A gas interference simulation device and method for testing a gas alarm

Abstract

The application discloses a kind of gas interference simulation device and method for gas alarm testing, belong to gas detection technical field, including detection box, gas alarm is placed in detection box, first gas inlet is opened in the top surface of detection box, exhaust port and the sealing plug that is adapted to the exhaust port are arranged in the side surface of detection box, multifunctional gas analyzer is fixedly installed in detection box, further including: interference device, interference device is fixedly installed in detection box, interference device is used to detect whether the alarm sound of gas alarm is emitted in each specified concentration under interference gas environment, methane is transported from first gas inlet to suction box, cylinder pushes first piston plate to extrude gas into first gas pipe and into detection box, multifunctional gas analyzer detects that methane concentration reaches (5000±50) ppm, whether gas alarm emits alarm signal is observed, then whether stop alarm after two minutes of emptying methane gas through exhaust port, to determine whether gas alarm is qualified.

Description

Technical Field

[0001] This invention relates to the field of gas detection technology, and in particular to a gas interference simulation device and method for testing gas alarms. Background Technology

[0002] The alarm performance of combustible gas detectors can be compromised by interfering gases in the environment (such as acetic acid gas produced during cooking), leading to false alarms or damage to the detector and rendering it ineffective, posing a threat to life and property. Therefore, to test the reliability and accuracy of alarms in complex environments, it is necessary to conduct tests simulating interfering gas environments. Currently, gas transfer devices are used to move the required gas into the test chamber to achieve the testing purpose. Since changes in the volume of the environment will cause changes in the concentration of interfering gases, it is necessary to continuously ventilate for a long period of time to allow the concentration of interfering gases in the sealed test chamber to reach equilibrium. However, it is impossible to accurately determine whether the concentration in the sealed test chamber has reached equilibrium, or what the specific concentration is, which introduces a certain degree of operational error. Summary of the Invention

[0003] The purpose of this invention is to solve the problem in the prior art that changes in the concentration of interfering gases due to changes in the volume of the environment require continuous ventilation for a long period of time to bring the concentration of interfering gases in the sealed test chamber to equilibrium. However, it is impossible to accurately determine whether the concentration in the sealed test chamber has reached equilibrium and what the specific concentration is, which has a certain degree of operational error. Therefore, this invention proposes a gas interference simulation device and method for testing gas alarms.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A gas interference simulation device for testing gas alarms includes a test chamber, in which the gas alarm is placed. The test chamber has a first air inlet on its top surface and an exhaust vent and a sealing plug adapted to the exhaust vent on its side. A multi-functional gas analyzer and a flow controller are fixedly installed inside the test chamber. The device also includes an interference device, which is fixedly installed inside the test chamber and is used to detect whether the gas alarm emits an alarm sound in an interfering gas environment at various specified concentrations.

[0005] In order to extract an equal volume of gas, preferably, the interference device includes: a suction box fixedly installed inside the detection box, a first piston plate assembled inside the suction box, a cylinder fixedly installed on the detection box, the movable end of the cylinder passing through the detection box and fixedly connected to the first piston plate; a second air inlet and a first air pipe adapted to the second air inlet are opened on the bottom surface of the suction box, and an electromagnetic one-way valve is fixedly installed inside the first air pipe.

[0006] To further separate methane from the mixed gas, the system further includes: a separation unit fixedly installed at the bottom of the extraction box; a separation chamber provided within the separation unit; a second gas pipe fixedly connected between the separation chamber and the extraction box; and a gas passage extending to the bottom of the separation unit opened on the bottom surface of the separation chamber; a positioning frame elastically installed within the separation chamber; and a first separation membrane slidably installed within the positioning frame.

[0007] To further accelerate gas flow, an isolation plate is fixedly installed inside the separation chamber, an overflow pipe is fixedly installed on the isolation plate, and an overflow valve is fixedly installed inside the overflow pipe. A sliding plate is slidably installed inside the separation chamber, and the sliding plate is provided with a circular hole and a hollow rod adapted to the circular hole. A second separation membrane is fixedly installed inside the circular hole, and the hollow rod is slidably installed inside the air passage. A first sealing plate is rotatably installed at the output end of the air passage via a torsion spring.

[0008] To further ensure the unobstructed flow of the first separation membrane, a first spring is fixedly connected between the slide plate and the bottom surface of the separation chamber, first wave plates are fixedly installed on both sides of the slide plate, and a second wave plate adapted to the first wave plate is fixedly installed on the positioning frame; a guide groove is provided on the positioning frame.

[0009] To further improve detection efficiency, the system also includes: a turntable mounted on the detection box, an air storage cylinder attached to the turntable, an output port and an output pipe adapted to the output port on the side of the air storage cylinder near the detection box; a ratchet coaxially mounted on the turntable, a drive plate fixedly mounted on the movable end of the cylinder, the drive plate slidably mounted on the detection box, and a toothed groove adapted to the ratchet on the drive plate.

[0010] To create a sealed environment inside the gas storage tank and reduce the risk of gas leakage, a telescopic sleeve is slidably installed on the output pipe. One side of the telescopic sleeve is beveled, and through holes are symmetrically opened on the outer edge of the telescopic sleeve.

[0011] To further reduce the risk of gas leakage, the gas storage cylinder is further equipped with symmetrical uprights, and a connecting plate is fixedly installed between the symmetrical uprights. A sliding rod is slidably installed in the connecting plate. One end of the sliding rod passes through the gas storage cylinder and is fixedly installed with a second sealing plate. The other end of the sliding rod is fitted with a second spring, and the two ends of the second spring abut against the sliding rod and the connecting plate, respectively.

[0012] In order to determine the remaining amount of gas in the gas storage cylinder by observing the position of the second piston plate, the gas storage cylinder is further equipped with a second piston plate, and an indicator is fixedly installed on the second piston plate.

[0013] A gas interference simulation method for testing gas alarms, the operation steps are as follows: Step 1: First, prepare methane gas, interfering gas, and a mixture of gases containing methane; Step 2: Next, the performance of the gas alarm is tested using methane gas, interfering gas, and a mixture of gases containing methane. Step 3: Finally, after separating the methane gas from the mixed gas using an interference device, the gas alarm is tested again to determine whether its performance is up to standard.

[0014] Compared with the prior art, the present invention provides a gas interference simulation device and method for testing gas alarms, which has the following beneficial effects: 1. This gas interference simulation device for testing gas alarms delivers methane from the first inlet to the extraction box. A cylinder pushes the first piston plate to compress the gas into the first gas pipe and into the detection chamber. A multi-functional gas analyzer detects that the methane concentration reaches (5000±50) ppm. The device observes whether the gas alarm issues an alarm signal. Then, the methane gas is vented through the exhaust vent for two minutes to see if the alarm stops, thus determining whether the gas alarm is qualified. Alternatively, interference gas is delivered to the extraction box. A cylinder pushes the first piston plate to compress the gas into the first gas pipe and into the detection chamber. A multi-functional gas analyzer detects that the interference gas concentration reaches (2000±200) ppm. The device observes whether the gas alarm issues an alarm signal. Then, the interference gas is vented through the exhaust vent, thus determining whether the gas alarm passes the test. Furthermore, the internal volume of the extraction box is fixed, ensuring that the gas volume entering the detection chamber is the same each time, reducing detection errors. 2. The gas interference simulation device for testing this gas alarm delivers a mixed gas containing methane into the extraction box. A cylinder pushes the first piston plate to squeeze the mixed gas into the first and second gas pipes respectively. Part of the gas enters the detection chamber through the first gas pipe. A multi-functional gas analyzer detects that the concentration of the mixed gas reaches (2000±200) ppm, and observes whether the gas alarm emits an alarm signal. Part of the gas enters the separation chamber through the second gas pipe and is separated from the methane gas in the mixed gas by the first separation membrane. The separated methane gas is blown towards the second separation membrane through the overflow valve. On the one hand, the overflow valve accelerates the gas flow rate, and the second separation membrane is pushed by the force to push the slide plate. The hollow rod on the slide plate slides in the gas passage and pushes open the first sealing plate, allowing the methane gas to enter the detection chamber. Observe whether the gas alarm emits an alarm signal. Then, after venting the methane gas through the exhaust port for two minutes, observe whether the alarm stops, thus determining whether the gas alarm is qualified. On the other hand, the rotating first sealing plate is always in a state of blocking the gas passage without external interference, preventing the gas in the separation unit from interfering with the gas in the detection chamber. 3. In the gas interference simulation device for testing the gas alarm, after the gas in the separation chamber is delivered, the slide plate loses its impact force and resets under the action of the first spring. The first wave plate on the slide plate continuously pushes the second wave plate on the positioning frame, causing the first separation membrane to vibrate. As water molecules in the gas are absorbed by the first separation membrane, and as the separation time increases, the number of water molecules gradually increases to form small water droplets. Under the action of vibration, the small water droplets drip down and collect from the guide groove on the positioning frame to the isolation plate. Water-absorbing cotton cloth or sponge can be installed on the isolation plate to keep the first separation membrane unobstructed. 4. The gas interference simulation device for testing the gas alarm uses a toothed groove on the drive plate to rotate the meshing ratchet during the process of the cylinder pushing the first piston plate. This ratchet rotates and transmits the rotational force to the turntable. On the one hand, it aligns the other gas storage cylinder containing the interfering gas with the first air inlet, improving the gas delivery efficiency. On the other hand, the inclined surface on the telescopic sleeve of the original gas storage cylinder is squeezed by the edge of the first air inlet during rotation and rises again to cover the output pipe of the gas storage cylinder, creating a sealed state inside the gas storage cylinder and reducing the risk of gas leakage. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the gas interference simulation device for testing a gas alarm proposed in this invention; Figure 2 This is a schematic diagram of the extraction box structure of a gas interference simulation device for testing a gas alarm proposed in this invention; Figure 3 This is a schematic diagram of the second-view structure of the extraction box of a gas interference simulation device for testing a gas alarm proposed in this invention. Figure 4 This is a schematic diagram of the telescopic sleeve structure of a gas interference simulation device for testing a gas alarm proposed in this invention; Figure 5 This is a schematic diagram of the separation unit structure of a gas interference simulation device for testing gas alarms proposed in this invention; Figure 6 This is a schematic diagram of the positioning frame structure of a gas interference simulation device for testing gas alarms proposed in this invention. Figure 7 This is a schematic diagram of the gas storage tank structure of a gas interference simulation device for testing gas alarms proposed in this invention; Figure 8 This invention proposes a gas interference simulation device for testing gas alarms. Figure 5 A schematic diagram of the structure of part A.

[0016] In the diagram: 1. Detection box; 101. Exhaust vent; 102. Sealing plug; 103. First air inlet; 2. Multifunctional gas analyzer; 3. Separation unit; 301. Separation chamber; 302. Second air pipe; 303. Air passage; 3031. First sealing plate; 304. Positioning frame; 3041. Second corrugated plate; 3042. Guide groove; 305. First separation membrane; 306. Isolation plate; 307. Overflow pipe; 308. Slide plate; 3081. Circular hole; 3082. Second separation membrane; 3083. First corrugated plate; 309. Empty 310. Core rod; 311. First spring; 312. Connecting pin; 313. Third spring; 4. Air extraction box; 401. First piston plate; 402. First air pipe; 5. Cylinder; 501. Drive plate; 6. Air storage tank; 601. Output port; 602. Output pipe; 603. Telescopic sleeve; 6031. Through hole; 604. Connecting plate; 605. Slide rod; 606. Second sealing plate; 607. Second spring; 608. Second piston plate; 6081. Indicator; 609. Vertical rod; 7. Turntable; 701. Ratchet; 8. Flow controller. Detailed Implementation

[0017] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0018] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0019] Example 1: See Figures 1-8 A gas interference simulation device for testing gas alarms includes a transparent acrylic test box 1 for easy observation of the internal testing process. The gas alarm is placed inside the test box 1. The top surface of the test box 1 has a first air inlet 103, and the side of the test box 1 has an exhaust vent 101 and a sealing plug 102 adapted to the exhaust vent 101. A multi-functional gas analyzer 2 and a flow controller 8 are fixedly installed inside the test box 1. The device also includes an interference device, which is fixedly installed inside the test box 1. The interference device is used to detect whether the gas alarm emits an alarm sound in an interference gas environment at various specified concentrations.

[0020] It should be noted that there are two exhaust vents 101. One is located on the top of the test chamber 1 to vent the gas inside the test chamber 1, and the other is located on the side of the test chamber 1 and is equipped with a fan. The fan has an adjustable wind speed port and an anemometer to monitor the wind speed so that it can meet the test standards.

[0021] The multi-functional gas analyzer 2 is a KYS-2000 pump-suction multi-functional gas analyzer 2, used to detect and display the gas type and concentration in the detection chamber 1.

[0022] The flow controller 8 consists of a calibration flow meter and a bypass flow meter. The flow rate of the gas should be no less than 500 mL / min, and the accuracy class of the flow meter should be no less than Class 4.

[0023] See Figure 1 and Figure 2 and Figure 3 The interference device includes: an air extraction box 4 fixedly installed inside the detection box 1, a first piston plate 401 assembled inside the air extraction box 4, the first piston plate 401 sliding inside the air extraction box 4, a cylinder 5 fixedly installed on the detection box 1, the movable end of the cylinder 5 passing through the detection box 1 and fixedly connected to the first piston plate 401; a second air inlet and a first air pipe 402 adapted to the second air inlet are provided on the bottom surface of the air extraction box 4, an electromagnetic one-way valve is fixedly installed inside the first air pipe 402, and gas can only enter the detection box 1 through the first air pipe 402.

[0024] With the above structure, methane is delivered from the first inlet 103 to the extraction box 4. The cylinder 5 pushes the first piston plate 401 to squeeze the gas into the first gas pipe 402 and into the detection box 1. The multi-functional gas analyzer 2 detects that the methane concentration reaches (5000±50) ppm. It observes whether the gas alarm emits an alarm signal. Then, it checks whether the alarm stops after the methane gas is vented through the exhaust port 101 for two minutes. This determines whether the gas alarm is qualified. The interfering gas is delivered to the extraction box 4. The cylinder 5 pushes the first piston plate 401 to squeeze the gas into the first gas pipe 402 and enter the detection box 1. The multi-functional gas analyzer 2 detects that the concentration of the interfering gas reaches (2000±200) ppm. It observes whether the gas alarm emits an alarm signal. Then, the interfering gas is discharged through the exhaust port 101 to determine whether the gas alarm passes the test. On the other hand, the internal volume of the extraction box 4 is fixed, so that the volume of gas entering the detection box 1 is the same each time, reducing detection errors.

[0025] The methane gas concentration can be 10%, 40%, and 60% of the full scale, with the remainder being clean air or nitrogen.

[0026] Example 2: See Figures 1-8 The solution is basically the same as in Example 1, but the entire technical solution has been further optimized based on Example 1.

[0027] See Figure 5 and Figure 8 The implementation plan for improving the sensitivity test of gas alarms has been improved, and it also includes: a separation unit 3 fixedly installed at the bottom of the extraction box 4, a separation chamber 301 provided in the separation unit 3, a second gas pipe 302 fixedly connected between the separation chamber 301 and the extraction box 4, and a gas passage 303 extending to the bottom of the separation unit 3 through the bottom surface of the separation chamber 301; a positioning frame 304 elastically installed in the separation chamber 301, and a first separation membrane 305 slidably installed in the positioning frame 304.

[0028] An isolation plate 306 is fixedly installed inside the separation chamber 301. An overflow pipe 307 is fixedly installed on the isolation plate 306. An overflow valve is fixedly installed inside the overflow pipe 307. A sliding plate 308 is slidably installed inside the separation chamber 301. A round hole 3081 and a hollow rod 309 adapted to the round hole 3081 are provided on the sliding plate 308. A second separation membrane 3082 is fixedly installed inside the round hole 3081. The hollow rod 309 is slidably installed inside the air passage 303. A first sealing plate 3031 is rotatably installed at the output end of the air passage 303 through a torsion spring.

[0029] With the above structure, the mixed gas containing methane is delivered to the extraction box 4. The cylinder 5 pushes the first piston plate 401 to squeeze the mixed gas into the first gas pipe 402 and the second gas pipe 302 respectively. Some gas enters the detection box 1 through the first gas pipe 402. The multi-functional gas analyzer 2 detects that the concentration of the mixed gas reaches (2000±200) ppm and observes whether the gas alarm emits an alarm signal. Part of the gas enters the separation chamber 301 through the second gas pipe 302 and is separated from the methane gas in the mixture by the first separation membrane 305. The separated methane gas is blown towards the second separation membrane 3082 through the overflow valve. On the one hand, the overflow valve accelerates the gas flow rate, and the second separation membrane 3082 is pushed by the force to push the slide plate 308. The hollow rod 309 on the slide plate 308 slides in the gas passage 303 and pushes open the first sealing plate 3031. The methane gas enters the detection box 1. It is observed whether the gas alarm emits an alarm signal. Then, the methane gas is vented through the exhaust port 101. After two minutes, it is determined whether the alarm stops, thus judging whether the gas alarm is qualified. On the other hand, the rotating first sealing plate 3031 is always in the state of blocking the gas passage 303 without external interference, so as to avoid the gas in the separation unit 3 from interfering with the gas in the detection box 1.

[0030] It should be noted that an electromagnetic check valve is fixedly installed inside the second gas pipe 302. When methane gas and interfering gases are being transported, the electromagnetic check valve inside the second gas pipe 302 is in the closed state.

[0031] Example 3: See Figures 1-8 The solution is basically the same as in Example 2, but the entire technical solution has been further optimized based on Example 2.

[0032] See Figure 5 and Figure 8 The implementation plan for keeping the first separation membrane 305 unobstructed is added. A first spring 310 is fixedly connected between the slide plate 308 and the bottom surface of the separation chamber 301. A first wave plate 3083 is fixedly installed on both sides of the slide plate 308. A second wave plate 3041 adapted to the first wave plate 3083 is fixedly installed on the positioning frame 304. A guide groove 3042 is opened on the positioning frame 304.

[0033] In this embodiment, the protrusions of the first wave plates 3083 on both sides are alternately arranged.

[0034] With the above structure, after the gas in the separation chamber 301 is delivered, the slide plate 308 loses its momentum and resets under the action of the first spring 310. The first wave plate 3083 on the slide plate 308 continuously pushes the second wave plate 3041 on the positioning frame 304, causing the first separation membrane 305 to vibrate. As water molecules in the gas are absorbed by the first separation membrane 305, and as the separation time increases, the number of water molecules gradually increases to form small water droplets. Under the action of vibration, the small water droplets drip down and collect from the guide groove 3042 on the positioning frame 304 to the isolation plate 306. A water-absorbing cotton cloth or sponge can be installed on the isolation plate 306 to keep the first separation membrane 305 unobstructed.

[0035] It should be noted that a connecting pin 311 is rotatably installed on the cavity wall of the separation cavity 301, and a positioning frame 304 is slidably installed on the connecting pin 311 and fixedly connected to the connecting pin 311 by a third spring 312. Under the push of the left and right first wave plates 3083, the positioning frame 304 swings left and right in the separation cavity 301.

[0036] Example 4: See Figures 1-8 The solution is basically the same as in Example 3, but the entire technical solution has been further optimized based on Example 3.

[0037] See Figure 2 and Figure 3 and Figure 4The implementation plan for improving detection efficiency has been improved, including: a turntable 7 mounted on the detection box 1, an air storage cylinder 6 being snapped onto the turntable 7, an output port 601 and an output pipe 602 adapted to the output port 601 being provided on the side of the air storage cylinder 6 near the detection box 1; a ratchet 701 being coaxially mounted on the turntable 7, a drive plate 501 being fixedly mounted on the movable end of the cylinder 5, the drive plate 501 being slidably mounted on the detection box 1, and a toothed groove adapted to the ratchet 701 being provided on the drive plate 501.

[0038] A telescopic sleeve 603 is slidably installed on the output pipe 602. One side of the telescopic sleeve 603 is a beveled surface, and through holes 6031 are symmetrically opened on the outer edge surface of the telescopic sleeve 603.

[0039] With the above structure, when air is supplied, the telescopic sleeve 603 on the output pipe 602 of the air storage cylinder 6 slides into the first air inlet 103, so that a relatively closed space is formed between the air extraction box 4 and the air storage cylinder 6. When the cylinder 5 pulls the first piston plate 401, the negative pressure inside draws the gas in the air storage cylinder 6 into the air extraction box 4. When the cylinder 5 pushes the first piston plate 401, the gas in the air extraction box 4 is squeezed into the first air pipe 402 and discharged into the detection box 1. During the process of cylinder 5 pushing the first piston plate 401, the toothed groove on the drive plate 501 drives the meshing ratchet 701 to rotate and transmits the rotational force to the turntable 7, so that another gas storage cylinder 6 containing interfering gas is aligned with the first air inlet 103. During the rotation of the original gas storage cylinder 6, the inclined surface on the telescopic sleeve 603 is squeezed by the edge of the first air inlet 103 and rises again to cover the output pipe 602 of the gas storage cylinder 6, so that the inside of the gas storage cylinder 6 is sealed and the risk of gas leakage is reduced.

[0040] It should be noted that ratchet 701 can only rotate in one direction and cannot rotate in reverse, so it is not affected by the return stroke of cylinder 5.

[0041] Example 5: See Figures 1-8 The solution is basically the same as in Example 4, but the entire technical solution has been further optimized based on Example 4.

[0042] See Figure 7 The implementation plan for reducing detection errors has been added. symmetrical uprights 609 are installed inside the gas storage cylinder 6. A connecting plate 604 is fixedly installed between the symmetrical uprights 609. A sliding rod 605 is slidably installed inside the connecting plate 604. One end of the sliding rod 605 passes through the gas storage cylinder 6 and is fixedly installed with a second sealing plate 606. A second spring 607 is sleeved on the other end of the sliding rod 605. The two ends of the second spring 607 abut against the sliding rod 605 and the connecting plate 604, respectively.

[0043] A second piston plate 608 is installed inside the gas storage cylinder 6. The second piston plate 608 slides inside the gas storage cylinder 6, and an indicator 6081 is fixedly installed on the second piston plate 608.

[0044] With the above structure, when the cylinder 5 returns, the negative pressure in the suction box 4 pulls open the second sealing plate 606, the second spring 607 is compressed, and the gas in the storage cylinder 6 is discharged from the through hole 6031 on the telescopic sleeve 603. When the cylinder 5 pushes the first piston plate 401 to squeeze the gas, the second spring 607 drives the second sealing plate 606 to reset, so that the storage cylinder 6 becomes a sealed body again. In this way, the gas volume entering the detection box 1 is the same each time, reducing detection error. On the other hand, since the gas is colorless, in order to facilitate and intuitively see the amount of gas delivered, a second piston plate 608 is installed in the storage cylinder 6. When the gas in the storage cylinder 6 is drawn by negative pressure, the second piston plate 608 follows and falls. By observing the position of the second piston plate 608, the remaining amount of gas in the storage cylinder 6 can be determined.

[0045] Example 6: See Figures 1-8 The solution is basically the same as in Example 5, but the entire technical solution has been further optimized based on Example 5.

[0046] See Figure 1 The specific implementation plan for producing special or high-concentration interfering gases has been added. A heating wire is fixedly installed inside the gas extraction box 4, and the interfering liquid is contained in one of the gas storage cylinders 6.

[0047] With the above structure, the cylinder 5 pulls the first piston plate 401 to draw the interfering liquid into the suction box 4, where it is heated and evaporates into gas. The cylinder 5 pushes the first piston plate 401 to squeeze the mixed gas into the first gas pipe 402 and into the detection box 1. The fan accelerates the airflow to reach the test standard. The multi-functional gas analyzer 2 detects that the concentration of the mixed gas reaches (2000±200) ppm. It is observed whether the gas alarm emits an alarm signal.

[0048] A gas interference simulation method for testing gas alarms, the operation steps are as follows: Step 1: First, the telescopic sleeve 603 on the output pipe 602 of the gas storage cylinder 6 slides down into the first air inlet 103, so that the gas extraction box 4 and the gas storage cylinder 6 form a relatively closed space. When the cylinder 5 pulls the first piston plate 401, the negative pressure inside draws the methane in the gas storage cylinder 6 into the gas extraction box 4. When the cylinder 5 pushes the first piston plate 401, the methane in the gas extraction box 4 is squeezed into the first gas pipe 402 and discharged into the detection box 1. The multi-functional gas analyzer 2 detects that the methane concentration reaches (5000±50) ppm. Observe whether the gas alarm emits an alarm signal. Then, after venting the methane gas through the exhaust port 101 for two minutes, check whether the alarm stops. This determines whether the gas alarm is qualified. Step 2: Next, as the cylinder 5 pushes the first piston plate 401, the toothed groove on the drive plate 501 drives the meshing ratchet 701 to rotate and transmits the rotational force to the turntable 7, so that the other gas storage cylinder 6 containing the interfering gas is aligned with the first air inlet 103. During the rotation of the original gas storage cylinder 6, the inclined surface on the telescopic sleeve 603 is squeezed by the edge of the first air inlet 103 and rises again to cover the output pipe 602 of the gas storage cylinder 6, so that the inside of the gas storage cylinder 6 is sealed. The multi-functional gas analyzer 2 detects that the concentration of the interfering gas reaches (2000±2000) ppm, observes whether the gas alarm emits an alarm signal, and then vents the interfering gas through the exhaust port 101 to determine whether the gas alarm passes the test. Step 3: Then, the mixed gas containing methane is delivered to the extraction box 4. The cylinder 5 pushes the first piston plate 401 to squeeze the mixed gas into the first gas pipe 402 and the second gas pipe 302 respectively. Some of the gas enters the detection box 1 through the first gas pipe 402. The multi-functional gas analyzer 2 detects that the concentration of the mixed gas reaches (2000±200) ppm. Observe whether the gas alarm will issue an alarm signal. Part of the gas enters the separation chamber 301 through the second gas pipe 302 and is separated from the methane gas in the mixture by the first separation membrane 305. The separated methane gas is blown towards the second separation membrane 3082 through the overflow valve. On the one hand, the overflow valve accelerates the gas flow rate, and the second separation membrane 3082 is pushed by the force to push the slide plate 308. The hollow rod 309 on the slide plate 308 slides in the gas passage 303 and pushes open the first sealing plate 3031. The methane gas enters the detection box 1. It is observed whether the gas alarm emits an alarm signal. Then, the methane gas is vented through the exhaust port 101. After two minutes, it is determined whether the alarm stops, thus judging whether the gas alarm is qualified. On the other hand, the rotating first sealing plate 3031 is always in a state of blocking the gas passage 303 without external interference, so as to prevent the gas in the separation unit 3 from interfering with the gas in the detection box 1. Step 4: Finally, after the gas in the separation chamber 301 is completely delivered, the slide plate 308 loses its momentum and resets under the action of the first spring 310. The first wave plate 3083 on the slide plate 308 continuously pushes the second wave plate 3041 on the positioning frame 304, causing the first separation membrane 305 to vibrate. As water molecules in the gas are absorbed by the first separation membrane 305, and as the separation time increases, the number of water molecules gradually increases to form small water droplets. Under the action of vibration, the small water droplets drip down and collect from the guide groove 3042 on the positioning frame 304 to the isolation plate 306. A water-absorbing cotton cloth or sponge can be installed on the isolation plate 306 to keep the first separation membrane 305 unobstructed.

[0049] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A gas interference simulation device for testing gas alarms, comprising a test chamber (1), wherein the gas alarm is placed inside the test chamber (1), characterized in that, The top surface of the detection box (1) is provided with a first air inlet (103), the side surface of the detection box (1) is provided with an exhaust port (101) and a sealing plug (102) adapted to the exhaust port (101), the detection box (1) is fixedly installed with a multi-functional gas analyzer (2) and a flow controller (8), and also includes: Interference device, the interference device is fixedly installed in the detection box (1), the interference device is used to detect whether the gas alarm will sound an alarm in the interference gas environment at each specified concentration; The interference device includes: An air extraction box (4) is fixedly installed inside the detection box (1). A first piston plate (401) is assembled inside the air extraction box (4). A cylinder (5) is fixedly installed on the detection box (1). The movable end of the cylinder (5) passes through the detection box (1) and is fixedly connected to the first piston plate (401). The bottom surface of the air extraction box (4) is provided with a second air inlet and a first air pipe (402) adapted to the second air inlet. An electromagnetic one-way valve is fixedly installed inside the first air pipe (402). Also includes: A separation unit (3) is fixedly installed at the bottom of the air extraction box (4). A separation chamber (301) is provided inside the separation unit (3). A second air pipe (302) is fixedly connected between the interior of the separation chamber (301) and the air extraction box (4). An air passage (303) is opened on the bottom surface of the separation chamber (301) and extends to the bottom of the separation unit (3). A positioning frame (304) is elastically installed in the separation chamber (301), and a first separation membrane (305) is slidably installed in the positioning frame (304). An isolation plate (306) is fixedly installed inside the separation chamber (301), an overflow pipe (307) is fixedly installed on the isolation plate (306), and an overflow valve is fixedly installed inside the overflow pipe (307). A sliding plate (308) is slidably installed in the separation chamber (301). The sliding plate (308) is provided with a circular hole (3081) and a hollow rod (309) adapted to the circular hole (3081). A second separation membrane (3082) is fixedly installed in the circular hole (3081). The hollow rod (309) is slidably installed in the air passage (303). A first sealing plate (3031) is rotatably installed at the output end of the air passage (303) through a torsion spring.

2. The gas interference simulation device for testing a gas alarm according to claim 1, characterized in that, A first spring (310) is fixedly connected between the slide plate (308) and the bottom surface of the separation chamber (301). A first wave plate (3083) is fixedly installed on both sides of the slide plate (308). A second wave plate (3041) adapted to the first wave plate (3083) is fixedly installed on the positioning frame (304). The positioning frame (304) is provided with a flow guide groove (3042).

3. The gas interference simulation device for testing a gas alarm according to claim 2, characterized in that, Also includes: Rotate the turntable (7) installed on the test box (1). A gas storage cylinder (6) is clamped on the turntable (7). An output port (601) and an output pipe (602) adapted to the output port (601) are provided on the side of the gas storage cylinder (6) near the test box (1). A ratchet (701) is coaxially mounted on the turntable (7), and a drive plate (501) is fixedly mounted on the movable end of the cylinder (5). The drive plate (501) is slidably mounted on the detection box (1), and the drive plate (501) has a toothed groove that matches the ratchet (701).

4. A gas interference simulation device for testing a gas alarm according to claim 3, characterized in that, A telescopic sleeve (603) is slidably installed on the output tube (602). One side of the telescopic sleeve (603) is a beveled surface, and through holes (6031) are symmetrically opened on the outer edge of the telescopic sleeve (603).

5. A gas interference simulation device for testing a gas alarm according to claim 4, characterized in that, The gas storage cylinder (6) is symmetrically equipped with uprights (609), and a connecting plate (604) is fixedly installed between the symmetrical uprights (609). A sliding rod (605) is slidably installed in the connecting plate (604). One end of the sliding rod (605) passes through the gas storage cylinder (6) and is fixedly installed with a second sealing plate (606). The other end of the sliding rod (605) is fitted with a second spring (607). The two ends of the second spring (607) abut against the sliding rod (605) and the connecting plate (604) respectively.

6. A gas interference simulation device for testing a gas alarm according to claim 5, characterized in that, The gas storage cylinder (6) is equipped with a second piston plate (608), and an indicator (6081) is fixedly installed on the second piston plate (608).

7. A gas interference simulation method for testing a gas alarm, comprising a gas interference simulation device for testing a gas alarm as described in any one of claims 1-6, characterized in that, The operation steps are as follows: Step 1: First, prepare methane gas, interfering gas, and a mixture of gases containing methane; Step 2: Next, the performance of the gas alarm is tested using methane gas, interfering gas, and a mixture of gases containing methane. Step 3: Finally, after separating the methane gas from the mixed gas using an interference device, the gas alarm is tested again to determine whether its performance is up to standard.

Images