A polytetrafluoroethylene material corner waste recycling system for new energy vehicles

Abstract

The application relates to the technical field of polytetrafluoroethylene particle recovery, in particular to a polytetrafluoroethylene material corner material recycling system for new energy vehicles, which comprises a cooling unit and a separation unit, the separation unit comprises a water tank, the cooling unit is installed at one end of the top of the water tank, the bottom of the cooling unit is provided with a bottom cover capable of being automatically opened, a crushing unit is arranged below the bottom cover in the upper part of the water tank, a bubble generating unit is arranged at the bottom of the water tank, a vibration guiding unit is arranged at the middle of the water tank, and a trapping unit for collecting dust and impurities is arranged at one end of the water tank away from the crushing unit. The bubbles float from the bottom of the water tank to the water surface, which is convenient for cooperation with the vibration guiding unit, improves the cleaning efficiency of the corner material particles, and after the work of the trapping unit, the impurities and dust on the water surface can be collected, the corner material particles and the impurities can be separated, and the recycling of the polytetrafluoroethylene corner material is realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of polytetrafluoroethylene particle recovery, in particular to a polytetrafluoroethylene material corner scrap recycling system for new energy vehicles. BACKGROUND

[0002] Polytetrafluoroethylene is a high-performance plastic known for its excellent chemical resistance, temperature resistance, wear resistance, and low friction coefficient. It is widely used in the field of new energy vehicles, such as battery systems, electric drive systems, and vehicle body components.

[0003] The existing polytetrafluoroethylene products will have a lot of unused corner scraps after production. The generated corner scraps usually contain high heat, which needs to be cooled to room temperature before being crushed. However, relying solely on natural cooling of the corner scraps requires a lot of time and the operator needs to transport the corner scraps to the recycling device for recycling. During transportation, the corner scraps can be cooled to a certain temperature, but they still cannot be cooled to room temperature, resulting in a decrease in the crushing efficiency of the crushing device in the recycling device. In addition, the corner scraps may be contaminated with impurities and dust during transportation, and the existing recycling device cannot effectively separate and recycle polytetrafluoroethylene and dust and other impurities. SUMMARY

[0004] The purpose of the embodiment of the present application is to provide a polytetrafluoroethylene material corner scrap recycling system for new energy vehicles to solve the problems in the background art.

[0005] To achieve the above-mentioned purpose, the embodiment of the present application provides the following technical scheme:

[0006] A polytetrafluoroethylene material corner scrap recycling system for new energy vehicles, comprising a cooling unit and a separation unit, the separation unit comprising a water tank, the cooling unit being installed at one end of the top of the water tank, the bottom of the cooling unit being provided with a bottom cover that can be automatically opened, the upper part of the water tank below the bottom cover being provided with a crushing unit, the bottom of the water tank being provided with a bubble generating unit, the middle part of the water tank being provided with a vibration guiding unit, and the end of the water tank away from the crushing unit being provided with a trapping unit for collecting dust and impurities.

[0007] Preferably, the cooling unit comprises a cooling tank, the top and bottom of the cooling tank are respectively provided with openings, the bottom opening of the cooling tank is provided with a bottom cover through a spring hinge, the end of the bottom cover away from the spring hinge is provided with a magnet, the water tank is made of metal, the end of the bottom cover away from the spring hinge is connected to the top of the water tank through the magnet, the bottom cover and the bottom opening of the cooling tank are provided with a sealing strip, and the upper part of the side of the cooling tank is provided with a water inlet pipe.

[0008] Preferably, the separation unit comprises a water tank, a spray head is arranged on the top of the crushing unit, the water tank is filled with water, a water pump is arranged on the outer side of the end of the water tank away from the cooling unit, and the water pump is connected to the water tank through a water pipe to supply water to the water inlet pipe and the spray head.

[0009] Preferably, the crushing unit comprises a cylindrical filter screen, a crushing shaft is arranged at the center of the filter screen, a plurality of crushing knives are arranged on the crushing shaft, a crushing motor is arranged on the outer side of the water tank to drive the crushing shaft, and an opening is arranged on the filter screen close to the bottom cover.

[0010] Preferably, the bubble generating unit comprises an air cavity, the air cavity is arranged on the bottom of the water tank, a plurality of air nozzles are arranged on the upper surface of the air cavity, and an air compressor is arranged on the outer side of the water tank and connected to the air cavity.

[0011] Preferably, the vibration guiding unit comprises a sieve plate, a limiting plate is arranged on the middle part of each end of the water tank, the horizontal height of the two limiting plates is different, the horizontal height of the limiting plate below the crushing unit is higher than that of the other limiting plate, the sieve plate is arranged on the two limiting plates through a return spring, a waterproof vibrator is arranged on the bottom of the limiting plate, and the power output end of the vibrator works towards the sieve plate through the limiting plate.

[0012] Preferably, the trapping unit comprises a cylindrical collecting bin, an installation port is arranged on the upper part of the side of the water tank, the collecting bin is arranged in the installation port, an opening is arranged on the upper part of the collecting bin, the bin wall of the collecting bin is provided with a water filtering hole, a trapping motor is arranged on the side of the water tank opposite to the installation port, a rotating plate is arranged in the water tank, the rotating plate is driven to rotate by the trapping motor, a plurality of arc-shaped plates are arranged on the outer edge of the rotating plate and sleeved on the outside of the collecting bin, and a handle is arranged on the end of the collecting bin away from the trapping motor.

[0013] Preferably, the horizontal height of the water pump is the same as that of the lowermost arc-shaped plate on the rotating plate, the water level in the water tank is higher than the horizontal height of the lowermost arc-shaped plate on the rotating plate and lower than the horizontal height of the bottom of the collecting bin.

[0014] Preferably, the top of the air cavity is arranged to be inclined, a discharge port is arranged below the side of the water tank close to the water pump, and the horizontal height of the upper surface of the air cavity gradually decreases towards the discharge port.

[0015] The embodiment of the present application has the following beneficial effects:

[0016] 1. The device cools the scrap material by water, after the temperature of the scrap material is reduced, the bottom cover at the bottom of the cooling unit is opened, the scrap material and water in the cooling unit fall into the crushing unit inside the water tank, the water falls into the water tank through the crushing unit, the water remains in the crushing unit for crushing, the qualified scrap material particles pass through the crushing unit into the vibration guide unit inside the water tank, since the vibration guide unit is below the water level, under the work of the vibration guide unit, the scrap material particles are constantly shaken by the vibration guide unit, at the same time, the bubble generating unit at the bottom of the water tank works, the bubbles float from the bottom of the water tank to the water surface, which is convenient for cooperation with the vibration guide unit to improve the cleaning efficiency of the scrap material particles, the scrap material particles will fall into the bottom of the water tank under the vibration of the vibration guide unit (the density of polytetrafluoroethylene is greater than water, so the scrap material particles will sink to the bottom of the water tank), at this time, the impurities and dust mixed in the scrap material particles float on the water surface after being washed by water, the impurities and dust on the water surface are collected by the work of the trapping unit, which is convenient for separating the scrap material particles and impurities, and realizing the recycling of polytetrafluoroethylene scrap material.

[0017] 2. The crushing motor of the device is started, the scrap material is continuously crushed by the crushing knife, which is convenient for crushing the scrap material into particles and passing through the filter screen, in the process of crushing the scrap material particles by the crushing knife, the water pump works, the water pump sends the water in the water tank into the spray head through the water delivery pipe, the spray head continuously sprays water on the scrap material particles in the filter screen to cool them, which avoids that the temperature of the scrap material particles is too high when the crushing knife crushes them, resulting in the reduction of the quality of the particles.

[0018] 3. The air compressor of the device works, which continuously compresses the gas in the air cavity, the gas enters the bottom of the water tank through the air jet nozzle to form bubbles, the bubbles gradually increase in size during the rising process, when the bubbles burst, strong impact force is generated, which can strip the dirt attached to the surface of the particles, thereby realizing the cleaning effect.

[0019] 4. The screen plate of the device is inclined, which is convenient for moving the scrap material particles to the direction of the trapping unit when vibrating, avoiding the accumulation of the scrap material particles at the same position at the bottom of the water tank.

[0020] 5. Under the work of the trapping motor, the device drives the multiple arc-shaped plates to continuously scoop the impurities on the water surface to the upper side of the collection bin, the water containing impurities enters the collection bin through the opening above the collection bin, since the horizontal surface is lower than the bottom of the collection bin, the water reenters the water tank through the water filter hole, and the impurities remain in the collection bin, since the collection bin is inserted between the multiple arc-shaped plates through the mounting port, when the crushing work is completed, the operator can take out the collection bin from the water tank through the handle to clean it. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1Structure diagram of the whole application Figure One ;

[0022] Figure 2 Structure diagram of the whole application Figure Two ;

[0023] Figure 3 Sectional view of the application Figure One ;

[0024] Figure 4 Sectional view of the application Figure Two ;

[0025] Figure 5 Structure diagram of the trapping unit;

[0026] Figure 6 Partial structure enlarged view of Figure 3 ;

[0027] Figure 7 Partial structure enlarged view of Figure 4 .

[0028] In the figure: 1, cooling unit; 2, cooling box; 3, water inlet pipe; 4, bottom cover; 5, spring hinge; 6, magnet; 7, separation unit; 8, water tank; 9, water pump; 10, water delivery pipe; 11, spray head; 12, crushing unit; 13, filter screen; 14, crushing knife; 15, crushing motor; 16, crushing shaft; 17, bubble generating unit; 18, air cavity; 19, air jet nozzle; 20, air compressor; 21, vibration guide unit; 22, sieve plate; 23, limiting plate; 24, return spring; 25, vibrator; 26, trapping unit; 27, collection bin; 28, handle; 29, trapping motor; 30, rotating plate; 31, arc plate; 32, discharge port. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the application.

[0030] Embodiment one

[0031] A new energy automobile polytetrafluoroethylene material corner waste recycling system, like Figures 1-7As shown, including cooling unit 1 and separation unit 7, the separation unit 7 includes a water tank 8, the cooling unit 1 is installed at one end of the top of the water tank 8, the bottom of the cooling unit 1 is provided with a bottom cover 4 that can be automatically opened, the upper part in the water tank 8 below the bottom cover 4 is provided with a crushing unit 12, the bottom of the water tank 8 is provided with a bubble generating unit 17, the middle part of the water tank 8 is provided with a vibration guide unit 21, and the end of the water tank 8 away from the crushing unit 12 is provided with a trapping unit 26 for collecting dust and impurities.

[0032] The operator puts the polytetrafluoroethylene scrap with high temperature into the cooling unit 1, and the scrap is preliminarily cooled by water. After the temperature of the scrap is reduced, the bottom cover 4 at the bottom of the cooling unit 1 is opened, and the scrap and water in the cooling unit 1 fall into the crushing unit 12 in the water tank 8. The water falls into the water tank 8 through the crushing unit 12, and the scrap is crushed in the crushing unit 12. The qualified scrap particles pass through the crushing unit 12 and enter the vibration guide unit in the water tank 8. Since the vibration guide unit is located below the water level line, under the action of the vibration guide unit, the scrap particles are constantly vibrated by the vibration guide unit, and at the same time, the bubble generating unit 17 at the bottom of the water tank 8 works. The bubbles float from the bottom of the water tank 8 to the water surface, which facilitates cooperation with the vibration guide unit and improves the cleaning efficiency of the scrap particles. The scrap particles will fall into the bottom of the water tank 8 (the density of polytetrafluoroethylene is greater than that of water, so the scrap particles will sink to the bottom of the water tank) under the vibration of the vibration guide unit. At this time, after being cleaned by water, the impurities and dust mixed in the scrap particles float on the water surface, and after the work of the trapping unit 26, the impurities and dust on the water surface are collected, which facilitates the separation of the scrap particles and the impurities, and realizes the recycling of the polytetrafluoroethylene scrap.

[0033] The cooling unit 1 includes a cooling tank 2, and the top and bottom of the cooling tank 2 are respectively provided with openings. The bottom cover 4 is installed at the bottom opening of the cooling tank 2 through a spring hinge 5. The end of the bottom cover 4 away from the spring hinge 5 is provided with a magnet 6. The water tank 8 is made of metal. The end of the bottom cover 4 away from the spring hinge 5 is connected to the top of the water tank 8 through the magnet 6. The bottom cover 4 and the bottom opening of the cooling tank 2 are provided with a sealing strip. The upper part of the side of the cooling tank 2 is provided with a water inlet pipe 3.

[0034] Since one end of the bottom cover 4 is linked with the bottom opening of the cooling tank 2 through the spring hinge 5 (the spring hinge 5 is a prior art, which facilitates the resetting of the bottom cover 4, and will not be described here), the other end of the bottom cover 4 is connected with the top of the water tank 8 through the magnet 6, and the bottom cover 4 and the bottom opening of the cooling tank 2 are provided with sealing strips, which can ensure the sealing of the bottom of the cooling tank 2 when the water inlet pipe 3 injects water into the cooling tank 2. Since the scrap particles are put into the cooling tank 2, and water is continuously injected into the cooling tank 2 for cooling, the pressure of the water and the scrap in the cooling tank 2 increases continuously until the pressure is greater than the adsorption force of the magnet 6 and the water tank 8, and the bottom cover 4 can be automatically opened. Since water is continuously injected into the cooling tank 2, the scrap can be cooled. When the water and the scrap fall into the water tank 8, the pressure of the bottom cover 4 disappears, and under the action of the spring hinge 5, the bottom cover 4 can be closed again to ensure that the magnet 6 is adsorbed on the water tank 8 again to cool the subsequent scrap.

[0035] The separation unit 7 comprises a water tank 8, a spray head 11 is arranged on the top of the water tank 8 above the crushing unit 12, the water tank 8 is filled with water, and a water pump 9 is arranged outside one end of the water tank 8 away from the cooling unit 1. The water pump 9 respectively sends the water in the water tank 8 to the water inlet pipe 3 and the spray head 11 through the water conveying pipe 10. The crushing unit 12 comprises a cylindrical filter screen 13, a crushing shaft 16 is arranged at the center of the filter screen 13, a plurality of groups of crushing knives 14 are arranged on the crushing shaft 16, a crushing motor 15 is arranged outside the water tank 8 to drive the crushing shaft 16, and an opening is arranged on the filter screen 13 close to the bottom cover 4.

[0036] The horizontal height of the filter screen 13 is higher than the water level in the water tank 8. When the scrap and water fall into the water tank 8 from the cooling tank 2, they first enter the filter screen 13 through the opening on the filter screen 13, the water penetrates through the filter screen 13 and merges into the water in the water tank 8, and the scrap is intercepted by the filter screen 13. The crushing motor 15 is started, and the scrap is crushed into particles by the crushing knives 14, which pass through the filter screen 13. In the process of crushing the scrap by the crushing knives 14, the water pump 9 works, and the water pump 9 sends the water in the water tank 8 to the spray head 11 through the water conveying pipe 10. The spray head 11 continuously sprays water on the scrap particles in the filter screen 13 to cool them, so as to avoid that the temperature of the scrap particles is too high when the crushing knives 14 crush them, which reduces the quality of the particles. The water pump 9 can also slowly inject water into the cooling tank 2 through the water conveying pipe 10 to cool the scrap.

[0037] The bubble generating unit 17 comprises an air cavity 18, which is arranged at the bottom of the water tank 8. A plurality of air nozzles 19 are arranged on the upper surface of the air cavity 18. An air compressor 20 is arranged outside the water tank 8 and communicates with the air cavity 18.

[0038] When the leftover particles fall into the water, the air compressor 20 works to compress air into the air cavity 18, and the air enters the bottom of the water tank 8 through the air nozzle 19 to form air bubbles. The air bubbles gradually increase in size during the rising process, and when the air bubbles burst, a strong impact force is generated, which can strip the dirt attached to the surface of the particles, thereby achieving the cleaning effect.

[0039] The vibration guide unit 21 comprises a sieve plate 22, and the middle part of the water tank 8 at both ends is respectively provided with a limiting plate 23. The horizontal height of the two limiting plates 23 is different, and the horizontal height of the limiting plate 23 below the crushing unit 12 is higher than that of the other limiting plate 23. The bottom of the sieve plate 22 is inclinedly arranged on the two limiting plates 23 through a reset spring 24, and the bottom of the limiting plate 23 is provided with a waterproof vibrator 25. The power output end of the vibrator 25 works towards the sieve plate 22 through the limiting plate 23.

[0040] The leftover particles sinking in the water will first fall on the sieve plate 22. Through the work of the vibrator 25, the sieve plate 22 can vibrate to shake the leftover particles on the sieve plate 22. The leftover particles will continue to fall to the bottom of the water tank 8 through the sieve plate 22, but the sieve plate 22 can slow down the falling speed of the leftover particles and cooperate with the cleaning of the air bubbles to ensure that the leftover particles and impurities are completely separated. Since the sieve plate 22 is inclinedly arranged, it is convenient to move the leftover particles to the direction of the trapping unit 26 during vibration, so as to avoid the accumulation of the leftover particles at the same position at the bottom of the water tank 8.

[0041] The top of the air cavity 18 is inclinedly arranged, the lower side of the water tank 8 close to the water pump 9 is provided with a discharge port 32, and the horizontal height of the upper surface of the air cavity 18 gradually decreases towards the discharge port 32.

[0042] When the crushing work is completed, the water pump 9 stops working, the water in the water tank 8 can drive the leftover particles on the upper surface of the air cavity 18 at the bottom of the water tank 8 to be discharged from the discharge port 32 by opening the discharge port 32, and the external filtering device is convenient for the recycling work of the leftover particles and the subsequent reuse of the leftover particles.

[0043] Example two

[0044] On the basis of example one, such as Figure 5As shown, the trapping unit 26 includes a cylindrical collecting bin 27, the upper side of the water tank 8 is provided with a mounting opening, the collecting bin 27 is arranged in the mounting opening, the upper portion of the collecting bin 27 is provided with an opening, the bin wall of the collecting bin 27 is provided with a water filtering hole, the side of the water tank 8 opposite to the mounting opening is provided with a trapping motor 29, the inside of the water tank 8 is provided with a rotating plate 30, the rotating plate 30 is driven to rotate by the trapping motor 29, the outer edge of the rotating plate 30 is provided with a plurality of arc-shaped plates 31 sleeved outside the collecting bin 27, and the end of the collecting bin 27 away from the trapping motor 29 is provided with a handle 28. The water pump 9 is at the same horizontal height as the lowermost arc-shaped plate 31 on the rotating plate 30, the water level line in the inside of the water tank 8 is higher than the horizontal height of the lowermost arc-shaped plate 31 on the rotating plate 30, and is lower than the horizontal height of the bottom of the collecting bin 27.

[0045] Since the edge and corner material particles sink to the bottom of the water tank 8 and the dust and other impurities float on the water surface, the water pump 9 is located at the end of the water tank 8 close to the trapping unit 26, under the action of the water pump 9, the water in the inside of the water tank 8 moves to the direction of the water pump 9, thereby driving the impurities on the water surface to flow to the trapping unit 26, under the action of the trapping motor 29, the plurality of arc-shaped plates 31 constantly scoop the impurities on the water surface to the upper side of the collecting bin 27 through the rotating plate 30, the water containing the impurities enters the collecting bin 27 through the opening above the collecting bin 27, since the horizontal plane is lower than the bottom of the collecting bin 27, the water reenters the inside of the water tank 8 through the water filtering hole, and the impurities remain in the inside of the collecting bin 27. Since the collecting bin 27 is inserted between the plurality of arc-shaped plates 31 through the mounting opening, when the crushing work is completed, the operator can easily take out the collecting bin 27 from the inside of the water tank 8 through the handle 28 for cleaning.

[0046] The above examples are only exemplary embodiments of the present application and are not used to limit the present application, the protection scope of the present application is defined by the claims. Those skilled in the art can make various modifications or equivalent replacements to the present application within the spirit and protection scope of the present application, and such modifications or equivalent replacements are also regarded as falling within the protection scope of the present application.

Claims

1. A polytetrafluoroethylene material corner scrap recycling system for new energy vehicles, characterized in that, The application relates to a cooling unit (1) and a separation unit (7), wherein the cooling unit (1) is installed at one end of the top of a water tank (8), the bottom of the cooling unit (1) is provided with a bottom cover (4) capable of being automatically opened, the upper part in the water tank (8) is located below the bottom cover (4) and is provided with a crushing unit (12), the bottom of the water tank (8) is provided with a bubble generating unit (17), the middle part in the water tank (8) is provided with a vibration guiding unit (21), one end of the water tank (8) away from the crushing unit (12) is provided with a trapping unit (26) for collecting dust and impurities, the outside of one end of the water tank (8) away from the cooling unit (1) is provided with a water pump (9), the trapping unit (26) comprises a cylindrical collecting bin (27), the upper part of the side of the water tank (8) is provided with a mounting port, the collecting bin (27) is arranged in the mounting port, the upper part of the collecting bin (27) is provided with an opening, the bin wall of the collecting bin (27) is provided with water filtering holes, the side of the water tank (8) opposite to the mounting port is provided with a trapping motor (29), the inside of the water tank (8) is provided with a rotating plate (30), the rotating plate (30) is driven to rotate by the trapping motor (29), the outer edge of the rotating plate (30) is provided with a plurality of arc-shaped plates (31) sleeved outside the collecting bin (27), one end of the collecting bin (27) away from the trapping motor (29) is provided with a handle (28), the water pump (9) has the same horizontal height as the lowermost arc-shaped plate (31) on the rotating plate (30), the water level line in the water tank (8) is higher than the horizontal height of the lowermost arc-shaped plate (31) on the rotating plate (30) and is lower than the horizontal height of the bottom of the collecting bin (27).

2. The polytetrafluoroethylene material corner waste recycling system for a new energy vehicle according to claim 1, characterized in that, The cooling unit (1) comprises a cooling tank (2), the top and the bottom of the cooling tank (2) are respectively provided with openings, the bottom opening of the cooling tank (2) is provided with a bottom cover (4) through a spring hinge (5), one end of the bottom cover (4) away from the spring hinge (5) is provided with a magnet (6), the water tank (8) is made of metal, one end of the bottom cover (4) away from the spring hinge (5) is connected to the top of the water tank (8) through the magnet (6), the bottom cover (4) and the bottom opening of the cooling tank (2) are provided with a sealing strip, and the upper part of the side of the cooling tank (2) is provided with a water inlet pipe (3).

3. The polytetrafluoroethylene material corner waste recycling system for a new energy vehicle according to claim 2, characterized in that, The separation unit (7) comprises a water tank (8), the top of the water tank (8) is provided with a spraying head (11) above the crushing unit (12), the inside of the water tank (8) is filled with water, and the water pump (9) respectively delivers the water in the water tank (8) to the water inlet pipe (3) and the spraying head (11) through a water delivery pipe (10).

4. The polytetrafluoroethylene material corner waste recycling system for a new energy vehicle according to claim 3, characterized in that, The crushing unit (12) comprises a columnar filter screen (13), the axis of the filter screen (13) is provided with a crushing shaft (16), a plurality of groups of crushing knives (14) are arranged on the crushing shaft (16), the outside of the water tank (8) is provided with a crushing motor (15) for driving the crushing shaft (16), and the filter screen (13) is provided with an opening close to the bottom cover (4).

5. The polytetrafluoroethylene material corner waste recycling system for a new energy vehicle according to claim 4, characterized in that, The bubble generating unit (17) comprises an air cavity (18) arranged at the bottom of the water tank (8), and a plurality of air nozzles (19) are arranged on the upper surface of the air cavity (18); and an air compressor (20) is arranged outside the water tank (8) and is communicated with the air cavity (18).

6. The polytetrafluoroethylene material corner waste recycling system for a new energy vehicle according to claim 5, characterized in that, The vibration guiding unit (21) comprises a sieve plate (22), and the middle portions of the two ends of the water tank (8) are respectively provided with limiting plates (23) with different horizontal heights; the horizontal height of the limiting plate (23) below the crushing unit (12) is higher than that of the other limiting plate (23); the sieve plate (22) is obliquely arranged on the two limiting plates (23) through a reset spring (24); and a waterproof vibrator (25) is arranged at the bottom of the limiting plate (23), and the power output end of the vibrator (25) works towards the sieve plate (22) through the limiting plate (23). 7.The new energy vehicle polytetrafluoroethylene material corner cutting system of claim 6, wherein, The top of the air cavity (18) is obliquely arranged, a discharge port (32) is arranged below the side of the water tank (8) close to the water pump (9), and the horizontal height of the upper surface of the air cavity (18) gradually decreases towards the discharge port (32).

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