JPH07115581B2 - Vehicle heating system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Field of Industrial Application) The present invention relates to a vehicle heating device that can be used as a heating device for a heating / hot water circuit of a water-cooled or air-cooled automobile.

(Prior Art) As a warm-up device for raising the water temperature by exchanging heat between high-temperature exhaust gas and cooling water in order to improve the capacity of a heating system for an automobile, there is a conventional Japanese Utility Model Publication No. Sho 59-121476 (No. 59-121476). A heat pump shown in FIG. 3) and a heat exchanger shown in Japanese Utility Model Laid-Open No. 61-17317 are proposed. Here, an example using a heat pump will be described with reference to FIG. In the heat pump of FIG. 3, one end constitutes a heat absorbing portion by the heat absorbing fin 52a arranged in the exhaust gas passage 51 of the engine, and the other end constitutes a heat radiating portion by the heat radiating fan 52b arranged in the cooling water passage 53. The heat pump device 52 is provided.

(Problems to be Solved by the Invention) However, in the heat pump device of FIG. 3, there is a problem of its size and clogging of the heat absorbing fins 52a. That is, when using the exhaust gas, the thermal conductivity of the gas is usually several tenths of that of the liquid. Therefore, the only way to compensate the efficiency is to increase the heat transfer area. However, if the exhaust passage is narrowed due to this, the back pressure of the engine becomes high, causing a problem of output reduction or engine malfunction, and in the worst case, there is a drawback that the passage is closed due to clogging.

Therefore, since it is necessary to eliminate this defect, there is a problem that the size of the exhaust side heat transfer section of the conventional apparatus of this type becomes considerably large, which makes mounting difficult. In addition, when the vehicle is running at low load, the exhaust temperature itself is low, so even if heat exchange is performed, the capacity may still be insufficient.

The present invention aims to provide a heating device for a vehicle that is efficient and can be made compact by using a heat generator that uses heat generated by shearing due to a liquid-tight gap between a rotor and a rotating body. .

[Structure of Invention]

(Means for Solving the Problems) Therefore, according to the present invention, rotation control is performed via a clutch mechanism that is interlocked with an automobile engine and is turned on when the engine temperature is below a set value and turned off when the engine temperature is above the set value. A shaft fixed to an engine and rotatably supporting one end of the shaft, a rotor fixed to the other end of the shaft, a rotor rotatably supported by the shaft and rotatably including the rotor, and A rotating body having a liquid-tight gap, to which rotation is transmitted from the rotor via a viscous fluid sealed in the gap, and fixed to the rotating body to give resistance to rotation of the rotating body, And a rotor that generate relative energy between them to generate thermal energy, the impeller and the rotating body are included, and a passage for circulating water is formed around the impeller, and the inlet and outlet of the circulating water are formed. It is composed of a housing having a mouth port, which serves as a means for solving the problem.

(Operation) When the heater-on switch is turned on by the operation of the driving vehicle, the circulating water passes through the heater circuit, and the water temperature sensor, the heat generator,
It flows to the water pump through the heater radiator. Here, when the water temperature sensor detects that the cooling water temperature is equal to or lower than the set value, a signal for turning on the clutch mechanism is output from the control device, and the heat generator starts to operate. That is, when the engine temperature is low, the rotation of the engine is transmitted to the rotor via the shaft, the rotational resistance of the viscous fluid in the liquid-tight gap is large, and the rotor makes relative rotation as the rotor rotates, and is attached to the rotor. The impeller rotates in the circulating water passage in the casing to agitate the circulating water and carry out water circulation, and the viscous fluid generates shearing heat between the liquid-tight gaps. The heat energy generated by the shearing heat is transmitted to the circulating water outside the rotating body, and the heat of the circulating water is radiated from the heater radiator into the passenger compartment. Next, when the engine temperature becomes equal to or higher than a predetermined value, the rotation transmission from the rotor to the rotating body is weakened, the drive circuit torque of the rotor is also reduced, the crack mechanism is turned off, and the heat generator stops generating heat.

(Embodiment) The present invention will be described below with reference to an embodiment of the drawings, and FIGS. 1 and 2 show an embodiment of the present invention. First, FIG. 1 shows a case of a water-cooled type, in which 10 is a vehicle heating system, 11 is an engine, 12 is a water pump, and cooling water for cooling the engine 11 is circulated by the action of the water pump 12. 13
It is moving inside. The thermostat 15 controls the cooling water to flow to the bypass circuit 16 when the water temperature is lower than the predetermined value, and to the radiator 14 when the water temperature is higher than the predetermined value. Reference numeral 17 is a main fan for cooling the radiator 14, and 18 is a belt for transmitting power from a crankshaft (not shown) to the water pump 12.

Here, when the heater is switched on by the driver's operation, the heater valve 20 is opened and the cooling water flows in the heater circuit.
It flows through the water temperature sensor 21, the heater 22, the heater radiator 44, and the water pump 12. When the cooling water passes through the heater radiator 44, heat is released to the outside air by the sub fan 45, but when the water temperature is low, the amount of heat radiation is small and the efficiency of the heater is poor. Therefore, when the heater valve 20 is opened and the water temperature sensor 21 detects that the water temperature is equal to or lower than the set value, the control device 42 outputs a signal to turn on the electromagnetic clutch 29, and the heat generator 22 starts operating. In the case of the air-cooled engine, only the circulating water passage passing through the heater radiator 44 and the heat generator 22 and not the engine cooling water passage passing through the radiator 14 are provided.

Next, details of the heat generator 22 and the electromagnetic clutch 29 are shown in FIG. First, the electromagnetic clutch 29 will be described. When the clutch 29 is off, even if the input pulley 26 is rotationally driven by the belt 18, the output disk 28 and the shaft 25
The driving force is not transmitted to. At this time, when a signal from the control signal 42 is received, a current flows through the coil 24 to be excited, and the input pulley 26, the output disc 28, and the shaft 25 start rotating integrally via the plate 27. Reference numeral 23 denotes a body which is fixed to the engine 11 and rotatably supports the shaft 25 via the output disk 28.

Explaining the heat generator 22, a so-called viscous fluid coupling is rotatably supported at the tip of the shaft 25. Around the viscous fluid coupling, the housing 30, 31
A heat receiving chamber (cooling water passage) 39 is formed, and the housings 30 and 31 are integrally fixed by bolts 32 and are also fixed to the engine by bolts (not shown).

The viscous fluid coupling is a rotor 33, and a cover 34 and a casing 35 that constitute the rotating body of the present invention that contains the rotor 33.
The cover 34 and the casing 35 are integrally fixed by a bolt 36. The labyrinth groove 33a of the rotor 33 and the labyrinth groove 35a of the casein 35 face each other with a liquid-tight gap, and a viscous fluid (such as silicon oil) is sealed in the gap to transmit torque. That is, the rotational drive of the shaft 25 is transmitted from the rotor 33 to the cover 34 and the casing 35 through the viscous fluid.
Further, an impeller 38 is fixed to the cover 34 by a bolt 37, and when the impeller 38 rotates in the heat receiving chamber 39, it receives a resistance of water. This resistance prevents the rotating body of the casing 35 of the cover 34 by the rotor 33 from rotating around as a unitary rotation.However, since the rotating resistance of the viscous fluid is large at low temperature, the rotor 33 and the rotating body are prevented from rotating. Producing relative rotation, the viscous fluid produces shear insulation between the liquid-tight spaces.
This heat energy is given to the cooling water in the heat receiving chamber 39 through the cover 34 and the casing 35. The cooling water in the heat receiving chamber 39 is agitated by the impeller 38 and is subjected to a water supply circulation action, and is supplied to the water pump 12 and the heater circuit via the inlet port 40 and the outlet port 41. Therefore, the heat generated in the heat generator 22 is released into the passenger compartment of the automobile through the heater radiator 44. Incidentally, instead of the labyrinth structure, one gear is fixed to the shaft 25, the other gear is rotatably supported as an internal gear provided in the cover body, and a viscous fluid is sealed between the meshing teeth of both gears. The gear pump mechanism can be also used.

Here, if the water temperature exceeds a predetermined value, the temperature of the viscous fluid also rises, the transmission of rotation from the rotor 33 to the rotating body is weakened, the electromagnetic clutch 29 is turned off, and the heat generator 22 stops generating heat. The heat generation capacity of this device can be preset by the viscosity coefficient of the viscous fluid. The clutch is not limited to the electromagnetic clutch 29 shown in FIG. 2, and may be a general clutch mechanism such as a multi-plate hydraulic clutch, a pneumatic clutch, a viscous fluid clutch, a dry clutch, or the like.

〔The invention's effect〕

As described above in detail, since the heat generator of the present invention uses liquid-liquid heat exchange using a viscous fluid, it has higher thermal efficiency and is more compact than conventional gas-liquid exhaust heat exchangers. It is also possible to configure the device as described above, and there is no concern about clogging due to exhaust. Further, since the engine is rotating even when the vehicle is traveling under a low load, heat can be generated from the heat generator via the shaft. Further, since the engine cooling water in the housing is circulated by the impeller fixed to the rotating body, the size of the water pump for circulating the engine cooling water can be reduced. Further, in the present invention, since heat generation by the viscous fluid is added as compared with the case where only the exhaust gas temperature of the engine is used, it is only necessary to set the temperature to, for example, 40 ° C. at the time of start-up, which is half the time of the conventional case.

[Brief description of drawings]

FIG. 1 is a circuit diagram of a vehicle heating device showing an embodiment of the present invention, FIG. 2 is an enlarged cross-sectional view of a main part of FIG. 1, and FIG. 3 is a circuit diagram of a conventional engine warm-up device. Description of main parts of the figure 11 …… Engine, 12 …… Water pump 13 …… Circuit path, 14 …… Radiator 18 …… Belt, 19 …… Heater circuit 21 …… Water temperature sensor, 22 …… Heating device 23 …… Body, 24 ... Coil 25 ... Shaft, 26 ... Input pulley 29 ... Electromagnetic clutch, 30, 31 ... Housing 33 ... Rotor, 34 ... Cover (rotating body) 35 ... Casing (rotating body) 38 ...... Impeller 39 …… Heat receiving chamber (engine cooling water passage) 40 …… Inlet port, 41 …… Outlet port 42 …… Control device, 44 …… Heater radiator

Claims (1)

[Claims] 1. A shaft which is rotationally controlled via a clutch mechanism which is interlocked with an automobile engine and which is turned on when the engine temperature is below a set value and turned off when the engine temperature is above the set value.
A body fixed to the engine and rotatably supporting one end of the shaft, a rotor fixed to the other end of the shaft, and a rotor rotatably supported by the shaft rotatably included therein and liquid-tight with the rotor. A rotor having a gap, the rotation of which is transmitted from the rotor through a viscous fluid sealed in the gap, and a rotor fixed to the rotor to give a resistance to the rotation of the rotor and the rotor and the rotor. And a housing that encloses an impeller and a rotating body that generate relative energy between them to generate heat energy, forms a circulating water passage around the impeller, and has an inlet port and an outlet port of the circulating water. A vehicle heating device characterized by the above.