JPS63112209A - Air conditioning device for automobile - Google Patents

Abstract

PURPOSE:To improve air mixing characteristics through simple constitution, by providing cold and hot air dampers, the air holes of the one of which are closed with the surface, having no air hole, of the other in a state to be superposed with each other, and a mechanism, selectively interlocking each damper with various states. CONSTITUTION:An air mixing mechanism comprises cold and hot air dampers 6 and 7, respectively, the air holes of the one of which are closed with the surface, having no air hole, of the other in a state to be superposed with each other, a rotary shaft 8, on which the dampers 6 and 7 are commonly mounted, and an interlocking mechanism, where by means of the reaction force of a spring 9, through the force of which the dampers 6 and7 are separated from each other, a projected part 8a formed on a rotary shaft 8 is adhered to either claw parts 6c or 7c formed to the rear ends of the dampers 6 and 7 for rotation of the damper. Since, with the rotary shaft 8 rotated in, for example, a counterclockwise direction, a force F1 is exerted on the projected part 8a, the projected part 8a presses the one claw part 6c, the rotary shaft 8 and the cold air damper 6 are rotated in the same direction, meanwhile, the hot air damper 7 is prevented from rotation.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a heater unit of an air conditioner for an automobile.
In particular, the present invention relates to an air conditioner for an automobile having an air mix mechanism suitable for improving air mix characteristics and mixing properties.

[Conventional technology]

A typical heater unit for an automobile air conditioner has a structure shown in FIG. In other words, a heater core 1 is provided on the air intake side within the case of the heater unit, and hot air H generated by passing through the heater core 1, which is a heat exchanger,
The air volume of the cold air C that bypasses the heater core 1 is controlled by the rotation of the air mix damper 2, and the hot air H and the cold air C are controlled by rotating the air mix damper 2.
This structure controls the temperature of the temperature-controlled air N generated by air mixing. What are the problems with this common heater unit?

The issue is whether the air mix characteristics and mixing properties are appropriate.

The air mix characteristic is a temperature change characteristic of the temperature-controlled air N with respect to the rotational position angle θ of the air mix damper 2 shown in FIG. FIG. 7 shows air mix characteristics for the general heater unit 1 shown in FIG. 6.

Its characteristic curve is 1/2 from the full cool angle of θ=0°
Temperature-controlled air temperature 1゛ changes from 5℃ to 10℃ between angles of θmax
℃, but the controlled air temperature T is 10% between the angle of just over 1/2 θwax and the full hot angle θmax.
The temperature suddenly changes from ℃ to 80℃. The reason for this characteristic is that the heater core 1 has a large air resistance, and the air resistance of the bypass path of the cold air C squeezed by the air mix damper 2 is the same as the air resistance of the heater core 1. In other words, the air volume of cold air C and warm air H will be the same, and the controlled air temperature T will be the same as that of cold air C.
The angle θ at which the intermediate temperature of and warm air I (approximately 35 degrees Celsius) is θma,
This is because it is located close to x. On the other hand, the air blows out during heating.
The range of the controlled air temperature T often used in the FLOOR mode is 50-30°C, and the range of the controlled air temperature T often used in the B/L mode, which is the intermediate blowout mode, is 30°C. ~20°C, and the range of the controlled air temperature T, which is often used in the TJPPER mode, which is the blowing mode used during cooling, is from 20°C to 10°C. From the air mix characteristics in Figure 7, FLOOR, B/L, UPPER (
71 Control range ΔθF of rotational position angle θ corresponding to each blowout mode.

When determining ΔθB and Δθυ, these ΔθF, ΔθB, and ΔθU are approximately 10% to 2 of the angle θ between 0° and θmax.
This results in a narrow control angle range of 0%. In other words, the problem with the air mix characteristics is that within the movable angle range of the air mix damper 2, the angle range that is often used for vehicle temperature control is narrow;
The problem with manual air conditioning is that it is difficult for the occupant to operate the temperature lever that moves the air mix damper 2 to adjust the temperature of the air according to his or her preference. In addition, automatic air conditioning requires high accuracy in controlling the angle position of the actuator that drives the air mix damper 2; if this accuracy is insufficient, there is a problem that hunting in the angle control, that is, hunting in the temperature of the heated air, occurs. .

Mixability refers to how much the cold air C and warm air H shown in FIG. The question is whether it will be. If this mixing property is poor, the air outlet 10
Since the ducts 20 connected to the ducts 20 branch into 2 to 4 branches, the temperature of the temperature-controlled air distributed to each branched duct 20 is different, resulting in a difference in the outlet temperature between each outlet grille, which may cause discomfort to one passenger. I feel it.

That is, the heater unit having the structure shown in FIG. 6 does not provide good mixing properties, and there is a problem that there is a difference in outlet temperature between the left and right outlet grilles. The reason for this is that both the bypassed cold air C and the warm air H that passed through the heater core 1 are one unified wind flow, and these two winds flow in the same direction and do not mix, resulting in a two-layer wind flow. This is because the two-layered flow forms and reaches the outlet 10 as it is.

Conventional techniques for solving the problems of general heater units described above include Utility Model No. 1540087 and Utility Model No. 1566044, and their basic structures are shown in FIG. Its structure is that a sub air mix damper 4 is provided in the bypass path of the flowing cold air C by bypassing a general heater unit.By interlocking this sub air mix damper 4 with the main air mix damper 3, the air mix Improved characteristics. Figure 9 shows the interlocking line of the rotational position angle θ' of the sub air mix damper 4 with respect to the rotational position angle O of the main air mix damper 3, and the air mix characteristics improved by this interlocking. Compared to the general air mix characteristics, the air mix characteristics shown in Figure 9 are improved by ΔθF, 80B snake Δθ
The control angle range of υ is wider. This means that when the main air mix damper 3 is at an angle close to θWaX, the sub air mix damper 4 is at an angle close to θ'wax.
This effect is due to the fact that the bypass path for the cold air C is narrowed down by the sub air mix damper 4, so that the scenery of the cold air C becomes smaller.

Furthermore, there is a structure shown in FIG. 10 as a conventional technique for improving mixability. Its structure is such that a wind direction plate 5 is provided in a bypass path through which cold air C flows, and the wind direction plate 5 changes the direction of cold air C so that hot air H and cold air C collide with each other to improve mixing properties. .

[Problem that the invention seeks to solve]

Among the conventional techniques, the technique shown in FIG. 8 for improving air mix characteristics requires communication between two dampers having different rotation axes, the main air mix damper 3 and the sub air mix damper 4. There is a problem in that it is necessary to provide an interlocking link mechanism between the two rotating shafts or to provide an actuator for each rotating shaft, resulting in increased costs.

Furthermore, there is a problem in that a space is required to provide the sub air mix damper 4, which increases the size of the heater unit.

Further, the technique shown in FIG. 10 for improving the mixing property has the problem that the wind direction plate 5 becomes an extra air resistance body during full cooling, and the maximum cooling performance deteriorates depending on the air volume range.

Furthermore, there is a problem in that a space is required to provide the wind direction plate 5, which increases the size of the heater unit.

The present invention solves the above-mentioned problems of the prior art, and has the same size as a general heater unit, does not require a new interlocking linkage mechanism or actuator, and does not reduce the air volume during maximum cooling. An object of the present invention is to provide an air conditioner for an automobile having an air mox mechanism with excellent air mix characteristics and mixing properties.

[Means for solving problems]

The present invention provides a cold-air damper and a hot-air damper in which two dampers are overlapped so that one air hole is blocked by the other air hole-free surface, and a rotating shaft to which the two cold-air and hot-air dampers are rotatably mounted in common. The claw-shaped protrusion provided on the rotating shaft is activated by the reaction force of the spring that is inserted into the rotating shaft and acts to separate the cold air and hot air damper. The air mixer end includes an interlocking mechanism that rotates in close contact with one of the protrusions.

[Effect]

According to the present invention, the air holes of the two cold air and hot air dampers have arbitrary shapes and areas, and are located at positions that do not coincide with each other, so that at each rotating position, the change in the wind direction of the cold air and hot air becomes gradual, and the air The mix characteristics are improved, and the air holes disperse the cold and hot air flow, resulting in good mixing properties, and there is no increase in air resistance on the bypass side of the heater core, so the maximum cooling performance is also good.On the other hand, the damper rotates with an interlocking mechanism. Therefore, the size of the heater unit does not change.

〔Example〕

A first embodiment of the present invention will be described with reference to FIG. 1st
The figure is a partial cross-sectional perspective view of a heater unit for an automobile air conditioner according to the present invention, showing a heater core 1, an upper air outlet 11. FL○OR outlet 12 and DEF outlet 13,
A general heater unit having an UPPER/DEF switching damper 21 and a FLOOR opening/closing damper 22 includes a cold air damper 6 and a hot air damper 7 according to the present invention, a rotating shaft,
This structure incorporates an air mix mechanism configured with an actuator 30.

The Air Motx mechanism consists of a cold air damper 6 and a warm air damper 7 in which two sheets are overlapped and one air hole is blocked by the other surface without air holes, and the two cold air dampers 6 and hot air damper 7 are common to each other. The claw-shaped protrusion 8a provided on the rotating shaft 8 is activated by the reaction force of the rotating shaft 8 which is rotatably attached and the spring 9 which is inserted into the rotating shaft 8 and acts to separate the cold air damper 6 and the warm air damper 7. Cold air damper 6 and warm air damper 7
It is an air mix mechanism consisting of an interlocking mechanism that closely rotates either one of the claw-shaped protrusions 6c provided at the rear end, and the air mix mechanism is configured to mix warm air passing through the heater core side and cold air bypassing the heater core. You can change the air volume ratio.

FIG. 13 to FIG. 19 show the air mix situation, that is, air mix characteristics and mixing properties, for the respective rotational position angles θ and θ2 of the cold air damper 6 and hot air damper 7 that are linked to the rotation angle α of the rotating shaft. explain.

13 and 14 show the relationship between the rotation angle α of the rotating shaft 8 and the rotation position angles θ and θ2 of the cold air damper 6 and the hot air damper 7.

In Figure 15, the balloon mode for a=2amax is FLOQR.
mode, and el and Oz at this time are equal to θwax at the maximum rotational position angle. The cold air and hot air dampers 6 and 7 overlap each other, the air holes 6a and 7a are blocked, and the bypass path is fully opened, creating a fully hot state in which warm air passes only through the heater core 1.

Figure 16 shows that the blowout mode for α=2αn+ax is FL○O.
In the R mode, θ1 remains θmax, but θ2 becomes weaker than θwax, and a gap is created between the cold air damper 6 and the hot air damper 7, and between the tip of the hot air damper 7 and the inner surface of the heater unit, and the air hole 7a. Cold air C flows into the gap, and this cold air C passes through the air hole 6a and reaches the FLOOR outlet 12.
flowing to. On the other hand, the hot air H also flows to the FLOOR outlet 12. At this time, since there is air resistance due to the air hole 6 in the bypass of the cold air C, the change in the air volume of the cold air C in response to a change in O, that is, a change in θ2 is generally It is more gentle than other heater units. In other words, the temperature change of the temperature-controlled air N with respect to the change in θ becomes gradual. Furthermore, since the cold air C flows in a dispersed manner through several air holes 6a, the mixing performance is improved compared to a general heater unit in which the cold air C flows in through a single inlet hole formed between the tip of the air mix damper and the inner surface of the heater unit.

In Figure 17, the blowout mode for α=α+max is B/L.
The mode mOl is θll1ax and θ2 is 0'.

The cold air C flows through the air hole 6a, and the warm air H flows through the air hole 7a and the heater core 1. One step before this state, that is, as α increases from αwax strength to αmax, the hot air damper 7 approaches the heater core 1, so the air volume of the hot air H decreases and the temperature of the temperature-controlled air N decreases, but there is an air hole 7a. Therefore, the temperature change becomes gradual. In addition, there are several air holes 6 for cold air C.
Since it flows in a dispersed manner from a, the mixing properties are better than in a general heater unit.

In FIG. 18, the blowing mode is the B/L mode in a state where α=α1IIax. At this time, θ2 remains 0'' and is 01
is a little less than 0181, and the bypass path for the cold air C becomes the gap between the air hole 6a and the tip of the cold air damper 6 and the inner surface of the heater unit. As α becomes smaller, 01 becomes smaller, the gap becomes larger, the air volume of the cold air C increases, and the temperature of the temperature-controlled air N decreases, but because of the air hole 6a, the rate of change in the air volume of the cold air C is small, and α The temperature change of the temperature-controlled air N becomes gradual. Furthermore, since the cold air C flows in a dispersed manner through the several air holes 6a and their gaps, mixing properties are improved.

In FIG. 19, the blowing mode when α=O# is the tlPPER mode. At this time, θ engineering and θ2 become Oo.

The air holes 6a and 7a are blocked so that no air flows into the heater core 1, and only the cold air C flows through the bypass path, resulting in a fully cooled state. At this time, the bypass path air resistance of the cold air C is the same as that of a general heater unit.

Before reaching this state, that is, as α goes from a little over 0' to 0'', θ1 also goes from a little over 06 to 0'', the air volume of the warm air H changes, and the temperature of the temperature-controlled air N also changes with respect to θ. At α=0″, the lowest temperature is about 5°C.

1 Next, the structure and operation for interlocking the cold air damper 6 and the hot air damper 7 will be explained.

FIG. 2 is a perspective view of the air mix mechanism (air holes 6a and 7a are omitted), in which a cold air damper 6 and a warm air damper 7 are commonly rotatably attached to one rotating shaft 8, and and claw-like projections (hereinafter referred to as claws) 6G and 7C at the rear end of the hot air damper, and a claw 8 provided on the rotating shaft 8.
a, and a spring 9 that acts to open the cold air and hot air dampers 6 and 7. The interlocking operation of this structure will be explained with reference to FIGS. 3 to 5. Figures 3 to 5 are 2
It is a cross-sectional view of the figure LL' cross section seen from the arrow M direction. FIG. 3 shows a state in which a counterclockwise force is applied to the rotating shaft 8. This force applies a force F1 to the claw portion 8a, and this force causes the claw portion 8a to push the claw portion 6c, resulting in the state shown in the figure. become. When the claw portion 8a rotates clockwise from this state, the claw portion 60 rotates in close contact with the claw portion 8a due to the reaction force of the spring 9 shown in FIG. That is, the rotating shaft 8 and the cold air damper 6 rotate in the same direction, but the hot air damper 7 does not rotate.

FIG. 4 shows a state when no rotational force is applied to the rotating shaft 8, and the cold air damper 6 and the hot air damper 7 move away from each other due to the reaction force of the spring 9 shown in FIG. One end of the airflow inlet side is in contact with the heater core side, and the other end is in contact with the inner wall of the heater unit. At this time, the three claws 6c, 7c, and 8a provided at the rear end of the cold air damper 6, the hot air damper 7, and the rotating shaft 8 overlap.

The cold air damper 6 forms an angle with the claw portion 6c, and the hot air damper 7 forms an angle with the claw portion 7c.

FIG. 5 shows a state in which a clockwise force is applied to the rotation @8, and the force causes the claw portion 8a to push the claw portion 7C, resulting in the state shown in the figure. When the claw portion 8a rotates counterclockwise from this state, the claw portion 7c rotates in a state in which the claw portion 8a is in close contact with the claw portion 7c due to the reaction force of the spring 9 shown in FIG. In other words, although the rotating shaft 8 and the hot air damper 7 rotate in the same direction,
The cold air damper 6 does not rotate.

A second embodiment of the present invention will be described with reference to FIG. 20. FIG. 20 shows experimental results for confirming the effect of the present invention.

In the experiment, the air mix damper of a general heater unit was modified to the air mix mechanism of the present invention, and the air mix characteristics before and after the modification were compared.

Dotted line A in Figure 20 shows the air mix characteristics before modification.

The solid line shows the air mix characteristics after modification. Before modification of the heater unit used in the experiment, the rotation angle range of the air mix damper, that is, the rotation axis movable angle, was 40 degrees.
In the modified air mix mechanism, the movable angle of the rotating shaft is 80', which is double the angle before modification.

Therefore, the characteristic shown by dotted line B is obtained by pushing the horizontal axis of the characteristic shown by dotted line A twice. Point 1iAB, which is a characteristic of the conventional one
Comparing the characteristic of the present invention with the solid line, the control angle range for the temperature control range of each blowing mode is Δθυ′, Δ
Δθυ from θB' and ΔθF'.

ΔOB and ΔθF have been improved. That is, it has been found that the present invention can improve the control angle range by approximately 1.5 to 3 times as much as the conventional technology. It was also found that the mixing property was improved to about 10°C by the present invention, whereas in the prior art, the maximum temperature change at the outlet was about 20°C.

According to this embodiment, by replacing only the air mix damper section of the conventional heater unit with the air mix mechanism according to the present invention, the air mix characteristics and mixing properties can be improved, and the cost increase of the air mix mechanism is small. Yes, it is possible to realize a heater unit with high cost performance.

A third embodiment of the present invention will be described with reference to FIGS. 21 and 22. In FIG. 21, a protrusion 7b is provided in the air hole 7a of the hot air damper 7 as a method for further increasing the effect of improving the air mixing property of the air mixing mechanism according to the present invention.

The degree of increase in the amount of cold air with respect to the rotation angle of the rotating shaft becomes more gradual near full hot as shown in FIG.

A fourth embodiment of the present invention will be described with reference to FIGS. 23 and 24. In FIG. 23, a wind direction nozzle 6b is provided on the outlet side of the air hole 6a of the cold air damper 6 as a method for further increasing the effect of improving the mixing property of the air mix mechanism according to the present invention. With this wind direction nozzle 6b, the cold wind C that has passed through the wind hole 6a at the position of the cold wind damper 6 in FIG. 24 becomes a fast stream and flows downward, so that turbulence is more likely to occur, and the mixing property is further improved. In the full cool state, the wind direction nozzle 6b is located at the position indicated by the dotted line in FIG. 24, and at this time, the wind direction nozzle 6b does not act as an air resistance element in the bypass path through which the cold air C flows.

〔Effect of the invention〕

According to the present invention, the airflow in each airflow mode is achieved with a very simple structure, without changing the structure and size of the general heater unit of the prior art, and without sacrificing the air volume during maximum cooling. The angle range of the rotation axis of the air mix mechanism that can be used during wind temperature control can be expanded by 1.5 to 3 times, and in manual air conditioning, it is easier to operate the template lever according to the passenger's preference. In automatic air conditioning, control is stable and the hunting problem of outlet temperature can be solved.

In addition, the air temperature change at the heater unit outlet can be reduced to less than half that of conventional technology, reducing the temperature difference between the left and right outlet grills, reducing the discomfort of the occupants due to the temperature difference, and controlling the temperature between the left and right occupants. The difference in feeling can be resolved.

[Brief explanation of the drawing]

Fig. 1 is a partial cross-sectional perspective view of a heater unit showing a first embodiment of the present invention, Fig. 2 is a perspective view of an air mix mechanism, and Figs. 3 to 5 are LL' cross sections of Fig. 2. 6, 8 and 10 are longitudinal sectional views of conventional heater units, and FIGS. 7 and 9 are air mix characteristics of conventional heater units. 11 is a perspective view of an air mix damper showing a first embodiment of the present invention,
FIG. 12 is a front view of an air mix damper showing the first embodiment of the present invention, and FIGS. 13, 15, 16, 17, 18, and 19 are views of the first embodiment of the present invention. FIG. 14 is a longitudinal sectional view of a heater unit showing an example, FIG. 14 is an angular relationship diagram of two dampers showing a first embodiment of the present invention, and FIG. Mix characteristic diagrams, FIGS. 21 and 22 are longitudinal cross-sectional views of a heater unit and a warm air damper showing a third embodiment of the present invention, and FIGS. 23 and 24 are a fourth embodiment of the present invention. FIG. 2 is a vertical cross-sectional view of a heater unit and a cold-air damper, each showing an example. 1...Heater core, 6...Cold air damper (air mix damper) 6a...Air hole, 6b...Protrusion, 6c...
...Claw-shaped protrusion, 7...Hot air damper (air mix damper), 7a...Air hole, 7b...Protrusion, 7c...
... Claw-shaped protrusion, 8... Rotating shaft, 8a... Claw-shaped protrusion, 9... Spring.

Claims (4)

[Claims] 1. an air mix damper that distributes air drawn into the case and changes the air volume ratio between warm air passing through the heater core side and cold air bypassing the heater core; and a rotating shaft to which the air mix damper is rotatably attached. In an automobile air conditioner having an air mix mechanism consisting of
A cold-air damper and a hot-air damper in which the air holes on one side are blocked by a surface without air holes in the other when the two pieces are overlapped, a rotating shaft to which the cold-air damper and the hot-air damper are rotatably attached in common to the rotating shaft, and A claw-like protrusion provided on the rotating shaft is caused by a reaction force of a spring that acts to separate the cold-air damper and the hot-air damper when they are inserted into each other. An air conditioning system for an automobile, characterized in that the air mix mechanism includes an interlocking mechanism that rotates one of the parts in close contact with the other. 2. The cold air damper and warm air damper have an angle with their respective claw-shaped protrusions, and the claw-shaped protrusions provided on the rotating shaft sandwiched between the cold air damper and the hot air damper control the movable angular range of the cold air damper and the hot air damper. The air conditioner for an automobile according to claim 1, characterized in that the air mix mechanism includes an interlocking mechanism that rotates at a rotational axis movable angle that is doubled. 3. The air conditioner for an automobile according to claim 1 or 2, characterized in that a protrusion is provided in the air hole of one of the two warm air dampers. 4. An air conditioner for an automobile according to any one of the preceding claims, characterized in that a wind direction nozzle is provided on the outlet side of the air hole of one of the two cold air dampers.