JPH0584407B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a combustor for rapid heating of a heating device for rapidly heating the interior of an automobile driven by an internal combustion engine.

(Prior art) Conventionally, indoor heating in automobiles takes the cooling water from the internal combustion engine through hot water piping, passes it through the heater body made up of a heater core, blower, etc., and sends air into the heater body to heat the air and heat it. A type that performs heating, or a type that burns fuel in a burner independently of the internal combustion engine and uses the generated heat to heat the room (Japanese Patent Application No. 106869/1982) is used.

(Problems with the prior art) In this method of using internal combustion engine cooling water for indoor heating, the temperature of the cooling water rises slowly, so it takes time for the heater body to send out hot air. However, during that time, the heating function of the heater is lost. In addition, heating methods that use fuel separately from the internal combustion engine require troublesome combustion cycles and exhaust gas processing, and require complex control mechanisms and control devices, which have the disadvantage of increasing costs. arise, furthermore,
Problems also remain in terms of environmental pollution (Objective of the Invention) An object of the present invention is to solve the above-mentioned problems regarding room heating of conventional internal combustion engines, and to reduce the environmental pollution by eliminating the need for a complicated control mechanism. No pollution problems,
Another object of the present invention is to provide a rapid heating combustor for a heating device for an automobile, which can rapidly obtain warm air after starting the engine.

(Summary of the Invention) In order to achieve the object of the present invention as described above, in a rapid heating combustor provided with a vaporizing pipe having a jet port for jetting fuel into the combustor provided in the middle of an air duct, the air A first combustion chamber that communicates with the upstream side of the duct and a first combustion chamber that communicates with the first combustion chamber via a honeycomb passage and that receives air supply from the upstream side of the air duct and allows combustion gas to flow downstream of the air duct. The present invention includes two combustion chambers, and a vaporization pipe that injects vaporized fuel from its tip into the first combustion chamber, has a fuel vaporization portion located in the second combustion chamber, and has a vaporization glow plug inside. A rapid heating combustor with features is provided.

(Embodiment) FIG. 1 is a cross-sectional view of the construction of an embodiment of a rapid heating combustor according to the present invention, and FIG. 2 is a block diagram of an automobile heating system using the embodiment.

As is clear from the figure, in the middle of the pipe section from the air cleaner 2 of the diesel engine or gasoline engine 1 to the intake pipe 3 which becomes the air duct, there is a rapid heating combustor 4 and a heat exchanger 5 downstream of it. It is provided. Further, an intake pipe 51 may exist in parallel with the combustor 4 and the heat exchanger 5.
In FIG. 1, the outside of the rapid heating combustor 4 is covered with a combustor housing 41, and two combustion chambers are provided inside, a first combustion chamber 42 in the upstream direction of the air flow and a second combustion chamber in the downstream direction. 2 combustion chambers 43 are configured,
There is a honeycomb passage 44 between the two that allows air to circulate.
is formed. Furthermore, the combustor housing 4
An air passage 45 is provided between the combustion chamber 1 and the two combustion chambers, and the air from the air cleaner 2 is passed through the air intake port 4.
6, passes through the air passage 45, passes through an air introduction path 47 consisting of a plurality of small holes drilled in the peripheral wall of the second combustion chamber 43, enters the second combustion chamber 43, and then enters the second combustion chamber 43 through the air passage 45. It is configured to flow out to the downstream heat exchanger 5 via. On the other hand, a part of the air from the air cleaner 2 passes through the plurality of air introduction holes 49 facing the air flow, enters the first combustion chamber 42, mixes with vaporized fuel to be described later, and passes through the honeycomb passage 44. It flows into the second combustion chamber 43 and is ignited by the ignition glow plug 6 provided in the second combustion chamber 43, producing high-temperature combustion gas, which heads toward the heat exchanger 5 together with the air via the air passage 45. . Further, the rapid heating combustor 4 has a vaporizing pipe 9 provided in the center thereof with a vaporizing glow plug 91 that heats and vaporizes the fuel coming from the fuel pump 7 via the fuel supply device 8 . Then, a vaporizing pipe 9 is installed at an angle so as to penetrate from the bottom of the combustion chamber outlet 48 side of the horizontally provided rapid heating combustor 4 to the center of the first combustion chamber 42. The ejection port 92 formed at the tip of the vaporizing pipe 9 is configured to face upward so that the fuel does not flow out from the ejection port 92. Further, the vaporizing pipe 9 passes through the second combustion chamber 43, and the second combustion chamber 43
A plurality of heat-receiving fins 93 are provided on the outer peripheral surface of the pipe that is in contact with the combustion gas generated by the vaporizer pipe 9. During normal combustion, the fuel is vaporized by the heat-receiving fins as much as possible to reduce electrical energy consumption. is configured to heat fuel passing through the interior of the fuel tank.

A vaporizing glow plug 91 coaxial with the vaporizing pipe 9 is formed of a ceramic heater, has a gap between it and the inner surface of the vaporizing pipe 9 to allow fuel and vaporized gas to pass, and has a positive temperature coefficient inside the pipe. Since the resistance wire 94 having a
By supplying electricity to and heating, the fuel flowing through the inner surface of the vaporizing pipe 9 is heated. Note that 95 is a terminal that supplies current to the resistance wire 94.

Therefore, the fuel flowing from the fuel supply device 8 and passing through the vaporization pipe 9 is transferred to the heat receiving fin 9.
At step 3, vaporized fuel is heated by the vaporizing pipe 9 that receives high heat from the combustion gas in the second combustion chamber 43, and by heating from the vaporizing glow plug 91, which is energized and has a high temperature especially at the beginning of combustion. The gas is ejected into the first combustion chamber 42 from the ejection hole 92 provided above the tip of the vaporizing pipe 9. And air introduction hole 4
The unburned gas mixes with the air flowing in from the second combustion chamber 43 and causes combustion by spreading the flame from the second combustion chamber 43. At the same time, the unburned gas passes through the honeycomb passage 44, where it is sufficiently mixed with air and becomes a combustible mixture. Combustion chamber 43
The unburned gas is completely combusted in the second combustion chamber. The tip of the ignition glow plug 6 is formed of a ceramic pipe, and a resistance wire 61 having a positive temperature coefficient is embedded inside.

Next, the heat exchanger 5 takes in new air from the intake air intake port 10 that passes into the interior of the car that needs heating, and the new air takes heat from the combustion gas and exchanges heat with it. A blower 12 is provided for blowing air up to the outlet 11. The air outlet 11 opens to an outlet of a cooling water heater core 13 which is separately placed for room heating. Therefore, the illustrated blower 14, air conditioner evaporator 15, and hot water passage 16 are each component of a heater device that uses cooling water.

17 is a controller which receives a power generation signal GT from the generator 18 driven by the engine 1.
and the ON/OFF signal FS of the operation switch 19,
Water temperature sensor 20 that detects engine cooling water temperature
a main control unit 171 to which the water temperature signal WS, start signal ST, and accelerator opening signal AS are input;
It is comprised of a bridge circuit 172 that controls the vaporization glow plug 91 to the fuel vaporization temperature, a bridge circuit 173 that always maintains the ignition glow plug 6 at the ignition temperature of vaporized fuel, and a switch section 174. Then, the main control section 171
is a computer configuration having a processing unit, memory, and an input/output interface.

The bridge circuit 172 connects the vaporizing glow plug 9
The resistance wire 94 that heats 1 is one side, and this is the resistance
It has a Wheatstone bridge consisting of r ₁ to _{r 3} , a comparator 172a that detects the balance state of this Wheatstone bridge, and a relay 172b that turns ON when the output of this comparator 172a is positive and turns OFF when it is negative. . and resistance r ₃
The resistance value of the resistance wire 94 is configured to be very small compared to the resistance value of the resistance wire 94.

The bridge circuit 173 has one side of the resistance wire 61 for heating the ignition glow plug 6, and a Wheatstone bridge consisting of this and resistors r ₄ to _{r 6} .
a comparator 173a for detecting the balance state of this Wheatstone bridge;
The relay 173b is ON when the output is positive and OFF when the output is negative. Note that the resistance value of the resistor r ₆ is configured to be very small compared to the resistance value of the resistance wire 61.

The switch unit 174 includes a switch 174a that controls ON/OFF of the blower 12, a switch 174b that controls the supply of power to the bridge circuit 173, and a switch 1 that controls the supply of power to the bridge circuit 172.
It has 74c. Also, 21 is the power supply battery,
22 is a key switch, and 23 is a starter motor.

Next, the operation of the rapid heating combustor according to the present invention in the automotive heating system having such a configuration will be explained.

When the engine key switch 22 is turned on,
The power of the car is turned on, but since the engine 1 has not started, the main control unit 171 turns on the switch 174.
Since all a to 174c are kept OFF, the heating system does not operate. When the key switch 22 is further rotated and the starter motor 23 is rotated by applying voltage, the engine 1 is started. Then, at the same time as the engine 1 is started, the main control section 171 turns on the switches 174c and 174b, and voltage is applied to the bridge circuit 172 and the bridge circuit 173. Therefore, the resistance wire 94 provided on the vaporizing glow plug 91 and the resistance wire 61 provided on the ignition glow plug 6 are heated. At the beginning of voltage application, both resistance wires 94 and 61 are at a low temperature, so their resistance values are also low, and comparator 17
Since the outputs of 2a and 173a are also positive, relays 172b and 173b remain ON, and voltage is continuously applied to resistance wires 94 and 61, causing rapid heating. And these resistance lines 94
When the temperatures of resistance wires 94 and 61 rise to their respective predetermined values, the resistance values of resistance wires 94 and 61 also rise to their respective predetermined values.
The voltage associated with the voltage also increases, and the outputs of the comparators 172a and 173a are inverted to negative values. For this reason, relay 1
72b and 173b are turned OFF, voltage supply to resistance wires 94 and 61 is cut off, and the temperature of these resistance wires 94 and 61 begins to decrease. On the other hand, relay 172
Since b and 173b are OFF, comparator 17
The outputs of 2a and 173a become positive, and relay 1
72b and 173b are turned ON again, and the resistance line 94
and 61 are reheating. Such an operation is repeated, and the resistance wires 94 and 61 are maintained at respective set predetermined temperatures.

Through such an operation, the resistance wires 94 and 61 are maintained at a predetermined temperature, and therefore, the vaporizing glow plug 91 and the ignition glow plug 6 also reach a predetermined temperature, and at the same time, the drive source 81 of the fuel supply device 8 is activated. Then, the supply valve 82 opens and fuel is supplied to the vaporization pipe 9. Therefore, as described above, the fuel passes through the vaporization pipe 9 heated by the vaporization glow plug 91, becomes vaporized fuel, and is injected into the first combustion chamber 42 through the honeycomb passage 44. The resulting mixture becomes a flammable mixture, which is ignited by the ignition glow plug 6 and becomes a high-temperature combustion gas inside the second combustion chamber 43, which flows into the heat exchanger 5.

On the other hand, when the engine 1 completes its starting operation and enters normal operation, a power generation signal GT from the generator 18 is sent.
The logical AND of the ON signal FS of the operation switch 21 and the ON signal FS of the operation switch 21 is calculated by software within the main control section 171.
As a result, the main control section 171 turns on the switch 174a.
When turned on, the blower 12 is energized and the blower 12 starts blowing air. Therefore, the air from the intake air intake port 10 heated by the high-temperature combustion gas in the heat exchanger 5 is blown out from the air outlet 11 as warm air, and the room heating starts immediately after the engine starts. Start.

Next, when the temperature of the cooling water rises to a level where it can be used as hot water for indoor heating after the engine 1 starts operating, the water temperature sensor 20 installed in the engine 1 operates and outputs a water temperature signal WS. As a result, the main control unit 171 instructs the drive source 81 to close the supply valve 82 and cut off the fuel supply. Further, the operation of the blower 12 attached to the vaporizing pipe 9, the ignition glow plug 6, and the heat exchanger 5 associated with the rapid heating combustor 4 is stopped, and another blower 14 is operated to replace the conventional cooling water. The heater starts heating operation.

Furthermore, if the engine 1 is started with the operation switch 19 in the OFF state from the beginning,
The AND of the power generation signal GT from the generator 18 and the ON signal FS of the operation switch 19 is the main controller 17
1, the blower 12 does not operate. However, in such a case, a large amount of air warmed by the flame is sent into the engine 1, so the quick start function allows the engine 1 to be started quickly even when the engine 1 is cold in winter. It becomes a device.

Although the present invention has been described with reference to one embodiment, for example, the blower devices are combined into one unit, the air passages are switched by opening and closing the damper, and the air from the heat exchanger 5 and the conventional cooling water heater are blown. Various modifications can be made within the scope of the invention, such as switching between the two, and these modifications are not excluded from the scope of the invention.

(Effects of the Invention) As explained in detail above, the present invention provides a rapid heating combustor and a heat exchanger in the middle of the intake pipe leading to the engine, and a vaporizing pipe for vaporizing fuel in the rapid heating combustor. A combustion chamber equipped with a glow plug for ignition is installed to rapidly burn the fuel, and the heat of the combustion gas is recovered by a heat exchanger and used as a heating heat source, so even immediately after the engine starts, it can be used indoors. Heating can be done effectively.

Further, according to the present invention, even when the engine is cold in cold weather, it is possible to send a large amount of warm air heated by the rapid heating combustor to the engine, so the engine can be started quickly. This prevents blue-white smoke and odor from the exhaust gas, improving engine performance.

Furthermore, according to the present invention, in the rapid heating combustor provided with a vaporizing pipe having a jet port for ejecting fuel into the combustor provided in the middle of the air duct, the first combustion chamber communicates with the upstream side of the air duct. room and
A second combustion chamber communicates with the first combustion chamber via a honeycomb passage and receives air supply from the upstream side of the air duct and causes combustion gas to flow downstream of the air duct;
The vaporizer pipe injects vaporized fuel from its tip into the first combustion chamber and has a fuel vaporization portion located in the second combustion chamber and a vaporization glow plug inside, so that the fuel can be Complete combustion occurs in one combustion chamber with a sufficient supply of air, and there is no need for troublesome treatment of combustion odors or exhaust gases, and there are fewer environmental pollution problems.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of the construction of an embodiment of a rapid heating combustor according to the present invention, and FIG. 2 is a block diagram of an automobile heating system using the embodiment. DESCRIPTION OF SYMBOLS 1... Engine, 3... Intake pipe, 4... Combustor for rapid heating, 5... Heat exchanger, 6... Glow plug for ignition, 9... Vaporizing pipe, 91... Glow plug for vaporizing, 92 ... spout, 93 ... heat receiving fin.

Claims (1)

[Scope of Claims] 1. In a rapid heating combustor provided with a vaporizing pipe having an injection port for ejecting fuel into a combustor provided in the middle of an air duct, the first combustion chamber communicates with the upstream side of the air duct. and a second combustion chamber that communicates with the first combustion chamber via a honeycomb passage, receives air from the upstream side of the air duct, and allows combustion gas to flow downstream of the air duct, and a second combustion chamber that communicates with the first combustion chamber through a honeycomb passage. A quick heating combustor comprising: a vaporizing pipe that injects fuel into a first combustion chamber and has a fuel vaporizing portion located in a second combustion chamber, and has a vaporizing glow plug inside.