Particle sowing device for underwater flow field tracking

Abstract

The invention belongs to the technical field of flow field tracking, and discloses a particle sowing device for underwater flow field tracking, which comprises a mounting frame, a storage barrel and a compressed gas cylinder, a partition plate is arranged in the storage barrel, the storage barrel is divided into a storage cavity and a driving cavity by the partition plate, tracking particles and a push plate are placed in the storage cavity, a piston is arranged on one side of the push plate, and the piston is arranged on the other side of the push plate. The storage cavity is provided with a discharge port and an electric control switch valve, the outer side of the storage barrel is provided with a charging port and a sealing cover, the air outlet end of the compressed air cylinder is provided with a pressure regulating valve, the pressure regulating valve is connected with an air inlet pipe, and the air inlet pipe extends into the storage barrel to be communicated with the space between the push plate and the partition plate; and a gas pressure sensor is arranged on the gas inlet pipe. According to the particle sowing device, tracking particles can be evenly sown according to the required speed, the influence of underwater high pressure is avoided, and tracking and recognition of a flow field can be conveniently conducted in multiple modes such as videos and lasers; the local motion state of the fluid can be directly fed back, and accurate flow state tracking is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of flow field tracking, and in particular relates to a particle spreading device for underwater flow field tracking. Background Art

[0002] Flow field tracking is a very important research method in the field of fluid research. Flow field tracking mainly uses smoke and dye tracking technology. Among them, smoke tracking is used in the field of gas medium tracking, and dye tracking is used in the field of liquid medium tracking. By spreading tracking smoke / dye in the boundary layer, the flow state is analyzed. This method is mainly used for tracking laminar fluids and is only suitable for stable tracking conditions under laboratory conditions.

[0003] The existing flow field tracking technology has the following problems: 1). It mainly focuses on laminar flow tracking, the optical environment for tracking is relatively simple, and the impact of interfering particles is less considered; 2). Existing devices are mainly used under laboratory conditions and have not been applied in practice; 3). There are many suspended particles in the underwater environment, and suspended particles of different shapes and sizes will interfere with the recognition and tracking accuracy of the tracking equipment; 4). Limitations: It is mainly used for laminar flow tracking and cannot be applied to turbulent flow. The tracking medium will disperse under turbulent conditions, resulting in unstable tracking signals.

[0004] In order to meet the needs of video tracking technology, particle tracking can be used to analyze the motion state of each part of the fluid through video analysis technology. However, it is difficult for existing particle spreading devices to adjust the spreading speed of tracking particles, and it is difficult to smoothly release tracking particles under high pressure conditions underwater. Summary of the invention

[0005] In view of this, the object of the present invention is to provide a particle spreading device for underwater flow field tracking. The present invention aims to solve the problem that the existing particle spreading device is difficult to adjust the spreading speed of tracking particles and is difficult to smoothly release tracking particles under high pressure conditions underwater.

[0006] To achieve the above-mentioned purpose, the present invention provides a particle spreading device for underwater flow field tracking, comprising a mounting frame, a material storage barrel and a compressed gas cylinder arranged on the mounting frame, the side of the mounting frame is provided with an external connection interface, a partition is provided in the material storage barrel, the partition divides the material storage barrel into a material storage chamber and a driving chamber, tracking particles and a push plate tightly slidably connected to the inner wall of the material storage chamber are placed in the material storage chamber, a piston is fixedly connected to the side of the push plate facing the tracking particles, a push rod penetrating the partition and extending into the driving chamber is provided on the side of the push plate away from the piston, a discharge port is provided at one end of the material storage chamber away from the driving chamber, an electrically controlled switch valve is installed at the discharge port, a charging port communicating with the material storage chamber is provided on the outer side of the material storage barrel, a sealing cover is provided at the charging port, a pressure regulating valve is installed at the gas outlet end of the compressed gas cylinder, the gas outlet end of the pressure regulating valve is fixedly connected to an air inlet pipe, the air inlet pipe extends into the material storage barrel and communicates with the space between the push plate and the partition, and a gas pressure sensor is provided on the air inlet pipe; The particle spreading device is also equipped with a controller, and the electrically controlled switch valve, the pressure regulating valve, and the gas pressure sensor are all electrically connected to the controller.

[0007] Furthermore, one end of the push rod away from the push plate is fixedly connected to a transverse plate, and a displacement sensor is provided on a side of the transverse plate facing the driving cavity, and the displacement sensor is directly opposite to the transverse plate.

[0008] Furthermore, a sealing rubber ring is provided at the connection between the partition plate and the push rod.

[0009] Furthermore, an insulating cylinder wrapping the push rod, the horizontal plate and the displacement sensor is provided in the driving chamber, one end of the insulating cylinder is fixedly connected to the partition, the end of the insulating cylinder away from the partition is fixedly connected to the storage barrel, an air pump and a gas pressure sensor are provided on the outside of the insulating cylinder, the air inlet end of the air pump is connected to an air suction pipe, a one-way valve is provided in the air suction pipe, the air suction pipe passes through the partition, and communicates with the space between the push plate and the partition.

[0010] Furthermore, a waterproof stepping motor and a bracket are provided in the isolation cylinder, a rotating shaft is provided on the bracket, a take-up wheel is provided on the rotating shaft, a pull rope is wound around the take-up wheel, the free end of the pull rope is fixedly connected to the push rod, and the output end of the waterproof stepping motor is fixedly connected to the rotating shaft.

[0011] Furthermore, the pressure range of the compressed gas cylinder is 0.6 MPa - 10 MPa.

[0012] Furthermore, the compressed gas cylinder and the piston push and spread the tracking particles at a speed of 0.1kg / h - 1.0kg / h.

[0013] Furthermore, the storage capacity of the tracking particles in the storage barrel is 5kg - 10kg.

[0014] Furthermore, a fairing is provided on the mounting frame, and the fairing is used to reduce the influence of the particle spreading device on the original fluid.

[0015] Furthermore, a pressure balancing port is provided at the front end of the storage barrel.

[0016] The beneficial effects of the present invention are: 1. The present invention can evenly spread tracking particles at the required speed and is not affected by underwater high pressure, making it easy to track and identify flow fields in a variety of ways such as video and laser.

[0017] 2. The particle spreading device of the present invention can be installed in the underwater part of the vehicle, and the externally discharged tracking particles are mixed with the fluid, which can directly feedback the local motion state of the fluid and realize accurate process state tracking.

[0018] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic structural diagram of the particle spreading device in Example 1; Figure 2 is a top view of a portion of the particle spreading device in Example 1; Figure 3 This is the control principle diagram of the particle spreading device; Figure 4 It is a top cross-sectional view of the storage barrel in Example 2; The reference numerals in the figure are as follows: compressed gas cylinder 1, storage barrel 2, piston 3, displacement sensor 4, electric control switch valve 5, pressure regulating valve 6, gas pressure sensor 7, mounting frame 8, fairing 9, loading port 10, tracking particles 11, isolation tube 12, vacuum pump 13, waterproof stepping motor 14, take-up wheel 15. DETAILED DESCRIPTION

[0020] In order to make the technical solutions, advantages and purposes of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the protection scope of this application. Example 1.

[0021] like Figure 1 and Figure 2 As shown, the present invention provides a particle spreading device for underwater flow field tracking, including a mounting frame 8, a storage barrel 2 and a compressed gas cylinder 1 arranged on the mounting frame 8, and an external connection interface is arranged on the side of the mounting frame 8, and the external connection interface is used to fix the particle spreading device as a whole to the surface of the object to be measured, so as to ensure the stability of the device in the underwater environment. A partition is arranged in the storage barrel 2, and the partition divides the storage barrel 2 into a storage chamber and a driving chamber. Tracking particles 11 and a push plate that is closed and slidably connected to the inner wall of the storage chamber are placed in the storage chamber. A piston 3 is fixedly connected to the left side of the push plate, and a push rod that penetrates the partition and extends into the driving chamber is arranged on the right side of the push plate. A discharge port is arranged at the left end of the storage chamber, and an electrically controlled switch valve 5 is installed at the discharge port. A charging port 10 that communicates with the storage chamber is arranged on the outside of the storage barrel 2, and a sealing cover is threadedly connected to the charging port 10. A pressure regulating valve 6 is installed at the gas outlet end of the compressed gas cylinder 1, and an air inlet pipe is fixedly connected to the gas outlet end of the pressure regulating valve 6. The air inlet pipe extends into the storage barrel 2 and communicates with the space between the push plate and the partition. A gas pressure sensor 7 is installed on the air inlet pipe, wherein the pressure regulating valve 6 controls the amount of gas driving the piston 3, thereby affecting the pushing effect of the piston 3 on the tracking particle 11.

[0022] As a preferred embodiment of this embodiment, a transverse plate is fixedly connected to the right end of the push rod, and a displacement sensor 4 is installed on the side of the transverse plate facing the driving cavity, and the displacement sensor 4 is directly opposite to the transverse plate.

[0023] As a preferred embodiment of this embodiment, a sealing rubber ring is provided at the connection between the partition plate and the push rod.

[0024] As a preferred embodiment of the present invention, the pressure range of the compressed gas cylinder 1 is 0.6 MPa - 10 MPa, which is suitable for use at different depths and can adapt to working conditions at an equivalent water depth of 0 m-500 m. The pressure is adjusted according to the use environment. For example, when in shallow waters and with a low requirement for particle spreading speed, the pressure can be set at around 0.6 MPa; while in deep waters or when particles need to be spread quickly, the pressure can be adjusted to a higher value, such as 10 MPa. As a preferred embodiment of this embodiment, the speed at which the compressed gas cylinder 1 and the piston 3 push and spread the tracking particles 11 is 0.1kg / h - 1.0kg / h to adapt to different flow speeds.

[0025] As a preferred embodiment of the present invention, the storage capacity of the tracking particles 11 in the storage barrel 2 is 5kg - 10kg, which meets the working requirement of continuous working for 5 hours.

[0026] As a preferred embodiment of this embodiment, a fairing 9 is installed on the mounting frame 8, and the fairing 9 is used to reduce the influence of the particle spreading device on the original fluid.

[0027] As a preferred embodiment of the present invention, a pressure balancing port is provided at the front end of the material storage barrel 2, and the pressure balancing port is used to ensure that the front cavity of the material storage barrel 2 is balanced with the external water pressure.

[0028] The particle spreading device of the present invention is also equipped with a controller, and the electrically controlled switch valve 5, the pressure regulating valve 6, the gas pressure sensor 7, and the displacement sensor 4 are all electrically connected to the controller.

[0029] The operation process of the particle spreading device for underwater flow field tracking in this embodiment is as follows: First, the mounting frame 8 is mounted on the outside of the ship or diving equipment through the external connection interface of the mounting frame 8. The control principle of the particle spreading device of this embodiment is as follows: Figure 3 As shown, when the particle spreading device starts to work, the electric control switch valve 5 is first opened, and then the pressure regulating valve 6 is opened and adjusted by the controller to release the driving gas, and the driving gas in the compressed gas cylinder 1 enters the storage barrel 2 through the pressure regulating valve 6 and the air inlet pipe, thereby driving the piston 3 to move outward. The piston 3 moves outward under the action of the driving gas, pushing the tracking particles 11 to be spread out from the storage barrel 2.

[0030] During the process of the piston 3 pushing and spreading the tracking particles 11, the spreading speed of the tracking particles 11 is adjusted by a closed-loop control system. The closed-loop control system includes a displacement sensor 4, a pressure regulating valve 6, and an electrically controlled switch valve 5. The displacement sensor 4 monitors the capacity of the storage barrel 2 and feeds back the movement speed of the piston 3. The pressure regulating valve 6 is used as an actuator for the system to control the movement speed of the piston 3, thereby controlling the particle spreading speed to vary between 0.1 kg / h and 1.0 kg / h to adapt to different flow speeds. For example, when the external fluid flows faster, the piston 3 movement speed can be increased by the pressure regulating valve 6 to make the particle spreading speed close to 1.0 kg / h; when the external fluid flows slower, the piston 3 movement speed can be reduced to make the particle spreading speed close to 0.1 kg / h.

[0031] The electric control switch valve 5 is linked with the pressure regulating valve 6 and is opened synchronously when the pressure regulating valve 6 works, so that the tracking particles 11 in the storage barrel 2 can be dispersed into the external flow field and mixed with the external fluid.

[0032] After the tracking particles 11 are mixed with the external fluid, the movement of the particles in the fluid is recorded by a matching video tracking device, and the movement state of each particle is determined by a video analysis algorithm, thereby obtaining an accurate flow state of the fluid. For example, the video tracking device can be an underwater camera, which can clearly capture the movement trajectory of the tracking particles 11, and then use special video analysis software to analyze these trajectories, calculate the speed, acceleration and other parameters of the tracking particles 11, and then infer the flow state information such as the flow rate and flow direction of the fluid. Example 2.

[0033] like Figure 4 As shown, this embodiment provides a particle spreading device for underwater flow field tracking, which is different from the first embodiment in that: in this embodiment, an isolation tube 12 is provided in the driving chamber to wrap the push rod, the horizontal plate and the displacement sensor 4, the left end of the isolation tube 12 is fixedly connected to the partition, the right end of the isolation tube 12 is fixedly connected to the storage barrel 2, and an air pump 13 and a gas pressure sensor 7 are installed on the outside of the isolation tube 12, and the air inlet end of the air pump 13 is connected to an air suction pipe, and a one-way valve is provided in the air suction pipe. The air suction pipe runs through the partition and communicates with the space between the push plate and the partition. A waterproof stepping motor 14 and a bracket are installed on the right inner wall of the isolation tube 12, and a rotating shaft is rotatably connected to the bracket, and a take-up wheel 15 is fixedly connected to the rotating shaft, and a pull rope is wound around the take-up wheel 15, and the free end of the pull rope is fixedly connected to the right end of the push rod, and the output end of the waterproof stepping motor 14 is fixedly connected to the rotating shaft. The remaining structures of this embodiment are the same as those of the first embodiment. The air pump 13, the gas pressure sensor 7 and the waterproof stepping motor 14 in this embodiment are also electrically connected to the controller.

[0034] This embodiment is also provided with a feed pipe connected to the storage chamber of the storage barrel 2, the other end of the feed pipe extends into a feeder placed in a ship or diving equipment, and a solenoid valve is installed at one end of the feed pipe close to the storage barrel 2.

[0035] The particle spreading process of this embodiment is the same as that of embodiment 1. The difference is that after the particle spreading is completed, rapid filling is required. The filling process is as follows: Close the pressure regulating valve 6, start the vacuum pump 13, under the negative pressure suction of the vacuum pump 13, the driving gas between the push plate and the partition enters the driving chamber through the vacuum pipe and the one-way valve, the air pressure between the push plate and the partition is reduced, and under the action of the underwater high pressure environment, the piston 3 and the push plate move to the right. In order to further enhance the movement rate and movement effect of the piston 3 and the push plate, start the waterproof stepping motor 14, the waterproof stepping motor 14 drives the rotating shaft and the take-up wheel 15 to rotate, so that the pull rope is contracted and wound on the take-up wheel 15, and the contraction of the pull rope drives the push rod, the push plate and the piston 3 to move to the right synchronously until the piston 3 is reset to the far right. Then close the electric control switch valve 5, open the solenoid valve of the feeding pipe, and fill the storage chamber through the feeder and the feeding pipe; or open the sealing cover and fill the storage chamber through the loading port 10.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the protection scope of the present invention.

Claims

1. A particle spreading device for underwater flow field tracking, characterized in that: The invention comprises a mounting frame (8), a material storage barrel (2) and a compressed gas cylinder (1) arranged on the mounting frame (8), the side of the mounting frame (8) being provided with an external connection interface, a partition being provided inside the material storage barrel (2), the partition dividing the material storage barrel into a material storage chamber and a drive chamber, a tracking particle (11) and a push plate which is in airtight sliding connection with the inner wall of the material storage chamber being placed inside the material storage chamber, a piston (3) being fixedly connected to the side of the push plate facing the tracking particle (11), and a piston (3) being provided on the side of the push plate away from the piston (3) and penetrating through the partition and extending into the drive chamber. The push rod of the dynamic chamber, the end of the material storage chamber away from the driving chamber is provided with a discharge port, the discharge port is installed with an electric control switch valve (5), the outer side of the material storage barrel (2) is provided with a loading port (10) communicating with the material storage chamber, the loading port (10) is provided with a sealing cover, the gas outlet end of the compressed gas cylinder (1) is installed with a pressure regulating valve (6), the gas outlet end of the pressure regulating valve (6) is fixedly connected with an air inlet pipe, the air inlet pipe extends into the material storage barrel (2) and communicates with the space between the push plate and the partition plate, and the air inlet pipe is provided with a gas pressure sensor (7); The particle spreading device is also equipped with a controller, and the electrically controlled switch valve (5), the pressure regulating valve (6), and the gas pressure sensor (7) are all electrically connected to the controller.

2. A particle spreading device for underwater flow field tracking according to claim 1, characterized in that: One end of the push rod away from the push plate is fixedly connected to a transverse plate, and a displacement sensor (4) is provided on the side of the transverse plate facing the drive cavity, and the displacement sensor (4) is directly opposite to the transverse plate.

3. A particle spreading device for underwater flow field tracking according to claim 2, characterized in that: A sealing rubber ring is arranged at the connection between the partition plate and the push rod.

4. A particle spreading device for underwater flow field tracking according to claim 3, characterized in that: An isolating tube (12) enclosing the push rod, the horizontal plate and the displacement sensor (4) is provided in the driving chamber, one end of the isolating tube (12) is fixedly connected to the partition, and the end of the isolating tube (12) away from the partition is fixedly connected to the storage barrel (2), an air pump (13) and a gas pressure sensor are provided on the outside of the isolating tube (12), the air inlet end of the air pump (13) is connected to an air suction pipe, a one-way valve is provided in the air suction pipe, and the air suction pipe passes through the partition and communicates with the space between the push plate and the partition.

5. A particle spreading device for underwater flow field tracking according to claim 4, characterized in that: A waterproof stepping motor (14) and a bracket are arranged in the isolation cylinder (12); a rotating shaft is arranged on the bracket; a take-up wheel (15) is arranged on the rotating shaft; a pull rope is wound around the take-up wheel (15); a free end of the pull rope is fixedly connected to a push rod; and an output end of the waterproof stepping motor (14) is fixedly connected to the rotating shaft.

6. A particle spreading device for underwater flow field tracking according to claim 1, characterized in that: The pressure range of the compressed gas cylinder (1) is 0.6 MPa - 10 MPa.

7. A particle spreading device for underwater flow field tracking according to claim 1, characterized in that: The compressed gas cylinder (1) and the piston (3) push and spread the tracking particles (11) at a speed of 0.1 kg / h - 1.0 kg / h.

8. The particle spreading device for underwater flow field tracking according to claim 1, characterized in that: The storage volume of the tracking particles (11) in the storage barrel (2) is 5kg to 10kg.

9. A particle spreading device for underwater flow field tracking according to claim 1, characterized in that: The installation frame (8) is provided with a fairing (9), and the fairing (9) is used to reduce the impact of the particle spreading device on the original fluid.

10. The particle spreading device for underwater flow field tracking according to claim 1, characterized in that: The front end of the material storage barrel (2) is provided with a pressure balancing port.

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