain hole 31. The first opening / closing member 32 is opened so that the water drain hole 31 is opened when the water that has exceeded the threshold is accumulated.

Further, for example, a drain hole 31 is provided below the engine room, and when the drainage portion 33 is supposed to be flooded depending on the running conditions of the vehicle, as shown in FIG. Even if the invading water enters the second drain chamber 34 from the drainage part 33, the first opening / closing member 32 rises with the water surface and closes the drain hole 31.

According to the third embodiment having the above configuration,
In addition to the effects described in the second embodiment, the first opening / closing member 32 closes the drainage hole 31 even when the drainage portion 33 is positioned below the vehicle and the drainage portion 33 is flooded. In addition, external water is not sucked into the intake pipe 29 from the drain hole 31. Accordingly, damage to the combustion components in the combustor 21 can be prevented.

Further, since the volume of the second drain chamber 34 can be made smaller than that of the first drain chamber 30c described in the first embodiment, the mountability in a narrow engine room is improved. .

(Fourth Embodiment) In the above embodiments, when the pressure in the air introduction passage 30 is negative,
1 is closed, but the invention is not limited to this. In addition to increasing the ventilation resistance of the path sucked from the drainage section 33 at the time of negative pressure, the apparatus is configured to discharge water that has entered through the intake port 3a. Is also good.

As shown in FIG. 5, a drainage portion 33 which communicates with a drainage hole 31 provided at the lowermost portion of the air introduction passage 30 and discharges water which has entered from the intake port 3a at the bottom portion, and a plurality of shielding members. And a third drainage chamber 35 having the same. The shielding member 36 is provided with a drainage portion 36a through which water that has entered from the intake port 3a drains downward by its own weight. By having a plurality of shielding members 36, the drainage part 3
By increasing the ventilation resistance of the path taken in from the drain 3, external water can be drained from the drain port 33 at the time of negative pressure.
1 is configured to prevent suction.

As a result, the water that has entered through the intake port 3a is easily drained, and external water is unlikely to enter the intake pipe 29 through the drain port 33 when there is a negative pressure, and there is no suction of high-temperature air.

(Fifth Embodiment) In the third embodiment, the first opening / closing member 32 formed of a floating material is accommodated in the second drainage chamber 34, and the position of the drainage portion 33 is set to the lower side of the vehicle. If the drainage part 33 is flooded when it is located,
1 is configured so as to prevent external water from being sucked into the intake pipe 29. However, a floating material is provided in the drain 33, and the drain 3
A configuration may be made so that external water does not enter from the drainage section 33 when the 3 is flooded.

As shown in FIG. 6 (a), the suction port 3 is provided at one end.
a floating member 37a formed of a floating material having a specific gravity smaller than that of water is disposed in the vicinity of the drainage portion 33, and the other end thereof is connected to the air introduction passage 30. Is provided with a second opening / closing member 37 connected to the drain hole 31 provided at the lowermost part of the second opening / closing member. In the middle of the second opening / closing member 37, for example, a bent portion 37b is formed so as to be bent at this portion.

For example, when a drain hole 31 is provided on the lower side in the engine room, and the drainage part 33 is supposed to be flooded depending on the running conditions of the vehicle, as shown in FIG. The opening / closing member 37 is bent at the bent portion 37b, and the float member 37a floats the drainage portion 33 on the water surface so as to prevent external water from entering the drainage portion 33.

Thus, even if the position of the drainage portion 33 is located below the vehicle and the drainage portion 33 is flooded, the second opening / closing member 37 closes the drainage hole 31.
External water is not sucked into the intake pipe 29 from the drain hole 31.

(Other Embodiments) In the first embodiment, the structure of the drain hole 31 is described as being formed as a check valve structure by projecting with a substantially V-shaped cross section. However, the present invention is not limited to this. As shown, a drain hole 31b is formed at the bottom of the first drain chamber 30c. The structure of this drain hole 31b is the first drainage chamber 3
It may be formed in a small-diameter opening shape tapered toward the outside of 0c. As a result, when the combustion blower 27 is operating, a little water enters from the outside, but the intake pipe 2 extends until water accumulates up to the position of the suction port of the second intake duct 31d.
No water enters the 9.

Further, in the above embodiment, the combustion device 2 for heating the cooling water flowing to the heater core 20 for heating the vehicle interior is used.
Although the first embodiment has been described, the present invention is not limited to this, and it is needless to say that the present invention is also applied to a hot air type combustor that blows hot air into a vehicle compartment by heating air.

[Brief description of the drawings]

FIG. 1 is a schematic diagram illustrating an overall configuration of a vehicle heating device according to a first embodiment of the present invention.

FIGS. 2A and 2B are explanatory views showing the entire configuration of an air introduction passage 30 in the first embodiment of the present invention, and FIG. 2B is a longitudinal sectional view showing the entire configuration of a first drainage chamber 30c.

FIG. 3A is an explanatory view showing a configuration of a first opening / closing member 32 in an air introduction passage 30 in a second embodiment of the present invention;
(B) is an overall configuration diagram of a portion A shown in (a).

FIGS. 4A and 4B are explanatory diagrams showing an entire configuration of a first opening / closing member 32, FIG. 4B is an explanatory diagram showing a position when the first opening / closing member 32 is under a negative pressure, and FIG. (C) is an explanatory view when the drainage section 33 is flooded.

FIG. 5 is a third drainage chamber 3 according to a fourth embodiment of the present invention.
FIG. 5 is a longitudinal sectional view showing an overall configuration of a fifth embodiment.

FIG. 6A is a longitudinal sectional view showing the entire configuration of a second opening / closing member 37 in a fifth embodiment of the present invention, and FIG. 6B is an explanatory diagram when the drainage section 33 is flooded.

FIG. 7 is a longitudinal sectional view showing the entire configuration of a drainage chamber 30c according to another embodiment.

[Explanation of symbols]

 Reference Signs List 21 combustor 29 intake pipe 30 air introduction passage 30a intake port 30b first intake duct (first air passage) 30c first drain chamber 30d second intake duct (second air passage) 31: drain hole (drain hole) 32: first opening / closing member 33: drainage part 34: second drain chamber 35: third drain chamber 36: shielding member 37: second opening / closing member 37a: float member ( Floating member)

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Satoshi Yamanashi 1-1-1, Showa-cho, Kariya-shi, Aichi Prefecture Inside Denso Corporation (72) Inventor Hirotaka Egami 1-1-1, Showa-cho, Kariya-shi, Aichi Prefecture Denso Corporation (72) Inventor Takatoshi Inakoshi 1-1-1, Showa-cho, Kariya-shi, Aichi Prefecture Inside DENSO Corporation

Claims (12)

[Claims] A combustion unit mounted in an engine room of a vehicle to perform auxiliary heating of a heating device; an intake port opened in the engine room to take in combustion air; An intake pipe (29) housed in the machine (21) for guiding combustion air to the combustion chamber; an air introduction passage having one end connected to the intake port (30a) and the other end connected to the intake pipe (29). (30), and a first drainage chamber (30c) for increasing the cross-sectional area of the air passage and reducing the air flow velocity in the air introduction passage (30). In the first drainage chamber (30c), , The intake port (3
0a) for separating the combustion air and water from the mixed state taken in from 0a) and draining the separated water out of the first drain chamber (30c). Heating system. 2. The air introduction passage (30) includes a first air passage (30b) leading from the intake port (30a) to the first drain chamber (30c), and a first drain chamber (30).
c) and a second air passage (30d) leading from the first drain chamber (30c) to the intake pipe (29), and the first drain chamber (30c) is connected to the air introduction passage (30). The vehicular heating apparatus according to claim 1, wherein the vehicular heating apparatus is located at the lowest position in (30). 3. A drain hole (31) having a check valve structure is formed in the first drain chamber (30c) at the bottom of the first drain chamber (30c). The heating device for a vehicle according to claim 1 or 2. 4. The vehicle according to claim 2, wherein a downstream end of the first air passage (30b) is disposed downward in the first drain chamber (30c). For heating system. 5. An upstream end of the second air passage (30d) is connected to a downstream end of the first air passage (30b) disposed in the first drain chamber (30c). The heating device for a vehicle according to claim 2, wherein the heating device is disposed above the heating device. 6. A combustor (21) mounted in an engine room of a vehicle to perform auxiliary heating of a heating device; an intake port (30a) opened in the engine room to take in combustion air; An intake pipe (29) housed in the machine (21) for guiding combustion air to the combustion chamber; an air introduction passage having one end connected to the intake port (30a) and the other end connected to the intake pipe (29). (30), a drain hole (31) formed at the lowest part of the air introduction passage (30) and draining water that has entered through the air inlet (30a) out of the air introduction passage (30). ), And a first opening / closing member (3) for opening and closing the drain hole (31).
2), wherein the first opening / closing member (32) is provided with the air introduction passage (3).
0) Closes the drain hole (31) when the inside is at a negative pressure with respect to the outside of the air introduction passage (30), and drains water that has entered from the suction port (3a) when the pressure is other than negative. A heating device for a vehicle, comprising: 7. The first opening / closing member (32) closes the drain hole (31) when the inside of the air introduction passage (30) has a negative pressure with respect to the outside of the air introduction passage (30). A check valve structure that drains water from the drain hole (31) when the amount of water accumulated in the drain hole (31) exceeds a predetermined amount, even under negative pressure. The heating device for a vehicle according to claim 6, wherein the heating is performed. 8. The first opening / closing member (32) is accommodated in a second drainage chamber (34) having a drainage part (33) for draining water that has entered from the suction port (3a), and is provided with the air. Even when the inside of the introduction passage (30) is at a pressure other than the negative pressure with respect to the outside of the air introduction passage (30), water from the outside that has entered through the drainage section (33) is discharged from the second drain chamber (34). The heating device for a vehicle according to claim 6, wherein the drain hole (31) is closed when the inside is filled. 9. The vehicle heating device according to claim 7, wherein the first opening / closing member (32) is formed of a floating material having a specific gravity smaller than that of water. 10. A vehicle mounted in an engine room of a vehicle,
A combustor (21) that performs auxiliary heating of a heating device; an intake port (30a) that is opened in the engine room to take in combustion air; and is housed in the combustor (21) and burns combustion air. An intake pipe (29) leading to the chamber; an air introduction passage (30) having one end connected to the intake port (30a) and the other end connected to the intake pipe (29); And a drain hole (31) for draining water that has entered through the air inlet (30a) out of the air introduction passage (30), and communicates with the drain hole (31). The third drainage room (3
5), the third drainage chamber (35) has a drainage part (33) for draining water intruding from the suction port (3a) to the outside, and the inside of the air introduction passage (30) is provided. The air introduction passage (30)
Formed so as to increase the ventilation resistance sucked from the drainage part (33) when negative pressure is applied to the outside, and to facilitate drainage of water entering from the suction port (3a) when the pressure is not negative pressure. A heating device for a vehicle, comprising a shield member (36) provided. 11. A vehicle mounted in an engine room of a vehicle,
A combustor (21) that performs auxiliary heating of a heating device; an intake port (30a) that is opened in the engine room to take in combustion air; and is housed in the combustor (21) and burns combustion air. An intake pipe (29) leading to the chamber; an air introduction passage (30) having one end connected to the intake port (30a) and the other end connected to the intake pipe (29); And a drain hole (31) for draining water entering through the air inlet (30a) to the outside of the air introduction passage (30), and opening and closing the drain hole (31). The second opening / closing member (3
7), wherein the second opening / closing member (37) has a drain portion (33) for draining water that has entered through the suction port (3a) to the outside, and when the drain portion (33) is flooded. The drainage section (33)
A heating device for a vehicle, wherein the heating device is deformed by buoyancy of water to close the drain hole (31). 12. The second opening / closing member (37) is provided with a floating member (37a) formed of a floating material having a specific gravity smaller than that of water in the vicinity of the drainage part (33). The heating device for a vehicle according to claim 11, wherein the water drainage portion (33) is deformed by buoyancy of water when the water is flooded to close the drainage hole (31).