A dust generating device

Abstract

The present application relates to a kind of experimental equipment simulating dust environment, specifically to a kind of dust generating device, solve the problems such as poor dust release persistence and stability of existing dust generating device.The present application includes feeding device and spraying material device, feeding device includes storage barrel, scraper, motor, a week groove is arranged in the bottom of storage barrel, motor is connected with the bottom plate of storage barrel, so that storage barrel or storage barrel bottom plate rotates with the operation of motor, scraper is provided with high-pressure air pipe, air supplement pipe, feeding pipe, the outlet of three pipelines is in dust space, by setting high-pressure air pipe and dust space, dust is in suspended state before entering spraying material device, increase the uniformity of dust release, since setting linear silk strip and setting baffle at the bottom of scraper, dust sticking together can be scattered, dust in the upper part of storage barrel can be replenished to groove in time, ensure the persistence and stability of dust release.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of safe and environmentally friendly experiments, in particular to the field of experimental equipment for simulating a dust environment. BACKGROUND

[0002] The research and development of dust removal equipment is a very complex and arduous process, and has high accuracy requirements. Performance testing of dust removal equipment is the most important in the research and development process of dust removal equipment. The newly developed dust removal equipment cannot be directly applied to the production site for testing, so a device that can simulate the dust conditions of the production site is needed to experiment on the performance of the dust removal equipment. At present, relevant personnel have proposed many methods for simulating a dust environment, but there are many shortcomings.

[0003] Most of the current dust generating devices mainly use negative pressure to mix raw materials with air to simulate a dust environment. The existing dust generating device has the following problems: first, the screw or gear structure is used to transport dust, and the screw or gear structure is used to realize the transfer of dust. This conveying device is easy to cause dust sticking or breaking, which changes the original form of the dust, and also easily causes blockage, resulting in differences between the actual amount of dust put and the amount of dust sprayed, and the particle size of the dust, affecting the quantitative development of the experiment. For example, application number 202122349763.5, a high-stability dust generating device with adjustable concentration, and application number 201710979442.9, a solid dust aerosol generating device and method; second, the air source generated by negative pressure suction sucks the powder into a certain space and mixes with air to form a dust-containing airflow. The feeding amount of this feeding device is greatly affected by the distance between the air suction port and the powder, and the release amount and release concentration of the dust cannot be controlled. For example, application number 202120444532.X, a dust generating device. Third, the feeding device has many moving parts, and the stability of the equipment is low. Application number 201010136283.4, a rotating disc type dust aerosol generating device, dust easily affects the rotation of the rotating disc, making the device unable to continuously generate dust. The feeding device of the prior art cannot ensure uniform and stable release of dust sources, and the device has poor stability, so a dust generating device that is uniform, stable, continuous, reliable, and controllable is urgently needed.

[0004] The applicant applied for an invention on March 3, 2022, entitled a dust generating device (patent application number 2022102055836), but the patent has the following problems that need to be solved: the dust release amount is unstable, part of the dust in the storage cylinder sticks into lumps, the powder cannot be supplemented in time into the groove, there is a defect of no dust generation during operation, and the equipment has poor stability during long-term work. SUMMARY

[0005] In order to overcome the shortcomings of the prior art, such as the original particle size of the dust being easily damaged, the dust ejection amount being difficult to control, and the poor stability of the device during long time operation, the dust is generated by using the positive pressure generated by the high pressure airflow and the negative pressure at the throat of the Venturi tube. The wind speed in the high pressure blowing pipe and the Venturi tube and the rotating speed of the storage cylinder are adjusted to accurately control the dust release amount. Meanwhile, a plurality of iron wires are arranged between the scraper and the barrel cover to prevent the dust from sticking together and being difficult to supplement into the groove, and the moving parts are not in contact with the dust supply, so that the device can work stably for a long time.

[0006] According to an embodiment of the present application, a dust generating device comprises a feeding device and a spraying device.

[0007] The feeding device comprises a storage cylinder, a scraper and a motor.

[0008] A groove is arranged at the bottom of the storage cylinder for storing dust materials.

[0009] The scraper is vertically installed in the storage cylinder and is fixedly connected with the non-moving part of the storage cylinder to fix the position of the scraper. For example, in the embodiment in which the motor drives the whole storage cylinder to rotate, the scraper is fixedly connected with the non-rotating cylinder cover of the storage cylinder. In the embodiment in which the motor only drives the bottom plate of the storage cylinder to rotate, the scraper is fixedly connected with the non-rotating cylinder cover and the cylinder wall of the storage cylinder. This connection mode is more firm and can prevent the scraper from deforming. The bottom of the scraper is kept a certain gap from the surface of the bottom plate of the storage cylinder. During the movement of the storage cylinder, the excess dust materials filled in the groove at the bottom of the storage cylinder are scraped away by the scraper. The scraper is provided with a gas supplement pipe, a feeding pipe and a high pressure blowing pipe. The gas supplement pipe is connected with the atmosphere to supplement gas from the outside. The airflow blown by the high pressure blowing pipe blows up the dust in the groove. One end of the feeding pipe is connected with the throat of the Venturi tube. The gas supplement pipe, the feeding pipe and the high pressure blowing pipe are spaced apart by a certain distance and penetrate through the whole scraper and are vertically hung above the groove. The outlets of the three pipes are kept a certain distance from the bottom of the main body of the storage cylinder. A dust raising space is formed in the distance, which is communicated with the outlets of the three pipes. The airflow generated by the three pipes forms a circulation loop through the dust raising space at the bottom of the scraper.

[0010] The motor is connected with the bottom plate of the storage cylinder to rotate the storage cylinder or the bottom plate of the storage cylinder together with the motor. The cylinder cover of the storage cylinder is movably connected with the cylinder wall of the storage cylinder and does not rotate with the motor.

[0011] The spraying device comprises a Venturi tube, a feeding pipe and a fan. The inlet section and the outlet section of the Venturi tube are both cylindrical sections. The converging section and the diverging section are both conical pipes. The throat is a straight pipe section with a smaller diameter than the inlet section. A small hole is arranged in the middle of the throat of the Venturi tube to communicate with the feeding pipe. One end of the feeding pipe is connected with the communication hole, and the other end is located in the dust raising space.

[0012] The high-pressure airflow is introduced from the air compressor, enters the inlet section of the Venturi tube, and as the cross-sectional area of the tube gradually decreases, the gas flow rate gradually increases and the gas pressure decreases. After entering the throat, the gas flow rate reaches a maximum and the gas pressure reaches a minimum. Under the action of atmospheric pressure, an airflow is formed in the connecting feeding pipe at the opening position in the middle of the throat. The blowing of the high-pressure blowing pipe lifts the dust in the groove, filling the entire dust lifting space. Since the feeding pipe is located in the dust lifting space, the airflow in the feeding pipe will bring the dust in the dust lifting space into the throat of the Venturi tube under the action of the negative pressure in the feeding pipe. Under the action of the high-speed airflow in the throat, the dust is uniformly blown out from the outlet section through the diffusion section. At the same time, the storage drum or the storage drum base is rotated under the action of the motor, and the dust material is always filled in the groove of the storage drum under the action of the scraper. The air supplement pipe, the feeding pipe, the high-pressure blowing pipe, the Venturi tube, and the pipelines connected thereto on the scraper form a gas circulation. The air supplement pipe can send air into the dust lifting space, and the air supplement pipe ensures that the pressure in the dust lifting space is always the same as the atmospheric pressure.

[0013] As an improvement, the bottom of the high-pressure blowing pipe is sealed at a certain inclination angle, a small hole is opened on the sealing surface, the outlet is reduced, the wind speed of the outlet is larger, and the airflow blown from the high-pressure blowing pipe blows the dust in the groove in a certain direction.

[0014] As an improvement, the feeding pipe is located between the high-pressure blowing pipe and the air supplement pipe.

[0015] As an improvement, the invention also includes a wind speed regulator for controlling the flow rate of the wind speed entering the Venturi tube.

[0016] As an improvement, the invention also includes a speed regulator for controlling the speed of the motor. The faster the speed, the more dust material is sucked into the Venturi tube through the feeding pipe per unit time, thereby controlling the concentration of dust sprayed from the Venturi tube.

[0017] As an improvement, there is a baffle at the bottom of the scraper, which extends into the groove. Due to extrusion or moisture, the dust adhering to the inside of the groove cannot be removed. The baffle can scrape the dust adhering to the groove during the rotation of the cylinder, so that new dust can enter the groove more smoothly, ensuring the continuity of the filling of the groove.

[0018] As an improvement, a plurality of linear filaments are fixedly arranged in the vertical direction in the storage barrel. During the rotation of the cylinder, the dust material meets the fixedly arranged linear filaments, which can disperse the dust adhering to the block.

[0019] As improvement, the linear filament is iron wire, and the inside of the scraper body has a certain width of extension, which extends to the center position of the bottom of the storage cylinder, and one end of the iron wire is fixed on the scraper extension section, and the other end is fixed on the cylinder cover body.

[0020] Compared with the prior art, the dust releasing device has simple structure, can prevent the dust in the storage cylinder from sticking into lumps and not timely filling the groove, and ensures the stable dust releasing amount. The dust in the groove is lifted by airflow to fill the whole dust lifting space, solves the problems of small suction force, small dust feeding amount and non-continuous large dust feeding of the traditional suction airflow. There is a baffle at the bottom of the scraper, which can scrape the dust in the groove, improve the dust feeding amount and dust feeding initiative, and the device is stable in long-time work and has low failure rate. BRIEF DESCRIPTION OF DRAWINGS

[0021] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description, taken in conjunction with the following drawings in which:

[0022] Figure 1 Figure 1 is a schematic structural diagram of a dust generating device according to the present application;

[0023] Figure 2 Figure 2 is a sectional view of a cylinder body of the dust generating device;

[0024] Figure 3 Figure 3 is a structural diagram of a scraper of the dust generating device;

[0025] Figure 4 Figure 4 is a structural diagram of a Venturi tube of the dust generating device;

[0026] Figure 5 Figure 5 is a sectional view of an angle of the dust generating device;

[0027] Figure 6 Figure 6 is a structural diagram of the bottom of the scraper of the dust generating device;

[0028] Reference Signs:

[0029] 1, storage cylinder; 2, scraper; 3, motor; 4, groove; 5, high-pressure air blowing pipe; 6, air supplement pipe; 7, feeding pipe; 8, cylinder cover body; 9, Venturi tube; 10, baffle; 11, air speed regulator; 12, throat; 13, iron wire; 14, dust lifting space. DETAILED DESCRIPTION

[0030] Embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation of the present application.

[0031] Example 1:

[0032] according to Figure 1 , Figure 2 The dust generating device shown includes a feeding device and a spraying device.

[0033] The feeding device includes a storage cylinder 1, a scraper 2, and a motor 3. A groove 4 is provided around the bottom of the storage cylinder 1 to store dusty materials. The scraper 2 is vertically installed inside the storage cylinder 1 and fixedly connected to the cylindrical cover 8 of the storage cylinder 1. A certain gap is maintained between the bottom of the scraper 2 and the bottom plate surface of the storage cylinder 1. During the movement of the storage cylinder 1, the scraper 2 removes excess dusty materials that have filled the bottom groove 4 of the storage cylinder 1 through a scraper at the bottom. The scraper 2 is equipped with a high-pressure air blowing pipe 5, an air replenishment pipe 6, and a feeding pipe 7, wherein the air replenishment pipe 6 and the... The air supply pipe 5 is connected to the atmosphere and is naturally replenished from the outside. The airflow from the high-pressure blowing pipe 5 blows up the dust in the groove 4. One end of the feeding pipe 7 is connected to the throat of the venturi pipe 9. The air supply pipe 6, the feeding pipe 7, and the high-pressure blowing pipe 5 are spaced at a certain distance, pass through the entire scraper 2, and are vertically suspended above the groove 4. The outlets of the three pipes are a certain distance away from the bottom plate of the storage cylinder. Within this distance, a dust-raising space 14 is formed where the outlets of the three pipes are connected. The airflow generated by the three pipes forms a circulation loop through the dust-raising space 14 at the bottom of the scraper 2.

[0034] The motor 3 is connected to the bottom plate of the storage cylinder 1, so that the storage cylinder 1 rotates together with the operation of the motor 3. The cylindrical cover 8 of the storage cylinder 1 is movably connected to the cylinder wall of the storage cylinder 1, and the cylindrical cover 8 does not rotate with the motor.

[0035] like Figure 4 The spraying device includes a venturi tube 9, a feed pipe 7, and a blower. The inlet and outlet sections of the venturi tube 9 are both cylindrical sections, and the contraction and diffusion sections are both conical tubes with a cone angle of approximately 21°±2°. The throat 12 is a straight pipe section with a diameter smaller than that of the inlet section. A small hole is opened in the middle of the throat 12 of the venturi tube 9 to communicate with the feed pipe 7. One end of the feed pipe is connected to the small hole, and the other end is located in the dust-generating space 14.

[0036] The fan generates airflow, which enters the inlet section of the Venturi tube 9. When passing through the contraction section, the cross-sectional area of the tube gradually decreases, the flow rate of the gas gradually increases, and the pressure of the gas gradually decreases. After entering the throat 12, the flow rate of the gas reaches the maximum, and the pressure reaches the minimum. Under the action of atmospheric pressure, the airflow is formed in the connecting feeding pipe 7 at the middle hole position of the throat 12. The blowing of the high-pressure blowing pipe 5 lifts the dust in the groove 4, which fills the entire dust lifting space 14. Since the feeding pipe 7 is in the dust lifting space 14, the airflow in the feeding pipe 7 will bring the dust in the dust lifting space 14 into the throat 12 of the Venturi tube 9 under the action of the negative pressure in the feeding pipe 7. Under the action of the high-speed airflow in the throat 12, the dust is uniformly blown out from the outlet section through the diffusion section. At the same time, the storage cylinder 1 rotates under the action of the motor 3, and the dust material is always filled in the groove 4 of the storage cylinder under the action of the scraper 2. The air supplement pipe 6, the feeding pipe 7, the high-pressure blowing pipe 5, the Venturi tube 9, and the pipeline connected therewith on the scraper 2 form an air circulation. The air supplement pipe can send air into the dust lifting space 14, and the air supplement pipe 6 ensures that the pressure in the dust lifting space 14 is always the same as the atmospheric pressure.

[0037] When working, the motor 3 is started, and the motor 3 drives the storage cylinder 1 to rotate. The dust material in the storage cylinder 1 also rotates together, and under the action of gravity, the dust in the storage cylinder 1 moves slowly to the groove 4. Under the blocking action of the scraper 2, a certain amount of dust is always gathered on the upper part of the groove 4, ensuring that the groove 4 is filled with dust. The dust generating device is supplied with air by two external air sources. One air source uses a high-pressure gas flow regulator to adjust the air volume entering the high-pressure blowing pipe 5, so as to control the outlet wind speed, so that the wind speed can lift the dust in the groove 4. Another air source is connected to the Venturi 9. The airflow passing through the throat 12 of the Venturi tube generates a certain negative pressure, so that the dust lifted by the high-pressure blowing pipe is sucked into the throat 12 of the Venturi tube by the negative pressure in the feeding pipe 7, and finally is blown out by the airflow in the throat 12. The air supplement pipe 6, the feeding pipe 7, and the high-pressure blowing pipe 5 form a circulation loop, ensuring that the pressure in the groove 4 of the storage cylinder 1 is always the same as the atmospheric pressure.

[0038] Example 2:

[0039] As an improvement, the dust material can form blocky dust due to extrusion or moisture, in order to break up the blocky dust, different from the embodiment 1, a plurality of iron wires 13 are fixedly arranged in the vertical direction in the storage cylinder 1, in order to fix the iron wires 13, there is a certain width of extension in the inside of the main body of the scraper 2, which extends to the central position of the bottom of the storage cylinder 1, one end of the iron wire 13 is fixed on the extension section of the scraper, and the other end is fixed on the cylindrical cover body 8, during the rotation of the cylinder body, the dust material meets the linear wire 13 arranged fixedly, and the linear wire 13 can break up the dust adhered into blocks. At the same time, in order to control the wind speed in the venturi tube 9, the application also comprises a wind speed regulator 11, which is used to control the flow of the wind speed entering the venturi tube, so that the system is more stable, so as to achieve the expected dust entering amount in the experiment.

[0040] Embodiment 3

[0041] On the basis of the embodiment 2, due to extrusion or moisture, etc., the dust adhered in the groove 4 cannot be removed, there is a baffle 10 at the bottom of the scraper 2, which extends into the groove 4, the setting of the baffle can scrape the dust adhered in the groove during the rotation of the cylinder body, so that the new dust can more smoothly enter the groove, and the continuity of the groove filling is ensured, at the same time, the bottom of the high-pressure blowing pipe 5 is inclined at a certain angle, so that the airflow blown from the high-pressure blowing pipe blows the dust in the groove 4 in a certain direction, this scheme can more completely blow up the dust in the groove 4, the effect is better, and it can prevent the dust from solidifying in the groove 4 due to long-time operation of the equipment, which affects the filling of the dust into the groove 4.

[0042] According to some examples of the application, by setting the high-pressure blowing pipe 5 and the dust raising space 14, the dust can be in a suspended state before entering the venturi tube 9, and is sent into the venturi tube 9 through the feeding pipe 7, so that the system is more stable, and the dust with large particles cannot be sent into the venturi tube 9 through the feeding pipe 7. Due to the setting of the linear wire and the baffle 10 at the bottom of the scraper 2, the dust adhered into blocks can be broken up, so that the dust in the storage cylinder 1 cannot be adhered into blocks, the dust release amount is stable, the equipment can work stably for a long time, and the failure rate is low.

[0043] It is apparent to those skilled in the art that the application is not limited to the details of the foregoing exemplary embodiments, and that the application can be implemented in other concrete forms without departing from the spirit or essential characteristics of the application. Therefore, the embodiments should be considered as exemplary and non-limiting, and the scope of the application is defined by the appended claims rather than the above description, and all changes falling within the meaning and range of equivalency of the elements of the claims are intended to be embraced therein. Any reference signs in the claims should not be construed as limiting the claims to the figures in which the reference signs are used.

[0044] The above merely describes preferred embodiments of the present application, and is not intended to limit the present application, and any slight modification, equivalent replacement and improvement made to the above embodiments according to the technical essence of the present application shall be included in the protection scope of the technical scheme of the present application.

Claims

1. A dust generating device, comprising a feeding device and a spraying device; The feeding device comprises a storage cylinder (1), a scraper (2) and a motor (3), a circumferential groove (4) is arranged at the bottom of the storage cylinder (1), the scraper (2) is vertically installed in the storage cylinder (1) and is fixedly connected with a cylindrical cover body (8) to fix the position of the scraper (2), characterized in that: The scraper (2) is provided with a high-pressure air blowing pipe (5), a supplementary air pipe (6) and a feeding pipe (7), wherein the supplementary air pipe (6) is connected with the atmosphere, the airflow blown by the high-pressure air blowing pipe (5) blows up the dust in the groove (4), the high-pressure air blowing pipe (5), the supplementary air pipe (6) and the feeding pipe (7) are spaced apart by a certain distance, penetrate through the whole scraper and are vertically hung above the groove (4), the outlet of the high-pressure air blowing pipe (5), the supplementary air pipe (6) and the feeding pipe (7) is kept a certain distance from the bottom of the main body of the storage cylinder (1), and a dust raising space (14) is formed in the distance, which is communicated with the outlets of the three pipes; The motor (3) is connected with the bottom plate of the storage cylinder (1), and the motor (3) drives the storage cylinder (1) to rotate; The spraying device comprises a Venturi tube (9), a feeding pipe (7) and a fan, a small hole is opened in the middle position of the throat (12) of the Venturi tube (9) and is communicated with the feeding pipe (7), and the feeding pipe (7) penetrates through the scraper (2) and is hung above the groove (4) at the bottom of the storage cylinder (1); The bottom of the high-pressure air blowing pipe (5) is sealed with a certain inclination angle, a small hole is opened on the sealing surface, so that the airflow blown from the high-pressure air blowing pipe blows up the dust in the groove in a certain direction; The feeding pipe (7) is located between the high-pressure air blowing pipe (5) and the supplementary air pipe (6).

2. A dust generating device according to claim 1, characterized in that , further comprising a wind speed regulator (11) for controlling the flow of wind speed entering the Venturi tube (9).

3. A dust generating device according to claim 1, characterized in that , further comprising a speed regulator for controlling the rotating speed of the motor (3).

4. A dust generating device according to claim 1, characterized in that , there is a baffle (10) at the bottom of the scraper (2), which extends into the groove (4).

5. A dust generating device according to any one of claims 1-4, characterized in that , a plurality of linear wire strips are fixedly arranged in the vertical direction in the storage cylinder (1).

6. A dust generating device according to claim 5, characterized in that The linear wire strip is an iron wire, which extends by a certain width in the inside of the main body of the scraper (2) and extends to the center position at the bottom of the storage cylinder (1), one end of the iron wire is fixed on the extension segment of the scraper (2), and the other end is fixed on the cylindrical cover body (8).

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