Anti-clogging nozzle for a spray granulation apparatus

Abstract

The utility model relates to ceramic material processing technical field, concretely relates to a kind of anti-blocking nozzle of spray granulation equipment, including conveying main pipe and the discharge head rotatably connected with conveying main pipe, the inside of conveying main pipe and discharge head forms slurry channel for conveying slurry, the inside of discharge head is formed with air cavity, there is at least one first air hole on the circumferential wall of air cavity, the sidewall of conveying main pipe is equipped with the second air hole compatible with first air hole. By rotating discharge head control air hole misplacement and alignment, slurry channel and clean air path are completely isolated from mechanical structure, the possibility of slurry counterpermeation blockage air path is eradicated, and reliability is extremely high. The third air hole of inclined design can converge high-pressure airflow into a precise jet that shoots at the discharge end, with concentrated energy and strong scouring power, which can quickly remove blockages and significantly improve cleaning efficiency.

Description

Technical Field

[0001] This utility model relates to the field of ceramic material processing technology, and in particular to an anti-clogging nozzle for a spray granulation device. Background Technology

[0002] Spray granulation is a core process for preparing microspheres in ceramics, chemical, and pharmaceutical industries. The stable operation of the nozzle directly determines production efficiency and product quality. In actual production, ceramic slurry, due to its high solids content and tendency to gel, easily accumulates and solidifies inside the nozzle and at the outlet, leading to blockage. This has long been a common problem plaguing the industry.

[0003] To address this issue, existing technologies often employ additional air purging or built-in mechanical structures. For example, a bypass air path is used for backflushing during shutdown, or a piston mechanism that opens and closes based on fluid pressure is installed within the nozzle. However, these methods have inherent drawbacks: the bypass air path may become blocked by slurry backflow during normal operation, eventually leading to its failure; while the built-in piston structure, driven by pressure differential, has a slow response, cannot operate effectively during the initial setting stage of the slurry, and is complex, costly to manufacture, and lacks reliability.

[0004] Therefore, there is an urgent need for an anti-clogging nozzle solution that can fundamentally prevent slurry backflow, achieve active and reliable isolation, and is simple in structure and easy to maintain. Utility Model Content

[0005] In view of this, the purpose of this utility model is to propose an anti-clogging nozzle for a spray granulation device to solve the problem.

[0006] To achieve the above objectives, this utility model provides an anti-clogging nozzle for a spray granulation device, comprising a conveying main pipe and a discharge head rotatably connected to the conveying main pipe. The interior of the conveying main pipe and the discharge head forms a slurry channel for conveying slurry. The interior of the discharge head forms an air cavity, and the circumferential wall of the air cavity has at least one first air hole. The side wall of the conveying main pipe is provided with a second air hole adapted to the first air hole. When the discharge head rotates to a first position, the first air hole and the second air hole are misaligned, and the air cavity is isolated from the slurry channel. When the discharge head rotates to a second position, the first air hole and the second air hole are aligned, forming a flushing airflow channel connecting a high-pressure air source and the slurry channel.

[0007] As a preferred embodiment of this utility model, a pneumatic connector is externally connected to the discharge head, and one end of the pneumatic connector passes through the outside of the discharge head and enters the air chamber.

[0008] As a preferred embodiment of this utility model, the conveying main pipe has a third air hole formed at the end of its second air hole, and the third air hole is inclined and points towards the discharge end of the discharge head.

[0009] As a preferred embodiment of this utility model, the inner wall of the discharge head is formed with an annular inner edge plate, and the circumferential side of the annular inner edge plate is provided with a fourth air hole corresponding to the third air hole.

[0010] As a preferred embodiment of this utility model, an annular plate is provided on the outer circumferential surface of the conveying main pipe. The annular plate is rotatably engaged with an annular groove formed on the inner side wall of the discharge head. An annular cover plate is detachably provided below the annular groove of the discharge head to prevent the annular plate from disengaging from the annular groove.

[0011] As a preferred embodiment of this utility model, the nozzle further includes a positioning bolt, a first positioning hole is provided inside the discharge head, and a second positioning hole adapted to the first positioning hole is provided on the surface of the annular cover plate. The positioning bolt passes through and connects the first positioning hole and the second positioning hole in sequence. By tightening the positioning bolt, the annular cover plate can be driven to squeeze the annular plate to generate rotational damping.

[0012] As a preferred embodiment of this utility model, the outer circumferential surface of the conveying main pipe is provided with external threads and prisms for assisting rotation.

[0013] As a preferred embodiment of this invention, the air cavity is an annular chamber.

[0014] The beneficial effects of this utility model are: 1. Achieves physical isolation between working and cleaning states: By controlling the misalignment and alignment of the air holes through rotating the discharge head, the slurry channel and the cleaning air path are completely isolated from the mechanical structure, eliminating the possibility of slurry back osmosis clogging the air path, resulting in extremely high reliability.

[0015] 2. Provides precise and efficient cleaning capabilities: The inclined design of the third air hole can converge the high-pressure airflow into a concentrated jet that is precisely directed towards the discharge end. The energy is concentrated, the flushing force is strong, and it can quickly remove blockages, significantly improving cleaning efficiency.

[0016] 3. The internal structure has been optimized to prevent secondary blockage: the fourth vent on the inner ring plate is extremely shallow, which effectively avoids the formation of new slurry accumulation dead cavities due to the opening of vents, and ensures smooth flow of the inner wall of the flow channel while enhancing airflow.

[0017] 4. Improved overall structural stability and ease of use: The unique rotating connection and adjustable damping design ensure the stability of the rotating parts connection and effectively prevent misoperation; the external thread and prism design greatly facilitate the installation, disassembly and angle adjustment of the nozzle, making maintenance convenient. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a partial three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of a half-section of the present invention; Figure 3 This is a schematic diagram of the half-section three-dimensional structure of this utility model; Figure 4 This is a three-dimensional structural diagram of the present invention in a semi-disassembled state; Figure 5 This is a schematic diagram of the external three-dimensional structure of the present invention; Figure 6 This is a three-dimensional structural diagram of the third vent and sealing ring of this utility model.

[0020] The markings in the diagram are as follows: 1. Conveying main pipe; 2. External thread; 3. Discharge head; 4. Discharge end; 5. Air chamber; 6. Pneumatic connector; 7. First air hole; 8. Second air hole; 9. Third air hole; 10. Annular inner edge plate; 11. Fourth air hole; 12. Annular plate; 13. Annular groove; 14. Annular cover plate; 15. Positioning bolt; 16. First positioning hole; 17. Second positioning hole; 18. Prism; 19. Movable stop; 20. First fixed stop; 21. Second fixed stop; 22. Sealing ring. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments.

[0022] It should be noted that, unless otherwise defined, the technical or scientific terms used in this utility model should have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0023] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, an anti-clogging nozzle for a spray granulation device includes a conveying main pipe 1 and a discharge head 3 rotatably connected to the conveying main pipe 1. The interiors of the conveying main pipe 1 and the discharge head 3 form a slurry channel for conveying slurry. The interior of the discharge head 3 forms an air chamber 5. The circumferential wall of the air chamber 5 has at least one first air hole 7. The side wall of the conveying main pipe 1 is provided with a second air hole 8 adapted to the first air hole 7. When the discharge head 3 rotates to a first position, the first air hole 7 and the second air hole 8 are misaligned, and the air chamber 5 is isolated from the slurry channel. When the discharge head 3 rotates to a second position, the first air hole 7 and the second air hole 8 are aligned, forming a flushing airflow channel connecting a high-pressure air source and the slurry channel. The above technical solution solves the problems of slurry backflow clogging the air passage during cleaning in existing nozzles, and the potential for slurry intrusion into the annular slit design under normal operating conditions. Specifically, its working principle involves rotating the discharge head 3 to change the relative positions of the first air hole 7 and the second air hole 8, thereby connecting or isolating the slurry channel from the scouring airflow channel. During normal spray granulation, the discharge head 3 is rotated to the first position, at which point the first air hole 7 and the second air hole 8 are misaligned, completely isolating the air chamber 5 from the slurry channel, allowing slurry to be transported normally without leakage risk. When cleaning is required, the slurry supply is stopped, and the discharge head 3 is rotated to the second position, aligning the first air hole 7 and the second air hole 8. Then, the high-pressure air source is turned on, and the high-pressure gas flows sequentially through the air chamber 5, the first air hole 7, and the second air hole 8 into the slurry channel, forming a strong scouring airflow that is ejected from the discharge end 4. This mechanical physical isolation ensures that the working and cleaning states do not interfere with each other, fundamentally preventing air passage blockage and achieving efficient, directional cleaning.

[0024] like Figure 2 and Figure 3 As shown, in this embodiment, a pneumatic connector 6 is connected to the outside of the discharge head 3, and one end of the pneumatic connector 6 passes through the outside of the discharge head 3 and enters the air chamber 5. The above technical solution solves the structural problem of how to reliably connect the air path to the rotating component and introduce high-pressure gas. Specifically, its working principle is to provide a stable and reliable gas input channel for the air chamber 5. During operation, the external air pipe is connected to the pneumatic connector 6, and the high-pressure gas can directly enter the air chamber 5 for later use through this connector. This simplifies the external air path layout, ensures airtightness, and makes the entire nozzle modular, facilitating installation and maintenance.

[0025] like Figure 1 , Figure 3 and Figure 4 As shown, in this embodiment, the conveying main pipe 1 has a third air hole 9 formed at the end of its second air hole 8. The third air hole 9 is inclined and points towards the discharge end 4 at the end of the discharge head 3. The above technical solution solves the problems of dispersed cleaning airflow, high energy loss, and insufficient cleaning power at key blockage points within the slurry channel. Specifically, its working principle is to act as a guide and acceleration structure for the flushing airflow after it enters the slurry channel. Because the third air hole 9 is inclined and points towards the discharge end 4, when high-pressure gas passes through, it is guided to form a concentrated jet, directly spraying the discharge end 4 area most prone to blockage. During operation, in cleaning mode, the airflow, after passing through the second air hole 8, precisely rushes towards the discharge end 4 through the inclined third air hole 9, focusing flushing energy and significantly improving the cleaning efficiency and power at the discharge end 4, achieving rapid unblocking.

[0026] like Figure 3 and Figure 4 As shown, in this embodiment, an annular inner edge plate 10 is formed on the inner wall of the discharge head 3, and a fourth air hole 11 corresponding to the third air hole 9 is opened on the circumferential side of the annular inner edge plate 10. The above technical solution solves the problem of slurry retention and blockage caused by opening auxiliary air holes in the airflow channel. Specifically, its working principle is as follows: the thickness of the annular inner edge plate 10 is very thin, and the depth of the fourth air hole 11 on it is correspondingly shallow. During operation, in the cleaning state, the fourth air hole 11 is aligned with the third air hole 9, forming an airflow channel together; in the spray state, even if a small amount of slurry adheres to it, it cannot form an effective accumulation due to the shallowness of the hole. While enhancing the cleaning airflow, it ensures that the inner wall of the nozzle is smooth and free of dead space, fundamentally eliminating the risk of secondary blockage.

[0027] like Figure 3 and Figure 4As shown, in this embodiment, an annular plate 12 is provided on the outer circumferential surface of the conveying main pipe 1. The annular plate 12 is rotatably engaged with the annular groove 13 opened on the inner side wall of the discharge head 3. An annular cover plate 14 is detachably provided below the annular groove 13 of the discharge head 3 to prevent the annular plate 12 from disengaging from the annular groove 13. The above technical solution solves the problems of easy axial loosening and poor stability of rotating components in rotary nozzles. Specifically, its working principle is as follows: the annular plate 12 is inserted into the annular groove 13, allowing them to rotate relative to each other while being axially constrained; the annular cover plate 14 seals the annular plate 12 in the annular groove 13 from below, preventing it from falling off. During operation, after assembling this structure, the discharge head 3 can rotate smoothly around the conveying main pipe 1 without being pulled off, achieving a stable and reliable rotating connection, ensuring that the nozzle maintains its structural integrity under long-term vibration, and facilitating disassembly and maintenance.

[0028] like Figure 3 and Figure 4 As shown, in this embodiment, the nozzle also includes a positioning bolt 15, the inside of the discharge head 3 is provided with a first positioning hole 16, and the surface of the annular cover plate 14 is provided with a second positioning hole 17 that matches the first positioning hole 16. The positioning bolt 15 passes through and connects the first positioning hole 16 and the second positioning hole 17 in sequence. By tightening the positioning bolt 15, the annular cover plate 14 can be driven to squeeze the annular plate 12 to generate rotational damping. The above technical solution solves the problem of the discharge head 3 easily rotating out of position due to accidental contact or vibration during operation or cleaning. Specifically, its working principle is to tighten the positioning bolt 15, pull the annular cover plate 14 upward, and squeeze the annular plate 12, providing damping for its rotation through friction. During operation, the positioning bolt 15 can be tightened or loosened as needed to adjust the force required to rotate the discharge head 3. This provides adjustable rotational damping, enhances the stability of the nozzle's working state, prevents misoperation, and does not affect normal function switching. Furthermore, to facilitate installation from the side of the discharge head 3, the annular cover plate 14 is preferably a semi-annular split design, that is, two left and right half-rings form a complete annular cover plate 14, which facilitates installation from both sides of the discharge head 3.

[0029] like Figure 1 As shown, in this embodiment, the outer circumferential surface of the conveying main pipe 1 is provided with an external thread 2 and a prism 18 for assisting rotation; The above technical solution solves the problems of inconvenient installation and disassembly of nozzles on equipment, as well as difficulty in applying force to rotate them during debugging. Specifically, its working principle is as follows: the external thread 2 is used to screw the entire nozzle onto the main unit of the spray granulation equipment to achieve a sealed fixation; the prism 18, such as a hexagonal prism, provides a point of leverage for tools such as wrenches. During operation, by using a tool to hold the prism 18, the conveying main pipe 1 can be easily screwed on and off to install, disassemble, or adjust the circumferential angle of the nozzle. This simplifies the installation process, facilitates maintenance, and allows for flexible adjustment of the overall nozzle angle to adapt to different working conditions.

[0030] like Figure 1 and Figure 4 As shown, in this embodiment, the air chamber 5 is an annular chamber; The above technical solution solves the problems of uneven airflow pressure distribution and cleaning effect dependent on the rotation angle that may result from a non-annular air chamber. Specifically, its working principle is to form a continuous and uniform pressurized gas storage space surrounding the slurry channel. During operation, after the high-pressure gas enters the annular chamber through the pneumatic connector 6, it is evenly distributed across the entire circumference, ensuring that the first air hole 7 receives a consistent air pressure regardless of the rotation angle of the discharge head 3. This guarantees stable and uniform flushing airflow pressure, provides consistent and reliable cleaning performance, and simplifies the manufacturing process of the air chamber 5.

[0031] like Figure 5 As shown, in this embodiment, the bottom end of the discharge head 3 is provided with a movable stop 19, and the prism 18 is provided with a first fixed stop 20 and a second fixed stop 21 corresponding to the rotation angles of the first position and the second position, respectively. The above technical solution solves the problem of inaccurate judgment and repeated positioning of the "first position" and "second position" in the original solution. Specifically, its working principle is as follows: the movable stop 19 rotates synchronously with the discharge head 3. When it rotates to abut against the first fixed stop 20, it reaches the "first position," at which point the first air hole 7 and the second air hole 8 are completely misaligned, and the air passage is cut off. When it rotates to abut against the second fixed stop 21, it reaches the "second position," at which point the first air hole 7 and the second air hole 8 are completely aligned, and the air passage is connected. During operation, the operator can know that the target position has been accurately reached by rotating the discharge head 3 until a clear mechanical limit is felt when the stop is abutted. It provides clear and reliable tactile feedback, ensuring accurate and repeatable state switching, thereby ensuring stable operation of the working and cleaning modes.

[0032] like Figure 5 As shown, in this embodiment, the third air hole 9 has an annular sealing groove on the end face of its side that is in contact with the annular inner edge plate 10, and a sealing ring 22 is provided in the sealing groove. The above technical solution can solve the risk of slurry backflow or high-pressure gas leakage caused by the gap between the mating surfaces due to the misalignment of the air holes in the original solution. Specifically, its working principle is: no matter whether the discharge head 3 is rotated to the "first position" or the "second position", the sealing ring 22 always maintains a tight elastic contact with the inner end face of the annular inner edge plate 10 under pressure, forming a dynamic seal. It can achieve reliable sealing in both working states, completely eliminating cross-contamination, thereby greatly improving the reliability and life of the nozzle.

[0033] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the present invention is limited to these examples; within the framework of the present invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in the details for the sake of brevity.

[0034] This utility model aims to cover all such substitutions, modifications, and variations that fall within its protection scope. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within its protection scope.

Claims

1. A clogging-resistant nozzle for a spray granulation device, comprising a conveying main pipe (1) and a discharge head (3) rotatably connected to the conveying main pipe (1), wherein the interiors of the conveying main pipe (1) and the discharge head (3) form a slurry channel for conveying slurry, characterized in that, The discharge head (3) has an air cavity (5) inside. The air cavity (5) has at least one first air hole (7) on its circumferential wall. The side wall of the conveying main pipe (1) is provided with a second air hole (8) that matches the first air hole (7). When the discharge head (3) rotates to the first position, the first air hole (7) and the second air hole (8) are misaligned, and the air cavity (5) is isolated from the slurry channel. When the discharge head (3) rotates to the second position, the first air hole (7) and the second air hole (8) are aligned and form a flushing airflow channel that connects the high-pressure air source and the slurry channel.

2. The anti-clogging nozzle of the spray granulation equipment according to claim 1, characterized in that, The discharge head (3) is externally connected to a pneumatic connector (6), one end of which passes through the outside of the discharge head (3) and enters the air chamber (5).

3. The anti-clogging nozzle of the spray granulation equipment according to claim 1, characterized in that, The conveying main pipe (1) has a third air hole (9) formed at the end of its second air hole (8), and the third air hole (9) is inclined and points to the discharge end (4) at the end of the discharge head (3).

4. The anti-clogging nozzle of the spray granulation equipment according to claim 3, characterized in that, The inner wall of the discharge head (3) is formed with an annular inner edge plate (10), and the circumferential side of the annular inner edge plate (10) is provided with a fourth air hole (11) corresponding to the third air hole (9).

5. The anti-clogging nozzle of the spray granulation equipment according to claim 1, characterized in that, The outer circumferential surface of the conveying main pipe (1) is provided with an annular plate (12), which is rotatably engaged with an annular groove (13) opened on the inner side wall of the discharge head (3). The discharge head (3) is detachably provided with an annular cover plate (14) below the annular groove (13) to prevent the annular plate (12) from disengaging from the annular groove (13).

6. The anti-clogging nozzle of the spray granulation equipment according to claim 5, characterized in that, The nozzle also includes a positioning bolt (15). The discharge head (3) has a first positioning hole (16) inside. The surface of the annular cover plate (14) has a second positioning hole (17) that matches the first positioning hole (16). The positioning bolt (15) passes through and connects the first positioning hole (16) and the second positioning hole (17) in sequence. By tightening the positioning bolt (15), the annular cover plate (14) can be driven to squeeze the annular plate (12) to generate rotational damping.

7. The anti-clogging nozzle of the spray granulation equipment according to claim 6, characterized in that, The outer circumferential surface of the conveying main pipe (1) is provided with an external thread (2) and a prism (18) for auxiliary rotation.

8. The anti-clogging nozzle of the spray granulation equipment according to claim 1, characterized in that, The air cavity (5) is an annular chamber.

Images