Spraying device

Abstract

The application relates to a spraying device, which comprises a mother pipe, a plurality of first nozzles and a secondary spraying unit. All the first nozzles are connected to the mother pipe and are arranged in at least one row along the longitudinal direction of the mother pipe, and the distance between two adjacent first nozzles in the same row is equal to the distance between the openings of two adjacent heat exchange pipes in a condenser. The secondary spraying unit is arranged on at least one side of the first nozzles along the circumferential direction of the mother pipe. The secondary spraying unit comprises a branch pipe assembly and a plurality of second nozzles, and the branch pipe assembly is communicated with the mother pipe. All the second nozzles are connected to the branch pipe assembly and are arranged in at least one row along the longitudinal direction of the mother pipe. The water spraying directions of all the second nozzles are the same as those of the first nozzles. The secondary spraying unit arranged on the side of the mother pipe can improve the hole flushing coverage of the spraying device, reduce the overall flushing time and increase the overall flushing efficiency of the sprayer.

Description

Technical Field

[0001] This application relates to the field of spraying device technology, and in particular to a spraying device. Background Technology

[0002] In the field of condenser heat exchanger tube cleaning, the spraying device moves the rows of nozzles during its movement, so that the nozzles accurately aim the water flow at the center of the tube opening of each heat exchanger tube, so as to effectively clean the dirt on the tube opening, inner wall and tube sheet hole bridge area of ​​the heat exchanger tube, and complete the cleaning of the heat exchanger tube.

[0003] However, in the existing technology, due to the limitations of the movement path of the spray device and the structure of the main tube, the spray device can only be set with one main tube on one path; and due to the shape limitation of the main tube, a maximum of two rows of nozzles can generally be set on one main tube. Therefore, the existing spray device cannot meet the requirement of maximizing efficiency by achieving the required coverage of the flushing of the heat exchange tubes. Utility Model Content

[0004] Therefore, it is necessary to provide a spraying device to address the aforementioned problems.

[0005] A spraying device for flushing condenser heat exchange tubes, the spraying device comprising:

[0006] Mother tube;

[0007] A plurality of first nozzles, all of which are fitted onto the main tube and arranged at intervals along the longitudinal direction of the main tube to form at least one column, wherein the distance between two adjacent first nozzles in the same column is equal to the distance between the openings of two adjacent heat exchange tubes in the condenser; and

[0008] The secondary spray unit is disposed on at least one side of the first nozzle along the circumference of the main pipe; the secondary spray unit includes a branch pipe assembly and a plurality of second nozzles, the branch pipe assembly being connected to the main pipe; all the second nozzles are fitted onto the branch pipe assembly and are arranged at intervals along the longitudinal direction of the main pipe to form at least one row; the spray direction of all the second nozzles is the same as the spray direction of the first nozzle.

[0009] In one embodiment, the branch pipe assembly includes a plurality of branch pipes, all of which are spaced apart from each other on the main pipe along its longitudinal direction; at least one second nozzle is attached to one of the branch pipes.

[0010] In one embodiment, all the first nozzles are arranged in a row along the longitudinal direction of the main tube, and there is a first preset distance L1 between the first nozzles in the row and the second nozzles in the adjacent row. There is a second preset distance L2 between two adjacent rows of heat exchange tubes in the condenser. L1 and L2 satisfy the condition: L1≥NL2, and N is a positive integer.

[0011] In one embodiment, a secondary spraying unit is provided on each of the opposite sides of the first nozzle in the column along the circumference of the main tube, and all the second nozzles in the two secondary spraying units are arranged at intervals along the longitudinal direction of the main tube to form a column; the distance between the two columns of second nozzles and the column of first nozzles is equal.

[0012] In one embodiment, all the first nozzles are arranged in two rows at intervals along the longitudinal direction of the main tube, and there is a third preset distance L3 between the two rows of first nozzles. There is a second preset distance L2 between two adjacent rows of heat exchange tubes in the condenser. L2 and L3 satisfy the condition: L1=L2.

[0013] The two columns of the first nozzles are staggered, and another column of the first nozzles is arranged on the vertical line between two adjacent first nozzles in the same column. The center line connecting the three first nozzles forms an equilateral triangle.

[0014] In one embodiment, a secondary injection unit is provided on each side of the two rows of first nozzles that are opposite to each other, and all the second nozzles in the two secondary injection units are arranged in a row along the longitudinal direction of the main tube; the two rows of second nozzles and the adjacent row of first nozzles have a fourth preset distance L4 and a fifth preset distance L5, respectively, and L4 and L5 satisfy the condition: L4=L5.

[0015] In one embodiment, there is a second preset distance L2 between two adjacent rows of heat exchange tubes in the condenser. L2, L4 and L5 satisfy the conditions: L4≥2NL2, L5≥2NL2, and N is a positive integer.

[0016] In one embodiment, the system further includes an installation assembly comprising a mounting base and a connector. The mounting base includes two mounting sections that are cross-connected to form an L-shaped structure, and the opposite ends of the two mounting sections are engaged with the periphery of the main tube. The connector is connected between the mounting base and each of the second nozzles.

[0017] In one embodiment, the connector includes two connecting segments that are cross-connected to form an L-shaped structure, and one of the two connecting segments is fitted and fixed to one of the two mounting segments, while the other of the two connecting segments is flush with the other of the two mounting segments and is mated with each of the second nozzles.

[0018] In one embodiment, at least one of the mounting base and the connector has a through-hole for weight reduction.

[0019] The aforementioned spraying device includes a main pipe, several first nozzles, and a secondary spraying unit. All first nozzles are connected to the main pipe and arranged at intervals along its longitudinal direction to form at least one row, with the distance between two adjacent first nozzles in the same row being equal to the distance between the openings of two adjacent heat exchange tubes in the condenser. The secondary spraying unit is located on at least one side of the first nozzles along the circumference of the main pipe. The secondary spraying unit includes a branch pipe assembly and several second nozzles, with the branch pipe assembly connected to the main pipe. All second nozzles are connected to the branch pipe assembly and arranged at intervals along the longitudinal direction of the main pipe to form at least one row. The spray direction of all second nozzles is the same as that of the first nozzles. By adding a secondary spraying unit to the side of the main pipe, the coverage of the orifice flushing of the spraying device is improved, the overall flushing operation time is reduced, and the overall flushing efficiency of the sprayer is increased. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the spraying device in this application from a first-view perspective.

[0021] Figure 2 This is a schematic diagram of the spraying device in this application from a second perspective.

[0022] Figure 3 for Figure 2 A magnified schematic diagram of a portion of area A in the middle.

[0023] Figure 4 This is a cross-sectional structural diagram of the spraying device in this application.

[0024] Figure Labels

[0025] Spraying device 100;

[0026] 1. Main pipe; 2. First nozzle; 3. Second nozzle; 4. Branch pipe; 6. Mounting base; 5. Connector; 7. Weight reduction hole;

[0027] First preset spacing L1; third preset spacing L3; fourth preset spacing L4; fifth preset spacing L5. Detailed Implementation

[0028] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0029] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0030] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0031] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0032] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0033] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0034] In the field of condenser heat exchanger tube cleaning, the spraying device moves the rows of nozzles during its movement, so that the nozzles accurately aim the water flow at the center of the tube opening of each heat exchanger tube, so as to effectively clean the dirt on the tube opening, inner wall and tube sheet hole bridge area of ​​the heat exchanger tube, and complete the cleaning of the heat exchanger tube.

[0035] However, in the existing technology, due to the limitations of the movement path of the spray device and the structure of the main pipe, only one main pipe can be set on the spray device along one path. Moreover, due to the shape limitations of the main pipe, generally only a maximum of two rows of nozzles can be set on one main pipe. Therefore, the existing spray device cannot meet the requirement of maximizing efficiency by achieving the required perforation flushing coverage of the heat exchange tube.

[0036] Therefore, to resolve the above issues, please refer to [link / reference needed]. Figures 1 to 4 In one or more embodiments of this application, a spraying device 100 for flushing condenser heat exchange tubes is provided. By adding a secondary spraying unit on the side of the main tube 1, the flushing coverage of the spraying device 100 is improved, the overall flushing operation time is reduced, and the overall flushing efficiency of the sprayer is increased.

[0037] Please see Figure 1 and Figure 2The injection device 100 includes a main pipe 1, a plurality of first nozzles 2, and a secondary injection unit. All the first nozzles 2 are connected to the main pipe 1 and arranged at intervals along the longitudinal direction of the main pipe 1 to form at least one row, with the distance between two adjacent first nozzles 2 in the same row being equal to the distance between the openings of two adjacent heat exchange tubes in the condenser. The secondary injection unit is located on at least one side of the first nozzles 2 along the circumference of the main pipe 1. The secondary injection unit includes a branch pipe assembly 4 and a plurality of second nozzles 3, the branch pipe assembly 4 being connected to the main pipe 1. All the second nozzles 3 are connected to the branch pipe assembly 4 and arranged at intervals along the longitudinal direction of the main pipe 1 to form at least one row. The spray direction of all the second nozzles 3 is the same as the spray direction of the first nozzles 2.

[0038] Understandably, when the spraying device 100 performs flushing operations on the condenser heat exchange tubes, the first nozzles 2 on the main tube 1 sequentially aim at the inlets of each heat exchange tube in the condenser and spray flushing medium into the inlets to clean the dirt on the inlets, inner walls, and tube sheet perforation areas of the heat exchange tubes. Furthermore, this application adds a secondary spraying unit to the side of the main tube 1, and the second nozzles 3 on the branch tube 4 assembly 1 also aim at the inlets of other heat exchange tubes in the condenser. By connecting the branch tube 4 assembly 1 to the main tube 1, the flushing medium in the main tube 1 can flow through the branch tube 4 assembly 1 into each second nozzle 3, and finally be sprayed out from the second nozzle 3 to easily clean the heat exchange tubes it is aligned with. Thus, by cooperating with the first nozzles 2 on the main tube 1 and the second nozzles 3 on the added secondary spraying unit, the coverage of the flushing of the spraying device 100 can be effectively improved, the overall flushing operation time can be reduced, and the overall flushing efficiency of the sprayer can be increased. Furthermore, the spraying device 100 in this application has a simple structure and is easy to maintain and repair, which further improves its feasibility and practicality in actual applications.

[0039] In some embodiments, see Figure 3 and Figure 4 The branch pipe assembly 1 includes several branch pipes 4, all of which are spaced apart and connected to the main pipe 1 along its longitudinal direction. At least one second nozzle 3 is connected to each branch pipe 4.

[0040] Understandably, by independently connecting a limited number of second nozzles 3 to a single branch pipe 4, it is beneficial to repair or replace the branch pipe 4 and its corresponding second nozzle 3 separately when problems such as blockage or damage occur, without having to disassemble the entire spraying device 100 on a large scale, which greatly reduces maintenance costs and repair time.

[0041] In this application, the specific number of rows of the first nozzle 2 and the specific number of rows of the second nozzle 3 are not limited. In some embodiments, not shown in the figure, all the first nozzles are arranged at intervals along the longitudinal direction of the main tube to form a row, and there is a first preset distance L1 between the row of first nozzles and the row of second nozzles adjacent to it. There is a second preset distance L2 between two adjacent rows of heat exchange tubes in the condenser. L1 and L2 satisfy the condition: L1≥NL2, and N is a positive integer.

[0042] It is understandable that when L1 and L2 satisfy the condition: L1≥NL2, and N is a positive integer, it can be ensured that there is sufficient gap between the heat exchange tube column corresponding to the first nozzle and the adjacent second nozzle to avoid mutual interference during the flushing process.

[0043] Furthermore, by adjusting the value of N, the first nozzle and the adjacent second nozzle can simultaneously flush different heat exchange tube columns. By combining the movement path of the spray device, the flushing coverage of the holes can be improved.

[0044] For example, when N is 1, the interval between the first nozzle and the adjacent second nozzle is exactly the distance between two adjacent heat exchange tubes. Thus, during the movement of the spray device, after the first nozzle and the adjacent second nozzle complete one rinsing operation on two adjacent heat exchange tubes, they need to be controlled to move a distance of twice L2 so that they can be re-aligned with the adjacent heat exchange tubes to be rinsed. In this way, the spray device 100 provided in this application can simultaneously clean multiple heat exchange tubes, effectively shortening the rinsing time and improving rinsing efficiency.

[0045] When N is 2, when the first nozzle and the adjacent second nozzle are rinsing two corresponding rows of heat exchange tubes, there is still one row of heat exchange tubes between the two rows that have not been aligned for rinsing. Therefore, during the movement of the spray device, after the first nozzle and the adjacent second nozzle 3 complete one rinsing operation on the two corresponding rows of heat exchange tubes, they need to be controlled to move a distance of 1 L2 so that they can rinse one row of heat exchange tubes and the other corresponding heat exchange tube between the two rows of heat exchange tubes. Subsequently, the first nozzle and the adjacent second nozzle need to be further controlled to move a distance of 3 L2 so that they are realigned with the two rows of heat exchange tubes to be rinsed, and the above operation is repeated.

[0046] It should be noted that different values ​​of N will result in different movement paths for the jetting device. In practical applications, users can rationally select the value of N based on the actual number of heat exchanger tubes in the condenser, and combine this with optimization of the jetting device's movement path to develop the most suitable flushing scheme for condenser heat exchanger tubes of different structures and specifications.

[0047] Furthermore, not shown in the figure, each of the first nozzles in the column is provided with a primary spray unit on both sides of the main tube along the circumference, and all the second nozzles in the two secondary spray units are arranged in a row along the longitudinal direction of the main tube 1. In this way, the second nozzles in the secondary spray units on both sides of the main tube can simultaneously flush different heat exchange tube rows with the first nozzles on the main tube 1, which can effectively improve the flushing coverage of the spray device, reduce the overall flushing operation time, and increase the overall flushing efficiency of the sprayer.

[0048] It is understood that in this application, the spacing between the two rows of second nozzles and the row of first nozzles is equal. This simplifies the movement path of the spraying device and improves rinsing efficiency.

[0049] Specifically, when N is 1, the first nozzle and the two rows of second nozzles respectively located on both sides of it are aligned with three heat exchange tubes arranged in sequence. Thus, during the movement of the spray device, after the first nozzle and the two rows of second nozzles respectively located on both sides of it complete one flushing operation on the three heat exchange tubes arranged in sequence, it is necessary to control the three to move a distance of 3 times L2 so that the three can be aligned with the three heat exchange tubes arranged in sequence again.

[0050] When N is 2, when the first nozzle and the two rows of second nozzles on either side are rinsing the three corresponding heat exchange tubes, there is still one un-aligned heat exchange tube between each pair of adjacent tubes. Therefore, during the movement of the spray device, after the first nozzle and the two rows of second nozzles on either side complete one rinsing operation on the three corresponding heat exchange tubes, they need to be moved by 1 L2 distance to ensure that the first nozzle and the two rows of second nozzles on either side can rinse the two un-rinsed heat exchange tubes and the other corresponding heat exchange tube. Subsequently, the first nozzle and the adjacent rows of second nozzles need to be moved by 5 L2 distances to realign the three heat exchange tubes to be rinsed, and the above operation is repeated.

[0051] In other embodiments, please refer to Figure 3 and Figure 4 All the first nozzles 2 are arranged in two rows along the longitudinal direction of the main tube 1, with a third preset distance L3 between the two rows of first nozzles 2. There is a second preset distance L2 between two adjacent rows of heat exchange tubes in the condenser. L2 and L3 satisfy the condition: L1=L2. The two rows of first nozzles 2 are staggered, and another row of first nozzles 2 is arranged on the vertical line between two adjacent first nozzles 2 in the same row. The center line connecting the three first nozzles 2 forms an equilateral triangle.

[0052] It is understandable that in the condenser heat exchanger tube array to be flushed, adjacent rows of heat exchanger tubes are staggered, and the center line connecting three adjacent heat exchanger tubes in two adjacent rows forms an equilateral triangle. Thus, the two rows of first nozzles 2 provided in this application can be sequentially aligned with adjacent rows of heat exchanger tubes, which helps improve the flushing effect.

[0053] Further, please see Figure 3 and Figure 4 Each of the two rows of first nozzles 2 has a primary spray unit on one side facing away from each other, and all the second nozzles 3 in the two secondary spray units are arranged in a row along the longitudinal direction of the main pipe 1. The two rows of second nozzles 3 have a fourth preset distance L4 and a fifth preset distance L5 between them and the row of first nozzles 2 adjacent to them, respectively. L4 and L5 satisfy the condition: L4=L5.

[0054] Furthermore, please see Figure 3 and Figure 4 In the condenser, there is a second preset distance L2 between two adjacent rows of heat exchange tubes. L2, L4 and L5 satisfy the conditions: L4≥2NL2, L5≥2NL2, and N is a positive integer.

[0055] It is understandable that during the actual operation of the spray device 100, the movement path of the spray device 100 is as follows: first, control the spray device 100 to move (2N-2) / 2 times, and each time move a distance of 2 times L2, then move directly by 2N+2 times the heat exchange tube spacing, and repeat this cycle.

[0056] In some embodiments, see Figure 3 and Figure 4 The spraying device 100 also includes a mounting assembly, which includes a mounting base 6 and a connector 5. The mounting base 6 includes two mounting sections that are intersected and connected to form an L-shaped structure, with the opposite ends of the two mounting sections each connected to the periphery of the main pipe 1. The connector 5 connects the mounting base 6 to each of the second nozzles 3.

[0057] Understandably, this L-shaped structure design ensures a stable connection between the main pipe 1 and the mounting base 6. Furthermore, the open space between the main pipe 1 and the two mounting sections helps reduce the weight of the entire spraying device 100 and lowers material costs. In addition, the open space facilitates subsequent maintenance and repair, allowing personnel to more easily inspect and repair the main pipe 1 and components near the mounting base 6.

[0058] Further, please see Figure 3 and Figure 4The connector 5 includes two connecting segments, which are cross-connected to form an L-shaped structure. One of the two connecting segments is fitted and fixed to one of the two mounting segments, and the other of the two connecting segments is flush with the other of the two mounting segments and is engaged with each of the second nozzles 3.

[0059] By designing the connector 5 as an L-shaped structure, the weight of the spraying device 100 can be reduced, thus lowering material costs. Furthermore, by fitting and fixing the connector 5 and the mounting base 6 together, the contact area between them can be increased, thereby effectively enhancing the stability between the connector 5 and the mounting base 6, reducing the risk of loosening due to vibration and other factors during the operation of the spraying device 100, and ensuring that the entire system can operate continuously and reliably.

[0060] Furthermore, please see Figure 3 and Figure 4 At least one of the mounting base 6 and the connector 5 has a through-hole 7 for weight reduction. The weight reduction hole 7 effectively reduces the weight of the mounting base 6 and the connector 5 without affecting their structural strength, thereby further reducing the weight of the entire spraying device 100 and reducing the amount of material used. The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combination of these technical features does not contradict each other, it should be considered within the scope of this specification.

[0061] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A spraying device for flushing condenser heat exchange tubes, characterized in that, The spraying device includes: Mother tube; A plurality of first nozzles, all of which are fitted onto the main tube and arranged at intervals along the longitudinal direction of the main tube to form at least one column, wherein the distance between two adjacent first nozzles in the same column is equal to the distance between the openings of two adjacent heat exchange tubes in the condenser; and The secondary spray unit is disposed on at least one side of the first nozzle along the circumference of the main pipe; the secondary spray unit includes a branch pipe assembly and a plurality of second nozzles, the branch pipe assembly being connected to the main pipe; all the second nozzles are fitted onto the branch pipe assembly and are arranged at intervals along the longitudinal direction of the main pipe to form at least one row; the spray direction of all the second nozzles is the same as the spray direction of the first nozzle.

2. The spraying device according to claim 1, characterized in that, The branch pipe assembly includes a plurality of branch pipes, all of which are spaced apart from each other on the main pipe along its longitudinal direction; at least one second nozzle is attached to each branch pipe.

3. The spraying device according to claim 1 or 2, characterized in that, All the first nozzles are arranged in a row along the longitudinal direction of the main tube. There is a first preset distance L1 between the first nozzle in the row and the second nozzle in the adjacent row. There is a second preset distance L2 between two adjacent rows of heat exchange tubes in the condenser. L1 and L2 satisfy the condition: L1≥NL2, and N is a positive integer.

4. The spraying device according to claim 3, characterized in that, The first nozzle in the column is provided with a secondary spray unit on each of the opposite sides of the main tube along the circumference, and all the second nozzles in the two secondary spray units are arranged at intervals along the longitudinal direction of the main tube to form a column; the distance between the two columns of second nozzles and the column of first nozzles is equal.

5. The spraying device according to claim 1 or 2, characterized in that, All the first nozzles are arranged in two rows along the longitudinal direction of the main tube, and there is a third preset distance L3 between the two rows of first nozzles. There is a second preset distance L2 between two adjacent rows of heat exchange tubes in the condenser. L2 and L3 satisfy the condition: L1=L2. The two columns of the first nozzles are staggered, and another column of the first nozzles is arranged on the vertical line between two adjacent first nozzles in the same column. The center line connecting the three first nozzles forms an equilateral triangle.

6. The spraying device according to claim 5, characterized in that, Each of the two rows of first nozzles is provided with a secondary injection unit on one side away from each other, and all the second nozzles in the two secondary injection units are arranged in a row along the longitudinal direction of the main tube; the two rows of second nozzles and the adjacent row of first nozzles are respectively provided with a fourth preset distance L4 and a fifth preset distance L5, and L4 and L5 satisfy the condition: L4=L5.

7. The spraying device according to claim 6, characterized in that, The condenser has a second preset spacing L2 between two adjacent rows of heat exchange tubes. L2, L4 and L5 satisfy the conditions: L4≥2NL2, L5≥2NL2, and N is a positive integer.

8. The spraying device according to claim 1, characterized in that, It also includes an installation component, which includes a mounting base and a connector. The mounting base includes two mounting sections that are cross-connected to form an L-shaped structure, and the opposite ends of the two mounting sections are connected to the periphery of the main tube. The connector is connected between the mounting base and each of the second nozzles.

9. The spraying device according to claim 8, characterized in that, The connector includes two connecting segments that are cross-connected to form an L-shaped structure. One of the two connecting segments is fitted and fixed to one of the two mounting segments, and the other of the two connecting segments is flush with the other of the two mounting segments and is mated with each of the second nozzles.

10. The spraying device according to claim 8, characterized in that, At least one of the mounting base and the connector has a through-hole for weight reduction.

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