JPH075824U - Vehicle air conditioner - Google Patents

Abstract

(57) [Summary] [Purpose] To improve comfort in bilevel mode. [Arrangement] An evaporator 8, a heater core 13 and a blower fan 16 are arranged inside the air conditioning case 1, and a cool air bypass passage 10 communicating with an upper air outlet 28 and a lower air outlet 23 are provided on the downstream side of the evaporator 8. Cold and hot air passage 1
1 and are provided. The inside of the both-side suction type blower fan 16 is partitioned to provide a cool air blower portion 16b and a warm air blower portion 16a,
The suction ports on both sides are separately connected to the cold air bypass passage 10 and the cold / hot air passage 11. Both passages 10 and 11 are divided over the suction port, and the discharge passage of the blower fan 16 is divided corresponding to the cold air blower 16b and the warm air blower 16a. The discharge paths 21 and 22 are connected to the upper and lower outlets 2
Connect to 8 and 23.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an air conditioner for a vehicle that can improve comfort in a bilevel mode.

[0002]

[Prior art]

 Generally, in this type of device, a blower fan, an evaporator, and a heater core are arranged in order from the upstream side of the air conditioning case, as in JP-A-63-17109, for example. The air guides and the air mixing chambers are provided in order to perform good mixing. However, in this case, there is a problem that a large air mixing chamber is required, the heater unit is enlarged, and a large installation space is required for the vehicle.

Recently, it has been required to install a dust collecting filter to realize cleaner air conditioning. In that case, the filter will be installed between the blower fan and the evaporator.However, if this is done, the ventilation path between the blower fan and the evaporator will suddenly widen and the ventilation There is a problem that the resistance increases and the air volume and noise are adversely affected.

Therefore, in order to solve these problems, for example, in Japanese Utility Model Publication No. 52-37400, a blower fan is of a suction type, which is arranged on the downstream side of an evaporator and a heater so that cold air and warm air are discharged. The air is mixed with a blower fan and the air mixing chamber is omitted, and a space for installing a dust collecting filter is secured on the upstream side of the evaporator.

However, in this conventional device, the conditioned air having a uniform temperature state, in which cold air and warm air are mixed, is blown out from the upper and lower air outlets by simply changing the air volume. There is a problem in that air of the same temperature is blown out from the air outlet, and it is not possible to obtain a so-called hot head cold-foot heat type air temperature distribution suitable for the bilevel mode.

[0006]

[Problems to be solved by the device]

 It is an object of the present invention to solve the above problems and provide a vehicle air conditioner capable of improving comfort in the bilevel mode.

[0007]

[Means for Solving the Problems]

 Therefore, the vehicle air conditioner of the present invention has an evaporator, a heater core, and a blower fan inside the air conditioning case, and has a cool air bypass passage communicating with the upper outlet and a lower outlet on the downstream side of the evaporator. In a vehicle air-conditioning system that has a hot / cold air passage communicating with the cooling air duct, the inside of a blower fan with suction on both sides is partitioned to provide a cold air blower part and a hot air blower part. Separately communicating with the air passage, partitioning both of these passages over the suction port, and dividing the discharge passage of the blower fan so as to correspond to the cold air blowing portion and the warm air blowing portion, and discharging each of these. The feature is that the passage is connected to the upper and lower outlets to ensure that a predetermined temperature difference is created in the outlet temperature of the upper and lower outlets, so that comfort in the bilevel mode can be improved. There is.

[0008]

[Action]

 Since a mixing chamber for cold air and hot air is not required, this type of device can be downsized accordingly. The air supply / exhaust passages for the cool air and hot air to the blower fan are completely divided from the air passage on the suction side to the air passage on the discharge side. The temperature difference between the hot air and the hot air is surely formed. When cold air and warm air are mixed and blown out from the upper outlet, by adjusting each air volume, it is possible to adjust the upper outlet temperature over a wide range. The upper and lower outlet temperatures can be changed, allowing variable setting of the bi-level mode. By keeping the upper blowout temperature low and ensuring a large temperature difference from the lower blowoff temperature, a good head cold foot heat type air temperature distribution is obtained in the bilevel mode.

[0009]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. In FIGS. 1 to 4, reference numeral 1 is an air-conditioning case that forms an air passage, and is provided with inside and outside air intakes 2 and 3 on its upstream side. An inside / outside air switching door 4 is rotatably provided in the portion to open / close the inside / outside air intakes 2 and 3. Another internal air intake port 5 is provided in the vicinity of the internal air intake port 2, and an internal air exclusive switching door 6 is rotatably provided at the opening thereof so that the internal air intake port 5 can be opened and closed.

A dust collecting filter 7 is removably attached to the downstream side of the switching doors 4 and 6, and an evaporator 8 is arranged on the downstream side. Behind the evaporator 8, one end of a partition wall 9 is arranged close to the other end, and the other end is extended to the downstream side of the air conditioning case 1, and the wall 9 serves as a cool air passage 10 inside the air conditioning case 1. It is divided into the cold / hot air passage 11.

As shown in the figure, the passage width of the cold air passage 10 is narrower than that of the cold and warm air passage 11, and the cold air bypass door 12 is rotatably provided on the upstream side of the passage 10. The passage 10 can be opened and closed.

A heater core 13 is provided on the upstream side of the hot air passage 11, and a cold / hot air switching door 14 is rotatably provided between the core 13 and the partition wall 9 to connect the passage 11 to the hot air passage 11. It can be opened and closed.

On the downstream side of the air conditioning case 1, a blower 15 of both sides suction type is provided, and its blower fan 16 is arranged on the downstream side of the cold air passage 10 and the cold / hot air passage 11, and the cold / hot air is blown from both sides thereof. It sucks in air and allows it to be blown downstream.

That is, the blower fan 16 is divided into the warm air blower portion 16 a and the cool air blower portion 16 b via the partition plate 17, and their suction ports communicate with the cold air passage 10 and the cold and warm air passage 11 separately. Of these, the blade width of the warm air blowing section 16a is formed wider than that of the cold air blowing section 16b.

Air guides 18 and 19 integrated with the partition wall 9 or the air conditioning case 1 are arranged in the vicinity of the suction inlets of the blowers 16 a and 16 b, and their discharge paths are separated by a partition wall 20. It is divided into a hot air discharge passage 21 and a cold air discharge passage 22.

The warm air discharge passage 21 is provided with a lower outlet 23 for blowing air to the foot side, and at the confluence with the cold air discharge passage 22, air is directed toward a windshield (not shown). Defroster outlets 24 for blowing out are provided, and dampers 25 and 26 are rotatably provided to these so that the outlets 23 and 24 can be opened and closed.

A three-way branch duct 27 is connected to the downstream side of the merging portion of the discharge paths 21 and 22, and a vent outlet that is an upper outlet that blows air toward the duct 27 toward the upper half of the occupant. A plurality of 28 are provided.

FIG. 5 shows another embodiment of the present invention, and the same reference numerals are used for the components corresponding to those of the above-mentioned embodiment. In this embodiment, a communication port 29 that communicates with the cold air passage 10 and the cold / hot air passage 11 is formed in the middle portion of the partition wall 9, and the mouth 29 and the cold air passage 10 are formed at the edge of the communication port 29. A hot air bypass door 30 that can be selectively opened and closed is provided.

The door 30 closes the communication port 29 during cooling, and opens the communication port 29 during heating to bypass a part of the hot air from the cold / hot air passage 11 to the cold air passage 10, and the cold air blower 16b. From the desired outlets 24 and 28 to prevent the situation where the cold air is blown out by the rotation of the cold air blower portion 16b during heating. . In the figure, 31 is a damper provided in the three-way branch duct 27, which allows the passage to the upper outlet 28 to be opened / closed, and makes it possible to select the blowing of cool air from the upper outlet 28 during cooling.

Since the vehicle air conditioner configured as described above does not have an air mixing chamber as in the prior art, it can be downsized by that amount and the installation space for the vehicle can be easily secured. In addition, an installation space for the dust collection filter 7 is secured on the upstream side of the evaporator 8, there is no conventional ventilation fan on the upstream side, and the ventilation path of the air conditioning case 1 has a similar cross-sectional area. Therefore, it maintains a constant ventilation resistance and does not adversely affect the air volume and noise.

Next, in the case of performing the cooling operation of the vehicle air conditioner, for example, the inside / outside air switching door 4 and the inside air exclusive switching door 6 are operated as shown by the solid line in FIG. 1 to close the outside air intake 3. The inside air intake 5 is opened. Further, the cold air bypass door 12 and the cold / hot air switching door 14 are operated as shown by the solid line in FIG. 1 to open the cold air bypass door 12 and open the cold / hot air passage 11 to the cold air side. Further, the dampers 25 and 26 are operated as shown by the solid lines in FIG. 1 to close the lower outlet 23 and the defroster outlet 24 and open the upper outlet 28.

When the blower 15 is driven under such a condition and the cooling operation is started, the vehicle compartment air is sucked into the air conditioning case 1 through the inside air intake ports 2 and 5, and this is passed through the dust collecting filter 7 to generate dust. Are removed and cooled when passing through the evaporator 8, the cold air thereof is guided to the cold / hot air passage 11, and a part thereof is guided to the cold air bypass passage 10.

Of these, the cold air guided to the cold / hot air passage 11 is sucked into the warm air blowing unit 16 a of the fan 16 via the air guides 18 and 19, and is discharged to the warm air discharge passage 21. Further, the cold air guided to the cold air bypass passage 10 is sucked into the cold air blowing portion 16b of the fan 16 from the downstream side thereof via the air guides 18 and 19, and is discharged to the cold air discharge passage 22.

These cold winds merge at the downstream of both discharge passages 21 and 22, and are blown out from each upper outlet 28.

Next, in the heating operation of the vehicle air conditioner, for example, the inside / outside air switching door 4 and the inside air exclusive switching door 6 are operated as shown by the chain line in FIG. 1 to open the outside air intake 3. The inside air intakes 2 and 5 are closed. Further, the cold air bypass door 12 and the cold / hot air switching door 14 are operated as shown by the chain line in FIG. 1 to close the cold air bypass passage 10, and the cold / hot air passage 11 to the warm air side, that is, the heater core 13 side. Open. Further, the dampers 25 and 26 are operated as shown by the chain line in FIG. 1 to open the lower outlet 23 and the defroster outlet 24 and close the upper outlet 28.

When the blower 15 is driven under this condition and the heating operation is started, the outside air is sucked into the air conditioning case 1 through the outside air intake port 3, and this is removed through the dust collecting filter 7 to remove the dust. After passing through the evaporator 8, it is guided to the heater core 13 and heated.

The warm air is sucked into the warm air blowing portion 16 a of the fan 16 via the air guides 18 and 19, and is then discharged to the warm air discharge passage 21, and the lower outlet 23 and the defroster outlet 24. Blown out from.

On the other hand, when the air-conditioning operation is performed in the bi-level mode in the middle of spring and autumn, for example, the inside / outside air switching door 4 and the inside air only switching door 6 are operated as shown by the chain line in FIG. The inside air intakes 2 and 5 are closed while being opened. Further, the cold air bypass door 12 and the cold / hot air switching door 14 are operated to an intermediate position between the solid line and the chain line in FIG. 1 to set the cold air bypass passage 10 and the cold / hot air passage 11 in a substantially half open state.

In this case, when the air-level bi-level mode is set, the opening degree of the cold air bypass door 12 is increased from the half open state, and the opening degree of the cold / hot air switching door 14 is increased from the half open state. In other words, it is positioned on the heater core 13 side. On the contrary, when the bi-level mode of heating is set, the opening degree of the cold air bypass door 12 is reduced from that in the half open state, and the opening degree of the cold / hot air switching door 14 is reduced from that in the half open state, that is, the heater core. Position to the opposite side of 13.

Further, the dampers 25 and 26 are operated to open the lower outlet 23 and the upper outlet 28 and close the defroster outlet 24.

When the blower 15 is driven under such a condition and the bi-level mode operation is started, the outside air is sucked into the air conditioning case 1 from the outside air intake 3, and this is passed through the dust collecting filter 7 to collect dust. It is removed and cooled when passing through the evaporator 8, and the cold air is guided to the cold air bypass passage 10 and the cold / hot air passage 11 according to the opening degree of each door 12, 14.

Of these, the cold air guided to the cold air bypass passage 10 is sucked into the cold air blowing portion 16 b of the fan 16 from the downstream side through the air guides 18 and 19, and is discharged to the cold air discharge passage 22.

On the other hand, the cold air guided to the cold / hot air passage 11 is heated when passing through the heater core 13, and a part of the cold air moves in the cold / hot air passage 11 without being heated. Merge and start mixing in the foreground. The mixed air is guided to the air guides 18 and 19, sucked into the warm air blowing unit 16a of the fan 16 and stirred, adjusted to a uniform temperature state, and discharged to the warm air discharge passage 21, A part of the warm air is blown out from the lower outlet 23 to the foot side.

After that, the warm air merges with the cool air in the cool air discharge passage 22 on the downstream side of the warm air discharge passage 21, is mixed and cooled, and is blown out from the upper outlet 28.

In this case, the temperature of air blown out from the upper air outlet 28 depends on the degree of the above-mentioned temperature drop, and this is achieved by adjusting the opening degrees of the cold air bypass door 12 and the cold / hot air switching door 14 to make the passages 10 and 11 open. It can be variably adjusted by adjusting the volume of cold and warm air.

Moreover, the cold air before merging is discharged from the cold air bypass passage 10 to the cold air discharge passage 22 through the cold air blowing portion 16b, and until it merges with the hot air, the partition walls 9, 20 and the air guides 18, 19 are combined. The contact with the hot air is avoided at all through and the temperature rise is prevented.

On the other hand, the warm air before merging is discharged from the cold / warm air passage 11 to the warm air discharge passage 21 through the warm air blowing unit 16a, and until it merges with the cool air, the partition walls 9 and 20 and the air guide 18 are connected. , 19 to avoid contact with cold air at all and prevent the temperature from decreasing.

Therefore, the relatively high temperature hot air is blown from the lower outlet 23, while the temperature is significantly lowered after joining with the cold air and is blown out from the upper outlet 28. A large temperature difference from the temperature is formed, and a good air temperature distribution of the so-called head-and-foot type is obtained. This situation is as shown in FIG. 3, in which the temperature of the air blown from the upper air outlet 28 can be adjusted in a wide range and the temperature of the hot air can be adjusted appropriately by adjusting the opening degree of the cold / hot air switching door 14, so that the downward air blowing can be performed. The temperature difference from the outlet 23 can be set, and the bilevel mode can be variably set as shown in FIG. 4 to meet various usage environments.

[0039]

[Effect of device]

 As described above, the vehicle air conditioner of the present invention partitions the interior of the blower fan on both sides to provide a cool air blower part and a warm air blower part. The ventilation fan is separately communicated with the passage, and both of these passages are divided over the suction port, and the discharge passage of the blower fan is divided so as to correspond to the cold air blower portion and the warm air blower portion. The cold and hot air passages for the air are completely partitioned from the suction passage to the discharge passage, and their contact is avoided to prevent temperature changes between them. It can be reliably formed, and has the effect of obtaining a good air temperature distribution of the head cold foot heat type in the bilevel mode.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is an explanatory view showing an enlarged main part of a blower fan applied to the present invention.

FIG. 3 is a characteristic diagram showing a situation of a blowout temperature in a vent (upward blowout) mode of the present invention.

FIG. 4 is a characteristic diagram showing the condition of the outlet temperature in the bilevel mode of the present invention.

FIG. 5 is a cross-sectional view showing another embodiment of the present invention.

[Explanation of symbols]

 1 Air Conditioning Case 8 Evaporator 10 Cold Air Bypass Passage 11 Cold / Hot Air Passage 13 Heater Core 16 Blower Fan 16a Hot Air Blower 16b Cold Air Blower 21 Warm Air Discharge Path 22 Cold Air Discharge Path 23 Lower Air Outlet 28 Upper Air Outlet

Claims (1)

[Scope of utility model registration request] 1. An evaporator, a heater core, and a blower fan are arranged inside an air-conditioning case, and a cool air bypass passage communicating with an upper outlet and a cold / hot air passage communicating with a lower outlet are provided on the downstream side of the evaporator. In the provided vehicle air conditioner, the inside of the double-sided suction type fan is partitioned to provide a cool air blower section and a warm air blower section, and the suction openings on both sides are separately connected to the cold air bypass passage and the cold / hot air passage. , These two passages are divided over the suction port, and the discharge passage of the blower fan is divided corresponding to the cold air blower portion and the warm air blower portion, and these discharge passages are connected to the upper and lower outlets. A vehicle air conditioner characterized by the above.