A siphon filter with automatic control function

Abstract

The utility model relates to siphon filter field, and disclose a kind of siphon filter with automatic control function, including water inlet tank, treatment water tank, water outlet tank and siphon pipe, filter mechanism and variable speed mechanism are equipped in treatment water tank, filter mechanism is composed of filter head, filter plate, and cross-shaped outlet hole is set in filter head top, and high-efficiency filtration and backwash are realized in cooperation filter plate;Variable speed mechanism drives gear set through turntable handle, drives water distribution plate rotation, and its outer circular arc surface equidistantly arranged triangular weir realizes uniform water distribution, solves the problem that traditional fixed weir water distribution is uneven, siphon pipe is cooperated with water outlet tank, when filter layer resistance reaches threshold value, automatically triggers siphon effect, completes backwash process, without manual intervention, the utility model realizes water distribution uniformity regulation and backwash automation by mechanical structure innovation, significantly improves filtration efficiency, reduces water resource waste, applicable to municipal water supply, industrial water treatment and other fields, with advantages such as stable structure, easy maintenance etc.

Description

Technical Field

[0001] This utility model relates to the field of siphon filter, specifically a siphon filter with automatic control function. Background Technology

[0002] In the field of water treatment, with the improvement of water quality standards and the increasing demand for unmanned operation and maintenance, the traditional siphon filter, which relies on manual observation of liquid level and manual adjustment of valves, can no longer meet the requirements of efficient and stable operation. Manual operation has problems such as slow response and poor water distribution uniformity. Especially under conditions of water quality fluctuation or high flow rate, it is easy to lead to a decrease in filtration efficiency or waste of water resources. Therefore, the development of siphon filter with automatic control function has become a key direction for improving the intelligence of water treatment system and reducing labor costs.

[0003] Traditional siphon filters often use fixed weirs for water distribution. Due to the uniform weir height, the water flow distribution is uneven, which can easily lead to excessive local load on the filter, reducing filtration efficiency and shortening the service life of the filter media. In addition, the backwashing process relies on manual observation of the liquid level or timed control, which carries the risk of untimely or excessive backwashing: untimely backwashing will lead to increased filter layer clogging and affect the quality of the effluent; while excessive backwashing will waste water resources and accelerate the wear of the filter media. To address this, we propose a siphon filter with automatic control function. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this invention provides a siphon filter with automatic control function, thus solving the aforementioned problems.

[0006] (II) Technical Solution

[0007] To achieve the above-mentioned objectives, the present invention provides the following technical solution: a siphon filter with automatic control function, comprising an inlet tank, an inlet pipe, a treatment tank, and an outlet tank. The inlet pipe is fixedly installed on the bottom surface of the inlet tank, and the other end of the inlet pipe is connected to the interior of the treatment tank. The outlet tank is fixedly installed on the bottom side of the treatment tank away from the inlet tank. A filtration mechanism is installed near the bottom of the treatment water tank, a speed change mechanism is installed above the filtration mechanism, and a water distribution plate is fixedly installed below the speed change mechanism. A siphon pipe is fixedly installed inside the treatment tank, and the outlet of the other end of the siphon pipe is located above the outlet tank.

[0008] Preferably, the filtration mechanism includes a filter head and a filter plate. A metal disc is fixedly installed inside the water treatment tank near the bottom, and filter heads are fixedly installed on the metal disc at equal intervals. A filter plate is fixedly installed inside the water treatment tank above the filter heads, and a dense filter screen is provided on the filter plate.

[0009] Preferably, the filter head has water outlet holes in a cross shape.

[0010] Preferably, the speed change mechanism includes a housing, a support plate, a small gear, and a large gear. The housing is fixedly installed on the inner top surface of the water treatment tank, and the support plates are symmetrically fixedly installed on the inner walls of both sides of the housing. A large gear is rotatably connected between a set of support plates, and a small gear is rotatably connected below the large gear. The small gear and the large gear are coaxially fixedly connected.

[0011] Preferably, the transmission mechanism further includes a turntable handle, a second small gear, a second large gear, and a rotating shaft fixedly installed between the remaining set of support plates. The second small gear is rotatably connected to the rotating shaft, and the second small gear meshes with the first large gear. The second large gear is also rotatably connected inside the rotating shaft on the support plate, and the second large gear meshes with the first small gear. A turntable handle is rotatably connected to the outer wall of the set of support plates. A connecting shaft is fixedly installed on the turntable handle. The connecting shaft on the turntable handle is coaxially fixedly connected to the second small gear and slidably connected to the rotating shaft on the support plate. The turntable handle protrudes from the top surface of the treatment tank.

[0012] Preferably, the large gear two faces the small gear two with a circumferential array of limiting posts, and the limiting posts are engaged with the tooth pitch on the small gear two.

[0013] Preferably, a water distribution plate is coaxially fixedly connected to the lower part of the small gear; Triangular weirs are equidistantly spaced on the outer arc surface of the water distribution plate.

[0014] Preferably, the bracket has a triangular structure, and a snap-fit ​​fixing block is fixedly installed on the top surface of the bracket, and the snap-fit ​​fixing block has an arc groove. The arc groove of the snap-fit ​​fixing block is fixed to the outer arc surface of the siphon tube.

[0015] (III) Beneficial Effects

[0016] Compared with the prior art, the present invention provides a siphon filter with automatic control function, which has the following beneficial effects: 1. This siphon filter with automatic control function controls the rotation of the water distribution plate by driving the speed change mechanism through the turntable handle, so that the triangular weir on the outer arc surface of the water distribution plate distributes water evenly. This solves the problem of uneven water distribution in traditional fixed water distribution weirs, improves the uniformity of water distribution and filtration efficiency, and the speed of the water distribution plate can be adjusted by the gear transmission ratio to adapt to different working conditions.

[0017] 2. This siphon filter with automatic control function uses a siphon pipe in conjunction with the outlet tank to automatically form a siphon when the filter layer resistance increases to a set threshold, triggering the backwashing process. The water flows in the opposite direction through the filter head to clean the filter layer. There is no need for manual observation of the liquid level or timed operation, which realizes the automatic control of backwashing, reduces manual intervention and avoids the problems of untimely or excessive backwashing. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a cross-sectional view of the present invention; Figure 3 This is a schematic diagram of the filter head assembly of this utility model; Figure 4 This is a schematic diagram of the speed change mechanism of this utility model.

[0019] In the diagram: 1. Inlet tank; 2. Inlet pipe; 3. Treatment tank; 4. Turntable handle; 5. Siphon pipe; 6. Bracket; 7. Outlet tank; 8. Snap-fit ​​block; 9. Filter head; 10. Outlet hole; 11. Filter plate; 12. Distribution tray; 13. Triangular weir; 14. Outer shell; 15. Small gear one; 16. Large gear one; 17. Small gear two; 18. Large gear two; 19. Support plate; 20. Limiting post. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Please see Figure 1-4 A siphon filter with automatic control function includes an inlet tank 1, an inlet pipe 2, a treatment tank 3, and an outlet tank 7. The inlet pipe 2 is fixedly installed on the bottom surface of the inlet tank 1, and the other end of the inlet pipe 2 is connected to the inside of the treatment tank 3. The outlet tank 7 is fixedly installed on the bottom side of the treatment tank 3 away from the inlet tank 1. A filter mechanism is installed near the bottom inside the water treatment tank 3. A speed change mechanism is installed above the filter mechanism, and a water distribution plate 12 is fixedly installed below the speed change mechanism. A siphon pipe 5 is fixedly installed inside the treatment tank 3, and the outlet of the other end of the siphon pipe 5 is located above the outlet tank 7.

[0022] Furthermore, the filtration mechanism includes filter heads 9 and filter plates 11. A metal disc is fixedly installed near the bottom inside the treatment tank 3, and filter heads 9 are fixedly installed at equal intervals on the metal disc. Filter plates 11 are fixedly installed inside the treatment tank 3 above the filter heads 9. The filter plates 11 have dense filter screens. The metal disc serves as the mounting base for the filter heads 9, providing a uniform support layout to ensure consistent spacing between the filter heads 9 and prevent short-circuiting of water flow. The dense filter screens of the filter plates 11 not only carry the filter media and trap large particles of impurities through pore size sieving, forming a double-layer filtration barrier with the filter heads 9, but also buffer the water flow impact during backwashing to prevent the filter media from being violently disturbed and lost. At the same time, they help disperse the backwash water flow and improve the uniformity of cleaning.

[0023] Furthermore, the filter head 9 is provided with water outlet holes 10, which are cross-shaped. The cross-shaped design of the water outlet holes 10 increases the water flow area. At the same time, the cross structure creates water turbulence. On the one hand, during filtration, the water can adsorb small particles through the inner wall of the channel, improving the interception capacity. On the other hand, during backwashing, the water flow generates a rotating impact through the cross channel, which enhances the removal effect on impurities on the inner wall of the filter head 9 and the surface of the filter media, reducing the risk of clogging. In addition, this structure can limit the entry of filter media particles into the interior of the filter head 9, avoiding the loss of filter media and the resulting decrease in filtration performance.

[0024] Furthermore, the transmission mechanism includes a housing 14, a support plate 19, a pinion 15, and a large gear 16. The housing 14 is fixedly installed on the inner top surface of the water treatment tank 3. Support plates 19 are symmetrically fixedly installed on the inner walls of both sides of the housing 14. A large gear 16 is rotatably connected between a set of support plates 19. A pinion 15 is rotatably connected below the large gear 16. The pinion 15 and the large gear 16 are coaxially fixedly connected. The housing 14 adopts a closed structure, which can isolate the water flow in the water treatment tank 3, prevent water vapor from corroding the gear assembly, and extend the mechanical life.

[0025] Furthermore, the transmission mechanism also includes a turntable handle 4, a pinion gear 17, a large gear 18, and a rotating shaft fixedly installed between the remaining set of support plates 19. The pinion gear 17 is rotatably connected to the rotating shaft, and the pinion gear 17 meshes with the large gear 16. The large gear 18 is also rotatably connected inside the rotating shaft on the support plate 19, and the large gear 18 meshes with the pinion gear 15. The turntable handle 4 is rotatably connected to the outer wall of the set of support plates 19. A connecting shaft is fixedly installed on the turntable handle 4. The connecting shaft on the turntable handle 4 is coaxially fixedly connected to the pinion gear 17 and slidably connected to the rotating shaft on the support plate 19. The turntable handle 4 protrudes from the top surface of the water treatment tank 3.

[0026] Furthermore, the large gear 18 facing the small gear 17 has a circular array of limiting posts 20, and the limiting posts 20 are engaged with the tooth pitch on the small gear 17. Furthermore, a water distribution plate 12 is coaxially fixedly connected to the lower part of the small gear 15; Triangular weirs 13 are equidistantly distributed on the outer arc surface of the water distribution plate 12. The equidistant distribution of the triangular weirs 13 ensures that the flow rate of each weir is consistent. In conjunction with the rotational movement of the water distribution plate 12, the incoming water can be cut into a uniform water curtain to cover the entire surface of the filter media layer.

[0027] Furthermore, the bracket 6 has a triangular structure, and a snap-fit ​​fixing block 8 is fixedly installed on the top surface of the bracket 6. The snap-fit ​​fixing block 8 has an arc groove. The arc groove of the snap-fit ​​fixing block 8 is fixed to the outer arc surface of the siphon tube 5.

[0028] Structural Description: Water inlet tank 1: Water inlet tank 1 is the water inlet storage structure of the siphon filter. It is box-shaped and located on the top of one side of the filter. It is connected to the treatment water tank 3 through the water inlet pipe 2 fixed on the bottom. It is used to temporarily store the water to be filtered and provide a stable water source for the entire filtration process. It is the starting point for water to enter the filter. Water inlet pipe 2: Water inlet pipe 2 is a water supply pipe that connects water inlet tank 1 and treatment water tank 3. One end is fixed to the bottom of water inlet tank 1, and the other end extends into the interior of treatment water tank 3 to ensure smooth water flow. It introduces water from water inlet tank 1 into treatment water tank 3 for filtration and is a key channel for water flow transmission. Treatment tank 3: Treatment tank 3 is the core treatment unit of the siphon filter. It has a large box structure and is equipped with components such as a filtration mechanism, a speed change mechanism and a water distribution plate 12. It is used to carry out the core processes such as filtration and water distribution. Its bottom side is fixedly connected to the outlet tank 7, which is the main place for water filtration and purification. Turntable handle 4: Turntable handle 4 is the manual control component of the speed change mechanism. It protrudes from the top surface of the water treatment tank 3 and is coaxially fixed with the small gear 17 via a connecting shaft. Turning the handle can drive the gear set transmission, thereby adjusting the speed of the water distribution plate 12 and realizing manual control of the water distribution speed. It is a key device for human-machine interaction adjustment of water distribution. Siphon pipe 5: Siphon pipe 5 is the key pipe for realizing the siphon effect. One end is located in the treatment tank 3, and the outlet of the other end is higher than the outlet tank 7. It is fixed by the bracket 6 and the snap-fit ​​fixing block 8. It automatically completes the switching between filtration and backwashing processes using the siphon principle without manual intervention, ensuring automatic circulation of water flow. Support 6: Support 6 has a triangular structure, which is very stable. The top surface is equipped with a snap-fit ​​fixing block 8 to fix the siphon tube 5. The arc groove of the snap-fit ​​fixing block 8 fits and fixes the siphon tube 5 to the outer arc surface, providing reliable support for the siphon tube 5 and ensuring its stable position during the siphon process. Outlet tank 7: The outlet tank 7 is located at the bottom of the treatment tank 3 on the side opposite to the inlet tank 1. It is used to receive the backwash wastewater or filtered clean water discharged from the siphon pipe 5. It is the channel for water to flow out of the filter. Its position design ensures that the backwash wastewater can be discharged smoothly, and at the same time, it is convenient to collect the filtered clean water. Snap-fit ​​fixing block 8: The top surface of the snap-fit ​​fixing block 8 is provided with an arc groove, which is installed on the top surface of the bracket 6. The groove fits tightly with the outer arc surface of the siphon tube 5. The siphon tube 5 is fixed on the bracket 6 by snap-fit. The structure is simple and the fixing is firm, ensuring that the siphon tube 5 will not shake or shift during operation. Filter head 9: Filter head 9 is a key component of the filtration mechanism. It is fixed at equal intervals on the metal plate inside the water treatment tank 3, and corresponds to the filter plate 11 above it. It has cross-shaped water outlet holes 10 on its top. During filtration, water flow is allowed to pass through and impurities are intercepted. During backwashing, water flow is reversed to clean the filter layer. It is a two-way channel for filtration and backwashing. Water outlet 10: The water outlet 10 is located at the top of the filter head 9 and is opened in a cross shape. During filtration, it can effectively intercept impurity particles to ensure the quality of the output water. During backwashing, it facilitates the reverse flow of water to impact the filter head, remove the trapped pollutants, improve the backwashing effect, and ensure the filter head is unobstructed. Filter plate 11: The filter plate 11 is fixed above the filter head 9 inside the water treatment tank 3. The plate body has a dense filter screen, which works with the filter head 9 to form a filter layer. It is used to carry the filter media and further filter impurities in the water. Its dense filter screen structure can effectively trap fine particles and improve the filtration accuracy. It is an important barrier to ensure the quality of the effluent. Water distribution plate 12: The water distribution plate 12 is located below the speed change mechanism. It is circular in shape and has triangular weirs 13 equidistantly opened on the outer arc surface. It is driven to rotate by a small gear 15 on the same axis, so that the water flow is evenly divided and sprinkled onto the filter media layer. It solves the problem of uneven water distribution of traditional fixed weirs and is the core component for achieving uniform water distribution and improving filtration efficiency. Triangular weir 13: Triangular weir 13 is equidistantly opened on the outer arc surface of water distribution plate 12, in the shape of a triangular notch. When water distribution plate 12 rotates, triangular weir 13 cuts the water flow evenly, so that the water flow is evenly distributed to the filter media layer at a constant speed, avoiding local impact, ensuring uniform water distribution, and thus optimizing the filtration effect. Outer shell 14: The outer shell 14 is fixed to the top surface inside the treatment water tank 3 and has a closed cavity structure. The support plates 19 are symmetrically installed inside to accommodate the gear assembly of the transmission mechanism, provide installation support for the pinion gear 15, the large gear 16, etc., and protect the gear transmission components to prevent water erosion from affecting the transmission performance. Small gear 15: Small gear 15 is rotatably connected between the support plate 19 inside the outer shell 14 and is coaxially fixed with the large gear 16. It is connected to the water distribution plate 12 below and transmits power through gear meshing, converting the rotational motion of the turntable handle 4 into the rotation of the water distribution plate 12. It is the key gear in the speed change mechanism for transmitting power and adjusting speed. Large gear 16: Large gear 16 is rotatably connected between the support plate 19 inside the outer shell 14 and fixed coaxially with small gear 15. One side meshes with small gear 2 17. The speed is amplified or reduced through gear transmission. The rotation speed of the water distribution plate 12 is adjusted in conjunction with the turntable handle 4 to meet the water distribution requirements under different working conditions. Small gear 2 17: Small gear 2 17 is rotatably connected to the rotating shaft inside the housing 14 and meshes with large gear 1 16. Its connecting shaft is coaxially fixed with the turntable handle 4. When the handle is turned, small gear 2 17 is driven to rotate, which drives large gear 1 16, small gear 1 15 and water distribution plate 12 to rotate through the gear transmission chain. It is the starting gear for manual power input. Large gear 2 18: Large gear 2 18 is rotatably connected to the rotating shaft of the support plate 19 and meshes with small gear 1 15. Its face facing small gear 2 17 is provided with a circumferential array of limiting posts 20, which are engaged with the tooth pitch of small gear 2 17.

[0029] Support plate 19: The support plate 19 is symmetrically fixed to the inner walls of both sides of the outer shell 14. It has a plate-like structure and is used to install the rotating shaft and gear assembly. It provides support and positioning for the large gear 16, small gear 17, etc., to ensure the coaxiality and stability of the gear transmission. It is the support frame of the speed change mechanism. Limiting pins 20: The limiting pins 20 are arranged in a circular array on the two end faces of the large gear and engage with the two tooth pitches of the small gear. Their function is to limit the gear meshing position, realize speed regulation in different gears, and adapt to different water distribution requirements.

[0030] Working principle: The water to be filtered first enters the inlet tank 1 and is then transported to the treatment tank 3 through the inlet pipe 2. At this time, rotating the turntable handle 4 causes its connecting shaft to drive the small gear 17 to rotate. The small gear 17 meshes with the large gear 16, driving the large gear 16 to rotate. Since the large gear 16 and the small gear 15 are coaxially fixed, the small gear 15 rotates accordingly, thereby driving the water distribution plate 12 to rotate. The triangular weir 13 on the outer arc surface of the water distribution plate 12 evenly divides the water flow and sprinkles it onto the filter media layer (above the filter plate 11 and the filter head 9). After the water is initially filtered by the dense filter screen of the filter plate 11, it enters the filter head 9 through the cross-shaped water outlet holes 10 at the top of the filter head 9. After being collected by the metal disc, the water flows through the siphon pipe 5 to the outlet tank 7, completing the filtration process. To adjust the speed of the water distribution disc 12, push the turntable handle 4 downwards, causing the coaxially fixed pinion 17 to move downwards along the rotation axis of the support plate 19 until the limiting post 20 on the end face of the large gear 18 is inserted into the tooth pitch gap of the pinion 17, forming a snap-fit ​​positioning. At this time, rotate the turntable handle 4, and the power is transmitted to the pinion 17 through the connecting shaft, causing it to rotate synchronously with the large gear 18. The large gear 18 then drives the pinion 15 through meshing transmission, thereby causing the pinion 15 to rotate coaxially, ultimately causing the water distribution disc 12 to rotate at the set speed.

[0031] As filtration proceeds, impurities are gradually trapped in the filter media layer above the filter plate 11, increasing the filter layer resistance and causing the water level in the treatment tank 3 to gradually rise. When the water level rises to the set threshold, a siphon effect is formed in the siphon pipe 5, causing the water level in the treatment tank 3 to drop rapidly and triggering the backwashing process. At this time, the water flow direction is reversed, and the water in the outlet tank 7 flows back into the treatment tank 3 through the siphon pipe 5. It impacts the filter media layer through the outlet hole 10 of the filter head 9, cleaning the trapped impurities. The impurities are discharged into the outlet tank 7 through the siphon pipe 5 after passing through the filter plate 11 with the backwash wastewater.

[0032] The bracket 6 securely installs the siphon pipe 5 by snap-fit ​​fixing block 8, ensuring that the position of the siphon pipe 5 is stable and the siphon effect is reliable during the siphon process. When the backwash is completed and the water level in the treatment tank 3 drops to the top of the siphon pipe 5, air enters the siphon pipe 5, the siphon is broken, the backwash stops, and the filter automatically returns to the filtration state, and so on.

[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A siphon filter with automatic control function, characterized in that: include: Water inlet tank (1), water inlet pipe (2), treatment water tank (3), and water outlet tank (7). The water inlet pipe (2) is fixedly installed on the bottom surface of the water inlet tank (1). The other end of the water inlet pipe (2) is connected to the inside of the treatment water tank (3). The water outlet tank (7) is fixedly installed on the bottom side of the treatment water tank (3) away from the water inlet tank (1). A filter mechanism is provided near the bottom of the treatment water tank (3), a speed change mechanism is provided above the filter mechanism, and a water distribution plate (12) is fixedly installed below the speed change mechanism. A siphon pipe (5) is fixedly installed inside the treatment water tank (3), and the outlet of the other end of the siphon pipe (5) is located above the outlet tank (7).

2. A siphon filter with automatic control function according to claim 1, characterized in that: The filtration mechanism includes a filter head (9) and a filter plate (11). A metal plate is fixedly installed inside the treatment tank (3) near the bottom. Filter heads (9) are fixedly installed on the metal plate at equal intervals. A filter plate (11) is fixedly installed inside the treatment tank (3) above the filter head (9). A dense filter screen is provided on the filter plate (11).

3. A siphon filter with automatic control function according to claim 2, characterized in that: The filter head (9) has a water outlet hole (10) which is in a cross shape.

4. A siphon filter with automatic control function according to claim 1, characterized in that: The speed change mechanism includes a housing (14), a support plate (19), a small gear (15), and a large gear (16). The housing (14) is fixedly installed on the inner top surface of the treatment tank (3). Support plates (19) are symmetrically fixedly installed on the inner walls of both sides of the housing (14). A large gear (16) is rotatably connected between a set of support plates (19). A small gear (15) is rotatably connected below the large gear (16). The small gear (15) and the large gear (16) are coaxially fixedly connected.

5. A siphon filter with automatic control function according to claim 4, characterized in that: The speed change mechanism also includes a turntable handle (4), a small gear two (17), a large gear two (18), and a rotating shaft fixedly installed between the remaining set of support plates (19). The small gear two (17) is rotatably connected to the rotating shaft, and the small gear two (17) meshes with the large gear one (16). The large gear two (18) is also rotatably connected inside the rotating shaft on the support plate (19). The large gear two (18) meshes with the small gear one (15). The turntable handle (4) is rotatably connected to the outer wall of the support plate (19). A connecting shaft is fixedly installed on the turntable handle (4). The connecting shaft on the turntable handle (4) is coaxially fixedly connected to the small gear two (17) and slidably connected to the rotating shaft on the support plate (19). The turntable handle (4) protrudes from the top surface of the treatment tank (3).

6. A siphon filter with automatic control function according to claim 5, characterized in that: The large gear 2 (18) has a circular array of limit posts (20) on the surface facing the small gear 2 (17), and the limit posts (20) and the tooth pitch on the small gear 2 (17) are engaged.

7. A siphon filter with automatic control function according to claim 6, characterized in that: A water distribution plate (12) is coaxially fixedly connected to the lower part of the small gear (15). Triangular weirs (13) are equidistantly provided on the outer arc surface of the water distribution plate (12).

8. A siphon filter with automatic control function according to claim 1, characterized in that: The bracket (6) has a triangular structure, and a snap-fit ​​fixing block (8) is fixedly installed on the top surface of the bracket (6). The snap-fit ​​fixing block (8) has an arc groove. The arc groove of the snap-fit ​​fixing block (8) is fixed to the outer arc surface of the siphon tube (5).

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