JP2011106697A - Air-conditioning indoor unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem on a risk of adversely affecting personnel in a building in a case when a carbon dioxide refrigerant leaks to an indoor unit side, as the carbon dioxide refrigerant is harmful to humans, in an air conditioning device using a refrigeration circuit applying carbon dioxide as the refrigerant. <P>SOLUTION: This air-conditioning indoor unit A includes a sensor 11 disposed at a supply-side space 32 of a ventilation flue 33, a ventilation air trunk 20 for communicating an outdoor circulation port connected to an outdoor side with a ventilation flue circulation port 35 connected to a suction-side space 31 of the ventilation flue 33, a ventilator 13 disposed in the ventilation air trunk 20 for distributing the air outdoors or to the suction-side space 31 of the ventilation flue 33, and a first control means for stopping an air blower 2 and operating the ventilator 13 to blow off the air in the suction-side space 31 outdoors from the ventilation air trunk 20, when a concentration of carbon dioxide detected by the sensor 11 reaches a first concentration value or more immediately badly affecting a person staying indoors. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an air conditioning indoor unit that discharges refrigerant to the outside when the refrigerant leaks from the indoor unit of the air conditioner.

  Conventionally, as this type of air conditioner, as described in Patent Document 1 below, a device provided with a safety device so as to cover the connection location of the refrigerant piping in the refrigerant circuit at the site is known. Yes. This safety device is provided with leaked refrigerant discharge means for releasing the leaked refrigerant to the atmosphere when a refrigerant leak occurs from the connection location.

  Further, as described in Patent Document 2 below, an air conditioning system for a vehicle using a refrigeration circuit using a combustible gas as a refrigerant is also known. According to this air conditioning system, the combustible gas concentration is detected by the combustible gas detection means provided in the vehicle compartment or in the air circuit of the vehicle, and an alarm for refrigerant leakage is issued when the detected value exceeds the reference value. It has become.

JP 2004-286315 A JP 2005-3220 A

In recent years, development of an air conditioner using carbon dioxide as a refrigerant replacing the HFC refrigerant (R410A) that has been widely used as a countermeasure for the ozone layer has been promoted.
By the way, even if the conventional general-purpose R410A is discharged into the building as it is when the refrigerant leaks in the indoor unit, it is almost harmless to the human body and thus has little effect on the personnel in the building. On the other hand, since carbon dioxide is harmful to the human body, if the carbon dioxide refrigerant is discharged into the building as it is, it may adversely affect the people in the building (nausea, decreased breathing, unconsciousness).

  The present invention has been made in order to solve the above-described problems. When carbon dioxide refrigerant leaks from an indoor unit of an air conditioner, the operation of the air conditioner is performed in order to ensure the safety of a person in the room. The purpose of the present invention is to obtain an air conditioning indoor unit capable of discharging the carbon dioxide refrigerant leaking inside the air conditioning indoor unit main body to the outside of the room.

  An air conditioning indoor unit according to the present invention includes an air conditioning indoor unit main body having an air inlet for sucking indoor air and an air outlet for blowing air into the room, and an air inlet and an air outlet formed in the air conditioning indoor unit main body. An air passage that connects the air passage, an indoor heat exchanger of a refrigerant circuit that divides the air passage into a suction side space and a blowout side space, and a blower disposed in the air passage. In an air conditioning indoor unit that uses carbon dioxide as a refrigerant, a first carbon dioxide concentration detecting means disposed in the blowout side space of the ventilation path, an outdoor circulation port provided in the air conditioning indoor unit main body and connected to the outdoor side, and a suction side of the ventilation path A ventilation air passage that communicates with a ventilation passage circulation port connected to the space, a ventilation fan that is arranged in the ventilation air passage and blows air toward the outside or the suction side space of the ventilation passage, and a first carbon dioxide concentration detection When the carbon dioxide concentration detected by the means exceeds the first concentration value that immediately has an adverse effect on people in the room, the blower is stopped and the ventilation fan is operated to ventilate the air in the suction side space of the ventilation path And a first control unit that blows out from the air passage to the outside of the room.

  In the present invention, when the carbon dioxide concentration detected by the first carbon dioxide concentration detecting means arranged in the blowout side space of the ventilation path is equal to or more than a value that immediately has an adverse effect on the person in the room, Because it is configured to stop and operate the ventilation fan to blow the air in the suction side space of the ventilation path out of the ventilation air path, immediately when carbon dioxide refrigerant leaks from the air conditioning indoor unit installed indoors The carbon dioxide refrigerant in the air conditioning indoor unit can be discharged to the outside. Therefore, it has the effect of preventing the carbon dioxide refrigerant from the air conditioning indoor unit from flowing into the room and adversely affecting people.

It is the front block diagram which removed and looked at the front board of the air-conditioning indoor unit of the air conditioning apparatus in Embodiment 1 of this invention. It is the side block diagram which removed and looked at the side plate of the one side of the air-conditioning indoor unit in Embodiment 1 of this invention. It is a schematic block diagram which shows the arrangement | positioning which installed the air-conditioning indoor unit in Embodiment 1 of this invention in the building. It is a schematic block diagram of the control apparatus of an air-conditioning indoor unit and its peripheral device in Embodiment 1 of this invention. It is a schematic block diagram which shows the flow of the wind at the time of normal operation of the air conditioning indoor unit in Embodiment 1 of this invention. It is a flowchart which shows operation | movement of the air conditioning indoor unit in Embodiment 1 of this invention. It is a schematic block diagram which shows the flow of the wind at the time of the carbon dioxide refrigerant leak detection of the air conditioning indoor unit in Embodiment 1 of this invention. It is a schematic block diagram which shows the flow of the wind at the time of ventilation in the building of the air conditioning indoor unit in Embodiment 1 of this invention. It is a flowchart which shows operation | movement of the air-conditioning indoor unit in Embodiment 2 of this invention. It is a schematic block diagram which shows the flow of the wind at the time of normal operation of the air conditioning indoor unit in Embodiment 3 of this invention. It is a flowchart which shows operation | movement of the air-conditioning indoor unit in Embodiment 3 of this invention. It is a schematic block diagram which shows the flow of the wind at the time of the carbon dioxide refrigerant leak detection of the air conditioning indoor unit in Embodiment 3 of this invention. It is a schematic block diagram which shows the flow of the wind at the time of ventilation in the building of the air conditioning indoor unit in Embodiment 3 of this invention. It is a flowchart which shows operation | movement of the air conditioning indoor unit in Embodiment 4 of this invention.

Embodiment 1 FIG.
FIG. 1 is a front configuration diagram illustrating a state in which a front plate of an air conditioning indoor unit according to an embodiment of the present invention is removed, and FIG. 2 is a side view illustrating a state in which a left side plate is removed from FIG. It is a block diagram.
In each figure, the indoor unit A for air conditioning according to this embodiment includes left and right side plates 22, 23, a top plate 24 supported on the left and right side plates 22, 23, a back plate 25, a front plate 26, An air conditioning indoor unit main body 28 formed in a box shape from the bottom plate 27 is provided. Inside the air conditioning indoor unit main body 28 is a ventilation path 33 that communicates the air suction port 29 below the front plate 26 and the air outlet 30 of the top plate 24. In this ventilation path 33, the indoor heat exchanger 1, which is a component of a general-purpose refrigerant circuit R (see FIG. 4), is installed in an inclined arrangement with the front side raised. The indoor heat exchanger 1 divides the ventilation path 33 in the air conditioning indoor unit main body 28 into the air suction side space 31 and the air blowing side space 32 so as to allow ventilation.

  A blower 2 such as a sirocco fan and a motor 3 for driving the blower 2 are fixed to the lower surface of the top plate 4. The power of the motor 3 is transmitted to the blower 2 through the fan pulley 4, the motor pulley 5, and the belt 6. A drain pan 7 that receives drain water from the indoor heat exchanger 1 is disposed at a position below the indoor heat exchanger 1 in the air conditioning indoor unit main body 28. In the air conditioning indoor unit main body 28, the lower space of the drain pan 7 is divided into two spaces by the partition plate 17. One space is provided with a control device 16 for driving the motor 3 and the like, and an alarm device 15 for issuing an alarm. The other space is a ventilation air passage 20. In the drain pan 7, a ventilation passage circulation port 35 that connects the ventilation air passage 20 and the suction side space 31 is formed. An exhaust pipe 14 is attached below the drain pan 7 through the back plate 25. Thereby, the outdoor circulation port 43 of the exhaust pipe 14 connected to the outside communicates with the ventilation air passage 20. That is, the ventilation path 33 and the ventilation path 20 are partitioned by the drain pan 7 disposed at a position below the indoor heat exchanger 1 in the ventilation path 33.

  A ventilating fan 13 is provided at the ventilation passage circulation port 35 of the drain pan 7 located below the expansion valve 8, the distributor 9, and the header 10. This assumes that refrigerant leakage is likely to occur at the brazed portion of the pipe. The ventilation fan 13 is configured to be able to rotate forward and backward so that the direction of the wind can be reversed. As such a ventilating fan 13 capable of forward and reverse rotation, for example, a solar ventilation fan (model: SOLAR VENT 24AE) manufactured by Kiryu Co., Ltd. can be used.

  The air outlet 30 of the air conditioning indoor unit main body 28 is provided with a sensor 11 (first carbon dioxide concentration detecting means). The sensor 11 detects carbon dioxide in the air blown from the air conditioning indoor unit A into the building 36 and outputs it to the control device 16. The control device 16 determines whether or not the detected carbon dioxide concentration is equal to or higher than a first concentration value (for example, 3%: Tokyo Fire Department standard value) harmful to the human body by carbon dioxide alone. In addition, the control device 16 determines that the detected carbon dioxide concentration has a second concentration value (for example, 0.5%: long-term safety limit concentration (TLV)) that can be determined as a carbon dioxide refrigerant leak, although the detected carbon dioxide concentration does not immediately affect the human body. ) Judge whether or not. At this time, when it is 0.5% or more and less than 3%, the control device 16 determines that the carbon dioxide concentration is abnormal (slow leak).

  In order to determine whether the air in the air conditioning indoor unit A has returned to normal, a sensor 12 (second carbon dioxide concentration detecting means) is provided in the vicinity of the exhaust pipe 14 of the ventilation air passage 20. The sensor 12 determines whether the carbon dioxide concentration in the air of the ventilation air passage 20 is less than a second concentration value (for example, 0.5%). If it is less than 0.5%, the control device 16 determines that the air condition in the air conditioning indoor unit A has become normal.

  The air conditioning indoor unit A is installed in a building 36 such as a building as shown in FIG. In the building 36, a main duct 37 is connected to the air outlet 30 of the air conditioning indoor unit A, and air is blown out from a plurality of branch ducts 38, 38,. Yes. In order to determine whether or not the carbon dioxide concentration in the building 36 is a normal value, a position as far as possible from the air conditioning indoor unit A in the building 36 (for example, the air conditioning indoor unit A is located on the left side in the building as shown in FIG. 3). When installed near the wall, a sensor 19 that detects the carbon dioxide concentration and outputs it to the control device 16 is provided at the right end position of the building. The control device 16 determines whether or not the detected carbon dioxide concentration is less than 0.5%. In the case of 0.5% or less, the control device 16 determines that the air condition in the building 36 is normal.

  Below, the table | surface which contrasted operation | movement of the sensors 11, 12, and 19 is shown.

  As shown in FIG. 4, the control device 16 is configured around an arithmetic processing unit (hereinafter abbreviated as CPU) and a memory M, and a sensor is connected to an input portion of a data bus DB connected to the CPU and the memory M. 11, 12, 19 and the external input device 42 are connected. The blower 2, the ventilation fan 13, the alarm device 57, and the communication device 58 are connected to the output unit of the data bus DB. The communication device 58 is connected to an alarm device of the management company 59 via a communication line. The CPU includes a function of normal operation means 45 that performs refrigerant operation or heating operation of the refrigerant circuit R. Further, the CPU will be described in detail later, the first concentration determination means 46, the second concentration determination means 47, the blower stop means 48, the casing air discharge means 49, the indoor air ventilation means 50, the indoor air determination means 51, Each function of alarm output means 52, report output means 53, first control means 54, second control means 55, and third control means 56 is provided. Program data for executing the functions of the respective means 46 to 56 is stored in the memory M in advance. Further, the first concentration value, the second concentration value, and the values used in the second and fourth embodiments relating to the carbon dioxide concentration to be described later are also set and inputted in advance from the external input device 42 and stored in the memory M. Yes. The refrigerant circuit R is configured such that the compressor 39, the outdoor heat exchanger 40, the expansion valve 8, and the indoor heat exchanger 1 are connected in a ring shape via a refrigerant pipe 41, respectively. Carbon dioxide is used as the refrigerant in the refrigerant circuit R.

Next, the operation will be described.
FIG. 5 shows the flow of wind in the air conditioning indoor unit A during normal operation with arrows. In the normal operation, the air conditioning indoor unit A sucks the air in the building 36 from the air suction port 29 of the front plate 26 by driving the blower 2, passes the indoor heat exchanger 1, and then enters the building from the air outlet 30. Air is blown to 36.

Then, the processing procedure of Embodiment 1 at the time of a carbon dioxide refrigerant leak detection is shown by the flowchart of FIG. 6, and the flow of the wind in the air-conditioning indoor unit A at that time is shown by the arrow in FIG.
First, when the carbon dioxide refrigerant leaks from the indoor heat exchanger 1 and the carbon dioxide concentration detected by the sensor 11 of the air outlet 30 of the air conditioning indoor unit A is output (step S1), the first concentration determination means 46 is executed in the CPU. This function determines whether or not the detected value is equal to or greater than a first concentration value (for example, 3% of the Tokyo Fire Department standards) that immediately has an adverse effect on people in the building 36. When the detected value is 3% or more (Yes in step S2), the function of the blower stopping means 48 stops the power supply to the motor 3 in order to suppress the carbon dioxide refrigerant from being filled in the building 36. Then, the blower 2 is stopped (step S3), and supply of cold / hot air to the building 36 is stopped. Further, the function of the casing air discharge means 49 operates the ventilation fan 13 (step S4). Thereby, the carbon dioxide refrigerant accumulated in the suction side space 31 of the ventilation passage 33 passes through the ventilation air passage 20 below the drain pan 7 and is discharged from the exhaust pipe 14 to the outside as indicated by the arrows in FIG. That is, the function of the 1st control means 54 is comprised from each function of the 1st density | concentration determination means 46, the air blower stop means 48, and the air discharge means 49 in a casing. On the other hand, the function of the alarm output means 52 outputs a command signal to the alarm device 15 to sound a buzzer, and prompts people in the building to evacuate. Further, the function of the notification output means 53 outputs a command signal to the communication device 58 to notify the management company 59 (step S5).

Fig. 8 shows the wind flow during ventilation in the building.
As described above, after the carbon dioxide in the air conditioning indoor unit A is exhausted from the exhaust pipe 14 to the outside, the sensor 12 detects the carbon dioxide concentration in the ventilation air passage 20 and outputs it to the control device 16 (step S6). . The function of the second concentration determination means 47 of the CPU is 0.5% (the first) in which the carbon dioxide concentration detected by the sensor 12 is a refrigerant leak but does not immediately have an adverse effect on the person in the building 36. It is determined whether or not it has become less than (2 density value) (step S7). When it is determined by the second concentration determination means 47 that the value is less than 0.5%, the function of the indoor air ventilation means 50 reversely drives the ventilation fan 13 to suck the outdoor air into the ventilation air passage 20 and the ventilation passage 33. The air is blown out from the air inlet 29 through the side space 31 into the building 36 in the opposite direction (step S8). That is, the function of the second control means 55 is constituted by the functions of the second concentration determination means 47 and the indoor air ventilation means 50.

  At this time, since the carbon dioxide refrigerant may be accumulated in a pipe (not shown) connecting the exhaust pipe 14 and the outside of the building, it is desirable to ventilate after a while since it is determined to be less than the second concentration value. . The period that can reach less than the second concentration value depends on the pipe length, pipe diameter, and air volume, but if it is about 1 minute, the exhaust pipe 14 and the carbon dioxide refrigerant in the pipe can be sufficiently discharged. Then, the sensor 19 detects the carbon dioxide concentration in the building 36 (step S9), and the function of the second concentration determination means 47 of the CPU determines that the detection value of the sensor 19 is less than 0.5%. In the case (Yes in step S10), the function of the indoor air determination means 51 determines that the carbon dioxide concentration in the building 36 has decreased to a normal value, and stops the ventilation fan 13 (step S11).

As described above, when the carbon dioxide refrigerant leaks, the operation of the blower 2 is stopped and the ventilation fan 13 is operated, so that the carbon dioxide refrigerant in the air conditioning indoor unit A can be discharged from the exhaust pipe 14 to the outdoors. When the carbon dioxide concentration in the air conditioning indoor unit A becomes less than the preset second concentration value, the ventilation fan 13 can be reversely rotated to introduce outside air from the exhaust pipe 14 to ventilate the inside 36 of the building. . As a result, the carbon dioxide concentration in the building 36 can be quickly reduced, and the safety of the personnel in the building 36 can be ensured.
And at the time of refrigerant | coolant leakage, the alarm device 15 can sound a buzzer, and can urge evacuation of the person in the building 36. In addition, by notifying the management company 59, it is possible to quickly repair the leaked portion of the air conditioning indoor unit A and to perform additional charging of the refrigerant, so that the stop time of the air conditioner can be suppressed.
Then, by installing the carbon dioxide sensor 19 in the building 36, it can be determined whether or not the carbon dioxide concentration in the building 36 has decreased to a normal value. Further, when it is determined that the carbon dioxide concentration in the building 36 is a normal value, ventilation can be ended. In addition, if the refrigerant leaks in the air conditioning indoor unit A but the refrigerant leakage amount does not threaten the safety of personnel in the building 36, the operation of the air conditioner is stopped for the early restoration of the air conditioning indoor unit A Then, the management company 59 can be notified.

Embodiment 2. FIG.
A second embodiment of the present invention will be described with reference to the flowchart of FIG. The configurations of the air conditioning indoor unit A and the refrigerant circuit R are the same as those in the first embodiment.
When the carbon dioxide refrigerant leaks in the air conditioning indoor unit A, the sensor 11 of the air outlet 30 detects carbon dioxide (step S1). Then, the function of the second concentration determination means 47 of the CPU is that the detected value of the sensor 11 is not an amount (3%) that is harmful to the personnel in the building 36 as in the first embodiment, but gradually the carbon dioxide. It is determined whether or not the value has reached a value (for example, 0.5%) that can be determined that the refrigerant is leaking (hereinafter referred to as slow leak). At this time, if it is determined that the ratio is 0.5% or more (Yes in step S14), the function of the blower stop means 48 stops the operation of the blower 2 (step S15), and the CPU air discharge means 49 in the casing of the CPU. The function operates the ventilation fan 13 to discharge the carbon dioxide refrigerant outside the apparatus (step S16). At the same time, the function of the notification output means 53 of the CPU operates the communication device 58 to cause the management company 59 to report a carbon dioxide refrigerant leak.

  As described above, when the sensor 11 of the air outlet 30 detects the slow leak of the carbon dioxide refrigerant, the operation of the blower 2 is stopped, and the carbon dioxide refrigerant in the air conditioning indoor unit A is discharged by the ventilation fan 13. As a result, the carbon dioxide concentration in the building 36 can be reduced. In addition, since the CPU and the communication device 58 report the carbon dioxide refrigerant leakage to the management company 59, it is possible to promptly repair the piping and refill the refrigerant, and suppress the stop time of the air conditioner. Can do.

Embodiment 3.
In the first and second embodiments described above, the air conditioner indoor unit A that takes in the air in the building 36 and blows it out again into the building 36 has been described. Next, implementation of an outside air intake system that takes in outside air and blows it out into the building 36 will be described. FIG. 10 shows an air conditioning indoor unit A1 according to the third embodiment.
The air conditioning indoor unit A1 includes an air conditioning indoor unit main body 28A in which no air suction port 29 is formed in the lower portion of the front plate 26 and an air circulation port 34 is formed in the lower portion of the back plate 25. The other configuration of the air conditioning indoor unit main body 28A is the same as that of the air conditioning indoor unit main body 28 described above. The duct 18 is connected to the air circulation port 34 of the back plate 25 described above. The tip of the duct 18 serves as an outside air inlet 44 for taking in outdoor air. This air-conditioning indoor unit A1 is a so-called all-fresh indoor unit that always sucks outside air from the duct 18 and blows out air-conditioned air from the air outlet 30 to the inside 36 of the building. As shown in FIG. 10, the exhaust pipe 14 is preferably provided through a duct 18 that connects the inside 36 of the building and the outside. The outdoor circulation port 43 of the exhaust pipe 14 is opened outdoors. By doing so, it is possible to reduce piping work for installing piping connecting the inside and outside of the building. That is, the all-fresh type duct 18 is used.

  FIG. 10 shows the flow of wind in the air-conditioning indoor unit A during normal operation using the outside air intake method with arrows. In the normal operation, the air conditioning indoor unit A1 sucks outside air from the outside air suction port 44 of the duct 18 into the suction side space 31 by driving the blower 2, passes the indoor heat exchanger 1, and then passes through the air outlet 30 to the building. It blows out to 36 of them.

Then, the processing procedure of Embodiment 3 at the time of a carbon dioxide refrigerant leak detection is shown with the flowchart of FIG. 11, and the flow of the wind in air-conditioning indoor unit A1 at that time is shown with the arrow at FIG. In the flowchart of FIG. 11, the processing from step S1 to step S8 is the same as that in the first embodiment.
That is, when the carbon dioxide refrigerant leaks from the indoor heat exchanger 1 and outputs the carbon dioxide concentration detected by the sensor 11 of the air outlet 30 of the air conditioning indoor unit A1 (step S1), the CPU of the control device 16 detects the detection. It is determined whether or not the value is equal to or higher than a first concentration value (for example, 3%) that immediately has an adverse effect on the person in the building 36. When the detected value is 3% or more (Yes in step S2), in order to prevent the carbon dioxide refrigerant from being filled in the building 36, the power supply to the motor 3 is stopped and the blower 2 is stopped ( Step S3), the supply of cold / hot air to the building 36 is stopped. On the other hand, by operating the ventilation fan 13 (step S4), outside air is sucked into the suction side space 31 from the duct 18, and the carbon dioxide refrigerant accumulated in the suction side space 31 passes through the ventilation air passage 20 below the drain pan 7. It is discharged from the exhaust pipe 14 to the outside of the machine. On the other hand, the CPU outputs a command signal to the alarm device 15 to sound a buzzer, prompts a person in the building 36 to evacuate, and outputs a command signal to the communication device 58 to notify the management company 59 ( Step S5).

Next, the flow of the wind at the time of ventilation in a building is shown in FIG.
As described above, after the carbon dioxide in the air conditioning indoor unit A is exhausted from the exhaust pipe 14 to the outside, the sensor 12 detects the carbon dioxide concentration in the ventilation air passage 20 and outputs it to the CPU (step S6). Then, the CPU determines whether or not the carbon dioxide concentration detected by the sensor 12 is less than 0.5% (second concentration value) that does not immediately have an adverse effect on the person in the building 36 although the refrigerant leaks. Is determined (step S7). When it is determined that the CPU has become less than 0.5%, the ventilation fan 13 is reversely driven to introduce outdoor air into the suction side space 31 from the exhaust pipe 14 and the ventilation air passage 20 (step S8). At the same time, the blower 2 is also operated to introduce outside air from the duct 18 into the suction side space 31 (step S8A). The outside air introduced from the exhaust pipe 14 and the outside air from the duct 18 join together in the suction side space 31 and pass through the indoor heat exchanger 1, and then blown out from the air outlet 30 to the inside 36 of the building. It is used for ventilation of 36 of them. Then, the sensor 19 detects the carbon dioxide concentration in the building 36 (step S9), and if the detected value of the sensor 19 is less than 0.5% (Yes in step S10), the CPU It is determined that the carbon dioxide concentration has decreased to a normal value, and the ventilation fan 13 and the blower 2 are stopped (steps S11 and S12).

  As described above, when the carbon dioxide refrigerant leaks, the operation of the blower 2 is stopped and the ventilation fan 13 is operated to suck in the outside air from the duct 18 so that the carbon dioxide refrigerant in the air conditioning indoor unit A1 is discharged from the exhaust pipe 14 to the outside. Can be discharged. On the other hand, when the carbon dioxide concentration in the air conditioning indoor unit A1 becomes less than the preset second concentration value, the ventilation fan 13 is reversely rotated to introduce outside air from the exhaust pipe 14 and the duct 18 is driven by the blower 2. In addition, a large amount of outside air can be introduced to quickly ventilate the interior 36 of the building. Thereby, the carbon dioxide concentration in the building 36 can be reduced extremely quickly, and the safety of the personnel in the building 36 can be ensured. That is, the function of the indoor air ventilation means 50 of the CPU is to operate the blower 2 and reversely drive the ventilation fan 13 to suck the outdoor air into the ventilation path 33 from the ventilation air path 20 and the outside air inlet 44 of the duct 18. It blows out from the outlet 30 to the inside 36 of the building. The function of the indoor air ventilation means 50 at this time is the function of the third control means 56. At the same time, the alarm device 15 sounds a buzzer, so that the personnel in the building 36 can be alerted and evacuated. In addition, by notifying the management company 59, it is possible to quickly repair the leaked portion of the air conditioning indoor unit A and to perform additional charging of the refrigerant, so that the stop time of the air conditioner can be suppressed. Then, by installing the carbon dioxide sensor 19 in the building 36, it can be determined whether or not the carbon dioxide concentration in the building 36 has decreased to a normal value. Further, when it is determined that the carbon dioxide concentration is a normal value, ventilation can be terminated.

Embodiment 4 FIG.
Embodiment 4 of the present invention will be described with reference to the flowchart of FIG. The configurations of the air conditioning indoor unit A1 and the refrigerant circuit R are the same as those in the third embodiment.
When the carbon dioxide refrigerant leaks in the air conditioning indoor unit A1, the sensor 11 of the air outlet 30 detects carbon dioxide (step S1). Then, the CPU detects that the detected value of the sensor 11 is not an amount (3%) that is harmful to the personnel in the building 36 as in the third embodiment, but is gradually leaking the carbon dioxide refrigerant. It is determined whether or not a value that can be determined (for example, 0.5%) or more is reached. At this time, if it is determined that it is 0.5% or more (Yes in Step S14), the blower 2 is operated (Step S15A) and the ventilation fan 13 is operated (Step S16). Thereby, a part of the air in the suction side space 31 is discharged from the ventilation air passage 20 to the outside of the building through the exhaust pipe 14. At the same time, the CPU operates the communication device 58 to notify the management company 59 of the carbon dioxide refrigerant leakage. At this time, the operation of the air conditioner is continued. Thereby, cold / warm air can be supplied even during the slow leak.

  As described above, for the air-conditioning indoor unit A1 of the outside air intake method, when the sensor 11 of the air outlet 30 detects a slow leak of carbon dioxide, the blower 2 and the ventilation fan 13 are operated, and the ventilation fan 13 operates the suction side space 31. Since the carbon dioxide refrigerant is discharged, the inside of the building 36 is ventilated so that the carbon dioxide refrigerant does not accumulate in the building 36. At that time, the air conditioning indoor unit A1 can continue to operate, and can supply cold and hot air to the inside 36 of the building. In addition, since the CPU and the communication device 58 report the carbon dioxide refrigerant leakage to the management company 59, it is possible to promptly repair the piping and refill the refrigerant, and suppress the stop time of the air conditioner. Can do.

  As described in the above embodiments, the space below the drain pan 7 is often a dead space, so the space below the drain pan 7 can be used effectively as the ventilation air passage 20. In addition, the control device 16 is often installed under the drain pan 7, and there is an advantage that the length of the wiring connecting the ventilation fan 13 and the control device 16 can be shortened.

  Further, in each of the above embodiments, the sensors 11, 12, and 19 all simply detect the carbon dioxide concentration value and output it to the CPU, and these detection values, the first concentration value, and the second concentration value are detected on the CPU side. The sensor 11, 12, 19, for example, “outputs when the first density value is exceeded” or “when it becomes less than the second density value” is determined. It is also possible to “output”.

DESCRIPTION OF SYMBOLS 1 Indoor heat exchanger, 2 Blowers, 3 Motor, 7 Drain pan, 8 Expansion valve, 11 Sensor (1st carbon dioxide concentration detection means), 12 Sensor (2nd carbon dioxide concentration detection means), 13 Exhaust fan, 14 Exhaust pipe, DESCRIPTION OF SYMBOLS 15 Alarm device, 16 Control apparatus, 18 Duct, 19 Sensor, 20 Ventilation air path, 28 Air-conditioning indoor unit main body, 28A Air-conditioning indoor unit main body, 29 Air inlet, 30 Air outlet, 31 Suction side space, 32 Outlet side space , 33 Ventilation channel, 34 Air circulation port, 35 Ventilation channel circulation port, 36 Inside building, 43 Outdoor circulation port, 44 Outside air intake port, 46 First concentration determination means, 47 Second concentration determination means, 48 Blower stop means, 49 Casing air discharge means, 50 indoor air ventilation means, 51 indoor air determination means, 54 first control means, 55 second control means, 56 third Control means, A air conditioning indoor unit, A1 air conditioning indoor unit, CPU arithmetic processing unit, R refrigerant circuit.

Claims (5)

An air-conditioning indoor unit main body having an air inlet for sucking indoor air and an air outlet for blowing air into the room, and a ventilation path formed in the air-conditioning indoor unit main body for communicating the air inlet and the air outlet And an indoor heat exchanger of a refrigerant circuit that divides the ventilation path into a suction side space and a blowout side space, and a blower disposed in the ventilation path, and is used as a refrigerant of the refrigerant circuit. In air conditioning indoor units using carbon,
A first carbon dioxide concentration detecting means disposed in the outlet side space of the ventilation path;
A ventilation air passage which is provided in the air conditioning indoor unit main body and communicates with an outdoor circulation port connected to the outside and a ventilation channel circulation port connected to the suction side space of the ventilation channel;
A ventilation fan that is arranged in the ventilation air passage and blows air toward the outside or the suction side space of the ventilation passage;
When the carbon dioxide concentration detected by the first carbon dioxide concentration detection means becomes equal to or higher than the first concentration value, the blower is stopped and the ventilation fan is operated to change the air in the suction side space of the ventilation path to the air An air conditioning indoor unit comprising: a first control unit that blows out from a ventilation air passage. A second carbon dioxide concentration detecting means arranged in the ventilation airway;
The first control means stops the blower and operates the ventilation fan to blow out the air in the suction side space of the ventilation path from the ventilation air path to the outside of the room, and then the carbon dioxide concentration detected by the second carbon dioxide concentration detection means And the second control means for blowing the outdoor air into the room through the ventilation air passage and the air inlet of the ventilation passage by driving the ventilation fan in the reverse direction when the air concentration becomes less than the second concentration value. The air conditioning indoor unit according to claim 1. An air-conditioning indoor unit body having an outside air inlet for sucking outdoor air and an air outlet for blowing air into the room, and a ventilation path formed in the air-conditioning indoor unit body to communicate the outside air inlet and the air outlet And an indoor heat exchanger of a refrigerant circuit that divides the ventilation path into a suction side space and a blowout side space, and a blower disposed in the ventilation path, and is used as a refrigerant of the refrigerant circuit. In air conditioning indoor units using carbon,
A first carbon dioxide concentration detecting means disposed in the outlet side space of the ventilation path;
A ventilation air passage which is provided in the air conditioning indoor unit main body and communicates with an outdoor circulation port connected to the outside and a ventilation channel circulation port connected to the suction side space of the ventilation channel;
A ventilation fan that is arranged in the ventilation air passage and blows air toward the outside or the suction side space of the ventilation passage;
When the carbon dioxide concentration detected by the first carbon dioxide concentration detection means becomes equal to or higher than the first concentration value, the blower is stopped and the ventilation fan is operated to change the air in the suction side space of the ventilation path to the air An air conditioning indoor unit comprising: a first control unit that blows out from a ventilation air passage. A second carbon dioxide concentration detecting means arranged in the ventilation airway;
The first control means stops the blower and operates the ventilation fan to blow out the air in the suction side space of the ventilation path from the ventilation air path to the outside of the room, and then the carbon dioxide concentration detected by the second carbon dioxide concentration detection means When the air temperature becomes less than the second concentration value, the third control is configured to operate the blower and reversely drive the ventilation fan to suck outdoor air from the ventilation air passage and the outside air inlet into the ventilation passage and blow it out into the room. The air conditioning indoor unit according to claim 3, wherein the air conditioning indoor unit is provided. The ventilation path and the ventilation air path are partitioned by a drain pan disposed at a position below the indoor heat exchanger in the ventilation path, and a ventilation path circulation port of the ventilation air path is formed in the drain pan. The air conditioning indoor unit according to any one of claims 1 to 4.

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