JPH053364Y2 - - Google Patents

Description

[Detailed explanation of the invention] (a) Industrial application field This invention relates to a vehicle air conditioner.

(b) Technical background and problems Conventionally, this type of vehicle air conditioner was
There are those shown in FIG. 5, FIG. 6, and FIG.

First, in the conventional example shown in FIG. 4, the air flowing into the heater unit 5 is divided into upper and lower parts by the main air mix door 9, with the upper flow flowing as cold air and the lower flow flowing into the heater core 7.
While passing through the air, the air is heated and flows as warm air, and the two are mixed in the air mix chamber 25 downstream thereof. However, in this conventional example, the cold air and hot air flow in the air mix chamber 25 in a substantially parallel state, resulting in poor mixing of the two, which tends to make it difficult to obtain good temperature control.

On the other hand, as shown in FIG. 5, the aperture guides 47, 47 at the inlet of the air mix chamber 25 are extended inward to the heater unit 5 for a considerable length to improve the mixing properties of cold air and hot air. Something has been proposed. However, in this case, the cold air path 1 during cooling or ventilation is extremely constricted, and the resistance to the air flow inside the heater unit 5 is too large, so there are disadvantages such as the need to increase the capacity of the blower. I was afraid that I would come out.

Further, as shown in FIG. 6, the heater core 7 in the heater unit 5 forming the cold air path 1 and the hot air path
In the main air mix door 9, the amount of air introduced into the heater core 7 can be adjusted by opening and closing the hot air path 3.
A sub air mix door 11 which can open and close the cold air passage 1 is provided on the inner wall surface of the heater unit 5 facing the main air mix door 9 to face the air inflow direction. It has been proposed that both doors 9 and 11 are interlocked so that they maintain a substantially parallel relationship (Jikko Sho 59).
-Refer to Publication No. 2969). In the case of this conventional example, the main air mix door 9 is adjusted in the direction of closing the hot air path 3, and when the air flow to the cold air path 1 on the sub air mix door 11 side increases, the sub air mix door 9 is adjusted in the direction of closing the hot air path 3. By interlocking the sub air mix door 11 to open, the sub air mix door 11 is less likely to become a resistance, and at the same time, the sub air mix door 11
The mixing properties of cold air and hot air can be improved by the guiding action of . However, the main air mix door 9 and the sub air mix door 11 are interlocked in both opening and closing directions by an interlocking link, and after adjusting the opening and closing of the main air mix door 9, the main air mix door 11 is opened and closed. Since the relative position with respect to the mixer door 9 is fixed in both the open and close directions, when the rotation of the blower is increased to increase the air volume, this increased air flow is transferred to the passage area by the sub air mix door 11. There was a problem in that the wind was forced to pass through the reduced cold air path 1, and large wind noise was generated, disturbing the quietness in the vehicle interior.

For such problems, Utility Model Application No. 52-137447
Applying what is described in the above issue, the sub air mix door 11 is constructed to be always biased in the closing direction by a spring, and when the air volume increases rapidly at the position shown in Fig. 6, the sub air mix door 11 is biased by the spring. It is conceivable to retract in the opening direction against the bias of , and expand the passage area as appropriate.

However, if a spring is provided in the sub air mix door 11 based on a structure in which the bases of the doors 9 and 11 are interlocked and connected by a link as shown in FIG. It is necessary to provide a stopper which is relatively rotatable in the closing direction and which receives the biasing force of the spring at the position shown in FIG. 6, for example, and positions it relative to the link. Furthermore, the link merely connects the base sides of both doors 9, 11, and the spring biasing force is directly applied to the force for opening and closing both doors 9, 11, so that it is difficult to move both doors 9, 11 smoothly. Requires great operating force. Therefore, when the main air mix door 9 is driven by an actuator to interlock both doors 9 and 11, a large main air mix door actuator is required. Further, when the sub air mix door 11 retreats in the opening direction against the spring biasing force due to the large air volume, it returns to the closing direction again due to the spring biasing force and is supported by the stopper. The door 11 may vibrate for a long time.

(c) Purpose of the invention This invention was created by focusing on the problems of the conventional technology.It has good mixing properties between cold air and hot air, can suppress the increase in ventilation resistance, and can reduce the change in air volume. To provide an air conditioner for a vehicle that can reduce the generation of wind noise regardless of the situation, does not require a special stopper, and can reduce operating force and suppress vibration.

(d) Structure of the device In order to achieve this objective, this device has a cold air path that is directly connected to the hot air path that passes through the heater core as the air path downstream of the evaporator, and a base that is connected between the cold air path and the hot air path. a main air mix door that is rotatably supported and whose tip portion is oriented upstream and is movable between a cold air path closed position and a hot air path closed position by said rotation; and a base of said main air mix door. A sub-air mix door whose base part is rotatably supported on the wall across the cold air passage, and whose tip part is oriented downstream and is movable between a cold air passage closed position and an open position by said rotation. , a biasing means for biasing the sub air mix door in the cold air path closing direction; and a support rod for interlocking the door, which is integrally provided on the base side of the main air mix door and whose tip is directed toward the downstream side. The tip of the sub air mix door in the cold air path closed position of the main air mix door is supported by the side of the support rod, and the intersection angle between the two is set to an acute angle, The length of the support rod is formed so that when the main air mix door is in the hot air path closed position, the tip of the support rod supports the front side in the closing direction of the sub air mix door that is in the cold air path open position. And so.

(E) Examples This invention will be explained in detail below based on the drawings.

FIG. 1 is a sectional view showing an embodiment of a vehicle air conditioner according to this invention.

First, to explain the configuration, this vehicle air conditioner has an intake unit 15 having an intake door 13 that selectively introduces air inside the vehicle and outside air.
A blower assembly 21 includes a blower 17 for boosting air introduced from the intake unit 15, and a motor 19 for rotationally driving the blower 17. A cooler unit 23 is provided downstream of this blower assembly 21,
On the downstream side of this cooler unit 23, a cold air passage 1 is provided.
A heater unit 5 is provided which forms a hot air path 3. An air mix chamber 25 is connected downstream of the heater unit 5, and is configured to mix cold air and hot air in the air mix chamber 25 and then let the air flow out depending on the purpose. There is.

Therefore, the air mix chamber 25 is provided with a floor outlet 29 having a floor door 27, a vent outlet 33 having a vent door 31, and a defroster outlet 37 having a defroster door 35.

On the other hand, in the internal hot air path 3 of the heater unit 5, there is a heater core 7 that passes through and heats the air to generate hot air.
is provided. At the upper part of the upstream side of the heater core 7, a main air mix door 9 is rotatably supported, which is arranged facing the air inflow direction and which opens and closes the hot air path 3 to adjust the amount of air introduced into the heater core 7. has been done. Therefore, cold air path 1 and hot air path 3
The base of the main air mix door 9 is rotatably supported between the main air mix door 9 and the main air mix door 9, with its tip oriented toward the upstream side. In addition, the main air mix door 9 is configured to be movable between the closed position of the cold air passage (the position indicated by the two-dot chain line on the upper side of Figure 1) and the closed position of the hot air passage (the position indicated by the two-dot chain line on the lower side of Figure 1). It is becoming. The main air mix door 9 is used to allow air flowing from the cooler unit 23 side to flow into the heater core 7, to block air from flowing into the heater core 7, or to the heater core 7 and the upper side of the heater core 7, that is, the cold air path 1. This is to distribute and flow air as desired to both.

On the upper side of the main air mix door 9, on the wall of the heater unit 5 across the cold air passage 1 from the base of the main air mix door 9, the base is rotatably supported and the tip is oriented downstream. By the rotation, the cold air path can be freely moved between the closed position (the position indicated by the two-dot chain line on the lower side of FIG. 1) and the open position (the position indicated by the two-dot chain line on the upper side of FIG. 1), and the cold air path 1 can be opened and closed. An air mix door 11 is rotatably supported. The sub air mix door 11 controls the opening and closing of the air flow above the heater core 7, that is, in the cold air passage 1, and has the function of improving the mixing properties of hot air and cold air through its guiding action.
The sub air mix door 11 is rotatably supported on the inner wall surface of the heater unit 5 at its base end via a rotation shaft 39, and its distal end is supported by a rotation shaft on the base end side of the main air mix door 9. 41 is supported by a support rod 43 for interlocking the door. That is, the support rod 43 is integrally provided on the base side of the main air mix door 9, and the tip thereof is oriented downstream. The sub air mix door 11 is moved around the cold air path by a torque spring 45 as a biasing means supported by a rotation shaft 39 on the base end side.
is always biased in the direction of closing. Therefore, the sub air mix door 11 is operatively connected to the main air mix door 9, and its movement in the direction of closing the cold air passage 1 is regulated by the support rod 43 at its open position. At the same time, it is in a state in which it can be rotated in the opening direction against the torque spring 45 even with a certain wind pressure.

On the other hand, in the embodiment of this invention, the tip of the sub air mix door 11 in the cold air passage 1 closed position of the main air mix door 9 is supported by the side of the support rod 43, and The intersection angle between the two is set to be an acute angle (see Fig. 1).
Furthermore, when the main air mix door 9 is in the hot air path 3 closed position, the support rod 43 is attached so that the tip of the support rod 43 supports the front side in the closing direction of the sub air mix door 11 that is in the cold air path 1 open position. A length of 43 is formed.

Figure 2 shows the interlocking state between the opening degree θ of the main air mix door 9 from the fully closed position to the fully open position and the opening degree β of the sub air mix door 11 from the fully closed position to the fully open position. The diagonally shaded area in the figure is the area in which the sub air mix door 11 can rotate against the torque spring 45.

Next, the action will be explained.

By providing a sub air mix door 11 for regulating the cold air path 1 at a position facing the main air mix door 9 so as to be openable and closable in the air outflow direction, the main air mix door 11 can be opened and closed in the air outflow direction, for example, when controlling the temperature in the heater mode. When the door 9 is rotated in the opening direction and fixed at the solid line position shown in FIG.
The sub air mix door 11 has a torque spring 4
5, the main air mix door 9 is moved in conjunction with the main air mix door 9, and movement in the direction of closing the cold air passage 1 is restricted by the support rod 43 at the solid line position in FIG. In this state, the sub air mix door 11 can rotate in the opening direction against the torque spring 45, and when the air volume is small, the cold air is guided into the air mix chamber 25 by the guiding action of the sub air mix door 11. The air is mixed with the hot air from the heater core 7 by intersecting it at an angle close to a right angle. As a result, the mixability of hot air and cold air becomes good, and the temperature controllability becomes good. When the air volume is increased by the rotation of the blower 17, the sub air mix door 11 changes the air outflow direction by the wind pressure of the increased amount of air flowing toward the cold air path 1 side.
In other words, it is rotated in the opening direction against the torque spring 45, and air resistance is automatically reduced, resulting in less wind noise (see Figure 2). Further, when the main air mix door 9 is closed to close the hot air path 3 as shown in FIG. 3, the sub air mix door 11 is moved in the opening direction by being pushed by the support rod 43.
During the venting shown in FIG. 3, it is possible to increase the maximum amount of air passing through the cold air path 1 compared to the conventional example in which a large aperture guide is provided.

(f) Effects of the device As is clear from the above, according to the configuration of this device, (1) the mixing of cold air and hot air can be improved by the guiding action of the sub-air mix door, and a large aperture Since no guide is provided, it is possible to suppress the increase in ventilation resistance, and when the air volume is increased, the sub-air mix door can be rotated in the opening direction by wind pressure, automatically reducing air resistance and reducing wind noise. This has the effect of suppressing the occurrence of air flow and being able to respond to changes in air volume.

(2) The tip of the sub air mix door in the cold air path closed position of the main air mix door is supported by the side of the support rod, and the intersection angle between the two is set at an acute angle, so the sub air mix door When trying to move the sub air mix door from the closed position to the open position, the side of the support rod applies force to the tip of the sub air mix door. The influence of the biasing force of the biasing means on the rotational operating force of the rotor can be significantly reduced, allowing extremely smooth operation. Therefore, when operating the main air mix door with an actuator, it is also possible to downsize the actuator.

(3) When the main air mix door is in the hot air duct closed position, adjust the length of the support rod so that the tip of the support rod supports the front side of the sub air mix door in the closed direction when the cold air duct is open. Since it was formed,
Between the closed position and the intermediate open/close position of the sub air mix door, the support rod acts as a support rod for the sub air mix door against the biasing force of the biasing means, and can provide reliable support. Therefore, when the sub air mix door is in the intermediate position between opening and closing, it rotates against the biasing force of the biasing means due to the increase in air volume, and when it moves away from the support rod and is supported again, it is certain that vibrations can be suppressed.

(4) The support rod becomes an interlocking link between the main air mix door and the sub air mix door, and also serves as a stopper for the sub air mix door against the urging force of the urging means, so that the stopper can be omitted. .

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an embodiment of the vehicle air conditioner according to this invention, Fig. 2 is an explanatory view showing the interlocking state of the main air mix door and the sub air mix door, and Fig. 3 is a vent FIG. 4, FIG. 5, and FIG. 6 are partial sectional views showing conventional examples, respectively. 1... Cold air path, 3... Warm air path, 5... Heater unit, 7... Heater core, 9... Main air mix door, 11... Sub air mix door, 4
3...Support rod, 45...Torque spring (biasing means).

Claims (1)

[Scope of utility model registration request] The air path downstream of the evaporator is a direct cold air path and a hot air path that passes through the heater core, and the base is rotatably supported between the cold air path and the hot air path, and the tip is oriented toward the upstream side to rotate. a main air mix door that is movable between a cold air path closed position and a hot air path closed position; , a sub air mix door whose tip portion is oriented downstream and is movable between a cold air passage closed position and an open position by the rotation, and the sub air mix door is biased in the cold air passage closing direction. and a support rod for interlocking the door, which is integrally provided on the base side of the main air mix door and whose tip is directed downstream, when the main air mix door is in the cold air path closed position. The tip of the sub air mix door in the cold air path closed position is supported by the side of the support rod, and the intersection angle between the two is set at an acute angle, so that when the main air mix door is in the hot air path closed position, the support rod is supported. An air conditioner for a vehicle, characterized in that the length of the support rod is formed so that the tip supports the front side in the closing direction of the sub air mix door in the cold air path open position.