Device for verifying and calibrating gas detection alarm instrument and setting method
By designing a small-volume gas detection alarm calibration device, the control valve core and gas collection chamber structure can achieve pressure stabilization and decompression, solving the problem of calibration of gas detection alarm in a small space, improving the speed of calibration and Accuracy reduces operational complexity and training costs.
Patent Information
- Application Number
- CN202411572196.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-06
- Publication Date
- 2025-01-10
AI Technical Summary
The calibration of existing gas detection alarms in a small space is difficult to implement and the operation is complicated, which makes it difficult to quickly calibration in emergencies.
A small-volume gas detection alarm calibration device is designed, including the main connector, the control valve core and the gas collection chamber structure. By controlling the up and down movement of the valve core in the gas collection chamber, the pressure stabilization and pressure reduction are achieved, and the pressure reduction is provided. Continuous, stable gas calibration, simplifying operational steps and reducing training costs.
In a space-constrained environment, rapid verification and calibration of the gas detection alarm is achieved, which improves the accuracy of the detection results and simplifies operation and reduces personnel training costs.
Smart Images
Figure CN119291129A_ABST
Abstract
Description
Technical Field
[0001] The invention discloses a device and a setting method for verifying and calibrating a gas detection alarm, and relates to the technical field of gas alarm detection. Background Art
[0002] Gas detection alarms are key devices to ensure safety in industrial, commercial and domestic environments. They can detect the presence of harmful gases and sound the alarm in time to avoid accidents such as poisoning or explosion. However, the accuracy of gas detection alarms is the basis of their effectiveness, and regular verification and calibration are necessary to ensure their accuracy. Traditional verification and calibration methods for gas detection alarms usually require a large operating space and professional detection equipment, which poses significant challenges when used in confined spaces. Confined spaces such as underground pipes, narrow ventilation ducts and closed storage rooms are difficult to implement with traditional verification and calibration methods due to their limited space, high risks and complex operations.
[0003] Existing gas detection alarm verification and calibration devices have significant deficiencies in applications in narrow spaces. First, existing devices are mainly composed of bottled gas standard substances, pressure reducing valves, gas flow controllers, etc., which are bulky and complex in design, making them difficult to operate in narrow environments such as pipelines, ventilation systems, and closed storage rooms. These devices usually require a larger operating space and cannot adapt to the special needs of small spaces. Secondly, the operation is relatively complex. Existing devices often require professional technicians to operate. The calibration and setting steps for the alarm are cumbersome, which increases the cost of personnel training and makes rapid verification and calibration in emergency situations difficult. Summary of the invention
[0004] The purpose of the present invention is to design a device that can quickly test and calibrate a gas detection alarm in an environment with limited space.
[0005] The present invention comprises a main body connector, wherein an air path passage with openings at both ends is arranged in the main body connector, and a first switch regulating valve is arranged in the middle of the air path passage; a guide channel is arranged at the end of the main body connector, and the end of the air path passage is arranged at the bottom of the guide channel, and the inner diameter of the guide channel is larger than the diameter of the outlet of the air path passage; an upper cover with an air collecting cavity is installed on the main body connector at one end of the outlet of the air path passage, and a control valve core is arranged in the air collecting cavity, and the outer surface of the control valve core is a different diameter structure, and the lowermost part thereof is a blocking part which is located in the guide channel and can block the outlet of the air path passage, and a gap is left between the blocking part and the inner wall of the air path passage, and a transverse airway communicating with the gap is arranged in the blocking part, A longitudinal channel communicating with the transverse airway is arranged on the control valve core above the transverse airway, and the longitudinal channel communicates with the upper end surface of the control valve core; the control valve core above the blocking portion is its guide portion, the diameter of the guide portion is adapted to the diameter of the guide channel, and a second sealing ring cooperating with the guide channel is arranged on the circumferential surface of the guide portion; above the guide portion is a compression portion of the control valve core, the diameter of the compression portion is larger than the diameter of the guide portion, and is cooperating with the inner surface of the upper cover through a third sealing ring; a compression spring is arranged between the compression portion and the main body connecting piece; the compression portion is connected with the flow meter through the second switch regulating valve; the inner cavity of the upper cover cooperating with the compression portion has a height greater than that of the compression portion, so as to form a first air storage cavity.
[0006] Furthermore, a protrusion is provided on the bottom surface of the guide channel, and the upper port of the gas path channel is located on the protrusion. The design of the protrusion can improve the sealing performance of the contact surface with the blocking part.
[0007] Furthermore, a second air storage cavity having a smaller lateral dimension than the first air storage cavity is arranged above the first air storage cavity, and the upper surface of the compression portion can block the lower port of the second air storage cavity.
[0008] The second switch regulating valve further comprises a second valve cover and a second knob, which is installed at a second switch regulating valve installation cavity provided on the upper cover above the air collecting cavity; the second switch regulating valve installation cavity is provided with a second valve cover installation cavity, a second knob active cavity and a second blocking cavity, the second valve cover is connected to the inner wall of the second valve cover installation cavity by a thread, and its inner end cooperates with the step surface between the second valve cover installation cavity and the second knob active cavity by a fourth sealing ring; the main body of the second knob is cylindrical and passes through the second valve cover and is connected to the second valve cover by a thread; the diameter of the second blocking cavity is smaller than the diameter of the second knob active cavity, the front end of the second knob is conical, and can be partially inserted into and block the second blocking cavity; the airway between the air collecting cavity and the second switch regulating valve installation cavity is connected to the second blocking cavity.
[0009] Furthermore, the air path channel in the main connecting piece is composed of a lower channel connected to the air path channel inlet and an upper channel connected to the air path channel outlet, and the upper channel and the lower channel are respectively connected to the first switch regulating valve installation cavity located in the main connecting piece; the first switch regulating valve is composed of a connecting pipe, a first valve cover and a first knob; the part of the connecting pipe located in the first switch regulating valve installation cavity is connected to the inner wall of the first switch regulating valve installation cavity through a thread, and the part of the connecting pipe located outside the first switch regulating valve installation cavity is connected to the first valve cover through its external thread; a step surface is provided in the inner hole of the connecting pipe, and a first sealing ring and an adjusting pad are installed between the first valve cover and the step surface; the first knob passes through the first valve cover, the adjusting pad and the first sealing ring and is connected to the inner wall of the connecting pipe through a thread; the inner end of the first knob is provided with a first blocking block corresponding to the position of the upper channel port.
[0010] Furthermore, the lower channel is connected to the pressure gauge installation cavity, the inner wall of the pressure gauge installation cavity is trumpet-shaped, the pressure gauge and the outer surface of the installation part are adapted to the conical surface, and are connected to the inner wall of the pressure gauge installation cavity through threads. The threaded connection design of the conical surface can ensure the sealing of the connection.
[0011] The method for setting up the gas detection alarm instrument, using the aforementioned device for verifying and calibrating the gas detection alarm instrument, comprises the following steps: S1. Prepare a gas cylinder filled with zero-point gas, N gas cylinders filled with range gases with different carbon monoxide concentrations, and N+1 devices for calibrating and testing gas detection alarms as described in claims 1 to 6, and make the first switch regulating valve and the second switch regulating valve of each device for calibrating and testing gas detection alarms in a closed state; S2, each device main body connector for calibrating the gas detection alarm is connected to an upper gas channel gas cylinder, and the first switch regulating valve of each device for calibrating the gas detection alarm is opened, thereby forming a zero calibration device J0 containing zero gas and range calibration devices J1 to JN respectively filled with different range gases; S3, connect the flow meter outlet of the zero calibration device N0 to the sensor interface of the alarm device through a pipeline, turn the second knob to expose the alarm device to the zero point gas, assign the display value of the alarm device to zero, then read the display value of the alarm device, if it is not zero, repeat step S3; S4. Select any range calibration device Jn, connect its flow meter outlet to the sensor interface of the alarm device through a pipeline, and turn its second knob to expose the alarm device to the range gas; then assign the displayed value of the alarm device to Mn; S5. With the standard value of each range gas as the horizontal coordinate and the displayed value of the alarm instrument as the vertical coordinate, a straight line is drawn between the zero point and the Mn point and its extension line to obtain a standard curve; S6. Utilize other range calibration devices to obtain the display value Mm of the alarm instrument according to the method of step S4, wherein m is not equal to n, and use the standard value of each range gas as the horizontal coordinate, and the display value of the alarm instrument as the vertical coordinate. The zero point, Mn point and each Mm point are fitted into the curve of the alarm instrument, thereby obtaining the value of each point and the deviation value after comparison with the standard curve.
[0012] Furthermore, after step S4 is completed, the following steps are performed: close the second knob, read the display value of the set alarm instrument, and if it is not zero, repeat steps S3 to S4.
[0013] Further, after step S6 is completed, the following steps are performed: S7. Connect the flow meter outlet of the zero point calibration device N0 to the sensor interface of the alarm device through a pipeline, turn its second knob to expose the alarm device to the zero point gas, read the display value of the alarm device, if it is not zero, repeat steps S4 to S6.
[0014] The present invention is provided with a main body connector, which can be connected to a small-volume gas cylinder, is easy to carry, and can be used to calibrate the gas detection alarm in a space-constrained environment. The control valve core and gas collecting cavity structure designed in the present invention can control the valve core to move up and down in the gas collecting cavity, and play a role in stabilizing and reducing the pressure of the calibration gas output by the device, providing continuous and stable gas for the gas detection alarm to be calibrated, thereby ensuring the accuracy of the alarm detection result.
[0015] In the process of setting the alarm instrument, the present invention adopts a method of measuring multiple range gases, fitting the values of each range gas in the alarm instrument to the curve of the alarm instrument, and comparing with the standard curve to obtain the deviation value; the above method has simple operating steps in the process of setting the alarm instrument, reduces the training cost of operators, and can quickly calibrate the alarm instrument during the setting process. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 A three-dimensional diagram of an embodiment of the present invention; Figure 2 for Figure 1 The main view of Figure 3 for Figure 1 A top view of Figure 4 for Figure 3 Sectional view in the AA direction; Figure 5 for Figure 3 Cross-sectional view in the BB direction; Figure 6 for Figure 4 A partial enlarged view of point C in the middle; Figure 7 for Figure 4 A partial enlarged view of point D in the middle; Figure 8 for Figure 4 A partial enlarged view of point E in the middle; Fig. 9 for Figure 5 A partial enlarged view of point F in the middle; Fig.10 for Figure 5 A partial enlarged view of the G in the middle; Fig.11 This is a state diagram of an embodiment of the present invention after the gas cylinder is installed; Fig.12 A curve diagram of the display value of the measured alarm instrument obtained after measuring gases of various ranges in the embodiment of the present invention; Among them, 1. main body connector, 2. air path channel, 3. lower channel, 4. upper channel, 5. first switch regulating valve installation cavity, 6. first switch regulating valve, 7. connecting pipe, 8. first valve cover, 9. first knob, 10. first blocking block, 11. first sealing ring, 12. adjusting pad, 13. protrusion, 14. guide channel, 15. upper cover, 16. air collecting cavity, 17. control valve core, 18. blocking part, 19. second blocking block, 20. transverse airway, 21. longitudinal channel, 22. guide part, 23. second sealing ring, 24. compression part, 25. third sealing ring, 26. compression spring, 27. first air storage cavity, 28. Second air storage chamber, 29. Second blocking chamber, 30. Second knob movable chamber, 31. Second valve cover installation chamber, 32. Second switch regulating valve, 33. Second valve cover, 34. Fourth sealing ring, 35. Second knob, 36. Flow meter housing, 37. Flow meter, 38. Rubber pad, 39. Float, 40. Quick-connect plug, 41. Leak detection hole, 42. Pressure gauge installation chamber, 43. Pressure gauge, 44. Inflating valve body, 45. Inflating valve closing thread, 46. Fifth sealing ring, 47. Inflating nozzle, 48. Inflating tube, 49. Valve stem, 50. Reset spring, 51. Gas cylinder sealing ring, 52. Gas cylinder, 53. Filter. DETAILED DESCRIPTION
[0017] by Figure 2 The up, down, left, right, front and back directions of this embodiment are defined, wherein the output end of each channel is the end.
[0018] As shown in the figure, this embodiment includes a main body connector 1, and an air path 2 is provided inside the main body connector 1. The air path 2 is provided with openings at both ends, the lower end opening is the inlet of the air path 2, and the upper end opening is the outlet of the air path 2. The air path 2 is composed of a lower channel 3 and an upper channel 4. The lower channel 3 is connected to the inlet of the air path 2, and the upper channel 4 is connected to the outlet of the air path 2. A first switch regulating valve installation cavity 5 is provided on the right side of the middle of the air path 2. Both the lower channel 3 and the upper channel 4 are connected to the first switch regulating valve installation cavity 5. A first switch regulating valve 6 is provided in the first switch regulating valve installation cavity 5. The first switch regulating valve 6 includes a connecting pipe 7, and both left and right ends of the outer surface of the connecting pipe 7 are provided with external threads; the left end of the connecting pipe 7 is installed in the first switch regulating valve installation cavity 5, and is connected to the inner wall of the first switch regulating valve installation cavity 5 by threads; the inner hole of the connecting pipe 7 is a step surface structure, and the left part thereof is provided with internal threads, and a first knob 9 is screwed on it. When in use, the first knob 9 can be turned to move left and right along the inner hole of the connecting pipe 7. A first sealing ring 11 is provided at the right part of the inner hole of the connecting pipe 7 to ensure the sealing of the inner hole of the connecting pipe 7. An adjusting pad 12 is provided on the right side of the first sealing ring 11, and the right part of the inner hole of the connecting pipe 7 is filled by the adjusting pad 12, and the first knob 9 is limited by the first sealing ring 11. A right first valve cover 8 is provided on the right side of the adjusting pad 12, and the first valve cover 8 is connected to the right end of the connecting pipe 7 by threads, which limits the first sealing ring 11 and the adjusting pad 12. A first blocking block 10 is disposed at the left end of the first knob 9. The position of the first blocking block 10 corresponds to the output port of the lower channel 3. During use, turning the first knob 9 can control the on and off of the lower channel 3. In this embodiment, the first blocking block 10 is made of rubber material, which can improve the sealing performance when blocking the lower channel 3.
[0019] A guide channel 14 is provided at the end of the main connecting member 1, and a conical protrusion 13 is provided at the bottom of the guide channel 14. The output port at the upper part of the gas path channel 2 extends to the protrusion 13 and communicates with the guide channel 14; wherein, the inner diameter of the guide channel 14 is larger than the inner diameter of the output port of the gas path channel 2. An upper cover 15 is provided above the main connecting member 1, and the upper cover 15 is fixedly connected to the main connecting member 1 by bolts, and a rubber pad is provided at the connection to ensure the tightness of the connection. An air collecting cavity 16 is provided in the upper cover 15, and a control valve core 17 is provided in the air collecting cavity 16. The outer surface of the control valve core 17 is a different diameter structure, and the lowest part is a blocking part 18. The diameter of the blocking portion 18 is smaller than the inner diameter of the guide channel 14, and there is a gap between the blocking portion 18 and the inner wall of the guide channel 14; a transverse airway 20 is provided through the upper part of the blocking portion 18, and the gap between the transverse airway 20 and the outer periphery of the blocking portion 18 is the same. When in use, the gas output from the gas path channel 2 can enter the transverse airway 20 through the gap around the blocking portion 18. A second blocking block 19 is provided at the lower end of the blocking portion 18. In this embodiment, the second blocking block 19 is made of rubber material. When the blocking portion moves downward, it cooperates with the protrusion 13 to improve the sealing of the output end of the gas path channel 2. A longitudinal channel 21 is provided at the center of the control valve core 17. The lower end of the longitudinal channel 21 is connected to the transverse airway 20, and the upper end extends to the upper end surface of the control valve core 17 for conveying gas. Above the blocking portion 18 is the guide portion 22 of the control valve core 17. The outer diameter of the guide portion 22 is adapted to the diameter of the guide channel 14. When the control valve core 17 moves up and down, the guide portion 22 cooperates with the guide channel 14 to play a guiding and limiting role. A second sealing ring 23 is provided at the lower part of the outer periphery of the guide portion 22. The second sealing ring 23 matches the inner wall of the guide channel 14, which can prevent gas leakage at the blocking portion 18. Above the guide portion 22 is the compression portion 24 of the control valve core 17. The diameter of the compression portion 24 is larger than the guide portion 22. A third sealing ring 25 is provided at the outer periphery of the guide portion. The third sealing ring 25 matches the inner wall of the gas collecting chamber 16, which can prevent gas leakage transported through the longitudinal channel 21. A compression spring 26 is provided between the lower surface of the compression portion 24 and the main connecting member 1. When the control valve core 17 moves downward under pressure, the compression spring 26 can play a resetting role. When the height of the air collecting chamber 16 in the upper part of the compression part 24 is greater than the height of the compression part 24, a first air storage chamber 27 is formed above the compression part 24. A second air storage chamber 28 is provided above the compression part 24, and the lateral dimension of the second air storage chamber 28 is smaller than that of the first air storage chamber 27. After the control valve core 17 is reset by the compression spring 26, the compression part 24 can block the lower port of the second air storage chamber 28.
[0020] A second switch regulating valve installation cavity is provided in the upper cover 15 above the gas collecting cavity 16, and the second switch regulating valve installation cavity includes a second blocking cavity 29, a second knob movable cavity 30 and a second valve cover installation cavity 31, wherein the lower end of the second blocking cavity 29 is communicated with the gas collecting cavity 16 through an air passage. A second knob movable cavity 30 is provided on the right side of the second blocking cavity 29, and its diameter is larger than the diameter of the second blocking cavity 29. A second valve cover installation cavity 31 is provided on the right side of the second knob movable cavity 30, and the diameter of the second valve cover installation cavity 31 is larger than the second knob movable cavity 30, and an internal thread structure is provided on the inner wall. A second switch regulating valve 32 is provided in the second switch regulating valve installation cavity, and the second switch regulating valve 32 includes a second valve cover 33, and the second valve cover 33 is connected to the inner wall of the second valve cover installation cavity 31 by threads. A fourth sealing ring 34 is provided at the left end of the second valve cover 33. The fourth sealing ring 34 is connected with the step surface between the second valve cover installation cavity 31 and the second knob activity cavity 30, which can prevent gas leakage in the second switch regulating valve installation cavity. A second knob 35 is provided in the second valve cover 33. The main body of the second knob 35 is cylindrical, passes through the second valve cover 33 and is connected to the inner wall of the second valve cover 33 by threading. Rotating the second knob 35 can make it move left and right along the second valve cover 33. The end of the second knob 35 close to the second blocking cavity 29 is conical. When the second knob 35 moves to the left, a section of the cone can be partially inserted into and block the second blocking cavity 29. During use, the opening size of the second blocking cavity 29 can be controlled by moving the second knob 35.
[0021] The upper end of the upper cover 15 is provided with a right flow meter housing 36, and the lower end of the flow meter housing 36 is installed on the upper cover 15 by threads. A sealing gasket structure is provided at the connection between the flow meter housing 36 and the upper cover 15 to prevent gas leakage in the installation cavity of the second switch regulating valve. A flow meter 37 is provided in the flow meter housing 36, and a float 39 is provided in the flow meter 37. During use, the flow rate of gas passing through the flow meter can be judged by the position of the float. Rubber pads 38 are provided at the upper and lower ends of the flow meter 37 to provide vibration reduction protection for the flow meter 37. A quick-connect plug 40 is provided at the upper end of the flow meter housing 36 to facilitate the connection of the pipeline to the device.
[0022] In this embodiment, the quick-connect plug 40 adopts PC4-1 / 8NPT type with a diameter of 4mm. This structure is a prior art and will not be described in detail here. The second switch regulating valve 32 can adjust the output flow at the quick-connect plug 40 and can adjust the output flow within the range of 0-800mL / min. The first switch regulating valve 6 can adjust the pressure of the output gas within the range of 0-0.3MPa.
[0023] In this embodiment, a leak detection hole 41 is opened at the rear end of the upper cover 15, and the leak detection hole 41 is located at the lower end of the compression part 24. During use, when the control valve core 17 is in a stable and motionless state, soapy water is applied to the outside of the leak detection hole 41 to observe whether bubbles are generated, thereby judging whether there is a leakage problem between the second sealing ring 23 and the third sealing ring 25.
[0024] A pressure gauge installation cavity 42 is provided at the front of the main connecting member 1. The inner wall of the pressure gauge installation cavity 42 is horn-shaped, and the rear end is connected to the lower channel 3. A pressure gauge 43 is provided in the pressure gauge installation cavity 42. The rear end connection surface of the pressure gauge 43 is a conical surface, which matches the inner wall of the pressure gauge installation cavity 42 and is connected to the inner wall of the pressure gauge installation cavity 42 through a thread. In this embodiment, the conical thread design of the connection surface between the pressure gauge installation cavity 42 and the pressure gauge 43 ensures the sealing of the connection. In this embodiment, the reading range of the pressure gauge 43 is 0-25MPa.
[0025] The lower end of the main connecting member 1 is provided with an external thread for connecting the gas cylinder 52, and a gas cylinder sealing ring 51 is provided above the external thread to prevent gas leakage after the gas cylinder is connected. A filter is provided in the inner cavity at the lower end of the main connecting member to filter the gas in the gas cylinder 52 to ensure the purity of the output gas. In this embodiment, the gas cylinder 52 is made of aluminum alloy, and the filling volume is 0.5L under the condition of a filling pressure of 10MPa to ensure that the device is easy to carry after the gas cylinder is installed.
[0026] An air-filling valve body 44 is arranged at the rear of the main connecting member 1. The air-filling valve body 44 is connected to the main connecting member 1 by threads. The connection surface between the air-filling valve body 44 and the main connecting member 1 is a conical surface. The design of the conical thread ensures the sealing of the connection. The internal hole of the air-filling valve body 44 is a step-shaped structure, and the step hole is connected to the lower channel 3. A reset spring 50 is arranged in the step hole, and a valve stem 49 is arranged on the left side of the reset spring 50. The valve stem 49 is arrow-shaped, and the left end extends into the reset spring 50. There is a gap between the middle part and the step hole of the air-filling valve body 44, and the right end is a cylindrical structure. An air-filling valve closing thread 45 is arranged on the right side of the valve stem 49. A through hole is opened in the air-filling valve closing thread 45, and the size of the through hole matches the size of the cylindrical structure at the right end of the valve stem 49. An air-filling pipe 48 is arranged on the right side of the air-filling valve body 44, and the air-filling pipe 48 is connected to the air-filling valve body 44 by threads. An inflatable nozzle 47 is provided inside the inflatable tube 48, and a through hole is provided inside the inflatable nozzle 47, and the size of the left end of the through hole matches the size of the cylindrical structure at the right end of the valve stem. A fifth sealing ring 46 is provided between the closing thread 45 of the inflatable valve and the inflatable nozzle 47, which can prevent the gas leakage in the inflatable valve body 44 and the inflatable tube 48. When the gas cylinder 52 is inflated through the inflatable tube 48, the first switch regulating valve needs to be closed to block the lower channel 3. Then the right end of the inflatable tube 48 is connected to the inflatable device, and the gas enters the inflatable nozzle 47 through the inflatable tube 48. The gas will squeeze the valve stem 49 to move to the left, and then enter the lower channel 3 through the gap around the valve stem 49, and the gas enters the gas cylinder 52 from the lower end of the lower channel 3. After the inflation is completed, the inflatable tube 48 is removed, and the reset spring 50 pushes the valve stem 49 to the right to reset, so as to prevent the gas leakage in the gas cylinder 52.
[0027] When the present embodiment is in use, the first switch regulating valve 6 and the second switch regulating valve 32 are both in a closed state. First, the gas cylinder 52 is installed to the lower end of the main connecting member 1, and the first switch regulating valve 6 is opened to make the air pressure in the gas path channel 2 reach 0.3MPa, and the gas in the gas cylinder 52 enters the second gas storage chamber 28 through the gas path channel 2. Then the quick-connect plug 40 is connected to the device under test through a pipeline, and a hose connection can be used, which has high flexibility after connection. After the connection is completed, the second switch regulating valve 32 is gradually opened, and the gas enters the pipeline through the flow meter 37. At this time, the flow meter 37 needs to be observed. When the flow reaches the predetermined value of 800mL / min, the adjustment of the second switch regulating valve 32 is stopped. In the present embodiment, the output flow can be adjusted in real time through the second switch regulating valve 32 according to the needs of the device under test, so as to provide controllable gas to the device under test. When the output flow is 800mL / min, the output flow is equal to the input flow. At this time, the upper surface of the compression part 24 blocks the lower port of the second gas storage chamber 28, and the gas is output through the second switch regulating valve 32 through the second gas storage chamber 28. When the output flow rate needs to be adjusted to 400mL / min, the output flow rate is less than the input flow rate, and the gas is stored in the second gas storage chamber 28. As the gas is stored, the compression part 24 is pressurized, and the control valve core 17 moves downward; at this time, the height of the upper part of the compression part 24 and the gas collecting chamber 16 that cooperates with it is greater than the height of the compression part 24, and a first gas storage chamber 27 is formed above the compression part 24. As the gas in the two gas storage chambers continues to increase, the control valve core 17 gradually moves downward until the blocking part 18 blocks the upper channel 3 and stops inputting gas into the gas storage chamber. At this time, the compression spring 26 pushes the control valve core 17 upward by its own elastic force to ensure that the gas in the gas storage chamber can be continuously and stably output. The design of the control valve core 17 can ensure the stable output of the gas, and at the same time, by intermittently consuming the stored gas, it can avoid the long-term accumulation of gas in one structure, which has the effect of reducing the pressure on the inner cavity of the main connecting part 1 and the upper cover 15. After use, the first switch regulating valve 6 is closed first, and the gas in the gas storage chamber is discharged through the compression spring 26 to reset the control valve core 17, and then the second switch regulating valve 32 is closed.
[0028] The method for setting up the gas detection alarm instrument, using the aforementioned device for verifying and calibrating the gas detection alarm instrument, comprises the following steps: S1, prepare a gas cylinder filled with zero gas and 4 gas cylinders filled with range gases with different carbon monoxide concentrations and 5 devices for verifying and calibrating gas detection alarms, and make the first switch regulating valve 6 and the second switch regulating valve 32 of each device for verifying and calibrating gas detection alarms in a closed state; S2, each device main body connector 1 for verifying and calibrating the gas detection alarm is connected to a gas cylinder, and the first switch regulating valve 6 of each device for verifying and calibrating the gas detection alarm is opened, thereby forming a zero point calibration device J0 containing zero point gas and range calibration devices J1 to J4 respectively filled with different range gases; S3, connect the outlet of the flow meter 37 of the zero point calibration device N0 to the sensor interface of the alarm device through a pipeline, turn the second knob 35 to expose the alarm device to the zero point gas, and then set the display value of the alarm device to zero; S4, select the range calibration device J4, connect the outlet of its flow meter 37 to the sensor interface of the alarm device through a pipeline, turn its second knob 35 to expose the alarm device to the range gas; then assign the display value of the alarm device to Mn. In this embodiment, Mn is 80.5 μmol / mol; The second knob 35 is turned off, and the display value of the set alarm instrument is read. If it is not zero, steps S3 to S4 are repeated.
[0029] S5. Take the standard value of each range gas as the horizontal coordinate and the display value of the alarm device as the vertical coordinate, draw a straight line between the zero point Mn point and its extension line to obtain the standard curve; S6. Utilize other range calibration devices to obtain the display value Mm of the alarm instrument according to the method of step S4, wherein m is not equal to n, and use the standard value of each range gas as the horizontal coordinate, and the display value of the alarm instrument as the vertical coordinate. The zero point, Mn point and each Mm point are fitted into the curve of the alarm instrument, thereby obtaining the value of each point and the deviation value after comparison with the standard curve.
[0030] S7. Connect the outlet of the flow meter 37 of the zero point calibration device N0 to the sensor interface of the alarm device through a pipeline, turn its second knob 35 to expose the alarm device to the zero point gas, read the display value of the alarm device, if it is not zero, repeat steps S4 to S6.
[0031] In this embodiment, the alarm device is GT-DR600, the zero gas is a gas without carbon monoxide, and the range gas is a gas with a carbon monoxide concentration within the detection range of the alarm device. The range gas of the gas cylinder in J1 uses a carbon monoxide concentration of 20.3 μmol / mol, the range gas of the gas cylinder in J2 uses a carbon monoxide concentration of 41.0 μmol / mol, the range gas of the gas cylinder in J3 uses a carbon monoxide concentration of 59.7 μmol / mol, and the range gas of the gas cylinder in J4 uses a carbon monoxide concentration of 80.5 μmol / mol.
Claims
1. A device for testing and calibrating a gas detection alarm, comprising a main connecting piece, characterized in that: An air passage with openings at both ends is arranged in the main connecting piece, and a first switch regulating valve is arranged in the middle of the air passage; a guide passage is arranged at the end of the main connecting piece, and the end of the air passage is arranged at the bottom of the guide passage, and the inner diameter of the guide passage is larger than the diameter of the air passage outlet; an upper cover with an air collecting cavity is installed on the main connecting piece at one end of the air passage outlet, and a control valve core is arranged in the air collecting cavity, and the outer surface of the control valve core is a different diameter structure, and the lowermost part thereof is a blocking part which is located in the guide passage and can block the air passage outlet, and a gap is left between the blocking part and the inner wall of the guide passage, and a transverse air passage communicating with the gap is arranged in the blocking part, and a The control valve core is provided with a longitudinal channel communicating with the transverse airway, and the longitudinal channel is connected to the upper end surface of the control valve core; the control valve core above the blocking part is its guide part, the diameter of the guide part is adapted to the diameter of the guide channel, and a second sealing ring matching with the guide channel is arranged on the circumferential surface of the guide part; the compression part of the control valve core is above the guide part, the diameter of the compression part is larger than the diameter of the guide part, and is matched with the inner surface of the upper cover through the third sealing ring; a compression spring is arranged between the compression part and the main body connecting piece; the compression part is connected with the flow meter through the second switch regulating valve; the inner cavity of the upper cover matching with the compression part has a height greater than that of the compression part, so as to form a first air storage cavity.
2. The device for testing and calibrating a gas detection alarm according to claim 1, characterized in that: The bottom surface of the guide channel is provided with a protrusion, and the upper port of the gas path channel is located on the protrusion.
3. The device for testing and calibrating a gas detection alarm according to claim 1 or 2, characterized in that: A second air storage cavity having a smaller transverse dimension than the first air storage cavity is arranged above the first air storage cavity, and the upper surface of the compression portion can block the lower port of the second air storage cavity.
4. The device for testing and calibrating a gas detection alarm according to claim 1, 2 or 3, characterized in that: The second switch regulating valve is composed of a second valve cover and a second knob, which is installed at the second switch regulating valve installation cavity arranged on the upper cover above the air collecting cavity; the second switch regulating valve installation cavity is provided with a second valve cover installation cavity, a second knob active cavity and a second blocking cavity, the second valve cover is connected to the inner wall of the second valve cover installation cavity by a thread, and its inner end is matched with the step surface between the second valve cover installation cavity and the second knob active cavity by a fourth sealing ring; the main body of the second knob is cylindrical and passes through the second valve cover and is connected to the second valve cover by a thread; the diameter of the second blocking cavity is smaller than the diameter of the second knob active cavity, the front end of the second knob is conical, and can be partially inserted into and block the second blocking cavity; the airway between the air collecting cavity and the second switch regulating valve installation cavity is connected to the second blocking cavity.
5. The device for testing and calibrating a gas detection alarm according to claim 1 or 2, characterized in that: The air path channel in the main connecting piece is composed of a lower channel connected to the air path channel inlet and an upper channel connected to the air path channel outlet, and the upper channel and the lower channel are respectively connected to the first switch regulating valve installation cavity located in the main connecting piece; the first switch regulating valve is composed of a connecting pipe, a first valve cover and a first knob; the part of the connecting pipe located in the first switch regulating valve installation cavity is connected to the inner wall of the first switch regulating valve installation cavity through a thread, and the part of the connecting pipe located outside the first switch regulating valve installation cavity is connected to the first valve cover through its external thread; a step surface is provided in the inner hole of the connecting pipe, and a first sealing ring and an adjusting pad are installed between the first valve cover and the step surface; the first knob passes through the first valve cover, the adjusting pad and the first sealing ring and is connected to the inner wall of the connecting pipe through a thread; the inner end of the first knob is provided with a first blocking block corresponding to the position of the lower channel port.
6. The device for testing and calibrating a gas detection alarm according to claim 5, characterized in that: The lower channel is communicated with the pressure gauge installation cavity, the inner wall of the pressure gauge installation cavity is trumpet-shaped, the pressure gauge and the outer surface of the installation part are adapted to the conical surface, and are connected with the inner wall of the pressure gauge installation cavity through threads.
7. A method for setting a gas detection alarm, characterized in that: It includes the following steps: S1. Prepare a gas cylinder filled with zero-point gas, N gas cylinders filled with range gases with different carbon monoxide concentrations, and N+1 devices for calibrating and testing gas detection alarms as described in claims 1 to 6, and make the first switch regulating valve and the second switch regulating valve of each device for calibrating and testing gas detection alarms in a closed state; S2, each device main body connector for calibrating the gas detection alarm is connected to an upper gas channel gas cylinder, and the first switch regulating valve of each device for calibrating the gas detection alarm is opened, thereby forming a zero calibration device J0 containing zero gas and range calibration devices J1 to JN respectively filled with different range gases; S3, connect the flow meter outlet of the zero calibration device N0 to the sensor interface of the alarm device through a pipeline, turn the second knob to expose the alarm device to the zero point gas, assign the display value of the alarm device to zero, then read the display value of the alarm device, if it is not zero, repeat step S3; S4. Select any range calibration device Jn, connect its flow meter outlet to the sensor interface of the alarm device through a pipeline, and turn its second knob to expose the alarm device to the range gas; then assign the displayed value of the alarm device to Mn; S5. With the standard value of each range gas as the horizontal coordinate and the displayed value of the alarm instrument as the vertical coordinate, a straight line is drawn between the zero point and the Mn point and its extension line to obtain a standard curve; S6. Utilize other range calibration devices to obtain the display value Mm of the alarm instrument according to the method of step S4, wherein m is not equal to n, and use the standard value of each range gas as the horizontal coordinate, and the display value of the alarm instrument as the vertical coordinate. The zero point, Mn point and each Mm point are fitted into the curve of the alarm instrument, thereby obtaining the value of each point and the deviation value after comparison with the standard curve.
8. The method for setting up a gas detection alarm according to claim 7, characterized in that: After step S4 is completed, the following steps are performed: Close the second knob and read the display value of the alarm device. If it is not zero, repeat steps S3 to S4.
9. The method for setting up a gas detection alarm according to claim 7, characterized in that: After step S6 is completed, the following steps are performed: S7. Connect the flow meter outlet of the zero point calibration device N0 to the sensor interface of the alarm device through a pipeline, turn its second knob to expose the alarm device to the zero point gas, read the display value of the alarm device, if it is not zero, repeat steps S4 to S6.