JPS6371410A - Heating device for vehicle - Google Patents

Abstract

PURPOSE:To reduce the power consumption of a blower by taking in a combustion air from an air cleaner for engine when feeding a combustion gas into an intake pipe, while taking in the combustion air from a separate air cleaner when discharging the combustion gas out to the open air. CONSTITUTION:A first air cleaner 24 for engine is provided on the upper course of the intake pipe 3 of an engine 1. And, a selector valve 19 is provided on the branch part at which an intake bypass 4 is connected to the intake pipe 3, and the combustion air passage 17 of a second air cleaner 23 is provided on the intake bypass 4. The selector valve 19 enables the opening/closing switchover between the connected condition of the intake pipe 3 and the intake bypass 4, and the connected condition of the combustion air passage 17 of the second air cleaner 23 and the intake bypass 4. Also, a selector valve 25 is provided on the combustion gas passage 16 on the lower course side of a heat exchanger 8, thereby, enabling switchover to a combustion gas passage 18 which is opened to the open air or to the combustion gas passage 16 which is connected to the intake pipe 3.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a vehicle heating system equipped with a heater that can operate independently of an engine.

[Conventional technology]

Conventionally, as a vehicle heating system, Japanese Patent Application Laid-Open No. 60-2520
18, Utility Model Application Publication No. 6159876, etc. are disclosed.

What is described in Japanese Unexamined Patent Publication No. 60-252018 will be summarized with reference to FIG. The automobile heating system shown in FIG. 5 includes a burner device 104 for burning fuel in an intake pipe 103 of an engine 101, and
A heat exchanger 105 is provided downstream of the burner device 10
The heat generated by burning the fuel in step 4 is transferred to the heat exchanger 105.
The recovered heat is used as a heat source for heating.

What is described in Japanese Utility Model Application Publication No. 611-59876 will be summarized with reference to FIG. The engine warm-up device shown in FIG.
and an intake pipe 3 that sequentially installs a heat exchanger 8 connected to a heater unit 9 of the vehicle, and further bypasses the intake detour 4.
A pressure regulating valve 12 is provided. The combustor 5 is connected to a fuel injection pump 10 attached to the engine 1 via a fuel vibro, and combusts fuel from a fuel tank 11 in the intake detour 4. Regarding heat exchanger 8,
The air outlet side thereof is connected to the heater unit 9 of the vehicle, and the warm air heated by heat exchange with the combustion gas of the burner having the vaporizer 7 flows into the heater unit 9. The downstream side of the heat exchanger 8 of the intake detour 4,
A check valve 15 such as a reed valve is installed on the upstream side of the confluence of the intake bypass path 4 with the intake pipe 3 to prevent intake air from the intake pipe 3 side from entering the intake bypass path 4 from the downstream side. Configure. A pressure regulating valve 12 is installed in a portion of the intake pipe 3 that bypasses the intake detour 4. This pressure regulating valve 12 is a pressure regulating valve 12
The pressure regulating valve 12 is installed to maintain a constant pressure difference between the front and rear intake pipes 3, and the pressure regulating valve 12 has an arm 12b attached to its rotation shaft 12a, and this arm 12b is inserted into the diaphragm 13a of the diaphragm type actuator 13. It is connected to the installed rod 13c. The spring chamber 13b of the actuator 13 is connected to a negative pressure sensor 14 installed in the intake pipe 3 on the downstream side of the pressure regulating valve 12 through a communication pipe 13d, so that the pressure on the downstream side of the pressure regulating valve 12 is introduced into the spring chamber 13b. Make it.

This engine warm-up device configured as described above operates as follows. Immediately after a cold start of the engine 1, the intake air flows through the intake detour 4 due to the action of the pressure regulating valve 12, so at this time, the burner of the combustor 5, that is, the vaporizer 7 is ignited to heat the intake air. The thus heated intake air warms the room heating air in the heat exchanger 8 and is introduced into the engine 1 through the intake manifold 2 to improve the warm-up performance of the engine 1. In this state, the pressure regulating valve 12 is connected to the negative pressure sensor 14.
It is driven by the actuator 13 in accordance with the detected pressure. That is, when the pressure on the downstream side of the pressure regulating valve 12 is low,
Since the pressure inside the spring chamber 13b becomes low, the diaphragm 1
3a expands toward the spring chamber 13b and draws the rod 13c into the actuator 13, and the pressure regulating valve 12 is slightly opened to allow a large amount of intake air to flow into the intake pipe 3 side, increasing the pressure on the downstream side of the pressure regulating valve 12, and vice versa. When the pressure on the downstream side of the pressure regulating valve 12 increases, the pressure in the spring chamber 13b increases, so the diaphragm 13a expands to the opposite side of the spring chamber 13b, pushes out the rod 13c from the actuator 13, and closes the pressure regulating valve 12. By slightly reducing the amount of intake air flowing through the intake pipe 3, the pressure on the downstream side of the pressure regulating valve 12 is lowered. Due to the above operation of the pressure regulating valve 12, the pressure difference between the inlet and outlet of the intake detour 4 is always maintained constant, so that the combustor 5 is not affected by changes in the amount of intake air due to changes in engine rotation. The burner does not blow out (burns stably).In addition, by providing a check valve 15 near the confluence with the intake pipe 3 on the outlet side of the intake detour 4, backfire of the engine 1 and intake pulsation can be prevented. The backflow of intake air caused by
It is possible to improve warm-up performance and achieve rapid room heating.

[Problems to be Solved by the Invention] However, in the automobile heating system and engine warm-up system as shown in FIGS. The combustion air that is introduced into the tube and sent to the combustor of the heater is taken in from the engine air cleaner.

In particular, in the engine warm-up device shown in FIG. 6, if combustion gas from the heat exchanger 8 is to be released into the atmosphere, the combustion gas will flow backwards because the pressure in the intake pipe 3 is lower than that in the combustion gas passage. There is a problem with this.

An object of the present invention is to solve the above problems, and when the combustion gas generated in the combustor of a heater is sent to the engine, relatively clean combustion air is sent to the combustor. To provide a vehicle heating device which takes in combustion air from a rough air cleaner with low suction resistance when releasing combustion gas to the atmosphere, reduces power consumption of a blower, and prevents backflow of combustion gas. It is.

[Failure to solve the problem]

In order to solve the above problems and achieve the above objects, the present invention is configured as follows.

That is, in the present invention, when the combustion gas generated in the heater consisting of the combustor and the heat exchanger is discharged into the intake pipe of the engine, combustion air is taken in from the first air cleaner for the engine, and the combustion gas is Regarding the vehicle heating system, which is characterized in that when the combustion air is discharged into the atmosphere, the combustion air is controlled to be taken in from the second air cleaner, which is rougher than the first air cleaner.
Communication between the first air cleaner or the second air cleaner and the combustor is performed by a switching valve, and a switching valve is installed in a combustion gas passage located downstream of the heat exchanger to direct combustion gas to the intake pipe or discharging to the atmosphere, and installing a blower in a combustion air intake passageway leading to the combustor;
The present invention relates to a heating device for a vehicle, wherein combustion gas from the heater is controlled to be released into the atmosphere when the engine is stopped.

[Effect]

The vehicle heating device according to the present invention is constructed as described above and operates as follows. That is, this invention:
When the combustion gas generated in a heater consisting of a combustor and a heat exchanger is discharged into the intake pipe of the engine, combustion air is taken in from the first air cleaner for the engine, and when the combustion gas is discharged to the atmosphere. Since the combustion air is controlled to be taken in from the second air cleaner, which is rougher than the first air cleaner, when the combustion gas is sent to the engine, the combustion air is taken in from the first air cleaner for the engine. The combustion air is relatively clean and does not contain any impurities, and does not have a negative effect on the engine, and when the combustion gas is to be released into the atmosphere, the combustion air is removed from the separately provided second air cleaner. Since there is no need to take in air and purify the air very much, the air cleaner filter can be rough and has low suction resistance, and the blower can be small with low power consumption.
Furthermore, combustion gas does not flow back from the combustion gas passage of the heater to the intake pipe of the engine. Communication between the first air cleaner or the second air cleaner and the combustor is performed by a switching valve, and since the switching valve is installed in the combustion gas passage located downstream of the heat exchanger, operation is reliable; The flow of combustion gas and combustion air can be controlled accurately and quickly. Furthermore, since the combustion gas is discharged into the intake pipe or the atmosphere, the heater can be operated regardless of whether the engine is operating.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a vehicle heating device according to the present invention will be described in detail below with reference to the drawings.

FIG. 1 shows a basic schematic diagram of a vehicle heating system which is an embodiment of the present invention.

This vehicle heating system has some parts that have the same configuration as the engine warm-up system described with reference to FIG. The explanation of the above will be omitted, and only the different configurations will be explained. A first air cleaner 24 for the engine is provided upstream of the intake pipe 3 of the engine 1. A switching valve 19 is installed at a branch point where the intake detour 4 is connected to the intake pipe 3, and a combustion air passage 17 of a second air cleaner 23 is connected to the intake detour 4. The switching valve 19 is switched to open and close communication between the intake pipe 3 and the intake detour 4 and between the combustion air passage 17 of the second air cleaner 23 and the intake bypass 4.

Furthermore, a blower 31 is installed on the intake detour 4.

A switching valve 2 is provided in the combustion gas passage 16 downstream of the heat exchanger 8.
5 is installed, and the switching valve 25 is switched to the combustion gas passage 18 that is open to the atmosphere or the combustion gas passage 16 that communicates with the intake pipe 3. In the figure, A indicates the flow direction of combustion air, B indicates the flow direction of combustion gas, F indicates the flow direction of fuel, and H indicates the flow direction of heating air in the vehicle.

2 and 3 show an example in which the vehicle heating device according to the present invention is applied to a vehicle together with its control device, and the heater is a rapid heating device QH.
3 is installed.

The rapid heating device QH3 is capable of rapidly heating a room by using a combustor and a heat exchanger, which will be described later.

Figure 2 is an overall schematic diagram including the control device;
The figure is an enlarged view of the main parts. Furthermore, the parts in the vehicle heating system shown in Figures 2 and 3 that are the same as those in the basic vehicle heating system shown in Figure 1 are given the same reference numerals. . The combustor 5 is configured to vaporize liquid fuel using a vaporization bag W7 to generate vaporized fuel, combust the vaporized fuel, and send combustion gas to the heat exchanger 8. Combustion air passage 17 that takes combustion air into the intake pipe 3 of the engine 1 and the combustor 5 of the heater
are connected to each other by an intake detour 4. intake pipe 3
A first air cleaner 24 for the engine is provided upstream of the engine, and this first air cleaner 24 has a function of making the air relatively clean. Further, a first air cleaner 2 is provided upstream of the combustion air passage 17.
A second air cleaner 23 having a different function from that of the second air cleaner 23 is provided. The second air cleaner 23 is made of a relatively rough or coarse filter, and has low air suction resistance, so the suction force of the blower 31 is also small, and the power consumption of the blower 31 is also low. .

A switching valve 19 is installed at a branch point between the intake bypass path 4 and the combustion air passage 17. In addition, in order to achieve the same function as the vehicle heating system shown in FIG.
In the vehicle heating system shown in the figure, a switching valve 25 for engine intake and a switching valve 27 for venting to atmosphere are opened and closed, and a switching valve 26 for engine heat retention and a switching valve 40 installed in a combustion gas passage 39 are operated. Set to closed state.

In the figure, 41 is an exhaust brake switching valve that dams the flow of exhaust gas and increases the braking force, and 43 is a valve that determines whether exhaust gas generated by the heater, that is, combustion gas, is sent to the intake pipe 3 of the engine 1. 44 is an activation switch for the rapid heating system QH3, 45. 47 is a temperature sensor, and 48 is a manually operated engine suction instruction switch for insulating engine 1 to keep it warm, such as the cylinder block and oil pan. 50 is the main control unit, 73 is a clutch on/off signal sensor that inputs clutch on/off signals, and 74 is a switch that indicates whether the accelerator is free or slightly depressed. 75 is a starter, 76 is a key switch such as an engine starter installed in the driver's seat, 77 is a silencer,
78 is an air tank that stores air compressed by the engine 1, etc., 79 is a temperature sensor that detects the temperature of heating air sent into the cab, 80 is a battery, 81 is a timer set by the user, and 82 is an exhaust brake. This figure shows the exhaust brake activation switch that provides activation input.

Next, although the details of the combustor 5 and the heat exchanger 8 are not shown, it is preferable to use one having the following configuration, for example. Examples of these will be explained in detail with reference to FIG.

First, the heat exchanger 8 will be explained. A blower 36 is installed upstream of the heat exchanger 8 through an air intake pipe. A suction duct 37 serving as a circulating air intake passage is attached to the suction port of the blower 36 . The suction duct 37 is configured to take in heating air from the interior 28 of the vehicle or from outside the vehicle, and may be configured to gradually become narrower toward the downstream, or may be a simple circulation pipe. good. Although not shown, the heat exchanger 8 may have a structure in which a heat absorption passage cylinder is arranged around the outer periphery of a heat flow passage cylinder, which is a double cylinder. The heat flow passage cylinder includes a heat flow outward passage cylinder and a heat flow return passage cylinder disposed around the outer circumference thereof. A combustor 5 is attached to one end of the heat flow outward cylinder. Therefore, the heat exchanger 8 has a heat flow path in the center through which the combustion gas from the combustor 5 passes, a heat transfer path in the middle to transfer the combustion heat of the combustion gas to the outer circumferential side, and a heat transfer path to radiate the combustion heat to the outside. It consists of heat absorption passages that turn cold air into hot air. Moreover, the heat flow passage, the heat transfer passage, and the heat absorption passage are arranged coaxially with each other. The heat absorption passage cylinder constitutes an outer case of the heat exchanger 8, and is covered with a heat insulating material or the like. At both ends of the outer case, an air intake pipe 21 is attached to one end and a bent pipe is attached to the other end, and the bent pipe is connected to a hot air blowing duct 22.

A cup-shaped lid with fins is fixed to the end of the heat flow return path cylinder. With this structure, the flow path for combustion gas, that is, the heat flow path and the heat transfer path, and the flow path for air, which undergoes heat exchange and is used for heating, or the heat absorption path are completely cut off.

Further, the other end of the heat flow outward passage cylinder and one end of the heat flow return passage cylinder are in communication with each other, and the other end of the heat flow return passage cylinder is provided with an exhaust pipe having a combustion gas outlet, that is, a combustion gas exhaust pipe. aisle 16
is installed. This combustion gas is configured to be sent to the intake pipe 3 of the engine 1, to the outer periphery of the engine 1 or to an appropriate location to keep the engine 1 warm, or to be released to the atmosphere. Further, a large number of heat receiving fins are arranged on the heat flow return path cylinder. Further, a large number of heat radiation fins are arranged in the heat absorption passage cylinder. The heat receiving fins and the heat dissipating fins are preferably provided integrally with the heat flow return path cylinder from the viewpoint of heat conduction. In other words, heat receiving fins are formed inside the heat flow return path cylinder, and heat radiation fins are formed outside the heat flow return path cylinder.

Next, the combustor 5 will be explained. The combustor 5 consists of a combustion tube, the combustion tube is divided into a vaporization chamber and a combustion chamber by a partition plate having a communication hole, and a vaporization device 7 having a built-in glow plug 30 for vaporization is arranged to penetrate the combustion chamber. A jet port for spouting the vaporized fuel vaporized by the vaporization device 7 is opened in the vaporization chamber, and an ignition glow plug 29 is installed in the vaporization chamber. The vaporizing glow plug 30 vaporizes liquid fuel into vaporized fuel, takes in combustion air to generate vaporized fuel and an air-fuel mixture, and ignites the slight amount of oil droplets or air-fuel mixture.
The mixture is ignited and combusted in the combustion chamber. By using such a combustor 5, the liquid fuel is rapidly vaporized into vaporized fuel, and the vaporized fuel is quickly ignited, allowing rapid combustion. As a result, the combustor 5 can immediately send combustion gas to the heat exchanger 8, and the function of the heat exchanger 8 can be quickly performed.
It can be used for heating.

The vehicle heating system according to the present invention is constructed as shown below and operates as follows. Regarding the operation of this vehicle heating system, first, basic operating conditions will be explained. The vehicle heating system shown in FIG. 1 has a switching valve 19 so that the heater consisting of a combustor 5 and a heat exchanger 8 can be operated independently even when the engine 1 is stopped.
and a switching valve 25. The calorific value, that is, the combustion gas obtained in the combustor 5 is sent to the heat exchanger 8, and after heat exchange, it is sent through the combustion gas passage 16 to the intake pipe 3 of the engine 1 or the combustion gas passage 1B that is open to the atmosphere. It is composed of First, when the engine 1 and the heater are operating at the same time, and when the combustion gas generated in the combustor 5 of the heater is to be sucked into the engine 1, the switching valve 19 and the switching valve 25 are connected to the intake pipe 3. control to switch to the open side. In this state, the combustion gas flows smoothly by controlling the pressure regulating valve 12 and the diaphragm actuator 13 regardless of the operating state of the blower 31. Further, even when the engine 1 is stopped, the switching valve 19 is opened to the intake pipe 3, the switching valve 25 is closed to the intake pipe 3, and is opened to the combustion gas passage 18 which is open to the atmosphere. to control. In this state, blower 3
Due to the action of No. 1, the combustion gas flows smoothly into the atmosphere.

However, if the engine 1 is operated and the switching valve 19 is controlled to open to the intake pipe 3 and the switching valve 25 is controlled to close to the intake pipe 3 and open to the combustion gas passage 18 communicating with the atmosphere. For example, the suction negative pressure in the intake pipe 3 is, for example, 650 mmAq, and therefore, unless a blower 31 with a considerably large capacity is used, there will be a problem that combustion gas will flow backwards. In order to solve this problem, the vehicle heating device according to the present invention performs the following control. That is, when the engine 1 and the heater are operating at the same time, the direction in which the switching valve 25 is opened and the engine 1
Detects the rotation status of When a signal indicating that the engine 1 is rotating and the switching valve 25 is open to the atmosphere is obtained from these signals, the switching valve 19 is closed to the intake pipe 3 and the second air cleaner 23 side is opened. to control. The second air cleaner 23 is the first air cleaner 2
4, the suction resistance of the blower 31 is small, and the suction resistance of the blower 31 is lower.
itself can be made smaller.

Therefore, the power consumption of the blower 31 can be reduced. In addition, as another control of the heater, the operation of the switching valve 19 is performed by detecting the rotation of the switching valve 25 and the engine 1, and the negative pressure level in the intake pipe 3 is sensed to control the operation of the switching valve 19, which is set in advance. It is also possible to control the switching valve 19 to switch to the second air cleaner 23 by comparing the suction capacity of the blower 31 currently installed.

Regarding the vehicle heating system according to the present invention, the operating conditions of each switching valve 19, 25 under each operating condition are shown below as a typical example.

(1) When starting the engine 1 in the summer, when only the engine 1 is operated without assistance from the rapid heating device QH3, the pressure regulating valve 12 is fully opened and the switching valve 19 is closed.

(II) When starting the engine 1 in winter, if the rapid heating device QH3 is assisted and combustion gas is sucked into the engine 1 by idling the engine 1, etc.
Open the switching valve 19 and the switching valve 25.

(III) When the engine 1 is stopped and the rapid heating device QH8 is operated independently, the switching valve 19 is opened, the switching valve 25 is closed, and the combustion gas passage 16 is connected to the combustion gas passage 18 to the atmosphere side. Open.

(■) When operating the engine 1 and operating the rapid heating device QH8 independently, the switching valve 19 and the switching valve 25
is closed, combustion air is taken in from the second air cleaner 23, and the combustion gas passage 16 is communicated with the combustion gas passage 18 to be opened to the atmosphere.

(V) When the rapid heating system QH3 is in operation and the engine 1 is operating the exhaust brake, the switching valve 1
9 is closed, the switching valve 25 is opened, and combustion gas is sent into the intake pipe 3.

Next, the rapid heating device Q shown in FIGS. 2 and 3
The operation of the vehicle heating system according to the present invention equipped with H3 will be explained. Further, the processing status of the operation will be explained with reference to the flowchart shown in FIG.

First, the vehicle heating system according to the present invention will be started.

-------------(51
) Determine whether the activation switch 56 of the rapid heating device QH3 in the vehicle heating system consisting of the combustor 5 and the heat exchanger 8 is on. If the activation switch 56 is not on, the process returns to the beginning. If the activation switch 56 is on, the process advances to the next process (53). −
-------1------・-(52) The air in the air cylinders for each pulp type is not activated, and only the heater of the rapid heating device QH3 is set to be able to operate independently. has been done.

It controls various combustion-related parts of the rapid heating device QH3, such as the blowers 31 and 36, the vaporizing glow plug 30, the ignition glow plug 29, and the liquid fuel pump 32. The liquid fuel pump 32 is operated to send liquid fuel from the liquid fuel tank 11 to the vaporizer 33. By operating these, liquid fuel is supplied to the combustor 3 and converted into vaporized fuel.

The blower 31 is operated to send combustion air to the combustor 5. The combustor 5 vaporizes liquid fuel to generate vaporized fuel, and enters a combustion state.

By turning on various combustion-related parts of the rapid heating system WQH3,
The liquid fuel is vaporized to become vaporized fuel, and the combustion gas outlet of the heat exchanger 8, that is, the combustion gas passage 16, determines whether or not the liquid fuel has ignited.
A temperature sensor 34 installed at the inlet of the combustion gas detects and judges the temperature of the combustion gas. For example, it is determined whether the temperature of the combustion gas is about 200° C. or higher. If ignition has not occurred, the process (53) is performed. If ignited, proceed to the next process (55).

(54) Determine whether or not to cause the engine 1 to suck combustion gas. When the combustion gas is to be sucked into the engine 1, the engine intake instruction switch 43 for causing the engine 1 to suck the combustion gas is turned on. Engine intake instruction switch 43
If it is on, the process proceeds to the next process (56), and if it is not on, the process proceeds to process (66). --------
----(55) When the combustion gas is to be sucked into the engine 1, the switching pulp 25 for engine suction is opened.

------------ (56) Switch the switching valve 19 to the side where the intake detour 4 opens to the intake pipe 3, that is, the position shown by the solid line in FIG. 3, and switch the switching valve 19 to the second air cleaner 23 side will be closed.

・−・−・−−−−−(57) Close the engine heat retention switching valve 26 and the atmospheric release switching valve 27.

------- (5B) Determine whether the exhaust brake activation switch 70 is on. If the exhaust brake actuation switch 70 is on, the process proceeds to the next process (60), and if it is off, the process returns to the previous process (56).

------------(59) Determine whether the clutch is on. If the clutch is on, the clutch signal sensor 73 is turned on. If the clutch is not on, the process returns to before the process (56).
-------m---- (60) Accelerator signal sensor 74 detects whether the accelerator is free or depressed.
Judge by the signal. If the accelerator is free, the process proceeds to the next process (62), and if the accelerator is not free, the process returns to the previous process (56). −−−−m−−・−−
--- (61) Open the switching valve 27 for opening to the atmosphere,
Release combustion gases to the atmosphere. −1−−−−・−
--(62) Close the engine intake switching valve 25 to prevent combustion gas from being sent into the intake pipe 3 of the engine 1. −1−−−−−・−−−−
- (63) Switch the switching valve 19 to the side where the intake detour 4 is closed to the intake pipe 3, that is, the position shown by the dotted line in FIG. Combustion air is taken in from the second air cleaner 23. ------- (64) Close the discharge brake pulp 41 and the sound muffling pulp 42 for preventing blowback when the discharge brake is activated. −
----------- (65) Here, various controls are performed by the driver.

Next, it is determined whether the operation switch 44 of the rapid heating device QH3, which includes the combustor 5, heat exchanger 8, etc., is off.

If the activation switch 44 is not off, the process (55) is performed.
), and if the activation switch 44 is off, the process proceeds to the next process (67).

------------ (66) Controls the extinguishing-related devices of the rapid heating device QH3 in the vehicle heating system, and extinguishes the rapid heating device QH3.
----------・-・---- (61) Switch the switching valve 19 to the side where the intake detour 4 is closed to the intake pipe 3, and connect the rapid heating device QH3 and the intake pipe 3 of the engine 1. Cut off.

Open the switching valve 27 for venting to the atmosphere.

The switching valve 26 for keeping the engine warm is closed.

The switching valve 25 for engine intake is closed.

The control of the rapid heating device QH3 in the vehicle heating device ends. −−−−1−−−・−−−−−−(
72) Also, when operating the rapid heating device QH3,
For example, if the combustor 5 and heat exchanger 8 described above are used, the operation will be as follows. Combustion gas generated by the combustor 5 is blown into a heat flow path within the heat flow outward cylinder. The combustion gas blown into the heat flow passage is guided by the lid from the heat flow passage of the heat flow outward cylinder, makes a U-turn, and flows through the heat transfer passage in the heat flow return cylinder. Since a large number of heat receiving fins are installed in the heat transfer passage in the radial direction, combustion heat is removed from the combustion gas by the heat receiving fins, and finally the combustion gas is discharged from the combustion gas outlet to the combustion gas passage 16. On the other hand, the air to be warmed is sucked from the suction duct 37 by the blower 36, and is blown from the blower 36 into the heat absorption passage cylinder of the heat exchanger 8. The injected air is
It flows between the heat dissipation fins installed in the heat absorption passage. In the heat absorption passage, a large number of radial heat dissipation fins are fixedly arranged on the outer periphery of the heat flow return path cylinder, and air passes between the heat dissipation fins and absorbs heat from the heat flow fins. It's warm. The warmed air becomes hot air, and then passes through a large number of radiating fins provided in the radial direction around the outer circumference of the lid body to be further warmed and flows. Next, the heated air passes through the hot air blowing duct 22 and is blown out from the hot air blowing outlet 38 into the vehicle interior 28. The warm air keeps the inside of the vehicle warm, and then passes through a filter at the air intake port and is drawn into the suction duct 37 by the action of the blower 36.

The sucked air is sent from the scroll outlet 2 of the blower 36, that is, the air intake pipe, to the heat exchanger 8 through the air intake pipe again. The above operation is repeated to keep the interior of the vehicle at a predetermined temperature.

Although one embodiment of the vehicle heating device according to the present invention has been described in detail, the present invention is not limited to the detailed structure described above. That is, it goes without saying that various configurations can be applied to the combustor and heat exchanger. For example, the combustor may be one that uses a glow plug, which is a heating plug, to vaporize liquid fuel into vaporized fuel and ignite it, and can be of a vertical type, a horizontal type, or the like. The design of the heat exchanger can also be changed in various shapes and structures, as well as in the shape and structure of the fins incorporated therein.

〔Effect of the invention〕

Since the vehicle heating device according to the present invention is configured as described above, it has the following effects.

That is, in the present invention, when the combustion gas generated in the heater consisting of the combustor and the heat exchanger is discharged into the intake pipe of the engine, combustion air is taken in from the first air cleaner for the engine, and the combustion gas is When the combustion gas is released into the atmosphere, the combustion air is controlled to be taken in from the second air cleaner, which is rougher than the first air cleaner, so when the combustion gas is sent to the engine, the combustion air is taken in from the first air cleaner. If the combustion air taken in from the air cleaner is relatively clean and free of impurities and will not adversely affect the engine, and the combustion gases are released to the atmosphere,
Combustion air is taken in from a second air cleaner installed separately, and there is no need to purify the air so much that the air cleaner filter can be rough and have low suction resistance, and the blower can be a small one with low power consumption. Moreover, combustion gas does not flow back from the heater's combustion gas passage to the engine's intake pipe. Communication between the first air cleaner or the second air cleaner and the combustor is performed by a switching valve, and since the switching valve is installed in the combustion gas passage located downstream of the heat exchanger, operation is reliable; The flow of combustion gas and combustion air can be controlled accurately and quickly. Since the combustion gas is discharged into the intake pipe or the atmosphere, the heater can be operated regardless of whether the engine is operating. The combustion gas generated in the combustor is sent to the engine or to the exhaust pipe of the engine, which is extremely preferable in terms of safety. Moreover, the passage for taking in the combustion air of the heater is connected to the intake pipe of the engine, and a switching valve is simply installed, so the structure is extremely simple, the operation is extremely simple, and there is no risk of failure. It has various effects such as being less likely to cause problems and easy to maintain.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing the basic device of the vehicle heating system according to the present invention, Fig. 2 is a schematic diagram showing an embodiment of the structure of the vehicle heating system and its control device according to the present invention, and Fig. 3 The figure is an enlarged view of the main part of FIG. 2, FIG. 4 is a flowchart explaining the operating state of the vehicle heating system according to the present invention, and FIG. 5 is a schematic diagram showing the conventional vehicle heating system.
FIG. 6 is a schematic diagram showing a conventional engine warm-up device. 1------Engine, 3---Intake pipe, 4------
---Intake detour, 5--------Combustor, 7-----
Vaporizer, 8-------Heat exchanger, 16, 39-
- Combustion gas passage, 19, 25. 26, 27, 40,
41.42-1------Switching valve, 23------
2nd air cleaner, 2.1 - - - - 1st air cleaner, 2 B - - Vehicle interior, 29 - - - Ignition globe lug, 30 - - Ignition globe lug, 3
1, 36---Blower, 50---Main controller. 3] Figure 4 Figure 5

Claims (6)

[Claims] (1) When the combustion gas generated in the combustor of the heater is sent to the intake pipe of the engine, the combustion air is taken in from the first air cleaner for the engine, and when the combustion gas is released to the atmosphere, A heating system for a vehicle, characterized in that combustion air is controlled to be taken in from a separate second air cleaner. (2) The vehicle heating system according to claim 1, wherein the second air cleaner is made of a rougher filter than the first air cleaner. (3) The vehicle heating system according to claim 1, wherein communication between the first air cleaner or the second air cleaner and the combustor is performed by a switching valve. (4) A switching valve is installed in the combustion gas passage located downstream of the heat exchanger of the heater, and the combustion gas is sent into the intake pipe or released into the atmosphere. The vehicle heating device according to item 1. (5) The heating device for a vehicle according to claim 1, characterized in that a blower is installed in a combustion air intake passage leading to the heater. (6) The vehicle heating device according to claim 1, wherein the combustion gas of the heater is controlled to be released into the atmosphere when the engine is stopped.