Gas chamber body for calibration test of household methane gas sensor

Abstract

The utility model relates to a gas chamber body for calibration test of a household methane gas sensor, which comprises a gas chamber outer shell, a gas chamber inner shell and a gas chamber inner shell, an air inlet hole and an air outlet hole are formed in two opposite surfaces of the anti-reflection glass, and sealing glass covers the air inlet hole and the air outlet hole; the sensor mounting bracket is used for mounting a methane gas sensor, a signal transmitted by a transmitting end of the methane gas sensor passes through the anti-reflection glass and methane gas in the gas chamber outer shell to a receiving end to be received, and the methane gas sensor can realize the detection of the concentration of the methane gas in the gas chamber outer shell. According to the gas chamber body for the calibration test of the domestic methane gas sensor, methane gas does not need to be in actual contact with the methane sensor, the penetration rate of sensor light can reach 95% through the glass and the AR film on the glass, and the accuracy of a test result is ensured even if the sensor is not in actual contact with methane; and the test efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to sensor technical field especially is a kind of gas chamber body for domestic methane gas sensor calibration test. BACKGROUND

[0002] The basis of methane gas sensor is the working principle of physical reaction, mainly relying on the molecules of gas to absorb the energy of infrared spectrum, and absorption is only for certain specific spectral wavelength, that is, selective physical absorption. Methane gas sensor is usually composed of infrared emitter and receiver, when methane gas passes through the sensor, it will absorb infrared radiation, and generate an electrical signal, which can be measured and analyzed to determine the concentration of methane.

[0003] After the production and manufacture of methane gas sensor are completed, in order to ensure the quality of the product, certain test is usually needed to ensure that the methane gas sensor leaving the factory is qualified and can be used normally in later period.

[0004] At present, when methane gas sensor is calibrated, the tested object needs to be put into the gas chamber, then methane gas is filled in the gas chamber, and then the test is carried out, after the test is completed, the methane gas needs to be discharged and the material is taken out, which greatly affects the detection efficiency, and causes the problem of low efficiency of methane gas calibration test equipment. CONTENT OF THE UTILITY MODEL

[0005] Therefore, the utility model solves the technical problem that the test method of methane gas sensor in the prior art is to put methane gas sensor into gas chamber for detection by test personnel one by one, which is complicated and low in detection efficiency.

[0006] To solve the above technical problems, the utility model provides a kind of gas chamber body for domestic methane gas sensor calibration test, including: gas chamber shell body, its inside is used to fill in methane gas;Anti-reflection glass is set to two, and two anti-reflection glasses are symmetrically arranged, two anti-reflection glasses are respectively arranged on two opposite faces of gas chamber shell body, gas inlet hole and gas outlet hole are equipped on the other two opposite faces of gas chamber shell body, and sealing glass is covered on the position of gas inlet hole and gas outlet hole;Sensor mounting bracket is arranged outside gas chamber shell body, methane gas sensor is used for installing on the sensor mounting bracket, the emission end and receiving end of methane gas sensor are located on the two sides of two anti-reflection glasses respectively, the signal emitted by the emission end of methane gas sensor is received by the receiving end of methane gas sensor through anti-reflection glass and methane gas in gas chamber shell body, and the methane gas sensor can realize the detection of methane gas concentration in gas chamber shell body.

[0007] In an embodiment of the utility model, the section of the anti -reflective glass is rectangle, and the surface of anti -reflective glass is attached AR film, AR film is used for reducing the reflection of light while enhancing the light transmittance of anti -reflective glass.

[0008] In an embodiment of the utility model, the anti -reflective glass is arranged obliquely, and the included angle between the anti -reflective glass and the inner bottom surface of the gas chamber shell is 82.5 °.

[0009] In an embodiment of the utility model, the gas chamber shell is rectangular box, four side walls of the gas chamber shell are first side wall, second side wall, third side wall and fourth side wall respectively, the first side wall and the second side wall are opposite faces, the third side wall and the fourth side wall are opposite faces, the first side wall and the second side wall are arranged as rectangular opening, the anti -reflective glass is installed at the rectangular opening of first side wall and second side wall, the air inlet hole is arranged on the third side wall, and the air outlet hole is arranged on the fourth side wall.

[0010] In an embodiment of the utility model, the first side wall and the second side wall are arranged obliquely, and the inclination angles of the first side wall and the second side wall are same.

[0011] In an embodiment of the utility model, the air inlet hole is round hole, the third side wall where the air inlet hole is located is equipped with first rectangular mounting groove, and the sealing glass is installed in the first rectangular mounting groove.

[0012] In an embodiment of the utility model, the air outlet hole is round hole, the fourth side wall where the air outlet hole is located is equipped with second rectangular mounting groove, and the sealing glass is installed in the second rectangular mounting groove.

[0013] In an embodiment of the utility model, the anti -reflective glass is transparent glass.

[0014] In an embodiment of the utility model, the bottom surface of the gas chamber shell is equipped with auxiliary air inlet hole, the auxiliary air inlet hole is equipped with third rectangular mounting groove at the position of the outer wall of the gas chamber shell, and the third rectangular mounting groove is installed with sealing glass.

[0015] In an embodiment of the utility model, the outer wall of the bottom of the gas chamber shell is equipped with a plurality of screw holes, and the screw holes are locked to the machine table by screws.

[0016] The above technical scheme of the utility model has the following beneficial effects compared with the prior art:

[0017] The gas chamber body for the calibration test of the domestic methane gas sensor of the utility model does not need to make the methane gas and the methane sensor have the actual contact, and the penetration rate of the sensor light can reach 95% through the glass and the AR film thereon, ensures that even if the sensor and the methane are not actually contacted, the accuracy of the test result is ensured, and the test efficiency is accelerated. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to make the content of the utility model more easily be clearly understood, the following according to the specific embodiment of the utility model and combining with the drawings, the utility model is further detailed, wherein

[0019] Figure 1 The structure diagram of the gas chamber body for the calibration test of the domestic methane gas sensor in the preferred embodiment of the utility model Figure One ;

[0020] Figure 2 The structure diagram of the gas chamber body for the calibration test of the domestic methane gas sensor in the preferred embodiment of the utility model Figure Two ;

[0021] Figure 3 The bottom view of the gas chamber body for the calibration test of the domestic methane gas sensor in the preferred embodiment of the utility model;

[0022] Figure 4 The sectional view of the preferred embodiment of the utility model in A-A direction Figure 3 ;

[0023] Figure 5 The top view of the gas chamber body for the calibration test of the domestic methane gas sensor in the preferred embodiment of the utility model;

[0024] Figure 6 The sectional view of the preferred embodiment of the utility model in C-C direction Figure 5 ;

[0025] Figure 7 The structure diagram of the gas chamber outer shell in the preferred embodiment of the utility model;

[0026] Figure 8 The structure diagram of the gas chamber body for the calibration test of the domestic methane gas sensor in the preferred embodiment of the utility model when being applied.

[0027] Description of the drawing of the specification: gas chamber outer shell 1, air inlet hole 11, air outlet hole 12, first side wall 13, second side wall 14, third side wall 15, first rectangular mounting groove 151, fourth side wall 16, second rectangular mounting groove 161, auxiliary air inlet hole 17, third rectangular mounting groove 171, screw hole 18, anti-reflection glass 2, sealing glass 3, sensor mounting bracket 4, methane gas sensor 5. DETAILED DESCRIPTION

[0028] The utility model will be further explained in connection with the drawings and specific embodiments, so that the person skilled in the art can better understand the utility model and can be implemented, but the embodiment is not as the limitation of the utility model.

[0029] Referring to Figures 1-7 The utility model discloses a gas chamber body for domestic methane gas sensor calibration test, including: gas chamber outer shell body 1, its inside is used for filling in methane gas, the antireflection glass 2 is set to two, and two antireflection glass 2 symmetric setting, the antireflection glass 2 is transparent glass, two antireflection glass 2 are set respectively on the two opposite faces of gas chamber outer shell body 1, the other two opposite faces of gas chamber outer shell body 1 are equipped with air inlet hole 11 and air outlet hole 12, the air inlet hole 11 and air outlet hole 12 position are all covered with sealing glass 3, the sensor mounting bracket 4 is set to the outside of gas chamber outer shell body 1, the sensor mounting bracket 4 is used to install methane gas sensor 5, the emission end and the receiving end of methane gas sensor 5 are located at the two sides of two antireflection glass 2 respectively, the signal of the emission end of methane gas sensor 5 is received by the receiving end of methane gas sensor 5 through the antireflection glass 2 and the methane gas in gas chamber outer shell body 1, and the methane gas sensor 5 can realize the detection of the methane gas concentration in gas chamber outer shell body 1. Two antireflection glass 2 and gas chamber outer shell body 1 form a sealed cavity as a whole, fill in methane gas through the air inlet hole 11 of setting, and the gas can be discharged through the air outlet hole 12. The material of gas chamber outer shell body 1 is preferably aluminum alloy.

[0030] In the above structure, the cross section of the antireflection glass 2 is rectangular, and the surface of the antireflection glass 2 is attached with an AR film, which is used to reduce the reflection of light and enhance the light transmission of the antireflection glass 2. The AR film pasted on the surface of the antireflection glass 2 can reduce the reflection of light, and the light transmittance can reach 95%. When the methane gas is calibrated and tested, the methane gas sensor 5 does not directly contact the methane gas, thereby accelerating the test efficiency.

[0031] In the above structure, the antireflection glass 2 is inclined, and the included angle between the antireflection glass 2 and the inner bottom surface of the gas chamber body is 82.5°.

[0032] In summary, the sealed gas chamber formed by the two pieces of anti-reflection glass 2 and the gas chamber shell 1 is sealed by the sealing glass 3 after being filled with the gas of the required concentration. During the test, the methane gas sensor 5 is not in direct contact with the methane, but transmits light through the anti-reflection glass 2 of the gas chamber. In addition, considering the reflection of light, the anti-reflection glass 2 and the bottom surface of the gas chamber shell 1 are arranged in an inclined state, and an AR film is attached to the surface of the anti-reflection glass 2 to enhance the light transmission.

[0033] Referring to Figure 1 , 2 As shown in the figure, the gas chamber shell 1 is a rectangular box, the four side walls of the gas chamber shell 1 are respectively a first side wall 13, a second side wall 14, a third side wall 15 and a fourth side wall 16, the first side wall 13 and the second side wall 14 are opposite surfaces, the third side wall 15 and the fourth side wall 16 are opposite surfaces, the first side wall 13 and the second side wall 14 are arranged as rectangular openings, the anti-reflection glass 2 is installed at the rectangular openings of the first side wall 13 and the second side wall 14, the gas inlet hole 11 is arranged on the third side wall 15, and the gas outlet hole 12 is arranged on the fourth side wall 16. The first side wall 13 and the second side wall 14 are arranged in an inclined state, and the inclination angles of the first side wall 13 and the second side wall 14 are the same. The first side wall 13 and the second side wall 14 are symmetrically arranged along the center line of the gas chamber shell 1.

[0034] In the above structure, the gas inlet hole 11 is a circular hole, the third side wall 15 where the gas inlet hole 11 is located is provided with a first rectangular mounting groove 151, and the sealing glass 3 is mounted in the first rectangular mounting groove 151. The gas outlet hole 12 is a circular hole, the fourth side wall 16 where the gas outlet hole 12 is located is provided with a second rectangular mounting groove 161, and the sealing glass 3 is mounted in the second rectangular mounting groove 161. Preferably, the gas outlet hole 12 and the gas inlet hole 11 are on the same straight line, and the diameters of the gas outlet hole 12 and the gas inlet hole 11 are both 5mm. The sealing glass 3 is bonded to the bottom surface of the first rectangular mounting groove 151 and the second rectangular mounting groove 161 by means of dispensing, and the sealing glass 3 covers the gas outlet hole 12 and the gas inlet hole 11.

[0035] In the above structure, the bottom surface of the gas chamber shell 1 is provided with an auxiliary gas inlet hole 17, the auxiliary gas inlet hole 17 is provided with a third rectangular mounting groove 171 at the position of the outer wall of the gas chamber shell 1, and the third rectangular mounting groove 171 is provided with the sealing glass 3.

[0036] In the above structure, the outer wall of the bottom of the gas chamber shell 1 is provided with a plurality of screw holes 18, and the screw holes 18 are locked to the machine table by screws.

[0037] The working principle of the gas chamber body for calibrating and testing the household methane gas sensor is as follows:

[0038] 1. Apply silicone to the outer perimeter of the outer casing 1 of the aluminum alloy outer shell. Place the anti-reflective glass 2 into the grooves on the two opposite sides of the outer casing 1. Note that the anti-reflective glass 2 should be tilted at a certain angle.

[0039] 2. The outlet 12 is connected to the vacuum pumping device, and the inlet 11 is connected to the methane standard gas cylinder. While the outlet 12 is being evacuated, the inlet 11 is simultaneously filled with methane until the concentration inside the gas chamber reaches the required theoretical value. The gas chamber will remain stable at one standard atmosphere.

[0040] 3. Apply silicone around the air inlet 11 and air outlet 12, place the sealing glass 3 into the groove of the air inlet 11 and air outlet 12, press firmly until the glue dries.

[0041] 4. For example Figure 8 As shown, the methane sensor 5 is mounted on the sensor mounting bracket 4, so that the sensor mounting bracket 4 is above the gas chamber. The light emitted by the methane sensor 5 passes through the gas chamber, the reflector, the gas chamber, and the sensor receiving end, which can simulate the sensor's condition under the corresponding methane concentration environment.

[0042] The above scheme, which forms a sealed air chamber consisting of the outer shell 1 and the anti-reflective glass 2, only requires sealing the holes of the air inlet 11 and the air outlet 12 with glass after the gas is filled in, making the assembly of the entire air chamber convenient and quick.

[0043] The sealing glass 3 is applied to the holes of the air inlet 11 and air outlet 12 by applying adhesive, which ensures the overall sealing of the air chamber and also guarantees its lifespan.

[0044] When calibrating a methane gas sensor, the original method of placing it in the gas chamber for actual contact with methane gas, which required a certain amount of time for both loading and unloading, can be changed to indirect contact with methane gas. The sensor only needs to be placed above the gas chamber, and the light emitted by the sensor travels back and forth through the glass in the gas chamber, thus simulating the sensor's condition in a methane environment.

[0045] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A gas chamber for calibration testing of a household methane gas sensor, characterized in that, include: The outer casing of the gas chamber is used to fill methane gas. The anti-reflective glass consists of two pieces arranged symmetrically. The two pieces of anti-reflective glass are respectively located on two opposite surfaces of the outer casing of the air chamber. An air inlet and an air outlet are provided on the other two opposite surfaces of the outer casing of the air chamber. Sealing glass covers the positions of the air inlet and the air outlet. A sensor mounting bracket is disposed outside the outer casing of the gas chamber. The mounting bracket is used to mount a methane gas sensor. The transmitter and receiver of the methane gas sensor are located on opposite sides of two anti-reflective glass plates. The signal emitted by the transmitter of the methane gas sensor passes through the anti-reflective glass plates and the methane gas inside the outer casing of the gas chamber, and is received by the receiver of the methane gas sensor. The methane gas sensor can detect the concentration of methane gas inside the outer casing of the gas chamber.

2. The gas chamber for calibration testing of a household methane gas sensor according to claim 1, characterized in that: The anti-reflective glass has a rectangular cross-section, and an AR film is attached to the surface of the anti-reflective glass. The AR film is used to reduce light reflection while enhancing the light transmittance of the anti-reflective glass.

3. The gas chamber for calibration testing of a household methane gas sensor according to claim 1, characterized in that: The anti-reflective glass is inclined, and the angle between the anti-reflective glass and the bottom surface of the inner shell of the outer casing is 82.5°.

4. The gas chamber for calibration testing of a household methane gas sensor according to claim 1, characterized in that: The outer casing of the air chamber is a rectangular box. The four side walls of the outer casing are a first side wall, a second side wall, a third side wall, and a fourth side wall. The first side wall and the second side wall are opposite to each other, and the third side wall and the fourth side wall are opposite to each other. The first side wall and the second side wall are set with rectangular openings. The anti-reflective glass is installed at the rectangular openings of the first side wall and the second side wall. The air inlet is located on the third side wall, and the air outlet is located on the fourth side wall.

5. The gas chamber for calibration testing of a household methane gas sensor according to claim 4, characterized in that: The first sidewall and the second sidewall are inclined, and the inclination angles of the first sidewall and the second sidewall are the same.

6. The gas chamber for calibration testing of a household methane gas sensor according to claim 4, characterized in that: The air inlet is a round hole, and a first rectangular mounting groove is provided on the third side wall where the air inlet is located. The sealing glass is installed in the first rectangular mounting groove.

7. The gas chamber for calibration testing of a household methane gas sensor according to claim 4, characterized in that: The vent is a round hole, and a second rectangular mounting groove is provided on the fourth side wall where the vent is located. The sealing glass is installed in the second rectangular mounting groove.

8. The gas chamber for calibration testing of a household methane gas sensor according to claim 1, characterized in that: The anti-reflective glass is transparent glass.

9. The gas chamber for calibration testing of a household methane gas sensor according to claim 1, characterized in that: An auxiliary air inlet is provided on the bottom surface of the outer casing of the air chamber. A third rectangular mounting groove is provided on the outer wall of the outer casing of the air chamber for the auxiliary air inlet. A sealing glass is installed in the third rectangular mounting groove.

10. The gas chamber for calibration testing of a household methane gas sensor according to claim 1, characterized in that: The outer wall at the bottom of the outer casing of the air chamber is provided with several screw holes, which are then tightened to the machine base by screws.

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