JPH0440968Y2 - - Google Patents

Description

[Detailed explanation of the idea]

Industrial Application Field This invention relates to a vehicle air conditioner that further improves cooling performance when the air mix door is in vent mode with the heater core fully closed (maximum cooling state). Conventional technology As a conventional vehicle air conditioner, for example,
The one shown in Publication No. -48516 is known. To explain this with reference to FIG. 4, a heater core 33 that heats the air cooled by the evaporator 32 is provided upstream in the heater unit 31 of the vehicle air conditioner 30. Air mix door 3 that controls heating air volume
4 is rotatably provided. Further, an air mix chamber 3 is provided downstream of the heater unit 31.
The air outlet 36 is provided with an air outlet 36 that is connected to the air outlet 5, and an air mix plate 37 that fully opens the air outlet 36 when the air mix door 34 is in a state where the heater core 33 is fully closed.
is pivotably supported. When you want to maximize the cooling performance of the vehicle air conditioner 30, use manual operation or automatic control to fully open the air outlet 36 in vent mode, fully close the heater core 33 with the air mix door 34, and use the blower fan 38 to maximize the air volume. The air conditioner was set to maximum cooling (full cool). However, in this vehicle air conditioner 30, since the heater core 33 in the heater unit 31 is located upstream of the air outlet 36 that blows out cold air, the temperature control mechanism of the heater core 33, air mix chamber 35, etc. becomes ventilation resistance of cold air, and it is difficult to increase the amount of air passing through the air outlet 36 even if the air outlet 36 is fully opened, and the cooling performance at maximum cooling when the heater core 33 is fully closed by the air mix door 34 in vent mode is It was inferior. In order to solve the above problems, for example,
A vehicle air conditioner disclosed in Japanese Patent No. 61-53208 is known. To explain this with reference to FIG.
A cold air bypass duct 45 is formed which faces the third side and has a cold air intake port 44 open. A cold air outlet end 46 of the cold air bypass duct 45 is opened to a vent duct 48 that communicates with a vent outlet 47, and the opening portion 49 is provided with an opening for selectively opening and closing the cold air bypass duct 45 and the vent duct 48. One damper 50 is provided. When the air mix door 51 is in a state where the heater core 42 is fully closed (maximum cooling state) in the vent mode of the vehicle air conditioner 40, a part of the air (cold air) cooled by the evaporator 52 passes through the cold air bypass duct 45. Tsute vent duct 48
The remaining cold air is supplied into the vehicle interior from the vent outlet 47 at the center of the vent duct 48, and the remaining cold air is supplied into the vehicle interior from the vent outlets 54, 54 on both sides of the vent duct 48 through the air mix chamber 53. Problems to be Solved by the Invention However, in the vehicle air conditioner 40, in the vent mode at maximum cooling (full cool), the vent outlet 47 is connected not only to the cold air bypass duct 45 but also from the air mixture chamber 53 side. Vent duct 48
Cold air is sent to the vent outlet 54 only from the air mixture chamber 53, and no cold air is sent from the cold air bypass duct 45.
The air distribution to the vent outlets 47 and 54 at the center and both sides of the vent duct 48 was unbalanced, and the amount of air blown from the vent outlets 47 and 54 was not uniform. In addition, in general, heating performance does not increase beyond a certain level even if the air volume is increased by a blower fan during maximum heating (full hot), but cooling performance tends to improve by increasing the air volume during maximum cooling (full cool). Therefore, when the maximum cooling (Full Cool) is reached, the maximum heating (Full Hot) is reached.
The rotation of the blower fan was increased to increase the air volume. For this reason, the air mix chamber 53
The cold air passing through the side is subject to relatively large ventilation resistance due to the temperature control mechanism being in the way, reducing the amount of air passing through it and easily generating loud noise. Therefore, this idea was developed to dramatically lower the ventilation resistance of cold air, reduce noise, increase the amount of passing air, and equalize the amount of air blown from each vent outlet when in vent mode with the heater core fully closed using the air mix door. The present invention provides a vehicle air conditioner that can perform the following functions. Means for Solving the Problem A heater core that heats the cooled air, an amount of air guided to the heater core, and the heater core are installed downstream of a cooling unit equipped with an evaporator that cools the inside and outside air taken in by a blower fan. A heater unit is connected to an air mix door that controls the amount of air that bypasses the heater core, and an air mix chamber where the air heated by the heater core and the air that has bypassed the heater core are combined, and a defroster blower is connected to the air mix chamber. For vehicles in which an outlet and a vent communication port are opened, a defroster door capable of opening and closing a defroster outlet and a vent door capable of opening and closing the vent communication port are provided, and the vent communication port and the vent outlet are connected by a vent duct. In the air conditioner, the vent duct is provided along the side wall of the heater unit, and a bypass communication port that opens to the vent duct is directly formed in the side wall upstream of the heater core of the heater unit. The opening is provided with a bypass door that can be opened and closed in a direction that follows the flow of the wind, and the air introduced to the heater core is blocked, the vent communication port is opened, and the amount of air taken in by the blower fan is reduced. At the maximum time, the air mix door, the vent door, and the bypass door connected to the blower fan open. Function When the air mix door fully closes the heater core in the vent mode for maximum cooling, the cold air cooled by the evaporator is supplied directly to the vent duct from the bypass communication port on the upstream side by the heater core of the heater unit that is opened by the bypass door. Air is evenly blown out from the vent outlet. Embodiments Hereinafter, embodiments of this invention will be described in detail with reference to the drawings. In FIG. 1, reference numeral 1 indicates a vehicle air conditioner. This vehicle air conditioner 1 includes a blower unit 2, a cooling unit 3, a heater unit 4,
It is constructed by connecting vent ducts 5. The blower unit 2 is rotatably supported by an outside air inlet 6, an inside air inlet 7, and an inside/outside air switching door 8 for opening and closing both the inlets 6, 7, and a blower fan 9 is disposed inside the blower unit 2. There is. An evaporator 10 is provided within the cooling unit 3 for cooling the inside and outside air sent from the blower unit 2. As shown in FIGS. 1 and 2, inside the heater unit 4, a heater core 11 is disposed on an inclined surface of one side wall 4a, and an air mix door 12 for controlling the amount of air passing through the heater core 11 is provided in front of the heater core 11. It is rotatably supported. A bypass communication port 13 that opens into the vent duct 5 is formed in the other side wall 4b of the heater unit 4 on the upstream side of the heater core 11. This bypass communication port 13 is connected horizontally (to the upper wall 4 c of the heater unit 4 A bypass door 15 is provided which opens parallel to the vehicle. This bypass door 15 cooperates with the air mix door 12 to control the actuator when the air mix door 12 is in the vent mode (the air mix door 12 closes the heater core 11) and the amount of air sucked by the blower fan 9 is at its maximum. It is connected to the air mix door 12, the blower fan 9, and a vent door 21, which will be described later, so as to be opened by driving. As shown in FIG. 3, a baffle plate part 15 is provided on the outside of the upper part of the bypass door 15 to improve the left and right air distribution balance to the vent duct 5.
A may be formed by bending. Further, the downstream side of the heater core 11 of the heater unit 4 is an air mixture chamber 16, and the upper wall 4c, side wall 4b, and bottom wall 4d of the surrounding wall are provided with an air mixture chamber 16 for blowing air toward the front window glass (not shown). Defroster outlet 1 for
7. Vent duct 5 for blowing air towards the passengers
A vent communication port 18 that opens to the passenger's feet and a foot air outlet 19 that blows air toward the passenger's feet are provided. A defroster door 20, a vent door 21, and a hood door 22 are provided at the defroster outlet 17, the vent communication port 18, and the foot outlet 19, respectively, so as to be able to open and close freely. The defroster door 20 is closed in the vent mode and bilevel mode. Incidentally, reference numeral 23 is an air mix plate provided upstream of the air mix chamber 16. The vent duct 5 is formed in a long length along the other side wall 4b of the heater unit 4, and has a total of four grid-shaped vent outlets 2 on both sides and in the center.
4 is formed. The table below shows each mode and the open/closed status of each door. In the table, the "○" mark indicates the open state of each door, and the "x" mark indicates the closed state of each door. In addition, the code "A" in the table for vent mode and bi-level mode
indicates when the amount of air taken in by the blower fan 9 is maximum (Max), and symbol "B" indicates when the amount of air is standard (Normal). In the vent mode, air is blown out from the vent outlet 24, and during cooling, the air mix door 12 fully closes the heater core 11, and the blower fan 9
The vent door 21 and the bypass door 15 are designed to open when the amount of air sucked in by the air conditioner is at its maximum (maximum cooling state). In addition, the air mix door 12 is connected to the heater core 11.
Even in the bi-level mode in which the air outlet is half-opened, as in the vent mode, when the amount of air taken in by the blower fan 9 is at its maximum, the vent door 21 and the bypass door 15 open, and cool air is blown out from the vent outlet 24. , the foot door 22 opens and hot air is blown out from the foot air outlet 19 to the passenger's feet. Note that in the FOOT mode, only the foot door 22 is opened and air is blown out from the footwell outlet 19 only to the occupant's feet, and in the HEAT mode, the foot door 21 and the defroster door 20 are opened. Air is blown out from the foot air outlet 19 and the defroster air outlet 17, and when in the defroster (DEF) mode, air is blown out from the defroster air outlet 17 to clear fog and frost from the wind.

[Table] According to the above-described embodiment, in the bend mode during normal cooling, the air taken in from each of the inlet ports 6 and 7 as the blower fan 9 rotates is cooled by the evaporator 10, and the air is cooled by the evaporator 10. Depending on the degree of opening, part of the air passes through the heater core 10 and is heated, and is mixed with the cold air that has bypassed the heater core 10 in the air mixture chamber 16 to reach an appropriate temperature, and then the vent door 21 is heated. The air is supplied from the vent communication port 18, which is more open, through the vent duct 5, and from the vent outlet 24 into the vehicle interior. Therefore, when the air mix door 12 is in a state where the heater core 11 is fully closed in the vent mode (maximum cooling state), the bypass door 15 and the vent door 21 are opened as shown in the table, and the bypass communication port 13 and the vent communication are opened. Since the mouth 18 is fully open,
Air cooled by the evaporator 10 (cold air)
Most of the air is blown out from the bypass communication port 13, through the vent duct 5, and from the vent outlet 24. Therefore, the temperature control mechanisms such as the heater core 11 and the air mixture chamber 16 do not create resistance to the ventilation of cold air, and the bypass door 15 opens so as not to create resistance to the flow of the air, so that the vent duct 5 is closed. The amount of passing air can be increased, the cooling performance can be further improved, and the amount of air blown out from each vent outlet 24 of the vent duct 5 can be made uniform, improving the air distribution balance. Furthermore, since the ventilation resistance of the cold air can be made relatively small, noise due to the ventilation resistance of the cold air can be prevented even if the air volume is maximized by the blower fan. Effects of the invention As described above, with this invention, a vent duct is installed along the side wall of the heater unit, and a bypass communication port opening into the vent duct is directly connected to the side wall of the heater unit upstream from the heater core. This bypass communication port is equipped with a bypass door that can be opened and closed in a direction that follows the flow of the air, allowing cold air to be sent directly to the vent duct during maximum cooling when the air mix door fully closes the heater core in vent mode. Therefore, the amount of cold air passing through the vent duct can be increased, and the maximum cooling performance can be further improved. In addition, when the bypass door opens, it follows the flow of cold air and opens in a direction that does not create air resistance, so the amount of air blown from the vent outlet can be made uniform, and there is no resistance to the flow path to the vent communication port. The supply of cold air can also be promoted from the vent communication port, and as a result, a large amount of cold air can be blown into the vehicle interior. Furthermore, since there is little ventilation resistance from the communication port of the heater unit to the vent outlet of the vent duct, noise due to ventilation resistance can be prevented.

[Brief explanation of drawings]

Fig. 1 is a schematic configuration diagram showing a vehicle air conditioner according to an embodiment of the invention, Fig. 2 is a perspective view of the same heater unit, Fig. 3 is a perspective view of a bypass door of another embodiment, Figs. FIG. 5 is a schematic configuration diagram of a conventional vehicle air conditioner. 1, 1A... Vehicle air conditioner, 3... Cooling unit, 4... Heater unit, 4b... Side wall, 5, 5A... Vent duct, 9... Blower fan, 10... Evaporator, 11... Heater core, 12... Air mix door, 13... Bypass communication port, 15... Bypass door, 16... Air mix chamber, 17... Defroster outlet,
18...Vent communication port, 20...Defroster door, 21...Vent door, 24...Vent outlet.

Claims (1)

[Scope of utility model registration request] A heater core that heats the cooled air is provided downstream of the cooling unit equipped with an evaporator that cools the inside and outside air taken in by the blower fan, and the amount of air guided to the heater core and the amount of air that bypasses the heater core are controlled. A heater unit is connected to an air mix door and an air mix chamber in which air heated by the heater core and air that has bypassed the heater core join together, and a defroster outlet and a vent communication port are opened in the air mix chamber. In the vehicle air conditioner, the vehicle air conditioner is provided with a defroster door capable of opening and closing a defroster outlet and a vent door capable of opening and closing a vent communication port, and the vent communication port and the vent outlet are connected by a vent duct. The vent duct is provided along the side wall, and a bypass communication port that opens into the vent duct is directly formed in the side wall upstream of the heater core of the heater unit. A bypass door that opens in the following direction is provided so as to be openable and closable, and the air intake to the heater core is blocked, the vent communication port is opened, and the air mix door and the vent door are opened when the amount of air sucked by the blower fan is at its maximum. and a vehicle air conditioner, characterized in that the bypass door connected to the blower fan opens.