Doppler current meter

Abstract

The invention discloses a Doppler current meter, and relates to the technical field of flow velocity measurement equipment. The Doppler current meter comprises a sensor module and a host, a connecting wire is arranged on one side of the sensor module, the end, away from the sensor module, of the connecting wire is connected with the host, the sensor module comprises a protective shell, and a high-frequency transducer, a low-frequency transducer and two acoustic isolation walls are fixedly installed in the protective shell. Independent acoustic windows are fixedly mounted at the front ends of the high-frequency transducer and the low-frequency transducer, a self-cleaning device is arranged on a front panel of the protective shell and comprises a first shell and a motor, a rotating shaft is fixedly connected to the output end of the motor, a first gear is fixedly connected to the outer surface of the rotating shaft, a first guide rail is fixedly mounted on the inner wall of the first shell, and a second guide rail is fixedly mounted on the inner wall of the first guide rail. The adaptability of equipment under different water flow conditions is improved, pollutants such as algae and silt are prevented from being attached to the acoustic window, and flexible adjustment of the measurement angle and depth is achieved.

Description

Technical Field

[0001] This invention relates to the field of flow velocity measurement equipment technology, specifically a Doppler flow meter. Background Technology

[0002] Doppler current meters, as important equipment in hydrological measurements, are widely used for flow velocity monitoring in rivers, canals, and pipelines. Their core working principle stems from the Doppler effect in physics, which states that when there is relative motion between a sound wave or electromagnetic wave source and an observer, the frequency of the received wave changes. Specifically, in measurement, the instrument emits ultrasonic waves of a specific frequency into the water. When these sound waves encounter suspended particles or bubbles moving with the water flow, they are scattered, and some of the energy is reflected back to the receiving probe. Due to the relative motion between the scattering object and the instrument, the frequency of this echo will shift slightly compared to the emitted frequency (i.e., the Doppler frequency shift). By accurately measuring this frequency shift, the velocity of the water flow along the direction of the sound beam can be directly calculated using a formula.

[0003] Traditional Doppler current meters mostly use single-frequency transducers for measurement, which have poor adaptability to complex water flow environments, especially in scenarios where high and low flow velocities alternate, which can easily lead to measurement deviations. In addition, when the sensor is used in water for a long time, algae, silt and other pollutants easily adhere to the surface of its acoustic window, which seriously affects the transmission and reception efficiency of sound waves and leads to measurement data distortion. In terms of installation and debugging, existing equipment often lacks flexible angle and height adjustment mechanisms, making it difficult to optimize the layout according to the actual water flow direction and depth, thus affecting the representativeness and accuracy of the measurement. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a Doppler current meter that solves the problems mentioned in the background art regarding traditional Doppler current meters in complex water flow environments, such as poor adaptability of single-frequency transducers, large measurement deviations when high and low flow velocities alternate, data distortion caused by algae and sediment contamination of the acoustic window, and lack of flexible angle and height adjustment mechanisms.

[0005] To solve the above problems, the present invention provides the following technical solution: A Doppler current meter, comprising a sensor module and a main unit, wherein a connecting wire is provided on one side of the sensor module, and the end of the connecting wire away from the sensor module is connected to the main unit; the sensor module includes a protective housing, and a high-frequency transducer, a low-frequency transducer, and two acoustic isolation walls are fixedly installed inside the protective housing; each of the high-frequency and low-frequency transducers has an independent acoustic window fixedly installed at its front end; a self-cleaning device is provided on the front panel of the protective housing, the self-cleaning device comprising a first housing and a motor; a rotating shaft is fixedly connected to the output end of the motor, and a first gear is fixedly connected to the outer surface of the rotating shaft; a first guide rail is fixedly installed on the inner wall of the first housing. The outer surface of the first guide rail is slidably connected to a first rack. An angle adjustment device is provided on one side of the protective housing. The angle adjustment device includes a second housing. A fixed sleeve is fixedly connected inside the second housing. A first rotating rod is rotatably connected inside the fixed sleeve. A drive gear is fixedly connected to one end of the first rotating rod. A bearing is fixedly installed on the inner surface of the second housing. An annular gear ring is fixedly provided inside the bearing. A connecting seat is fixedly connected to the outer surface of the second housing. A through hole is opened inside the connecting seat. A vertical rod is sleeved inside the through hole. A limiting device is fixedly connected to the upper surface of the connecting seat. The limiting device includes a third housing. A first U-shaped rod and a second U-shaped rod are respectively provided on both sides of the third housing.

[0006] Preferably, the protective housing includes an outer protective layer, a damping layer, and an inner lining layer. The damping layer is disposed on the inner surface of the outer protective layer, the inner lining layer is disposed on the inner surface of the inner lining layer, and a through groove is provided at the bottom of the front end of the protective housing.

[0007] Preferably, the outer surface of the first housing is fixedly connected to the front panel of the protective housing, the motor is fixedly installed in the inner cavity of the protective housing, the two acoustic isolation walls are disposed between the high-frequency transducer and the low-frequency transducer, and the motor is disposed between the two acoustic isolation walls.

[0008] Preferably, a first sealing ring is fixedly provided in the through hole of the front panel of the protective housing, the rotating shaft passes through the first sealing ring and extends into the inner cavity of the first housing, the first gear is disposed in the inner cavity of the first housing, the first gear meshes with the first rack, and the outer surface of the first rack passes through the through hole at the bottom of the first housing.

[0009] Preferably, a connecting frame is fixedly connected to the bottom end of the first rack, and both ends of the connecting frame are provided with arc-shaped portions. The two arc-shaped portions are respectively located on the outside of the two independent sound windows, and a cleaning brush is fixedly installed on the side of the two arc-shaped portions near the independent sound windows.

[0010] Preferably, a plurality of fixing rods are fixedly connected to the outer surface of the annular gear ring, and the ends of the plurality of fixing rods away from the annular gear ring are fixedly connected to the outer surface of the protective housing. The drive gear meshes with the annular gear ring, and a sealing gasket is fixedly connected to the side of the second housing near the protective housing. The side of the sealing gasket away from the second housing is in close contact with the outer surface of the protective housing.

[0011] Preferably, a movable sleeve is fitted at the end of the first rotating rod away from the drive gear, a first rotating block is fixedly connected to the end of the movable sleeve, a limiting gear is fixedly connected to the outer surface of the movable sleeve, a limiting tooth groove is formed on the outer surface of the second housing, the limiting gear meshes with the limiting tooth groove, a fixing block is fixedly connected to the inner surface of the movable sleeve, a guide groove is formed on the outer surface of the first rotating rod, and the fixing block is slidably disposed inside the guide groove.

[0012] Preferably, the bottom of the third housing is fixedly connected to the upper surface of the connecting seat, and the inner wall of the third housing of the connecting seat is fixedly connected to a second guide rail and a third guide rail. The second guide rail and the third guide rail are arranged opposite to each other. A second rack is slidably connected to the outer surface of the second guide rail, and a third rack is slidably connected to the outer surface of the third guide rail. One end of the first U-shaped rod is fixedly connected to the end of the second rack, and one end of the second U-shaped rod is fixedly connected to the end of the third rack.

[0013] Preferably, a second rotating rod is rotatably connected inside the third housing, the top end of the second rotating rod penetrates the top of the third housing, a second rotating block is fixedly connected to the top end of the second rotating rod, a second gear is fixedly connected to the outer surface of the second rotating rod, the second rack and the third rack both mesh with the second gear, a second sealing ring and a third sealing ring are respectively provided in the through holes on both sides of the third housing, the outer surface of the first U-shaped rod penetrates the second sealing ring, and the outer surface of the second U-shaped rod penetrates the third sealing ring.

[0014] Preferably, a first spring is fitted on the outer surface of the first U-shaped rod, and the two ends of the first spring are respectively fixedly connected to the inner wall of the third housing and the end of the second rack. A second spring is fitted on the outer surface of the second U-shaped rod, and the two ends of the second spring are respectively fixedly connected to the inner wall of the third housing and the end of the third rack. The outer surface of the upright is provided with multiple scale lines, and the outer surface of the upright is provided with multiple limiting holes. The limiting holes are symmetrically arranged on both sides of the upright, and the interior of the limiting holes is adapted to the outer surfaces of the first U-shaped rod and the second U-shaped rod. Multiple support feet are fixedly connected to the lower part of the outer surface of the upright. Beneficial effects

[0015] This invention provides a Doppler current meter. It has the following beneficial effects: 1. This Doppler current meter, by setting up high-frequency and low-frequency transducers and combining them with an acoustic isolation wall structure, effectively expands the range of flow velocity measurement and improves the adaptability of the equipment under different water flow conditions. The high-frequency transducer is suitable for high flow velocity environments, while the low-frequency transducer is suitable for low flow velocity environments. The two work together to overcome the limitations of a single-frequency transducer in complex flow velocity scenarios. At the same time, the acoustic isolation wall effectively suppresses signal interference between transducers, improving the accuracy and stability of the measurement.

[0016] 2. This Doppler current meter features a self-cleaning device. A motor-driven rack and pinion mechanism uses a cleaning brush to reciprocate and clean the independent acoustic window, effectively preventing algae, silt, and other pollutants from adhering to the acoustic window and ensuring efficient sound wave transmission. The device has a compact structure, stable operation, and can be started automatically or at set times, reducing the frequency of manual maintenance, extending the service life of the equipment, and ensuring the reliability and continuity of long-term monitoring data.

[0017] 3. This Doppler current meter, through the setting of an angle adjustment device, allows users to rotate the first rotating block to drive the gear and the ring gear to rotate the entire sensor module, thereby achieving flexible adjustment of the measurement angle. The mechanism is equipped with a limit gear and tooth groove meshing structure, which can reliably lock the angle after adjustment, ensuring that the sensor is always aligned with the water flow direction, adapting to different installation environments, and significantly improving the representativeness of the measurement and the accuracy of the data.

[0018] 4. This Doppler current meter, through the setting of a limiting device and a vertical rod structure with scale lines and limiting holes, achieves rapid adjustment and precise positioning of the sensor module height. Users rotate the second rotating block to drive the gear and rack mechanism, causing the U-shaped rod to insert or retract from the limiting hole. Combined with the spring automatic reset function, operation is simple and reliable. This structure not only facilitates flexible sensor placement according to water depth but also enhances the adaptability and stability of the equipment during on-site installation. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the sensor module of the present invention; Figure 3 This is a cross-sectional structural schematic diagram of the protective casing of the present invention; Figure 4 This is a schematic diagram of the self-cleaning device of the present invention; Figure 5 This is a schematic diagram of the self-cleaning device of the present invention from a second perspective. Figure 6 This is a schematic diagram of the angle adjustment device of the present invention; Figure 7 This is a cross-sectional structural schematic diagram of the angle adjustment device of the present invention; Figure 8 This is a schematic diagram of the limiting device of the present invention; Figure 9 This is a schematic diagram of the internal structure of the third housing of the present invention.

[0020] In the diagram: 1. Sensor module; 101. Protective housing; 1011. Outer protective layer; 1012. Damping layer; 1013. Inner lining layer; 102. High-frequency transducer; 103. Low-frequency transducer; 104. Independent acoustic window; 105. Through slot; 106. Acoustic isolation wall; 2. Main unit; 3. Upright pole; 4. Connecting wire; 5. Self-cleaning device; 501. First housing; 502. Motor; 503. Rotating shaft; 504. First gear; 505. First guide rail; 506. First rack; 507. Connecting frame; 508. Arc-shaped part; 509. Cleaning brush; 510. First sealing ring; 6. Angle adjustment device; 601. Second housing; 602. Fixing sleeve; 603. First rotating rod; 604. Drive gear; 6 05. Bearing; 606. Ring gear; 607. Fixing rod; 608. Sealing gasket; 609. Movable sleeve; 610. First rotating block; 611. Limiting gear; 612. Limiting tooth groove; 613. Guide groove; 614. Fixing block; 7. Connecting seat; 8. Limiting device; 801. Third housing; 802. Second rotating rod; 803. Second rotating block; 804. Second gear; 805. Second guide rail; 806. Third guide rail; 807. Second rack; 808. Third rack; 809. First U-shaped rod; 810. Second U-shaped rod; 811. Second sealing ring; 812. Third sealing ring; 813. First spring; 814. Second spring; 9. Through hole; 10. Support leg; 11. Limiting hole; 12. Scale line. Detailed Implementation

[0021] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the invention to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical application of the invention, and to enable those skilled in the art to understand the invention and design various embodiments with various modifications suitable for a particular purpose. Example

[0022] like Figures 1-9As shown, the present invention provides a technical solution: a Doppler current meter, including a sensor module 1 and a host 2. A connecting wire 4 is provided on one side of the sensor module 1, and the end of the connecting wire 4 away from the sensor module 1 is connected to the host 2. The sensor module 1 includes a protective housing 101. A high-frequency transducer 102, a low-frequency transducer 103, and two acoustic isolation walls 106 are fixedly installed inside the protective housing 101. Independent acoustic windows 104 are fixedly installed at the front ends of the high-frequency transducer 102 and the low-frequency transducer 103. A self-cleaning device 5 is provided on the front panel of the protective housing 101. The self-cleaning device 5 includes a first housing 501 and a motor 502. A rotating shaft 503 is fixedly connected to the output end of the motor 502. A first gear 504 is fixedly connected to the outer surface of the rotating shaft 503. A first guide rail 505 is fixedly installed on the inner wall of the first housing 501. A first rack 506 is slidably connected to the outer surface of the rail 505. An angle adjustment device 6 is provided on one side of the protective housing 101. The angle adjustment device 6 includes a second housing 601. A fixed sleeve 602 is fixedly connected inside the second housing 601. A first rotating rod 603 is rotatably connected inside the fixed sleeve 602. A drive gear 604 is fixedly connected to one end of the first rotating rod 603. A bearing 605 is fixedly installed on the inner surface of the second housing 601. An annular gear ring 606 is fixedly provided inside the bearing 605. A connecting seat 7 is fixedly connected to the outer surface of the second housing 601. A through hole 9 is opened inside the connecting seat 7. A vertical rod 3 is sleeved inside the through hole 9. A limiting device 8 is fixedly connected to the upper surface of the connecting seat 7. The limiting device 8 includes a third housing 801. A first U-shaped rod 809 and a second U-shaped rod 810 are respectively provided on both sides of the third housing 801.

[0023] The protective housing 101 includes an outer protective layer 1011, a damping layer 1012, and an inner liner 1013. The damping layer 1012 is disposed on the inner surface of the outer protective layer 1011, and the inner liner 1013 is disposed on the inner surface of the inner liner 1013. A through groove 105 is provided at the bottom of the front end of the protective housing 101. The outer protective layer 1011 provides mechanical protection and corrosion resistance, the damping layer 1012 reduces vibration and noise transmission, the inner liner 1013 enhances internal support and sound wave management, and the through groove 105 is used to discharge dirt swept off by the self-cleaning device 5.

[0024] The outer surface of the first housing 501 is fixedly connected to the front panel of the protective housing 101. The motor 502 is fixedly installed in the inner cavity of the protective housing 101. Two acoustic isolation walls 106 are disposed between the high-frequency transducer 102 and the low-frequency transducer 103. The motor 502 is disposed between the two acoustic isolation walls 106. The motor 502 drives the cleaning device to operate. The acoustic isolation walls 106 isolate the acoustic interference between the high-frequency transducer 102 and the low-frequency transducer 103 to ensure signal accuracy.

[0025] A first sealing ring 510 is fixedly installed in the through hole of the front panel of the protective housing 101. The rotating shaft 503 passes through the first sealing ring 510 and extends into the inner cavity of the first housing 501. The first gear 504 is disposed in the inner cavity of the first housing 501. The first gear 504 meshes with the first rack 506. The outer surface of the first rack 506 passes through the through hole at the bottom of the first housing 501. The first sealing ring 510 ensures the sealing when the rotating shaft 503 passes through, preventing water from entering. The rotating shaft 503 transmits the rotational motion of the motor 502. The first gear 504 converts the rotation into the linear motion of the first rack 506. The first rack 506 drives the cleaning brush 509 to move.

[0026] A connecting frame 507 is fixedly connected to the bottom end of the first rack 506. Both ends of the connecting frame 507 are provided with arc-shaped portions 508. The two arc-shaped portions 508 are respectively located on the outside of the two independent sound windows 104. A cleaning brush 509 is fixedly installed on the side of the two arc-shaped portions 508 near the independent sound window 104. The connecting frame 507 connects the first rack 506 and the cleaning brush 509. The arc-shaped portions 508 are adapted to the contour of the independent sound window 104. The cleaning brush 509 removes dirt from the surface of the independent sound window 104 and maintains the sound wave transmission efficiency.

[0027] Multiple fixing rods 607 are fixedly connected to the outer surface of the annular gear ring 606. The ends of the fixing rods 607 away from the annular gear ring 606 are fixedly connected to the outer surface of the protective housing 101. The drive gear 604 meshes with the annular gear ring 606. A sealing gasket 608 is fixedly connected to the side of the second housing 601 near the protective housing 101. The side of the sealing gasket 608 away from the second housing 601 is in close contact with the outer surface of the protective housing 101. The drive gear 604 transmits rotational force to the annular gear ring 606. The annular gear ring 606 drives the protective housing 101 to rotate through the fixing rods 607 to adjust the angle. The sealing gasket 608 ensures the seal between the second housing 601 and the protective housing 101 to prevent moisture from entering.

[0028] A movable sleeve 609 is fitted onto the end of the first rotating rod 603 furthest from the drive gear 604. A first rotating block 610 is fixedly connected to the end of the movable sleeve 609. A limiting gear 611 is fixedly connected to the outer surface of the movable sleeve 609. A limiting tooth groove 612 is formed on the outer surface of the second housing 601. The limiting gear 611 meshes with the limiting tooth groove 612. A fixing block 614 is fixedly connected to the inner surface of the movable sleeve 609. A guide groove 613 is formed on the outer surface of the first rotating rod 603. The fixing block 614 is slidably disposed inside the guide groove 613. When the limiting gear 611 meshes with the limiting tooth groove 612, it is used to fix the angle. The fixing block 614 and the guide groove 613 realize the sliding and rotational transmission of the movable sleeve 609, ensuring the stability and reliability of angle adjustment.

[0029] The bottom of the third housing 801 is fixedly connected to the upper surface of the connecting seat 7. The inner wall of the third housing 801 of the connecting seat 7 is fixedly connected to the second guide rail 805 and the third guide rail 806. The second guide rail 805 and the third guide rail 806 are arranged opposite to each other. The outer surface of the second guide rail 805 is slidably connected to the second rack 807. The outer surface of the third guide rail 806 is slidably connected to the third rack 808. One end of the first U-shaped rod 809 is fixedly connected to the end of the second rack 807. One end of the second U-shaped rod 810 is fixedly connected to the end of the third rack 808. The third housing 801 is used to accommodate the limiting component. The second guide rail 805 and the third guide rail 806 are used to guide the second rack 807 and the third rack 808 to slide.

[0030] The third housing 801 is internally rotatably connected to a second rotating rod 802. The top end of the second rotating rod 802 penetrates the top of the third housing 801. A second rotating block 803 is fixedly connected to the top end of the second rotating rod 802. A second gear 804 is fixedly connected to the outer surface of the second rotating rod 802. The second rack 807 and the third rack 808 both mesh with the second gear 804. The through holes on both sides of the third housing 801 are respectively provided with a second sealing ring 811 and a third sealing ring 812. The outer surface of the first U-shaped rod 809 penetrates the second sealing ring 811, and the outer surface of the second U-shaped rod 810 penetrates the third sealing ring 812. The second gear 804 is used to synchronously drive the second rack 807 and the third rack 808. The second sealing ring 811 and the third sealing ring 812 ensure the sealing of the first U-shaped rod 809 and the second U-shaped rod 810 when they move, preventing water intrusion.

[0031] A first spring 813 is fitted on the outer surface of the first U-shaped rod 809. The two ends of the first spring 813 are fixedly connected to the inner wall of the third housing 801 and the end of the second rack 807, respectively. A second spring 814 is fitted on the outer surface of the second U-shaped rod 810. The two ends of the second spring 814 are fixedly connected to the inner wall of the third housing 801 and the end of the third rack 808, respectively. The outer surface of the upright rod 3 is provided with multiple scale lines 12. Multiple limiting holes 11 are opened on the outer surface of the upright rod 3. The limiting holes 11 are symmetrically arranged on both sides of the upright rod 3. The interior of the limiting holes 11 is adapted to the outer surfaces of the first U-shaped rod 809 and the second U-shaped rod 810. Multiple support legs 10 are fixedly connected to the lower part of the outer surface of the upright rod 3. The first spring 813 and the second spring 814 provide elastic force to make the first U-shaped rod 809 and the second U-shaped rod 810 automatically reset and insert into the limiting holes 11. The scale lines 12 indicate the height position for easy reading. The limiting holes 11 cooperate with the U-shaped rod to fix the height.

[0032] The working principle of the above embodiments: In use, first adjust the height of sensor module 1 on the upright 3 and lock it using the limiting device 8. Then, adjust the angle of sensor module 1 using the angle adjustment device 6 to adapt it to the water flow direction. Place the upright 3 securely in the water using the support legs 10. Next, sensor module 1 and the main unit 2 work together to measure the water flow velocity. When measuring flow velocity, sensor module 1 can select either a high-frequency transducer 102 or a low-frequency transducer 103 to emit sound wave signals into the water as needed. The sound waves are reflected when they encounter suspended particles or bubbles in the water, generating echo signals. Due to the Doppler effect... There is a frequency offset between the echo signal and the transmitted signal. This offset is proportional to the water flow velocity. The host 2 receives the echo signal through the connecting wire 4 and calculates the frequency offset to accurately calculate the water flow velocity. The high-frequency transducer 102 is suitable for high flow velocity measurement, and the low-frequency transducer 103 is suitable for low flow velocity measurement. The combination of the two expands the measurement range of this device. The acoustic isolation wall 106 effectively isolates the acoustic interference between the high-frequency transducer 102 and the low-frequency transducer 103 to ensure signal accuracy. The independent acoustic window 104 protects the transducer's measuring head and allows for efficient acoustic wave transmission.

[0033] The self-cleaning device 5 can be used to automatically clean the surface of the independent sound window 104 to prevent dirt from adhering and affecting the sound wave transmission. When the motor 502 is started, it drives the rotating shaft 503 to rotate. The first gear 504 on the rotating shaft 503 rotates accordingly. The first gear 504 meshes with the first rack 506. The first rack 506 slides along the first guide rail 505. The up and down movement of the first rack 506 drives the cleaning brush 509 to move along the surface of the independent sound window 104 to remove dirt. The first sealing ring 510 ensures the sealing of the rotating shaft 503 when it passes through the protective housing 101 to prevent water from entering.

[0034] The angle adjustment device 6 can be used to adjust the measurement angle of the sensor module 1 to adapt to different water flow directions. During operation, the user first pulls the fixed block 614 inside the movable sleeve 609 outward from the first rotating block 610, moving it along the guide groove 613 so that the limiting gear 611 leaves the limiting tooth groove 612. Then, the user rotates the first rotating block 610, driving the movable sleeve 609 to rotate. The movable sleeve 609 is slidably connected to the guide groove 613 of the first rotating rod 603 through the fixed block 614, causing the first rotating rod 603 to rotate. The driving gear 604 rotates accordingly. When the driving gear 604 rotates, it drives the ring gear 606 to rotate. Under the connection of the fixed rod 607, it drives the protective housing 101 to rotate as a whole, thereby changing the angle of the sensor module 1. After the angle is adjusted, the user pushes the first rotating block 610 so that the limiting gear 611 enters the limiting tooth groove 612 and meshes with it, fixing the angle position of the sensor module 1. The sealing gasket 608 ensures the seal between the second housing 601 and the protective housing 101.

[0035] The limiting device 8 can be used to fix the sensor module 1 to the required height position on the upright 3 via the connecting seat 7. During operation, the user rotates the second rotating block 803, which drives the second rotating rod 802 and the second gear 804 to rotate. The second gear 804 simultaneously meshes with the second rack 807 and the third rack 808, causing the second rack 807 and the third rack 808 to slide in opposite directions along the second guide rail 805 and the third guide rail 806, respectively. When the second rack 807 and the third rack 808 slide, they drive the first U-shaped rod 809 and the second U-shaped rod 810 to leave the limiting hole 11. At this time, the first spring 813 is compressed by the second rack 807, and the second spring 814 is compressed by the third rack 807. The compression of spring 813 causes the first spring 813 and the second spring 814 to deform and store force. Then, the sensor module 1 moves up and down along the upright 3 until it reaches the required height. The first U-shaped rod 809 and the second U-shaped rod 810 are aligned with the limiting hole 11 at the required height. The second rotating block 803 is released. Under the elastic force of the first spring 813 and the second spring 814, the first U-shaped rod 809 and the second U-shaped rod 810 are reset and inserted into the limiting hole 11 at the corresponding position on the upright 3 to achieve fixation. The scale line 12 corresponds to the limiting hole 11, which makes it easy for the user to read the height position. The support leg 10 is used to stabilize the upright 3. The second sealing ring 811 and the third sealing ring 812 ensure the sealing when the U-shaped rod moves.

[0036] Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art and related fields based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described and explained in the present invention, unless otherwise specified or limited, shall be implemented according to conventional means in the art.

Claims

1. A Doppler current meter, comprising a sensor module (1) and a main unit (2), characterized in that: A connecting wire (4) is provided on one side of the sensor module (1). The end of the connecting wire (4) away from the sensor module (1) is connected to the host (2). The sensor module (1) includes a protective housing (101). A high-frequency transducer (102), a low-frequency transducer (103), and two acoustic isolation walls (106) are fixedly installed inside the protective housing (101). Independent acoustic windows (106) are fixedly installed at the front ends of the high-frequency transducer (102) and the low-frequency transducer (103). 4) The front panel of the protective housing (101) is provided with a self-cleaning device (5). The self-cleaning device (5) includes a first housing (501) and a motor (502). The output end of the motor (502) is fixedly connected to a rotating shaft (503). A first gear (504) is fixedly connected to the outer surface of the rotating shaft (503). A first guide rail (505) is fixedly installed on the inner wall of the first housing (501). A first rack (506) is slidably connected to the outer surface of the first guide rail (505). An angle adjustment device (6) is provided on one side of the protective housing (101). The angle adjustment device (6) includes a second housing (601). A fixed sleeve (602) is fixedly connected inside the second housing (601). A first rotating rod (603) is rotatably connected inside the fixed sleeve (602). A drive gear (604) is fixedly connected to one end of the first rotating rod (603). A bearing (605) is fixedly installed on the inner surface of the second housing (601). An annular gear ring (606) is fixedly provided inside the bearing (605). A connecting seat (7) is fixedly connected to the outer surface of the second housing (601). A through hole (9) is opened inside the connecting seat (7). A vertical rod (3) is sleeved inside the through hole (9). A limiting device (8) is fixedly connected to the upper surface of the connecting seat (7). The limiting device (8) includes a third housing (801). A first U-shaped rod (809) and a second U-shaped rod (810) are respectively provided on both sides of the third housing (801).

2. The Doppler current meter according to claim 1, characterized in that: The protective housing (101) includes an outer protective layer (1011), a damping layer (1012), and an inner lining layer (1013). The damping layer (1012) is disposed on the inner surface of the outer protective layer (1011), and the inner lining layer (1013) is disposed on the inner surface of the inner lining layer (1013). A through groove (105) is provided at the bottom of the front end of the protective housing (101).

3. A Doppler current meter according to claim 1, characterized in that: The outer surface of the first housing (501) is fixedly connected to the front panel of the protective housing (101), the motor (502) is fixedly installed in the inner cavity of the protective housing (101), the two acoustic isolation walls (106) are disposed between the high frequency transducer (102) and the low frequency transducer (103), and the motor (502) is disposed between the two acoustic isolation walls (106).

4. A Doppler current meter according to claim 1, characterized in that: The protective housing (101) has a first sealing ring (510) fixedly installed in the through hole of the front panel. The rotating shaft (503) passes through the first sealing ring (510) and extends into the inner cavity of the first housing (501). The first gear (504) is installed in the inner cavity of the first housing (501). The first gear (504) meshes with the first rack (506). The outer surface of the first rack (506) passes through the through hole at the bottom of the first housing (501).

5. A Doppler current meter according to claim 1, characterized in that: The bottom end of the first rack (506) is fixedly connected to a connecting frame (507). Both ends of the connecting frame (507) are provided with arc-shaped parts (508). The two arc-shaped parts (508) are respectively located on the outside of the two independent sound windows (104). A cleaning brush (509) is fixedly installed on the side of the two arc-shaped parts (508) near the independent sound window (104).

6. A Doppler current meter according to claim 1, characterized in that: Multiple fixing rods (607) are fixedly connected to the outer surface of the annular gear ring (606). The ends of the multiple fixing rods (607) away from the annular gear ring (606) are fixedly connected to the outer surface of the protective housing (101). The drive gear (604) meshes with the annular gear ring (606). A sealing gasket (608) is fixedly connected to the side of the second housing (601) near the protective housing (101). The side of the sealing gasket (608) away from the second housing (601) is tightly fitted to the outer surface of the protective housing (101).

7. A Doppler current meter according to claim 1, characterized in that: A movable sleeve (609) is fitted at the end of the first rotating rod (603) away from the drive gear (604). A first rotating block (610) is fixedly connected to the end of the movable sleeve (609). A limiting gear (611) is fixedly connected to the outer surface of the movable sleeve (609). A limiting tooth groove (612) is opened on the outer surface of the second housing (601). The limiting gear (611) meshes with the limiting tooth groove (612). A fixing block (614) is fixedly connected to the inner surface of the movable sleeve (609). A guide groove (613) is opened on the outer surface of the first rotating rod (603). The fixing block (614) is slidably disposed inside the guide groove (613).

8. A Doppler current meter according to claim 1, characterized in that: The bottom of the third housing (801) is fixedly connected to the upper surface of the connecting seat (7). The inner wall of the third housing (801) of the connecting seat (7) is fixedly connected to the second guide rail (805) and the third guide rail (806). The second guide rail (805) and the third guide rail (806) are arranged opposite to each other. The outer surface of the second guide rail (805) is slidably connected to the second rack (807). The outer surface of the third guide rail (806) is slidably connected to the third rack (808). One end of the first U-shaped rod (809) is fixedly connected to the end of the second rack (807). One end of the second U-shaped rod (810) is fixedly connected to the end of the third rack (808).

9. A Doppler current meter according to claim 8, characterized in that: The third housing (801) is rotatably connected to a second rotating rod (802). The top end of the second rotating rod (802) penetrates the top of the third housing (801). The top end of the second rotating rod (802) is fixedly connected to a second rotating block (803). The outer surface of the second rotating rod (802) is fixedly connected to a second gear (804). The second rack (807) and the third rack (808) mesh with the second gear (804). The through holes on both sides of the third housing (801) are respectively provided with a second sealing ring (811) and a third sealing ring (812). The outer surface of the first U-shaped rod (809) penetrates the second sealing ring (811), and the outer surface of the second U-shaped rod (810) penetrates the third sealing ring (812).

10. A Doppler current meter according to claim 8, characterized in that: The outer surface of the first U-shaped rod (809) is fitted with a first spring (813). The two ends of the first spring (813) are fixedly connected to the inner wall of the third housing (801) and the end of the second rack (807), respectively. The outer surface of the second U-shaped rod (810) is fitted with a second spring (814). The two ends of the second spring (814) are fixedly connected to the inner wall of the third housing (801) and the end of the third rack (808), respectively. The outer surface of the upright rod (3) is provided with multiple scale lines (12). The outer surface of the upright rod (3) is provided with multiple limiting holes (11). The limiting holes (11) are symmetrically arranged on both sides of the upright rod (3). The interior of the limiting holes (11) is adapted to the outer surfaces of the first U-shaped rod (809) and the second U-shaped rod (810). The lower part of the outer surface of the upright rod (3) is fixedly connected with multiple legs (10).

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