A large flow vertical centrifugal pump water medium test circuit device

Abstract

The application discloses a large-flow vertical centrifugal pump water medium test loop device, and relates to the field of pump body test devices. The device comprises a main body base, a steady flow tank for stabilizing the incoming water flow is arranged on one side of the top of the main body base, an inlet pipeline is arranged in butt joint with the output end of the steady flow tank, a pump body for providing transmission power is arranged at the end of the inlet pipeline away from the steady flow tank, an outlet pipeline is arranged in butt joint with the end of the pump body away from the inlet pipeline, a transition tank for uniform flow is arranged at the end of the outlet pipeline away from the pump body, and a plurality of flow measurement pipelines are arranged at the end of the transition tank away from the outlet pipeline, and the plurality of flow measurement pipelines are communicated with the steady flow tank. The application divides the measurement pipeline to detect the fluid, reduces the overall occupied area of the pipeline, and reserves the installation space for the flow meter.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of pump body test device, in particular to a large flow vertical centrifugal pump water medium test loop device. BACKGROUND

[0002] In the design, development and finished product acceptance process of centrifugal pumps, in order to verify whether it meets the design requirements or meets the contract requirements, tests and tests must be carried out on a special test device, which helps to ensure that the centrifugal pump can run stably and meet the expected performance indicators in actual application. The vertical centrifugal pump water medium test loop device usually includes a main loop system and an auxiliary system. The main loop system is mainly composed of a vertical centrifugal pump, a pressure stabilizer, a flow meter, a condenser and the like.

[0003] Among them, water is very common as a test medium in centrifugal pump tests because of its stable density, viscosity and flow performance and easy to obtain characteristics, but in large flow water medium test, due to the high density and large flow of water, the corresponding size of the pipeline needs to be configured, but with the increase of the size of the pipeline, the installation space of the flow meter is insufficient, and at the same time, due to the change of the size of the pipeline, the liquid cannot fill the pipeline to flow with gas, thereby affecting the flow rate data of the liquid. SUMMARY

[0004] In order to improve the problem that the flow meter cannot reserve enough installation space synchronously with the size of the pipeline in the conventional centrifugal pump water medium test loop device when corresponding large flow test is carried out, and the size of the pipeline does not match the flow, thereby causing cavitation, the present application provides a large flow vertical centrifugal pump water medium test loop device.

[0005] The large flow vertical centrifugal pump water medium test loop device provided by the present application adopts the following technical scheme:

[0006] A large flow vertical centrifugal pump water medium test loop device, comprising a main body base, a flow stabilizing tank for stabilizing the imported water flow is arranged on one side of the top of the main body base, a pump body for providing transmission power is connected to one side of the flow stabilizing tank, a transition tank for uniform flow is connected to one end of the pump body away from the flow stabilizing tank, a plurality of flow measurement pipelines for flow measurement are arranged on one end of the transition tank away from the outlet pipeline, and the plurality of flow measurement pipelines are in communication with the flow stabilizing tank to form a closed test loop.

[0007] The middle part of the outlet pipeline is provided with an adjustable size adjusting pipe body, the inner surface of the adjusting pipe body is provided with a deformable inner pipe body, the inner surface of the inner pipe body is surrounded by a plurality of extrusion layers, the inner pipe body and the plurality of extrusion layers are provided with ring plates for applying deformation pressure to the inner pipe body, the outer surface of the adjusting pipe body is inserted with a plurality of pressure shells, the surface of the plurality of pressure shells is surrounded by a tightening belt for tightening the inner pipe body, the plurality of pressure shells are penetrated through the adjusting pipe body and the inner pipe body and are fixedly connected, and the plurality of pressure shells and the plurality of ring plates are one-to-one center-aligned to form a power transmission relationship.

[0008] By adopting the above technical scheme, the plurality of flow measurement pipelines are connected with the transition tank, so that the water flow transmitted by the outlet pipeline is divided into multiple parts for separate measurement, and the total measurement value is obtained by adding the plurality of measurement values, thereby ensuring the accuracy of the measurement data, and the flow measurement pipeline is divided into multiple parts, thereby reducing the overall occupied space and solving the problem of insufficient installation space of the flowmeter, and the tightening belt is tightened to apply pressure to the plurality of pressure shells, so that the pressure shells are pressed into the ring plates to generate pressure, the ring plates receive the pressure and press into the extrusion layers, thereby reducing the size of the extrusion layers, the gas in the pressure shells is discharged as the tightening belt is tightened, thereby being discharged into the inner pipe body to deform, and then being filled into the gaps between the plurality of extrusion layers, so that the overall size of the pipeline is reduced while the inner wall remains smooth, thereby adjusting the size of the pipeline to match the liquid flow rate and avoiding the problems of air bubbles and air pockets.

[0009] Preferably, the output end of the flow stabilizing tank is provided with an inlet pipeline, the end of the inlet pipeline away from the flow stabilizing tank is in communication with a pump body, the end of the pump body away from the inlet pipeline is provided with an outlet pipeline, and the end of the outlet pipeline away from the pump body is in communication with the transition tank.

[0010] By adopting the above technical scheme, the inlet pipeline is in communication with the flow stabilizing tank and the pump body, and the outlet pipeline is in communication with the pump body and the transition tank, thereby forming a loop seal circulation of the device to provide a circulation space for the flow of the test liquid.

[0011] Preferably, one end of the surface of the adjusting pipe body is provided with two fixed protrusions, one outer surface of the fixed protrusions is fixedly provided with a self-locking motor, the output end of the self-locking motor penetrates between the two fixed protrusions, and a transmission gear fixedly connected with the output end of the self-locking motor is rotatably arranged between the two fixed protrusions.

[0012] By adopting the above technical scheme, the transmission gear is rotatably arranged between the two fixed protrusions to maintain rotation, and the output end of the self-locking motor is fixedly connected with the transmission gear to provide power.

[0013] Preferably, the adjusting pipe body surface is provided with a rotating groove on the side away from the self-locking motor, a rotating rod is rotatably arranged in the rotating groove, the rotating rod surface is fixedly connected with the two ends of the tightening belt, the rotating rod surface is movably penetrated between the two fixed protrusions, and the penetrating surface of the rotating rod is provided with a gear meshing with the transmission teeth.

[0014] By adopting the above technical scheme, the rotating groove provides space for the rotation of the rotating rod, and the rotation of the rotating rod winds the tightening belt at both ends, so that the rotating groove provides storage space for the winding part of the tightening belt, and the gear at one end of the rotating rod meshes with the transmission teeth, thereby receiving synchronous rotation by the rotation force of the transmission teeth to provide power.

[0015] Preferably, the adjusting pipe body surface is provided with a rotating groove on the side away from the self-locking motor, a rotating rod is rotatably arranged in the rotating groove, the rotating rod surface is fixedly connected with the two ends of the tightening belt, the rotating rod surface is movably penetrated between the two fixed protrusions, and the penetrating surface of the rotating rod is provided with a gear meshing with the transmission teeth.

[0016] By adopting the above technical scheme, the rotating groove provides space for the rotation of the rotating rod, and the rotation of the rotating rod winds the tightening belt at both ends, so that the rotating groove provides storage space for the winding part of the tightening belt, and the gear at one end of the rotating rod meshes with the transmission teeth, thereby receiving synchronous rotation by the rotation force of the transmission teeth to provide power.

[0017] Preferably, the adjusting pipe body surface is provided with a rotating groove on the side away from the self-locking motor, a rotating rod is rotatably arranged in the rotating groove, the rotating rod surface is fixedly connected with the two ends of the tightening belt, the rotating rod surface is movably penetrated between the two fixed protrusions, and the penetrating surface of the rotating rod is provided with a gear meshing with the transmission teeth.

[0018] By adopting the above technical scheme, the gas flows into the gas guide cavity from the gas port, and then into the filling capsule, so that the filling capsule receives the gas to form expansion on the inner wall of the extrusion layer and abuts against the deformed side wall of the extrusion layer to form a seal.

[0019] Preferably, the adjusting pipe body surface is provided with a rotating groove on the side away from the self-locking motor, a rotating rod is rotatably arranged in the rotating groove, the rotating rod surface is fixedly connected with the two ends of the tightening belt, the rotating rod surface is movably penetrated between the two fixed protrusions, and the penetrating surface of the rotating rod is provided with a gear meshing with the transmission teeth.

[0020] By adopting the above technical scheme, the pressure block is pressed into the gas storage groove under the pressure, and when the pressure block is located at the bottom of the gas storage groove, the gas in the gas storage groove enters the filling capsule from the gas guide cavity, and at the same time, the pressure block drives the pressure shell to apply pressure to the inner pipe body, thereby pushing the ring plate downward.

[0021] Preferably, the adjusting pipe body surface is provided with a rotating groove on the side away from the self-locking motor, a rotating rod is rotatably arranged in the rotating groove, the rotating rod surface is fixedly connected with the two ends of the tightening belt, the rotating rod surface is movably penetrated between the two fixed protrusions, and the penetrating surface of the rotating rod is provided with a gear meshing with the transmission teeth.

[0022] Through the above technical scheme, the torsional spring is stretched to apply a pushing force to the two expansion plates, so that the two expansion plates are extended along the extension grooves and kept in an extended state, when the ring plate is moved downward under pressure, the two expansion plates abut against the extrusion layer to be pressed into the extension grooves, and the extrusion layer is synchronously extruded and deformed at the part pressed into the expansion plate, so that the inner walls of the plurality of extrusion layers are kept arc-shaped.

[0023] Preferably, a flow meter for testing water flow rate is arranged in the middle of each of the plurality of flow measurement pipelines, and a control valve is arranged at a position between the side of the flow measurement pipeline away from the flow meter and the opposite end of the steady flow tank.

[0024] Through the above technical scheme, the control valve is arranged in the flow measurement pipeline to be opened and closed, so as to control the water flow in the transition tank to be discharged into the steady flow tank, and the plurality of flow measurement pipelines are regulated according to the number of opened and closed control valves, so as to affect the water flow rate for testing.

[0025] Preferably, the steady flow tank is arranged adjacent to the inlet pipeline and is connected to the overflow pipeline, the overflow pipeline is connected to the pump body, the steady flow tank is arranged opposite to the other end of the overflow pipeline and is connected to the inlet pipe, and the middle of each of the plurality of flow measurement pipelines is arranged with a lead-out pipe connected to an external cooling device.

[0026] Through the above technical scheme, the overflow pipeline connects the pump body and the steady flow tank, so that the overflow water flow in the pump body is returned to the steady flow tank, so as to reduce the internal pressure of the loop, and the lead-out pipe is connected to the external cooling device, so that the water flow in the flow detection pipeline is discharged to the outside for cooling, and then is connected to the steady flow tank through the lead-in pipe, so as to keep the temperature of the water flow in the loop stable.

[0027] In summary, the present application has at least one of the following beneficial technical effects:

[0028] 1. The water flow discharged from the outlet pipeline is divided by the plurality of flow measurement pipelines, and the flow measurement pipelines are opened and closed by the plurality of control valves, and the flow meter arranged in the middle of each flow measurement pipeline, so as to effectively release the pumping performance of the pump body, to distribute the different water flow pumped by the pump body, to ensure the accuracy of the flow data, and to reduce the overall occupied area by splitting the plurality of flow measurement pipelines, to reserve a fixing space for the installation of the flow meter.

[0029] 2. The pressure shell is pressed by the tightening belt to extrude the ring plate and the extrusion layer to deform, the multiple extrusion layers deform to reduce the inner wall range of the pipeline, and the pressure block is pressed into the gas storage cavity to deliver the gas to the filling bag to expand, the expanded filling bag abuts against the multiple deformed extrusion layers to seal the gap between the filling bag and the extrusion layer, and the inner diameter of the pipeline is smoothed, so that the inner diameter size can be changed according to the flow size, the inner diameter size is matched with the flow to reduce the excess cavity, the secondary flow buffering of the transition tank is matched, and problems such as bubbles and cavitation in the water flow are effectively avoided. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 It is a top view of the application;

[0031] Figure 2 It is a front view of the application;

[0032] Figure 3 It is a left view of the application;

[0033] Figure 4 It is a structure installation view of the application at A;

[0034] Figure 5 It is an explosion view of the adjusting pipe body of the application;

[0035] Figure 6 It is an internal sectional view of the adjusting pipe body of the application;

[0036] Figure 7 It is an adjusting sectional view of the adjusting pipe body of the application;

[0037] Figure 8 It is a front view of the adjusting pipe body of the application.

[0038] The drawings show that: 1, main body base; 2, flow stabilizing tank; 3, inlet pipeline; 4, pump body; 5, outlet pipeline; 6, transition tank; 7, flow measurement pipeline; 8, flow meter; 9, inlet pipe;

[0039] 10, outlet pipe; 11, overflow pipeline; 12, control valve; 13, adjusting pipe body; 14, inner pipe body; 15, extrusion layer; 16, tightening belt; 17, fixed lug; 18, transmission tooth; 19, self-locking motor;

[0040] 20, rotating rod; 21, rotating groove; 22, insertion slot; 23, pressure shell; 24, gas storage cavity; 25, pressure block; 26, ring plate; 27, expansion plate; 28, extension slot; 29, torsional spring;

[0041] 30, gas port; 31, gas guide cavity; 32, filling bag; 33, installation cavity. DETAILED DESCRIPTION

[0042] The following will be described in combination with the drawingsFigures 1-8 The application will be further described in detail.

[0043] The embodiment of the application discloses a large-flow vertical centrifugal pump water medium test circuit device.

[0044] Embodiment 1

[0045] Reference Figure 1 , Figure 3 The large-flow vertical centrifugal pump water medium test circuit device comprises a main base 1, a steady flow tank 2 is fixed on one side of the upper end surface of the main base 1 by using a support, a guide-in pipe 9 is communicated and connected to the inlet end of the steady flow tank 2, the other end of the guide-in pipe 9 is communicated with an external water source supply mechanism and a refrigeration mechanism, a pump body 4 is screw-fixed on one side of the upper end surface of the main base 1 and located at the steady flow tank 2, an inlet pipe 3 is communicated and connected to the inlet end of the pump body 4, and the other end of the inlet pipe 3 is communicated and connected to the outlet end of the steady flow tank 2, and meanwhile, an overflow pipe 11 is communicated and connected to the overflow port of the side surface of the pump body 4, and the other end of the overflow pipe 11 is communicated and connected to the steady flow tank 2, so that the excess water flow in the pump body 4 is discharged into the steady flow tank 2, and then the excess pressure is released.

[0046] An outlet end is arranged on the other side of the surface of the pump body 4 relative to the overflow port, an outlet pipe 5 is communicated and connected to the outlet end of the pump body 4, a transition tank 6 is screw-fixed on the upper end surface of the main base 1 and located at the end of the outlet pipe 5, the other end of the outlet pipe 5 is communicated and connected to the inlet end of the transition tank 6, a plurality of outlet ends are formed in one side of the outer surface of the transition tank 6, and a flow measurement pipe 7 (at least three flow measurement pipes 7 are arranged) is arranged at each outlet end, the other end of each flow measurement pipe 7 is communicated and connected to the steady flow tank 2, one flow measurement pipe 7 located in the middle is communicated and connected to a guide-out pipe 10, and the other end of the guide-out pipe 10 is communicated with an external cooling mechanism, so that the water flow in the flow measurement pipe 7 is discharged and cooled.

[0047] It should be noted that a flow meter 8 is arranged on the middle surface of each flow measurement pipe 7, the measurement end of each flow meter 8 penetrates the flow measurement pipe 7 and is located in the pipe and directly contacts the water flow, a control valve 12 for opening and closing is arranged at the joint of each flow measurement pipe 7 and the transition tank 6, the pipe diameter of the inlet pipe 3 is DN900, the pipe diameter of the outlet pipe 5 is DN800 under normal conditions, the pipe diameter of the flow measurement pipe 7 is DN500 when the number of the flow measurement pipes 7 is three, and the pipe diameter of the flow measurement pipe 7 is adjusted according to the number.

[0048] The implementation principle of the water medium test loop device of the large-flow vertical centrifugal pump of the embodiment of the application is as follows: when the device is used, personnel first connect the inlet pipe 9 to the refrigeration mechanism in a butt joint manner, then connect the outlet pipe 10 to the refrigeration mechanism in a butt joint manner, and then the steady flow tank 2, the pump body 4, the transition tank 6 and the remaining pipeline form a closed test loop. Water is injected into the loop. When the liquid level of the pump body 4 and the steady flow tank in the loop reaches the test standard, the injection of water is stopped. Then the personnel control the pump body 4 to operate by sending a signal through the microcomputer. The impeller in the pump body 4 rotates to do work on the liquid, and the water at the inlet is transported to the outlet pipeline 5. The outlet pipeline 5 transmits the water flow and transports the water flow to the transition tank 6. The fluid reduces the buffer pressure in the transition tank 6 and helps to eliminate the air bubbles in the fluid. The pump body 4 continuously transports the water flow to form a thrust force, and the water flow is transported to the flow measurement pipeline 7. During this period, the personnel can open and close the three control valves 12 to make the three flow measurement pipelines 7 in different open and closed states, so as to test the data at different flow rates. The water flow enters the flow measurement pipeline 7 to contact the measurement end of the flowmeter 8, so as to feed back the data such as the suction force of the pump body 4. The measured fluid flows back to the steady flow tank 2 through the control valve 12 in the open state. The three flow measurement pipelines 7 provided in this way divide the water flow transmitted by the outlet pipeline 5 for detection, and form the interval space between the three flow measurement pipelines 7, so as to reserve enough installation space for the flowmeter.

[0049] When the temperature of the water flow increases, part of the water flow is discharged from the outlet pipe 10 to the external refrigeration mechanism for cooling. Then the cooled water flow is mixed with the water flow in the inlet pipe 9 and transported to the steady flow tank 2, so as to keep the temperature of the water flow in the device stable.

[0050] Embodiment 2

[0051] With reference to Figure 2 , Figure 4 , Figure 5 The difference between this embodiment and embodiment 1 is that the outlet pipeline 5 is composed of an adjusting pipe body 13, an inner pipe body 14 and an extrusion layer 15. The adjusting pipe body 13 is arranged on the outer surface of the inner pipe body 14. The adjusting pipe body 13 is made of silicone rubber material and has a certain hardness. The inner pipe body 14 and the extrusion layer 15 are made of synthetic rubber and are easily deformed under pressure. Four protrusions made of silica gel wire are arranged on the inner wall of the inner pipe body 14. The four protrusions are sealingly and fixedly connected with the extrusion layer 15. The outer surface of the inner pipe body 14 is fixedly connected with the inner wall of the adjusting pipe body 13 at the positions of the four protrusions. A rotating groove 21 is formed in the middle of the outer surface of the adjusting pipe body 13. A rotating rod 20 is rotatably connected with the inner wall of the rotating groove 21. Two fixed lugs 17 are fixedly arranged on one side of the outer surface of the adjusting pipe body 13. A recess is formed in the adjusting pipe body 13 between the two fixed lugs 17. A transmission gear 18 is rotatably arranged between the two fixed lugs 17 and above the rotating rod 20.

[0052] It needs to be explained that one end of the rotating rod 20 is movably penetrated through a fixed protrusion 17 located in the groove, the surface of the part of the rotating rod 20 located in the groove is provided with a gear, the tooth surface of the transmission tooth 18 is engaged with the gear of the rotating rod 20 and abuts, at the same time, the outer surface of the adjusting pipe body 13 is provided with a tightening belt 16, and the two end breaks of the tightening belt 16 are respectively fixed to the surface of the rod part of the rotating rod 20, and then a self-locking motor 19 is screwed to the side surface of the fixed protrusion 17 away from the rotating groove 21, and the output end of the self-locking motor 19 is movably penetrated through the fixed protrusion 17 and fixed to the rod part of the transmission tooth 18.

[0053] The output shaft of the self-locking motor 19 drives the transmission tooth 18 to rotate, so that the gear engaged with the transmission tooth 18 drives the rotating rod 20 to rotate, and the tightening belt 16 is wound along the surface of the rotating rod 20 to be tightened, so as to provide a power source for the gas pressing into the inner pipe body 14, at the same time, the adjusting pipe body 13 is provided in the outermost layer, so as to provide support for the deformation of the inner pipe body 14, and the adjusting pipe body 13 is integrally sleeved on the outer surface of the inner pipe body 14, so as to form a limit to the inner pipe body 14, the four protrusions provided on the inner surface of the inner pipe body 14 have high density and have certain support, so that the inner pipe body 14 does not change itself when deformed, and provides a mounting fulcrum for the fixation of the extrusion layer 15.

[0054] Referring to Figure 6 Figure 7 , Figure 8 The outer surface of the adjusting pipe body 13 is provided with four insertion grooves 22 around the position where the tightening belt 16 is wound, and each insertion groove 22 is movably inserted with a pressure shell 23, at the same time, the inner pipe body 14 is provided with a gas port 30 inwardly at the position of the four insertion grooves 22, the bottom of the gas port 30 is penetrated through the side surface of the inner pipe body 14 to form a gas guide cavity 31, the cavity of the gas guide cavity 31 is arc-shaped, and the filling bag 32 is provided at the position close to the inner surface of the inner pipe body 14 at the end of the gas guide cavity 31, at the same time, the bottom of the four pressure shells 23 is fixed to the bottom of the four gas ports 30 one by one, and the upper end surface of the four pressure shells 23 is inwardly provided with a gas storage cavity 24, the bottom of the four gas storage cavities 24 is penetrated through the side wall of the pressure shell 23 and connected with the opening of the gas guide cavity 31, the four gas storage cavities 24 are elastically connected with pressure blocks 25, the side surface of the pressure block 25 is filled with lubricant, which keeps the movement smooth and forms a seal to prevent gas leakage.

[0055] It needs to be explained that the normal pressure block 25 protrudes from the top of the pressure shell 23, and a certain space is reserved between the four extrusion layers 15 and the inner tube body 14 to form a mounting cavity 33. Four ring plates 26 are arranged in the four mounting cavities 33. The top of each ring plate 26 is fixedly connected to the inner wall of the mounting cavity 33 near the inner tube body 14. An arc-shaped expansion slot 28 is formed in the inside of each ring plate 26. Two expansion plates 27 with the same arc are inserted into the expansion slot 28. The two expansion plates 27 are elastically connected by a torsional spring 29. Meanwhile, the filling bag 32 is normally in a flat rectangular shape. When filled with gas, it can expand and stretch.

[0056] The tightening belt 16 tightens and exerts pressure on the four pressure blocks 25. The four pressure blocks 25 are pressed into the gas storage cavity 24. The gas storage cavity 24 is in communication with the gas port 30, so that the gas in the gas storage cavity 24 is transported into the gas port 30. The gas enters the gas port 30 and is flushed into the filling bag 32 by the gas guide cavity 31, so that the filling bag 32 expands and deforms as a whole, forming an oval-shaped bulge. When the pressure block 25 is completely inserted into the bottom of the gas storage cavity 24, pressure is applied to the entire pressure shell 23. The bottom of the pressure shell 23 is fixedly connected to the gas port 30. The ring plate 26 in the mounting cavity 33 is in central alignment with the pressure shell 23, so that the ring plate 26 receives the pressure applied by the pressure shell 23. At the same time, the inner tube body 14 is deformed under pressure, causing the ring plate 26 to be pressed into the extrusion layer 15, thereby reducing the inner diameter of the extrusion layer 15. As the extrusion layer 15 shrinks, the gap between the two adjacent extrusion layers 15 is filled by the bulge of the filling bag 32, so that the reduced pipe diameter tends to be smooth for water flow transmission.

[0057] Among them, the device also includes a flow stabilizing tank 2, a transition tank 6, a flow meter 8, a control valve 12, a self-locking motor 19, an externally provided water source supply mechanism, and a refrigeration mechanism are prior art, and the structure principle will not be described

[0058] The implementation principle of embodiment 2 is: when the water flow flows into the adjusting pipe body 13 of the outlet pipe 5, the personnel can adjust according to the water flow input by the inlet pipe 9, so as to send a signal to control the self-locking motor 19 to run. The self-locking motor 19 drives the transmission gear 18 to rotate, and the transmission gear 18 drives the gear of the rotating rod 20 to rotate synchronously. The rotating rod 20 rotates to make the both ends of the tightening belt 16 wrap around the surface of the rotating rod 20, so as to make the tightening belt 16 shrink around the adjusting pipe body 13 as a whole. With the shrinkage of the tightening belt 16, pressure is applied to the four pressure blocks 25. With the four pressure blocks 25 being pressed into the gas storage cavity 24, the gas in the gas storage cavity 24 is input into the gas guide cavity 31 through the gas port 30, and finally into the filling bag 32, so that the filling bag 32 forms an oval expansion;

[0059] When the pressure block 25 is completely pressed into the gas storage cavity 24, the pressure is applied to the whole pressure shell 23, and the pressure shell 23 is pressed against the bottom of the gas port 30 synchronously, thereby pushing the ring plate 26 to press into the inner surface of the inner tube body 14, and the four ring plates 26 are pressed against the extrusion layer 15 from four directions, so as to be reduced, and with the extrusion of the ring plate 26 and the extrusion layer 15, the expansion plates 27 on both sides of the ring plate 26 are subjected to the interaction force and are pressed into the expansion slot 28, so as to make the deformation surface of the extrusion layer 15 more smooth. The four deformed extrusion layers 15 abut against the four expanded filling bags 32, so as to form the reduced inner diameter of the outlet pipeline 5, which can be adjusted according to the water flow drawn into the pump body 4, so as to adapt the pipeline inner diameter to the water flow, thereby avoiding the water flow bubbles formed by too much cavity, and releasing the pumping performance of the pump body 4, so as to improve the test data.

[0060] The above is only an optional embodiment of the present disclosure, and is not used to limit the present disclosure. For those skilled in the art, the present disclosure can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A large flow vertical centrifugal pump water medium test loop apparatus, characterized by: Including the main body base (1), one side of the top of the main body base (1) is provided with a steady flow tank (2) for stabilizing the incoming water flow, one side of the steady flow tank (2) is connected with a pump body (4) for providing transmission power, the end of the pump body (4) away from the steady flow tank (2) is connected with a transition tank (6) for uniform flow, the end of the transition tank (6) away from the outlet pipeline (5) is provided with a plurality of flow measuring pipelines (7), and the plurality of flow measuring pipelines (7) are communicated with the steady flow tank (2) to form a closed test loop; The middle of the outlet pipeline (5) is provided with an adjustable size adjusting pipe body (13), the inner surface of the adjusting pipe body (13) is provided with a deformable inner pipe body (14), a plurality of extrusion layers (15) are arranged around the inner surface of the inner pipe body (14), and the inner pipe body (14) and the plurality of extrusion layers (15) are provided with ring plates (26) for applying deformation pressure to the inner pipe body (14). The outer surface of the adjusting pipe body (13) is inserted with a plurality of pressure shells (23), the surface of the plurality of pressure shells (23) is provided with a tightening belt (16) for tightening the inner pipe body (14), the plurality of pressure shells (23) penetrate the adjusting pipe body (13), are fixedly connected with the inner pipe body (14), and the plurality of pressure shells (23) and the plurality of ring plates (26) are in one-to-one center alignment to form a power transmission relationship. The surface of the adjusting pipe body (13) is provided with a plurality of insertion grooves (22) at the positions of the plurality of pressure shells (23), the surface of the inner pipe body (14) is provided with air ports (30) at the positions of the plurality of insertion grooves (22), the bottom side of the plurality of air ports (30) is inwardly provided with air guide cavities (31), and the inner pipe body (14) is provided with deformable expansion filling capsules (32) at the bottoms of the plurality of air guide cavities (31).

2. A large flow vertical centrifugal pump water medium test loop apparatus according to claim 1, characterized in that: The output end of the steady flow tank (2) is provided with an inlet pipeline (3), the end of the inlet pipeline (3) away from the steady flow tank (2) is communicated with the pump body (4), the end of the pump body (4) away from the inlet pipeline (3) is provided with an outlet pipeline (5), and the end of the outlet pipeline (5) away from the pump body (4) is communicated with the transition tank (6).

3. A large flow vertical centrifugal pump water medium test loop apparatus according to claim 2, characterized in that: The surface of the adjusting pipe body (13) is provided with two fixed lugs (17), one of the two fixed lugs (17) is provided with a self-locking motor (19) on the outer surface, the output end of the self-locking motor (19) penetrates between the two fixed lugs (17), and the two fixed lugs (17) are rotatably provided with a transmission gear (18) fixedly connected with the output end of the self-locking motor (19).

4. A large flow vertical centrifugal pump water medium test loop apparatus according to claim 3, characterized in that: The surface of the adjusting pipe body (13) is provided with a rotating groove (21) on the side away from the self-locking motor (19), the rotating groove (21) is rotatably provided with a rotating rod (20), the surface of the rotating rod (20) is fixedly connected with the two ends of the tightening belt (16), the surface of the rotating rod (20) is movably penetrated between the two fixed lugs (17), and the penetrating surface of the rotating rod (20) is provided with a gear meshing with the transmission gear (18).

5. A large flow vertical centrifugal pump water medium test loop apparatus according to claim 4, characterized in that: A plurality of said pressure shell (23) are inserted by a plurality of slots (22) one by one, and are fixed to the bottom of a plurality of air port (30) one by one, a plurality of said pressure shell (23) are opened inwardly with gas storage cavity (24), the elastic connection has pressure block (25) in gas storage cavity (24), a plurality of said gas storage cavity (24) are communicated with a plurality of gas guide cavity (31) one by one through pressure shell (23).

6. A large flow vertical centrifugal pump water medium test loop apparatus according to claim 5, characterized in that: A plurality of said ring plate (26) are opened with arc-shaped expansion slot (28) inside, a plurality of said expansion slot (28) are inserted with arc-shaped expansion plate (27) in both ends of slot, the torsional spring (29) is connected between two expansion plates (27).

7. A large flow vertical centrifugal pump water medium test loop apparatus according to claim 6, characterized in that: A plurality of said flow measuring pipeline (7) are provided with flow meter (8) for testing water flow velocity in the middle, a plurality of said flow measuring pipeline (7) are provided with control valve (12) between the position away from flow meter (8) and the opposite end of steady flow tank (2).

8. A large flow vertical centrifugal pump water medium test loop apparatus according to claim 7, characterized in that: The steady flow tank (2) is provided with overflow pipeline (11) on the side adjacent to the inlet pipeline (3), the overflow pipeline (11) is connected with the pump body (4), the steady flow tank (2) is provided with the inlet pipe (9) on the other end opposite to the overflow pipeline (11), a plurality of said flow measuring pipeline (7) are provided with the outlet pipe (10) connected with the external cooling device in the middle.

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