CN212321382U

CN212321382U - Quantitative dust generator

Info

Publication number: CN212321382U
Application number: CN202022086467.6U
Authority: CN
Inventors: 李熠豪; 王占锋
Original assignee: Shanghai Baif Technology Co ltd
Current assignee: Shanghai Baif Technology Co ltd
Priority date: 2020-09-21
Filing date: 2020-09-21
Publication date: 2021-01-08
Anticipated expiration: 2030-09-21

Abstract

The utility model provides a dust ware is sent out to ration formula dust, include: a mounting frame; the powder receiving disc comprises a disc body horizontally and rotatably arranged on the mounting frame, and an annular powder conveying groove taking the central line of the disc body as a circular center line is formed in the disc body; the powder supply container comprises a container shell, the container shell is erected above part of the powder receiving plate, and the container shell is provided with a powder discharging adjusting structure matched with the annular powder feeding groove in position; and the powder blocking cover is positioned outside the powder supply container and is fixedly kept with the powder supply container, an air blowing opening and an air suction opening are formed in the powder blocking cover, and the powder blocking cover and the part of the annular powder feeding groove jointly define a dust sending space capable of feeding powder on one side. The utility model discloses can continuously form the air current that dust concentration keeps unchangeable steadily to provide the dust-laden sample of dynamic stability for calibration dust check out test set.

Description

Quantitative dust generator

Technical Field

The utility model relates to a dust monitoring technology field especially relates to a dust ware is sent out to ration formula dust.

Background

The continuous and stable low-concentration suspended dust airflow is a standard sample which is most suitable for practical application and used for calibrating the sensitivity of dust monitoring equipment.

The dust, when deposited together in a deposited form, can be transported quantitatively by mechanical means. However, when the dust is put into a dust generating device capable of spraying air current, the dust is pushed to fall freely, so that the certain continuous constant conveying characteristic cannot be maintained like water current, and the dust is put into the spraying air current like water drops, one drop or one lump. In the case of a dust-laden air-jet dust generator, the dust content concentration of the air stream is therefore subject to an uncertain fluctuation in the differential time through a certain point.

In order to solve this problem, it is proposed to increase the integration time and reduce the fluctuation of the dust content to obtain an average value of the dust content per unit time. However, this approach does not address the response values required for real-time sampling by the dust monitoring device.

As shown in fig. 1, the existing in-situ dust generator includes a powder outlet pipe 01 and a powder receiving hopper 02, and during the actual dust generation process, the dust pushed out from the powder outlet pipe 01 drops to the powder receiving hopper 02 in the form of a drop or lump, and is then blown away by the airflow jetted from the jet pipe 03, so that the concentration of the airflow of the dust is not uniform.

SUMMERY OF THE UTILITY MODEL

In view of the above shortcomings of the prior art, the to-be-solved technical problem of the present invention is to provide a quantitative dust generator, which can continuously and stably form an air flow with a dust concentration kept unchanged, thereby providing a dynamically stable dust-containing sample for calibrating a dust detection device.

In order to solve the technical problem, the utility model provides a dust ware is sent out to ration formula dust, include:

a mounting frame;

the powder receiving disc comprises a disc body horizontally and rotatably arranged on the mounting frame, and an annular powder conveying groove taking the central line of the disc body as a circular center line is formed in the disc body;

the powder supply container comprises a container shell, the container shell is erected above part of the powder receiving plate, and the container shell is provided with a powder discharging adjusting structure matched with the annular powder feeding groove in position;

and the powder blocking cover is positioned outside the powder supply container and is fixedly kept with the powder supply container, an air blowing opening and an air suction opening are formed in the powder blocking cover, and the powder blocking cover and the part of the annular powder feeding groove jointly define a dust sending space capable of feeding powder on one side.

Preferably, the powder blocking cover comprises a flow blocking plate and a powder blocking plate which are vertically connected, the flow blocking plate covers and seals the opening of the annular powder feeding groove, and the powder blocking plate covers a powder feeding path of the annular powder feeding groove.

Preferably, the baffle plate is connected to the container housing by a connecting rod.

Preferably, the powder discharging adjusting structure comprises a powder guide plate and a powder discharge gate, the powder guide plate is obliquely arranged in the container shell to guide the powder to the annular powder feeding groove, and the powder discharge gate is arranged on the container shell in an up-down sliding manner and is intercepted on a powder feeding path of the annular powder feeding groove.

Preferably, the quantitative dust generator further comprises a three-way pipe and a venturi device, the three-way pipe is provided with an air supply port, a first air outlet and a second air outlet, the venturi device is provided with an air inlet, a negative pressure port and an air exhaust port, the first air outlet is communicated with the air blowing port through an air blowing pipe, the second air outlet is communicated with the air inlet, and the negative pressure port is communicated with the air suction port through an air suction pipe.

Preferably, an air flow filter is arranged on an air supply port of the three-way pipe.

Preferably, the air blowing pipe is provided with an air blowing flow meter and an air blowing adjusting valve, and the air suction pipe is provided with an air suction flow meter.

Preferably, the quantitative dust generator further comprises a driving device, the driving device comprises 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 with the powder receiving disc and is connected with the speed regulating motor through the transmission assembly.

Preferably, the groove wall of the annular powder feeding groove is composed of an inner straight side wall, an arc groove bottom and an outer straight side wall, and the air blowing port and the air suction port are arranged on two sides of the annular powder feeding groove along the radial direction of the disc body.

Preferably, the transition joint of the arc-shaped groove bottom and the inner straight side wall is vertically aligned with the air blowing port, and the transition joint of the arc-shaped groove bottom and the outer straight side wall is vertically aligned with the air suction port.

As mentioned above, the utility model discloses a quantitative formula dust generator has following beneficial effect: the utility model discloses a quantitative formula dust generator will have now to push away the powder mode of falling and change into the air current and blow the mode of inhaling: keep off the powder cover and lie in outside supplying the powder container and with supply the powder container and keep fixed, keep off the powder cover and send the powder groove with part annular and delimit the dust sending space that can unilateral advance powder jointly, so set up, when at the uniform velocity blow in going to the dust sending space through the gas blowing mouth and will send the air current in the dust sending space to take out through the induction port, can form a stable air current in the dust sending space. When the annular powder feeding groove of the powder receiving disc sends the powder supplied by the powder supply container into the dust sending space at a constant speed, the powder is immediately taken away by the airflow, so that the dust concentration of the airflow flowing out of the air suction port is always kept consistent. Therefore, the utility model discloses a quantitative formula dust generator can continuously and stably form the air current that dust concentration keeps unchangeable to provide the dirt sample of dynamic stability for calibration dust check out test set.

Drawings

FIG. 1 is a schematic view of a prior art in-situ dust generator;

FIG. 2 is a perspective view of the quantitative dust generator of the present invention;

FIG. 3 is a front view of the constant-volume dust generator of the present invention;

FIG. 4 is a top view of the dust generator of the present invention;

FIG. 5 is a cross-sectional view of the dust generator of the present invention;

FIG. 6 is an enlarged view of portion A of FIG. 5;

fig. 7 is a perspective view of the powder blocking cover.

Description of the element reference numerals

01 powder outlet pipe

02 powder receiving hopper

03 jet pipe

1 mounting rack

2 powder receiving plate

21 dish body

22 annular powder feeding groove

221 inner straight side wall

222 arc groove bottom

223 outer straight side wall

3 powder supply container

31 container shell

32 go out powder and adjust structure

321 powder guide plate

322 powder discharge gate

4 keep off powder cover

41 air blowing port

42 air inlet

43 baffle plate

44 powder blocking plate

45 connecting rod

5 three-way pipe

51 air supply port

52 first air outlet

53 second air outlet

54 air blowing pipe

541 blowing regulating valve

6 Venturi device

61 air inlet

62 negative pressure port

63 exhaust port

64 air suction pipe

7 airflow filter

8 drive device

81 speed regulating motor

82 drive assembly

83 driven wheel

9 air flow

Detailed Description

The following description is provided for illustrative purposes, and other advantages and features of the present invention will become apparent to those skilled in the art from the following detailed description.

It should be understood that the structures, ratios, sizes, etc. shown in the drawings of the present specification are only used for matching with the contents disclosed in the specification, so as to be known and read by those skilled in the art, and are not used for limiting the limit conditions that the present invention can be implemented, so that the present invention has no technical essential meaning, and any modification of the structures, changes of the ratio relationship, or adjustment of the sizes should still fall within the scope covered by the technical contents disclosed in the present invention without affecting the efficacy and the achievable purpose of the present invention. Meanwhile, the terms such as "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for convenience of description, and are not intended to limit the scope of the present invention, and changes or adjustments of the relative relationship thereof may be made without substantial technical changes, and the present invention is also regarded as the scope of the present invention.

In fig. 4, the direction B is the powder feeding direction of the annular powder feeding groove 22; in FIG. 5, the direction C is the falling direction of the powder; in fig. 6, the direction D is the flow direction of the air flow 9.

As shown in fig. 2 to 6, the utility model provides a quantitative dust generator, which comprises:

a mounting frame 1;

the powder receiving plate 2 comprises a plate body 21 which is horizontally and rotatably arranged on the mounting frame 1, and an annular powder conveying groove 22 which takes the central line of the plate body 21 as the circular center line is arranged on the plate body 21;

the powder supply container 3, the powder supply container 3 includes the container body 31, the container body 31 is erected above some powder receiving discs 2, there are powder outlet regulating structures 32 cooperating with position of the annular powder feeding trough 22 on the container body 31;

and the powder blocking cover 4 is positioned outside the powder supply container 3 and is fixedly kept with the powder supply container 3, the powder blocking cover 4 is provided with an air blowing opening 41 and an air suction opening 42, and the powder blocking cover 4 and the partial annular powder feeding groove 22 jointly define a dust generating space capable of feeding powder on one side.

The utility model discloses a quantitative formula dust generator will have now to push away the powder mode of falling and change into the air current and blow the mode of inhaling: keep off the powder cover 4 and lie in supplying outside the powder container 3 and with supply powder container 3 and keep fixed, keep off powder cover 4 and partial annular send powder groove 22 to delimit the dust-generating space that can unilateral enter powder jointly, so set up, when blowing at the uniform velocity in the dust-generating space through blowing port 41 and will send the air current in the dust-generating space to take out through induction port 42, as long as the velocity of flow of blowing port 41 department is equal with the velocity of flow of induction port 42 department, just can form a stable air current 9 (air current 9 can be the air curtain) in sending the dust-generating space, air current 9 can not flow out from the dust-generating space's place of advancing. When the annular powder feeding groove 22 of the powder receiving plate 2 feeds the powder (dust material) supplied from the powder supply container 3 into the dust emitting space at a constant speed, the powder is immediately taken away by the air flow 9, so that the dust concentration of the air flow 9 flowing out from the air inlet 42 is always kept consistent. It is worth noting that: the continuous and stable powder feeding speed of the powder receiving plate 2 and the accumulation height of the powder in the annular powder feeding groove 22 are key factors for ensuring that the airflow 9 carries away a constant amount of powder in a differential time. The calculation method of the powder feeding amount of the annular powder feeding groove 22 is as follows: the preset constant-speed powder conveying amount (mg/s) is equal to the powder sectional area (mm)²) Rotation speed (mm/s) of central line of annular powder conveying groove and powder specific weight (mg/mm)³)。

Therefore, the utility model discloses a quantitative formula dust generator can continuously and stably form dust concentration and keep unchangeable air current 9 to provide the dusty sample of dynamic stability for calibration dust check out test set.

As shown in fig. 7, in order to simplify the structure of the powder blocking cover 4, the powder blocking cover 4 includes a flow blocking plate 43 and a powder blocking plate 44 which are vertically connected, the flow blocking plate 43 covers the opening of the annular powder feeding groove 22, and the powder blocking plate 44 covers the powder feeding path of the annular powder feeding groove 22. Furthermore, the baffle plate 43 can be slidably fitted with the top surface of the tray body 21, and the powder baffle plate 44 can also be slidably fitted with the wall of the annular powder feeding groove 22. In order to further prevent 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 baffle 44 is adapted to the cross-sectional shape of the annular powder feeding groove 22.

In order to fix the powder blocking cover 4 to the powder supply container 3, the baffle plate 43 is connected to the container housing 31 by a connecting rod 45. In addition, as another embodiment of the powder blocking cover 4: the powder blocking cover 4 is fixedly connected with the mounting frame 1 through a connecting piece.

As shown in fig. 5, in order to uniformly deliver the powder to the dust generating space, the powder discharge adjusting structure 32 includes a powder guide plate 321 and a powder discharge gate 322, the powder guide plate 321 is obliquely disposed in the container housing 31 to guide the powder to the annular powder feeding groove 22, and the powder discharge gate 322 is slidably disposed on the container housing 31 up and down and is intercepted on the powder feeding path of the annular powder feeding groove 22. When the dust-generating gate is used, powder for dust generation is poured into the container shell 31, the powder is intensively accumulated in the annular powder conveying groove 22 below the container shell 31 along the powder guide plate 321 under the action of gravity, and the thickness of the powder conveyed to the dust-generating space can be adjusted by the powder discharge gate 322. The higher the powder discharge gate 322 is opened upward, the thicker the thickness of the powder transported to the dust generating space. After the annular dust chute 22 has fed the dust of a predetermined thickness into the dust-emitting space, the dust is sucked away in its entirety with the gas flow 9.

As shown in fig. 3, 5 and 6, in order to improve the integration of the quantitative dust generator, the quantitative dust generator further 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 communicated with the air blowing port 41 through an air blowing pipe 54, the second air outlet 53 is communicated with the air inlet 61, and the negative pressure port 62 is communicated with the air suction port 42 through an air suction pipe 64. In use, a jet (which may be formed by compressed air) flows into the tee 5 through the air supply port 51, the tee 5 divides the jet into a first partial flow and a second partial flow, wherein the first partial flow flows into the dust generating space through the blowing pipe 54 and forms an air flow 9 with a uniform dust concentration with the powder, the second partial flow flows into the venturi device 6 to form a negative pressure (venturi effect) in the air suction pipe 64, so that the air flow 9 with a uniform dust concentration flows into the venturi device 6 through the air suction pipe 64, and finally the air flow 9 with a uniform dust concentration and the second partial flow converge with each other and flow out through the air discharge port 63 of the venturi device 6.

An air flow filter 7 is provided at the air supply port 51 of the tee pipe 5 to remove impurities in the jet flow. The air flow filter 7 may be an oil-water separator.

As shown in fig. 3, in order to make the flow rate in the blowpipe 54 and the flow rate in the suction pipe 64 uniform, a blowflow meter and a blowflow control valve 541 are provided in the blowpipe 54, and a suction flow meter is provided in the suction pipe 64.

As shown in fig. 5, in order to realize the uniform rotation of the powder receiving plate 2, the quantitative dust generator further includes a driving device 8, the driving device 8 includes a speed regulating motor 81, a transmission assembly 82 and a driven wheel 83, the speed regulating motor 81 is disposed on the mounting frame 1, and the driven wheel 83 is coaxially connected with the powder receiving plate 2 and is connected with the speed regulating motor 81 through the transmission assembly 82.

In order to simplify the structure of the mounting bracket 1, the mounting bracket 1 has a box-type frame structure, and the powder receiving plate 2 is arranged on the top of the mounting bracket 1.

As shown in fig. 6, in order to form a stable air flow 9 in the dust generating space, the wall of the annular powder feeding groove 22 is formed by an inner straight side wall 221, an arc groove bottom 222 and an outer straight side wall 223, and the air blowing port 41 and the air suction port 42 are arranged on both sides of the annular powder feeding groove 22 in the radial direction of the disk body 21. Further, in order to further improve the stability of the air flow 9, the transition junction of the arc-shaped groove bottom 222 and the inner straight sidewall 221 is aligned with the air blowing opening 41 up and down, and the transition junction of the arc-shaped groove bottom 222 and the outer straight sidewall 223 is aligned with the air suction opening 42 up and down.

To sum up, the utility model discloses a quantitative formula dust sends out dirt ware can continuously form the air current that dust concentration keeps unchangeable steadily to provide the dirt sample of dynamic stability for calibration dust check out test set. Therefore, the utility model effectively overcomes various defects in the prior art and has high industrial utilization value.

The above embodiments are merely illustrative of the principles and effects of the present invention, and are not to be construed as limiting the invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

Claims

1. A quantitative dust precipitator, comprising:

a mounting frame (1);

the powder receiving disc (2) comprises a disc body (21) which is horizontally and rotatably arranged on the mounting frame (1), and an annular powder conveying groove (22) which takes the central line of the disc body (21) as a circular center line is arranged on the disc body (21);

the powder supply container (3), the powder supply container (3) includes the container body (31), the container body (31) is set up and connected above the powder pan (2) partially, there are powder outlet regulating structures (32) cooperating with annular powder feeding trough (22) position on the container body (31);

the powder blocking cover (4) is positioned outside the powder supply container (3) and is fixedly kept with the powder supply container (3), an air blowing opening (41) and an air suction opening (42) are formed in the powder blocking cover (4), and the powder blocking cover (4) and the partial annular powder feeding groove (22) jointly define a dust sending space capable of allowing powder to enter from one side.

2. A quantitative dust precipitator according to claim 1, wherein: the powder blocking cover (4) comprises a flow blocking plate (43) and a powder blocking plate (44) which are vertically connected, the flow blocking plate (43) is covered at the opening of the annular powder feeding groove (22), and the powder blocking plate (44) is covered on a powder feeding path of the annular powder feeding groove (22).

3. A dust hopper according to claim 2, wherein: the flow shielding plate (43) is connected with the container shell (31) through a connecting rod (45).

4. A quantitative dust precipitator according to claim 1, wherein: the powder discharging adjusting structure (32) comprises a powder guide plate (321) and a powder discharge gate (322), the powder guide plate (321) is obliquely arranged in the container shell (31) to guide powder to the annular powder feeding groove (22), and the powder discharge gate (322) is arranged on the container shell (31) in a vertically sliding mode and is intercepted on a powder feeding path of the annular powder feeding groove (22).

5. A quantitative dust precipitator according to claim 1, wherein: the quantitative dust generator further comprises a three-way pipe (5) and a Venturi device (6), the three-way pipe (5) is provided with an air supply port (51), a first air outlet (52) and a second air outlet (53), the Venturi device (6) is provided with an air inlet (61), a negative pressure port (62) and an air exhaust port (63), the first air outlet (52) is communicated with an air blowing port (41) through an air blowing pipe (54), the second air outlet (53) is communicated with the air inlet (61), and the negative pressure port (62) is communicated with an air suction port (42) through an air suction pipe (64).

6. A quantitative dust precipitator according to claim 5, wherein: and an air flow filter (7) is arranged on an air supply port (51) of the three-way pipe (5).

7. A quantitative dust precipitator according to claim 5, wherein: the air blowing pipe (54) is provided with an air blowing flow meter and an air blowing adjusting valve (541), and the air suction pipe (64) is provided with an air suction flow meter.

8. A quantitative dust precipitator according to claim 1, wherein: the quantitative dust generator further comprises a driving device (8), the driving device (8) comprises 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 with the powder receiving disc (2) and is connected with the speed regulating motor (81) through the transmission assembly (82).

9. A quantitative dust precipitator according to claim 1, wherein: the wall of the annular powder feeding groove (22) is composed of an inner straight side wall (221), an arc groove bottom (222) and an outer straight side wall (223), and the air blowing opening (41) and the air suction opening (42) are radially arranged on two sides of the annular powder feeding groove (22) along the disc body (21).

10. A dust and dust dispenser according to claim 9, wherein: the transition joint of the arc-shaped groove bottom (222) and the inner straight side wall (221) is vertically aligned with the air blowing port (41), and the transition joint of the arc-shaped groove bottom (222) and the outer straight side wall (223) is vertically aligned with the air suction port (42).