Self-cleaning maintenance pipeline foam mixer and control method

Abstract

The application relates to the technical field of foam mixers, and discloses a pipeline type foam mixer capable of realizing self-cleaning maintenance and a control method, which solves the problem that the existing pipeline type foam mixer cannot realize self-cleaning maintenance, and comprises a foam mixer body, wherein the foam mixer body is composed of a water inlet section, a converging section, a negative pressure section, a diffusion section and a foam liquid inlet section; the water inlet section is connected with a water supply pipe; the diffusion section is connected with a drain pipe; the foam liquid inlet section is connected with a foam tank through a foam suction pipe; the arc-shaped outer surface of the water inlet section is symmetrically provided with a flushing water inlet interface I and a flushing water inlet interface II; a clean water supply pipe is arranged on the flushing water inlet interface I; a clean water supply branch pipe I is arranged between the clean water supply pipe and the flushing water inlet interface II; and a clean water supply branch pipe II is arranged between the clean water supply pipe and the foam suction pipe; through the pipeline type foam mixer, self-cleaning maintenance can be realized.

Description

Technical Field

[0001] This invention belongs to the field of foam mixer technology, specifically a self-cleaning and maintenance inline foam mixer and its control method. Background Technology

[0002] Existing inline foam mixers are widely used in fire protection, chemical, and environmental protection fields. They mainly rely on the Venturi effect to achieve negative pressure intake and mixing of water and foam liquid, and have a simple structure and high mixing efficiency. However, in actual long-term use, the following technical defects exist:

[0003] 1. Additives, impurities, and sediments produced during the mixing process in foam liquid can easily adhere to key parts such as negative pressure chamber, diffusion section, and foam inlet channel. Long-term accumulation will cause narrowing of flow channel, imbalance of mixing ratio, and decrease in foaming effect.

[0004] 2. Traditional mixers do not have a built-in self-cleaning structure. Cleaning requires stopping the machine, disassembling the equipment, and manually brushing and rinsing. The operation is cumbersome, time-consuming and labor-intensive, which affects the continuous operation efficiency of the equipment. In addition, manual cleaning is difficult to cover dead areas such as the negative pressure chamber and the inner wall of the liquid inlet section, resulting in incomplete cleaning.

[0005] 3. Relying solely on external high-pressure water rinsing cannot effectively clean narrow channels such as the foam inlet section, making it difficult to remove stubborn dirt and resulting in limited cleaning effectiveness.

[0006] Based on the above problems, existing inline foam mixers cannot meet the requirements for long-term stable use, disassembly-free operation, and automated cleaning and maintenance. There is an urgent need for an inline foam mixer with self-cleaning function and a matching control method. Summary of the Invention

[0007] In view of the above situation and to overcome the defects of the prior art, the present invention provides a self-cleaning and maintenance inline foam mixer and control method, which effectively solves the problem that the existing inline foam mixer cannot achieve self-cleaning and maintenance.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a self-cleaning and maintenance inline foam mixer and its control method, comprising a foam mixer body, wherein the foam mixer body is composed of an inlet section, a convergence section, a negative pressure section, a diffusion section and a foam liquid inlet section, the convergence section is fixedly connected to one end of the inlet section and passes through the negative pressure section, the diffusion section is fixedly connected to the end of the negative pressure section away from the inlet section, the foam liquid inlet section is fixedly connected to the top of the negative pressure section, the inlet section is connected to a water supply pipe, the diffusion section is connected to a drain pipe, the foam liquid inlet section is connected to a foam tank through a foam suction pipe, and the arc-shaped outer surface of the inlet section is symmetrically provided with a flushing water inlet interface one and a flushing water inlet interface two, a clean water supply pipe is provided on the flushing water inlet interface one, a clean water supply branch pipe one is provided between the clean water supply pipe and the flushing water inlet interface two, and a clean water supply branch pipe two is provided between the clean water supply pipe and the foam suction pipe;

[0009] The foam inlet section is equipped with a scrubbing mechanism. One end of the scrubbing mechanism is inserted into the outer surface of the converging section, and the other end of the scrubbing mechanism extends into the interior of the foam suction tube. The inlet section and the converging section are integrally formed structures. The inlet section and the converging section are symmetrically provided with inlet channel one and inlet channel two. Inlet channel one and inlet channel two are respectively connected to rinsing inlet interface one and rinsing inlet interface two. A rinsing mechanism connected to inlet channel one and inlet channel two is fixedly installed at one end of the outer surface of the converging section.

[0010] Preferably, the foam suction pipe is equipped with an electric regulating valve one, the purified water supply pipe is equipped with an electric regulating valve two, and the purified water supply branch pipe two is equipped with an electric regulating valve three.

[0011] Preferably, a negative pressure cavity is formed inside the negative pressure section, and the sides at both ends of the negative pressure cavity are rounded. Several guide ribs are fixedly provided at one end of the side of the negative pressure cavity near the diffuser section, and the guide ribs are rounded transition structures.

[0012] Preferably, a plurality of flow-guiding ribs are fixedly provided on the inner surface of the diffusion section, and the flow-guiding ribs are rounded corner transition structures.

[0013] Preferably, both the negative pressure section and the diffusion section are fixedly provided with vent pipes at their bottom ends, and vent valves are provided on the vent pipes.

[0014] Preferably, the rinsing mechanism consists of an annular water pipe, two short inlet pipes, several rinsing nozzles, and a driving nozzle. The two short inlet pipes are inserted into the converging section and are respectively connected to the first inlet channel and the second inlet channel. The annular water pipe is fixedly connected to the outer surface of the converging section and is connected to the two short inlet pipes. The rinsing nozzles are fixedly connected to one side of the annular water pipe, and the driving nozzles are fixedly connected to the top of the other side of the annular water pipe.

[0015] Preferably, the brushing mechanism comprises a limiting support component one, a limiting support component two, a combined support rod, several brushes, and several flat blades. The limiting support component one is fixedly connected to one end inside the foam inlet section, the limiting support component two is embedded in the outer surface of the converging section, the combined support rod passes through the limiting support component one and is inserted into the limiting support component two, the brushes are fixedly connected to the outer surface of the combined support rod and fit against the inner sidewall of the foam inlet section, and the flat blades are fixedly connected to one end of the outer surface of the combined support rod and aligned with the drive nozzle.

[0016] Preferably, the combined support rod consists of a long rod, a short rod, and a connecting rod. The connecting rod is fixedly connected between the long rod and the short rod. The limiting support assembly consists of a U-shaped support frame and a limiting sleeve. The connecting rod passes through the limiting sleeve and is slidably connected to the limiting sleeve. The length of the connecting rod is greater than the length of the limiting sleeve. A permanent magnet is fixedly installed at one end of the limiting sleeve, and a permanent magnet is fixedly installed at one end of the long rod.

[0017] Preferably, the end of the long rod away from the connecting rod has an inclined structure. The limiting support component two consists of a bushing, several side limiting bullseye wheels and an end limiting bullseye wheel. The side limiting bullseye wheels are fixedly connected to the side inside the bushing and fit against the side of the long rod. The end limiting bullseye wheel is fixedly connected to one end inside the bushing and fits against the inclined end face of the long rod.

[0018] Preferably, the control method for the self-cleaning and maintenance inline foam mixer includes the following steps:

[0019] S1. Standby state: Electric regulating valve 1, electric regulating valve 2, and electric regulating valve 3 are all closed, the drain valve is closed, the brushing mechanism is stationary, and the system monitors the water supply pressure and operating commands in real time.

[0020] S2, Foam Mixing Working Mode: After receiving the working signal, open electric regulating valve one, close electric regulating valve two and electric regulating valve three, supply water to the water inlet section, and the water flows through the convergence section to enter the negative pressure section to form a negative pressure. The foam liquid in the foam tank enters the negative pressure section through the foam suction pipe and the foam liquid inlet section to mix with the water. The mixed liquid is output through the diffusion section and the drain pipe. The flow guide rib one and the flow guide rib two stabilize the flow and homogenize the mixed liquid.

[0021] S3. Self-cleaning start conditions: When the work is completed or the preset cleaning cycle is reached, the system triggers the self-cleaning mode, first closing the electric regulating valve one to cut off the supply of foam liquid.

[0022] S4. Hydraulic flushing and brushing linkage: Open electric regulating valve 2 and electric regulating valve 3. Clean water enters water inlet channel 1 and water inlet channel 2 through the clean water supply pipe, flushing inlet port 1 and flushing inlet port 2, and then enters the annular water pipe through the short inlet pipe. The flushing nozzles perform high-pressure flushing on the inner walls of the negative pressure section and the diffusion section. At the same time, the nozzles are driven to jet water onto the flat blades, which pushes the combined support rod to rotate and drives the brush to brush the inner wall of the foam inlet section. During the brushing process, the combined support rod, together with the end limiting bullseye wheel, permanent magnet 1 and permanent magnet 2, achieves reciprocating motion, thereby driving the brush to reciprocate axially and improving the brushing effect.

[0023] S5. Sewage and drainage: Open the drainage valve to discharge the flushing sewage through the drainage pipe. After a preset time, close the electric regulating valve 2 and electric regulating valve 3 to stop water supply and washing.

[0024] S6. Reset Standby: After purging is completed, close the purging valve, and the system returns to standby mode, completing one self-cleaning maintenance process.

[0025] Compared with the prior art, the beneficial effects of the present invention are:

[0026] (1) The cleaning process can be automatically started when the work is finished or the preset cycle is reached through the linkage of the built-in flushing mechanism, brushing mechanism and electric regulating valve. The entire process does not require manual disassembly of the equipment, which greatly reduces maintenance intensity and downtime and improves equipment operating efficiency.

[0027] (2) The high-pressure flushing nozzle flushes the inner wall of the negative pressure section and the diffusion section in a full range; the driving nozzle jet pushes the brush to rotate and brush, and the permanent magnet and the bullseye wheel realize the axial reciprocating motion of the brush, so as to achieve all-round brushing of narrow channels such as the foam inlet section, and thoroughly remove stubborn dirt and deposits.

[0028] (3) The negative pressure chamber adopts a rounded corner structure, combined with the first and second guide ribs, which not only improves the stable flow and uniform mixing effect of foam mixing, but also avoids the accumulation of dirt in dead corners; the drain pipe and drain valve can quickly discharge the flushing sewage and residual mixed liquid to prevent the stored liquid from deteriorating and secondary scaling.

[0029] (4) The inlet section and the converging section are integrally formed, and the flushing channel is built-in, without changing the original Venturi mixing structure and working principle; the brushing mechanism adopts limit support and bullseye wheel guide, and the rotation and reciprocating motion is smooth, without jamming, with little wear and long service life.

[0030] (5) The six-step control method realizes the full-process automation of standby, mixing, self-cleaning, sewage discharge and reset. It can flexibly trigger cleaning according to pressure and time, adapt to the continuous operation needs of different scenarios such as fire protection and chemical industry, and improve the intelligence and versatility of equipment. Attached Figure Description

[0031] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof.

[0032] In the attached diagram:

[0033] Figure 1 This is a schematic diagram of the self-cleaning and maintenance inline foam mixer of the present invention;

[0034] Figure 2 This is a cross-sectional view of the self-cleaning and maintenance inline foam mixer of the present invention;

[0035] Figure 3 This is a cross-sectional view of the foam mixer body of the present invention;

[0036] Figure 4 For the present invention Figure 3 A magnified view of a section at point A in the middle;

[0037] Figure 5 This is a schematic diagram of the brushing mechanism of the present invention;

[0038] Figure 6 For the present invention Figure 5 A magnified view of a section at point B in the middle;

[0039] Figure 7 This is a schematic diagram of the connection structure between the limiting support component 2 and the combined support rod of the present invention;

[0040] In the diagram: 1. Foam mixer body; 2. Inlet section; 3. Converging section; 4. Negative pressure section; 5. Diffusion section; 6. Foam liquid inlet section; 7. Foam suction pipe; 8. Rinsing inlet port one; 9. Rinsing inlet port two; 10. Clean water supply pipe; 11. Clean water supply branch pipe one; 12. Clean water supply branch pipe two; 13. Scrubbing mechanism; 14. Inlet channel one; 15. Inlet channel two; 16. Rinsing mechanism; 17. Electric regulating valve one; 18. Electric regulating valve two; 19. Electric regulating valve three; 20. Negative pressure chamber; 21. Guide rib one ; 22. Guide rib II; 23. Drain pipe; 24. Drain valve; 25. Annular water pipe; 26. Inlet short pipe; 27. Flushing nozzle; 28. Drive nozzle; 29. ​​Limiting support assembly I; 30. Limiting support assembly II; 31. Combined support rod; 32. Brush; 33. Flat blade; 34. Long rod; 35. Short rod; 36. Connecting rod; 37. U-shaped support frame; 38. Limiting sleeve; 39. Permanent magnet I; 40. Permanent magnet II; 41. Bushing; 42. Side limiting bullseye wheel; 43. End limiting bullseye wheel. Detailed Implementation

[0041] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0042] Example 1, by Figures 1 to 3 The present invention discloses a self-cleaning and maintenance inline foam mixer and its control method, comprising a foam mixer body 1, which is composed of an inlet section 2, a converging section 3, a negative pressure section 4, a diffusion section 5, and a foam inlet section 6. The converging section 3 is fixedly connected to one end of the inlet section 2 and passes through the negative pressure section 4. The diffusion section 5 is fixedly connected to the end of the negative pressure section 4 away from the inlet section 2. The foam inlet section 6 is fixedly connected to the top of the negative pressure section 4. The inlet section 2 is connected to a water supply pipe, the diffusion section 5 is connected to a drain pipe, and the foam inlet section 6 is connected to a foam tank through a foam suction pipe 7. The arc-shaped outer surface of the inlet section 2 is symmetrically provided with a first flushing water inlet port 8 and a second flushing water inlet port 9. A clean water supply pipe 10 is provided on the first flushing water inlet port 8. A clean water supply branch pipe 11 is provided between the clean water supply pipe 10 and the flushing water inlet 9. A clean water supply branch pipe 12 is provided between the clean water supply pipe 10 and the foam suction pipe 7. A scrubbing mechanism 13 is provided inside the foam inlet section 6. One end of the scrubbing mechanism 13 is inserted into the outer surface of the converging section 3, and the other end of the scrubbing mechanism 13 extends into the interior of the foam suction pipe 7. The inlet section 2 and the converging section 3 are integrally formed structures. The inlet section 2 and the converging section 3 are symmetrically provided with inlet channels 14 and 25. Inlet channels 14 and 25 are respectively connected to the flushing water inlet 8 and the flushing water inlet 9. A flushing mechanism 16 is fixedly provided at one end of the outer surface of the converging section 3, which is connected to inlet channels 14 and 25.

[0043] Water flows into the inlet section 2 and accelerates and depressurizes through the contraction of the converging section 3, forming a negative pressure inside the negative pressure section 4. The negative pressure draws the foam liquid from the foam tank into the negative pressure chamber 20 through the foam suction pipe 7 and the foam inlet section 6, where it mixes with water. The mixture is then output after being stabilized by the diffusion section 5. The inlet section 2 and the converging section 3 are integrally molded, with symmetrical inlet channels 14 and 25 inside, which are connected to the rinsing inlet port 18 and the rinsing inlet port 29, respectively. Together with the clean water supply pipe 10, the clean water supply branch pipe 11 and the clean water supply branch pipe 22, they form an independent clean water supply circuit. The clean water circuit and the working water circuit are isolated from each other, so as not to affect the normal foam mixing operation, while providing a stable high-pressure water source for subsequent rinsing and scrubbing.

[0044] Example 2, based on Example 1, is... Figures 1 to 3As shown, an electric regulating valve 17 is installed on the foam suction pipe 7, an electric regulating valve 18 is installed on the purified water supply pipe 10, an electric regulating valve 19 is installed on the purified water supply branch pipe 12, a negative pressure chamber 20 is formed inside the negative pressure section 4, the sides of both ends of the negative pressure chamber 20 are rounded, a number of guide ribs 21 are fixedly installed on the side of the negative pressure chamber 20 near the diffuser section 5, the guide ribs 21 are rounded transition structure, a number of guide ribs 22 are fixedly installed on the inner surface of the diffuser section 5, the guide ribs 22 are rounded transition structure, a drain pipe 23 is fixedly installed at the bottom of both the negative pressure section 4 and the diffuser section 5, and a drain valve 24 is installed on the drain pipe 23;

[0045] The supply of foam liquid and the opening and closing of the main cleaning water circuit and the foam suction pipe cleaning branch are controlled by electric regulating valve 17, electric regulating valve 28, and electric regulating valve 39 respectively, realizing the automatic switching between mixing mode and self-cleaning mode. The negative pressure chamber 20 adopts a rounded corner structure to avoid eddy dead zone and dirt deposition. The negative pressure section 4 and the diffusion section 5 are respectively equipped with guide rib 1 21 and guide rib 2 22 to guide and comb the mixed liquid, improve the mixing uniformity and reduce flow resistance. The bottom of the negative pressure section 4 and the diffusion section 5 are equipped with drain pipe 23 and drain valve 24, which can quickly discharge the internal sewage and residual mixed liquid after cleaning, prevent the liquid from deteriorating and secondary scaling, and improve the cleaning and operational reliability of the equipment.

[0046] Example 3, based on Example 1, is... Figures 1 to 7The flushing mechanism 16 consists of an annular water pipe 25, two short inlet pipes 26, several flushing nozzles 27, and a drive nozzle 28. The two short inlet pipes 26 are inserted into the converging section 3 and connected to inlet channel 14 and inlet channel 25 respectively. The annular water pipe 25 is fixedly connected to the outer surface of the converging section 3 and connected to the two short inlet pipes 26. The flushing nozzles 27 are fixedly connected to one side of the annular water pipe 25, and the drive nozzles 28 are fixedly connected to the top of the other side of the annular water pipe 25. The brushing mechanism 13 consists of a... The system comprises a first support component 29, a second limiting support component 30, a combined support rod 31, several brushes 32, and several flat blades 33. The first limiting support component 29 is fixedly connected to one end inside the foam inlet section 6. The second limiting support component 30 is embedded in the outer surface of the converging section 3. The combined support rod 31 passes through the first limiting support component 29 and inserts into the second limiting support component 30. The brushes 32 are fixedly connected to the outer surface of the combined support rod 31 and fit against the inner wall of the foam inlet section 6. The flat blades 33... 3. One end of the combined support rod 31 is fixedly connected to the outer surface and aligned with the drive nozzle 28. The combined support rod 31 consists of a long rod 34, a short rod 35, and a connecting rod 36. The connecting rod 36 is fixedly connected between the long rod 34 and the short rod 35. The limiting support assembly 29 consists of a U-shaped support frame 37 and a limiting sleeve 38. The connecting rod 36 passes through the limiting sleeve 38 and is slidably connected to the limiting sleeve 38. The length of the connecting rod 36 is greater than the length of the limiting sleeve 38. One end of the rod 8 is fixedly provided with a permanent magnet 39, and one end of the long rod 34 is fixedly provided with a permanent magnet 40. The end of the long rod 34 away from the connecting rod 36 is a sloping structure. The limiting support component 30 is composed of a bushing 41, several side limiting bullseye wheels 42 and end limiting bullseye wheels 43. The side limiting bullseye wheels 42 are fixedly connected to the side inside the bushing 41 and fit against the side of the long rod 34. The end limiting bullseye wheels 43 are fixedly connected to one end inside the bushing 41 and fit against the sloping end face of the long rod 34.

[0047] High-pressure purified water enters the annular water pipe 25 through inlet channel 14, inlet channel 25, and inlet short pipe 26. Part of the water is jetted at high pressure by flushing nozzle 27 into the inner wall of negative pressure section 4 and diffuser section 5 to remove deposits from the wall surface; another part is jetted directionally by drive nozzle 28 to impact flat blade 33, driving the combined support rod 31 to rotate, which in turn drives brush 32 to rotate and scrub the inner wall of foam inlet section 6. The combined support rod 31 is radially fixed by limiting support assembly 1 29 and limiting support assembly 2 30. Position and axial guidance, connecting rod 36 and limiting sleeve 38 slide in fit, permanent magnet 1 39 and permanent magnet 2 40 generate magnetic force, which, together with end inclined surface and end limiting bullseye wheel 43, realizes axial limiting and automatic reversal, so that the support rod reciprocates along the axial direction while rotating, driving brush 32 to fully cover the inner wall of foam liquid inlet section 6, remove stubborn dirt, and side limiting bullseye wheel 42 reduces axial sliding friction, ensuring smooth and jam-free movement, realizing the coordinated operation of water flushing and mechanical brushing, cleaning without dead corners.

[0048] A control method for a self-cleaning and maintenance inline foam mixer includes the following steps:

[0049] S1. Standby state: Electric regulating valve 17, electric regulating valve 28, and electric regulating valve 319 are all closed, drain valve 24 is closed, brushing mechanism 13 is stationary, and the system monitors water supply pressure and operation commands in real time.

[0050] S2, Foam Mixing Working Mode: After receiving the working signal, open the electric regulating valve 17 and close the electric regulating valve 218 and electric regulating valve 319. The water supply pipe supplies water to the water inlet section 2. The water flows through the convergence section 3 and enters the negative pressure section 4 to form a negative pressure. The foam liquid in the foam tank enters the negative pressure section 4 through the foam suction pipe 7 and the foam liquid inlet section 6 and mixes with the water. The mixed liquid is output through the diffusion section 5 and the drain pipe. The flow guide rib 121 and the flow guide rib 22 stabilize and homogenize the mixed liquid.

[0051] S3. Self-cleaning start conditions: When the work is completed or the preset cleaning cycle is reached, the system triggers the self-cleaning mode, first closing the electric regulating valve 17 to cut off the supply of foam liquid.

[0052] S4. Hydraulic flushing and brushing linkage: Open electric regulating valve 2 18 and electric regulating valve 3 19. Clean water enters water inlet channel 1 14 and water inlet channel 2 15 through clean water supply pipe 10, flushing inlet port 1 8 and flushing inlet port 2 9, and then enters annular water pipe 25 through short inlet pipe 26. The flushing nozzle 27 performs high-pressure flushing on the inner wall of negative pressure section 4 and diffuser section 5. At the same time, the nozzle 28 is driven to jet water onto the flat blade 33, which pushes the combined support rod 31 to rotate, driving the brush 32 to brush the inner wall of foam inlet section 6. During the brushing process, the combined support rod 31 works with the end limiting bullseye wheel 43, permanent magnet 1 39 and permanent magnet 2 40 to achieve reciprocating motion, thereby driving the brush 32 to reciprocate axially, improving the brushing effect.

[0053] S5. Sewage and drainage: Open the drainage valve 24 to discharge the flushing sewage through the drainage pipe 23. After a preset time, close the electric regulating valve 2 18 and the electric regulating valve 3 19 to stop water supply and washing.

[0054] S6. Reset Standby: After purging is completed, close the purging valve 24, and the system returns to standby mode, completing one self-cleaning maintenance process.

[0055] This invention utilizes a built-in rinsing mechanism, a brushing mechanism, and an electric regulating valve to automatically initiate the cleaning process upon completion of work or reaching a preset cycle. The entire process requires no manual disassembly, significantly reducing maintenance intensity and downtime, and improving equipment operating efficiency. High-pressure rinsing nozzles thoroughly rinse the inner walls of the negative pressure section and the diffusion section. The driving nozzle jet propels the rotating brush, which, in conjunction with a permanent magnet and a bullseye wheel, achieves axial reciprocating motion, thoroughly cleaning narrow channels such as the foam inlet section to completely remove stubborn dirt and deposits. The negative pressure chamber employs a rounded corner structure, along with guide ribs one and two, which enhance the stable and uniform mixing of the foam. Effective and prevents dirt buildup in hard-to-reach areas; the drain pipe and drain valve can quickly discharge flushing wastewater and residual mixture, preventing liquid deterioration and secondary scaling; the inlet section and convergence section are integrally molded, and the flushing channel is built-in, without changing the original Venturi mixing structure and working principle; the brushing mechanism adopts limit support and bullseye wheel guidance, ensuring smooth rotation and reciprocating motion, no jamming, minimal wear, and long service life; the six-step control method realizes full automation of standby, mixing, self-cleaning, sewage discharge, and reset, and can flexibly trigger cleaning according to pressure and time, adapting to the continuous operation needs of different scenarios such as fire fighting and chemical industry, improving the intelligence and versatility of the equipment.

Claims

1. A self-cleaning and maintenance inline foam mixer, comprising a foam mixer body (1), characterized in that: The foam mixer body (1) consists of an inlet section (2), a convergence section (3), a negative pressure section (4), a diffusion section (5), and a foam inlet section (6). The convergence section (3) is fixedly connected to one end of the inlet section (2) and passes through the negative pressure section (4). The diffusion section (5) is fixedly connected to the end of the negative pressure section (4) away from the inlet section (2). The foam inlet section (6) is fixedly connected to the top of the negative pressure section (4). The inlet section (2) is connected to the water supply pipe, and the diffusion section (5) is connected to the drain pipe. The foam inlet section (6) is connected to the foam tank through the foam suction pipe (7). The arc-shaped outer surface of the water inlet section (2) is symmetrically provided with a first flushing water inlet (8) and a second flushing water inlet (9). A clean water supply pipe (10) is provided on the first flushing water inlet (8). A first clean water supply branch pipe (11) is provided between the clean water supply pipe (10) and the second flushing water inlet (9). A second clean water supply branch pipe (12) is provided between the clean water supply pipe (10) and the foam suction pipe (7). The foam inlet section (6) is equipped with a scrubbing mechanism (13). One end of the scrubbing mechanism (13) is inserted into the outer surface of the converging section (3), and the other end of the scrubbing mechanism (13) extends into the foam suction tube (7). The inlet section (2) and the converging section (3) are integrally formed structures. The inlet section (2) and the converging section (3) are symmetrically provided with inlet channel one (14) and inlet channel two (15). Inlet channel one (14) and inlet channel two (15) are respectively connected to flushing inlet interface one (8) and flushing inlet interface two (9). One end of the outer surface of the converging section (3) is fixedly provided with a flushing mechanism (16) connected to inlet channel one (14) and inlet channel two (15).

2. The self-cleaning and maintenance inline foam mixer according to claim 1, characterized in that: The foam suction pipe (7) is equipped with an electric regulating valve one (17), the water supply pipe (10) is equipped with an electric regulating valve two (18), and the water supply branch pipe two (12) is equipped with an electric regulating valve three (19).

3. A self-cleaning and maintenance inline foam mixer according to claim 1, characterized in that: The negative pressure section (4) forms a negative pressure cavity (20). The sides of both ends of the negative pressure cavity (20) are rounded. Several guide ribs (21) are fixedly provided on the side of the negative pressure cavity (20) near the diffuser section (5). The guide ribs (21) are rounded transition structures.

4. A self-cleaning and maintenance inline foam mixer according to claim 1, characterized in that: The inner surface of the diffusion section (5) is fixedly provided with several flow guiding ribs (22), and the flow guiding ribs (22) are rounded transition structures.

5. A self-cleaning and maintenance inline foam mixer according to claim 1, characterized in that: Both the negative pressure section (4) and the diffusion section (5) are fixedly provided with an exhaust pipe (23), and an exhaust valve (24) is provided on the exhaust pipe (23).

6. A self-cleaning and maintenance inline foam mixer according to claim 1, characterized in that: The flushing mechanism (16) consists of an annular water pipe (25), two short inlet pipes (26), several flushing nozzles (27) and a drive nozzle (28). The two short inlet pipes (26) are inserted into the converging section (3) and are connected to the first inlet channel (14) and the second inlet channel (15) respectively. The annular water pipe (25) is fixedly connected to the outer surface of the converging section (3) and is connected to the two short inlet pipes (26). The flushing nozzle (27) is fixedly connected to one side of the annular water pipe (25), and the drive nozzle (28) is fixedly connected to the top of the other side of the annular water pipe (25).

7. A self-cleaning and maintenance inline foam mixer according to claim 6, characterized in that: The brushing mechanism (13) consists of a first limiting support component (29), a second limiting support component (30), a combined support rod (31), several brushes (32) and several flat blades (33). The first limiting support component (29) is fixedly connected to one end inside the foam inlet section (6). The second limiting support component (30) is embedded in the outer surface of the converging section (3). The combined support rod (31) passes through the first limiting support component (29) and is inserted into the second limiting support component (30). The brushes (32) are fixedly connected to the outer surface of the combined support rod (31) and are attached to the inner wall of the foam inlet section (6). The flat blades (33) are fixedly connected to one end of the outer surface of the combined support rod (31) and are aligned with the drive nozzle (28).

8. A self-cleaning and maintenance inline foam mixer according to claim 7, characterized in that: The combined support rod (31) is composed of a long rod body (34), a short rod body (35) and a connecting rod body (36). The connecting rod body (36) is fixedly connected between the long rod body (34) and the short rod body (35). The limiting support assembly (29) is composed of a U-shaped support frame (37) and a limiting sleeve (38). The connecting rod body (36) passes through the limiting sleeve (38) and is slidably connected with the limiting sleeve (38). The length of the connecting rod body (36) is greater than the length of the limiting sleeve (38). A permanent magnet (39) is fixedly provided at one end of the limiting sleeve (38), and a permanent magnet (40) is fixedly provided at one end of the long rod body (34).

9. A self-cleaning and maintenance inline foam mixer according to claim 1, characterized in that: The end of the long rod (34) away from the connecting rod (36) is a sloping structure. The limiting support component 2 (30) is composed of a bushing (41), several side limiting bullseye wheels (42) and an end limiting bullseye wheel (43). The side limiting bullseye wheels (42) are fixedly connected to the side inside the bushing (41) and fit against the side of the long rod (34). The end limiting bullseye wheels (43) are fixedly connected to one end inside the bushing (41) and fit against the sloping end face of the long rod (34).

10. A self-cleaning and maintenance inline foam mixer according to any one of claims 1-9, characterized in that: The control method for the self-cleaning and maintenance inline foam mixer includes the following steps: S1, Standby state: Electric regulating valve one (17), electric regulating valve two (18), and electric regulating valve three (19) are all in the closed state, the drain valve (24) is in the closed state, the brushing mechanism (13) is stationary, and the system monitors the water supply pressure and operation commands in real time. S2, Foam Mixing Working Mode: After receiving the working signal, open the electric regulating valve one (17), close the electric regulating valve two (18) and the electric regulating valve three (19), supply water to the water inlet section (2), the water flows through the convergence section (3) and enters the negative pressure section (4) to form a negative pressure, the foam liquid in the foam tank enters the negative pressure section (4) through the foam suction pipe (7) and the foam liquid inlet section (6) and mixes with the water, the mixed liquid is output through the diffusion section (5) and the drain pipe, the flow guide rib one (21) and the flow guide rib two (22) stabilize the flow and mix the mixed liquid; S3. Self-cleaning start conditions: When the work is completed or the preset cleaning cycle is reached, the system triggers the self-cleaning mode, first closing the electric regulating valve (17) to cut off the supply of foam liquid; S4. Hydraulic flushing and brushing linkage: Open electric regulating valve 2 (18) and electric regulating valve 3 (19). Clean water enters water inlet channel 1 (14) and water inlet channel 2 (15) through clean water supply pipe (10), flushing inlet port 1 (8) and flushing inlet port 2 (9), and then enters ring water pipe (25) through water inlet short pipe (26). The flushing nozzle (27) performs high-pressure flushing on the inner wall of negative pressure section (4) and diffusion section (5). At the same time, drive the nozzle (28) to jet towards the flat blade (33), push the combined support rod (31) to rotate, and drive the brush (32) to brush the inner wall of foam inlet section (6). During the brushing process, the combined support rod (31) works with the end limiting bullseye wheel (43), permanent magnet 1 (39) and permanent magnet 2 (40) to achieve reciprocating motion, thereby driving the brush (32) to reciprocate axially and improve the brushing effect. S5. Sewage and drainage: Open the drainage valve (24) to discharge the flushing sewage through the drainage pipe (23). After a preset time, close the electric regulating valve 2 (18) and the electric regulating valve 3 (19) to stop water supply and washing. S6. Reset to standby: After purging is completed, close the purging valve (24), and the system returns to standby state, completing one self-cleaning maintenance process.

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