A flow resistance testing device

Abstract

The application relates to the technical field of fluid mechanics test equipment, and discloses a flow resistance test device which comprises a box body, the inside of the box body is provided with a length adjusting assembly, the inside of the box body is sequentially fixedly connected with a fixed block and a supporting seat from left to right, one side of the fixed block close to the supporting seat is fixedly connected with a fixing seat, circular rods are uniformly fixedly connected between the fixed block and the supporting seat, a moving seat is slidably connected to the outer wall of the circular rod, inner cavities are arranged in the fixed block and the moving seat, a water tank is fixedly connected to the inside of the box body, a first water pump is arranged in the inside of the water tank, a water inlet pipe is fixedly connected to the output end of the first water pump, and a butt joint hose is arranged in the inside of the inner cavities. Through cooperation of the bolt, the gasket, the first pressing gasket, the second pressing gasket and the spring, the butt joint part can be quickly sealed, the test preparation efficiency is improved, and the flow velocity test efficiency is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of fluid dynamics testing equipment technology, specifically a flow resistance testing device. Background Technology

[0002] In fluid mechanics testing, flow resistance testing equipment is an essential tool. It is mainly used to test fluid passage components such as pipes, valves, and irregularly shaped parts. By recreating the fluid environment when the component is actually working, the fluid pressure drop and corresponding flow rate at the inlet and outlet of the component are measured, and then the flow resistance data is calculated. These data are the core basis for component design improvement, performance verification, and quality control.

[0003] Currently available flow resistance testing devices generally consist of a liquid storage unit, a liquid delivery power unit, a pressure detection unit, and a support frame. During operation, a water pump typically pumps the fluid from the storage tank into the test pipeline. After the fluid flow stabilizes, a pressure sensor measures the pressure difference between the inlet and outlet of the test piece, and the resistance is calculated based on the flow rate parameters. The tested fluid is either directly discharged or simply filtered before being recycled. For test pieces of different specifications, manual replacement of bushings and adjustment of bolts are required for compatibility. However, in industrial applications involving batch testing of components, such as aviation hydraulic pipelines and precision instrument fluid channels, where high-precision data is required, the aforementioned devices have certain shortcomings. From an adaptability perspective, batch testing often involves continuously testing pipe fittings of different specifications. Existing devices require manual replacement of the appropriate bushings and repeated adjustments of the clamping distance after shutdown. This process not only disrupts the continuity of the testing process but also easily leads to misalignment of the test pieces due to operational differences, such as the pipe's central axis not aligning with the fluid passage, directly causing pressure drop detection errors. Regarding bubble interference, in precision component testing scenarios where fluid purity is extremely important, even tiny bubbles can disrupt flow field stability. Existing devices rely solely on natural fluid settling to remove bubbles, which cannot handle bubbles introduced during pump start-up and shutdown. These bubbles adhere to the pressure sensor probe, causing significant fluctuations in the test data. From a fluid recovery and maintenance perspective, the test fluid often carries impurities from the inner walls of the pipes. The single-layer filter of the existing device quickly becomes clogged. After testing a certain number of pipes, the system must be shut down to clean the filter, consuming a large amount of fluid to replenish the lost portion. Furthermore, improper disassembly and reassembly of components during the cleaning process can affect the accuracy of subsequent tests. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a flow resistance testing device that solves the problems of inconvenient compatibility with test pieces of different specifications, bubble interference affecting detection accuracy, low fluid recycling rate, and cumbersome maintenance in existing flow resistance testing devices.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A flow resistance testing device includes a housing. A length adjustment assembly is installed inside the housing. From left to right, a fixed block and a support base are fixedly connected inside the housing. A fixed base is fixedly connected to the side of the fixed block near the support base. A round rod is uniformly fixedly connected between the fixed block and the support base. A slider is slidably connected to the outer wall of the round rod. A movable base is fixedly connected to the side of the slider near the fixed base. Both the fixed block and the movable base have internal cavities. A water tank is fixedly connected inside the housing. A first water pump is installed inside the water tank. An inlet pipe is fixedly connected to the output end of the first water pump. A connecting hose is installed inside the internal cavity, and one end of the connecting hose is fixedly connected to the inlet pipe. The docking hose is externally fitted with a first pressure pad and a second pressure pad. A water outlet pipe is fixedly connected to the inside of the movable seat. An air bubble cleaning assembly is provided inside the fixed seat. The air bubble cleaning assembly includes a scraper, which is rotatably connected to the connection between the docking hose and the water inlet pipe. A pressure sensor is installed inside the docking hose. A pad is fixedly connected to the outer wall of the fixed seat. A bolt is threaded inside the pad and passes through a threaded hole on the pad. The end of the bolt near the fixed seat abuts against the outer surfaces of the first and second pressure pads. Springs are fixedly connected to both the first and second pressure pads and the inner wall of the fixed seat. A screening and filtering assembly and a collection and circulation assembly are provided inside the housing.

[0007] Preferably, the length adjustment assembly includes a hydraulic rod, which is fixedly connected inside the support base. The output end of the hydraulic rod is fixedly connected to a telescopic member, which is fixedly connected to the side of the slider away from the movable base.

[0008] Preferably, the bubble cleaning assembly further includes a first motor, which is fixedly connected inside the housing. The output end of the first motor is fixedly connected to a first rotating shaft, and the end of the first rotating shaft away from the first motor is fixedly connected to the scraper.

[0009] Preferably, the screening and filtering assembly includes a filter plate, which is fixedly connected to the bottom of the fixed block. A collection trough is fixedly connected inside the housing, and a filter screen is installed inside the collection trough. A second rotating shaft is fixedly connected inside the filter screen. A telescopic rod is fixedly installed between the bottom of the filter screen and the inner wall of the collection trough. A second motor is fixedly connected inside the housing, and an eccentric wheel is fixedly connected to the output end of the second motor.

[0010] Preferably, the collection and circulation assembly includes a conveying pipe, which is fixedly connected to the outer wall of the collection tank. A bottom plate is fixedly connected to the inside of the housing. A collection bucket is installed on the top of the bottom plate. A sliding groove is opened on the top of the bottom plate. A second water pump is installed inside the collection tank.

[0011] Preferably, a test piece is inserted into the other end of the docking hose, and the end of the water outlet pipe away from the movable seat is fixedly connected to the inside of the water tank.

[0012] Preferably, the outer wall of the enclosure is equipped with a first door and a second door from top to bottom, and a display screen and a control panel are installed on the side of the enclosure near the first door.

[0013] Preferably, the eccentric wheel is rotatably connected inside the collection tank, and the eccentric wheel abuts against the bottom of the filter screen.

[0014] Preferably, the delivery pipe is positioned directly above the collection bucket, a handle is fixedly connected to the outer wall of the collection bucket, the collection bucket is slidably connected to the middle of the chute, and the end of the second water pump away from the collection chute is fixedly connected to the inside of the water tank.

[0015] This invention provides a flow resistance testing device. It has the following advantages:

[0016] 1. This invention operates the length adjustment component via a control panel. The hydraulic rod drives the telescopic component to slide the moving seat along the round rod, precisely adjusting the distance between the moving seat and the fixed seat. The bolts press the first and second pressure pads together with the spring elastic pressure to achieve a seal at the joint. Compared with the poor compatibility of test pieces and the reliance on manual adjustment for sealing in the prior art, this invention achieves rapid adaptation and automated sealing and fixing of test pieces of different lengths. This is beneficial to improving test preparation efficiency, avoiding test data deviations caused by fluid leakage, and ensuring the efficiency and accuracy of flow rate testing.

[0017] 2. This invention starts the first motor before testing, which drives the scraper to rotate at the fluid passage connection. Combined with the continuous defoaming action during the fluid circulation process, compared with the existing technology where fluid bubbles easily interfere with pressure detection, this invention achieves efficient removal of bubbles in the test fluid. This helps to ensure the stability of the fluid flow state, improve the accuracy of the data collected by the pressure sensor, and indirectly improve the reliability of the flow resistance calculation results.

[0018] 3. This invention employs a dual structure of preliminary filtration via a filter plate and fine filtration via vibrating filter screen. A second motor drives an eccentric wheel to vibrate the filter screen around a pivot point, which, in conjunction with a telescopic rod, achieves resetting. Compared to existing technologies where filtration devices are prone to clogging and have poor purification effects, this invention achieves efficient, graded filtration of impurities in the test fluid. This helps prevent impurity accumulation from affecting device operation, while ensuring the cleanliness of the circulating fluid and extending the equipment's lifespan. 4. This invention uses a second water pump to return the filtered clean fluid to the water tank, where impurities are collected centrally in a collection bucket. Compared to existing technologies where test fluid is wasted and impurity cleaning is cumbersome, this invention achieves the recycling of test fluid and convenient collection of impurities. This helps reduce the cost of test consumables, decrease wastewater discharge, and improve the ease of operation and environmental friendliness of the device. Attached Figure Description

[0019] Figure 1 This is a perspective view of the present invention;

[0020] Figure 2 A schematic diagram of the control panel of the present invention is provided to highlight its structure.

[0021] Figure 3 A schematic diagram illustrating the structure of the collection tank of the present invention;

[0022] Figure 4 A schematic diagram illustrating the structure of the length adjustment component of the present invention is provided.

[0023] Figure 5 A schematic diagram illustrating the structure of the docking hose of the present invention;

[0024] Figure 6 A schematic diagram illustrating the structure of the bubble removal assembly of the present invention;

[0025] Figure 7 A schematic diagram illustrating the structure of the screening and filtering assembly of the present invention is provided.

[0026] Figure 8 A schematic diagram illustrating the structure of the collection and circulation component of the present invention.

[0027] The components include: 1. Box body; 2. First box door; 3. Second box door; 4. Display screen; 5. Control panel; 6. Length adjustment assembly; 61. Hydraulic rod; 62. Telescopic component; 7. Bubble cleaning assembly; 71. First motor; 72. First rotating shaft; 73. Scraper; 8. Screening and filtering assembly; 81. Filter plate; 82. Filter screen; 83. Telescopic rod; 84. Second rotating shaft; 85. Second motor; 86. Eccentric wheel; 9. Collection and circulation assembly; 91. Conveying pipe; 92. Bottom. 93. Plate; 94. Collection bucket; 95. Slide groove; 96. Second water pump; 97. Handle; 10. Fixing block; 11. Fixing seat; 12. Sliding block; 13. Moving seat; 14. Support seat; 15. Round rod; 16. Collection trough; 17. Pressure sensor; 18. Inner cavity; 19. Connecting hose; 20. First pressure pad; 21. Second pressure pad; 22. Spring; 23. Pad; 24. Bolt; 25. Water tank; 26. First water pump; 27. Inlet pipe; 28. Outlet pipe. Detailed Implementation

[0028] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] Please see the appendix Figure 1 -Appendix Figure 5This invention provides a flow resistance testing device, including a housing 1. A length adjustment assembly 6 is installed inside the housing 1. From left to right, a fixing block 10 and a support base 14 are fixedly connected inside the housing 1. A fixing base 11 is fixedly connected to the side of the fixing block 10 near the support base 14. A round rod 15 is uniformly fixedly connected between the fixing block 10 and the support base 14. A slider 12 is slidably connected to the outer wall of the round rod 15. A movable base 13 is fixedly connected to the side of the slider 12 near the fixing base 11. Both the fixing block 10 and the movable base 13 have internal cavities 18. A water tank 25 is fixedly connected inside the housing 1. A first water pump 26 is installed inside the water tank 25. An inlet pipe 27 is fixedly connected to the output end of the first water pump 26. A connecting hose 19 is installed inside the internal cavity 18. A first pressure pad 20 and a second pressure pad 21 are installed on the outside of the connecting hose 19. An outlet pipe 28 is fixedly connected inside the movable base 13. An air bubble removal assembly 7 is installed inside the fixing base 11. The cleaning component 7 includes a scraper 73, which is rotatably connected to the connection between the docking hose 19 and the inlet pipe 27. A pressure sensor 17 is installed inside the docking hose 19. A pad 23 is fixedly connected to the outer wall of the fixed base 11. A bolt 24 is threadedly connected inside the pad 23. A spring 22 is fixedly connected to both the first pressure pad 20 and the second pressure pad 21 and the inner wall of the fixed base 11. The housing 1 is equipped with a screening and filtering component 8 and a collection and circulation component 9. One end of the docking hose 19 is fixedly connected to the inlet pipe 27, and a test piece is inserted into the other end of the docking hose 19. The end of the outlet pipe 28 away from the moving base 13 is fixedly connected to the inside of the water tank 25. The bolt 24 passes through the threaded hole on the pad 23, and the end of the bolt 24 near the fixed base 11 abuts against the outer surface of the first pressure pad 20 and the second pressure pad 21. A first door 2 and a second door 3 are installed on the outer wall of the housing 1 from top to bottom. A display screen 4 and a control panel 5 are installed on the side of the housing 1 near the first door 2.

[0030] Specifically, after aligning both ends of the test piece and inserting it into the docking hose 19, the bolt 24 inside the pad 23 on the outer wall of the fixing seat 11 is rotated. As the bolt 24 is pushed into the fixing seat 11, it simultaneously squeezes the first pressure pad 20 and the second pressure pad 21 on both sides, causing the two pressure pads to tighten inward from the radial direction of the docking hose 19. At this time, the spring 22 connecting the first pressure pad 20, the second pressure pad 21 and the inner wall of the fixing seat 11 is compressed, generating a continuous and uniform reverse elastic force. This elastic pressure allows the pressure pads to always fit tightly against the outer wall of the docking hose 19, causing the docking hose 19 to undergo adaptive deformation and firmly wrap around the interface of the test piece. Compared with the rigid clamping seal used in traditional devices, this structure avoids the problem of test piece interface damage or docking hose 19 breakage caused by rigid compression. It can also adapt to test pieces with different interface diameters through the elastic compensation effect of the spring 22. Even if there is a slight dimensional deviation in the test piece interface, the expansion and contraction of the spring 22 can ensure stable sealing pressure, which helps to improve the reliability and versatility of the interface seal of the flow resistance testing device.

[0031] Please see the appendix Figure 4 The length adjustment component 6 includes a hydraulic rod 61, which is fixedly connected inside the support base 14. The output end of the hydraulic rod 61 is fixedly connected to a telescopic member 62, which is fixedly connected to the side of the slider 12 away from the movable base 13.

[0032] Specifically, by activating the hydraulic rod 61, the output end of the hydraulic rod 61 drives the telescopic component 62 to perform a linear telescopic movement. One end of the telescopic component 62 is connected to the hydraulic rod 61, and the other end is fixed to the slider 12. In this way, the movement of the telescopic component 62 can directly drive the slider 12 to move synchronously. The side of the slider 12 closest to the moving seat 13 is connected to the moving seat 13. The moving seat 13 is fitted onto the round rod 15 between the fixed block 10 and the support seat 14. Therefore, when the slider 12 moves, it will push the moving seat 13 to slide smoothly along the round rod 15 without any deviation. The entire process does not require manual tightening of bolts 24 to replace parts. The thrust of the hydraulic rod 61 is stable, and the transmission of the telescopic component 62 is precise. The position of the movable seat 13 can be adjusted into place in one go, and the distance between it and the fixed seat 11 is just right to match the length of the test piece. Compared with the previous slow and inaccurate manual adjustment, this linkage method of driving the slider 12 and the movable seat 13 through the hydraulic rod 61 is much faster. Moreover, the round rod 15 can also guide the movable seat 13 to ensure that both ends of the test piece can be aligned with the docking hose 19 when installed, without the need for repeated position calibration, which saves a lot of time for subsequent sealing and testing.

[0033] Please see the appendix Figure 5 -Appendix Figure 6The bubble cleaning component 7 also includes a first motor 71, which is fixedly connected inside the housing 1. The output end of the first motor 71 is fixedly connected to a first rotating shaft 72. The end of the first rotating shaft 72 away from the first motor 71 is fixedly connected to a scraper 73. The scraper 73 is rotatably connected to the connection between the docking hose 19 and the water inlet pipe 27.

[0034] Specifically, by starting the first motor 71, the first rotating shaft 72 is synchronously driven to rotate. The first rotating shaft 72 drives the scraper 73 at its end to rotate continuously at the connection between the docking hose 19 and the water inlet pipe 27. At the same time, the first water pump 26 delivers the fluid in the water tank 25 to the connection point through the water inlet pipe 27. During the rotation of the scraper 73, its edge adheres to the inner wall of the pipe, scraping away air bubbles mixed in the fluid and those attached to the pipe wall, preventing air bubbles from entering the docking hose 19 and the interior of the test piece with the fluid. This method removes air bubbles before the fluid enters the test piece, preventing air bubbles from interfering with the fluid flow state, ensuring that the pressure sensor 17 in the docking hose 19 can stably collect the inlet and outlet pressure data of the test piece, reducing detection errors caused by air bubbles, and improving the accuracy of the test results.

[0035] Please see the appendix Figure 7 -Appendix Figure 8 The screening and filtering assembly 8 includes a filter plate 81, which is fixedly connected to the bottom of the fixing block 10. A collection tank 16 is fixedly connected inside the housing 1. A filter screen 82 is installed inside the collection tank 16. A second rotating shaft 84 is fixedly connected inside the filter screen 82. A telescopic rod 83 is fixedly installed between the bottom of the filter screen 82 and the inner wall of the collection tank 16. A second motor 85 is fixedly connected inside the housing 1. An eccentric wheel 86 is fixedly connected to the output end of the second motor 85. The eccentric wheel 86 is rotatably connected inside the collection tank 16 and abuts against the bottom of the filter screen 82.

[0036] Specifically, the fluid flowing from the test piece and pipeline first passes through the filter plate 81 at the bottom of the fixed block 10. The filter plate 81 intercepts larger particles of impurities in the fluid. The pre-filtered fluid falls onto the filter screen 82 in the collection tank 16. At the same time, the second motor 85 starts and drives the eccentric wheel 86 to rotate in the collection tank 16. During the rotation of the eccentric wheel 86, it periodically pushes against the bottom of the filter screen 82, causing the filter screen 82 to swing up and down around the second rotating shaft 84. The telescopic rod 83 at the bottom of the filter screen 82 extends and retracts synchronously with the swing of the filter screen 82. The filter screen 82 performs fine filtration of the fluid during the swing, separating out the fine impurities in the fluid. This method improves the impurity removal effect through the staged filtration of the filter plate 81 and the filter screen 82. At the same time, the eccentric wheel 86 drives the filter screen 82 to swing to avoid impurities clogging the filter screen 82 mesh, reduce the frequency of filter screen 82 disassembly and cleaning, ensure the stability of fluid filtration efficiency, and provide clean conditions for subsequent fluid recycling.

[0037] Please see the appendix Figure 7-Appendix Figure 8 The collection and circulation assembly 9 includes a conveying pipe 91, which is fixedly connected to the outer wall of the collection tank 16. A base plate 92 is fixedly connected to the inside of the housing 1. A collection bucket 93 is installed on the top of the base plate 92. A sliding groove 94 is opened on the top of the base plate 92. A second water pump 95 is installed inside the collection tank 16. The conveying pipe 91 is located directly above the collection bucket 93. A handle 96 is fixedly connected to the outer wall of the collection bucket 93. The collection bucket 93 is slidably connected to the middle of the sliding groove 94. The end of the second water pump 95 away from the collection tank 16 is fixedly connected to the inside of the water tank 25.

[0038] Specifically, the clean fluid filtered by the screening and filtering assembly 8 is retained at the bottom of the collection tank 16. After the second water pump 95 is started, the clean fluid in the collection tank 16 is extracted and transported to the water tank 25 to realize the recycling of the fluid. This process helps to reduce fluid consumption during the test, reduce test costs, and avoid the environmental impact caused by direct discharge of fluid. The impurities filtered by the filter screen 82 fall into the inlet of the conveying pipe 91 in the collection tank 16 under their own gravity and the swinging action of the filter screen 82. They are directly transported to the collection bucket 93 directly below it for centralized collection. When the impurities in the collection bucket 93 accumulate to a certain amount, the operator can use the handle 96 to pull the collection bucket 93 out along the sliding groove 94 on the bottom plate 92 for cleaning. After cleaning, the collection bucket 93 is pushed back to its original position along the sliding groove 94. This method not only avoids the contamination of the equipment by centralized collection, but also reduces the difficulty of cleaning impurities by the sliding design of the collection bucket 93. This helps to improve equipment maintenance efficiency, reduce maintenance downtime, and thus ensure the continuity of the overall testing work.

[0039] Working principle: Before the device is started, the test parameters are preset through the control panel 5. According to the length of the test piece, the control panel 5 instructs the length adjustment component 6 to work. The hydraulic rod 61 drives the telescopic component 62 to extend and retract, pushing the slider 12 to move, which in turn pushes the moving seat 13 to slide along the round rod 15. The distance between the moving seat 13 and the fixed seat 11 is adjusted to match the length of the test piece. The two ends of the test piece are aligned with the connecting hose 19 inside the fixed seat 11 and the moving seat 13. The bolt 24 inside the pad 23 is rotated to squeeze the first pressure pad 20 and the second pressure pad 21 to fit the connecting hose 19. The spring 22 is compressed to generate elastic pressure, ensuring a seal at the connection point. The pre-test positioning and sealing preparation are completed, and the device enters the standby state.

[0040] During the test preparation phase, the control panel 5 starts the bubble cleaning component 7 to preheat. The first motor 71 drives the first rotating shaft 72 to rotate, which in turn drives the scraper 73 to rotate at the connection between the connecting hose 19 and the inlet pipe 27, in preparation for removing fluid bubbles. At the same time, the first water pump 26 is started, which draws the fluid in the water tank 25 into the test piece through the inlet pipe 27 and the connecting hose 19, and then returns it to the water tank 25 through the outlet pipe 28, forming a fluid circulation. The scraper 73 rotates to scrape away air bubbles in the fluid, preventing air bubbles from entering the test piece and affecting the data. The pressure sensor 17 in the fixed block 10 and the moving seat 13 begins self-testing, completing the pre-test preparation.

[0041] During the test, pressure sensor 17 collects fluid pressure data at the inlet and outlet of the test piece in real time. The data is processed by the internal module of control panel 5 and converted into flow resistance value, which is then displayed on display screen 4. When the test is completed, the test piece is removed and fluid flows out. The fluid carries impurities. The returned fluid is first filtered by filter plate 81 to intercept larger particles of impurities before flowing into collection tank 16. Control panel 5 starts the second motor 85, which drives the eccentric wheel 86 to rotate. The eccentric wheel 86 periodically contacts the filter screen 82. With the second rotating shaft 84 as the fulcrum, the filter screen 82 also vibrates periodically up and down. The telescopic rod 83 resets in response. The filter screen 82 performs fine filtration of the fluid, separating small impurities.

[0042] After a single test piece is completed, the pressure sensor 17 stops data acquisition, the first water pump 26, the first motor 71, and the second motor 85 stop in sequence, and the scraper 73 and the eccentric wheel 86 stop operating. Then, the collection and circulation assembly 9 is started, and the second water pump 95 pumps the filtered clean fluid in the collection tank 16 to the water tank 25 to complete the fluid recovery. The impurities generated by filtration fall into the collection bucket 93 through the conveying pipe 91. The operator can use the handle 96 to pull out the collection bucket 93 along the sliding groove 94 of the bottom plate 92 for cleaning. Rotating the bolt 24 releases the compression of the first pressure pad 20 and the second pressure pad 21, removes the test piece, and the hydraulic rod 61 drives the moving seat 13 to reset. The device waits for the next test command.

Claims

1. A flow resistance testing device comprising a housing (1), characterized in that The box (1) is equipped with a length adjustment component (6). A fixing block (10) and a support base (14) are fixedly connected from left to right inside the box (1). A fixing base (11) is fixedly connected to the side of the fixing block (10) near the support base (14). A round rod (15) is evenly fixedly connected between the fixing block (10) and the support base (14). A slider (12) is slidably connected to the outer wall of the round rod (15). The slider (12) is fixed to the side of the fixing base (11). A movable base (13) is connected to the fixed block (10). Both the movable base (13) and the fixed block (10) have an inner cavity (18). A water tank (25) is fixedly connected inside the housing (1). A first water pump (26) is installed inside the water tank (25). The output end of the first water pump (26) is fixedly connected to an inlet pipe (27). A connecting hose (19) is installed inside the inner cavity (18). One end of the connecting hose (19) is fixedly connected to the inlet pipe (27). The outer surface of the connecting hose (19) is... The unit is equipped with a first pressure pad (20) and a second pressure pad (21). A water outlet pipe (28) is fixedly connected inside the movable seat (13). An air bubble cleaning assembly (7) is provided inside the fixed seat (11). The air bubble cleaning assembly (7) includes a scraper (73). The scraper (73) is rotatably connected to the connection between the docking hose (19) and the water inlet pipe (27). A pressure sensor (17) is installed inside the docking hose (19). A pad (23) is fixedly connected to the outer wall of the fixed seat (11). The pad (23) is internally threaded with a bolt (24), which passes through the threaded hole on the pad (23). The end of the bolt (24) near the fixed seat (11) abuts against the outer surface of the first pressure pad (20) and the second pressure pad (21). The first pressure pad (20) and the second pressure pad (21) are fixedly connected to the inner wall of the fixed seat (11) with springs (22). The box (1) is internally provided with a screening and filtering assembly (8) and a collection and circulation assembly (9).

2. The flow resistance testing device according to claim 1, characterized in that, The length adjustment assembly (6) includes a hydraulic rod (61), which is fixedly connected inside the support base (14). The output end of the hydraulic rod (61) is fixedly connected to a telescopic member (62), which is fixedly connected to the side of the slider (12) away from the movable base (13).

3. The flow resistance testing device according to claim 1, characterized in that, The bubble cleaning assembly (7) also includes a first motor (71), which is fixedly connected inside the housing (1). The output end of the first motor (71) is fixedly connected to a first rotating shaft (72), and the end of the first rotating shaft (72) away from the first motor (71) is fixedly connected to the scraper (73).

4. The flow resistance testing device according to claim 1, characterized in that, The screening and filtering assembly (8) includes a filter plate (81), which is fixedly connected to the bottom of the fixed block (10). A collection trough (16) is fixedly connected inside the housing (1). A filter screen (82) is installed inside the collection trough (16). A second rotating shaft (84) is fixedly connected inside the filter screen (82). A telescopic rod (83) is fixedly installed between the bottom of the filter screen (82) and the inner wall of the collection trough (16). A second motor (85) is fixedly connected inside the housing (1). An eccentric wheel (86) is fixedly connected to the output end of the second motor (85).

5. The flow resistance testing device according to claim 4, characterized in that, The collection and circulation assembly (9) includes a conveying pipe (91), which is fixedly connected to the outer wall of the collection tank (16). A bottom plate (92) is fixedly connected inside the box (1). A collection bucket (93) is installed on the top of the bottom plate (92). A sliding groove (94) is opened on the top of the bottom plate (92). A second water pump (95) is installed inside the collection tank (16).

6. The flow resistance testing device according to claim 1, characterized in that, The other end of the docking hose (19) is used to insert the test piece, and the end of the water outlet pipe (28) away from the movable seat (13) is fixedly connected to the inside of the water tank (25).

7. The flow resistance testing device according to claim 1, characterized in that, The outer wall of the box (1) is equipped with a first door (2) and a second door (3) from top to bottom. A display screen (4) and a control panel (5) are installed on the side of the box (1) near the first door (2).

8. The flow resistance testing device according to claim 4, characterized in that, The eccentric wheel (86) is rotatably connected inside the collection tank (16), and the eccentric wheel (86) abuts against the bottom of the filter screen (82).

9. A flow resistance testing device according to claim 5, characterized in that, The delivery pipe (91) is located directly above the collection bucket (93). A handle (96) is fixedly connected to the outer wall of the collection bucket (93). The collection bucket (93) is slidably connected to the middle of the chute (94). The end of the second water pump (95) away from the collection chute (16) is fixedly connected to the inside of the water tank (25).

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