A combined high-efficiency paint mist capture and treatment device

Abstract

The present invention discloses a paint mist capture and treatment device, which includes a box, a fan, a paint spraying room, a water vortex treatment room, a drying adsorption room, and a water reservoir; the paint spraying room, the water vortex treatment room, the drying adsorption room, and the water reservoir are all arranged in the box, wherein the paint spraying room, the water vortex treatment room, and the drying adsorption room are arranged in sequence from left to right in the box, and the water reservoir is arranged in the lower part of the box and below both the water vortex treatment room and the drying adsorption room; the fan is arranged outside the box, and is located at the air flow outlet of the drying adsorption room. The present invention comprehensively considers the layout characteristics of the paint mist treatment space flow field through a combination of a vortex groove structure, a water vortex barrel design, and a water curtain plate design, optimizes the design of the space flow field based on the gas-liquid multiphase fluid flow dynamics theory, and can efficiently capture and treat the paint mist.

Description

Technical Field

[0001] The invention relates to a waste gas treatment environmental protection equipment design technology in the spraying industry field, and in particular to a paint mist capture and treatment device. Background Art

[0002] Paint spraying is a very important link in the manufacturing process of mechanical and electrical products such as automotive parts. During spraying production, not only the processing quality of the product surface should be considered, but also the environmental problems that may be caused by exhaust gas emissions during the spraying production process. During the paint spraying production process, high-pressure gas sprays most of the atomized micro-paint droplets onto the surface of the workpiece, and the excess paint mist will diffuse in the spraying studio. If this part of the excess paint mist is not properly handled, it will adhere to the equipment in the spraying room, affecting the working performance and service life of the equipment, and it will also endanger the physical and mental health of the operators, making it difficult to meet the requirements of environmental protection regulations.

[0003] In order to effectively clean paint mist, various capture and treatment equipment design and manufacturing technologies have made great progress. Patent CN108160381B introduces a water curtain spray booth design. The specific measures are to set three overflow troughs on the top of the spray booth. Each overflow trough is equipped with an inclined water curtain plate at the overflow port. The three water curtain plates are parallel to each other, so that the paint mist dispersed in the air can be fully integrated with water, thereby improving the paint mist purification efficiency. Patent CN 207357449U provides a water cyclone design for paint mist capture in a water cyclone spray booth. The paint mist capture effect is enhanced by rotating the atomizing wheel at high speed under the action of the exhaust fan. Patent CN 208373409U sets the exhaust fan on the top of the air-water separation chamber of the water curtain spray booth, and provides a labyrinth water baffle in the air-water separation chamber. Patent CN 109433501A introduces a multi-stage water cyclone paint spraying cabinet with a reaction chamber. The reaction chamber is provided with a spray device for spraying liquid medicine. The liquid medicine in the water outlet tank flows out and forms a water curtain for absorbing paint. Patent CN 208554771U is provided with an activated carbon exhaust gas purifier at the upper end of the water curtain spray booth to enhance the exhaust gas purification effect. The aforementioned design schemes enhance the capture and treatment effects of paint mist from different links, and effectively meet the treatment requirements of exhaust gas in the paint spraying production process of various products. However, in terms of the flow field distribution characteristics when the exhaust gas flows, these design schemes still have a lot of room for improvement. Summary of the invention

[0004] The problem to be solved by the present invention is to provide a paint mist capture and treatment device. The device comprehensively considers the layout characteristics of the paint mist treatment spatial flow field through a combination of a vortex groove structure, a water swirl barrel design, a water curtain plate design, etc., and optimizes the design of the spatial flow field based on the gas-liquid multiphase fluid flow dynamics theory, so that the paint mist can be captured and treated efficiently.

[0005] The combined high-efficiency paint mist capturing and treating device of the present invention comprises a casing, a fan, a paint spraying room, a water vortex treatment room, a drying adsorption room and a water reservoir; the paint spraying room, the water vortex treatment room, the drying adsorption room and the water reservoir are all arranged in the casing, wherein the paint spraying room, the water vortex treatment room and the drying adsorption room are arranged in sequence from left to right in the casing, the water reservoir is arranged in the lower part of the casing and is located below both the water vortex treatment room and the drying adsorption room; the fan is arranged outside the casing and is located at the airflow outlet of the drying adsorption room.

[0006] Furthermore, the paint spray booth includes a pedal, a water curtain plate, a water curtain spray device, and a reinforcing rib; the pedal is located at the lower part of the paint spray booth and is arranged downwardly from left to right, the water reservoir is located on the right side of the pedal and its highest liquid level is lower than the rightmost height of the pedal; the reinforcing rib is fixed in the box body, and its top, front and back are all closed to the inner wall of the box body; the water curtain plate is an arc-shaped structure, and its straight face is fixed to the left side of the reinforcing rib, and the front and back of the water curtain plate are all closed to the inner wall of the box body; the water curtain spray device is fixed under the top of the box body, and it includes a plurality of spray heads, which are evenly arranged from front to back, and the spray heads are tilted, and their spray ports point to the upper part of the water curtain plate.

[0007] Furthermore, the pedal has an inclination angle of 5°-10°.

[0008] Furthermore, the water curtain plate is arc-shaped, and the arc of the water curtain plate is convex.

[0009] Furthermore, the paint spraying room also includes a vortex groove, which has a semicircular structure, is arranged at the lower side of the water curtain plate, and is arranged to be tilted to the right from bottom to top. The front and rear of the vortex groove are closed to the inner wall of the box body.

[0010] Furthermore, the concave circular surface of the vortex groove faces the paint spraying room, the inclination angle of the vortex groove is 10°-20°, the upper part of the vortex groove is located on the right side of the reinforcing rib and is higher than the bottom of the reinforcing rib, forming a narrow gap, and its lower part is located on the left side of the reinforcing rib.

[0011] Furthermore, the water treatment chamber includes a partition, a water barrel device, and a water spray device; the partition is "L" shaped, the front and back of the partition are closed to the inner wall of the box, the front and back ends of the vertical plate below are fixed to the frame plate in the box, and the horizontal plate is fixed to the vertical isolation plate of the box; the water barrel device includes a plurality of water barrel units, and the water barrel units are evenly distributed on the horizontal plate of the partition from front to back. The water spray device includes a plurality of spray heads, which are fixed to the vertical partition of the box and located above the side of the water barrel unit.

[0012] Furthermore, each water-vortex barrel unit includes a water-vortex barrel body, a rotating shaft, an upper cross, spiral blades, and a lower cross; the water-vortex barrel body is fixed on a horizontal plate of a partition, and its upper part is a cylinder and its lower part is an inverted cone; the crosshead of the upper cross is supported on the inner wall of the cylinder at the upper part of the water-vortex barrel body, and the crosshead of the lower cross is supported on the inner wall of the cylinder at the transition between the cylinder and the cone of the water-vortex barrel body; the rotating shaft is located in the water-vortex barrel body, and its upper and lower sections are respectively connected to the center holes of the upper cross and the lower cross; the spiral blades are fixedly mounted on the rotating shaft and are located between the upper cross and the lower cross.

[0013] Furthermore, each water barrel unit also includes a nut, a protective cover, and a thrust bearing; the thrust bearing is located on the boss of the upper cross, the protective cover covers the thrust bearing, the upper section of the rotating shaft passes through the holes of the thrust bearing and the protective cover, the nut is screwed onto the thread of the upper section of the rotating shaft and presses the protective cover; the center hole of the lower cross is sleeved on the small diameter of the lower section of the rotating shaft and is pressed tightly against the shoulder of the rotating shaft.

[0014] Furthermore, the drying adsorption chamber includes a plurality of adsorption baffles, which are arranged in a staggered manner in the drying adsorption chamber and tilted from top to bottom to form a labyrinth-like airflow channel. The adsorption baffle includes a baffle base and a sponge-like body, the baffle base is fixed on the inner wall of the drying adsorption chamber, and the sponge-like body is embedded and fixed in the baffle base.

[0015] The advantages of the present invention are as follows: 1. The paint spraying room has the function of preliminary capture and treatment of paint mist: the liquid splashed on the pedal surface flows to the water reservoir through the pedal, and the liquid falling from the arc surface of the water curtain plate can also flow to the water reservoir; the vortex groove can not only receive the liquid falling from the arc surface of the water curtain plate so that it can flow smoothly to the water reservoir and prevent splashing, but also can efficiently guide the paint mist in the paint spraying room to flow to the water vortex treatment room through the narrow gap after the preliminary treatment by the water curtain of the water curtain plate; 2. The function of the water vortex treatment room is the secondary capture and treatment of the paint mist, in which the water vortex bucket device is for the paint mist. The key assembly for secondary capture and treatment of mist; under the action of the water vortex spray device, the high-speed rotating spiral blades can increase the contact probability between the paint mist and the water flow, thereby greatly improving the capture efficiency of the paint mist; water drops fall into the water reservoir below, and at the same time, the paint mist in the water vortex treatment chamber flows from below to the dry adsorption chamber; 3. The high-speed airflow enters the dry adsorption chamber, and under the collision with the adsorption baffles distributed in a maze-like manner, the moisture in the airflow is fully absorbed by the sponge-like body, and waste liquid drops into the water reservoir to complete the purification and drying of the airflow. In short, the device of the present invention comprehensively considers the layout characteristics of the paint mist treatment space flow field through the vortex trough structure, water vortex barrel design, water baffle design, etc., and optimizes the design of the spatial flow field based on the gas-liquid multiphase fluid flow dynamics theory, which can effectively reduce the working energy consumption of the exhaust system while improving the exhaust gas capture efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1is a schematic diagram of a paint mist capture and treatment device of the present invention;

[0017] Figure 2 is a top view of the paint mist capture and treatment device of the present invention;

[0018] Figure 3 It is a schematic diagram of the assembly of the upper cross and the rotating shaft in the present invention;

[0019] Figure 4 It is a schematic diagram of the assembly of the lower cross and the rotating shaft in the present invention;

[0020] Figure 5 It is a structural schematic diagram of the adsorption baffle in the present invention;

[0021] Figure 6 It is a schematic diagram of the structure of the sponge-like body in the present invention.

[0022] In the figure: 1-box; 2-painting room; 3-pedal; 4-vortex groove; 5-water curtain plate; 6-water curtain spray device; 7-reinforcement rib; 8-water vortex treatment chamber; 9-partition; 10-water vortex barrel device; 11-water vortex spray device; 12-fan; 13-drying adsorption chamber; 14-adsorption baffle; 15-water reservoir; 16-upper cross; 17-water vortex cylinder body; 18-rotating shaft; 19-nut; 20-protective cover; 21-thrust bearing; 22-spiral blade; 23-lower cross; 24-baffle base; 25-sponge-like body. DETAILED DESCRIPTION

[0023] Example 1

[0024] like Figure 1 , Figure 2 As shown, the combined high-efficiency paint mist capturing and treating device of the present invention comprises a housing 1, a fan 12, a paint spraying room 2, a water vortex treatment room 8, a drying adsorption room 13 and a water reservoir 15; the paint spraying room 2, the water vortex treatment room 8, the drying adsorption room 13 and the water reservoir 15 are all arranged in the housing 1, wherein the paint spraying room 2, the water vortex treatment room 8 and the drying adsorption room 13 are arranged in sequence from left to right in the housing 1, and the water reservoir 15 is arranged in the lower part of the housing 1 and below both the water vortex treatment room 8 and the drying adsorption room 13; the fan 12 is arranged outside the housing 1, at the airflow outlet of the drying adsorption room 13.

[0025] When the fan 12 is working, it can generate high-speed airflow, bringing the paint mist in the spray booth 2 in the box body 1 into the water mist treatment chamber 8 and the drying adsorption chamber 13 for capture and treatment, and finally discharged into the atmosphere. The spray booth 2, the water mist treatment chamber 8, the drying adsorption chamber 13, and the water reservoir 15 in the box body 1 are distinguished according to the paint mist capture and treatment functions.

[0026] Example 2

[0027] like Figure 1 As shown, in the high-efficiency paint mist capture and treatment device of the present invention: the paint spray booth 2 includes a pedal 3, a water curtain plate 5, a water curtain spray device 6, and a reinforcing rib 7; the pedal 3 is located at the lower part of the paint spray booth 2 and is arranged downwardly and tilted from left to right, the water reservoir 15 is located on the right side of the pedal 3 and its highest liquid level is lower than the rightmost height of the pedal 3; the reinforcing rib 7 is fixed in the box body 1, and its top, front and back are all closed to the inner wall of the box body 1; the water curtain plate 5 is an arc-shaped structure, and its straight surface is fixed to the left side of the reinforcing rib 7, and the front and back of the water curtain plate 5 are all closed to the inner wall of the box body 1; the water curtain spray device 6 is fixed under the top of the box body 1, and it includes a plurality of spray heads, which are evenly arranged from front to back, and the spray heads are tilted, and their spray ports point to the upper part of the water curtain plate 5.

[0028] The pedal 3 is inclined at an angle of 5°-10°, so that the liquid splashed on the pedal surface can converge and flow to the water reservoir. The arc design of the water curtain plate 5 increases the surface area of ​​the water curtain plate, so that more liquid attached to it can enter the water reservoir. The arc of the water curtain plate 5 is convex, which is conducive to the liquid attached to it falling into the water reservoir.

[0029] The spray booth 2 is a paint spraying operation room, and also has the function of preliminary capture and treatment of paint mist: the liquid splashed on the pedal surface flows to the water reservoir through the pedal 3, and the liquid falling from the arc surface of the water curtain plate 5 can also flow to the water reservoir.

[0030] Example 3

[0031] like Figure 1 As shown, in the high-efficiency paint mist capture and treatment device of the present invention: the paint spraying room 2 also includes a vortex groove 4, which has a semicircular structure and is arranged at the lower side of the water curtain plate 5, and is arranged to be inclined to the right from bottom to top, and the front and rear of the vortex groove 4 are closed to the inner wall of the box body 1.

[0032] The concave circular surface of the vortex groove 4 faces the paint spraying room 2, and the inclination angle of the vortex groove 4 is 10°-20°. The upper part of the vortex groove 4 is located on the right side of the reinforcing rib and is higher than the bottom of the reinforcing rib to form a narrow gap, and the lower part is located on the left side of the reinforcing rib.

[0033] The semicircular structure and position arrangement of the vortex groove 4 are obtained through computational fluid dynamics optimization design analysis. Its significant advantage is that it can not only receive the liquid falling from the arc surface of the water curtain plate 5 so that it can flow smoothly to the water reservoir 15 and prevent splashing, but also efficiently guide the paint mist in the spray booth 2 to flow to the water treatment chamber 8 through the narrow gap after the preliminary treatment of the water curtain of the water curtain plate 5. In short, the vortex groove 4 makes the flow resistance of the paint mist small, and the water curtain has a strong ability to capture the paint mist.

[0034] Example 4

[0035] like Figure 1 , Figure 2, Figure 3 and Figure 4 As shown, in the high-efficiency paint mist capture and treatment device of the present invention: the water vortex treatment chamber 8 includes a partition 9, a water vortex bucket device 10, and a water vortex spray device 11; the partition 9 is "L"-shaped, and the front and rear of the partition 9 are closed to the inner wall of the box body 1, and the front and rear ends below its vertical plate are fixed to the frame plate in the box body 1, and its horizontal plate is fixed to the vertical isolation plate of the box body 1; the water vortex bucket device 10 includes a plurality of water vortex bucket units, and the water vortex bucket units are evenly distributed on the horizontal plate of the partition 9 from front to back. The water vortex spray device 11 includes a plurality of spray heads, which are fixed on the vertical partition of the box body 1 and are located above the side of the water vortex bucket unit.

[0036] Example 5

[0037] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, in the high-efficiency paint mist capture and treatment device of the present invention: each water vortex barrel unit includes a water vortex barrel body 17, a rotating shaft 18, an upper cross 16, a spiral blade 22, and a lower cross 23; the water vortex barrel body 17 is fixed on the horizontal plate of the partition 9, and its upper part is a cylinder and the lower part is an inverted cone; the crosshead of the upper cross 16 is supported on the cylindrical inner wall of the upper part of the water vortex barrel body 17, and the crosshead of the lower cross 23 is supported on the cylindrical inner wall at the transition point between the cylinder and the cone of the water vortex barrel body 17; the rotating shaft 18 is located in the water vortex barrel body 17, and its upper and lower sections are respectively connected to the center holes of the upper cross 16 and the lower cross 23; the spiral blade 22 is fixedly mounted on the rotating shaft 18 and is located between the upper cross 16 and the lower cross 23.

[0038] Each water barrel unit also includes a nut 19, a protective cover 20, and a thrust bearing 21; the thrust bearing 21 is located on the boss of the upper cross 16, the protective cover 20 covers the thrust bearing 21, the upper section of the rotating shaft 18 passes through the holes of the thrust bearing 21 and the protective cover 20, the nut 19 is screwed on the thread of the upper section of the rotating shaft 18 and presses the protective cover 20; the center hole of the lower cross 23 is sleeved on the small diameter of the lower section of the rotating shaft 18 and is pressed tightly on the shoulder of the rotating shaft 18.

[0039] The spraying direction of the spray head in the water jet spray device 11 points to the inner side of the water jet barrel device 10, ensuring that the water enters the water jet barrel body 17 after being sprayed out.

[0040] The function of the water-jet treatment chamber 8 is to perform secondary capture and treatment of the paint mist, wherein the water-jet barrel device 10 is a key assembly for the secondary capture and treatment of the paint mist. The water-jet barrel device 10 is fixed on the partition 9 to form a separation space. After the airflow enters the water-jet treatment chamber 8 from the paint spraying room 2, it flows into the water-jet barrel device 10 for secondary capture and treatment, and then enters the drying adsorption chamber 13. Under the action of the high-speed airflow, the spiral blades 22 can rotate with the rotating shaft 18. Under the action of the water-jet spray device 11, the high-speed rotating spiral blades 22 can increase the contact probability between the paint mist and the water flow, thereby greatly improving the capture efficiency of the paint mist. The water drops into the water reservoir below, and at the same time, the paint mist in the water-jet treatment chamber 8 flows from below to the drying adsorption chamber 13.

[0041] Example 6

[0042] like Figure 1 , Figure 2 , Figure 5 and Figure 6 As shown, in the high-efficiency paint mist capturing and processing device of the present invention: the drying adsorption chamber 13 includes a plurality of adsorption baffles 14, and the adsorption baffles 14 are staggeredly arranged in the drying adsorption chamber 13 and tilted from top to bottom to form a labyrinth-like airflow channel.

[0043] The adsorption baffle 14 includes a baffle base 24 and a sponge-like body 25 . The baffle base 24 is fixed on the inner wall of the drying adsorption chamber 13 , and the sponge-like body 25 is embedded and fixed in the baffle base 24 .

[0044] The sponge-like body 25 has a strong hydrophilicity and can fully absorb the moisture in the flowing airflow, thereby achieving drying of the airflow. The dried airflow is discharged from the outlet at the upper part of the drying adsorption chamber 13.

[0045] The function of the drying adsorption chamber 13 is to dry and dehydrate the moist airflow to prevent the water vapor or liquid droplets contaminated by the paint mist from being discharged into the atmosphere.

[0046] like Figure 1As shown, when the device is working, the fan 12 is first used to generate a high-speed airflow to suck the paint mist in the spray booth 2 into the water treatment chamber 8. In this process, the airflow mixed with the paint mist flows through the narrow gap formed by the water curtain plate 5 and the vortex groove 4, and flows to the water treatment chamber 8 after being initially captured and processed by the water curtain; at the same time, the liquid splashed on the pedal surface flows to the water reservoir through the pedal 3, and the liquid falling from the arc surface of the water curtain plate 5 also flows to the water reservoir. Then, the high-speed airflow introduces the paint mist into the water barrel device 10 for secondary capture and processing. The spiral blades 22 in the water barrel device 10 can effectively capture the paint mist mixed in the airflow when rotating at a high speed under the action of the airflow, and form waste water droplets that fall into the water reservoir. Finally, the high-speed airflow enters the drying adsorption chamber 13. Under the collision with the adsorption baffle 14 distributed in a labyrinth, the moisture in the airflow is fully absorbed by the sponge-like body 25, and forms waste liquid droplets that fall into the water reservoir, completing the purification and drying of the airflow. The device of the present invention comprehensively considers the layout characteristics of the spatial flow field of paint mist treatment through the vortex groove structure, water vortex barrel design, water baffle design, etc., and optimizes the design of the spatial flow field based on the gas-liquid multiphase fluid flow dynamics theory. It can effectively reduce the working energy consumption of the exhaust system while improving the exhaust gas capture efficiency.

Claims

1. A combined high-efficiency paint mist capture and treatment device, characterized by: It comprises a housing (1), a fan (12), a paint spraying room (2), a water jet treatment room (8), a drying adsorption room (13), and a water reservoir (15); the paint spraying room (2), the water jet treatment room (8), the drying adsorption room (13), and the water reservoir (15) are all arranged in the housing (1), wherein the paint spraying room (2), the water jet treatment room (8), and the drying adsorption room (13) are arranged in sequence from left to right in the housing (1), and the water reservoir (15) is arranged in the lower part of the housing (1) and below the water jet treatment room (8) and the drying adsorption room (13); the fan (12) is arranged outside the housing (1) and at the air flow outlet of the drying adsorption room (13); the paint spraying room (2) comprises a pedal (3), a water curtain The paint spraying room (2) comprises a plate (5), a water curtain spraying device (6), and a reinforcing rib (7); the pedal (3) is located at the lower part of the paint spraying room (2) and is arranged downwardly from left to right, the water reservoir (15) is located on the right side of the pedal (3) and its highest liquid level is lower than the rightmost height of the pedal (3); the reinforcing rib (7) is fixed in the box body (1), and its upper side, front side and rear side are all sealed with the inner wall of the box body (1); the water curtain plate (5) is an arc-shaped structure, and its straight surface is fixed to the left side of the reinforcing rib (7), and the front side and rear side of the water curtain plate (5) are all sealed with the inner wall of the box body (1); the water curtain spraying device (6) is fixed under the top of the box body (1), and it includes a plurality of spray heads, the spray heads are evenly arranged from front to back, the spray heads are arranged obliquely, and their spray ports are directed to The water curtain plate (5) is located at the upper part; the water treatment chamber (8) includes a partition (9), a water barrel device (10), and a water spray device (11); the partition (9) is "L"-shaped, and the front and rear sides of the partition (9) are closed to the inner wall of the box body (1), and the front and rear ends of the vertical plate below are fixed to the frame plate in the box body (1), and the horizontal plate is fixed to the vertical isolation plate of the box body (1); the water barrel device (10) includes a plurality of water barrel units, and the water barrel units are evenly distributed on the horizontal plate of the partition (9) from front to back; the water spray device (11) includes a plurality of spray heads, which are fixed to the vertical partition of the box body (1) and are located above the side of the water barrel unit; each water barrel unit includes a water barrel body (1 7), a rotating shaft (18), an upper cross (16), a spiral blade (22), and a lower cross (23); the water-jet cylinder (17) is fixed on a horizontal plate of the partition (9), the upper part of which is a cylinder and the lower part is an inverted cone; the cross head of the upper cross (16) is supported on the inner wall of the cylinder at the upper part of the water-jet cylinder (17), and the cross head of the lower cross (23) is supported on the inner wall of the cylinder at the transition between the cylinder and the cone of the water-jet cylinder (17); the rotating shaft (18) is located in the water-jet cylinder (17), and its upper and lower sections are respectively connected to the center holes of the upper cross (16) and the lower cross (23); the spiral blade (22) is fixedly mounted on the rotating shaft (18) and is located between the upper cross (16) and the lower cross (23);The drying adsorption chamber (13) comprises a plurality of adsorption baffles (14), which are arranged in a staggered manner in the drying adsorption chamber (13) and tilted from top to bottom to form a labyrinth-type airflow channel; the adsorption baffles (14) comprise a baffle base (24) and a sponge-like body (25), the baffle base (24) is fixed on the inner wall of the drying adsorption chamber (13), and the sponge-like body (25) is embedded and fixed in the baffle base (24).

2. The device according to claim 1, characterized in that: The pedal (3) has an inclination angle of 5°-10°.

3. The device according to claim 1, characterized in that: The water curtain plate (5) is arc-shaped, and the arc shape of the water curtain plate (5) is outwardly convex.

4. The device according to claim 1, characterized in that: The spray booth (2) further comprises a vortex groove (4), which has a semicircular structure and is arranged at the lower side of the water curtain plate (5) and is arranged to tilt rightward from bottom to top. The front and rear sides of the vortex groove (4) are both sealed with the inner wall of the box body (1).

5. The device according to claim 4, characterized in that: The concave circular surface of the vortex groove (4) faces the paint spraying room (2), the inclination angle of the vortex groove (4) is 10°-20°, the upper part of the vortex groove (4) is located on the right side of the reinforcing rib and is higher than the bottom of the reinforcing rib to form a narrow gap, and the lower part is located on the left side of the reinforcing rib.

6. The device according to claim 1, characterized in that: each The water barrel unit also includes a nut (19), a protective cover (20), and a thrust bearing (21); the thrust bearing (21) is located on a boss of the upper cross (16); the protective cover (20) covers the thrust bearing (21); the upper section of the rotating shaft (18) passes through holes of the thrust bearing (21) and the protective cover (20); the nut (19) is screwed onto the thread of the upper section of the rotating shaft (18) and presses the protective cover (20); the center hole of the lower cross (23) is sleeved on the small diameter of the lower section of the rotating shaft (18) and is pressed tightly onto the shaft shoulder of the rotating shaft (18).

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