A device for preventing backflow aeration and reducing cavitation

Abstract

The present invention belongs to the technical field of hydraulic machinery, and relates to an anti-backflow aeration cavitation reduction device, including a gas channel, one end of the gas channel is connected to a gas source, and the other end of the gas channel is provided with an anti-backflow component; the anti-backflow component includes n baffles and n springs, and the n baffles are all hinged to the inner wall surface of the gas channel; the n baffles are surrounded to form a shielding portion for shielding the outlet of the gas channel; one end of a spring is fixedly connected to a side of a baffle away from the gas source, and the other end is fixedly connected to the inner wall surface of the gas channel. The present invention realizes that under sufficient gas pressure, the n baffles are separated, the shielding portion is opened, and the gas passes smoothly for aeration; when the gas pressure is insufficient, the n baffles are surrounded, and the shielding portion is automatically closed to prevent liquid backflow in the hydraulic machinery.

Description

Technical Field

[0001] The invention belongs to the technical field of hydraulic machinery, and in particular relates to a device for preventing backflow aeration and cavitation reduction. Background Art

[0002] Cavitation is the "cancer" of hydraulic machinery, and existing technologies cannot fundamentally solve the problem of cavitation. Aeration technology inhibits the initial cavitation phenomenon at the mechanism level, has a good cavitation reduction effect, and reduces cavitation to a certain extent; currently, research on aeration cavitation reduction is still in its early stages, and most of the research in the field of aeration cavitation reduction is focused on hydraulic structures, while research and application of aeration cavitation reduction technology for hydraulic machinery are relatively rare.

[0003] The application of aeration cavitation reduction technology in hydraulic machinery has the following problems: (1) During the aeration process, the hydraulic machinery aeration device often suffers from insufficient air pressure, causing the liquid in the hydraulic machinery to flow back into the aeration device; (2) The temperature is low and the air pressure is insufficient in high-altitude areas. The low temperature and low air pressure of the aerated gas will lead to poor aeration cavitation reduction effect of the hydraulic machinery aeration device; (3) The aeration speed cannot be switched according to the actual application scenario, so that the purpose of directional aeration cannot be achieved.

[0004] In particular, the problem of liquid backflow into the aeration device can easily lead to damage to the aeration device, greatly limiting the use of the aeration device. Therefore, it is necessary to develop an anti-backflow aeration cavitation reduction device to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to provide a device for preventing backflow aeration and reducing cavitation so as to solve the technical problem existing in the prior art that liquid in a hydraulic machinery backflows into the aeration device.

[0006] To this end, the present invention provides the following technical solutions:

[0007] A backflow prevention aeration cavitation reduction device comprises a gas channel, one end of the gas channel is connected to a gas source, and the other end of the gas channel is provided with a backflow prevention component; the backflow prevention component comprises n baffles and n springs, 3≤n≤8; the n baffles are all hinged to the inner wall surface of the gas channel; the n baffles are surrounded to form a shielding portion; the shielding portion is used to shield the outlet of the gas channel; one end of a spring is fixedly connected to a side of a baffle away from the gas source, and the other end is fixedly connected to the inner wall surface of the gas channel.

[0008] Furthermore, the shielding portion is in a cone shape formed by n baffles, and the top of the cone of the shielding portion faces a side away from the gas source.

[0009] Furthermore, it also includes a heating component arranged between the gas channel and the gas source, the heating component includes a heat exchange tube group and an air intake tube group, one end of the air intake tube group is connected to the gas source, and the other end is connected to the gas channel, the heat exchange tube group is arranged on the periphery of the air intake tube group, and the water inlet of the heat exchange tube group is connected to the high-temperature water supply device.

[0010] Furthermore, the air intake pipe group includes a plurality of air intake branch pipes arranged in parallel, the heat exchange pipe group includes a plurality of heat exchange tube racks, and a heat exchange tube rack is constructed by constructing a plurality of heat exchange tube bodies; the plurality of heat exchange tube bodies are arranged in parallel, and the end connecting lines of the plurality of heat exchange tube bodies are regular polygons, so that the heat exchange tube rack presents a regular polygonal frame; an air intake branch pipe is arranged in a heat exchange tube rack and is arranged in parallel with the heat exchange tube rack.

[0011] Furthermore, the cross section of the heat exchange tube rack is a regular hexagon, and the sides of a plurality of heat exchange tube racks are sequentially fitted together to form a heat exchange tube group with a honeycomb cross section.

[0012] Further, the air source includes an air compressor.

[0013] Furthermore, the gas source also includes a pressure-stabilizing gas storage bin, a circumferential surface of which is provided with an air inlet, the air inlet is connected to the air compressor, and the pressure-stabilizing gas storage bin is axially connected to the air inlet pipe group of the heating component.

[0014] Furthermore, it also includes a pressure regulating component, which includes a pressure regulating chamber, a piston part and a turntable; the pressure regulating chamber is axially connected to the end of the pressure-stabilizing gas storage chamber away from the heating component, the inner surface of the pressure regulating chamber is provided with an internal thread, the piston part is provided with an external thread threadedly connected to the internal thread, and the end of the piston part away from the pressure regulating chamber is fixedly connected to the turntable.

[0015] Furthermore, an internal thread section that cooperates with the external thread of the piston member is provided on one side of the pressure-stabilizing gas storage tank close to the pressure regulating tank.

[0016] Furthermore, it also includes a circulating water return pipe, on which a water pump is provided, and the heat exchange tube group is connected to the high-temperature water supply device through the circulating water return pipe.

[0017] Furthermore, the air intake branch pipes are in the shape of circular tubes and are distributed at equal distances. The number of the air intake branch pipes is preferably 20 to 30.

[0018] The present invention has at least the following advantages and beneficial effects:

[0019] (1) By forming a shielding part by enclosing n baffles, the n baffles are separated when the gas pressure is sufficient, the shielding part opens, and the gas passes smoothly for aeration; when the gas pressure is insufficient, the n baffles are enclosed, and the shielding part automatically closes to prevent the backflow of liquid in the hydraulic machinery;

[0020] (2) The heat exchange tube group arranged in a honeycomb shape as a whole is used to exchange heat with the air intake tube group. Compared with the conventional heat exchange method, it has a better heat exchange effect. The heat exchange tube group arranged in a honeycomb shape fits the air intake tube group, which is conducive to heat exchange and saves space.

[0021] (3) The turntable is used to compress the air in the pressure regulating chamber so that the aeration can reach the working state more quickly and stably. The flow rate of the aeration gas can be adjusted and the possibility of backflow can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below.

[0023] Figure 1 Schematic diagram of the structure of the device for preventing backflow aeration and cavitation reduction according to Example 1 of the present invention;

[0024] Figure 2 This is a schematic diagram of the structure of the heating assembly in Example 1 of the present invention;

[0025] Figure 3 This is a schematic diagram of the structure of the gas channel and the heating assembly in Example 1 of the present invention;

[0026] Figure 4 This is a schematic diagram of the structure of the pressure-stabilizing gas storage bin in Example 1 of the present invention;

[0027] Figure 5 This is a schematic diagram of the structure of the voltage regulating assembly in Example 1 of the present invention.

[0028] Icons: 10-gas channel, 11-shielding part, 12-baffle, 13-spring, 20-heating assembly, 21-heat exchange tube group, 22-heat exchange tube body, 23-inlet pipe group, 24-inlet branch pipe, 25-circulation return pipe, 30-pressure-stabilizing gas storage bin, 31-air inlet, 32-internal thread section, 40-pressure regulating assembly, 41-pressure regulating bin, 42-turntable. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0030] Example 1

[0031] See also Figure 1-Figure 5The present embodiment provides an anti-backflow aeration cavitation reduction device, comprising an air source, a gas channel 10 and an anti-backflow component; the present embodiment uses an air compressor and a pressure-stabilizing air storage bin 30 as air sources for air supply, and the pressure-stabilizing air storage bin 30 is provided with two air inlets 31, and the two air inlets 31 are respectively provided on the circumferential surface of the pressure-stabilizing air storage bin 30, and the two air inlets 31 are symmetrically arranged along the central axis of the pressure-stabilizing air storage bin 30, and the two air inlets 31 are both connected to the air compressor to introduce the compressed air generated by the air compressor into the pressure-stabilizing air storage bin 30. In the present embodiment, the pressure-stabilizing air storage bin 30 can play the role of pressure-stabilizing air storage, and a pressure gauge is provided in the pressure-stabilizing air storage bin 30, so that the air pressure in the pressure-stabilizing air storage bin 30 can be known.

[0032] The anti-backflow component includes n baffles 12 and n springs 13. In this embodiment, n=3 is further preferred, that is, the anti-backflow component includes three baffles 12 and three springs 13. The pressure-stabilizing gas storage tank 30 is axially connected to the gas channel 10. The three baffles 12 are hinged to the inner wall of the gas channel 10. The three baffles 12 are combined to form a shielding portion 11 for shielding the outlet of the gas channel 10. One end of a spring 13 is fixedly connected to a side of a baffle 12 away from the gas source, and the other end is fixedly connected to the inner wall of the gas channel 10.

[0033] In this embodiment, the three baffles 12 are exactly the same. The shielding portion 11 formed by the three exactly the same baffles 12 can be regarded as a three-part opening. When gas with sufficient pressure is introduced, the three-part opening opens and the gas flows out from here; when there is no ventilation or insufficient gas pressure, the three-part opening closes to prevent liquid from flowing back into the gas channel 10.

[0034] In this embodiment, the shielding portion 11 formed by the three baffles 12 is conical, and the top of the conical shielding portion 11 faces the side away from the air source. Such a design makes it difficult for the external liquid to break through the conical structure formed by the three baffles 12 even if there is a certain pressure when there is no ventilation or insufficient air pressure (that is, when the three-part opening is closed), thereby better preventing the backflow of liquid.

[0035] Specifically, the spring 13 is in a compressed state when the gas delivery pressure is large enough. At this time, the three-part opening is expanded to open the gas channel 10, and the high-pressure gas is delivered to the hydraulic machinery through the opened three-part opening; when the pressure of the mixed gas is insufficient, the spring 13 is restored from a compressed state to a relaxed state, thereby closing the three-part opening. At this time, due to insufficient gas mixing pressure, liquid backflow in the hydraulic machinery is prone to occur, but the liquid pressure in the hydraulic machinery generally cannot cause the spring 13 to deform, and the three-part opening is always in a closed state, completely isolating the backflowing liquid from the gas storage area of ​​the pressure-stabilizing gas storage tank 30, so that the backflowing liquid cannot enter the gas storage area of ​​the pressure-stabilizing gas storage tank 30, which can prevent the occurrence of backflow to the greatest extent.

[0036] In order to solve the problem of liquid backflow caused by insufficient air pressure due to low temperature in high altitude areas, the present embodiment further provides a heating component 20 between the anti-backflow component and the gas source for heating the gas and then delivering it to the anti-backflow component.

[0037] The heating assembly 20 of this embodiment includes an air intake pipe group 23, a heat exchange pipe group 21 and a circulating return pipe 25. One end of the air intake pipe group 23 is connected to the pressure-stabilizing gas storage tank 30, and the other end is connected to the gas channel 10. The heat exchange pipe group 21 is arranged on the outer periphery of the air intake pipe group 23, and a water pump is provided on the circulating return pipe 25. The heat exchange pipe group 21 is connected to the high-temperature water supply device through the circulating return pipe 25.

[0038] Specifically, see Figure 2 In this embodiment, the air intake pipe group 23 is further designed as 28 air intake branches 24 arranged in parallel. The air intake branches 24 are in the shape of regular circular tubes and are distributed at equal distances. The circular tubular air intake branches 24 can ensure the stability of the flow state of the compressed gas. The heat exchange tube group 21 includes multiple heat exchange tube racks. A heat exchange tube rack is constructed by multiple heat exchange tube bodies 22 to form a regular polygonal frame with a regular polygonal cross section; an air intake branch 24 is arranged in a heat exchange tube rack and is arranged parallel to the heat exchange tube rack; the cross section of the heat exchange tube rack is a regular hexagon, and the sides of multiple heat exchange tube racks are sequentially fitted to form a heat exchange tube group 21 frame with a honeycomb cross section. High-temperature water flows in the pipes of the heat exchange tube body 22, exchanges heat with the gas in the air intake branch 24, and plays a role in heating the gas;

[0039] A small water pump is provided in the area of ​​the circulating return water pipe 25, and high-temperature water flows from the circulating return water pipe 25 into the heat exchange tube group 21, and the circulating return water pipe 25 plays the role of water circulation; the honeycomb heat exchange tube group 21 can be heated in close contact with the air intake pipe group 23, and has a better heat exchange effect, and continuous heat exchange is carried out from the air inlet to the air outlet of the air intake pipe group 23, so as to achieve a better heat exchange effect.

[0040] In order to avoid the occurrence of insufficient pressure of the air compressor in high altitude areas, a pressure regulating component 40 is further provided at the rear side of the pressure stabilizing gas storage bin 30 in this embodiment, see Figure 5 The pressure regulating assembly 40 includes a pressure regulating chamber 41, a piston member (not shown in the figure) and a turntable 42; the pressure regulating chamber 41 is axially connected to the end of the pressure-stabilizing gas storage chamber 30 away from the heating assembly 20, the inner surface of the pressure regulating chamber 41 is provided with an internal thread, the piston member is provided with an external thread threadedly connected to the internal thread, and the side of the pressure-stabilizing gas storage chamber 30 close to the pressure regulating chamber 41 is also provided with an internal thread section 32 used in conjunction with the external thread of the piston member, and the piston member is fixedly connected to the turntable at the end away from the pressure regulating chamber 41.

[0041] Rotating the turntable 42 will drive the piston to move axially. As the piston moves, the gas in the pressure regulating chamber 41 and the pressure-stabilizing gas storage chamber 30 is further compressed, improving the gas pressure corresponding to the aeration, thereby improving the aeration effect. Specifically, the gas pressure determines the expansion angle of the three-part opening, and the expansion angle of the three-part opening determines the flow area of ​​the compressed gas through the anti-backflow component. When the flow rate remains unchanged, according to the formula, (Q is the flow rate, V is the flow rate, and A is the flow area), if the flow area of ​​the gas changes, the flow rate of the gas will also change, thereby achieving the purpose of controlling the flow rate of the aerated gas.

[0042] Specifically, under the aeration condition, the air compressor provides high-pressure gas. After the high-pressure gas fills the gas storage area, the high-pressure gas will flow along the intake pipe group 23 toward the gas channel 10. At this time, under the pressure of the high-pressure gas, the three-part opening will be pushed toward the end away from the pressure-stabilizing gas storage bin 30, so that the spring 13 is in a compressed state. The three-part opening is expanded at a certain angle along the center point. Under the action of the stable high-pressure gas, the expansion angle of the three-part opening tends to be stable, the flow area of ​​the high-pressure gas tends to be fixed, and the flow rate of the aerated gas also tends to be stable. When it is necessary to adjust the flow rate of the aerated gas, the gas in the pressure-stabilizing gas storage bin 30 is further compressed by rotating the turntable 42, so that the gas in the pressure-stabilizing gas storage bin 30 is forced to be pressurized. When the pressure of the gas increases, the expansion angle of the three-part opening is increased, and a larger flow area is obtained. When the gas flow rate remains unchanged, the flow rate of the aerated gas also decreases with the increase of the flow area, thereby achieving the purpose of adjusting the gas flow rate.

[0043] In summary, the anti-backflow aeration cavitation reduction device of this embodiment prevents liquid from backflowing into the aeration device by setting an anti-backflow component; by setting a heating component 20 to change the temperature of the mixed gas and adjust the pressure of the mixed gas to improve the aeration cavitation reduction effect; by setting a pressure regulating component 40 to change the pressure of the mixed gas and thus adjust the flow rate of the aerated gas. The anti-backflow aeration cavitation reduction device of this embodiment is divided into two working states, the fully closed state of the shielding part 11 and the unfolded state of the shielding part 11. The closed state of the shielding part 11 (also called the three-divided opening in this embodiment) is the anti-backflow working condition. The shielding part 11 will separate the liquid in the hydraulic machinery from the air inlet pipe group 23, which can prevent the occurrence of backflow to the greatest extent; the unfolded state of the shielding part 11 (also called the three-divided opening in this embodiment) is the aeration working condition, and the opening of the shielding part 11 can be adjusted according to different gas pressures to achieve the purpose of adjusting the gas flow rate.

[0044] 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 device for preventing backflow aeration and cavitation reduction, characterized in that: It comprises a gas channel, one end of which is connected to a gas source, and the other end of which is provided with an anti-backflow component; The anti-backflow assembly comprises n baffles and n springs, 3≤n≤8; the n baffles are hinged to the inner wall surface of the gas channel; the n baffles are combined to form a shielding portion; the shielding portion is used to shield the outlet of the gas channel; One end of the spring is fixedly connected to a side of the baffle away from the gas source, and the other end is fixedly connected to the inner wall surface of the gas channel; The gas source includes an air compressor; the gas source also includes a pressure-stabilizing gas storage bin, the circumferential surface of the pressure-stabilizing gas storage bin is provided with an air inlet, the air inlet is connected to the air compressor, and the pressure-stabilizing gas storage bin is axially connected to the air inlet pipe group of the heating component; It also includes a pressure regulating component, which includes a pressure regulating chamber, a piston member and a turntable; the pressure regulating chamber is axially connected to the end of the pressure-stabilizing gas storage chamber away from the heating component, the inner surface of the pressure regulating chamber is provided with an internal thread, the piston member is provided with an external thread threadedly connected to the internal thread, and the end of the piston member away from the pressure regulating chamber is fixedly connected to the turntable.

2. The device for preventing backflow aeration and reducing cavitation according to claim 1, characterized in that: The shielding portion is in a cone shape formed by n baffles, and the top of the cone of the shielding portion faces the side away from the gas source.

3. The device for preventing backflow aeration and reducing cavitation according to claim 2, characterized in that: It also includes a heating component arranged between the gas channel and the gas source, the heating component includes a heat exchange tube group and an air intake tube group, one end of the air intake tube group is connected to the gas source, and the other end is connected to the gas channel, the heat exchange tube group is arranged on the periphery of the air intake tube group, and the water inlet of the heat exchange tube group is connected to the high-temperature water supply device.

4. The device for preventing backflow aeration and reducing cavitation according to claim 3, characterized in that: The air intake pipe group includes a plurality of air intake branches arranged in parallel, and the heat exchange pipe group includes a plurality of heat exchange pipe racks, wherein the heat exchange pipe rack is constructed by a plurality of heat exchange pipe bodies; the plurality of heat exchange pipe bodies are arranged in parallel, and the end connecting line of the plurality of heat exchange pipe bodies is a regular polygon, so that the heat exchange pipe rack presents a regular polygon frame; An air intake branch pipe is arranged in a heat exchange tube rack and is arranged in parallel with the heat exchange tube rack.

5. The device for preventing backflow aeration and reducing cavitation according to claim 4, characterized in that: The cross section of the heat exchange tube rack is a regular hexagon, and the sides of a plurality of the heat exchange tube racks are sequentially attached to form the heat exchange tube group with a honeycomb cross section.

6. The device for preventing backflow aeration and reducing cavitation according to claim 1, characterized in that: An internal thread section used in conjunction with the external thread of the piston member is provided on one side of the pressure-stabilizing gas storage bin close to the pressure regulating bin.

7. The device for preventing backflow aeration and reducing cavitation according to any one of claims 3 to 4, characterized in that: It also includes a circulating water return pipe, on which a water pump is provided, and the heat exchange tube group is connected with the high-temperature water supply device through the circulating water return pipe.

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