Noiseless underwater suction and blowing combined control device and method

Abstract

The application discloses a noiseless underwater suction-blowing combination control device, which sequentially communicates suction ports, inflow pipes, inflow end shock absorbers, water pumps, pressure gauges and electromagnetic flowmeters from the direction of an inflow end to an outflow end; the outflow ports of the electromagnetic flowmeters are respectively communicated with exhaust switches and the outflow end shock absorbers; the outflow end shock absorbers are communicated with jet ports through outflow pipes; the suction ports are installed at the inlets of the inflow pipes; the outlets of the inflow pipes are connected with the inlets of the water pumps through the inflow end shock absorbers; the outlets of the water pumps are connected with the inlets of the outflow pipes through the outflow end shock absorbers; and the outlets of the outflow pipes are provided with the jet ports. The application further discloses a noiseless underwater suction-blowing combination control method, which can control the suction speed and the jet speed to reach a uniform and stable state. The application can solve the problems of large pulsating power and extra noise when the underwater jet is powered by the water pump, and can improve the acoustic stealth performance of underwater vehicles such as submarines and torpedoes.

Description

Technical Field

[0001] This invention relates to an underwater suction and blowing control device and method, specifically to a noiseless underwater suction and blowing combined control device and method, belonging to the field of acoustic measurement. Background Technology

[0002] In recent years, passive control technologies such as eddy current generators, trenches, and traps have been applied to reduce hydrodynamic noise in underwater vehicles such as submarines and torpedoes. These technologies are simple in construction and do not require an energy supply. However, passive control technologies have poor controllability and cannot adapt to the complex and ever-changing marine environment. When the speed and angle of attack of the underwater vehicle change, the control effect of passive control technologies is greatly reduced. Active control technologies can adjust parameters as needed, resulting in better control over the flow field and hydrodynamic noise.

[0003] As active control technologies, suction and jetting can remove low-momentum fluids from the boundary layer and inject high-momentum fluids, reducing the pulsating pressure of the turbulent boundary layer. However, currently published literature often only applies suction (Zhang Shengli, Large Eddy Simulation Study on Horseshoe Vortex Control at Airfoil Joint, 12th National Conference on Hydrodynamics, 2013) or jetting for control, rarely considering the subsequent processing of the extracted fluid or the source of the ejected fluid. This limits suction and jetting technologies to theoretical and simulation studies, neglecting the effects of pressure differences, temperature, and bubbles in reality, resulting in significant problems in engineering implementation. Furthermore, suction and jetting require an external power source, and the driving device generates pulsating forces during operation. These pulsating forces acting on rigid walls produce additional vibration and noise.

[0004] Zero-mass jet technology combines suction and jet control techniques and does not require an additional air or water source, achieving good results in flow field control. However, zero-mass jets require a device to generate vibration during use, thus the resulting single-frequency noise limits its application in noise reduction. It is evident that current suction and jet technologies cannot simultaneously achieve suction and jet flow without avoiding additional pulsating forces and noise interference, failing to meet the needs of acoustic engineering applications. Summary of the Invention

[0005] This invention addresses the problem of significant pulsation and additional noise generated when underwater jets are powered by water pumps. An underwater suction-blowing combined control device employs both suction and jet control to generate a zero-mass jet, improving the acoustic stealth performance of submarines, torpedoes, and other underwater vehicles. Furthermore, a noiseless underwater suction-blowing combined control device and method are proposed.

[0006] The technical solution adopted by the present invention to solve the above problems is as follows: A noiseless underwater suction and blowing combined control device includes a suction port, an inlet pipe, an inlet end vibration isolator, a water pump, a pressure gauge, an electromagnetic flowmeter, an exhaust switch, an outlet end vibration isolator, an outlet pipe, and a jet port. From the inlet end to the outlet end, the suction port, inlet pipe, inlet end vibration isolator, water pump, pressure gauge, and electromagnetic flowmeter are connected in sequence. The outlet of the electromagnetic flowmeter is connected to the exhaust switch and the outlet end vibration isolator respectively. The outlet end vibration isolator is connected to the jet port through the outlet pipe. The suction port is installed at the inlet of the inlet pipe. The outlet of the inlet pipe is connected to the inlet of the water pump through the inlet end vibration isolator. The outlet of the water pump is connected to the inlet of the outlet pipe through the outlet end vibration isolator. The outlet of the outlet pipe is equipped with a jet port.

[0007] Furthermore, a flow-blocking device is provided in both the suction port and the jet port. The flow-blocking device is plate-shaped, and the plate surface of the flow-blocking device is perpendicular to the axis of the suction port and the jet port.

[0008] Furthermore, the flow interception device inside the suction port includes a double-layer porous filter screen and zeolite. The double-layer porous filter screen is welded to the suction port, and multiple zeolite stones are disposed between the double-layer porous filter screen to adsorb impurities in the water.

[0009] Furthermore, the flow interception device inside the jet port includes a double-layer grid and solid silicone balls. The double-layer grid is welded to the jet port, and multiple solid silicone balls are disposed between the double-layer grid to absorb and attenuate the pulsating force in the flow.

[0010] Furthermore, the suction port and porous filter screen are made of stainless steel.

[0011] Furthermore, the jet nozzle and grille are made of stainless steel.

[0012] Furthermore, the inlet and outlet pipes are made of polyvinyl chloride steel wire hoses.

[0013] Furthermore, the water pump is a constant pressure variable frequency pump.

[0014] A noiseless underwater suction and blowing combined control method includes the following steps: Install the suction port and jet port at the position to be controlled, and inject water into the pipe; Open the exhaust valve at the small opening to completely expel the gas in the pipe, then close the exhaust valve. Based on the data displayed on the pressure gauge, the pressure value inside the pipe when the water pump is not turned on is obtained; Set the target pressure for the water pump. When the target pressure is greater than the pressure inside the pipe when the water pump is not turned on, the water pump will start working. Adjust the target pressure of the water pump, obtain the accurate mass flow rate by the electromagnetic flow meter in the device, and calculate the corresponding suction velocity and jet velocity by the pipe diameter of the suction port and jet port.

[0015] Furthermore, after adjusting the target pressure, the water pump undergoes a pressurization process. During this process, the pressure in the pipe will gradually stabilize. When the readings of the pressure gauge and the electromagnetic flowmeter reach a stable state, it indicates that the suction velocity and jet velocity of the underwater suction and blowing combined control device have reached a uniform and stable state.

[0016] The beneficial effects of this invention are: 1. The mainstream fluid is drawn in through the suction port, then through the inlet pipe and inlet end vibration isolator to the water pump, achieving underwater suction. The fluid is pressurized by the water pump, passes through a pressure gauge, electromagnetic flowmeter, outlet end vibration isolator, and outlet pipe, and is ejected from the jet port, achieving underwater jet. In the underwater suction and jet combined control device, the suction and jet are in the same environment, generating a zero-mass jet. The properties of the ejected fluid depend on the properties of the fluid drawn in from the mainstream, with no pressure or temperature differences. At the same time, the underwater suction and jet combined control utilizes both suction and jet to control the flow field, resulting in better control effect and higher energy utilization efficiency compared to simple suction or jet methods.

[0017] 2. The double-layer porous stainless steel filter screen installed in the suction port makes the suction of this underwater suction and blowing combined control device more uniform, while the double-layer fine stainless steel grid at the jet port reduces jet pulsation and achieves uniform jet. Zeolite is placed between the double-layer porous stainless steel filter screen. Zeolite can adsorb impurities in the water and ensure stable operation of the device. Some solid silicone balls are placed between the double-layer fine stainless steel grid. The silicone balls have a large deformation and damping coefficient, which can effectively absorb the interference of water flow pulsation in the attenuation tube and reduce the vibration effect.

[0018] 3. By using a small-opening branch to discharge the existing gas through an exhaust switch, the pulsation and noise interference of water bubbles during device operation are avoided.

[0019] 4. All connecting pipes in this noiseless underwater suction and blowing combined control device are made of steel wire hose. The characteristic impedance of the steel wire hose is close to that of water, while the characteristic impedance of water is much greater than that of air. Therefore, the boundary between the steel wire hose and the air can be regarded as an absolutely soft boundary. Under the soft boundary effect, there are no sound waves propagating in the pipe, and the underwater suction and blowing combined control device does not have any additional noise interference. Attached Figure Description

[0020] Figure 1 This is a structural schematic diagram of one embodiment of the present invention.

[0021] Figure 2 This is a schematic diagram of the structure of a porous filter.

[0022] Figure 3 This is a schematic diagram of the axial cross-section of the suction port.

[0023] Figure 4 This is a schematic diagram of the grille structure.

[0024] Figure 5 This is a schematic diagram of the axial cross-section of the jet nozzle.

[0025] Figure 6 This is a flowchart of a noiseless underwater suction and blowing combined control method according to the present invention. In the diagram: 1. Inlet; 2. Inlet pipe; 3. Inlet end vibration damper; 4. Water pump; 5. Pressure gauge; 6. Electromagnetic flow meter; 7. Exhaust switch; 8. Outlet end vibration damper; 9. Outlet pipe; 10. Jet port; 11. Porous filter screen; 12. Zeolite; 13. Grille; 14. Solid silicone ball. Detailed Implementation

[0026] Specific implementation method one: Combining Figure 1-5 This implementation method is described as follows: Figure 1-5 As shown, the noiseless underwater suction and blowing combined control device of this embodiment includes a suction port 1, an inlet pipe 2, an inlet end vibration isolator 3, a water pump 4, a pressure gauge 5, an electromagnetic flowmeter 6, an exhaust switch 7, an outlet end vibration isolator 8, an outlet pipe 9, and a jet port 10. The suction port 1 is connected to the inlet end vibration isolator 3 through the inlet pipe 2. The other end of the vibration isolator is connected to the inlet of the water pump 4. The outlet of the water pump 4 is connected to the pressure gauge 5. The other end of the pressure gauge 5 is connected to the inlet of the electromagnetic flowmeter 6. The outlet of the electromagnetic flowmeter 6 is connected to the exhaust switch 7 and the outlet end vibration isolator 8. The outlet end vibration isolator 8 is connected to the jet port 10 through the outlet pipe 9. The suction port 1 is installed at the inlet of the inlet pipe 2. The outlet of the inlet pipe 2 is connected to the inlet of the water pump 4 through the inlet end vibration isolator 3. The outlet of the water pump 4 is connected to the inlet of the outlet pipe 9 through the outlet end vibration isolator 8. The outlet of the outlet pipe 9 is equipped with a jet port 10. The mainstream fluid is drawn in through the suction port 1, through the inlet pipe 2 and the inlet end vibration isolator 3, and then into the water pump 4, realizing underwater suction. The fluid is pressurized by the water pump 4, passes through the pressure gauge 5, the electromagnetic flowmeter 6, the outlet end vibration isolator 8, and the outlet pipe 9, and is ejected from the jet port 10, realizing underwater jet. In the underwater suction and blowing combined control device, the suction and jet are in the same environment, generating a zero-mass jet. The fluid properties ejected by the jet depend on the fluid properties drawn in from the mainstream, and there is no difference in pressure or temperature. At the same time, the underwater suction and blowing combined control utilizes both suction and jet to control the flow field. Compared with simple suction and jet methods, the control effect is better and the energy utilization efficiency is higher.

[0027] Both the suction port 1 and the jet port 10 are equipped with flow-blocking devices, which are plate-shaped and whose surfaces are perpendicular to the axes of the suction port 1 and the jet port 10. The flow-blocking device in the suction port 1 includes a double-layer porous filter screen 11 and zeolite 12. The double-layer porous filter screen 11 is welded to the suction port 1, and multiple zeolite stones 12 are placed between the double-layer porous filter screen 11 to adsorb impurities in the water. Preferably, the suction port 1 and the porous filter screen 11 are made of stainless steel. The diameter of the porous filter screen 11 is 50 mm, and the opening is a round hole with a diameter of 3 mm, making the suction more uniform. Multiple zeolite stones 12 are placed between the double-layer porous filter screen 11. Zeolite 12 is a type of natural aluminosilicate mineral, and its shape is approximately circular with a diameter of about 5 mm, which can act as a porous material to adsorb impurities in the water. One end of the suction port 1 is threaded, and the other end is connected to the inlet pipe 2 through a pagoda-shaped groove. The tip of the pagoda points towards the inlet pipe 2 and is clamped and fixed by a galvanized thickened pipe clamp.

[0028] The inlet pipe 2 is a polyvinyl chloride steel wire hose with an inner diameter of 50mm, an outer diameter of 60mm, and a length of 4m. One end of the inlet pipe 2 is connected to the suction port 1, and the other end is clamped and fixed to the iron pipe connected to the first flange by a galvanized thickened pipe clamp. The iron pipe has an inner diameter of 45mm and an outer diameter of 50mm, and a pagoda-shaped groove is opened at the end, with the tip of the pagoda pointing towards the vibration damper throat 3 at the inlet end.

[0029] The inlet end vibration isolator is model DN50. The two ends of the vibration isolator are fastened to the first flange and the second flange respectively by bolts, and the middle is sealed with a rubber gasket to reduce vibration, reduce noise, and have good flexibility.

[0030] Pump 4 is a constant pressure variable frequency pump. Preferably, pump 4 is a Lingxiao 304 stainless steel variable frequency booster pump, model CMI 8-40(T), with a power of 2.2Kw. As the power source of the underwater suction and blowing combined control device, one end is connected to the external iron pipe of the second flange, and the other end is connected to the pressure gauge 5. Pump 4 outputs constant pressure by changing the frequency, and the flow velocity in the pipe is stable. The flow velocity can be quickly adjusted by adjusting the target pressure.

[0031] Pressure gauge 5 is a high-precision intelligent electronic digital display pressure gauge, model QD-YB80, with a measurement accuracy of 0.2 class. It can accurately reflect the pressure changes in the pipe. Pressure gauge 5 is fastened to the outlet end of water pump 4 by threads.

[0032] The electromagnetic flowmeter 6 is an intelligent direct-display type, model DN50 with PTFE lining. Both ends of the electromagnetic flowmeter 6 are bolted to the third and fourth flanges respectively, with a rubber gasket used for sealing in between. The outlet of the electromagnetic flowmeter 6 has a small vertical opening and a large horizontal opening. The end of the branch of the small vertical opening is threadedly connected to an exhaust switch 7. The exhaust switch 7 is a valve suitable for gas passage (e.g., a ball valve) used to discharge gas present in this noiseless underwater suction-blowing combined control device, avoiding pulsation and noise interference from air bubbles in the water during device operation. The large horizontal opening is fixedly connected to the outlet vibration damper 8, allowing the electromagnetic flowmeter 6 to visually display the mass flow rate of the passing fluid.

[0033] The outflow end vibration isolator is model 8, DN50. The two ends of the vibration isolator are fastened to the fifth flange and the sixth flange respectively by bolts, and the middle is sealed with a rubber gasket to reduce vibration, reduce noise, and has good flexibility.

[0034] The outlet pipe 9 is a polyvinyl chloride steel wire hose with an inner diameter of 50mm, an outer diameter of 60mm, and a length of 4m. One end of the outlet pipe 9 is connected to the jet port 10, and the other end is clamped and fixed to the iron pipe connected to the sixth flange by a galvanized thickened pipe clamp. The iron pipe has an inner diameter of 45mm, an outer diameter of 50mm, and a pagoda-shaped groove at the end, with the tip of the pagoda pointing towards the jet port 10.

[0035] The flow-blocking device within the jet outlet 10 includes a double-layer grid 13 and solid silicone balls 14. The double-layer grid 13 is welded to the jet outlet 10, and multiple solid silicone balls 14 are disposed between the double-layer grid 13 to absorb and attenuate the pulsating force in the flow. Preferably, the jet outlet 10 and the grid 13 are made of stainless steel, the diameter of the grid 13 is 50 mm, and the sieve aperture size between the grid 13 is 3 mm; this reduces jet pulsation and achieves a uniform jet. Multiple solid silicone balls 14 are placed between the double-layer fine stainless steel grid 13; preferably, the silicone balls have a diameter of 5 mm. The gaps between the silicone balls facilitate water flow, and the large deformation and frictional damping of the silicone balls achieve the effect of vibration suppression and pulsating force dissipation.

[0036] The density and speed of sound of the PVC steel wire hose wall are close to those of water, and the outside of the hose is air. The wall of the connecting pipe can be approximated as an absolutely soft boundary. Considering the pump as the sound source, and because the length of the hose is much greater than its diameter, it can be approximated as an infinitely long circular pipe. The cutoff frequency in the hose is: ① In formula ① The first root of the 0th order Bessel equation is given. The equivalent diameters of inlet pipe 2 and outlet pipe 9 are: speed of sound Therefore, the cutoff frequency in the pipe is approximately 11.51 kHz. The maximum speed of pump 4 is 3000 r / min, and it has 4 blades. Therefore, the maximum shaft frequency of pump 4 is 50 Hz, and the maximum blade frequency is 200 Hz. Since the shaft and blade frequencies of pump 4 are much lower than the cutoff frequency of the sound waves in the pipe, there are no propagating sound waves in the pipe. Therefore, the noise from pump 4 will not affect the control effect.

[0037] A noiseless underwater suction and blowing combined control method, the steps of which are as follows: Install the suction port 1 and the jet port 10 in the position to be controlled, and inject water into the pipe; Open the exhaust switch 7 at the small opening to completely expel the gas in the pipe, then close the exhaust switch 7. Based on the data displayed on pressure gauge 5, the pressure value inside the pipe when water pump 4 is not turned on is obtained; Set the target pressure of water pump 4. When the target pressure is greater than the pressure in the pipe when water pump 4 is not turned on, water pump 4 will start to work. Adjust the target pressure of water pump 4, obtain the accurate mass flow rate by electromagnetic flowmeter 6 in the device, and calculate the corresponding suction velocity and jet velocity by using the pipe diameters of suction port 1 and jet port 10.

[0038] After adjusting the target pressure, the water pump 4 undergoes a pressurization process. During this process, the pressure in the pipe will gradually stabilize. When the readings of the pressure gauge 5 and the electromagnetic flowmeter 6 reach a stable state, it indicates that the suction velocity and jet velocity of the underwater suction and blowing combined control device have reached a uniform and stable state.

[0039] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent substitutions, and improvements made to the above embodiments without departing from the scope of the present invention, based on the technical essence of the present invention and within the spirit and principles of the present invention, shall still fall within the protection scope of the present invention.

Claims

1. A noiseless underwater suction and blowing combined control device, characterized in that: The system includes a suction port (1), an inlet pipe (2), an inlet end vibration isolator (3), a water pump (4), a pressure gauge (5), an electromagnetic flowmeter (6), an exhaust switch (7), an outlet end vibration isolator (8), an outlet pipe (9), and a jet port (10). From the inlet end to the outlet end, the system sequentially connects the suction port (1), the inlet pipe (2), the inlet end vibration isolator (3), the water pump (4), the pressure gauge (5), and the electromagnetic flowmeter (6). The outlet of the electromagnetic flowmeter (6) is connected to the exhaust switch (7) and the outlet end vibration isolator (8) respectively. The outlet of the electromagnetic flowmeter (6) has a vertical small opening and a horizontal large opening. The end of the vertical small opening branch is threaded to the exhaust switch (7), and the horizontal large opening branch is threaded to the exhaust switch (7). The opening is fixedly connected to the outlet end vibration damper (8). The outlet end vibration damper (8) is connected to the jet port (10) through the outlet pipe (9). The suction port (1) is installed at the inlet of the inlet pipe (2). The outlet of the inlet pipe (2) is connected to the inlet of the water pump (4) through the inlet end vibration damper (3). The outlet of the water pump (4) is connected to the inlet of the outlet pipe (9) through the outlet end vibration damper (8). The outlet of the outlet pipe (9) is equipped with a jet port (10). The suction port (1) and the jet port (10) are respectively equipped with a flow-blocking device. The flow-blocking device is plate-shaped. The plate surface of the flow-blocking device is perpendicular to the axis of the suction port (1) and the jet port (10). The inlet pipe (2) and the outlet pipe (9) are polyvinyl chloride steel wire hoses.

2. The noiseless underwater suction and blowing combined control device according to claim 1, characterized in that: The intercepting device inside the suction port (1) includes a double-layer porous filter screen (11) and zeolite (12). The double-layer porous filter screen (11) is welded to the suction port (1), and multiple zeolites (12) are arranged between the double-layer porous filter screen (11) to adsorb impurities in the water.

3. The noiseless underwater suction and blowing combined control device according to claim 1, characterized in that: The flow interception device inside the jet port (10) includes a double-layer grid (13) and solid silicone balls (14). The double-layer grid (13) is welded to the jet port (10), and multiple solid silicone balls (14) are disposed between the double-layer grid (13) to absorb and attenuate the pulsating force in the flow.

4. The noiseless underwater suction and blowing combined control device according to claim 2, characterized in that: The suction port (1) and the porous filter screen (11) are made of stainless steel.

5. The noiseless underwater suction and blowing combined control device according to claim 3, characterized in that: The jet nozzle (10) and the grille (13) are made of stainless steel.

6. The noiseless underwater suction and blowing combined control device according to claim 1, characterized in that: The water pump (4) is a constant pressure variable frequency pump.

7. A control method for a noiseless underwater suction and blowing combined control device according to any one of claims 1-6, characterized in that: Includes the following steps: Install the suction port (1) and the jet port (10) in the position to be controlled, and inject water into the pipe; Open the exhaust switch (7) at the small opening, and after completely venting the gas in the pipe, close the exhaust switch (7). Based on the data displayed by the pressure gauge (5), the pressure value inside the pipe when the water pump (4) is not turned on is obtained; Set the target pressure of the water pump (4). When the target pressure is greater than the pressure in the pipe when the water pump (4) is not turned on, the water pump (4) will start working. Adjust the target pressure of the water pump (4), obtain the accurate mass flow rate by the electromagnetic flowmeter (6) in the device, and calculate the corresponding suction velocity and jet velocity by the pipe diameter of the suction port (1) and the jet port (10).

8. The control method of the noiseless underwater suction and blowing combined control device according to claim 7, characterized in that: After adjusting the target pressure, the water pump (4) has a pressurization process. During this process, the pressure in the pipe will gradually stabilize. When the readings of the pressure gauge (5) and the electromagnetic flowmeter (6) reach a stable state, it indicates that the suction velocity and jet velocity of the underwater suction and blowing combined control device have reached a uniform and stable state.

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