Air conditioner, detection device, refrigerant leak detection method, program, and storage medium

Abstract

The invention provides an air conditioner, a detection device, a refrigerant leak detection method, a program, and a storage medium capable of detecting rapid leakage of a flammable refrigerant. The air conditioner uses a flammable refrigerant. The air conditioner includes a refrigerant pipe in which a refrigerant flows, a pressure sensor, and a control unit. The pressure sensor is provided in the refrigerant piping and acquires pressure information relating to the pressure of the refrigerant in the refrigerant piping. The control unit acquires pressure information through the pressure sensor, determines whether a pressure change within a predetermined time is greater than a change threshold value based on the pressure information, and detects rapid leakage of the refrigerant based on the determination result.

Description

Technical Field

[0001] This disclosure relates to air conditioners, detection devices, refrigerant leak detection methods, procedures, and storage media. Background Technology

[0002] As described in Patent Document 1, prior art knows of techniques that use a refrigerant detection sensor disposed within the housing of an air conditioner to detect whether a flammable refrigerant is leaking from the air conditioner. This refrigerant detection sensor is a gas sensor that detects the presence of a specific type of refrigerant.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent No. 6065962 Specification Summary of the Invention

[0006] The problem that the invention aims to solve

[0007] However, existing air conditioners can only detect whether there is a refrigerant leak. Therefore, current technology has the problem of not being able to detect the leak rate, especially rapid leaks.

[0008] The purpose of this disclosure is to provide an air conditioner, detection device, refrigerant leak detection method, procedure, and storage medium capable of detecting rapid leaks of flammable refrigerants.

[0009] Methods for solving problems

[0010] To address the aforementioned issues, this disclosure provides an air conditioner, a detection device, a refrigerant leak detection method, a procedure, and a storage medium.

[0011] One aspect of this disclosure discloses an air conditioner that uses a flammable refrigerant. The air conditioner includes a refrigerant piping through which the refrigerant flows, a pressure sensor, and a control unit. The pressure sensor is disposed on the refrigerant piping and acquires pressure information correlated with the pressure of the refrigerant within the piping. The control unit acquires the pressure information from the pressure sensor, determines based on the pressure information whether a pressure change within a specified time exceeds a change threshold, and detects rapid refrigerant leakage based on the determination result.

[0012] One aspect of the present disclosure provides a detection device for detecting refrigerant leakage in an air conditioner. The detection device includes a communication unit and a control unit. The communication unit acquires pressure information associated with the pressure of the refrigerant flowing within the refrigerant piping of the air conditioner. The control unit determines, based on the pressure information, whether the pressure change within a specified time exceeds a change threshold, and detects rapid refrigerant leakage based on the determination result.

[0013] One aspect of this disclosure provides a refrigerant leak detection method for detecting refrigerant leaks in an air conditioner, which can be implemented by the air conditioner itself. The refrigerant leak detection method includes: acquiring pressure information associated with the pressure of the refrigerant flowing within the refrigerant piping via a pressure sensor installed on the refrigerant piping of the air conditioner; determining, based on the pressure information, whether a pressure change within a specified time exceeds a change threshold; and detecting a rapid refrigerant leak based on the determination result.

[0014] One aspect of this disclosure provides a refrigerant leak detection method for detecting refrigerant leaks in an air conditioner, which can be implemented by a detection device. The refrigerant leak detection method includes: acquiring pressure information associated with the pressure of refrigerant flowing within the refrigerant piping of the air conditioner; determining, based on the pressure information, whether a pressure change within a specified time period exceeds a change threshold; and detecting a rapid refrigerant leak based on the determination result.

[0015] Other methods of procedure disclosed herein enable an air conditioner to perform a refrigerant leak detection method, or enable a detection device to perform a refrigerant leak detection method.

[0016] Alternatively, another embodiment of this disclosure uses a non-volatile, computer-readable storage medium storing a computer program. When the processor executes the computer program, a refrigerant leak detection method is implemented.

[0017] Invention Effects

[0018] In this disclosure, based on an air conditioner, a detection device, a refrigerant leak detection method, a procedure, and a storage medium, it is possible to detect rapid leaks of flammable refrigerants. Attached Figure Description

[0019] Figure 1 This is a block diagram illustrating a schematic structure of an air conditioner in Embodiment 1.

[0020] Figure 2 This is a schematic diagram of the refrigeration cycle in Implementation Method 1.

[0021] Figure 3 This is a flowchart of an example refrigerant leak detection method in Implementation Method 1.

[0022] Figure 4A This is a schematic diagram of the pressure changes of the refrigerant under normal conditions.

[0023] Figure 4B It is a schematic diagram of the pressure changes of the refrigerant when a rapid leak occurs.

[0024] Figure 5 This is a flowchart of another refrigerant leak detection method in Implementation Method 1.

[0025] Figure 6 This is a schematic diagram of the refrigeration cycle in Implementation Method 1.

[0026] Figure 7 This is a flowchart of an example of a refrigerant leak detection method in Implementation Method 2.

[0027] Figure 8 It is a schematic diagram of the pressure changes of the refrigerant when a minor leak occurs.

[0028] Figure 9 This is a flowchart of an example of a refrigerant leak detection method in Implementation Method 3.

[0029] Figure 10A This is a block diagram illustrating a schematic structure of the detection device in Embodiment 4.

[0030] Figure 10B This is a block diagram illustrating another example of the schematic structure of the detection device in Embodiment 4.

[0031] Figure 11 This is a flowchart of an example of a refrigerant leak detection method in Implementation Method 4. Detailed Implementation

[0032] [Technical Concept]

[0033] Before describing specific embodiments of the air conditioner, detection device, refrigerant leak detection method, procedure, and storage medium disclosed herein, an example will first be used to illustrate the technical concepts described in this disclosure. In this example, the air conditioner uses a flammable refrigerant (i.e., a combustible refrigerant) to perform its air conditioning function.

[0034] In recent years, based on the perspective of preventing global warming, there has been a demand for refrigerants with low global warming coefficients (GWP). Refrigerants with low GWP, such as propane (R290), are being researched. Because refrigerants like propane are flammable, there is a fire hazard if they leak from refrigerant piping. In the case of a rapid refrigerant leak, a large flammable area can easily form in a short time compared to a slower leak. Therefore, the probability of fire increases significantly if a rapid leak of flammable refrigerant occurs.

[0035] The main concept of this refrigerant leak detection method is to detect rapid leaks of flammable refrigerant in an air conditioner. A rapid refrigerant leak, as defined in this disclosure, refers to a leak occurring at a rate exceeding a specified value. This refrigerant leak detection method determines whether a rapid leak is occurring based on pressure changes in the refrigerant flowing within the refrigerant piping of the air conditioner. For example, a rapid leak can be detected when a pressure sensor determines a rapid drop in the pressure of the refrigerant gas within the refrigerant piping. Because of the technology disclosed herein, rapid leaks can be detected, and appropriate countermeasures can be implemented in response to the detection of a rapid refrigerant leak.

[0036] This refrigerant leak detection method can be implemented by an air conditioner. Alternatively, it can also be implemented using a non-air conditioner detection device, such as a server or terminal device that is connected to the air conditioner in communication.

[0037] The embodiments described below represent examples of this disclosure. The numerical values, shapes, structures, steps, and order of steps shown in the following embodiments are examples and are not intended to limit this disclosure. In the constituent elements of the following Embodiment 1, constituent elements not described in the independent claim representing the highest-level concept are described as arbitrary constituent elements.

[0038] In the embodiments described below, specific elements sometimes represent variations, while other elements include appropriate combinations of arbitrary structures, each exerting its own effect within the combined structure. In these embodiments, the effects of each variation are achieved by combining the structures of each variation separately.

[0039] In the following detailed description, terms such as “first” and “second” are used for illustrative purposes only and should not be construed as explicitly indicating or implying a relative importance or order of technical features. Features defined as “first” and “second” expressly or imply that one or more of those features are included.

[0040]

Implementation Method 1

[0041] Hereinafter, with appropriate reference to the accompanying drawings, a detailed description of Embodiment 1 of the air conditioner, detection device, refrigerant leak detection method, procedure, and storage medium of this disclosure will be provided. The air conditioner uses a specific internal space as the object of air conditioning control (hereinafter referred to as the control space) and regulates the air within the control space.

[0042] Figure 1 This is a block diagram illustrating a schematic structure of an air conditioner 10 in Embodiment 1. The air conditioner 10 implements a refrigerant leak detection method, enabling it to detect rapid refrigerant leaks.

[0043] exist Figure 1In one embodiment, the air conditioner 10 includes a storage unit 11, a communication unit 12, a control unit 13, a notification unit 14, a pressure sensor 15, and a refrigeration cycle 20. The refrigeration cycle 20 includes a refrigerant piping 21, a compressor 22, an expansion valve 23, a four-way valve 24, an indoor heat exchanger 25, and an outdoor heat exchanger 26. Alternatively, an air conditioner 10 that can only operate one of the cooling or heating cycles may not include the four-way valve 24.

[0044] A flammable refrigerant flows within the refrigerant piping 21, and the direction of refrigerant flow varies depending on the operating mode of the air conditioner 10 (cooling mode or heating mode). Examples of flammable refrigerants include R-290, R-32, R-1234yf, R-1234ze, R-600a, R-1270, and R-717.

[0045] The air conditioner 10 can be connected to the terminal device 60 and / or the server 50 via the communication unit 12. For example, the air conditioner 10 can also be connected to the terminal device 60, which serves as the remote control for the air conditioner 10, via infrared. The air conditioner 10 can also be connected to the terminal device 60, which serves as the user's smartphone, via the Internet. In addition, the air conditioner 10 can also be connected to the server 50 via the Internet.

[0046] The following is an overview of each component.

[0047] <Air Conditioner 10>

[0048] Air conditioner 10, for example, uses the interior space of a room in a home or office as the control space for air conditioning control. Figure 1 The air conditioner 10 shown includes an indoor unit 30 installed on the wall or ceiling of the control space and an outdoor unit 40 installed outdoors, in a central air-conditioned room or other location outside the control space. The air conditioner 10 has, for example, cooling, heating, dehumidification, and / or air purification functions. Alternatively, a stationary air conditioner 10 may not include an outdoor unit 40. Components other than the piping between the indoor unit 30 and the outdoor unit 40, such as the control unit 13 and the compressor 22, can be housed within the casing of either the indoor unit 30 or the outdoor unit 40.

[0049] <Storage Department 11>

[0050] Storage unit 11 is a recording medium for recording various information and control programs, and may also be a memory that functions as the working area of ​​control unit 13. Storage unit 11 is implemented, for example, by flash memory, RAM (Random Access Memory), ROM (Read Only Memory), other storage devices, or suitable combinations thereof.

[0051] The storage unit 11 can store references and thresholds for detecting refrigerant leaks, such as a threshold for detecting whether refrigerant is leaking rapidly. Information acquired by various sensors, such as the pressure sensor 15, can be stored in the storage unit 11. Information acquired from the terminal device 60 or the server 50 can also be stored in the storage unit 11. This information can be read into the control unit 13 when performing the refrigerant leak detection method.

[0052] The storage unit 11 may also store a computer program (sometimes simply referred to as a program in this disclosure) for enabling the air conditioner 10 to perform a refrigerant leak detection method. Additionally, the storage unit 11 may also include a non-volatile computer-readable storage medium storing the computer program.

[0053] <Communication Department 12>

[0054] The communication unit 12 can also communicate with the server 50, the user's terminal device 60, etc., for example, it can send and receive IP packets. As described above, the control unit 13 can also work in conjunction with the server 50 and / or the terminal device 60 via the communication unit 12. The communication unit 12 can also communicate between the air conditioner 10 and the terminal device 60, the server 50, or the external information source 90, according to standards such as Wi-Fi (registered trademark), IEEE 802.2, IEEE 802.3, 3G, LTE, intranet, extranet, LAN, ISDN, VAN, CATV communication network, virtual private network, telephone line network, mobile communication network, satellite communication network, infrared, Bluetooth (registered trademark), etc., to send and receive data.

[0055] <Control Department 13>

[0056] The control unit 13 is a controller that controls at least some of the functions of the air conditioner 10. The control unit 13 includes a general-purpose processor such as a CPU, MPU, MCU, FPGA, DSP, or ASIC that executes programs to implement the specified functions. By calling and executing the control program stored in the storage unit 11, the control unit 13 can implement various controls within the air conditioner 10. Furthermore, the control unit 13 works in conjunction with the storage unit 11 to read / write data stored in the storage unit 11. The control unit 13 is not limited to implementing the specified functions through the coordinated operation of hardware and software; it can also be a hardware circuit specifically designed to implement the specified functions.

[0057] The control unit 13 can receive various commands and settings from the user via the communication unit 12 from the terminal device 60. Based on these settings and detection values ​​received from various sensors (such as indoor humidity and outdoor humidity), the control unit 13 controls the various components of the air conditioner 10 to perform the air conditioning function of the air conditioner 10. In addition, the control unit 13 detects rapid refrigerant leakage in the air conditioner 10 based on the refrigerant leakage detection method described later.

[0058] <Prompt Section 14>

[0059] The prompting unit 14 is used to provide prompts in the form of at least one of numerical values, characters, images, and sounds. The prompting unit 14 may also include a display for presenting a graphical user interface (GUI), a speaker for presenting sound, or a buzzer. The air conditioner 10 may also output an alarm or notification via the prompting unit 14 in response to the detection of a refrigerant leak, for example. Alternatively, the air conditioner 10 may not include the prompting unit 14 if the alarm or notification is output via the terminal device 60, or if the alarm or notification is output to the server 50.

[0060] <Pressure Sensor 15>

[0061] The air conditioner 10 includes at least one pressure sensor 15. The pressure sensor 15 is a sensor used to acquire pressure information associated with the pressure of the refrigerant within the refrigerant piping 21. For example, the pressure sensor 15 can detect the absolute pressure, metered pressure, or pressure changes within the refrigerant piping 21 and output the detected information as pressure information.

[0062] The pressure sensor 15 can be configured inside or outside the refrigerant piping 21, or partially within it. The pressure sensor 15 can be configured on the indoor unit 30 or the outdoor unit 40. The detection result of the pressure sensor 15 varies depending on its location within the refrigerant piping 21. The pressure sensor 15 is essentially configured to acquire pressure information correlated with the pressure of the gaseous refrigerant (i.e., refrigerant gas) within the refrigerant piping 21. Alternatively, multiple pressure sensors 15 can be installed at various locations within the refrigerant piping 21 for faster or more accurate leak detection.

[0063] Figure 2 This is a schematic diagram of the refrigeration cycle 20 in Embodiment 1. Figure 2 Examples of the configuration positions (p1~p4) of the pressure sensor 15 are shown, indicating the components of the air conditioner 10 related to the refrigeration cycle 20 and indicated by black circles.

[0064] In one embodiment, the pressure sensor 15 is disposed within the outdoor unit 40. For example, disposed in... Figure 2 The configuration position p1 is shown. When the pressure sensor 15 is installed inside the outdoor unit 40, it is easy to install the pressure sensor 15 when manufacturing air conditioners 10, etc.

[0065] In one embodiment, the pressure sensor 15 is disposed in a portion of the refrigerant piping 21 located within the indoor unit 30. For example, the pressure sensor 15 could be located in... Figure 2 The configuration positions are p2 and p3, as shown. Generally, even if a leak occurs outdoors, the leaked refrigerant will be diluted by the air, so the danger is relatively low. Therefore, it is more common to detect indoor leaks, which pose a higher risk. When the pressure sensor 15 is configured in the indoor unit 30, the sensitivity of leak detection is high because the pressure information is acquired close to the desired leak location (i.e., indoors).

[0066] In one embodiment, the pressure sensor 15 is disposed in a portion of the refrigerant piping 21 located within the indoor unit 30 and between the indoor heat exchanger 25 and the compressor 22. For example, the pressure sensor 15 can be configured in... Figure 2 The pressure sensor 15, located at position p3, is capable of acquiring the pressure information of the gaseous refrigerant, regardless of whether the refrigeration cycle 20 is in a cooling or heating cycle. Alternatively, the pressure sensor 15 may be located within the refrigerant piping 21, inside the outdoor unit 40, between the indoor heat exchanger 25 and the compressor 22. This location, though within the outdoor unit 40, allows for the acquisition of gaseous refrigerant pressure information.

[0067] In one embodiment, the pressure sensor 15 is disposed in the refrigerant piping 21 near the compressor 22. For example, the pressure sensor 15 can be disposed in... Figure 2 The configuration is shown at position p4. Even during cooling or heating cycles, there are differences in pressure and temperature between the upstream and downstream sides of compressor 22, but the refrigerant is essentially in a gaseous state near compressor 22. Therefore, pressure sensor 15, located near compressor 22, can acquire pressure information of the gaseous refrigerant.

[0068] The air conditioner 10 may also include sensors for acquiring various information from the outside of the air conditioner 10 to perform its functions. For example, the air conditioner 10 may also include an indoor temperature sensor for detecting the temperature of indoor air drawn into the indoor unit 30 from the control space, and an outdoor air temperature sensor for detecting the temperature of outdoor air in the control space.

[0069] These sensors, including pressure sensor 15, enable the acquisition of information for implementing refrigerant leak detection and air conditioning functions. The information detected by the sensors is stored in storage unit 11 and then used by control unit 13 or sent to terminal device 60 or server 50.

[0070] <Indoor unit 30 and outdoor unit 40>

[0071] exist Figure 1 In one embodiment, the air conditioner 10 includes an indoor unit 30 and an outdoor unit 40. The indoor unit 30 includes an indoor fan 31, and the outdoor unit 40 includes an outdoor fan 41. As an example, the storage unit 11, the communication unit 12, the control unit 13, and the indoor heat exchanger 25 can be disposed within the housing of the indoor unit 30, and the compressor 22, the expansion valve 23, the four-way valve 24, and the outdoor heat exchanger 26 can be disposed within the housing of the outdoor unit 40.

[0072] <Server 50>

[0073] Server 50 may also be, for example, a management server of the manufacturer of at least one air conditioner 10 or an air conditioner 10 for collecting data. Alternatively, server 50 may be an application server. Server 50 can obtain detection results related to refrigerant leaks from air conditioner 10 via the Internet, information detected by at least one sensor of air conditioner 10, or transmit them to terminal device 60. In addition, server 50 can work in conjunction with air conditioner 10 and / or terminal device 60 to perform response measures based on leak detection.

[0074] <Terminal Device 60>

[0075] Terminal device 60 is a device associated with air conditioner 10. Terminal device 60 can be, for example, a controller for air conditioner 10, or a controller capable of managing and controlling various home appliances. In addition, terminal device 60 can also be an information terminal capable of data communication with air conditioner 10, such as a smartphone, mobile phone, tablet computer, wearable device, computer, etc., with a built-in dedicated associated application 61.

[0076] The control unit 13 or server 50 of the air conditioner 10 can acquire user-input settings or commands via the terminal device 60. The terminal device 60 can obtain detection results related to refrigerant leakage, or information detected by at least one sensor of the air conditioner 10, from the air conditioner 10 or server 50 via the Internet. Furthermore, the terminal device 60 can coordinate with the air conditioner 10 and / or server 50 to execute countermeasures based on leak detection. For example, if the terminal device 60 includes a notification unit containing a display, speaker, etc., the terminal device 60 can notify the user of a rapid refrigerant leak via the notification unit in response to the detection of a rapid leak.

[0077] <Refrigerant Leakage Detection Methods>

[0078] The air conditioner 10 implements a refrigerant leak detection method. More specifically, the control unit 13 of the air conditioner 10 works in conjunction with the storage unit 11 and the pressure sensor 15 to implement the refrigerant leak detection method. According to this refrigerant leak detection method, rapid refrigerant leakage can be detected. Furthermore, appropriate countermeasures can be executed in response to the detection of rapid refrigerant leakage.

[0079] Figure 3 This is a flowchart of the refrigerant leak detection method in Implementation Method 1. Figure 3 The refrigerant leak detection method shown includes steps S110 to S130. In one embodiment, the control unit 13 of the air conditioner 10 can also periodically implement the refrigerant leak detection method. The control unit 13 can implement the refrigerant leak detection method regardless of whether the air conditioner 10 is operating.

[0080] In the refrigerant leak detection method, the control unit 13 of the air conditioner 10 acquires pressure information related to the pressure of the refrigerant in the refrigerant piping 21 via the pressure sensor 15 (step S110). The period for the control unit 13 to acquire the pressure information via the pressure sensor 15 can be, for example, 3 minutes, 60 seconds, 30 seconds, 15 seconds, 10 seconds, 5 seconds, 3 seconds, 1 second, or less than 1 second.

[0081] Next, based on the pressure information acquired in step S110, the control unit 13 determines whether the pressure change within a specified time exceeds a change threshold (step S120). Based on the determination result, the control unit 13 detects a rapid refrigerant leak (step S130). The specified time in step S120 can be any time longer than the pressure information acquisition cycle. For example, the specified time can be 5 minutes, 3 minutes, 60 seconds, less than 30 seconds, 15 seconds, 10 seconds, 5 seconds, 3 seconds, 1 second, or less than 1 second. This specified time can also be the implementation cycle of the refrigerant leak detection method. Alternatively, for rapid response, the specified time can be less than 30 seconds.

[0082] More specifically, the control unit 13 determines, based on pressure information, how much the pressure of the refrigerant in the refrigerant piping 21 has increased or decreased within a specified time. In the case of a pressure decrease, the control unit 13 determines whether the decrease exceeds a change threshold. That is, the change threshold is a threshold relative to the amount of pressure decrease of the refrigerant per unit time. If the refrigerant pressure decreases significantly below the change threshold within the specified time, the control unit 13 determines that the refrigerant is leaking rapidly and detects a rapid refrigerant leak. On the other hand, if the control unit determines that the refrigerant pressure has increased or decreased by an amount below the change threshold within the specified time, the control unit 13 determines that the refrigerant is not leaking rapidly.

[0083] In one embodiment, the variation threshold is set taking into account the possibility of fire due to refrigerant leakage. As mentioned above, when the refrigerant leakage rate is high, a larger flammable area is more likely to form in a short time compared to when the leakage rate is low.

[0084] The variation threshold can be set based on experimental results (simulation results) related to refrigerant leakage and ignition. For example, the variation threshold can be set based on experimental results related to the leakage rate and the likelihood of ignition of the refrigerant. As an example, the variation threshold for refrigerant R290 is set based on leakage rates of 10 kg / h or higher, 7.5 kg / h or higher, or 5 kg / h.

[0085] Besides the leakage rate, several other factors influence the likelihood of ignition. For example, different types of refrigerants have different auto-ignition temperatures and lower flammability limits (LFLs), resulting in varying ignition probabilities during normal use. The LFL is the minimum concentration of refrigerant required to propagate a flame while maintaining a homogeneous mixture of refrigerant and air. At lower LFLs, even a slower leakage rate can easily create a flammable zone, thus increasing the likelihood of ignition. Therefore, the variation threshold can also be set based on the type of refrigerant.

[0086] Furthermore, since the internal volume of the refrigerant piping 21 and the amount of refrigerant supplied to the air conditioner 10 can affect the leakage rate, this can be taken into account when setting the variation threshold. In one embodiment, the variation threshold can be set based on at least one of the type of refrigerant, the internal volume of the refrigerant piping 21, and the amount of refrigerant supplied to the air conditioner 10. As an example, the variation threshold is set as the pressure drop per unit time corresponding to a specific leakage rate (e.g., 7.5 kg / h).

[0087] In one embodiment, the control unit 13 can determine the type of refrigerant used in the air conditioner 10, the internal volume of the refrigerant piping 21, and the amount of refrigerant injected, based on the model or identification information of the air conditioner 10 (hereinafter referred to as identification information, etc.). In this case, the control unit 13 can determine the identification information of the air conditioner 10 and obtain a change threshold associated with the identification information of the air conditioner 10. In one example, the change threshold associated with the air conditioner 10 is stored in the storage unit 11, and the control unit 13 obtains the change threshold by reading the change threshold from the storage unit 11. In another example, the control unit 13 queries the server 50 using the identification information of the air conditioner 10 via the communication unit 12, thereby obtaining the change threshold from the server 50. The control unit 13 uses the change threshold corresponding to the identification information, etc., to implement a refrigerant leak detection method.

[0088] The following uses Figure 4A and Figure 4B This describes the pressure changes of the refrigerant during a rapid leak. Figure 4A This is a schematic diagram of the pressure changes of the refrigerant under normal conditions. Figure 4B It is a schematic diagram of the pressure changes of the refrigerant when a rapid leak occurs.

[0089] Because the saturation temperature of the refrigerant varies with the ambient temperature, the pressure of the refrigerant gas also varies slightly with changes in indoor and outdoor air temperatures. Therefore, as... Figure 4A As shown, during normal operation, the pressure of the refrigerant gas rises or falls slowly within a certain range. For example, when the refrigerant is R-290, the pressure typically varies slowly within the range of approximately 1.2 MPa to 0.5 MPa.

[0090] On the other hand, experiments show that in the event of rapid refrigerant leakage, the pressure of the refrigerant gas drops rapidly. Figure 4B During period D1, due to the rapid refrigerant leak, the refrigerant gas pressure drops rapidly within a short time. During period D2, liquid refrigerant evaporates to replenish the refrigerant gas, restoring pressure equilibrium. During period D3, the refrigerant temperature decreases due to the latent heat of vaporization, and the refrigerant gas pressure gradually decreases further.

[0091] Therefore, the refrigerant leak detection method and air conditioner 10 described above can detect rapid refrigerant leaks by detecting a rapid drop in the pressure of the refrigerant in the refrigerant piping 21.

[0092] Figure 5 This is a flowchart of another refrigerant leak detection method in Implementation Method 1. Figure 5 The refrigerant leak detection method shown includes steps S110 to S140. Figure 5 Steps S110~S130 in the middle and Figure 3 The steps S110 to S130 are the same, so detailed information is omitted here.

[0093] exist Figure 5 In the refrigerant leak detection method shown, after detecting a rapid refrigerant leak, the control unit 13 also responds by executing a first countermeasure (step S140). The air conditioner 10 can implement the first countermeasure independently or in conjunction with the server 50 and / or the terminal device 60.

[0094] In one embodiment, the first response includes outputting a notification or alarm indicating at least one of a rapid leak detected and recommending evacuation. The control unit 13 may also output the notification or alarm via the prompting unit 14 of the air conditioner 10 or the terminal device 60 to notify the user of the rapid leak. In one example, the control unit 13 outputs an audible message conveying "Refrigerant leak, please evacuate immediately" via the speaker of the prompting unit 14. In another example, the control unit 13 outputs a notification indicating a rapid leak detected to the terminal device 60 via the communication unit 12, thereby notifying users outside the control range of the air conditioner 10. In yet another example, the control unit 13 sends a notification to the server 50 via the communication unit 12, and the server 50 forwards the received notification to the management company of the air conditioner 10 or the manager of the building where the air conditioner 10 is installed.

[0095] In one embodiment, the air conditioner 10 includes at least one shut-off valve 17 disposed on the refrigerant piping 21. In this embodiment, the first response includes actuating the shut-off valve 17 to cut off the flow of refrigerant in the refrigerant piping 21.

[0096] Figure 6 This is a schematic diagram of the refrigeration cycle 20 of Embodiment 1. Figure 6 Examples of the configuration positions of the shut-off valve 17 (positions p5-p7) are shown, indicating the components related to the refrigeration cycle 20 in the air conditioner 10 and represented by black triangles. The shut-off valve 17 cuts off the flow of refrigerant in the refrigerant piping 21. For example, the shut-off valve 17 can cut off the flow of refrigerant to the indoor unit 30 or to the outdoor unit 40, resulting in the complete interruption of the refrigerant flow.

[0097] like Figure 6As shown, the shut-off valve 17 can be configured on the indoor unit 30 (configuration position p5), on the outdoor unit 40 (configuration positions p7 and p8), or between the indoor unit 30 and the outdoor unit 40 (configuration position p6). Alternatively, the shut-off valve 17 can also be configured near the compressor 22 (e.g., configuration positions p6 and p7). Furthermore, the shut-off valve 17 can also be configured on the outside of the housing of the indoor unit 30 or the outdoor unit 40 to facilitate inspection by personnel in case of leaks or other issues.

[0098] In one embodiment, the first countermeasure includes activating the indoor fan 31 of the indoor unit 30. The control unit 13 operates the indoor fan 31 to agitate the refrigerant gas and disperse it in the indoor air to prevent the formation of a flammable zone caused by leaked refrigerant gas. That is, the control unit 13 reduces the concentration of leaked refrigerant by operating the indoor fan 31, thus preventing fire.

[0099] Additionally, the control unit 13 can also implement multiple first response measures in response to the detection of a rapid leak. In one embodiment, the control unit 13 selects a suitable first response measure based on the state of the refrigerant leak or the amount of refrigerant reduction. For example, a lookup table of leak states or refrigerant reduction amounts and corresponding first response measures is stored in the storage unit 11. The control unit 13 compares the determined leak state or detected refrigerant reduction amount with the lookup table to determine the first response measure to be implemented.

[0100] According to the refrigerant leak detection method and the air conditioner 10 described above, rapid leaks of flammable refrigerants can be detected. Furthermore, since appropriate first-response measures can be implemented in response to the detection of rapid leaks, safety regarding the use of flammable refrigerants can be improved.

[0101] Thus, the control unit 13 of the air conditioner 10 completes the rapid handling of refrigerant leakage detection. The control unit 13 can also periodically repeat steps S110 to S130.

[0102] In one embodiment, the air conditioner 10 includes a program for implementing the refrigerant leak detection method described above. This program causes the control unit 13 of the air conditioner 10 to implement the refrigerant leak detection method.

[0103] In one embodiment, the air conditioner 10 has a non-volatile computer-readable storage medium storing a computer program. When the computer program is executed by a processor, the refrigerant leak detection method of this disclosure is implemented. The storage medium may be the same as, contained in, or a different component from, the storage unit 11 of the air conditioner 10.

[0104]

Implementation Method 2

[0105] <Detection of Minor Refrigerant Leaks>

[0106] In Embodiment 2, the refrigerant leak detection method and the air conditioner 10 use a pressure sensor 15 and a gas sensor 16 to detect leaks. Furthermore, in Embodiment 2, the refrigerant leak detection method and the air conditioner 10 are also capable of detecting minute refrigerant leaks (also known as slow leaks).

[0107] In this disclosure, a minor refrigerant leak refers to a leak occurring at a rate lower than or below a specified value. For example, a refrigerant leak occurring at a rate less than 7.5 kg / h is considered a minor leak.

[0108] In embodiment 2, the air conditioner 10 further includes at least one gas sensor 16 (refrigerant sensor). Figure 1 Gas sensor 16 is used to detect refrigerant flowing through refrigerant piping 21. It can be a semiconductor, contact combustion, electrochemical, or optical type, including non-dispersive infrared (NDIR). Typically, gas sensor 16 is located on the outside of refrigerant piping 21, and can be installed on either the indoor unit 30 or the outdoor unit 40. In cases where high-risk indoor leaks need to be detected, gas sensor 16 is installed on the indoor unit 30.

[0109] As described above, the gas sensor 16 can detect the presence of leaking refrigerant, but it cannot detect the rate of refrigerant leakage. Therefore, even if the gas sensor 16 detects refrigerant, it cannot distinguish between a rapid leak and a minor leak. Here, the refrigerant leak detection method and the air conditioner 10 determine whether the leak is rapid or minor by combining the pressure sensor 15 and the gas sensor 16.

[0110] Figure 7 This is a flowchart of an example of a refrigerant leak detection method in Implementation Method 2. Figure 7 The refrigerant leak detection method shown includes steps S110, S120, S130A, S130B, and steps S210 to S230. Figure 7 Steps S110 and S120 in the process are similar to those in the process. Figure 3 Steps S110 and S120 in the above embodiments are identical, and detailed descriptions are omitted here. Additionally, in Embodiment 2, step S130 includes... Figure 7 Steps S130A and S130B are shown.

[0111] exist Figure 7In the process, the control unit 13 acquires pressure information and determines whether the decrease in refrigerant pressure is greater than a change threshold (steps S110 and S120). Next, based on the determination result of step S120, the control unit 13 determines whether there is a rapid refrigerant leak (step S130A). If the pressure decrease is greater than the change threshold, the control unit 13 detects a rapid refrigerant leak (step S130B).

[0112] On the other hand, if the pressure drop is less than the change threshold, that is, if the pressure sensor 15 does not detect a rapid leak, the control unit 13 further determines whether the gas sensor 16 detects refrigerant (step S210).

[0113] If refrigerant is detected by the gas sensor 16, the control unit 13 detects a minor refrigerant leak (step S220). In this case, even if refrigerant leaks from the refrigerant pipe 21 located in the indoor unit 30, the possibility of fire is low because the leakage rate is slower than the rate at which a fire could occur, and the unit is in a relatively safe state.

[0114] When a minor refrigerant leak is detected, the control unit 13 responds by executing a second response measure (step S230). Since a minor leak is in a relatively safe state compared to a rapid leak, the second response measure may not include outputting an alarm for immediate evacuation or activating the shut-off valve 17. The second response measure may include outputting at least one of the following: a notification indicating a minor leak has been detected, a notification recommending ventilation, or a notification recommending maintenance of the air conditioner 10. Alternatively, the second response measure may also include starting the indoor fan 31.

[0115] On the other hand, if no rapid leak or refrigerant is detected, the control unit 13 completes the refrigerant leak detection process. When the next processing cycle of refrigerant leak detection begins, the control unit 13 also starts from step S110.

[0116] Additionally, if a rapid leak and refrigerant leak are detected, the control unit 13 may also perform the aforementioned step S140. Figure 5 ).

[0117] Figure 8 This is a schematic diagram of refrigerant pressure changes when a minor leak occurs. In the event of a minor refrigerant leak, the refrigerant gas pressure gradually decreases due to the decrease in refrigerant temperature caused by the latent heat of vaporization. Figure 4B and Figure 8 In comparison, the pressure drop during a minor leak is slower than the pressure drop during a rapid leak, indicating a slower leakage rate during a minor leak.

[0118] As described above, by using pressure sensor 15 and gas sensor 16 together, both rapid and minute leaks of refrigerant can be detected. Furthermore, because rapid and minute leaks can be detected, different countermeasures can be implemented accordingly.

[0119]

Implementation Method 3

[0120] <Detection of refrigerant leaks outdoors>

[0121] In Embodiment 3, the refrigerant leak detection method and the air conditioner 10 use a pressure sensor 15 and a gas sensor 16 to detect leaks. In Embodiment 3, the refrigerant leak detection method and the air conditioner 10 can further detect outdoor refrigerant leaks. Furthermore, outdoor refrigerant leaks in this disclosure refer to leaks where the refrigerant leak is located at the outdoor unit 40 or between the indoor unit 30 and the outdoor unit 40.

[0122] In embodiment 3, similar to embodiment 2, the air conditioner 10 further includes at least one gas sensor 16. Figure 1 ).

[0123] Figure 9 This is a flowchart of an example of a refrigerant leak detection method in Implementation Method 3. Figure 9 The refrigerant leak detection method shown includes steps S110 to S140 and steps S310 to S330. Figure 9 Steps S110~S140 in the middle and Figure 5 The steps S110 to S140 are identical, and detailed information is omitted here.

[0124] exist Figure 9 In the illustrated embodiment, the gas sensor 16 is disposed on the indoor unit 30. The control unit 13 can determine whether a refrigerant leak has occurred from the refrigerant piping 21 located within the indoor unit 30 via the gas sensor 16. Figure 9 In the illustrated embodiment, the control unit 13 further determines whether a rapid leak is detected by the pressure sensor 15 and whether refrigerant is detected by the gas sensor 16 (step S310). If a rapid leak is detected but refrigerant is not detected by the gas sensor 16 located in the indoor unit 30, the control unit 13 detects an outdoor refrigerant leak (step S320).

[0125] In this situation, although the refrigerant is leaking rapidly, the leak is located outdoors. Compared to indoors, the outdoor environment allows for airflow that dilutes the leaking refrigerant, thus reducing the likelihood of ignition and placing the area in a relatively safe condition.

[0126] When an outdoor refrigerant leak is detected, the control unit 13 responds by executing the third response measure (step S330). Since an outdoor leak is in a relatively safe state compared to a rapid indoor leak, the third response measure may not include issuing an immediate evacuation alarm or activating the shut-off valve 17. Accordingly, the third response measure may also include issuing a notification indicating the detection of an outdoor leak or recommending maintenance of the air conditioner 10. Additionally, the third response measure may also include activating the outdoor fan 41.

[0127] On the other hand, if a rapid leak is detected and refrigerant is detected by the gas sensor 16 configured in the indoor unit 30, it can be determined that a rapid leak has occurred indoors. At this time, the control unit 13 performs the above-mentioned step S140 and executes the first countermeasure.

[0128] In another embodiment, the gas sensor 16 is disposed in the outdoor unit 40, or disposed between the indoor unit 30 and the outdoor unit 40. In this embodiment, if a rapid leak is detected and refrigerant is detected by the gas sensor 16 disposed in the outdoor unit 40, the control unit 13 performs a third countermeasure. If a rapid leak is detected but refrigerant is not detected by the gas sensor 16 disposed in the outdoor unit 40, the control unit 13 performs a first countermeasure.

[0129] As described above, by using pressure sensor 15 and gas sensor 16 together, rapid refrigerant leakage and outdoor leakage can be detected. Furthermore, different response measures can be implemented based on whether the leakage is rapid or outdoor.

[0130] Furthermore, it is possible to combine the detection of the three types of leaks—rapid leaks, minor leaks, and outdoor leaks—and the first to third response measures. For example, the storage unit 11 stores a comparison table of multiple leak states and corresponding response measures for each leak state. The control unit 13 compares the determined leak condition with the comparison table to determine the response measures to be taken.

[0131] In addition, this disclosure also provides a computer program and storage medium for a refrigerant leakage detection method for an air conditioner 10 corresponding to embodiments 2 and 3.

[0132]

Implementation Method 4

[0133] <Detection Device and Refrigerant Leakage Detection Method>

[0134] In embodiment 4, a rapid leak of flammable refrigerant within the air conditioner 10 can be detected using a detection device different from that used in the air conditioner 10. For example, a server 50 or a terminal device 60 capable of acquiring pressure information from the air conditioner 10 can detect the rapid leak based on the acquired pressure information.

[0135] Figure 10A This is a block diagram illustrating a schematic structure of the detection device in Embodiment 4. Figure 10A In the illustrated embodiment, server 50 functions as a detection device. Figure 10A The server 50 shown includes a storage unit 51, a communication unit 52, a control unit 53, and a prompting unit 54. The server 50 can communicate with the air conditioner 10 via the communication unit 52. Figure 10A In the illustrated embodiment, the refrigerant leak detection method is not implemented by the control unit 13 of the air conditioner 10, but by the control unit 53 of the server 50, which serves as the detection device. Furthermore, the control unit 53 of the server 50 does not directly obtain pressure information from the pressure sensor 15 of the air conditioner 10, but indirectly obtains pressure information from the air conditioner 10 via the storage unit 51 or the communication unit 52.

[0136] Figure 10B This is a block diagram illustrating another schematic structure of the detection device in Embodiment 4. Figure 10B In the embodiment shown, the terminal device 60 functions as a detection device. Figure 10B The terminal device 60 shown includes an associated application program 61, a storage unit 62, a communication unit 63, a control unit 64, and a prompting unit 65. The terminal device 60 can communicate with the air conditioner 10 via the communication unit 63. Figure 10B In the illustrated embodiment, the refrigerant leak detection method is not implemented by the control unit 13 of the air conditioner 10, but by the control unit 64 of the terminal device 60, which serves as the detection device. Furthermore, the control unit 64 of the terminal device 60 does not directly obtain pressure information from the pressure sensor 15 of the air conditioner 10, but indirectly obtains pressure information from the air conditioner 10 or the server 50 via the storage unit 62 or the communication unit 63.

[0137] Figure 11 This is a flowchart of an example of a refrigerant leak detection method in Implementation Method 4. Figure 11 The refrigerant leak detection method shown is implemented by a detection device and includes steps S410 to S430.

[0138] exist Figure 11In the illustrated embodiment, the control unit of the detection device (e.g., control unit 53 or control unit 64) acquires pressure information via a communication unit (e.g., communication unit 52 or communication unit 63) using a pressure sensor 15 disposed in the air conditioner 10 (step S410). Based on the acquired pressure information, the control unit of the detection device determines whether the pressure change within a specified time exceeds a change threshold (step S420), and based on the determination result, detects a rapid refrigerant leak (step S430). The processing in steps S420 and S430 is substantially the same as... Figure 3 The processing content of steps S120 and S130 is the same, and the details are omitted here.

[0139] Therefore, the detection device, which is communicatively connected to the air conditioner 10, can obtain pressure information related to the pressure of the refrigerant in the refrigerant piping 21 of the air conditioner 10 via the Internet or the like. According to this refrigerant leak detection method and device, rapid leaks of flammable refrigerants can be detected, and appropriate first countermeasures can be executed in response to the detection of rapid leaks. Furthermore, the detection device can further implement the detection methods described in embodiments 2 and 3 to detect minor leaks or outdoor leaks, and can also execute appropriate countermeasures according to different leak conditions.

[0140] In one embodiment, the server 50 or terminal device 60, serving as a detection device, has features for implementation. Figure 11 The procedure for the refrigerant leak detection method shown is used to enable the refrigerant leak detection method to be implemented by the control unit 53 of the server 50 or the control unit 64 of the terminal device 60.

[0141] In one embodiment, the server 50 or terminal device 60, serving as a detection device, has a non-volatile computer-readable storage medium storing a computer program. When the computer program is executed by a processor, the refrigerant leak detection method of this disclosure is implemented. The storage medium may be the same as, contained in, or a different component from the storage section 51 or 62 of the server 50 or terminal device 60.

[0142] (Other implementation methods)

[0143] (Postscript)

[0144] Based on the description of the above embodiments, the following technology is disclosed.

[0145] (Technology 1) An air conditioner using a flammable refrigerant, comprising: a refrigerant piping in which a refrigerant flows; a pressure sensor disposed on the refrigerant piping to acquire pressure information associated with the pressure of the refrigerant in the refrigerant piping; and a control unit that acquires the pressure information from the pressure sensor, determines, based on the pressure information, whether a pressure change within a specified time exceeds a change threshold, and detects rapid leakage of the refrigerant based on the determination result.

[0146] Based on this air conditioner, it is possible to detect rapid leakage of flammable refrigerant from the refrigerant piping of the air conditioner.

[0147] (Technology 2) The air conditioner as described in Technology 1, wherein the variation threshold is set based on at least one of the type of refrigerant, the internal volume of the refrigerant piping loop, and the amount of refrigerant supplied to the air conditioner.

[0148] Based on this change threshold, rapid refrigerant leakage can be detected more accurately.

[0149] (Technology 3) An air conditioner as described in Technology 1 or 2, wherein the variation threshold is set based on a leakage rate of 7.5 kg / h or higher.

[0150] Based on this change threshold, rapid refrigerant leakage can be detected more accurately.

[0151] (Technology 4) The air conditioner as described in any one of Technologies 1 to 3, wherein the specified time is 30 seconds or less.

[0152] According to the specified time, rapid refrigerant leaks can be detected immediately.

[0153] (Technology 5) An air conditioner as described in any one of Technologies 1 to 4, wherein the control unit performs a first response measure in response to the detection of a rapid leak, the first response measure including outputting a notification or alarm indicating the detection of a rapid leak and recommending evacuation at least one.

[0154] This allows for the implementation of appropriate countermeasures in response to rapid refrigerant leakage.

[0155] (Technology 6) An air conditioner as described in any one of Technologies 1 to 5, the air conditioner including a shut-off valve disposed in the refrigerant piping, the control unit performing a first countermeasure in response to detecting a rapid leak, the first countermeasure including activating the shut-off valve to cut off the flow of refrigerant in the refrigerant piping.

[0156] This allows for the implementation of appropriate countermeasures in response to rapid refrigerant leakage.

[0157] (Technology 7) An air conditioner as described in any one of Technologies 1 to 6, the air conditioner including an indoor fan, the control unit responding to the detection of a rapid leak by performing a first countermeasure, the first countermeasure including activating the indoor fan.

[0158] This allows for the implementation of appropriate countermeasures in response to rapid refrigerant leakage.

[0159] (Technology 8) An air conditioner as described in any one of Technologies 1 to 7, the air conditioner comprising an indoor unit; and a gas sensor disposed within the indoor unit and outside the refrigerant piping for detecting the refrigerant, the control unit, in determining that no rapid leak is detected by the pressure sensor and the refrigerant is detected by the gas sensor, detects a minor leak of the refrigerant and executes a second countermeasure in response to the detection of the minor leak.

[0160] This allows for the detection of even minute refrigerant leaks. Furthermore, because it can detect both rapid and minute leaks, different appropriate countermeasures can be implemented.

[0161] (Technology 9) The second response to the air conditioner as described in Technology 8 includes issuing a notification or alarm indicating that at least one of the following has been detected: a minor leak has been detected; a suggestion to suspend the use and ventilation of the air conditioner has been made; and a suggestion to repair the air conditioner has been made.

[0162] This allows for appropriate countermeasures to be taken based on even minor refrigerant leaks.

[0163] (Technology 10) An air conditioner as described in any one of Technologies 1 to 9, the air conditioner comprising an indoor unit; a gas sensor disposed inside the indoor unit and outside the refrigerant piping, for detecting the refrigerant; the control unit, in determining that a rapid leak has been detected by the pressure sensor and the refrigerant has not been detected by the gas sensor, detecting an outdoor leak of the refrigerant, and executing a third countermeasure in response to the detection of the outdoor leak.

[0164] This allows for the detection of refrigerant leaks outdoors. Furthermore, because it can detect both rapid leaks and outdoor leaks, different appropriate countermeasures can be implemented.

[0165] (Technology 11) An air conditioner as described in Technology 10, the air conditioner including an outdoor fan, the third response including activating the outdoor fan.

[0166] This allows for appropriate countermeasures to be taken in response to outdoor refrigerant leaks.

[0167] (Technology 12) An air conditioner as described in any one of Technologies 1 to 11, the air conditioner comprising an indoor unit and an outdoor unit, wherein the pressure sensor is disposed in a portion of the refrigerant piping located within the indoor unit.

[0168] Based on this pressure sensor, the leak detection sensitivity is high.

[0169] (Technology 13) An air conditioner as described in Technology 12, the air conditioner including a refrigeration cycle including the refrigerant piping, a compressor and an indoor heat exchanger, wherein the pressure sensor is disposed in a portion of the refrigerant piping located within the indoor unit and between the indoor heat exchanger and the compressor.

[0170] In this way, the pressure information of the refrigerant gas can be obtained whether the refrigeration cycle is in a cooling cycle or a heating cycle.

[0171] (Technology 14) A detection device for detecting refrigerant leakage in an air conditioner, comprising: a communication unit that acquires pressure information associated with the pressure of refrigerant flowing in the refrigerant piping of the air conditioner; and a control unit that, based on the pressure information, determines whether a pressure change within a specified time exceeds a change threshold, and detects rapid leakage of the refrigerant based on the determination result.

[0172] (Technology 15) A method for detecting refrigerant leakage in an air conditioner, comprising: acquiring pressure information associated with the pressure of refrigerant flowing in the refrigerant piping via a pressure sensor installed in the refrigerant piping of the air conditioner; determining, based on the pressure information, whether the pressure change within a specified time exceeds a change threshold; and detecting rapid leakage of the refrigerant based on the determination result.

[0173] (Technology 16) A method for detecting refrigerant leakage in an air conditioner, comprising: acquiring pressure information associated with the pressure of refrigerant flowing in the refrigerant piping of the air conditioner; determining, based on the pressure information, whether a pressure change within a specified time exceeds a change threshold; and detecting a rapid leakage of the refrigerant based on the determination result.

[0174] (Technology 17) A procedure that causes an air conditioner to perform the refrigerant leak detection method of Technology 15, or causes a detection device to perform the refrigerant leak detection method of Technology 16.

[0175] (Technology 18) A non-volatile computer-readable storage medium storing a computer program, which, when executed by a processor, implements the refrigerant leak detection method of Technology 15 or 16.

[0176] Based on the above detection devices, refrigerant leak detection methods, procedures, or storage media, it is possible to detect rapid leaks of flammable refrigerant from the refrigerant piping of an air conditioner.

[0177] The above are merely specific embodiments of this disclosure, and the scope of protection of this disclosure is not limited thereto. This disclosure includes the accompanying drawings and the content described in the above specific embodiments, but this disclosure is not limited to these contents. Various disclosed embodiments or examples can be combined without departing from the scope or spirit of this disclosure. Changes that do not depart from the functional and structural principles of this disclosure are within the scope of the claims.

[0178] Explanation of reference numerals in the attached figures

[0179] 10. Air conditioner

[0180] 11 Storage Department

[0181] 12 Ministry of Communications

[0182] 13 Control Department

[0183] 14. Reminder Section

[0184] 15 Pressure Sensor

[0185] 16 Gas Sensors

[0186] 17. Flow interruption valve

[0187] 20 Refrigeration Cycle

[0188] 21 Refrigerant piping

[0189] 22 Compressor

[0190] 23 Expansion valve

[0191] 24 Four-way valve

[0192] 25 Indoor heat exchanger

[0193] 26 Outdoor heat exchanger

[0194] 30 Indoor Units

[0195] 31 Indoor Fan

[0196] 40 Outdoor Unit

[0197] 41 Outdoor Fan

[0198] 50 servers

[0199] 51 Storage Department

[0200] 52 Ministry of Communications

[0201] 53 Control Department

[0202] 54. Tips / Reminders

[0203] 60 terminal devices

[0204] 61 Related Applications

[0205] 62 Storage Unit

[0206] 63 Ministry of Communications

[0207] 64 Control Department

[0208] 65. Tips

[0209] Configuration locations p1~p8

[0210] During the period from D1 to D3.

Claims

1. An air conditioner using a flammable refrigerant, characterized in that, include: Refrigerant piping, through which refrigerant flows; A pressure sensor is installed in the refrigerant piping to acquire pressure information associated with the pressure of the refrigerant in the refrigerant piping. and The control unit acquires the pressure information from the pressure sensor, determines whether the pressure change within a specified time exceeds a change threshold based on the pressure information, and detects rapid leakage of the refrigerant based on the determination result.

2. The air conditioner as described in claim 1, characterized in that: The change threshold is set based on at least one of the type of refrigerant, the internal volume of the refrigerant piping loop, and the amount of refrigerant packed into the air conditioner.

3. The air conditioner as described in claim 1, characterized in that: The change threshold is set based on a leakage rate of 7.5 kg / h or higher.

4. The air conditioner as described in claim 1, characterized in that: The specified time is less than 30 seconds.

5. The air conditioner as described in claim 1, characterized in that: The control unit, upon detecting a rapid leak, executes the first response measure. The first response includes outputting a notification or alarm indicating that at least one of a rapid leak has been detected and recommending evacuation.

6. The air conditioner as described in claim 1, characterized in that: The air conditioner includes a shut-off valve installed on the refrigerant piping. The control unit, upon detecting a rapid leak, executes the first response measure. The first countermeasure includes activating the shut-off valve to cut off the flow of refrigerant in the refrigerant piping.

7. The air conditioner as described in claim 1, characterized in that: The air conditioner includes an indoor fan. The control unit, upon detecting a rapid leak, executes the first response measure. The first response measure includes activating the indoor fan.

8. The air conditioner as described in claim 1, characterized in that: The air conditioner includes: Indoor unit; and A gas sensor for detecting the refrigerant, installed inside the indoor unit and outside the refrigerant piping. The control unit, If it is determined that no rapid leak was detected by the pressure sensor and the refrigerant was detected by the gas sensor, then a minor leak of the refrigerant is detected. Upon detection of a minor leak, the second response measure was executed.

9. The air conditioner as described in claim 8, characterized in that: The second response includes outputting a notification or alarm indicating the detection of a minor leak, recommending that the air conditioner be taken out of service and that ventilation be performed, and recommending that at least one of the air conditioners be repaired.

10. The air conditioner as described in claim 1, characterized in that: The air conditioner includes: Indoor unit; and A gas sensor for detecting the refrigerant, installed inside the indoor unit and outside the refrigerant piping. The control unit, If it is determined that a rapid leak has been detected by the pressure sensor but the refrigerant has not been detected by the gas sensor, then an outdoor leak of the refrigerant is detected. Upon detection of an outdoor leak, the third response measure was implemented.

11. The air conditioner as described in claim 10, characterized in that: The air conditioner includes an outdoor fan. The third response measure includes activating the outdoor fan.

12. The air conditioner as described in claim 1, characterized in that: The air conditioner includes an indoor unit and an outdoor unit. The pressure sensor is located in the portion of the refrigerant piping inside the indoor unit.

13. The air conditioner as described in claim 12, characterized in that: The air conditioner includes a refrigeration cycle. The refrigeration cycle includes the refrigerant piping, compressor, and indoor heat exchanger. The pressure sensor is located in the portion of the refrigerant piping inside the indoor unit and between the indoor heat exchanger and the compressor.

14. A detection device for detecting refrigerant leakage in an air conditioner, characterized in that, include: The communication unit acquires pressure information associated with the pressure of the refrigerant flowing within the refrigerant piping of the air conditioner; and The control unit determines, based on the pressure information, whether the pressure change within a specified time exceeds a change threshold, and detects rapid leakage of the refrigerant based on the determination result.

15. A method for detecting refrigerant leakage in an air conditioner, characterized in that, include: The step of acquiring pressure information associated with the pressure of the refrigerant flowing in the refrigerant piping using a pressure sensor installed in the refrigerant piping of the air conditioner; The step of determining whether the pressure change within a specified time period is greater than the change threshold based on the pressure information; and The step of detecting rapid leakage of the refrigerant based on the judgment result.

16. A method for detecting refrigerant leakage in an air conditioner, characterized in that, include: The step of obtaining pressure information associated with the pressure of the refrigerant flowing in the refrigerant piping of the air conditioner; The step of determining whether the pressure change within a specified time period is greater than the change threshold based on the pressure information; and The step of detecting rapid leakage of the refrigerant based on the judgment result.

17. A program product comprising a computer program, characterized in that: When the computer program is executed by the processor, it causes the air conditioner to perform the refrigerant leak detection method of claim 15, or causes the detection device to perform the refrigerant leak detection method of claim 16.

18. A non-volatile, computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by the processor, the refrigerant leak detection method of claim 15 or 16 is implemented.

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