A calibration device for a combustible gas detector installed in a pipeline

Abstract

This utility model relates to the field of safety equipment, and in particular to a calibration device for a combustible gas detector installed in a pipeline. The device includes a calibration block with a gas chamber inside, the gas chamber having an inlet and an outlet connecting to the outside, and viewing windows A and B arranged axially on two opposite sides of the gas chamber; and a clamping part disposed on the calibration block for adjusting the position of the calibration block fixed to the gas detector. This utility model provides a calibration device that can calibrate a detector already installed in a pipeline without disassembling the entire detector, thus avoiding the need for repeated disassembly and calibration of the detector.

Description

Technical Field

[0001] This utility model relates to the field of safety equipment, and in particular to a calibration device for a combustible gas detector installed in a pipeline. Background Technology

[0002] The PrimaX IR Pro infrared gas detector employs dual-wavelength infrared detection technology. It detects gas concentration by measuring the absorption characteristics of gas molecules at specific infrared wavelengths. Through a linear relationship established by dual channels (reference wave and analysis wave), it accurately measures gas concentration. It detects different gases by utilizing the different vibrational and rotational frequencies of molecules. Based on the Lambert-Beer law, it detects different gases by measuring the relationship between gas concentration and absorption intensity.

[0003] Currently, this type of detector is widely used in industrial production fields such as steel smelting and petrochemicals. When in use, the detector is usually installed on a flange, and then the flange is installed on the outer wall of the pipeline, so that the detection part of the detector is installed inside the pipeline. It is used to detect whether there is a gas leak in the pipeline and is currently the main safety protection measure adopted.

[0004] Because the detector's detection part is installed inside the pipeline, maintenance personnel need to remove the detector along with its mounting flange from the pipeline when performing regular inspections and calibrations. This greatly increases the workload of maintenance personnel. This problem has plagued on-site users for many years and has become a real pain point in their work. Utility Model Content

[0005] The main purpose of this utility model is to provide a calibration device for combustible gas detectors installed in pipelines, which can calibrate detectors already installed in pipelines without disassembling the entire detector, thereby avoiding the need to repeatedly disassemble the detectors for calibration.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A calibration device for a combustible gas detector installed in a pipeline, comprising: The calibration block has an air chamber inside, which is provided with an air inlet and an air outlet that connect to the outside. The two opposite sides of the air chamber are provided with a viewing window A and a viewing window B along the axial direction. A clamping part is provided on the calibration block for adjusting the position of the calibration block fixed to the gas detector.

[0007] Furthermore, it also includes a mounting flange, which is provided with mounting holes for the gas detector probe to pass through and be fixed, an inlet for connecting the gas inlet through a gas pipe, and an outlet for connecting the gas outlet through a gas pipe.

[0008] Furthermore, transparent lenses of the same thickness are respectively sealed and fixedly installed on the viewing window A and the viewing window B.

[0009] Furthermore, the viewing window A and viewing window B include mounting grooves with the same structure. The transparent lens is installed in the mounting groove, and an end cap is provided outside the transparent lens. The end cap is fixedly provided outside the mounting groove for pressing the transparent lens. The end cap is provided with a through hole, and the through hole is located on the same axis as the transparent lens.

[0010] Furthermore, sealing rings are respectively provided on both sides of the transparent lens.

[0011] Furthermore, the clamping part includes a clip A, and the calibration block is provided with a clip B that matches the clip A. The clip A and the clip B are fixedly connected by fasteners.

[0012] Furthermore, a clamping groove matching the support rod on the gas detector is provided between the clip A and the clip B.

[0013] Furthermore, the calibration block is provided with a protrusion, and the clip A has a through hole B that matches the protrusion. When the clip A and the clip B are clamped and fixed together, the protrusion passes through the through hole B.

[0014] Compared with the prior art, the present invention has the following beneficial effects: After using the calibration device of this patent, there is no need to disassemble it for testing. It is only necessary to fill the gas chamber with calibration gas and then calculate the total wavelength length of the detector based on the principle that the total wavelength length is equal to the wavelength length inside the gas chamber plus the wavelength length outside the gas chamber plus the thickness of the transparent lens (the transparent lens is made of quartz glass). The calibration concentration of the calibration gas in the gas chamber can be obtained by setting the calibration value in the detector. This is convenient and quick. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model.

[0016] Figure 2 This is a schematic diagram of the exploded structure of the calibration device.

[0017] Figure 3 This is a schematic diagram of the exploded structure of the calibration block and clip A.

[0018] Figure 4 This is a schematic diagram of the structure on one side of the calibration block.

[0019] Figure 5 This is a schematic diagram of the structure on the other side of the calibration block.

[0020] Figure 6 This is a schematic diagram of the structure when the calibration device is installed and in use.

[0021] Figure 7 This is a schematic diagram of the wavelength calibration principle. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present utility model, and not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0024] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0025] This utility model proposes a calibration device for a combustible gas detector installed inside a pipeline, comprising: The calibration block 10 has an air chamber 101 inside. The air chamber 101 has an air inlet 1011 and an air outlet 1012 that connect to the outside. The two opposite sides of the air chamber 101 are provided with a viewing window A1013 and a viewing window B1014 along the axial direction. The clamping part 20 is disposed on the calibration block 10 for adjusting the position of the calibration block 10 fixed to the gas detector. It also includes a mounting flange 30, which is provided with a mounting hole 301 for the gas detector probe to pass through and be fixed, an inlet 302 for connecting to the air inlet 1011 through an air pipe, and an outlet 303 for connecting to the air outlet 1012 through an air pipe.

[0026] Reference Figures 1-2 After the gas detector is installed and fixed on the mounting flange 30, the mounting flange 30 needs to be fixed to the pipe wall. The use of the clamping part 20 allows the entire calibration device to be installed and fixed on the support rod connection of the gas detector. The position can be adjusted as needed to ensure that the viewing window A1013 and viewing window B1014 are located on the detection path of the gas detector, so that light can pass through the viewing window A1013 and viewing window B1014 and then through the gas chamber 101. When calibration is required, a calibration gas of a specific concentration is introduced into the gas chamber 101 through the conduit from the inlet 302 located outside the mounting flange 30 for calibration. After calibration, air is introduced to replace the calibration gas in the gas chamber 101. In this way, calibration can be completed without disassembling the gas detector.

[0027] Further, refer to Figure 3 The transparent lenses 40 of the same thickness are respectively sealed and fixed on the viewing window A1013 and the viewing window B1014. The transparent lenses 40 of the same thickness can be conveniently prepared for production, thereby improving the overall production cost.

[0028] Furthermore, to facilitate the installation of the transparent lens 40, the viewing window A1013 and the viewing window B1014 include a mounting groove 50 with the same structure. The transparent lens 40 is installed in the mounting groove 50, and an end cap 60 is provided on the outside of the transparent lens. The end cap 60 is fixedly provided on the outside of the mounting groove 50 to press the transparent lens 40. The end cap 60 is provided with a through hole 601, which is located on the same axis as the transparent lens 40. Specifically, the mounting groove 50 can be set as circular or non-circular, preferably circular, which facilitates processing. After the transparent lens 40 is installed in the mounting groove 50, it is sealed and fixed. Then, the end cap 60 is used to lock and fix it to the calibration block with bolts, pressing and fixing the transparent lens 40 in the mounting groove 50.

[0029] Further, refer to Figure 3To ensure the sealing effect of the air chamber, sealing rings 401 are respectively provided on both sides of the transparent lens 40. In this way, the end cap 60 can press the transparent lens 40 tightly and seal it through the sealing rings 401, while avoiding the end cap 60 from damaging the glass lens 40. The sealing ring 401 near the calibration block can be an O-ring, and an O-ring mounting groove is provided in the mounting groove 50.

[0030] Further, refer to Figure 2 Therefore, it can be seen that the clamping part 20 includes a clamp A201, and the calibration block 10 is provided with a clamp B102 that matches the clamp A201. The clamp A201 and the clamp B102 are fixedly connected by fasteners, such as bolts.

[0031] Further, refer to Figure 6 To ensure that the calibration device can be connected to the gas detector, a clamping groove matching the support rod on the gas detector is provided between the clamp A201 and the clamp B102. The clamping groove can be set according to the actual shape of the support rod, such as a cylinder or other shapes.

[0032] Further, refer to Figure 3 , 4 5. To ensure effective fixation of the clip A201 to the calibration block, the calibration block 10 is provided with a protrusion 103, which can be cylindrical or rectangular. The clip A201 has a through hole B2011 that matches the protrusion 103. When the clip A201 and the clip B102 are clamped together, the protrusion 103 passes through the through hole B2011. This arrangement allows the protrusion 103 to be inserted into the through hole B2011 when the clip A201 is engaged with the calibration block 10, thereby positioning the clip A201 and the calibration block 10 and making the clamping position more accurate.

[0033] As attached Figure 7 Taking the calibration of the optical path length of the PrimaX IR Pro infrared gas detector as an example, the gas calibration process is as follows after the calibration device is installed in place; The first step was that the detector was installed on-site and powered on normally.

[0034] The second step is to connect the calibration gas to the inlet end of the mounting flange.

[0035] The third step is to put the detector into calibration mode, open the gas cylinder and introduce calibration gas into the gas chamber 10 to complete the detector calibration.

[0036] Fourth, after calibration, air is introduced into the gas chamber 10 to replace the remaining calibration gas inside the gas chamber 10, so as to avoid affecting the normal detection of the detector.

[0037] The specific calibration principle is as follows. Based on the working principle of infrared detectors, when a certain concentration of calibration gas is introduced to calibrate the detector, the reading value of the detector has a linear relationship with the length of the absorbed infrared wavelength.

[0038] The infrared wavelength absorbed by the calibration gas is only the wavelength length inside the gas chamber. The total wavelength of the detector = the wavelength length inside the gas chamber + the wavelength length outside the gas chamber + the thickness of the transparent lens, wherein the transparent lens is made of quartz glass.

[0039] As shown in Table 1 and Figure 4, the wavelength length inside gas chamber 10 is 20mm, accounting for one-quarter of the total wavelength length of 80mm. The detector reading is one-quarter of the calibrated gas concentration value, which is the accurate value. After correcting the reading value through the internal program settings of the detector, the detector can accurately detect leaked gas in the detection mode. (In the factory calibration mode, the original calibration gas chamber will cover the entire infrared wavelength length of the detector, and the calibration gas can absorb the infrared waves of the entire optical path. At this time, the detector reading value is consistent with the concentration value of the calibration gas.)

[0040] In practical operation, when performing on-site calibration, it is essential to ensure that there is no interfering gas inside the pipeline; otherwise, the accuracy of the calibration will be affected. The gas chamber can be installed and fixed at any position in the optical path, ensuring that the center of the gas chamber is coaxial with the center of the light source.

[0041] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A calibration device for a combustible gas detector installed in a pipeline, characterized in that, include, The calibration block (10) is provided with an air chamber (101). The air chamber (101) is provided with an air inlet (1011) and an air outlet (1012) that connect to the outside. The two opposite sides of the air chamber (101) are provided with a viewing window A (1013) and a viewing window B (1014) along the axial direction. A clamping part (20) is provided on the calibration block (10) for adjusting the position of the calibration block (10) fixed to the gas detector.

2. The calibrating device for a combustible gas detector installed in a pipeline according to claim 1, characterized in that: It also includes a mounting flange (30), which is provided with a mounting hole (301) for the gas detector probe to pass through and be fixed, an inlet (302) for connecting the gas inlet (1011) through a gas pipe, and an outlet (303) for connecting the gas outlet (1012) through a gas pipe.

3. The calibrating device for a combustible gas detector installed in a pipeline according to claim 1, characterized in that: Transparent lenses (40) of the same thickness are respectively sealed and fixed on the viewing window A (1013) and the viewing window B (1014).

4. A calibrating device for a combustible gas detector installed in a pipeline according to claim 3, characterized in that: The viewing window A (1013) and viewing window B (1014) include mounting grooves (50) with the same structure. The transparent lens (40) is installed in the mounting groove (50). An end cap (60) is provided on the outside of the transparent lens. The end cap (60) is fixedly provided on the outside of the mounting groove (50) to press the transparent lens (40). A through hole (601) is provided on the end cap (60). The through hole (601) is located on the same axis as the transparent lens (40).

5. A calibrating device for a combustible gas detector installed in a pipeline according to claim 4, characterized in that: Sealing rings (401) are respectively placed on both sides of the transparent lens (40).

6. A calibrating device for a combustible gas detector installed in a pipeline according to claim 1, characterized in that: The clamping part (20) includes a clamp A (201), and the calibration block (10) is provided with a clamp B (102) that matches the clamp A (201). The clamp A (201) and the clamp B (102) are fixedly connected by fasteners.

7. A calibrating device for a combustible gas detector installed in a pipeline according to claim 6, characterized in that: A clamping groove matching the support rod on the gas detector is provided between the clip A (201) and the clip B (102).

8. A calibrating device for a combustible gas detector installed in a pipeline according to claim 6 or 7, characterized in that, The calibration block (10) is provided with a protrusion (103), and the clip A (201) has a through hole B (2011) that matches the protrusion (103). When the clip A (201) and the clip B (102) are clamped and fixed, the protrusion (103) passes through the through hole B (2011).

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