Pressure-equalizing pulse ash removal nozzle
By designing a uniform pulse cleaning nozzle, the cone surface and the guide wall generate negative pressure, sucking in external air and mixing with the compressed air of the pulse injection system to form a uniform high-pressure air flow, the problem of uneven pulse cleaning in the prior art is solved, and efficient uniform cleaning and reduction of compressed air usage is achieved.
Patent Information
- Application Number
- CN202411547070.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-01
- Publication Date
- 2025-02-25
AI Technical Summary
In the prior art, the pulse cleaning is uneven, especially in long filter bag dust collectors, resulting in excessive cleaning of the bag mouth and poor cleaning of the bag bottom.
A pressure equalization pulse cleaning nozzle is designed, including the nozzle body, the intake end, the outlet end, the deflection wall, the intake pipe, the negative pressure intake port and the deflection column. Negative pressure is generated by the design of the cone surface and the guide wall, which draws in external air and mixes with the compressed air of the pulse injection system to form a uniform high-pressure air flow.
It realizes efficient and uniform dust cleaning, reduces the use of compressed air, ensures uniform distribution of airflow pressure, avoids the uneven pressure problem during dust cleaning of long filter bags, and increases the pressure peak value of the inner wall of the nozzle.
Smart Images
Figure CN119500428A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of bag dust removal, in particular to a pressure-equalizing pulse dust cleaning nozzle. Background Art
[0002] The pulse jet bag filter is a highly efficient dust removal device, which is widely used in dust control in the industrial field. One of the core components of the pulse jet bag filter is the pulse jet system, which determines the dust cleaning effect and operation stability of the dust collector. The jetting principle of the pulse bag filter is: in a very short time, through the rapid opening and closing of the pulse valve, the compressed air in the air bag is quickly released and sprayed into the filter bag at high speed through the jet pipe. This strong airflow will form an instantaneous high pressure inside the filter bag, causing the filter bag to expand rapidly and produce strong shaking, so that the dust particles attached to the surface of the filter bag fall off due to impact and vibration, and fall into the ash hopper for collection.
[0003] Pulse jet cleaning is the most commonly used cleaning method, but in actual engineering projects, in order to reduce floor space, construction costs, and operating and maintenance costs, long filter bags are often used in dust collectors, which poses a greater challenge to the uniformity of pulse jet cleaning. Limited by the existing nozzle form and air volume, there is a phenomenon of uneven cleaning in dust collectors that use long filter bags, and there are often problems such as excessive cleaning at the bag mouth and insufficient cleaning at the bag bottom. Summary of the invention
[0004] The object of the present invention is to provide a pressure-equalizing pulse cleaning nozzle to solve the problem of uneven pulse cleaning in the prior art and to save the amount of compressed air consumed by the spraying.
[0005] In order to achieve the above object, the solution of the present invention is: A pressure-equalizing pulse cleaning nozzle comprises a nozzle body; the upper and lower ends of the nozzle body are respectively an air inlet end and an air outlet end, a guide wall is arranged between the air inlet end and the air outlet end; the guide wall is arranged to reduce in diameter along the air inlet end toward the air outlet end; an air inlet pipe and a negative pressure air inlet surrounding the air inlet pipe are arranged in the air inlet end; the air inlet pipe is used to connect the injection pipe of a pulse injection system, and its outer wall is arranged as a conical surface, and the radius of the conical surface gradually decreases along the air inlet direction of the air inlet pipe; the slope of the conical surface is 30~50 degrees, and the length of the air inlet pipe is 70~80mm; a guide column is arranged along the axial direction of the nozzle body in the air outlet end, and cones are arranged at the upper and lower ends of the guide column.
[0006] The inner wall of the air inlet pipe is an air inlet pipeline connected to the blowing pipe, and the air inlet pipeline is coaxially arranged with the guide column.
[0007] A plurality of first ribs are connected between the circumferential surface of the air inlet pipe and the inner wall of the air inlet end, and a plurality of second ribs are connected between the circumferential surface of the guide column and the inner wall of the air outlet end.
[0008] Preferably, the first ribs and the second ribs are arranged at equal angles around the axis of the nozzle body.
[0009] The nozzle body is integrally formed by a metal casting process.
[0010] The air inlet end and the air outlet end of the nozzle body are both circular openings.
[0011] A smooth chamfer is provided at the connection between the guide wall and the air outlet end of the nozzle body.
[0012] The upper end of the guide column body is aligned with the chamfer.
[0013] The cone surface slope of the upper cone of the guide column is 30-35 degrees, and the cone surface slope of the lower cone is 40-45 degrees.
[0014] After adopting the above technical solution, the present invention has the following technical effects: (1) The nozzle body can be installed on the injection pipe of the pulse injection system of the bag filter. When the pulse valve is started, the compressed air output by the pulse valve enters through the air inlet pipe at the air inlet end and generates a certain negative pressure in the area between the cone surface and the guide wall, so that the air outside the nozzle body is affected by the negative pressure and sucked into the nozzle body through the negative pressure air inlet. Finally, the drainage air sucked in by the negative pressure and the compressed air output by the pulse valve are ejected out of the air outlet together and blown into the filter bag for cleaning. Therefore, the present invention can use less compressed air to induce a high-speed, strong, large-flow uniform airflow, thereby achieving the purpose of efficient and uniform cleaning. (2) During the spraying process, the present invention can ensure uniform distribution of airflow pressure, so that the airflow sprayed from the nozzle body is no longer concentrated only on the upper end of the filter bag, thereby avoiding the problem of poor cleaning effect caused by uneven pressure when cleaning long filter bags; (3) The present invention provides a guide column with cones at both ends, thereby reducing the gap between the guide column and the guide wall, increasing the negative pressure at the location, and effectively increasing the amount of gas ejected; (4) The overall structure of the present invention is different from the Venturi structure. The guide wall shrinks in diameter along the air inlet end toward the air outlet end and then no longer expands in diameter, which is more conducive to guiding the spray airflow into the filter bag. A larger amount of external air is sucked into the nozzle body by negative pressure. (5) Limiting the conical slope of the outer wall of the air intake pipe to 30-50 degrees as the drainage angle can effectively expand the negative pressure range of the negative pressure air inlet. At the same time, limiting the length of the air intake pipe to 70-80 mm can optimize the negative pressure and drainage air flow rate of the negative pressure air inlet. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 is a cross-sectional view of a specific embodiment of the present invention; Figure 2 A top view of a specific embodiment of the present invention; Figure 3 A bottom view of a specific embodiment of the present invention; Figure 4 A schematic diagram of airflow direction in a specific embodiment of the present invention; Figure 5 It is a schematic diagram of the use of a specific embodiment of the present invention; Description of Figure Numbers: 1-nozzle body; 1a-inlet end; 1b-outlet end; 11-guiding wall; 12-inlet pipe; 121-conical surface; 122-inlet pipe; 13-negative pressure inlet; 14-guiding column; 141-cone; 15-chamfer; 16-first rib; 17-second rib; 2-Blowing pipe; 3-Bag dust collector; 4- Pulse valve; 5-Filter bag. DETAILED DESCRIPTION
[0016] In order to further explain the technical solution of the present invention, the present invention is described in detail below through specific embodiments.
[0017] refer to Figure 1-4 As shown, the present invention discloses a pressure-equalizing pulse cleaning nozzle, comprising a nozzle body 1; The upper and lower ends of the nozzle body 1 are respectively an air inlet end 1a and an air outlet end 1b, and a guide wall 11 is arranged between the air inlet end 1a and the air outlet end 1b; the guide wall 11 is arranged with a reduced diameter along the air inlet end 1a toward the air outlet end 1b; An air inlet pipe 12 and a negative pressure air inlet port 13 surrounding the air inlet pipe 12 are provided in the air inlet end 1a; the air inlet pipe 12 is used to connect the injection pipe 2 of the pulse injection system, and its outer wall is provided with a conical surface 121, and the radius of the conical surface 121 gradually decreases along the air inlet direction of the air inlet pipe 12; the slope of the conical surface 121 (i.e. Figure 1 The angle d) is 30 to 50 degrees, and the length L of the intake pipe 12 is 70 to 80 mm; A guide column 14 is provided in the gas outlet end 1 b and is arranged along the axial direction of the nozzle body 1 . Cones 141 are provided at both the upper and lower ends of the guide column 14 .
[0018] Through the above scheme, see Figure 5The nozzle body 1 of the present invention can be installed on the injection pipe 2 of the pulse injection system of the bag dust collector 3. When the pulse valve 4 is started, the compressed air output by the pulse valve 4 enters through the air inlet pipe 12 of the air inlet end 1a, and generates a certain negative pressure in the area between the conical surface 121 and the guide wall 11, so that the air outside the nozzle body 1 is affected by the negative pressure and is sucked into the nozzle body 1 through the negative pressure air inlet 13. Finally, the drainage air sucked in by the negative pressure and the compressed air output by the pulse valve 4 are ejected out of the air outlet end 1b together and blown into the filter bag 5 for cleaning. Therefore, the present invention can use less compressed air to induce a high-speed, strong, large-flow uniform airflow, so as to achieve the purpose of efficient and uniform cleaning. During the blowing process, the present invention can ensure the uniform distribution of the airflow pressure, so that the airflow ejected from the nozzle body 1 is no longer concentrated only on the upper end of the filter bag 5. , thereby avoiding the problem of poor cleaning effect caused by uneven pressure when cleaning long filter bags; the present invention reduces the gap between the guide column 14 and the guide wall 11 by setting a guide column 14 with cones 141 at both ends, increases the negative pressure at the location, and can effectively increase the amount of air ejected; the overall structure of the present invention is different from the Venturi structure. The guide wall 11 continuously shrinks in diameter along the air inlet end 1a toward the air outlet end 1b and then no longer expands in diameter, which is more conducive to guiding the sprayed airflow into the filter bag, and a larger amount of external air is sucked into the nozzle body 1 by negative pressure; the slope of the conical surface 121 of the outer wall of the air inlet pipe 12 is limited to 30~50 degrees as the drainage angle, which can effectively expand the negative pressure range of the negative pressure air inlet 13, and at the same time, the length of the air inlet pipe 12 is limited to 70~80mm, which can optimize the negative pressure and drainage air flow rate of the negative pressure air inlet 13.
[0019] Specific embodiments of the present invention are shown below.
[0020] The slope of the cone surface of the upper cone of the guide column 14 is 30-35 degrees, and the slope of the cone surface of the lower cone is 40-45 degrees.
[0021] The inner wall of the air intake pipe 12 is an air intake conduit 122 connected to the injection pipe 2 , and the air intake conduit 122 is coaxially arranged with the guide column 14 .
[0022] A plurality of first ribs 16 are connected between the circumference of the air inlet pipe 12 (i.e., the conical surface 121) and the inner wall of the air inlet end 1a (i.e., the side wall of the negative pressure air inlet 13), and a plurality of second ribs 17 are connected between the circumference of the guide column 14 and the inner wall of the air outlet end 1b, so as to achieve relative fixation and integral connection between the air inlet pipe 12, the guide column 14 and the nozzle body 1. In this embodiment, the first ribs 16 and the second ribs 17 are arranged at equal angles around the axis of the nozzle body 1.
[0023] The nozzle body 1 is integrally formed by a metal casting process.
[0024] The air inlet end 1a and the air outlet end 1b of the nozzle body 1 are both circular openings.
[0025] A smooth chamfer 15 is provided at the connection between the guide wall 11 and the gas outlet end of the nozzle body 1 to achieve transition.
[0026] Furthermore, the upper end of the column part of the above-mentioned guide column 14 is aligned with the chamfer 15 of the guide wall 11, which can effectively reduce the gap between the guide column 14 and the guide wall 11, increase the negative pressure there, and thus effectively increase the amount of gas ejected.
[0027] When conducting structural design, CFD flow field simulation can be used to optimize the structural design of the nozzle body in order to find the best solution, maximize the coverage of the spray airflow, and enhance the cleaning effect.
[0028] Experiments have shown that, under the premise of achieving the same cleaning effect, the amount of compressed air used per unit time by the nozzle of the present invention is reduced by more than 50% compared with that of the conventional nozzle; and under the same air intake conditions and spraying distance, the peak pressure at the monitoring point on the inner and side walls of the nozzle of the present invention increases by 30% to 50% compared with the conventional nozzle.
[0029] The above embodiments and drawings do not limit the product form and style of the present invention. Any appropriate changes or modifications made by ordinary technicians in the relevant technical field should be deemed to be within the patent scope of the present invention.
Claims
1. A pressure-equalizing pulse cleaning nozzle, characterized in that: including a nozzle body; The upper and lower ends of the nozzle body are respectively an air inlet end and an air outlet end, and a guide wall is arranged between the air inlet end and the air outlet end; the guide wall is arranged with a reduced diameter along the air inlet end toward the air outlet end; An air inlet pipe and a negative pressure air inlet port surrounding the air inlet pipe are arranged in the air inlet end; the air inlet pipe is used to connect the injection pipe of the pulse injection system, and its outer wall is arranged as a conical surface, and the radius of the conical surface gradually decreases along the air inlet direction of the air inlet pipe; the slope of the conical surface is 30-50 degrees, and the length of the air inlet pipe is 70-80 mm; The gas outlet end is provided with a guide column arranged along the axial direction of the nozzle body, and cones are arranged at both the upper and lower ends of the guide column.
2. The pressure-equalizing pulse cleaning nozzle according to claim 1, characterized in that: The inner wall of the air inlet pipe is an air inlet pipeline connected to the blowing pipe, and the air inlet pipeline is coaxially arranged with the guide column.
3. The pressure-equalizing pulse cleaning nozzle according to claim 1, characterized in that: A plurality of first ribs are connected between the circumferential surface of the air inlet pipe and the inner wall of the air inlet end, and a plurality of second ribs are connected between the circumferential surface of the guide column and the inner wall of the air outlet end.
4. The pressure-equalizing pulse cleaning nozzle according to claim 3, characterized in that: The first ribs and the second ribs are arranged around the axis of the nozzle body at equal angles.
5. The pressure-equalizing pulse cleaning nozzle according to claim 1, characterized in that: The nozzle body is integrally formed by a metal casting process.
6. The pressure-equalizing pulse cleaning nozzle according to claim 1, characterized in that: The air inlet end and the air outlet end of the nozzle body are both circular openings.
7. The pressure-equalizing pulse cleaning nozzle according to claim 1, characterized in that: A smooth chamfer is provided at the connection between the guide wall and the air outlet end of the nozzle body.
8. The pressure-equalizing pulse cleaning nozzle according to claim 7, characterized in that: The upper end of the guide column body is aligned with the chamfer.
9. The pressure-equalizing pulse cleaning nozzle according to claim 1, characterized in that: The cone surface slope of the upper cone of the guide column is 30-35 degrees, and the cone surface slope of the lower cone is 40-45 degrees.