A portable on-site detection device for combustible gas detector and a gas distribution method thereof

Abstract

The present invention provides a portable on-site detection device for a combustible gas detector and a gas distribution method thereof. The gas to be distributed is stored and released through a gas storage unit, and the gas to be distributed with a pressure stabilized at a first threshold is delivered to the gas mixing unit through an electromagnetic pressure regulating valve; the gas to be distributed is diluted and mixed with air through the gas mixing unit to obtain a target gas; the target gas is received by the gas transmission unit and delivered to a position to be detected; and the gas storage unit, the gas mixing unit, and the gas transmission unit are controlled by a microprocessor unit to smoothly operate to achieve gas distribution and delivery. The present invention quantifies the volume of the gas to be distributed and the concentration of the target gas through the movement of the piston in the gas mixing unit within the cylinder, so that the gas distribution method for on-site detection is further simplified, and the gas distribution concentration can be adjusted. The overall size of the invention is small and easy to carry.

Description

Technical Field

[0001] The present invention relates to the field of gas detection, and more specifically, to a portable on-site detection device of a combustible gas detector and a gas distribution method thereof. Background Art

[0002] Combustible gas detectors can detect the concentration of combustible gas in the environment and issue an alarm in time, which is an effective measure to ensure gas safety. The core component of the detector is the gas sensor, and its service life is greatly affected by the on-site use environment. The use environment of combustible gas detectors is mostly complex environments with heavy smoke and high humidity, such as kitchens, which is very likely to cause the sensitivity of the core component gas sensor to decrease, thereby changing the performance of the detector during the life of the combustible gas detector. Due to the harsh use environment of combustible gas detectors, the detectors may not be able to provide timely and accurate alarm effects during their life, which may bring many serious consequences. Therefore, in order to grasp the actual operating status of the combustible gas detectors in use, it is necessary to conduct regular inspections.

[0003] At present, the detection of combustible gas detectors mostly relies on professional testing agencies to conduct laboratory testing or on-site testing. Laboratory testing requires the removal of combustible gas detectors, and the testing cycle is usually 7-14 days. During the inspection period, there will be a lack of on-site safety measures, which may pose potential safety risks. In contrast, on-site testing has the advantages of short testing time and flexible testing locations, and is more suitable for gas companies to carry out daily inspections. However, the current common on-site detection equipment for combustible gas detectors has problems such as blind spots in detection, large size, complex operation, and high prices. On-site detection of combustible gas detectors lacks detection tools that are both reliable and portable.

[0004] Therefore, the problems existing in the prior art need to be further improved and developed. Summary of the invention

[0005] (I) Purpose of the invention: In order to solve the problems existing in the above-mentioned prior art, the purpose of the present invention is to provide a portable on-site detection device of a combustible gas detector and a gas distribution method thereof.

[0006] (II) Technical solution: In order to solve the above technical problems, the present technical solution provides a portable on-site detection device for a combustible gas detector, comprising a gas storage unit and a gas mixing unit centrally arranged in a box, a gas transmission unit is arranged outside the box, and the gas mixing unit is connected to the gas storage unit and the gas transmission unit respectively through a gas pipeline;

[0007] The gas pipelines of the gas storage unit and the gas mixing unit are provided with electromagnetic pressure stabilizing valves;

[0008] The gas storage unit includes a gas cylinder, a pressure gauge, a gas cylinder switch and a pressure reducing valve;

[0009] The gas mixing unit comprises a cylinder, a measuring module arranged on both sides of the cylinder, a piston inside the cylinder and an air pump; the measuring module is arranged on both sides of the outer peripheral wall of the cylinder parallel to the axial direction, and comprises a slide rail fixedly connected to the outer peripheral wall of the cylinder and arranged oppositely, and a sensor arranged on the slide rail;

[0010] The gas delivery unit includes a wind shield and a telescopic rod;

[0011] It also includes a microprocessing unit, which is electrically connected to the electromagnetic pressure regulating valve, the air pump and the sensor, and is used to control the gas storage unit and the gas mixing unit to distribute gas.

[0012] A portable on-site detection device for a flammable gas detector, wherein one end of the cylinder of the gas mixing unit is closed and the other end has an opening, the closed end of the cylinder is provided with a first gas inlet, a second gas inlet and a gas outlet, the open end of the cylinder is provided with an annular baffle, a movable piston is provided inside the cylinder, and the annular baffle limits the movement of the piston; a first air pump is provided at the second gas inlet, and a second air pump is provided at the gas outlet.

[0013] A portable on-site detection device for a combustible gas detector, wherein the slide rail is provided with scale lines, comprises a first slide rail and a second slide rail, the sensor comprises a first sensor and a second sensor; the first sensor comprises a first transmitter and a first receiver, the second sensor comprises a second transmitter and a second receiver; the first transmitter and the second transmitter are arranged on the first slide rail, the first receiver and the second receiver are arranged on the second slide rail, the first transmitter is fixedly connected to the first receiver, arranged opposite to each other, and used in a pair, the second transmitter is fixedly connected to the second receiver, arranged opposite to each other, and used in a pair; a first handle is arranged at an end of the first transmitter away from the cylinder, and a second handle is arranged at an end of the second transmitter away from the cylinder.

[0014] A portable on-site detection device for a combustible gas detector, wherein one end of the wind shield is connected to the gas outlet via a gas pipeline to receive the target gas, and the other end wraps the probe of the combustible gas detector to be detected; the telescopic rod is sleeved on the outside of the gas pipeline and connected to the wind shield, and the telescopic rod is telescopic.

[0015] A portable on-site detection device for a combustible gas detector, wherein the pressure reducing valve is located on the top of the gas cylinder and installed at the outlet of the gas cylinder, the gas cylinder switch is far away from the electromagnetic pressure regulating valve, and the pressure gauge is arranged at the outlet of the gas cylinder.

[0016] A portable on-site detection device for a combustible gas detector, wherein the portable on-site detection device for a combustible gas detector further comprises a power supply unit, and the power supply unit provides electrical energy for the microprocessor unit, the electromagnetic pressure regulating valve, the air pump and the sensor.

[0017] A portable on-site detection device for a combustible gas detector, wherein the microprocessor unit comprises a microprocessor, a display module, an input module and a gas list; the microprocessor is used to calculate and control each component to distribute gas; the gas list records the types of gas to be distributed, the lower explosion limits of different types of gas to be distributed and the predefined concentration of the target gas; the types of gas to be distributed stored in the gas storage unit are displayed on the display module, and the input module is used to select the type of gas to be distributed.

[0018] The technical solution also provides a gas distribution method for a portable on-site detection device of a combustible gas detector, which has the same or corresponding technical features as the above-mentioned portable on-site detection device of a combustible gas detector, and includes the following steps:

[0019] Step 1. Adjust the length of the telescopic rod and place the windshield at the position to be tested;

[0020] Step 2: Determine the type of gas to be prepared according to the type of combustible gas detector to be detected, and the microprocessor unit calculates the volume of gas to be prepared and the volume of air to be injected into the cylinder according to the lower explosion limit in the gas list;

[0021] Step 3: The gas mixing unit determines the volume position of the gas to be mixed and the volume position of the target gas through the measuring module, and dilutes and mixes the gas to be mixed with air in the mixing chamber of the cylinder to obtain the target gas;

[0022] Step 4: Input instructions through the input module, and the microprocessor unit controls the second air pump to turn on, and delivers the target gas through the gas delivery unit directly to the inside of the windshield located at the position to be detected.

[0023] A gas distribution method for a portable on-site detection device of a combustible gas detector, wherein the step 2 is specifically:

[0024] According to the type of combustible gas detector to be detected, the type of gas to be prepared is determined, and the type of gas to be prepared is selected through the input module. After the type of gas to be prepared is selected, the microprocessor unit automatically calls the gas list stored in the microprocessor unit, and the gas list records the type of gas to be prepared, the lower explosion limits of different types of gases to be prepared, and the predefined concentration of the target gas; the concentration n of the target gas calls the predefined concentration of the target gas in the gas list and is selected through the input module, or the concentration n of the target gas is manually input through the input module; the volume V of the target gas is manually set according to the on-site detection situation, and the volume V and concentration n of the target gas are manually input through the input module, and the microprocessor unit calculates the volume v of the gas to be prepared. 1 and the volume v of the air 2 , and v 1 、v 2 and the n value is displayed on the display module;

[0025] The volume v of the gas to be prepared is required to prepare the target gas with a concentration of n 1 for:

[0026]

[0027] Required air volume v 2 for:

[0028]

[0029] Where m is the lower explosion limit of the gas to be prepared.

[0030] A gas distribution method for a portable on-site detection device of a combustible gas detector, wherein the step 3 specifically comprises:

[0031] Step 31, move the first sensor to a first designated position by a first handle, and move the second sensor to a second designated position by a second handle; the first designated position is a scale position on the cylinder corresponding to the volume of the gas to be prepared, and the second designated position is a scale position on the cylinder corresponding to the volume of the target gas;

[0032] Step 32, setting a first threshold of the gas storage unit, releasing the gas to be prepared in the gas cylinder, and the microprocessing unit controlling the electromagnetic pressure regulating valve to stabilize the gas to be prepared at the first threshold and deliver it to the gas mixing unit until the first sensor senses that the piston reaches the first designated position, and the sensor sends a signal to the microprocessing unit, and the microprocessing unit controls the electromagnetic pressure regulating valve to close;

[0033] Step 33, the microprocessor controls the first air pump to open and injects air into the cylinder until the second sensor senses that the piston reaches the second specified position. The sensor sends a signal to the microprocessor, and the microprocessor controls the first air pump to close. The gas to be prepared and the air are diluted and mixed in the mixing chamber of the cylinder to obtain the target gas.

[0034] (III) Beneficial effects: The present invention provides a portable on-site detection device for a combustible gas detector and a gas distribution method thereof. The volume of gas to be distributed and the concentration of the target gas are quantified by the movement of the piston in the cylinder of the gas mixing unit, so that the gas distribution method for on-site detection is further simplified and the gas distribution concentration can be adjusted. The overall size of the invention is small and easy to carry. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of the overall structure of a portable on-site detection device of a combustible gas detector of the present invention;

[0036] Figure 2 It is a structural schematic diagram of a gas storage unit of a portable on-site detection device of a combustible gas detector of the present invention;

[0037] Figure 3 It is a structural schematic diagram of a gas mixing unit of a portable on-site detection device of a combustible gas detector of the present invention;

[0038] Figure 4 It is a structural schematic diagram of a gas delivery unit of a portable on-site detection device of a combustible gas detector of the present invention;

[0039] Figure 5 It is a schematic diagram of the connection structure of a portable on-site detection device of a combustible gas detector of the present invention;

[0040] Figure 6 The present invention is a flow chart of a gas distribution method for a portable on-site detection device of a combustible gas detector.

[0041] Figure Number:

[0042] 1-gas storage unit, 2-gas mixing unit, 3-gas transmission unit, 4-electromagnetic pressure regulating valve;

[0043] 11-gas cylinder, 12-pressure gauge, 13-gas cylinder switch, 14-pressure reducing valve;

[0044] 30-cylinder, 31-first gas inlet, 32-second gas inlet, 33-gas outlet, 34-annular baffle, 35-piston;

[0045] 41-first slide rail, 42-second slide rail;

[0046] 51-first transmitter, 52-first receiver, 53-first handle;

[0047] 61 - second transmitter, 62 - second receiver, 63 - second handle;

[0048] 71-first air pump, 72-second air pump;

[0049] 81- wind shield, 82- telescopic rod. DETAILED DESCRIPTION

[0050] The present invention is further described in detail below in conjunction with preferred embodiments. More details are elaborated in the following description to facilitate a full understanding of the present invention. However, the present invention can obviously be implemented in a variety of other ways different from the description. Those skilled in the art can make similar generalizations and deductions based on actual application situations without violating the connotation of the present invention. Therefore, the protection scope of the present invention should not be limited by the content of this specific embodiment.

[0051] The accompanying drawings are schematic diagrams of embodiments of the present invention. It should be noted that the drawings are only examples and are not drawn to scale, and should not be used to limit the actual protection scope of the present invention.

[0052] The present invention provides a portable on-site detection device for combustible gas detectors, such as Figure 1 As shown, it includes a gas storage unit 1 and a gas mixing unit 2 which are centrally arranged in a box body, a gas transmission unit 3 is arranged outside the box body, and the gas mixing unit 2 is respectively connected to the gas storage unit 1 and the gas transmission unit 3 through a gas pipeline. The portable combustible gas detector on-site detection device of the present invention also includes a microprocessing unit, which is used to control the gas storage unit 1 and the gas mixing unit 2 to distribute gas.

[0053] Preferably, the gas pipeline connecting the gas storage unit 1 and the gas mixing unit 2 is further provided with an electromagnetic pressure regulating valve 4, which is used to stabilize the pressure of the gas to be mixed delivered from the gas storage unit 1 to the gas mixing unit 2 to a fixed threshold, i.e., a first threshold, and ensure that the pressure of the gas to be mixed outputted from the electromagnetic pressure regulating valve 4 remains unchanged during the gas delivery process. The gas to be mixed is specifically a pressurized combustible gas to be diluted. The first threshold can be manually adjusted and set.

[0054] Preferably, the gas storage unit 1 includes a gas cylinder 11, a pressure gauge 12, a gas cylinder switch 13 and a pressure reducing valve 14. Figure 2As shown. The pressure reducing valve 14 is located at the top of the gas cylinder 11 and installed at the outlet of the gas cylinder 11, and is used to reduce the pressure at the outlet of the gas cylinder 11. The gas to be prepared enters the electromagnetic pressure regulating valve 4 through the gas pipeline after being decompressed from the pressure reducing valve 14. The gas cylinder switch 13 is located on the side away from the electromagnetic pressure regulating valve 4, and is used to control the opening and closing of the outlet of the gas cylinder 11. The pressure gauge 12 is set at the outlet of the gas cylinder 11, and is used to monitor the pressure inside the gas cylinder 11.

[0055] Preferably, the gas mixing unit 2 includes a cylinder 30 and measurement modules arranged on both sides of the cylinder 30. Figure 3 shown.

[0056] One end of the cylinder 30 is closed and the other end is open. The closed end of the cylinder 30 is provided with a first gas inlet 31, a second gas inlet 32 ​​and a gas outlet 33. The first gas inlet 31 is connected to the other end of the electromagnetic pressure regulating valve 4 through a gas pipeline, and the gas to be prepared is sent into the cylinder 30. The second gas inlet 32 ​​is connected to air, and air is sent into the cylinder 30 for dilution and gas mixing. The gas outlet 33 delivers the target gas in the cylinder 30, that is, the mixed gas of the gas to be prepared and air, to the gas delivery unit 3.

[0057] Preferably, the gas mixing unit 2 further comprises an air pump, which is a micro air pump, comprising a first air pump 71 and a second air pump 72. The first air pump 71 is arranged at the second gas inlet 32 ​​to provide power for the air to enter the mixing chamber of the cylinder 30, and the second air pump 72 is arranged at the gas outlet 33 to provide power for the target gas to flow out of the mixing chamber of the cylinder 3. An annular baffle 34 is arranged at one end of the cylinder 30 with an opening, and a movable piston 35 is arranged inside the cylinder 30. The annular baffle 34 limits the movement of the piston 35, so that the piston 35 only moves in the cylinder 30, and prevents the piston 35 from falling off from the cylinder 30. The piston 35 divides the cylinder 30 into two chambers: a mixing chamber and a moving chamber, wherein the moving chamber is located at one end close to the opening and is connected to the air, and the mixing chamber is located at one end away from the opening, and the gas to be mixed enters the mixing chamber to be diluted and mixed with the air. The side of the piston 35 fits tightly against the inner wall of the cylinder 30, ensuring the airtightness of the mixing chamber. The volume of the gas to be mixed and the volume of the target gas are quantified by the moving distance of the piston 35 inside the cylinder 30, thereby controlling the amount of the gas to be mixed and the dilution concentration of the target gas.

[0058] Preferably, the measuring module is arranged on both sides of the outer peripheral wall of the cylinder 30 parallel to the axial direction, and includes slide rails fixedly connected to and arranged opposite to the outer peripheral wall of the cylinder 30 and sensors arranged on the slide rails. Preferably, the slide rails are provided with scale lines indicating the volume of the cylinder 30, and the scale values ​​gradually increase in the direction close to the opening of the cylinder 30. The slide rails include a first slide rail 41 and a second slide rail 42.

[0059] The sensor is connected to the microprocessor unit and is used to monitor the position of the piston 35. When the piston 35 reaches the position monitored by the sensor, the sensor transmits a signal to the microprocessor unit, and the microprocessor unit controls other components to accurately control the mixing ratio of the gas to be prepared and the air. The sensor can be an optical sensor or other types of sensors. The sensor includes a first sensor and a second sensor. The first sensor includes a first transmitter 51 and a first receiver 52. The second sensor includes a second transmitter 61 and a second receiver 62. The first transmitter 51 and the second transmitter 61 are arranged on the first slide rail 41, and the first receiver 52 and the second receiver 62 are arranged on the second slide rail 42. The first transmitter 51 and the first receiver 52 are fixedly connected, arranged opposite to each other, and used in pairs. The second transmitter 61 and the second receiver 62 are fixedly connected, arranged opposite to each other, and used in pairs.

[0060] Preferably, a first handle 53 is provided at one end of the first transmitter 51 away from the cylinder 30, and a second handle 63 is provided at one end of the second transmitter 61 away from the cylinder 30. The first transmitter 51 and the first receiver 52 are moved to a first designated position along the slide rail by controlling the first handle 53, and the second transmitter 61 and the second receiver 62 are moved to a second designated position along the slide rail by controlling the second handle 63. The first designated position is a scale position on the cylinder 30 corresponding to the volume of the gas to be prepared, and the second designated position is a scale position on the cylinder 30 corresponding to the volume of the target gas.

[0061] Preferably, the gas delivery unit 3 is used to deliver the target gas output by the gas mixing unit to the combustible gas detector to be detected, and includes a wind shield 81 and a telescopic rod 82. Figure 4 As shown. One end of the wind shield 81 is connected to the gas outlet 33 through a gas pipeline to receive the target gas, and the other end wraps the probe of the combustible gas detector to be detected; the telescopic rod 82 is sleeved on the outside of the gas pipeline and connected to the wind shield 81, and is retractable and can be adjusted according to different heights of on-site detection. Preferably, a gas supply button is also provided on the telescopic rod 82, and the gas supply button is used to control the opening and closing of the second air pump 72 of the gas storage unit 2.

[0062] Preferably, the microprocessor unit is electrically connected to the electromagnetic pressure regulating valve 4, the air pump and the sensor. Figure 5 shown.

[0063] More preferably, the microprocessor unit includes a microprocessor, a display module, an input module and a gas list, the microprocessor is used to calculate and control each component to distribute gas; the gas list records the type of gas to be distributed, the lower explosion limit (LEL) of different types of gas to be distributed and the predefined concentration of the target gas, the lower explosion limit refers to the lowest concentration of combustible gas that can cause an explosion; the type of gas to be distributed stored in the gas storage unit 1 is displayed on the display module, and the user can select the type of gas to be distributed through the input module; the predefined concentration of the target gas is set according to the specifications of current common combustible gas detectors, such as 20%LEL, 25%LEL, 50%LEL, 60%LEL, etc.

[0064] Preferably, the display module and the input module can be arranged on the telescopic rod 82 of the gas delivery unit 3 , or arranged outside the box body integrating the gas storage unit 1 and the gas mixing unit 2 .

[0065] Preferably, the portable on-site detection device of a combustible gas detector of the present invention further includes a power supply unit, which may be a battery pack or a DC power supply, and provides electrical energy to the microprocessor unit, the electromagnetic pressure regulating valve 4, the air pump and the sensor.

[0066] A portable on-site detection device for a combustible gas detector provided by the present invention is centrally arranged in a box, is convenient and easy to carry, has a display module and an input module, is simple and easy to use, and greatly enriches the use scenarios of the detection device.

[0067] The present invention also provides a gas distribution method applicable to the above-mentioned portable combustible gas detector on-site detection device, such as Figure 6 As shown, the specific steps include:

[0068] Step 1. Adjust the length of the telescopic rod and place the windshield at the position to be tested;

[0069] Step 2: Determine the type of gas to be prepared according to the type of combustible gas detector to be detected, and the microprocessor unit calculates the volume of gas to be prepared and the volume of air to be injected into the cylinder according to the lower explosion limit in the gas list;

[0070] Step 3: The gas mixing unit determines the volume position of the gas to be mixed and the volume position of the target gas through the measuring module, and dilutes and mixes the gas to be mixed with air in the mixing chamber of the cylinder to obtain the target gas;

[0071] Step 4: Input instructions through the input module, and the microprocessor unit controls the second air pump to turn on, and delivers the target gas through the gas delivery unit directly to the inside of the windshield located at the position to be detected.

[0072] Preferably, in the present invention, the position to be detected in step 1 is a position where the wind shield can wrap the probe of the combustible gas detector to be detected.

[0073] Preferably, the step 2 of the present invention is as follows:

[0074] According to the type of combustible gas detector that needs to be detected, the type of gas to be prepared is determined, and the type of gas to be prepared is selected through the input module. After the type of gas to be prepared is selected, the microprocessor unit automatically calls the gas list stored inside the microprocessor unit. The gas list records the type of gas to be prepared, the lower explosion limit of different types of gas to be prepared, and the predefined concentration of the target gas. The concentration n of the target gas can call the predefined concentration of the target gas in the gas list, and the user selects it through the input module; or the concentration n of the target gas can be manually input through the input module. The volume V of the target gas can be manually set according to the on-site detection situation, and the user manually inputs the volume V of the target gas through the input module. The microprocessor unit calculates the volume v of the gas to be prepared 1 and the volume v of the air 2 , and v 1 、v 2 And the n value is displayed on the display module.

[0075] Assume that the volume of the target gas is V, the lower explosion limit of the gas to be prepared contained in the gas cylinder 11 is m, and the concentration of the target gas to be prepared is n.

[0076] Then the volume of gas v required to prepare the target gas with a concentration of n is 1 for:

[0077]

[0078] Required air volume v 2 for:

[0079]

[0080] Preferably, in step 3, the gas mixing unit determines the volume position of the gas to be mixed and the volume position of the target gas through a measuring module, and dilutes and mixes the gas to be mixed with air in the mixing chamber of the cylinder to obtain the target gas. Specifically, the following steps are included:

[0081] Step 31, move the first sensor to the first designated position by the first handle, and move the second sensor to the second designated position by the second handle; the first designated position is the scale position on the cylinder 30 corresponding to the volume of the gas to be prepared, and the second designated position is the scale position on the cylinder 30 corresponding to the volume of the target gas.

[0082] Specifically, according to the volume v of the gas to be prepared 1 The first handle 53 is used to adjust the positions of the first handle 53 and the second handle 63 according to the volume V of the target gas. The first transmitter 51 and the first receiver 52 are moved along the slide rail to v 1 The second handle 63 is used to move the second transmitter 61 and the second receiver 62 along the slide rail to the V scale position, that is, the second designated position.

[0083] Step 32, set the first threshold of the gas storage unit, release the gas to be prepared in the gas cylinder, and the microprocessor unit controls the electromagnetic pressure regulating valve to stabilize the gas to be prepared at the first threshold and deliver it to the gas mixing unit until the first sensor senses that the piston has reached the first specified position. The sensor sends a signal to the microprocessor unit, and the microprocessor unit controls the electromagnetic pressure regulating valve to close.

[0084] Step 33, the microprocessor controls the first air pump to open and injects air into the cylinder until the second sensor senses that the piston reaches the second specified position. The sensor sends a signal to the microprocessor, and the microprocessor controls the first air pump to close. The gas to be prepared and the air are diluted and mixed in the mixing chamber of the cylinder to obtain the target gas.

[0085] In step 32 and step 33 of the present invention, the microprocessor unit monitors the position of the piston 35 through the sensor, controls the injection amount of the gas to be prepared and the injection amount of air in the cylinder 30, and thus achieves perfect preparation of the target gas of the specified dilution concentration.

[0086] Specifically, after the microprocessor unit calculates the volume of the gas to be prepared and the volume of air to be injected into the cylinder, it turns on the gas cylinder switch 13, and the pressurized combustible gas in the gas cylinder 1 flows through the pressure reducing valve 14 and passes through the electromagnetic regulator to form the gas to be prepared with a pressure stabilized at the first threshold. The gas to be prepared enters the mixing chamber in the cylinder 3, and the piston 35 is pushed toward the opening by the pressure of the gas to be prepared. When the piston 35 moves to the position corresponding to v 1When the position corresponding to the scale position is V, that is, the first designated position, the optical path between the first transmitter 51 and the first receiver 52 in the first sensor is blocked, and a first electrical signal is generated and sent to the microprocessor unit. The microprocessor unit receives the first electrical signal and closes the electromagnetic pressure regulating valve 4 and the gas cylinder switch 13. At the same time, the air pump at the gas inlet 31 is turned on to pump the outside air into the mixing chamber. Under the action of the total air pressure of the gas to be prepared and the air, the piston 35 continues to move toward the opening of the cylinder. When the piston 35 moves to the position corresponding to the scale position V, that is, the second designated position, the optical path between the second transmitter 61 and the second receiver 62 in the second sensor is blocked, and a second electrical signal is generated and sent to the microprocessor unit. The microprocessor unit receives the second electrical signal, closes the air pump at the gas inlet 31, and opens the air pump at the gas outlet 33 to pump out the mixed gas in the mixing chamber. The piston 35 returns to the initial position under the action of the air pressure in the moving chamber, and the perfect configuration of the target gas is achieved.

[0087] In a specific embodiment, the gas to be prepared is methane gas, the lower explosion limit of methane gas is 5%, and 500 mL of methane gas with a concentration of 20% LEL is required. Then, the input module selects the type of gas to be prepared as methane, and inputs the target gas volume V to be prepared as 500 mL and the concentration n as 0.2. The microprocessing unit calculates the required methane gas volume v1 as:

[0088]

[0089] The required air volume v2 is:

[0090]

[0091] The display module of the microprocessing unit displays v1: 5ml, v2: 495ml, n: 500ml.

[0092] The first handle 53 is used to move the first transmitter 51 and the second receiver 51 along the slide rail to the corresponding 5ml scale, and the second handle 63 is used to move the second transmitter 61 and the second receiver 62 along the slide rail to the corresponding 500ml scale.

[0093] After the microprocessor calculates the volume of the gas to be prepared and the volume of air to be injected into the cylinder, the gas cylinder switch 13 is turned on, and the pressurized methane gas passes through the pressure reducing valve 14 and the electromagnetic pressure regulating valve 4 and stabilizes in the first threshold range, and is transported to the mixing chamber through the gas pipeline. The piston 35 moves to the 5ml scale in the mixing chamber, that is, the first designated position. The first sensor monitors that the piston 35 reaches the first designated position and transmits a signal to the microprocessor. The microprocessor then closes the electromagnetic pressure regulating valve 4 and the gas cylinder switch 13, and turns on the gas. The air pump at the inlet 31 pumps outside air into the mixing chamber. Under the action of the total air pressure of methane gas and air, the piston 35 moves to the 500ml scale, i.e., the second designated position. The second sensor monitors the arrival of the piston 35 at the second designated position and transmits a signal to the microprocessor. The microprocessor turns off the air pump at the gas inlet 31 and turns on the air pump at the gas outlet 33 at the same time to pump out the target gas in the mixing chamber and transport it to the inside of the wind shield 81 through a gas pipeline to perform sensitivity detection on the methane detector probe.

[0094] The present invention provides a portable on-site detection device for a combustible gas detector and a detection method thereof. The volume of gas to be mixed and the concentration of the target gas are quantified by the movement of a piston in a gas mixing unit within a cylinder, so that the gas mixing method for on-site detection is further simplified and the gas mixing concentration can be adjusted. The overall size of the invention is small and easy to carry.

[0095] The above content is an explanation of the preferred embodiments of the present invention, which can help those skilled in the art to more fully understand the technical solution of the present invention. However, these embodiments are merely illustrative, and it cannot be determined that the specific implementation methods of the present invention are limited to the description of these embodiments. For ordinary technicians in the technical field to which the present invention belongs, without departing from the concept of the present invention, several simple deductions and transformations can be made, which should be regarded as belonging to the protection scope of the present invention.

Claims

1. A portable on-site detection device for combustible gas detectors, characterized in that: It includes a gas storage unit and a gas mixing unit which are centrally arranged in a box, a gas transmission unit is arranged outside the box, and the gas mixing unit is connected to the gas storage unit and the gas transmission unit respectively through a gas pipeline; The gas pipelines of the gas storage unit and the gas mixing unit are provided with electromagnetic pressure stabilizing valves; The gas storage unit includes a gas cylinder, a pressure gauge, a gas cylinder switch and a pressure reducing valve; The gas mixing unit includes a cylinder, measuring modules arranged on both sides of the cylinder, a piston inside the cylinder and an air pump; the cylinder of the gas mixing unit is closed at one end and has an opening at the other end, the closed end of the cylinder is provided with a first gas inlet, a second gas inlet and a gas outlet, the open end of the cylinder is provided with an annular baffle, a movable piston is provided inside the cylinder, and the annular baffle limits the movement of the piston; a first air pump is provided at the second gas inlet, and a second air pump is provided at the gas outlet; the measuring module is arranged on both sides of the outer peripheral wall of the cylinder parallel to the axial direction, including a slide rail fixedly connected to the outer peripheral wall of the cylinder and arranged oppositely, and a first sensor and a second sensor arranged on the slide rail; scale lines are provided on the slide rail , including a first slide rail and a second slide rail; the first sensor includes a first transmitter and a first receiver, and the second sensor includes a second transmitter and a second receiver; the first transmitter and the second transmitter are arranged on the first slide rail, the first receiver and the second receiver are arranged on the second slide rail, the first transmitter is fixedly connected to the first receiver, arranged oppositely, and used in pairs, and the second transmitter is fixedly connected to the second receiver, arranged oppositely, and used in pairs; a first handle is arranged at an end of the first transmitter away from the cylinder, and a second handle is arranged at an end of the second transmitter away from the cylinder; the piston moves in the cylinder, and the first sensor and the second sensor monitor the position of the piston and send signals to the microprocessor unit; The gas delivery unit includes a wind shield and a telescopic rod; It also includes a microprocessing unit, which is electrically connected to the electromagnetic pressure regulating valve, the first air pump, the second air pump, the first sensor, and the second sensor, and is used to control the gas storage unit and the gas mixing unit to distribute gas.

2. A portable on-site detection device for combustible gas detector according to claim 1, characterized in that: One end of the wind shield is connected to the gas outlet through a gas pipeline to receive the target gas, and the other end wraps the probe of the combustible gas detector to be detected; the telescopic rod is sleeved on the outside of the gas pipeline and connected to the wind shield, and the telescopic rod is telescopic.

3. A portable on-site detection device for combustible gas detector according to claim 1, characterized in that: The pressure reducing valve is located at the top of the gas cylinder and installed at the outlet of the gas cylinder. The gas cylinder switch is far away from the electromagnetic pressure regulating valve. The pressure gauge is arranged at the outlet of the gas cylinder.

4. A portable on-site detection device for combustible gas detector according to claim 1, characterized in that: The portable on-site detection device of the combustible gas detector also includes a power supply unit, which provides electrical energy to the microprocessor unit, the electromagnetic pressure regulating valve, the first air pump, the second air pump, the first sensor, and the second sensor.

5. The portable on-site detection device for combustible gas detector according to claim 1 is characterized in that: The microprocessor unit includes a microprocessor, a display module, an input module and a gas list; the microprocessor is used to calculate and control each component to distribute gas; the gas list records the types of gas to be distributed, the lower explosion limits of different types of gas to be distributed and the predefined concentration of the target gas; the types of gas to be distributed stored in the gas storage unit are displayed on the display module, and the input module is used to select the type of gas to be distributed.

6. A gas distribution method for a portable on-site detection device of a combustible gas detector, characterized in that: The device is a portable on-site detection device for a combustible gas detector as claimed in any one of claims 1 to 5, and the method comprises the following steps: Step 1. Adjust the length of the telescopic rod and place the windshield at the position to be tested; Step 2: Determine the type of gas to be prepared according to the type of combustible gas detector to be detected, and the microprocessor unit calculates the volume of gas to be prepared and the volume of air to be injected into the cylinder according to the lower explosion limit in the gas list; Step 3: The gas mixing unit determines the volume position of the gas to be mixed and the volume position of the target gas through the measuring module, the piston moves in the cylinder, the first sensor and the second sensor monitor the position of the piston and send a signal to the microprocessing unit; the microprocessing unit controls the electromagnetic pressure regulating valve and the first air pump according to the signals sent by the first sensor and the second sensor, and dilutes and mixes the gas to be mixed with the air in the mixing chamber of the cylinder to obtain the target gas; The step 3 specifically includes: Step 31, move the first sensor to a first designated position by a first handle, and move the second sensor to a second designated position by a second handle; the first designated position is a scale position on the cylinder corresponding to the volume of the gas to be prepared, and the second designated position is a scale position on the cylinder corresponding to the volume of the target gas; Step 32, setting a first threshold of the gas storage unit, releasing the gas to be prepared in the gas cylinder, and the microprocessing unit controlling the electromagnetic pressure regulating valve to stabilize the gas to be prepared at the first threshold and deliver it to the gas mixing unit until the first sensor senses that the piston reaches the first specified position, and the first sensor sends a signal to the microprocessing unit, and the microprocessing unit controls the electromagnetic pressure regulating valve to close; Step 33: The microprocessor controls the first air pump to open and inject air into the cylinder until the second sensor senses that the piston reaches the second specified position. The second sensor sends a signal to the microprocessor, and the microprocessor controls the first air pump to close. The gas to be prepared and the air are diluted and mixed in the mixing chamber of the cylinder to obtain the target gas. Step 4: Input instructions through the input module, and the microprocessor unit controls the second air pump to turn on, and delivers the target gas through the gas delivery unit directly to the inside of the windshield located at the position to be detected.

7. A gas distribution method for a portable on-site detection device of a combustible gas detector according to claim 6, characterized in that: The step 2 is specifically as follows: According to the type of combustible gas detector to be detected, the type of gas to be prepared is determined, and the type of gas to be prepared is selected through the input module. After the type of gas to be prepared is selected, the microprocessor unit automatically calls the gas list stored in the microprocessor unit, and the gas list records the type of gas to be prepared, the lower explosion limits of different types of gases to be prepared, and the predefined concentration of the target gas; the concentration n of the target gas calls the predefined concentration of the target gas in the gas list, and is selected through the input module, or the concentration n of the target gas is manually input through the input module; the volume V of the target gas is manually set according to the on-site detection situation, and the volume V of the target gas is manually input through the input module, and the microprocessor unit calculates the volume v1 of the gas to be prepared and the volume v2 of the air, and displays the values ​​of v1, v2 and n on the display module; The volume v1 of the gas to be prepared for the target gas with a concentration of n is: , The required air volume v2 is: , Where m is the lower explosion limit of the gas to be prepared.

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