JPH08113027A - Air-conditioner - Google Patents

Abstract

PURPOSE: To provide an air-conditioner which can control the blowoff tempera ture and the blowoff air quantity. CONSTITUTION: Since a control device 41 to receive output of a temperature sensor 43 provided in an outlet part of a combustion heater 21 outputs a signal to adjust a fuel quantity and an air quantity to be supplied to the combustion heater 21 to a metering pump 38 and a motor 34 of a fan 33, a temperature of hot air after passing through the combustion heater 21 in a main duct 15 can be held at a temperature of a prescribed range. An air quantity flowing in a duct 1 is adjusted by a temperature control door 20, and when a temperature of hot air after passing through a heat exchanging fin 36 in the main duct 15 is held at a temperature of a prescribed range, a blowoff temperature of blowoff hot air can be controlled by a joining part of the main duct 15 and a bypass duct 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner, and more particularly, to an air flow rate adjusting an air flow rate ratio between an air flow path for guiding air to a combustion type hot air heater and an air path for bypassing the air heater. The present invention relates to a vehicle air conditioner having an adjusting means.

[0002]

2. Description of the Related Art As prior art, US Pat. No. 4,688,71
There is publication No. 8. In this heater, a single duct connects the indoor blowout air inlet to the blowout outlet, and the combustion air fan and the warm air blowing fan are driven by the same motor. The blown air volume is determined by the intake air temperature and the heat radiation amount of the heater. In this publication,
Although it is possible to simplify the connection duct from the suction port of the indoor blown air to the blowout port, a technique for controlling the blowout temperature and the blown air volume is not disclosed.

[0003]

In this conventional heating machine, the combustion air fan and the warm air blowing fan are driven by the same motor, so that the motor speed matches the fuel consumption of the heating machine. It is controlled by the speed of the combustion air fan. In such a conventional heater, a technique that enables blowout temperature control is not disclosed, and a technique that controls the blown air volume is not disclosed.

An object of the present invention is to provide an air conditioner capable of controlling blowout temperature and blown air volume.

[0005]

According to a first aspect of the present invention, an air conditioner according to the present invention is a heater system having a combustion heater having a heat exchanger and a blower, and is a blower blower provided at an inlet side of a duct. Blower, a branching part that branches from the middle of the duct into a main duct and a bypass duct, a merging part that joins the branched bypass duct outlet side to the main duct outlet side, and a heat exchanger provided in the main duct. A combustion type heater having an exchanger; and an air volume adjusting means capable of adjusting an air volume ratio of the main duct and the bypass duct, wherein hot air after passing through the heat exchanger in the main duct and after passing through the bypass duct It is characterized in that it is mixed with cold air.

An air conditioner according to a second aspect of the present invention includes a mixer having a plurality of injection holes in a passage portion where the hot air after passing through the heat exchanger and the cool air after passing through the bypass duct meet. And An air conditioner according to claim 3, wherein the temperature sensor provided at the outlet of the heat exchanger, and a control for receiving a signal from the temperature sensor and outputting a signal for adjusting the amount of fuel and the amount of air supplied to the combustion heater. And a device.

[0007]

According to the air conditioner of the first aspect of the present invention, it is possible to control the amount of blown air by the blower and blower fan that is separate from the combustion air fan that supplies the combustion air to the combustion heater. Further, by adjusting the air volume flowing through the main duct by the air volume adjusting means, and maintaining the temperature of the hot air after passing through the heat exchanger in the main duct within a predetermined range of temperature,
The temperature at which the hot air blows out can be controlled at the confluence of the main duct and the bypass duct. Thereby, the blowout temperature and the blown air volume are controlled.

According to the air conditioner of the second aspect, since the mixer having the injection holes is provided at the confluence of the main duct and the bypass duct, the hot air from the main duct and the cool air from the bypass duct are made uniform. It can be diffused and mixed to generate hot air having a desired temperature. According to the air conditioner of claim 3, the control device receiving the output of the temperature sensor provided at the outlet of the heat exchanger outputs a signal for adjusting the amount of fuel and the amount of air supplied to the combustion heater. The temperature of the hot air after passing through the heat exchanger can be maintained within a predetermined range. Therefore, it is possible to control the blowing temperature of the blowing hot air at the confluence of the main duct and the bypass duct.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. The heater is provided with inlets 2 and 3 for guiding outside air (outside air) or inside air (inside air) on the inlet side of the duct 1, and an inside / outside air switching damper 4 that switches between opening and closing of the inlets 2 and 3. Is provided. A blower / blower fan 12 rotated by a blower motor 11 is provided on the outlet side of the inside / outside air switching damper 4, and the blower / blower fan 12 is provided.
The outside air or the inside air from the inlet 2 or 3 to the duct 1
The air is sucked in, and the sucked air is sent to the outlet side of the duct 1. A defrost outlet 5, a face outlet 6, and a foot outlet 7 are formed on the outlet side of the duct 1, and these outlets 5,
Opening / closing dampers 8, 9 and 10 are rotatably provided on 6 and 7, respectively.

In the middle of the duct 1, there is a branch portion 17 that branches into a main duct 15 and a bypass duct 16 that bypasses the main duct 15. The outlet of the main duct 15 is the outlet of the bypass duct 16. They join at the merging section 18. A temperature control door 20 is rotatably attached to the branch portion 17 and is capable of adjusting an air volume ratio between the air volume flowing to the main duct 15 and the air volume flowing to the bypass duct 16. A combustion heater 21 is provided in the middle of the main duct 15 to heat the cold air flowing through the duct. A mixer 22 is provided at the merging portion 18 at the outlet of the main duct 15.

In the fuel supply system 31, the fuel in the fuel tank 37 passes through the metering pump 38 and the fuel pipe 39.
Is introduced into the combustion heater 21. Air supply system 32
The external combustion air is introduced into the combustion heater 21 from the intake pipe 30 by the fan 33. The combustion heater 21 is
Fuel and air supply system 3 supplied from the fuel supply system 31
The mixture with the air supplied from 2 is burned, and the heat of this combustion gas is used as a heat source to heat the cold air introduced from the upstream side of the combustion heater 21 to make it warm. The combustion heater 21 introduces and combusts a motor 34 that rotates a fan 33 that sucks in combustion air, and a mixture of combustion air supplied by the fan 33 and fuel supplied from a metering pump 38, and burns the mixture. The chamber 35 and the heat exchange fins 36 for transferring the heat generated in the combustion chamber 35 to cold air are provided. The exhaust gas from the combustion chamber 35 is exhausted to the outside through the exhaust pipe 39.

The cold air passing through the outside of the combustion heater 21 takes heat from the heat exchange fins 36 to rise in temperature and is discharged as warm air from the outlet side of the combustion heater 21. This warm air is supplied to the outlet of the main duct 15 at the confluence section 18
In the mixer 22, the mixture is mixed with the cold air flowing from the bypass duct 16 side to have an appropriate temperature and is blown into the vehicle compartment from the defrosting outlet 5, the face outlet 6, or the foot outlet 7. The mixer 22 is cylindrical and has a large number of holes formed in a wall forming the cylinder, and hot air is discharged from the holes to the outside, that is, the inside of the duct.

The control system uses the metering pump 3 according to a command from the control device 41 having a CPU, a ROM and a RAM.
8 and the fan 33 of the combustion heater 21 are controlled. The input signal of the controller 41 is the temperature sensor 4 provided on the outlet side of the combustion heater 21.
3 is an electric signal generated. The control device 41 stores the temperature sensor signal, performs arithmetic processing, and as a result of the processing, generates a drive signal for controlling the rotation speeds of the metering pump 38 and the fan 34. The temperature sensor 43 is provided near the hot air outlet of the combustion heater 21 at a position where the hot air hits. The temperature control door 20 is connected to the main duct 15
The structure is such that the air volume ratio of the air volume supplied to the bypass duct 16 and the air volume supplied to the bypass duct 16 is adjusted.

Next, the operation of this embodiment will be described.
The fuel in the fuel tank 37 is metered by the metering pump 38 and passes through the fuel pipe 39 to the combustion heater 2
1 and is vaporized in the combustion heater 21. The combustion air is supplied from the intake pipe 30 into the combustion heater 21 by the fan 33 rotated by the motor 34, mixed with the vaporized fuel and burned in the combustion chamber 35. This combustion gas is discharged as an exhaust gas to the outside of the combustion heater 21 through the exhaust pipe 39.

The heating air as the outside air or the inside air is introduced into the duct 1 by the fan 12 rotated by the blower motor 11, and a part of the cool air sent from the fan 12 is blown by the temperature control door 20 into the main duct 1.
5, the remaining cool air sent from the fan 12 is supplied to the bypass duct 1 by the temperature control door 20.
6 is sent. The cool air flowing through the main duct 15 is guided to the combustion heater 21, exchanges heat with the combustion gas by the heat exchange fins 36, becomes hot air, passes through the outlet-side main duct 15b, and is discharged from the mixer 22 to the confluence portion 18 in the duct 1. To be done. On the other hand, the cool air flowing through the bypass duct 16 is mixed with the warm air discharged from the mixer 22 at the merging portion, and the duct 5
It is blown out from each blower outlet 5, 6 or 7 via 2.

Therefore, by adjusting the opening degree of the temperature control door 20, it is possible to adjust the ratio of the amount of air introduced to the main duct 15 and the bypass duct 16, whereby the temperature of the air blown from each of the air outlets 5, 6 or 7 can be adjusted. Can be controlled. In addition, by controlling the rotation speed of the fan 12, it is possible to control the amount of air blown from the air outlet 5, 6 or 7.

The control device 41, which receives the signal generated by the temperature sensor 43, includes a metering pump 38 and a motor 34.
Is controlled to maintain the heater outlet hot air temperature of the combustion heater 21 within a predetermined range. As a result, by controlling the opening of the temperature control door 20,
It is possible to easily control the blowout temperature blown out from Nos. 6 and 7.

(Control Example 1) An example of the control flow is shown in FIG. First, the signal output from the temperature sensor 43 is input to detect the temperature (step 61), and it is determined whether the temperature detected by the temperature sensor 43 is within a predetermined range (step 6).
2) If it is within the predetermined range, the rotation speed control of the metering pump 38 and the fan 34 is held in the control of that state.
When it is determined that the detected temperature is lower than the predetermined temperature range, the opening of the metering pump 38 is increased to increase the fuel (step 63), and the rotation speed of the fan 34 is increased (step 64). The output of the combustion heater 21 is increased, whereby the heat given from the heat exchange fins 36 to the cold air passing therethrough is increased to raise the temperature of the air. When it is determined that the detected temperature is higher than the predetermined range, the pump opening of the metering pump 38 is reduced,
By reducing the fuel (step 65) and reducing the rotational speed of the fan 34 (step 66), the output of the combustion heater 21 is reduced, and as a result, the heat given from the heat exchange fins 36 to the cold air passing around the heat exchange fins 36 is reduced. Reduce the temperature of the air to lower it.

(Control Example 2) Next, by adjusting the opening of the temperature control door 20, the amount of air introduced to the main duct 15 becomes small, and as a result, the heater outlet temperature of the combustion heater 21 does not fall within a predetermined range, and further the main duct. When the temperature of the hot air flowing through the outlet side of 15 rises abnormally, the combustion heater 21 is forcibly stopped. An example of the control flow at this time is shown in FIG.

First, the temperature from the temperature sensor 43 is detected, and the sensor temperature T1 is set (step 71). This sensor temperature T1 is stored in the memory (step 7).
2). The sensor temperature T1 is read from the memory, and it is judged whether or not the sensor temperature T1 is within the predetermined temperature range (step 73). If it is within the predetermined range, this routine is ended. When it is determined that the sensor temperature T1 is lower than the predetermined temperature range, the metering pump 38
Is increased to increase the fuel (step 74) and the rotational speed of the fan 34 is increased (step 75). If it is determined that the sensor temperature is higher than the specified range,
The opening degree of the metering pump 38 is reduced to reduce the fuel (step 76), the rotation speed of the fan 34 is reduced (step 77), and then the temperature is detected by the temperature sensor 43 (step 78). It is determined whether the temperature is lower than the previous sensor temperature T1 (step 79),
When it is determined that the detected temperature T2 is higher than the previous detected temperature T1, the metering pump 38 is forcibly stopped and the fuel is shut off (step 80). As a result, it is possible to prevent the temperature on the outlet side of the combustion heater 21 from rising excessively.

In the above-mentioned embodiment, a porous type air-fuel mixture was used, but in the present invention, an air mix chamber may be used.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing a warm air heater according to an embodiment of the present invention.

FIG. 2 is a control example 1 of temperature adjustment by the warm air heater of the present invention.
It is a flowchart which shows.

FIG. 3 is a control example 2 of temperature adjustment by the warm air heater of the present invention.
It is a flowchart which shows.

[Explanation of symbols]

 1 duct 2, 3 inlet 5 defrost outlet 6 face outlet 7 foot outlet 11 blower motor 12 fan (blower) 15 main duct 16 bypass duct 17 branch 18 confluence 20 temperature control door 21 Heater (combustion type heater) 22 Mixer 22a Injection hole 30 Intake pipe 31 Fuel supply system 32 Air supply system 33 Fan 34 Motor 36 Heat exchange fin (heat exchanger) 37 Fuel tank 38 Metering pump 39 Exhaust pipe 41 Control device 43 Temperature sensor 46 Exhaust pipe

Claims (3)

[Claims] 1. A heater system having a combustion heater having a heat exchanger and a blower, wherein a blower blower provided at the inlet side of the duct and a main duct and a bypass duct branched from the middle of the duct. A diverging section, a merging section for merging the branched bypass duct outlet side with the main duct outlet side, a combustion heater provided in the main duct and having a heat exchanger, and a main duct and a bypass duct. An air conditioner, comprising: an air volume adjusting unit capable of adjusting an air volume ratio, wherein hot air after passing through the heat exchanger in the main duct and cold air after passing through the bypass duct are mixed. 2. A mixer having a plurality of injection holes is provided in a passage portion where hot air after passing through the heat exchanger and cold air after passing through the bypass duct meet each other. The air conditioner according to claim 1. 3. A temperature sensor provided at the outlet of the heat exchanger, and a control device that receives the output of the temperature sensor and outputs a signal for adjusting the amount of fuel and the amount of air supplied to the combustion heater. The air conditioner according to claim 1, wherein the air conditioner is provided.