A combustible gas alarm online calibration device

Abstract

The present invention discloses an online calibration device for a combustible gas alarm, which specifically relates to the field of calibration of combustible gas alarms, including a fixed plate, a sealed box is provided on one side of the fixed plate, a combustible gas alarm body is installed in the sealed box, a mixing mechanism is provided on one side of the sealed box, a pressure detector is installed on the other side of the sealed box, a vacuum pump and a gas filling unit are provided at the bottom of the sealed box, the gas filling unit includes a gas tank, a solenoid valve and an electromagnetic flowmeter, a gas injection pipe connected to the sealed box is connected to the top of the gas tank, a solenoid valve is installed on the gas injection pipe, an electromagnetic flowmeter is provided at the top of the solenoid valve, support members are provided on both sides of the front end of the sealed box, and the two support members jointly support an opening and closing mechanism connected to the fixed plate. The present invention has the ability to improve the accuracy of the calibration of the combustible gas alarm, and at the same time, it can detect whether the combustible gas alarm is damaged during the calibration process.

Description

Technical Field

[0001] The present invention relates to the technical field of combustible gas alarm calibration, and more specifically, to an on-line calibration device for a combustible gas alarm. Background Art

[0002] The flammable and toxic gas alarm is a gas leak detection alarm instrument. When flammable or toxic gas leaks in an industrial environment and the flammable and toxic gas alarm detects that the gas concentration reaches the critical point set by the explosion or poisoning alarm, the alarm will send out an alarm signal to remind workers to take safety measures and drive the exhaust, cut-off and spray systems to prevent explosions, fires and poisoning accidents, thereby ensuring safe production.

[0003] In the prior art, when a combustible gas alarm is calibrated online, the combustible gas alarm does not need to be disassembled, but a technician needs to connect a calibration gas of a determined concentration to the combustible gas alarm, thereby comparing the concentration displayed on the combustible gas alarm with the actual concentration, and adjusting the parameters of the combustible gas alarm for calibration based on the comparison result. The entire calibration process is inefficient and the calibration accuracy is not high. Therefore, an online calibration device for a combustible gas alarm is proposed. Summary of the invention

[0004] In order to overcome the above defects of the prior art, the present invention provides an online calibration device for a combustible gas alarm to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an online calibration device for a combustible gas alarm, comprising a fixed plate, the fixed plate is externally connected to a program control unit, the program control unit comprises a software control system and a hardware drive unit, the hardware drive unit is controlled to work by the software control system, a sealed box is arranged on one side of the fixed plate, a combustible gas alarm body is installed in the sealed box, a mixing mechanism is arranged on one side of the sealed box, a pressure detector is arranged on the other side of the sealed box, a vacuum pump and a gas filling unit are arranged at the bottom of the sealed box, the gas filling unit comprises a gas tank, a solenoid valve and an electromagnetic flowmeter, a gas injection pipe connected to the sealed box is connected to the top of the gas tank, a solenoid valve is installed on the gas injection pipe, and an electromagnetic flowmeter is arranged on the top of the solenoid valve;

[0006] Support members are arranged on both sides of the front end of the sealing box, and the two support members jointly support an opening and closing mechanism connected to the fixing plate;

[0007] The software control system includes a timing module, a calculation module, a comparison module, a parameter adjustment module and a communication module. The calculation module is connected to the comparison module, the comparison module is connected to the parameter adjustment module, the parameter adjustment module is connected to the communication module, the calculation module and the timing module are connected to the gas filling unit, and the comparison module and the parameter adjustment module are connected to the combustible gas alarm body.

[0008] Preferably, an air intake window is provided at the front end of the sealing box, and the air intake window is sealed and matched with the opening and closing mechanism.

[0009] Preferably, a sealing frame is provided on the inner side of the air inlet window, a sealing groove 1 is provided on the sealing frame, and a sealing groove 2 is provided on the inner wall of the sealing box on the front side of the sealing frame.

[0010] Preferably, a fixing frame is welded to one side of the top end of the fixing plate, and the fixing frame and the supporting member cooperate to support the opening and closing mechanism.

[0011] Preferably, the opening and closing mechanism includes an electric push rod, a cover plate and a sealing pressure plate, one end of the electric push rod is connected to a fixing frame, a connecting frame is welded to the top of the cover plate, the connecting frame is connected to the other end of the electric push rod, a sealing pressure plate is provided on the inner side of the cover plate, and the sealing pressure plate is plugged into the air intake window.

[0012] Preferably, a sealing ring 1 is provided at the bottom of the sealing pressure plate, a sealing ring 2 is sleeved on the outer side of the sealing pressure plate, the sealing ring 1 is connected and matched with the sealing groove 1, and the sealing ring 2 is connected and matched with the sealing groove 2.

[0013] Preferably, the mixing mechanism comprises a servo motor, a rotating rod and fan blades. The servo motor is installed outside the sealed box. The output end of the servo motor is connected to the rotating rod inserted in the sealed box. The fan blades are installed at the end of the rotating rod.

[0014] Preferably, a shaft seal is provided at the connection between the rotating rod and the sealing box.

[0015] Technical effects and advantages of the present invention:

[0016] 1. By setting the opening and closing mechanism, the sealing frame and the sealing box, the opening and closing of the sealing box can be controlled, so that when the sealing box is opened, the combustible gas alarm can perform normal leakage detection work, and when the sealing box is closed, it is convenient for high-precision online calibration work, and when the sealing box is sealed, the sealing ring 1 is pressed into the sealing groove 1, and the sealing ring 2 cooperates with the sealing groove 2, so that the sealing box can be sealed and the sealing performance of the sealing box can be improved;

[0017] 2. Through the setting of vacuum pump and air pressure detector, the air in the sealed box is extracted through the air pressure detector and the vacuum pump to present a vacuum state, so as to avoid the residual gas in the sealed box causing detection error when calibrating the combustible gas alarm body, thereby improving the accuracy of the calibration of the combustible gas alarm body;

[0018] 3. Through the setting of the gas filling unit, calculation module, comparison module, parameter adjustment module and communication module, the volume of the combustible gas filled is detected by the electromagnetic flowmeter, and the combustible gas can be quantitatively filled into the sealed box. The concentration of the quantitative volume of combustible gas filled into the sealed box is calculated by the calculation module. The gas concentration detected by the combustible gas alarm body can be compared with the combustible gas concentration calculated by the calculation module through the comparison module, so as to determine the accuracy of the combustible gas alarm body detection. After analyzing the data compared by the comparison module, the parameter adjustment module can automatically adjust the parameters of the combustible gas alarm body. Calibration, and can charge a certain amount of combustible gas for calibration and detection multiple times, thereby improving the accuracy of the calibration of the combustible gas alarm. At the same time, it can determine whether the combustible gas alarm is damaged, and the communication module can remotely transmit the calibration data of the combustible gas alarm and whether it is damaged. Information, so that online automatic calibration can be achieved without disassembling the combustible gas alarm, thereby reducing the calibration workload of the detection personnel, improving the calibration efficiency, and enabling the detection personnel to promptly understand whether the combustible gas alarm is damaged, so as to facilitate timely maintenance or replacement, thereby ensuring the safety of combustible gas leak detection;

[0019] 4. By setting the mixing mechanism, the fan blades rotate in the sealed box, so as to increase the gas flow rate in the sealed box, so as to improve the uniformity of the distribution of the combustible gas in the sealed box, thereby improving the detection accuracy of the combustible gas alarm body and reducing the detection error, so as to improve the calibration accuracy during calibration. The shaft seal is set at the connection between the rotating rod and the sealed box, which can improve the sealing of the rotating rod installation, improve the smoothness of the rotating rod rotation, reduce the friction of the rotating rod, and thus increase the service life of the rotating rod;

[0020] 5. By setting the timing module, the calibration of the combustible gas alarm body can be started at a scheduled time, so there is no need for remote manual control calibration, and automatic calibration can be achieved at a scheduled time, thereby avoiding calibration omissions caused by remote online calibration by detection personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0022] Figure 2 It is a schematic diagram of the side three-dimensional structure of the present invention.

[0023] Figure 3 It is a schematic diagram of the internal structure of the sealing box of the present invention.

[0024] Figure 4 It is a structural schematic diagram of the opening and closing mechanism of the present invention.

[0025] Figure 5 It is a schematic diagram of the cross-sectional structure of the connection between the sealing box and the sealing pressing plate of the present invention.

[0026] Figure 6 It is a structural schematic diagram of the mixing mechanism of the present invention.

[0027] Figure 7 For the present invention Figure 5 Schematic diagram of the local enlarged structure at point A in the middle.

[0028] The accompanying drawings are marked as follows: 1. fixed plate; 2. sealing box; 3. opening and closing mechanism; 301. electric push rod; 302. cover plate; 303. sealing pressure plate; 4. mixing mechanism; 401. servo motor; 402. rotating rod; 403. fan blades; 5. vacuum pump; 6. gas filling unit; 7. air pressure detector; 8. combustible gas alarm body; 9. sealing frame; 10. support. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] As attached Figure 1-7 The online calibration device of a combustible gas alarm shown in the figure comprises a fixing plate 1, the fixing plate 1 is externally connected to a program control unit, the program control unit comprises a software control system and a hardware drive unit, and the hardware drive unit is controlled to work by the software control system, a sealing box 2 is arranged on one side of the fixing plate 1, a combustible gas alarm body 8 is installed in the sealing box 2, a mixing mechanism 4 is arranged on one side of the sealing box 2, a pressure detector 7 is installed on the other side of the sealing box 2, a vacuum pump 5 and a gas filling unit 6 are arranged at the bottom end of the sealing box 2, the gas filling unit 6 comprises a gas tank, a solenoid valve and an electromagnetic flowmeter, a gas injection pipe connected to the sealing box 2 is connected to the top of the gas tank, a solenoid valve is installed on the gas injection pipe, and an electromagnetic flowmeter is arranged on the top of the solenoid valve;

[0031] Support members 10 are provided at both sides of the front end of the sealing box 2, and the two support members 10 jointly support an opening and closing mechanism 3 connected to the fixing plate 1;

[0032] The software control system includes a timing module, a calculation module, a comparison module, a parameter adjustment module and a communication module. The calculation module is connected to the comparison module, the comparison module is connected to the parameter adjustment module, the parameter adjustment module is connected to the communication module, the calculation module and the timing module are connected to the gas filling unit 6, and the comparison module and the parameter adjustment module are connected to the combustible gas alarm body 8.

[0033] An air intake window is provided at the front end of the sealing box 2 , and the air intake window is sealed with the opening and closing mechanism 3 .

[0034] A sealing frame 9 is arranged inside the air inlet window, a sealing groove 1 is opened on the sealing frame 9, and a sealing groove 2 is opened on the inner wall of the sealing box 2 at the front side of the sealing frame 9.

[0035] A fixing frame is welded on one side of the top end of the fixing plate 1 , and the fixing frame and the supporting member 10 cooperate to support the opening and closing mechanism 3 .

[0036] The opening and closing mechanism 3 includes an electric push rod 301, a cover plate 302 and a sealing pressure plate 303. One end of the electric push rod 301 is connected to a fixing frame. A connecting frame is welded to the top of the cover plate 302. The connecting frame is connected to the other end of the electric push rod 301. A sealing pressure plate 303 is arranged on the inner side of the cover plate 302. The sealing pressure plate 303 is plugged into the air intake window.

[0037] A sealing ring 1 is arranged at the bottom of the sealing pressure plate 303 , and a sealing ring 2 is sleeved on the outer side of the sealing pressure plate 303 . The sealing ring 1 is connected and matched with the sealing groove 1 , and the sealing ring 2 is connected and matched with the sealing groove 2 .

[0038] The mixing mechanism 4 includes a servo motor 401, a rotating rod 402 and a fan blade 403. The servo motor 401 is installed outside the sealed box 2. The output end of the servo motor 401 is connected to the rotating rod 402 inserted in the sealed box 2. The fan blade 403 is installed at the end of the rotating rod 402.

[0039] A shaft seal is provided at the connection between the rotating rod 402 and the sealing box 2 .

[0040] Working principle of the present invention: when the combustible gas alarm body 8 is working normally, the air inlet window of the sealed box 2 is opened through the operation of the opening and closing mechanism 3, so that the combustible gas alarm body 8 can detect combustible gas leakage; when the combustible gas alarm body 8 is calibrated, the air inlet window of the sealed box 2 is closed through the opening and closing mechanism 3, so that the sealed box 2 is in a sealed state, and then the gas in the sealed box 2 is extracted through the air pressure detector 7 in cooperation with the vacuum pump 5 to present a vacuum state, and the gas filling unit 6 then fills a quantitative volume of combustible gas into the vacuum sealed box 2, and at the same time, the mixing mechanism 4 cooperates to evenly distribute the filled combustible gas in the sealed box 2, and the combustible gas alarm body 8 detects the concentration of the combustible gas filled in a quantitative manner, and then cooperates with the software control system to process the data after the combustible gas alarm body 8 is detected, and the parameters of the combustible gas alarm body 8 are automatically adjusted, thereby realizing online calibration of the combustible gas alarm.

[0041] When the opening and closing mechanism 3 and the sealing frame 9 cooperate to work on the sealing box 2, through the extension and retraction of the electric push rod 301, under the support of the cover plate 302 by the support member 10, the top of the cover plate 302 can be pushed and pulled, so that the sealing pressure plate 303 can swing synchronously with the cover plate 302. When the sealing box 2 is opened, the electric push rod 301 contracts and pulls the connecting frame welded on the top of the cover plate 302, so that the cover plate 302 is connected to the sealing pressure plate 303 and lifted up, thereby opening the air intake window, so that the combustible gas alarm body 8 is connected to the surrounding space, so that the combustible gas alarm body 8 can work normally. When the sealing box 2 is sealed, the electric push rod 301 extends, so that the cover plate 302 is pressed down, so that the sealing pressure plate 303 is inserted into the air intake window, so that the sealing ring 1 is pressed into the sealing groove 1, and the sealing ring 2 cooperates with the sealing groove 2, so that the sealing box 2 can be sealed and the sealing performance of the sealing box 2 can be improved.

[0042] When the vacuum pump 5 and the air pressure detector 7 are working, the air in the sealed box 2 is evacuated through the air pressure detector 7 in cooperation with the vacuum pump 5 to create a vacuum state, thereby preventing the residual gas in the sealed box 2 from causing detection errors when calibrating the combustible gas alarm body 8, thereby improving the accuracy of the calibration of the combustible gas alarm body 8.

[0043] When the gas filling unit 6, the calculation module, the comparison module, the parameter adjustment module and the communication module are working, the electromagnetic valve is opened to allow the combustible gas in the gas tank to be filled into the sealed box 2 from the gas injection pipe. During the process of filling the combustible gas, the electromagnetic flowmeter detects the volume of the combustible gas filled. After the combustible gas is quantitatively filled into the sealed box 2, the combustible gas alarm body 8 detects the combustible gas concentration in the sealed box 2. The calculation module calculates the concentration of the quantitative volume of combustible gas filled into the sealed box 2, and then the comparison module compares the gas concentration detected by the combustible gas alarm body 8 with the combustible gas concentration calculated by the calculation module, so as to determine the accuracy of the detection of the combustible gas alarm body 8. After the parameter adjustment module analyzes the data compared by the comparison module, , automatically calibrate the parameters of the combustible gas alarm body 8. After the initial calibration, the above steps are repeated for multiple calibration tests to improve the accuracy of the calibration of the combustible gas alarm. At the same time, if the detection accuracy of the combustible gas alarm is still low after multiple calibrations, the damage of the combustible gas alarm can be determined, and the calibration data of the combustible gas alarm and the damage information can be remotely transmitted in conjunction with the communication module, thereby achieving online automatic calibration without the need to disassemble the combustible gas alarm, reducing the calibration workload of the detection personnel, improving the calibration efficiency, and enabling the detection personnel to promptly understand whether the combustible gas alarm is damaged, so as to facilitate timely maintenance or replacement, thereby ensuring the safety of combustible gas leak detection.

[0044] When the mixing mechanism 4 is working, the servo motor 401 is operated to rotate the rotating rod 402, thereby causing the fan blades 403 to rotate in the sealed box 2, thereby increasing the gas flow rate in the sealed box 2, so as to improve the uniformity of the distribution of the combustible gas in the sealed box 2, thereby improving the detection accuracy of the combustible gas alarm body 8 and reducing the detection error, thereby facilitating the improvement of the calibration accuracy during calibration, and a shaft seal is provided at the connection between the rotating rod 402 and the sealed box 2, thereby improving the sealing of the installation of the rotating rod 402, improving the smoothness of the rotation of the rotating rod 402, reducing the friction of the rotating rod 402, and thus increasing the service life of the rotating rod.

[0045] When the timing module is working, by timing the timing module, the calibration of the combustible gas alarm body 8 can be started on time, so there is no need for remote manual control calibration, and automatic calibration can be achieved on time, thereby avoiding calibration omissions caused by remote online calibration by detection personnel.

[0046] The method for calculating the actual concentration of the combustible gas in the sealed box 2 is as follows:

[0047] First, determine that after the opening and closing mechanism 3 closes the air intake window of the sealed box 2, the volume of the internal space of the sealed box 2 is The volume of the combustible gas initially charged into the sealed box 2 is detected by the electromagnetic flowmeter. The actual charging volume is , then the actual concentration of the combustible gas introduced into the sealed box 2 is calculated for the first time The calculation formula is:

[0048]

[0049] in, is the actual concentration of combustible gas in the gas tank;

[0050] Subsequently, the combustible gas is continuously charged for multiple times, and each time the gas is tested, the volume of the combustible gas charged each time is , , then When filling for the first time, the actual concentration of the combustible gas introduced into the sealed box 2 is The calculation formula is:

[0051]

[0052] In this way, the actual concentration of the combustible gas filled in the sealed box 2 can be accurately calculated, and the detection accuracy of the combustible gas alarm 8 can be judged by comparing the actual concentration in the sealed box 2 with the actual concentration detected by the combustible gas alarm body 8 multiple times, so that effective calibration can be carried out, and accurate data support can be provided for the parameter adjustment module, so as to facilitate accurate online automatic calibration of the combustible gas alarm.

[0053] Finally, a few points should be explained: First, in the description of the present invention, it should be noted that, unless otherwise specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, which may refer to mechanical connection or electrical connection, or internal communication between two components, or direct connection. "upper", "lower", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may change;

[0054] Secondly: In the drawings of the embodiments disclosed in the present invention, only the structures related to the embodiments disclosed in the present invention are involved, and other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present invention can be combined with each other;

[0055] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An online calibration device for a combustible gas alarm, comprising a fixing plate (1), the fixing plate (1) being externally connected to a program control unit, the program control unit comprising a software control system and a hardware drive unit, the hardware drive unit being controlled by the software control system to operate, characterized in that: A sealing box (2) is provided on one side of the fixing plate (1), a combustible gas alarm body (8) is installed in the sealing box (2), a mixing mechanism (4) is provided on one side of the sealing box (2), a pressure detector (7) is installed on the other side of the sealing box (2), a vacuum pump (5) and a gas filling unit (6) are provided at the bottom end of the sealing box (2), the gas filling unit (6) comprises a gas tank, a solenoid valve and an electromagnetic flowmeter, a gas injection pipe connected to the sealing box (2) is connected to the top end of the gas tank, a solenoid valve is installed on the gas injection pipe, and an electromagnetic flowmeter is provided at the top end of the solenoid valve; Support members (10) are provided on both sides of the front end of the sealing box (2), and the two support members (10) jointly support an opening and closing mechanism (3) connected to the fixed plate (1); The software control system comprises a timing module, a calculation module, a comparison module, a parameter adjustment module and a communication module, the calculation module is connected to the comparison module, the comparison module is connected to the parameter adjustment module, the parameter adjustment module is connected to the communication module, the calculation module and the timing module are connected to the gas filling unit (6), and the comparison module and the parameter adjustment module are connected to the combustible gas alarm body (8).

2. The on-line calibration device for a combustible gas alarm according to claim 1 is characterized in that: An air intake window is provided at the front end of the sealing box (2), and the air intake window is in sealing cooperation with the opening and closing mechanism (3).

3. The on-line calibration device for a combustible gas alarm according to claim 2 is characterized in that: A sealing frame (9) is provided on the inner side of the air intake window, a sealing groove 1 is provided on the sealing frame (9), and a sealing groove 2 is provided on the inner wall of the sealing box (2) on the front side of the sealing frame (9).

4. The on-line calibration device for a combustible gas alarm according to claim 3 is characterized in that: A fixing frame is welded to one side of the top end of the fixing plate (1), and the fixing frame and the support member (10) cooperate to support the opening and closing mechanism (3).

5. The on-line calibration device for a combustible gas alarm according to claim 4 is characterized in that: The opening and closing mechanism (3) comprises an electric push rod (301), a cover plate (302) and a sealing pressure plate (303); one end of the electric push rod (301) is connected to a fixing frame; a connecting frame is welded to the top end of the cover plate (302); the connecting frame is connected to the other end of the electric push rod (301); a sealing pressure plate (303) is provided on the inner side of the cover plate (302); and the sealing pressure plate (303) is plugged into and matched with the air intake window.

6. The on-line calibration device for a combustible gas alarm according to claim 5 is characterized in that: A sealing ring 1 is provided at the bottom of the sealing pressure plate (303), a sealing ring 2 is sleeved on the outside of the sealing pressure plate (303), the sealing ring 1 is connected and matched with the sealing groove 1, and the sealing ring 2 is connected and matched with the sealing groove 2.

7. The on-line calibration device for a combustible gas alarm according to claim 6 is characterized in that: The mixing mechanism (4) comprises a servo motor (401), a rotating rod (402) and a fan blade (403); the servo motor (401) is mounted outside the sealed box (2); the output end of the servo motor (401) is connected to the rotating rod (402) inserted into the sealed box (2); and the fan blade (403) is mounted on the end of the rotating rod (402).

8. The on-line calibration device for a combustible gas alarm according to claim 7 is characterized in that: A shaft seal is provided at the connection between the rotating rod (402) and the sealing box (2).

Images