Dynamic and static dual calibration device for dust instrument

Abstract

The invention discloses a dynamic and static dual calibration device for a dust meter, which comprises a low-concentration dust environment simulation device, the low-concentration dust environment simulation device comprises a rack, the rack is provided with a detection chamber, the upper part of the detection chamber is communicated with a dust feeding cylinder, and the upper end of the dust feeding cylinder is communicated with a dust generating device and a blowing mechanism; a grid plate is arranged in the detection chamber and divides the detection chamber into an upper-layer chamber and a lower-layer chamber, a fixed support is further arranged on the grid plate, a first air outlet is formed in the side wall of the lower-layer chamber and connected with a first filtering device and a first air extractor, and a second air outlet is formed in the upper-layer chamber and connected with a second filtering device and a second air extractor; the second air outlet is fixedly connected with an air supply pipe, a jet device is arranged in the air supply pipe, the downstream of the horizontal wind tunnel is connected with a second filtering device and a second air extractor, the horizontal wind tunnel is provided with a wind speed detector and a detection head installation window, and the device can meet the dynamic and static dual calibration requirements of the dust instrument and is higher in accuracy.

Description

Technical Field

[0001] The invention relates to the technical field of dust meter calibration, in particular to a dynamic and static dual calibration device for a dust meter. Background Art

[0002] At present, the existing dust environment simulation equipment directly sends the generated dust into the relevant container, and then completes the detection through the detection unit. At the same time, the simulation equipment can also be used to calibrate the detection element. However, using the above method, the dust is poorly distributed in the container, which not only affects the accuracy of the detection, but also the calibration accuracy of the detection element is low, which will also affect the detection effect in subsequent use.

[0003] The applicant previously applied for a low-concentration dust environment simulation detection device, with the authorization announcement number CN217111950U. The public document records a low-concentration dust environment simulation detection device, but this simulation detection device is suitable for static calibration of dust meters, that is, the dust meter is placed in the detection room, the dust in the detection room is evenly diffused, and the dust flow is very slow, which ensures the uniformity of dust diffusion in the detection room. In this way, the detection and calibration results are more accurate.

[0004] However, some dust meters have special usage scenarios. For example, when detecting the concentration of smoke exhaust in a chimney, it is necessary to sample the chimney smoke at a constant speed when detecting the dust inside the smoke stack. In other words, it is necessary to sample from the chimney at a sampling speed equal to the chimney smoke exhaust speed and then input it into the dust meter for concentration detection. Therefore, the dynamic accuracy requirements for dust meters are also higher. However, the accuracy of the detection results of dust meters in a static environment cannot represent the detection accuracy in a dynamic environment. Therefore, there is currently no dual calibration device that can meet both dynamic and static requirements. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a dynamic and static dual calibration device for a dust meter, which can simultaneously meet the dynamic and static dual calibration requirements of the dust meter, so that the detection accuracy of the dust meter is higher.

[0006] In order to solve the above technical problems, the technical solution of the present invention is: a dynamic and static dual calibration device for a dust meter, including a low-concentration dust environment simulation device, the low-concentration dust environment simulation device includes a frame, a detection chamber is arranged on the frame, the upper part of the detection chamber is connected with a vertically arranged dust feeding barrel, the upper end of the dust feeding barrel is connected with a dust generating device and a blowing mechanism, the air outlet direction of the blowing mechanism is tangent to the dust feeding barrel; a grid plate for placing the dust meter is arranged in the detection chamber, the grid plate divides the detection chamber into an upper chamber and a lower chamber, the grid plate is also provided with a fixed support for fixing the sampling head of the filter membrane sampling device, the lower chamber A first air outlet is arranged on the side wall, and the first air outlet is connected to a first filtering device and a first exhaust device. A second air outlet is arranged on the side wall of the upper chamber, and the second air outlet is fixedly connected to an air supply pipe, and the air supply pipe is connected to the air inlet end of the horizontal wind tunnel. An ejector of a jet pump is arranged in the air supply pipe, and the outlet of the ejector is connected to the horizontal wind tunnel, and the air suction port of the jet pump is connected to the air supply pipe. A second filtering device and a second exhaust device are connected downstream of the horizontal wind tunnel. A wind speed detector and a detection head installation window are arranged on the horizontal wind tunnel, and the detection head installation window is used to fix the sampling head of the standard detection instrument and the sampling head of the detection instrument to be calibrated.

[0007] As a preferred solution, the air supply pipe includes a straight pipe section and a closed pipe section, the straight pipe section is fixed to the side wall of the upper chamber through a flange, the large diameter end of the closed pipe section is connected to the straight pipe section, the ejector of the jet pump is fixed in the straight pipe section, the bottom of the straight pipe section is provided with a compressed air inlet of the ejector, an external box is also fixed to the outside of the straight pipe section, and a working pump of the jet pump is fixed in the external box.

[0008] As a preferred solution, the horizontal wind tunnel includes a flared pipe section and a horizontal uniform flow straight pipe section, the small diameter end of the flared pipe section is connected to the large diameter end of the closed pipe section, the large diameter end of the flared pipe section is connected to the horizontal uniform flow straight pipe section, and the detection head installation window and the wind speed detector are both arranged on the horizontal uniform flow straight pipe section.

[0009] As a preferred solution, the detection head installation window is arranged at the upper part of the horizontal uniform flow straight pipe section, and an upper cover plate is detachably installed on the detection head installation window, and the sampling head of the fixed standard detection instrument and the sampling head of the detection instrument to be calibrated are fixed on the upper cover plate.

[0010] As a preferred solution, a first sampling tube and a second sampling tube are fixed on the upper cover plate, the lower ends of the first sampling tube and the second sampling tube extend into the interior of the horizontal uniform flow straight pipe section, the lower end pipe openings of the first sampling tube and the second sampling tube are horizontally arranged and face the air inlet side, and the upper ends of the first sampling tube and the second sampling tube are respectively connected to the sampling head of the standard testing instrument and the sampling head of the testing instrument to be calibrated.

[0011] As a preferred solution, the lower end opening of the first sampling tube and the lower end opening of the second sampling tube are on the same cross section, and the lower end opening of the first sampling tube and the lower end opening of the second sampling tube are close to the center of the horizontal uniform flow straight pipe section and are arranged symmetrically on the left and right.

[0012] As a preferred solution, the horizontal uniform flow straight pipe section is also provided with a temperature probe and a humidity probe, and the expanded pipe section is also provided with an air supply port for replenishing warm and humid air, and the air supply port is connected to the warm and humid air supply system.

[0013] As a preferred solution, the horizontal wind tunnel is fixed on a mobile bracket, and a universal wheel is provided at the bottom of the mobile bracket.

[0014] As a preferred solution, a pneumatic valve is provided between the air supply pipe and the air inlet end of the horizontal wind tunnel.

[0015] As a preferred solution, the first filter device and the second filter device are the same filter device, and the first air pumping device and the second air pumping device are the same power device.

[0016] After adopting the above technical scheme, the effect of the present invention is as follows: since the grid plate divides the detection chamber into an upper chamber and a lower chamber, a fixed support for fixing a sampling head of a filter membrane sampling device is also provided on the grid plate, a first air outlet is provided on the side wall of the lower chamber, the first air outlet is connected to a first filtering device and a first exhaust device, a second air outlet is provided on the side wall of the upper chamber, an air supply pipe is fixedly connected to the second air outlet, the air supply pipe is connected to an air inlet end of a horizontal wind tunnel, an ejector of a jet pump is provided in the air supply pipe, the outlet of the ejector is connected to the horizontal wind tunnel, the air suction port of the jet pump is connected to the air supply pipe, and a second filter is connected to the downstream of the horizontal wind tunnel. The device and the second exhaust device, the horizontal wind tunnel is provided with an anemometer and a detection head installation window, the detection head installation window is used to fix the sampling head of the standard detection instrument and the sampling head of the detection instrument to be calibrated, therefore, when performing static calibration, it is only necessary to place the dust meter to be calibrated on the grid plate, at this time, it can be calibrated by the filter membrane method or the standard dust meter, when the filter membrane method is used for calibration, it is only necessary to fix the filter membrane sampling head on the fixed support, and then after sampling for a certain period of time, the filter membrane is weighed to obtain the weight change before and after use, and the particle concentration can be obtained, and then the particle concentration of the dust meter to be calibrated is compared and calibrated with the particle concentration obtained by the filter membrane method. When calibrating with the standard dust meter, it is only necessary to place another standard detection instrument on the grid plate, and compare and calibrate the data between the two instruments. When dynamic calibration is required, the dust generating device and the blowing mechanism send the particles into the upper chamber, and the particles will be evenly dispersed in the upper chamber after passing through the dust feeding tube. At this time, the ejector of the jet pump is used to suck the dust-containing gas in the upper chamber into the air supply pipe. Since the particles have undergone a uniform diffusion and distribution process in the upper chamber, the uniformity of the dust-containing gas sucked into the air supply pipe is higher. Then the dust-containing gas is sent into the horizontal wind tunnel through the air supply pipe, and the second exhaust device downstream of the horizontal wind tunnel provides a constant suction force, so that the dust-containing gas The dust gas flows evenly in the horizontal wind tunnel, and the wind speed detector can detect the current flow rate. Then the sampling heads of the standard test instrument and the test instrument to be calibrated are inserted into the wind tunnel through the test head installation window, and sampling is performed at the specified wind speed to achieve dynamic calibration. In this way, the flow rate of different horizontal wind tunnels can be changed by controlling the power of the second exhaust device, so that calibration can be performed at different wind speeds within the measuring range to improve the calibration effect. The dynamic and static dual calibration device can meet the dynamic and static dual calibration of the instrument, and the calibration effect is better.

[0017] Furthermore, since the air supply pipe includes a straight pipe section and a closed pipe section, the straight pipe section is fixed to the side wall of the upper chamber through a flange, the large diameter end of the closed pipe section is connected to the straight pipe section, the straight pipe section is fixed with an ejector of the jet pump, the bottom of the straight pipe section is provided with a compressed air inlet of the ejector, and an external box is fixed to the outside of the straight pipe section, and the working pump of the jet pump is fixed in the external box. The ejector is used to suck the dust-containing air in the upper chamber into the air supply pipe, and the gas passes through the closed pipe section and then enters the horizontal wind tunnel, where it will diffuse once to achieve a uniform distribution effect.

[0018] Furthermore, since the horizontal wind tunnel includes a flared pipe section and a horizontal uniform flow straight pipe section, the small diameter end of the flared pipe section is connected to the large diameter end of the closed pipe section, and the large diameter end of the flared pipe section is connected to the horizontal uniform flow straight pipe section, the detection head installation window and the wind speed detector are both arranged on the horizontal uniform flow straight pipe section, and the closed pipe section of the air supply duct shrinks and enters a flared pipe section, so that the dust is more evenly distributed and flows on the horizontal uniform flow straight pipe section. The detection head installation window and the wind speed detector are both arranged on the horizontal uniform flow straight pipe section, so that the detected wind speed is more accurate. At the same time, the dust-containing gas particles sampled by the sampling head installed in the detection head installation window are also more evenly distributed, ensuring the accuracy of the calibration result.

[0019] Since the detection head installation window is arranged at the upper part of the horizontal uniform flow straight pipe section, an upper cover plate is detachably installed on the detection head installation window, and the sampling head of the fixed standard detection instrument and the sampling head of the detection instrument to be calibrated are fixed on the upper cover plate. The detection head installation window can facilitate the installation and fixation of the sampling head of the standard detection instrument and the sampling head of the detection instrument to be calibrated.

[0020] Furthermore, since the first sampling tube and the second sampling tube are fixed on the upper cover plate, the lower ends of the first sampling tube and the second sampling tube extend into the interior of the horizontal uniform flow straight pipe section, the lower end openings of the first sampling tube and the second sampling tube are horizontally arranged and face the air inlet side, and the upper ends of the first sampling tube and the second sampling tube are respectively connected to the sampling head of the standard detection instrument and the sampling head of the detection instrument to be calibrated. Therefore, the first sampling tube and the second sampling tube can be fixed on the upper cover plate in advance and the position of the lower end openings can be adjusted to face the air inlet side, so as to be consistent with the sampling state in the chimney, so that the sampling head of the standard detection instrument and the sampling head of the detection instrument to be calibrated can be directly connected to the first sampling tube and the second sampling tube, so that the detection operation is simpler and more convenient.

[0021] Furthermore, since the lower end opening of the first sampling tube and the lower end opening of the second sampling tube are on the same cross section, the lower end opening of the first sampling tube and the lower end opening of the second sampling tube are close to the center of the horizontal uniform flow straight pipe section and are arranged symmetrically on the left and right, the sampling consistency of the first sampling tube and the second sampling tube is better, and therefore, the error in the sampling process of the standard detection instrument and the detection instrument to be calibrated is smaller.

[0022] Since the horizontal uniform flow straight pipe section is also provided with a temperature probe and a humidity probe, the expanded pipe section is also provided with an air supply port for replenishing warm and humid air, and the air supply port is connected to the warm and humid air supply system, the dust-containing gas in the horizontal wind tunnel can simulate the dust-containing gas of a certain temperature and humidity, which is closer to the gas environment in the chimney, and the effect after calibration is better.

[0023] Furthermore, since the horizontal wind tunnel is fixed on the mobile bracket and the bottom of the mobile bracket is provided with universal wheels, the horizontal wind tunnel can be conveniently moved.

[0024] Furthermore, since a pneumatic valve is provided between the air supply pipe and the air inlet end of the horizontal wind tunnel, when static calibration is required, the pneumatic valve can be closed to completely isolate the horizontal wind tunnel and the upper chamber. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0026] Figure 1 is a structural stereogram of a dual calibration device according to an embodiment of the present invention;

[0027] Figure 2 is a schematic diagram of the side structure of a dual calibration device according to an embodiment of the present invention;

[0028] Figure 3 It is a three-dimensional diagram of a low-concentration dust environment simulation device;

[0029] Figure 4 It is a structural stereogram of a horizontal wind tunnel;

[0030] Figure 5 It is a schematic diagram of the end face of a horizontal wind tunnel;

[0031] Figure 6 yes Figure 5 Sectional view at AA;

[0032] In the attached drawings: 1. frame; 2. dust feeding barrel; 21. air supply hood; 22. conical cylinder; 23. straight cylinder; 24. neck; 3. detection chamber; 31. upper chamber; 32. lower chamber; 4. dust generating device; 5. blowing mechanism; 51. blower; 52. filter cartridge; 53. air supply pipe; 6. first air outlet; 7. air supply pipe; 71. straight pipe section; 72. closed pipe section; 8. external box; 81. jet pump; 9. horizontal wind tunnel; 91. flared pipe section; 92. horizontal uniform flow straight pipe section; 93. detection head installation window; 94. upper cover; 95. first sampling tube; 96. second sampling tube; 10. wind speed detector; 11. movable bracket; 12. second filtering device; 13. fixed support. DETAILED DESCRIPTION

[0033] The present invention is further described in detail below through specific examples.

[0034] like Figure 1-6 As shown, a dynamic and static dual calibration device for a dust meter includes a low-concentration dust environment simulation device, the low-concentration dust environment simulation device includes a frame 1, a detection chamber 3 is arranged on the frame 1, the upper part of the detection chamber 3 is connected with a vertically arranged dust feeding barrel 2, the upper end of the dust feeding barrel 2 is connected with a dust generating device 4 and a blowing mechanism 5, the air outlet direction of the blowing mechanism 5 is tangent to the dust feeding barrel 2; a grid plate for placing the dust meter is arranged in the detection chamber 3, the grid plate divides the detection chamber 3 into an upper chamber 31 and a lower chamber 32, the grid plate is also provided with a fixed support 13 for fixing the sampling head of the filter membrane sampling device, and a side wall of the lower chamber 32 is provided with a There is a first air outlet 6, the first air outlet 6 is connected to a first filtering device and a first exhaust device, a second air outlet is arranged on the side wall of the upper chamber 31, the second air outlet is fixedly connected to an air supply pipe 7, the air supply pipe 7 is connected to the air inlet end of the horizontal wind tunnel 9, an ejector of a jet pump 81 is arranged in the air supply pipe 7, the outlet of the ejector is connected to the horizontal wind tunnel 9, the air suction port of the jet pump 81 is connected to the air supply pipe 7, a second filtering device 12 and a second exhaust device are connected downstream of the horizontal wind tunnel 9, a wind speed detector 10 and a detection head installation window 93 are arranged on the horizontal wind tunnel 9, and the detection head installation window 93 is used to fix the sampling head of the standard detection instrument and the sampling head of the detection instrument to be calibrated.

[0035] In this embodiment, the air supply pipe 7 includes a straight pipe section 71 and a closed pipe section 72, the straight pipe section 71 is fixed to the side wall of the upper chamber 31 through a flange, the large diameter end of the closed pipe section 72 is connected to the straight pipe section 71, the ejector of the jet pump 81 is fixed in the straight pipe section 71, the bottom of the straight pipe section 71 is provided with a compressed air inlet of the ejector, the outside of the straight pipe section 71 is also fixed with an external box 8, and the working pump of the jet pump 81 is fixed in the external box 8. Usually, the jet pump 81 includes a working pump and an ejector.

[0036] The horizontal wind tunnel 9 includes a flared pipe section 91 and a horizontal uniform flow straight pipe section 92. The small diameter end of the flared pipe section 91 is connected to the large diameter end of the closed pipe section 72, and the large diameter end of the flared pipe section 91 is connected to the horizontal uniform flow straight pipe section 92. The detection head installation window 93 and the wind speed detector 10 are both arranged on the horizontal uniform flow straight pipe section 92. In addition, the detection head installation window 93 is arranged on the upper part of the horizontal uniform flow straight pipe section 92, and an upper cover plate 94 is detachably installed on the detection head installation window 93, and the sampling head of the fixed standard detection instrument and the sampling head of the detection instrument to be calibrated are fixed on the upper cover plate 94. The first sampling tube 95 and the second sampling tube 96 are fixed on the upper cover plate 94. The lower ends of the first sampling tube 95 and the second sampling tube 96 extend into the interior of the horizontal uniform flow straight pipe section 92. The lower ends of the first sampling tube 95 and the second sampling tube 96 are arranged horizontally and face the air inlet side. The upper ends of the first sampling tube 95 and the second sampling tube 96 are connected to the sampling head of the standard test instrument and the sampling head of the test instrument to be calibrated, respectively. The lower end of the first sampling tube 95 and the lower end of the second sampling tube 96 are on the same cross section. The lower end of the first sampling tube 95 and the lower end of the second sampling tube 96 are close to the center of the horizontal uniform flow straight pipe section 92 and are arranged symmetrically on the left and right.

[0037] When in use, the first sampling tube 95 and the second sampling tube 96 can be pre-fixed on the upper cover plate 94 and the position of the lower end pipe mouth can be adjusted to face the air inlet side, so as to be consistent with the sampling state in the chimney. In this way, the sampling head of the standard detection instrument and the sampling head of the detection instrument to be calibrated can be directly connected to the first sampling tube 95 and the second sampling tube 96.

[0038] The horizontal uniform flow straight pipe section 92 is also provided with a temperature probe and a humidity probe, and the expanded pipe section 91 is also provided with an air supply port for supplying warm and humid air, and the air supply port is connected to the warm and humid air supply system. The horizontal wind tunnel 9 is fixed on the mobile bracket 11, and the bottom of the mobile bracket 11 is provided with a universal wheel. A pneumatic valve is provided between the air supply pipe 7 and the air inlet end of the horizontal wind tunnel 9.

[0039] In this embodiment, the first filter device and the second filter device 12 can be the same filter device, and the first air extraction device and the second air extraction device can also be the same power device. The first air extraction device and the second air extraction device are fans.

[0040] The dust feeding barrel 2 includes a straight barrel portion 23 and a conical barrel portion 22, the straight barrel portion 23 is connected to the detection chamber 3, the large end of the conical barrel portion 22 is connected to the straight barrel portion 23, an air supply hood 21 is provided at the upper end of the conical barrel section, and a closed neck 24 is provided at the lower end of the air supply hood 21 and connected to the small diameter end of the conical barrel portion 22.

[0041] The structure of the dust generating device 4 in this embodiment can be seen in detail in the scheme recorded in CN202020319771.8. The blowing mechanism 5 includes an air supply pipe 53, and the upper end of the air supply pipe 53 is connected to the air supply hood 21; a fan box is also fixed on the frame 1, and the fan box is arranged on one side of the feeding barrel. A blower 51 is provided in the fan box, and the blower 51 is connected to a filter cartridge 52, and the filter cartridge 52 is connected to the air supply pipe 53, thereby providing clean air to provide air supply power.

[0042] When performing static calibration, the pneumatic valve is closed to completely isolate the horizontal wind tunnel 9 and the upper chamber 31. The dust meter to be calibrated only needs to be placed on the grid plate. It can be calibrated by the membrane filter method or the standard dust meter. When using the membrane filter method, it is only necessary to fix the membrane filter sampling head on the fixed support 13. After sampling for a certain period of time, the filter membrane is weighed to obtain the weight change before and after use, and the particle concentration can be obtained. Then, the particle concentration of the dust meter to be calibrated is compared and calibrated with the particle concentration obtained by the membrane filter method. When using the standard dust meter for calibration, it is only necessary to place another standard detection instrument on the grid plate and compare and calibrate the data between the two instruments.

[0043] When dynamic calibration is required, the dust generating device 4 and the blowing mechanism 5 send the particles into the upper chamber 31. After passing through the dust feeding tube 2, the particles will be evenly dispersed in the upper chamber 31. At this time, the ejector of the jet pump 81 is used to suck the dust-containing gas in the upper chamber 31 into the air supply pipe 7. Since the particles have undergone a uniform diffusion and distribution process in the upper chamber 31, the uniformity of the dust-containing gas sucked into the air supply pipe 7 is higher. Then, the dust-containing gas is sent into the horizontal wind tunnel 9 through the air supply pipe 7. The horizontal wind tunnel 9 The second exhaust device downstream provides a constant suction force, so that the dust-containing gas flows evenly in the horizontal wind tunnel 9. The wind speed detector 10 can detect the current flow rate. The sampling head of the standard detection instrument and the sampling head of the detection instrument to be calibrated are directly connected to the first sampling tube 95 and the second sampling tube 96, and sampling is performed at a specified wind speed to achieve dynamic calibration. In this way, the flow rate of different horizontal wind tunnels 9 can be changed by controlling the power of the second exhaust device, so as to perform calibration at different wind speeds within the measuring range, and the calibration effect is better.

[0044] The present application can simulate dust environments under different temperatures, humidity and wind speeds in the horizontal wind tunnel 9 through the greenhouse air supply system and the second air extraction device, so that more factors are considered during calibration, and the calibration effect is better and more accurate. The humidity difference is considered first, then the temperature difference, and finally the wind speed difference, which is the selection principle.

[0045] The gas circuit system, actuators such as servo motors, gear transmission mechanisms, and lead screw nut mechanisms mentioned in this embodiment are all current conventional technologies. The specific structures and principles and other designs of cylinders, motors, and other transmission mechanisms are disclosed in detail in the "Mechanical Design Manual, Fifth Edition", the 28th printing of the fifth edition in Beijing in April 2008, which belongs to the prior art and its structure is clear. The SMC training textbook "Modern Practical Pneumatic Technology, 3rd Edition" published by the Machinery Industry Press on August 1, 2008 discloses vacuum components, gas circuits, and program control in detail, indicating that the gas circuit structure in this embodiment is also an existing technology and is clear. The book "Motor Drive and Speed ​​Regulation" published by the Chemical Industry Press on July 1, 2015 also introduces the control of the motor and the travel switch in detail. Therefore, the circuit and gas circuit connections are clear.

[0046] The above-described embodiments are merely descriptions of preferred implementations of the present invention and are not intended to limit the scope of the present invention. Various modifications and alterations to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the scope of protection defined by the claims of the present invention.

Claims

1. A dynamic and static dual calibration device for a dust meter, comprising a low-concentration dust environment simulation device, the low-concentration dust environment simulation device comprising a frame, a detection chamber is arranged on the frame, a vertically arranged dust feeding barrel is connected above the detection chamber, a dust generating device and a blowing mechanism are connected at the upper end of the dust feeding barrel, and the air outlet direction of the blowing mechanism is tangent to the dust feeding barrel; a grid plate for placing a dust meter is arranged in the detection chamber, the grid plate divides the detection chamber into an upper chamber and a lower chamber, and a fixed support for fixing a sampling head of a filter membrane sampling device is also arranged on the grid plate, characterized in that: A first air outlet is arranged on the side wall of the lower chamber, and the first air outlet is connected to a first filtering device and a first exhaust device; a second air outlet is arranged on the side wall of the upper chamber, and the second air outlet is fixedly connected to an air supply pipe, and the air supply pipe is connected to the air inlet end of the horizontal wind tunnel; an ejector of a jet pump is arranged in the air supply pipe, and the outlet of the ejector is connected to the horizontal wind tunnel, and the air suction port of the jet pump is connected to the air supply pipe; a second filtering device and a second exhaust device are connected downstream of the horizontal wind tunnel; a wind speed detector and a detection head installation window are arranged on the horizontal wind tunnel, and the detection head installation window is used to fix the sampling head of the standard detection instrument and the sampling head of the detection instrument to be calibrated.

2. A dynamic and static dual calibration device for a dust meter as claimed in claim 1, characterized in that: The air supply pipe includes a straight pipe section and a closed pipe section, the straight pipe section is fixed to the side wall of the upper chamber through a flange, the large diameter end of the closed pipe section is connected to the straight pipe section, the ejector of the jet pump is fixed in the straight pipe section, the bottom of the straight pipe section is provided with a compressed air inlet of the ejector, an external box is also fixed to the outside of the straight pipe section, and a working pump of the jet pump is fixed in the external box.

3. A dynamic and static dual calibration device for a dust meter as claimed in claim 2, characterized in that: The horizontal wind tunnel includes a flared pipe section and a horizontal uniform flow straight pipe section, the small diameter end of the flared pipe section is connected to the large diameter end of the closed pipe section, the large diameter end of the flared pipe section is connected to the horizontal uniform flow straight pipe section, and the detection head installation window and the wind speed detector are both arranged on the horizontal uniform flow straight pipe section.

4. A dynamic and static dual calibration device for a dust meter as claimed in claim 3, characterized in that: The detection head installation window is arranged at the upper part of the horizontal uniform flow straight pipe section, and an upper cover plate is detachably installed on the detection head installation window, and the sampling head of the fixed standard detection instrument and the sampling head of the detection instrument to be calibrated are fixed on the upper cover plate.

5. A dynamic and static dual calibration device for a dust meter as claimed in claim 4, characterized in that: A first sampling tube and a second sampling tube are fixed on the upper cover plate, the lower ends of the first sampling tube and the second sampling tube extend into the interior of the horizontal uniform flow straight pipe section, the lower end openings of the first sampling tube and the second sampling tube are horizontally arranged and face the air inlet side, and the upper ends of the first sampling tube and the second sampling tube are respectively connected to the sampling head of the standard testing instrument and the sampling head of the testing instrument to be calibrated.

6. A dynamic and static dual calibration device for a dust meter as claimed in claim 5, characterized in that: The lower end opening of the first sampling tube and the lower end opening of the second sampling tube are located on the same cross section, and the lower end opening of the first sampling tube and the lower end opening of the second sampling tube are close to the center of the horizontal uniform flow straight pipe section and are arranged symmetrically.

7. A dynamic and static dual calibration device for a dust meter as claimed in claim 6, characterized in that: The horizontal uniform flow straight pipe section is also provided with a temperature probe and a humidity probe, and the expanded pipe section is also provided with an air supply port for supplying warm and humid air, and the air supply port is connected to the warm and humid air supply system.

8. A dynamic and static dual calibration device for a dust meter as claimed in claim 1, characterized in that: The horizontal wind tunnel is fixed on a mobile bracket, and a universal wheel is arranged at the bottom of the mobile bracket.

9. A dynamic and static dual calibration device for a dust meter as claimed in claim 1, characterized in that: A pneumatic valve is arranged between the air supply pipe and the air inlet end of the horizontal wind tunnel.

10. A dynamic and static dual calibration device for a dust meter as claimed in claim 9, characterized in that: The first filter device and the second filter device are the same filter device, and the first air pumping device and the second air pumping device are the same power device.

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