JPH0764182B2 - Automotive air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to an air conditioner for an automobile having improved rising characteristics of heating effect.

[Prior Art] In an automobile air conditioner, it is common to heat the blown air by a heater core that uses engine cooling water as a heat source to heat the interior of the vehicle.

[Problems to be solved by the invention]

By the way, when we surveyed the ride time of automobiles, the percentage of short-time rides is high in Japan, so it often happens that the engine cooling water does not rise sufficiently enough to get off the vehicle. There is a growing need to get up. Further, this problem is particularly serious in a vehicle type in which the engine cooling water temperature as a heat source for heating does not rise so much, such as a vehicle equipped with a diesel engine or a highly efficient gasoline engine.

On the other hand, when the inside of the vehicle is heated in the inside air (air inside the vehicle) introduction mode in order to quickly raise the temperature of the blown air, there is a problem that the window glass of the vehicle becomes cloudy.

Therefore, in view of the above point, the present invention has an object to provide an air conditioner for an automobile capable of realizing early rising of the temperature of blown air while preventing fogging of the window glass.

[Means for solving problems]

In order to achieve the above-mentioned object, the present invention provides: (a) an inside / outside air switching box having an outside air introducing port for introducing outside air and an inside air introducing port for introducing inside air; and (b) provided in the inside / outside air switching box, An inside / outside air switching valve that opens and closes both inlets; and (c) a partition member that separates the outside air flow path from the inside air flow path when a state in which the outside air and the inside air are simultaneously introduced by the inside / outside air switch valve is set, d) an evaporator provided so as to communicate with the outside air passage in a downstream air passage of the inside / outside air switching box; and (e) so as to communicate with the inside air passage at a side of the evaporator. A bypass passage that is provided to allow air to flow by bypassing the evaporator; and (f) a partition member that separates the evaporator-side first passage and the bypass passage-side second passage downstream of the evaporator and the bypass passage. (G) Passes through the first flow path on the evaporator side And a heater core for heating the air that has passed through the second passage on the side of the bypass passage, and (h) an upper outlet provided so as to blow out the air that has passed through the first passage and the heater core on the evaporator side, and A technical means is provided that includes a defroster outlet and (i) a foot outlet provided so as to blow out the air that has passed through the second passage on the bypass passage side and the heater core.

[Action]

According to the above technical means, when the heat mode in which the wind is blown from the foot outlet and the wind is also blown from the defroster outlet, the inside / outside air switching valve is set to a position for introducing the inside air and the outside air at the same time. By the operation, the warm air heated by the dry outside air can be blown to the defroster outlet, and the warm air heated by the warm inside air can be blown to the foot outlet.

〔Example〕

The present invention will be described below with reference to embodiments shown in the drawings. FIG. 1 shows the overall configuration of an automobile air conditioner, which includes a blower unit 10, a cooling unit 40, and a heater unit 50.
It consists of and.

As shown in detail in FIGS. 2 to 4, the blower unit 10 has a scroll-shaped blower housing 11, and the blower outlet 12 of the blower housing 11 has a cooling unit 40.
Is connected to the air intake 41. Reference numeral 13 is an inside / outside air switching box formed in a bottomed cylindrical shape, and is an intake port of the blower housing 11.
Connected to 14. The inside / outside air switching box 13 has an outside air introduction port 15 and an internal introduction port 16 on the outer peripheral surface of the cylinder. Reference numeral 17 denotes a bottomed cylindrical internal / external air switching valve rotatably installed in the switching box 13, which is for selectively opening / closing the external air introducing port 15 or the internal air introducing port 16 and is located at the internal air introducing position 17a. And the outside air introduction position 17b and the inside and outside air simultaneous introduction position 17c. 18 is the valve hole of this valve 17, 19 is the valve hole 18 outside air inflow region 18a
This is a partition plate provided inside the valve 17 for partitioning it into the inside air inflow region 18b. That is, the partition plate 19 rotates when the valve 17 is rotated in such a positional relationship that the valve hole 18 of the inside / outside air switching valve 17 is simultaneously opened to the outside air introduction port 15 and the inside air introduction port 16 (broken lines in FIGS. 1 and 3). The position 17c) divides the inside of the valve 17 into an inside air inflow region 18b and an outside air inflow region 18a. This inside / outside air inflow area 18a,
In order to improve the partition effect of 18b, the rotating position of the partition plate 19 becomes a problem, but according to the experiment of the present inventor, the nose portion 11a of the blower housing 11 and the rotating center of the valve 17 are arranged. When the partition plate 19 is positioned on the connecting line (see FIG. 1, 3
It was confirmed that the above-mentioned partitioning effect was good, as indicated by the broken line position 17c) in the figure. Reference numeral 20 is a rotary shaft of the valve 17, and the partition plate 19 and the valve 17
The three parts (17, 19, 20) rotate together. One end of the rotary shaft 20 is rotatably supported by the partition plate portion 21 of the intake port 14 of the blower housing 11, and the other end is rotatably supported by the inside / outside air switching box 13. The inside / outside air switching box 13 is fixed to the side surface of the blower housing 11 with screws 22. Further, an operating lever 23 is coupled with a nut 24 to the other end of the rotary shaft 20 protruding to the outside of the inside / outside air switching box 13. The operating lever 23 is connected to an electric control actuator (not shown) such as a servo motor.

25 is a blower fan provided in the blower housing 11,
In this example, a sirocco fan is used and is driven by the motor 26. The motor 26 is fixed to the blower housing 11.

Reference numeral 27 denotes a partition plate provided in the blower housing 11, which connects the air flow passage in the blower housing 11 to the outside air passage 28 and the inside air passage 29.
It is a partition. Here, since the blown air in the blower housing 11 is divided into the outside air portion and the inside air portion by the partition plate 19 in the inside / outside air switching valve 33 described above, the partition plate 27 is not always necessary. Reference numeral 30 denotes a damper provided in the blower housing 11 in the vicinity of the air outlet 12 and between a solid line position 30a and a broken line position 30b about a shaft 31 provided as an extension of the partition plate 27 as a rotation center. Rotate with.

The cooling unit 40 includes an evaporator 42 of a refrigeration cycle that operates using an automobile engine as a drive source, and the evaporator 42.
And a partition plate 44 that partitions the flow path on the side of the evaporator 42 and the bypass path 43 from each other. The flow path 45 on the evaporator 42 side is the outside air flow path of the blower unit 10.
The bypass passage 43 is formed so as to communicate with the inside air passage 29 of the blower unit 10.

The heater unit 50 has a first flow passage 51 communicating with the flow passage 45 on the evaporator 42 side, a second flow passage 52 communicating with the bypass passage 43, and the first and second flow passages 51, 52. Partition plate 53
And a heater core provided in the central portion of the heater unit so as to heat the air passing through the first and second flow paths 51, 52.
54, dampers 55, 56, 57, 58, 59, a partition plate 60, a defroster outlet 61, an upper outlet 62 for ventilation / cooling, and a foot outlet 63 for heating are provided.

The heater core 54 heats air by using the cooling water (warm water) of the automobile engine as a heat source, and the partition plate 53 and the damper 57 also serve as the first air passage in the heater core 54.
The channel 51 side and the second channel 52 side are partitioned. The dampers 55, 56 are temperature control air mix dampers that control the temperature of the air blown into the vehicle interior by adjusting the air flow rate ratio between the air passing through the heater core 54 and the air bypassing the heater core 54. The damper 57 controls the outlet side air flow path of the heater core 54. The partition plate 60, in cooperation with the damper 57, partitions the flow path on the downstream side of the heater core 54 into the first flow path 51 side and the second flow path 52 side, and the defroster outlet 61 and the upper side on the first flow path 51 side. The outlet 62 is provided, and the second flow path 52 is provided.
A foot outlet 63 is provided on the side.

In the present embodiment, the dampers 30, 55, 56, 57, 58, 59 are all driven by electrically controlled actuators such as servomotors.

FIG. 5 shows an air-conditioning control panel 70 in this embodiment, which panel 70 is usually mounted on the instrument panel of an automobile. 71 is an upper / lower interlocking temperature control lever for operating the two blown air temperature adjusting air mix dampers 55 and 56 while maintaining a predetermined interlocking relationship, and 72 is a separate upper air mix damper 55 The lever 71 is an upper temperature adjusting lever for mechanically rotating, and operates at the time of setting the bi-level mode as described later. At this time, the lever 71 functions as a lower temperature adjusting lever. Reference numeral 73 denotes a blowout mode switching lever, which is moved along the moving guide groove 73a to sequentially defrost (DE) from left to right.
Four air-conditioning blowout modes can be set: F), vent (VENT), bilevel (B / L), and heat (HEAT).

Reference numeral 74 is a rotation speed switching lever of the blower, which switches the energization circuit of the blower motor 26 to switch the rotation speed of the blower in three stages of low (Lo), middle (Mi) and high (Hi) in this embodiment. Reference numeral 75 denotes an inside / outside air switching lever that controls the inside / outside air switching valve 17 of the inside / outside air switching box 13, and the inside air introduction (REC) and the outside air introduction (F
RE) is selected. Reference numerals 71a, 72a, 74a and 75a denote lever sliding grooves, respectively, and 76 denotes an air conditioner switch for connecting and disconnecting the operation of the compressor in the cooling cycle. As is well known, the electromagnetic clutch for the compressor is energized and disconnected. Each of the levers 71, 72, 73, 75 described above operates an electric switch, a variable resistor or the like to generate an electric signal, and controls the energization of the servo motor via a control circuit based on the electric signal, The positions of the inside / outside air switching valve 17 and the dampers 30, 55, 56, 57, 58, 59 are controlled as shown in Table 1 below.

Next, the operation of this embodiment will be described based on the above configuration. Table 1 described later shows the damper position in each blowing mode, and the operation will be described for each blowing mode with reference to Table 1.

(Defrost blowout mode) After introducing outside air having a humidity lower than that of the cabin air, and if necessary, the evaporator 42 dehumidifies it, and after adjusting the temperature to an appropriate temperature by the heater core 54, direct it from the defrost blowout port 61 to the window glass. This is a mode to prevent fog on the window glass by blowing out warm air by setting the blowout mode switching lever 73 to the DEF position, and the temperature adjustment operation is done by the air mix damper with the up / down interlocking temperature adjustment lever 71. 55 and 56 are operated by interlocking between the maximum heating positions 55a and 56a and the maximum cooling positions 55b and 56b. Inside / outside air switching lever 75 is FR
Set to the E position and set the valve 17 of the inside / outside air switching box 13 to 1 in Fig. 1.
The outside air introduction port 15 is opened by operating to the 7b position to introduce the outside air, but if the vehicle is traveling in a place where the outside air is dirty, the lever 75 is switched to the inside air introduction position REC to introduce the inside air. At the same time, the air conditioner switch 76 is turned on to operate the refrigeration cycle, the dehumidifying function of the evaporator 42 dehumidifies the air, and the low humidity air is blown out from the defroster outlet 61.

[Vent blowing mode]

The air-conditioning mode is suitable for mainly blowing out low-temperature outside air or cold air, the various dampers occupy the rotating positions shown in Table 1, and both air-mix dampers 55, 56 are operated in conjunction with each other. Since 30 is operated to the broken line position 30b, all the blown air flows through the flow path on the evaporator 42 side and does not flow into the bypass 43 side. Therefore, the lower half portion of the lower air mix damper 56 and the heater core 54 does not substantially function. However, since the vent mode is set when the strong heating is not originally required, there is no inconvenience in obtaining the desired blowout temperature. In this mode, the inside air or the outside air can be selectively introduced by operating the inside / outside air switching lever 75.

[Bi-level blowing mode]

By setting the blowout mode switching lever 73 of the air conditioning panel 70 to the position marked B / L, each damper
The rotation position shown in FIG. 2 is occupied and the interlocking relationship between the upper and lower air mix dampers 55 and 56 is released. The temperature of the air blown from the upper outlet 62 is controlled by the upper air mix damper 55 through the operation of the upper temperature adjusting lever 72, and the temperature of the air blown from the foot outlet 63 is controlled by the vertical temperature adjusting lever 71.
Can be freely adjusted independently by the lower air mix damper 56 via the movements of. Therefore, since the temperature distribution in the passenger compartment can be controlled artificially and freely, it is also possible to create a so-called head cold foot heat environment, which is called an ideal air-conditioning condition, in an emphasizing or gentle manner depending on the individual preference. I can do it. In this bi-level mode, the damper 30 is operated to the intermediate rotation position 30a in conjunction with the operation of the blowout mode switching lever 73, the inside / outside air switching valve 17 is operated to the position 17c, and the valve opening 1 is opened.
8 simultaneously opens both the outside air introduction port 15 and the inside air introduction port 16 to introduce the inside air and the outside air at the same time. Then, the inside air and the outside air are separated by the partition plates 19 and 27, and the outside air is separated by the evaporator 42.
Side flow path, while the inside air flows into the bypass path 43 side. As a result, the warm air that has heated the inside air by the heater core 54 blows out from the lower outlet 63 to the occupant's feet in the passenger compartment, so that the temperature of the air blown from the lower outlet 63 can be raised early.

[Heat blowing mode]

In a heating mode in which heated air is blown toward the occupant's feet in the passenger compartment, by operating the blow mode switching lever 73 to the HEAT position of the panel 70, the rotational position of each damper is shown in Table 1. Combining, both air mix dampers 55, 56
Are interlocked. In this heat mode, the damper 30 is linked to the operation of the blowout mode switching lever 73,
In addition to being operated to a, the inside / outside air switching valve 17 is operated to the 17c position, so that the evaporator is the same as in the bilevel mode.
The outside air is introduced into the flow path on the 42 side, and the inside air is introduced into the bypass path 43 side. Defroster outlet 61 in heat mode
And the foot outlet 63 are opened at the same time, and a relatively small amount of warm air is blown to the defroster outlet 61 due to ventilation resistance by a defroster nozzle and a defroster hose not shown. On this occasion,
Since low-humidity dry outside air is heated by the heater core 54 and blown out from the defroster outlet 61, the effect of preventing fogging of the window glass becomes very good.

On the other hand, to the bypass passage 43, which is a passage on the foot outlet 63 side, relatively warm air in the passenger compartment is introduced and heated by the heater core 54 to be warm air. 63
Since the air is blown from the air outlet, the temperature of the air blown from the foot outlet 63 can be raised early and the heating effect in the winter can be enhanced.

The present invention is not limited to the above-described embodiments and can be variously modified, and typical modifications will be listed below.

(1) The inside / outside air switching valve 17 may have a flat plate shape instead of the cylindrical shape. In this case, a partition plate 19 is provided separately from the flat plate inside / outside air switching valve 17 on the air downstream side. Good.

(2) The present invention is also implemented in a heater unit of a type in which the air mix dampers 55 and 56 are eliminated as a temperature adjusting means for blown air and a known hot water flow rate adjusting valve for adjusting the hot water flow rate to the heater core is used instead. it can.

(3) In the air-conditioning panel 70 shown in FIG. 5, the case where there are four blowout modes has been described. However, a heater / differential mode for setting the air flow rate to the defroster outlet 61 and the foot outlet 63 at the same level is further added. Good.

(4) The present invention can be implemented not only in the type in which the blower (25, 26) is installed immediately after the inside / outside air switching box 17 but also in the type in which the blower (25, 26) is installed in the heater unit 50. .

(5) The damper 30 can be provided not at the inside of the blower housing 11 but at the air inlet of the cooling unit 40.

〔The invention's effect〕

As described above, according to the present invention, in the heat mode, the defroster air outlet blows out hot air heated by the dry outside air to enhance the anti-fog effect of the window glass, and at the same time the foot air outlet relatively warm inside air. It is possible to expedite the rising of the heating effect by blowing hot hot air that has heated the.

Further, by providing a bypass passage for the flow passage on the evaporator side, there is an advantage that the ventilation resistance on the foot outlet side can be reduced.

[Brief description of drawings]

The drawings show one embodiment of the device of the present invention. FIG. 1 is a sectional view showing the outline of the overall configuration, FIG. 2 is an exploded perspective view of a blower unit portion, and FIG. 3 is a sectional view of the blower unit portion. ,
FIG. 4 shows a cross section taken along the arrow direction of FIG. FIG. 4 shows the line in FIG.
(B) A sectional view taken along the arrow and FIG. 5 is a front view of the air conditioning control panel. 10 …… Blower unit, 13 …… Inside / Outside air switching box, 15 …… Outside air inlet, 16 …… Inside air inlet, 17 …… Inside / Outside air switching valve, 19,27…
… Partition plate, 28 …… Outside air flow path in heat, bi-level mode, 29 …… Inside air flow path in heat, bi-level mode, 30…
… Damper, 40 …… Cooling unit, 42 …… Evaporator, 43
...... Bypass, 44 ...... Partition plate, 50 …… Heater unit, 5
1 ... 1st flow path, 52 ... 2nd flow path, 53, 60 ... Partition plate, 54 ...
… Heater core, 61 …… Defroster outlet, 62 …… Upper outlet, 63 …… Foot outlet.

Claims (1)

[Claims] 1. An inside / outside air switching box having (a) an outside air introducing port for introducing outside air and an inside air introducing port for introducing inside air; and (b) an inside / outside air switching box provided in the inside / outside air switching box for opening / closing both of the introducing ports. An inside / outside air switching valve, and (c) a partition member for partitioning the outside air flow path from the inside air flow path when a state in which the outside air and the inside air are introduced at the same time by the inside / outside air switch valve; An evaporator provided so as to communicate with the outside air passage in a downstream air passage of the switching box; and (e) an evaporator provided so as to communicate with the inside air passage at a side of the evaporator. (F) a partition member for partitioning the first flow path on the evaporator side and the second flow path on the bypass path downstream of the evaporator and the bypass path, and (g) The air passing through the first flow path on the evaporator side and the bypass A heater core that heats the air that has passed through the second passage on the side of the air passage; and (h) an upper outlet and a defroster outlet that are provided to blow out the air that has passed through the first passage on the evaporator side and the heater core. (I) An air conditioner for an automobile, comprising: a second flow path on the side of the bypass and a foot outlet provided so as to blow out the air that has passed through the heater core.