JP3525033B2 - Air conditioner with automatic ventilation function - 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 for cooling and heating the room, dehumidifying or humidifying the room, and more particularly to an air conditioner with an automatic ventilation function.

[0002]

2. Description of the Related Art Conventionally, an automatic ventilation function is installed in an indoor body 1 of an air conditioner as shown in FIGS. 5 and 6, and the indoor air in which the indoor body 1 is installed is in a clean state. An air conditioner with an automatic ventilation function is used. A blower fan 2 is provided in the indoor main body 1,
The air conditioner is formed together with a unit provided outside the room, and is used to blow out the air that has exchanged heat with the heat exchanger 3 that operates as an evaporator during cooling and as a condenser during heating from the inside of the indoor main body 1. The air-conditioned air blown from the indoor main body 1 by the blower fan 2 may be adjusted by the room temperature wind blown from the auxiliary blower fan 4. As shown in FIG. 7, the indoor main body 1 is covered with upper and lower covers 5 and 6, and a base 7 is housed inside.

An indoor main body 1 shown in FIGS. 5 and 6 has a blower fan 2 which rotates about a substantially horizontal axis.
An air ventilation system 8 is provided on one end side of the blower fan 2 in the axial direction. The air ventilation system 8 includes a ventilation fan 9 for exhausting air to the outside of the room and an air suction fan 10 for sucking indoor air into the indoor main body 1. A gas detection substrate 11 that detects whether or not to operate the air ventilation system 8 is attached to the base 7 using a holder 12.

FIG. 7 shows the structure of the gas detection substrate 11 and the holder 12 shown in FIG. On the gas detection substrate 11,
The gas detection sensor 13 and various electronic components 14 are mounted, and the holder 12 is provided with a vent hole 15. The ventilation holes 15 are
For example, it is provided as a small lattice window and has a small opening area. The gas detection sensor 13 detects fine particles such as smoke and dust in the air and generates an electric signal corresponding to the degree of air pollution. The output level corresponds to the degree of air pollution, and when the output level reaches a predetermined value, it is determined that the air is contaminated, and the air ventilation system 8 is operated. The air ventilation system 8 can operate in parallel when the air conditioner is performing normal air conditioning, and can also operate independently when not performing air conditioning.

FIG. 8 shows the structure of the air ventilation system 8 shown in FIG. In the air ventilation system 8, the rotor 16 containing an adsorbent such as zeolite rotates at a relatively low speed, such as several tens of times per hour, to adsorb and remove water from a passing air stream, or to dry air. It has the effect of adding moisture to the stream to absorb moisture. Indoor air is supplied to the rotor 16 by the air suction fan 10, and moisture-free air is discharged to the outside by the ventilation fan 9.

FIG. 9 shows the effect of using the auxiliary blower fan 4. As shown in FIG. 9 (a), the air-conditioned air 17 blown from the indoor main body 1 by the internal blower fan 2 is caused by the room temperature air 18 blown by the auxiliary blower fan 4 as shown in FIG. 9 (a). It is pulled up to or is held down as shown in FIG. 9 (b). By using the pulling-up effect as shown in FIG. 9A, it is possible to prevent cold air from accumulating on the floor surface during cooling, and to perform efficient cooling operation. In addition, as shown in FIG.
If the air-conditioned air 17 is suppressed by the room-temperature air 18, warm air can be sufficiently spread to the feet during heating operation, for example.

[0007]

In the gas detection sensor 13 as shown in FIG. 7, the error becomes large due to the flow of air other than the natural convection of the indoor air, making it difficult to accurately detect the gas. For this reason, the holder 12 is attached to the base 7 so as to surround the entire gas detection substrate 11 on which the gas detection sensor 13 is mounted, and a ventilation hole 15 such as a small lattice window is provided near the gas detection sensor 13 so that the chamber The influence of the air flow other than the natural convection of the air in the room where the inner body 1 is installed is avoided as much as possible.

However, in the method of mounting the gas detection substrate 11 using the holder 12 as described above, heat radiation from self-heating from the gas detection sensor 13 itself is insufficient. If the blower fan 2 stops, the flow of air in the indoor-side main body 1 of the air conditioner stops, so
Furthermore, the amount of heat radiation decreases, and the temperature of the air around the gas detection sensor 13 rises. In such a state, the gas detection sensor 13 is affected by the ambient temperature, and although the pollution level of the air is not so high, the output power level corresponding to the pollution level exceeds the predetermined value, and the "dirty" is detected. There is a possibility that it will be erroneously judged as "Yes".

An object of the present invention is to provide an air conditioner with an automatic ventilation function which can detect the degree of pollution of air accurately and perform effective ventilation.

[0010]

SUMMARY OF THE INVENTION According to the present invention, an indoor body is provided with gas detection means for detecting the degree of contamination of indoor air, and when the detection level of the gas detection means rises above a predetermined level, In an air conditioner with an automatic ventilation function that performs ventilation, the electrical wiring board on which the gas detection means is mounted and the electrical wiring board on the back side of the surface on which the gas detection means is mounted are An air conditioner with an automatic ventilation function, characterized in that it includes a holder for holding the air conditioner.

According to the present invention, the electric wiring board on which the gas detecting means is mounted is held by the holder so that the rear surface side of the surface on which the gas detecting means is mounted faces the air flow. Cooling can be performed without increasing the error, and the degree of air pollution can be accurately detected to perform efficient ventilation.

Further, the present invention is characterized in that the air flow is an air flow generated during an automatic ventilation isolated operation in which only ventilation is performed.

According to the present invention, during the air-conditioning operation, an air flow exists in the indoor main body due to, for example, operation of the blower fan, and the gas detecting means can be sufficiently cooled. During automatic ventilation alone operation, the gas detection means is cooled by the air flow generated when only ventilation is performed, so it is possible to detect dirt on the air accurately and perform efficient ventilation without being affected by the temperature rise. it can.

Further, the present invention is characterized by including an air suction fan for ventilation, and including control means for controlling the air flow to be generated by the air suction fan.

According to the present invention, the air suction fan is driven to cool the gas detecting means during the automatic ventilation isolated operation, so that the degree of pollution can be accurately detected and efficient ventilation can be performed.

The present invention further comprises, for the purpose of air conditioning, a fan for blowing air into the room, the air having undergone heat exchange with the heat medium supplied from the outdoor side, and the airflow is generated by driving the fan for blowing air. It is characterized in that it includes control means for controlling as described above.

According to the present invention, in the automatic ventilation independent operation, although the air conditioning blower fan is originally stopped, the blower fan is driven to generate an air flow in the indoor main body, and the gas detecting means is operated. Can be cooled for accurate detection of air pollution.

Further, according to the present invention, for air conditioning, a fan for blowing air into the room, which exchanges heat with a heat medium supplied from the outside of the room, and a flow of air blown into the room by the fan. An auxiliary blower fan is provided, and the air flow further includes control means for controlling the auxiliary blower fan so as to drive and generate the auxiliary blower fan.

According to the present invention, the auxiliary blower fan is not used during the independent operation of the automatic ventilation, but it is used for generating the air flow for cooling the gas detecting means in the main body of the room, and the fan is accurate. Efficient ventilation operation can be performed based on air pollution level detection.

The present invention further comprises a fan for blowing air into the room for air conditioning, the air having undergone heat exchange with a heat medium supplied from the outside of the room, and an air suction fan for ventilation. Can be generated by a fan for blowing air and a fan for sucking air, and further includes control means for controlling to drive the fan for sucking air when the fan for blowing air is stopped.

According to the present invention, the gas detection sensor can be cooled by the air flow generated by the blower fan or the air suction fan, and the degree of contamination can be accurately detected to perform efficient ventilation. You can

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a schematic structure of an embodiment of the present invention. FIG. 1A shows a mounted state of a gas detection sensor which is a gas detection means, and FIGS. 1B and 1C show a state in which the gas detection sensor is cooled by an air flow. As shown in FIG. 1A, the gas detection board 21, which is an electric wiring board, is a single-sided mounting board, and is held by a holder 22 from the back surface side, which is the solder surface. An electronic component 24, etc., which constitutes a circuit for processing an output signal from the gas detection sensor 23, is mounted on the surface side which is the component surface of the gas detection substrate 21. The holder 22 is provided with a relatively large vent hole 25, and holds the gas detection substrate 21 in a state where the solder side of the gas detection substrate 21 is easily exposed to air.

As shown in FIG. 1 (b), a blower fan 32 and a heat exchanger 3 are provided inside the indoor main body 31 of the air conditioner.
3, the air flow 34 that blows out into the room exchanges heat with the heat exchanger 33 by the blower fan 32, and is cooled or heated to perform cooling or heating. In the present embodiment, as the air flow 35 inside the indoor main body 31 for blowing the air flow 34 to the outside of the indoor main body 31, it also passes through the back surface side of the gas detection substrate 21 held by the holder 22. Leave. Internal air flow 35 by the blower fan 32
Is generated when the indoor body 31 is performing normal cooling or heating. When the automatic ventilation operation is being performed without performing cooling or heating, the fan 32 that is normally stopped is driven and generated. However, the outdoor unit of the air conditioner is stopped and the circulation of the refrigerant to the heat exchanger 33 is also stopped.

FIG. 1C shows a state in which the back side of the gas detection substrate 21 is cooled by using the internal air flow 39 by the air ventilation system 38 when the blower fan 32 is stopped. The air flow 39 inside is the air suction fan 4
It is generated by 0.

FIG. 2 shows a schematic configuration for control of the embodiment shown in FIG. The control device 50 including a microcomputer includes a temperature sensor 51 and an operation mode switch 5
2. The drive of the blower fan 32, the auxiliary blower fan 54, the ventilation fan 59, the air suction fan 40, and the like are controlled based on input signals from the gas detection sensor 23 and the like. Inputs to the operation mode switch 52 include designation of cooling or heating, designation of dehumidification or humidification, designation of temperature, or designation of automatic ventilation independent operation. In the normal ventilation operation, the air in the room is sucked in by the air suction fan 40, passes through the air ventilation system 38, and is then discharged to the outside by the ventilation fan 59.

FIG. 3 shows the program operation of the controller 50 of FIG. The operation is started from step a1, and in step a2, it is determined whether the operation mode is automatic ventilation independent operation or air conditioning operation such as cooling and heating. When it is determined that the automatic ventilation is the independent operation, the process proceeds to step a3 to drive the air suction fan 40. In step a4, it is determined according to the output level from the gas detection sensor 23 whether the pollution level has reached a predetermined level. When it is determined that the degree of pollution reaches a predetermined level and the air is contaminated, the air suction fan 40 is operated at step a5.
At the same time, the ventilation fan 59 is driven to perform ventilation operation. When it is determined in step a4 that the degree of pollution has not reached the predetermined level, or after step a5, it is determined in step a6 whether or not a stop instruction is given to the operation mode switch 52. If the stop instruction has not been given, the process returns to step a4, and steps a4 to a6 are repeated.

When it is determined in step a2 that the operation mode is cooling / heating, it is determined in step a7 whether the blower fan 32 is being driven. When it is determined that the fan is not being driven, the air suction fan 40 is driven in step a8. After step a8 or when it is determined in step a7 that the blower fan 32 is being driven, the process proceeds to step a9, and the contamination level is determined by the output level of the gas detection sensor 23. When it is determined that the pollution level is higher than the predetermined level, in step a10, the ventilation fan 59 is driven together with the air suction fan 40 to perform the ventilation operation. After step a10
Alternatively, when it is determined in step a9 that the contamination level has not reached the predetermined level, it is determined in step a11 whether or not a stop instruction has been given to the operation mode switch 52. When the stop instruction is not given, the process returns to step a7, and the processes from step a7 to step a11 are repeated. When it is determined in step a6 or step a11 that the stop instruction is given, the process ends in step a12.

FIG. 4 shows the operation of another embodiment of the present invention. In the present embodiment, parts corresponding to those of the embodiment of FIG. 1 are designated by the same reference numerals, and duplicated description will be omitted. In this embodiment, the solder surface side of the gas detection board 21 is cooled by using the air flow 55 inside the indoor body 31 formed by the auxiliary blower fan 54. The auxiliary blower fan 54 is
It is used for generating the air flow 55, although it is originally stopped during the automatic ventilation operation.

In a normal air conditioning operation, when the temperature or the like reaches a set state, the blower fan 32 stops. In this case, the air suction fan 40 may be driven to cool the solder surface side of the gas detection board 21 by the internal air flow 39. In this way, by radiating heat from the gas detection sensor 23 through the solder surface side of the gas detection substrate 21, it is possible to improve erroneous determination due to an increase in ambient temperature. When the gas detection board 21 is a double-sided mounting board,
If you cool the back side of the side where the gas detection sensor is mounted,
The same effect can be obtained.

[0030]

As described above, according to the present invention, in the electric wiring board on which the gas detecting means is mounted, the rear surface side facing the surface on which the gas detecting means is mounted is exposed to the air flow inside the indoor main body. Since it can be cooled, the degree of air pollution can be accurately detected and efficient ventilation can be performed. Since the air flow does not directly impinge on the gas detection means, it is possible to prevent the detection accuracy of the gas detection means from being impaired by the air flow for cooling.

Further, according to the present invention, the gas detection means can be cooled by the air flow inside the indoor main body even during the automatic ventilation independent operation, so that the degree of air pollution can be accurately detected and the efficient ventilation operation can be performed. It can be performed.

Further, according to the present invention, the gas detection sensor can be cooled by using the air suction fan.

Further, according to the present invention, the gas detection sensor can be cooled by using the fan for blowing which is not used in the automatic ventilation independent operation.

Further, according to the present invention, the gas detection sensor can be cooled by using the auxiliary blower fan which is not used in the automatic ventilation independent operation.

According to the invention, the gas detection sensor is
Since the gas is cooled by the air flow generated by the blower fan and the air suction fan, the gas detecting means can be sufficiently cooled by operating the other while one is stopped.

[Brief description of drawings]

FIG. 1 is a partial exploded perspective view and a perspective view of a main part showing a schematic configuration of an embodiment of the present invention.

FIG. 2 is a block diagram showing a schematic electrical configuration for control of the embodiment of FIG.

FIG. 3 is a flowchart showing a program operation procedure of the control device 50 of FIG.

FIG. 4 is a simplified perspective view showing the operation of another embodiment of the present invention.

FIG. 5 is a cross-sectional view of an indoor-side main body of a conventional air conditioner.

FIG. 6 is an exploded perspective view of a conventional air conditioner with an automatic ventilation function.

7 is an exploded perspective view of the gas detection substrate 11 and the holder 12 of FIG.

FIG. 8 is an exploded perspective view of the air ventilation system 8 of FIG.

9 is a simplified perspective view showing the operating principle of the auxiliary blower fan 4 provided in the indoor main body 1 of FIG.

[Explanation of symbols]

21 Gas detection board 22 Holder 23 Gas detection sensor 24 Electronic components 25 vents 31 Indoor side body 32 Blower fan 33 heat exchanger 34 Air flow Air flow inside 35, 39, 55 38 air ventilation system 40 Air suction fan 50 controller 52 Operation mode switch 54 Auxiliary blower fan 59 Ventilation fan

─────────────────────────────────────────────────── --- Continuation of the front page (56) Reference JP-A-6-34204 (JP, A) JP-A-4-214151 (JP, A) JP-A-9-159199 (JP, A) JP-A-62- 266335 (JP, A) Actual development Sho 59-161435 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) F24F 7/007 F24F 11/02 103

Claims (6)

(57) [Claims] 1. An indoor-side main body equipped with gas detection means for detecting the degree of contamination of indoor air, and performing ventilation when the detection level of the gas detection means rises above a predetermined level. In the harmony device, an electric wiring board on which the gas detection means is mounted, and a holder that holds the electric wiring board so that the back surface side of the side on which the gas detection means is mounted faces the air flow inside the indoor main body. An air conditioner with an automatic ventilation function, which includes: 2. The air conditioner with an automatic ventilation function according to claim 1, wherein the air flow is an air flow generated during an independent operation of automatic ventilation in which only ventilation is performed. 3. An air suction fan for ventilation, comprising control means for controlling the air flow to be generated by the air suction fan.
Air conditioner with automatic ventilation function described. 4. For air conditioning, there is provided a fan for blowing air into the room, the air having undergone heat exchange with a heat medium supplied from the outdoor side, and the air flow is controlled so as to be generated by driving the fan for blowing. The air conditioner with an automatic ventilation function according to claim 2, further comprising: 5. For air conditioning, a fan for blowing air into the room that exchanges heat with a heat medium supplied from the outside of the room, and an auxiliary fan for adjusting the flow of air sent into the room by the fan for blowing air. The air conditioner with an automatic ventilation function according to claim 2, further comprising: a fan, wherein the air flow further includes a control unit configured to drive and generate an auxiliary blower fan. 6. For air conditioning, a fan for blowing air into the room, which exchanges heat with a heat medium supplied from the outside of the room, and a fan for sucking air, are provided. 2. The automatic ventilation according to claim 1, further comprising control means that can be generated by the air intake fan and the air intake fan, and that controls to drive the air intake fan when the blower fan is stopped. Air conditioner with function.