JP3075878B2 - Air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner provided with a detector for detecting clogging of a filter such as an oil or gas hot air heater and an air conditioner.

[0002]

2. Description of the Related Art Conventionally, clogging of a filter is generally based on the accumulated operation time of an air conditioner.

As a detector for detecting clogging of a filter, a detector using various sensors as disclosed in JP-B-62-48137 is known. In FIG. 3, 1 is an air conditioner main body, 2 is an intake port, 3 is a detachable filter, 4 is a heat exchanger, 5 is a blower, 6 is an outlet, and indoor air is blown from the intake port 2 by the blower 5. It is taken into the air conditioner main body 1 and is discharged into the room from the outlet 6 via the filter 3 and the heat exchanger 4. At this time, the indoor air is subjected to heat exchange by the heat exchanger 4 after dust and the like are attached to the filter 3. Reference numeral 7 denotes a photoelectric detector for detecting clogging of the filter 3, the details of which are shown in FIG.

[0004] That is, the photoelectric detector 7 is provided with a detection unit including a light emitting element 8 and a light receiving element 9 on both sides of the filter 3. Normally, the light of the light emitting element 8 passes through the filter 3 and reaches the light receiving element 9; however, if dust adheres to the filter 3, the light transmittance deteriorates, and the light receiving element 9 cannot receive light. The signal from the detector 7 is the lead line 1
The control signal is transmitted to a control device (not shown) in the air conditioner main body 1 through 0 and 10 to stop the operation or notify the clogging by a lamp, a buzzer or the like.

[0005]

However, the method based on the accumulated operation time has a problem that the filter is stained differently depending on the state of the room where the air conditioner is placed, and is inaccurate.

If the above-mentioned photoelectric detector, differential pressure sensor, hot thermistor, wind speed sensor or the like is used as a detector, an accurate value can be obtained, but it is very expensive. .

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned facts, and is inexpensive and accurately detects clogging of a filter, which is less affected by the state of a room in which an air conditioner is placed. The purpose is to be.

[0008]

According to the present invention, there is provided an air inlet and an air outlet, and a heat exchanger and a blower are provided in an air flow path connecting the air inlet and the air outlet. An air conditioner main body, which is controlled by a heater and sent out from an outlet, a filter detachably provided on the windward side of the heat exchanger, and a detector for detecting clogging of the filter. In the air conditioner, when the filter is clogged , a strain gauge having a through-hole for concentrating suction outside air is provided.
It is obtained by distribution.

[0009]

In an air conditioner provided with a heat exchanger and a blower in a blowing path connecting an intake port and an air outlet, the outside air sucked from the air inlet is temperature-controlled by the heat exchanger and sent out from the air outlet. The detector for detecting clogging of the filter has a through-hole for concentrating intake air when the filter is clogged.
Since configurations arranged strain gauges that, as when there is no clogging of the filter, the gauge Me distortion due out differential pressure and boundary filter is small, but the variation of the electrical resistance is small, the eyes of the filter is clogged, Since the amount of air passing through the through-hole increases, the strain in the strain gauge increases, and the change in electrical resistance also increases.If the change in electrical resistance due to strain in the strain gauge exceeds a certain value, the filter becomes clogged. Can be determined to have occurred.

Thus, a highly accurate detector can be provided which is not affected by the condition of the room where the air conditioner is placed. Further, since the strain gauge is very inexpensive as compared with a pressure sensor or the like, the manufacturing cost can be reduced.

[0011]

An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 denotes an air conditioner main body, 2 denotes an air inlet opening to the front of the air conditioner main body 1, 3 denotes a detachable filter, 4 denotes a heat exchanger, and the air inlet 2 and the heat exchanger 4
And the filter 3 is inserted between them. Also, 5
Is a blower, and 6 is an air outlet. Room air is taken into the air conditioner main body 1 from the air inlet 2 by the air blower 5, and discharged into the room from the air outlet 6 through the filter 3 and the heat exchanger 4. At this time, the indoor air is subjected to heat exchange by the heat exchanger 4 after dust and the like are attached to the filter 3. 1
1 is a detector for detecting clogging of the filter 3 (distortion gauge).
It is.

[0012] Figure 2 shows a detail of the detector 11. That is, the detector 11 includes a flexible film 12 using an organic film or the like and the flexible film 12.
The strain detecting electrode 13 and the lead wire 14 contained in the
The filter 14 detects the clogging of the filter 3 based on the deformation of the flexible film 12 due to a change in the pressure difference between the inside and outside of the filter 3. In other words, the strain detecting electrode 13 is deformed simultaneously with the deformation of the flexible film 12, and this deformation is changed into a change in electric resistance, and the signal is transmitted to the connection wires 15, 15.
The information is transmitted to a control device (not shown) in the air conditioner main body 1 by 14 to notify the stop of operation or the clogging state by a lamp, a buzzer, or the like.

The location for mounting such a detector 11 is as follows.
Any location can be used as long as a change in the pressure difference between the inside and outside of the filter 3 can be sensed.

The detector 11 is mounted on a portion of the flexible film 12 which does not interfere with the strain detecting electrode 13 by providing a through hole or the like having an appropriate size. was concentrated by thereby to deform the <br/> distortion detecting electrodes 13 increases,
The sensitivity of filter clogging can be further enhanced.

[0015]

Since the present invention is constructed as described above, it is possible to detect the clogging of the filter with high accuracy without being influenced by the state of the room where the air conditioner is placed. Also, the manufacturing cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an air conditioner showing one embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of a strain gauge.

FIG. 3 is a schematic configuration diagram of an air conditioner showing a conventional example.

FIG. 4 is a schematic configuration diagram of the photoelectric detector.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Air conditioner main body 2 Inlet 3 Filter 4 Heat exchanger 5 Blower 6 Outlet 11 Strain gauge (detector)

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Yoshimoto Fujimoto 2-18 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (56) References JP-A-3-236596 (JP, A) JP-A-61-101221 (JP, A) JP-B-62-48137 (JP, B2) (58) Fields investigated (Int. Cl. ⁷ , DB name) F24F 13/28 F24F 11/02

Claims (1)

(57) [Claims] 1. A heat exchanger and a blower are provided in an air blow path connecting the air inlet and the air outlet, and the outside air sucked from the air inlet is temperature-controlled by the heat exchanger and the air outlet is provided. An air conditioner comprising: an air conditioner body adapted to be sent from the air conditioner; a filter detachably provided on the windward side of the heat exchanger; and a detector for detecting clogging of the filter. An air conditioner comprising a strain gauge having a through-hole for concentrating the intake outside air when clogging occurs.