A calibration device for a smokemeter

Abstract

The present invention belongs to the technical field of calibration devices, and discloses a calibration device for a smokemeter. The calibration device includes a gas distribution unit and a calibration unit; the gas distribution unit includes a standard substance pool for storing aerosol particles, a first intake pipe for delivering air, and a gas distribution chamber for mixing aerosol particles and air; the calibration unit can be connected to the gas distribution chamber, the calibration unit includes a plurality of calibration chambers, a gas distribution pump is provided between the calibration chamber and the gas distribution chamber, the calibration chamber is connected to the gas distribution pump through a gas transmission pipe, a regulating valve is provided on the gas transmission pipe, and the regulating valve can connect or interrupt the connection between the gas distribution chamber and the calibration chamber; an installation hole is formed in the side wall of the calibration chamber for connecting with a smokemeter sensor, a sealing member is arranged in the installation hole, and a standard particle sensor is arranged inside the calibration chamber for measuring the concentration of the mixed gas inside the calibration chamber. The calibration operation of the present invention is simple, and different concentrations of particulate matter can be calibrated in sequence, with high calibration efficiency and low cost.

Description

Technical Field

[0001] The present invention relates to the technical field of calibration devices, and in particular to a calibration device for a smokemeter. Background Art

[0002] Diesel trucks should be equipped with a remote self-diagnosis system (abbreviation: "OBD system") monitoring device to monitor the particulate emissions at the vehicle tail in real time. However, there are still some early models that do not have the function of detecting particulate emissions. Therefore, it is necessary to install an on-vehicle smokemeter on the tail exhaust pipe of the diesel vehicle to cooperate with the on-vehicle OBD system to monitor the particulate emissions in the vehicle exhaust.

[0003] With the use of the on-vehicle smokemeter, the problem of inaccurate measurement may occur for the smokemeter, and it is necessary for the metrology institution to calibrate the smokemeter of the diesel vehicle to ensure the unity, accuracy and reliability of the equipment measurement value. However, at present, the on-vehicle smokemeter lacks a calibration device, resulting in difficult calibration. Summary of the Invention

[0004] The purpose of the present invention is to provide a calibration device for a smokemeter, which is simple to operate, can calibrate different concentrations of particulate matter in sequence, has high calibration efficiency and low cost.

[0005] To achieve this purpose, the present invention adopts the following technical solutions:

[0006] A calibration device for a smokemeter, comprising:

[0007] An air distribution unit, including a standard substance pool for storing aerosol particulate matter, a first intake pipe for delivering air, and an air distribution chamber for mixing the aerosol particulate matter and the air;

[0008] A calibration unit, which can be connected to the air distribution chamber. The calibration unit includes a plurality of calibration chambers. A gas distribution pump is provided between the calibration chamber and the air distribution chamber. The calibration chamber is connected to the gas distribution pump through a gas transmission pipe. A regulating valve is provided on the gas transmission pipe. The regulating valve can make the air distribution chamber communicate or interrupt the communication with the calibration chamber. An installation hole is provided on the side wall of the calibration chamber for connecting with the sensor of the smokemeter. A sealing member is provided in the installation hole. A standard particle sensor is provided inside the standard chamber for measuring the concentration of the mixed gas inside the calibration chamber. The concentration of the mixed gas in different calibration chambers is different.

[0009] As a preferred solution of a calibration device for a smokemeter, a baffle is provided inside the air distribution chamber. The baffle divides the air distribution chamber into an upper space and a lower space. The standard substance pool is arranged in the upper space and is communicated with the lower space through a delivery pipe.

[0010] As a preferred solution of a calibration device for a smokemeter, an air extraction pump is provided on the first intake pipe, and the air is conveyed to the lower space through the first intake pipe.

[0011] As a preferred solution of a calibration device for a smokemeter, a fan is provided in the lower space.

[0012] As a preferred solution of a calibration device for a smokemeter, an air outlet hole is provided at the bottom of the air distribution chamber, and a filtering component is provided in the air outlet hole. The aerosol particles cannot pass through the filtering component, and the air can pass through the filtering component to discharge from the air distribution chamber.

[0013] As a preferred solution of a calibration device for a smokemeter, at least three calibration chambers are provided.

[0014] As a preferred solution of a calibration device for a smokemeter, an installation bracket is provided inside the installation hole for fixing the sensor of the smokemeter.

[0015] As a preferred solution of a calibration device for a smokemeter, an adjusting intake pipe and an adjusting exhaust pipe are provided at the bottom of the calibration chamber, and the concentration of the mixed gas inside the calibration chamber is adjusted through the adjusting intake pipe and the adjusting exhaust pipe.

[0016] As a preferred solution of a calibration device for a smokemeter, a first control valve is provided on the intake pipe, and a second control valve is provided on the exhaust pipe.

[0017] As a preferred solution of a calibration device for a smokemeter, a display panel is provided on the outer wall of the calibration chamber. The display panel is signal-connected to the standard particle sensor, and the display panel displays the concentration of the mixed gas inside the calibration chamber.

[0018] Beneficial effects:

[0019] In the present invention, aerosol particles inside are released into the air distribution chamber through a calibration pool, and at the same time, external air is introduced into the air distribution chamber through a first intake pipe, so that the aerosol particles and the external air are fully mixed inside the air distribution chamber; the mixed gas inside the air distribution chamber is introduced into the calibration chamber through an air distribution pump, and the communication between the air distribution chamber and the calibration chamber is adjusted or interrupted through a regulating valve; at this time, the calibration chamber is filled with the mixed gas, and a standard particle sensor is provided inside the calibration chamber, which can measure the true concentration of the mixed gas inside in real time; the sensor of the smokemeter is fixed on the side wall of the calibration chamber through a mounting hole and the sensor is connected to the inside of the calibration chamber, and a seal is provided in the mounting hole to prevent the mixed gas inside from overflowing. At this time, the concentration of the mixed gas obtained by the standard particle sensor inside the calibration chamber is the standard smoke concentration value, which is compared with the reading of the measured smokemeter, so as to obtain the indication error of the particulate matter concentration. Because several calibration chambers are provided in the present invention, different concentrations of the mixed gas can be set inside different calibration chambers, and then through sequential concentration measurements, the indication errors of the particulate matter concentration of the smokemeter at different concentrations can be obtained, making the calibration efficiency of the smokemeter higher. In addition, this calibration method saves the standard aerosol particulate matter for calibration and has a low calibration cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic structural diagram of a calibration device for a smokemeter provided by an embodiment of the present invention.

[0021] In the figure:

[0022] 100, air distribution unit; 110, calibration pool; 120, first intake pipe; 121, air extraction pump; 130, air distribution chamber; 131, upper space; 132, lower space; 133, air outlet hole; 134, filter assembly; 140, baffle; 150, delivery pipe; 160, fan;

[0023] 200, calibration unit; 210, calibration chamber; 211, mounting hole; 2111, seal; 212, regulating intake pipe; 2121, first control valve; 213, regulating exhaust pipe; 2131, second control valve; 220, standard particle sensor;

[0024] 300, air distribution pump; 310, gas delivery pipe; 311, regulating valve;

[0025] 400, display panel. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] The present invention will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. In addition, it should be noted that for the sake of description, only parts related to the present invention are shown in the drawings rather than all structures.

[0027] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral body; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "above the", and "on the top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "below the", and "under the" second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0029] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0030] Please refer to the attached Figure 1 , in this embodiment, the calibration device of the smokemeter includes an air distribution unit 100 and a calibration unit 200 in the form of a cuboid box structure. The air distribution unit 100 includes a standard substance pool 110 for storing aerosol particles, a first air inlet pipe 120 for conveying air, and an air distribution chamber 130 for mixing the aerosol particles and air. Those skilled in the art can understand that although the aerosol particles are not the actual particle components of diesel vehicle exhaust emissions, the performance of the aerosol particles (such as light obscuration) can simulate the performance of the particles in exhaust emissions, and thus does not affect the measurement principle of the smokemeter. Accordingly, the aerosol particles can be used to replace the actual particle components of exhaust emissions.

[0031] The calibration unit 200 can be connected to the air distribution chamber 130. The calibration unit 200 includes a number of calibration chambers 210. A gas distribution pump 300 is provided between the calibration chamber 210 and the air distribution chamber 130. The calibration chamber 210 is connected to the gas distribution pump 300 through a gas pipeline 310. A regulating valve 311 is provided on the gas pipeline 310. The regulating valve 311 can connect or interrupt the connection between the air distribution chamber 130 and the calibration chamber 210.

[0032] An installation hole 211 is provided on the side wall of the calibration chamber 210 for connecting with the sensor of the smokemeter. A seal 2111 is provided in the installation hole 211. Preferably, the seal 2111 can be a flexible sealing ring to seal the gap between the sensor of the smokemeter and the installation hole 211. A standard particle sensor 220 is provided inside the standard chamber 210 for measuring the concentration of the mixed gas inside the calibration chamber 210. The concentration of the mixed gas in different calibration chambers 210 is different.

[0033] Specifically, the aerosol particles inside are released into the air distribution chamber 130 through the calibration object pool 110. At the same time, external air is introduced into the air distribution chamber 130 through the first air inlet pipe 120 to fully mix the aerosol particles and the external air inside the air distribution chamber 130. Then, the mixed gas inside the air distribution chamber 130 is introduced into the calibration chamber 210 through the gas distribution pump 130. The regulating valve 311 is used to regulate the connection or interruption between the air distribution chamber 130 and the calibration chamber 210. At this time, the calibration chamber 210 is filled with the mixed gas. A standard particle sensor 220 is provided inside the calibration chamber 210 to measure the real-time concentration of the mixed gas inside. The sensor of the smokemeter is fixed on the side wall of the calibration chamber 210 through the installation hole 211 and the sensor is connected to the inside of the calibration chamber 210. A seal 2111 is provided in the installation hole 211 to prevent the mixed gas inside from overflowing. At this time, the concentration of the mixed gas obtained by the standard particle sensor 220 inside the calibration chamber 210 is the standard smoke concentration value, which is compared with the reading of the measured smokemeter to obtain the indication error of the particulate matter concentration of the smokemeter. Since a number of calibration chambers 210 are provided in the present invention, different concentrations of the mixed gas can be set inside different calibration chambers 210. Then, the sensor is connected to different calibration chambers 210 in turn to obtain the indication error of the particulate matter concentration of the smokemeter at different concentrations, making the calibration efficiency of the smokemeter higher. In addition, this calibration method saves the standard aerosol particulate matter for calibration and has a low calibration cost.

[0034] Optionally, a baffle 140 is provided inside the air distribution chamber 130. The baffle 140 divides the air distribution chamber 130 into an upper space 131 and a lower space 132. The calibration object pool 110 is arranged in the upper space 131 and is communicated with the lower space 132 through a conveying pipe 150. The baffle 140 can provide effective support for the calibration object pool 110. The upper space 131 is used to accommodate the calibration object pool 110, and the lower space 132 is used to fully mix the gas. By dividing the air distribution chamber 130 into the independent upper space 131 and lower space 132 through the baffle 140, the calibration object pool 110 is relatively isolated to avoid being affected by the mixed gas. Preferably, the baffle 140 is made of a stainless steel metal sheet material.

[0035] Preferably, an air extraction pump 121 is provided on the first air inlet pipe 120. Air is conveyed to the lower space 132 through the first air inlet pipe 120. The use of the air extraction pump 121 to actively extract air into the air distribution chamber 130 improves the air inlet rate and further enhances the working efficiency of the entire device.

[0036] Please further refer to the appendix Figure 1 , in this embodiment, a fan 150 is provided in the lower space 132. The fan 150 can ensure the full mixing of aerosol particles and air. Preferably, the fan 150 is suspended on the baffle 140.

[0037] Preferably, an air outlet hole 133 is provided at the bottom of the air distribution chamber 130, and a filtering component 134 is provided in the air outlet hole 133. The aerosol particles cannot pass through the filtering component 134, and the air can pass through the filtering component 134 to discharge from the air distribution chamber 130. In order to make the internal air pressure of the air distribution chamber 130 equal to the external atmospheric pressure, it is communicated with the atmosphere through the air outlet hole 133. The filtering component 134 can prevent the aerosol particles from being discharged out of the air distribution chamber 130 through the air outlet hole 133 and being lost.

[0038] Optionally, at least three calibration chambers 210 are provided, and the concentrations of the mixed gas inside different calibration chambers 210 are different. Please further refer to the appendix Figure 1 , in this embodiment, three calibration chambers 210 are provided. Among them, the three particle concentrations are 20%, 50%, and 80% of the particle concentration range of the smokemeter as the concentration limit values for measuring low concentration, medium concentration, and high concentration in the calibration chamber 210. When calibrating the smokemeter each time, the on-vehicle smokemeter sensor is inserted into the 3 calibration chambers 130 in sequence. The calibration speed is fast, there is no need to repeatedly mix gas each time, the efficiency is high, and aerosol particles are saved; at the same time, multiple concentration measurement points are used for calibration to improve the accuracy. Those skilled in the art can understand that if there are special calibration requirements, the calibration chamber 130 can realize the configuration of any aerosol particle concentration within the measurement range, improving the adaptability of this device.

[0039] Preferably, an installation bracket is provided inside the installation hole 211 for fixing the sensor of the smoke meter.

[0040] Please further refer to the appendix Figure 1 , in this embodiment, an adjustment intake pipe 212 and an adjustment exhaust pipe 213 are provided at the bottom of the calibration chamber 210. The concentration of the mixed gas inside the calibration chamber 210 is adjusted by the adjustment intake pipe 212 and the adjustment exhaust pipe 213. A first control valve 2121 is provided on the intake pipe 212, and a second control valve 2131 is provided on the exhaust pipe 213.

[0041] Specifically, when it is necessary to increase the concentration of the mixed gas in the calibration chamber 210, the first control valve 2121 of the adjustment intake pipe 212 is opened or enlarged, and the second control valve 2131 of the adjustment exhaust pipe 213 is closed or reduced. The concentration of aerosol particles inside the calibration chamber 210 is supplemented through the above operations, so as to increase the concentration of the mixed gas. On the contrary, when it is necessary to reduce the concentration of the mixed gas in the calibration chamber 210, the second control valve 2131 of the adjustment exhaust pipe 213 is opened or enlarged, and the first control valve 2121 of the adjustment intake pipe 212 is closed or reduced. The concentration of aerosol particles inside the calibration chamber 210 is reduced through the above operations, so as to decrease the concentration of the mixed gas.

[0042] Please further refer to the appendix Figure 1 , in this embodiment, a display panel 400 is further provided on the outer wall of the calibration chamber 210. The display panel 400 is signal-connected to the standard particle sensor 220. The display panel 400 displays the concentration of the mixed gas in the calibration chamber 210. The concentration value inside the calibration chamber 210 can be displayed in real time through the display panel 400, which not only facilitates the adjustment of the concentration in the calibration chamber 210, but also facilitates the comparison with the reading of the smoke meter.

[0043] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limitations on the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A calibration device for a smokemeter, characterized in that, it includes: A gas distribution unit (100), including a calibration cell (110) for storing aerosol particles, a first intake pipe (120) for delivering air, and a gas distribution chamber (130) for mixing the aerosol particles with the air; A calibration unit (200) that can communicate with the gas distribution chamber (130). The calibration unit (200) includes a number of calibration chambers (210). A gas distribution pump (300) is provided between the calibration chamber (210) and the gas distribution chamber (130). The calibration chamber (210) is connected to the gas distribution pump (300) through a gas delivery pipe (310). A regulating valve (311) is provided on the gas delivery pipe (310). The regulating valve (311) can make the gas distribution chamber (130) communicate or interrupt communication with the calibration chamber (210); an installation hole (211) is provided on the side wall of the calibration chamber (210) for connecting with the sensor of the smokemeter. A sealing member (2111) is provided in the installation hole (211). A standard particle sensor (220) is provided inside the calibration chamber (210) for measuring the concentration of the mixed gas inside the calibration chamber (210). The concentration of the mixed gas in different calibration chambers (210) is different; a baffle (140) is provided inside the gas distribution chamber (130). The baffle (140) divides the gas distribution chamber (130) into an upper space (131) and a lower space (132). The calibration cell (110) is arranged in the upper space (131) and communicates with the lower space (132) through a delivery pipe (150); an adjusting intake pipe (212) and an adjusting exhaust pipe (213) are provided at the bottom of the calibration chamber (210) to adjust the concentration of the mixed gas inside the calibration chamber (210).

2. The calibration device for a smokemeter according to claim 1, characterized in that, A suction pump (121) is provided on the first intake pipe (120) to deliver the air to the lower space (132) through the first intake pipe (120).

3. The calibration device for a smokemeter according to claim 1, characterized in that, A fan (160) is provided in the lower space (132).

4. The calibration device for a smokemeter according to claim 1, characterized in that, An air outlet hole (133) is provided at the bottom of the gas distribution chamber (130). A filter assembly (134) is provided in the air outlet hole (133). The aerosol particles cannot pass through the filter assembly (134), and the air can pass through the filter assembly (134) to discharge from the gas distribution chamber (130).

5. The calibration device for a smokemeter according to claim 1, characterized in that, At least three calibration chambers (210) are provided.

6. The calibration device for a smokemeter according to claim 1, characterized in that, An installation bracket is provided inside the installation hole (211) for fixing the sensor of the smokemeter.

7. The calibration device for a smokemeter according to claim 1, characterized in that, a first control valve (2121) is provided on the intake pipe (212), and a second control valve (2131) is provided on the exhaust pipe (213).

8. The calibration device for a smokemeter according to claim 1, characterized in that, a display panel (400) is provided on the outer wall of the calibration chamber (210), the display panel (400) is in signal connection with the standard particle sensor (220), and the display panel (400) displays the concentration of the mixed gas in the calibration chamber (210).

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