JPH031281Y2 - - 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 which is provided with an inside air and outside air intake system that sucks outside air through a filter, and the drive circuit of the air conditioner is as shown in FIG. It is formed by connecting the blower 10, resistors 11a and 11b for adjusting the air volume of the blower 10, and an air volume switching switch 12 of the blower 10 in series, and the air volume switching switch 12 is connected by bypassing the resistors 11a and 11b. The switching contact 12a for the "strong" operation mode is connected to the switching contact 12a for the "medium" operation mode, which is connected by bypassing the resistor 11b.
2b, a "weak" operation mode switching contact 12c connected via the resistors 11a and 11b, a common contact 12d, and a switching terminal 12e.

(Problems to be Solved by the Invention) In the conventional vehicle air conditioner, the drive circuit for the blower 10 operates even when the filter installed in the outside air intake system is removed for cleaning. If the vehicle is operated on "strong" mode, not only will outside air containing dust and other substances mix into the interior of the vehicle, making it impossible to maintain cleanliness, but also dust and other particles will accumulate inside the air conditioner, causing problems with the device. There was a problem.

(Purpose of the invention) In view of the above-mentioned conventional problems, the object of the present invention is to provide an air conditioner for a vehicle that can operate an outside air intake system that prevents outside air containing dust etc. from entering the car interior when the filter is removed. .

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a vehicle equipped with an inside air and outside air intake system that sucks outside air through a filter in at least a "strong" or "weak" driving mode. The air conditioner is characterized in that it includes a detection means for detecting attachment and detachment of the filter, and a control means for preventing the "strong" operation of the inside air and outside air intake systems when the filter is removed.

(Function) According to the present invention, a detection means for detecting the attachment and detachment of the filter is provided, and a control means is provided to prevent the "strong" operation of the inside air and outside air intake systems when the filter is removed, so that cleaning etc. When the filter is removed, it is detected by the detection means, and the control means controls the air conditioner to prevent the "high" operation of the inside air and outside air intake systems based on the signal from the detection means.

(Example) Figures 1 and 3 show an example of the present invention,
Components that are the same as those of the conventional example are indicated 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. 4 is a detection means for detecting attachment/detachment of the filter 1, such as a micro switch; when the filter 1 is attached,
The filter 1 is the lever 4a of the micro switch.
contact 4b of the micro switch 4, which will be described later.
On the other hand, when the filter 1 is removed, the filter 1 separates from the lever 4a of the microswitch, so the lever 4a of the microswitch turns on the contact 4b described later by the spring biasing force of the coil spring 4c. It is set up to do so.

FIG. 3 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 bypasses the resistors 11a and 11b and is a relay. 13 normally closed switching contact 13a and switching terminal 13
The switching contact 12a for the "strong" operation mode is connected via the resistor 11b, and the switching contact 12b for the "medium" operating mode is connected via the resistor 11b. ta “weak”
It is formed from a switching contact including an operation mode switching contact 12c, a common contact 12d, and a switching terminal 12e. Reference numeral 14 designates a micro switch for turning on and off the blower 10, which is connected in series to a power source (not shown) to form a drive circuit for the blower 10.

Also, the normally open switching contact 13b of the relay 13 has a resistor 1.
5 to the "strong" switching contact 12a. Reference numeral 16a denotes a normally open relay contact of the relay 16, which is connected to the switching contact 13b and via a light emitting diode 17 to the common contact 12d. In addition, a contact 4 of a micro switch 4 that detects attachment/detachment of the filter 1
b, the coil 13d of the relay 13, and the coil 16b of the relay 16 are the blower 10, the resistors 11a and 11b, the changeover switch 12, and the microswitch 1.
It is connected in parallel to the series circuit with 4.

According to this embodiment, when the filter 1 is attached, the filter 1 is in pressure contact with the lever 4a of the microswitch, and the lever 4a is separated from the microswitch 4, so that the contact 4b of the microswitch 4 is It turns off. Therefore, when the blower 10 is turned on, the blower 10 is set to "strong", "medium", or "low" depending on the selection of the changeover switch 12.
The inside air and outside air intake systems can be operated in each operation mode. Next, when the filter 1 is removed, the filter 1 is separated from the lever 4a of the microswitch, and the contact 4b of the microswitch 4 is turned on by the spring biasing force of the lever 4a. Therefore, the relay coils 13b and 1
6b are excited because current flows through them, and the switching terminal 13c of the relay 13 comes into contact with the normally open switching contact 13b, while the normally open relay contact 16a of the relay 16 is turned on. Therefore, when the blower 10 is turned on, the blower 10 can operate the inside air and outside air intake systems in the "medium" and "low" operation modes depending on the selection of the changeover switch 12, but when the changeover terminal 12e is Even if it comes into contact with the switching contact 12a in the "strong" operating mode, the internal air and outside air intake systems will not operate in the "strong" operating mode because the resistor 15 is interposed. Also, the light emitting diode 17 is energized, and the light emitting diode 17 indicates that the filter 1 is removed.

Furthermore, according to this embodiment, when the filter 1 is removed, the outside air intake system cannot be operated in a "strong" mode, making it difficult for dust, etc. contained in the outside air to flow into the passenger compartment, and at the same time, the "weak" operation of the outside air intake system is disabled. ” or “inside” allows the function of guiding fresh outside air into the vehicle interior to be maintained.

(Effects of the invention) As explained above, the present invention provides a vehicle air conditioner equipped with an inside air and outside air intake system that sucks outside air through a filter in at least a "strong" or "weak" operation mode. A detection means for detecting attachment and detachment of the filter is provided, and a control means is provided for preventing the "strong" operation of the inside air and outside air intake systems when the filter is removed, so that when the filter is removed for cleaning etc. The control means controls the inside air and outside air intake systems to prevent "strong" operation based on the signal from the sensing means. Therefore, it is difficult for dust, etc. contained in the outside air to flow into the cabin, and the cleanliness of the cabin can be maintained, and fresh outside air can be brought into the cabin by operating the outside air intake system in "weak" or "medium" mode. It has the effect of being able to guide people. Further, since dust and the like contained in the outside air are less likely to stay inside the air conditioner, there is an effect that the air conditioner is less likely to malfunction.

[Brief explanation of the drawing]

1 and 3 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 a conventional example of the vehicle air conditioner. Control circuit diagram of the conditioner. FIG. 3 is a control circuit diagram of the vehicle air conditioner according to the present invention. In the figure, 1...filter, 2...mounted object, 3...
...Outside air intake port, 4...Filter attachment/detachment detection means (micro switch), 10...Blower, 11a,
11b... Resistor for adjusting blower air volume, 12... Air volume selection switch, 13, 16... Relay, 14...
...Micro switch, 15...Resistor, 17...Light emitting diode.

Claims (1)

[Scope of utility model registration request] In a vehicle air conditioner provided with an inside air and outside air intake system that sucks outside air through a filter in at least a "strong" or "weak" operation mode, a detection means for detecting attachment/detachment of the filter is provided, An air conditioning device for a vehicle, comprising a control means for preventing the inside air and outside air intake systems from being operated in "high" mode when the air conditioning system is removed.