Self-starting anti-backflow hydraulic machinery air entrainment and corrosion reduction device

Abstract

The invention relates to the technical field of aeration and cavitation reduction, and provides a self-starting anti-backflow hydraulic mechanical aeration and cavitation reduction device which comprises an air supply assembly and an aeration assembly, the aeration assembly comprises an aeration box, a main valve and a pressure driving component, the main valve and the pressure driving component are arranged in the aeration box, the aeration box is provided with an airflow inlet and an equipment connecting pipe, and the airflow inlet is connected with the air supply assembly; the equipment connecting pipe is connected with hydraulic mechanical equipment; the equipment connecting pipe comprises an equipment air inlet pipe and a backflow pipe, the equipment air inlet pipe is communicated with the airflow inlet to form an aeration channel, and the equipment air inlet pipe is provided with a check valve; one end of the self-starting channel is closed, and the other end of the self-starting channel is communicated with the backflow pipe; the main valve is used for controlling on-off of the aeration channel, and the pressure driving component is used for directly or indirectly controlling opening and closing of the main valve according to the pressure in the self-starting channel. The system can rapidly and automatically respond to carry out aeration, manual operation is not needed, the dynamic operation requirement can be well met, and the overall operation efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of aeration cavitation reduction, and in particular to a self-starting anti-backflow hydraulic mechanical aeration cavitation reduction device. Background Art

[0002] Hydraulic machinery is the "heart" of a hydroelectric power station, and cavitation is the "cancer" of hydraulic machinery. Hydraulic machinery is widely used in hydropower, irrigation, industrial water supply and other fields. The core of its operation is to achieve effective energy transfer and conversion in high-speed flowing water. However, in actual operation, especially under high flow conditions, the pressure field changes rapidly and cavitation occurs frequently. The essence of cavitation is that when the fluid pressure drops to the saturated steam pressure at the corresponding temperature, the liquid produces cavitation bubbles, which collapse after flowing through the local high-pressure area, forming a local impact force, leading to erosion (cavitation) of the metal surface. Cavitation not only easily causes vibration in the hydraulic machinery system, but also causes impact on the components with higher precision requirements in the system, causing various parts of the hydraulic machinery to be fatigued and damaged by periodic load changes due to the pressure pulsation caused by cavitation.

[0003] In order to alleviate the above problems, aeration cavitation reduction technology came into being. By introducing an appropriate amount of gas into the water flow, the rupture impact of cavitation bubbles can be effectively buffered, and the damage of cavitation to the mechanical surface can be reduced. Although aeration technology has been widely used in many industries such as environmental protection, industrial manufacturing, agriculture, and food processing, the existing aeration devices used in hydraulic machinery still have many technical limitations in actual operation. For example, the existing aeration devices generally require manual operation. When the working conditions change rapidly, the device is difficult to respond in time and cannot meet the dynamic operation requirements. This startup method is time-consuming and labor-intensive, and affects the overall operating efficiency. Summary of the invention The object of the present invention is to provide a self-starting anti-backflow hydraulic mechanical aeration cavitation reduction device to solve the above-mentioned defects of the existing aeration cavitation reduction device.

[0004] The present invention is achieved through the following technical solutions: A self-starting anti-backflow hydraulic machinery aeration cavitation reduction device comprises an air supply component and an aeration component, wherein the aeration component comprises an aeration box and a main valve and a pressure driving component arranged inside the aeration box, wherein the aeration box is provided with an air flow inlet and an equipment connecting pipe, wherein the air flow inlet is connected to the air supply component, and the equipment connecting pipe is connected to the hydraulic machinery equipment; The equipment connecting pipe includes an equipment air inlet pipe and a return pipe. The equipment air inlet pipe is connected with the air flow inlet to form an aeration channel. The equipment air inlet pipe is provided with a check valve. A self-starting channel is provided inside the aeration box, one end of which is closed and the other end is connected with the return pipe. The main valve is used to control the on-off of the aeration channel, and the pressure drive component is used to directly or indirectly control the opening and closing of the main valve according to the pressure in the self-starting channel.

[0005] Optionally, the pressure-driven component includes a moving piston, a piston rod and a first elastic member, the piston rod is slidably arranged and one end of the piston rod is fixedly connected to the moving piston, and when the pressure in the self-starting channel increases, the moving piston is squeezed and moved, and the first elastic member is used to reset the moving piston after the pressure in the self-starting channel is restored; The main valve comprises a main valve core, a main valve stem and a second elastic member. The main valve core closes the aeration channel under the action of the second elastic member. The main valve stem is slidably arranged and one end is fixedly connected to the main valve core. The other end of the main valve stem is connected to the other end of the piston rod through a transmission component, so that when the moving piston is pressed and moved, the main valve core is driven to move and squeeze the second elastic member to open the aeration channel, and when the moving piston is reset, the main valve core is driven to move in the opposite direction to re-close the aeration channel.

[0006] Optionally, the top end of the piston rod is fixedly connected to the movable piston, and the movable piston moves downward when pressurized; the second elastic member is arranged at the upper end of the main valve core, and the upper end of the main valve stem is fixedly connected to the main valve core; the lower end of the main valve stem is connected to the lower end of the piston rod through the transmission component.

[0007] Optionally, the transmission component includes a lever and a support seat, the support seat is fixed, the middle part of the lever is rotatably connected to the support seat, both ends of the lever are provided with waist-shaped grooves, and a pin is slidably arranged in the waist-shaped groove. The pin at one end of the lever is hinged to the piston rod, and the pin at the other end of the lever is hinged to the main valve stem.

[0008] Optionally, a piston cavity cooperating with the movable piston is provided inside the self-starting channel, a plurality of elastic balls are provided on the side wall of the movable piston along the circumferential direction, and a plurality of groups of grooves cooperating with the elastic balls are provided on the side wall of the piston cavity along the axial direction.

[0009] Optionally, the pressure-driven component is a pressure sensor, and the main valve is a solenoid valve.

[0010] Optionally, the aeration channel is provided with a secondary valve after the main valve, the secondary valve comprising a secondary valve core and a third elastic member sequentially arranged along the gas flow direction in the aeration channel, and the secondary valve core closes the aeration channel under the action of the third elastic member.

[0011] Optionally, the air injection channel between the auxiliary valve and the check valve is concave.

[0012] Optionally, the air supply assembly includes an air injection pipeline and an air compressor, a pressure regulating tank, a pneumatic ball valve and an electromagnetic flowmeter arranged in sequence on the air injection pipeline, and the air outlet end of the air injection pipeline is connected to the air flow inlet; the pressure regulating tank is provided with a pressure gauge and an exhaust valve.

[0013] Optionally, the aeration assembly is mounted on a three-dimensional coordinate frame to achieve position adjustment in three directions perpendicular to each other.

[0014] The technical solution of the present invention has at least the following advantages and beneficial effects: In the present invention, the equipment connecting pipe connecting the hydraulic machinery equipment is divided into an equipment air inlet pipe and a return pipe. The equipment air inlet pipe is connected to the air flow inlet to form an aeration channel for aerating the inside of the hydraulic machinery equipment. The return port is connected to the self-starting channel, that is, it is connected to the inside of the hydraulic machinery equipment. When the internal working conditions of the hydraulic machinery equipment change, the pressure driving component can directly or indirectly control the opening and closing of the main valve according to the pressure in the self-starting channel, thereby realizing rapid aeration of the inside of the hydraulic machinery equipment or closing the aeration channel. It can be seen that in the present invention, when the internal working conditions of the hydraulic machinery equipment change, the main valve can respond quickly and automatically to aerate without manual operation, which can well meet the dynamic operation requirements and improve the overall operation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of the structure of a self-starting anti-backflow hydraulic mechanical aeration and cavitation reduction device provided by the present invention; Figure 2 is a three-dimensional cross-sectional view of an aeration component; Figure 3 is a plan cross-sectional view of the aeration component; Figure 4 Schematic diagram of the matching relationship between the elastic ball and the slot; Figure markings: 1-air compressor, 2-pressure regulating tank, 3-pressure gauge, 4-exhaust valve, 5-pneumatic ball valve, 6-electromagnetic flowmeter, 7-air supply assembly, 8-aeration pipeline, 9-aeration assembly, 10-three-dimensional coordinate frame, 11-universal caster, 12-lifting device, 13-lever, 14-main valve core, 15-movable piston, 16-top cover, 17-auxiliary valve core, 18-check valve, 19-support seat, 20-main valve stem, 21-piston rod, 22-air flow inlet, 23-reflux pipe, 24-equipment air inlet pipe, 25-U-shaped tube, 26-first sealing felt ring, 27-first gear slot, 28-second gear slot, 29-third gear slot, 30-elastic ball, 31-first elastic member, 32-second elastic member, 33-third elastic member, 34-second sealing felt ring. DETAILED DESCRIPTION

[0016] Example 1 refer to Figure 1A self-starting anti-backflow hydraulic mechanical aeration and cavitation reduction device includes an air supply component 7 and an aeration component 9. The aeration component 9 includes an aeration box and a main valve and a pressure-driven component arranged inside the aeration box. It is easy to understand that in actual applications, the aeration box can be composed of multiple boxes according to actual needs. The aeration box is provided with an air flow inlet 22 and an equipment connecting pipe. The air flow inlet 22 is connected to the air supply component 7, that is, the gas transported by the air supply component 7 enters the interior of the aeration box from the air flow inlet 22.

[0017] In practical applications, the equipment connection pipe is connected to the hydraulic mechanical equipment, refer to Figure 2 and Figure 3 The equipment connection pipe includes an equipment air inlet pipe 24 and a return pipe 23. In this embodiment, the return pipe 23 is sleeved on the outside of the equipment air inlet pipe 24 (of course, it can also be separately arranged in other embodiments). The equipment air inlet pipe 24 is connected with the air flow inlet 22 to form an aeration channel for aerating the inside of the hydraulic machinery equipment. A check valve 18 (i.e., a one-way valve that allows gas to enter the inside of the hydraulic machinery equipment but limits the fluid from entering the aeration channel from the inside of the hydraulic machinery equipment) is provided at the equipment air inlet pipe 24; a self-starting channel is provided inside the aeration box, one end of which is closed and the other end is connected with the return pipe 23, that is, connected to the inside of the hydraulic machinery equipment. The main valve is used to control the on-off of the aeration channel. When the working conditions inside the hydraulic machinery equipment change, the pressure drive component can directly or indirectly control the opening and closing of the main valve according to the pressure in the self-starting channel, thereby realizing the rapid aeration of the inside of the hydraulic machinery equipment through the aeration channel or closing the aeration channel. It can be seen that in the present invention, when the internal working conditions of the hydraulic machinery equipment change, the main valve can respond quickly and automatically without manual operation, which can well meet the dynamic operation requirements and improve the overall operation efficiency.

[0018] In this embodiment, the pressure-driven component directly controls the opening and closing of the main valve through a mechanical structure, so that no external power is required. Specifically, the pressure-driven component includes a mobile piston 15, a piston rod 21 and a first elastic member 31 (a spring is selected in this embodiment), the piston rod 21 is slidably arranged (it should be understood that the piston rod 21 should take sealing measures, such as sealing through a fixedly arranged first sealing felt ring 26), one end of the piston rod 21 is fixedly connected to the mobile piston 15, when the pressure in the self-starting channel increases (that is, when the pressure inside the hydraulic machinery equipment increases), the water flow will enter the self-starting channel from the reflux pipe 23, and this process will further compress the gas inside the self-starting channel, thereby squeezing the mobile piston 15 and moving it. The first elastic member 31 is used to reset the mobile piston 15 after the pressure in the self-starting channel is restored.

[0019] The main valve comprises a main valve core 14, a main valve stem 20 and a second elastic member 32 (a spring is selected in this embodiment). The main valve core 14 closes the aeration channel under the action of the second elastic member 32. The main valve stem 20 is slidably arranged (it should be understood that the main valve stem 20 should adopt sealing measures, such as sealing by a fixedly arranged second sealing felt ring 34). One end of the main valve stem 20 is fixedly connected to the main valve core 14. The other end of the main valve stem 20 is connected to the other end of the piston rod 21 through a transmission component, so that when the moving piston 15 is pressed and moved, the main valve core 14 is driven to move and squeeze the second elastic member 32, so that the aeration channel is opened, and when the moving piston 15 is reset, the main valve core 14 is driven to move in the opposite direction to reclose the aeration channel.

[0020] As an option, the various parts of the pressure-driven component and the various parts of the main valve of this embodiment are arranged as follows: the top end of the piston rod 21 is fixedly connected to the movable piston 15, and the movable piston 15 moves downward when under pressure. Furthermore, a top cover 16 is provided above the movable piston 15, and the top cover 16 limits the initial position of the movable piston 15. In this embodiment, the top cover 16 is connected to the aeration box by threads; the second elastic member 32 is provided at the upper end of the main valve core 14, the upper end of the main valve stem 20 is fixedly connected to the main valve core 14, and the lower end of the main valve stem 20 is connected to the lower end of the piston rod 21 by a transmission member. Based on the above, it is easy to understand that the second elastic member 32 applies downward pressure to the main valve core 14, so that the main valve core 14 closes the aeration channel, and the main valve stem 20 and the main valve core 14 move upward and squeeze the second elastic member 32 to open the aeration channel. In other embodiments, the various parts of the pressure-driven component and the various parts of the main valve can of course also be arranged in other ways. For example, the piston rod 21 and the main valve stem 20 are arranged in the opposite direction to the present embodiment (i.e., arranged upward), and when the pressure in the self-starting channel increases, the piston 15 is squeezed and moved to move upward. Since the main valve core 14 in this embodiment moves upward to open the aeration channel, it should be understood that in this embodiment, the transmission component should realize the same-direction movement of the main valve stem 20 and the piston rod 21. The specific implementation method is not limited. For example, the main valve stem 20 and the piston rod 21 are fixedly connected by a connecting piece.

[0021] On the basis of the above, it is easy to understand that the function of the transmission component in this embodiment is to realize the movement of the piston rod 21 and the main valve stem 20 in opposite directions, that is, when the piston rod 21 moves downward, it drives the main valve stem 20 to move upward, and when the piston rod 21 moves upward, it drives the main valve stem 20 to move downward. As an option, the transmission component in this embodiment includes a lever 13 and a support seat 19, the support seat 19 is fixedly arranged, the middle part of the lever 13 is rotatably connected to the support seat 19, both ends of the lever 13 are provided with a waist-shaped groove, and a pin shaft is slidably arranged in the waist-shaped groove, the pin shaft at one end of the lever 13 is hinged to the piston rod 21, and the pin shaft at the other end of the lever 13 is hinged to the main valve stem 20. In other embodiments, the transmission component can of course also adopt other structures, for example, the lower end of the piston rod 21 and the lower end of the main valve stem 20 are respectively fixedly connected to a rack, a rotatable gear is fixedly arranged between the two racks, and the two racks are respectively meshed with the gears.

[0022] In this embodiment, a piston cavity is provided inside the self-starting channel to cooperate with the moving piston 15. Figure 4 , the side wall of the movable piston 15 is provided with a plurality of elastic balls 30 along the circumferential direction, and the side wall of the piston cavity is provided with a plurality of groups of slots that can cooperate with the elastic balls 30 one by one along the axial direction. It is worth noting that, with such a configuration, the movable piston 15 can move downward to different positions according to the actual pressure range in the self-starting channel, so that the elastic balls 30 cooperate with the corresponding groups of slots, so that the main valve is kept at different openings according to the actual pressure range in the self-starting channel, thereby achieving the effect of stable air mixing. As an option, this embodiment is provided with three groups of slots from top to bottom, so that the opening of the main valve has three gears. For the convenience of description, the three groups of slots are defined as the first gear slot 27, the second gear slot 28 and the third gear slot 29 from top to bottom. It is easy to understand that when the elastic balls 30 cooperate with the third gear slot 29, the main valve opening reaches the maximum.

[0023] As an option, the elastic ball 30 can be arranged in a manner that a mounting hole is provided on the side wall of the moving piston 15, a spring is arranged in the mounting hole, the end of the spring is fixedly connected to the ball, and the ball can be retracted into the mounting hole when being squeezed. In other embodiments, the elastic ball 30 can also be replaced by a spring plunger, that is, a mounting hole is also provided on the side wall of the moving piston 15, a spring plunger is installed in the mounting hole, and only the head of the spring plunger is exposed from the mounting hole, so as to ensure that the head of the spring plunger can be retracted into the mounting hole when being squeezed, thereby ensuring that the moving piston 15 can move normally.

[0024] Reference again Figure 2 and Figure 3The aeration channel is provided with an auxiliary valve after the main valve. The auxiliary valve includes an auxiliary valve core 17 and a third elastic member 33 (a spring is selected in this embodiment) arranged in sequence along the gas flow direction in the aeration channel. The auxiliary valve core 17 closes the aeration channel under the action of the third elastic member 33. It is worth noting that the auxiliary valve also acts as a one-way valve. When aeration occurs, the gas flows into the hydraulic machinery equipment. When the gas pressure at the front end of the auxiliary valve exceeds the pressing force of the third elastic member 33, the auxiliary valve core 17 moves to open the aeration channel. When the fluid in the hydraulic machinery equipment wants to flow back into the front end of the auxiliary valve, it is blocked by the auxiliary valve core 17 and cannot flow back.

[0025] Furthermore, the aeration channel between the auxiliary valve and the check valve 18 is concave, which further prevents the backflow of the fluid in the hydraulic machinery. It can be seen that the present invention realizes triple check through the auxiliary valve core 17, the check valve 18 and the concave structure, which can effectively prevent the backflow phenomenon in the aeration channel and ensure the stability and safety of the device operation. As an option, the above-mentioned concave shape in this embodiment is a U shape as shown in the figure. In actual application, this part of the aeration channel can be replaced by a U-shaped tube 25. In other embodiments, it can also be other forms, such as a concave semicircular shape.

[0026] Reference again Figure 1 In this embodiment, the air supply component 7 includes an air injection pipeline 8 and an air compressor 1, a pressure stabilizing tank 2, a pneumatic ball valve 5 and an electromagnetic flowmeter 6 which are arranged on the air injection pipeline 8 in sequence. The air outlet end of the air injection pipeline 8 is connected to the air flow inlet 22; the pressure stabilizing tank 2 is provided with a pressure gauge 3 and an exhaust valve 4.

[0027] It is worth noting that due to the pressure fluctuation of the airflow generated by the air compressor 1, a stable and flow-controllable airflow is required to ensure the smooth progress of aeration cavitation reduction. The set pressure stabilizing tank 2 is used to alleviate the pressure fluctuation and ensure the stable operation of the entire system. The pressure gauge 3 and exhaust valve 4 equipped on the pressure stabilizing tank 2 are responsible for monitoring and adjusting the pressure of the gas in the tank. In practical applications, the pneumatic ball valve 5 and the electromagnetic flowmeter 6 can be controlled by the control system to achieve precise flow regulation and intelligent control to adapt to various complex working environments.

[0028] In addition, the pneumatic ball valve 5 has the ability to adjust the cross-sectional area, so it can provide airflows of different flow rates. When the airflow passes through the electromagnetic flowmeter 6, the flow rate can be accurately measured. At the same time, since the gas flow rate out of the surge tank 2 is constant, the cross-sectional areas of the electromagnetic flowmeter 6 and the aeration pipe are fixed and known, according to the flow formula Q=V1A1=V2A2 (where Q represents the gas flow rate out of the surge tank, V1 is the flow rate through the electromagnetic flowmeter 6, and A1 is the cross-sectional area of ​​the electromagnetic flowmeter 6; V2 is the flow rate through the equipment intake pipe 24, and A2 is the cross-sectional area of ​​the equipment intake pipe 24), the actual aeration speed can be obtained. The airflow velocity can also be adjusted according to actual use requirements. Specifically, according to the aeration formula Vtotal=AVT (where Vtotal represents the aeration amount, A represents the cross-sectional area, V represents the gas flow rate, and T is the flow time), the actual aeration amount can be calculated, thereby achieving accurate quantitative aeration.

[0029] In this embodiment, the aeration component 9 is installed on the three-dimensional coordinate frame 10, which means that the position of the aeration component 9 can be adjusted in three directions perpendicular to each other. In practical applications, a plurality of universal casters 11 and a plurality of lifting devices 12 (such as electronic lifters, jacks, etc.) can be provided at the bottom of the three-dimensional coordinate frame 10. The configuration of the universal rollers allows flexible movement and can adapt to a variety of usage scenarios. After reaching the designated use position, the entire three-dimensional coordinate frame 10 and the aeration component 9 can be supported by each lifting device 12 to ensure that they are in a flat and stable working state, thereby reducing interference from the external environment.

[0030] Example 2 The difference between this embodiment and embodiment 1 is that the pressure driving component in this embodiment indirectly controls the opening and closing of the main valve. Specifically, the pressure driving component in this embodiment is a pressure sensor, and the main valve is a solenoid valve. In this way, the solenoid valve opens to different degrees according to different pressure ranges detected by the pressure sensor, and automatic aeration can also be achieved.

[0031] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A self-starting anti-backflow hydraulic mechanical aeration cavitation reduction device, comprising an air supply component, characterized in that: It also includes an aeration assembly, which includes an aeration box and a main valve and a pressure drive component arranged inside the aeration box. The aeration box is provided with an air flow inlet and an equipment connecting pipe, the air flow inlet is connected to the air supply assembly, and the equipment connecting pipe is connected to the hydraulic mechanical equipment; The equipment connecting pipe includes an equipment air inlet pipe and a return pipe. The equipment air inlet pipe is connected with the air flow inlet to form an aeration channel. The equipment air inlet pipe is provided with a check valve. A self-starting channel is provided inside the aeration box, one end of which is closed and the other end is connected with the return pipe. The main valve is used to control the on-off of the aeration channel, and the pressure drive component is used to directly or indirectly control the opening and closing of the main valve according to the pressure in the self-starting channel.

2. The self-starting anti-backflow hydraulic mechanical aeration and cavitation reduction device according to claim 1 is characterized in that: The pressure-driven component includes a moving piston, a piston rod and a first elastic member. The piston rod is slidably arranged and one end is fixedly connected to the moving piston. When the pressure in the self-starting channel increases, the moving piston is squeezed and moved. The first elastic member is used to reset the moving piston after the pressure in the self-starting channel is restored. The main valve comprises a main valve core, a main valve stem and a second elastic member. The main valve core closes the aeration channel under the action of the second elastic member. The main valve stem is slidably arranged and one end is fixedly connected to the main valve core. The other end of the main valve stem is connected to the other end of the piston rod through a transmission component, so that when the moving piston is pressed and moved, the main valve core is driven to move and squeeze the second elastic member to open the aeration channel, and when the moving piston is reset, the main valve core is driven to move in the opposite direction to re-close the aeration channel.

3. The self-starting anti-backflow hydraulic mechanical aeration and cavitation reduction device according to claim 2 is characterized in that: The top end of the piston rod is fixedly connected to the movable piston, and the movable piston moves downward when pressurized; the second elastic member is arranged at the upper end of the main valve core, and the upper end of the main valve stem is fixedly connected to the main valve core; the lower end of the main valve stem is connected to the lower end of the piston rod through the transmission component.

4. The self-starting anti-backflow hydraulic mechanical aeration and cavitation reduction device according to claim 3 is characterized in that: The transmission component includes a lever and a support seat. The support seat is fixedly arranged. The middle part of the lever is rotatably connected to the support seat. Both ends of the lever are provided with waist-shaped grooves. Pins are slidably arranged in the waist-shaped grooves. The pin at one end of the lever is hinged to the piston rod, and the pin at the other end of the lever is hinged to the main valve stem.

5. The self-starting anti-backflow hydraulic mechanical aeration and cavitation reduction device according to claim 3 is characterized in that: A piston cavity cooperating with the movable piston is arranged inside the self-starting channel, a plurality of elastic balls are arranged on the side wall of the movable piston along the circumferential direction, and a plurality of groups of grooves cooperating with the elastic balls are arranged on the side wall of the piston cavity along the axial direction.

6. The self-starting anti-backflow hydraulic mechanical aeration and cavitation reduction device according to claim 1 is characterized in that: The pressure driving component is a pressure sensor, and the main valve is a solenoid valve.

7. The self-starting anti-backflow hydraulic mechanical aeration and cavitation reduction device according to any one of claims 1 to 6, characterized in that: The aeration channel is provided with an auxiliary valve after the main valve, and the auxiliary valve comprises an auxiliary valve core and a third elastic member arranged in sequence along the gas flow direction in the aeration channel. The auxiliary valve core closes the aeration channel under the action of the third elastic member.

8. The self-starting anti-backflow hydraulic mechanical aeration and cavitation reduction device according to claim 7 is characterized in that: The air injection passage between the auxiliary valve and the check valve is concave.

9. The self-starting anti-backflow hydraulic mechanical aeration and cavitation reduction device according to any one of claims 1 to 6, characterized in that: The air supply assembly includes an air mixing pipeline and an air compressor, a pressure stabilizing tank, a pneumatic ball valve and an electromagnetic flowmeter which are arranged on the air mixing pipeline in sequence. The air outlet end of the air mixing pipeline is connected to the air flow inlet; the pressure stabilizing tank is provided with a pressure gauge and an exhaust valve.

10. The self-starting anti-backflow hydraulic mechanical aeration and cavitation reduction device according to any one of claims 1 to 6, characterized in that: The aeration assembly is installed on a three-dimensional coordinate frame to achieve position adjustment in three directions perpendicular to each other.

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