Water speed meter, test method and test tool for pressure resistance of water speed meter

Abstract

The application discloses a water speed instrument and a method for testing pressure resistance of the water speed instrument. The method comprises the following steps: installing a flange barrel of the water speed instrument on a pressure tank in a mode that a wet end unit of the water speed instrument extends into a pressure maintaining cavity of the pressure tank through a hatch of the pressure tank; pressurizing water pressure in the pressure maintaining cavity of the pressure tank to a preset value; and selectively allowing water inlet of a water inlet hole of the pressure tank or water outlet of a water outlet hole in a process that a dry end unit of the water speed instrument drives the wet end unit to ascend and descend, so that the water pressure in the pressure maintaining cavity of the pressure tank is maintained stable.

Description

Technical Field

[0001] This invention relates to the field of hydrological characteristic measurement, and in particular to a water velocity meter, a method for testing the pressure resistance performance of the water velocity meter, and a testing fixture. Background Technology

[0002] In fields such as water conservancy engineering, hydrological monitoring, marine exploration, and industrial fluid control, accurate measurement of water flow velocity is crucial for ensuring the safe operation of projects, achieving scientific scheduling, and efficient production. Water velocity meters (or speed meters) are the core equipment for measuring water flow velocity, and their stable operation and reliability directly determine the accuracy of the relevant data. In recent years, with the continuous expansion of application scenarios, the application scenarios of water velocity meters need to be extended to dual-purpose towed platforms. Dual-purpose towed platforms can operate not only in aquatic environments but also in land environments. Understandably, the water velocity meter is only permitted to be submerged in water to measure water flow velocity when the dual-purpose towed platform is operating in aquatic environments. When operating in land environments, the water velocity meter must be retracted to prevent damage from collisions. However, there are currently no water velocity meters on the market that are suitable for dual-purpose towing platforms. Therefore, the inventors of this invention aim to invent a water velocity meter that can be applied to dual-purpose towing platforms. In addition, the inventors of this invention also need to design a tooling and method for testing the water velocity meter, to test the pressure resistance performance of the water velocity meter, in order to evaluate the reliability of the water velocity meter. Summary of the Invention

[0003] One object of the present invention is to provide a water velocity meter, a method for testing the pressure resistance performance of the water velocity meter, and a testing fixture, wherein the dry end unit of the water velocity meter can drive the wet end unit to rise and fall, so that the water velocity meter can be installed on a dual-purpose towing platform. When the dual-purpose towing platform is traveling in a water environment, the dry end unit drives the wet end unit to fall so that the wet end unit can be inserted into the water for measuring the water flow velocity. Before the dual-purpose towing platform is traveling in a land environment, the dry end unit drives the wet end unit to rise, so that when the dual-purpose towing platform is traveling in a land environment, the water velocity meter can avoid the wet end unit being collided with.

[0004] One object of the present invention is to provide a water velocity meter, a method for testing the pressure resistance performance of the water velocity meter, and a testing fixture, wherein after the flange of the water velocity meter is installed in the pressure chamber of the testing fixture, the dry end unit can drive the wet end unit to descend into the pressure holding chamber of the pressure chamber, and the water pressure in the pressure holding chamber can be pressurized to a preset value to test the pressure resistance performance of the water velocity meter in a preset water pressure environment, so as to evaluate the reliability of the water velocity meter.

[0005] One object of the present invention is to provide a water velocity meter, a method for testing the pressure resistance performance of the water velocity meter, and a testing fixture, wherein as the dry end unit drives the wet end unit to rise and fall within the pressure holding chamber of the pressure chamber, by selectively allowing water to enter through the water inlet or drain through the water outlet of the pressure chamber, the water pressure within the pressure chamber can be maintained stable, so as to test the pressure resistance performance of the water velocity meter in a constant water pressure environment.

[0006] One object of the present invention is to provide a water velocity meter, a method for testing the pressure resistance performance of the water velocity meter, and a testing fixture, wherein the dry end unit can drive the wet end unit to rise and fall rapidly in order to test the water velocity meter's resistance to dynamic pressure fluctuations.

[0007] According to one aspect of the present invention, the present invention provides a method for testing the pressure resistance performance of a water velocity meter, characterized in that the testing method includes the following: S1, the flange of the water velocity meter is installed on the test fixture by extending the wet end unit of the water velocity meter into the pressure holding chamber through the hatch of the pressure chamber. S2, pressurize the water pressure in the pressure-holding chamber of the pressure chamber to a preset value; S3, during the process of the dry end unit of the water velocity meter driving the wet end unit to rise and fall, selectively allowing water to enter through the water inlet or drain through the water outlet of the pressure chamber, so as to keep the water pressure in the pressure holding chamber of the pressure chamber stable.

[0008] According to one embodiment of the present invention, in step S3, when the dry end unit drives the wet end unit to rise, the controller controls the pressurization pump installed in the water inlet of the pressure chamber to inject water into the pressure holding chamber through the water inlet. When the dry end unit drives the wet end unit to descend, the controller controls the solenoid valve of the drain hole installed in the pressure chamber to switch to the open state, so as to allow the water in the pressure holding chamber to be discharged through the drain hole of the pressure chamber.

[0009] According to one embodiment of the present invention, in step S2, the water pressure in the pressure-holding chamber of the pressure chamber is measured by a pressure gauge installed in the pressure gauge interface of the pressure chamber, so that in step S3, the controller controls the working state of the pressurization pump and the solenoid valve according to the measurement result of the pressure gauge.

[0010] According to one embodiment of the present invention, in step S3, when the water inlet of the pressure chamber is not filled with water and the drain hole is not drained, it is determined whether the wet end unit is leaking water based on the measurement result of the pressure gauge.

[0011] According to one embodiment of the present invention, in step S3, when the water inlet of the pressure chamber is not filled with water and the drain hole is not drained, the measurement result of the pressure sensor inside the wet end unit is used to determine whether the wet end unit is leaking water.

[0012] According to one embodiment of the present invention, in step S3, when the water inlet of the pressure chamber is not filled with water and the drain hole is not drained, it is determined whether the wet end unit is leaking water based on the measurement result of the humidity sensor inside the wet end unit.

[0013] According to one embodiment of the present invention, in step S3, the dry end unit is allowed to drive the wet end unit to move up and down rapidly in order to test the water velocity meter's resistance to dynamic pressure fluctuations.

[0014] According to one embodiment of the present invention, in step S3, during the process of the dry end unit driving the wet end unit to rise and fall, the waterproof and breathable valve of the dry end unit is allowed to enter or exit air in order to balance the internal and external air pressure of the watertight cavity of the dry end unit.

[0015] According to another aspect of the present invention, the present invention further provides a test fixture, which includes a pressurizing pump, a solenoid valve, and a pressure chamber, wherein the pressure chamber includes a pressure-holding cavity and a hatch, a water inlet, and a drain hole respectively connected to the pressure-holding cavity. The pressurizing pump is installed at the water inlet of the pressure chamber, and the solenoid valve is installed at the drain hole of the pressure chamber. After the flange of the water velocity meter is installed in the pressure chamber, the wet end unit of the water velocity meter can extend into the pressure-holding cavity through the hatch of the pressure chamber.

[0016] According to one embodiment of the present invention, the test fixture includes a pressure gauge, the pressure chamber has a pressure gauge interface, the pressure gauge interface is connected to the pressure holding chamber, and the pressure gauge is installed on the pressure gauge interface. Attached Figure Description

[0017] Figure 1 This is a three-dimensional schematic diagram of a water velocity meter in its extended state according to a preferred embodiment of the present invention.

[0018] Figure 2 This is a cross-sectional schematic diagram of the water velocity meter in the extended state according to the above-described preferred embodiment of the present invention.

[0019] Figure 3 This is a three-dimensional schematic diagram of the water velocity meter in the contracted state according to the above-described preferred embodiment of the present invention.

[0020] Figure 4 This is a cross-sectional schematic diagram of the water velocity meter in the contracted state according to the above-described preferred embodiment of the present invention.

[0021] Figure 5 This is a partial sectional view of a dry-end unit of the water velocity meter according to the above-described preferred embodiment of the present invention.

[0022] Figure 6 yes Figure 5 A magnified view of a local location.

[0023] Figure 7 This is a perspective view of a partial structure of the dry-end unit of the water velocity meter according to the above-described preferred embodiment of the present invention.

[0024] Figure 8 This is a perspective view of another partial structure of the dry-end unit of the water velocity meter according to the above-described preferred embodiment of the present invention.

[0025] Figure 9 This is an exploded view of another partial structure of the dry-end unit of the water velocity meter according to the above-described preferred embodiment of the present invention.

[0026] Figure 10 This is an exploded view of another perspective of the partial structure of the dry end unit of the water velocity meter according to the above-described preferred embodiment of the present invention.

[0027] Figure 11 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.

[0028] Figure 12 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.

[0029] Figure 13 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.

[0030] Figure 14 This is an exploded view of a partial structure of the wet end unit of the water velocity meter according to the above-described preferred embodiment of the present invention.

[0031] Figure 15 This is an exploded view of another perspective of the partial structure of the wet end unit of the water velocity meter according to the above-described preferred embodiment of the present invention.

[0032] Figure 16 This is a cross-sectional schematic diagram showing a location of a wet-end host of the wet-end unit of the water velocity meter according to the above-described preferred embodiment of the present invention.

[0033] Figure 17This 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.

[0034] Figure 18 This is a perspective view of a test fixture according to a preferred embodiment of the present invention.

[0035] Figure 19 This is a perspective view of a pressure chamber of the test fixture according to the above-described preferred embodiment of the present invention.

[0036] Figure 20 This is an exploded view of the pressure chamber of the test fixture according to the above-described preferred embodiment of the present invention.

[0037] Figure 21 This is a cross-sectional schematic diagram of the pressure chamber of the test fixture according to the above-described preferred embodiment of the present invention.

[0038] Figure 22 This is a three-dimensional schematic diagram of the pressure resistance performance of the water velocity meter being tested using the aforementioned testing fixture.

[0039] Figure 23 This is a cross-sectional schematic diagram of a state when the pressure resistance performance of the water velocity meter is tested using the aforementioned testing fixture.

[0040] Figure 24 This is a cross-sectional schematic diagram of another state when the pressure resistance performance of the water velocity meter is tested using the aforementioned testing fixture.

[0041] Figure 25 yes Figure 24 The first magnified view of a local location.

[0042] Figure 26 yes Figure 24 The second magnified view of a local location.

[0043] Figure 27 yes Figure 24 The third magnified view of a local location.

[0044] Figure 28 yes Figure 24 The fourth magnified view of a local location. Detailed Implementation

[0045] The technical solutions in the embodiments of this application will now be described with reference to the accompanying drawings. The terminology used in the following embodiments is for the purpose of describing specific embodiments only and is not intended to limit the scope of this application. As used in the specification and appended claims of this application, the singular expressions “a,” “an,” “the,” “the,” “the,” and “this” are intended to also include expressions such as “one or more,” unless the context clearly indicates otherwise. It should also be understood that in the following embodiments of this application, “at least one” and “one or more” refer to one, two, or more than two. The term “and / or” is used to describe the relationship between related objects, indicating that three relationships can exist; for example, A and / or B can represent: A alone, A and B simultaneously, or B alone, where A and B can be singular or plural. The character “ / ” generally indicates that the preceding and following related objects are in an “or” relationship.

[0046] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0047] Figure 1 and Figure 2 These are schematic diagrams of a water velocity meter 100 in its extended state, provided by a preferred embodiment of the present invention. Figure 3 and Figure 4 These are schematic diagrams of the water velocity meter 100 of the present invention in its contracted state. The water velocity meter 100 includes a dry end unit 10 and a wet end unit 20. The wet end unit 20 is drivably connected to the dry end unit 10. The dry end unit 10 drives the wet end unit 20 to move up and down, thereby switching the water velocity meter 100 between an extended state and a contracted state. Specifically, when the dry end unit 10 drives the wet end unit 20 to rise, the water velocity meter 100 switches from an extended state to a contracted state; when the dry end unit 10 drives the wet end unit 20 to fall, the water velocity meter 100 switches from a contracted state to an extended state.

[0048] Reference Appendix Figures 1 to 5 , Figures 7 to 10 , Figure 23 , Figure 24 and Figure 26 The water velocity meter 100 also includes a flange unit 30, which includes a flange cylinder 31. The flange cylinder 31 is fitted onto the wet end unit 20 and is installed at the bottom of the dry end unit 10. The bottom of the dual-purpose towing platform has a platform hole. The flange cylinder 31 is installed at the bottom of the dual-purpose towing platform, and the bottom of the flange cylinder 31 corresponds to the platform hole. In this way, the dry end unit 10 is held inside the dual-purpose towing platform, while the wet end unit 20 can extend to the outside through the platform hole of the dual-purpose towing platform. Specifically, when the dry end unit 10 drives the wet end unit 20 to descend, causing the water velocity meter 100 to switch from a retracted state to an extended state, the bottom of the wet end unit 20 extends outward after passing through the platform hole of the dual-purpose towing platform, allowing the bottom of the wet end unit 20 to enter the water for measuring water flow velocity. This enables the water velocity meter 100 to function as a speed sensor for the dual-purpose towing platform. When the dry end unit 10 drives the wet end unit 20 to rise, causing the water velocity meter 100 to switch from an extended state to a retracted state, the bottom of the wet end unit 20 retracts into the flange cylinder 31 after passing through the platform hole of the dual-purpose towing platform, preventing the wet end unit 20 from being collided with when the dual-purpose towing platform is traveling in a land environment.

[0049] Since the bottom of the flange cylinder 31 and the bottom of the dual-purpose towing platform are fixedly installed, for example, a set of bolts can lock the bottom of the flange cylinder 31 to the bottom of the dual-purpose towing platform. Therefore, a sealing gasket can be set between the bottom of the flange cylinder 31 and the bottom of the dual-purpose towing platform to achieve a watertight connection.

[0050] The flange cylinder 31 and the wet end unit 20 are movably connected. The dry end unit 10 can drive the wet end unit 20 to reciprocate relative to the flange cylinder 31, allowing the water velocity meter 100 to switch between an extended state and a retracted state. Therefore, to achieve a watertight connection between the flange cylinder 31 and the wet end unit 20, refer to the attached... Figure 23 , Figure 24 and Figure 26In the water velocity meter 100 of the present invention, along the height direction, the inner wall of the flange cylinder 31 is provided with a first fitting groove 311, a second fitting groove 312 and a third fitting groove 313. The flange unit 30 includes a first dustproof sealing ring 32, an oil seal ring 33 and a second dustproof sealing ring 34. The outer side of the first dustproof sealing ring 32 is embedded in the first fitting groove 311 of the flange cylinder 31, and the inner side of the first dustproof sealing ring 32 binds the top of the wet end unit 20. The outer side of the oil seal ring 33 is embedded in the second fitting groove 312 of the flange cylinder 31, and the inner side of the oil seal ring 33 binds the wet end unit 20. The outer side of the second dustproof sealing ring 34 is embedded in the third fitting groove 313 of the flange cylinder 31, and the inner side of the second dustproof sealing ring 34 binds the wet end unit 20. The first dustproof sealing ring 32, the oil seal ring 33, and the second dustproof sealing ring 34 cooperate with each other, which not only allows the wet end unit 20 to reciprocate relative to the flange cylinder 31 when driven by the dry end unit 10, but also achieves a watertight connection between the flange cylinder 31 and the wet end unit 20, preventing water from flowing through the joint between the flange cylinder 31 and the wet end unit 20.

[0051] Furthermore, the inner wall of the flange cylinder 31 is provided with a fourth fitting groove 314 and a fifth fitting groove 315. The fourth fitting groove 314 is located between the first fitting groove 311 and the second fitting groove 312, and the fifth fitting groove 315 is located between the second fitting groove 312 and the third fitting groove 313. The flange unit 30 also includes a first guide ring 35 and a second guide ring 36. The first guide ring 35 is embedded in the fourth fitting groove 314 of the flange cylinder 31 and is fitted onto the wet end unit 20. The second guide ring 36 is embedded in the fifth mounting groove 315 of the flange cylinder 31 and is fitted onto the wet end unit 20. The first guide ring 35 and the second guide ring 36 have high strength and are not easily deformed. Thus, the first guide ring 35 and the second guide ring 36 cooperate with each other to limit the movement direction of the wet end unit 20 to the height direction, avoiding the problem of the wet end unit 20 tilting during movement due to the easy deformation of the first dustproof sealing ring 32, the oil seal ring 33 and the second dustproof sealing ring 34.

[0052] In the water velocity meter 100 of the present invention, the first guide ring 35 and the second guide ring 36 can be made of composite materials, such as polyoxymethylene, polytetrafluoroethylene, phenolic resin, etc., so that the first guide ring 35 and the second guide ring 36 have strong strength and are not easily deformed.

[0053] To facilitate the embedding of the first guide ring 35 and the second guide ring 36 into the fourth fitting groove 314 and the fifth fitting groove 315 of the flange cylinder 31, respectively, in the water velocity meter 100 of the present invention, firstly, the width dimensions of the first fitting groove 311, the second fitting groove 312, and the third flange cylinder 313 of the flange cylinder 31 are smaller than the width dimensions of the fourth fitting groove 314 and the fifth fitting groove 315; secondly, both the first guide ring 35 and the second guide ring 36 are provided with a ring body notch 361, as shown in the attached figure. Figure 9 This allows the first guide ring 35 and the second guide ring 36 to deform slightly in the circumferential direction when squeezed by the inner wall of the flange cylinder 31, thereby reducing the outer diameter of the first guide ring 35 and the second guide ring 36.

[0054] Specifically, the process of embedding the second guide ring 36 into the fifth fitting groove 315 of the flange cylinder 31 is as follows: First, the second guide ring 36 is placed in the flange cylinder 31. Since the second guide ring 36 has the ring body notch 361, the inner wall of the flange cylinder 31 can squeeze the second guide ring 36, causing the second guide ring 36 to deform slightly and reduce its outer diameter. At this time, the second guide ring 36 accumulates elastic potential energy due to elastic deformation. Second, the second guide ring 36 is pushed to slide inside the flange cylinder 31. Since the width of the second guide ring 36 is greater than the... The width dimensions of the first fitting groove 311 and the second fitting groove 312 of the flange cylinder 31 are such that when the second guide ring 36 is pushed to slide inside the flange cylinder 31, it can prevent the second guide ring 36 from falling into the first fitting groove 311 and the second fitting groove 312 of the flange cylinder 31. When the second guide ring 36 slides to the position of the fifth fitting groove 315 of the flange cylinder 31, the second guide ring 36 is locked into the fifth fitting groove 315 of the flange cylinder 31 after returning to the initial state, thus embedding the second guide ring 36 into the fifth fitting groove 315 of the flange cylinder 31.

[0055] It is understood that the process of embedding the first guide ring 35 into the fourth mounting groove 314 of the flange cylinder 31 is the same as the process of embedding the second guide ring 36 into the fifth mounting groove 315 of the flange cylinder 31, and will not be described in detail here.

[0056] Reference Appendix Figure 2 , Figure 4 , Figures 7 to 10 , Figure 23 and Figure 24The dry-end unit 10 includes a frame assembly 11, which includes a top frame 111 and at least one frame support column 112. The bottom of the frame support column 112 is installed on the top of the flange cylinder 31, and the top of the frame support column 112 is installed on the top frame 111, so that the top frame 111 is supported above the flange cylinder 31 by the frame support column 112.

[0057] In a specific example of the water velocity meter 100 of the present invention, the number of the frame support columns 112 is three, and the three frame support columns 112 are arranged at intervals to stably support the top frame 111 above the flange cylinder 31 by these frame support columns 112.

[0058] In a specific example of the water velocity meter 100 of the present invention, a screw can be used to install the bottom of the frame support column 112 to the top of the flange cylinder 31, and a screw can be used to install the top of the frame support column 112 to the edge portion of the top frame 111.

[0059] The top frame 111 has at least one first top frame hole 1111 and at least one second top frame hole 1112. The dry-end unit 10 further includes a lifting platform 12 and at least one drive assembly 13, wherein the lifting platform 12 has at least one platform through hole 121, and wherein the drive assembly 13 includes a drive motor 131, a first bearing portion 132, a second bearing portion 133, a lead screw 134, a drive wheel 135, and a driven wheel 136. The drive motor 131 has a motor 1311 and a drive shaft 1312. The motor 1311 is mounted on the top of the top frame 111, and the drive shaft 1312 extends through the first top frame hole 1111 of the top frame 111 to the lower part of the top frame 111. The drive wheel 135 is fixedly fitted onto the drive shaft 1312. The drive motor 1311 outputs power by driving the drive shaft 1312 to rotate around its own central axis. The drive wheel 135 rotates synchronously, driven by the drive wheel 135. The first bearing portion 132 is mounted on the top of the top frame 111, and the second bearing portion 133 is mounted on the top of the flange cylinder 31. The lead screw 134 includes a lead screw shaft 1341 and a nut 1342 screwed onto the lead screw shaft 1341. The driven wheel 136 is fixedly fitted onto the top of the lead screw shaft 1341. The nut 1342 is mounted on the lifting platform 12 such that the bottom of the lead screw shaft 1341 passes through the platform through hole 121 of the lifting platform 12. The top of the lead screw shaft 1341 passes through the second top frame hole 1112 of the top frame 111 and is mounted on the first bearing portion 132. The bottom of the lead screw shaft 1341 is mounted on the second bearing portion 133. The drive wheel 135 and the driven wheel 136 mesh.

[0060] Preferably, the lifting platform 12 has at least one platform clearance slot 122 for avoiding the frame support column 112. In this specific example of the water velocity meter 100 of the present invention, the lifting platform 12 has three platform clearance slots 122, and the three platform clearance slots 122 respectively avoid the three frame support columns 112.

[0061] Preferably, the bottom of the first bearing portion 132 is inserted into the second top frame hole 1112 of the top frame 111, so that the first bearing portion 132 is reliably installed on the top frame 111. Preferably, the top of the flange cylinder 31 is provided with at least one shaft clearance groove 316 to allow clearance from the bottom of the lead screw shaft 1341.

[0062] In a specific example of the water velocity meter 100 of the present invention, a set of screws is used to install the motor 1311 onto the top frame 111, a set of screws is used to install the first bearing portion 132 onto the top frame 111, a set of screws is used to install the second bearing portion 133 onto the top of the flange cylinder 31, and a set of screws is used to install the nut 1342 onto the lifting platform 12.

[0063] The wet end unit 20 is mounted on the lifting platform 12. For example, a set of screws is used to mount the wet end unit 20 on the lifting platform 12 so that the wet end unit 20 is drivably connected to the dry end unit 10. Specifically, when the motor 1311 drives the drive shaft 1312 to rotate in one direction around its own central axis, the power output by the drive shaft 1312 is transmitted to the lead screw shaft 1341 via the driving wheel 135 and the driven wheel 136, so as to drive the lead screw shaft 1341 to rotate in one direction around its own central axis. The lead screw shaft 1341 and the nut 1342 cooperate with each other to drive the lifting platform 12 to move upward. The lifting platform 12 drives the wet end unit 20 to rise, allowing the water velocity meter 100 to switch from the extended state to the retracted state. Correspondingly, when the motor 1311 drives the drive shaft 1312 to rotate in the opposite direction around its own central axis, the power output by the drive shaft 1312 is transmitted to the lead screw 1341 through the driving wheel 135 and the driven wheel 136, so as to drive the lead screw 1341 to rotate in the opposite direction around its own central axis. The lead screw 1341 and the nut 1342 cooperate with each other to drive the lifting platform 12 to move downward. The lifting platform 12 drives the wet end unit 20 to descend, so as to allow the water velocity meter 100 to switch from the retracted state to the extended state.

[0064] In a specific example of the water velocity meter 100 of the present invention, the number of the drive components 13 is three. The three drive components 13 cooperate with each other, which can not only provide sufficient driving force to drive the lifting platform 12 and the wet end unit 20 to rise and fall quickly, but also make the lifting platform 12 bear the force evenly, so as to avoid the lifting platform 12 and the wet end unit 20 tilting during the lifting process.

[0065] Reference Appendix Figure 2 , Figure 4 , Figures 7 to 10 , Figure 23 , Figure 24 and Figure 27The drive assembly 13 includes a gear housing 137 having a cavity 1371 and at least one bore 1372 communicating with the cavity 1371. The gear housing 137 is mounted on the top frame 111, which closes the opening of the cavity 1371 of the gear housing 137. The driving wheel 135 and the driven wheel 136 are located in the cavity 1371 of the gear housing 137. The top of the lead screw shaft 1341 of the lead screw 134 passes through the bore 1372 of the gear housing 137. The gear housing 137 is filled with lubricating grease to lubricate the driving wheel 135 and the driven wheel 136. Preferably, the outer diameter of the top bracket 111 is the same as the inner diameter of the cavity 1371 of the gear housing 137. After the top bracket 111 is lowered to the cavity 1371 of the gear housing 137, a set of screws is used to lock the gear housing 137 and the top bracket 111 to install the gear housing 137 onto the top bracket 111.

[0066] Reference Appendix Figure 7 , Figure 8 , Figure 27 and Figure 28 The dry-end unit 10 includes a first circuit board 14, and the frame assembly 11 includes at least one plate support column 113. The bottom of the plate support column 113 is mounted on the top frame 111, and the top of the plate support column 113 is mounted on the first circuit board 14. The plate support column 113 supports the first circuit board 14 to a position above the motor 1311 of the drive motor 131, making the structure of the dry-end unit 10 more compact. The motor 1311 of the drive motor 131 is controllably connected to the first circuit board 14, and the first circuit board 14 controls the working state of the motor 1311. In this specific example of the water velocity meter 100 of the present invention, the first circuit board 14 can control the motors 1311 of the drive motor 131 to work synchronously to drive the lifting platform 12 to rise and fall smoothly.

[0067] In a specific example of the water velocity meter 100 of the present invention, the number of plate support columns 113 is three, and the three plate support columns 113 are arranged at intervals to stably support the first circuit board 14 above the motor 1311 of the drive motor 131 by these plate support columns 113.

[0068] In a specific example of the water velocity meter 100 of the present invention, one screw can be used to mount the bottom of the plate support column 113 to the edge portion of the top frame 111, and another screw can be used to mount the top of the plate support column 113 to the first circuit board 14.

[0069] Reference Appendix Figures 7 to 10 The dry end unit 10 includes an anti-collision part 15, which includes at least one top anti-collision component 151 and at least one bottom anti-collision component 152. The top of the top anti-collision component 151 is mounted on the top frame 111, and the bottom extends toward the lifting platform 12. When the drive component 13 drives the lifting platform 12 to move upward, the bottom of the top anti-collision component 151 can abut against the lifting platform 12 to limit the maximum upward movement of the lifting platform 12 and prevent the nut 1342 from hitting the gear housing 137. The bottom of the bottom anti-collision component 152 is mounted on the top of the flange cylinder 31, and the top extends toward the lifting platform 12. When the drive component 13 drives the lifting platform 12 to move downward, the top of the bottom anti-collision component 152 can abut against the lifting platform 12 to limit the maximum downward movement of the lifting platform 12 and prevent the lifting platform 12 from hitting the second bearing part 133.

[0070] Specifically, the top anti-collision assembly 151 includes a first component bracket 1511 and a first buffer pad 1512 disposed at the bottom of the first component bracket 1511. The top of the first component bracket 1511 is mounted to the top frame 111. For example, a screw can be used to mount the top of the first component bracket 1511 to the top frame 111. The first buffer pad 1512 may be made of rubber, which can absorb vibrations by deformation. When the drive assembly 13 drives the lifting platform 12 to move upward, the first buffer pad 1512 is the part of the top anti-collision assembly 151 used to abut against the lifting platform 12. Correspondingly, the bottom anti-collision assembly 152 includes a second component bracket 1521 and a second buffer pad 1522 disposed at the top of the second component bracket 1521. The bottom of the second component bracket 1521 is mounted to the flange cylinder 31. For example, a screw can be used to mount the bottom of the second component bracket 1521 to the flange cylinder 31. The second buffer pad 1522 may be made of rubber, which can absorb vibration by deformation. When the drive assembly 13 drives the lifting platform 12 to move downward, the second buffer pad 1522 is the part of the bottom anti-collision assembly 152 used to abut against the lifting platform 12.

[0071] In a specific example of the water velocity meter 100 of the present invention, there are three top anti-collision components 151, which are arranged at intervals. When the drive assembly 13 drives the lifting platform 12 upward to the position where the first buffer pads 1512 of these top anti-collision components 151 abut against the lifting platform 12, the lifting platform 12 can be evenly stressed in the circumferential direction, preventing the lifting platform 12 from tilting. Correspondingly, there are three bottom anti-collision components 152, which are arranged at intervals. When the drive assembly 13 drives the lifting platform 12 downward to the position where the second buffer pads 1522 of these bottom anti-collision components 152 abut against the lifting platform 12, the lifting platform 12 can be evenly stressed in the circumferential direction, preventing the lifting platform 12 from tilting.

[0072] Continue to refer to the appendix Figures 7 to 10 The dry-end unit 10 further includes a position detection unit 16, which includes a metal plate 161, a top position detection component 162, and a bottom position detection component 163. The metal plate 161 is mounted on the lifting platform 12. The top position detection component 162 includes a third component bracket 1621 and a first proximity switch 1622 mounted on the bottom of the third component bracket 1621. The top of the third component bracket 1621 is mounted on the top frame 111. The first proximity switch 1622 is connected to the first circuit board 14. When the driving component 13 drives the lifting platform 12 to move upward, the first proximity switch 1622 is used to detect the metal plate 161. When the first proximity switch 1622 detects the metal plate 161, it indicates that the lifting platform 12 has moved upward to the designed position. The first circuit board 14 controls the drive motor 131 to stop according to the signal sent by the first proximity switch 1622. The bottom position detection component 163 includes a fourth component bracket 1631 and a second proximity switch 1632 mounted on the fourth component bracket 1631. The bottom of the fourth component bracket 1631 is mounted on the top of the flange cylinder 31. The second proximity switch 1632 is connected to the first circuit board 14. When the drive component 13 drives the lifting platform 12 to move downward, the second proximity switch 1632 is used to detect the metal piece 161. When the second proximity switch 1632 detects the metal piece 161, it indicates that the lifting platform 12 has moved downward to the designed position. The first circuit board 14 controls the drive motor 131 to stop according to the signal sent by the first proximity switch 1622.

[0073] In the water velocity meter 100 of the present invention, a screw is used to install the metal plate 161 onto the lifting platform 12, a screw is used to install the top of the third component bracket 1621 onto the top frame 111, and a screw is used to install the bottom of the fourth component bracket 1631 onto the top of the flange cylinder 31.

[0074] Reference Appendix Figures 1 to 6 , Figure 22 , Figure 24 , Figure 27 and Figure 28 The dry-end unit 10 includes a chamber 17 and a cover 18. The bottom of the chamber 17 is mounted on the top of the flange cylinder 31, and the cover 18 is mounted on the top of the chamber 17. The water velocity meter 100 forms a watertight cavity 40 between the flange cylinder 31, the chamber 17, and the cover 18. The frame assembly 11, the lifting platform 12, the drive assembly 13, the first circuit board 14, the anti-collision part 15, and the position detection part 16 are located in the watertight cavity 40. Preferably, a sealing ring is provided between the chamber 17 and the cover 18 to increase the watertightness of the joint between the chamber 17 and the cover 18.

[0075] Reference Appendix Figure 2 , Figures 4 to 6 , Figure 27 and Figure 28 The hatch cover 18 has a first through hole 181. The dry end unit 10 includes a waterproof and breathable valve 19. The waterproof and breathable valve 19 includes a valve body 191 and a nut 192. The bottom of the valve body 191 passes through the first through hole 181 of the hatch cover 18. The nut 192 is screwed onto the end of the valve body 191 that passes through the hatch cover 18 to install the waterproof and breathable valve 19 onto the hatch cover 18. The valve body 191 communicates with the watertight cavity 40 and the external environment to balance the air pressure between the watertight cavity 40 and the external environment. Specifically, when the drive assembly 13 drives the lifting platform 12 to move upward, the valve body 191 of the waterproof and breathable valve 19 allows air in the watertight cavity 40 to be discharged to the external environment, preventing the formation of a high-pressure environment in the watertight cavity 40. When the drive assembly 13 drives the lifting platform 12 to move downward, the valve body 191 of the waterproof and breathable valve 19 allows air from the external environment to enter the watertight cavity 40, preventing the formation of a negative pressure environment in the watertight cavity 40.

[0076] Reference Appendix Figure 2 , Figures 4 to 6The hatch 18 has a second through-hole 182. The dry-end unit 10 includes a second circuit board 110 and at least one watertight plug 120. The second circuit board 110 is mounted on the bottom of the hatch 18 such that it is located in the watertight cavity 40, and is connected to the first circuit board 14. The watertight plug 120 is mounted on the hatch 18 such that its inner end is inserted into the second through-hole 182 of the hatch 18, and its inner end is connected to the second circuit board 110. The outer end of the watertight plug 120 can be used to connect a dual-purpose towing platform.

[0077] In a specific example of the water velocity meter 100 of the present invention, the number of the second perforations 182 of the hatch cover 18 is multiple, and correspondingly, the number of watertight plugs 120 is multiple, with the bottom of each watertight plug 120 being inserted into each of the second perforations 182 of the hatch cover 18. The types of each watertight plug 120 may be different to meet different functions.

[0078] The connection method between the second circuit board 110 and the first circuit board 14 is not limited in the water velocity meter 100 of the present invention. For example, in a specific example, the second circuit board 110 and the first circuit board 14 can be connected by a flexible flat cable.

[0079] Reference Appendix Figure 5 and Figure 6 The hatch cover 18 has a third through hole 183 and a fourth through hole 184. The dry-end unit 10 includes a first button 130 and a second button 140. The first button 130 is installed in the third through hole 183 of the hatch cover 18 and connected to the second circuit board 110. The second button 140 is installed in the fourth through hole 184 of the hatch cover 18 and connected to the second circuit board 110. The function of the first button 130 is to generate a descent signal. When the operator presses the first button 130, the drive assembly 13 drives the lifting platform 12 to descend, thereby switching the water velocity meter 100 from a retracted state to an extended state. The function of the second button 140 is to generate an ascent signal. When the operator presses the second button 140, the drive assembly 13 drives the lifting platform 12 to ascend, thereby switching the water velocity meter 100 from an extended state to a retracted state.

[0080] Preferably, the second circuit board 110 has a first plate hole 1101 and a second plate hole 1102. The first button 130 extends through the first plate hole 1101 of the second circuit board 110 to the back of the second circuit board 110 and is connected to the back of the second circuit board 110. The second button 140 extends through the second plate hole 1102 of the second circuit board 110 to the back of the second circuit board 110 and is connected to the back of the second circuit board 110. Optionally, in another example of the water velocity meter 100 of the present invention, the first button 130 can be connected to the first circuit board 14 after extending through the first plate hole 1101 of the second circuit board 110 to the back of the second circuit board 110, and the second button 140 can be connected to the first circuit board 14 after extending through the second plate hole 1102 of the second circuit board 110 to the back of the second circuit board 110.

[0081] Reference Appendix Figure 5 , Figure 6 and Figure 28 The hatch cover 18 has a fifth through hole 185. The dry-end unit 10 includes an indicator light 150, which includes a light-emitting element 1501 and a light guide post 1502. The light-emitting element 1501 is mounted on the second circuit board 110, and the light guide post 1502 is installed in the fifth through hole 185 of the hatch cover 18. The position of the light guide post 1502 corresponds to the position of the light-emitting element 1501 in the height direction. The light guide post 1502 is used to conduct the light generated by the light-emitting element 1501 to the outside for the operator to view. The operator can observe the working status of the water velocity meter 100 according to the illumination status of the light-emitting element 1501 of the indicator light 150.

[0082] Refer to Appendix 1 to Figure 4 , Figures 9 to 14 , Figure 23 and Figure 24 The wet end unit 20 includes an electronics compartment 21 and a wet end host 22. The wet end host 22 is installed at the bottom of the electronics compartment 21, and the top of the electronics compartment 21 is installed on the lifting platform 12 after passing through the flange cylinder 31.

[0083] Specifically, the electronic compartment 21 includes a compartment body 211, a heat dissipation bracket 212, at least one processing board 213, a bottom adapter 214, and a top adapter 215. The compartment body 211 has a cavity 2111. The processing board 213 is mounted on the heat dissipation bracket 212, and the processing board 213 has a first female connector 2131 at the bottom of the heat dissipation bracket 212 and a second female connector 2132 at the top of the heat dissipation bracket 212. The bottom adapter 214 has a first male connector 2141. After the first male connector 2141 is inserted into the first female connector 2131, a screw can be used to fix the bottom adapter 214 to the bottom of the heat dissipation bracket 212. The top adapter 215 has a... After the second male plug 2151 is inserted into the second female plug 2132, the screw can be used to fix the top adapter 215 to the top of the heat dissipation bracket 212. Thus, the heat dissipation bracket 212, the processing plate 213, the bottom adapter 214, and the top adapter 215 form a whole. The whole formed by the heat dissipation bracket 212, the processing plate 213, the bottom adapter 214, and the top adapter 215 is allowed to be inserted into the cavity 2111 through the top opening of the housing 211. The bottom adapter 214 closes the bottom opening of the housing 211, and the top adapter 215 closes the top opening of the housing 211, so that the cavity 2111 of the housing 211 forms a watertight environment.

[0084] Understandably, in order to further increase the water tightness of the joint between the bottom adapter 214 and the cabin 211, and to increase the water tightness of the joint between the top adapter 215 and the cabin 211, before the integrally formed by the heat dissipation bracket 212, the processing plate 213, the bottom adapter 214, and the top adapter 215 is installed on the cabin 211, at least one sealing ring is fitted on the bottom adapter 214 and the top adapter 215 respectively. This ensures that after the integrally formed by the heat dissipation bracket 212, the processing plate 213, the bottom adapter 214, and the top adapter 215 is installed on the cabin 211, the bottom adapter 214 reliably seals the bottom opening of the cabin 211, and the top adapter 215 reliably seals the top opening of the cabin 211.

[0085] The wet-end host 22 includes a host housing 221, a host circuit board 222, a plurality of transducers 223, and an adhesive portion 224. The host housing 221 has a cavity 2211 and a plurality of mounting slots 2212 respectively communicating with the cavity 2211. The host circuit board 222 is mounted on the host housing 221 and has a third female connector 2221. Each transducer 223 is respectively assembled into each of the mounting slots 2212 of the host housing 221 and is respectively connected to the host circuit board 222. The adhesive portion 224 is formed by curing adhesive injected into the cavity 2211 and the mounting slots 2212. The adhesive portion 224 covers each of the transducers 223 so that each of the transducers 223 is reliably assembled into each of the mounting slots 2212 of the host housing 221. Preferably, the adhesive portion 224 encapsulates a portion of the host circuit board 222.

[0086] The bottom adapter 214 also has a third male plug 2142. After the cavity 2211 of the main unit housing 221 is inserted into the bottom of the cabin 211 and the third male plug 2142 is inserted into the third female plug 2221, a set of screws can be used to lock the bottom of the cabin 211 and the main unit housing 221, thereby installing the wet end main unit 22 at the bottom of the electronic cabin 21.

[0087] In a specific example of the water velocity meter 100 of the present invention, the wet end unit 20 further includes a mounting ring 23, which is fitted into the insertion position of the chamber 211 and the main housing 221, and a set of screws can be used to lock the mounting ring 23, the main housing 221 and the chamber 211.

[0088] Understandably, in order to increase the watertightness of the joint between the electronic compartment 21 and the wet-end host 22, at least one sealing ring is fitted to the bottom of the compartment 211 before the bottom of the compartment 211 is inserted into the cavity 2211 of the host housing 221. Thus, after the bottom of the compartment 211 is inserted into the cavity 2211 of the host housing 221, the sealing ring is located between the compartment 211 and the host housing 221, and the sealing ring prevents gaps from forming between the compartment 211 and the host housing 221.

[0089] In a specific example of the water velocity meter 100 of the present invention, the main housing 221 has a plurality of first pin holes 2210, the bottom of the chamber 211 has a plurality of second pin holes 2110, and the wet end unit 20 includes a plurality of pins 24. When assembling the wet end main unit 22 and the electronic chamber 21, one end of each pin 24 can be inserted into the first pin hole 2210 of the main housing 221, and then the other end can be inserted into the second pin hole 2110 of the chamber 211. The pins 24 ensure that the third male plug 2142 of the bottom adapter 214 corresponds to the third female plug 2221 of the main circuit board 222 of the main housing 221, so that when the cavity 2211 of the main housing 221 is inserted into the bottom of the chamber 211, the third male plug 2142 of the bottom adapter 214 is inserted into the third female plug 2221 of the main circuit board 222.

[0090] In a specific example of the water velocity meter 100 of the present invention, the cross-sectional shape of the middle section of the main housing 221 is teardrop-shaped. The main housing 221 has a rounded bow side 2213 and a narrowed stern side 2214. The bow side 2213 and the stern side 2214 are located on opposite sides of the main housing 221. When the water velocity meter 100 in the extended state is moved by the dual-purpose towing platform, it is beneficial for the water velocity meter 100 to maintain stability in the water, optimize the pressure distribution on the surface of the main housing 221, reduce the probability of bubbles being precipitated due to pressure shearing, thereby preventing the sound waves emitted or received by the wet end main unit 22 from passing through both water and bubble media, thereby improving the measurement accuracy of the water velocity meter 100.

[0091] In one example of the water velocity meter 100 of the present invention, the main housing 221 has at least one water flow channel 2215 extending from the bow side 2213 to the stern side 2214. When the water velocity meter 100 in its extended state is moved on a dual-purpose towing platform, water flow is allowed through the water flow channel 2215 of the main housing 221, and the flow velocity of the water within the water flow channel 2215 of the main housing 221 is greater than the flow velocity outside the main housing 221. According to Bernoulli's equation, the pressure within the water flow channel 2215 of the main housing 221 is... The pressure is less than the pressure outside the main housing 221, resulting in a pressure difference between the inside and outside of the water flow channel 2215 of the main housing 221. Consequently, the entire circumferential direction outside the main housing 221 is subjected to water pressure from the surrounding environment. That is, the direction of the water pressure exerted by the surrounding environment on the main housing 221 is definite, and the pressure direction is all pointing towards the wet end main unit 22. Therefore, the back-and-forth oscillation of the wet end unit 20 caused by the unstable external water flow direction of the main housing 221 can be avoided. This is crucial for ensuring the measurement accuracy of the water velocity meter 100.

[0092] It is understood that, when the external water flow velocity of the main housing 221 remains constant, the faster the water flow velocity in the water flow channel 2215 of the main housing 221, the greater the pressure difference inside and outside the water flow channel 2215 of the main housing 221, and the greater the water pressure generated by the surrounding environment in the entire circumferential direction outside the main housing 221. Therefore, in order to increase the water flow velocity in the water flow channel 2215 of the main housing 221, in a specific example of the water velocity meter 100 of the present invention, the opening size of the water flow channel 2215 on the bow side 2213 is larger than the opening size on the stern side 2214.

[0093] Preferably, the main housing 221 has two water flow channels 2215, and the two water flow channels 2215 are arranged symmetrically.

[0094] Reference Appendix Figure 13 and Figure 16The main housing 221 has two switch holes 2216. The wet-end main unit 22 includes a water-touch switch 225. The water-touch switch 225 has a first electrode 2251 and a second electrode 2252. The top ends of the first electrode 2251 and the second electrode 2252 are respectively disposed on the main circuit board 222, and the bottom ends of the first electrode 2251 and the second electrode 2252 respectively extend to the outside through the two switch holes 2216 of the main housing 221. When the wet-end unit 20 is immersed in water, the water can conduct the first electrode 2251 and the second electrode 2252. When the wet-end unit 20 is emptied of water, the first electrode 2251 and the second electrode 2252 are disconnected. Therefore, whether the wet-end unit 20 is immersed in water can be determined by judging whether the first electrode 2251 and the second electrode 2252 are conductive.

[0095] After the wet-end unit 20 is immersed in water, in order to ensure that the first electrode 2251 and the second electrode 2252 can be conductive by the water, the distance between the first electrode 2251 and the second electrode 2252 can be controlled between 1mm and 5mm. The first electrode 2251 and the second electrode 2252 can be made of stainless steel, so that the first electrode 2251 and the second electrode 2252 not only have good conductivity, but also have higher strength.

[0096] Preferably, the top ends of the first electrode 2251 and the second electrode 2252 are respectively soldered to the main circuit board 222, and the bottom ends of the first electrode 2251 and the second electrode 2252 are located in a water flow channel 2215 of the main housing 221 to avoid direct collision between the first electrode 2251 and the second electrode 2252, thereby ensuring the reliability of the wet end main unit 22.

[0097] Reference Appendix Figure 12 , Figure 13 and Figure 22The bottom of the body 211 of the electronic compartment 21 has an insert cylinder 2112 and an overlapping step 2113. The insert cylinder 2112 is used to form the bottom opening of the body 211. The outer diameter of the insert cylinder 2112 is the same as the inner diameter of the cavity 2211 of the main unit housing 221. After the sealing ring is fitted onto the insert cylinder 2112 of the body 211, the insert cylinder 2112 is inserted into the cavity 2211 of the main unit housing 221. Then, the mounting ring 23 is fitted onto the insertion position of the insert cylinder 2112 of the body 211 and the main unit housing 221. Then, a set of screws is used to lock the mounting ring 23, the main unit housing 221 and the body 211, thereby increasing the water tightness of the joint position between the electronic compartment 21 and the wet end main unit 22.

[0098] The bottom adapter 214 includes a bottom adapter cylinder 2143, a bottom adapter circuit board assembly 2144, and a potting section 2145. The bottom adapter cylinder 2143 includes a bottom cylindrical body 21431 and a bottom abutment ring 21432 extending from the top of the bottom cylindrical body 21431 outwards. A set of screws can be used to lock the bottom abutment ring 21432 to the bottom of the heat sink bracket 212. The bottom adapter circuit board assembly 2144 is housed within the bottom cylindrical body 21431. The board assembly 2144 is provided with a first male plug 2141 and a third male plug 2142. The potting part 2145 is formed by the curing of glue poured into the bottom cylinder 21431. The potting part 2145 covers the part of the bottom adapter circuit board assembly 2144 other than the first male plug 2141 and the third male plug 2142, so that the bottom adapter circuit board assembly 2144 is reliably placed on the bottom cylinder 21431 by the potting part 2145 and the bottom cylinder 21431 is prevented from leaking water. The outer diameter of the bottom cylinder 21431 is the same as the inner diameter of the insert cylinder 2112 of the compartment 211. After the sealing ring is fitted onto the bottom cylinder 21431, the bottom cylinder 21431 is inserted into the insert cylinder 2112 of the compartment 211. The bottom abutment ring 21432 abuts against the abutment step 2113 of the compartment 211. In this way, the watertightness of the joint between the compartment 211 and the bottom adapter cylinder 2143 can be ensured. Preferably, a sealing ring can also be provided between the bottom abutment ring 21432 and the abutment step 2113.

[0099] It is understandable that, since the joint between the cabin 211 and the bottom adapter cylinder 2143 has good water tightness and the glue-filled part 2145 formed by glue inside the bottom cylinder 21431, even if water leaks at the joint between the wet end host 22 and the electronic cabin 21, the interior of the electronic cabin 21 remains watertight, thus ensuring the reliability of the electronic cabin 21.

[0100] Reference Appendix Figures 9 to 13 , Figure 23 The top adapter 215 includes a top adapter cylinder 2152 and a top adapter circuit board assembly 2153. The top adapter cylinder 2152 includes a top cylinder body 21521 and a top abutment ring 21522 extending from the top of the top cylinder body 21521 to the surrounding area. A set of screws can be used to lock the top cylinder body 21521 to the top of the heat dissipation bracket 212. The top adapter circuit board assembly 2153 is housed in the top adapter cylinder 2152, and the second male plug 2151 is disposed on the top adapter circuit board assembly 2153. The outer diameter of the top cylinder 21521 is the same as the inner diameter of the top of the compartment 211. After the sealing ring is fitted onto the top cylinder 21521, the top cylinder 21521 is inserted into the top opening of the compartment 211, and the top abutment ring 21522 rests against the top edge of the compartment 211. In this way, the water tightness of the joint between the compartment 211 and the top adapter cylinder 2152 can be guaranteed.

[0101] Screws are used to lock the top adapter cylinder 2152 of the top adapter portion 215 to the lifting platform 12, so that the wet end unit 20 can be drivably installed on the dry end unit 10. It is understood that the top adapter cylinder 2152 of the top adapter portion 215 is a stress concentration area of ​​the water velocity meter 100 of the present invention. To ensure the reliability of the connection between the top adapter cylinder 2152 of the top adapter portion 215 and the lifting platform 12, on the one hand, the top adapter cylinder 2152 of the top adapter portion 215 has high hardness and strength, improving its bending resistance; on the other hand, multiple screws are used to lock the top cylinder 21521 of the top adapter cylinder 2152 of the top adapter portion 215 and the top of the heat dissipation bracket 212 along the height direction.

[0102] Reference Appendix Figure 2 , Figure 4 , Figures 7 to 13 , Figure 20 and Figure 21The dry-end unit 10 includes a conductive section 160, which includes a mounting housing 1601, a conductive circuit board 1602, and a spiral cable 1603. The bottom ends of the conductive circuit board 1602 and the spiral cable 1603 are mounted on the mounting housing 1601, and the bottom end of the spiral cable 1603 is connected to the conductive circuit board 1602. The conductive circuit board 1602 has a fourth male connector 16021, and the top end of the spiral cable 1603 is connected to the first circuit board 14. The lifting platform 12 has a central through hole 123, and the top of the top adapter 215 extends into the central through hole 123 of the lifting platform 12. The top adapter 215 has a fourth female connector 2154, which is disposed on the top adapter circuit board assembly 2153. The fourth male connector 16021 of the conductive circuit board 1602 is inserted into the fourth female connector 2154 of the top adapter 215 to connect the dry-end unit 10 and the wet-end unit 20. When the drive assembly 13 drives the lifting platform 12 and the wet-end unit 20 to rise and fall, the spiral cable 1603 can deform to prevent the fourth male connector 16021 from falling off the fourth female connector 2154.

[0103] Appendix Figures 18 to 22 A test fixture 200 according to a preferred embodiment of the present invention is shown. The test fixture 200 is used to test the pressure resistance performance of the water velocity meter 100. The test fixture 200 includes a pressure chamber 210, a pressurizing pump 220, and a solenoid valve 230. The pressure chamber 210 has a pressure holding chamber 2101 and a hatch 2102, a water inlet 2103, and a drain 2104 respectively connected to the pressure holding chamber 2101. The pressurizing pump 220 is installed in the water inlet 2103 of the pressure chamber 210 to inject water into the pressure holding chamber 2101 of the pressure chamber 210 and pressurize the water in the pressure holding chamber 2101. The solenoid valve 230 is installed in the drain 2104 of the pressure chamber 210 to allow the water in the pressure holding chamber 2101 of the pressure chamber 210 to be discharged.

[0104] When testing the pressure resistance of the water velocity meter 100, the flange cylinder 31 of the flange unit 30 of the water velocity meter 100 is installed in the pressure chamber 210, and the wet end unit 20 can extend into the pressure holding chamber 2101 through the hatch 2102 of the pressure chamber 210. After the flange cylinder 31 is installed in the pressure chamber 210, the pressurization pump 220 operates to pressurize the water pressure in the pressure holding chamber 2101 of the pressure chamber 210 to a preset value. During the process of the wet end unit 20 being raised and lowered by the drive assembly 13 of the dry end unit 10 of the water velocity meter 100, water is selectively allowed to enter through the water inlet 2103 or drain through the drain 2104 of the pressure chamber 210, so that the water pressure in the pressure holding chamber 2101 of the pressure chamber 210 remains stable, thereby testing the pressure resistance of the water velocity meter 100 during the raising and lowering process of the wet end unit 20 under constant water pressure.

[0105] Specifically, when the drive assembly 13 of the dry end unit 10 drives the wet end unit 20 to rise, the pressurization pump 220 is controlled to inject water into the pressure-holding chamber 2101 through the water inlet 2103 to prevent the water pressure in the pressure-holding chamber 2101 from decreasing. When the drive assembly 13 of the dry end unit 10 drives the wet end unit 20 to rise, the solenoid valve 230 is controlled to switch to the open state to allow the water in the pressure-holding chamber 2101 of the pressure chamber 210 to be discharged through the drain hole 2104 to prevent the water pressure in the pressure-holding chamber 2101 from increasing. In this way, the water pressure in the pressure-holding chamber 2101 of the pressure chamber 210 can be kept stable.

[0106] During the lifting and lowering of the wet end unit 20 of the water velocity meter 100, in order to automatically control the water pressure in the pressure holding chamber 2101 of the pressure chamber 210, the test fixture 200 further includes a controller 240. The pressurizing pump 220 and the solenoid valve 230 are respectively controllably connected to the controller 240. The second circuit board 110 of the dry end unit 10 of the water velocity meter 100 can also be connected to the controller 240. When the tester presses the first button 130, causing the drive component 13 of the dry end unit 10 to drive the wet end unit 20 to descend, the controller 240 controls the solenoid valve 230 to switch to the open state, so as to discharge the water in the pressure holding chamber 2101 through the drain hole 2104, thereby preventing the water pressure in the pressure holding chamber 2101 from rising. When the tester presses the second button 140, causing the drive component 13 of the dry end unit 10 to drive the wet end unit 20 to rise, the controller 240 controls the pressurization pump 220 to work, so as to inject water into the pressure holding chamber 2101 through the water inlet hole 2103, thereby preventing the water pressure in the pressure holding chamber 2101 from decreasing.

[0107] Furthermore, the pressure chamber 210 has a pressure gauge interface 2105, and the test fixture 200 includes a pressure gauge 250. The pressure gauge 250 is installed in the pressure gauge interface 2105 of the pressure chamber 210 to measure the water pressure in the pressure-holding chamber 2101 of the pressure chamber 210. The pressure gauge 250 is connected to the controller 240. When the drive assembly 13 of the dry-end unit 10 drives the wet-end unit 20 to rise and fall, the controller 240 controls the working state of the pressurizing pump 220 and the solenoid valve 230 according to the measurement result of the pressure gauge 250. In a specific example of the present invention, the controller 240 controls both the pressurizing pump 220 and the solenoid valve 230 to be in a stopped state, and the measurement result of the pressure gauge 250 can be used to determine whether the wet-end unit 20 is leaking water. It is understood that since both the pressurizing pump 220 and the solenoid valve 230 are in a stopped state, no water enters the water inlet 2103 of the pressure chamber 210 and no water drains from the drain hole 2104. In this case, if the pressure gauge 250 indicates that the water pressure in the pressure-holding chamber 2101 of the pressure chamber 210 has decreased, it means that the wet-end unit 20 is leaking. If the pressure gauge 250 indicates that the water pressure in the pressure-holding chamber 2101 of the pressure chamber 210 remains unchanged, it means that the wet-end unit 20 is not taking in water. Optionally, in other examples of the present invention, a pressure sensor or a humidity sensor can be installed inside the main housing 221 of the wet-end host 22 of the wet-end unit 20 of the water velocity meter 100. The measurement results of the pressure sensor or humidity sensor can be used to determine whether the wet-end unit 20 is leaking.

[0108] In a specific example of the present invention, the driving component 13 of the dry end unit 10 can drive the wet end unit 20 to rise and fall rapidly, thereby testing the dynamic pressure fluctuation resistance of the water velocity meter 100.

[0109] Reference Appendix Figures 15 to 18 The pressure chamber 210 further includes a main body 2106 and a cover 2107. The cover 2107 is installed on the main body 2106 to form the pressure-holding cavity 2101 of the pressure chamber 210 between the main body 2106 and the cover 2107. The hatch 2102 is provided on the cover 2107. The water inlet 2103, the drain hole 2104 and the pressure gauge interface 2105 are all provided on the main body 2106.

[0110] In a specific example of the test fixture 200 of the present invention, a set of screws can be used to install the hatch cover 2107 onto the hatch body 2106. A sealing ring is provided between the hatch body 2106 and the hatch cover 2107 to prevent water leakage at the joint between the hatch body 2106 and the hatch cover 2107.

[0111] The hatch cover 2107 has a support column 21071, which is used to install the flange cylinder 31 so as to install the water velocity meter 100 on the test fixture 200. The hatch cover 2107 has an ear 21072 on each of its opposite sides to facilitate the movement of the test fixture 200.

[0112] The bottom of the main body 2106 of the chamber has an annular bottom edge 21061, which facilitates the fixation of the pressure chamber 210 when testing the pressure resistance performance of the water velocity meter 100. Additionally, the annular bottom edge 21061 of the main body 2106 can be fixed to a vibration platform to connect the vibration platform and the water velocity meter 100, thereby enabling the testing of the vibration resistance performance of the water velocity meter 100.

[0113] According to another aspect of the present invention, the present invention also provides a method for testing the pressure resistance performance of the water velocity meter 100, wherein the test method includes the following: S1, the flange cylinder 31 of the water velocity meter 100 is installed in the pressure chamber 210 by means of the wet end unit 20 of the water velocity meter 100 extending into the pressure holding chamber 2101 through the hatch 2102 of the pressure chamber 210. S2, pressurize the water pressure in the pressure-holding chamber 2101 of the pressure chamber 210 to a preset value; S3, during the process of the dry end unit 10 driving the wet end unit 20 to rise and fall, water is selectively allowed to enter through the water inlet 2103 or drain through the drain hole 2104 of the pressure chamber 210, so as to keep the water pressure in the pressure holding chamber 2101 of the pressure chamber 210 stable.

[0114] 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 method for testing the pressure resistance performance of a water velocity meter, characterized in that, The testing methods include the following: S1, the flange cylinder of the flange unit of the water velocity meter is installed in the pressure chamber by extending the wet end unit of the water velocity meter into the pressure chamber through the hatch of the pressure chamber. S2, pressurize the water pressure in the pressure-holding chamber of the pressure chamber to a preset value; S3, during the process of the dry end unit of the water velocity meter driving the wet end unit to rise and fall, selectively allowing water to enter through the water inlet or drain through the water outlet of the pressure chamber, so as to keep the water pressure in the pressure holding chamber of the pressure chamber stable. The flange sleeve is fitted onto the wet end unit and installed at the bottom of the dry end unit. The inner wall of the flange sleeve is provided with a first fitting groove, a second fitting groove, and a third fitting groove. The flange unit includes a first dustproof sealing ring, an oil seal ring, and a second dustproof sealing ring. The outer side of the first dustproof sealing ring is embedded in the first fitting groove of the flange sleeve, and the inner side of the first dustproof sealing ring binds the top of the wet end unit. The outer side of the oil seal ring is embedded in the second fitting groove of the flange sleeve, and the inner side of the oil seal ring binds the wet end unit. The outer side of the second dustproof sealing ring is embedded in the third fitting groove of the flange sleeve, and the inner side of the second dustproof sealing ring binds the wet end unit. The first dustproof sealing ring, the oil seal ring, and the second dustproof sealing ring cooperate with each other, allowing the dry end unit to drive the wet end unit to reciprocate relative to the flange sleeve.

2. The test method according to claim 1, wherein in step S3, when the dry end unit drives the wet end unit to rise, the controller controls the pressurization pump installed in the water inlet of the pressure chamber to inject water into the pressure holding chamber through the water inlet; when the dry end unit drives the wet end unit to descend, the controller controls the solenoid valve of the drain hole installed in the pressure chamber to switch to the open state, so as to allow the water in the pressure holding chamber to be discharged through the drain hole of the pressure chamber.

3. The test method according to claim 2, wherein in step S2, the water pressure in the pressure-holding chamber of the pressure chamber is measured by a pressure gauge installed in the pressure gauge interface of the pressure chamber, and thus in step S3, the controller controls the working state of the pressurizing pump and the solenoid valve according to the measurement result of the pressure gauge.

4. The test method according to claim 3, wherein in step S3, when the water inlet of the pressure chamber is not filled with water and the drain hole is not drained, the wet end unit is judged to be leaking water based on the measurement result of the pressure gauge.

5. The test method according to claim 3, wherein in step S3, when the water inlet of the pressure chamber is not filled with water and the drain hole is not drained, the wet end unit is judged to be leaking water based on the measurement result of the pressure sensor inside the wet end unit.

6. The test method according to claim 3, wherein in step S3, when the water inlet of the pressure chamber is not filled with water and the drain hole is not drained, the wet end unit is judged to be leaking water based on the measurement result of the humidity sensor inside the wet end unit.

7. The test method according to any one of claims 1 to 6, wherein in step S3, the dry end unit is allowed to drive the wet end unit to rise and fall rapidly to test the dynamic pressure fluctuation resistance performance of the water velocity meter.

8. The test method according to any one of claims 1 to 6, wherein in step S3, during the process of the dry end unit driving the wet end unit to rise and fall, the waterproof and breathable valve of the dry end unit is allowed to enter or exit air to balance the internal and external air pressure of the watertight cavity of the dry end unit.

9. A testing fixture, characterized in that, The test apparatus is used to test the pressure resistance performance of the water velocity meter using the test method described in claim 1. The test apparatus includes a pressurizing pump, a solenoid valve, and a pressure chamber. The pressure chamber includes a pressure-holding cavity and a hatch, a water inlet, and a drain hole respectively connected to the pressure-holding cavity. The pressurizing pump is installed at the water inlet of the pressure chamber, and the solenoid valve is installed at the drain hole of the pressure chamber. After the flange of the water velocity meter is installed in the pressure chamber, the wet end unit of the water velocity meter can extend into the pressure-holding cavity through the hatch of the pressure chamber.

10. The test fixture according to claim 9, wherein the test fixture includes a pressure gauge, the pressure chamber has a pressure gauge interface, the pressure gauge interface is connected to the pressure holding chamber, and the pressure gauge is installed on the pressure gauge interface.

Images