JP2005233484A - Air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air conditioner capable of measuring the concentration of carbon dioxide with high accuracy even when the air is moved, to correctly grasp ventilation timing. <P>SOLUTION: Output voltages Vo30 of a gas sensor 20 respectively at times when the indoor air is not blown out at all from a blowout port 4A, and when blowout speed levels of the indoor air are set to high (H), medium (M) and low (L) by a remote controller, correction values to the output voltages Vo30 respectively measured at the wind speed levels of high, medium and low are determined in advance to be Δ1, Δ2 and Δ3, the collection value Δi corresponding to the wind speed level in measuring is added to the output voltage Vo30 of the gas sensor by a controller of an electric equipment part 10, the concentration of carbon dioxide N_(ppm) in air is determined on the basis of the value, and any one of a ventilation indoor fan 12 and a ventilation outdoor fan 15 is operated on the basis of its result to perform the ventilation or to stop the ventilating operation. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an air conditioner that can ventilate when the concentration of carbon dioxide in indoor air exceeds a predetermined concentration.

  The outdoor unit installed outdoors and the indoor unit installed on the indoor wall are connected by a refrigerant pipe, and the indoor air in which the indoor unit is installed is sucked into the indoor unit by the fan inside the indoor unit. 2. Description of the Related Art Separable air conditioners are widely used in which cold air or warm air generated by heat exchange in a heat exchanger is returned to the room to maintain the room in a comfortable temperature environment.

  However, in a conventional general air conditioner, ventilation that impairs the cooling / heating effect is not considered, and ventilation equipment is not provided. Therefore, when the air conditioning operation by such an air conditioner is performed for a long time, since the indoor air is contaminated indoor air is discharged by opening the like regularly window, it is necessary to ventilation incorporate fresh outside air.

Therefore, for example, it consists of a carbon dioxide concentration sensor module, an air conditioning control module, and an air conditioning mechanism, and the air conditioning control module is that the carbon dioxide concentration measured by the carbon dioxide concentration sensor module has reached a maximum value not less than a predetermined value. When it was judged, the air conditioning mechanism was driven and fresh outside air was taken into the sealed space to lower the carbon dioxide concentration, and it was judged that the carbon dioxide concentration measured by the carbon dioxide concentration sensor module had reached a minimum value below a predetermined value. Sometimes, an air conditioner (see, for example, Patent Document 1) including an air quality adjusting device that finishes taking outside air into a sealed space has been proposed.
JP 2003-42493 A

  However, the apparatus for measuring the carbon dioxide concentration in air proposed in Patent Document 1 cannot be used to accurately measure the concentration of carbon dioxide when applied to an air conditioner that forcibly moves air. There was a problem. Therefore, as the timing of the ventilation in the air conditioner can be accurately grasped, it is necessary to ensure that the carbon dioxide concentration even movement of the air can be measured with high precision, it has been a problem to be solved .

  Since the present invention is to solve the problems of the prior art, the air conditioner having a gas sensor for measuring the concentration of carbon dioxide in the air to the indoor unit, the carbon dioxide concentration of the gas sensor was measured in the heat exchanger of the indoor unit The main feature is that it includes a controller that corrects based on the wind speed of the indoor air that exchanges heat with the refrigerant and outputs a control signal based on the corrected carbon dioxide concentration.

  According to the present invention, since the concentration of carbon dioxide contained in room air can be grasped with high accuracy, the ventilation means can be activated and the room can be ventilated at an optimal timing.

  The gas sensor is corrected based on the wind speed of the indoor air controller the carbon dioxide concentration in the room air measured to refrigerant heat exchange in the heat exchanger of the indoor unit, the controller is output based on the carbon dioxide concentration after correction An air conditioner that controls the operation of a ventilation means that is capable of at least either discharging indoor air to the outside or taking in outdoor air into the room by a control signal.

  An embodiment of the present invention will be described with reference to FIGS. Separate type air conditioner of the present invention is an outdoor unit that is installed outdoors (not shown), the outdoor unit and are connected by a refrigerant pipe 18 wall-mounted indoor unit installed in a room wall (hereinafter, (Abbreviated as “indoor unit”) 1, and the refrigerant is circulated between the outdoor unit and the indoor unit 1.

  The indoor unit 1 includes a main body case 4 including a rear case 2 on the back side, and a front case 3 provided with a front air inlet 3A on the front and top surfaces and detachably provided on the front side of the rear case 2. An air outlet 4A is provided on the lower side of the main body case 4, and a heat exchanger 5 for heating / cooling indoor air is installed in the main body case 4.

  The heat exchanger 5 functions as a cooler during the cooling / dehumidifying operation by exchanging heat with air outside the pipe when the refrigerant passes through the inside of the heat transfer pipe 6 that is meandering through the heat dissipating fins. However, it functions as a heater during heating operation.

  In addition, a blower fan 7 is provided inside the main body case 4 so as to be surrounded by the heat exchanger 5, and the air inside the room is sucked in from the front and upper suction ports 3 </ b> A of the front case 3 by the blower fan 7. The heat exchanger 5 exchanges heat with the refrigerant flowing in the heat transfer tube 6 to be heated / cooled, and the air is cooled / warmed from the outlet 4A of the main body case 4 and circulated.

  Further, on the lower side of the heat exchanger 5, a drain pan 8 for discharging accumulated drain water is added dropwise condensation in the heat exchanger 5 is provided, on the between the front case 3 and the heat exchanger 5 air filter 9 (not shown in FIG. 1) is provided in the main body casing 4 under the outlet 4A with direction changing device 14 is provided, the direction of the air to be blown is configured to be freely set.

  Further, operation of the compressor provided in the outdoor unit, not shown, is the electrical equipment section 10 for controlling the operation of the fan motor (not shown) for driving the blower fan 7, and divides the one side portion of the main body case 4 internal Has been.

  12 is a ventilation indoor fan for ventilating the room where the indoor unit 1 by exhausting the room air to the outdoor (outdoor) is installed, is installed in front of the heat exchanger 5. Specifically, the heat exchanger 5 is mounted on the front surface of the heat exchanger 5 so as to be detachably mounted on a resin-made grid-like pedestal 11 having a thermal conductivity much smaller than that of a metal such as aluminum or iron. .

  The ventilation outdoor fan 15 connected to the ventilation indoor fan 12 via the ventilation pipe 19 is installed outside the room. Specifically, the outdoor fan 15 for ventilation is installed in the outer surface of the outer wall (not shown) of the house where the indoor unit 1 is attached. For example, the blower outlet 15B of the ventilation outdoor fan 15 is connected to one end of the ventilation pipe 19, and the ventilation outdoor fan 15 is suspended.

  As the ventilation indoor fan 12 and the ventilation outdoor fan 15, a structure in which a motor and a sirocco fan are housed in a thin cylindrical fan case having a small thickness can be used. Since the fan with this structure can be made thin, it can be easily housed in the indoor unit 1 that is required to be downsized, and it is not conspicuous when it is provided outdoors, so that it is preferable in terms of aesthetics. it can.

  And since the blower outlet 12B of the indoor fan 12 for ventilation and the blower outlet 15B of the outdoor fan 15 for ventilation are connected by the ventilation pipe 19, the indoor unit 1 is installed when the indoor fan 12 for ventilation is started. The indoor air is sucked in from a circular suction port 12A opened on one side of the fan case of the ventilation indoor fan 12, and enters the ventilation outdoor fan 15 from the blowout port 12B through the ventilation pipe 19, from the blowout port 15B. It blows out from the circular inlet 15A opened on one side of the fan case. Therefore, by operating the indoor fan 12 for ventilation, the dirty air in the room in which the indoor unit 1 is installed can be discharged to the outside and the room can be ventilated.

  On the other hand, when the outdoor fan 15 for ventilation installed outdoors is started, outdoor air is sucked in from the inlet 15A of the outdoor fan 15 for ventilation, and is sent to the indoor fan 12 for ventilation via the ventilation pipe 19 from the blower outlet 15B. enters the air outlet 12B, and blown from the suction port 12A to the inside of the indoor unit 1, the blower fan 7 on the side of the heat exchanger 5 is sucked together with room air, if in operation, the heat transfer tube 6 in the heat exchanger 5 Heat is exchanged with the flowing refrigerant to be heated / cooled and blown into the room together with the room air from the lower outlet 4A. Therefore, by operating the outdoor fan 15 for ventilation, fresh indoor air can be taken into the room where the indoor unit 1 is installed to ventilate the room.

  That is, it is possible to ventilate the room in which the indoor unit 1 is installed by operating either the ventilation indoor fan 12 or the ventilation outdoor fan 15.

  The indoor unit 1 is provided with a gas sensor 20 for measuring the carbon dioxide concentration in the air. The gas sensor 20 is sucked from the front case 3 of the suction port 3A to the inside of the indoor unit 1 by the operation of the blower fan 7, the concentration of carbon dioxide contained in the indoor air flowing toward the heat exchanger 5 can be measured As described above, the lattice-shaped base 11 is mounted on the side away from the indoor fan 12 for ventilation.

  The gas sensor 20, the gas sensing portion 26 is disposed in a central portion of, for example, stainless steel wire mesh 21 as shown in FIG. 3, the zeolite 22, filter cap 25 which nonwoven 23 is placed on the upper opening 24 side as a filter In the process from the upper opening 24 to the gas sensing unit 26, a gas sensor formed so that dust, foreign matters such as CO and alcohol are filtered and adsorbed by the metal mesh 21, the zeolite 22, and the nonwoven fabric 23 is used.

  In addition, as the gas detection part 26, what was produced by mounting a sodium ion conductor (NASICON) on the board | substrate with which the ruthenium oxide heater was printed previously is used. Then, the gas sensing unit 26 is held a predetermined temperature, for example 400 ° C. by the heater 27 to the heater voltage Vh29 of the example given 5V as shown in FIG. 4 generates heat is applied, gas sensing portion of the high-temperature the variation of the electromotive force generated between the electrodes b-c by the electrochemical reactions occurring carbon dioxide in contact with the electrode 26, measured by amplifying the output voltage Vo30 through the amplifier 28, the carbon dioxide in the air Is to detect the concentration of.

  Therefore, the gas sensor 20, although during the measurement it is necessary to gas sensing portion 26 is heated and kept at all times a predetermined temperature, the air conditioner of the present invention the gas sensor 20 is installed in front of the heat exchanger 5 Therefore, the temperature decreases due to the influence of the indoor air sucked into the indoor unit 1 from the suction port 3 </ b> A of the front case 3 by the operation of the blower fan 7.

  That is, the gas sensor 20, for example, in the -10 to 50 ° C. Certification environment energizes heating of the heater 27 by applying a heater voltage Vh of the predetermined 5V to the heater 27, the gas sensing unit 26 to a predetermined 400 ° C. Become. However, the wind blows in this state, be blown about 30 ° C. air, the temperature of the gas sensing portion 26 drops rapidly, it is impossible to accurately measure the concentration of carbon dioxide in the air.

  Therefore, when the carbon dioxide concentration in the room air is variously changed and no room air is blown out from the outlet 4A on the lower side of the body case 4, the blowout speed level of the room air is large (H), medium (M ) measures the output voltage Vo30 when set by etc. the remote small (L), the wind speed level University (H), medium (M), the correction value for the output voltage Vo30 measured at small (L) determined in advance, respectively .DELTA.1, Delta] 2, and [Delta] 3, in the control device (not shown) is incorporated in the electrical component section 10, a correction value Δi which corresponds to the wind speed level during the measurement the output voltage Vo30 of the gas sensor 20 was added, the value calculated carbon dioxide concentration N (ppm) in the air on the basis of the outputs the required control signals from the controller when the value is for example higher than 1500 ppm (variable), ventilation indoor fan 12, the ventilation Any of the outdoor fan 15, or by driving both ventilation fans alternately, and is configured to perform ventilation of the room in which the indoor unit 1 is installed.

  Then, the correction value Δi which corresponds to the wind speed level during the measurement the output voltage Vo30 of the gas sensor 20 during ventilation operation by adding carbon dioxide concentration N in the air determined by calculation based on the value (ppm), for example, when it becomes less than 1000 ppm (variable) is configured to output a required control signal from the controller to stop the ventilation indoor fan 12 or ventilating outdoor fan 15 in operation stop ventilation .

  Therefore, in the air conditioner of the present invention, the blower fan 7 and heated / cooled by the heat exchanger 5 draws in room air from the front case 3 of the suction port 3A, the cool air / warm air from the lower side of the air outlet 4A even during the air conditioning operation to be blown, it is possible to accurately measure the carbon dioxide concentration N in the air, good timing ventilation indoor fan 12, and operated one of the ventilation outdoor fan 15, the indoor unit 1 is installed The room can be ventilated.

  The outdoor refrigerant pipe 18 is covered and protected by a refrigerant pipe cover 16 formed in a rectangular box shape. The refrigerant outdoor cover 15 is also accommodated in the refrigerant pipe cover 16 by using the refrigerant pipe cover 16.

  In addition, a slit structure or a filter structure suction port 16A corresponding to the suction port 15A of the ventilation outdoor fan 15 is formed on the front surface of the refrigerant tube cover 16, so that a large amount of foreign matter such as dust is not sucked in. I have a role.

  As a result, the ventilation outdoor fan 15 is protected from wind and rain and dust, and is not damaged by mischief, and the ventilation outdoor fan 15 is hidden by the refrigerant tube cover 16 so that it is not exposed. It becomes.

  In addition, since this invention is not limited to the said embodiment, various deformation | transformation implementation is possible in the range which does not deviate from the meaning as described in a claim.

  For example, in order to ensure also fluctuation of the heater voltage Vh29 applied to the heater 27, to measure the heater voltage Vh29 being applied to the heater 27 by installing a voltmeter, correcting the output voltage Vo30 based on the measurement voltage It is also possible to configure a controller built in the electrical component 10 so as to obtain the carbon dioxide concentration N in the air based on the corrected output voltage.

  Furthermore, for the carbon dioxide concentration N in the air measured by the gas sensor 20, the correction in the controller are built into the electrical equipment section 10 is not carried out on the basis of the wind speed level set by the remote controller, closer to the gas sensor 20 A wind speed sensor may be provided and the correction may be made based on the actual wind speed value measured by the wind speed sensor.

  The control unit with a built in electrical equipment section 10 is corrected by measuring the carbon dioxide concentration N in the air by the gas sensor 20, a predetermined concentration made it a digital representation on the remote control or the indoor unit 1, or require ventilation the provided to an alarm display when it exceeds, who viewed the display operates the remote controller properly ventilating the indoor fan 12, either the ventilation outdoor fan 15, or both ventilation fan It is also possible to operate alternately to ventilate the room where the indoor unit 1 is installed.

  Further, instead of providing the ventilation indoor fan 12 and the ventilating outdoor fan 15, to the one ventilation fan capable of switching of forward / reverse may be provided in the ventilation tube 19, exhaust the room air It is also possible to separately provide an exhaust pipe for exhausting air and an air supply pipe for taking outdoor air into the room to enable ventilation to perform exhaust and air supply at the same time.

  Further, as shown in phantom in FIG. 1, it provided the ultraviolet irradiation unit 13 equipped with an ultraviolet lamp capable of emitting ultraviolet light is close to the ventilation indoor fan 12 when energized, the ventilation outdoor fan 15 Sterilized by irradiating with ultraviolet rays from the ultraviolet irradiation unit 13 to the outside air sucked from the suction port 15A by the operation and blown out from the suction port 12A of the indoor fan 12 for ventilation to the inside of the indoor unit 1 through the ventilation pipe 19. The sterilized outside air may be configured to blow into the room from the lower outlet 4A of the main body case 4.

  In addition, when the ultraviolet irradiation part 13 was provided beside the indoor fan 12 for ventilation as mentioned above, and sterilized by irradiating the external air blown from the inlet 12A of the indoor fan 12 for ventilation with ultraviolet rays, it blown out from the inlet 12A In order to guide the outside air to the ultraviolet irradiation unit 13, it is preferable to cover the suction port 12 </ b> A with an appropriate fan cover to create an air path reaching the ultraviolet irradiation unit 13.

It is explanatory drawing which shows one Example of this invention. It is explanatory drawing which shows the principal part of one Example. It is explanatory drawing which shows an example of the structure of a gas sensor, (A) is explanatory drawing seen from the top, (B) is explanatory drawing seen from the side, (C) is explanatory drawing seen from the bottom. It is explanatory drawing which shows the method of measuring a carbon dioxide concentration.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Indoor unit 2 Rear case 3 Front case 3A Inlet 4 Main body case 4A Outlet 5 Heat exchanger 6 Heat exchanger tube 7 Blower fan 8 Drain pan 9 Air filter 10 Electrical part 11 Grid base 12 Ventilation indoor fan 12A Inlet 12B Inlet Outlet 14 Wind direction changer 15 Ventilation outdoor fan 15A Inlet 15B Outlet 16 Refrigerant tube cover 16A Inlet 18 Refrigerant tube 19 Ventilation tube 20 Gas sensor 21 Wire net 22 Zeolite 23 Nonwoven fabric 24 Upper opening 25 Filter cap 26 Gas sensing unit 27 Heater 28 Amplifier 29 Heater voltage Vh
30 Output voltage Vo

Claims (4)

  In an air conditioner equipped with a gas sensor that measures the concentration of carbon dioxide in the air in the indoor unit, the carbon dioxide concentration measured by the gas sensor is corrected based on the wind speed of the indoor air that exchanges heat with the refrigerant in the heat exchanger of the indoor unit. An air conditioner comprising a controller that outputs a control signal based on the corrected carbon dioxide concentration.   Controller is not the actual velocity of the room air, the air conditioner according to claim 1, wherein the corrected concentration of carbon dioxide gas sensor was measured based on the rated wind speed or wind speed level, and outputs a control signal.   The air conditioner according to claim 1 or 2, wherein the carbon dioxide concentration in the air is measured by a heated gas sensor.   Discharged to the outside of at least room air, the operation of the ventilation means or is provided to be incorporation into the room of the outdoor air, characterized in that it is controlled based on a control signal output from the controller The air conditioner in any one of Claims 1-3.

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