JPS6235925B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vehicle air conditioner, and in particular,
The present invention relates to an improvement in a vehicle air conditioner in which an evaporator is disposed in an inside air circulation passageway upstream of an air intake door that switches between inside air circulation and outside air introduction.

In general, as shown in Fig. 1, an air conditioner for a vehicle for an inexpensive car includes an air intake box I that has a built-in air intake door 1 and a blower 2 that switch between internal air circulation and outside air intake, and an air intake box A heater unit H that is connected to the air outflow side of the intake box I and has a built-in heater core 3 through which engine cooling water circulates and an air mix door 4 that controls the amount of air distributed to the heater core 3, and an inside air circulation port of the air intake box I. The cooling unit C includes an evaporator 7 disposed in an inside air circulation passage 6 upstream of an air intake door that switches between inside air circulation and outside air introduction connected to the heater unit H. Ducts 8, 9, and 10 leading to the exit are provided, and opening/closing doors 1 are provided in these ducts 8, 9, and 10, respectively.
There is one with numbers 1, 12, and 13. The evaporator 7 includes a compressor 14 operated by engine power, a condenser 15 that condenses refrigerant during cooling, a liquid tank 16 that stores liquid refrigerant, and an expansion valve 1 that rapidly expands the refrigerant.
The evaporator 7 together with the compressor 7 constitutes a cooling cycle, and the evaporator 7 evaporates the refrigerant in the cooling cycle when the compressor 14 is operated, and uses the heat of evaporation at this time to cool the air passing through the evaporator 7.

In this type, the control device for the compressor 14 has a normally open contact 18a of the air conditioner relay 18, a normally closed contact 19a of the relay 19, which will be described later, and the compressor 1, as shown in FIGS. 1 and 2.
4 electromagnetic clutch 14a and battery power supply 20
The coil 18b of the air conditioner relay 18 and the air conditioner switch 21 are connected in parallel to the series circuit, and the air conditioner operating knob 23 provided on the control board 22 of the instrument panel (not shown) is rotated. Then, the air conditioner switch 21 is turned on and the air conditioner relay 1 is turned on.
8 is closed, and in this state the normally closed contact 19 of the relay 19
If a is closed, the electromagnetic clutch 14a of the compressor 14 is energized and the compressor 14 is activated. Moreover, the above evaporator 7
has a temperature control means that makes the set temperature variable, and this temperature control means changes in conjunction with the thermistor 24 that detects the temperature of the air outlet from the evaporator 7 and the rotation of the air conditioner operating knob 23. A control circuit 26 connects a series circuit with a variable resistor 25 to
In this control circuit 26,
Sensor output from thermistor 24 and variable resistor 25
When the sensor output is lower than the reference setting temperature, an output signal is generated, and this output signal causes the relay 19 to
By energizing the coil 19b, the relay contact 19a is opened to cut off the power to the electromagnetic clutch 14a of the compressor 14, thereby stopping the operation of the compressor 14.

On the other hand, switching of the air intake door 1 is performed by operating an inside/outside air switching means, and the air intake door 1 is
It is connected to an air intake lever 27 provided on the control plate 22 via a wire or the like,
The air intake door 1 is fixed at an inside air circulation position or an outside air introduction position depending on the inside air circulation position REC. or the outside air introduction position FRESH of the air intake lever 27, respectively. In addition, in FIGS. 1 and 2, 28 is the operation switch of the blower 2, and 29 is the opening/closing door 11, 1.
An air outlet selection switch 2 and 13 performs opening/closing operations and selects each air outlet; 30 is a temp control switch that adjusts the opening degree of the air mix door 4 and controls the amount of air distributed to the heater core 3; and 31 controls the number of rotations of the blower 2. This is a resistance for adjustment.

However, in such a conventional vehicle air conditioner, a cooling unit C is installed in the internal air circulation passage 6 communicating with the air intake box I.
Because of the arrangement of the air intake lever 27, the air intake door 1 must be fixed in the internal air circulation position when operating the air conditioner.
and the operation unit for operating the air conditioner (rotary operation knob 23)
were established separately and independently, so sometimes,
There is a possibility that the air-conditioner operation unit may be operated with the air intake lever 27 set to the outside air introduction position FRESH due to an erroneous operation by the occupant. For this reason, even though the evaporator 7 in the cooling unit C is operating, a situation arises in which outside air that does not pass through the evaporator 7 is introduced into the passenger compartment, making it impossible to introduce cooling air into the passenger compartment. This will cause problems.

The present invention has been made in view of the above, and its object is to provide an air conditioner equipped with a cooling unit in an internal air circulation passage upstream of an air intake door that switches between internal air circulation and outside air introduction. In the device, the operation area of the air intake lever is composed of an inside/outside air switching area and an air conditioner area attached to the inside air circulation position side of the inside/outside air switching area, and when the air intake lever moves within the air conditioner area, By providing an air intake mechanism that keeps the air intake lever in the internal air circulation position, and by installing the above-mentioned control means in conjunction with the air intake lever in the air conditioner area, the air intake door is always kept in the internal air circulation position when the air conditioner is operated. An object of the present invention is to provide an air conditioner for a vehicle, which can be held in place, thereby preventing erroneous operation of an air intake lever, and thereby ensuring reliable operation of the air conditioner.

Hereinafter, the present invention will be described in detail based on embodiments shown in the accompanying drawings.

In the first embodiment shown in FIGS. 3 and 4,
The evaporator 7 during the cooling cycle is configured to operate by turning on the air conditioner switch 21, as in the past, but unlike the past, the air conditioner switch 21 is configured with a micro switch, and the air intake Lever 27
It is designed to turn on and off by operating the .

In this embodiment, the air intake lever 27 has its middle portion pivoted to a base plate (not shown), and an operation knob 32 attached to one end thereof projects above the control plate 22 and has a slit 33 extending in the left-right direction. It is designed so that it can be moved from side to side. The operation area of the air intake lever 27 includes an inside/outside air switching area A which has an inside air circulation position REC. and an outside air introduction position FRESH on both sides, and an inside air circulation position REC. side of this outside air switching area A. Air conditioner area B with air conditioner operating position A/C installed on one side.
It is made up of.

Further, the air intake lever 27 is provided with a missing swing mechanism 34, and this missing swing mechanism 34
includes a rotating piece 35 having one end pivotally attached to the base plate, a guide slit 36 formed in the rotating piece 35, and a guide slit 36 that projects from the tip of the air intake lever 27 and is slidable in the guide slit 36. It is composed of a guide pin 37 that engages with the guide pin 37. The guide slit 36 is composed of an arcuate portion 36a centered around the pivot 38 of the air intake lever 27, and a locking groove portion 36b integrally extending from one side of the arcuate portion 36a. When the air intake lever 27 is set to the internal air circulation position REC., the guide pin 37
are located at the boundary positions of each portion of the guide slit 36. Furthermore, a compression-resistant wire 39 is connected between the rotatable free end of the rotatable piece 35 and the air intake door 1, and the air intake door 1 is connected to the air intake door 1 depending on the position of the air intake lever 27. It is designed to be fixed at the circulation position or the outside air introduction position.

Further, a switch piece 40 that protrudes outward is provided at the middle part of the air intake lever 27, and this switch piece 40 is used to turn the air conditioner switch when the air intake lever 27 is set to the air conditioner operating position A/C. 21 is turned on.

Reference numeral 41 in FIG. 3 is a temperature adjustment switch that is provided on the control board 22 and makes the set temperature of the evaporator 7 variable. By operating this temperature adjustment switch 41, the variable resistor 25 shown in FIG. The low resistance value of is now changing in conjunction.

Therefore, according to the vehicle air conditioner according to this embodiment, when the air intake lever 27 is operated within the range of the inside/outside air switching area A, as shown in FIGS. 2
7 rotates around a pivot 38. At this time, the guide pin 37 is always engaged with the locking groove 36b of the guide slit 36, and the rotating piece 35 rotates in accordance with the movement stroke of the air intake lever 27. For this reason, the wire 39 connected to the rotating piece 35 moves with respect to its operating direction, and this wire 39
Air intake door 1
is activated. That is, when the air intake lever 27 is set to the outside air introduction position FRESH, the air intake door 1 is fixed at the outside air introduction position, and the air intake lever 27 is set to the inside air circulation position.
When set to REC., the air intake door 1 is fixed at the internal air circulation position.

Furthermore, when operating the air intake lever 27 within the range of the air conditioner region B from the inside air circulation position REC. 38 as the center point, and when it reaches the air conditioner operation position A/C, the air conditioner switch 21 is turned on by the switch piece 40, and the air conditioner is operated. At this time, the air intake lever 27 moves to the internal air circulation position REC.
The guide pin 3 rotates from the air conditioner operating position A/C to the air conditioner operating position A/C, but the guide pin
7 engages with the arcuate portion 36a of the guide slit 36, the guide pin 37 engages with the arcuate portion 36a of the guide slit 36.
6a, the rotating piece 35
is the internal air circulation position of the air intake lever 27
Maintain the state in REC. Therefore, even if the air intake lever 27 is operated within the air conditioner area B, the wire 39 will not move in the operating direction, and the air intake door 1 will remain fixed at the inside air circulation position. Therefore, move the air intake lever 27 to the air conditioner operating position A/
When set to C, the evaporator 7 operates with the air intake door 1 fixed at the inside air circulation position, and the air inside the vehicle passes through the evaporator 7 from the inside air circulation passage 6 and is cooled. After that, the air passes through or bypasses the heater core 3 and is led back into the vehicle interior, thereby ensuring temperature control within the vehicle interior.

Next, a second embodiment shown in FIGS. 5 and 6 will be described.

The basic configuration of the air conditioner in this embodiment is substantially the same as that in the first embodiment, but unlike the first embodiment, the air conditioner area B of the air intake lever 27 is located at the air conditioner operating position A/C. In addition, it has a temperature adjustment area B' that makes the set temperature of the evaporator 7 variable. The switch piece 40 of the air intake lever 27 is connected to the evaporator 7.
The control switch 42 includes a rod 45 connected to the switch piece 40 of the air intake lever 27.
a pair of fixed contacts 44a, 44, one of which is connected to the coil 18b of the air conditioner relay 18 and the other grounded.
The evaporator 7 includes an air conditioner switch 21 consisting of the evaporator 7 and a variable resistor 25 that makes the set temperature of the evaporator 7 variable. Then, when the air intake lever 27 is set to the air conditioner operating position A/C,
The air conditioner switch 21 is turned on when the movable contact piece 43 contacts both fixed contacts 44a and 44b. Therefore, when the air conditioner switch is turned on, the air conditioner relay 18 is turned on, and the current from the battery power supply 20 flows through the contacts 18a and 19a of the air conditioner relay 18, as shown in FIG. The voltage is supplied to the electromagnetic clutch 14a of the compressor 14, and the compressor 14 starts operating. As a result, the evaporator 7 begins to operate, and the temperature-controlled air that has passed through the evaporator 7 in the internal air circulation state is blown into the vehicle interior. Furthermore, when the air intake lever 27 is moved in the temperature adjustment area B', that is, in the range to the left from the air conditioner operating position A/C, the movable contact piece 43 moves as the air intake lever 27 moves. , at this time, the movable contact piece 43 is connected to the fixed contact 44a,
44b, the air conditioner switch 21 remains in the on state, and the air conditioner continues its operation. Further, the variable resistor 25 is configured such that its resistance value can be successively set to smaller values as the movable contact piece 43 moves leftward, and the air intake lever 27 is moved to the temperature adjustment area B'. When positioned at the leftmost MAX,
The resistance value of the variable resistor 25 is made to be zero. Therefore, the set temperature of the evaporator 7 is set according to the resistance value of the variable resistor 25, and the compressor 14 is controlled on and off by the control circuit 26 based on this set temperature. Therefore, according to this embodiment, unlike the first embodiment,
The temperature adjustment switch 41 is no longer required, which not only makes it possible to make the appearance of the control panel 22 more streamlined, but also allows the operations of operating the air conditioner and adjusting the set temperature of the evaporator 7 to be performed in one operation. This greatly simplifies air conditioner operation.

Note that the location where the air conditioner operating position A/C is provided is not limited to those shown in each of the above embodiments, but in short, it is sufficient to install it on the inside air circulation position REC. side, for example, at the air intake. The position where the lever 27 is pulled out and the position where the lever 27 is pushed in may be set as the air conditioner operating position. Also, regarding the above-mentioned air intake mechanism 34, the air intake lever 27
As long as the wire 39 is not moved in the operating direction in the air conditioner area B, the design may be changed as appropriate. Furthermore, the air intake lever 27 may be operated by a sliding type instead of a rotary type.

As explained above, according to the vehicle air conditioner according to the present invention, in the type in which the cooling unit is provided in the inside air circulation passage upstream of the air intake door that switches between inside air circulation and outside air introduction, the air intake lever The operation area is composed of an inside/outside air switching area and an air conditioner area attached to the inside air circulation position side of the inside/outside air switching area. In addition to providing an air intake mechanism that keeps the air intake lever in the air conditioner position, we also installed control means such as an air conditioner switch and a control switch to operate in conjunction with the air intake lever in the air conditioner area, so that the air intake lever is always in the internal air circulation position when the air conditioner is operated. This completely eliminates the conventional situation in which the air conditioner does not operate due to incorrect operation of the air intake lever, and allows the air conditioner to operate reliably.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an example of a conventional vehicle air conditioner, FIG. 2 is a circuit diagram thereof, and FIG. 3 is a schematic diagram showing a first embodiment of the vehicle air conditioner according to the present invention. FIG. 4 is an explanatory diagram showing the operating state of the air conditioning mechanism shown in FIG. 3, FIG. 5 is a schematic diagram showing a second embodiment of the vehicle air conditioner according to the present invention, and FIG. 6 is a circuit diagram thereof. . A...Internal and external air switching area, B...Air conditioner area,
I...Air intake box, C...Cooling unit, 1...Air intake door, 6...
Internal air circulation passage, 7... Evaporator, 18... Air conditioner relay, 21... Air conditioner switch (control means), 22... Control board, 25... Variable resistance, 27... Air intake lever, 34...
Missing mechanism, 40... switch piece, 42... control switch (control means).

Claims (1)

[Scope of Claims] 1. An evaporator disposed in an inside air circulation passage upstream of an air intake door that switches between inside air circulation and outside air introduction, a control means for operating the evaporator, and an air system that switches between inside air circulation and outside air introduction. In a vehicle air conditioner including an inside/outside air switching means formed by connecting an intake door to an air intake lever, the operating area of the air intake lever is located between the inside/outside air switching area and the inside air circulation position side of the inside/outside air switching area. The inside/outside air switching means is provided with an air swing mechanism that keeps the air intake lever in the inside air circulation position when the air intake lever moves within the air conditioner area, An air conditioner for a vehicle, characterized in that the above-mentioned control means is installed so as to be interlocked with a certain air intake lever. 2. The control means includes a switch element that operates the evaporator when the air intake lever is located in the air conditioner area, and a variable resistor that changes the set temperature of the evaporator depending on the position of the air intake lever in the air conditioner area. An air conditioner for a vehicle according to claim 1, characterized in that: