JP7439517B2 - Air blower and air blowing system - Google Patents

Description

The present invention relates to a blower device and a blower system.

In a system in which the indoor unit of an air conditioner and an exhaust port for exhausting indoor air to the outside are installed on the wall of a building, the exhaust port is placed at the bottom of the wall facing the wall where the indoor unit is installed, and the exhaust port is placed at the bottom of the wall facing the wall where the indoor unit is installed. It is known that by operating the ventilation fan of the indoor unit, convection generated by air blown out from the indoor unit is used to discharge leaked refrigerant from the indoor unit from the exhaust port (for example, Patent Document 1 reference).

Japanese Patent Application Publication No. 2001-012763

However, in the technology shown in Patent Document 1, convection is caused in the indoor air and the leaked refrigerant is discharged from the exhaust port at the bottom of the wall using this convection. It takes time for the leaked refrigerant that has risen to reach the exhaust port at the bottom of the wall surface, and there is a possibility that the time required for the leaked refrigerant to be discharged to the outside becomes longer.

This invention was made to solve such problems. The purpose is to promote the discharge of refrigerant that has leaked indoors to the outside, reduce the concentration of leaked refrigerant indoors, and prevent the leaked refrigerant from accumulating indoors and increasing the refrigerant concentration. and ventilation systems.

A blower device according to the present invention includes a blower unit that sends air into a room to generate an air current, and a leakage information acquisition unit that obtains information regarding a refrigerant leak in the room, and includes the room or a space communicating with the room. There is a part or all of a refrigerant circuit through which the refrigerant flows inside the room, and when the leakage information acquisition means acquires information indicating that a leakage of the refrigerant has been detected, the ventilation means opens an opening leading to the outside of the room. The air blowing means is capable of changing the direction of the air being blown, the room has a plurality of openings leading to the outside, and the leakage information acquisition means collects information on detection of refrigerant leakage. The air blowing means further includes a selection means for selecting one of the plurality of openings when the information is acquired, and when the leakage information acquisition means acquires information indicating that a refrigerant leak has been detected, the air blowing means selects one of the openings selected by the selection means. An airflow is generated toward the opening, and the selection means determines the opening to be selected depending on the time elapsed since the refrigerant leak was detected .

Alternatively, the blower device according to the present invention includes a blower unit that sends air into a room to generate an air current, and a leakage information acquisition unit that obtains information regarding a refrigerant leak in the room, A part or all of a refrigerant circuit through which the refrigerant flows is present in the communicating space, and when the leakage information acquisition means acquires information that a leakage of the refrigerant has been detected, the ventilation means is configured to send air to the outside of the room. The airflow means is capable of changing the direction of the air being blown, and the room has a plurality of openings leading to the outside, and the leakage information acquisition means is configured to generate airflow that increases the amount of exhaust air from the openings that communicate with each other. The blowing means further includes a selection means for selecting one of the plurality of openings when the leakage information acquisition means acquires the information that the leakage of the refrigerant is detected. The selection means generates an airflow that increases the exhaust amount from the opening selected by the selection means, and the selection means determines the opening to be selected depending on the time elapsed since the refrigerant leak was detected.

The air blowing system according to the present invention includes a first air blower having a first air blowing means that sends air into the room from a first position to generate an airflow, and a first air blower that sends air into the room from a second position to generate an airflow. a second air blower having two air blowing means, and a leakage information acquisition means for acquiring information regarding the leakage of refrigerant in the room, and in the room or a space leading to the room, there is a refrigerant circuit through which the refrigerant flows. When the leakage information acquisition means acquires information that a refrigerant leak has been detected, the first ventilation device and the second ventilation device The first air blower and the second air blower can change the direction of the air to be blown, and the first air blower and the second air blower can change the direction of the air to be blown by simultaneously blowing air from the outside to the outside of the room. There are a plurality of openings leading to the opening, and when the leakage information acquisition means acquires information indicating that a refrigerant leak has been detected, the leakage information acquisition means further includes a selection means for selecting one of the plurality of openings, and the first blower and the When the leakage information acquisition means acquires information that a refrigerant leak has been detected, the second blower device simultaneously blows air from the first blower and the second blower to the opening selected by the selection means. and the selection means determines the opening to select depending on the elapsed time since the refrigerant leak was detected .

According to the air blower and air blowing system according to the present invention, the refrigerant leaked indoors is promoted to be discharged outdoors to reduce the concentration of the leaked refrigerant indoors, and the leaked refrigerant remains indoors, increasing the refrigerant concentration. This has the effect of being able to prevent things from happening.

1 is a diagram showing a schematic configuration of a refrigerant circuit included in an air conditioner, which is a blower device according to Embodiment 1 of the present invention. 1 is a perspective view showing the configuration of an indoor unit of an air conditioner, which is a blower device according to Embodiment 1 of the present invention. 1 is a sectional view showing the configuration of an indoor unit of an air conditioner, which is a blower device according to Embodiment 1 of the present invention. 1 is a diagram schematically showing the configuration of a room in which an indoor unit of an air conditioner, which is a blower device according to Embodiment 1 of the present invention, is installed. 1 is a block diagram showing the configuration of a control system of a blower device according to Embodiment 1 of the present invention. FIG. It is a figure explaining the example of operation of the air blower concerning Embodiment 1 of this invention. It is a figure explaining the example of operation of the air blower concerning Embodiment 1 of this invention. It is a figure explaining the example of operation of the air blower concerning Embodiment 1 of this invention. It is a figure explaining the example of operation of the ventilation device and ventilation system concerning Embodiment 1 of this invention. It is a figure explaining the example of operation of the ventilation device and ventilation system concerning Embodiment 1 of this invention. FIG. 2 is a flow diagram showing an example of the operation of the air blower according to Embodiment 1 of the present invention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Modes for carrying out the invention will be described with reference to the accompanying drawings. In each figure, the same or corresponding parts are given the same reference numerals, and overlapping explanations will be simplified or omitted as appropriate. In the following description, for convenience, the positional relationship of each structure may be expressed based on the illustrated state. Note that the present invention is not limited to the following embodiments, and may freely combine each embodiment, modify any component of each embodiment, or modify each embodiment without departing from the spirit of the present invention. Any component of the embodiment can be omitted.

Embodiment 1.
Embodiment 1 of the present invention will be described with reference to FIGS. 1 to 11. FIG. 1 is a diagram schematically showing the configuration of a refrigerant circuit included in an air conditioner, which is a blower device. FIG. 2 is a perspective view showing the configuration of an indoor unit of an air conditioner, which is a blower device. FIG. 3 is a sectional view showing the configuration of an indoor unit of an air conditioner, which is a blower device. FIG. 4 is a diagram schematically showing the configuration of a room in which an indoor unit of an air conditioner, which is a blower, is installed. FIG. 5 is a block diagram showing the configuration of the control system of the blower device. 6 to 8 are diagrams illustrating an example of the operation of the blower device. FIGS. 9 and 10 are diagrams illustrating an example of the operation of the blower and the blower system. FIG. 11 is a flowchart showing an example of the operation of the blower.

In the following, an example in which the blower device according to this embodiment is an air conditioner capable of blowing air and conditioning the air will be described. However, the blower device according to the present invention does not necessarily have to be able to perform air conditioning, and can be applied to any device that can at least blow air.

As shown in FIG. 1, the air conditioner, which is a blower device according to this embodiment, includes an indoor unit 1 and an outdoor unit 2. The indoor unit 1 is installed inside a room to be air-conditioned, that is, indoors. The outdoor unit 2 is an indoor unit 1 installed outside the room, that is, outdoors, and includes an indoor heat exchanger 3 and an indoor fan 5. The outdoor unit 2 includes an outdoor heat exchanger 4, an outdoor fan 6, a compressor 7, an expansion valve 8, and a four-way valve 9.

The indoor unit 1 and the outdoor unit 2 are connected by a refrigerant pipe 10. The refrigerant pipe 10 is provided cyclically between the indoor heat exchanger 3 of the indoor unit 1 and the outdoor heat exchanger 4 of the outdoor unit 2. A refrigerant is sealed inside the refrigerant pipe 10. It is desirable to use a refrigerant with a small global warming potential (GWP) as the refrigerant sealed in the refrigerant pipe 10. For example, a refrigerant having a larger average molecular weight than air is used. The refrigerant in this case has a higher density than air and is heavier than air at atmospheric pressure. Therefore, the refrigerant in this case has the property of sinking downward in the direction of gravity (vertical direction) in the air.

Specific examples of such refrigerants include tetrafluoropropene (CF3CF=CH2:HFO-1234yf), difluoromethane (CH2F2:R32), propane (R290), propylene (R1270), ethane (R170), and butane (R600). ), isobutane (R600a), 1.1.1.2-tetrafluoroethane (C2H2F4:R134a), pentafluoroethane (C2HF5:R125), 1.3.3.3-tetrafluoro-1-propene (CF3- A (mixed) refrigerant consisting of one or more refrigerants selected from CH=CHF:HFO-1234ze), carbon dioxide (CO2:R744), etc. can be used.

The refrigerant pipe 10 connects the indoor heat exchanger 3, the four-way valve 9, the compressor 7, the outdoor heat exchanger 4, and the expansion valve 8 in an annular manner. Therefore, a refrigerant circuit is formed in which refrigerant circulates between the indoor heat exchanger 3 and the outdoor heat exchanger 4.

The compressor 7 is a device that compresses the supplied refrigerant to increase the pressure and temperature of the refrigerant. As the compressor 7, for example, a rotary compressor, a scroll compressor, a reciprocating compressor, etc. can be used. The expansion valve 8 expands the refrigerant condensed in the condenser 12 and reduces the pressure of the refrigerant. In the configuration example described here, the expansion valve 8 is a linear electric expansion valve (LEV). Therefore, by closing the expansion valve 8, the flow of refrigerant can be prevented.

The indoor heat exchanger 3 exchanges heat between the refrigerant that has flowed into the indoor heat exchanger 3 and the air around the indoor heat exchanger 3. The indoor fan 5 blows indoor air so that it passes around the indoor heat exchanger 3, promotes heat exchange between the refrigerant and the air in the indoor heat exchanger 3, and heats or heats the room by heat exchange. The cooled air is then sent back into the room. The outdoor heat exchanger 4 exchanges heat between the refrigerant that has flowed into the outdoor heat exchanger 4 and the air around the outdoor heat exchanger 4 . The outdoor fan 6 blows outdoor air around the outdoor heat exchanger 4 to promote heat exchange between the refrigerant and the air in the outdoor heat exchanger 4.

The refrigerant circuit configured in this way exchanges heat between the refrigerant and air in each of the indoor heat exchanger 3 and outdoor heat exchanger 4, thereby transferring heat between the indoor unit 1 and the outdoor unit 2. It works as a heat pump to move. At this time, by switching the four-way valve 9, the circulation direction of the refrigerant in the refrigerant circuit can be reversed, and the air conditioner can be switched between cooling operation and heating operation.

Next, a configuration example of the indoor unit 1 will be further described with reference to FIGS. 2 and 3. The air conditioner of the configuration example described here is a so-called room air conditioner. The indoor unit 1 is installed on a wall or a ceiling in the room. Here, it is assumed that the indoor unit 1 is installed on the wall surface of the room.

As shown in FIGS. 2 and 3, the indoor unit 1 includes a housing 110. The housing 110 of the indoor unit 1 is formed into a substantially rectangular parallelepiped shape that is horizontally long and has a smoothly curved surface from the front surface to the bottom surface. A suction port 111 is formed in the upper surface of the housing 110. The suction port 111 is an opening for taking air into the housing 110 from the outside. An air outlet 112 is formed at the lower front of the housing 110. The air outlet 112 is an opening for discharging air from the inside of the housing 110 to the outside. The upper front surface of the housing 110 is covered by a front panel 113.

The air outlet 112 is provided with vertical wind direction plates 131, 132, 141, and 142. These vertical wind direction plates are for adjusting the vertical blowing angle of the air blown out from the blowing outlet 112.

The upper and lower wind direction plates are respectively installed on the front side and the back side toward the front of the indoor unit 1. Further, each of the upper and lower wind direction plates on the front side and the back side are divided into left and right sides. That is, the front vertical wind direction plate is divided into a left front vertical wind direction plate 131 on the left side when facing the front of the indoor unit 1, and a right front vertical wind direction plate 132 on the right side. Further, the rear vertical wind direction plate is divided into a left rear vertical wind direction plate 141 on the left side when facing the front of the indoor unit 1, and a right rear side vertical wind direction plate 142 on the right side.

The position where each of the upper and lower wind direction plates is divided into left and right parts is approximately at the center in the longitudinal direction of the indoor unit 1 (in the left-right direction of the air outlet 112). A slight gap is formed between the left front vertical wind direction plate 131 and the right front vertical wind direction plate 132. Similarly, a small gap is also formed between the left rear vertical wind direction plate 141 and the right rear vertical wind direction plate 142.

The left front vertical wind direction plate 131, the right front vertical wind direction plate 132, the left back vertical wind direction plate 141, and the right back vertical wind direction plate 142 are plate-shaped members that extend in the left-right direction of the air outlet 112, respectively. Further, each of the upper and lower wind direction plates 131, 132, 141, and 142 is curved so that a cross section perpendicular to the longitudinal direction has an arc shape.

The vertical wind direction plates 131, 132, 141, and 142 are each attached to the housing 110 via support arms (not shown). Each support arm is rotatably attached to the housing 110. By rotating each support arm relative to the housing 110, the orientation of each vertical wind direction plate can be changed. By changing the direction of the vertical wind direction plate, the indoor unit 1 can change the air blowing direction up and down.

The support arms of the vertical wind direction plates are provided so that their angles can be changed independently from each other by driving a stepping motor for the vertical wind direction plates (not shown). Therefore, the vertical blowing angle (air blowing direction) of the air blown out from the left side of the blower outlet 112 and the vertical blowing angle (blowing direction) of the air blowing out from the right side of the blower outlet 112 can be adjusted separately.

Left and right wind direction plates 150 are provided on the back side of the vertical wind direction plates 131, 132, 141, and 142 in the air outlet 112. The left-right wind direction plate 150 is for adjusting the blowing angle of the air blown out from the blow-off port 112 in the left-right direction. The left and right wind direction plate 150 is made up of a plurality of plate members arranged in the longitudinal direction (the left and right direction of the air outlet 112) toward the front of the indoor unit 1.

The plurality of left and right wind direction plates 150 are attached so that their angles can be adjusted by driving a stepping motor for left and right wind direction plates (not shown). At this time, the left and right wind direction plates 150 on the left side of the air outlet 112 and the left and right wind direction plates 150 on the right side of the air outlet 112 are arranged so that their angles can be changed independently like the upper and lower wind direction plates 131, 132, 141, and 142. It is provided. Therefore, in the indoor unit 1 of this configuration example, the left and right air blowing directions from the air outlet 112 can be adjusted separately not only in the vertical direction but also in the horizontal direction.

An air path leading from the suction port 111 to the blowout port 112 is formed inside the housing 110 . The indoor heat exchanger 3 is arranged on the leeward side of the suction port 111 in the air path. The indoor heat exchanger 3 adjusts the temperature, humidity, etc. of the air by heating or cooling the air flowing through the air path, and generates conditioned air. Note that during heating operation, warm air is generated as conditioned air, and during cooling operation, cold air is generated as conditioned air.

An indoor fan 5 is installed on the leeward side of the indoor heat exchanger 3 in the air path. The indoor fan 5 is for generating an air flow from the suction port 111 toward the blowout port 112 in the air path.

When the indoor fan 5 operates, an air flow from the suction port 111 to the blowout port 112 is generated in the air passage, air is sucked in from the suction port 111, and air is blown out from the blowout port 112. The air sucked in from the suction port 111 becomes an airflow that passes through the air path inside the indoor unit 1, the indoor heat exchanger 3, and the indoor fan 5 in this order, and is blown out from the blowout port 112. At this time, the direction of the wind blown out from the outlet 112 (blow direction) is adjusted (changed) by the vertical wind direction plates 131, 132, 141, 142 and the left and right wind direction plates 150 arranged on the leeward side of the indoor fan 5. Ru.

What is the indoor fan 5, the vertical wind direction plates 131, 132, 141, 142, the left and right wind direction plates 150, and the stepping motor for changing the direction of these wind direction plates of the indoor unit 1 configured as above? , constitutes a blowing means that sends air indoors from the outlet 112 to generate an airflow indoors. The blowing means in this configuration example can change the direction of the conditioned air blown out from the outlet 112.

An infrared sensor 170 is attached to the center of the front surface of the indoor unit 1. However, the mounting position of the infrared sensor 170 is not limited to the center of the front surface of the indoor unit 1. The infrared sensor 170 may be attached, for example, to the left or right end of the housing 110.

The infrared sensor 170 includes, for example, a plurality of infrared receiving elements arranged vertically. Each of the plurality of infrared light receiving elements is a detection element that can individually receive infrared light and detect temperature. These infrared light receiving elements are arranged vertically in a straight line inside a cylindrical metal can, for example. As a result, the infrared sensor 170 has a function of detecting the indoor temperature by dividing it into a plurality of areas having different heights.

The detection range of each of the plurality of infrared light receiving elements is set as a rectangular area of equal size. Further, regarding the light distribution viewing angle of one infrared light receiving element, for example, the vertical light distribution viewing angle in the vertical direction is set to 7 degrees, and the horizontal light distribution viewing angle in the left and right direction is set to 8 degrees.

The light distribution viewing angle of the entire infrared sensor 170, which is the sum of the light distribution viewing angles of the respective infrared light receiving elements, is set as an elongated area in the vertical direction. Note that the light distribution viewing angles (detection ranges) of the respective infrared light receiving elements may not have the same shape and size. Moreover, the specific values of the vertical light distribution viewing angle and the horizontal light distribution viewing angle are not limited to the above-mentioned examples.

The infrared sensor 170 can change the direction of the plurality of infrared receiving elements arranged vertically to the left or right within a preset angular range by a sensor stepping motor (not shown). By doing this, each of the plurality of infrared receiving elements arranged vertically is scanned in the left and right direction, and the detection range (hereinafter referred to as "temperature detection target range") set in advance in front of the indoor unit 1 is scanned in the horizontal direction. Surface temperature can be detected.

With such a configuration, the infrared sensor 170 scans the temperature detection target range and acquires the surface temperature distribution (thermal image) within the range in a non-contact manner. Such a detection result of the infrared sensor 170 is surface temperature distribution (thermal image) data acquired by the infrared sensor 170.

Note that the detection range of the infrared sensor 170 in the left-right direction may be configured such that the sensor stepping motor 172 can rotate the infrared sensor 170 one complete rotation, and the detection range may be set to 360°. Further, the infrared sensor 170 may also be made to swing in the vertical direction using another stepping motor or the like. By making it possible to change the direction of the infrared sensor 170 in the vertical direction, detailed thermal image data can be obtained not only in the horizontal direction but also in the vertical direction.

Note that the infrared sensor 170 may be configured to use other detection equipment, or may be replaced with another detection equipment. For example, a camera, an ultrasonic sensor, or the like may be used together with the infrared sensor 170 to detect the position, shape, and distance of the object. By doing so, the accuracy of detecting the position and distance of the object by the infrared sensor 170 can be improved.

Next, an example of a room in which the indoor unit 1 configured as described above is installed will be described with reference to FIG. 4. In the example shown in the figure, the indoor unit 1 is installed on the wall surface of the room. As described above, the indoor unit 1, which is a blower device, includes a blower unit that blows air into the room from the blower outlet 112 to generate an airflow. Furthermore, as described above, the indoor heat exchanger 3 is housed inside the indoor unit 1, and a portion of the refrigerant piping 10 connected to the indoor heat exchanger 3 is also located inside the indoor unit 1. Therefore, in the room where the indoor unit 1 is installed, there is a part of the refrigerant circuit through which the refrigerant flows. Note that the entire refrigerant circuit may be present indoors, for example, by installing a device in which the entire refrigerant circuit is housed, such as a refrigerator.

Furthermore, part or all of the refrigerant circuit through which the refrigerant flows may be present not in the room itself but in a space leading to the room. An example of this is a case where a part or the entire refrigerant circuit is housed in a housing of a device installed in a ceiling or the like, such as an indoor unit of a so-called package air conditioner. In this case, the space inside the housing of the device is the space that communicates with the room.

An opening 20 communicating with the outside of the chamber is formed in this chamber. Here, an air supply port 21, a ventilation fan 22, a window 23, and a door 24 are provided as openings 20 leading to the outside of the room. The air supply port 21 is always open. The ventilation fan 22 includes a ventilation fan 22a provided at the ventilation port. The window 23 can be opened and closed. Although the door 24 can also be opened and closed, a gap is formed at the bottom regardless of whether the door 24 is opened or closed. When these air supply ports 21, ventilation fans 22, windows 23, and doors 24 are collectively referred to without distinction, they are referred to as openings 20. In this way, in the configuration example described here, there are a plurality of openings 20 that communicate with the outside of the room.

FIG. 5 shows the configuration of a control system of an air conditioner, which is an air blower according to this embodiment. As shown in the figure, the blower device of this embodiment includes a refrigerant leak sensor 11. The refrigerant leak sensor 11 is installed inside the housing 110 of the indoor unit 1, for example. The refrigerant leak sensor 11 can detect at least the same type of refrigerant as that sealed in the refrigerant pipe 10 . The refrigerant leak sensor 11 can be a sensor of various types, such as a catalytic combustion type, a semiconductor type, a thermal conduction type, a low potential electrolytic type, and an infrared type.

Further, an oxygen sensor can also be used as the refrigerant leak sensor 11. When an oxygen sensor is used, the oxygen concentration is determined based on the sensor output, and the concentration of the inflow gas is calculated backwards, assuming that the decrease in oxygen concentration is due to the inflow gas, thereby indirectly determining the concentration of the inflow gas, that is, the refrigerant. can be detected. As the oxygen sensor, various types such as a galvanic cell type, a polaro type, and a zirconia type can be used.

The air conditioner, which is the blower of this embodiment, uses the detection result of the refrigerant leakage sensor 11 to detect the occurrence of refrigerant leakage indoors. Note that the installation location of the refrigerant leak sensor 11 is not limited to the inside of the housing 110 of the indoor unit 1 described above. The refrigerant leak sensor 11 can be installed at any location other than the indoor unit 1 as long as it can detect refrigerant leaking into the room.

Further, as shown in FIG. 5, the air conditioner according to this embodiment includes a leak detection section 51, a storage section 52, a notification section 55, a control section 53, and a selection section 54. Each of these parts is configured by, for example, a circuit installed in a control device of an air conditioner, which is a blower device.

The leakage detection unit 51 detects the occurrence of refrigerant leakage indoors based on the detection result of the refrigerant leakage sensor 11 . As described above, the refrigerant leak sensor 11 can directly or indirectly detect the refrigerant sealed in the refrigerant pipe 10. Then, the refrigerant leak sensor 11 outputs a detection signal according to the detected concentration of refrigerant.

A detection signal output from the refrigerant leak sensor 11 is input to the leak detection section 51. Leakage detection unit 51 determines whether the refrigerant concentration indicated by the detection signal from refrigerant leakage sensor 11 is equal to or higher than a leakage determination reference value. The leakage determination reference value is a preset value. The preset leakage determination reference value is stored in the storage unit 52. The leakage detection unit 51 makes a determination by comparing the leakage determination reference value acquired from the storage unit 52 and the refrigerant concentration indicated by the detection signal from the refrigerant leakage sensor 11.

When the refrigerant concentration indicated by the detection signal from the refrigerant leak sensor 11 is equal to or higher than the leak determination reference value, the leak detector 51 outputs a refrigerant leak detection signal to the controller 53. The refrigerant leak detection signal is a signal indicating that a refrigerant leak indoors has been detected. In this way, the refrigerant leak sensor 11 and the leak detector 51 constitute a leak detector capable of detecting refrigerant leak indoors.

The leak detection means may also use the difference between the temperature of the air flowing into the indoor heat exchanger 3 and the temperature of the air flowing out from the indoor heat exchanger 3. In this case, a temperature sensor is provided to detect the temperature of the air before and after passing through the indoor heat exchanger 3. The leak detection unit 51 detects when the temperature difference between the air before and after passing through the indoor heat exchanger 3 is smaller than a preset reference value even though the air conditioner is in cooling or heating operation. , outputs a refrigerant leakage detection signal, assuming that the amount of refrigerant in the refrigerant circuit is decreasing due to leakage.

Note that the refrigerant leak sensor 11 and the leak detection section 51 may not be provided in the blower (air conditioner). That is, the refrigerant leak sensor 11 and the leak detection section 51 may be provided outside the blower. In this case, the air conditioner, which is a blower, includes a leakage information acquisition section instead of the refrigerant leakage sensor 11 and the leakage detection section 51. A refrigerant leakage detection signal output from the leakage detection section 51 outside the blower is input to the leakage information acquisition section of the blower. This refrigerant leakage detection signal is an example of information regarding refrigerant leakage indoors. The leakage information acquisition unit is a leakage information acquisition unit that acquires information regarding the leakage of refrigerant indoors.

On the other hand, when the blower includes the refrigerant leak sensor 11 and the leak detector 51, the refrigerant leak sensor 11 and the leak detector 51 acquire a refrigerant leak detection signal, which is information regarding the leak of refrigerant indoors, by themselves. In this sense, it can be said to be a means of acquiring leaked information. Therefore, regardless of whether the refrigerant leak sensor 11 and the leak detection section 51 are provided in the blower or outside the blower, the blower is equipped with leakage information acquisition means. Then, a refrigerant leakage detection signal, which is information regarding the leakage of refrigerant indoors, acquired by the leakage information acquisition means, is input to the control unit 53.

The control unit 53 controls the overall operation of the air conditioner by controlling an actuator included in the air conditioner, which is a blower device. The objects to be controlled by the control unit 53 include the indoor fan 5 explicitly shown in FIG. In addition to the left and right wind direction plates 150, that is, the above-mentioned air blowing means, for example, the outdoor fan 6, the compressor 7, the four-way valve 9, etc. are included.

When a refrigerant leakage detection signal is input from the leakage detection unit 51, that is, when the leakage information acquisition means acquires information indicating that a refrigerant leakage has been detected, the control unit 53 controls the operation of the air conditioner, which is a blower. Shift the mode from "normal mode" to "refrigerant discharge mode." In the "refrigerant discharge mode", the control unit 53 performs a preset operation upon detecting a refrigerant leak. Basically, the operation when detecting a refrigerant leak is to send an airflow from the outlet 112 toward the opening 20 leading to the outside of the room, or an airflow that increases the exhaust volume from the opening 20 into the room using the above-mentioned blowing means. This is the action of generating. Next, an example of the operation when detecting a refrigerant leak in this embodiment will be described with reference to FIGS. 5 and 6 to 10.

First, FIG. 6 shows a first example of the operation when detecting a refrigerant leak. In this first example, the control section 53 to which the refrigerant leakage detection signal has been input issues a command to the selection section 54 . Upon receiving the command from the control unit 53, the selection unit 54 selects one of the plurality of openings 20. The selection unit 54 is a selection unit that selects one of the plurality of openings 20 when the leak information acquisition unit described above acquires information that a refrigerant leak has been detected. In the example shown in FIG. 6, the selection unit 54 selects the ventilation fan 22.

The selection unit 54 selects one of the plurality of openings 20, for example, depending on the elapsed time since the refrigerant leak was detected. When refrigerant leaks from the refrigerant circuit of the indoor unit 1, it is considered that a large amount of the leaked refrigerant 30 still exists near the indoor unit 1 if not much time has passed since the refrigerant leak was detected. Therefore, the selection unit 54 selects the ventilation fan 22 closest to the indoor unit 1. As time passes after the refrigerant leak is detected, the leaked refrigerant 30 settles inside the room. Therefore, the selection unit 54 selects the air supply port 21 or the door 24 located at a lower position in the room, depending on the length of time that has passed since the refrigerant leakage was detected.

As another example, the selection unit 54 may select one of the plurality of openings 20 depending on the concentration difference of the leaked refrigerant 30 indoors. In this case, for example, refrigerant leak sensors 11 are installed at multiple locations in the room. Then, the selection unit 54 selects the opening 20 near the location where the leaked refrigerant 30 has a high concentration indoors.

Further, as another example, the selection unit 54 may select one of the plurality of openings 20 according to the pressure difference between the inside and outside of each opening 20. In this case, each opening 20 is provided with a sensor that detects the difference between the pressure on the indoor side and the pressure on the outdoor side of the opening 20. Then, the selection unit 54 selects the opening 20 where the pressure on the indoor side is higher than the pressure on the outdoor side. At this time, if there are a plurality of openings 20 in which the pressure on the indoor side is higher than the pressure on the outdoor side, it is preferable to select the opening 20 with the largest pressure difference between the indoor side and the outdoor side.

Furthermore, the priority for selecting each opening 20 may be set depending on whether the opening 20 leads to the outdoors or indoors. That is, the opening 20 leading from the indoor to the outdoors is set to have a higher priority than the opening 20 leading from the indoor to the indoor (another room, a hallway, etc.). As a result, the opening 20 leading to the outdoors is selected preferentially over the opening 20 leading indoors. In the illustrated example, the air supply port 21, ventilation fan 22, ventilation fan 22a, and window 23 are openings 20 that communicate with the outdoors. On the other hand, the door 24 is an opening 20 leading indoors.

The priority for selecting each opening 20 may be set depending on the type, properties, etc. of the leaked refrigerant 30, that is, the refrigerant flowing through the refrigerant circuit. In this case, for example, when the density of the leaked refrigerant 30 is higher than that of air, the priority is set such that the lower the installation position of the plurality of openings 20, the more preferentially the one is selected. When the density of the leaked refrigerant 30 is similar to or lower than that of air, the priority is set such that the higher the installation position of the plurality of openings 20, the more preferentially the openings are selected.

In the example described above, the selection unit 54 uses information regarding the position of each opening 20 when selecting one of the plurality of openings 20. Here, two examples will be given as methods for acquiring positional information of each opening 20. First, in the first example, the positions of each of the plurality of openings 20 are stored in the storage section 52 in advance. In this example, the storage unit 52 corresponds to storage means that stores the positions of the plurality of openings 20 in advance.

In the second example, the positions of each of the plurality of openings 20 are specified using the detection results of the infrared sensor 170, that is, the surface temperature distribution (thermal image) data acquired by the infrared sensor 170. It is considered that the temperature inside the opening 20 communicating with the outside of the room is often different from that inside the room due to the influence of outdoor air. Therefore, based on the surface temperature distribution data acquired by the infrared sensor 170, for example, an area having a temperature different from that of the surrounding indoor wall surface is specified, and this specified area is detected as the position of the opening 20. In this example, the infrared sensor 170 corresponds to an opening detection means that detects the positions of the plurality of openings 20. In addition, for example, a part or all of each opening 20 may be provided with an infrared transmitter that emits infrared rays of a specific frequency, and the infrared sensor 170 may detect the infrared rays of a specific frequency emitted from the infrared transmitter. It is also possible to detect the position of.

As described above, the air blowing means included in the indoor unit 1 can change the direction of air blown from the air outlet 112. The control unit 53 controls the air blowing means, particularly the left front vertical wind direction plate 131, the right front vertical wind direction plate 132, the left rear vertical wind direction plate 141, and the right rear upper and lower wind direction plates so that the wind direction is directed to the opening 20 selected by the selection unit 54. The directions of the wind direction plate 142 and the left and right wind direction plates 150 are changed if necessary. The direction of each wind direction plate is changed by controlling the operation of a stepping motor for each wind direction plate. Then, the control unit 53 operates the indoor fan 5. The rotation speed of the indoor fan 5 at this time is preferably set to the maximum within a preset allowable range.

As a result, an airflow is generated indoors from the air outlet 112 toward the opening 20 selected by the aforementioned selection means. Therefore, when the above-mentioned leakage information acquisition means acquires the information that the leakage of the refrigerant has been detected, the above-mentioned air blowing means provided in the indoor unit 1 directs the airflow indoors from the air outlet 112 toward the opening 20 selected by the above-mentioned selection means. to be generated. Then, as an airflow is generated indoors toward the opening 20 selected by the aforementioned selection means, the amount of exhaust air from the opening 20 increases. In other words, when the above-mentioned leakage information acquisition means acquires the information that the leakage of refrigerant has been detected, the above-mentioned air blowing means provided in the indoor unit 1 blows air from the air outlet 112 through the opening 20 selected by the above-mentioned selection means. Exhaust volume is generating increased airflow.

Here, the flow of the operation of the air conditioner in the operation example described above will be explained once again with reference to the flowchart of FIG. 11. First, in step S1, the leakage detection unit 51 determines whether the refrigerant leakage sensor 11 has detected a refrigerant concentration equal to or higher than the leakage determination reference value described above. If a refrigerant concentration equal to or higher than the leakage determination reference value is detected, the control unit 53 stops the operation of the compressor 7 in step S2.

After step S2, the operation of step S3 is performed. In step S3, the selection unit 54 selects one of the plurality of openings 20. After step S3, the operation of step S4 is performed. In step S4, the control unit 53 adjusts the air direction and air volume of the air blowing means of the indoor unit 1, operates the indoor fan 5, and blows air from the air outlet 112 toward the opening 20 selected by the selection unit 54 in step S3.

In subsequent step S5, the leak detection unit 51 determines whether the refrigerant leak sensor 11 detects a refrigerant concentration equal to or higher than the leak determination reference value. If the refrigerant concentration is still detected to be equal to or higher than the leakage determination reference value, the operation of the indoor fan 5 in step S4 is continued, and air continues to be blown from the outlet 112 toward the opening 20 selected by the selection unit 54. Then, when the refrigerant leakage sensor 11 no longer detects a refrigerant concentration equal to or higher than the leakage determination reference value, the control unit 53 stops the indoor fan 5 in step S6. This completes the series of operations.

Note that step S5 and step S6 do not necessarily have to be performed. That is, the operation in step S4 of blowing air from the air outlet 112 toward the opening 20 selected by the selection unit 54 may be continued until it is stopped by, for example, an operation by a maintenance person or the like.

In the above, a case has been described in which an airflow is generated indoors from the outlet 112 toward the opening 20 selected by the selection unit 54 when leakage of refrigerant indoors is detected. However, the selection unit 54 does not have to select the opening 20 to which the air from the air outlet 112 is directed from among the plurality of openings 20. That is, when leakage of refrigerant indoors is detected, the above-described air blowing means of the indoor unit 1 may generate an airflow indoors from the outlet 112 toward the predetermined opening 20. In this case, the air blowing means provided in the indoor unit 1 does not need to be able to change the direction of air blown from the air outlet 112. That is, in this case, the direction of the air blown from the air outlet 112 of the indoor unit 1 may be fixed in advance toward the specific opening 20. Further, the number of openings 20 communicating with the outside of the room does not need to be plural, and it is sufficient if there is at least one opening 20 .

As explained above, in the air conditioner which is the blower device in this embodiment, when the leakage information acquisition means acquires information that a refrigerant leak has been detected, the air blower of the indoor unit 1 blows the air. An airflow is generated in the room from the outlet 112 toward the opening 20 leading to the outside of the room. In other words, the blowing means described above generates an airflow that increases the amount of air being evacuated from the openings 20. For this reason, the leaked refrigerant 30 indoors is promoted to be discharged outdoors through the opening 20 to reduce the concentration of the leaked refrigerant 30 indoors, and the leaked refrigerant 30 stays indoors and the refrigerant concentration increases. can be suppressed.

At this time, the selection unit 54 selects the opening 20 to which the air from the outlet 112 is directed, so that leakage can be made more efficient from among the plurality of openings 20 depending on the stage and situation of refrigerant leakage. Ventilation can be performed by selecting an opening 20 through which the refrigerant 30 can be discharged. Therefore, it is possible to further promote the discharge of the leaked refrigerant 30 to the outside through the opening 20, and to further reduce the concentration of the leaked refrigerant 30 indoors.

Next, FIG. 7 shows a second example of the operation when detecting a refrigerant leak. Also in this example, the indoor unit 1 generates an airflow indoors from the outlet 112 toward the opening 20 leading to the outside of the room when a refrigerant leak indoors is detected. At this time, the above-mentioned air blowing means of the indoor unit 1 blows air downward from the air outlet 112 when the above-mentioned leakage information acquisition means acquires information indicating that refrigerant leakage has been detected. In the example shown in the figure, air is blown from the air outlet 112 toward the gap at the bottom of the door 24.

As mentioned above, the refrigerant flowing through the refrigerant circuit, a portion of which is present indoors, is heavier than air at atmospheric pressure. Therefore, the refrigerant leaking from the refrigerant circuit sinks vertically downward and stays near the floor surface of the room. Therefore, by blowing air downward from the outlet 112, the air can be efficiently applied to the leaked refrigerant 30 that has accumulated near the indoor floor surface, and the discharge of the indoor leaked refrigerant 30 to the outside through the opening 20 can be further promoted. . Therefore, it is possible to further reduce the concentration of the leaked refrigerant 30 indoors.

Next, a third example of the operation upon detection of refrigerant leakage will be described with reference to FIG. As described above, the air blowing means of the indoor unit 1 can independently change the air blowing directions on the left side and the right side from the air outlet 112 in the up-down direction and the left-right direction. Therefore, when a refrigerant leak indoors is detected, airflows directed from the blower outlet 112 toward each of the two openings 20 can be simultaneously generated indoors. In the example shown in the figure, air is simultaneously blown from the air outlet 112 toward the ventilation fan 22 and the two openings 20 in the gap at the bottom of the door 24.

In addition, although the case where the left side and the right side of the blower outlet 112 are separated and air can be blown in two directions at the same time has been described here, the air outlet 112 may be configured to be able to blow air in three or more directions at the same time. That is, when the aforementioned leakage information acquisition means acquires information that a refrigerant leak has been detected, the aforementioned air blowing means of the indoor unit 1 simultaneously sends airflow from the outlet 112 toward each of the two or more openings 20 into the room. generate. In other words, the above-mentioned air blowing means simultaneously generates airflow in the room with increasing exhaust volume from each of the two or more openings 20. By doing so, even if the leaked refrigerant 30 spreads over a wide range indoors, the leaked refrigerant 30 inside the room can be efficiently discharged to the outside through the opening 20.

Further, in this case, the selection unit 54 may select two or more openings 20 to which the airflow from the air outlet 112 is directed. Alternatively, some of the two or more openings 20 that direct the airflow from the air outlet 112 may be fixed to predetermined openings, and the remaining openings may be selected by the selection unit 54.

FIG. 9 shows a fourth example of the operation upon detection of refrigerant leakage. In the example shown in the figure, an opening/closing device 23a for opening and closing the window 23 is further provided. The opening/closing device 23a is provided so as to be able to communicate with, for example, a control unit 53 of an air conditioner that is a blower device. The communication method at this time may be a wireless method or a wired method. A ventilation system including an air conditioner, which is a ventilation device, and a switching device 23a is configured.

In this ventilation system, the control unit 53 to which the refrigerant leakage detection signal has been input transmits a control signal to the opening/closing device 23a. The opening/closing device 23a that has received the control signal from the control unit 53 opens the window 23. The control unit 53 then controls the air blowing means of the indoor unit 1 to blow air from the air outlet 112 toward the window 23 . By opening the window 23 with the opening/closing device 23a, the amount of air that can pass through the window 23 within a certain period of time, that is, the amount of exhaust air can be increased.

The opening/closing device 23a configured as described above is an example of an exhaust gas increasing unit that increases the amount of exhaust air from the window 23, which is the opening 20, when the leakage information acquisition unit acquires information that a refrigerant leak has been detected. . That is, the opening/closing device 23a serving as the exhaust gas increasing means increases the volume of exhaust gas from the window 23 by opening the closed window 23 or by increasing the degree of opening of the open window 23.

The ventilation fan 22a can also be used as an exhaust gas increasing means for increasing the amount of exhaust air from the ventilation fan 22, which is the opening 20. The ventilation fan 22a, which serves as an exhaust gas increasing means, increases the amount of exhaust air from the ventilation fan 22, which is the opening 20, by starting rotation from a stopped state, or by increasing the rotation speed if it is already rotating. Is possible. Note that when blowing air from the outlet 112 toward the opening 20 selected by the selection section 54, the exhaust gas increasing means may increase the exhaust amount of the opening 20 selected by the selection section 54.

As in this fourth example, when a refrigerant leak is detected indoors, the air blowing system is equipped with an exhaust increasing means that increases the amount of exhaust air from the opening 20, thereby reducing the amount of refrigerant leaking indoors through the opening 20. 30 can be further promoted. Further, it is possible to further reduce the concentration of the leaked refrigerant 30 indoors, and to prevent the leaked refrigerant 30 from staying indoors and increasing the refrigerant concentration.

Next, with reference to FIG. 10, a fifth example of the operation upon detection of refrigerant leakage will be described. In the examples described so far, there is only one blower device in the room. However, the number of air blowers in this embodiment is not limited to one, and two or more air blowers may be linked to generate airflow toward the opening 20 indoors. FIG. 10 shows an example in which there are two blowers. In the example shown in the figure, a second blower device 60 is further installed indoors.

The second blower device 60 is, for example, an air cleaner, an electric fan, a circulator, or the like. Moreover, the second air blower 60 may be an air conditioner having a refrigerant circuit. A second blower outlet 61 is formed in the second blower device 60 . The second air blower 60 includes a second air blower (not shown). The second blowing means is a means for blowing air into the room from the second outlet 61.

In contrast to the second blower 60, the air conditioner including the indoor unit 1 and the outdoor unit 2 described above corresponds to the first blower. Further, the air outlet 112 of the indoor unit 1 corresponds to a first air outlet. The indoor fan 5 of the indoor unit 1, the left front vertical wind direction plate 131, the right front vertical wind direction plate 132, the left rear vertical wind direction plate 141, the right rear side vertical wind direction plate 142, and the left and right wind direction plate 150 are the first ventilation means. corresponds to

Here, the position where the air outlet 112 of the indoor unit 1, which is the first air outlet, is arranged will be referred to as the first position. The air conditioner, which is the first blower, includes a first blower that sends air into the room from a first position to generate an airflow. Similarly, the position where the second air outlet 61 is arranged is called a second position. The second blower device 60 includes a second blower that sends air into the room from a second position to generate an airflow.

The second air blower 60 is provided so as to be able to communicate with, for example, a control unit 53 of an air conditioner that is the first air blower. The communication method at this time may be a wireless method or a wired method. A ventilation system including an air conditioner, which is a first ventilation device, and a second ventilation device 60 is configured.

In this ventilation system, the control unit 53 to which the refrigerant leakage detection signal has been input transmits a control signal to the second ventilation device 60, for example. The second blower device 60 that has received the control signal from the control unit 53 controls the second blower described above to blow air from the second outlet 61 . Further, at the same time, the control unit 53 controls the first air blowing means of the indoor unit 1 to blow air from the air outlet 112. At this time, the wind direction and air volume of the first air blowing means and the wind direction and air volume of the second air blowing means are such that the air flow toward the opening 20 leading to the outside of the room is It is adjusted so that it is generated. In the example shown in FIG. 10 , an airflow directed toward the ventilation fan 22 is generated indoors by the air blowing from the air outlet 112 and the second air outlet 61 .

The opening 20, which is the destination of the airflow generated in the room at this time, may be fixed in advance or may be selected by the selection unit 54. Furthermore, even if one or both of the wind direction of the first blowing means and the wind direction of the second blowing means do not directly face the opening 20, the wind is finally generated by blowing air simultaneously from the first blowing means and the second blowing means. It is sufficient that the airflow is directed toward the opening 20. One or both of the first blowing means and the second blowing means may not be able to change the wind direction. Furthermore, the ventilation system may include the exhaust gas increasing means described as the fourth example of the operation upon detection of refrigerant leakage.

The ventilation system according to the fifth example as described above includes a first ventilation device and a second ventilation device 60. When the leakage information acquisition means acquires the information that a refrigerant leak has been detected, the first ventilation means and the second ventilation means simultaneously blow air to direct the airflow toward the opening 20 leading to the outside of the room into the room. generate. Such a ventilation system can also facilitate the discharge of leaked refrigerant 30 from the room through the opening 20, as in the case where there is only one ventilation device in the room. Further, it is possible to further reduce the concentration of the leaked refrigerant 30 indoors, and to prevent the leaked refrigerant 30 from staying indoors and increasing the refrigerant concentration.

In addition, by linking two or more blowers, it is possible to send air to corners of a room where it is difficult to reach with a single blower. In particular, since the indoor unit 1 of the air conditioner is fixed indoors, it is easy to create areas where the air is difficult to reach depending on the installation location.By linking multiple air blowers together, blind spots for air can be reduced. . Therefore, it is possible to reduce the amount of leaked refrigerant 30 that remains indoors.

In any of the above operation examples, when the leakage detection section 51 outputs a refrigerant leakage detection signal, that is, when the leakage information acquisition means acquires information indicating that a refrigerant leakage has been detected, the notification section 55 It is preferable to inform users, workers, maintenance personnel, etc. of this fact and encourage them to carry out repairs. The notification unit 55 includes a speaker for notifying by sound or an LED for notifying by light that the occurrence of refrigerant leakage in the room has been detected. The notification unit 55 is provided, for example, in the casing 110 of the indoor unit 1, the remote control of the air conditioner, or the like.

1 Indoor unit 2 Outdoor unit 3 Indoor heat exchanger 4 Outdoor heat exchanger 5 Indoor fan 6 Outdoor fan 7 Compressor 8 Expansion valve 9 Four-way valve 10 Refrigerant piping 11 Refrigerant leak sensor 110 Housing 111 Suction port 112 Outlet port 113 Front panel 131 Left front vertical wind direction board 132 Right front vertical wind direction board 141 Left back vertical wind direction board 142 Right back vertical wind direction board 150 Left and right wind direction board 170 Infrared sensor 20 Opening 21 Air supply port 22 Ventilation fan 22a Ventilation fan 23 Window 23a Opening/closing device 24 Door 30 Leakage refrigerant 51 Leakage detection section 52 Storage section 53 Control section 54 Selection section 55 Notification section 60 Second blower device 61 Second outlet

Claims (10)

a blowing means for blowing air into the room to generate an air current;
Leakage information acquisition means for acquiring information regarding leakage of refrigerant in the room,
Part or all of a refrigerant circuit through which the refrigerant flows is present in the room or a space leading to the room,
When the leakage information acquisition means acquires information that a leakage of the refrigerant is detected, the ventilation means generates an airflow toward an opening leading to the outside of the room,
The blowing means can change the direction of the blowing air,
There are a plurality of openings leading to the outside in the room,
further comprising a selection means for selecting one of the plurality of openings when the leakage information acquisition means acquires information that a refrigerant leak has been detected;
The blowing means generates an airflow toward the opening selected by the selection means when the leakage information acquisition means acquires information that a refrigerant leak has been detected;
The selection means is a blower device that determines the opening to be selected depending on the elapsed time since the refrigerant leakage was detected . a blowing means for blowing air into the room to generate an air current;
Leakage information acquisition means for acquiring information regarding leakage of refrigerant in the room,
Part or all of a refrigerant circuit through which the refrigerant flows is present in the room or a space leading to the room,
When the leakage information acquisition means acquires information that a leakage of the refrigerant is detected, the ventilation means generates an airflow whose exhaust amount increases from an opening leading to the outside of the room,
The blowing means can change the direction of the blowing air,
There are a plurality of openings leading to the outside in the room,
further comprising a selection means for selecting one of the plurality of openings when the leakage information acquisition means acquires information that a refrigerant leak has been detected;
When the leakage information acquisition means acquires information that a refrigerant leak has been detected, the blower generates an airflow that increases the amount of exhaust from the opening selected by the selection means,
The selection means is a blower device that determines the opening to be selected depending on the elapsed time since refrigerant leakage was detected . The blower device according to claim 1 or 2 , further comprising a storage means for storing the positions of the plurality of openings in advance. The blower device according to claim 1 or 2 , further comprising an opening detection means for detecting the positions of the plurality of openings. The blower device according to any one of claims 1 to 4 , further comprising the refrigerant circuit. The refrigerant is heavier than air at atmospheric pressure,
The air blower blows air from the blower outlet to generate an air current, and when the leakage information acquisition means acquires information indicating that a refrigerant leak has been detected, the blower blows air downward from the blower outlet. The blower device according to any one of the items. 7. The refrigerant refrigerant according to claim 1, further comprising a notification means for notifying that a refrigerant leak has occurred when the leakage information acquisition means acquires information indicating that a refrigerant leak has been detected. Air blower. The blower device according to claim 1 ;
An air blowing system comprising: an exhaust increasing means for increasing the amount of exhaust air from the opening selected by the selecting means when the leakage information acquiring means acquires information indicating that leakage of the refrigerant has been detected. a first blower device having a first blower that sends air into the room from a first position to generate an airflow;
a second blowing device having a second blowing means for sending air into the room from a second position to generate an airflow;
Leakage information acquisition means for acquiring information regarding leakage of refrigerant in the room,
Part or all of a refrigerant circuit through which the refrigerant flows is present in the room or a space leading to the room,
The first air blower and the second air blower are configured to blow air simultaneously from the first air blower and the second air blower when the leakage information acquisition means acquires information that a refrigerant leak has been detected. generates airflow towards the opening leading to the outside of the
The first air blower and the second air blower can change the direction of the air they blow,
There are a plurality of openings leading to the outside in the room,
further comprising a selection means for selecting one of the plurality of openings when the leakage information acquisition means acquires information that a refrigerant leak has been detected;
When the leakage information acquisition means acquires information that a refrigerant leak has been detected, the first air blower and the second air blower simultaneously blow air from the first air blower and the second air blower. means generating an airflow towards the selected opening;
The selection means is a ventilation system that determines the opening to be selected depending on the elapsed time since the refrigerant leakage was detected . The blower system according to claim 9 , wherein one or both of the first blower and the second blower further includes the refrigerant circuit.

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