JP2000227065A - Combustion type heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To retain warmth of fuel for combustion for facilitating ignition of fuel for combustion of a combustion type heater without using electrical means. SOLUTION: In this combustion type heater 1 provided with a combustion cylinder 3 burning fuel, a fuel feed pipe 5 feeding fuel to the combustion cylinder 3, a glow plug igniting fuel, a burned gas exhaust pipe 11 exhausting burned gas generated by combustion of fuel outward, and a thermal medium Wa heated by receiving the heat of the burned gas until the burned gas is exhausted from the burned gas exhaust pipe 11, and raising the temperature of an engine main body by sending the heated medium Wa from a thermal medium passage 19 to the engine main body, a heat insulating part 12 retaining warmth of the fuel feed pipe 5 is provided by including the heated thermal medium Wa and covering the fuel feed pipe 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a combustion type heater. More specifically, the present invention relates to a combustion type heater used for an internal combustion engine, for example, for promoting warm-up of the internal combustion engine in cold weather and improving startability.

[0002]

2. Description of the Related Art An internal combustion engine is provided with, for example, a combustion-type heater in order to promote warm-up and to improve startability especially in cold weather.

[0003] The combustion heater includes a combustion section for performing combustion, a fuel supply section for supplying fuel to the combustion section, an ignition section for igniting the fuel, and the combustion section for starting combustion by igniting the fuel by the ignition section. At least a combustion gas discharge section for discharging combustion gas from the section to the outside.

[0004]

By the way, combustion is
This is a phenomenon in which the fuel is obtained by obtaining oxygen in the air while the fuel is at a certain temperature or higher. However, when the fuel is cold, it is difficult to ignite even if the combustion heater is operated because the fuel is cold.

Therefore, for example, Japanese Patent Application Laid-Open No. Hei 6-347028 discloses a technique in which fuel is heated and kept warm by electricity, thereby preventing the fuel from being excessively cooled. Therefore, according to this technique, the combustion type heater is easily ignited even when the outside air temperature is low.

However, the technique disclosed in the above publication has an advantage that the ignition of the combustion type heater can be easily performed even in cold weather, but also consumes electric power to maintain the heat retention of the fuel necessary for improving the ignition. There's a problem.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a combustion type heater capable of keeping the temperature of fuel for facilitating ignition of the combustion type heater without using electricity. Subject.

[0008]

In order to solve the above-mentioned problems, the combustion heater of the present invention employs the following means. That is, a combustion section for burning fuel, a fuel supply section for supplying fuel to the combustion section, an ignition section for igniting the fuel supplied from the fuel supply section, and a combustion gas generated by burning the fuel to the outside. A combustion gas discharge portion to be discharged, a heat medium heated by receiving heat of the combustion gas until the combustion gas is discharged from the combustion gas discharge portion, and a heat medium passage through which the heat medium flows. A combustion-type heater that raises the temperature of the required portion by sending the heated heat medium to the required portion from the heat medium passage, enclosing the heated heat medium and covering the fuel supply portion. As a result, the fuel supply unit is provided with a heat retaining unit.

[0009] Here, the "fuel supply unit" means, for example, a unit for sending fuel from a fuel pipe to a combustion unit by a pump pressure of a fuel pump. The “ignition section” is preferably a glow plug, for example, which generates heat when energized by a battery.

[0010] The "heat medium" is preferably a fluid that is a gas or a liquid, but is not limited to a fluid as long as it can be heated to receive heat and move to a required location in that state. It is preferable that the "heat retaining section" can keep at least the fuel supply section warm after the combustion of the combustion heater. In addition, it is desirable that the heat retaining section is hollow so that the heat medium can be included in the heat retaining section, and the heat medium is stored therein.

In the present invention, the fuel supply section is covered with a heat retaining section containing the heated heat medium. Therefore, if the heating medium is heated to a higher temperature than before, the heat supply also heats the fuel supply unit. In addition, the heat retaining section also keeps the fuel supply section warm. For this reason, even after the combustion in which the temperature of the combustion heater itself decreases, it is possible to prevent the temperature of the fuel supply unit from decreasing. Therefore, the temperature of the fuel supplied to the combustion unit through the fuel supply unit is also unlikely to decrease, and the next ignition performed by the ignition unit is facilitated.

As described above, in the present invention, the fuel is kept warm using the heat of the heat medium. In addition, if the heat medium is at a high temperature, the temperature of the fuel becomes high due to the heat. Therefore, electricity need not be used for keeping the fuel warm or heating as in the prior art described above. Therefore, power consumption can be reduced accordingly.

As a further preferred means, the combustion section includes a combustion tube which generates a flame by igniting the fuel supplied by the fuel supply section by the ignition section, and which becomes a combustion source of the combustion section by generation of the flame. , The heat retaining section,
It is preferable to enclose the combustion tube. In addition, it is necessary that the flame emitted from the combustion cylinder when the combustion cylinder is wrapped is not blocked by the heat retaining unit. By wrapping the combustion tube with the heat retaining section, the heat retaining property of the combustion tube is enhanced. As a result, the temperature of the combustion cylinder is less likely to decrease, so that the temperature of the fuel can be further prevented from decreasing due to the heat. As a result, the fuel temperature is unlikely to decrease even if the period until the next ignition is long.

More preferably, the heat retaining section is connected to the heat medium passage, and an opening / closing valve is provided in the middle of the connection, so that the temperature of the heat medium included in the heat retaining section is equal to the temperature of the heat medium in the heat medium passage. In the above case, the on-off valve may be closed, and when the temperature of the heat medium included in the heat retaining section is lower than the temperature of the heat medium in the heat medium passage, the on-off valve may be opened.

Therefore, when the temperature of the heat medium included in the heat retaining section is equal to or higher than the temperature of the heat medium in the heat medium passage, the on-off valve is closed to prevent the heat medium from flowing. For this reason, the high-temperature heat medium included in the heat retaining section stays in the heat retaining section, so that the temperatures of the heat medium and the heat retaining section are less likely to decrease. Also,
When the temperature of the heat medium in the heat retaining section is lower than the temperature of the heat medium in the heat medium passage, the on-off valve is opened to circulate the heat medium. Therefore, the high-temperature heat medium in the heat medium passage can be introduced into the heat retaining section, and the temperatures of the heat medium and the heat retaining section increase.

Further, it is preferable that a temperature comparison means determines a height relationship between a temperature of the heat medium included in the heat medium passage and a temperature of the heat medium included in the heat retaining section. here,
A computer can be used as the temperature comparison means. Also,
The combustion type heater can be applied to an internal combustion engine, for example. In this case, the temperature comparison means corresponds to an ECU which is an engine control device. Also, if the heat medium passage of the combustion heater is connected to the water jacket of the internal combustion engine, engine cooling water in the water jacket can be supplied to the heat retaining section as the heat medium. Since the existing engine cooling water in the internal combustion engine can be used as a heat medium for the combustion heater,
There is no need to separately prepare the engine cooling water and the heat medium. Then, the temperature of the engine cooling water flowing through the heat medium passage and the temperature of the engine cooling water included in the heat retaining unit are detected by, for example, a temperature sensor. When the detection value detected by the temperature sensor is sent to the ECU as an electric signal, the ECU determines from the sent electric signal the level relationship between the temperature of the heat medium included in the heat medium passage and the temperature of the heat medium included in the heat retaining unit. Is determined. Then, according to this determination, the on-off valve is operated as described above.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the combustion type heater according to the present invention will be described below with reference to the accompanying drawings. The structure of the combustion heater will be described with reference to FIGS.

The combustion type heater shown in this embodiment is a so-called vaporization type combustion heater. The vaporization type combustion heater (hereinafter simply referred to as “combustion type heater”) 1 heats a heat medium with heat obtained by burning fuel, in other words, combustion heat which is the heat of combustion gas, and this heated heat This is a heater that raises the temperature of the necessary location by sending the medium to the required location.

The structure includes a combustion tube 3 as a combustion source that emits a flame F, a fuel supply pipe (fuel supply section) 5 for supplying liquefied fuel 4 for combustion to the combustion cylinder 3, and the fuel supply pipe 5. A fuel vaporizing section 6 that vaporizes the liquefied fuel supplied to the combustion cylinder 3 to become a vaporized fuel 4 ′; an air supply pipe 7 that supplies combustion air to the vaporized fuel 4 ′ vaporized by the fuel vaporizing section 6; A glow plug (ignition portion) 8 that ignites the vaporized fuel 4 ′ supplied with air from the supply pipe 7, and a fire type F ′ grows into a flame F of an appropriate size after the vaporized fuel 4 ′ is ignited by the glow plug 8. Using a blower fan 10 that blows toward the combustion tube 3 to perform combustion by using the wind force of the blower fan 10,
A combustion gas discharge pipe (combustion gas discharge portion) 11 for discharging combustion gas from the combustion cylinder 3 to the outside of the combustion type heater 1; It is provided.

Next, these components of the combustion type heater 1 will be described in detail. The combustion tube 3 is located at a substantially central portion in the longitudinal direction in the outer wall 17. Then, a combustion chamber (combustion section) 16 in which combustion is performed inside the combustion type heater 1 is formed by covering the combustion cylinder 3 with a cup-shaped partition wall 14. Also, there is a space between the outer surface of the partition 14 and the inner surface of the outer wall 17 of the combustion type heater 1, so that the partition 1
4 is formed with a space portion 19 extending over the entire outer surface. The space 19 is a heat medium passage of the combustion heater 1 through which the heat medium Wa passes. The space 19 is hereinafter referred to as a heat medium passage 19.

The heat medium Wa passing through the heat medium passage 19 is introduced from outside the combustion heater 1. After the heat medium Wa is introduced into the heat medium passage 19, the heat medium Wa passes from the heat medium passage 19 via the heat medium passage 19 to the combustion type heater 1.
To the required areas outside of the In this connection, both ends of the heat medium passage 19 are a heat medium inlet 19a for introducing the heat medium Wa into the heat medium passage 19 and a heat medium outlet 19b for discharging the heat medium Wa from the heat medium passage 19, respectively. . The heat medium outlet 19b is provided with a temperature sensor 18 for measuring the temperature T1 of the heat medium Wa flowing therethrough.

On the other hand, when the fuel is ignited by the glow plug 8 in the combustion chamber 16, the combustion of the combustion type heater 1 starts. Then, while the heat medium Wa passes through the heat medium passage 19 during combustion, heat of combustion is transmitted to the heat medium Wa via the partition wall 14. Therefore, since the heat medium passage 19 is a portion where the combustion heat is transmitted to the heat medium Wa via the partition wall 14, the heat medium passage 1
9 can be called a heat transfer part.

The combustion cylinder 3 is entirely covered with a hollow cylindrical wall 12 having a hollow cylindrical shape on its outer peripheral surface 3a. At this time, the flame coming out of the combustion tube 3 is not hindered by the hollow cylindrical wall 12. Then, the wall portion 1 of the hollow cylindrical wall 12
2a has a storage section S which is a space area therein, and the heat medium Wa enters the storage section S. Heat medium Wa in storage part S
, The hollow cylindrical wall 12 contains the heat medium Wa. The storage section S employs, for example, a so-called thermos structure or a structure equivalent thereto. The thermos structure is a structure that reduces the degree of heat conduction, convection and radiation by applying a vacuum between the inner and outer two layers of glass and applying silver plating on the inner surface so that the temperature of the fluid put inside can be maintained for a long time. is there. Therefore, the heat medium Wa entering the storage section S is kept warm for a long time. Also,
When the heat medium Wa enters the storage section S, the hollow cylindrical body 12 becomes substantially at the same temperature as the temperature of the heat medium Wa. Thus, the combustion cylinder 3 wrapped in the hollow cylinder 12 is also kept warm by the hollow cylinder 12. The hollow cylinder 12 is also provided with a temperature sensor for detecting the temperature of the heat medium Wa contained in the storage section S. This temperature sensor is indicated by reference numeral 21.

Then, the heat medium outlet 1 of the heat medium passage 19 is moved so that the heat medium Wa can be taken in and out of the storage section S.
9b is connected to an appropriate location of the storage section S by a connection pipe 20. The heat medium Wa flows between the hollow cylindrical body 12 and the heat medium passage 19 via the connection pipe 20. An on-off valve 20a is provided in the middle of the connection pipe 20, and the connection pipe 20 is opened or closed by the operation of the on-off valve 20a. The on-off valve 20a is connected to the temperature T of the heat medium Wa in the hollow cylindrical body 12.
2 based on Specifically, when the temperature T2 of the heat medium Wa in the hollow cylindrical body 12 is lower than the temperature T1 of the heat medium Wa in the heat medium passage 19, the on-off valve 20a is opened to open the connection pipe 20, and the temperature T2 becomes equal to the temperature. If there is T1 or more, the on-off valve 20a is closed and the connection pipe 20 is closed.

On the other hand, the temperature sensor 18 and the temperature sensor 2
1 of the heat medium W in the heat medium passage 19 detected by
The temperature T1 of a and the temperature T2 of the heat medium Wa of the hollow cylindrical body 12 are transmitted as electric signals to an appropriate computer. Based on these electric signals, the computer compares and determines the level relationship between the temperatures T1 and T2, and opens and closes the on-off valve 20a based on the determination result. Therefore, the computer can be said to be a temperature comparing means.

On the other hand, the combustion type heater 1 has an air supply port 22 for introducing combustion air into the combustion chamber 16 and a combustion gas discharge port 23 for discharging combustion gas from the combustion chamber 16. The air supply port 22 and the combustion gas discharge port 23 are connected to the air supply pipe 7 and the combustion gas discharge pipe 11, respectively.

Next, the blower fan 10 is disposed on the side of the combustion type heater 1 opposite to the side where the flame F exits from the combustion tube 3. By installing the blower fan 10 at a position facing the air supply port 22, the amount of outside air sucked by the blower fan 10 is increased, thereby increasing the amount of intake air supplied to the combustion cylinder 3. Further, the amount of air flowing through the combustion chamber 16 can be controlled by adjusting the output of the blower fan 10.

Then, as can be seen from FIG.
The fuel vaporizer 6 having a planar shape such as forming the bottom of the combustion tube 3 is provided at a position near the blower fan 10 among them. The fuel supply pipe 5 for supplying the liquefied fuel 4 to the fuel vaporization section 6 extends from outside the combustion heater 1 near the fuel vaporization section 6 in the combustion chamber 16. The fuel supply pipe 5 penetrates through the hollow cylindrical body 12 and the combustion cylinder 3 and protrudes into the combustion cylinder 3. Connect the fuel supply pipe 5 to the hollow cylindrical body 1
In order to prevent the heat medium Wa from leaking out of the storage section S even if the heat medium Wa is penetrated through the second section 2, the intersection portion 5a of the fuel supply pipe 5 with the heat retaining wall 12 is subjected to water leakage prevention processing. Further, by penetrating the fuel supply pipe 5 through the hollow cylindrical body 12, the crossing portion 5 a of the fuel supply pipe 5 is substantially covered with the wall 12 a of the hollow cylindrical body 12.
When the high-temperature heat medium Wa is introduced into the storage section S, the temperature of the fuel supply pipe 5 is increased by the heat of the high-temperature heat medium Wa, and the fuel supply pipe 5 is kept warm. Therefore, the fuel in the fuel supply pipe 5 is also heated and kept warm. Therefore, the hollow cylindrical body 12 is referred to as a heat retaining section for keeping the temperature of the combustion tube 3 and the fuel supply pipe 5 warm.

As the water leakage prevention processing, for example, a through hole through which the fuel supply pipe 5 passes is provided in advance in the wall portion 12a of the hollow cylindrical body 12, and the storage portion S is provided so as to avoid this through hole. Can be considered.

The fuel supply pipe 5 is connected to a fuel pump (not shown).
Is discharged. In the vicinity of the fuel supply pipe 5, the glow plug 8 that generates heat when energized by a battery (not shown) is provided. The glow plug 8 also penetrates the combustion tube 3 and the wall portion 12a in a state where a water leakage prevention process is performed,
It is in a state of protruding into the combustion cylinder 3. An ignition sensor (not shown) for detecting whether the fuel is ignited by the glow plug 8 is provided in the combustion cylinder.

Next, an example in which the combustion heater 1 is applied to an engine 3 which is an internal combustion engine will be described with reference to FIG. The engine 31 as an internal combustion engine is a diesel engine or a gasoline direct injection lean burn engine. Engine 3
1 includes an engine body 33 having a water jacket (not shown) containing engine cooling water, an intake device 35 for feeding air necessary for combustion into a plurality of cylinders (not shown) of the engine body 33, and An exhaust device 37 for releasing an exhaust gas discharged from the cylinder to the atmosphere after a mixture of air sent to the cylinder and engine fuel injected and supplied to the cylinder is burned in the cylinder; A vehicle compartment heater 39 for increasing the indoor temperature of a vehicle equipped with the ECU, and an ECU 40 as an engine control device. The combustion heater 1 according to the present invention belongs to the intake device 35.

The intake device 35 has an intake pipe 44 which starts with an air cleaner 43 for filtering outside air and ends with an intake port (not shown) of the engine body 3. A combustion type heater 1 and a compressor 45 of a turbocharger 45 are provided between the air cleaner 43 and the intake port in the intake pipe 44.
a, an intercooler 49 for cooling the intake air temperature which has been raised by the compression heat generated when the compressor 45a is operated,
An intake system structure such as an intake manifold 51 which is a suction branch pipe is sequentially arranged.

The combustion type heater 1 located upstream of the compressor 45a is attached to the intake pipe 44 via the air supply pipe 7 and the combustion gas discharge pipe 11. In addition,
A connection point between the intake pipe 44 and the air supply pipe 7 is denoted by reference numeral C1, and a connection point between the intake pipe 44 and the combustion gas discharge pipe 11 is denoted by reference numeral C2. The connection point C2 is downstream from the connection point C1.

The exhaust device 37 has an exhaust pipe 72 starting from an exhaust port (not shown) of the engine body 33 and terminating at a muffler 71 as a silencer. The exhaust pipe 72 is provided between the exhaust port and the muffler 71 between the exhaust manifold 68 and the turbocharger 45 which are exhaust branch pipes.
And an exhaust system structure such as a catalytic converter 79 as an exhaust gas purifying device.

Next, the path from the outside air entering the intake pipe 44 from the air cleaner 43 to the exhaust gas, passing through the muffler 71 and being discharged to the atmosphere will be described. The outside air A that has entered the intake pipe 44 from the air cleaner 43 is first divided into air a1 that branches to the air supply pipe 7 at the connection point C1 and air a1 ′ that branches the intake pipe 44 to the connection point C2 without branching. The air a1 branched at the connection point C1 returns to the intake pipe 44 as combustion gas a2 from the connection point C2 via the air supply pipe 7, the combustion chamber 16 of the combustion type heater 1, and the combustion gas discharge pipe 11.

Since the combustion gas a2 is the exhaust gas of the combustion type heater 1, it has heat, that is, combustion heat. This combustion heat is transmitted to the heat medium Wa in the heat medium passage 19 and increases the temperature of the heat medium Wa. In this embodiment, since the combustion heater 1 is applied to the engine 31 which is an internal combustion engine, engine cooling water is used as a heat medium. Therefore, the reference sign Wa indicating the heat medium is used hereinafter for the engine cooling water.

The description of the flow path of the combustion gas a2 will be continued.
The combustion gas a2 that has entered the intake pipe 44 merges with the air a1 'at the connection point C2 to become combustion gas-mixed air a3. Then, the combustion gas mixed air a3 becomes intake air of the engine 31 and is used for engine combustion, and then becomes exhaust gas a4.
Thereafter, the exhaust gas a4 is discharged to the atmosphere via the exhaust manifold 68, the turbine 45b, the catalytic converter 79, and the muffler 71 arranged on the exhaust pipe 72.

Next, the flow path of the engine cooling water Wa will be described. The combustion type heater 1, the engine main body 33 and the vehicle interior heater 39 are connected using a water pipe through which engine cooling water passes. Specifically, the combustion type heater 1 is connected between the engine main body 3 and the vehicle interior heater 39 via a water pipe W1 and a water pipe W2. Also, the heater 39 for the passenger compartment
And the engine main body 33 are connected via a water pipe W3.

The engine cooling water Wa in the water jacket of the engine body 33 first enters the combustion heater 1 through the water pipe W1. At this time, the engine cooling water enters the heat medium passage 19 from the heat medium inlet 19 a of the heat medium passage 19. The engine cooling water Wa that has entered the heat medium passage 19 then flows around the combustion chamber 16, that is, the entire outer wall surface of the partition wall 14, and the heat medium discharge port 19 of the heat medium passage 19.
Proceed toward b. At this time, if the combustion heater 1 is operating, the engine cooling water Wa flows through the combustion chamber 16
It receives the heat of combustion transmitted from it and warms up. The warmed engine cooling water eventually enters the water pipe W2 via the heat medium discharge port 19b. The engine cooling water that has entered the water pipe W2 passes through the water pipe W2 and then reaches the vehicle interior heater 39. The engine cooling water that has reached the vehicle interior heater 39 generates hot air for increasing the temperature in the vehicle interior from the vehicle interior heater 39 so that the vehicle interior heater 39 emits hot air.
, And then returns to the water jacket of the engine body 33 via the water pipe W3. Thereafter, the above process is repeated as necessary.

As described above, a series of pipes formed by interposing the engine body 3, the combustion heater 1 and the cabin heater 39 in the middle thereof and connecting them by the water pipes W1 to W3 are referred to as a cooling water circulation path W.

The engine cooling water Wa is supplied to the cooling water circuit W
In addition, the heat flows from the heat medium passage 19 to the heat retaining wall 12 via the connection pipe 20. On the other hand, regardless of the presence or absence of the illustration, various sensors and the blower fan 1 included in the engine 31 are provided.
0 and the like are connected to the ECU 40. Then, based on the output values of these various sensors, the ECU 40 opens and closes the connection pipe 20 by operating the opening / closing valve 20a of the combustion type heater 1 as well as the engine main body 33. The ECU 40 also compares and determines the relationship between the temperatures T1 and T2.

Next, an opening / closing operation control execution routine of the opening / closing valve 20a will be described with reference to a flowchart of FIG. This routine is a part of a normal engine operation control execution routine (not shown) for operating the engine 1 and includes steps S101 to S105 described below. The processing of each step is performed by the ECU 40.

In step S101, the ignition key is turned on. In S102, the temperature T2 of the engine cooling water Wa in the hollow cylindrical wall 12 is detected by the temperature sensor 21. Also,
The engine cooling water Wa of the heat medium passage 19 is detected by the temperature sensor 18.
Is detected.

In S103, it is determined whether the temperature T2 is equal to or higher than the temperature T1. If a positive determination is made in S103, that is, if T2 ≧ T1, the process proceeds to S104, and if a negative determination is made, that is, if T2 <T1, the process proceeds to S105.

In S104, the on-off valve 20a of the connection pipe 20 connecting the heat medium passage 19 and the hollow cylindrical wall 12 is closed. After that, the process returns to S102, and the above-described processes after S102 are repeated.

In S105, the on-off valve 20a of the connecting pipe 20 connecting the heat medium passage 19 and the hollow cylindrical wall 12 is opened. After that, the process returns to S102, and the above-described processes after S102 are repeated. Next, the operation and effect of the embodiment will be described.

When the engine cooling water enters the storage section S of the hollow cylindrical wall 12, the temperature of the hollow cylindrical wall 12 becomes a temperature corresponding to the temperature of the engine cooling water contained in the storage section S. That is, the engine cooling water Wa also serves as a heat source for warming the hollow cylindrical wall 12.

The hollow cylindrical wall 12 has a thermos structure. Therefore, it is possible to prevent the temperature of the engine cooling water of the hollow cylindrical wall 12 from lowering and keep the temperature. In other words, the hollow cylindrical wall 12
It is possible to prevent the temperature from dropping. The combustion tube 3 is surrounded by a hollow cylindrical wall 12. The fuel supply pipe 5 penetrates through the hollow cylindrical wall 12 and the combustion cylinder 3 in this state, and the fuel supply pipe 5 protrudes into the combustion cylinder 3. Therefore, the portion 5a of the fuel supply pipe 5 that intersects with the hollow cylindrical wall 12 is the wall portion 12a of the hollow cylindrical wall 12.
Thus, in other words, the state is covered with the engine cooling water contained in the storage portion S in the wall portion 12a. The hollow cylindrical wall 12 has a temperature corresponding to the temperature of the engine cooling water as described above. Therefore, if the temperature of the engine cooling water is high, the temperature of the fuel supply pipe 5 and thus the temperature of the liquefied fuel in the fuel supply pipe 5 Increase and keep warm. Therefore, even after the end of combustion in which the temperature of the combustion heater itself decreases, the temperature of the fuel supply pipe 5 can be prevented from lowering for a long time. Therefore, at the time of the next ignition performed after the combustion type heater 1 has finished burning once,
Warm liquefied fuel 4 can be supplied into combustion cylinder 3. Therefore, if the warm liquefied fuel 4 is vaporized in the fuel vaporization section 6,
Since the temperature of the vaporized fuel 4 'is also high, the glow plug 8
It is easy to ignite. Further, the combustion cylinder 3 is formed by the hollow cylindrical wall 12.
, It is difficult for the entire combustion cylinder 3 to cool. Therefore,
It is easier to ignite. Furthermore, if the temperature of the combustion tube 3 is hard to decrease, the ambient temperature around the combustion tube 3 is hard to decrease, so that misfire can be prevented. As a result, the rate of generation of unburned gas can be reduced.

As described above, in the combustion type heater 1,
In order to facilitate the ignition, the combustion fuel is kept warm using the heat of the engine cooling water Wa. Therefore, unlike the related art in which electricity is used for keeping the temperature of the combustion fuel, no electric power is consumed for keeping the temperature. Thus, the battery lasts longer.

When the combustion type heater 1 is mounted on the engine 31, the combustion type heater 1 is connected to the intake pipe 44 by using the air supply pipe 7 and the combustion gas discharge pipe 11.
Therefore, the combustion air enters the combustion tube 3 via the air supply pipe 7, and the combustion gas discharged from the combustion tube 3 flows to the intake pipe 44 via the combustion gas discharge pipe 11. Then, the combustion gas flowing into the intake pipe 44 reaches the cylinder of the engine main body 33 via the intake pipe 44 as intake air with a higher temperature, and directly warms the cylinder by the heat of the combustion gas.

Further, the combustion type heater 1, the engine body 3
3 and the heater 39 for the vehicle interior are connected using water pipes W1, W2 and W3. Therefore, the engine body 33
The engine cooling water circulates between the engine body 33, the combustion type heater 1, and the vehicle interior heater 39 via the water pipes W1, W2 and W3. During this circulation, the engine cooling water Wa is heated as a heat medium by the combustion heat of the combustion type heater 1, and the warmed engine cooling water Wa returns to the engine main body 33. warm.

As described above, since the combustion gas of the combustion type heater 1 directly or indirectly increases the temperature of the engine main body 33, which is a necessary portion via the engine cooling water, the warm-up can be promoted and the startability of the engine is enhanced. .

Further, since the engine cooling water is also used as a heat source for warming the hollow cylindrical wall 12, the engine cooling water can be used for other than its original function, which is economical. further,
Connecting the heat medium passage 19 and the heat retaining wall 12 with a connecting pipe 20;
The connection pipe 20 is provided with an on-off valve 20a that opens and closes based on the temperature T2 of the engine cooling water contained in the heat retaining wall 12. When the temperature T2 is equal to or higher than the temperature T1 of the engine cooling water flowing through the heat medium passage 19, the on-off valve 20a is closed, and when the temperature T2 is lower than the temperature T1, the on-off valve 20a is opened. Therefore,
When the temperature T2 is equal to or higher than the temperature T1, the high-temperature engine cooling water stays in the heat retaining wall 12 and does not flow out therefrom, so that the temperatures of the engine cooling water and the heat retaining wall 12 are hardly lowered. Also,
When the temperature T2 is lower than the temperature T1, the heat medium passage 19
In order to introduce the high-temperature engine cooling water in
The temperature of the heat retaining wall 12 can be increased.

As described above, the engine cooling water in the heat insulation wall 12 flows between the heat insulation wall 12 and the heat medium passage 19 via the connection pipe 20. The fluid force for flowing the engine cooling water Wa necessary for the circulation is due to the convection of the engine cooling water Wa when the engine 31 is started. The engine cooling water Wa may flow between the heat retaining wall 12 and the heat medium passage 19 by using an appropriate circulating device such as an electric motor in addition to or instead of convection.

[0055]

As described above, according to the combustion heater of the present invention, it is necessary to use electricity to keep the temperature of the combustion fuel for facilitating ignition of the combustion fuel by the combustion heater. There is no power consumption. Further, ignition of the combustion type heater can be easily performed.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view of a combustion heater according to an embodiment of the present invention.

FIG. 2 is a partially omitted cross-sectional view taken along a virtual cross section including the line II-II in FIG.

FIG. 3 is a schematic configuration diagram showing a case where the combustion heater of the present invention is applied to an internal combustion engine.

FIG. 4 is a flowchart showing a control routine for performing opening / closing operation control of a connection pipe provided in the combustion heater according to the embodiment of the present invention;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Combustion heater 3 ... Combustion cylinder 3a ... Outer peripheral surface of combustion cylinder 3 4 ... Liquefied fuel (fuel) 4 '... Vaporized fuel (fuel) 5 ... Fuel supply pipe (fuel supply part) 5a ... Of fuel supply pipe 5 A portion crossing the heat retaining wall 6; a fuel vaporizing portion 7; an air supply tube 8; a glow plug (ignition portion) 10; a blowing fan 11; a combustion gas discharge tube (combustion gas discharge portion) 12; Part) 12a ... wall part 14 ... partition wall 16 ... combustion chamber (combustion part) 18 ... temperature sensor 19 ... heat medium passage (heat transfer part) 19a ... heat medium inlet 19b ... heat medium outlet 20 ... connection pipe 20a ... opening and closing Valve 21 Temperature sensor 22 Air supply port 23 Combustion gas discharge port 31 Engine 33 Engine body (necessary parts) 35 Intake device 37 Exhaust device 39 Vehicle heater 40 ECU (Temperature comparison means) 43 … Air cleaner 4 ... Intake pipe 45 ... Turbocharger 45a ... Compressor 45b ... Turbine 49 ... Intercooler 51 ... Intake manifold 71 ... Muffler 68 ... Exhaust manifold 79 ... Catalytic converter 72 ... Exhaust pipe A ... Outside air C1 ... Intake pipe 44 and air supply pipe 7 Connection point C2: Connection point between intake pipe 44 and combustion gas exhaust pipe 11 F: Flame F ': Fire type T1: Temperature of heat medium Wa passing through heat medium passage 19 T2: Temperature of heat medium Wa flowing through heat insulation wall 12 Temperature S: Reservoir W: Cooling water circuit W1: Water pipe W2: Water pipe W3: Water pipe Wa: Heat medium (engine cooling water) a1: Air branched to the air supply pipe 7 at the connection point C1 a1 ': Intake pipe Air flowing toward connection point C2 through 44 a2 ... Combustion gas a3 ... Air mixed with combustion gas a4 ... Exhaust gas

Claims (5)

[Claims] 1. A combustion section for burning fuel, a fuel supply section for supplying fuel to the combustion section, an ignition section for igniting fuel supplied from the fuel supply section, and a combustion gas generated by burning the fuel. A combustion gas discharge section for discharging the heat to the outside, a heat medium heated by receiving heat of the combustion gas until the combustion gas is discharged from the combustion gas discharge section, and a heat medium through which the heat medium flows A combustion type heater having a passage, wherein the heated heat medium is sent from the heat medium passage toward a required portion to raise the temperature of the required portion. The combustion type heater includes the heated heat medium and supplies the fuel. A combustion type heater having a heat retaining part for keeping the fuel supply part warm by covering the part. 2. The combustion unit includes a combustion cylinder that generates a flame by igniting the fuel supplied by the fuel supply unit by the ignition unit and generates a flame by the generation of the flame. The combustion type heater according to claim 1, wherein said combustion cylinder is wrapped. 3. The method according to claim 1, further comprising: connecting the heat retaining section to the heat medium passage, providing an on-off valve in the middle of the connection, wherein the temperature of the heat medium included in the heat retaining section is higher than the temperature of the heat medium in the heat medium path. 3. The valve according to claim 1, wherein the on-off valve is closed, and the on-off valve is opened when a temperature of the heat medium included in the heat retaining section is lower than a temperature of the heat medium in the heat medium passage. Combustion heater. 4. A temperature comparing means for judging a height relationship between a temperature of a heat medium included in the heat medium passage and a temperature of a heat medium included in the heat retaining section.
The combustion type heater according to the above. 5. The combustion type according to claim 4, wherein the heat medium passage is connected to a water jacket of the internal combustion engine, and engine cooling water in the water jacket is supplied to the heat retaining section as the heat medium. heater.