Thermal interference test equipment and method for flame detector based on blackbody radiation source

Abstract

The present invention discloses a flame detector thermal interference test device and method based on a blackbody radiation source. The blackbody radiation furnace is arranged on a radiation furnace moving platform on one side of an optical dark box in a height-adjustable manner, and the emission port of the optical dark box is butted against the light input port of the blackbody radiation furnace; the sample stage is slidably installed in the blackbody radiation furnace; the steps are: using the blackbody radiation furnace as a radiation source, butting the emission port of the radiation furnace against the dark box port, and injecting the blackbody radiation into the dark box along the optical axis; installing the flame detector sample on the sample support and aligning it with the optical axis; the distance between the sample sensitive element and the blackbody radiation source meets the illumination condition; if the detector generates a false alarm signal or a fault signal under the specified thermal interference severity level condition, the test result is judged as non-compliant. The present invention makes up for the deficiency that the current national standard for flame detectors does not have requirements for the anti-thermal interference performance of detectors, and realizes the quantitative evaluation of the anti-thermal interference performance of flame detectors under different severity levels.

Description

Technical Field

[0001] The invention relates to a thermal interference test technology in the field of fire protection, in particular to a flame detector thermal interference test device and method based on a black body radiation source. Background Art

[0002] Flame detectors mainly detect the occurrence of fire by detecting the light radiation generated by flame combustion, and can be divided into: infrared type, ultraviolet type, and multi-band type. In recent years, flame detectors have been widely used in tunnels, industries, vehicles and ships, and cultural relics protection. In the above application environments, on the one hand, the flame detector itself or the objects within its monitoring range will generate heat after being exposed to sunlight, which will cause thermal interference to the detector; on the other hand, flame detectors are mainly used in places with flammable and explosive materials. The thermal interference in such places mainly comes from electrical equipment and pipeline containers, etc. The self-heating of electrical equipment, pipelines and containers will also cause thermal interference to the detector. These thermal interferences will have a certain impact on the response performance of the flame detector, which may cause the detector to falsely alarm, miss alarms, or even blind the detector. However, the current national standard for flame detectors does not require the detector's anti-thermal interference performance.

[0003] Although the thermal interference sources in the environment are diverse in form and nature, the effect of the thermal interference they may emit can be estimated by the upper temperature limit requirements of such facilities. However, no estimation method that can meet the above design ideas has been reported yet. Summary of the invention

[0004] In view of the shortcomings of the prior art that thermal interference will have a certain impact on the response performance of the flame detector, which may cause false alarms, missed alarms, and even blinding of the detector, the technical problem to be solved by the present invention is to provide a flame detector thermal interference test equipment and method based on a blackbody radiation source. Through the analysis of common thermal interference sources and equivalent blackbody radiation simulation, the quantitative evaluation of the flame detector's anti-thermal interference performance under different harsh conditions can be achieved.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is as follows:

[0006] The invention provides a flame detector thermal interference test device based on a blackbody radiation source, comprising an optical dark box, a blackbody radiation furnace and a sample stage, wherein the blackbody radiation furnace is arranged on a radiation furnace moving stage on one side of the optical dark box in a height-adjustable manner, and an emission port of the optical dark box is connected to a light input port of the blackbody radiation furnace through a light shield; and the sample stage is slidably installed in the blackbody radiation furnace.

[0007] One end of the optical dark box is provided with a dark box opening panel, an upper folding baffle and a lower folding baffle, and the upper and lower ends of the dark box opening panel are softly connected to the end frame of the optical dark box through the upper folding baffle and the lower folding baffle respectively; the dark box opening panel is provided with an alignment bracket fixing hole.

[0008] A chopper is provided at the dark box opening of the dark box opening panel of the optical dark box. The chopper is a rotatable fan blade structure. The fan blade rotation axis is located on one side of the optical axis of the black body radiation source, and the fan blade part sweeps across the dark box opening by rotation.

[0009] The rear end of the light shield is fixedly connected to the radiation furnace emission port of the radiation furnace, and the front end is butted against the dark box port panel; L-shaped alignment brackets are provided on both sides of the light shield, one end of the two alignment brackets is respectively fixed to the two sides of the rear end of the light shield, and the other end is fixedly installed on the two sides of the mounting plate at the bottom end of the black body radiation furnace.

[0010] The present invention also provides a flame detector thermal interference test method based on a black body radiation source, comprising the following steps:

[0011] 1) Use a black body radiation furnace as the radiation source, and fix the positions of the emission port of the black body radiation furnace and the dark box port panel;

[0012] 2) Use a light shield to connect the radiation furnace emission port with the dark box port, and the black body radiation is emitted into the dark box along the optical axis direction;

[0013] 3) Install the flame detector sample on a height-adjustable sample support, and align the sample sensitive element with the optical axis by adjusting the support up and down;

[0014] 4) Adjust the distance between the sample sensitive element and the black body radiation source on the optical rail by sliding the sliding seat on the optical rail back and forth, and observe the indication of the radiometer at this distance to ensure that the sample sensitive element is under the irradiance conditions specified in the test;

[0015] 5) Observe the working conditions of the samples under the above-mentioned thermal interference simulation conditions. If the detector generates a false alarm signal or a fault signal under the specified thermal interference severity level conditions, the test results shall be judged as non-compliant.

[0016] To fix the positions of the black body radiation furnace emission port and the dark box port panel, specifically:

[0017] The position of the radiation furnace emission port is adjusted by the radiation furnace moving platform and the radiation furnace support, and the height of the dark box port panel is adjusted by telescoping the upper folding baffle and the lower folding baffle to align the radiation furnace emission port with the dark box port, and the relative position is fixed by inserting the front end of the alignment bracket into the alignment bracket fixing point provided on the dark box port panel.

[0018] The present invention has the following beneficial effects and advantages:

[0019] 1. The flame detector thermal interference test equipment and method based on black body radiation source provided by the present invention make up for the deficiency that the current national standard for flame detectors does not put forward requirements for the anti-thermal interference performance of detectors.

[0020] 2. The method of the present invention is used to verify the anti-thermal interference performance of the detector, an equivalent blackbody radiation model of various common thermal interferences is established, and the severity level of the thermal interference test is divided into different levels. The quantitative evaluation of the anti-thermal interference performance of the flame detector under different severity levels is realized. The test results verify the effectiveness of the test method. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of the flame detector thermal interference test equipment based on the black body radiation source of the present invention;

[0022] Figure 2 It is a schematic diagram of the structure of the black body radiation furnace in the device of the present invention;

[0023] Figure 3 It is a schematic diagram of the dark box opening panel in the device of the present invention;

[0024] Figure 4 It is a front view of the chopper in the device of the present invention;

[0025] Figure 5 for Figure 4 Side view of

[0026] Figure 6 It is a schematic diagram of the experimental arrangement in the method of the present invention;

[0027] Figure 7 450K black body radiation response curve diagram in the method of the present invention;

[0028] Figure 8 550K black body radiation response curve diagram in the method of the present invention;

[0029] Fig. 9 700K blackbody radiation response curve diagram in the method of the present invention.

[0030] Among them, 1 is a blackbody radiation furnace, 2 is a radiation furnace handle, 3 is a radiation furnace emission port, 4 is an alignment bracket, 5 is a radiation furnace support, 6 is a radiation furnace moving platform, 7 is a light shield, 8 is a chopper, 9 is an optical dark box, 10 is an optical slide rail, 11 is a blackbody radiation input direction, 12 is an optical axis, 13 is a flame detector sample, 14 is a sample support, 15 is a sliding seat, 16 is a plane where the sample sensitive element is located, 16a is a sample sensitive element, 17 is a position adjustment direction of the sliding seat, 18 is a dark box moving platform, 19 is a radiation furnace switch, 20 is a radiation furnace temperature display window, 21 is a dark box port panel, 22 is a dark box port panel, 23 is a lower folding baffle, 24 is an alignment bracket fixing point, 25 is a blackbody radiation surface, 26 is a chopper blade, 27 is a chopper support, and 28 is a motor. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0032] like Figure 1 As shown, the present invention provides a flame detector thermal interference test equipment based on a blackbody radiation source, comprising an optical dark box 9, a blackbody radiation furnace 1 and a sample stage, wherein the blackbody radiation furnace 1 is arranged on a radiation furnace moving stage 6 on one side of the optical dark box 9 in a height-adjustable manner, and the emission port of the optical dark box 9 is connected to the light input port of the blackbody radiation furnace 1 through a light shield 7; the sample stage is slidably installed in the blackbody radiation furnace 1.

[0033] like Figure 3 As shown, one end of the optical dark box 9 is provided with a dark box opening panel 21, an upper folding baffle 22 and a lower folding baffle 23, and the upper and lower ends of the dark box opening panel 21 are softly connected to the end frame of the optical dark box 9 through the upper folding baffle 22 and the lower folding baffle 23 respectively; the dark box opening panel 21 is provided with an alignment bracket fixing hole 24.

[0034] like Figures 4-5 As shown, a chopper 8 is provided at the darkbox opening of the darkbox opening panel 21 of the optical darkbox 9. The chopper 8 includes a rotatable chopper blade 26, a chopper support 27 and a motor 28. The motor 28 is fixedly mounted on the upper end of the chopper support 27. The chopper blade 26 is rotatably mounted on the output shaft of the motor 28 via a rotating shaft. The rotating shaft is located on one side of the optical axis of the blackbody radiation source. The chopper blade 26 sweeps across the darkbox opening by rotating.

[0035] In this embodiment, the flame detector thermal interference test equipment based on the black body radiation source is mainly divided into two parts:

[0036] 1) Blackbody radiation source component, its main functions are:

[0037] Through the black body radiation furnace 1 and the light shield 7, the black body radiation of a specific temperature is modulated by the chopper 8 along the direction of the radiation furnace emission port 3 and then emitted into the dark box port of the optical dark box 9. In order to ensure that the radiation furnace emission port 3 is aligned with the dark box port, the height of the black body radiation furnace 1 is adjusted by using the height-adjustable radiation furnace support 3, and the height of the dark box port is adjusted by manually operating the upper folding baffle 22 on the upper part of the dark box port panel 21 or the lower folding baffle 23 on the lower part. After the radiation furnace emission port 3 is aligned with the dark box port, the alignment bracket 4 is used to fix the position of the radiation furnace support 5 and the dark box port panel 21, ensuring that the center of the radiation furnace emission port 3 and the center of the sample sensitive element 16a are on the same optical axis 12.

[0038] 2) Thermal interference test assembly, its main functions are:

[0039] The black body radiation output by the black body radiation source assembly is injected into the optical dark box 9 through the dark box port, and the distance between the flame detector sample 13 to be tested and the incident black body radiation is adjusted along the optical axis through the optical slide rail 10, the sliding seat 15 and the sample support 14 with adjustable height. At the same time, the irradiance at each sliding position is measured by a radiometer installed at a position adjacent to the sample sensitive element 16a (at the same distance from the sample sensitive element 16a to the radiation source) until the specific irradiance value required by the test is reached.

[0040] The relationship between blackbody radiation flux density and temperature and wavelength is described by Planck's formula:

[0041]

[0042] Wherein, Mb represents the flux density of spectral radiation, λ is the wavelength, T is the absolute temperature of the black body, h=6.626×10-34J·S is Planck's constant, k=1.380649×10-34J / K is the Boltzmann constant, and c=299792458m / s is the speed of light.

[0043] Since the black body is an ideal model, for general objects, its emissivity and absorptivity represent the ability of the material to radiate and absorb energy. The emissivity ε represents the ratio of the radiation flux density M of a non-black body to the radiation flux density Mb of a black body at the same temperature. The emissivity is related to the type of material, surface state, temperature T, etc., and also to the wavelength λ:

[0044] ε(λ,T)=M(λ,T) / M b (λ,T) (2)

[0045] According to Kirchhoff's law, at a given temperature, the absorptivity α of an object is equal to the emissivity ε, that is, α(λ,T)=ε(λ,T). The emissivity or absorptivity of common substances is shown in Table 1.

[0046] Table 1 General emissivity of common materials

[0047]

[0048] According to the Stepan-Boltzmann law, integrating the Planck formula over the entire band can reflect the relationship between the blackbody radiation flux density M and the temperature T:

[0049] M(T)=σ×T 4 (3)

[0050] Among them, σ = 5.67×10-8W·m-2·K-4 is the Stepan-Boltzmann constant.

[0051] Equivalent blackbody radiation model of thermal interference

[0052] In the engineering application of flame detectors, thermal interference mainly comes from two aspects: the first is the heat generated by various electrical equipment, pipelines and containers in industrial sites; the second is the heat generated by the detector itself or objects within its monitoring range after being exposed to sunlight.

[0053] The first type of heat-generating materials are mainly steel, alloys, copper and other metals; the second type of heat-generating materials may include the above metals as well as non-metals such as concrete, asphalt, gravel, wood, rubber, plastic, glass, etc. Based on the data in Table 1, this paper sets the upper limit emissivity / absorptivity of the first type of heat interference materials to ε1=α1=0.9 and the upper limit emissivity / absorptivity of the second type of heat interference materials to ε2=α2=0.95 without loss of generality.

[0054] Since the first type of thermal interference source can be considered to be mainly various types of explosion-proof equipment, its maximum surface temperature level is shown in the relevant provisions of the second row of Table 2. According to formulas (2) and (3), it can be obtained:

[0055]

[0056] Among them, Tn corresponds to the highest surface temperature of T1 to T6 in Table 1. Therefore, the equivalent black body radiation source temperature corresponding to T1 to T6 can be calculated, see the fourth row of Table 2.

[0057] Table 2 IEC / GB3836 Maximum surface temperature and equivalent black body temperature of explosion-proof equipment

[0058]

[0059] The highest temperature of the second type of thermal interference source can be considered as the temperature of the object at thermal equilibrium under the condition of maximum solar radiation on the surface. According to the extraterrestrial radiation reference constant Ens0 = 1367W / m2 provided by the World Meteorological Organization (WMO), and according to the observation data of the China Meteorological Data Network, the maximum daily irradiance Em of the total surface radiation generally does not exceed 1000W / m2. Therefore, according to formulas (2) and (3), it can be obtained:

[0060]

[0061] Among them, Em is taken as 1000W / m2. When the energy of solar radiation absorbed by the object is balanced with the energy emitted, the thermal interference source is equivalent to a black body temperature of about 359.8K, which is equivalent to 87℃.

[0062] Flame detector thermal interference test

[0063] 1) Severity level of thermal interference test

[0064] Since the second type of thermal interference is common in outdoor environments, objects near the detector may be heated by sunlight for more than 1 hour, and there may be short-term and multiple periodic shielding between the heating body and the detector. The temperature changes caused by the appearance and disappearance of thermal interference may cause false alarms or blinding of the detector. Therefore, considering the above factors, the setting of the first level of severity is shown in the second row of Table 3. Detectors that meet this severity level can be considered to have the ability to resist the heat interference of sunlight in outdoor environments and the thermal interference of T1 and T2 explosion-proof equipment.

[0065] On the basis of meeting the first severity level of thermal interference, the second to fourth severity levels are set for the first type of thermal interference of higher level, simulating T3-T4 level thermal interference (severity level 2), T5 level thermal interference (severity level 3) and T6 level thermal interference (severity level 4) respectively. According to the general installation and use requirements of the detector, the distance between the first type of thermal interference source and the detector is usually more than 1.5m. This type of thermal interference mainly comes from the response of each band of blackbody radiation to the sensitive element of the detector. When this response is confused with the response judgment of the detector to the flame, it may cause false alarm or missed alarm. Therefore, the test time only needs to meet the alarm recognition window time, and it does not take a long time to reach the thermal equilibrium state. In addition, since there is also the possibility of low severity level conditions in a high severity level environment, in order to meet a certain severity level requirement, it is necessary to first meet the requirements of each low severity level in turn. The specific test requirements are shown in rows 3 to 5 of Table 3.

[0066] Table 3 Flame detector thermal interference black body radiation source simulation severity level

[0067]

[0068] 2) Thermal interference response performance of the detector

[0069] In order to test the effect of thermal interference on flame detectors, a test device was constructed using pyroelectric infrared elements that are sensitive to 5.0um, 4.5um and 3.8um wavelength infrared radiation. Figure 6 In the arrangement shown, the sensitive element of the test device and the light source are kept on the same optical axis, and the distance D is 1.5m. The chopping frequency of the modulator is 10 times / s. The black body radiation sources with temperatures of 450K, 550K and 700K are tested respectively. The response of the device of the present invention is shown in Figures 7 to 9 As shown, the dotted line represents the 3.8um wavelength response, the solid line represents the 4.5um wavelength response, and the dotted line represents the 5.0um wavelength response.

[0070] The present invention also provides a flame detector thermal interference test method based on a black body radiation source, comprising the following steps:

[0071] 1) A black body radiation furnace 1 is used as a radiation source, and the positions of the black body radiation furnace emission port 3 and the dark box port panel 21 are fixed. Specifically, the position of the radiation furnace emission port 3 is adjusted by the radiation furnace moving platform 6 and the radiation furnace support 5, and the height of the dark box port panel 21 is adjusted by telescoping the upper folding baffle 22 and the lower folding baffle 23, so that the radiation furnace emission port 3 is aligned with the dark box port 8, and the front end of the alignment bracket 4 is inserted into the alignment bracket fixing point 24 provided on the dark box port panel 21 to achieve the fixation of the relative position.

[0072] 2) The radiation furnace emission port 3 is connected to the dark box port 4 by using a light shield 7, and the black body radiation is emitted into the dark box 9 along the direction of the optical axis 12;

[0073] 3) Mount the flame detector sample 13 on a height-adjustable sample support 14, and align the sample sensitive element with the optical axis by adjusting the support 14 up and down;

[0074] 4) Adjust the distance between the sample sensitive element 16a and the black body radiation source on the optical slide rail 10 by sliding the sliding seat 15 on the optical track back and forth, and observe the indication of the radiometer at the distance to ensure that the sample sensitive element 16a is under the irradiance conditions specified in the test;

[0075] 5) Observe the working conditions of the samples under the above-mentioned thermal interference simulation conditions. If the detector generates a false alarm signal or a fault signal under the specified thermal interference severity level conditions, the test results shall be judged as non-compliant.

[0076] In this embodiment, the test steps of the severe level 1 condition (Table 3) are:

[0077] 1) According to Figure 6 The detector sample is fixed on the sample support 14. By adjusting the height of the sample support 14 and the radiation furnace support 5, the center of the radiation furnace emission port 3 and the center of the sample sensitive element 16a are on the same optical axis 12. By adjusting the sliding seat 15, the radiation distance between the plane 16 where the sample sensitive element is located and the black body radiation surface 25 is maintained at 0.3m;

[0078] 2) Start the black body radiation furnace 1, and heat the temperature of the black body radiation furnace 1 from room temperature to 87°C at a heating rate of 1°C / min, and maintain the temperature for 1 hour; during the test, observe whether the flame detector sample 13 sends out a fire alarm signal or a fault signal. If such a signal is sent out, the sample is judged to be unqualified;

[0079] 3) After completing step 2), the chopper 8 is used to apply chopping with a frequency of 1 Hz, 5 Hz, and 10 Hz for 1 minute each, during which the flame detector sample is observed to see whether it sends out a fire alarm signal or a fault signal. If such a signal is sent out, the sample is judged to be unqualified;

[0080] 4) Apply a flame that meets the alarm conditions to the sample at a distance of about 0.1 m from the plane 16 where the sample sensitive element is located on the optical axis 12, and observe whether the flame detector sample 13 sends out a fire alarm signal. If no fire alarm signal is sent out, the sample is judged to be unqualified;

[0081] 5) After the flame detector sample 13 stops being exposed to black body radiation and recovers for 5 minutes, a flame that meets the alarm condition is applied to the flame detector sample 13. During this period, observe whether the flame detector sample 13 sends out a fire alarm signal. If no fire alarm signal is sent out, the sample is judged to be unqualified;

[0082] 2. Test steps for severe level 2 conditions (Table 3):

[0083] 1) Carry out the test according to the test steps of severe level 1 conditions;

[0084] 2) The radiation distance between the plane 16 where the sample sensitive element is located and the black body radiation surface 25 is maintained at 1.5 m by adjusting the sliding seat 15;

[0085] 3) The black body radiation furnace 1 is heated to 177°C at a rate of 10°C / min and maintained at this temperature for 5 minutes; during the test, observe whether the flame detector sample 13 sends out a fire alarm signal or a fault signal. If such a signal is sent out, the sample is judged to be unqualified;

[0086] 4) After completing step 2), the chopper 8 is used to apply chopping with a frequency of 1 Hz, 5 Hz, and 10 Hz for 1 minute each, during which the flame detector sample 13 is observed to see whether it sends out a fire alarm signal or a fault signal. If such a signal is sent out, the sample is judged to be unqualified;

[0087] 5) At a distance of about 1.0 m from the plane 16 where the sample sensitive element is located on the optical axis 12, a flame meeting the alarm condition is applied to the flame detector sample 13, and during the process, it is observed whether the flame detector sample 13 sends out a fire alarm signal. If no fire alarm signal is sent out, the flame detector sample 13 is judged to be unqualified;

[0088] 6) After the flame detector sample 13 stops being affected by black body radiation and recovers for 5 minutes, a flame that meets the alarm conditions is applied to the flame detector sample 13. During this period, observe whether the flame detector sample 13 sends out a fire alarm signal. If no fire alarm signal is sent, the flame detector sample 13 is judged to be unqualified.

[0089] 3. Test steps for severe level 3 conditions (Table 3):

[0090] 1) Carry out the test according to the test steps of severe level 1 conditions;

[0091] 2) Carry out the test according to the test steps of severe level 2 conditions;

[0092] 3) Continue to raise the temperature of the radiation furnace to 277°C at a heating rate of 20°C / min and maintain this temperature for 5 minutes. During the test, observe whether the flame detector sample 13 sends out a fire alarm signal or a fault signal. If such a signal is sent out, the flame detector sample 13 is judged to be unqualified;

[0093] 4) After completing step 3), use the chopper 8 to apply chopping at frequencies of 1 Hz, 5 Hz, and 10 Hz for 1 minute each. During this period, observe whether the flame detector sample sends out a fire alarm signal or a fault signal. If such a signal is sent out, it is determined that the flame detector sample 13 is unqualified.

[0094] 5) At a distance of about 1.0 m from the plane 16 where the sample sensitive element is located on the optical axis 12, a flame meeting the alarm condition is applied to the sample, and during this period, it is observed whether the flame detector sample 13 sends out a fire alarm signal. If no fire alarm signal is sent out, the flame detector sample 13 is judged to be unqualified;

[0095] 6) After the flame detector sample 13 stops being affected by black body radiation and recovers for 5 minutes, a flame that meets the alarm conditions is applied to the flame detector sample 13. During this period, observe whether the flame detector sample 13 sends out a fire alarm signal. If no fire alarm signal is sent, the flame detector sample 13 is judged to be unqualified.

[0096] 4. Test steps for severe level 4 conditions (Table 3):

[0097] 1) Carry out the test according to the test steps of severe level 1 conditions;

[0098] 2) Carry out the test according to the test steps of severe level 2 conditions;

[0099] 3) Carry out the test according to the test steps of severe level 3 conditions;

[0100] 4) Continue to heat the radiation furnace to 427°C at a heating rate of 20°C / min and maintain this temperature for 5 minutes; during the test, observe whether the flame detector sample 13 sends out a fire alarm signal or a fault signal. If such a signal is sent out, the flame detector sample 13 is judged to be unqualified;

[0101] 5) After completing step 4), the chopper 8 is used to apply chopping with a frequency of 1 Hz, 5 Hz, and 10 Hz for 1 minute each, during which the flame detector sample 13 is observed to see whether it sends out a fire alarm signal or a fault signal. If such a signal is sent out, the flame detector sample 13 is determined to be unqualified;

[0102] 6) At a distance of about 1.0 m from the plane 16 where the sample sensitive element is located on the optical axis 12, a flame meeting the alarm condition is applied to the flame detector sample 13, and during this period, it is observed whether the flame detector sample 13 sends out a fire alarm signal. If no fire alarm signal is sent out, the flame detector sample 13 is judged to be unqualified;

[0103] 7) After the flame detector sample 13 stops being affected by black body radiation and recovers for 5 minutes, a flame that meets the alarm conditions is applied to the sample. During this period, observe whether the flame detector sample 13 sends out a fire alarm signal. If no fire alarm signal is sent, the flame detector sample 13 is judged to be unqualified.

[0104] The present invention applies specific examples to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for general technicians in this field, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope.

Claims

1. A flame detector thermal interference test equipment based on a black body radiation source, characterized in that: It includes an optical dark box, a black body radiation furnace and a sample stage, wherein the black body radiation furnace is arranged on a radiation furnace moving stage on one side of the optical dark box in a height-adjustable manner, and the emission port of the optical dark box and the light input port of the black body radiation furnace are connected through a light shield; the sample stage is slidably installed in the black body radiation furnace; One end of the optical dark box is provided with a dark box opening panel, an upper folding baffle and a lower folding baffle, and the upper and lower ends of the dark box opening panel are softly connected to the end frame of the optical dark box through the upper folding baffle and the lower folding baffle respectively; the dark box opening panel is provided with an alignment bracket fixing hole; A chopper is provided at the dark box opening of the dark box opening panel of the optical dark box. The chopper is a rotatable fan blade structure. The fan blade rotation axis is located on one side of the optical axis of the black body radiation source. The fan blade part sweeps across the dark box opening by rotation. The rear end of the light shield is fixedly connected to the radiation furnace emission port of the radiation furnace, and the front end is butted against the dark box port panel; L-shaped alignment brackets are provided on both sides of the light shield, one end of the two alignment brackets is respectively fixed to the two sides of the rear end of the light shield, and the other end is fixedly installed on the two sides of the mounting plate at the bottom end of the black body radiation furnace.

2. The flame detector thermal interference test method based on a blackbody radiation source according to claim 1 is characterized in that The following steps are involved: 1) Use a black body radiation furnace as the radiation source, and fix the positions of the black body radiation furnace emission port and the dark box port panel; 2) Use a light shield to connect the radiation furnace emission port with the dark box port, and the black body radiation is emitted into the dark box along the optical axis direction; 3) Install the flame detector sample on a height-adjustable sample holder, and align the sample sensitive element with the optical axis by adjusting the holder up and down; 4) Adjust the distance between the sample sensitive element and the black body radiation source on the optical rail by sliding the sliding seat on the optical rail back and forth, and observe the indication of the radiometer at this distance to ensure that the sample sensitive element is under the irradiance conditions specified in the test; 5) Observe the working conditions of the samples under the above-mentioned thermal interference simulation conditions. If the detector generates a false alarm signal or a fault signal under the specified thermal interference severity level conditions, the test results shall be judged as non-compliant.

3. The flame detector thermal interference test method based on a blackbody radiation source according to claim 2 is characterized in that Fix the positions of the blackbody radiation furnace emission port and the dark box port panel, specifically: The position of the radiation furnace emission port is adjusted by the radiation furnace moving platform and the radiation furnace support, and the height of the dark box port panel is adjusted by telescoping the upper folding baffle and the lower folding baffle to align the radiation furnace emission port with the dark box port, and the relative position is fixed by inserting the front end of the alignment bracket into the alignment bracket fixing point provided on the dark box port panel.

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