Patent Application
20250164131
The present disclosure relates to an air-conditioning system that controls air conditioning of a living room by an air conditioner installed in an air-conditioning room independent of the living room.
Accurate detection is required when a flammable refrigerant has leaked from an air conditioner. For example, the refrigerant is detected at an outlet of an indoor unit (air conditioner), and the refrigerant is also detected at a floor below the indoor unit. When a volume of gas of the refrigerant at the outlet and a volume of gas of the refrigerant at the floor exceed a specified volume, occurrence of refrigerant leakage is warned (see, for example, PTL 1).
PTL 1: Unexamined Japanese Patent Publication No. 2005-16822
In a central air-conditioning system, an air conditioner is installed in an air-conditioning room independent of a living room to be air-conditioned, and air-conditioning room air that is air in the air-conditioning room is air-conditioned by the air conditioner. The air-conditioning room air is sent to the living room through an air sending passage. Since the air-conditioning room is generally narrower than the living room, in a case where a refrigerant has leaked from the air conditioner, a refrigerant concentration contained in the air-conditioning room air is higher than a refrigerant concentration in a case where the refrigerant leaks from the air conditioner installed in the living room. It is required to accurately determine whether or not the refrigerant is leaking in the air-conditioning room.
Therefore, the present disclosure solves the above problem, and provides a technique of accurately determining whether or not the refrigerant is leaking and reducing an influence on the living room even in a case where the refrigerant has leaked.
An air-conditioning system according to an aspect of the present disclosure is an air-conditioning system that sends, to a living room, an air-conditioning room air of an air-conditioning room independent of the living room, the air-conditioning system including: an air conditioner installed in the air-conditioning room; a refrigerant concentration sensor that detects a concentration of a refrigerant contained in the air-conditioning room air in the air-conditioning room; a state changer that switches between a first state where the air-conditioning room air is sent to the living room and a second state where air coming in and out of the air-conditioning room is less than the air-conditioning room air in the first state; and a leakage determination unit that determines whether or not the refrigerant is leaking by acquiring the refrigerant concentration detected by the refrigerant concentration sensor in the second state. Further, an air-conditioning system according to an aspect of the present disclosure includes: an air conditioner installed in an air-conditioning room independent of a living room; a refrigerant concentration sensor that detects a concentration of a refrigerant contained in air-conditioning room air in the air-conditioning room; a branch chamber that branches an air-conditioning air passage from the air-conditioning room into an air sending passage for sending the air-conditioning room air to the living room and an air exhausting passage for exhausting the air-conditioning room air to outdoors; and a branch controller that controls the branch chamber based on the refrigerant concentration detected by the refrigerant concentration sensor.
Note that any combination of the above-described components and modifications of the expressions of the present disclosure among, for example, methods, devices, systems, recording media, and computer programs are also effective as aspects of the present disclosure.
According to the present disclosure, it is possible to accurately determine whether or not the refrigerant is leaking, and to reduce the influence on the living room even in the case where the refrigerant has leaked.
Before specifically describing an example of the present disclosure, an overview of the example will be described. The present example relates to an air-conditioning system that is disposed in a facility such as a house and executes central air conditioning for the facility. In the air-conditioning system, an air conditioner (indoor unit) is installed in an air-conditioning room independent of a living room to be air-conditioned, and the air-conditioning room is air-conditioned by the indoor unit. The air-conditioning room and the living room are connected by a duct, and air in the air-conditioning room (hereinafter, referred to as air-conditioning room air ”) is sent to the living room through the duct, whereby the living room is air-conditioned. If the refrigerant leaks from such indoor unit, the refrigerant is contained in the air-conditioning room air. As described above, since the air-conditioning room is generally narrower than the living room, a refrigerant concentration in a case where the refrigerant leaks from the air conditioner installed in the air-conditioning room is higher than a concentration of refrigerant in a case where the refrigerant leaks from the air conditioner installed in the living room.
In such air-conditioning system, it is required to accurately determine that the refrigerant is leaking and to reduce the influence on the living room even in the case where the refrigerant has leaked. In order to accurately determine that the refrigerant is leaking, the air-conditioning system according to the present example periodically stops an air blower for sending the air-conditioning room air to the living room, and detects the refrigerant concentration during the stop. Such refrigerant concentration is the refrigerant concentration in a state where the air-conditioning room air stays in the air-conditioning room, so that accuracy of the concentration detection is improved. If it is determined that the refrigerant is leaking based on the accurately detected concentration, accuracy of the determination is improved. Further, in order to reduce the influence on the living room even in the case where the refrigerant has leaked, the air-conditioning system according to the present example does not send the air-conditioning room air to the living room but exhausts the air-conditioning room air out of the facility.
The examples described below each indicate a preferred specific example of the present disclosure. Thus, numerical values, shapes, materials, components, arrangement positions and connection forms of the components, as well as steps (processes), orders of steps, and the like to be shown in the following examples are merely examples and are not to limit the scope of the present disclosure. Accordingly, among the components in the following examples, the components that are not described in independent claims representing a most superordinate concept of the present disclosure are described as optional components. Further, in each of drawings, substantially the same components are denoted by the same reference signs, and redundant descriptions thereof will be omitted or simplified. Hereinafter, the present example will be described in an order of (1) the overall configuration, (2) determination as to whether or not there is a refrigerant leakage, (3) damper control, and (4) a modification.
Outside air introduction duct 102, exhausting duct 106, air-conditioning duct 130, first air sending duct 150a and second air sending duct 150b collectively referred to as air sending ducts 150, air-conditioning exhaust duct 154, first circulation duct 162a and second circulation duct 162b collectively referred to as circulation ducts 162, circulation duct 164, as well as first air exhausting duct 172a and second air exhausting duct 172b collectively referred to as the exhaust ducts 172 are pipes, that is, air passages that send air.
Outside air introduction port 100 is disposed in an outer wall of the house. Outside air introduction duct 102 extends from outside air introduction port 100 toward an inner side of the house. Outside air introduction duct 102 is connected to ventilator 104. In ventilator 104, an outside air introduction fan (not illustrated) is installed, and air (outside air) is taken in from outside air introduction port 100 by rotation of the outside air introduction fan and flows into ventilator 104 through outside air introduction duct 102. Outside air introduction duct 102 further extends from ventilator 104, connected to circulation duct 164, and allows the air from ventilator 104 to flow into circulation duct 164.
Ventilator 104 is also connected to exhausting duct 106. Exhausting duct 106 is connected to first air exhausting duct 172a extending from first living room 10a and second air exhausting duct 172b extending from second living room 10b. Exhausting duct 106 extends toward the outer wall of the house via ventilator 104. First air exhausting duct 172a is also connected to first inlet 170a disposed in first living room 10a, and second air exhausting duct 172b is also connected to second inlet 170b disposed in second living room 10b. Further, exhausting duct 106 is also connected to exhaust port 108 disposed in the outer wall of the house.
In ventilator 104, an exhaust fan (not illustrated) is installed, and the air is taken in from first inlet 170a by rotation of the exhaust fan and flows into ventilator 104 through first air exhausting duct 172a and exhausting duct 106. Further, the air is taken in from second inlet 170b by the rotation of the exhaust fan, and flows into ventilator 104 through second air exhausting duct 172b and exhausting duct 106. Moreover, air (exhaust air) is exhausted from exhaust port 108 through exhausting duct 106. As described above, first air exhausting duct 172a, second air exhausting duct 172b, and exhausting duct 106 collect the air from first living room 10a and second living room 10b, and exhaust the air to outdoors from one exhaust port 108. As a result, first living room 10a and second living room 10b different from each other are ventilated by ventilator 104, and air inside and outside living rooms 10 is exchanged. In ventilator 104, heat exchange may be performed between the air (outside air) taken in from outside air introduction port 100 and the air (exhaust air) taken in from living rooms 10.
Installed inside the house are first circulation duct 162a, second circulation duct 162b, and circulation duct 164, all of which extend from each of living rooms 10 to air-conditioning room 20. Installed inside the house are air-conditioning duct 130, first air sending duct 150a, and second air sending duct 150b, all of which extend from air-conditioning room 20 to each of living rooms 10. First circulation duct 162a, second circulation duct 162b, and circulation duct 164 are also referred to as return air ducts, and air-conditioning duct 130, first air sending duct 150a, and second air sending duct 150b are also referred to as supply air ducts. The air passages connecting these ducts each have an annular shape.
Circulation duct 164 is connected to first circulation duct 162a extending from first living room 10a, second circulation duct 162b extending from second living room 10b, and outside air introduction duct 102. First circulation duct 162a is also connected to first circulation port 160a disposed in first living room 10a, and second circulation duct 162b is also connected to second circulation port 160b disposed in second living room 10b. In circulation duct 164, the air from first circulation duct 162a, the air from second circulation duct 162b, and the air from outside air introduction duct 102 are mixed. The mixed air flows toward air-conditioning room 20.
Air-conditioning duct 130 extending from air-conditioning room 20 is connected to branch chamber 140, and first air sending duct 150a, second air sending duct 150b, and air-conditioning exhaust duct 154 are connected to branch chamber 140. First air sending duct 150a is also connected to first outlet 152a disposed in first living room 10a, and second air sending duct 150b is also connected to second outlet 152b disposed in second living room 10b. Further, air-conditioning exhaust duct 154 is also connected to air-conditioning exhaust port 156 disposed in the outer wall of the house. Operations of branch chamber 140 and the flow of the air through branch chamber 140 will be described later.
In air-conditioning room 20, humidifier 120, indoor unit 122, air blower 126, and refrigerant concentration sensor 128 are installed. The air from circulation duct 164 flows into air-conditioning room 20. The air flowing into air-conditioning room 20 (air in air-conditioning room 20) corresponds to the “air-conditioning room air” described above. Humidifier 120 humidifies or dehumidifies the air-conditioning room air. Indoor unit 122 (air conditioner) is connected to outdoor unit 124 installed outside the facility, and cools or heats the air-conditioning room air. Air blower 126 blows the air-conditioning room air from air-conditioning room 20 to air-conditioning duct 130.
Humidifier 120, indoor unit 122, and air blower 126 have a wireless communication function or a wired communication function, and can communicate with control device 200. Humidifier 120 receive an instruction of humidification or dehumidification in humidifier 120 from control device 200. Indoor unit 122 receives an instruction of cooling or heating in indoor unit 122 from control device 200. Air blower 126 receives an instruction to blow the air in air blower 126 from control device 200. Humidifier 120, indoor unit 122, and air blower 126 operate in accordance with the instructions received from control device 200.
Refrigerant concentration sensor 128 detects a concentration of a refrigerant contained in the air-conditioning room air that is the air in air-conditioning room 20. It is sufficient to use a known technique to detect the refrigerant concentration in refrigerant concentration sensor 128, and therefore, a description thereof is omitted here. Refrigerant concentration sensor 128 has the wireless communication function or the wired communication function, and can communicate with control device 200. Refrigerant concentration sensor 128 transmits a value of the refrigerant concentration to control device 200.
Air-conditioning room 20 may include a filter. The filter is, for example, a high efficiency particulate air (HEPA) filter. The HEPA filter is an air filter that removes dirt, dust, and the like from the air-conditioning room air and outputs clean air-conditioning room air. The clean air-conditioning room air is blown by air blower 126.
Branch chamber 140 branches air-conditioning duct 130 from air-conditioning room 20 into first air sending duct 150a, second air sending duct 150b, and air-conditioning exhaust duct 154. Air sending ducts 150 are air passages for sending the air-conditioning room air to living rooms 10, and air-conditioning exhaust duct 154 is an air passage for exhausting the air-conditioning room air to the outdoors.
Branch chamber 140 includes first sending air volume regulation damper 142a, second sending air volume regulation damper 142b and exhausting air volume regulation damper 144, collectively referred to as sending air volume regulation dampers 142. First sending air volume regulation damper 142a is arranged at a portion of branch chamber 140 branching into first air sending duct 150a, and can open or close first air sending duct 150a. Second sending air volume regulation damper 142b is arranged at a portion of branch chamber 140 branching into second air sending duct 150b, and can open or close second air sending duct 150b. Exhausting air volume regulation damper 144 is arranged at a portion of branch chamber 140 branching into air-conditioning exhaust duct 154, and can open or close air-conditioning exhaust duct 154.
Branch chamber 140 has the wireless communication function or the wired communication function, and can communicate with control device 200. Branch chamber 140 receives, from control device 200, respective opening and closing instructions for first sending air volume regulation damper 142a, second sending air volume regulation damper 142b, and exhausting air volume regulation damper 144. Branch chamber 140 opens and closes each of first sending air volume regulation damper 142a, second sending air volume regulation damper 142b, and exhausting air volume regulation damper 144 in accordance with the received respective opening and closing instructions.
First sending air volume regulation damper 142a opens and closes to regulate the volume of the air-conditioning room air sent from first air sending duct 150a to first living room 10a. Second sending air volume regulation damper 142b opens and closes to regulate the volume of the air-conditioning room air sent from second air sending duct 150b to second living room 10b. Exhausting air volume regulation damper 144 opens and closes to regulate the volume of the air-conditioning room air exhausted from air-conditioning exhaust duct 154 to the outdoors. In a case where air-conditioning system 1000 executes central air conditioning, first sending air volume regulation damper 142a and second sending air volume regulation damper 142b are opened, and exhausting air volume regulation damper 144 is closed.
Control device 200 is a system controller that controls entire air-conditioning system 1000. Control device 200 has the wireless communication function or the wired communication function, and can communicate with humidifier 120, indoor unit 122, air blower 126, refrigerant concentration sensor 128, and branch chamber 140. Control device 200 executes that describing later (2) determination as to whether or not there is a refrigerant leakage and (3) damper control. In
As described above, in the case where air-conditioning system 1000 executes the central air conditioning, first sending air volume regulation damper 142a and second sending air volume regulation damper 142b are opened, and exhausting air volume regulation damper 144 is closed. Therefore, the air-conditioning room air in air-conditioning room 20 is blown out to first living room 10a and second living room 10b through air-conditioning duct 130, branch chamber 140, first air sending duct 150a, and second air sending duct 150b. The air in first living room 10a and second living room 10b is exhausted out of the facility through first air exhausting duct 172a, second air exhausting duct 172b, and exhausting duct 106. Further, the air in first living room 10a and second living room 10b is returned to air-conditioning room 20 through first circulation duct 162a, second circulation duct 162b, and circulation duct 164. At this time, the outside air flows into circulation duct 164 through outside air introduction duct 102.
By circulating the air in this manner, the air comes in and out of air-conditioning room 20. In other words, the air-conditioning room air is constantly exchanged without continuously staying in air-conditioning room 20. Therefore, even in a case where the refrigerant is contained in the air-conditioning room air due to the leakage of the refrigerant from indoor unit 122, the air-conditioning room air containing the refrigerant is also exchanged. In such situation, refrigerant concentration sensor 128 cannot accurately detect the refrigerant concentration contained in the air-conditioning room air. As a result, the accuracy of the determination of the refrigerant leakage also decreases.
In order to suppress the decrease in the accuracy of the determination of the refrigerant leakage, control device 200 executes the following process.
A cycle of switching between the first state and the second state is set by cycle setting unit 210. Here, the cycle is a timing at which the first state and the second state are repeatedly switched. State changer 212 switches between the first state and the second state based on the cycle set by cycle setting unit 210.
Returning to
Refrigerant concentration storage 216 stores a refrigerant concentration (hereinafter, referred to as an “initial concentration”) received from refrigerant concentration sensor 128 in a case where the state information received from state changer 212 has changed from the first state to the second state, that is, when the first state shifts to the second state.
Leakage determination unit 218 acquires the initial concentration stored in refrigerant concentration storage 216 in the second state. Further, leakage determination unit 218 receives the refrigerant concentration from refrigerant concentration sensor 128 at an end timing of the second state. Leakage determination unit 218 calculates a difference between the initial concentration and the refrigerant concentration received from refrigerant concentration sensor 128, and determines that the refrigerant is leaking in a case where the difference is greater than or equal to a threshold value. The case where the difference is greater than or equal to the threshold value corresponds to a case where the refrigerant concentration received from refrigerant concentration sensor 128 is greater than or equal to the threshold value.
Meanwhile, in a case where the difference is less than the threshold value in the second state, leakage determination unit 218 determines that the refrigerant is not leaking. The case where the difference is less than the threshold value corresponds to a case where the refrigerant concentration received from refrigerant concentration sensor 128 is less than the threshold value. In other words, leakage determination unit 218 determines whether or not the refrigerant is leaking in the second state. Leakage determination unit 218 outputs a determination result to branch controller 220 and abnormality notification unit 222.
A process of branch controller 220 that has received the determination result will be described later. Abnormality notification unit 222 receives the determination result from leakage determination unit 218. In a case where the determination result indicates a refrigerant leakage, abnormality notification unit 222 notifies terminal devices 300 of the refrigerant leakage (abnormality) by wireless communication. Terminal devices 300 is a wireless device, for example, a smartphone owned by a user of living rooms 10. When terminal devices 300 received the notification of the refrigerant leakage (abnormality) from control device 200, terminal devices 300 outputs the notification of the refrigerant leakage (abnormality) to a display. Terminal devices 300 may output the notification of the refrigerant leakage (abnormality) by a sound.
In a case where the state information received from state changer 212 indicates the second state, increased concentration calculator 214 receives the refrigerant concentration from refrigerant concentration sensor 128. Increased concentration calculator 214 calculates an amount of increase in the refrigerant concentration that has increased over predetermined time in the second state. The predetermined time is a period shorter than second period 402 in
In
Returning to
Meanwhile, in a case where the determination result indicates the refrigerant leakage, that is, in a case where the refrigerant concentration detected by refrigerant concentration sensor 128 is greater than or equal to the threshold value, branch controller 220 closes first sending air volume regulation damper 142a and second sending air volume regulation damper 142b, and opens exhausting air volume regulation damper 144. Accordingly, the air-conditioning room air from air-conditioning room 20 is exhausted to the outdoors from air-conditioning exhaust duct 154 through branch chamber 140. As a result, the air-conditioning room air containing the leaking refrigerant is exhausted. As described above, branch controller 220 controls branch chamber 140 based on the refrigerant concentration detected by refrigerant concentration sensor 128.
As described above, in the case where the determination result indicates the refrigerant leakage, abnormality notification unit 222 notifies terminal devices 300 of the refrigerant leakage (abnormality), and when receiving the notification of the refrigerant leakage (abnormality), terminal devices 300 outputs the notification of the refrigerant leakage (abnormality). Meanwhile, when receiving the notification of the refrigerant leakage (abnormality), terminal devices 300 outputs a notification that the air-conditioning room air is exhausted to the outdoors to the display. Terminal devices 300 may output the notification that the air-conditioning room air is exhausted to the outdoors by the sound.
The devices, the system, or a subject of the method of the present disclosure includes a computer. Execution of a program by this computer implements functions of the devices, the system, or the subject of the method of the present disclosure. The computer includes, as a main hardware configuration, a processor that operates in accordance with the program. A type of the processor is not limited as long as the processor can implement the functions by executing the program. The processor includes one or a plurality of electronic circuits having a semiconductor integrated circuit (IC) or a large scale integration (LSI). The plurality of electronic circuits may be integrated on one chip or may be disposed on a plurality of chips. The plurality of chips may be aggregated into one device or may be disposed in a plurality of devices. The program is recorded in a computer-readable non-transitory recording medium such as a read-only memory (ROM), an optical disk, or a hard disk drive. The program may be stored in advance in the recording medium, or may be supplied to the recording medium via a wide area communication network including the Internet or the like.
Operations of air-conditioning system 1000 having the above configuration will be described.
In a case where a difference (refrigerant concentration Y-refrigerant concentration X) between refrigerant concentration Y in the second state and refrigerant concentration X during the shift to the second state is greater than or equal to a threshold value (Y in S22), leakage determination unit 218 determines a refrigerant leakage, and branch controller 220 fully closes sending air volume regulation dampers 142 and regulates an opening degree of exhausting air volume regulation damper 144 (S24). Abnormality notification unit 222 notifies terminal devices 300 of start of the exhaust (S26). In a case where increased concentration Z is less than the specified value (Y in S18), or in a case where the difference (refrigerant concentration Y-refrigerant concentration X) between refrigerant concentration Y in the second state and refrigerant concentration X during the shift to the second state is not greater than or equal to the threshold value (N in S22), branch controller 220 fully closes exhausting air volume regulation damper 144 and regulates the opening degree of sending air volume regulation dampers 142 (S28). State changer 212 returns to the first state and allows air blower 126 to operate (S30).
According to the present example, the switching is made between the first state where the air-conditioning room air is sent to living rooms 10 and the second state where the air coming in and out of air-conditioning room 20 is less than the air-conditioning room air in the first state, and the refrigerant concentration detected by refrigerant concentration sensor 128 in the second state is acquired to determine whether or not the refrigerant is leaking. Therefore, the accuracy of the determination can be improved. Further, air blower 126 operates in the first state and air blower 126 stops in the second state, so that it is possible to regulate the air coming in and out of air-conditioning room 20. Further, the refrigerant concentration detected by refrigerant concentration sensor 128 during the shift from the first state to the second state is stored, and the stored refrigerant concentration is used for the determination, so that the accuracy of the determination can be improved.
In addition, the first state and the second state are switched based on the cycle set by cycle setting unit 210, and it is determined whether or not the refrigerant is leaking in the second state, so that it is possible to periodically determine whether or not the refrigerant is leaking. Further, in a case where the amount of increase in the refrigerant concentration that has increased over the predetermined time in the second state is less than the specified value, the switching to the first state is made even in the second state, so that the period of the second state can be shortened. The period of the second state is shortened, whereby the transport of the air-conditioning room air to the living rooms can be resumed at an early stage, and the user can stay comfortable. Moreover, in a case where it is determined that the refrigerant is leaking, terminal devices 300 is notified of the abnormality of the air-conditioning system, so that the user in living rooms 10 can be notified of the abnormality.
Further, air sending ducts 150 or air-conditioning exhaust duct 154 is selected by controlling branch chamber 140 based on the refrigerant concentration detected by refrigerant concentration sensor 128, so that the influence on living rooms 10 can be reduced even in the case of the refrigerant leakage. Further, in the case where the refrigerant concentration is less than the threshold value, the air-conditioning room air is sent from air sending ducts 150 to living rooms 10, and in the case where the refrigerant concentration is greater than or equal to the threshold value, the air-conditioning room air is exhausted from air-conditioning exhaust duct 154 to the outdoors. Therefore, the influence on living rooms 10 can be reduced even in the case of the refrigerant leakage.
In addition, air sending ducts 150 or air-conditioning exhaust duct 154 is selected by sending air volume regulation dampers 142 and exhausting air volume regulation damper 144, so that blowing destination of the air-conditioning room air can be reliably changed.
Further, air-conditioning exhaust duct 154 allows branch chamber 140 to communicate with ventilator 104, so that the air-conditioning room air can be exhausted from exhaust port 108. Moreover, in the case where it is determined that the refrigerant is leaking, terminal devices 300 is notified that the air-conditioning room air is exhausted to the outdoors, so that the user in living rooms 10 can be notified of the abnormality in exhausting the air-conditioning room air.
An overview of one aspect of the present disclosure is as follows.
Air-conditioning system (1000) that sends, to living room (10), air-conditioning room air being air in air-conditioning room (20) independent of living room (10), the air-conditioning system including:
Air-conditioning system (1000) according to Item 1-1, further including air blower (126) that allows the air-conditioning room air to be sent from air-conditioning room (20) to living room (10)
Air-conditioning system (1000) according to Item 1-1, further including refrigerant concentration storage (216) that stores the refrigerant concentration detected by refrigerant concentration sensor (128) during shift from the first state to the second state, in which
Air-conditioning system (1000) according to Item 1-1, further including cycle setting unit (210) that sets a cycle of the switching between the first state and the second state performed by the state changer,
Air-conditioning system (1000) according to Item 1-4, further including increased concentration calculator (214) that calculates an amount of increase in the refrigerant concentration that has increased over a predetermined period of time in the second state,
Air-conditioning system (1000) according to Item 1-1, further including abnormality notification unit (222) that notifies, of an abnormality of the air-conditioning system, terminal devices (300) owned by a user of living room (10) in a case where leakage determination unit (218) determines that the refrigerant is leaking as the anomaly.
Air-conditioning system (1000) including:
Air-conditioning system (1000) according to Item 2-1, in which
Air-conditioning system (1000) according to Item 2-2, in which branch chamber (140) includes:
Air-conditioning system (1000) according to Item 2-2, further including ventilator (104) that exhausts living room air being air in living room (10), in which air exhausting passage (154) allows branch chamber (140) to communicate with ventilator (104), and
Air-conditioning system (1000) according to Item 2-2, further including abnormality notification unit (222) that notifies, of an abnormality, terminal devices (300) owned by a user of living room (10),
Although the present disclosure has been described based on the examples, the present disclosure is not limited to the above examples in any way, and it can be easily inferred that various modifications and variations can be made without departing from the gist of the present disclosure.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2023-197477 | Nov 2023 | JP | national |
| 2023-197478 | Nov 2023 | JP | national |
