Refrigerant gas alarm and alarm control method thereof

Abstract

The invention discloses a refrigerant gas alarm and an alarm control method thereof, and the method comprises the steps: receiving a starting instruction, and judging whether a first current of a first gas pump and a second current of a second gas pump meet a preset starting condition or not; if the starting condition is met, a control instruction is sent to the first air pump, the second air pump and the three-way valve according to a preset alternate control strategy, so that the two air pumps alternately work, and the three-way valve is synchronously controlled to adjust the conduction direction; acquiring a detection value detected by the operational amplifier and judging whether a preset alarm condition is met or not; and if the alarm condition is met, sending a pull-in control instruction to the relay to control the relay to be pulled in and enable the alarm prompt assembly to be conducted to send out alarm prompt information. According to the method, through alternate control, the gas at different positions is conveyed to the gas chamber through the two gas pumps to be detected, alternate detection on the concentration of the refrigerant near the alarm and the ground is achieved, and whether the refrigerant leaks or not is rapidly and accurately detected.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sensors, in particular to a refrigerant gas alarm and an alarm control method thereof. BACKGROUND

[0002] In order to improve environmental performance, non-environmental refrigerants are usually replaced by environmentally friendly refrigerants. The current mainstream new environmentally friendly refrigerants (such as R32, R290, etc.) show significant thermodynamic performance advantages, and the energy efficiency is improved: under the same compression power condition, the refrigeration and heating efficiency is 8%-15% higher than that of traditional refrigerants, which can directly reduce the equipment operation energy consumption.

[0003] Although the new refrigerant has environmental and energy efficiency advantages, its physical properties also bring new safety challenges. Flammability risk: R32, R290 and R454B, etc. Mainstream substitutes belong to A2L or A3 flammable refrigerants, which have the risk of explosion under high temperature, high pressure or leakage accumulation conditions; Safety control needs: need to simultaneously strengthen the system sealing design, leakage monitoring and emergency disposal ability, and build a "prevention-monitoring-alarm-disposal" whole chain safety management system.

[0004] The main refrigerant detection principles at present are: metal oxide semiconductor (MOS), semiconductor technology is a gas detection technology based on the change of electrical properties of semiconductor materials. When the gas to be measured contacts the semiconductor at a certain temperature, an oxidation-reduction reaction occurs, which causes a change in the electrical properties of the semiconductor. By measuring the changes in electrical parameters such as resistance, current or voltage, the concentration of the gas can be confirmed. Semiconductor refrigerant leakage monitoring sensors have the advantages of simple design and low cost, but the long-term stability of MOS sensors is poor, and they can easily lose accuracy over time. Secondly, the selectivity of MOS sensors is poor, and they are easily affected by other volatile organic compounds (such as alcohol). If the air humidity changes, the detection results of semiconductor sensors will also be affected.

[0005] Thermal conductivity TC technology, thermal conductivity technology is based on the difference in thermal conductivity of different gases, which measures the change in heat conduction capacity when the gas flows through the heating element to determine the concentration, which has the advantages of simple structure, small size, low cost, and convenient maintenance, but the thermal conductivity refrigerant leakage monitoring sensor is easily affected by interfering gases due to its wide spectrum, which leads to false positives of the sensor. At the same time, because the lower limit of combustion / explosion of R290 gas is relatively low, the measurement sensitivity of the thermal conductivity refrigerant leakage monitoring sensor to R290 gas in the lower limit of combustion / explosion is low, which makes it have certain limitations in refrigerant leakage monitoring applications.

[0006] Non-dispersive infrared (NDIR) technology is a technology for measuring gas concentration by using the absorption characteristics of a gas to specific wavelength infrared light. Different types of refrigerant gas can be detected by selecting the corresponding characteristic absorption band. NDIR technology has the advantages of good selectivity, strong anti-interference ability, high detection accuracy, long service life, and high reliability. The gas selectivity of NDIR sensors is high, and they do not react to interfering substances other than the target gas. NDIR sensors have high detection accuracy, good stability, and long service life. Based on these characteristics, the use of NDIR technology by air conditioner manufacturers has gradually increased in recent years.

[0007] In combination with the operating characteristics of air conditioning systems and the physical properties of refrigerants, the current refrigerant alarm installation location has the following core limitations in actual application: insufficient detection range coverage; single-point monitoring cannot match complex leakage scenarios; current alarms are mostly installed at fixed single points (such as air conditioner return air inlets and walls next to indoor units), and their effective detection radius is usually only 1-3 meters, covering only the local area around the installation point. The leakage points of air conditioning refrigeration systems can be distributed in multiple locations such as indoor and outdoor unit connection pipelines, valve interfaces, evaporators, and condensers, and the pipeline route can extend along hidden paths such as walls and suspended ceilings. When the leakage point is far from the alarm (such as the outdoor unit pipeline and the connection valve near the ground), the refrigerant needs to diffuse to the sampling port through air convection. If the space airflow is complex (such as suspended ceiling barriers and furniture obstructions), it can cause detection blind spots and fail to capture the leakage signal in a timely manner. The fixed single-point installation logic of the refrigerant alarm is fundamentally contradictory to the randomness of air conditioning system leakage points, the physical properties of refrigerants (sinking and low diffusion rate), and the complexity of space airflow, making it difficult to meet the monitoring requirements of "full coverage, high sensitivity, and no delay" in actual application. Therefore, the refrigerant alarm used in the prior art has the problem of small detection range. SUMMARY

[0008] The embodiments of the present application provide a refrigerant gas alarm and an alarm control method thereof, aiming to solve the problem of small detection range of the refrigerant alarm used in the prior art.

[0009] In a first aspect, the embodiments of the present application provide an alarm control method, wherein the method is applied to a microprocessor of a refrigerant gas alarm, the microprocessor is in communication connection with a first gas pump, a second gas pump, a three-way valve, an infrared light source, an operational amplifier, and a relay configured in the refrigerant gas alarm to realize transmission of data information, and the method comprises the following steps: receiving a start instruction, and judging whether a first current of the first gas pump and a second current of the second gas pump meet a preset start condition; if the start condition is met, sending a control instruction to the first gas pump, the second gas pump, and the three-way valve according to a preset alternating control strategy, so that the two gas pumps work alternately and the three-way valve adjusts the conduction direction synchronously. acquire the detection value detected by the operational amplifier and determine whether a preset alarm condition is met; If the alarm condition is met, send a suction control instruction to the relay to control the relay to be attracted and make the alarm prompt component conductive to send alarm prompt information.

[0010] In a second aspect, the embodiments of the present application further provide a refrigerant gas alarm, wherein the refrigerant gas alarm comprises a shell, a first air pump, a second air pump, a three-way valve, an air chamber, an alarm prompt component, a relay, a relay adapter and a button arranged in the shell. The air inlet of the first air pump is connected to a first air inlet pipe, and the first air inlet pipe extends downward from the shell; the air inlet of the second air pump is connected to a second air inlet pipe, and the second air inlet pipe extends downward from the shell, and the length of the first air inlet pipe extending downward is greater than the length of the second air inlet pipe extending downward. The air outlet of the first air pump is connected to one inlet of the three-way valve through a first air outlet pipe; the air outlet of the second air pump is connected to another inlet of the three-way valve through a second air outlet pipe, and the outlet of the three-way valve is connected to the air inlet joint of the air chamber through an air chamber air inlet pipe. An infrared light source and an infrared detector are arranged on the opposite two side walls of the air chamber, respectively; a waterproof air permeable film is arranged on the inner wall of the side of the air chamber away from the air inlet joint; an operational amplifier is electrically connected to the infrared detector; the infrared light source, the operational amplifier, the alarm prompt component, the button, the first air pump, the second air pump and the three-way valve are electrically connected to a main control board, respectively; the microprocessor is arranged on the main control board, and the relay is electrically connected to the main control board through the relay adapter. The microprocessor is used to execute the alarm control method of the first aspect.

[0011] In a third aspect, the embodiments of the present application further provide a computer device, wherein the device comprises a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory complete communication with each other through the communication bus. The memory is used to store a computer program. The processor is used to execute the program stored on the memory, and realize the steps of the alarm control method of the first aspect.

[0012] In a fourth aspect, the embodiments of the present application further provide a computer readable storage medium, which stores a computer program, wherein the computer program is executed by the processor to realize the steps of the alarm control method of the first aspect.

[0013] This invention provides a refrigerant gas alarm and its alarm control method. The method includes: receiving a start command; determining whether the first current of the first air pump and the second current of the second air pump meet preset start conditions; if the start conditions are met, sending control commands to the first air pump, the second air pump, and the three-way valve according to a preset alternating control strategy, so that the two air pumps work alternately and synchronously control the three-way valve to adjust its conduction direction; acquiring the detection value detected by the operational amplifier and determining whether it meets preset alarm conditions; if the alarm conditions are met, sending a pull-in control command to the relay, so as to control the relay to pull in and cause the alarm prompt component to conduct and issue an alarm prompt message. The above method, through alternating control, allows gas from different locations to be delivered to the gas chamber for detection via the first and second air pumps, achieving alternating detection of refrigerant concentration near the alarm and near the ground, and quickly and accurately detecting whether refrigerant leakage has occurred. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a flowchart of an alarm control method provided in an embodiment of the present invention; Figure 2 This is a schematic diagram illustrating an application scenario of the alarm control method provided in an embodiment of the present invention; Figure 3 A structural diagram of the refrigerant gas alarm device provided in an embodiment of the present invention; Figure 4 This is a schematic block diagram of a computer device provided in an embodiment of the present invention; Figure labels: 1. Outer casing; 11. First filter; 12. First air inlet pipe; 15. First air outlet pipe; 16. First air pump; 17. First one-way valve; 21. Second filter; 22. Second air inlet pipe; 23. Second air pump; 24. Second air outlet pipe; 25. Second one-way valve; 31. Three-way valve; 32. Air chamber inlet pipe; 41. Air inlet connector; 42. Air chamber; 43. Infrared light source; 44. Infrared detector; 45. Operational amplifier; 51. Three-color indicator light; 61. Buzzer; 71. Relay; 72. Adapter board; 81. Button; 9. Main control board; 91. Microprocessor. Detailed Implementation

[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0018] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0019] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0020] Please see Figure 1 As shown in the figure, an embodiment of this invention provides an alarm control method. This method is applied in a microprocessor 91 and is executed by application software installed in the microprocessor 91, such as... Figure 2As shown, the microprocessor 91 communicates with the first air pump 16, the second air pump 23, the three-way valve 31, the infrared light source 43, the operational amplifier 45, and the relay 71 configured in the refrigerant gas alarm to transmit data information. The alarm is installed on a wall at a certain height (e.g., 1.5 meters above the ground). The first air pump 16 is used to extract gas near the ground and deliver it to the gas chamber 42, and the second air pump 23 is used to extract gas near the alarm and deliver it to the gas chamber 42. The alarm is installed on a wall at a certain height. An infrared light source 43 and an infrared detector 44 are installed in the gas chamber 42. The concentration of refrigerant in the gas chamber 42 affects the intensity of infrared light propagating to the infrared detector. The infrared detector 44 detects the intensity of infrared light to obtain a detection signal; the detection signal is input to the operational amplifier 45 to obtain the corresponding detection value. Relay 71 receives control commands from microprocessor 91 and controls the on / off state of the circuit corresponding to the alarm component. When relay 71 is energized, it connects the circuit corresponding to the alarm component, powering it on. When relay 71 is reset, it disconnects the circuit, disabling the alarm component. Microprocessor 91 can be a component with data processing and command transmission / reception capabilities, such as an MCU chip or FPGA chip. The power input section consists of a DC-DC step-down converter, an LDO circuit, a power and communication interface, and a relay interface. It supplies power to all circuits, receives air conditioning cooling signals, outputs alarm signals, and reports the current status.

[0021] like Figure 1 As shown, the method includes steps S110 to S140.

[0022] S110. Receive the start command and determine whether the first current of the first air pump and the second current of the second air pump meet the preset start conditions.

[0023] If the microprocessor receives a start command, it executes a self-test program. Upon receiving the air conditioner cooling signal, the power input section outputs a start command to the microprocessor. When the first and second air pumps are powered on simultaneously, the microprocessor obtains the first current of the first air pump and the second current of the second air pump, and determines whether the first and second currents meet the preset start conditions.

[0024] In a specific embodiment, step S110 includes the following sub-steps: determining whether the first current and the second current are both within the current judgment interval of the start-up condition; if the first current and the second current are both within the current judgment interval, determining that the start-up condition is met; if the first current or the second current is not within the current judgment interval, determining that the start-up condition is not met.

[0025] If the motor inside the air pump malfunctions, the corresponding current value will also be abnormal. Since the air pumps need to run alternately in subsequent steps, to improve the reliability of air pump operation and avoid continuing subsequent testing steps if an air pump malfunctions, it can be determined whether the first current of the first air pump and the second current of the second air pump are both within the current judgment interval specified in the starting conditions. The lower limit of the current judgment interval is set to a value greater than zero, and the upper limit is set to the motor's stall current. If the air pump current is less than the lower limit of the current judgment interval, it indicates that the air pump circuit may be open; if the air pump current is greater than the upper limit of the current judgment interval, it indicates that the air pump motor may be stuck.

[0026] If both the first current and the second current are within the current judgment interval, the starting condition is determined to be met; if they are not both within the current judgment interval, the starting condition is determined not to be met.

[0027] S120. If the starting conditions are met, control commands are sent to the first air pump, the second air pump, and the three-way valve according to a preset alternating control strategy, so that the two air pumps work alternately and the three-way valve is controlled synchronously to adjust the conduction direction.

[0028] Furthermore, if the start-up conditions are met, control commands are sent to the first air pump, the second air pump, and the three-way valve according to the alternating control strategy, causing the two air pumps to operate alternately. Simultaneously, the three-way valve is controlled to adjust its conduction direction. The three-way valve has two inlets and one outlet, so at any given time, it can only control one inlet to be open, enabling airflow between one inlet and one outlet. If the first air pump is operating, the three-way valve adjusts its conduction direction to open the pipeline for the first air pump; if the second air pump is operating, the three-way valve adjusts its conduction direction to open the pipeline for the second air pump. If the start-up conditions are not met, the step of controlling the alternating operation of the two air pumps is not executed.

[0029] In a specific embodiment, before sending control commands to the first air pump, the second air pump, and the three-way valve according to a preset alternating control strategy, the method further includes: determining whether the resistance detection current of the infrared light source is within a preset current detection range; obtaining the initial value detected by the operational amplifier and determining whether the initial value is within a preset signal range; if the resistance detection current is within the current detection range and the initial value is within the signal range, then executing the step of sending control commands to the first air pump, the second air pump, and the three-way valve according to the preset alternating control strategy.

[0030] Specifically, to further improve the reliability of the alarm, before controlling the two air pumps to work alternately, the resistance detection current of the infrared light source can be obtained. This resistance detection current can be obtained by detecting the sampling resistance when the infrared light source is lit, and it can be determined whether the resistance detection current is within a preset current detection range. If the resistance detection current is within the current detection range, it indicates that the infrared light source is working normally and is not damaged; if the resistance detection current is not within the current detection range, it indicates that the infrared light source is malfunctioning or damaged.

[0031] The initial value detected by the operational amplifier is then obtained, and it is determined whether the initial value is within the preset signal range. Since neither the first nor the second air pump is running at this time, and the air chamber is filled with ordinary air, the initial value detected by the operational amplifier should be equivalent to the refrigerant concentration of the detected ordinary air. Therefore, the signal range can be set accordingly based on the refrigerant concentration of the detected ordinary air. For example, if the refrigerant concentration of the detected ordinary air is 0.1 mg / m³... 3 The signal range can then be set to [0, 0.5], with the unit also being mg / m³. 3 .

[0032] If the initial value is within the signal range, it indicates that there is no difference in the detected initial value; if the initial value is not within the signal range, it indicates that there is a difference in the detected initial value.

[0033] If the resistance-detected current is within the current detection range and the initial value is within the signal range, the subsequent steps can be executed. If the resistance-detected current is not within the current detection range, or the initial value is not within the signal range, it indicates that the alarm is malfunctioning; in this case, the subsequent steps should not be executed, and a restart command can be issued to restart the alarm.

[0034] In a specific embodiment, step S120 includes the following sub-steps: sending an opening command to the first air pump and simultaneously sending a first conduction command to the three-way valve, so that the three-way valve conducts the pipeline connected to the first air pump; if a first cycle time set in the alternating control strategy elapses after the opening command is sent, sending a closing command to the first air pump; sending an opening command to the second air pump and simultaneously sending a second conduction command to the three-way valve, so that the three-way valve conducts the pipeline connected to the second air pump; if a first cycle time set in the alternating control strategy elapses after the opening command is sent, sending a closing command to the second air pump, and returning to execute the step of sending an opening command to the first air pump and simultaneously sending a first conduction command to the three-way valve.

[0035] Specifically, after determining that both air pumps meet the start-up conditions, they are in a non-operating state. At this time, an start command can be sent to the first air pump, and simultaneously a first conduction command can be sent to the three-way valve. The three-way valve then conducts the flow through the pipeline connected to the first air pump. The first air pump extracts gas from the ground area and delivers it to the air chamber through the pipeline connected to the first air pump and the three-way valve. At this time, the air chamber can detect the refrigerant concentration in the ground area. If an start command is sent, and after the first cycle time has elapsed, a stop command can be sent to the first air pump, at which point the first air pump stops operating.

[0036] Afterwards, an activation command is sent to the second air pump, and a second conduction command is sent to the three-way valve. The three-way valve then conducts the pipeline connected to the second air pump. The second air pump draws gas from the vicinity of the alarm and delivers it to the gas chamber through the pipeline connected to the second air pump and the three-way valve. At this time, the gas chamber can detect the refrigerant concentration near the alarm. After sending the activation command and waiting for the second cycle time, a shutdown command can be sent to the second air pump. If no refrigerant leak is detected, the above steps of alternately activating the two air pumps are repeated. The second cycle time can be equal to or different from the first cycle time. The total duration of one detection cycle is S = T1 + T2, where T1 is the first cycle time and T2 is the second cycle time. Since the pipeline of the first air pump is longer, T1 can be set to > T2 during time application.

[0037] S130. Obtain the detection value detected by the operational amplifier and determine whether the preset alarm conditions are met.

[0038] The detection value obtained from the operational amplifier is acquired. The acquired detection value is the refrigerant concentration in the ground area or the refrigerant concentration near the alarm. It can be determined whether the detection value meets the alarm conditions.

[0039] In a specific embodiment, step S130 includes the following sub-steps: determining whether the detected value exceeds the alarm threshold in the alarm conditions; if the detected value does not exceed the alarm threshold, determining whether the mutation amount corresponding to the detected value exceeds the mutation amount threshold in the alarm conditions; if the detected value exceeds the alarm threshold or the mutation amount exceeds the mutation amount threshold, determining that the alarm conditions are met; if the mutation amount does not exceed the mutation amount threshold, determining that the alarm conditions are not met.

[0040] Specifically, it can be determined whether the detected value exceeds the alarm threshold set in the alarm conditions. The alarm threshold is the concentration threshold corresponding to refrigerant leakage. If the detected value does not exceed the alarm threshold, it can be further determined whether the change in the detected value exceeds the change threshold in the alarm conditions. The change is the difference between the current detected value and the previous detected value. If the current detected value increases significantly compared to the previous detected value, the change exceeds the change threshold, indicating a significant increase in refrigerant leakage, thus meeting the alarm conditions. The change threshold can be set to a value less than the alarm threshold. For example, if the alarm threshold is set to P0, the change threshold can be set to P0 / 2 or P0 / 3.

[0041] If the detected value exceeds the alarm threshold, or the change in the detected value exceeds the change threshold, the alarm condition is deemed met. If the detected value does not exceed the alarm threshold, and the change in the detected value does not exceed the change threshold, the alarm condition is deemed not met.

[0042] S140. If the alarm conditions are met, a pull-in control command is sent to the relay to control the relay to pull in and cause the alarm prompt component to conduct and issue an alarm prompt message.

[0043] If the alarm conditions are met, a energizing control command is sent to the relay, which then energizes according to the command. The relay is connected in series in the circuit of the alarm indicator component; when the relay is energized, the alarm indicator component is powered on and issues an alarm message. After sending the energizing control command to the relay, the microcontroller can send shutdown commands to the first and second air pumps respectively to stop both pumps from operating.

[0044] The alarm prompt components include a three-color indicator light and a buzzer. When the relay is activated, the three-color indicator light will flash red, and the buzzer will sound an alarm at the same time.

[0045] In a specific embodiment, the microprocessor also communicates with the button configured in the refrigerant gas alarm. After step S140, the step further includes: if a button command is received from the button, a reset control command is sent to the relay to control the relay to reset and disconnect the electrical connection of the alarm prompt component.

[0046] Furthermore, the alarm is equipped with buttons. Users can press these buttons to generate a command, which is then sent to the microprocessor. Upon receiving this command, the microprocessor performs a reset operation, allowing users to manually reset the device by pressing the button. When the microprocessor receives the command from the button, it sends a reset control command to the relay. This resets the relay and disconnects the electrical connection to the alarm indicator component, preventing it from issuing any alarm messages.

[0047] In a specific embodiment, after sending the reset control command to the relay, the method further includes: returning to the step of determining whether the first current of the first air pump and the second current of the second air pump meet the preset start-up conditions.

[0048] After the microprocessor sends a reset control command to the relay, the microprocessor can execute the above step S110 again to realize the automatic execution of the self-test program after reset, and realize the cyclic detection of refrigerant concentration.

[0049] The alarm control method disclosed in the above embodiments includes: receiving a start command; determining whether the first current of the first air pump and the second current of the second air pump meet preset start conditions; if the start conditions are met, sending a control command to the first air pump, the second air pump, and the three-way valve according to a preset alternating control strategy, so that the two air pumps work alternately and synchronously control the three-way valve to adjust the conduction direction; acquiring the detection value detected by the operational amplifier and determining whether it meets preset alarm conditions; if the alarm conditions are met, sending a pull-in control command to the relay, so as to control the relay to pull in and cause the alarm prompt component to conduct and issue an alarm prompt message. The above method, through alternating control, allows gas from different locations to be delivered to the gas chamber for detection via the first and second air pumps, achieving alternating detection of refrigerant concentration near the alarm and near the ground, and quickly and accurately detecting whether refrigerant leakage has occurred.

[0050] This invention also provides a refrigerant gas alarm, such as... Figure 2 and Figure 3As shown, the refrigerant gas alarm includes a housing 1 and a first air pump 16, a second air pump 23, a three-way valve 31, a gas chamber 42, an alarm indicator component, a relay 71, an adapter plate 72, and a button 81 disposed within the housing 1. The air inlet of the first air pump 16 is connected to a first air inlet pipe 12, which extends downward from the housing. The air inlet of the second air pump 23 is connected to a second air inlet pipe 22, which extends downward from the housing, and the length of the first air inlet pipe 12 is greater than the length of the second air inlet pipe 22. The air outlet of the first air pump 16 is connected to one inlet of the three-way valve 31 via a first air outlet pipe 15. The air outlet of the second air pump 23 is connected to the other inlet of the three-way valve 31 via a second air outlet pipe 24. The outlet of the three-way valve 31 is connected to the air inlet connector 41 of the air chamber 42 through the air inlet pipe 32; the infrared light source 43 and the infrared detector 44 are respectively disposed on two opposite side walls of the air chamber 42; the inner wall of the air chamber 42 away from the air inlet connector 41 is provided with a waterproof and breathable membrane; the operational amplifier 45 is electrically connected to the infrared detector 44; the infrared light source 43, the operational amplifier 45, the alarm prompt component, the button 81, the first air pump 16, the second air pump 23 and the three-way valve 31 are respectively electrically connected to the main control board 9; the microprocessor 91 is disposed on the main control board 9; the relay 71 is electrically connected to the main control board 9 through the adapter board 72; the microprocessor 91 is used to execute the alarm control method as described in the above embodiments.

[0051] In a more specific embodiment, a first one-way valve 17 and a second one-way valve 25 are respectively provided at the two inlets of the three-way valve 31; a first filter 11 and a second filter 21 are respectively provided at the end of the first air intake pipe 12 and the end of the second air intake pipe 22. The alarm indicator component includes a three-color indicator light 51 and a buzzer 61.

[0052] During operation, the power input section provides a stable voltage. The microprocessor 91 controls the infrared light source 43 to modulate the operation and simultaneously detects the output voltage of the infrared detector 44 after passing through the operational amplifier 45. The output voltage of the infrared detector 44 decreases as the refrigerant concentration increases. The microprocessor 91 controls the operation of the first air pump 16 and the duration of the first air pump 16's pipeline being open is T1. The refrigerant concentration detected within T1 is determined to be the refrigerant concentration at the inlet of the first air intake pipe 12 connected to the first air pump 16. After T1, the first air pump 16 is turned off, the second air pump 23 is turned on, and the pipeline of the first air pump 16 is opened. The second air pump 23 operates for T2. The refrigerant concentration detected within T2 is the refrigerant concentration at the inlet of the second air intake pipe 22 connected to the second air pump 23. The detection cycle S = T1 + T2. Within one detection cycle, the refrigerant concentration near the alarm and near the ground can be detected simultaneously, achieving the purpose of quickly and accurately detecting refrigerant leaks.

[0053] like Figure 3 As shown, during the T1 time period of the detection cycle, the second air pump 23 stops running and the first air pump 16 starts working; at this time, air passes through the first filter 11, the first air inlet pipe 12, the first air pump 16, the first air outlet pipe 15, the first one-way valve 17, the three-way valve 31, the air chamber inlet pipe 32, and the air inlet connector 41 to enter the air chamber 42, and the gas in the air chamber 42 is discharged through the waterproof and breathable membrane. At this time, the second one-way valve 25 is closed, the pipeline corresponding to the second air pump 23 is sealed, and gas will not flow out through the second one-way valve 25. All the gas delivered by the first air pump 16 enters the gas chamber 42. After the gas fills the gas chamber 42, it is discharged from the rear waterproof and breathable membrane. At this time, the refrigerant concentration detected is the concentration at the inlet of the first air inlet pipe 12 connected to the first air pump 16. During the T2 time period of the detection cycle, the first air pump 16 stops running, and the second air pump 23 starts working. At this time, air passes through the second filter 21, the second air inlet pipe 22, the second air pump 23, the second air outlet pipe 24, the second one-way valve 25, the three-way valve 31, the gas chamber inlet pipe 32, and the inlet connector 41 to enter the gas chamber 42. After the gas fills the gas chamber 42, it is discharged from the rear waterproof and breathable membrane. At this time, the refrigerant concentration detected is the concentration at the inlet of the second air inlet pipe 22 connected to the second air pump 23. Therefore, setting the first one-way valve 17 and the second one-way valve 25 can prevent the phenomenon of gas backflow, thereby improving the accuracy and reliability of the detection. The first filter 11 and the second filter 21 are set to filter particulate matter in the gas to prevent particulate matter from entering the gas chamber 42 and affecting the detection accuracy, or even causing the alarm to be damaged.

[0054] The tri-color indicator light 51 consists of a green LED indicator, a yellow LED indicator, and a red LED indicator. The green, yellow, and red LED indicators respectively indicate the alarm's normal operation, lifespan / self-test, and refrigerant leak alarm status. The buzzer 61 can emit a warning sound greater than 75dB and less than 115dB at a distance of 1m when there is a refrigerant leak. The relay 71 is placed on its side and connected to the main control board 9 via the adapter board 72, which can effectively reduce the thickness of the outer casing 1, making the product more space-saving and aesthetically pleasing. The button 81 can realize manual reset or self-test functions when the high concentration alarm is cleared.

[0055] The refrigerant gas alarm provided in this embodiment of the invention applies the above-described alarm control method. It receives a start command and determines whether the first current of the first pump and the second current of the second pump meet preset start conditions. If the start conditions are met, a control command is sent to the first pump, the second pump, and the three-way valve according to a preset alternating control strategy, so that the two pumps work alternately and the three-way valve is synchronously controlled to adjust its conduction direction. The detection value detected by the operational amplifier is acquired and it is determined whether the preset alarm conditions are met. If the alarm conditions are met, a pull-in control command is sent to the relay to control the relay to pull in and cause the alarm prompt component to conduct and issue an alarm prompt message. This method, through alternating control, allows gas from different locations to be delivered to the gas chamber for detection via the first and second pumps, achieving alternating detection of refrigerant concentration near the alarm and near the ground, and quickly and accurately detecting whether refrigerant leakage has occurred.

[0056] The above-mentioned alarm control method can be implemented as a computer program, which can be used in, for example... Figure 4 It runs on the computer device shown.

[0057] Please see Figure 4 , Figure 4 This is a schematic block diagram of a computer device provided in an embodiment of the present invention. The computer device may be a microprocessor used to execute an alarm control method to control a refrigerant gas alarm.

[0058] See Figure 4 The computer device 500 includes a processor 502, a memory, and a communication interface 505 connected via a communication bus 501. The memory may include a storage medium 503 and internal memory 504.

[0059] The storage medium 503 may store an operating system 5031 and a computer program 5032. When the computer program 5032 is executed, it causes the processor 502 to execute an alarm control method. The storage medium 503 may be a volatile storage medium or a non-volatile storage medium.

[0060] The processor 502 provides computing and control capabilities to support the operation of the entire computer device 500.

[0061] The internal memory 504 provides an environment for the operation of the computer program 5032 in the storage medium 503. When the computer program 5032 is executed by the processor 502, the processor 502 can execute an alarm control method.

[0062] This communication interface 505 is used for network communication, such as providing data transmission. Those skilled in the art will understand that... Figure 4 The structure shown is merely a block diagram of a portion of the structure related to the present invention and does not constitute a limitation on the computer device 500 to which the present invention is applied. The specific computer device 500 may include more or fewer components than shown in the figure, or combine certain components, or have different component arrangements.

[0063] The processor 502 is used to run the computer program 5032 stored in the memory to implement the corresponding functions in the alarm control method described above.

[0064] Those skilled in the art will understand that Figure 4 The embodiments of the computer device shown do not constitute a limitation on the specific configuration of the computer device. In other embodiments, the computer device may include more or fewer components than illustrated, or combine certain components, or have different component arrangements. For example, in some embodiments, the computer device may include only memory and a processor. In such embodiments, the structure and function of the memory and processor are different from those shown. Figure 4 The embodiments shown are consistent and will not be described again here.

[0065] It should be understood that, in this embodiment of the invention, the processor 502 may be a Central Processing Unit (CPU), or it may be 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. The general-purpose processor may be a microprocessor or any conventional processor.

[0066] In another embodiment of the invention, a computer-readable storage medium is provided. This computer-readable storage medium may be volatile or non-volatile. The computer-readable storage medium stores a computer program, which, when executed by a processor, implements the steps included in the alarm control method described above.

[0067] Those skilled in the art will readily understand that, for the sake of convenience and brevity, the specific working processes of the devices, apparatuses, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here. Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in terms of function in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this invention.

[0068] In the embodiments provided by this invention, it should be understood that the disclosed devices, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative. For instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. Units with the same function may be grouped into one unit. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. In addition, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interfaces, devices, or units, or it may be an electrical, mechanical, or other form of connection.

[0069] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of the embodiments of the present invention, depending on actual needs.

[0070] Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0071] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a computer-readable storage medium and includes several instructions to cause a computer device to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned computer-readable storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), magnetic disks, or optical disks.

[0072] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. An alarm control method, characterized in that, The method is applied to a microprocessor in a refrigerant gas alarm, wherein the microprocessor is communicatively connected to a first gas pump, a second gas pump, a three-way valve, an infrared light source, an operational amplifier, and a relay configured in the refrigerant gas alarm to achieve data transmission; the method includes: Upon receiving the start command, determine whether the first current of the first air pump and the second current of the second air pump meet the preset start conditions. If the start-up conditions are met, control commands are sent to the first air pump, the second air pump, and the three-way valve according to the preset alternating control strategy, so that the two air pumps work alternately and the three-way valve is controlled synchronously to adjust the conduction direction. The detection value detected by the operational amplifier is obtained and it is determined whether the preset alarm conditions are met. If the alarm conditions are met, a pull-in control command is sent to the relay to control the relay to pull in and cause the alarm prompt component to conduct and issue an alarm prompt message.

2. The alarm control method according to claim 1, characterized in that, The step of determining whether the first current of the first air pump and the second current of the second air pump meet the preset start-up conditions includes: Determine whether both the first current and the second current are within the current determination interval of the start-up conditions; If both the first current and the second current are within the current judgment interval, the starting condition is determined to be met. If the first current or the second current is not within the current judgment interval, it is determined that the start-up condition is not met.

3. The alarm control method according to claim 1, characterized in that, Before sending control commands to the first air pump, the second air pump, and the three-way valve according to a preset alternating control strategy, the method further includes: Determine whether the resistance detection current of the infrared light source is within a preset current detection range; Obtain the initial value detected by the operational amplifier and determine whether the initial value is within a preset signal range; If the resistance detection current is within the current detection range and the initial value is within the signal range, the step of sending control commands to the first air pump, the second air pump, and the three-way valve according to the preset alternating control strategy is executed.

4. The alarm control method according to claim 1, characterized in that, The step of acquiring the detection value detected by the operational amplifier and determining whether the preset alarm conditions are met includes: Determine whether the detected value exceeds the alarm threshold in the alarm conditions; If the detected value does not exceed the alarm threshold, determine whether the mutation amount corresponding to the detected value exceeds the mutation amount threshold in the alarm condition; If the detected value exceeds the alarm threshold or the mutation amount exceeds the mutation amount threshold, the alarm condition is determined to be met. If the mutation amount does not exceed the mutation amount threshold, it is determined that the alarm condition is not met.

5. The alarm control method according to claim 1, characterized in that, The step of sending control commands to the first air pump, the second air pump, and the three-way valve according to a preset alternating control strategy includes: A start command is sent to the first air pump, and a first conduction command is simultaneously sent to the three-way valve, so that the three-way valve conducts the pipeline connected to the first air pump; If the first cycle time set in the alternating control strategy elapses after the start command is sent, a stop command is sent to the first air pump. A start command is sent to the second air pump, and a second conduction command is simultaneously sent to the three-way valve, so that the three-way valve conducts the pipeline connected to the second air pump; If, after the start command is sent, the first cycle time set in the alternating control strategy has elapsed, a stop command is sent to the second air pump, and the process returns to the step of sending the start command to the first air pump and simultaneously sending the first conduction command to the three-way valve.

6. The alarm control method according to claim 1, characterized in that, The microprocessor also communicates with the buttons configured in the refrigerant gas alarm. After sending the activation control command to the relay, the process further includes: If a key press command is received from the key, a reset control command is sent to the relay to control the relay to reset and disconnect the electrical connection of the alarm prompt component.

7. The alarm control method according to claim 6, characterized in that, After sending the reset control command to the relay, the method further includes: Return to the step of determining whether the first current of the first air pump and the second current of the second air pump meet the preset start-up conditions.

8. A refrigerant gas alarm, characterized in that, The refrigerant gas alarm includes a housing and a first air pump, a second air pump, a three-way valve, a gas chamber, an alarm indicator component, a relay, an adapter plate, and buttons disposed within the housing; The air inlet of the first air pump is connected to a first air inlet pipe, which extends downward from the outer casing; the air inlet of the second air pump is connected to a second air inlet pipe, which extends downward from the outer casing, and the length of the first air inlet pipe extending downward is greater than the length of the second air inlet pipe extending downward. The outlet of the first air pump is connected to one inlet of the three-way valve through a first air outlet pipe; the outlet of the second air pump is connected to the other inlet of the three-way valve through a second air outlet pipe; and the outlet of the three-way valve is connected to the air inlet connector of the air chamber through an air chamber inlet pipe. An infrared light source and an infrared detector are respectively disposed on two opposite side walls of the air chamber; the inner wall of the air chamber away from the air inlet is provided with a waterproof and breathable membrane; an operational amplifier is electrically connected to the infrared detector; the infrared light source, the operational amplifier, the alarm indicator component, the button, the first air pump, the second air pump, and the three-way valve are respectively electrically connected to the main control board; the microprocessor is disposed on the main control board; and the relay is electrically connected to the main control board through an adapter board. The microprocessor is used to execute the alarm control method as described in any one of claims 1-7.

9. The refrigerant gas alarm according to claim 8, characterized in that, The three-way valve is equipped with a first check valve and a second check valve at its two inlets, respectively. The first air intake pipe and the second air intake pipe are respectively provided with a first filter and a second filter.

10. The refrigerant gas alarm according to claim 8 or 9, characterized in that, The alarm notification component includes a three-color indicator light and a buzzer.

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