JPS5928894Y2 - Internal/external air switching device for vehicle air conditioners - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an inside/outside air switching device in a vehicle air conditioner.

In particular, the present invention relates to an inside/outside air switching device that can automatically switch and adjust an air conditioner to a state in which outside air is introduced or inside air is circulated, or both, when the vehicle is running or idling.

Conventionally, the air conditioner installed inside a vehicle is of the type shown in Figure 1.

This includes an outside air intake 21 connected to the cowl box 1 located at the front of the vehicle, an inside air intake 22 communicating with the interior of the vehicle, and air flowing into the air conditioner from either of these air intakes. The air intake door 2 is equipped with an air intake door 2 that performs an internal/external air switching operation to introduce air.
After passing through the air, it is discharged into the vehicle interior, and after being circulated inside the vehicle, it is discharged from the drafter 5 to the outside.

The conventional example of the inside/outside air switching device of the vehicle air conditioner shown here includes an air intake door 2 and a shaft 20 that connects the air intake door 2 to the air intake door 2 through a shaft 20, as shown in detail in FIG.
The wire 17 is connected to the lever T and transmits an operating force to the lever 7 in order to switch the air intake door 2 between the outside air introduction position and the inside air circulation position.

The wire 17 is connected to an inside/outside air switching member (not shown) located near the passenger, and by operating this, the air intake door 2 is moved between the inside air circulation position A and the outside air introduction position B in FIG.
Selectively fix to one of the following.

Note that some models use a vacuum actuator instead of the wire 17 to operate the air intake door 2.

However, in such a conventional air conditioner for a vehicle, the intake door 2 is fixed at either the inside air circulation position A or the outside air introduction position B while the air conditioner is in operation. Because of this, inconvenient problems occurred depending on the type of car equipped with this air conditioner.

In other words, normally when operating the air conditioner in heater or defroster mode, it is fixed to outside air intake to reduce moisture generated in the cabin due to occupants' exhalation, sweating, etc. If the heater is used as a heater with the external air intake fixed during low-speed driving or idling, the peak amount of heat dissipated will be large compared to the heat generated by the engine, which may lower the engine water temperature and cause insufficient heating.

Therefore, when driving at low speeds, it is necessary to manually switch to internal air circulation, but it is a nuisance for the occupants to frequently perform such an operation while driving the vehicle.

In order to solve this problem, it is also possible to install a device that detects the position of the accelerator pedal and automatically fix the air intake door 2 to the internal air circulation position A in areas where the accelerator pedal is only pressed a little. However, this is not the best solution as it complicates the structure of the air conditioner and increases the price.

The present invention was developed by focusing on the above-mentioned problems, and its purpose is to allow the air intake door to take a fixed position for internal air circulation and a fixed position for introducing outside air, and also to compensate for the pressure difference between the front and back sides of the air intake door. An air conditioner for a vehicle that can adjust the introduced air to inside air, outside air, or a mixture of both according to the traveling speed of the vehicle by having a door operating member that can take a floating position according to the speed of the vehicle. An object of the present invention is to provide an inside/outside air switching device.

The present invention will now be described in detail with reference to the accompanying drawings.

FIG. 3 is a diagram schematically showing a vehicle air conditioner equipped with the inside/outside air switching device of the present invention, and FIG. 4 is an enlarged view of an example of the inside/outside air switching device according to the present invention shown in FIG. 3. This is a diagram.

The vehicle air conditioner shown here includes an air intake box 6 having an outside air intake port 21 and an inside air intake port 22, a proar 3 for sending introduced air toward the inside of the device and a heat exchanger 4, and a heat exchanger. It has an air mix door 13 that performs a switching operation to allow the air coming towards the container 4 to pass through the heat exchange air 4 or the bypass passage 12.

A defroster outlet 14, a heater outlet, and an instrument outlet 16, which serve as outlets for the air that has passed through the heat exchanger 4, etc., are located at the most downstream portion of the air flow.

Inside the air intake box 6, there is an air intake door 2 in order to switch between the inside and outside of the air sent to the air conditioner.
A lever 7 whose one end is fixedly connected to the air intake door 2 via a shaft 20, a rod 11 that engages with the lever 7 via a pin 8 provided at the other end of the lever 7, and this rod. A driving member comprising a wire 17 transmitting driving force to the lever I through 11 and an internal/external air switching device are arranged.

The rod 11 is provided with an elongated hole 10 extending in the direction of its operation, and the lever 1 and the rod 11 are fitted together by fitting the pin 8 of the lever 7 into this elongated hole.

Note that the wire 17 extends to a manual lever (not shown) for switching between inside and outside air that is operated by a passenger, and transmits the operating force from the lever operation to the rod 11.

Because of the above configuration, in the internal/external air switching device according to the present invention, the rod 11 is moved so that the pin 8 of the lever T enters the elongated hole 10 depending on the degree of operation of the manual lever by the occupant. On the other hand, three positions a, b, and c in FIG. 4 can be taken.

When the wire 17 is now moved in the direction of arrow S, the rod 11 descends and engages the pin 8 of the lever 7 at position a.

When the rod 11 is further pushed down in this state, the rod 11
Since the lever 7 is rotated downward about the shaft 20 while the pin 8 is fixed at position a, the air intake door 2 is rotated upward with this rotational movement and fixed at the internal air circulation position A. be done.

This allows the air conditioner to maintain internal air circulation,
For example, when the vehicle is traveling in a tunnel, the interior of the vehicle can be heated while preventing foreign odors from entering the vehicle.

Next, when the wire 17 is moved in the direction opposite to the arrow S, the rod 11 rises and is already in position to engage the pin 8 of the lever 7.

When the rod 11 is further pulled up in this state, the rod 11
The lever 7 is rotated upward around the shaft 20 while the pin 8 is fixed at the position, so the air intake door 2 is rotated downward with this rotational movement and is fixed at the outside air introduction position B. be done.

This allows the air conditioner to keep introducing outside air,
For example, this prevents moisture from accumulating in the vehicle interior due to sweating of the occupants and causing fogging of the glass during normal driving of the vehicle.

Furthermore, by operating the wire 17, when the rod 11 is held at an intermediate position between the two positions described above, the pin 8 of the lever 7 is engaged at the central position C of the elongated hole 10 of the rod 11. However, it becomes possible to move both upward and downward along this elongated hole 10.

Under such conditions, the air intake door 2 can perform a floating movement due to its own weight and the differential pressure between the front side and the back side of the air intake door.

Therefore, for example, when the vehicle is running at high speed, the air intake door 2 takes the outside air introduction position B due to the pressure generated by air flowing from the cowl box 1 into the outside air intake 21, and the air conditioner Keep outside air introduced.

On the other hand, if the vehicle starts to run at low speed with the inside/outside air switching device kept in the air intake door 2 floating state, the pressure of the air flowing into the outside air intake 21 will decrease, but the amount of air fed by the blower 3 will decrease. is constant, the air pressure inside the air intake box 6 of the air intake door 2 decreases relatively, and the air intake door 2 moves to the outside air introduction position B.
It rotates slightly upward from then and reaches intermediate position C1.

As a result, a mixture of air flows into the air conditioner from the outside air intake port 21 and the inside air intake port 22, and is heated by the heat exchanger.

Furthermore, when the vehicle is stopped and idled, the pressure of the air flowing into the outside air intake port 21 becomes close to zero, the air pressure inside the intake box 6 further decreases, and the air intake door 2 moves further upward. It rotates and reaches intermediate position C2.

Therefore, the inside/outside air mixture flowing into the air conditioner has a higher proportion of inside air, and the heat radiation load on the heat exchanger 4 is further reduced.

In diesel engine vehicles, etc., the amount of heat released from the engine decreases as the vehicle moves from high speed driving to low speed driving and then to idling, and the heating capacity of the heat exchanger 4 also decreases accordingly. By using the device with the door floating, it is possible to automatically adjust the rotation of the air intake door 2, making it possible to compensate for insufficient heating in the vehicle interior.

As described above, according to the present invention, in the inside/outside air switching device of an air conditioner, the air intake door can be held in a floating manner according to the pressure difference between the front side and the back side. Accordingly, it has become possible to automatically adjust the internal and external air flowing into the air conditioner, making it possible to prevent insufficient heating in the vehicle interior.

[Brief explanation of the drawing]

Fig. 1 is a diagram schematically showing a vehicle air conditioner equipped with an internal/external air switching device according to the conventional technology, Fig. 2 is a mechanical diagram showing the conventional internal/external air switching device, and Fig. 3 is a diagram of the present invention. FIG. 4 is a schematic diagram of a vehicle air conditioner equipped with an inside/outside air switching device according to the present invention, and FIG. 4 is a mechanical diagram of the inside/outside air switching device according to the present invention. 2...Air intake door, 6...Air intake box, 7...Lever, 8...
... Pin, 10 ... Long hole, 11 ...
・Rod, 17...Wire, 20...
shaft.

Claims (1)

[Scope of utility model registration request] An air intake door 2 that is located in an air intake box 6 of a vehicle air conditioner and switches between outside air introduction and inside air circulation, and a shaft 2 at one end of this air intake door 2.
It consists of a lever 7 that is integrally fixed via a lever 7, and drive members 11 and 17 that engage with the other end of this lever 7 and rotate the air intake door 2 via the lever 7. The lever 7 and the drive members 11, 17 are operatively connected by engagement between a pin 8 provided on one side and a long hole 10 provided on the other side, thereby moving the air intake door 2 to the outside air introduction position or the inside air introduction position. An inside/outside air switching device for a vehicle air conditioner, characterized in that it can be fixed in a circulating position and maintained in a floating position.