JP2004338485A - Air conditioner for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make a blowout air temperature from each blowout opening part of a multimode close to a target temperature by a heat exchanger for heating without providing a plurality of guides. <P>SOLUTION: In an air conditioning unit 10, the heat exchanger 14 constitutes a hot water path in which hot water flowing from left and right hot water inlet parts flows toward the other end side of a tube and flows to a hot water outlet part at the center by U-turning again toward one end side of the tube after U-turning on the one end side of the tube, and the mutimode can be set. In the unit 10, each of foot opening parts 16 is arranged in the vicinities of left and right hot water inlet parts, a defroster opening part 19 is arranged in the vicinity on the other end side of the tube, and face opening parts 20 and 26 are arranged at the substantial center part of the longitudinal direction of the tube. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention includes a control valve for controlling the flow rate or temperature of hot water circulating in a heating heat exchanger, and in a vehicle air conditioner that adjusts the temperature of air blown into a vehicle cabin by the control valve, particularly, in a blow mode. The present invention relates to an improvement for establishing a temperature difference of blown air in each blowout mode when a target value of a temperature difference of blown air is different.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, in a vehicle air conditioner, there are known two methods of controlling the temperature of blown air passing through a heating heat exchanger, a hot water flow control method and a hot water temperature control method.
[0003]
The hot water flow control method is a method of controlling the temperature of the heat exchange section by changing the flow rate of hot water flowing by changing the flow control valve of the heating heat exchanger in an analog manner.
[0004]
On the other hand, in the hot water temperature control method, high-temperature hot water supplied from the cooling system of the engine and low-temperature hot water radiated by the heat exchange unit are mixed by on / off duty control of two valves for heating. In this method, the heat is supplied to a heat exchanger (for example, see Patent Document 1).
[0005]
[Patent Document 1]
Japanese Patent No. 3077301
[0006]
[Problems to be solved by the invention]
By the way, in a vehicle air conditioner, a multi-mode in which air is simultaneously blown from a foot opening, a defroster opening, and a face opening is known. The purpose of this multi-mode is to improve the air-conditioning feeling of the occupant by blowing air into the entire cabin like central heating to bring the entire cabin closer to the occupant's desired temperature. However, even when using either of the conventional heat exchangers for heating in the multi mode, the temperature of the hot water inlet side of the heat exchange section is high and the temperature of the hot water outlet side is low. There is a temperature difference in the blown air temperature depending on the arrangement position of
[0007]
On the other hand, if the temperature of the blown air in the multi mode is the opening of the foot, the opening of the defroster, and the opening of the face in ascending order, the air conditioning is comfortable for the occupant. For this reason, the vehicle air conditioner in which a plurality of guides are arranged so that the foot opening, the defroster opening, and the face opening are arranged in order of the temperature of the blown air by using the temperature difference of the blown air by the present inventors. Was considered as a prototype.
[0008]
However, when a plurality of guides are provided in the vehicle air conditioner, there is a problem in that the air volume is reduced due to pressure loss and a noise is increased, and it has not reached a practical stage.
[0009]
SUMMARY OF THE INVENTION In view of the above, it is an object of the present invention to make the temperature of the air blown out from each of the multi-mode outlets close to the target temperature by a heating heat exchanger without providing a plurality of guides.
[0010]
It is another object of the present invention to provide a configuration in which air that has passed through a high-temperature portion of a heat exchange section of a heating heat exchanger is blown toward the feet of an occupant without providing a long ventilation path.
[0011]
[Means for Solving the Problems]
In order to achieve the above object, according to the first aspect of the present invention, a heating heat exchanger (14) for heating air, and air passing through the heating heat exchanger (14) is directed to an occupant upper body in a vehicle compartment. A face opening (20, 26) for blowing air out, a foot opening (16) for blowing air toward the occupant's feet in the passenger compartment, and a defroster opening (19) for blowing air toward the inside of the vehicle windshield. In the air conditioning unit (10), at least a multi-mode in which air is simultaneously blown out from the foot opening (16), the face opening (20, 26), and the defroster opening (19) can be set. A plurality of tubes (142) through which hot water flows in the exchanger (14) are arranged in parallel, and a first end of the tubes (142) in the longitudinal direction is placed at one end in the tube arrangement direction. The water inlet (150) is provided with a second hot water inlet (151) at the other end in the tube arrangement direction, and the hot water outlet is provided at the center in the tube arrangement direction at the other end in the longitudinal direction of the tube (142). Section (148) is arranged, the hot water from the first hot water inlet (150) flows toward the other end of the tube (142), and the hot water makes a U-turn at the other end of the tube (142), and then the tube A first hot water path (152) which flows toward one end of the tube (142), makes hot water turn again at one end of the tube (142), and then flows toward the hot water outlet (148); Hot water from the second hot water inlet (151) flows toward the other end of the tube (142), and the hot water makes a U-turn at the other end of the tube (142) and then toward one end of the tube (142). Flows and hot water flows A second hot water path (153) that makes a U-turn again at one end of the tube (142) and then flows toward the hot water outlet (148) is formed, and the foot opening (16) is connected to the first and second hot water. The defroster opening (19) is located near the other end of the tube (142), and the face opening (26) is located near the center of the tube (142) in the longitudinal direction. It is characterized by being arranged in a part.
[0012]
By the way, since the hot water before the heat exchange enters the first and second hot water inlets (150, 151), the first and second hot water inlets (150, 151) are compared with the hot water outlet (148). ) Has a higher temperature. According to the first aspect, since the foot opening (16) is arranged near the first and second hot water inlets (150, 151), heat is exchanged with a warm part of the heating heat exchanger (14). Air can be sent to the foot opening (16). Therefore, warm air can be blown from the foot opening (16) toward the feet of the occupant.
[0013]
Then, in the first and second hot water paths (152, 153), the hot water that has reached the other end of the tube (142) exchanges heat with the air blown out from the foot opening (16). (2) The temperature is lower than the hot water at the hot water inlets (150, 151). According to the first aspect, since the defroster opening (19) is disposed near the other end of the tube (142), the hot water having a lower temperature than the hot water at the first and second hot water inlets (150, 151). The air that has exchanged heat with the air can be blown toward the inner surface of the windshield. Thereby, fogging of the windshield can be suppressed.
[0014]
In the first and second hot water paths (152, 153), the hot water in the flow path toward one end of the tube (142) exchanges heat with the air blown out from the defroster opening (19). The temperature is lower than that of the hot water at the other end of (). According to the first aspect, since the face openings (20, 26) are arranged on the downstream side of the air flow in the substantially central portion in the longitudinal direction of the tube (142), the face openings (20, 26) are located at a lower position than the hot water on the other end side of the tube (142). The air that has exchanged heat with low-temperature hot water can be blown toward the upper body of the occupant. Thereby, the blown air having a lower temperature than the temperature of the blown air from the defroster opening (19) can be blown toward the occupant's upper body. For this reason, it is possible to suppress the burning of the upper body including the occupant's head due to heating.
[0015]
As described above, it is possible to not only warm the feet of the occupant, but also to suppress the fogging of the windshield of the vehicle and to suppress the burning feeling of the upper body including the occupant's head, so that air conditioning that is comfortable and comfortable for the occupant can be executed. . In addition, the first and second hot water paths (152, 153) of the heating heat exchanger (14) are devised, and the openings are arranged in accordance with the first and second hot water paths (152, 153). Thereby, without providing a plurality of guides for the temperature difference, the temperature of the air blown out from each opening is increased in the order of the temperature from the foot opening (16), the defroster opening (19), and the face opening (20, 26). can do.
[0016]
According to the second aspect of the present invention, in the first aspect, the face opening (20, 26) is provided with a center face opening (26) for blowing air from a substantially central portion in the vehicle width direction in the vehicle interior toward the upper body of the occupant. And a side face opening (20) for blowing air from both ends in the vehicle width direction in the vehicle compartment toward the upper body of the occupant.
[0017]
According to the third aspect of the present invention, in the first or second aspect, a rear face opening (31) for blowing air toward the upper body of the rear occupant is disposed at a substantially central portion in the arrangement direction of the tubes (142). It is characterized by doing.
[0018]
Thus, in the first and second hot water paths (152, 153), air that has been heat-exchanged with the hot water that has U-turned from one end of the tube (142) can be blown toward the upper body of the rear passenger. Therefore, it is possible to suppress the burning sensation caused by heating the upper body of the rear passenger.
[0019]
According to the fourth aspect of the present invention, in any one of the first to third aspects, an upper opening (21) for blowing air upward in the vehicle interior is disposed at a substantially central portion in the arrangement direction of the tubes (142). It is characterized by doing.
[0020]
Thereby, in the first and second hot water paths (152, 153), air that has been heat-exchanged with the hot water that has U-turned from one end side of the tube (142) can be blown out from the upper opening (21). Therefore, not only can the annoyance of the wind caused by the blown air directly hitting the occupant be suppressed, but also the air on the upper body side including the occupant's head can be made into air with a low temperature.
[0021]
In the invention according to claim 5, a plurality of tubes (142) through which hot water flows are arranged in parallel with the heating heat exchanger (14) for heating air, and the tubes (142) are arranged at one end in the longitudinal direction of the tubes (142). A first hot water inlet (150) is arranged at one end in the arrangement direction, and a second hot water inlet (151) is arranged at the other end in the tube arrangement direction. A tube is formed at the other end in the longitudinal direction of the tube (142). A hot water outlet (148) is arranged at the center in the arrangement direction, and the hot water flowing from the first hot water inlet (150) flows toward the other end of the tube (142), and the hot water flows to the other end of the tube (142). A first hot water path (152) that makes a U-turn at the end side and then flows toward one end side of the tube (142) is formed, and the hot water flowing from the second hot water inlet (151) is supplied to the tube (142). Other end A second hot water path (153) flows toward the one end of the tube (142) after flowing toward the one end of the tube (142) after the hot water makes a U-turn at the other end of the tube (142). The tube arrangement direction of (14) is arranged in the vehicle width direction, and the left foot opening (16) and the right foot opening (16) for blowing air toward the occupant's feet are formed in the first and second hot water inlets ( 150, 151).
[0022]
By the way, as described in claim 1, the temperature near the first and second hot water inlet portions (150, 151) in the first and second hot water paths (152, 153) is the heat exchanger for heating (14). Temperature is higher than the other parts. According to the fifth aspect, the heating heat exchanger (14) is arranged so that the tube arrangement direction is the vehicle width direction, and the temperature near the first hot water inlet (150) of the heating heat exchanger (14). The left foot opening (16) or the right foot opening (16) is arranged at a site where the temperature is high, and the other foot opening (16) is arranged at a site where the temperature is high near the second hot water inlet (151). . For this reason, it is possible to send air that has passed through the high-temperature portion of the heat exchange section to the left and right occupant feet without forming a long ventilation path to blow air to the occupant feet. Further, since the ventilation path of the air blown out from the left and right foot openings (16) can be shortened, the pressure loss of the air volume due to the ventilation path can be suppressed.
[0023]
In addition, the code | symbol in the parenthesis of each said means shows the correspondence with the concrete means described in embodiment mentioned later.
[0024]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic cross-sectional view showing the entire configuration of a vehicle air conditioner according to one embodiment.
[0025]
The vehicle air conditioner is disposed at a substantially central portion inside an instrument panel at a front portion of a vehicle interior, and forms a passage of air flowing toward the vehicle interior. The vehicle air conditioner is roughly composed of two parts, a blower unit (not shown) and an air conditioner unit 10 in FIG. 1. In FIG. Indicates the direction.
[0026]
The blower unit (not shown) has an inside / outside air switching box, and the inside / outside air switching box is provided with an outside air introduction port, an inside air introduction port, and an inside / outside air switching door, and the inside / outside air switching door connects the outside air introduction port and the inside air introduction port. Open and close to switch between outside air and inside air. Further, a blower is arranged below the blower unit.
[0027]
Next, the air-conditioning unit 10 will be described. The case 11 includes a resin case 11, which is formed of a resin having elasticity such as polypropylene and having high mechanical strength. The case 11 is specifically divided into a plurality of divided case bodies for the convenience of removing the mold in molding, the reason for assembling the air conditioner in the case, and the like. It is configured to be fastened together.
[0028]
In the case 11 of the air conditioning unit 10, an evaporator 13 serving as a cooling heat exchanger is vertically arranged behind the air inflow space 12. Therefore, the blown air of the blower unit flows into the air inflow space 12, and then passes through the evaporator 13 from the air inflow space 12 from the front to the rear in the vehicle longitudinal direction. As is well known, a low-pressure refrigerant decompressed by a decompression device such as an expansion valve of a vehicle air conditioning refrigeration cycle flows into the evaporator 13, and the low-pressure refrigerant absorbs heat from the blown air and evaporates.
[0029]
A hot water heater core 14 is disposed behind the evaporator 13 (downstream of the air flow). The heater core 14 is a heating heat exchanger in which air that has passed through the evaporator 13 flows through the air passage of the heater core 14 from the front to the rear, and heats the air using hot water (cooling water) from a vehicle engine as a heat source. It is. The heater core 14 will be described later in detail.
[0030]
The heater core 14 is smaller than the passage cross-sectional area in the case 11 and is arranged in the case 11 so as to be deviated toward the upper side of the vehicle. Thus, a cool air bypass passage 15 through which air bypasses the heater core 14 and is formed below the heater core 14 in the vehicle.
[0031]
At the rear side (downstream of the air flow) of the heater core 14, foot openings 16 are arranged on both left and right end faces of the case 11 in the vehicle width direction. A rectangular foot door 17 is arranged in the vicinity of the foot opening 16, and the rotating shaft 18 is rotated and driven by an actuator 18a (FIG. 2) to be opened and closed. The foot opening 16 is connected to a foot duct (not shown). The upper side of the foot duct in the vehicle vertical direction is connected to the front seat side foot duct, and the lower side thereof is connected to the rear seat side foot duct. The front-seat foot duct is configured to blow conditioned air toward the feet of the front-seat occupant, and the rear-seat foot duct is configured to blow conditioned air toward the feet of the rear-seat occupant.
[0032]
A plurality of blowout openings, that is, a defroster opening 19, a side face opening 20, and an upper opening 21 (hereinafter, referred to as an indirect opening 21) are arranged above the case 11 (the downstream end of the air). .
[0033]
The defroster opening 19 blows out conditioned air toward the inner surface of the vehicle windshield through a defroster duct (not shown). As shown in FIGS. 1 and 3, the defroster opening 19 is disposed over the heater core 14 and over the entire area of the case 11 in the vehicle width direction. Have been. A rotatable rectangular defroster door 22 is disposed in the defroster opening 19, and the rotating shaft 23 is rotated and driven by an actuator 23a (FIG. 2) to be opened and closed. FIG. 3 is a schematic view taken in the direction of arrow A in FIG.
[0034]
The side face opening 20 blows out conditioned air from both ends in the width direction of the instrument panel on the front seat side of the vehicle toward the occupant through a side face duct (not shown). They are arranged at the left and right ends in the direction. A rotatable rectangular side face door 24 is disposed on each of the left and right sides of the side face opening 20, and the rotating shaft 25 is rotated by an actuator 25a (FIG. 2) to be opened and closed. I have.
[0035]
The indirect opening 21 is an opening that blows out conditioned air upward of the vehicle via an indirect duct (not shown). Since the conditioned air is blown upward in this manner, the conditioned air is not directly blown out to the occupant, so that a mild and comfortable air-conditioning feeling that does not cause the trouble of the wind can be provided. The indirect opening 21 is arranged at the center of the defroster opening 19 on the vehicle rear side in the vehicle width direction. A rotatable rectangular indirect door (not shown) is arranged in the indirect opening 21, and its rotation shaft is rotated and driven by an actuator 21a (FIG. 2) to be opened and closed. .
[0036]
A center face opening 26 is arranged on the upper side of the case 11 and on the vehicle rear side of the side face opening 20 and the indirect opening 21. The center face opening 26 is an opening for blowing out conditioned air toward the upper body of the occupant on the front seat side of the passenger compartment through a center face duct (not shown). A rotatable rectangular center face door 27 is disposed in the center face opening 26, and the rotating shaft 28 is rotated and driven by an actuator 28a (FIG. 2) to be opened and closed. The ratio of the air from the heater core 14 to the air from the heater core 14 is adjusted. Further, a cool air bypass door 29 for adjusting the amount of air passing through the cool air bypass passage 15 is disposed in the cool air bypass passage 15, and the rotation shaft 30 is rotationally driven by an actuator 30a (FIG. 2) to open the center face opening. The airflow to 26 is adjusted.
[0037]
A rear seat side face opening 31 is arranged below the case 11 and downstream of the foot opening 16 in the air flow. The rear-seat side face opening 31 is an opening for blowing out conditioned air toward the upper body of a rear-seat occupant in the vehicle cabin through a rear-seat side face duct (not shown). A rotatable rectangular rear-seat side face door 32 is disposed in the rear-seat side face opening 31 so that the rotating shaft 33 is rotated and driven by an actuator 33a (FIG. 2) to be opened and closed. Has become.
[0038]
Actuators 18a, 21a, 23a, 25a, 28a, and 33a for independently controlling the rotating shafts 18, 23, 25, and 28 are provided on the respective doors 17, 22, 24, 27, and 32 for setting the blowing mode. Have. For this reason, many blowout modes can be set, and the blowout modes that can be set in the automatic control include, for example, a face mode, a foot mode, a defroster mode, a foot differential mode, and a multi mode.
[0039]
The face mode is a blowing mode in which air is blown from the center face opening 26, the side face opening 20, the defroster opening 19, and the rear seat side face opening 31. The air flow rate in the face mode is, for example, about 30% on the center face opening 26 side, about 25% on the side face opening 20 side, about 20% on the defroster opening 19 side, and about 20% on the rear seat side. It is about 25% on the face opening 31 side.
[0040]
The foot mode is a blowing mode in which air is mainly blown out from the foot opening 16 side and a small amount of air is blown out from the defroster opening 19 side. The air flow rate in the foot mode is, for example, about 40% on the left and right front foot duct sides, about 40% on the right and left rear foot duct sides, and about 20% on the defroster opening 19 side. Also, a small amount of air may be blown out from the side face opening 20.
[0041]
The defroster mode is a blowing mode in which air is mainly blown from the defroster opening 19. The air volume ratio in the defroster mode is, for example, about 80% on the defroster opening 19 side and about 20% on the foot opening 16 side. Also, a small amount of air may be blown out from the side face opening 20.
[0042]
The foot differential mode is a mode in which air is blown to the foot opening 16 side and the defroster opening 19 side. The air flow rate in the foot differential mode is, for example, about 70% from the foot opening 16 side and about 30% from the defroster opening 19 side. The air blown out from the foot opening 16 is branched in the duct, and blows out about 35% of the air toward the front passenger foot and about 35% of the air toward the rear passenger foot. Is also good.
[0043]
The multi mode is a blowing mode in which air is blown from the center face opening 26, the side face opening 20, the rear seat side face opening 31, the foot opening 16, the indirect opening 21, and the defroster opening 19. The air flow rate in the multi mode is, for example, about 20% on the center face opening 26 side, about 10% on the side face opening 20 side, about 15% on the rear seat face opening 31 side, and about 15% for the indirect opening. It is about 15% on the 21 side, about 10% on the defroster opening 19 side, and about 30% on the foot opening 16 side. The air blown out from the foot opening 16 is branched inside the left and right ducts, and is about 7.5% toward the front left occupant's feet, about 7.5% toward the front right occupant's feet, and the rear seat. It may be configured such that about 7.5% of air is blown toward the left occupant's feet and about 7.5% of air is blown toward the rear occupant's right feet.
[0044]
The air volume ratio of these openings 16, 19, 20, 21, 26, 31 varies depending on the season. For example, when the outside air temperature is low, the air volumes of the foot opening 16 and the center face opening 26 are reduced. The ratio is larger at the foot opening 16 and the air flow ratio at the center face opening 26 increases as the vehicle interior temperature approaches the target temperature.
[0045]
If any one of the blow-out modes is selected, and this blow-out mode changes to another blow-out mode, control is performed so that the amount of air blown from the blow-out opening changes smoothly with the passage of time. are doing. Specifically, a case will be described in which the blowing mode in which the center face opening 26 is opened and the foot opening 16 is closed is changed to the blowing mode in which the center face opening 26 is closed and the foot opening 16 is opened. In the switching of the blowing mode, the amount of air blown from the center face opening 26 is reduced with time, and the amount of air blown from the foot opening 16 is increased with time.
[0046]
When there is no occupant on the rear seat side, the rear face opening 31 and the rear seat foot duct can be closed by an operation member (not shown) so that air can be blown only to the front seat side.
[0047]
Next, an outline of the electric control unit according to the present embodiment will be described with reference to FIG. 2. The ECU 50 includes a well-known microcomputer including a CPU, a ROM, a RAM, and the like and peripheral circuits thereof. Power is supplied from a vehicle-mounted battery via an ignition switch (not shown) of the vehicle engine.
[0048]
A detection signal is input from the sensor group 70 to the ECU 50 for air conditioning control. These sensors include a water temperature sensor 71 for detecting an engine cooling water temperature Tw, an inside air sensor 72 for detecting an inside air temperature Tr, an outside air sensor 73 for detecting an outside air temperature Tam, a solar irradiation sensor 74 for detecting an amount of solar radiation Ts, and an evaporator 13. , An evaporating air temperature sensor 75 for detecting an air temperature Te (hereinafter, referred to as an after-evaporator temperature) Te, a reheat temperature feedback sensor 76 for detecting a hot water temperature Thc flowing through the heater core, and a center face cold air temperature Tcf. A center face temperature sensor 77 is provided.
[0049]
The switches of the air-conditioning operation panel 80 include a temperature setting switch 81 that generates a signal of a set temperature Tset, an air volume switch 82 that generates an air volume switching signal of a blower (not shown), an inside / outside air switch 83 that generates an inside / outside air switching signal, and not shown. An air conditioner switch 84 for generating an on / off signal for an electromagnetic clutch of the compressor, an auto switch 85 for generating an automatic signal for setting an automatic control mode of air conditioning, and a blow mode switch 86 for setting a blow mode are provided.
[0050]
Next, the configuration of the heater core 14 will be described in detail. In the present embodiment, a heater core 14 of a hot water flow control system having a flow control valve (not shown) for controlling the flow rate of hot water is disposed in the vehicle air conditioner.
[0051]
As shown in FIG. 4, the heater core 14 is roughly composed of a core portion 141, an upper tank 140a, and a lower tank 140b which are arranged in parallel with the air flow direction. FIG. 4 schematically illustrates a cross-sectional shape of the heater core 14.
[0052]
The core portion 141 includes a large number of tubes 142 having a hot water passage (fluid passage) through which hot water flows, and corrugated fins 143 arranged and joined between the large numbers of tubes 142. Further, a side plate 145 as a reinforcing member is provided further outside the outermost fin 143 in the left-right direction.
[0053]
A central tube 144 having a larger cross-sectional area than the tubes 142 is provided at a central portion of the tubes 142 arranged in plurals. A core plate 146 having a rim portion formed on the outer periphery and a plurality of tube holes formed in a flat portion is disposed at both ends in the longitudinal direction of each tube 142 and the center tube 144. Both longitudinal ends of the 144 are fitted into and joined to the tube holes. Further, both ends in the longitudinal direction of the side plate 145 are fitted to the plane portion of the core plate 146.
[0054]
The upper tank 140a and the lower tank 140b are containers each having a rectangular parallelepiped outer shape, and open to the core plate 146 side, and the openings are respectively fitted to and joined to the rim portions of the core plate 146.
[0055]
Inside the upper tank 140a, two partition plates 147 are provided so as to sandwich the central tube 144, and divide the internal space into an upper left tank portion 140c, a central upper tank portion 140d, and an upper right tank portion 140e. In the ceiling of the upper tank 140a, an outlet pipe 148 is provided in the center upper tank 140d between the two partition plates 147. Accordingly, the left and right tank portions 140c and 140e in the upper tank 140a communicate with the left and right tubes 142, respectively, and the central upper tank portion 140d communicates with the central tube 144 and the outlet pipe 148.
[0056]
Inside the lower tank 140b, two partition plates 149 are provided near the both ends in the longitudinal direction of the lower tank 140b to partition this internal space into three parts, a lower left tank part 140f, a central lower tank part 140g, and a lower right tank part 140h. Is provided. A first inlet pipe 150 and a second inlet pipe 151 are provided at both ends of the lower tank 140b, that is, at the lower left tank section 140f and the lower right tank section 140h. Therefore, the left and right tank portions 140f and 140h in the lower tank 140b communicate with the left and right tubes 142, respectively, and the central lower tank portion 140g communicates with the other tubes 142 and the central tube 144.
[0057]
As described above, the hot water flowing from the first inlet pipe 150 and the second inlet pipe 151 is partitioned by the left and right partition plates 149 of the lower tank 140b, and flows toward the upper tank 140a through the tube 142. ing. Therefore, by changing the positions of the left and right partition plates 149, the path of the hot water flowing from the first inlet pipe 150 and the second inlet pipe 151 and flowing toward the tube 142 can be changed. That is, the upper and lower tanks 140a and 140b, the partition plates 147 and 149, the tube 142, and the center tube 144 form hot water paths 152 and 153 that make a U-turn in the left and right directions of the heater core 14. Although the hot water paths 152 and 153 are drawn at the corrugated fins 143 in the left and right cores for the sake of convenience in understanding the drawing, the hot water actually flows inside the tube 142. . Also, the number of tubes 142 is actually different from the number shown in FIG.
[0058]
Next, the operation of the air conditioning unit 10 having the above configuration will be described.
[0059]
When the ignition switch of the vehicle engine (not shown) is turned on and power is supplied to the ECU 50, the automatic switch 85 of the air-conditioning operation panel 80 is turned on to start the execution of the automatic control of the air-conditioning.
[0060]
In the automatic control of the air conditioning, the target outlet temperature TAO is calculated from the input from the air conditioning sensor group 70. Then, when TAO is, for example, 22 ° C., a multi-mode in which air is blown out from the center face, side face, rear face, indirect, foot, and defroster outlets is executed.
[0061]
On the other hand, after starting the vehicle engine, warm water (internal fluid) from an engine (not shown) flows into the heater core 14 from the first and second inlet pipes 150 and 151 into the left and right tank portions 140f and 140h of the lower tank 140b. Then, the tubes 142 at the left and right end portions flow upward, the U-turn is performed at the left and right tank portions 140c and 140e of the upper tank 140a, the central tube 144 flows upward, and the central upper tank portion of the upper tank 140a is formed. It flows out of the outlet pipe 148 via 140d.
[0062]
At the same time, the air volume of a blower fan (not shown) is determined, and a blower voltage is applied to the blower fan. Then, a predetermined amount of air is blown toward the air inflow space 12 of the air conditioning unit 10, and the blown air is cooled by the evaporator 13 and then reheated by passing through the core portion 141 of the heater core 14. The reheated air is blown out toward the vehicle cabin from the opening that is opened based on the selected blowing mode.
[0063]
Next, the operation and effect of the present embodiment will be described.
[0064]
(1) FIG. 5 is an explanatory diagram for explaining the temperature distribution of the heater core 14. In this explanatory diagram, the first range a to the fourth range d are shown in ascending order of the temperature distribution of the core portion 141 of the heater core 14, and the ranges having the lowest temperatures are shown as the fifth and sixth ranges e and f.
[0065]
As shown in FIG. 5, the hot water before the heat exchange flows into the first range a near the lower tank 140b, so that the temperature is warmer than the temperature near the central tube 144 near the outlet of the flow path. Since the foot openings 16 are arranged near the warm first area a and at both end surfaces in the vehicle width direction of the air conditioning unit 10, the blown air that has exchanged heat with the warm portion of the heater core 14 is blown to the foot openings 16. it can. Therefore, warm air can be blown out from the foot opening 16 toward the foot of the occupant.
[0066]
Subsequently, hot water from the inlet of the lower tank 140b is carried from the flow path of the tube 142 toward the upper tank 140a. Therefore, the temperature of the second range b is slightly lower than that of the first range a. By arranging the defroster opening 19 near the upper tank 140a downstream of the air flow in the left and right second ranges b, the air that has exchanged heat with the second ranges b can be blown out toward the inner surface of the windshield. Therefore, not only the occurrence of fogging of the windshield can be suppressed, but also the feeling of hotness of the occupant's upper body due to too warm air can be suppressed.
[0067]
Next, warm water from the inlet of the lower tank 140b is carried from the flow path of the tube 142 to the upper tank 140a. At this time, the temperature in the third range c below the upper tank 140a is lower than in the first and second ranges a and b. Accordingly, when the left and right side face openings 20 are respectively disposed, warm air can be blown out of the third range c toward a portion of the occupant's upper body in the passenger compartment from the door. For this reason, it is possible not only to suppress the occurrence of fogging on the inner surface of the side glass (not shown), but also to suppress the burning sensation of the occupant's upper body due to too warm air.
[0068]
Next, the hot water that has undergone heat exchange in the third range c flows through the tube 142 toward the lower tank 140b. The fourth range d is a range below this flow path. On the other hand, since the face opening 26 is disposed substantially at the center in the vehicle width direction, the air that has exchanged heat with the fourth range d having a lower temperature than the third range c can be blown toward the occupant's upper body.
[0069]
Next, the warm water exchanged in the fourth range d is carried to the lower tank 140b and finally flows into the central tube 144. For this reason, the fifth range e and the sixth range f formed at the center of the flow path are the lowest temperature ranges among the first range a to the sixth range f. On the other hand, since the indirect opening 21 and the rear-seat side face opening 31 are disposed substantially at the center of the air conditioning unit 10 in the vehicle width direction, the temperatures from the fifth range e and the sixth range f where the temperature is low are reduced. The blown air can be blown toward the ceiling or the upper body of the rear passenger. In addition, the fifth range e and the sixth range f include a range of the flow path from the upper tank 140a to the lower tank 140b, a part from the central tube 144 and a flow path from the central tube 144 to the outlet pipe 148.
[0070]
As described above, in a blowing mode that blows out from a plurality of openings, for example, a blowing mode such as a foot differential mode or a multi-mode, air blown out from each opening can be blown toward the vehicle interior with a temperature difference.
[0071]
By the way, as described above, the first range a to the sixth range f, which are the temperature distribution of the heater core 14, are constituted by the hot water paths 152 and 153. The hot water paths 152 and 153 can be changed by changing the position of the partition plate 149. That is, the temperature distribution of the heater core 14 can be adjusted by changing the position of the partition plate 149.
[0072]
(2) Since the vehicle air conditioner is disposed inside the instrument panel at the front of the vehicle cabin, if the foot opening 16 is disposed on the surface of the air conditioning unit 10 in the vehicle width direction, the foot is positioned to the left and right passenger seats. The opening 16 will be arranged. For this reason, it is possible to reduce the duct bending portion to the foot portion of the occupant seat, so that the pressure loss during blowing can be reduced.
[0073]
(3) Since the cool air can be directly introduced into the center face opening 26 from the cool air bypass passage 15, the temperature of the air blown out from the center face opening 26 can be reduced regardless of the temperature distribution of the heater core 14. Thereby, the temperature difference between the center face opening 26 and each opening in the above-described blowing mode can be adjusted.
[0074]
(4) The foot duct (not shown) provided in the foot opening 16 is branched up and down so that the upper side is sent to the feet of the occupant on the front seat side and the lower side is sent to the feet of the occupant on the rear seat side. Make up. For this reason, since the ventilation path of the rear seat side foot duct (not shown) is longer, heat exchange between the rear seat side foot duct and the blowing air lowers the temperature of the blowing air. Therefore, the air below the foot duct, that is, the air that has passed through the warm portion of the heater core 14 is blown, so that the temperature of the air can be made closer to the front seat side. In addition, since air having a temperature difference is simultaneously blown out from the rear seat side face opening 31 and the rear seat side foot duct, only air having a temperature difference can be blown out from each opening on the front seat side. In addition, air with a vertical temperature difference can be simultaneously blown to the rear seat side.
[0075]
(5) Each of the openings 16, 19, 20, 21, 26, and 31 is provided with an actuator 18a, 21a, 23a, 25a, 28a, 33a capable of independently controlling the opening area. Various blowing modes can be set by operating the occupant.
[0076]
(Other embodiments)
(1) In the embodiment of the present invention, the partition plate 147 is provided on the upper tank 140a, but the central tube 144 and the upper tank 140a may be joined to eliminate the partition plate 147.
[0077]
{Circle around (2)} In the embodiment of the present invention, the partition plate 149 is provided in the second tank 140b, and hot water flows in from both ends of the second tank 140b. In the present embodiment, two tanks may be provided in place of the second tank 140b, and hot water inlets may be provided at both ends in the width direction of the heater core 14 of the two tanks to completely separate the flows.
[0078]
{Circle around (3)} In the embodiment of the present invention, the heater core 14 is arranged so that the longitudinal direction of the tube 142 is the vertical direction of the vehicle to form a ventilation passage through which air passes from the front to the rear of the vehicle. In the present embodiment, the longitudinal direction of the tube 142 of the heater core 14 may be arranged in the front-rear direction of the vehicle to form a ventilation passage through which air passes upward from below the vehicle.
[0079]
(4) In the embodiment of the present invention, the heater core 14 of the hot water flow control method has been described. However, in the present embodiment, a heater core of the hot water temperature control method for controlling the temperature of the hot water may be used.
[Brief description of the drawings]
FIG. 1 is an overall configuration diagram of an air conditioning unit according to an embodiment of the present invention.
FIG. 2 is an overall configuration diagram including an outline of an electric control unit in FIG. 1;
FIG. 3 is a schematic view taken in the direction of arrow A in FIG. 1;
FIG. 4 is a schematic sectional view of the heater core of FIG.
FIG. 5 is an explanatory diagram illustrating a temperature distribution of the heater core of FIG. 1;
[Explanation of symbols]
10 air conditioning unit, 14 heater core, 16 foot opening,
19: defroster opening, 20: side face opening,
26 center opening, 140a upper tank, 140b lower tank
142 ... tube, 147, 149 ... partition plate.

Claims (5)

A heat exchanger (14) for heating the air,
A face opening (20, 26) for blowing air that has passed through the heating heat exchanger (14) toward the upper body of the occupant in the vehicle compartment;
A foot opening (16) for blowing the air toward the occupant's feet in the passenger compartment;
An air conditioning unit (10) having a defroster opening (19) for blowing the air toward the inner surface of the vehicle windshield,
At least a multi-mode in which air is simultaneously blown from the foot opening (16), the face opening (20, 26), and the defroster opening (19) can be set,
A plurality of tubes (142) through which hot water flows in the heating heat exchanger (14) are arranged in parallel,
At one end in the longitudinal direction of the tube (142), a first hot water inlet (150) is arranged at one end in the tube arrangement direction, and a second hot water inlet (151) is arranged at the other end in the tube arrangement direction. And
A hot water outlet (148) is arranged at the other end of the tube (142) in the longitudinal direction at the center in the tube arrangement direction,
Hot water from the first hot water inlet (150) flows toward the other end of the tube (142),
The hot water makes a U-turn at the other end of the tube (142) and then flows toward one end of the tube (142);
A first hot water path (152) in which the hot water flows again toward the hot water outlet (148) after making a U-turn at one end of the tube (142) again;
Hot water from the second hot water inlet (151) flows toward the other end of the tube (142),
The hot water makes a U-turn at the other end of the tube (142) and then flows toward one end of the tube (142);
A second hot water path (153) in which the hot water flows again toward the hot water outlet (148) after making a U-turn at one end of the tube (142) again;
The foot openings (16) are arranged near the first and second hot water inlets (150, 151), respectively.
Disposing the defroster opening (19) near the other end of the tube (142);
The air conditioner for a vehicle, wherein the face opening (26) is arranged at a substantially central portion in a longitudinal direction of the tube (142). A center face opening (26) for blowing air from a substantially central portion in the vehicle width direction of the vehicle interior toward the upper body of the occupant;
The vehicle air conditioner according to claim 1, further comprising a side face opening (20) for blowing air from both ends in the vehicle width direction of the vehicle interior toward the upper body of the occupant. The rear seat-side face opening (31) that blows air toward the rear seat-side occupant upper body is disposed at a substantially central portion in the arrangement direction of the tubes (142). Vehicle air conditioner. 4. An upper opening (21) for blowing air upward in a vehicle interior at a substantially central portion in the arrangement direction of the tubes (142). Vehicle air conditioner. A plurality of tubes (142) through which warm water flows are arranged in parallel in a heating heat exchanger (14) for heating air,
At one end in the longitudinal direction of the tube (142), a first hot water inlet (150) is arranged at one end in the tube arrangement direction, and a second hot water inlet (151) is arranged at the other end in the tube arrangement direction. And
A hot water outlet (148) is arranged at the other end of the tube (142) in the longitudinal direction at the center in the tube arrangement direction,
The hot water flowing from the first hot water inlet (150) flows toward the other end of the tube (142),
A first hot water path (152) in which the hot water flows toward the one end of the tube (142) after making a U-turn at the other end of the tube (142);
The hot water flowing from the second hot water inlet (151) flows toward the other end of the tube (142),
A second hot water path (153) in which the hot water flows toward the one end of the tube (142) after making a U-turn at the other end of the tube (142);
The heating heat exchanger (14) is arranged such that the tube arrangement direction is the vehicle width direction,
A vehicle, wherein a left foot opening (16) and a right foot opening (16) for blowing the air toward the occupant's feet are arranged near the first and second hot water inlets (150, 151), respectively. Air conditioner.

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