Water velocity meter

Abstract

A water velocity meter disclosed by the present invention comprises a waterproof ventilation valve, a flange cylinder, a dry end unit and a wet end unit, the dry end unit is provided with a watertight cavity, the waterproof ventilation valve is installed on the dry end unit, the waterproof ventilation valve is communicated with the watertight cavity and an external environment, the flange cylinder is provided with a cylinder cavity, and the flange cylinder is installed on the dry end unit. The flange cylinder is installed at the bottom of the dry end unit, the cylinder cavity of the flange cylinder is communicated with the watertight cavity of the dry end unit, and the top of the wet end unit penetrates through the cylinder cavity of the flange cylinder and then stretches into the watertight cavity of the dry end unit. The wet end unit is connected to the dry end unit in a drivable mode, and the dry end unit drives the wet end unit to ascend and descend.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hydrological monitoring, in particular to a water speed meter, wherein the water speed meter is configured to measure hydrological characteristics such as water flow velocity, so that the water speed meter can be used as a sensor of a towed platform, for example, a speed sensor. BACKGROUND

[0002] In the fields of hydrological monitoring, water conservancy engineering, ecological environment assessment, and the like, water flow velocity as a core hydrological characteristic parameter is of great significance to accurately measure it. With the development of monitoring technology, measurement instruments based on the Doppler principle have become the mainstream technology due to their high measurement accuracy, ability to measure three-dimensional flow velocity, fast response speed, and the like. The measurement instruments of the prior art all adopt a fixed installation scheme, in which the measurement instrument is fixed below the towed platform to form a protruding part through bolting or welding and the like, so as to ensure that the transducer of the measurement instrument is stably submerged underwater during measurement, thereby avoiding measurement deviation caused by ship body shaking or water flow impact. However, with the diversification of hydrological monitoring scenarios, dual-purpose towed platforms are widely used in complex terrain water area monitoring. Unlike traditional ship bodies, dual-purpose towed platforms need to alternately switch between water environment and land environment for driving, which leads to a conflict between the measurement instruments of the prior art and the installation mode of the measurement instruments and the ship body and the driving mode of the dual-purpose towed platform. Specifically, when the dual-purpose towed platform is driven on land, the measurement instrument will directly contact the ground and be damaged, and the protruding installation structure will affect the driving stability and maneuverability of the dual-purpose towed platform. Therefore, developing a measurement instrument suitable for dual-purpose towed platforms is a technical problem that the present inventors are committed to solving. SUMMARY

[0003] One object of the present application is to provide a water speed meter, wherein the water speed meter can be switched between a retracted state and an extended state, so that the water speed meter can be equipped on a dual-purpose towed platform. Specifically, when the water-tight cavity of the dry end unit is retracted at the bottom of the wet end unit of the water speed meter, the water speed meter is in the retracted state, at which time the dual-purpose towed platform is suitable for driving in a land environment, and when the water-tight cavity of the dry end unit is extended at the bottom of the wet end unit, the water speed meter is in the extended state, at which time the dual-purpose towed platform is suitable for driving in a water environment and measuring hydrological characteristics.

[0004] An object of the present application is to provide a water speed meter, wherein the dry end unit is capable of driving the wet end unit to lift at a high speed, so that the water speed meter can quickly switch between the contracted state and the stretched state, in this way, the dual-purpose towing platform can move at a high speed between the water environment and the land environment, when the dual-purpose towing platform moves from the water environment to the land environment at a high speed, the water speed meter can avoid the bottom of the wet end unit from being collided, when the dual-purpose towing platform moves from the land environment to the water environment at a high speed, the wet end unit of the water speed meter can quickly descend to the measuring depth.

[0005] An object of the present application is to provide a water speed meter, wherein the water speed meter is provided with a waterproof air permeable valve installed on the dry end unit, which is used to balance the air pressure between the water-tight cavity of the dry end unit and the external environment, so as to avoid the water-tight cavity from forming a high-pressure environment or a negative pressure environment, thereby enabling the water speed meter to quickly switch between the contracted state and the stretched state.

[0006] According to an aspect of the present application, the present application provides a water speed meter, comprising: a waterproof air permeable valve; a dry end unit, wherein the dry end unit has a water-tight cavity, the waterproof air permeable valve is installed on the dry end unit, and the waterproof air permeable valve is in communication with the water-tight cavity and the external environment; a flange barrel, wherein the flange barrel has a barrel cavity, the flange barrel is installed on the bottom of the dry end unit, and the barrel cavity of the flange barrel is in communication with the water-tight cavity of the dry end unit; and a wet end unit, wherein the top of the wet end unit extends into the water-tight cavity of the dry end unit after passing through the barrel cavity of the flange barrel, and the wet end unit is drivingly connected to the dry end unit, so that the wet end unit is lifted and lowered by the dry end unit.

[0007] According to an embodiment of the present application, the dry end unit comprises a dry end barrel, a dry end end cover, a motor support, an assembly column, a driving part, and a lifting platform, the bottom of the dry end barrel is installed on the top of the flange barrel, the dry end end cover is installed on the top of the dry end barrel to form the water-tight cavity between the dry end barrel and the dry end end cover, the opposite ends of the assembly column are respectively installed on the flange barrel and the motor support, so that the motor support is held at the top of the water-tight cavity, the driving part comprises a driving motor assembly and a lead screw, the driving motor assembly is installed on the motor support, the top of the lead screw shaft of the lead screw is drivingly connected to the driving motor assembly, the nut of the lead screw is fixedly installed on the lifting platform, and the top of the wet end unit is installed on the lifting platform.

[0008] According to one embodiment of the present application, the driving part comprises a top bearing assembly, a bottom bearing assembly, a driving gear and a driven gear, the top bearing assembly is installed on the motor support, the bottom bearing assembly is installed on the top of the flange cylinder, the opposite ends of the screw rod are respectively installed on the top bearing assembly and the bottom bearing assembly, the driving gear is fixedly installed on the output shaft of the driving motor assembly, the driven gear is fixedly sleeved on the top of the screw rod, and the driven gear is engaged with the driving gear.

[0009] According to one embodiment of the present application, the dry end unit comprises an anti-collision part, the anti-collision part comprises a top anti-collision rod and a bottom anti-collision rod, the top end of the top anti-collision rod is installed below the motor support, the bottom end of the top anti-collision rod extends towards the lifting platform, the bottom end of the bottom anti-collision rod is installed on the top of the flange cylinder, and the top end of the bottom anti-collision rod extends towards the lifting platform.

[0010] According to one embodiment of the present application, the dry end unit comprises a position detection part, the position detection part comprises a top position detection assembly and a bottom position detection assembly, the top position detection assembly is installed below the motor support, and is used for detecting whether the lifting platform moves upwards to a preset position, and the bottom detection assembly is installed on the top of the flange cylinder, and is used for detecting whether the lifting platform moves downwards to a preset position.

[0011] According to one embodiment of the present application, the dry end cover has a first cover through hole, and the waterproof and breathable valve is installed in the first cover through hole of the dry end cover.

[0012] According to one embodiment of the present application, the waterproof and breathable valve comprises a valve body, a valve core, a first waterproof and breathable film, a second waterproof and breathable film and a valve cover, the valve body has a valve cavity and a valve hole extending downward from the valve cavity, the valve core has a core hole, the first waterproof and breathable film and the second waterproof and breathable film are respectively arranged on the opposite sides of the valve core, and are used for closing two openings of the core hole, the first waterproof and breathable film and the valve core are accommodated in the valve cavity of the valve body in a corresponding manner of the core hole of the valve core and the valve hole of the valve body, the edge of the first waterproof and breathable film is clamped between the valve body and the valve core, the valve cover is installed on the top of the valve body in a manner that an air passage is formed between the valve cover and the valve body, and the edge of the second waterproof and breathable film is clamped between the valve core and the valve cover.

[0013] According to one embodiment of the present application, the valve body has a top notch, the top notch is communicated with the air passage, there is a gap between the peripheral wall of the valve cover and the top of the valve body, the gap is communicated with the top notch, and the peripheral wall of the valve cover blocks the top notch of the valve body.

[0014] According to one embodiment of the present application, the dry-end unit comprises a circuit board, a dry-end plug, and a spiral cable, opposite ends of the spiral cable are connected to the circuit board and the dry-end plug respectively, the wet-end unit comprises an electronic cabin, a bottom adapter, a top adapter, and a wet-end host, the electronic cabin comprises a cabin body and a processing board assembly, the cabin body has a cabin cavity and a bottom opening and a top opening communicated with the cabin cavity respectively, the processing board assembly is accommodated in the cabin cavity of the cabin body, the bottom adapter is mounted on the bottom of the cabin body for closing the bottom opening of the cabin body, the processing board assembly and the bottom adapter are electrically connected, the top adapter is mounted on the top of the cabin body for closing the top opening of the cabin body, the processing board assembly and the top adapter are electrically connected, and the wet-end host is mounted on the bottom of the cabin body, the wet-end host and the bottom adapter are electrically connected, wherein the top adapter is mounted on the lifting platform, and the dry-end plug is inserted into the top adapter.

[0015] According to one embodiment of the present application, the water speed meter comprises a sealing unit, the sealing unit comprises two dustproof sealing rings and an oil sealing ring, the flange cylinder has a first ring groove, a second ring groove, and a third ring groove, the first ring groove, the second ring groove, and the third ring groove are distributed along the height direction of the flange cylinder, the outer side of one of the dustproof sealing rings is embedded in the first ring groove of the flange cylinder, and the inner side is bound to the top of the wet-end unit, the outer side of the other dustproof sealing ring is embedded in the third ring groove of the flange cylinder, and the inner side is bound to the top of the wet-end unit, and the outer side of the oil sealing ring is embedded in the second ring groove of the flange cylinder, and the inner side is bound to the top of the wet-end unit.

[0016] According to another aspect of the present application, the present application provides a water speed meter, comprising: a dry-end unit; a wet-end unit; a flange cylinder, wherein the flange cylinder has a cylinder cavity and a first ring groove, a second ring groove, and a third ring groove arranged on the inner wall of the flange cylinder, the flange cylinder is mounted on the bottom of the dry-end unit, the top of the wet-end unit passes through the cylinder cavity of the flange cylinder, and the top of the wet-end unit is drivingly connected to the dry-end unit; and The sealing unit comprises two dustproof sealing rings and an oil seal ring, one of the dustproof sealing rings is embedded in the first ring groove of the flange cylinder and is bound to the top of the wet end unit, the other dustproof sealing ring is embedded in the third ring groove of the flange cylinder and is bound to the top of the wet end unit, and the oil seal ring is embedded in the second ring groove of the flange cylinder and is bound to the top of the wet end unit.

[0017] According to an embodiment of the present application, the flange cylinder comprises two fourth ring grooves, one of the fourth ring grooves is located between the first ring groove and the second ring groove, and the other fourth ring groove is located between the third ring groove and the second ring groove, and the water velocity meter comprises two guide rings, each of the guide rings is sleeved on the top of the wet end unit and is embedded in each of the fourth ring grooves of the flange cylinder.

[0018] According to an embodiment of the present application, the dry end unit has a water-tight cavity, the cylinder cavity of the flange cylinder is communicated with the water-tight cavity of the dry end unit, and the top of the wet end unit extends into the water-tight cavity of the dry end unit.

[0019] According to an embodiment of the present application, the water velocity meter comprises a waterproof breather valve, the waterproof breather valve is installed on the dry end unit, and the waterproof breather valve is communicated with the water-tight cavity and the external environment, and is used for balancing the air pressure of the water-tight cavity and the external environment. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a perspective view of a water velocity meter according to a preferred embodiment of the present application in an extended state.

[0021] Figure 2 is a perspective view of the water velocity meter according to the above preferred embodiment of the present application in a contracted state.

[0022] Figure 3 is a sectional view of a position of the water velocity meter according to the above preferred embodiment of the present application.

[0023] Figure 4 is Figure 3 is an enlarged view of position A of

[0024] Figure 5 is Figure 3 is an enlarged view of position B of

[0025] Figure 6 is a perspective view of a dry end unit of the water velocity meter according to the above preferred embodiment of the present application.

[0026] Figure 7 This is an exploded view of the dry-end unit of the water velocity meter according to the above-described preferred embodiment of the present invention.

[0027] Figure 8 This is an exploded view of the dry-end unit of the water velocity meter according to the above-described preferred embodiment of the present invention.

[0028] Figure 9 This is a perspective view of a waterproof and breathable valve of the water velocity meter according to the above-described preferred embodiment of the present invention.

[0029] Figure 10 This is a perspective view of the waterproof and breathable valve of the water velocity meter according to the above-described preferred embodiment of the present invention.

[0030] Figure 11 This is an exploded view of the waterproof and breathable valve of the water velocity meter according to the above-described preferred embodiment of the present invention.

[0031] Figure 12 This is an exploded view of the waterproof and breathable valve of the water velocity meter according to the above-described preferred embodiment of the present invention.

[0032] Figure 13 This is a cross-sectional schematic diagram of the waterproof and breathable valve of the water velocity meter according to the above-described preferred embodiment of the present invention.

[0033] Figure 14 This is a perspective view of a wet end unit of the water velocity meter according to the above-described preferred embodiment of the present invention.

[0034] Figure 15 This is an exploded view of the wet end unit of the water velocity meter according to the above-described preferred embodiment of the present invention.

[0035] Figure 16 This is an exploded view of the wet end unit of the water velocity meter according to the above-described preferred embodiment of the present invention.

[0036] Figure 17 This is an exploded view of the bottom adapter of the wet end unit of the water velocity meter according to the above-described preferred embodiment of the present invention when it is not glued.

[0037] Figure 18 This is an exploded view of the bottom adapter of the wet end unit of the water velocity meter according to the above-described preferred embodiment of the present invention when it is not glued.

[0038] Figure 19 This is a perspective view of a wet-end main unit of the water velocity meter according to the above-described preferred embodiment of the present invention.

[0039] Figure 20 This is a cross-sectional schematic diagram of one location of the wet end host of the wet end unit of the water velocity meter according to the above-described preferred embodiment of the present invention.

[0040] Figure 21 This is a cross-sectional schematic diagram of another location of the wet end host of the wet end unit of the water velocity meter according to the above-described preferred embodiment of the present invention.

[0041] Figure 22 This is a perspective view of a partial location of the water velocity meter according to the above-described preferred embodiment of the present invention.

[0042] Figure 23 This is a cross-sectional schematic diagram of a partial location of the water velocity meter according to the above-described preferred embodiment of the present invention.

[0043] Figure 24 This is a schematic diagram of one of the assembly processes of the water velocity meter according to the above-described preferred embodiment of the present invention.

[0044] Figure 25 This is a schematic diagram of the second assembly process of the water velocity meter according to the above-described preferred embodiment of the present invention.

[0045] Figure 26 This is a schematic diagram of the third assembly process of the water velocity meter according to the above-described preferred embodiment of the present invention.

[0046] Figure 27 This is a schematic diagram of the fourth assembly process of the water velocity meter according to the above-described preferred embodiment of the present invention.

[0047] Figure 28 This is a schematic diagram of the fifth assembly process of the water velocity meter according to the above-described preferred embodiment of the present invention.

[0048] Figure 29 This is a schematic diagram of the sixth assembly process of the water velocity meter according to the above-described preferred embodiment of the present invention.

[0049] Figure 30 This is a schematic diagram of the seventh assembly process of the water velocity meter according to the above-described preferred embodiment of the present invention.

[0050] Figure 31 This is a schematic diagram of the assembly process of the water velocity meter according to the above-described preferred embodiment of the present invention, step eight.

[0051] In the picture: Dry end unit 10; watertight cavity 101; dry end cylinder 11; dry end cover 12; first end cover perforation 121; second end cover perforation 122; third end cover perforation 123; fourth end cover perforation 124; motor bracket 13; first frame perforation 131; second frame perforation 132; assembly column 14; drive unit 15; drive motor assembly 151; motor 1511; output shaft 1512; lead screw 152; lead screw shaft 1521; nut 1522; top bearing assembly 153; bottom bearing assembly 154; drive gear 155; driven gear 156; lifting platform 16; first clearance groove 161; first shaft hole 162; metal plate 163; center perforation 1 64; Circuit board 17; Board support 18; Gear housing 19; Housing cavity 191; Second shaft hole 192; Third clearance groove 193; Anti-collision part 110; Top anti-collision bar 1101; First buffer head 11011; Bottom anti-collision bar 1102; Second buffer head 11021; Position detection part 111; Top position detection assembly 1111; First assembly bracket 11111; First proximity switch 11112; Bottom position detection assembly 1112; Second assembly bracket 11121; Second proximity switch 11122; Watertight terminal 112; End cover circuit board 113; Dry end connector 114; Spiral cable 115; Indicator light 116; Button 117; Waterproof and breathable valve 20; valve body 21; valve cavity 211; valve hole 212; valve body 213; threaded post 214; convex ring 215; bottom ring 2151; top ring 2152; bearing step 2153; top notch 216; valve core 22; core hole 221; bottom core 222; top core 223; overlapping shoulder 224; core groove 225; first waterproof and breathable membrane 23; second waterproof and breathable membrane 24; valve cover 25; cover body 251; pressure block 252; peripheral wall 253; air passage 26; Flange cylinder 30; cylinder cavity 301; second clearance groove 302; first annular groove 31; second annular groove 32; third annular groove 33; fourth annular groove 34; Wet end unit 40; Electronic compartment 41; Compartment 411; Compartment 4111; Main cavity 41111; Insertion cavity 41112; Bottom opening 4112; Top opening 4113; Main compartment 4114; Restraint compartment 4115; Processing plate assembly 412; First female connector 4121; Third female connector 4122; Bottom adapter 42; Bottom adapter cylinder 421; First cylinder body 4211; First receiving cavity 42111; First contact ring 4212; Bottom adapter plate assembly 422; First male connector 4221; Second male connector 4222; Glue filling section 423; Top adapter Connector 43; Top adapter cylinder 431; Second cylinder body 4311; Second receiving cavity 43111; Second lap ring 4312; Top adapter plate assembly 432; Third male plug 4321; Wet end connector 4322; Wet end main unit 44; Insertion slot 441; Second female plug 442; Housing 443; Housing groove 4431; Assembly groove 4432; Opening 4433; Electrode hole 4434; Main unit circuit board 444; Plate perforation 4441; Transducer 445; Adhesive part 446; Electrode 447; Electrode groove 4471; Thermistor 448; Assembly ring 45; Sealing unit 50; Dustproof sealing ring 51; Oil seal ring 52; Guide ring 60; ring body notch 61; Screw 100; 200mm sealing ring; Nut 300. Detailed Implementation

[0052] Before detailing any embodiment of the invention, it should be understood that the invention, in its application, is not limited to the details of the construction and arrangement of the components set forth in the following description or illustrated in the following figures. The invention can have other embodiments and can be practiced or carried out in various ways. Furthermore, it should be understood that the wording and terminology used herein are for descriptive purposes and should not be considered limiting. The use of “comprising” or “having” and variations thereof is intended to cover the items set forth below and their equivalents, as well as any additional items. Unless otherwise specified or limited, the terms “installation,” “connection,” “support,” and “linkage,” and variations thereof are used broadly and cover both direct and indirect installation, connection, support, and linking. Moreover, “connection” and “linkage” are not limited to physical or mechanical connections or links.

[0053] Furthermore, firstly, in the disclosure of this invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limiting the invention. Secondly, the term "a" should be understood as "at least one" or "one or more," that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple. The term "a" should not be construed as a limitation on the quantity.

[0054] Please refer to the accompanying drawings of the specification of this application. Figures 1 to 23 A preferred embodiment of the present invention will be disclosed and described in the following description, wherein the water velocity meter includes a dry end unit 10, a waterproof and breathable valve 20, a flange cylinder 30, and a wet end unit 40.

[0055] Reference Appendix Figure 3 , Figure 7 and Figure 8 The dry-end unit 10 has a watertight cavity 101. A waterproof and breathable valve 20 is installed in the dry-end unit 10 and connects the watertight cavity 101 to the external environment to balance the air pressure between the watertight cavity 101 and the external environment. (See attached diagram.) Figure 3 and Figure 23 The flange cylinder 30 has a cylindrical cavity 301. The flange cylinder 30 is installed at the bottom of the dry end unit 10. The cylindrical cavity 301 of the flange cylinder 30 is connected to the watertight cavity 101 of the dry end unit 10. The flange cylinder 30 is used to install the water velocity meter on the dual-purpose towing platform. The top of the wet end unit 40 extends into the watertight cavity 101 of the dry end unit 10 after passing through the cylindrical cavity 301 of the flange cylinder 30. The wet end unit 40 is drivably connected to the dry end unit 10 and is driven to rise and fall by the dry end unit 10.

[0056] The water velocity meter of the present invention has a retracted state and an extended state, and the water velocity meter can switch between the retracted state and the extended state. During the process of the dry-end unit 10 driving the wet-end unit 40 to retract the watertight cavity 101 of the dry-end unit 10, the waterproof vent valve 20 allows air inside the watertight cavity 101 of the dry-end unit 10 to be discharged to the external environment, thereby preventing the formation of a high-pressure environment inside the watertight cavity 101 of the dry-end unit 10. This ensures the reliability of the electronic components of the dry-end unit 10 and reduces the driving force requirements on the dry-end unit 10. After the dry-end unit 10 drives the wet-end unit 10 to retract the watertight cavity 101 of the dry-end unit 10, the water velocity meter is in the retracted state. At this time, the dual-purpose towing platform is suitable for driving in a land environment. During the process of the dry end unit 10 driving the wet end unit 40 to extend the watertight cavity 101 of the dry end unit 10, the waterproof and breathable valve 20 allows air from the external environment to enter the watertight cavity 101 of the dry end unit 10 to avoid the formation of a negative pressure environment in the watertight cavity 101 of the dry end unit 10. This ensures the reliability of the electronic components of the dry end unit 10 and reduces the driving force requirements of the dry end unit 10. After the dry end unit 10 drives the wet end unit 40 to extend the watertight cavity 101 of the dry end unit 10, the water velocity meter is in the extended state. At this time, the dual-purpose towing platform is suitable for driving in a water environment and measuring hydrological characteristics.

[0057] In other words, by driving the wet end unit 40 to rise and fall relative to the dry end unit 10, the water velocity meter can switch between the retracted state and the extended state. It is understood that the dry end unit 10 is the part of the water velocity meter installed inside the dual-purpose towing platform, and it does not directly enter the water. The wet end unit 40 is the water-entry part of the water velocity meter, and it enters the water when the water velocity meter is in the extended state. The flange cylinder 30 has a relatively high height dimension, so that when the dry end unit 10 drives the wet end unit 40 to rise and fall, the flange cylinder 30 can prevent the wet end unit 40 from tilting.

[0058] Specifically, see the attached document. Figures 1 to 3 , Figures 6 to 8 , Figure 22 and Figure 23 The dry end unit 10 includes a dry end cylinder 11, a dry end cap 12, a motor bracket 13, at least one mounting column 14, at least one drive unit 15, and a lifting platform 16.

[0059] The bottom of the dry-end cylinder 11 is mounted on the top of the flange cylinder 30, so that the flange cylinder 30 is mounted on the bottom of the dry-end unit 10. In this specific example of the water velocity meter of the present invention, refer to the appendix.Figures 1 to 4 The outer diameter of the top of the flange cylinder 30 is the same as the inner diameter of the bottom of the dry end cylinder 11. After the top of the flange cylinder 30 extends into the interior of the dry end cylinder 11, a set of screws 100 are used to lock the top of the flange cylinder 30 to the bottom of the dry end cylinder 11, thereby ensuring that the bottom of the dry end cylinder 11 is reliably installed on the top of the flange cylinder 30 and preventing the dry end cylinder 11 and the flange cylinder 30 from shaking. Preferably, at least one sealing ring 200 is provided between the bottom of the dry end cylinder 11 and the top of the flange cylinder 30 to increase the water tightness of the joint between the bottom of the dry end cylinder 11 and the top of the flange cylinder 30.

[0060] The dry end cap 12 is mounted on the top of the dry end cylinder 11 to form the watertight cavity 101 between the dry end cylinder 11 and the dry end cap 12. In this specific example of the water velocity meter of the present invention, refer to the appendix. Figures 1 to 3 The outer diameter of the bottom of the dry end cap 12 is the same as the inner diameter of the top of the dry end cylinder 11. After the bottom of the dry end cap 12 extends into the interior of the dry end cylinder 11, a set of screws 100 are used to lock the dry end cap 12 onto the top of the dry end cylinder 11, thereby reliably installing the dry end cap 12 onto the top of the dry end cylinder 11 and preventing the dry end cylinder 11 and the dry end cap 12 from shaking. Preferably, at least one sealing ring 200 is provided between the top of the dry end cylinder 11 and the dry end cap 12 to increase the water tightness of the joint between the dry end cylinder 11 and the dry end cap 12.

[0061] The opposite ends of the mounting column 14 are respectively mounted to the flange cylinder 30 and the motor bracket 13, for holding the motor bracket 13 on top of the watertight cavity 101 of the dry end unit 10. In this specific example of the water velocity meter of the present invention, refer to the appendix. Figure 3 , Figure 7 , Figure 8 , Figure 22 and Figure 23 One of the screws 100 is used to lock the bottom of the mounting post 14 to the top of the flange cylinder 30, and the other screw 100 is used to lock the top of the mounting post 14 to the motor bracket 13, so that the mounting post 14 can hold the motor bracket 13 on top of the watertight cavity 101 of the dry end unit 10.

[0062] It is worth mentioning that the number of the assembly columns 14 is not limited in the water velocity meter of the present invention, for example, in the attached... Figures 1 to 23In this specific example of the water velocity meter of the present invention shown, the number of the mounting columns 14 is three, the three mounting columns 14 are arranged at equal intervals, and the three mounting columns 14 cooperate with each other to stably hold the motor bracket 13 on top of the watertight cavity 101 of the dry end unit 10.

[0063] Continue to refer to the appendix Figure 3 , Figure 7 , Figure 8 , Figure 22 and Figure 23 The drive unit 15 includes a drive motor assembly 151 and a lead screw 152. The drive motor assembly 151 is mounted on the motor bracket 13. The lead screw 152 includes a lead screw shaft 1521 and a nut 1522 screwed onto the lead screw shaft 1521. The top of the lead screw shaft 1521 is drivably connected to the drive motor assembly 151. The nut 1522 is fixedly mounted on the lifting platform 16. For example, a set of screws 100 can be used to fix the nut 1522 onto the lifting platform 16. The top of the wet end unit 40 is mounted on the lifting platform 16. For example, a set of screws 100 can be used to mount the top of the wet end unit 40 onto the lifting platform 16. When the drive motor assembly 151 drives the lead screw shaft 1521 of the lead screw 152 to rotate in one direction, the lead screw shaft 1521 and the nut 1522 cooperate to drive the lifting platform 16 to move upward. The lifting platform 16 drives the wet end unit 40 to move upward synchronously, so that the water velocity meter switches from the extended state to the retracted state. When the drive motor assembly 151 drives the lead screw shaft 1521 of the lead screw 152 to rotate in the opposite direction, the lead screw shaft 1521 and the nut 1522 cooperate to drive the lifting platform 16 to move downward. The lifting platform 16 drives the wet end unit 40 to move downward synchronously, so that the water velocity meter switches from the retracted state to the extended state.

[0064] Preferably, refer to the appendix Figure 3 The lifting platform 16 has at least one first clearance groove 161 for avoiding contact between the assembly column 14 and the lifting platform 16. (See attached...) Figures 1 to 23 In this specific example of the water velocity meter of the present invention shown, the number of the first clearance slots 161 of the lifting platform 16 is three, and each of the first clearance slots 161 clears each of the assembly columns 14.

[0065] Preferably, refer to the appendix Figure 8 The lifting platform 16 has at least one first shaft hole 162 for allowing the bottom of the lead screw shaft 1521 of the lead screw 152 to pass through. (See attached...)Figures 1 to 23 In this specific example of the water velocity meter of the present invention shown, the number of the first shaft holes 162 of the lifting platform 16 is three, and the bottom of the lead screw shaft 1521 of each lead screw 152 passes through the respective first shaft holes 162 of the lifting platform 16.

[0066] In the appendix Figures 1 to 23 In this specific example of the water velocity meter of the present invention, the number of drive units 15 is three, so that the drive units 15 can quickly drive the lifting platform 16 to rise and fall, thereby enabling the water velocity meter to quickly switch between the retracted state and the extended state. In this way, the dual-purpose towing platform can move at high speed in both aquatic and land environments. When the dual-purpose towing platform moves at high speed from the aquatic environment to the land environment, the bottom of the wet end unit 40 of the water velocity meter can be prevented from being collided. When the dual-purpose towing platform moves at high speed from the land environment to the aquatic environment, the wet end unit 40 of the water velocity meter can quickly descend to the measurement depth. In addition, it should be noted that the water velocity meter of the present invention has a relatively long size. For example, the height of both the dry end unit 10 and the wet end unit 40 can be about 50 cm. Therefore, the wet end unit 40 has a large weight. By setting the number of drive units 15 to three, the three drive units 15 can provide a large driving force after cooperating with each other to drive the heavy wet end unit 40 to rise and fall quickly.

[0067] Reference Appendix Figure 3 , Figure 7 , Figure 8 , Figure 22 and Figure 23 Each of the three drive motor assemblies 151 includes a motor 1511 and an output shaft 1512 drivably mounted on the motor 1511. The drive motor assembly 151 outputs power by rotating the output shaft 1512. The motor bracket 13 has three first frame through holes 131. A set of screws 100 is used to lock the motor 1511 onto the upper part of the motor bracket 13. The output shaft 1512 extends through the first frame through holes 131 of the motor bracket 13 to the lower part of the motor bracket 13. The top of the lead screw shaft 1521 of the lead screw 152 is drivably connected to the bottom of the output shaft 1512 of the drive motor assembly 151.

[0068] For details, please refer to the appendix. Figure 3 , Figure 7 , Figure 8 , Figure 22 and Figure 23The drive unit 15 includes a top bearing assembly 153, a bottom bearing assembly 154, a drive gear 155, and a driven gear 156. The top bearing assembly 153 is mounted on the motor bracket 13. For example, a set of screws 100 can be used to mount the top bearing assembly 153 to the motor bracket 13. The bottom bearing assembly 154 is mounted on the top of the flange cylinder 30. For example, a set of screws 100 can be used to mount the bottom bearing assembly 154 to the top of the flange cylinder 30. The top of the lead screw shaft 1521 of the lead screw 152 is mounted on the top bearing assembly 153, and the bottom of the lead screw shaft 1521 is mounted on the bottom bearing assembly 156. The bearing assembly 154 allows the lead screw shaft 1521 to rotate around its central axis. The driving gear 155 is fixedly mounted on the bottom of the output shaft 1512 of the drive motor assembly 151, and the output shaft 1512 drives the driving gear 155 to rotate synchronously. The driven gear 156 is fixedly mounted on the top of the lead screw shaft 1521, so that the lead screw shaft 1521 and the driven gear 156 rotate synchronously. The driven gear 156 is engaged with the driving gear 155. In this way, the top of the lead screw shaft 1521 of the lead screw 152 is drivably connected to the bottom of the output shaft 1512 of the drive motor assembly 151. When the motor 1511 drives the output shaft 1512 and the drive gear 155 to rotate in one direction, the drive gear 155 and the driven gear 156 cooperate to drive the lead screw shaft 1521 of the lead screw 152 to rotate in one direction. The lead screw shaft 1521 and the nut 1522 cooperate to drive the lifting platform 16 to move upward. When the motor 1511 drives the output shaft 1512 and the drive gear 155 to rotate in opposite directions, the drive gear 155 and the driven gear 156 cooperate to drive the lead screw shaft 1521 of the lead screw 152 to rotate in opposite directions. The lead screw shaft 1521 and the nut 1522 cooperate to drive the lifting platform 16 to move downward.

[0069] Preferably, refer to the appendix. Figure 23 The motor bracket 13 has three second frame through holes 132. The main body of the top bearing assembly 153 is mounted on top of the motor bracket 13. A portion of the top bearing assembly 153 is inserted into the second frame through holes 132 of the motor bracket 13 to reliably mount the top bearing assembly 153 to the motor bracket 13.

[0070] Preferably, refer to the appendix Figure 4The flange cylinder 30 has at least one second clearance groove 302 at its top to avoid contact between the bottom of the lead screw shaft 1521 of the lead screw 152 and the flange cylinder 30. (See attached...) Figures 1 to 23 In this specific example of the water velocity meter of the present invention shown, the flange cylinder 30 has three second clearance grooves 302, and the position of the bottom of the lead screw shaft 1521 of each lead screw 152 corresponds one-to-one with the position of each second clearance groove 302 of the flange cylinder 30.

[0071] Reference Appendix Figure 3 , Figure 7 , Figure 8 , Figure 12 and Figure 23 The dry-end unit 10 includes a circuit board 17 and at least one plate support 18. The bottom of the plate support 18 is mounted to the motor bracket 13. For example, a screw 100 can be used to mount the bottom of the plate support 18 to the motor bracket 13. The top of the plate support 18 is mounted to the circuit board 17. For example, a screw 100 can be used to mount the top of the plate support 18 to the circuit board 17. In this way, the plate support 18 can suspend the circuit board 17 above the motors 1511 of the drive motor assembly 151, making the structure of the dry-end unit 10 more compact. The motors 1511 of each drive motor assembly 151 are controllably connected to the circuit board 17. The circuit board 17 can synchronously send drive signals to the motors 1511 of these drive motor assemblies 151 to drive the lifting platform 16 to rise and fall at high speed and smoothly.

[0072] In the appendix Figures 1 to 23 In this specific example of the water velocity meter of the present invention shown, the number of plate supports 18 is three, the three plate supports 18 are arranged at equal intervals, and the three plate supports 18 cooperate with each other to stably hold the plate supports 18 above the motors 1511 of these drive motor assemblies 151.

[0073] Further, see attached document. Figure 3 , Figure 7 , Figure 8 , Figure 12 and Figure 23The dry-end unit 10 includes a gear housing 19, which has a cavity 191 and at least one second shaft hole 192 communicating with the cavity 191. The gear housing 19 is mounted on the motor bracket 13, and the motor bracket 13 closes the opening of the cavity 191 of the gear housing 19. The lead screw shaft 1521 of the lead screw 152 passes through the second shaft hole 192 of the gear housing 19. The driving gear 155 and the driven gear 156 are located in the cavity 191 of the gear housing 19. The cavity 191 of the gear housing 19 can be filled with lubricating grease. When the drive unit 15 drives the lifting platform 16 to rise and fall, the gear housing 19 is used to prevent the lubricating grease from being thrown away from the driving gear 155 and the driven gear 156. Preferably, the gear housing 19 has a third clearance groove 193 for avoiding the top of the lead screw shaft 1521 of the lead screw 152.

[0074] In the appendix Figures 1 to 23 In this specific example of the water velocity meter of the present invention, the outer diameter of the motor bracket 13 and the inner diameter of the gear housing 19 at its cavity opening are the same. After the motor bracket 13 is lowered to the cavity opening of the gear housing 19, a set of screws 100 are used to lock the gear housing 19 and the motor bracket 13, thereby installing the gear housing 19 onto the motor bracket 13. Preferably, at least one sealing ring 200 is provided between the motor bracket 13 and the gear housing 19 to increase the watertightness of the joint between the motor bracket 13 and the gear housing 19. Preferably, the outer diameter of the gear housing 19 at its cavity opening and the inner diameter of the dry end cylinder 11 are the same, so that the outer wall of the gear housing 19 can fit against the inner wall of the dry end cylinder 11, preventing the gear housing 19 from shaking within the watertight cavity 101 of the dry end unit 10.

[0075] Further, see attached document. Figure 3 , Figures 6 to 8 The dry end cap 12 of the dry end unit 10 has a first end cap through hole 121, and the waterproof and breathable valve 20 is installed in the first end cap through hole 121 of the dry end cap 12 to install the waterproof and breathable valve 20 in the dry end unit 10.

[0076] Appendix Figure 3 , Figures 9 to 13The specific structure of the waterproof and breathable valve 20 of the water velocity meter of the present invention is shown. The waterproof and breathable valve 20 includes a valve body 21, a valve core 22, a first waterproof and breathable membrane 23, a second waterproof and breathable membrane 24, and a valve cover 25. The valve body 21 has a valve cavity 211 and a valve hole 212 extending downward from the valve cavity 211. The valve core 22 has a core hole 221. The first waterproof and breathable membrane 23 and the second waterproof and breathable membrane 24 are respectively disposed on opposite sides of the valve core 22 to close the core hole 221 of the valve core 22. The valve body 21 has two openings. The first waterproof and breathable membrane 23 and the valve core 22 are housed in the valve cavity 211 of the valve body 21, with the core hole 221 of the valve core 22 corresponding to the valve hole 212 of the valve body 21. The edge of the first waterproof and breathable membrane 23 is clamped between the valve body 21 and the valve core 22. The valve cover 25 is installed on the top of the valve body 21 in such a way that an air passage 26 is formed between the valve cover 25 and the valve body 21. The edge of the second waterproof and breathable membrane 24 is clamped between the valve core 22 and the valve cover 25. The valve body 21 is installed in the first end cover through hole 121 of the dry end cover 12, and the valve hole 212 of the valve body 21 is connected to the watertight cavity 101 of the dry end unit 10.

[0077] When the drive motor assembly 151 drives the lead screw shaft 1521 of the lead screw 152 to rotate in one direction, the lead screw shaft 1521 and the nut 1522 cooperate to drive the lifting platform 16 to move upward. The lifting platform 16 drives the wet end unit 40 to move upward synchronously, causing the water velocity meter to switch from the extended state to the retracted state. During this process, the air in the watertight cavity 101 of the dry end unit 10 is discharged to the external environment through the valve hole 212 of the valve body 21, the core hole 221 of the valve core 22, and the air passage 26. When the drive motor assembly 151 drives the lead screw shaft 1521 of the lead screw 152 to rotate in the opposite direction, the lead screw shaft 1521 and the nut 1522 cooperate to drive the lifting platform 16 to move downward. The lifting platform 16 drives the wet end unit 40 to move downward synchronously, so that the water velocity meter switches from the contracted state to the extended state. During this process, the air from the external environment enters the watertight cavity 101 of the dry end unit 10 through the air passage 26, the core hole 221 of the valve core 22 and the valve hole 212 of the valve body 21 in sequence. It is understood that when the water velocity meter switches from the extended state to the contracted state, the first waterproof and breathable membrane 23 and the second waterproof and breathable membrane 24 allow the gas in the watertight cavity 101 of the dry end unit 10 to pass through and be discharged to the external environment. When the water velocity meter switches from the contracted state to the extended state, the first waterproof and breathable membrane 23 and the second waterproof and breathable membrane 24 allow the gas in the external environment to pass through and enter the watertight cavity 101 of the dry end unit 10, while preventing moisture in the gas from entering the watertight cavity 101 of the dry end unit 10.

[0078] Specifically, the valve body 21 includes a valve body 213, a threaded post 214, and a convex ring 215. The threaded post 214 extends integrally downward from the bottom of the valve body 213, and the convex ring 215 extends integrally upward from the top of the valve body 213. The valve cavity 211 of the valve body 21 is formed in the convex ring 215, and the valve hole 212 is formed in the valve body 213 and the threaded post 214. The convex ring 215 of the valve body 21 has a bottom ring 2151 and a top ring 2152. The inner diameter of the bottom ring 2151 is smaller than the inner diameter of the top ring 2152. The convex ring 215 forms a support step 2153 at the connection between the bottom ring 2151 and the top ring 2152. The valve core 22 has a bottom core 222 and a top core 223. The outer diameter of the bottom core 222 is smaller than that of the top core 223, so that the valve core 22 forms a shoulder 224 at the connection between the bottom core 222 and the top core 223. The top core 223 forms a core groove 225 of the valve core 22, which communicates with the core hole 221. The inner diameter of the bottom core 222 is smaller than that of the top core 223. The valve cover 25 includes a cover body 251, a pressing block 252 extending downward from the center of the cover body 251, and a peripheral wall 253 extending downward from the periphery of the cover body 251, the peripheral wall 253 surrounding the pressing block 252. After the first waterproof and breathable membrane 23 is housed in the valve cavity 211 of the valve body 21 and the first waterproof and breathable membrane 23 closes the valve hole 212 of the valve body 21, the valve core 22 is housed in the valve cavity 211 of the valve body 21. At this time, the abutment shoulder 224 of the valve core 22 abuts against the abutment step 2153 of the protruding ring 215 of the valve body 21, and the bottom core 222 applies pressure to the edge of the first waterproof and breathable membrane 23, so that the first waterproof and breathable membrane 23 is reliably held in a position that closes the valve hole 212 of the valve body 21 and the bottom opening of the core hole 221 of the valve core 22. After the second waterproof and breathable membrane 24 is received in the core groove 225 of the valve core 22 and the second waterproof and breathable membrane 24 closes the top opening of the core hole 221 of the valve core 22, the valve cover 25 is installed on the valve body 21, and the pressure block 252 of the valve cover 25 applies pressure to the edge of the second waterproof and breathable membrane 24, so that the second waterproof and breathable membrane 24 is reliably held in the position of closing the top opening of the core hole 221 of the valve core 22. After the valve cover 25 is installed on the valve body 21, there is a gap between the top core 223 of the valve core 22 and the valve cover 25 for forming the air passage 26.It is understood that after flowing through the air passage 26, the gas from the external environment can pass through the edge of the second waterproof and breathable membrane 24 and enter the core hole 221 of the valve core 22, then pass through the middle of the first waterproof and breathable membrane 23 and enter the valve hole 212 of the valve body 21, and finally enter the watertight cavity 101 of the dry end unit 10.

[0079] Preferably, the valve body 21 has a top notch 216 formed on the convex ring 215 and communicating with the air passage 26. A gap exists between the peripheral wall 253 of the valve cover 25 and the top of the valve body 21, and this gap communicates with the top notch 216. In the water velocity meter of the present invention, the peripheral wall 253 of the valve cover 25 covers the top notch 216 of the valve body 21. In this way, when the dual-purpose towing platform carries the water velocity meter and operates for extended periods in a high-salt environment (e.g., at sea), the valve cover 25 can prevent the top notch 216 of the valve body 21 from becoming blocked.

[0080] Reference Appendix Figure 3 The outer diameter of the valve body 213 of the valve body 21 is larger than the inner diameter of the first end cap through hole 121 of the dry end cap 12, and the inner diameter of the threaded post 214 is slightly smaller than the inner diameter of the first end cap through hole 121 of the dry end cap 12. After the bottom of the threaded post 214 of the valve body 21 passes through the first end cap through hole 121 of the dry end cap 12, a nut 300 is screwed onto the bottom of the threaded post 214 of the valve body 21, thus reliably installing the waterproof and breathable valve 20 onto the dry end cap 12. Preferably, a sealing ring 200 is provided between the valve body 213 of the valve body 21 and the dry end cap 12 to increase the watertightness of the joint between the valve body 21 and the dry end cap 12.

[0081] Continue to refer to the appendix Figure 7 , Figure 8 , Figure 22 and Figure 23The dry-end unit 10 further includes a collision protection part 110, which includes at least one top collision protection bar 1101 and at least one bottom collision protection bar 1102. The top end of the top collision protection bar 1101 is installed below the motor bracket 13, and the bottom end of the top collision protection bar 1101 extends toward the lifting platform 16. The bottom end of the bottom collision protection bar 1102 is installed on the top of the flange cylinder 30, and the top end of the bottom collision protection bar 1102 extends toward the lifting platform 16. When the drive unit 15 drives the lifting platform 16 to move upward, if the drive motor assembly 151 of the drive unit 15 malfunctions, the top anti-collision bar 1101 can abut against the lifting platform 16 to limit the maximum upward movement of the lifting platform 16, thereby preventing the nut 1522 of the lead screw 152 from hitting the gear housing 19. When the drive unit 15 drives the lifting platform 16 to move downward, if the drive motor assembly 151 of the drive unit 15 malfunctions, the bottom anti-collision bar 1102 can abut against the lifting platform 16 to limit the maximum downward movement of the lifting platform 16, thereby preventing the lifting platform 16 from hitting the bottom bearing assembly 154.

[0082] Preferably, the bottom of the top anti-collision bar 1101 is provided with a deformable first buffer head 11011, which can be made of rubber or silicone, for absorbing the vibration generated by the impact. That is, the first buffer head 11011 is the part of the top anti-collision bar 1101 that contacts the lifting platform 16. The top of the bottom anti-collision bar 1102 is provided with a deformable second buffer head 11021, which can be made of rubber or silicone, for absorbing the vibration generated by the impact. That is, the second buffer head 11021 is the part of the bottom anti-collision bar 1102 that contacts the lifting platform 16.

[0083] In the appendix Figures 1 to 23 In this specific example of the water velocity meter of the present invention shown, the anti-collision part 110 includes three top anti-collision bars 1101 and three bottom anti-collision bars 1102. The three top anti-collision bars 1101 are arranged at equal intervals and cooperate with each other to prevent the lifting platform 16 from tilting due to uneven force. The three bottom anti-collision bars 1102 are arranged at equal intervals and cooperate with each other to prevent the lifting platform 16 from tilting due to uneven force.

[0084] Continue to refer to the appendix Figure 7 and Figure 22The dry-end unit 10 further includes a position detection unit 111, which includes a top position detection component 1111 and a bottom position detection component 1112. The top position detection component 1111 is installed below the motor bracket 13 and is used to detect whether the lifting platform 16 has moved upward to a preset position. The bottom position detection component 1112 is installed on the top of the flange cylinder 30 and is used to detect whether the lifting platform 16 has moved downward to a preset position.

[0085] Specifically, the top position detection component 1111 includes a first component bracket 11111 and a first proximity switch 11112. The top of the first component bracket 11111 is mounted on the motor bracket 13, and the first proximity switch 11112 is mounted on the bottom of the first component bracket 11111 and connected to the circuit board 17. The bottom position detection component 1112 includes a second component bracket 11121 and a second proximity switch 11122. The bottom of the second component bracket 11121 is mounted on the top of the flange cylinder 30, and the second proximity switch 11122 is mounted on the top of the second component bracket 11121 and connected to the circuit board 17. The lifting platform 16 is provided with... A metal plate 163 is provided. When the lifting platform 16 is driven to move upward and the metal plate 163 approaches the first proximity switch 11112, the first proximity switch 11112 can output a low-level signal. When the circuit board 17 receives the low-level signal sent by the first proximity switch 11112, it confirms that the lifting platform 16 has moved upward to a preset position. Correspondingly, when the lifting platform 16 is driven to move downward and the metal plate 163 approaches the second proximity switch 11122, the second proximity switch 11122 can output a low-level signal. When the circuit board 17 receives the low-level signal sent by the second proximity switch 11122, it can confirm that the lifting platform 16 has moved downward to a preset position.

[0086] Further, see attached document. Figure 3 , Figures 6 to 8The dry-end unit 10 includes at least one watertight terminal 112 and an end cap circuit board 113. The dry-end end cap 12 has at least one second end cap through hole 122. The watertight terminal 112 is watertightly installed in the second end cap through hole 122 of the dry-end end cap 12. The inner end of the watertight terminal 112 can extend into the watertight cavity 101, and the outer end of the watertight terminal 112 is exposed to the outside. The end cap circuit board 113 is fixedly installed on the inner side of the dry-end end cap 12. The inner end of the watertight terminal 112 is connected to the end cap circuit board 113. The end cap circuit board 113 can be connected to the circuit board 17 via a flexible flat cable. In the water velocity meter of the present invention, a set of screws 100 can be used to fix the watertight terminal 112 to the dry-end end cap 12, and a set of screws 100 can be used to fix the dry-end circuit board 113 to the inner side of the dry-end end cap 12. The outer end of the watertight terminal 112 of the dry terminal unit 10 can be connected to the dual-purpose towing platform to electrically connect the water velocity meter and the dual-purpose towing platform.

[0087] Reference Appendix Figure 3 , Figure 7 , Figure 8 , Figure 22 and Figure 23 The dry-end unit 10 includes a dry-end connector 114 and a spiral cable 115. The opposite ends of the spiral cable 115 are respectively connected to the circuit board 17 and the dry-end connector 114. The state of the spiral cable 115 can change as the lifting platform 16 moves up and down. When the lifting platform 16 moves down, the spiral cable 115 is stretched and deformed. When the lifting platform 16 moves down, the spiral cable 115 returns to its initial state.

[0088] Further, please refer to the appendix. Figure 3 , Figure 6 and Figure 7 The dry end unit 10 includes an indicator light 116. The dry end cover 12 has a third end cover through hole 123. The indicator light 116 is watertightly installed in the third end cover through hole 123 of the dry end cover 12. The indicator light 116 is connected to the end cover circuit board 113. The indicator light 116 is used to indicate the working status of the water velocity meter.

[0089] Further, please refer to the appendix. Figure 3 , Figures 6 to 8The dry-end unit 10 includes two buttons 117. The dry-end end cap 12 has two fourth end cap through holes 124. Each button 117 is watertightly installed in each of the fourth end cap through holes 124 of the dry-end end cap 12, and each button 117 is connected to the end cap circuit board 113. One of the two buttons 117 functions to generate a downward signal when pressed, and the other button 117 functions to generate an upward signal when pressed. When the button 117 for generating the downward signal is pressed, the drive unit 15 receives an instruction and drives the lifting platform 16 to descend, thereby switching the water velocity meter from the contracted state to the extended state. When the button 117 for generating the upward signal is pressed, the drive unit 15 receives an instruction and drives the lifting platform 16 to rise, thereby switching the water velocity meter from the extended state to the contracted state.

[0090] Reference Appendix Figures 1 to 3 , Figures 14 to 21 The wet-end unit 40 includes an electronics compartment 41, a bottom adapter 42, a top adapter 43, and a wet-end host 44. The electronics compartment 41 includes a body 411 and a processing board assembly 412. The body 411 has a cavity 4111 and a bottom opening 4112 and a top opening 4113 respectively communicating with the cavity 4111. The bottom adapter 42 is mounted on the bottom of the processing board assembly 412 and is electrically connected to the processing board assembly 412. The top adapter 43 is mounted on the top of the processing board assembly 412 and is electrically connected to the processing board assembly 412. The processing plate assembly 412, the bottom adapter 42, and the top adapter 43 are connected to the processing plate assembly 412. The processing plate assembly 412, the bottom adapter 42, and the top adapter 43 are integrated and installed in the cavity 4111 through the top opening 4113 of the housing 411. The bottom adapter 42 is used to close the bottom opening 4112 of the housing 411, and the top adapter 43 is used to close the top opening 4113 of the housing 411. The wet end host 44 is installed at the bottom of the housing 411, and the wet end host 44 and the bottom adapter 42 are electrically connected.

[0091] Reference Appendix Figure 3 The top adapter 43 is mounted on the lifting platform 16. For example, a set of screws 100 can be used to mount the top adapter 43 on the lifting platform 16, in which way the top of the wet end unit 40 is drivably mounted on the lifting platform 16.

[0092] The dry-end connector 114 is inserted into the top adapter 43 to achieve an electrical connection between the dry-end unit 10 and the wet-end unit 40. To facilitate the insertion of the dry-end connector 114 into the top adapter 43, the lifting platform 16 has a central through-hole 164. After the top adapter 43 is installed on the lifting platform 16, a portion of the top adapter 43 extends into the central through-hole 164 of the lifting platform 16, thus allowing the dry-end connector 114 to be inserted into the top adapter 43 at the top of the lifting platform 16.

[0093] In the water velocity meter described in this invention, refer to the attached... Figures 15 to 18 The bottom adapter 42 includes a bottom adapter cylinder 421, a bottom adapter plate assembly 422, and a potting section 423. The bottom adapter cylinder 421 includes a first cylinder body 4211 and a first abutment ring 4212 extending from the top edge of the first cylinder body 4211 to the surrounding area. The bottom adapter plate assembly 422 is housed in a first receiving cavity 42111 of the first cylinder body 4211. The potting section 423 is formed by the curing of glue injected into the first receiving cavity 42111 of the first cylinder body 4211. The potting section 423 encloses the middle part of the bottom adapter plate assembly 422, and the potting section 423 is sealed to the inner wall of the first cylinder body 4211 to prevent water leakage. The first male plug 4221 and the second male plug 4222 of the bottom adapter plate assembly 422 are exposed at the bottom and top of the potting section 423, respectively. The processing board assembly 412 has a first female plug 4121. After the second male plug 4222 of the bottom adapter board assembly 422 and the first female plug 4121 of the processing board assembly 412 are inserted, the bottom adapter cylinder 421 of the bottom adapter 42 is locked to the bottom of the processing board assembly 412 by the screw 100, so as to install the bottom adapter 42 to the bottom of the processing board assembly 412 and conductively connect the processing board assembly 412 and the bottom adapter board assembly 422. Preferably, the potting part 423 encapsulates the top of the first male plug 4221 and the bottom of the second male plug 4222 to prevent the first male plug 4221 and the second male plug 4222 from shaking relative to the bottom adapter cylinder 421.

[0094] The electronic compartment 41 includes a main compartment 4114 and a restraint compartment 4115. The restraint compartment 4115 is located at the bottom of the main compartment 4114. The main compartment 4114 forms a main cavity 41111 of the compartment 4111 and forms the top opening 4113. The restraint compartment 4115 forms an insertion cavity 41112 of the compartment 4111 and forms the bottom opening 4112. The first cylinder body of the bottom adapter cylinder 421... The outer diameter of the bottom adapter 4211 is the same as the inner diameter of the restraint chamber 4115 of the cabin 411. The first cylindrical body 4211 of the bottom adapter 421 extends into the insertion cavity 41112 of the cabin 411, and the first abutment ring 4212 abuts against the restraint chamber 4115. The bottom adapter 42 is thus installed at the bottom of the cabin 411, and the bottom adapter 42 closes the bottom opening 4112 of the cabin 411. Preferably, two sealing rings 200 are provided between the first cylindrical body 4211 of the bottom adapter 421 and the restraint chamber 4115 of the cabin 411 to increase the watertightness of the joint between the first cylindrical body 4211 and the restraint chamber 4115.

[0095] Reference Appendix Figure 5 , Figure 15 , Figures 19 to 21 The wet-end host 44 has an insertion slot 441 and a second female plug 442 protruding into the insertion slot 441. The restraint chamber 4115 of the cabin 411 is inserted into the insertion slot 441 of the wet-end host 44 to install the wet-end host 44 at the bottom of the electronic cabin 41. The first male plug 4221 of the bottom adapter plate assembly 422 is inserted into the second female plug 442 of the wet-end host 44 to electrically connect the wet-end host 44 and the bottom adapter plate 42, thereby electrically connecting the wet-end host 44 and the processing plate assembly 412.

[0096] Preferably, refer to the appendix Figure 1 , Figure 3 , Figure 5 , Figures 14 to 16 The wet end unit 40 includes an assembly ring 45. After the assembly ring 45 is fitted into the mounting position of the housing 411 and the wet end host 44, a set of screws 100 are used to lock the assembly ring 45, the wet end host 44 and the housing 411, so that the wet end host 44 can be reliably installed at the bottom of the housing 411.

[0097] It is understandable that, since the bottom adapter 42 is provided with the glue filling part 423 and the sealing ring 200 is provided between the first cylinder body 4211 of the bottom adapter 42 and the restraint chamber 4115 of the chamber 411, even if the wet end host 44 is hit and a gap is formed between the wet end host 44 and the electronic chamber 41 or the wet end host 44 falls off the electronic chamber 41, water will not enter the interior of the electronic chamber 41.

[0098] Reference Appendix Figure 15 and Figure 15 The top adapter 43 includes a top adapter cylinder 431 and a top adapter plate assembly 432. The top adapter cylinder 431 includes a second cylinder body 4311 and a second abutment ring 4312 extending from the top edge of the second cylinder body 4311 outwards. The top adapter plate assembly 432 is received within a second receiving cavity 43111 of the second cylinder body 4311. The top adapter plate assembly 432 has a third male plug 4321. The processing plate assembly 41 The top of component 2 has a third female plug 4122. After the third male plug 4321 of the top adapter plate assembly 432 and the first female plug 4121 of the processing plate assembly 412 are inserted, a set of screws 100 locks the top adapter cylinder 431 onto the top of the processing plate assembly 412 to install the top adapter 43 onto the top of the processing plate assembly 412 and conductively connect the processing plate assembly 412 and the top adapter plate assembly 432. The second cylinder body 4311 extends into the chamber 4111 through the top opening 4113 of the chamber 411, and the second abutment ring 4312 abuts against the top of the chamber 411 to close the top opening 4113 of the chamber 411. Preferably, the sealing ring 200 is provided between the cabin body 411 and the second cylinder body 4311 of the top adapter cylinder 431 to increase the water tightness of the joint between the cabin body 411 and the second cylinder body 4311.

[0099] In the water velocity meter of the present invention, since the dry end unit 10 and the wet end unit 40 are both relatively tall, for example, about 50 cm, the wet end unit 40 not only has a large weight, but also protrudes a long dimension when the water velocity meter is in the extended state. This results in a large distance between the bottom of the wet end unit 40 (i.e., the end where the wet end host 44 of the wet end unit 40 is located) and the dry end unit 10. During the measurement process, even if the bottom of the wet end unit 40 is subjected to a small lateral force, this force has a significant impact on the connection between the top adapter 43 of the wet end unit 40 and the lifting platform 16 of the dry end unit 10. In other words, the connection between the top adapter 43 of the wet end unit 40 and the lifting platform 16 of the dry end unit 10 is the stress concentration area of ​​the water velocity meter. Therefore, in order to ensure the reliability of the assembly relationship between the dry end unit 10 and the wet end unit 40, on the one hand, the top adapter cylinder 431 of the top adapter 43 has strong hardness. For example, the top adapter cylinder 431 can be made of alloy material to enhance the bending resistance of the top adapter cylinder 431. On the other hand, the second cylinder body 4311 of the top adapter cylinder 431 has a long length dimension, and in the height direction, the second cylinder body 4311 and the processing plate assembly 412 have multiple locking positions. That is, a set of screws 100 locks the second cylinder body 4311 and the processing plate assembly 412 along the height direction so that the top adapter cylinder 431 is reliably installed on the processing plate assembly 412.

[0100] Reference Appendix Figure 15 The top adapter plate assembly 432 of the top adapter 43 has a wet end connector 4322, and the dry end connector 114 of the dry end unit 10 and the wet end connector 4322 of the wet end unit 40 are plugged in to electrically connect the circuit board 17 and the top adapter 43.

[0101] Reference Appendix Figure 1 , Figure 3 , Figures 14 to 16 , Figures 19 to 21The wet-end host 44 includes a housing 443, a host circuit board 444, multiple transducers 445, and an adhesive part 446. The housing 443 has a housing groove 4431 and multiple mounting grooves 4432 communicating with the housing groove 4431. The host circuit board 444 is fixedly mounted on the housing 443 and located in the housing groove 4431. For example, a set of screws 100 can be used to fix the host circuit board 444 to the housing 443. The second female plug... The head 442 is mounted on and connected to the host circuit board 444. Each transducer 445 is respectively assembled into the respective mounting slots 4432 of the housing 443 and is connected to the host circuit board 444. The adhesive portion 446 is formed by the curing of adhesive poured into the shell grooves 4431 of the housing 443 and the respective mounting slots 4432. The adhesive portion 446 encapsulates each transducer 445 and wraps the bottom of the host circuit board 444. The opening of the shell grooves 4431 of the housing 443 forms the insertion slot 441 of the wet-end host 44. Thus, a set of screws 100 is used to lock the mounting ring 45, the housing 443, and the compartment 411 to reliably install the wet-end host 44 onto the bottom of the compartment 411.

[0102] In the water velocity meter of the present invention, the middle section of the housing 443 has a teardrop-shaped cross-section in the horizontal direction. When the dual-purpose towing platform carries the water velocity meter in its extended state, the shape of the housing 443 makes the water velocity meter more stable in the underwater environment, which is beneficial to improving the measurement accuracy of the water velocity meter. Furthermore, by designing the cross-sectional shape of the middle section of the housing 443 as a teardrop shape, the pressure distribution on the surface of the housing 443 can be optimized, reducing the probability of air bubbles precipitating due to pressure shearing, and preventing the sound waves emitted or received by the wet-end host 44 from passing through two different media, water and air bubbles.

[0103] Preferably, the housing 443 has at least one opening 4433. When the dual-purpose towing platform carries the water velocity meter in the extended state, water flow is allowed to pass through the opening 4433 of the housing 443. The flow velocity of the water in the opening 4433 of the housing 443 is greater than the flow velocity outside the wet end host 44. According to Bernoulli's equation, the pressure inside the opening 4433 of the housing 443 is less than the external pressure, resulting in a pressure difference between the inside and outside of the opening 433 of the housing 443. Therefore, the way in which the water flow outside the wet end host 44 applies pressure to the wet end host 44 is fixed, all directed towards the wet end host 44. In this way, the water velocity meter can avoid the problem of the wet end component 40 oscillating back and forth due to the unstable direction of the water flow outside the wet end host 44. It is understandable that the faster the dual-purpose towing platform moves, the greater the pressure difference between the inside and outside of the opening 443 of the wet end host 44, and the greater the pressure directed towards the wet end host 44 in the entire circumferential direction. Therefore, the wet end unit 40 is less likely to oscillate back and forth.

[0104] Preferably, in order to further increase the pressure difference between the inside and outside of the opening 443 of the wet end host 44, the opening size of the opening 4433 on the water-facing side of the wet end host 44 is larger than the opening size on the back side. In this way, while the external water flow velocity of the wet end host 44 remains constant, the water flow velocity entering the opening 4433 from the water-facing side of the wet end host 44 can be increased, thereby increasing the pressure difference between the inside and outside of the opening 4433 of the wet end host 44.

[0105] More preferably, the wet end host 44 has two openings 4433, and the two openings 4433 are symmetrical.

[0106] Further, see attached document. Figure 16 , Figure 19 and Figure 20The housing 443 has two adjacent electrode holes 4434, which are respectively connected to the housing groove 4431 and an opening 4433. The wet-end unit 44 includes two electrodes 447. The tops of the two electrodes 447 are fixedly mounted and electrically connected to the main circuit board 444, and the bottoms of the two electrodes 447 pass through the two electrode holes 4434 of the housing 443 and extend to the opening 4433. When the water velocity meter is in the extended state and the wet-end unit 40 is immersed in water, the two electrodes 447 are conductive to the water. When the water velocity meter is in the retracted state and the wet-end unit 40 is removed from the water, the two electrodes 447 are disconnected. Therefore, the wet-end unit 40 can be determined to be immersed in water by judging whether the two electrodes 447 are conductive. Preferably, the distance between the two electrodes 447 is 1mm-5mm so that water can conduct to the two electrodes 447.

[0107] In the water velocity meter of the present invention, the electrode 447 may be a stainless steel tube, so that the electrode 447 has good conductivity and strong hardness, wherein the top of the electrode 447 can be soldered to the main circuit board 444 after passing through the plate perforation 4441 of the main circuit board 444.

[0108] Reference Appendix Figure 19 and Figure 20 The wet-end host 44 includes a thermistor 448, which is soldered to the host circuit board 444 and extends into the electrode groove 4471 of the electrode 447. When the wet-end host 44 is working, if the water flow rate is 0, the resistance of the thermistor 448 is stable and the heat is at its highest. The faster the water flow rate, the faster the heat of the thermistor 448 decreases and the greater the change in resistance. Therefore, the water flow rate can be determined by detecting the change in resistance of the thermistor 448. It is understood that since the thermistor 448 extends into the electrode groove 4471 of the electrode 447, the electrode 447 can protect the thermistor 448.

[0109] Further, see attached document. Figure 3 , Figure 4 and Figure 23The water velocity meter includes a sealing unit 50, which includes two dustproof sealing rings 51 and an oil seal ring 52. The flange cylinder 30 has a first annular groove 31, a second annular groove 32, and a third annular groove 33. The first annular groove 31, the second annular groove 32, and the third annular groove 33 are distributed along the height direction of the flange cylinder 30. The outer side of one of the dustproof sealing rings 51 is embedded in the first annular groove 31 of the flange cylinder 30, and the inner side restrains the top of the cabin body 411 of the electronic compartment 41. The outer side of the other dustproof sealing ring 51 is embedded... The third annular groove 33 of the flange cylinder 30 is internally bound to the top of the body 411 of the electronic compartment 41. In this way, the dustproof sealing ring 51 can prevent dust and water from entering the watertight cavity 101 of the dry end unit 10 through the cylinder cavity 301 of the flange cylinder 30. The outer side of the oil seal ring 52 is embedded in the second annular groove 32 of the flange cylinder 30, and the inner side is bound to the top of the body 411 of the electronic compartment 41, so as to prevent water from entering the watertight cavity 101 of the dry end unit 10 through the cylinder cavity 301 of the flange cylinder 30.

[0110] Furthermore, the flange cylinder 30 has two fourth annular grooves 34. One fourth annular groove 34 is located between the first annular groove 31 and the second annular groove 32, and the other fourth annular groove 34 is located between the second annular groove 32 and the third annular groove 33. The water velocity meter includes two guide rings 60, each of which is fitted onto the top of the body 411 of the electronic compartment 41 and embedded in the respective fourth annular groove 34 of the flange cylinder 30. It is understood that because the dustproof sealing ring 51 has a certain elasticity, it is prone to deformation, which could lead to a risk of tilting of the wet end unit 40 during lifting and lowering. Therefore, by fitting a guide ring 60 at different positions on the top of the body 411 of the electronic compartment 41 of the wet end unit 40 and allowing the guide ring 60 to be embedded in the fourth annular groove 34 of the flange cylinder 30, the tilting of the wet end unit 40 during lifting and lowering can be prevented, ensuring that the wet end unit 40 can only lift and lower in the vertical direction.

[0111] Preferably, the guide ring 60 has an annular notch 61. When the guide ring 60 is assembled to the flange cylinder 30, pressure can be applied to the guide ring 60 through the inner wall of the flange cylinder 30. The annular notch 61 causes the guide ring 60 to be compressed and deformed (the outer diameter of the guide ring 60 becomes smaller), thus accumulating elastic potential energy. After the guide ring 60 moves to the position of the fourth annular groove 34 of the flange cylinder 30, the guide ring 60 automatically returns to its initial state and can be embedded in the fourth annular groove 34 of the flange cylinder 30. It is understood that the width of the guide ring 60 is greater than the width of the first annular groove 31 and the third annular groove 33. Therefore, during the assembly of the guide ring 60 to the flange cylinder 30, when the guide ring 60 passes through the first annular groove 31 or the third annular groove 33 of the flange cylinder 30, the guide ring 60 can be prevented from embedding in the first annular groove 31 or the third annular groove 33.

[0112] Appendix Figures 24 to 31 The assembly process of the water velocity meter of the present invention is shown below.

[0113] Reference Appendix Figure 24 After inserting the second male plug 4222 of the bottom adapter plate assembly 422 into the first female plug 4121 at the bottom of the processing plate assembly 412, a set of screws 100 is used to lock the first cylindrical body 4211 of the bottom adapter tube 421 onto the bottom of the processing plate assembly 412, thereby installing the bottom adapter plate assembly 422 onto the bottom of the processing plate assembly 412. After inserting the third male plug 4321 of the top adapter plate assembly 432 into the third female plug 4122 at the top of the processing plate assembly 412, a set of screws 100 is used to lock the second cylindrical body 4311 of the top adapter tube 431 onto the top of the processing plate assembly 412, thereby installing the top adapter plate assembly 432 onto the top of the processing plate assembly 412. At this time, the processing plate assembly 412, the bottom adapter 42, and the top adapter 43 are a single unit.

[0114] Reference Appendix Figure 25After the sealing rings 200 are respectively fitted onto the first cylindrical body 4211 and the second cylindrical body 4322, the entire assembly formed by the processing plate assembly 412, the bottom adapter 42, and the top adapter 43 is inserted into the chamber 4111 through the top opening 4113 of the chamber 411. The first cylindrical body 4211 of the bottom adapter cylinder 421 extends into the insertion cavity 41112 of the chamber 411, the first abutment ring 4212 abuts against the restraint chamber 4115, and the sealing rings 200 fitted onto the first cylindrical body 4211 are located within the... Between the first cylindrical body 4211 and the restraint chamber 4115, the bottom adapter 42 closes the bottom opening 4112 of the chamber 411, wherein the second cylindrical body 4311 extends into the chamber 4111 through the top opening 4113 of the chamber 411, the second abutment ring 4312 rests against the top of the chamber 411, and the sealing ring 200 fitted onto the second cylindrical body 4311 is located between the second cylindrical body 4311 and the chamber 411, thereby closing the top opening 4113 of the chamber 411.

[0115] Reference Appendix Figure 26 When the restraint chamber 4115 of the housing 411 is inserted into the insertion slot 441 of the wet end unit 44, the first male plug 4221 of the bottom adapter plate assembly 422 is allowed to be inserted into the second female plug 442 of the wet end unit 44 to conductively connect the wet end unit 44 and the bottom adapter 42. Then, after the assembly ring 45 is fitted into the installation position of the housing 411 and the wet end unit 44, a set of screws 100 is used to lock the assembly ring 45, the wet end unit 44 and the housing 411 to reliably install the wet end unit 44 at the bottom of the housing 411, thus completing the assembly of the wet end unit 40.

[0116] Reference Appendix Figure 27 After embedding each of the guide rings 60 into the fourth annular grooves 34 of the flange cylinder 30, embedding the outer side of the oil seal ring 52 into the second annular groove 32 of the flange cylinder 30, and embedding each of the dustproof sealing rings 51 into the first annular groove 31 and the third annular groove 33 of the flange cylinder 30, the flange cylinder 30 is fitted onto the wet end unit 40 from bottom to top, so that each of the dustproof sealing rings 51, the oil seal ring 52, and each of the guide rings 60 is fitted onto the top of the compartment 411. It is understood that the inner sides of each of the dustproof sealing rings 51 and the oil seal rings 52 respectively restrain the top of the compartment 411 to prevent water leakage at the assembly position of the flange cylinder 30 and the compartment 411, and to allow the wet end unit 40 to reciprocate relative to the flange cylinder 30.

[0117] Reference Appendix Figure 28 The dry-end unit 10 is assembled except for the dry-end cylinder 11, the dry-end end cap 12, the watertight terminal 112 and the end cap circuit board 113.

[0118] Reference Appendix Figure 29 After the dry connector 114 of the dry unit 10 is inserted into the wet connector 4322 of the wet unit 40, a set of screws 100 is used to lock the dry connector 114 and the wet connector 4322 to electrically connect the circuit board 17 and the top adapter 43.

[0119] Reference Appendix Figure 30 After a sealing ring 200 is fitted onto the top of the flange cylinder 30, the dry end cylinder 11 is installed, wherein the bottom of the dry end cylinder 11 and the top of the flange cylinder 30 are locked by a set of screws 100, and the sealing ring 200 fitted onto the flange cylinder 30 is located between the bottom of the dry end cylinder 11 and the top of the flange cylinder 30.

[0120] Reference Appendix Figure 31 After a sealing ring 200 is fitted onto the dry end cap 12, the end cap circuit board 113 and the circuit board 17 are connected using a flexible flat cable. Then, the dry end cap 12 is installed on the top of the dry end cylinder 11. Subsequently, a set of screws 100 are used to lock the dry end cylinder 11 and the dry end cap 12, thus completing the assembly of the water velocity meter.

[0121] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the present invention. The objectives of the present invention have been fully and effectively achieved. The functions and structural principles of the present invention have been demonstrated and explained in the embodiments, and any variations or modifications may be made to the implementation of the present invention without departing from the stated principles.

Claims

1. A water velocity meter, characterized in that, include: Waterproof and breathable valve; A dry-end unit, wherein the dry-end unit has a watertight cavity, and a waterproof and breathable valve is installed on the dry-end unit, the waterproof and breathable valve connecting the watertight cavity to the external environment; A flange cylinder having a cavity, the flange cylinder being installed at the bottom of the dry end unit, the cavity of the flange cylinder being connected to the watertight cavity of the dry end unit; as well as A wet end unit, wherein the top of the wet end unit extends into the watertight cavity of the dry end unit after passing through the cavity of the flange cylinder, and the wet end unit is drivably connected to the dry end unit and is driven by the dry end unit to raise and lower.

2. The water velocity meter according to claim 1, wherein the dry end unit includes a dry end cylinder, a dry end cap, a motor bracket, an assembly column, a drive unit, and a lifting platform; the bottom of the dry end cylinder is mounted on the top of the flange cylinder; the dry end cap is mounted on the top of the dry end cylinder to form the watertight cavity between the dry end cylinder and the dry end cap; the opposite ends of the assembly column are respectively mounted on the flange cylinder and the motor bracket to hold the motor bracket on the top of the watertight cavity; the drive unit includes a drive motor assembly and a lead screw; the drive motor assembly is mounted on the motor bracket; the top of the lead screw shaft is drivably connected to the drive motor assembly; the nut of the lead screw is fixedly mounted on the lifting platform; and the top of the wet end unit is mounted on the lifting platform.

3. The water velocity meter according to claim 2, wherein the drive unit includes a top bearing assembly, a bottom bearing assembly, a drive gear, and a driven gear, the top bearing assembly is mounted on the motor bracket, the bottom bearing assembly is mounted on the top of the flange cylinder, the opposite ends of the lead screw shaft are respectively mounted on the top bearing assembly and the bottom bearing assembly, the drive gear is fixedly mounted on the output shaft of the drive motor assembly, the driven gear is fixedly fitted onto the top of the lead screw shaft, and the driven gear is meshed with the drive gear.

4. The water velocity meter according to claim 3, wherein the dry end unit includes an anti-collision part, the anti-collision part includes a top anti-collision rod and a bottom anti-collision rod, the top end of the top anti-collision rod is installed below the motor bracket, the bottom end of the top anti-collision rod extends toward the lifting platform, the bottom end of the bottom anti-collision rod is installed on the top of the flange cylinder, and the top end of the bottom anti-collision rod extends toward the lifting platform.

5. The water velocity meter according to claim 3, wherein the dry end unit includes a position detection unit, the position detection unit includes a top position detection component and a bottom position detection component, the top position detection component is installed below the motor bracket for detecting whether the lifting platform has moved upward to a preset position, and the bottom detection component is installed on the top of the flange cylinder for detecting whether the lifting platform has moved downward to a preset position.

6. The water velocity meter according to any one of claims 2 to 5, wherein the dry end cap has a first end cap perforation, and the waterproof and breathable valve is installed in the first end cap perforation of the dry end cap.

7. The water velocity meter according to claim 6, wherein the waterproof and breathable valve includes a valve body, a valve core, a first waterproof and breathable membrane, a second waterproof and breathable membrane, and a valve cover; the valve body has a valve cavity and a valve hole extending downward from the valve cavity; the valve core has a core hole; the first waterproof and breathable membrane and the second waterproof and breathable membrane are respectively disposed on opposite sides of the valve core to close the two openings of the core hole; the first waterproof and breathable membrane and the valve core are housed in the valve cavity of the valve body in such a way that the core hole of the valve core corresponds to the valve hole of the valve body; the edge of the first waterproof and breathable membrane is clamped between the valve body and the valve core; the valve cover is installed on the top of the valve body in such a way that an air passage is formed between the valve cover and the valve body; and the edge of the second waterproof and breathable membrane is clamped between the valve core and the valve cover.

8. The water velocity meter according to claim 7, wherein the valve body has a top notch communicating with the air passage, and a gap is formed between the peripheral wall of the valve cover and the top of the valve body communicating with the top notch, wherein the peripheral wall of the valve cover covers the top notch of the valve body.

9. The water velocity meter according to any one of claims 2 to 5, wherein the dry-end unit comprises a circuit board, a dry-end connector, and a spiral cable, the opposite ends of the spiral cable being connected to the circuit board and the dry-end connector respectively, wherein the time-end unit comprises an electronics compartment, a bottom adapter, a top adapter, and a wet-end host, the electronics compartment comprising a compartment body and a processing board assembly, the compartment body having a compartment cavity and a bottom opening and a top opening respectively communicating with the compartment cavity, the processing board assembly being housed in the compartment cavity of the compartment body, the bottom adapter being installed at the bottom of the compartment body for closing the bottom opening of the compartment body, the processing board assembly and the bottom adapter being electrically connected, the top adapter being installed at the top of the compartment body for closing the top opening of the compartment body, the processing board assembly and the top adapter being electrically connected, the wet-end host being installed at the bottom of the compartment body, the wet-end host being electrically connected to the bottom adapter, wherein the top adapter is installed on the lifting platform, and the dry-end connector is inserted into the top adapter.

10. The water velocity meter according to any one of claims 1 to 5, wherein the water velocity meter includes a sealing unit, the sealing unit including two dustproof sealing rings and an oil seal ring, the flange having a first annular groove, a second annular groove and a third annular groove, the first annular groove, the second annular groove and the third annular groove being distributed along the height direction of the flange, the outer side of one of the dustproof sealing rings being embedded in the first annular groove of the flange and the inner side binding the top of the wet end unit, the outer side of the other dustproof sealing ring being embedded in the third annular groove of the flange and the inner side binding the top of the wet end unit, and the outer side of the oil seal ring being embedded in the second annular groove of the flange and the inner side binding the top of the wet end unit.

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