JP2004224180A - Air-conditioner for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air-conditioner for a vehicle capable of preventing the cold wind from being heated at the time of maximum cooling without restricting the degree of freedom for the mounting position of an A/M door. <P>SOLUTION: The A/M door 7 of this air-conditioner is furnished with a film member 74 capable of being taken up on a rotary shaft 71. In the maximum cooling operation, the A/M door 7 is put in the condition that the passage through which the cold wind from an evaporator advances to a heater core 2 is closed, and therein the flm member 74 is drawn out of the rotary shaft 71 and protrudes along a guide rib 11 in an opening part 10 in the outlet side of the heater core 2 in such a way that the cold wind directly after passing a bypass passage 6 upon detouring the heater core 2 is hindered from going around to the outlet side of the heater core 2. In the maximum heating operation, the A/M door 7 is positioned as blocking the bypass passage 6, and therein the film member 74 is taken up on the rotary shaft 71 and retreated from an opening 10. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a so-called water valveless type vehicle air conditioner in which hot water is constantly circulated in a heater core.
[0002]
[Prior art]
Air conditioners for vehicles are usually provided with a water valve that regulates the flow of warm water flowing from a cooling water circuit into a heater core.To reduce costs, a water valveless type air conditioner unit that eliminates this water valve is used. It has been put to practical use in recent years. In such a water-valve-less air conditioner unit, even during maximum cooling (Max Cool), warm water circulates through the heater core, so that a portion of the cool air that bypasses the heater core flows around the heater core and is heated, and as a result, is discharged from the outlet. There has been a problem that the temperature of the blown cold air rises.
[0003]
Therefore, as shown in FIG. 7, it has been proposed to provide a guide member 91 on the shaft of the air mix (A / M) door 90 to reduce the flow of the cool air bypassing the heater core to the heater core outlet side. .
[0004]
[Problems to be solved by the invention]
However, when the guide member 91 is provided on the shaft portion of the A / M door 90, the mounting position of the A / M door 90 is limited to the side of the heater core as shown in FIG. The size of the air conditioner unit is reduced in the front-rear direction of the vehicle but is increased in the vertical direction of the vehicle, as compared with the case where the air conditioner unit is provided on the inlet side of the heater core. Depending on the type of the vehicle on which the air conditioner unit is mounted, it may be inconvenient if the size of the air conditioner unit is increased in the vertical direction of the vehicle in such a case. It is desirable that the heater core can be attached to the inlet side of the heater core without being limited to the side surface.
[0005]
The present invention has been made in view of the above points, and has as its object to prevent heating of air bypassing a heater core without limiting the degree of freedom of an A / M door mounting position.
[0006]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, a vehicle air conditioner according to claim 1 includes a heating heat exchanger that circulates hot water from the vehicle engine at all times during operation of the vehicle engine and heats air using the hot water as a heat source. , A bypass passage through which the air bypassing the heating heat exchanger passes, and a first stop position where the rotation of the shaft adjusts all the air to pass through the heating heat exchanger, and an adjustment so that all the air passes through the bypass passage. An air mixing door that moves to an arbitrary position between the second stop position and the air mixing door to adjust a ratio of air passing through the heating heat exchanger to air passing through the bypass passage. When the air mix door is moved to the first stop position, the air mix door is wound around the shaft portion. As the air mix door moves closer to the second stop position from the first stop position, the air mix door becomes closer to the shaft portion. Many extend, it is characterized in that the air bypassing the heating heat exchanger is provided with a flexible member blocking the going around from the bypass passage side to the heating heat exchanger side.
[0007]
In particular, when the air mixing door is a cantilever type door that is rotatably disposed about a shaft at the entrance side of the heating heat exchanger, the flexible member is preferably used. The more the air mix door approaches the second stop position, the more it extends from the shaft to the outlet side of the heating heat exchanger, and the air immediately after passing through the bypass passage goes around the outlet side of the heating heat exchanger. It is configured to block out.
[0008]
According to such a configuration, the more the air mix door is located closer to the second stop position, the more the flexible member extends from the shaft portion, and the air bypassing the heating heat exchanger flows from the bypass passage side. Heating by the heating heat exchanger can be prevented by blocking the heat from flowing into the heating heat exchanger side, thereby avoiding an increase in the temperature of the air blown out from the outlet. Can be.
[0009]
In addition, when the air mix door is at the first stop position, the flexible member is configured to be wound around the shaft of the door. It is possible to prevent the heating of the cool air that bypasses the heating heat exchanger without obstructing the flow of the passing air.
[0010]
Furthermore, according to such a configuration, by providing a member for preventing heating of the air bypassing the heating heat exchanger, the degree of freedom of the mounting position of the air mixing door is not limited, and the heating heat exchanger is not limited. Since the air mixing door can be mounted on the side of the exchanger or on the entrance side, the mounting position of the air mixing door can be selected according to the type of vehicle on which the vehicle air conditioner is mounted.
[0011]
When a film is used as the flexible member, it is possible to prevent heating of cold air by using a more limited space.
[0012]
Further, when a guide member for defining a direction in which the flexible member extends from the shaft portion is provided, the flexible member can be extended in an appropriate direction, and air Can surely be prevented from sneaking into the heating heat exchanger.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
(1st Embodiment)
The vehicle air conditioner according to the first embodiment of the present invention includes an air conditioner unit and a blower unit as a ventilation system, and FIG. The blower unit (not shown) is arranged offset from the center to the passenger seat side in the lower part of the instrument panel in the passenger compartment, and the air conditioner unit 1 is arranged in the left and right direction in the lower part of the instrument panel in the passenger compartment. It is arranged at a substantially central portion of.
[0014]
The blower unit includes an inside / outside air switching box for switching and introducing inside air (vehicle interior air) and outside air (outside vehicle air), and a blower for blowing air introduced from the inside / outside air switching box. The inside / outside air switching box has an inside air suction port and an outside air suction port, and switches the suction mode by driving an inside / outside air switching door provided inside these suction ports by an actuator such as a servomotor. Can be performed. The blower rotates a centrifugal multi-blade fan (sirocco fan) with an electric motor.
[0015]
The air conditioner unit 1 has an evaporator (cooling heat exchanger) 4 and a heater core (heating heat exchanger) 2 built in an air conditioner case 3. The air conditioner case 3 is made of a molded article of a resin having a certain degree of elasticity, such as polypropylene, and also having excellent strength. ) Is a case of four divisions up, down, left and right having a division plane. The upper, lower, left and right four-part case accommodates the evaporator 4, the heater core 2, an air outlet door and an air mix door 7, which will be described later, and is integrally joined by fastening means such as metal spring clips and screws. Is composed.
[0016]
The air conditioner unit 1 is provided with an air inlet 5 at the most forward portion of the vehicle, and the air blown from the blower unit flows into the air passage in the air conditioner case 3 from the air inlet 5. The air inlet 5 is open on the side of the air conditioner case 3 on the passenger seat side so as to be connected to an air outlet of a blower unit disposed at a front part on the passenger seat side of the vehicle.
[0017]
Immediately downstream of the air inlet 5 in the air conditioner case 3, the evaporator 4 is disposed so as to cross the entire area of the air passage. The evaporator 4 cools the air by absorbing the latent heat of evaporation of the refrigerant in the refrigeration cycle from the air. The evaporator 4 is formed by laminating and laminating a number of flat tubes formed by laminating two thin metal plates made of aluminum or the like with corrugated fins interposed therebetween, and brazing integrally. The heat exchange unit is formed by the flat tubes and the corrugated fins. Is composed.
[0018]
Downstream of the evaporator 4 (rear side of the vehicle), the heater core 2 is disposed at a predetermined interval, and the upper end of the heater core 2 is held by a holding unit 9 integrally formed with the air conditioner case 3. I have. The heater core 2 is configured such that high-temperature engine cooling water (warm water) circulates and flows from a cooling water circuit to be described later, and uses the warm water as a heat source to supply conditioned air (cool air) that has passed through the evaporator 4. Heat.
[0019]
The heater core 2 is formed by laminating a plurality of flat tubes formed by joining thin metal plates of aluminum or the like into a flat cross section by welding or the like with a corrugated fin interposed therebetween and brazing integrally. And constitute a heat exchange section.
[0020]
In the air conditioner case 3, a bypass passage 6 is formed above the heater core 2, bypassing the heater core 2 and allowing conditioned air (cool air) to flow therethrough. An air mix (A / M) door 7 is attached to the entrance side of the heater core 2 so as to be rotatable in the vertical direction of the vehicle. By adjusting the stop position of the A / M door 7, the ratio between the amount of air passing through the heater core 2 and the amount of air passing through the bypass passage 6 bypassing the heater core 2 can be adjusted.
[0021]
A cool / hot air mixing space 8 is formed on the downstream side of the bypass passage 6, where the cool air from the bypass passage 6 and the hot air reaching the cool / hot air mixing space 8 from the opening 10 through the heat core 2 are formed. Are mixed by merging. The conditioned air mixed in this way is blown into the vehicle interior. A defroster opening 21, a face opening 22, and a foot opening 23 are formed at the most downstream side of the air conditioner case 3.
[0022]
The defroster opening 21 is connected to a defroster outlet via a defroster duct (not shown), and conditioned air is blown out from the defroster outlet toward the inner surface of the windshield. The face opening 22 is connected to a face outlet through a face duct (not shown), and conditioned air is blown from the face outlet toward the upper body of the occupant. The foot opening 23 is connected to a foot outlet 31 via a foot duct 30. From the foot outlet 31, conditioned air is blown toward the feet of the occupant.
[0023]
An outlet door (not shown) is rotatably provided in each of the defroster opening 21, the face opening 22, and the foot opening 23. These outlet doors are connected via a link mechanism (not shown). The outlet mode can be switched by interlocking operation with an actuator such as a servomotor.
[0024]
FIG. 2 shows a cooling water circuit that circulates hot water through the heater core 2. By a water pump 41 driven by the vehicle engine 40, engine cooling water (hot water) circulates in parallel to the radiator 42 and the heater core 2. Since a water valve for interrupting the flow of warm water from the cooling water circuit to the heater core 2 is not provided, warm water is constantly circulated to the heater core 2 by the water pump 41 when the vehicle engine 40 is operating.
[0025]
The vehicle air conditioner further includes an electronic control device (not shown), and receives switch signals from various switches of an air conditioning operation panel installed in the passenger compartment and sensor signals from various sensors for air conditioning control, Based on this, the position of the inside / outside air switching door, the outlet port, the position of the A / M door 7 and the like are controlled.
[0026]
FIGS. 3A and 3B show a detailed configuration of the A / M door 7. The A / M door 7 has a door substrate portion 70 having a substantially rectangular planar shape, and a rotating shaft (shaft portion) 71 provided on one long side thereof. As shown in FIG. 1, the rotating shaft 71 is disposed on the inlet side of the heater core 2 along the left-right direction of the vehicle, and is rotatably supported by the holding portion 9 of the heater core 2. The rotating shaft 71 protrudes outside the air conditioner case 3 and is connected to an actuator via a link mechanism (not shown). By adjusting the driving angle of the actuator, the stop position of the A / M door 7 is controlled. You.
[0027]
The door substrate 70 is made of a material such as resin, and has a rotating shaft 71 formed integrally therewith. Lip portions 73 are formed on both surfaces of the door substrate portion 70. The lip portion 73 is made of an elastic material, and is provided along three sides of the door substrate portion 70 except for the side where the rotation shaft 71 is provided. When the A / M door 7 closes the entrance to the bypass passage 6 or the entrance to the heater core 2 at the time of maximum cooling or maximum heating, the lip portion 73 comes into close contact with the sealing surface formed integrally with the air conditioner case 3. Thus, the passage is completely closed.
[0028]
A rectangular film-shaped plate (film member) 74 is attached to the rotating shaft 71. The film member 74 has a portion along one long side fixed to the heater core 2 side of the connection portion of the rotation shaft 71 to the door substrate 70 along the periphery of the rotation shaft 71. When the A / M door 7 is at the stop position (first stop position) at the time of maximum heating (at the time of MaxHot), the portion of the film member 74 adjacent to the portion fixed to the rotation shaft 71 is wound around the rotation shaft 71. When the A / M door 7 is closer to the stop position (second stop position) at the time of maximum cooling (at Max Cool), the film member 74 is pulled out from the rotary shaft 71, so that the rotary shaft 71 From the heater core 2 to the outlet side (downstream side), whereby the cool air immediately after passing through the bypass passage 6 bypassing the heater core 2 is blocked from flowing to the heater core 2 outlet side. The thickness of the film member 74 is, for example, about 0.37 mm.
[0029]
FIG. 1 shows a state in which the A / M door 7 is at a stop position at the time of maximum cooling, and FIG. 4 shows an enlarged view of the A / M door 7 at this time. At the time of maximum cooling, the A / M door 7 blocks the passage of the cool air from the evaporator 4 toward the inlet of the heater core 2 such that all the cool air from the evaporator 4 passes through the bypass passage 6 (open arrow in FIG. 4). Is located as follows. When the A / M door 7 is at the stop position, the film member 74 is pulled out from the rotating shaft 71, and as a result, the film member 74 passes through the guide portion provided in the holding portion 9 and passes through the heater core 2. It protrudes into the opening 10 on the outlet side.
[0030]
FIG. 5 is a view of the opening 10 at this time as viewed from the direction of the solid arrow a shown in FIG. As shown here, the film member 74 protrudes along a guide rib (guide member) 11 provided so as to protrude from both sides of the holding portion 9 so as to close a part of the opening 10. Thus, the cold air immediately after passing through the bypass passage 6 bypassing the heater core 2 is blocked by the film member 74 protruding from the opening 10 so as not to flow to the exit side of the heater core 2.
[0031]
FIG. 6 shows a state in which the A / M door 7 is at the stop position at the time of maximum heating (at the time of MaxCool). At the time of maximum heating, the A / M door 7 is positioned so as to close the entrance to the bypass passage 6 so that all the cool air from the evaporator 4 passes through the heater core 2 (open arrows in FIG. 6). When the A / M door 7 is in such a position, the film member 74 is in a state in which a portion adjacent to a portion fixed to the rotation shaft 71 is wound around the rotation shaft 71 and extends along the rotation shaft 71 by about a half circumference. As a result, the film member 74 that has largely protruded from the opening 10 on the outlet side of the heater core 2 during the maximum cooling is retracted from the opening 10. Therefore, the air heated by the heater core 2 flows from the outlet of the heater core 2 to the cold / hot air mixing space 8 through the opening 10 without being obstructed.
[0032]
The film member 74 is attached to the air conditioner case 3 so as to pass through a guide portion in the holding portion 9 when assembling the A / M door 7 to the holding portion 9.
[0033]
According to the configuration of the present embodiment, the closer the A / M door 7 is to the stop position at the time of maximum cooling, the more the film member 74 projects on the exit side of the heater core 2, so that the cool air immediately after passing through the bypass passage 6. Can proceed to the cold / hot air mixing space 8 along the film member 74 without going around the outlet side of the heater core 2. In this way, it is possible to prevent the cool air that has bypassed the heater core 2 from being heated, thereby preventing the temperature of the cool air blown out from the outlet from rising.
[0034]
Further, by using the film member 74, it is possible to prevent the cool air from flowing around the exit side of the heater core 2 by utilizing the limited space, and the A / M door 7 is stopped at the maximum heating stop position. In some cases, the film member 74 is configured to be wound around the rotating shaft 71, so that the flow of warm air through the heater core 2 is not obstructed.
[0035]
(Other embodiments)
The present invention is not limited to the above embodiment, and various modifications are possible as follows.
[0036]
In the above embodiment, the rotary shaft 71 of the A / M door 7 is attached to the inlet side of the heater core 2, but may be attached to the side surface of the heater core 2. As described above, in the vehicle air conditioner of the present invention, by providing the member for preventing the cool air bypassing the heater core 2 from going to the exit side of the heater core 2, the degree of freedom of the mounting position of the A / M door 7 is provided. Without limitation, the A / M door 7 can be attached to the entrance side or the side of the heater core 2. Therefore, the A / M door 7 can be installed depending on the type of the vehicle on which the air conditioner unit 1 is mounted. The mounting position can be selected.
[0037]
Further, in the above-described embodiment, the A / M door 7 is configured to adjust the opening degree of the passage on the inlet side of the heater core 2. However, the A / M door 7 is configured to adjust the opening degree of the passage on the outlet side of the heater core 2. The present invention can also be applied to an air conditioner unit that is in use. In this case, the film member 74 is configured to extend from the A / M door shaft on the outlet side of the heater core 2 to the inlet side of the heater core 2 at the time of maximum cooling, thereby passing through the bypass passage 6 bypassing the heater core 2. It is possible to prevent the cool air from flowing around the inlet side of the heater core 2 and being heated.
[0038]
In the above embodiment, the film member 74 is used as a member for preventing the cool air bypassing the heater core 2 from going to the exit side of the heater core 2. However, the film member 74 can be wound around the rotating shaft 71 of the A / M door 7. A bellows-like member made of a simple resin may be used, or a resin-made member that can be wound around the rotating shaft 71 by a hinge shape may be used.
[0039]
In the above embodiment, the A / M door 7 is a cantilever type plate door. However, the present invention is not limited to this, and a configuration having a shaft for driving the door is adopted as the A / M door. Then, the present invention can be applied. For example, the present invention can be applied to a case where a rotary door is used as an A / M door.
[0040]
In the above-described embodiment, the inside / outside air switching door, the air outlet door, and the A / M door 7 are configured to be driven by an actuator such as a servo motor via a link mechanism. The door may be driven via an operation cable or the like by a manual operation force applied by the occupant to the temperature control lever, the air outlet mode lever, or the like.
[0041]
Further, the present invention can be applied to a vehicle air conditioner in which the evaporator 4 is not provided in the air conditioner unit 1.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view illustrating a state of a maximum cooling of an air conditioner unit of a vehicle air conditioner according to a first embodiment of the present invention.
FIG. 2 is a diagram showing a cooling water circuit for circulating hot water through a heater core shown in FIG.
3A is a front view showing the configuration of the A / M door shown in FIG. 1, and FIG. 3B is a cross-sectional view taken along line III-III of FIG.
FIG. 4 is an enlarged view of an A / M door portion in FIG.
5 is a view of the opening on the heater core outlet side in FIG. 4 as viewed from the direction of the solid arrow a.
FIG. 6 is a cross-sectional view showing a state of an A / M door portion during maximum heating.
FIG. 7 is a sectional view showing an air conditioner unit of a conventional vehicle air conditioner.
[Explanation of symbols]
2 Heater core (heat exchanger for heating)
6 bypass passage 7 air mix door 11 guide rib (guide member)
40 vehicle engine 71 rotating shaft (shaft)
74 film member (flexible member)

Claims (4)

A heating heat exchanger (2) for always circulating warm water from the vehicle engine (40) therein during operation of the vehicle engine (40) and heating the air using the warm water as a heat source;
A bypass passage (6) through which air bypassing the heating heat exchanger (2) passes;
A first stop position in which all the air passes through the heating heat exchanger (2) by the rotation of the shaft portion (71), and a second stop position in which all the air passes through the bypass passage (6). An air mixing door (7) for moving to an arbitrary position between the stop position and adjusting a ratio of air passing through the heating heat exchanger (2) and air passing through the bypass passage (6); Vehicle air conditioner,
The air mixing door (7) is attached to the shaft (71), and when the air mixing door (7) moves to the first stop position, the air mixing door (7) is wound around the shaft (71), As the mix door (7) approaches the second stop position from the first stop position, the air that extends more from the shaft portion (71) and bypasses the heating heat exchanger (2) passes through the bypass passage. An air conditioner for a vehicle, comprising: a flexible member (74) that blocks the air from flowing from the (6) side to the heating heat exchanger (2) side. The air mix door (7) is a cantilevered door that is rotatably disposed on the inlet side of the heating heat exchanger (2) around the shaft (71) as a fulcrum,
The flexible member (74) extends more from the shaft (71) to the outlet side of the heating heat exchanger (2) as the air mix door (7) approaches the second stop position. The vehicle air conditioner according to claim 1, wherein air immediately after passing through the bypass passage (6) is prevented from flowing around to the outlet side of the heating heat exchanger (2). 3. A vehicle air conditioner according to claim 1, wherein said flexible member is a film member. 4. The device according to claim 1, wherein the flexible member comprises a guide member defining a direction in which the flexible member extends from the shaft. 5. Vehicle air conditioner.

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