Method and device for detecting leakage of check valve, central range hood system and storage medium

Abstract

The application discloses a check valve leakage detection method, a detection device, a central fume machine system and a storage medium. The check valve leakage detection method comprises the following steps: controlling at least one terminal fume machine of the central fume machine system to be turned on to exhaust air to a public flue, and other terminal fume machines to be turned off; collecting output signals of branch sensors corresponding to the terminal fume machines in the closed state, the branch sensors being arranged in terminal flues between check valves and the terminal fume machines, the check valves being connected to the public flue, and the output signals of the branch sensors comprising pressure signals and / or flow rate signals; and determining that the check valves corresponding to the terminal fume machines in the closed state are leaking in the case that the output signals of the branch sensors fluctuate beyond a preset range. The above detection method can determine the corresponding check valve leakage, and realizes the detection of the check valve leakage.

Description

Technical Field

[0001] This invention relates to the field of smoke exhaust equipment technology, and in particular to a method, device, central smoke exhaust system, and storage medium for detecting check valve leakage. Background Technology

[0002] Currently, some buildings have a shared flue, where the terminal flues of the range hoods in each household can be connected to this shared flue. To prevent backflow of cooking fumes, check valves are installed in these terminal flues. In related technologies, central range hood systems can be applied to these buildings with shared flues. A central range hood system can control each range hood based on its operating status. However, this control relies on the overall system's excellent sealing; if leaks occur, the actual situation will deviate significantly from the calculated data, affecting control accuracy. Therefore, how to detect check valve leaks becomes a technical problem to be solved. Summary of the Invention

[0003] The present invention provides a method, a detection device, a central smoke machine system, and a storage medium for detecting check valve leakage.

[0004] An embodiment of the present invention provides a method for detecting leakage in a check valve, comprising:

[0005] At least one terminal smoke hood of the central smoke hood system is turned on to exhaust air into the common smoke duct, while the other terminal smoke hoods are turned off.

[0006] The output signals of the corresponding branch sensors of the terminal flue that are in the closed state are collected. The branch sensors are located in the terminal flue between the check valve and the terminal flue. The check valve is connected to the common flue. The output signals of the branch sensors include pressure signals and / or flow rate signals.

[0007] If the output signal fluctuation of the branch sensor exceeds the preset range, it is determined that the corresponding check valve of the terminal smoke machine in the closed state is leaking.

[0008] The above detection method creates positive pressure by turning on at least one terminal exhaust fan to exhaust air into the common flue, and collects the output signal of the branch sensor corresponding to the terminal exhaust fan in the closed state. If the output signal of the branch sensor fluctuates beyond the preset range, the corresponding check valve can be identified as leaking, thus realizing the detection of check valve leakage.

[0009] In some implementations, controlling at least one terminal smoke hood of the central smoke hood system to turn on to exhaust air into the common flue, while shutting off other terminal smoke hoods includes:

[0010] Divide all the terminal smoke hoods on each floor into at least two smoke hood groups;

[0011] Control one of the smoke generator units to turn on, and the others to turn off.

[0012] An embodiment of the present invention provides a method for detecting leakage in a check valve, comprising:

[0013] The system controls the opening of a single terminal smoke machine in the central smoke machine system, collects the output signals of the branch sensors in real time, and keeps the electric check valve in a closed state for a preset time after opening. The output signals of the branch sensors include pressure signals and / or flow rate signals. The branch sensors are located in the terminal flue between the electric check valve and the terminal smoke machine.

[0014] After the preset time period, the electric check valve is controlled to open;

[0015] Compare the differences between the output signals of the branch sensors acquired in real time and the preset reference signals;

[0016] If the difference is greater than a preset difference, the electric check valve is determined to be leaking.

[0017] The above detection method detects leakage of the electric check valve by comparing the difference between the output signal of the branch sensor acquired in real time and the preset reference signal, and determining that the electric check valve is leaking when the difference is greater than the preset difference.

[0018] An embodiment of the present invention provides a method for detecting leakage in a check valve, comprising:

[0019] Collect the smoke concentration output from the smoke sensor;

[0020] When the smoke concentration is greater than or equal to a preset concentration, the control terminal smoke machine is turned on, and the electric check valve is kept in the closed state for a preset time.

[0021] If, after the preset time period, the smoke concentration is less than the preset concentration, it is determined that the electric check valve is leaking.

[0022] If, after the preset time period, the smoke concentration is still greater than or equal to the preset concentration, the electric check valve is controlled to open.

[0023] The above detection method detects leakage of the check valve by detecting changes in smoke concentration when the electric check valve is closed.

[0024] In some embodiments, the detection method includes:

[0025] The terminal smoke hood is turned on according to the preset air volume control.

[0026] In some embodiments, the detection method includes:

[0027] Mark the floor where the check valve is leaking;

[0028] After all check valves have been inspected, compile a list of all marked floors and remind the users on the corresponding floors to repair the check valves.

[0029] In some embodiments, the detection method includes:

[0030] After all check valves have been tested and no check valve leakage is found, a message indicating no check valve leakage will be displayed.

[0031] An embodiment of the present invention provides a check valve leakage detection device comprising a processor and a memory, wherein the memory stores a computer program, and the computer program, when executed by the processor, implements the steps of the detection method of any of the above embodiments.

[0032] An embodiment of the present invention provides a central smoke machine system including the check valve leakage detection device described in the above embodiment.

[0033] This invention provides a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the steps of the detection method of any of the above embodiments.

[0034] The aforementioned check valve leakage detection device, central smoke machine system, and computer-readable storage medium can detect check valve leakage.

[0035] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0036] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0037] Figure 1 This is a flowchart illustrating the method for detecting check valve leakage according to an embodiment of the present invention.

[0038] Figure 2 This is an installation diagram of the central smoke machine system according to an embodiment of the present invention;

[0039] Figures 3 to 5 This is a flowchart illustrating the method for detecting check valve leakage according to an embodiment of the present invention.

[0040] Figure 6 This is a schematic diagram of the central smoke machine system according to an embodiment of the present invention;

[0041] Figure 7This is a structural diagram of a traditional smoke extraction system for high-rise residential buildings in related technologies;

[0042] Figure 8 This is a schematic diagram of a centralized central smoke machine system in related technologies;

[0043] Figure 9 This is a schematic diagram of the structure of a distributed central smoke machine system in related technologies. Detailed Implementation

[0044] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0045] In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0046] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. They can refer to a mechanical connection or an electrical connection. They can refer to a direct connection or an indirect connection through an intermediate medium, and they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances.

[0047] In this invention, unless otherwise expressly specified and limited, the first feature "above" or "below" the second feature may include direct contact between the first and second features, or contact between the first and second features not in direct contact but through another feature between them.

[0048] This disclosure provides many different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described herein. These are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0049] Currently, traditional smoke extraction systems in high-rise residential buildings consist of a common smoke duct (also known as a common smoke exhaust pipe) and branch lines at each user end. For example... Figure 7 As shown, a branch line can consist of a check valve, a bellows, and a range hood. The bellows form the terminal flue, and the fumes from the user end are discharged from the branch line to the common flue, then flow upwards along the common flue and are discharged from the top of the common flue. For lower-floor users, the exhaust resistance mainly comes from the common flue, including friction loss along the common flue and merging loss when flowing through the exhaust ports of the branch lines of users on the upper floors. Therefore, when there are many open floors, the exhaust resistance of lower-floor users is higher, the range hood's suction volume is insufficient, and the actual exhaust effect is poor. Although current range hood technology is constantly iterating towards larger air volume and lower noise, the extremely high exhaust resistance in some actual use situations makes it impossible to simultaneously achieve both air volume and noise level. At the same time, due to the large difference in exhaust resistance between upper-floor and lower-floor users, an awkward situation arises where upper-floor users have excessive actual air volume while lower-floor users have insufficient actual air volume, resulting in poor exhaust effect for lower-floor users and energy waste for upper-floor users. In addition, to prevent backflow of fumes from the public flue into the user end, a passive flue check valve is usually installed at the interface between the user's branch and the public flue. When the user's exhaust fan (terminal exhaust fan) is off, the flue check valve is usually kept closed by the spring force and the weight of the valve plate, preventing fumes from the public flue from flowing into the user's branch. When the user's exhaust fan is on, the fluid discharged from the branch to the public flue overcomes the spring force and the weight of the valve plate, causing the valve plate to open. However, this type of passive check valve has the following disadvantages: ① When the airflow in the branch is low, the valve plate opening angle is too small, resulting in high exhaust resistance; ② Problems such as aging and failure of the flue check valve spring and grease buildup on the valve plate can affect the sealing performance when the valve plate is closed, leading to backflow of fumes.

[0050] Therefore, the smoke extraction problem in high-rise residential buildings is a systemic issue that requires system-level control measures to solve. This is where central smoke extraction systems come in. Central smoke extraction systems typically use top-mounted fans located at the public smoke duct outlet as the main or sole power source. Based on the airflow demand of the terminal fans, a control center coordinates and regulates the operating status of all components of the entire central smoke extraction system in real time, meeting the smoke extraction needs of users under all operating conditions.

[0051] Based on the branch power distribution method, central smoke machine systems can be divided into two categories: centralized and distributed. Schematic diagrams of the two types of central smoke machine systems are shown below. Figure 8 and Figure 9As shown. In a centralized central exhaust system, each branch has only a smoke collection hood, not a range hood. The entire system uses a top-mounted fan as its sole power source. At the interface between a branch and the common exhaust duct, a power-operated check valve (also known as an electrically controlled valve) with an adjustable valve opening angle is installed. During system operation, the airflow distribution within the branch can be achieved by adjusting the valve's opening angle. In a distributed central exhaust system, each branch has an adjustable-speed range hood. The entire system uses a top-mounted fan as the primary power source, with terminal exhaust fans serving as auxiliary power sources. At the branch outlet, a power-operated check valve with an adjustable valve opening angle is installed. This check valve has two states: ON / OFF (fully open / fully closed). During system operation, the airflow distribution within the branch can be achieved by adjusting the speed of the terminal exhaust fans.

[0052] Due to differences in system components and operating mechanisms, the two types of central exhaust fan systems each have their own advantages. The advantages of a centralized central exhaust fan system are mainly reflected in the following aspects: the public exhaust duct is always under full negative pressure, which can strictly prevent oil fumes from flowing back into the user's kitchen from the public exhaust duct; since there are no exhaust fans in the branch circuits, the noise of the branch circuits is significantly reduced, with a reduction of up to 10dB; in addition, since there are no exhaust fans occupying space in the branch circuits of a centralized central exhaust fan system, the smoke collection hoods of the branch circuits occupy a smaller size, and the shape design can be more flexible and aesthetically pleasing. The advantages of a distributed central exhaust fan system are mainly reflected in the following aspects: Because the branch check valves of a distributed central exhaust fan system always keep the system fully open when the branch is working, the system resistance is lower than that of a centralized system under the same operating conditions, so the overall energy consumption level is also better than that of a centralized system; the terminal exhaust fans of a distributed system can achieve the oil fume separation function of a traditional range hood, and it is not easy for dirt to accumulate in the branch exhaust ducts; because the distributed central exhaust fan system has terminal exhaust fans as an auxiliary power source, the operating parameters of the top fan are less demanding, and when the top fan fails, the exhaust function can still be achieved by relying on the terminal exhaust fans, resulting in high system redundancy and high reliability.

[0053] However, regardless of whether it's a centralized or distributed central flue gas system, because it uses a control platform and corresponding calculation models to coordinate the control of terminal and top-end fans, the built-in calculations assume the entire system is well-sealed. If leakage occurs, the actual situation will deviate significantly from the calculated data, affecting control accuracy. Therefore, central flue gas systems have high requirements for system sealing. Unlike the check valves in traditional flue gas systems, central flue gas systems all use electric check valves. Whether it's a centralized electric check valve with adjustable opening or a distributed electric check valve with only on / off positions, its sealing of the branch circuit must be absolutely guaranteed. That is, when the branch circuit is not working, the electric check valve must be completely closed and must not affect the overall system sealing. Traditional check valves suffer from problems such as spring aging and failure, and oil fume buildup on the valve plates after prolonged use, leading to poor sealing. Similarly, electric check valves may also experience problems such as oil fume buildup and assembly deviations, causing them to fail to close completely, resulting in sealing issues.

[0054] Distributed central flue gas systems use electric check valves with only two settings. The focus of the system is on the coordinated control of the fan speed of the terminal flue gas fan and the speed of the top fan (centralized central flue gas systems focus on the coordinated control of the opening angle of the electric check valve and the speed of the top fan). Little attention is paid to the electric check valve, and the flue is under positive pressure (negative pressure in centralized systems). If the electric check valve leaks, it will cause significant backflow of oil fumes. Therefore, the sealing problem of the flue check valve in the distributed central flue gas system needs to be taken seriously.

[0055] Based on the above discussion, this invention provides a method for detecting leakage in the flue check valve of a distributed central flue gas system, filling a gap in this field.

[0056] Please refer to Figure 1 and Figure 2 A method for detecting leakage in a check valve 18 according to an embodiment of the present invention includes:

[0057] Step 101: Control at least one terminal smoke hood 12 of the central smoke hood system 100 to turn on to exhaust air into the common smoke duct 14, and turn off the other terminal smoke hoods 12;

[0058] Step 103: Collect the output signal of the corresponding branch sensor 16 of the terminal smoke hood 12 in the closed state. The branch sensor 16 is located in the terminal flue 19 between the check valve 18 and the terminal smoke hood 12. The check valve 18 is connected to the common flue 14. The output signal of the branch sensor 16 includes pressure signal and / or flow rate signal.

[0059] Step 105: If the output signal fluctuation of the branch sensor 16 exceeds the preset range, it is determined that the check valve 18 of the terminal smoke hood 12, which is in the closed state, is leaking.

[0060] The above detection method generates positive pressure by turning on at least one terminal smoke hood 12 to exhaust air into the common flue 14, and collects the output signal of the branch sensor 16 corresponding to the terminal smoke hood 12 in the closed state. When the output signal of the branch sensor 16 flues beyond the preset range, it can be determined that the corresponding check valve 18 is leaking, thus realizing the detection of the check valve 18 leakage.

[0061] Specifically, the central smoke-making system 100 in this embodiment of the invention can be a distributed central smoke-making system 100, please refer to... Figure 2The central smoke control system 100 includes terminal smoke hoods 12, branch sensors 16, check valves 18, a common smoke duct 14, top fans 20, vent caps 22, and a control center 24. The control center 24 communicates in real time with the terminal smoke hoods 12 and branch sensors 16 to ensure the stable and normal operation of the entire central smoke control system 100. In one embodiment, the check valve 18 can be a passive check valve. In another embodiment, the check valve 18 can be an electric check valve. The operating state of the electric check valve 18 is linked to the operating state of the corresponding terminal smoke hood 12. For example, when the terminal smoke hood 12 on a certain floor is turned on, the corresponding electric check valve 18 on that floor opens, connecting the terminal smoke duct 19 to the common smoke duct 14. When the terminal smoke hood 12 is turned off, the corresponding electric check valve 18 on that floor closes, isolating the terminal smoke duct 19 from the common smoke duct 14. When the terminal range hood 12 is turned on, the fan of the terminal range hood 12 (hereinafter referred to as the terminal fan) rotates to remove the fumes. When the terminal range hood 12 is turned off, the terminal fan stops rotating. The terminal range hood 12 can be a range hood or an integrated cooktop.

[0062] The electric check valve 18 has two positions: ON and OFF. In the ON position, the electric check valve 18 is fully open, connecting the terminal flue 19 to the common flue 14. In the OFF position, the electric check valve 18 is fully closed, isolating the terminal flue 19 from the common flue 14. The method for detecting leakage in the check valve 18 can be coupled into the control center 24 via a functional module, representing the intelligent operation of the central flue system 100. This functional module includes the necessary hardware and software.

[0063] Branch sensor 16 may include a pressure sensor and / or a flow rate sensor, and is installed in the terminal flue 19 between the check valve 18 and the terminal flue 12. Branch sensor 16 is used to realize closed-loop control of the distributed central flue system 100.

[0064] Controlling the central smoke machine system 100 to turn on at least one terminal smoke machine 12 can be done by controlling one terminal smoke machine 12 to turn on, or by controlling several terminal smoke machines 12 to turn on simultaneously, wherein the number of terminal smoke machines 12 turned on simultaneously is less than the total number of terminal smoke machines 12.

[0065] After the terminal smoke hood 12 is turned on, the terminal fan starts running. At this time, the common flue 14 should be under positive pressure, and the check valve 18 corresponding to the terminal smoke hood 12, which is in the closed state, should be closed. The output signal of the branch sensor 16, which is in the closed state, is collected and analyzed. Since the terminal fan of the terminal smoke hood 12, which is in the closed state, is not turned on, theoretically the output signal of the branch sensor 16 should remain unchanged (or change only slightly) and be in atmospheric condition. If the check valve 18 leaks, the gas in the common flue 14 will backflow into the relevant floors. At this time, the output signal of the branch sensor 16 will change. If the fluctuation of the output signal of the branch sensor 16 exceeds the preset range, it can be considered that the output signal changes drastically, and thus it can be determined that the check valve 18 corresponding to the branch sensor 16 is leaking. The preset range can be pre-calibrated and stored when it is determined that the check valve 18 is not leaking.

[0066] If the output signal fluctuation of the branch sensor 16 does not exceed the preset range, it is determined that the check valve 18 of the terminal smoke hood 12, which is in the closed state, is not leaking.

[0067] In one implementation, the user can activate the "one-click leak detection" function on the terminal range hood 12, or via an app on the user terminal. Once activated, the terminal range hood 12 or the user terminal can send relevant commands to the control center 24. The control center 24 can then control the central range hood system 100 to detect leaks in the check valve 18 based on these commands. User terminals include, but are not limited to, mobile phones, tablets, personal computers, and wearable smart devices.

[0068] In one implementation, the control center 24 can also periodically control the central smoke hood system 100 to detect leaks in the check valve 18.

[0069] In one embodiment, the output signal of the branch sensor 16 includes a pressure signal, which is used to detect leakage in the check valve 18. In another embodiment, the output signal of the branch sensor 16 includes a flow rate signal, which is used to detect leakage in the check valve 18. In yet another embodiment, the output signal of the branch sensor 16 includes both a pressure signal and a flow rate signal, which are used to detect leakage in the check valve 18. The preset range may include a first preset range and a second preset range. The first preset range is used for comparison with fluctuations in the pressure signal, and the second preset range is used for comparison with fluctuations in the flow rate signal. If the fluctuation of either the pressure signal or the flow rate signal exceeds the corresponding preset range, it can be determined that the check valve 18 is leaking. If the fluctuations of both the pressure signal and the flow rate signal do not exceed the corresponding preset range, it can be determined that the check valve 18 is not leaking.

[0070] The above steps can be repeated until all check valves 18 have been tested.

[0071] In some implementations, please refer to Figure 3 Step 101 includes:

[0072] Step 107: Divide all the terminal smoke hoods 12 on all floors into at least two smoke hood groups;

[0073] Step 109: Control one of the smoke hood units to turn on and the others to turn off.

[0074] This can improve efficiency.

[0075] Specifically, in one embodiment, the terminal smoke hoods 12 on all floors can be divided into two smoke hood groups. For example, the terminal smoke hoods 12 on odd-numbered floors can be designated as the first smoke hood group, and the terminal smoke hoods 12 on even-numbered floors can be designated as the second smoke hood group. During the detection process, all terminal smoke hoods 12 in the first smoke hood group can be turned on first, and the check valves 18 on the even-numbered floors can be detected simultaneously or one by one. After a period of time, the first smoke hood group is turned off, and after all branch sensors 16 have stabilized, the terminal smoke hoods 12 of the second smoke hood group are turned on. Similar to the above process, the output signals of the branch sensors 16 in the first smoke hood group are analyzed to detect the check valves 18 of the first smoke hood group.

[0076] For example, they can be grouped by floor number, with the terminal smoke machines 12 on floors 1-10 forming the first smoke machine group, the terminal smoke machines 12 on floors 11-20 forming the second smoke machine group, and the terminal smoke machines 12 on floors 21-30 forming the third smoke machine group, and so on. Alternatively, the terminal smoke machines 12 on half of the floors can be randomly assigned as the first smoke machine group, and the terminal smoke machines 12 on the other half of the floors as the second smoke machine group, and so on.

[0077] In other words, some terminal range hoods 12 can be controlled to open, creating positive pressure in the common flue 14. The fluctuation of the output signal of the branch sensor 16 corresponding to the terminal range hood 12 that is in the closed state is judged, and this process is repeated until all check valves 18 have been detected. Preferably, 10% or more of the total number of terminal range hoods 12 can be controlled to open to detect the corresponding check valves 18 of other terminal range hoods 12.

[0078] Please refer to Figure 4 A method for detecting leakage in a check valve 18 according to an embodiment of the present invention includes:

[0079] Step 111: Control the opening of a single terminal smoke machine 12 of the central smoke machine system 100, collect the output signal of the branch sensor 16 in real time, and keep the electric check valve 18 in the closed state for a preset time after opening. The output signal of the branch sensor 16 includes pressure signal and / or flow rate signal. The branch sensor 16 is located in the terminal flue 19 between the electric check valve 18 and the terminal smoke machine 12.

[0080] Step 113: After a preset time, control the electric check valve 18 to open;

[0081] Step 115: Compare the difference between the output signal of the branch sensor 16 acquired in real time and the preset reference signal;

[0082] Step 119: If the difference is greater than the preset difference, it is determined that the electric check valve 18 is leaking.

[0083] The above detection method compares the difference between the output signal of the branch sensor 16 acquired in real time and the preset reference signal, and determines that the electric check valve 18 is leaking when the difference is greater than the preset difference, thus realizing the detection of leakage of the check valve 18.

[0084] Specifically, after entering the leakage detection mode of check valve 18, a single-floor terminal smoke hood 12 can be turned on, and the corresponding electric check valve 18 is kept closed. After a preset time (e.g., after 5 seconds), the electric check valve 18 is then controlled to open, and the output signal changes of the branch sensor 16 are recorded in real time. The output signal changes of the branch sensor 16 corresponding to this floor are then uploaded to the control center 24, which compares the difference between the real-time collected sensor output signals and the preset reference signal. The terminal smoke hoods 12 are turned on floor by floor in this way for detection (only a single terminal smoke hood 12 is turned on in the entire building during each test).

[0085] A preset reference signal can be pre-calibrated and stored. Specifically, the preset reference signal can be built into the control center 24. During the initial installation of the prototype, a pre-test is performed by turning on the terminal smoke hood 12 and controlling the electric check valve 18 to open after a preset time (5 seconds later). The output signal data of the branch sensor 16 is collected and uploaded to the control center 24 as a reference signal for subsequent leak detection. In this embodiment of the invention, the control center 24 can control the opening and closing of the terminal smoke hood 12 and the electric check valve 18 respectively, and performs tests during initial installation. The preset difference can be determined based on the preset reference signal. Preferably, the branch sensor 16 is a pressure sensor.

[0086] Please refer to Figure 5 A method for detecting leakage in a check valve 18 according to an embodiment of the present invention includes:

[0087] Step 121: Collect the smoke concentration output by the smoke sensor;

[0088] Step 123: When the smoke concentration is greater than or equal to the preset concentration, control the terminal smoke machine 12 to turn on and keep the electric check valve 18 in the closed state for a preset time.

[0089] Step 125: If the smoke concentration is less than the preset concentration after a preset time, it is determined that the electric check valve 18 is leaking.

[0090] Step 127: If the smoke concentration is still greater than or equal to the preset concentration after a preset time, control the electric check valve 18 to open.

[0091] The above detection method detects leakage in the check valve 18 by detecting changes in smoke concentration when the electric check valve 18 is closed.

[0092] Specifically, automatic smoke extraction can be combined with leak detection of electric check valve 18. Smoke sensor can be installed in the kitchen. Preferably, smoke sensor is installed near the location where oil fumes are generated. For example, smoke sensor can be installed on the smoke collection hood of terminal range hood 12 or at the air inlet of terminal fan.

[0093] When the smoke sensor detects smoke, it outputs the smoke concentration. If the smoke concentration is greater than a preset concentration, the control center 24 determines that the terminal smoke hood 12 on this floor needs to be turned on. The control center 24 turns on the terminal smoke hood 12, but keeps the electric check valve 18 closed for a preset time (e.g., 5 seconds). After the preset time, the smoke sensor detects the smoke concentration again. If the smoke concentration is still greater than or equal to the preset concentration, the control center 24 is deemed to have a good seal and controls the electric check valve 18 to open for smoke extraction. If the smoke concentration is less than the preset concentration when detected again, the control center 24 is determined to be leaking. This implementation method does not require a built-in preset reference signal in the control center 24.

[0094] In some implementations, the detection method includes:

[0095] The range hood 12 is turned on according to the preset air volume control terminal.

[0096] In this way, the terminal smoke hood 12 can be controlled to start quickly.

[0097] Specifically, during testing, the control center 24 can send a preset air volume to the terminal exhaust fan 12, enabling the terminal exhaust fan 12 to quickly determine the speed of the terminal fan based on the preset air volume, thereby achieving rapid start-up of the terminal fan and improving testing efficiency. Moreover, the terminal exhaust fan 12, when turned on according to the preset air volume, can predict the time it takes for the pressure in the common flue 14 to rise to the pressure required for testing, which is beneficial for grasping the timing of testing and improving testing accuracy.

[0098] In some implementations, the detection method includes:

[0099] Mark the floor where check valve 18 is leaking;

[0100] After all check valves 18 have been inspected, all marked floors are summarized and users on the corresponding floors are notified to repair check valves 18.

[0101] This can prompt the user to perform maintenance.

[0102] Specifically, in the event of a leak in check valve 18, control center 24 can mark the corresponding floor. For example, if the test result for check valve 18 on the first floor indicates a leak, control center 24 marks the first floor as the leaking floor. After all check valves 18 have been tested, all marked floors are compiled, and the corresponding floor's users can then be provided with assistance in repairing the check valve 18.

[0103] There are many ways to display a message. In one embodiment, the terminal smoke hood 12 has a display screen, and the control center 24 can control the display screen of the corresponding terminal smoke hood 12 on the marked floor to display the words "Check valve 18 is leaking, please repair" or similar words.

[0104] In one embodiment, the terminal smoke hood 12 has a speaker, and the control center 24 can control the speaker of the terminal smoke hood 12 corresponding to the marked floor to play a voice message such as "Check valve 18 is leaking, please repair" or a similar message.

[0105] In one implementation, the control center 24 can send relevant prompts to user terminals that are communicatively connected to the control center 24, and the user terminals will then respond to the prompts. User terminals include, but are not limited to, mobile phones, tablets, personal computers, wearable smart devices, etc.

[0106] In some implementations, the detection method includes:

[0107] After all check valves 18 have been tested and no leakage is found, a message indicating no leakage will be displayed. This serves as a notification to the user that the check valves 18 are in normal working order.

[0108] Specifically, after all check valves 18 have been tested, the control center 24 can summarize all test results and determine whether there are any marked floors. If not, it indicates that there is no leakage in check valve 18, and the control center 24 will display a message indicating that there is no leakage in check valve 18.

[0109] There are many ways to display a message. In one implementation, the terminal range hood 12 has a display screen, and the control center 24 can control the display screens of all terminal range hoods 12 on all floors to display the message "No leakage from check valve 18, please use with confidence" or similar messages.

[0110] In one embodiment, the terminal smoke hood 12 has a speaker, and the control center 24 can control the speakers of the terminal smoke hoods 12 on all floors to play a voice message such as "No leakage from check valve 18, please use with confidence" or a similar message.

[0111] In one implementation, the control center 24 can send relevant prompts to user terminals that are communicatively connected to the control center 24, and the user terminals will then respond to the prompts. User terminals include, but are not limited to, mobile phones, tablets, personal computers, wearable smart devices, etc.

[0112] Please refer to Figure 6 A detection device 200 for leaking check valve 18 according to an embodiment of the present invention includes a processor 26 and a memory 28. The memory 28 stores a computer program, which, when executed by the processor 26, implements the steps of the detection method of any of the above embodiments.

[0113] Specifically, the detection device 200 may include a control center 24. The detection device 200 and the terminal smoke machine 12 can communicate wirelessly or via wired connection.

[0114] Please refer to Figure 6 A central smoke machine system 100 according to an embodiment of the present invention includes a leakage detection device 200 for the check valve 18 of the above embodiment.

[0115] The present invention provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor 26, implements the steps of the detection method of any of the above embodiments.

[0116] In one implementation, the steps of the check valve leakage detection method implemented by the computer program when executed by the processor 26 include:

[0117] Step 101: Control at least one terminal smoke hood 12 of the central smoke hood system 100 to turn on to exhaust air into the common smoke duct 14, and turn off the other terminal smoke hoods 12.

[0118] Step 103: Collect the output signal of the corresponding branch sensor 16 of the terminal smoke hood 12 in the closed state. The branch sensor 16 is located in the terminal flue 19 between the check valve 18 and the terminal smoke hood 12. The check valve 18 is connected to the common flue 14. The output signal of the branch sensor 16 includes pressure signal and / or flow rate signal.

[0119] Step 105: If the output signal fluctuation of the branch sensor 16 exceeds the preset range, it is determined that the check valve 18 of the terminal smoke hood 12, which is in the closed state, is leaking.

[0120] The aforementioned check valve leakage detection device 200, central smoke machine system, and computer-readable storage medium can detect leakage of check valve 18.

[0121] It should be noted that the explanation of the detection method and beneficial effects of the above-described embodiments also applies to the detection device 200, the central smoke machine system 100, and the computer-readable storage medium of the embodiments of the present invention. To avoid redundancy, they will not be elaborated in detail here.

[0122] In summary, the method, apparatus, and central smoke hood system 100 for detecting leakage of the check valve 18 according to the embodiments of the present invention have the following innovative features:

[0123] ① No additional accessories are required; the leak detection control logic of the check valve 18 of the distributed central smoke hood system 100 can be directly integrated into the control center 24.

[0124] The detection method utilizes the control of the terminal smoke machine 12 by the control center 24 and the acquisition of data from the branch sensor 16 by the control center 24. It collects relevant data and makes judgments and comparisons. This scheme can be directly coupled into the control center 24 and utilizes the hardware system of the central smoke machine system 100 without the need to install additional accessories.

[0125] ② Simple to operate and highly intelligent:

[0126] After entering the check valve 18 leak detection mode, the control center 24 issues opening commands to the odd-numbered floors and even-numbered floors in two separate steps. The control center 24 processes the output signals of the collected branch sensors 16 and returns the leak detection results based on the processing results (no floor leakage or direct notification to the relevant floor users for maintenance). The entire process is controlled independently by the center, without the need for manual operation. It has a high degree of intelligence and meets the intelligent positioning of the central smoke machine system 100.

[0127] ③ Applicable to all distributed central smoke control systems 100:

[0128] This leak detection method is based on the fundamental characteristics of the distributed central flue gas system 100, including unified control, closed-loop control of hardware feedback information, and positive pressure in the flue. It is independent of the terminal type and model, the presence or absence of the top fan 20, the model of the top fan 20, the model of the electric check valve 18, the bellows connection method, etc., and has extremely wide applicability.

[0129] It is understood that a computer program includes computer program code. Computer program code can be in the form of source code, object code, executable files, or certain intermediate forms. Computer-readable storage media can include: any entity or device capable of carrying computer program code, recording media, USB flash drives, external hard drives, magnetic disks, optical disks, computer memory, read-only memory (ROM), random access memory (RAM), and software distribution media, etc. The processor can be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc.

[0130] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with an embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0131] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A method for detecting leakage in a check valve, characterized in that, include: At least one terminal smoke hood of the central smoke hood system is turned on to exhaust air into the common smoke duct, while the other terminal smoke hoods are turned off. The output signals of the corresponding branch sensors of the terminal flue that are in the closed state are collected. The branch sensors are located in the terminal flue between the check valve and the terminal flue. The check valve is connected to the common flue. The output signals of the branch sensors include pressure signals and / or flow rate signals. If the output signal fluctuation of the branch sensor exceeds the preset range, it is determined that the corresponding check valve of the terminal smoke machine in the closed state is leaking.

2. The method for detecting leakage in a check valve according to claim 1, characterized in that, Controlling at least one terminal smoke hood of the central smoke hood system to turn on to exhaust air into the common smoke duct, and shutting off other terminal smoke hoods includes: Divide all the terminal smoke hoods on each floor into at least two smoke hood groups; Control one of the smoke generator units to turn on, and the others to turn off.

3. A method for detecting leakage in a check valve, characterized in that, include: The system controls the opening of a single terminal smoke machine in the central smoke machine system and the closing of other terminal smoke machines. It collects the output signals of the branch sensors of the opened terminal smoke machine in real time and keeps the electric check valve in a closed state for a preset time after opening. The output signals of the branch sensors include pressure signals and / or flow rate signals. The branch sensors are located in the terminal flue between the electric check valve and the terminal smoke machine. After the preset time period, the electric check valve is opened, and the changes in the output signal of the branch sensor are collected in real time. Compare the changes in the output signals of the branch sensors acquired in real time with the differences between the preset reference signals; If the difference is greater than a preset difference, the electric check valve is determined to be leaking.

4. The method for detecting leakage of a check valve according to any one of claims 1-3, characterized in that, The detection method includes: The terminal smoke hood is turned on according to the preset air volume control.

5. The method for detecting leakage in a check valve according to any one of claims 1-3, characterized in that, The detection method includes: Mark the floor where the check valve is leaking; After all check valves have been inspected, compile a list of all marked floors and remind the users on the corresponding floors to repair the check valves.

6. The method for detecting leakage of a check valve according to any one of claims 1-3, characterized in that, The detection method includes: After all check valves have been tested and no check valve leakage is found, a message indicating no check valve leakage will be displayed.

7. A device for detecting leakage in a check valve, characterized in that, include: processor; and A memory storing a computer program that, when executed by the processor, implements the steps of the detection method according to any one of claims 1-6.

8. A central smoke-making system, characterized in that, The device includes the check valve leakage detection device as described in claim 7.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the detection method according to any one of claims 1-6.

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