Centrifugal pump test equipment and test method

Abstract

The invention relates to the field of centrifugal pump testing equipment, in particular to centrifugal pump testing equipment and a testing method.The centrifugal pump testing equipment comprises a multi-stage pump shell, a shaft rod mounting hole is transversely formed in the middle of the multi-stage pump shell, and testing pipes are movably connected to the two ends of the shaft rod mounting hole in an inserted mode; a hole sealing assembly is movably connected between the two test tubes, and the position of the shaft lever mounting hole is sealed through the hole sealing assembly; the opposite ends of the two test tubes are movably connected with locking sealing assemblies matched with the hole sealing assemblies. The centrifugal pump testing equipment is composed of the hole sealing assembly and the locking sealing assembly, the multi-stage pump shell, the testing pipe, the hole sealing assembly and other parts are used in cooperation, the position of the testing pipe in an inner cavity of the multi-stage pump shell can be rapidly adjusted under the action of the hole sealing assembly, and sealing testing is conducted on the positions of different cavities; therefore, the air leakage section is quickly and effectively positioned, the test precision is ensured, and the operation is convenient.

Description

Technical Field

[0001] The invention relates to the field of centrifugal pump testing equipment, in particular to a centrifugal pump testing equipment and a testing method. Background Art

[0002] Centrifugal pumps are usually divided into single-stage and multi-stage types. Multi-stage centrifugal pumps are a common fluid conveying equipment that works through multiple impellers in cascade to increase the pump head. The casing of the multi-stage centrifugal pump needs to be tested for sealing after installation to ensure the sealing effect of the casing during use.

[0003] The existing centrifugal pump inspection and testing equipment has the following problems during use that have not been well solved: 1. During use, some existing centrifugal pump testing equipment seals both ends of the shell, then delivers gas to the inside of the shell, and determines the sealing inside the shell by observing the pressure gauge. Since multi-stage centrifugal pumps are installed through multi-section shell connections, the above operation is difficult to accurately locate which section of the shell is leaking after detecting a shell with poor sealing, and the test accuracy is low. Summary of the invention

[0004] The purpose of the present invention is to provide a centrifugal pump testing device and a testing method to solve the problems raised in the above background technology: 1. It is difficult for some existing centrifugal pump testing devices to accurately locate the shell of the leaking section during the testing of a multi-stage centrifugal pump. To achieve the above purpose, the present invention provides the following technical solutions: A centrifugal pump testing device, comprising: A multi-stage pump casing, wherein a shaft rod mounting hole is transversely opened in the middle of the multi-stage pump casing, and test tubes are movably inserted at both ends of the shaft rod mounting hole; Also includes: A hole sealing component is movably connected between the two test tubes, and the shaft rod mounting hole position is sealed by the hole sealing component; The two test tubes are movably connected at opposite ends with a locking sealing assembly that matches the hole sealing assembly, and the locking sealing assembly is used to lock the position of the hole sealing assembly.

[0005] Preferably, the hole sealing assembly comprises a telescopic adjustment rod, the telescopic adjustment rod is rotatably connected to the inside of the left test tube, the inside of the right test tube is rotatably connected to a rotating rod, the right end of the telescopic adjustment rod is rotatably connected to the left end of the rotating rod, the surfaces of the telescopic adjustment rod and the rotating rod are both fixedly sleeved with an adjustment disk, and the surface of the adjustment disk is provided with six arc-shaped adjustment grooves equidistantly along the circumference; Sealing air bags are fixedly sleeved on the surfaces of the two test tubes. The two sealing air bags correspond to the two adjusting discs one by one. Six main support plates are equidistantly arranged along the circumference of the inner ring of the sealing air bag. A secondary support plate is slidably connected between two adjacent main support plates. The surfaces of the main support plates and the secondary support plates are fixedly connected to the inner wall of the sealing air bag. One end of the main support plate away from the sealing air bag is fixedly connected to a connecting rod, and one end of the connecting rod penetrates through the test tube and is slidably connected inside the corresponding arc-shaped adjusting groove; Limit tooth bars are slidably connected to the opposite ends of the telescopic adjusting rod and the rotating rod. Limit tooth blocks matched with the limit tooth bars are fixedly connected inside both test tubes.

[0006] Preferably, an extrusion spring is fixedly connected to the surface of the limit tooth bar. Retaining rings are fixedly sleeved on the ends of the telescopic adjusting rod and the rotating rod. One end of the extrusion spring abuts against the side wall of the retaining ring; Limit sleeves are rotatably connected to the opposite ends of the two test tubes. The two limit tooth bars are respectively movably inserted inside the two limit sleeves.

[0007] Preferably, a sliding groove is formed in the side wall of the main support plate. Slide pins are symmetrically and fixedly connected to the side of the secondary support plate close to the main support plate. The secondary support plate is arranged between the two main support plates, and the two slide pins are respectively slidably connected inside the adjacent two sliding grooves.

[0008] Preferably, the locking and sealing assembly includes a positioning air bag fixedly sleeved on the surface of the test tube. Support rings are symmetrically and fixedly connected to the inner wall of the test tube. Torsion springs are fixedly connected to the opposite sides of the two support rings. One end of the torsion spring is fixedly connected to a cross-shaped rotating ring. Connecting rods are hinged to both ends of the cross-shaped rotating ring; An arc-shaped through groove matched with the connecting rod is formed in the surface of the test tube. One end of the connecting rod penetrates through the corresponding arc-shaped through groove and is hinged to an arc-shaped backing plate. The surface of the arc-shaped backing plate is fixedly connected to the inner wall of the positioning air bag.

[0009] Preferably, connecting bearings are symmetrically and fixedly sleeved on the surfaces of the telescopic adjusting rod and the rotating rod. The four connecting bearings correspond to the four cross-shaped rotating rings one by one. The inner ring of the cross-shaped rotating ring is fixedly connected to the outer ring of the corresponding connecting bearing; The two cross-shaped rotating rings are arranged with a 180-degree offset.

[0010] Preferably, the length of the arc-shaped through groove is set to 0.4 times the diameter of the test tube, and the distance between both ends of the cross-shaped rotating ring is set to 0.9 times the inner diameter of the test tube; An air delivery pipe is fixedly connected to the top of the right test tube. A pressure gauge is fixedly connected to the surface of the air delivery pipe.

[0011] Advantages of the present invention compared with the prior art: In the present invention, through the coordinated use of components such as a multi-stage pump casing, a test tube, and a hole sealing assembly, under the action of the hole sealing assembly, the position of the test tube in the inner cavity of the multi-stage pump casing can be quickly adjusted, and the positions of different cavities can be sealed and tested, so as to quickly and effectively locate the air leakage section, ensure the test accuracy, and the operation is convenient.

[0012] In the present invention, through the coordinated use of components such as a test tube, a hole sealing assembly, and a locking and sealing assembly, during the internal sealing test of the multi-stage pump casing, the positioning airbag on the locking and sealing assembly can expand and be restricted at the inner wall position of the multi-stage pump casing cavity, restricting the test tube at the shaft rod mounting hole, preventing the test tube from being ejected from the shaft rod mounting hole due to too high test air pressure, improving the test stability, and the expanded positioning airbag can further improve the sealing performance during the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a perspective view of the multi-stage pump casing and the test tube of the present invention; Figure 2 is a top cross-sectional view of the position of the multi-stage pump casing and the test tube of the present invention; Figure 3 is a perspective view of a partial position of the telescopic adjusting rod and the positioning airbag of the present invention; Figure 4 is a side cross-sectional view of a partial position of the sealing airbag and the adjusting disc of the present invention; Figure 5 is a cross-sectional view of a partial position of the test tube and the limit tooth rod of the present invention; Figure 6 is a side cross-sectional view of the position of the positioning airbag and the test tube of the present invention; Figure 7 is a perspective view of the torsion spring and the flat key-shaped rotating ring of the present invention; Figure 8 is a side cross-sectional view of a partial position of the main support plate and the secondary support plate of the present invention; Figure 9 is a side cross-sectional view of a partial position of the rotating rod and the telescopic adjusting rod of the present invention; Figure 10 is a side view of the limit tooth rod of the present invention.

[0014] In the figure: 1, multi-stage pump casing; 2, shaft rod mounting hole; 3, test tube; 4, hole sealing assembly; 401, telescopic adjusting rod; 402, rotating rod; 403, adjusting disc; 404, arc-shaped adjusting groove; 405, sealing airbag; 406, main support plate; 407, secondary support plate; 408, connecting rod; 409, limiting tooth rod; 410, limiting tooth block; 5, locking and sealing assembly; 501, positioning airbag; 502, support ring; 503, torsion spring; 504, flat ring; 505, connecting rod; 506, arc-shaped through groove; 507, arc-shaped backing plate. Detailed implementation mode

[0015] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0016] Please refer to Figures 1 to 10 , the present invention provides a technical solution: a centrifugal pump testing device, including: A multi-stage pump casing 1, a shaft rod mounting hole 2 is horizontally opened in the middle of the multi-stage pump casing 1, and test tubes 3 are movably inserted at both ends of the shaft rod mounting hole 2.

[0017] It further includes: A hole sealing assembly 4 is movably connected between the two test tubes 3, and the position of the shaft rod mounting hole 2 is sealed by the hole sealing assembly 4.

[0018] Locking and sealing assemblies 5 are movably connected to opposite ends of the two test tubes 3 and are matched with the hole sealing assembly 4. The locking and sealing assemblies 5 are used to lock the position of the hole sealing assembly 4.

[0019] In this embodiment, as Figures 1 to 10As shown in the figure, the hole sealing assembly 4 includes a telescopic adjusting rod 401. The telescopic adjusting rod 401 is rotatably connected inside the left test tube 3. A rotating rod 402 is rotatably connected inside the right test tube 3. The right end of the telescopic adjusting rod 401 is rotatably connected to the left end of the rotating rod 402. Adjusting disks 403 are fixedly sleeved on the surfaces of both the telescopic adjusting rod 401 and the rotating rod 402. Six arc-shaped adjusting grooves 404 are equidistantly arranged along the circumference on the surface of the adjusting disk 403. It should be noted that: the telescopic adjusting rod 401 is set as a multi-stage telescopic rod structure. An installation bearing is fixedly connected between the right end of the telescopic adjusting rod 401 and the left end of the rotating rod 402, so that the telescopic adjusting rod 401 and the rotating rod 402 will not interfere with each other during the rotation process. Through the setting of the telescopic adjusting rod 401, the left test tube 3 can move towards the position of the right test tube 3, so as to adjust the position of the sealing test of the internal cavity of the multi-stage pump housing 1; and positioning bearings are fixedly connected between the surfaces of both the telescopic adjusting rod 401 and the rotating rod 402 and the inner walls of the corresponding test tubes 3 to ensure the stability of the telescopic adjusting rod 401 and the rotating rod 402 during the rotation process.

[0020] Sealing air bags 405 are fixedly sleeved on the surfaces of both test tubes 3. The two sealing air bags 405 correspond to the two adjusting disks 403 one by one. Six main support plates 406 are equidistantly arranged along the circumference on the inner ring of the sealing air bag 405. A secondary support plate 407 is slidably connected between two adjacent main support plates 406. The surfaces of both the main support plate 406 and the secondary support plate 407 are fixedly connected to the inner wall of the sealing air bag 405. A connecting rod 408 is fixedly connected to the side of the main support plate 406 away from the sealing air bag 405. One end of the connecting rod 408 penetrates through the test tube 3 and is slidably connected inside the corresponding arc-shaped adjusting groove 404. It should be noted that: six jacks are equidistantly arranged along the circumference on the surface of the test tube 3. The two connecting rods 408 are respectively movably inserted inside the six jacks. An adjusting pin is fixedly connected to the end of the connecting rod 408 close to the adjusting disk 403. The connecting rod 408 is slidably connected inside the corresponding arc-shaped adjusting groove 404 through the adjusting pin.

[0021] Limit tooth rods 409 are slidably connected to the opposite ends of the telescopic adjusting rod 401 and the rotating rod 402. Limit tooth blocks 410 that cooperate with the limit tooth rods 409 are fixedly connected inside both test tubes 3. It should be noted that: guide groove holes are opened at the opposite ends of the telescopic adjusting rod 401 and the rotating rod 402. Guide blocks that cooperate with the guide groove holes are fixedly connected to the surface of the limit tooth rod 409. The guide blocks are slidably arranged inside the guide groove holes, so that the limit tooth rod 409 can drive the corresponding telescopic adjusting rod 401 or rotating rod 402 to rotate synchronously during the rotation process.

[0022] In this embodiment, as Figures 1 to 10As shown in the figure, an extrusion spring is fixedly connected to the surface of the limit tooth bar 409. Stop rings are fixedly sleeved on the ends of the telescopic adjustment rod 401 and the rotating rod 402. One end of the extrusion spring is lapped on the side wall of the stop ring. It should be noted that: the teeth on the limit tooth bar 409 are engaged and limited with the limit tooth block 410 by the extrusion of the extrusion spring, ensuring the stability of the telescopic adjustment rod 401 and the rotating rod 402 after rotation adjustment.

[0023] Limit sleeves are rotatably connected to the opposite ends of the two test tubes 3. The two limit tooth bars 409 are respectively inserted into the two limit sleeves movably. It should be noted that: a sealing bearing is fixedly connected between the outer ring of the limit sleeve and the surface of the test tube 3. The inner wall of the limit sleeve is a conical surface. A conical sealing pad is fixedly connected to the side of the limit tooth bar 409 close to the corresponding limit sleeve. Under the pressure of the extrusion spring, the conical sealing pad on the surface of the limit tooth bar 409 is inserted into the conical surface position of the inner wall of the limit sleeve, ensuring the sealing effect inside the test tube 3 during the test use process.

[0024] In this embodiment, as Figures 1 to 10 shown, a chute is opened on the side wall of the main support plate 406. Slide pins are symmetrically and fixedly connected to the side of the secondary support plate 407 close to the main support plate 406. The secondary support plate 407 is arranged between the two main support plates 406. The two slide pins are respectively slidably connected inside the adjacent two chutes. It should be noted that: when the six main support plates 406 expand or gather, during the sliding process of the cooperation between the chute and the slide pins, the six secondary support plates 407 expand and gather synchronously with the main support plates 406, and the side wall of the main support plate 406 is lapped with the side wall of the secondary support plate 407, ensuring that after the main support plate 406 drives the secondary support plate 407 to expand, the sealing airbag 405 can stably form a ring to seal the inner wall of the shaft rod mounting hole 2.

[0025] In this embodiment, as Figures 1 to 10 shown, the locking and sealing assembly 5 includes a positioning airbag 501. The positioning airbag 501 is fixedly sleeved on the surface of the test tube 3. Support rings 502 are symmetrically and fixedly connected to the inner wall of the test tube 3. Torsion springs 503 are fixedly connected to the opposite sides of the two support rings 502. One end of the torsion spring 503 is fixedly connected to a cross-shaped rotating ring 504. Connecting rods 505 are hinged to both ends of the cross-shaped rotating ring 504.

[0026] An arc-shaped through groove 506 that mates with the connecting rod 505 is provided on the surface of the test tube 3. One end of the connecting rod 505 passes through the corresponding arc-shaped through groove 506 and is hinged with an arc-shaped backing plate 507. The surface of the arc-shaped backing plate 507 is fixedly connected to the inner wall of the positioning airbag 501. It should be noted that: the two positioning airbags 501 are arranged between the two sealing airbags 405. When the positioning airbag 501 inflates with air intake and unfolds with the arc-shaped backing plate 507, the positioning airbag 501 can be restricted at the side wall position of the cavity inside the multi-stage pump housing 1, and the test tube 3 inside the shaft rod mounting hole 2 is limited, preventing the test tube 3 from being pushed out by excessive air pressure inside the multi-stage pump housing 1 and improving the test stability.

[0027] In this embodiment, as Figures 1 to 10 shown, connecting bearings are symmetrically and fixedly sleeved on the surfaces of the telescopic adjusting rod 401 and the rotating rod 402. The four connecting bearings correspond to the four one-shaped rotating rings 504 one by one. The inner ring of the one-shaped rotating ring 504 is fixedly connected to the outer ring of the corresponding connecting bearing. It should be noted that: the connecting bearings are provided so that when the telescopic adjusting rod 401 and the rotating rod 402 rotate, the one-shaped rotating ring 504 will not rotate along with it, and the positioning airbag 501 can only expand with the airflow.

[0028] The two one-shaped rotating rings 504 are arranged with a 180-degree offset.

[0029] In this embodiment, as Figures 1 to 10 shown, the length of the arc-shaped through groove 506 is set to 0.4 times the diameter of the test tube 3, and the distance between the two ends of the one-shaped rotating ring 504 is set to 0.9 times the inner diameter of the test tube 3. It should be noted that: the arc-shaped through groove 506 is provided so that when the one-shaped rotating ring 504 rotates back to its original position with the torsion spring 503, it can pull the arc-shaped backing plate 507 and the positioning airbag 501 to contract through the connecting rod 505. During this process, the movement of the connecting rod 505 will not interfere with the inner wall of the test tube 3.

[0030] The top of the right test tube 3 is fixedly connected with an air delivery pipe, and a pressure gauge is fixedly connected to the surface of the air delivery pipe. It should be noted that: it is connected to the air delivery pipe through an air pump for airtightness testing.

[0031] In this embodiment, as Figures 1 to 10 shown, a method for using a centrifugal pump testing device includes the following steps: S1. When in use, first insert the two test tubes 3 into the shaft mounting holes 2 inside the multistage pump housing 1, then press the two test tubes 3 respectively and press the corresponding limit gear rods 409 and rotate them, so that the two limit gear rods 409 rotate with the corresponding telescopic adjustment rods 401 and rotating rods 402. When the telescopic adjustment rods 401 and the rotating rods 402 rotate, the adjustment disks 403 on the surface rotate synchronously. At this time, the arc-shaped adjustment grooves 404 on the adjustment disks 403 cooperate with the end of the connecting rod 408 that is movably inserted inside the test tubes 3 to slide, so that the connecting rods 408 The six main support plates 406 move with the fixed connection. When the six main support plates 406 move in an expansion trend, the slave support plates 407 connected with the surface slidingly move synchronously, so that the six main support plates 406 cooperate with the six slave support plates 407 to form a ring to open the sealing airbag 405, so that the outer ring of the sealing airbag 405 fits the inner wall position of the shaft mounting hole 2. After the two sealing airbags 405 seal the two ends of the shaft mounting hole 2, the test gas is transported between the two test tubes 3 through the gas pipe to test the sealing performance of the entire cavity of the multi-stage pump housing 1; S2. When the test gas is delivered to the inside of the test tube 3, the test gas will enter the inside of the positioning airbag 501 from the arc-shaped slot 506. At this time, the positioning airbag 501 begins to expand, and the expanded positioning airbag 501 moves synchronously with the arc-shaped pad 507 fixedly connected to the inner wall, so that the arc-shaped pad 507 pulls the hinged connecting rod 505 to move, and one end of the connecting rod 505 rotates with the hinged straight-shaped swivel 504 at the side wall position corresponding to the support ring 502. At this time, after the expansion, The positioning airbag 501 with four arc-shaped pads 507 is synchronously unfolded to cover the shaft rod mounting hole 2. As the air pressure inside the multi-stage pump housing 1 increases, the air pressure presses the inflated positioning airbag 501 to fit tightly against the inner wall of the multi-stage pump housing 1, further improving the sealing during the test. At the same time, under the restriction of the inflated positioning airbag 501, the air pressure inside the multi-stage housing is prevented from being too high to push the sealed test tube 3 out of the shaft rod mounting hole 2, thereby ensuring the stability of the test. S3. When a gas leak occurs in the entire cavity of the multi-stage pump housing 1 during the test, the test gas is released from the gas pipe, and then the telescopic adjustment rod 401 is reversed to make the telescopic adjustment rod 401 and the adjustment disk 403 reset and rotate. At this time, the connecting rod 408 brings the main support plate 406 and the slave support plate 407 to reset and move, and the main support plate 406 and the slave support plate 407 bring the fixedly connected sealing airbag 405 to shrink and fit to the surface of the test tube 3. At the same time, as the test gas is discharged, the positioning airbag 501 stops expanding, and under the action of the torsion spring 503, it brings the straight-line swivel 504 to reverse at the side wall position of the corresponding support ring 502, and the connecting rods 505 at both ends of the straight-line swivel 504 pull the hinged arc pad 507 to move to the surface of the test tube 3, so that the positioning airbag 501 shrinks and fits to the surface of the test tube 3; S4. Then push the telescopic adjusting rod 401. The telescopic adjusting rod 401 drives the test tube 3 on the left side to move towards the test tube 3 on the right side, reducing the distance between the two test tubes 3. Then rotate the telescopic adjusting rod 401 to make the sealing airbag 405 expand again to seal the middle position of the shaft rod mounting hole 2, and repeat the above operations to retest the interior of the cavity of the multi-stage pump housing 1 after adjusting the position. When the test is normal, then drive the test tube 3 on the left side to move leftward at a fixed distance by the telescopic adjusting rod 401 and conduct tests in sequence. When a leakage condition is detected, the specific leakage section position of the multi-stage pump housing 1 can be determined.

[0032] The above shows and describes the basic principle, main features and advantages of the present invention. Technical staff in this industry should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification are only preferred examples of the present invention and are not used to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A centrifugal pump testing device, comprising: A multi-stage pump casing (1), wherein a shaft rod mounting hole (2) is transversely opened in the middle of the multi-stage pump casing (1), and test tubes (3) are movably inserted at both ends of the shaft rod mounting hole (2); It is characterized by further comprising: A hole sealing component (4) is movably connected between the two test tubes (3), and the position of the shaft rod mounting hole (2) is sealed by the hole sealing component (4); The two test tubes (3) are movably connected at opposite ends thereof with a locking sealing assembly (5) that matches the hole sealing assembly (4), and the locking sealing assembly (5) is used to lock the position of the hole sealing assembly (4).

2. A centrifugal pump testing device according to claim 1, characterized in that: The hole sealing assembly (4) comprises a telescopic adjustment rod (401), the telescopic adjustment rod (401) being rotatably connected to the inside of the left test tube (3), the inside of the right test tube (3) being rotatably connected to a rotating rod (402), the right end of the telescopic adjustment rod (401) being rotatably connected to the left end of the rotating rod (402), the surface of the telescopic adjustment rod (401) and the surface of the rotating rod (402) being fixedly sleeved with an adjustment disk (403), the surface of the adjustment disk (403) being provided with six arc-shaped adjustment grooves (404) equidistantly arranged along the circumference; The surfaces of the two test tubes (3) are fixedly sleeved with sealing airbags (405), the two sealing airbags (405) correspond to the two adjustment disks (403) one by one, the inner circle of the sealing airbag (405) is provided with six main support plates (406) equidistantly along the circumference, a secondary support plate (407) is slidably connected between two adjacent main support plates (406), the surfaces of the main support plates (406) and the surfaces of the secondary support plates (407) are both fixedly connected to the inner wall of the sealing airbag (405), a connecting rod (408) is fixedly connected to the side of the main support plate (406) away from the sealing airbag (405), and one end of the connecting rod (408) passes through the test tube (3) and is slidably connected to the inside of the corresponding arc-shaped adjustment groove (404); The ends of the telescopic adjustment rod (401) opposite to the rotating rod (402) are slidably connected to a limit gear rod (409), and the interiors of the two test tubes (3) are fixedly connected to a limit gear block (410) that matches the limit gear rod (409).

3. A centrifugal pump testing device according to claim 2, characterized in that: A compression spring is fixedly connected to the surface of the limit gear rod (409), and the ends of the telescopic adjustment rod (401) and the rotating rod (402) are fixedly sleeved with a retaining ring, and one end of the compression spring overlaps the side wall of the retaining ring; The ends of the two test tubes (3) facing away from each other are rotatably connected to the limiting sleeves, and the two limiting gear rods (409) are movably inserted into the interiors of the two limiting sleeves.

4. A centrifugal pump testing device according to claim 3, characterized in that: A sliding groove is provided on the side wall of the main support plate (406); a sliding pin is symmetrically fixedly connected to one side of the secondary support plate (407) close to the main support plate (406); the secondary support plate (407) is arranged between the two main support plates (406); and the two sliding pins are respectively slidably connected to the inside of two adjacent sliding grooves.

5. A centrifugal pump testing device according to claim 4, characterized in that: The locking seal assembly (5) comprises a positioning airbag (501), the positioning airbag (501) being fixedly sleeved on the surface of the test tube (3), the inner wall of the test tube (3) being symmetrically fixedly connected with a support ring (502), two opposite sides of the two support rings (502) being fixedly connected with a torsion spring (503), one end of the torsion spring (503) being fixedly connected with a straight-line swivel (504), and both ends of the straight-line swivel (504) being hinged with connecting rods (505); The surface of the test tube (3) is provided with an arc-shaped through groove (506) matching with the connecting rod (505); one end of the connecting rod (505) passes through the corresponding arc-shaped through groove (506) and is hingedly connected with an arc-shaped pad (507); the surface of the arc-shaped pad (507) is fixedly connected to the inner wall of the positioning airbag (501).

6. A centrifugal pump testing device according to claim 5, characterized in that: The surfaces of the telescopic adjustment rod (401) and the rotating rod (402) are both symmetrically and fixedly sleeved with connecting bearings, the four connecting bearings correspond to the four straight-line rotating rings (504) one by one, and the inner ring of the straight-line rotating ring (504) is fixedly connected to the outer ring of the corresponding connecting bearing; The two straight-line swivels (504) are staggered at 180 degrees.

7. A centrifugal pump testing device according to claim 6, characterized in that: The length of the arc-shaped through groove (506) is set to 0.4 times the diameter of the test tube (3), and the distance between the two ends of the straight-shaped rotating ring (504) is set to 0.9 times the inner diameter of the test tube (3); The top of the test tube (3) on the right side is fixedly connected to an air supply pipe, and the surface of the air supply pipe is fixedly connected to a pressure gauge.

8. A testing method for a centrifugal pump testing device, characterized in that: Using a centrifugal pump testing device as described in any one of claims 1 to 7 comprises the following steps: S1. When in use, first insert the two test tubes (3) into the shaft mounting hole (2) inside the multi-stage pump housing (1), then press the two test tubes (3) respectively, press the corresponding limit gear rods (409) and rotate them, so that the two limit gear rods (409) rotate with the corresponding telescopic adjustment rods (401) and the rotating rod (402), and under the action of the hole sealing component (4), the two sealing air bags (405) seal the two ends of the shaft mounting hole (2), and then the test gas is transported between the two test tubes (3) through the gas pipe to perform a sealing test on the entire cavity of the multi-stage pump housing (1); S2. When the test gas is delivered to the inside of the test tube (3), the locking seal assembly (5) causes the positioning airbag (501) to be inflated by the air pressure and closely fit against the inner wall of the multi-stage pump housing (1), thereby further improving the sealing performance and stability during the test; S3. When leakage occurs in the entire cavity of the multi-stage pump casing (1) during the test, the test gas is exhausted and the left test tube (3) is moved toward the right test tube (3) through the telescopic adjustment rod (401). The above operation is repeated and the cavity of the multi-stage pump casing (1) is tested again after the position is adjusted. The left test tube (3) is moved to the left at a fixed distance and the tests are performed in sequence. When leakage is detected, the specific leakage section position of the multi-stage pump casing (1) can be determined.

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