Matrix assembly type stainless steel water tank

Abstract

The utility model relates to the technical field of water tank manufacturing, in particular to a matrix assembly type stainless steel water tank which comprises tank bodies and flow dividing assemblies, the tank bodies are formed by splicing a plurality of mold pressing plates, the multiple tank bodies are communicated to form the water tank, water inlets are formed in the tops of the tank bodies, and water outlets are formed in the side walls of the water tank; the flow dividing assembly comprises a first partition plate and a plurality of flow dividing parts, the first partition plate is arranged in the distribution direction of the box bodies and is perpendicular to the bottoms of the box bodies, the flow dividing parts are distributed in the arrangement direction of the first partition plate at intervals, and each flow dividing part comprises a second partition plate and two third partition plates; the second partition plate is perpendicular to the first partition plate, a gap is reserved between the second partition plate and the side wall of the box body, the two third partition plates are located on one side of the first partition plate, the third partition plates are parallel to the second partition plate, and the second partition plate and the third partition plates form an S-shaped gap for water to flow through; the device has the effects of further optimizing water flow circulation, optimizing the space of the water tank and guaranteeing good water quality.

Description

Technical Field

[0001] This application relates to the field of water tank manufacturing technology, and in particular to a matrix-assembled stainless steel water tank. Background Technology

[0002] With the acceleration of urbanization and the continuous increase in population density, the stability, safety, and sustainability of urban water supply systems have become crucial issues in modern urban construction. Water supply facilities are essential for the normal operation of a city, affecting not only residents' daily water needs but also industrial production and fire safety. Traditional water supply facilities have become increasingly inadequate to meet the diverse needs of modern cities as they develop.

[0003] In traditional urban water supply systems, the water circulation path within water tanks is often unreasonable, leading to stagnant water areas and uneven water quality. This makes it difficult for disinfectants to distribute evenly, affecting disinfection effectiveness and potentially causing secondary water pollution, thus threatening user safety. Furthermore, the internal structure of the water tanks is often poorly designed, causing localized stress concentrations on the side panels under water flow impact. This can lead to tank deformation and damage, shortening the tank's lifespan and increasing maintenance costs.

[0004] Regarding the aforementioned technologies, although existing technologies have made some improvements to stainless steel water tanks, such as using new materials or optimizing splicing processes, they still cannot fundamentally solve the problems of poor adaptability of water tank space and insufficient water quality assurance. Therefore, it is urgent to develop a new type of stainless steel water tank to meet the requirements of modern cities for high-quality and high-reliability water supply facilities. Utility Model Content

[0005] To overcome the above problems, this application provides a matrix-assembled stainless steel water tank.

[0006] The matrix-assembled stainless steel water tank provided in this application adopts the following technical solution:

[0007] A matrix-assembled stainless steel water tank includes a tank body and a diversion assembly. The tank body is assembled from multiple molded plates, and the multiple tank bodies are connected to form a water tank. The multiple tank bodies are assembled in a stepped shape. A water inlet is provided at the top of the tank body and is connected to the inside of the water tank. A water outlet is provided on the side wall of the water tank and is located near the bottom of the water tank. The water inlet and the water outlet are used for the inflow and outflow of water and are arranged diagonally.

[0008] The diversion assembly is located inside the water tank. The diversion assembly includes a first baffle and multiple diversion components. The first baffle is arranged along the distribution direction of the multiple tank bodies and is perpendicular to the bottom of the tank body. The first baffle is connected to the tank body. The multiple diversion components are distributed at intervals along the arrangement direction of the first baffle. Each diversion component includes a second baffle and two third baffles. The second baffle passes through the first baffle and is perpendicular to the first baffle. The second baffle is connected to the first baffle and its bottom is connected to the bottom of the water tank. A gap is left between the second baffle and the side wall of the tank body. The two third baffles are each located on one side of the first baffle and are parallel to the second baffle. The third baffles are connected to the tank body and a gap is left between the third baffle and the first baffle. The second baffle and the third baffle form an "S"-shaped gap through which water flows.

[0009] By adopting the above technical solutions, the tank body, which is spliced ​​from multiple molded plates, ensures the strength and sealing of the water tank. The multiple tank bodies are spliced ​​into a stepped shape, which can be customized according to the building space structure. The inlet and outlet are arranged diagonally, which can force the water flow to form a long-distance circulation path, avoid water stagnation areas, and ensure that the water in the tank is fully circulated and renewed. The second and third baffles of the diversion component form an "S"-shaped gap, which allows the water flow to flow in an "S" shape in the water tank, further optimizing the water flow circulation, optimizing the water tank space, and ensuring good water quality.

[0010] In one specific implementation scheme, both the second partition and the third partition are connected to the side wall of the box by bracing.

[0011] By adopting the above technical solution, the connection strength between the baffle and the tank is enhanced, the impact force during water inflow is better dispersed, and the tank deformation caused by uneven stress on the baffle is avoided.

[0012] In one specific implementation scheme, the side wall of the tank is provided with a vent, an overflow port, a level gauge interface, and a drain port. The overflow port is close to the top of the tank, the level gauge interface is located at the top of the water tank for installing a level gauge, and the drain port is located at the bottom of the water tank.

[0013] By adopting the above technical solutions, the vent ensures pressure balance inside and outside the water tank, the overflow outlet drains excess water when the water level is too high, preventing damage from overflow, the level gauge interface facilitates the installation of a level gauge to observe the water level, and the drain outlet removes impurities and wastewater. Combined with a water tank formed by multiple molded plates connected in a stepped manner, and diagonally arranged inlet and outlet ports, along with a diversion component forming an "S"-shaped gap, the water tank possesses multiple practical functions, better fulfilling its functions of water storage, drainage, and monitoring, achieving orderly water flow and circulation, and improving the overall performance and practicality of the water tank.

[0014] In one specific implementation scheme, a pressure-reducing platform is provided below the water inlet. The pressure-reducing platform is made of stainless steel plate and has evenly distributed through holes on its surface. The pressure-reducing platform is fixed to the bottom plate of the tank by four vertical support pipes.

[0015] By adopting the above technical solution, a pressure-reducing platform is set below the water inlet. This platform is made of a stainless steel plate with evenly distributed through holes and is fixed to the bottom plate of the tank by four vertical support pipes. This platform can reduce pressure. When water rushes down from the water inlet at high speed, the water flow is dispersed through the through holes, reducing the impact force on the bottom plate of the water tank.

[0016] In one specific feasible implementation, each of the ventilation openings is equipped with a stainless steel insect-proof net.

[0017] By adopting the above technical solution, insects and other debris can be prevented from entering the water tank, ensuring a hygienic environment inside the water tank.

[0018] In one specific implementation scheme, a baffle is provided at the corner of the box, the baffle is fixed at an angle between the side plate and the partition, and the top of the baffle is flush with the inner wall of the box.

[0019] By adopting the above technical solutions, the water circulation path in the water tank can be optimized, the water flow can be guided smoothly through corners, the water flow resistance can be reduced, the water stagnation area can be avoided, the water flow in the water tank can be improved, the disinfection effect can be enhanced, and the water quality can be ensured to be uniform.

[0020] In one specific implementation scheme, a fixing component is also included, which is a cross-shaped support frame connected to the top of the box. The support frame is composed of four I-beams welded together along the center lines of the length and width of the box. The support frame is connected to the top plate of the box through multiple elastic gaskets.

[0021] By adopting the above technical solutions, the cross-shaped support frame can provide strong support for the top plate of the box, preventing the top plate from sagging and deforming due to its own weight or external pressure; the elastic gasket can buffer the force between the support frame and the top plate, reduce vibration and noise, and adapt to certain thermal expansion and contraction changes.

[0022] In one specific implementation scheme, an annular reinforcing ring is provided inside the box, and the reinforcing ring is arranged at equal intervals along the side wall of the box.

[0023] By adopting the above technical solutions, the overall structural performance of the tank can be enhanced, and the pressure resistance of the water tank can be improved.

[0024] In summary, this application includes at least one of the following beneficial technical effects:

[0025] 1. The designed matrix-assembled stainless steel water tank features multiple molded panels that ensure its strength and sealing. The stepped arrangement of these panels allows for customized layouts based on building space. The diagonal arrangement of the inlet and outlet forces water to form a long circulation path, preventing water stagnation and ensuring thorough circulation and renewal. The second and third baffles of the diversion assembly form an "S"-shaped gap, allowing water to flow in an "S" shape within the tank, further optimizing water circulation, tank space, and ensuring good water quality.

[0026] 2. The designed matrix-assembled stainless steel water tank enhances the connection strength between the baffle and the tank body, better disperses the impact force during water intake, and avoids deformation of the water tank caused by uneven stress on the baffle.

[0027] 3. The designed matrix-assembled stainless steel water tank optimizes the water circulation path within the tank, guides the water flow smoothly through corners, reduces water flow resistance, avoids water stagnation areas, improves the fluidity of the water within the tank, enhances the disinfection effect, and ensures uniform water quality. Attached Figure Description

[0028] Figure 1 This is a structural schematic diagram from a first perspective in an embodiment of this application.

[0029] Figure 2 yes Figure 1 A magnified view of A in the middle.

[0030] Figure 3 This is a structural schematic diagram from the second perspective in this embodiment.

[0031] Figure 4 This is a schematic diagram of the splitter component in this embodiment.

[0032] Figure 5 This is a cross-sectional view of the box in this embodiment.

[0033] Explanation of reference numerals in the attached drawings: 1. Box body; 11. Molded plate; 12. Bracket; 13. Vent; 14. Stainless steel insect screen; 15. Overflow port; 16. Manhole; 17. Ladder; 18. Guide plate; 19. Reinforcing ring; 2. Diverting assembly; 21. First partition; 22. Diverting component; 221. Second partition; 222. Third partition; 23. Tie rod; 24. Pressure reducing platform; 241. Support pipe; 3. Fixing assembly. Detailed Implementation

[0034] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0035] This application discloses a matrix-assembled stainless steel water tank.

[0036] Example 1

[0037] Reference Figure 1 A matrix-assembled stainless steel water tank includes a tank body 1.

[0038] Reference Figure 1 The housing 1 is assembled from multiple molded plates 11. The molded plates 11 typically come in sizes such as 1000×1000 or 1000×500 mm. They are made of SUS304 stainless steel, a material known for its excellent corrosion resistance and hygienic safety, effectively preventing secondary water pollution. The molded plates 11 are manufactured using a suitable cold-stamping process, resulting in significantly increased yield strength compared to unstamped stainless steel plates. During assembly, adjacent molded plates 11 are fixedly connected by welding, ensuring no leaks between them and achieving a high pressure resistance rating. Multiple housings 1 are connected in a continuous manner. The water tank consists of multiple tanks 1, which can be customized according to the building space structure. In this embodiment, the multiple tanks 1 are spliced ​​into a stepped shape. The outer wall of the tank 1 is wrapped with a composite insulation layer, which includes an inner polyurethane foam layer and an outer stainless steel cladding. The polyurethane foam layer has good insulation performance, which can effectively reduce the loss of water temperature in the water tank and reduce energy consumption. The outer stainless steel cladding can protect the polyurethane foam layer and prevent it from being damaged and corroded by the outside. During installation, the polyurethane foam material is first sprayed onto the outer wall of the tank 1 to form a foam layer of a certain thickness. Then, the stainless steel cladding is covered on the outside of the foam layer and fixed.

[0039] Reference Figure 1The bottom of the tank body 1 is equipped with a bracket 12, which is made of 10# cold-dip galvanized channel steel. The channel steel has high strength and stability, and the cold galvanizing treatment can improve its corrosion resistance. The bracket 12 is installed at the bottom of the tank body 1, in contact with the ground, and bears the weight of the entire water tank. The bracket 12 can be fixed to the bottom of the tank body 1 by welding or bolts to ensure a tight connection. Other steel materials such as I-beams can also be used as the bracket 12, as long as they can meet the support strength requirements.

[0040] Reference Figure 1 , Figure 2 and Figure 3 The tank body 1 has a vent 13 on its top, which connects to the inside of the water tank. The vent 13 is used for air circulation to ensure pressure balance inside and outside the water tank. The vent 13 can be a round or square pipe, installed at different heights on the side wall of the tank body 1. A stainless steel insect screen 14 is installed at the vent 13 to prevent insects and other debris from entering the water tank, ensuring a hygienic environment inside. The tank body 1 also has a water inlet on its top, which connects to the inside of the water tank. A water inlet pipe is installed at the water inlet and connected to a water source. The water tank has an outlet on its side wall, near the bottom. An outlet pipe is installed at the outlet, and an outlet valve is fixedly connected to the outlet pipe via a flange. The water inlet and outlet are used for water inflow and outflow. The water inlet and outlet are arranged diagonally, which forces the water flow to form a long-distance circulation path, such as an "S" shaped flow, avoiding water stagnation areas. This design ensures thorough circulation and renewal of the water in the tank. An overflow port 15 is located on the side wall of the tank body 1, near the top. The overflow port 15 discharges excess water when the water level is too high, preventing overflow and damage. A level gauge interface is located on the top of the tank for installing a level gauge, facilitating observation of the water level. The appropriate installation height for the level gauge interface can be selected based on the type of level gauge. A drain port is located at the bottom of the tank, with a drain pipe connected to a drain valve via a flange. The drain port is used to discharge impurities and wastewater from the tank. A manhole 16 is located on the top of the tank body 1, allowing maintenance personnel to enter and exit the tank for inspection and maintenance. The manhole 16 is equipped with a sealed manhole cover to prevent debris from entering the tank. A ladder 17 is located on the side wall of the tank, secured with reinforcing bolts, allowing maintenance personnel to easily climb to higher parts of the tank.

[0041] Reference Figure 4A matrix-assembled stainless steel water tank also includes a diversion assembly 2, which is mounted on the tank body 1 and located inside the water tank. The diversion assembly 2 includes a first partition 21 and multiple diversion components 22. The first partition 21 is arranged along the distribution direction of the multiple tank bodies 1 and is perpendicular to the bottom of the tank body 1. The first partition 21 is fixed to the tank body 1 by screws. The multiple diversion components 22 are distributed at intervals along the setting direction of the first partition 21. Each diversion component 22 includes a second partition 221 and two third partitions 222. The second partition 221 passes through the first partition 21 and is perpendicular to the first partition 21. 21 is welded to the first partition 21, and the bottom of the second partition 221 is welded to the bottom of the water tank. There is a gap between the second partition 221 and the side wall of the tank body 1. Two third partitions 222 are located on one side of the first partition 21. The third partitions 222 and the second partition 221 are arranged parallel to each other. The third partitions 222 are welded to the tank body 1. There is a gap between the third partitions 222 and the first partition 21. The second partition 221 and the third partition 222 form an "S" shaped gap, which allows the water to flow in an "S" shape in the water tank. The first partition 21, the second partition 221 and the third partition 222 are all made of SUS304 stainless steel, and the thickness varies depending on the position.

[0042] Reference Figure 4 The partition and the tank body 1 are connected by a tie rod 23 welded together. The tie rod 23 is formed by bending a stainless steel plate at a 90-degree angle, and its material is the same as that of the main body of the water tank. One end of the tie rod 23 is welded and fixed to the inner side of the partition, and the other end is welded and fixed to the side plate of the tank body 1, which enhances the connection strength between the partition and the tank body 1. The tie rod 23 adopts a double-sided four-claw structure, with the bent corner of the tie rod 23 extending towards the water inlet of the tank body 1. This structure can better disperse the impact force when water enters, avoiding uneven stress on the partition and thus preventing deformation of the water tank. When water enters the water tank from the inlet, the tie rod 23 can transfer the impact force to other parts of the tank body 1, reducing the pressure on the partition. In some special cases, if the impact force at the water inlet is very large, the number of tie rods 23 can be increased or thicker tie rods 23 can be used to enhance the impact resistance of the water tank.

[0043] Reference Figure 4 and Figure 5A pressure-reducing platform 24 is installed below the water inlet. The pressure-reducing platform 24 is made of stainless steel plate with evenly distributed through holes on its surface. The pressure-reducing platform 24 is fixed to the bottom plate of the tank body 1 by four vertical support pipes 241 and connected to the side plates of the tank body 1 by multiple sets of tie rods 23. A figure-eight shaped stabilizing bracket is installed at the end of the pressure-reducing platform 24 corresponding to the water inlet. The stabilizing bracket consists of eight tie rods 23, with both ends of the tie rods 23 welded and fixed to the bottom and top plates of the tank body 1, respectively, and welded to the lower surface of the pressure-reducing platform 24. The pressure-reducing platform 24 is made of stainless steel plate with a length of 1500mm, a width of 1500mm, and a thickness of 2.5mm, with evenly distributed holes on its surface. This design can achieve pressure reduction. When water rushes down at high speed from the inlet, the flow is dispersed through the through-holes, reducing the impact on the tank's bottom plate. The vertical support pipe 241, made of DN100 304 stainless steel, provides robust support for the pressure-reducing platform 24. The eight tie rods 23 of the stabilizing bracket further reinforce the pressure-reducing platform 24, enabling it to withstand greater impact forces. The side plates near the inlet need to withstand greater pressure, therefore, thicker 3.0mm plates are used to enhance their compressive strength. As the distance from the inlet increases, the impact force on the side plates gradually decreases, so the side plate thickness gradually decreases. This ensures the overall strength of the tank while reasonably saving material costs. In practical use, it can better adapt to the internal pressure distribution of the tank, improving its stability and economy.

[0044] The implementation principle of Example 1 is as follows: This matrix-assembled stainless steel water tank, through the rational design and combination of its components, fully leverages the advantages of stainless steel. The tank body 1, spliced ​​with molded plates 11, ensures the strength and sealing of the water tank. The bracket 12 provides stable support. Various interfaces and components meet the functional requirements of the water tank. Vertical partitions and tie rods 23 reinforce the water tank structure. Compared with traditional water tanks, it has better corrosion resistance, spatial adaptability, and construction efficiency. It can effectively avoid secondary water pollution, improve the stability and safety of urban water supply systems, and meet the high-quality requirements of modern cities for water supply facilities. The side plate thickness is rationally adjusted according to the stress conditions at different locations inside the water tank, achieving optimized material utilization. While ensuring the water tank meets usage requirements, material costs are reduced, and the cost-effectiveness of the water tank is improved. Compared with the uniform side plate thickness design of traditional water tanks, this differentiated design is more scientific and reasonable, better adapting to actual working conditions, reducing problems such as side plate damage caused by excessive local pressure, and improving the reliability and service life of the water tank.

[0045] Example 2

[0046] Reference Figure 4The difference between this embodiment and Embodiment 1 is that a guide plate 18 is provided at the corner of the tank 1. The guide plate 18 is fixed at an angle between the side plate and the partition plate. The top of the guide plate 18 is flush with the inner wall of the tank 1, and the bottom extends downward to a height of 100-200mm from the bottom plate of the tank 1. The guide plate 18 optimizes the water circulation path in the tank. When water flows in the tank, eddies and short-circuit phenomena are easily formed at corners. The guide plate 18 can guide the water flow smoothly through the corners, reduce water resistance, and make the water flow form a more reasonable "S" shaped flow path, avoiding the formation of water stagnation areas. This can improve the fluidity of the water in the tank, enhance the disinfection effect, and ensure uniform water quality. The guide plate 18 is generally made of stainless steel, which matches the material of the water tank and has good corrosion resistance. Its tilt angle and installation position can be adjusted according to the specific size of the water tank and the water flow conditions to achieve the best guiding effect.

[0047] Reference Figure 4 A matrix-assembled stainless steel water tank also includes a fixing component 3, which is a cross-shaped support frame located at the top of the tank body 1. The support frame is formed by four I-beams welded together along the center lines of the length and width of the tank body 1. The support frame is connected to the top plate of the tank body 1 by multiple elastic gaskets. An annular reinforcing ring 19 is provided inside the tank body 1. The reinforcing rings 19 are arranged at equal intervals along the side wall of the tank body 1. The reinforcing rings 19 are formed by bending stainless steel profiles and are fully welded to the side plate of the tank body 1. The distance between adjacent reinforcing rings 19 is 1.5m.

[0048] Reference Figure 4 The cross-shaped support frame uses I-beams, which have high strength and rigidity. The frame structure, formed by cross-welding, provides strong support for the top plate of tank 1, preventing it from sagging or deforming due to its own weight or external pressure. Elastic gaskets buffer the force between the support frame and the top plate, reducing vibration and noise, while also accommodating thermal expansion and contraction. Annular reinforcing rings 19 are evenly spaced along the side walls of tank 1, enhancing the overall structural performance of tank 1 and improving the water tank's pressure resistance.

[0049] The implementation principle of Example 2 is as follows: A guide plate 18 is installed at the corner of the tank 1, which effectively improves the water flow in the tank. By guiding the water flow, short-circuiting is reduced, allowing the water to circulate fully within the tank and avoiding water quality deterioration caused by water stagnation. Simultaneously, it facilitates the uniform distribution of disinfectant in the water, enhancing the disinfection effect, improving the water supply quality, and enhancing the overall performance of the tank, thus meeting the water quality requirements of modern urban water supply facilities. A cross-shaped support frame and elastic gaskets are installed on the top of the tank 1 to protect the top plate and improve the structural stability of the tank. The annular reinforcing ring 19 enhances the pressure resistance of the tank 1, enabling it to withstand greater pressure. These optimized designs comprehensively improve the performance and applicability of the water tank, making it more suitable for the needs of modern urban water supply systems.

[0050] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A matrix-assembled stainless steel water tank, characterized in that: It includes a housing (1) and a diversion assembly (2). The housing (1) is assembled from multiple molded plates (11). Multiple housings (1) are connected to form a water tank. Multiple housings (1) are assembled into a stepped shape. The top of the housing (1) is provided with a water inlet that is connected to the inside of the water tank. The side wall of the water tank is provided with a water outlet that is close to the bottom of the water tank. The water inlet and the water outlet are used for the inflow and outflow of water. The water inlet and the water outlet are arranged diagonally. The diversion assembly (2) is located inside the water tank. The diversion assembly (2) includes a first partition (21) and multiple diversion components (22). The first partition (21) is arranged along the distribution direction of the multiple tank bodies (1) and is perpendicular to the bottom of the tank body (1). The first partition (21) is connected to the tank body (1). The multiple diversion components (22) are spaced apart along the arrangement direction of the first partition (21). Each diversion component (22) includes a second partition (221) and two third partitions (222). The second partition (221) passes through the first partition (21). The second partition (221) and the first partition... (21) Vertically arranged, the second partition (221) is connected to the first partition (21), the bottom of the second partition (221) is connected to the bottom of the water tank, and there is a gap between the second partition (221) and the side wall of the tank body (1). The two third partitions (222) are each located on one side of the first partition (21). The third partitions (222) are arranged parallel to the second partitions (221). The third partitions (222) are connected to the tank body (1). There is a gap between the third partitions (222) and the first partition (21). The second partition (221) and the third partitions (222) form an "S" shaped gap through which water flows.

2. The matrix-assembled stainless steel water tank according to claim 1, characterized in that: The second partition (221) and the third partition (222) are both connected to the side wall of the box (1) by tie rods (23).

3. The matrix-assembled stainless steel water tank according to claim 1, characterized in that: The side wall of the box (1) is provided with a vent (13), an overflow port (15), a level gauge interface and a drain port. The overflow port (15) is close to the top of the box (1), the level gauge interface is located at the top of the water tank and is used to install the level gauge, and the drain port is located at the bottom of the water tank.

4. A matrix-assembled stainless steel water tank according to claim 1, characterized in that: A pressure-reducing platform (24) is provided below the water inlet. The pressure-reducing platform (24) is made of stainless steel plate and has uniformly distributed through holes on its surface. The pressure-reducing platform (24) is fixed to the bottom plate of the box body (1) by four vertical support pipes (241).

5. A matrix-assembled stainless steel water tank according to claim 3, characterized in that: Each of the ventilation openings (13) is equipped with a stainless steel insect-proof net (14).

6. A matrix-assembled stainless steel water tank according to claim 1, characterized in that: A guide plate (18) is provided at the corner of the box (1). The guide plate (18) is fixed in an inclined position between the side plate and the partition. The top of the guide plate (18) is flush with the inner wall of the box (1).

7. A matrix-assembled stainless steel water tank according to claim 6, characterized in that: It also includes a fixing component (3), which is a cross-shaped support frame connected to the top of the box (1). The support frame is formed by welding four I-beams along the center lines of the length and width of the box (1). The support frame is connected to the top plate of the box (1) by multiple elastic gaskets.

8. A matrix-assembled stainless steel water tank according to claim 1, characterized in that: The box (1) is provided with an annular reinforcing ring (19), which is arranged at equal intervals along the side wall of the box (1).

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