JPH0126493Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an air conditioner installed in a work vehicle or the like.

(Prior Art) Conventionally, a vehicle air conditioner is known that is provided with an outside air intake system and an inside air intake system that suck outside air through a filter, and the drive circuit of the air conditioner is shown in FIG. , the blower 10, resistors 11a and 11b for adjusting the air flow rate of the blower, and the air volume changeover switch 12 of the blower 10 are connected in series.
"High" switching contact 1 branched from the upstream of
2a and the "middle" switching contact 12b branched from and connected between the resistors 11a and 11b and the resistor 1.
It consisted of a switching contact consisting of a "low" switching contact 12c connected downstream of 1b, a common contact 12d, and a common terminal 12e.

(Problems to be Solved by the Invention) In the conventional vehicle air conditioner, the drive circuit of the blower 10 operates even when the filter installed in the outside air intake system is removed for cleaning. If the outside air intake system is operated with the air conditioner removed, outside air containing dust and other substances will be mixed into the vehicle interior, making it impossible to maintain cleanliness, as well as dust and other particles remaining inside the air conditioner, causing malfunctions. There was a problem in that it caused

(Purpose of the invention) In view of the above-mentioned conventional problems, an object of the present invention is to provide an air conditioner for a vehicle that prevents outside air containing sand and dust from being mixed into the interior of the vehicle when the filter is removed.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention provides an air conditioner for a vehicle that is provided with an outside air intake system and an inside air intake system that suck outside air through a filter, in which the filter can be attached and removed. and a detection means for detecting switching between the outside air intake system and the inside air intake system, and a control means for preventing operation by the outside air intake system when the filter is removed. .

(Function) According to the present invention, a detection means for detecting attachment/detachment of a filter and a detection means for detecting switching between an outside air intake system and an inside air intake system are provided, and when the filter is removed, operation by the outside air intake system is stopped. Since the filter is equipped with a control means for blocking, when the filter is removed for cleaning or the like, it is detected by the detection means, and the control means controls the air conditioner to prevent operation by the outside air intake system based on a signal from the detection means.

(Embodiment) FIGS. 1, 2, and 4 show an embodiment of the present invention, and the same components as those of the conventional example are denoted by the same reference numerals. That is, 1 is a filter attached to an outside air intake port 3 provided on an attached body 2. Reference numeral 4 indicates means for detecting attachment/detachment of the filter 1, such as a microswitch, such that when the filter 1 is attached, the filter 1 presses against the lever 4a of the microswitch 4, turning on the contact 4b of the microswitch 4. It is provided.

Reference numeral 5 denotes an operating lever for an internal/external air switching damper (not shown), which is rotatable about a shaft 5a provided in the middle. 6 is a detection means for switching between the outside air intake system and the inside air intake system, such as a micro switch;
When the operation lever 5 is in the inside air intake system position, its tip 5b is connected to the lever 6 of the micro switch 6.
a is pressed to turn on the micro switch 6.

FIG. 4 is a control circuit diagram of the present invention, in which 10 is a blower, 11a and 11b are resistors for adjusting the air volume of the blower 10, and 12 is an air volume changeover switch for the blower 10, which can be switched as described in the prior art. Contact 12
a, 12b, 12c, a common contact 12d, and a common terminal 12e. Further, 13a is a normally open relay contact of the relay 13, and these are connected in series to form a drive circuit for the blower 10.
Further, the contact 4b of the micro switch 4 for detecting attachment/detachment of the filter 1 and the contact 6b of the micro switch 6 for detecting switching of the internal/external air suction system are connected in parallel, and are connected in series with the relay 13 and connected to the blower 10. It is connected to the common contact 12d of the air volume changeover switch 12, bypassing the relay contact 13a and the resistor 11 for adjusting the air volume of the blower. 14 is a light emitting diode that indicates that the operating lever 5 is in the outside air intake system position, and one end is connected to the contact 6 of the micro switch 6 for detecting switching of the inside air intake system.
The other end is connected to the common contact 12d of the air volume changeover switch 12 of the blower 10.

According to this embodiment, when the filter 1 is attached, the filter 1 presses against the lever 4a of the micro switch 4, so the contact 4b is turned on, and the air volume selection switch 1 of the blower 10 is turned on.
When the common terminal 12e of the two terminals is moved to establish conduction between the common contact 12d and one of the switching contacts 12a, 12b, and 12c, a current flows through the drive circuit, so that the relay 13 is energized and the relay contact 13a is turned on.
Therefore, the blower drive circuit operates regardless of the inside air intake system or the outside air intake system.

Next, when the filter 1 is removed, the contact 4b is turned on, but if the operating lever 5 is in the inside air intake system position, the lever 5 presses against the lever 6a of the micro switch 6, so the contact 6b becomes the A contact. They come into contact. For this reason, the relay 13 is energized and the relay contact 13a is turned on, so the blower drive circuit is activated. However, when the operating lever 5 is in the outside air intake system position, the micro switch 6 is turned off, so the contact 6b is turned on. It comes into contact with the contact point. Therefore, the relay 13 is in a de-energized state and the relay contact 13a is turned off, so the drive circuit is not activated and the light emitting diode 14 indicates that it is an outside air intake system.

Furthermore, according to this embodiment, since the blower 10 cannot be operated in the outside air intake system when the filter 1 is removed, outside air containing dust and the like does not enter the inside of the car, so the air inside the car remains clean. I can do it.

(Effects of the Invention) As explained above, the present invention provides a detection means for detecting attachment/detachment of the filter in a vehicle air conditioner equipped with an outside air intake system and an inside air intake system that suck outside air through a filter. , a detection means for detecting switching between the outside air intake system and the inside air intake system is provided, and a control means is provided to prevent operation by the outside air intake system when the filter is removed, so that the filter can be removed for cleaning etc. The detection means detects this, and the control means uses a signal from the detection means to perform control to prevent operation by the outside air intake system. Therefore, the cleanliness of the interior of the vehicle can be maintained because dust and the like contained in the outside air do not flow into the interior of the vehicle, and there is also the effect that there is no possibility of dust or the like accumulating inside the air conditioner, making it less likely to cause malfunctions.

[Brief explanation of the drawing]

1, 2, and 4 show an embodiment of the present invention. FIG. 1 is an explanatory diagram showing the attachment/detachment state of the filter of the vehicle air conditioner of the present invention, and FIG. 2 is an explanatory diagram of the present invention. FIG. 3 is an explanatory diagram showing the operation of the operating lever of the inside/outside air switching damper of the vehicle air conditioner. FIG. 3 is a control circuit diagram of a conventional vehicle air conditioner, and FIG. 4 is a control circuit diagram of a vehicle air conditioner according to the present invention. In the figure, 10... Filter, 2... Mounted object, 3
...Outside air intake port, 4...Filter attachment/detaching detection means (micro switch), 5...Inside/outside air switching damper operating lever, 6...Means for detecting switching between the outside air intake system and the inside air intake system (micro switch) , 10
...Blower, 11...Resistance for adjusting blower air volume,
12...Air volume selection switch, 13...Relay, 1
4... Light emitting diode.

Claims (1)

[Scope of utility model registration request] In a vehicle air conditioner equipped with an outside air intake system and an inside air intake system that suck outside air through a filter, a detection means for detecting attachment/detachment of the filter and a detection means for detecting switching between the outside air intake system and the inside air intake system. 1. A vehicle air conditioner, comprising: a detection means; and a control means for inhibiting operation by the outside air intake system when the filter is removed.