Quantitative dust generator

Abstract

The present invention provides a quantitative dust generator, comprising: a mounting frame; a powder receiving plate, the powder receiving plate comprising a plate body horizontally rotatably arranged on the mounting frame, the plate body being provided with an annular powder feeding groove with the center line of the plate body as the center line; a powder supply container, the powder supply container comprising a container shell, the container shell being arranged above a part of the powder receiving plate, the container shell being provided with a powder discharge adjustment structure matched with the position of the annular powder feeding groove; a powder shielding cover, the powder shielding cover being located outside the powder supply container and being fixed to the powder supply container, the powder shielding cover being provided with an air blowing port and an air suction port, the powder shielding cover and a part of the annular powder feeding groove jointly defining a dust generating space that can be fed with powder on one side. The present invention can continuously and stably form an airflow with a constant dust concentration, thereby providing a dynamically stable dust-containing sample for calibrating dust detection equipment.

Description

Technical Field

[0001] The invention relates to the technical field of dust monitoring, in particular to a quantitative dust generator. Background Art

[0002] Continuous and stable low-concentration suspended dust airflow is the most practical standard sample for calibrating the sensitivity of dust monitoring equipment.

[0003] When dust is deposited together in a sedimentary form, it can be quantitatively transported by mechanical devices. However, when dust is put into a dust generator that can spray airflow, it adopts a free fall method of pushing powder, and cannot maintain a certain continuous and constant transport characteristic like water flow. Instead, it is put into the jet airflow drop by drop or in groups like water droplets. Therefore, in a jet airflow dust generator mixed with dust, the dust content concentration of the airflow is in an uncertain fluctuation during the differential time of passing a certain point.

[0004] In order to solve this problem, the industry has adopted the method of increasing the integration time, reducing the fluctuation value of the dust content, and obtaining the average value of the dust content per unit time. However, this approach cannot solve the response value required for real-time sampling of dust monitoring equipment.

[0005] like Figure 1 As shown, the existing in-situ dust generator includes a powder outlet pipe 01 and a powder receiving hopper 02. In the actual dust generation process, the dust pushed out from the powder outlet pipe 01 falls into the powder receiving hopper 02 in the form of drops or clumps, and is then blown away by the airflow ejected from the jet pipe 03. The concentration of the dust airflow formed in this way is uneven. Summary of the invention

[0006] In view of the above-mentioned shortcomings of the prior art, the technical problem to be solved by the present invention is to provide a quantitative dust generator that can continuously and stably form an airflow with a constant dust concentration, thereby providing a dynamically stable dust sample for calibrating dust detection equipment.

[0007] In order to solve the above technical problems, the present invention provides a quantitative dust generator, comprising:

[0008] Mounting frame;

[0009] The powder receiving plate comprises a plate body which is horizontally rotatably arranged on a mounting frame, and the plate body is provided with an annular powder feeding groove with the center line of the plate body as the center line;

[0010] The powder supply container comprises a container shell, which is mounted above a portion of the powder receiving plate, and a powder discharge adjustment structure is provided on the container shell to match the position of the annular powder feeding groove;

[0011] The powder shield is located outside the powder supply container and is fixed to the powder supply container. An air blowing port and an air suction port are provided on the powder shield. The powder shield and part of the annular powder feeding groove jointly define a dust generating space that can feed powder from one side.

[0012] Preferably, the powder blocking cover comprises a flow blocking plate and a powder blocking plate which are vertically connected, the flow blocking plate blocks the opening of the annular powder feeding groove, and the powder blocking plate blocks the powder feeding path of the annular powder feeding groove.

[0013] Preferably, the baffle plate is connected to the container shell via a connecting rod.

[0014] Preferably, the powder discharge adjustment structure includes a powder guide plate and a powder discharge gate, the powder guide plate is tiltedly arranged in the container shell to guide the powder to the annular powder feeding groove, and the powder discharge gate is slidably arranged on the container shell and intercepts the powder feeding path of the annular powder feeding groove.

[0015] Preferably, the quantitative dust generator also includes a three-way pipe and a venturi device, the three-way pipe has an air supply port, a first air outlet and a second air outlet, the venturi device has an air inlet, a negative pressure port and an exhaust port, the first air outlet is connected to the air blowing port through an air blowing pipe, the second air outlet is connected to the air inlet, and the negative pressure port is connected to the air suction port through an air suction pipe.

[0016] Preferably, an air flow filter is provided on the air supply port of the three-way pipe.

[0017] Preferably, the air blowing pipe is provided with an air blowing flow meter and an air blowing regulating valve, and the air suction pipe is provided with an air suction flow meter.

[0018] Preferably, the quantitative dust generator also includes a driving device, which includes a speed regulating motor, a transmission assembly and a driven wheel. The speed regulating motor is arranged on the mounting frame, and the driven wheel is coaxially connected to the powder receiving plate and is connected to the speed regulating motor through the transmission assembly.

[0019] Preferably, the groove wall of the annular powder feeding groove is composed of an inner straight side wall, an arc-shaped groove bottom and an outer straight side wall, and the blowing port and the air suction port are arranged on both sides of the annular powder feeding groove along the radial direction of the disk body.

[0020] Preferably, the transition point between the arc-shaped groove bottom and the inner straight side wall is vertically aligned with the blowing port, and the transition point between the arc-shaped groove bottom and the outer straight side wall is vertically aligned with the suction port.

[0021] As described above, the quantitative dust generator of the present invention has the following beneficial effects: the quantitative dust generator of the present invention changes the existing powder pushing and dropping method into an airflow blowing and suction method: the powder shield is located outside the powder supply container and remains fixed to the powder supply container, and the powder shield and part of the annular powder feeding groove jointly define a dust generating space that can be fed with powder on one side. With such an arrangement, when air is blown into the dust generating space at a uniform speed through the blowing port and the airflow in the dust generating space is extracted through the suction port, a stable airflow can be formed in the dust generating space. When the annular powder feeding groove of the powder receiving plate feeds the powder supplied by the powder supply container into the dust generating space at a uniform speed, the powder is immediately carried away by the airflow, so that the dust concentration of the airflow flowing out of the suction port remains consistent. Therefore, the quantitative dust generator of the present invention can continuously and stably form an airflow with a constant dust concentration, thereby providing a dynamically stable dust-containing sample for calibrating dust detection equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Shown is a schematic diagram of an in-situ dust generator in the prior art;

[0023] Figure 2 Shown is a three-dimensional view of the quantitative dust generator of the present invention;

[0024] Figure 3 Shown is a front view of the quantitative dust generator of the present invention;

[0025] Figure 4 Shown is a top view of the quantitative dust generator of the present invention;

[0026] Figure 5 Shown is a cross-sectional view of the quantitative dust generator of the present invention;

[0027] Figure 6 Display as Figure 5 A magnified view of part A;

[0028] Figure 7 Shown is a perspective view of the powder shield.

[0029] Component number description

[0030] 01 Powder discharge pipe

[0031] 02 Powder receiving hopper

[0032] 03 Jet tube

[0033] 1 Mounting bracket

[0034] 2 Powder receiving tray

[0035] 21 Plate

[0036] 22 Annular powder feeding trough

[0037] 221 inner straight sidewall

[0038] 222 Arc groove bottom

[0039] 223 Outer straight sidewall

[0040] 3 Powder supply container

[0041] 31 Container shell

[0042] 32 Powder discharge adjustment structure

[0043] 321 Powder guide plate

[0044] 322 Powder discharge gate

[0045] 4 Powder shield

[0046] 41 Blowing port

[0047] 42 Inlet

[0048] 43 spoiler

[0049] 44 Powder blocking board

[0050] 45 Connecting rod

[0051] 5 Tee pipe

[0052] 51 Air supply port

[0053] 52 First air outlet

[0054] 53 Second air outlet

[0055] 54 Blowpipe

[0056] 541 Air blowing regulating valve

[0057] 6 Venturi device

[0058] 61 Air Inlet

[0059] 62 Negative pressure port

[0060] 63 Exhaust port

[0061] 64 Intake pipe

[0062] 7 Airflow filter

[0063] 8 Drive device

[0064] 81 Speed ​​regulating motor

[0065] 82 Transmission components

[0066] 83 driven wheel

[0067] 9 Airflow DETAILED DESCRIPTION

[0068] The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0069] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size, without affecting the effects and purposes that can be achieved by the present invention, should still fall within the scope of the technical content disclosed by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0070] Figure 4 In the figure, direction B is the powder feeding direction of the annular powder feeding groove 22; Figure 5 In the figure, the C direction is the sliding direction of the powder; Figure 6 In the figure, direction D is the flow direction of the airflow 9.

[0071] like Figures 2 to 6 As shown, the present invention provides a quantitative dust generator, comprising:

[0072] Mounting frame 1;

[0073] The powder receiving plate 2 comprises a plate body 21 which is horizontally rotatably arranged on the mounting frame 1, and an annular powder feeding groove 22 with the center line of the plate body 21 as the center line is arranged on the plate body 21;

[0074] The powder supply container 3 includes a container shell 31, which is mounted above a portion of the powder receiving plate 2. The container shell 31 is provided with a powder discharge adjustment structure 32 that matches the position of the annular powder feeding groove 22;

[0075] The powder shield 4 is located outside the powder supply container 3 and is fixed to the powder supply container 3. The powder shield 4 is provided with an air blowing port 41 and an air suction port 42. The powder shield 4 and a part of the annular powder feeding groove 22 jointly define a dust generating space that can be fed with powder on one side.

[0076] The quantitative dust generator of the present invention changes the existing powder pushing and dropping method into an airflow blowing and suction method: the powder shield 4 is located outside the powder supply container 3 and is fixed to the powder supply container 3, and the powder shield 4 and the partial annular powder feeding groove 22 jointly define a dust generating space that can be fed with powder on one side. With such a configuration, when air is blown into the dust generating space at a uniform speed through the air blowing port 41 and the air flow in the dust generating space is extracted through the air suction port 42, as long as the flow rate at the air blowing port 41 is equal to the flow rate at the air suction port 42, a stable airflow 9 (the airflow 9 can be an air curtain) can be formed in the dust generating space, and the airflow 9 will not flow out from the powder feeding place of the dust generating space. When the annular powder feeding groove 22 of the powder receiving plate 2 feeds the powder (dust raw material) supplied by the powder supply container 3 into the dust generating space at a uniform speed, the powder is immediately taken away by the airflow 9, so that the dust concentration of the airflow 9 flowing out of the air suction port 42 is always kept consistent. It is worth noting that the continuous and stable powder delivery speed of the powder receiving plate 2 and the accumulation height of the powder in the annular powder delivery groove 22 are the key factors to ensure that the airflow 9 takes away a constant amount of powder within the differential time. The calculation method of the powder delivery amount of the annular powder delivery groove 22 is: the preset constant speed powder delivery amount (mg / s) = powder cross-sectional area (mm 2 )·Speed ​​of the center line of the annular powder feeding trough (mm / s)·Specific gravity of powder (mg / mm 3 ).

[0077] Therefore, the quantitative dust generator of the present invention can continuously and stably form an airflow 9 with a constant dust concentration, thereby providing a dynamically stable dust-containing sample for calibrating a dust detection device.

[0078] like Figure 7 As shown, in order to simplify the structure of the powder shielding cover 4, the powder shielding cover 4 includes a flow shielding plate 43 and a powder shielding plate 44 which are vertically connected. The flow shielding plate 43 shields the opening of the annular powder feeding groove 22, and the powder shielding plate 44 shields the powder feeding path of the annular powder feeding groove 22. Furthermore, the flow shielding plate 43 can be slidably matched with the top surface of the disk body 21, and the powder shielding plate 44 can also be slidably matched with the groove wall of the annular powder feeding groove 22. In order to further prevent the powder in the annular powder feeding groove 22 from remaining in the annular powder feeding groove 22 after passing through the dust generating space, the panel shape of the powder shielding plate 44 is adapted to the cross-sectional shape of the annular powder feeding groove 22.

[0079] In order to keep the powder shield 4 and the powder supply container 3 fixed, the baffle plate 43 is connected to the container shell 31 via a connecting rod 45. In addition, as another embodiment of the powder shield 4: the powder shield 4 is fixedly connected to the mounting frame 1 via a connecting piece.

[0080] like Figure 5As shown, in order to uniformly convey powder to the above-mentioned dust-generating space, the above-mentioned powder discharge adjustment structure 32 includes a powder guide plate 321 and a powder discharge gate 322. The powder guide plate 321 is tiltedly arranged in the container shell 31 to guide the powder to the annular powder feeding groove 22. The powder discharge gate 322 is slidably arranged on the container shell 31 and intercepted on the powder feeding path of the annular powder feeding groove 22. When in use, the powder for dust generation is poured into the container shell 31. Under the action of gravity, the powder is concentrated and accumulated in the annular powder feeding groove 22 located below the container shell 31 along the powder guide plate 321. The powder discharge gate 322 can adjust the thickness of the powder delivered to the dust-generating space. The higher the powder discharge gate 322 is opened upward, the thicker the thickness of the powder delivered to the dust-generating space. After the annular powder feeding groove 22 delivers the powder with a preset thickness into the dust-generating space, the powder is completely sucked away with the airflow 9.

[0081] like Figure 3 , Figure 5 as well as Figure 6 As shown, in order to improve the integration of the above-mentioned quantitative dust generator, the quantitative dust generator also includes a three-way pipe 5 and a venturi device 6, the three-way pipe 5 has an air supply port 51, a first air outlet 52 and a second air outlet 53, the venturi device 6 has an air inlet 61, a negative pressure port 62 and an exhaust port 63, the first air outlet 52 is connected to the air blowing port 41 through the air blowing pipe 54, the second air outlet 53 is connected to the air inlet 61, and the negative pressure port 62 is connected to the air suction port 42 through the air suction pipe 64. When in use, a jet (the jet can be formed by compressed air) flows into the three-way pipe 5 through the air supply port 51, and the three-way pipe 5 divides the jet into a first branch and a second branch, wherein the first branch flows into the dust generating space through the blowing pipe 54 and forms an airflow 9 with a uniform dust concentration with the powder, and the second branch flows into the Venturi device 6 to form a negative pressure in the suction pipe 64 (Venturi effect), so that the airflow 9 with a uniform dust concentration can flow into the Venturi device 6 through the suction pipe 64, and finally the airflow 9 with a uniform dust concentration and the second branch flow converge with each other and flow out through the exhaust port 63 of the Venturi device 6.

[0082] In order to remove impurities in the jet, an air flow filter 7 is provided on the air supply port 51 of the three-way pipe 5. The air flow filter 7 may be an oil-water separator.

[0083] like Figure 3 As shown, in order to make the flow rate in the blowing pipe 54 consistent with the flow rate in the suction pipe 64, the blowing pipe 54 is provided with a blowing flow meter and a blowing regulating valve 541, and the suction pipe 64 is provided with a suction flow meter.

[0084] like Figure 5As shown, in order to achieve uniform rotation of the powder receiving plate 2, the quantitative dust generator also includes a driving device 8, which includes a speed regulating motor 81, a transmission assembly 82 and a driven wheel 83. The speed regulating motor 81 is arranged on the mounting frame 1, and the driven wheel 83 is coaxially connected to the powder receiving plate 2 and is connected to the speed regulating motor 81 through the transmission assembly 82.

[0085] In order to simplify the structure of the mounting frame 1 , the mounting frame 1 is a box-type frame structure, and the powder receiving tray 2 is arranged on the top of the mounting frame 1 .

[0086] like Figure 6 As shown, in order to form a stable airflow 9 in the dust generating space, the groove wall of the annular powder feeding groove 22 is composed of an inner straight side wall 221, an arc-shaped groove bottom 222 and an outer straight side wall 223, and the blowing port 41 and the air inlet 42 are arranged on both sides of the annular powder feeding groove 22 along the radial direction of the disc body 21. Furthermore, in order to further improve the stability of the airflow 9, the transition connection between the arc-shaped groove bottom 222 and the inner straight side wall 221 is aligned with the blowing port 41, and the transition connection between the arc-shaped groove bottom 222 and the outer straight side wall 223 is aligned with the air inlet 42.

[0087] In summary, the quantitative dust generator of the present invention can continuously and stably form an airflow with a constant dust concentration, thereby providing a dynamically stable dust sample for calibrating dust detection equipment. Therefore, the present invention effectively overcomes various shortcomings of the prior art and has a high industrial utilization value.

[0088] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A quantitative dust generator, It is characterized in that include: Mounting frame (1); A powder receiving plate (2), the powder receiving plate (2) comprising a plate body (21) horizontally rotatably arranged on a mounting frame (1), the plate body (21) being provided with an annular powder feeding groove (22) with a center line of the plate body (21) as a circle center line; A powder supply container (3), the powder supply container (3) comprising a container shell (31), the container shell (31) being mounted above a portion of the powder receiving plate (2), and the container shell (31) being provided with a powder discharge adjustment structure (32) that matches the position of the annular powder feeding groove (22); A powder shield (4), the powder shield (4) is located outside the powder supply container (3) and is fixed to the powder supply container (3), the powder shield (4) is provided with an air blowing port (41) and an air suction port (42), and the powder shield (4) and a part of the annular powder feeding groove (22) jointly define a dust generating space that can be fed with powder on one side; The powder shield (4) comprises a flow shielding plate (43) and a powder shielding plate (44) which are vertically connected, the flow shielding plate (43) shields the opening of the annular powder feeding groove (22), and the powder shielding plate (44) shields the powder feeding path of the annular powder feeding groove (22); The groove wall of the annular powder feeding groove (22) is composed of an inner straight side wall (221), an arc-shaped groove bottom (222) and an outer straight side wall (223); the blowing port (41) and the air suction port (42) are arranged on both sides of the annular powder feeding groove (22) along the radial direction of the disc body (21).

2. The quantitative dust generator according to claim 1, Features: The baffle plate (43) is connected to the container shell (31) via a connecting rod (45).

3. The quantitative dust generator according to claim 1, Features: The powder discharge adjustment structure (32) comprises a powder guide plate (321) and a powder discharge gate (322), wherein the powder guide plate (321) is arranged obliquely in the container shell (31) to guide the powder to the annular powder feeding groove (22), and the powder discharge gate (322) is arranged on the container shell (31) to slide up and down and intercept the powder feeding path of the annular powder feeding groove (22).

4. The quantitative dust generator according to claim 1, Features: The quantitative dust generator also includes a three-way pipe (5) and a venturi device (6); the three-way pipe (5) has an air supply port (51), a first air outlet (52) and a second air outlet (53); the venturi device (6) has an air inlet (61), a negative pressure port (62) and an air outlet (63); the first air outlet (52) is connected to the air inlet (41) via an air blowing pipe (54); the second air outlet (53) is connected to the air inlet (61); and the negative pressure port (62) is connected to the air inlet (42) via an air suction pipe (64).

5. The quantitative dust generator according to claim 4, Features: An air flow filter (7) is provided on the air supply port (51) of the three-way pipe (5).

6. The quantitative dust generator according to claim 4, Features: The air blowing pipe (54) is provided with an air blowing flow meter and an air blowing regulating valve (541), and the air suction pipe (64) is provided with an air suction flow meter.

7. The quantitative dust generator according to claim 1, Features: The quantitative dust generator further comprises a driving device (8), the driving device (8) comprising a speed regulating motor (81), a transmission assembly (82) and a driven wheel (83), the speed regulating motor (81) being arranged on the mounting frame (1), the driven wheel (83) being coaxially connected to the powder receiving plate (2) and being connected to the speed regulating motor (81) via the transmission assembly (82).

8. The quantitative dust generator according to claim 1, Features: The transition point between the arc-shaped groove bottom (222) and the inner straight side wall (221) is aligned with the blowing port (41) in the vertical direction, and the transition point between the arc-shaped groove bottom (222) and the outer straight side wall (223) is aligned with the suction port (42) in the vertical direction.

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