Centrifugal pump testing equipment and testing method

Abstract

The present invention relates to the field of centrifugal pump testing equipment, specifically a centrifugal pump testing equipment and testing method, comprising a multi-stage pump casing, wherein a shaft 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 mounting hole; further comprising: a hole sealing assembly movably connected between the two test tubes, and the position of the shaft mounting hole is sealed by the hole sealing assembly; and a locking sealing assembly that cooperates with the hole sealing assembly is movably connected at opposite ends of the two test tubes. This centrifugal pump testing equipment is composed of a hole sealing assembly and a locking sealing assembly. Through the coordinated use of components such as the multi-stage pump casing, the test tube and the hole sealing assembly, the position of the test tube in the inner cavity of the multi-stage pump casing can be quickly adjusted under the action of the hole sealing assembly, and sealing tests can be performed on the positions of different cavities, thereby quickly and effectively locating the leaking section, ensuring test accuracy and convenient operation.

Description

Technical Field

[0001] The present 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 generally 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 following problems exist in the use of existing centrifugal pump testing equipment and have not been well solved: 1. During use, some existing centrifugal pump testing equipment seals both ends of the shell, then supplies gas to the inside of the shell, and determines the internal sealing of 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 present invention aims to provide a centrifugal pump testing device and testing method to solve the problems raised in the above-mentioned background technology: 1. Some existing centrifugal pump testing devices have difficulty accurately locating the casing of the leaking section during the testing of a multi-stage centrifugal pump. To achieve the above-mentioned purpose, the present invention provides the following technical solutions: A centrifugal pump testing device, comprising:

[0005] A multi-stage pump casing, wherein a shaft 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 mounting hole;

[0006] Also includes:

[0007] 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;

[0008] One opposite end of each of the two test tubes is movably connected with a locking sealing assembly that matches the hole sealing assembly. The locking sealing assembly is used to lock the position of the hole sealing assembly.

[0009] Preferably, the hole sealing assembly includes a telescopic adjustment rod, the telescopic adjustment rod is rotatably connected to the interior of the left test tube, and the interior 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, and 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 slots equidistantly along the circumference;

[0010] The surfaces of the two test tubes are fixedly sleeved with sealing airbags, and the two sealing airbags correspond to the two adjustment disks one by one. The inner ring of the sealing airbag is provided with six main support plates at equal intervals along the circumference, and 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 both fixedly connected to the inner wall of the sealing airbag. A connecting rod is fixedly connected to the side of the main support plate away from the sealing airbag, and one end of the connecting rod passes through the test tube and is slidably connected to the inside of the corresponding arc-shaped adjustment groove;

[0011] The ends of the telescopic adjustment rod opposite to the rotating rod are both slidably connected to the limiting gear rod, and the interiors of the two test tubes are both fixedly connected to limiting gear blocks that match the limiting gear rod.

[0012] Preferably, a compression spring is fixedly connected to the surface of the position-limiting gear rod, and the ends of the telescopic adjustment rod and the rotating rod are fixedly sleeved with a retaining ring, and one end of the compression spring overlaps the side wall of the retaining ring;

[0013] The ends of the two test tubes facing away from each other are rotatably connected to the limiting sleeves, and the two limiting gear rods are movably inserted into the interiors of the two limiting sleeves.

[0014] Preferably, a sliding groove is provided on the side wall of the main support plate, and a sliding pin is symmetrically fixedly connected to the side of the slave support plate close to the main support plate. The slave support plate is arranged between the two main support plates, and the two sliding pins are respectively slidably connected to the inside of the two adjacent sliding grooves.

[0015] Preferably, the locking and sealing assembly includes a positioning airbag, which is fixedly sleeved on the surface of the test tube. The inner wall of the test tube is symmetrically fixedly connected to support rings, and two opposite sides of the support rings are fixedly connected to torsion springs, one end of the torsion spring is fixedly connected to a straight-shaped swivel, and both ends of the straight-shaped swivel are hinged to connecting rods;

[0016] The surface of the test tube is provided with an arcuate groove matching the connecting rod. One end of the connecting rod passes through the corresponding arcuate groove and is hinged with an arcuate pad. The surface of the arcuate pad is fixedly connected to the inner wall of the positioning airbag.

[0017] Preferably, the surfaces of the telescopic adjustment rod and the rotating rod are symmetrically fixed with connecting bearings, the four connecting bearings correspond one to one with the four I-shaped rotating rings, and the inner rings of the I-shaped rotating rings are fixedly connected to the outer rings of the corresponding connecting bearings;

[0018] The two straight-line swivels are staggered at 180 degrees.

[0019] 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 the two ends of the straight-shaped swivel is set to 0.9 times the inner diameter of the test tube;

[0020] The top of the test tube on the right is fixedly connected to an air supply pipe, and the surface of the air supply pipe is fixedly connected to an air pressure gauge.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] In the present invention, through the coordinated use of components such as the multi-stage pump casing, the test tube and the hole sealing assembly, the position of the test tube in the inner cavity of the multi-stage pump casing can be quickly adjusted under the action of the hole sealing assembly, and sealing tests can be performed on the positions of different cavities, thereby quickly and effectively locating the leaking section, ensuring test accuracy and convenient operation.

[0023] In the present invention, through the coordinated use of components such as the test tube, the hole sealing assembly and the locking sealing assembly, during the internal sealing test of the multi-stage pump casing, the positioning airbag on the locking sealing assembly can expand and be restricted to the inner wall position of the multi-stage pump casing cavity, thereby restricting the test tube at the shaft mounting hole, preventing the test air pressure from being too high and pushing the test tube out from the shaft mounting hole position, thereby improving the test stability, and the expanded positioning airbag can further improve the sealing during the test process. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A perspective view of the multi-stage pump casing and the test tube of the present invention;

[0025] Figure 2 A top cross-sectional view of the multi-stage pump casing and the test tube of the present invention;

[0026] Figure 3 A three-dimensional diagram of the telescopic adjustment rod and the local position of the positioning airbag of the present invention;

[0027] Figure 4 A side sectional view of a local position of the sealing airbag and the adjustment disk of the present invention;

[0028] Figure 5 A cross-sectional view of a local position of the test tube and the limiting gear rod of the present invention;

[0029] Figure 6 A side sectional view showing the positioning of the air bag and the test tube according to the present invention;

[0030] Figure 7 A perspective view of a torsion spring and a straight-shaped swivel according to the present invention;

[0031] Figure 8 It is a side cross-sectional view of a partial position of the main support plate and the secondary support plate of the present invention;

[0032] Figure 9 It is a side cross-sectional view of a local position of the rotating rod and the telescopic adjustment rod of the present invention;

[0033] Figure 10It is a side view of the limiting gear rod of the present invention.

[0034] In the figure: 1. Multi-stage pump casing; 2. Shaft mounting hole; 3. Test tube; 4. Hole sealing assembly; 401. Telescopic adjustment rod; 402. Rotating rod; 403. Adjustment disk; 404. Arc-shaped adjustment groove; 405. Sealing airbag; 406. Main support plate; 407. Slave support plate; 408. Connecting rod; 409. Limiting gear rod; 410. Limiting gear block; 5. Locking sealing assembly; 501. Positioning airbag; 502. Support ring; 503. Torsion spring; 504. I-shaped swivel; 505. Connecting rod; 506. Arc-shaped through groove; 507. Arc-shaped pad. DETAILED DESCRIPTION

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0036] See also Figures 1 to 10 The present invention provides a technical solution: a centrifugal pump testing device, comprising:

[0037] The multi-stage pump casing 1 has a shaft mounting hole 2 opened transversely in the middle of the multi-stage pump casing 1 , and test tubes 3 are movably inserted at both ends of the shaft mounting hole 2 .

[0038] Also includes:

[0039] A hole sealing assembly 4 is movably connected between the two test tubes 3 , and the position of the shaft mounting hole 2 is sealed by the hole sealing assembly 4 .

[0040] The two test tubes 3 are movably connected at opposite ends with a locking sealing component 5 that cooperates with the hole sealing component 4. The locking sealing component 5 is used to lock the position of the hole sealing component 4.

[0041] In this embodiment, Figures 1 to 10As shown, the hole sealing assembly 4 includes a telescopic adjustment rod 401, which is rotatably connected to the inside of the left test tube 3, and a rotating rod 402 is rotatably connected to the inside of the right test tube 3. The right end of the telescopic adjustment rod 401 is rotatably connected to the left end of the rotating rod 402. The surfaces of the telescopic adjustment rod 401 and the rotating rod 402 are fixedly sleeved with an adjustment disk 403, and the surface of the adjustment disk 403 is provided with six arc-shaped adjustment grooves 404 equidistantly along the circumference. It should be noted that: the telescopic adjustment rod 401 is set as a multi-stage telescopic rod structure, and a mounting bearing is fixedly connected between the right end of the telescopic adjustment rod 401 and the left end of the rotating rod 402, so that the telescopic adjustment rod 401 and the rotating rod 402 will not interfere with each other during rotation. Through the setting of the telescopic adjustment rod 401, the left test tube 3 can be moved toward the position of the right test tube 3, thereby adjusting the position of the sealing test of the internal cavity of the multi-stage pump casing 1; and the surfaces of the telescopic adjustment rod 401 and the rotating rod 402 are fixedly connected to the inner walls of the corresponding test tube 3 with positioning bearings to ensure the stability of the telescopic adjustment rod 401 and the rotating rod 402 during rotation.

[0042] A sealing airbag 405 is fixedly sleeved on the surface of each of the two test tubes 3. The two sealing airbags 405 correspond one-to-one with the two adjustment disks 403. Six main support plates 406 are equidistantly arranged along the circumference of the inner ring of the sealing airbag 405. A secondary support plate 407 is slidably connected between adjacent main support plates 406. The surfaces of the main support plates 406 and 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. 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. It should be noted that six equidistant sockets are provided on the surface of the test tube 3 along the circumference. The two connecting rods 408 are movably inserted into the six sockets. An adjustment pin is fixedly connected to the end of the connecting rod 408 near the adjustment disk 403. The connecting rod 408 is slidably connected to the inside of the corresponding arc-shaped adjustment groove 404 via the adjustment pin.

[0043] The ends of the telescopic adjustment rod 401 and the rotating rod 402 facing away from each other are slidably connected to a limit gear rod 409. A limit gear block 410 is fixedly connected to the interior of each of the two test tubes 3 and cooperates with the limit gear rod 409. It should be noted that the ends of the telescopic adjustment rod 401 and the rotating rod 402 facing away from each other are each provided with a guide slot. A guide block is fixedly connected to the surface of the limit gear rod 409 and cooperates with the guide slot. The guide block slides within the guide slot, allowing the limit gear rod 409 to rotate synchronously with the corresponding telescopic adjustment rod 401 or rotating rod 402 during rotation.

[0044] In this embodiment, Figures 1 to 10As shown, a compression spring is fixedly connected to the surface of the limit gear rod 409. A retaining ring is fixedly sleeved on the ends of the telescopic adjustment rod 401 and the rotating rod 402. One end of the compression spring overlaps the side wall of the retaining ring. It should be noted that the compression spring presses against the teeth on the limit gear rod 409, which cooperates with the limit tooth block 410 to limit the position, ensuring the stability of the telescopic adjustment rod 401 and the rotating rod 402 after rotational adjustment.

[0045] The opposing ends of the two test tubes 3 are rotatably connected to limit sleeves, and two limit gear rods 409 are movably inserted into the interiors of the two limit sleeves. It should be noted that a sealed 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 designed as a tapered surface. The side of the limit gear rod 409 closest to the corresponding limit sleeve is fixedly connected to a tapered sealing gasket. The compression spring forces the tapered sealing gasket on the surface of the limit gear rod 409 to insert into the tapered surface of the inner wall of the limit sleeve, ensuring a sealed effect inside the test tube 3 during testing.

[0046] In this embodiment, Figures 1 to 10 As shown, the sidewalls of the main support plates 406 are provided with sliding grooves, and a sliding pin is symmetrically fixedly connected to the side of the slave support plates 407 near the main support plates 406. The slave support plates 407 are arranged between the two main support plates 406, and the two sliding pins are slidably connected to the interiors of the two adjacent sliding grooves. It should be noted that when the six main support plates 406 expand or converge, the six slave support plates 407 expand and converge synchronously with the main support plates 406 during the sliding cooperation of the sliding grooves and the sliding pins, and the sidewalls of the main support plates 406 overlap the sidewalls of the slave support plates 407, ensuring that after the main support plates 406 expand with the slave support plates 407, the sealing airbag 405 can stably form a ring to seal the inner wall of the shaft mounting hole 2.

[0047] In this embodiment, Figures 1 to 10 As shown, the locking sealing assembly 5 includes a positioning airbag 501, which is fixedly sleeved on the surface of the test tube 3. The inner wall of the test tube 3 is symmetrically fixedly connected with a support ring 502, and the two support rings 502 are fixedly connected to the opposite sides with a torsion spring 503. One end of the torsion spring 503 is fixedly connected to a straight-line swivel 504, and both ends of the straight-line swivel 504 are hinged with a connecting rod 505.

[0048] The surface of the test tube 3 is provided with an arcuate through-slot 506 that mates with the connecting rod 505. A curved pad 507 is hingedly connected to one end of the connecting rod 505, extending through the corresponding arcuate through-slot 506. The surface of the curved pad 507 is fixedly connected to the inner wall of the positioning airbag 501. It should be noted that the two positioning airbags 501 are disposed between the two sealing airbags 405. When the positioning airbags 501 are inflated by air and expand with the curved pad 507, they can be confined to the sidewall of the cavity within the multi-stage pump housing 1, limiting the position of the test tube 3 within the shaft mounting hole 2, preventing the test tube 3 from being ejected due to excessive air pressure within the multi-stage pump housing 1, and improving testing stability.

[0049] In this embodiment, Figures 1 to 10 As shown, connecting bearings are symmetrically fixedly mounted on the surfaces of the telescopic adjustment rod 401 and the rotating rod 402. The four connecting bearings correspond one-to-one with the four straight-line swivels 504. The inner rings of the straight-line swivels 504 are fixedly connected to the outer rings of the corresponding connecting bearings. It should be noted that the connecting bearings are arranged so that when the telescopic adjustment rod 401 and the rotating rod 402 rotate, the straight-line swivels 504 do not rotate with them, allowing the positioning airbag 501 to expand only with the airflow.

[0050] The two straight-line swivels 504 are staggered 180 degrees.

[0051] In this embodiment, Figures 1 to 10 As shown, the length of the arcuate slot 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 swivel 504 is set to 0.9 times the inner diameter of the test tube 3. It should be noted that the arcuate slot 506 is configured so that when the straight-shaped swivel 504 rotates in response to the return of the torsion spring 503, the arcuate pad 507 and the positioning airbag 501 can be pulled together by the connecting rod 505 to contract. During this process, the movement of the connecting rod 505 does not interfere with the inner wall of the test tube 3.

[0052] The top of the right test tube 3 is fixedly connected to an air supply pipe, and the surface of the air supply pipe is fixedly connected to an air pressure gauge. It should be noted that an air pump is connected to the air supply pipe to perform an air tightness test.

[0053] In this embodiment, Figures 1 to 10 As shown, a method for using a centrifugal pump testing device includes the following steps:

[0054] S1. When in use, first insert the two test tubes 3 into the shaft mounting holes 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 rotating rods 402. When the telescopic adjustment rods 401 and rotating rods 402 rotate, the adjustment disk 403 on the surface rotates synchronously. At this time, the arc-shaped adjustment groove 404 on the adjustment disk 403 cooperates with the end of the connecting rod 408 that is inserted into the test tubes 3 to slide, so that the connecting rod 408 The six main support plates 406 move with the fixed connection. When the six main support plates 406 move in an expanding trend, the six main support plates 406 will move synchronously with the six slave support plates 407 that are slidingly connected on the surface, so that the six main support plates 406 and the six slave support plates 407 cooperate to form a ring to expand 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 perform a sealing test on the entire cavity of the multi-stage pump housing 1;

[0055] S2. When the test gas is delivered to the inside of the test tube 3, the test gas will enter the interior of the positioning airbag 501 from the arc-shaped slot 506. At this time, the positioning airbag 501 begins to expand. 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 ring 504 at the side wall position corresponding to the support ring 502. The positioning airbag 501 with four arc-shaped pads 507 is synchronously unfolded to block the position of the shaft 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, which may cause the sealed test tube 3 to be pushed out of the shaft mounting hole 2, thereby ensuring the stability of the test.

[0056] S3. When a gas leak occurs in the entire cavity of the multi-stage pump casing 1 during the test, the test gas is released from the gas pipe position, and then the telescopic adjustment rod 401 is reversed, so that the telescopic adjustment rod 401 and the adjustment disk 403 are reset and rotated. 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 position of the side wall 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 toward the surface of the test tube 3, so that the positioning airbag 501 shrinks and fits to the surface of the test tube 3;

[0057] S4. Then push the telescopic adjustment rod 401, and the telescopic adjustment rod 401 moves the test tube 3 on the left toward the test tube 3 on the right, so that the distance between the two test tubes 3 is reduced. Then, rotate the telescopic adjustment rod 401 to expand the sealing airbag 405 again to seal the middle position of the shaft mounting hole 2, and repeat the above operation. Re-test the interior of the cavity of the multi-stage pump casing 1 after the position adjustment. When the test is normal, the telescopic adjustment rod 401 is used to move the test tube 3 on the left to the left at a fixed distance, and test it in turn. When a leakage condition is detected, the specific leakage section position of the multi-stage pump casing 1 can be determined.

[0058] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely preferred examples of the present invention and are not intended to limit the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and modifications fall within the scope of the present invention. The scope of protection claimed in 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 mounting hole (2) is transversely opened in the middle of the multi-stage pump casing (1), and test tubes (3) are movably connected to both ends of the shaft 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 to a locking sealing assembly (5) that cooperates with the hole sealing assembly (4), and the locking sealing assembly (5) is used to lock the position of the hole sealing assembly (4); The hole sealing assembly (4) includes a telescopic adjustment rod (401), the telescopic adjustment rod (401) is rotatably connected to the inside of the left test tube (3), the inside of the right test tube (3) is rotatably connected to a rotating rod (402), the right end of the telescopic adjustment rod (401) is 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) are both fixedly sleeved with an adjustment disk (403), and the surface of the adjustment disk (403) is provided with six arc-shaped adjustment grooves (404) equidistantly along the circumference; The surfaces of the two test tubes (3) are fixedly sleeved with sealing airbags (405), and the two sealing airbags (405) correspond to the two adjustment disks (403) one by one. Six main support plates (406) are equidistantly arranged along the circumference of the inner circle of the sealing airbag (405), and 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) and the rotating rod (402) opposite to each other are both slidably connected to a limit gear rod (409), and the interiors of the two test tubes (3) are both fixedly connected to a limit gear block (410) that matches the limit gear rod (409).

2. A centrifugal pump testing device according to claim 1, characterized in that: The surface of the limiting gear rod (409) is fixedly connected to a compression spring, 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 is overlapped on the side wall of the retaining ring; The opposite ends of the two test tubes (3) are both rotatably connected to the limiting sleeves, and the two limiting gear rods (409) are movably inserted into the interiors of the two limiting sleeves.

3. A centrifugal pump testing device according to claim 2, characterized in that: A sliding groove is provided on the side wall of the main support plate (406), and 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.

4. A centrifugal pump testing device according to claim 3, characterized in that: The locking sealing 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 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 a connecting rod (505); The surface of the test tube (3) is provided with an arcuate through groove (506) that matches the connecting rod (505), and one end of the connecting rod (505) passes through the corresponding arcuate through groove (506) and is hingedly connected to an arcuate pad (507), and the surface of the arcuate pad (507) is fixedly connected to the inner wall of the positioning airbag (501).

5. A centrifugal pump testing device according to claim 4, 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 one to one with the four I-shaped rotating rings (504), and the inner rings of the I-shaped rotating rings (504) are fixedly connected to the outer rings of the corresponding connecting bearings; The two straight-shaped rotating rings (504) are staggered at 180 degrees.

6. A centrifugal pump testing device according to claim 5, 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 swivel (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 an air pressure gauge.

7. A method for using a centrifugal pump testing device, characterized in that: Using a centrifugal pump testing device according to any one of claims 1 to 6 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 positioning airbag (501) is tightly fitted to the inner wall of the multi-stage pump housing (1) under the action of the locking seal assembly (5), which further improves the sealing and stability during the test process; S3. When a gas leak occurs in the entire cavity of the multi-stage pump casing (1), 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) after the position adjustment is retested. The left test tube (3) is moved to the left at a fixed distance and the tests are carried out in sequence. When a gas leak is detected, the specific location of the gas leak section of the multi-stage pump casing (1) can be determined.

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