A pressure measurement fixing structure for a water turbine model test

Abstract

This utility model discloses a pressure measurement fixing structure for a turbine model test, belonging to the field of turbine technology. The lower end of a sensor sleeve is threadedly connected to a sensor seat. A sensor is installed inside the sensor seat, and an adjusting ring is provided outside the sensor seat. A rubber pad is fitted onto the sensor seat, positioned between the adjusting ring and the bottom of the mounting hole. A sensor cap is threaded into the mounting hole, and the sensor cap drives the sensor sleeve to move in a specific direction. The sensor sleeve of this application can be customized in length to adapt to different measuring points, and can be disassembled and assembled as a whole with external tools, solving the problem of difficult traditional disassembly and assembly. The sensor seat firmly fixes the sensor, and combined with the elastic deformation of the rubber pad and the adjustment of the sensor cap, accurately aligns the sensor with the flow channel surface, reducing measurement errors. The plug can easily replace the sensor or sensor seat, ensuring a smooth flow channel after sealing, without affecting other tests. The overall structure is simple, occupies little space, and is highly adaptable, providing accurate data support for turbine model tests.

Description

Technical Field

[0001] This utility model belongs to the field of water turbine technology, and in particular to a fixed structure for pressure measurement in water turbine model testing. Background Technology

[0002] Guided by the similarity theory of hydraulic turbines, model testing of hydraulic turbines plays a crucial role in their application and development. Furthermore, pressure testing of the hydraulic turbine model serves as a primary method for pressure reference of the actual turbine unit. Existing methods for fixing pressure measuring equipment primarily involve directly mounting it to the hydraulic turbine model. However, this method has several drawbacks. First, it fails to accurately align the pressure measuring device's sensor with the flow channel measurement position, leading to measurement errors and affecting the performance evaluation of the actual turbine. Second, the small size and complex structure of the model make disassembly and assembly of some measuring devices difficult. Therefore, it is essential to invent a pressure measuring fixing structure for hydraulic turbine model testing without affecting structural movement. Utility Model Content

[0003] The purpose of this utility model is to provide a pressure measurement fixing structure for a water turbine model test, comprising: a sensor sleeve, the lower end of which is threadedly connected to a sensor seat, a sensor installed inside the sensor seat, an adjusting ring provided outside the sensor seat, a rubber pad fitted on the sensor seat, the rubber pad being placed between the adjusting ring and the bottom of the mounting hole, a sensor cover threaded into the mounting hole, and the sensor cover driving the sensor sleeve to move in a specific direction.

[0004] Furthermore, the upper end of the sensor cover is provided with a drive unit to drive its rotation.

[0005] Furthermore, the sensor cover is a hollow tubular structure.

[0006] Furthermore, the outer wall of the sensor sleeve is provided with a drive shaft shoulder that mates with the lower end of the sensor cover.

[0007] Furthermore, a drive ring is provided on the inner wall of the sensor cover, and the drive ring is driven by cooperating with the upper end of the sensor sleeve or by cooperating with the drive shaft shoulder provided on the outer wall of the sensor sleeve.

[0008] Furthermore, the inner wall of the sensor sleeve is provided with an extraction part that can be used with external tools to remove the sensor.

[0009] Furthermore, the extraction part has an internal thread.

[0010] Furthermore, the end of the external tool is provided with an external thread that mates with the extraction part.

[0011] Furthermore, the external tool has a notch on its external thread to protect the sensor connection wires.

[0012] Furthermore, it also includes replacing the plug at the location of the sensor or replacing the plug at the location of the sensor mount.

[0013] Beneficial effects:

[0014] The sensor sleeve in this application can be customized in length to adapt to different measuring points, and can be disassembled and assembled as a whole with the help of external tools, solving the problem of difficult disassembly and assembly in traditional methods; the sensor seat firmly fixes the sensor, and the combination of the elastic deformation of the rubber pad and the adjustment of the sensor cover ensures precise alignment of the sensor and the flow channel surface, reducing measurement errors; the plug can easily replace the sensor or sensor seat, ensuring that the flow channel is flat after sealing and does not affect other tests; the overall structure is simple, occupies little space, and has strong adaptability, providing accurate data support for turbine model tests. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the position of the drive ring of this utility model;

[0017] Figure 3 This is a schematic diagram of the drive shaft shoulder position of this utility model;

[0018] Figure 4 This is a schematic diagram of the plug installation position of this utility model;

[0019] Figure 5 This is a schematic diagram of the second installation position of the plug in this utility model.

[0020] The attached figures are labeled as follows: sensor sleeve 1, sensor base 2, sensor 3, adjusting ring 4, rubber pad 5, mounting hole 6, sensor cover 7, drive unit 71, drive ring 72, external tool 8, notch 81, plug 9, drive shaft shoulder 11, and extraction unit 12. Detailed Implementation

[0021] In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention can be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described in order to avoid confusion with the present invention.

[0022] A pressure measurement fixing structure for a turbine model test includes: a sensor sleeve 1, the lower end of which is threadedly connected to a sensor base 2; a sensor 3 installed inside the sensor base 2; an adjusting ring 4 disposed outside the sensor base 2; a rubber pad 5 fitted onto the sensor base 2; the rubber pad 5 positioned between the adjusting ring 4 and the bottom of a mounting hole 6; a sensor cover 7 threadedly fitted into the mounting hole 6; and the sensor cover 7 driving the sensor sleeve 1 to move in a specific direction. A driving part 71 for rotating the sensor cover 7 is disposed at its upper end. The sensor cover 7 is a hollow tubular structure. A driving shoulder 11 that engages with the lower end of the sensor cover 7 is disposed on the outer wall of the sensor sleeve 1. A driving ring 72 is disposed on the inner wall of the sensor cover 7, which engages with the upper end of the sensor sleeve 1 or with the driving shoulder 11 on the outer wall of the sensor sleeve 1. A extraction part 12 for removal by an external tool 8 is disposed on the inner wall of the sensor sleeve 1. The extraction part 12 is internally threaded. The external tool 8 has an external thread at its end that mates with the extraction part 12. The external thread of the external tool 8 has a notch 81 for protecting the connecting wires of the sensor 3. It also includes a plug 9 for replacing the location of the sensor 3 or a plug 9 for replacing the location of the sensor seat 2.

[0023] The sensor sleeve 1, as the core load-bearing component of the entire fixed structure, plays an irreplaceable role in structural assembly, force transmission, disassembly and assembly guidance, and adaptation to different test scenarios. Its main body is a tubular structure, which, through precise structural design, becomes a key hub connecting various components. The lower end of the sensor sleeve 1 is connected to the sensor base 2 via a threaded connection. This connection structure ensures the stability of the connection between the sensor base 2 and the sensor sleeve 1, effectively preventing loosening caused by water flow impact, equipment vibration, and other factors during the test, providing a stable installation foundation for the sensor 3. The threaded connection also facilitates disassembly, making it easy to inspect, calibrate, or replace the sensor 3 later, solving the problem of difficult disassembly and maintenance of sensors in traditional fixed structures.

[0024] The drive shoulder 11 on the outer wall of the sensor sleeve 1 is a crucial design feature for achieving structural position adjustment. The drive shoulder 11 engages with the lower end of the sensor cover 7 or the drive ring 72 on its inner wall. When the sensor cover 7 is rotated, it undergoes axial displacement through its threaded engagement with the mounting hole 6, which in turn propels the sensor sleeve 1 to move in a specific direction via the drive shoulder 11. This force transmission structure is precise and stable, ensuring that the sensor sleeve 1 smoothly adjusts the position of the sensor base 2 and the sensor 3. This provides reliable structural support for aligning the sensor 3 with the flow channel measurement position, effectively reducing measurement errors caused by installation position deviations.

[0025] The extraction part 12 on the inner wall is a core design feature of the sensor sleeve 1 for ease of disassembly. Specifically, the extraction part 12 has an internal thread structure that precisely engages with the external thread at the end of the external tool 8. During disassembly, simply tighten the external thread of the external tool 8 with the internal thread of the extraction part 12, and apply pulling force through the external tool 8 to remove the sensor sleeve 1, sensor base 2, sensor 3, and other components as a whole from the mounting hole 6. This overall disassembly design avoids the tedious process of disassembling each component individually, as is common in traditional fixed structures. It is particularly suitable for small-sized and complex water turbine model machines, greatly improving disassembly efficiency and reducing the risk of damage to the equipment during assembly and disassembly.

[0026] Furthermore, the sensor sleeve 1 can be manufactured in different lengths according to the test requirements, such as the thickness of the object under test and the depth of the measuring point. This customizable design enables the pressure measuring fixture to adapt to various models of water turbines with different structural parameters, significantly improving the versatility and applicability of the structure and overcoming the limitations of traditional fixtures, which have poor adaptability and can only be used for specific models.

[0027] The sensor mount 2 is a core component specifically designed for installing and securing the sensor 3. Its structural design directly affects the installation stability, measurement accuracy, and ease of subsequent maintenance of the sensor 3.

[0028] The internal structure of sensor holder 2 is compatible with sensor 3, providing precise enclosure and fixation to prevent displacement or shaking of sensor 3 during testing due to water flow impact, equipment vibration, or other factors. This stable installation method ensures that sensor 3 remains in the preset measurement position, providing a fundamental guarantee for accurate pressure data acquisition. Simultaneously, sensor holder 2 effectively protects sensor 3, reducing the erosion and damage caused by direct water flow impact, extending the service life of sensor 3, and lowering testing costs.

[0029] The adjusting ring 4, located outside the sensor base 2, engages with the rubber pad 5, providing auxiliary positioning and cushioning during structural installation and position adjustment. The adjusting ring 4 limits the rubber pad 5, ensuring it remains in the preset position between the adjusting ring 4 and the bottom of the mounting hole 6, preventing displacement of the rubber pad 5 under pressure and thus affecting cushioning and sealing. Simultaneously, the engagement structure between the adjusting ring 4 and the sensor base 2 further enhances the installation stability of the sensor base 2 within the sensor sleeve 1, reducing the impact of vibration on the measurement accuracy of the sensor 3.

[0030] Furthermore, sensor holder 2 boasts excellent compatibility and replaceability. When it is necessary to block the measurement point, sensor holder 2 and sensor 3 can be removed together and replaced with plug 9 without any modifications to other structures. This design creates a replaceable modular structure between sensor holder 2 and plug 9, simplifying the measurement point blocking process, ensuring the flatness of the flow channel surface after blocking, and preventing improper blocking from affecting the acquisition of other experimental data.

[0031] The rubber pad 5, as a sealing and buffering element in the structure, plays a crucial role in ensuring test stability, sealing performance, and improving adjustment accuracy, despite its simple structure.

[0032] A rubber pad 5 is placed between the adjusting ring 4 and the bottom of the mounting hole 6. During the tightening of the sensor cover 7, the sensor cover 7 generates axial pressure by driving the sensor sleeve 1. This pressure is transmitted to the rubber pad 5 through the adjusting ring 4, causing the rubber pad 5 to undergo elastic deformation. The elastic deformation characteristics of the rubber pad 5 provide the possibility for fine-tuning the position of the sensor 3: by adjusting the screwing depth of the sensor cover 7, the deformation of the rubber pad 5 can be precisely controlled, thereby driving the sensor sleeve 1, sensor seat 2, and sensor 3 to make minor position adjustments, ultimately achieving precise flush alignment between the sensor 3 and the flow channel hole surface of the measured body. This fine-tuning method based on elastic deformation solves the problem that traditional fixed structures cannot accurately adjust the sensor position, effectively reducing measurement errors caused by installation position deviations and improving the accuracy of pressure measurement.

[0033] In terms of sealing performance, the rubber gasket 5 can fit tightly against the contact surface between the adjusting ring 4 and the bottom of the mounting hole 6 after deformation, forming an effective sealing structure to prevent water from leaking from the gap between the mounting hole 6 and each component during the test.

[0034] In addition, the rubber pad 5 also has a good buffering and shock absorption effect. During the turbine model test, the water flow impact and equipment operation will generate a certain amount of vibration. These vibrations will be transmitted to the sensor 3 through the structure, affecting the measurement stability of the sensor 3, and may even cause damage to the sensor 3.

[0035] The sensor cover 7 is the core operating component for structural fixation, position adjustment, and disassembly guidance. Its structural design fully considers ease of operation, adjustment accuracy, and connection stability.

[0036] The sensor cover 7 has a hollow tubular structure. This design ensures that the connecting wires of the sensor 3 can pass through smoothly, avoiding compression, tangling, or damage to the wires, while also reducing the weight of the component and facilitating installation and disassembly. The hollow tubular structure also provides sufficient space for the axial movement of the sensor sleeve 1, ensuring smooth adjustment of the structure.

[0037] The drive unit 71 located at the upper end of the sensor cover 7 is a key design feature that facilitates the operator's rotation of the cover. The drive unit 71 can be designed as a hexagon, a square, or a structure with anti-slip texture, making it easy to operate with common tools such as wrenches and screwdrivers, thus reducing the difficulty of operation.

[0038] The drive ring 72, located on the inner wall of the sensor cover 7, is a crucial structure for force transmission. The drive ring 72 can directly engage with the upper end of the sensor sleeve 1 for drive, or engage with the drive shoulder 11 on the outer wall of the sensor sleeve 1 for drive. When the sensor cover 7 rotates and moves axially along the mounting hole 6, the drive ring 72 applies an axial force through its mating surface with the sensor sleeve 1, pushing the sensor sleeve 1 to move in a specific direction. This precise force transmission structure design ensures uniform force distribution, preventing the sensor sleeve 1 from tilting or jamming during movement, and guaranteeing the smoothness and accuracy of the sensor 3's position adjustment.

[0039] Meanwhile, the threaded engagement between the sensor cap 7 and the mounting hole 6 provides excellent self-locking performance. When the sensor 3 is adjusted to the preset position, the friction generated by the threaded engagement keeps the sensor cap 7 in its current position, achieving structural fixation without the need for additional locking components. This prevents the sensor cap 7 from loosening due to vibration or other factors during testing, ensuring the stability of the sensor 3's installation position. This self-locking structure not only simplifies the structural design but also improves its reliability, avoiding measurement errors or equipment damage caused by the failure of additional locking components.

[0040] External tool 8 is a disassembly auxiliary component specifically designed for this pressure measurement and fixing structure. Its structural design is highly targeted and effectively solves the problem of difficult disassembly of traditional fixing structures.

[0041] The external thread at the end of the external tool 8 precisely engages with the extraction part 12 on the inner wall of the sensor sleeve 1, ensuring strong connection between the external tool 8 and the sensor sleeve 1. During disassembly, simply screw the external thread of the external tool 8 into the internal thread extraction part 12 of the sensor sleeve 1. Axial tension can then be applied through the external tool 8 to remove the sensor sleeve 1, sensor base 2, sensor 3, and other components as a whole from the mounting hole 6. This overall disassembly method avoids the tedious process of disassembling each component individually, greatly improving disassembly efficiency. It is particularly suitable for scenarios with complex structures and limited installation space in water turbine model machines, reducing the risk of damage to the equipment during disassembly and assembly.

[0042] The notch 81 on the external thread of the external tool 8 is a protective design for the connecting wires of the sensor 3. During disassembly, the connecting wires of the sensor 3 need to pass through the gap between the external tool 8 and the sensor sleeve 1. The notch 81 provides dedicated clearance for the wires, preventing them from being squeezed, entangled, or cut by the threaded structure of the external tool 8 and the sensor sleeve 1. This effectively protects the connecting wires of the sensor 3 and prevents sensor 3 from failing due to wire damage. This user-friendly protective design improves the safety and reliability of the disassembly process and extends the service life of the sensor 3.

[0043] The plug 9 is a key component for sealing the measuring point. Its structural design ensures the flatness of the flow channel surface after sealing, avoiding any impact on the acquisition of subsequent test data.

[0044] The plug 9 can be replaced with the sensor 3 or the sensor base 2 as needed, forming a modular replacement structure. This replaceable design makes the measurement point plugging operation extremely simple: after the pressure measurement of a measurement point is completed, simply remove the sensor 3 and sensor base 2 together, insert the plug 9 into the sensor sleeve 1 or mounting hole 6 in the original installation order and tighten it to complete the measurement point plugging. No other structural modifications are required, avoiding the cumbersome process of re-processing the plugging parts or modifying the mounting holes in traditional plugging methods, thus improving testing efficiency.

[0045] The plug 9 is structurally compatible with the sensor base 2 or sensor 3, and after installation, it remains flush with the flow channel surface, ensuring smooth flow within the channel and preventing water flow turbulence caused by protruding or recessed plugs, which could affect pressure measurement data at other measuring points or the operating status of the turbine model. This flat plug design ensures the accuracy and continuity of experimental data, providing a guarantee for the smooth conduct of subsequent experiments.

[0046] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various equivalent transformations can be made to the technical solutions of the present invention, and all such equivalent transformations fall within the protection scope of the present invention.

Claims

1. A pressure measurement fixing structure for a water turbine model test, characterized in that, include: A sensor sleeve (1) is threadedly connected to a sensor base (2) at its lower end. A sensor (3) is installed inside the sensor base (2). An adjustment ring (4) is provided outside the sensor base (2). A rubber pad (5) is fitted on the sensor base (2). The rubber pad (5) is placed between the adjustment ring (4) and the bottom of the mounting hole (6). A sensor cover (7) is threaded inside the mounting hole (6). The sensor cover (7) drives the sensor sleeve (1) to move in a specific direction.

2. The pressure measurement fixing structure for turbine model testing according to claim 1, characterized in that, The upper end of the sensor cover (7) is provided with a drive unit (71) for driving its rotation.

3. The pressure measurement fixing structure for turbine model testing according to claim 1, characterized in that, The sensor cover (7) is a hollow tubular structure.

4. The pressure measurement fixing structure for turbine model testing according to claim 1, characterized in that, The outer wall of the sensor sleeve (1) is provided with a drive shaft shoulder (11) that cooperates with the lower end of the sensor cover (7).

5. The pressure measurement fixing structure for turbine model testing according to claim 1, characterized in that, The inner wall of the sensor cover (7) is provided with a drive ring (72), which is driven by the upper end of the sensor sleeve (1) or by the drive shaft shoulder (11) provided on the outer wall of the sensor sleeve (1).

6. The pressure measurement fixing structure for turbine model testing according to claim 1, characterized in that, The inner wall of the sensor sleeve (1) is provided with an extraction part (12) that cooperates with an external tool (8) to remove the sensor.

7. The pressure measurement fixing structure for turbine model testing according to claim 6, characterized in that, The extraction part (12) has an internal thread.

8. The pressure measurement fixing structure for turbine model testing according to claim 7, characterized in that, The end of the external tool (8) is provided with an external thread that mates with the extraction part (12).

9. The pressure measurement fixing structure for turbine model testing according to claim 8, characterized in that, The external tool (8) has a notch (81) on its external thread for protecting the connecting wire of the sensor (3).

10. The pressure measurement fixing structure for turbine model testing according to claim 1, characterized in that, It also includes a plug (9) that replaces the location of the sensor (3) or a plug (9) that replaces the location of the sensor seat (2).

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