A sensor calibration tool with airtightness and detachability

Abstract

The utility model discloses a sensor calibration tool with airtightness and detachability, comprising a plurality of gas calibration units, wherein the gas calibration unit comprises a sensor, wherein the sensor is arranged on a central base, a gas calibration channel is arranged between the sensor and the central base, an air inlet channel and an air outlet channel are arranged on the central base, the air inlet channel, the gas calibration channel and the air outlet channel are sequentially connected, a clamping groove is arranged on the central base, a sealing fastener and epoxy resin glue are arranged in the clamping groove, one end of the sensor is arranged in the sealing fastener, the epoxy resin glue in the clamping groove fixes the sealing fastener in the clamping groove, thereby fixing the sensor on the central base, avoiding the presence of a large dead space in a calibration box when the sensor is placed, and improving the accuracy of the calibration; one end of the sensor is arranged inside the sealing fastener, and the other end is exposed to the external environment, thereby facilitating the heat dissipation and disassembly of the sensor.

Description

Technical Field

[0001] The utility model relates to a calibration tool, in particular to an airtight and detachable sensor calibration tool. Background Art

[0002] During the calibration experiment of the cylindrical diffusion gas sensor, the sensor needs to be placed in a sealed calibration box. When standard gases of different concentrations are introduced into the calibration box in turn, due to the large dead space in the calibration box, the actual concentration of the gas in the calibration box is affected by the previous ventilation, which causes a large error in the sensor calibration experiment. Therefore, the ventilation time needs to be greatly increased, resulting in low efficiency and waste of more standard gas. In addition, when the gas sensor is placed in the calibration box, the heat generated by the sensor itself cannot be quickly diffused to the external environment, which increases the internal temperature of the sensor, causing the gas sensor to have zero drift and full-scale drift, resulting in experimental errors. When using the calibration box for calibration, if the gas sensor needs to be calibrated in batches, the installation and removal of the calibration box is inefficient. Utility Model Content

[0003] In view of the above problems, the utility model designs a sensor calibration tool that is airtight and detachable, including several gas calibration units, the gas calibration unit includes a sensor, the sensor is arranged on a central base, a gas calibration channel is arranged between the sensor and the central base, an air inlet channel and an air outlet channel are arranged on the central base, the air inlet channel, the gas calibration channel and the air outlet channel are connected in sequence, the central base is provided with a clamping groove, a sealing fastener and epoxy resin glue are arranged in the clamping groove, and one end of the sensor is arranged in the sealing fastener.

[0004] Compared with the prior art, the utility model has the following beneficial effects: a gas calibration channel is provided between the sensor and the central base, an air inlet channel and an air outlet channel are provided on the central base, gas enters the gas calibration channel from the air inlet channel, and after the sensor calibrates the concentration of the gas, the gas in the gas calibration channel is discharged through the air outlet channel; a clamping groove is provided through the central base, and the epoxy resin glue in the clamping groove fixes the sealing fastener in the clamping groove, thereby fixing the sensor on the central base, so that the calibration part of the sensor calibrates the gas transmitted from the central base, avoiding the presence of a large dead space in the calibration box when the sensor is placed, and improving the accuracy of the calibration; one end of the sensor is arranged inside the sealing fastener, and the other end leaks into the external environment, thereby facilitating the heat dissipation and disassembly of the sensor.

[0005] Furthermore, the clamping groove is an annular groove;

[0006] Preferably, the sealing fastener and the epoxy resin glue are interference-connected with the annular groove.

[0007] The beneficial effect of adopting the above further technical solution is: by making the clamping groove into an annular groove, the sealing fastener and the epoxy resin glue are interference-connected with the annular groove, so that the sealing fastener and the center base are closely matched to prevent gas leakage.

[0008] Furthermore, the sealing fastener is an annular hose, and the height of the sealing fastener is higher than the epoxy resin glue;

[0009] Preferably, the inner diameter of the sealing fastener is equal to the outer diameter of the sensor;

[0010] Preferably, the height of the epoxy resin glue is flush with the clamping groove.

[0011] The beneficial effects of adopting the above-mentioned further technical solution are: the sealing fastener is an annular hose, and the height of the sealing fastener is higher than the epoxy resin glue, so that the lower end of the sealing fastener is fixed in the annular groove by the epoxy resin glue, and the inner diameter of the sealing fastener is equal to the outer diameter of the sensor, so that the sealing fastener is in close contact with the sensor to avoid gas leakage.

[0012] Furthermore, a plurality of support plates are provided on one side of the central base, and bolts are threadedly connected to the support plates, and the bolts are located on one side of the sealing fastener.

[0013] Furthermore, a sealing strip is provided on the edge of the clamping groove.

[0014] The beneficial effect of adopting the above-mentioned further technical solution is: a bolt is threadedly connected on the support plate, and the bolt is located on one side of the sealing fastener. When the sensor is installed, the bolt is rotated to tighten the sealing fastener, so that the sealing fastener and the sensor are in closer contact. A sealing strip is provided on the edge of the clamping groove, and the sealing strip seals the gas calibration channel to further prevent gas leakage.

[0015] Furthermore, the gas calibration channel is cylindrical, a circular groove is provided on the sensor, and the bottom surface of the sensor is arranged horizontally with the upper surface of the center base.

[0016] The beneficial effect of adopting the above-mentioned further technical solution is: by setting the gas calibration channel into a cylindrical shape, a circular groove is opened on the sensor, and the bottom surface of the sensor is horizontally arranged with the upper surface of the center base, so that the circular groove of the sensor is consistent with the gas calibration channel, so that the sensor can accurately calibrate the gas through the gas calibration channel.

[0017] Furthermore, the gas calibration channel is spiral, a circular groove is provided on the sensor, a spiral groove is provided on the central base, the spiral groove cooperates with the sensor to form a spiral continuous channel, and the upper wall of the spiral continuous channel is the lower surface of the sensor;

[0018] Preferably, the air outlet of the spiral continuous channel is located at the center of the spiral continuous channel.

[0019] The beneficial effects of adopting the above further technical solution are: the gas calibration channel is spiral, the spiral groove cooperates with the sensor to form a spiral continuous channel, and the gas is guided through the spiral continuous channel to further avoid gas residue and make the gas calibration more accurate;

[0020] The gas outlet of the spiral continuous channel is located at the center of the spiral continuous channel, so that there will be no gas reflux from the time the gas enters the spiral continuous channel to the time it leaves the spiral continuous channel, thereby further avoiding the interference of the gas at the previous moment on the calibration of the gas at the next moment, thereby making the gas calibration more accurate.

[0021] Furthermore, the gas inlet channel and the gas outlet channel are L-shaped, and the gas outlet of the gas inlet channel and the gas inlet of the gas outlet channel are located at the lower side of the gas calibration channel;

[0022] Preferably, the height of the air inlet of the air inlet channel is greater than or equal to the height of the air outlet of the air outlet channel.

[0023] The beneficial effects of adopting the above-mentioned further technical scheme are as follows: the air inlet channel and the air outlet channel are L-shaped, and the air outlet of the gas inlet channel and the air inlet of the air outlet channel are located on the lower side of the gas calibration channel, so that the gas enters the gas calibration channel through the air inlet channel in turn, and is then discharged from the air outlet channel; the height of the air inlet of the air inlet channel is greater than or equal to the height of the air outlet of the air outlet channel. When the air outlet is lower than the air inlet, it is beneficial for the gas in the gas calibration channel to flow to the air outlet, and it is beneficial to avoid the gas staying in the gas calibration channel.

[0024] Furthermore, a plurality of the gas calibration units are connected in series through a gas pipeline; the gas inlet of the gas calibration unit is the gas inlet of the gas inlet channel, and the gas outlet of the gas calibration unit is the gas outlet of the gas inlet channel;

[0025] The gas outlet of the gas calibration unit is connected to the gas inlet of an adjacent gas calibration unit.

[0026] The beneficial effects of adopting the above-mentioned further technical solution are as follows: a number of gas calibration units are connected in series through a gas pipeline, and the gas is calibrated through multiple sensors in an orderly manner, thereby avoiding the influence caused by the randomness or fluctuation of the calibration of a sensor and improving the accuracy of gas calibration; since there will be no gas reflux or retention when the gas passes through each sensor for calibration, the influence of reduced calibration accuracy caused by the lengthening of the series route is avoided.

[0027] Further, a plurality of the gas calibration units are connected in parallel through the gas channels of the two central bases;

[0028] The air inlet of the gas calibration unit is the air inlet of the air inlet channel, and the air outlet of the gas calibration unit is the air outlet of the air inlet channel; the air inlets of several of the gas calibration units are connected in parallel with the main air inlet pipeline, and the air outlets of several of the gas calibration units are connected in parallel with the main air outlet pipeline.

[0029] The beneficial effect of adopting the above-mentioned further technical solution is as follows: by connecting several gas calibration units in parallel through the gas channels of the two central bases, the amount of calibration gas per unit time is increased, thereby improving the calibration efficiency. Since there will be no gas reflux or retention when the gas passes through each sensor for calibration, the time for the gas to pass through each parallel sensor will not change or fluctuate, thereby avoiding the error of calibration data caused by different flow rates through each sensor during parallel calibration and avoiding the reduction of calibration accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 The figure is an internal side cross-sectional view of a first embodiment of a sensor calibration tooling with airtightness and detachability;

[0031] Figure 2 The three-dimensional structure diagram of a sensor calibration tooling with airtightness and detachability;

[0032] Figure 3 is a top view of the central base of the first embodiment;

[0033] Figure 4 It is an internal side cross-sectional view of a second embodiment of a sensor calibration tooling with airtightness and detachability;

[0034] Figure 5 is a top view of the central base of the second embodiment;

[0035] Figure 6 This is a schematic diagram of the structure of the gas calibration units connected in series in Example 1;

[0036] Figure 7 This is a schematic diagram of the structure of the gas calibration units in parallel in Example 3;

[0037] Among them: 1. Gas calibration unit; 2. Sensor; 3. Center base; 4. Gas calibration channel; 5. Air inlet channel; 6. Air outlet channel; 7. Clamping groove; 8. Sealing fastener; 9. Epoxy resin glue; 10. Support plate; 11. Bolt; 12. Sealing strip; 13. Circular groove; 14. Spiral groove; 15. Main air inlet pipe; 16. Main air outlet pipe. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention.

[0039] Embodiment 1:

[0040] The present embodiment provides a sensor calibration tooling with airtightness and detachability, including a plurality of gas calibration units 1, wherein the gas calibration unit 1 includes a sensor 2, wherein the sensor 2 is arranged on a central base 3, a gas calibration channel 4 is arranged between the sensor 2 and the central base 3, an air inlet channel 5 and an air outlet channel 6 are arranged on the central base 3, and the air inlet channel 5, the gas calibration channel 4 and the air outlet channel 6 are sequentially connected, the gas calibration channel 4 is cylindrical, a circular groove 13 is opened on the sensor 2, and the bottom surface of the sensor 2 and the upper surface of the central base 3 are connected. It is horizontally arranged and cylindrically arranged through the gas calibration channel 4. A circular groove 13 is opened on the sensor 2. The bottom surface of the sensor 2 and the upper surface of the central base 3 are horizontally arranged so that the circular groove 13 of the sensor 2 coincides with the gas calibration channel 4, so that the sensor 2 can accurately calibrate the gas through the gas calibration channel 4; the air inlet channel 5 and the air outlet channel 6 are L-shaped, and the air outlet of the gas inlet channel 5 and the air inlet of the air outlet channel 6 are located on the lower side of the gas calibration channel 4; preferably, the height of the air inlet of the air inlet channel 5 is greater than or equal to the height of the air outlet of the air outlet channel 6.The air inlet channel 5 and the air outlet channel 6 are L-shaped, and the air outlet of the gas inlet channel 5 and the air inlet of the air outlet channel 6 are located at the lower side of the gas calibration channel 4, so that the gas enters the gas calibration channel 4 through the air inlet channel 5 in turn, and then is discharged from the air outlet channel 6; the height of the air inlet of the air inlet channel 5 is greater than or equal to the height of the air outlet of the air outlet channel 6. When the air outlet is lower than the air inlet, it is beneficial for the gas in the gas calibration channel 4 to flow to the air outlet, and it is beneficial to avoid the gas staying in the gas calibration channel 4; the central base 3 is provided with a clamping groove 7, and the clamping groove 7 is provided with a sealing fastener 8 and epoxy resin glue 9, and the clamping groove 7 is an annular groove. Preferably, the sealing fastener 8 and the epoxy resin glue 9 are interference-connected with the annular groove, and the clamping groove 7 is an annular groove. The sealing fastener 8 and the epoxy resin glue 9 are interference-connected with the annular groove, so that the sealing fastener 8 is closely matched with the central base 3 to prevent gas leakage. One end of the sensor 2 is arranged in the sealing fastener 8, and the sealing fastener 8 is an annular hose. The height of the sealing fastener 8 is higher than the epoxy resin glue 9; preferably, the inner diameter of the sealing fastener 8 is equal to the outer diameter of the sensor 2; preferably, the height of the epoxy resin glue 9 is flush with the clamping groove 7, and the sealing fastener 8 is an annular hose, and the height of the sealing fastener 8 is higher than the epoxy resin glue 9, so that the lower end of the sealing fastener 8 is fixed in the annular groove by the epoxy resin glue 9, and the inner diameter of the sealing fastener 8 is equal to the outer diameter of the sensor 2, so that the sealing fastener 8 is closely connected with the sensor 2. touch to avoid gas leakage; a plurality of support plates 10 are provided on one side of the central base 3, and a bolt 11 is threadedly connected to the support plate 10, and the bolt 11 is located on one side of the sealing fastener 8, and a sealing strip 12 is provided on the edge of the clamping groove 7, and a bolt 11 is threadedly connected to the support plate 10, and the bolt 11 is located on one side of the sealing fastener 8. When the sensor 2 is installed, the bolt 11 is rotated to tighten the sealing fastener 8, so that the sealing fastener 8 and the sensor 2 are in closer contact, and a sealing strip 12 is provided on the edge of the clamping groove 7, and the sealing strip 12 seals the gas calibration channel 4 to further prevent gas leakage; a gas calibration channel 4 is provided between the sensor 2 and the central base 3 An air inlet channel 5 and an air outlet channel 6 are provided on the central base 3. The gas enters the gas calibration channel 4 from the air inlet channel 5. After the sensor 2 calibrates the concentration of the gas, the gas in the gas calibration channel 4 is discharged through the air outlet channel 6. A clamping groove 7 is provided through the central base 3. The epoxy resin glue 9 in the clamping groove 7 fixes the sealing fastener 8 in the clamping groove 7, thereby fixing the sensor 2 on the central base 3, so that the calibration part of the sensor 2 calibrates the gas transmitted from the central base 3, avoiding the presence of a large dead space in the calibration box when the sensor 2 is placed, and improving the accuracy of the calibration; one end of the sensor 2 is arranged inside the sealing fastener 8, and the other end is leaked to the external environment, thereby facilitating the heat dissipation and disassembly of the sensor 2.

[0041] Several of the gas calibration units 1 are connected in series through a gas pipeline; the air inlet of the gas calibration unit 1 is the air inlet of the air inlet channel 5, and the air outlet of the gas calibration unit 1 is the air outlet of the air inlet channel 5; the air outlet of the gas calibration unit 1 is connected to the air inlet of an adjacent gas calibration unit 1. Several gas calibration units 1 are connected in series through a gas pipeline, so that the gas sensors 2 can be calibrated in batches, thereby improving the efficiency of gas calibration. The gas is calibrated by passing through multiple sensors 2 in an orderly manner, thereby avoiding the influence of randomness or fluctuation in the calibration of one sensor 2, thereby improving the accuracy of gas calibration; since there will be no gas reflux or retention when the gas passes through each sensor 2 for calibration, the influence of reduced calibration accuracy caused by lengthening the series route is avoided.

[0042] Embodiment 2:

[0043] The same contents as those in the first embodiment are not described in detail here. The differences between the first embodiment and the present embodiment are as follows:

[0044] The present embodiment provides a sensor calibration tool that is airtight and detachable, wherein the gas calibration channel 4 is spiral, a circular groove 13 is provided on the sensor 2, and a spiral groove 14 is provided on the central base 3, wherein the spiral groove 14 cooperates with the sensor 2 to form a spiral continuous channel, and the upper wall of the spiral continuous channel is the lower surface of the sensor 2; preferably, the gas outlet of the spiral continuous channel is located at the center of the spiral continuous channel, and the gas calibration channel 4 is spiral, and the spiral groove 14 cooperates with the sensor 2 to form a spiral continuous channel, and the gas is guided through the spiral continuous channel to further avoid gas residue, thereby making the gas calibration more accurate; the gas outlet of the spiral continuous channel is located at the center of the spiral continuous channel, thereby achieving no gas reflux from the time the gas enters the spiral continuous channel to the time the gas leaves the spiral continuous channel, thereby further avoiding interference of the gas at the previous moment with the calibration of the gas at the next moment, thereby making the gas calibration more accurate.

[0045] Embodiment three:

[0046] The same contents of this embodiment as those of the second embodiment are not repeated here; the differences between this embodiment and the second embodiment are as follows:

[0047] The present embodiment provides a sensor calibration tooling which is airtight and detachable, wherein several of the gas calibration units 1 are connected in parallel through the gas channels of the two central bases 3; the air inlet of the gas calibration unit 1 is the air inlet of the air inlet channel 5, and the air outlet of the gas calibration unit 1 is the air outlet of the air inlet channel 5; the air inlet of several of the gas calibration units 1 is connected in parallel with the main air inlet pipe 15, and the air outlet of several of the gas calibration units 1 is connected in parallel with the main air outlet pipe 16. By connecting several gas calibration units 1 in parallel through the gas channels of the two central bases 3, the amount of calibration gas per unit time is increased, thereby improving the calibration efficiency. Since there will be no gas reflux or retention when the gas passes through each sensor 2 for calibration, the time for the gas to pass through each parallel sensor will not change or fluctuate, thereby avoiding the error of calibration data caused by different flow rates passing through each sensor during parallel calibration, and avoiding the reduction of calibration accuracy.

[0048] The above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit them; based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. Although the utility model is described in detail with reference to the above embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the above embodiments, or replace some of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the utility model.

Claims

1. A gas-tight and detachable sensor calibration tool, comprising a plurality of gas calibration units (1), characterized in that: The gas calibration unit (1) comprises a sensor (2), wherein the sensor (2) is arranged on a central base (3), a gas calibration channel (4) is arranged between the sensor (2) and the central base (3), an air inlet channel (5) and an air outlet channel (6) are arranged on the central base (3), the air inlet channel (5), the gas calibration channel (4) and the air outlet channel (6) are connected in sequence, the central base (3) is provided with a clamping groove (7), a sealing fastener (8) and epoxy resin glue (9) are arranged in the clamping groove (7), and one end of the sensor (2) is arranged in the sealing fastener (8).

2. The airtight and detachable sensor calibration tool according to claim 1, characterized in that: The clamping groove (7) is an annular groove.

3. The airtight and detachable sensor calibration tool according to claim 1, characterized in that: The sealing fastener (8) and the epoxy resin glue (9) are interference-connected with the annular groove.

4. The airtight and detachable sensor calibration tool according to claim 3, characterized in that: The sealing fastener (8) is an annular hose, and the height of the sealing fastener (8) is higher than the epoxy resin glue (9).

5. The airtight and detachable sensor calibration tool according to claim 4, characterized in that: The inner diameter of the sealing fastener (8) is equal to the outer diameter of the sensor (2).

6. The airtight and detachable sensor calibration tool according to claim 5, characterized in that: The height of the epoxy resin glue (9) is flush with the clamping groove (7).

7. The airtight and detachable sensor calibration tool according to claim 4, characterized in that: A plurality of support plates (10) are arranged on one side of the central base (3), and bolts (11) are threadedly connected to the support plates (10), and the bolts (11) are located on one side of the sealing fastener (8).

8. The airtight and detachable sensor calibration tool according to claim 6, characterized in that: A sealing strip (12) is provided on the edge of the clamping groove (7).

9. The airtight and detachable sensor calibration tool according to claim 7, characterized in that: The gas calibration channel (4) is cylindrical, a circular groove (13) is provided on the sensor (2), and the bottom surface of the sensor (2) and the upper surface of the central base (3) are arranged horizontally.

10. The airtight and detachable sensor calibration tool according to claim 7, characterized in that: The gas calibration channel (4) is spiral-shaped, a circular groove (13) is provided on the sensor (2), a spiral groove (14) is provided on the central base (3), the spiral groove (14) cooperates with the sensor (2) to form a spiral continuous channel, and the upper wall of the spiral continuous channel is the lower surface of the sensor (2).

11. The airtight and detachable sensor calibration tool according to claim 10, characterized in that: The air outlet of the spiral continuous channel is located at the center of the spiral continuous channel.

12. The airtight and detachable sensor calibration tool according to claim 9 or 10, characterized in that: The gas inlet channel (5) and the gas outlet channel (6) are L-shaped, and the gas outlet of the gas inlet channel (5) and the gas inlet of the gas outlet channel (6) are located at the lower side of the gas calibration channel (4).

13. The airtight and detachable sensor calibration tool according to claim 12, characterized in that: The height of the air inlet of the air inlet channel (5) is greater than or equal to the height of the air outlet of the air outlet channel (6).

14. The airtight and detachable sensor calibration tool according to claim 13, characterized in that: A plurality of the gas calibration units (1) are connected in series via a gas pipeline; the gas inlet of the gas calibration unit (1) is the gas inlet of the gas inlet channel (5), and the gas outlet of the gas calibration unit (1) is the gas outlet of the gas inlet channel (5); The gas outlet of the gas calibration unit (1) is connected to the gas inlet of an adjacent gas calibration unit (1).

15. The airtight and detachable sensor calibration tool according to claim 14, characterized in that: A plurality of the gas calibration units (1) are connected in parallel via the gases of two central bases (3); The air inlet of the gas calibration unit (1) is the air inlet of the air inlet channel (5), and the air outlet of the gas calibration unit (1) is the air outlet of the air inlet channel (5); the air inlets of several gas calibration units (1) are connected in parallel with the main air inlet pipeline (15), and the air outlets of several gas calibration units (1) are connected in parallel with the main air outlet pipeline (16).

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