Vortex pump impeller assembly and clearance control device and assembly and clearance control method

Abstract

The present invention belongs to a vortex pump impeller assembly and clearance control device in the technical field of vortex pumps, and the present invention also relates to a vortex pump impeller assembly and clearance control method. An inner platform I (20) is arranged at the center position of the lower end face of the impeller head (13) of the vortex pump impeller assembly and clearance control device, an outer platform II (21) is arranged at the outer ring position of the lower end face of the impeller head (13), there is an impeller head height difference H1 between the inner platform I (20) and the outer platform II (21), a support seat inner hole (17) is arranged at the lower part of the support seat (14), a cushion block (15) is arranged in the support seat inner hole (17), and an adjusting block (16) is arranged below the cushion block (15). The vortex pump impeller assembly and clearance control device and the vortex pump impeller assembly and clearance control method of the present invention improve the clearance control accuracy, facilitate the accurate realization of impeller assembly, avoid the bearing from bearing axial force, and improve the performance.

Description

Technical Field

[0001] The present invention belongs to the technical field of vortex pumps. More specifically, it relates to a vortex pump impeller assembly and clearance control device, and the present invention also relates to a vortex pump impeller assembly and clearance control method. Background Art

[0002] A vortex pump is a mechanical device that relies on the rotation of an impeller to transport a medium. To ensure the normal rotation of the impeller without rubbing against the housing, sufficient clearance needs to be maintained between the impeller and the housing; to prevent medium leakage to improve transmission efficiency, the clearance between the impeller and the housing should be as small as possible; in addition, to ensure the consistency of flow rate, the tolerance of the clearance needs to be as small as possible. In the existing vortex pumps, since the impeller pressing is generally the last step of the process, at this time, the bearings have been installed on the shaft and the housing. Due to the existence of design tolerances and assembly tolerances, the height difference between the shaft end and the housing end face is not a fixed value, and general support tooling cannot support the housing and the shaft end at the same time, resulting in an excessive clearance error between the impeller and the housing. Therefore, under the action of the pressing force, the bearings will all bear axial forces (when supporting the housing, the inner ring of the bearing moves with the shaft to generate an axial force; when supporting the shaft end, the outer ring of the bearing moves with the housing to generate an axial force). Especially for deep groove ball bearings, it will cause damage to the bearings, which will increase the vibration and noise of the product at least, and affect the product life at worst. Summary of the Invention

[0003] The technical problem to be solved by the present invention is: aiming at the deficiencies of the prior art, to provide a vortex pump impeller assembly and clearance control device with a simple structure, which, for the problem of poor control of the impeller assembly clearance, combines the assembly method and dimensional chain calculation to reduce the dimensional chain, reduce the clearance tolerance value, improve the clearance control accuracy, facilitate the accurate realization of impeller assembly, and accurately control the clearance tolerance during the assembly process to avoid the bearings from bearing axial forces and improve the product performance.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0005] The present invention is a vortex pump impeller assembly and clearance control device, which includes an impeller press head 13, a support seat 14, a spacer 15, an adjustment block 16, and a long screw 19. At the center position of the lower end face of the impeller press head 13, an inner platform Ⅰ 20 is provided, and at the outer ring position of the lower end face of the impeller press head 13, an outer platform Ⅱ 21 is provided. There is an impeller press head height difference H1 between the inner platform Ⅰ 20 and the outer platform Ⅱ 21. A support seat inner hole 17 is provided at the lower part of the support seat 14. A spacer 15 is arranged in the support seat inner hole 17. An adjustment block 16 is arranged below the spacer 15. The lower surface of the spacer 15 is a ramp surface structure, and the upper surface of the adjustment block 16 is a ramp surface structure. The long screw 19 installed on the support seat 14 is screwed into the threaded hole of the adjustment block 16.

[0006] A support seat cross-hole 18 parallel to the bottom end face 22 of the support seat is provided on the support seat 14, and the support seat cross-hole 18 communicates with the support seat inner hole 17.

[0007] The long screw 19 passes through the support seat cross-hole 18 and extends into the support seat inner hole 17. The long screw 19 is also movably connected to the support seat connection position 23 outside the support seat cross-hole 18. The long screw 19 is configured to be able to rotate relative to the support seat connection position 23 but not move laterally.

[0008] The vortex pump includes a pump body 4, a cover plate 1, an impeller 3, and a motor 7. The motor 7 includes a motor rotor shaft 6. The cover plate 1 is connected to one end of the pump body 4, and the motor 7 is connected to the other end of the pump body 4. A medium chamber 2 is formed between the cover plate 1 and the pump body 4. The impeller 3 is installed on the motor rotor shaft 6 and is located in the medium chamber 2.

[0009] Axial clearances A1 and A2 are formed between the impeller 3 and the pump body 4, and axial clearances B1 and B2 are formed between the impeller 3 and the cover plate 1.

[0010] The pump body 4 includes a pump body height difference H2 and a pump body height difference H3, and the cover plate 1 includes a cover plate height difference H6 and a cover plate height difference H7.

[0011] When the vortex pump impeller assembly and clearance control device assembles the impeller, the adjusting block 16 is located in the support seat inner hole 17, the spacer block 15 supports on the adjusting block 16, the lower end face of the motor rotor shaft 6 is located above the spacer block 15. When a force is applied to the impeller press head 13, the inner platform Ⅰ20 of the impeller press head 13 contacts the impeller 3 and the outer platform Ⅱ21 contacts the upper end face of the pump body 4 and then stops moving, completing the assembly of the impeller 3.

[0012] When the vortex pump impeller assembly and clearance control device assembles the impeller, there is a clearance C between the inner bottom surface 24 of the support seat of the support seat 14 and the lower end face of the motor rotor shaft 6.

[0013] The axial clearance A1 is composed of the impeller 3 and the pump body partition 9, and the axial clearance B1 is composed of the impeller 3 and the cover plate partition 10; the axial clearance A2 is composed of the impeller 3 and the pump body boss 11, and the axial clearance B2 is composed of the impeller 3 and the cover plate boss 12.

[0014] The present invention also relates to a vortex pump impeller assembly and clearance control method with simple steps. Aiming at the problem of poor control of the impeller assembly clearance, by combining the assembly method and dimensional chain calculation, the dimensional chain is reduced, the clearance tolerance value is lowered, the clearance control accuracy is improved, the impeller assembly can be conveniently and accurately realized, and the clearance tolerance can be accurately controlled during the assembly process, avoiding the bearing from bearing axial force and improving the product performance. The steps of the vortex pump impeller assembly and clearance control method are as follows:

[0015] The adjusting block 16 is located within the inner hole 17 of the support seat. The cushion block 15 is supported on the adjusting block 16, and the lower end face of the motor rotor shaft 6 is positioned above the cushion block 15.

[0016] S2. The axial clearances A1 and A2 are controlled by the height difference H1 of the impeller head, the height difference H2 of the pump body, or the height difference H3 of the pump body, the height difference H4 of the impeller, or the height difference H5 of the impeller. The axial clearances B1 and B2 are controlled by the height difference H6 of the cover plate or the height difference H7 of the cover plate.

[0017] S3. Before pressing the impeller 3 onto the impeller head 13 by applying force, rotate the long screw 19. The long screw 19 moves relative to the support seat 14 and pushes the adjusting block 16 to move. Under the combined action of the inclined plane of the adjusting block 16 and the inclined plane of the cushion block 15, the cushion block 15 is pushed upward to abut against the lower end face of the motor rotor shaft 6.

[0018] S4. Apply force to the impeller head 13 until the inner platform Ⅰ 20 of the impeller head 13 contacts the impeller 3 and the outer platform Ⅱ 21 contacts the upper end face of the pump body 4, completing the assembly of the impeller 3, and the gap control is achieved during the assembly process.

[0019] Adopting the technical solution of the present invention, the working principle and beneficial effects are as described below:

[0020] The vortex pump impeller assembly and gap control device and the vortex pump impeller assembly and gap control method of the present invention, the steps of assembly and gap control are as follows: the adjustment block is located in the inner hole of the support seat, the cushion block is supported on the adjustment block, and the lower end surface of the motor rotor shaft is located above the cushion block; the axial gap A1 and the axial gap A2 are controlled by the impeller pressure head height difference H1, the pump body height difference H2 or the pump body height difference H3, the impeller height difference H4 or the impeller height difference H5; the axial gap B1 and the axial gap The gap B2 is controlled by the cover plate height difference H6 or the cover plate height difference H7; before applying force on the impeller pressure head to press the impeller, rotate the long screw, the long screw moves relative to the support seat and pushes the adjusting block to move, and the inclined surface of the adjusting block and the inclined surface of the cushion block cooperate to push the cushion block to move upward, and the cushion block supports the lower end surface of the motor rotor shaft; apply force to the impeller pressure head until the inner platform I of the impeller pressure head contacts the impeller and the outer platform II contacts the upper end surface of the pump body, the impeller assembly is completed, and the gap control is achieved during the assembly process. On the one hand, for impeller clearance control, by combining the assembly method with the dimension chain calculation, the impeller pressure head height difference H1 and the limit method pressing method are utilized to effectively reduce the dimension chain length, especially avoid the bearing clearance factor, reduce the tolerance range of the clearance, and effectively improve the flow consistency; on the other hand, for impeller assembly, the assembly and clearance control device of the present invention is adopted, and the support seat, the spacer block and the adjustment block are used in combination, especially the conical surface design of the spacer block and the adjustment block is utilized to effectively compensate for the inconsistency of the height difference between the shaft end and the housing, ensure that the housing and the shaft end are used as support surfaces at the same time, avoid the bearing from being subjected to axial force, and improve the performance and life of the bearing and the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The following is a brief description of the contents and symbols in the drawings of this specification:

[0022] Figure 1 It is a schematic diagram of the structure of the vortex pump of the present invention;

[0023] Figure 2 It is a structural schematic diagram of the pump body of the vortex pump described in the present invention;

[0024] Figure 3 It is a structural schematic diagram of the cover plate of the vortex pump according to the present invention;

[0025] Figure 4 It is a schematic diagram of the structure of the vortex pump impeller assembly and the clearance control device of the present invention when in use;

[0026] Figure 5 It is a partial enlarged structural schematic diagram of the impeller clearance of the vortex pump according to the present invention;

[0027] Figure 6 It is a structural schematic diagram of the impeller pressure head of the present invention;

[0028] Figure 7 Schematic diagram of the mating structure of the spacer block and the adjusting block according to the present invention;

[0029] The labels in the drawings are respectively: 1. Cover plate; 2. Medium cavity; 3. Impeller; 4. Pump body; 5. Pump body bearing; 6. Motor rotor shaft; 7. Motor; 8. Motor bearing; 9. Pump body partition; 10. Cover plate partition; 11. Pump body boss; 12. Cover plate boss; 13. Impeller head; 14. Support seat; 15. Spacer block; 16. Adjusting block; 17. Inner hole of the support seat; 18. Transverse hole of the support seat; 19. Long screw; 20. Inner platform I; 21. Outer platform II; 22. Bottom end face of the support seat; 23. Connection position of the support seat; 24. Inner bottom surface of the support seat.

[0030] Axial clearance A1; Axial clearance A2; Axial clearance B1; Axial clearance B2; Clearance C;

[0031] Height difference H1; Height difference H2; Height difference H3; Height difference H4; Height difference H5; Height difference H6; Height difference H7. Specific embodiments

[0032] The following is a further detailed description of the specific embodiments of the present invention, such as the shapes, structures of the various components involved, the mutual positions and connection relationships between the various parts, the functions of the various parts, and the working principles, etc., with reference to the drawings and through the description of the embodiments:

[0033] As shown in the attached Figure 1 - attached Figure 7As shown, the present invention is a vortex pump impeller assembly and clearance control device, including an impeller pressure head 13, a support seat 14, a cushion block 15, an adjustment block 16, and a long screw 19. An inner platform Ⅰ20 is arranged at the center of the lower end surface of the impeller pressure head 13, and an outer platform Ⅱ21 is arranged at the outer ring position of the lower end surface of the impeller pressure head 13. There is an impeller pressure head height difference H1 between the inner platform Ⅰ20 and the outer platform Ⅱ21. A support seat inner hole 17 is arranged at the lower part of the support seat 14, and a cushion block 15 is arranged in the support seat inner hole 17. An adjustment block 16 is arranged below the cushion block 15. The lower surface of the cushion block 15 is a slope surface structure, and the upper surface of the adjustment block 16 is a slope surface structure. The long screw 19 installed on the support seat 14 is screwed into the threaded hole of the adjustment block 16. The above structure proposes an improved technical solution to the deficiencies in the prior art. In vortex pumps, in order to ensure reasonable clearance requirements, general products are controlled from the direction of design dimensional tolerances, and the dimension chain calculation is required. At least the following tolerances need to be considered: shaft length tolerance, housing height tolerance, impeller width, bearing axial clearance, etc. The dimension chain involved is relatively long, especially the bearing axial clearance tolerance is relatively large, resulting in a larger axial clearance tolerance range between the impeller and the housing, which is not conducive to clearance control. The steps for assembly and clearance control are as follows: the adjustment block 16 is located in the inner hole 17 of the support seat, the cushion block 15 is supported on the adjustment block 16, and the lower end face of the motor rotor shaft 6 is located above the cushion block 15; the axial clearance A1 and the axial clearance A2 are controlled by the impeller pressure head height difference H1, the pump body height difference H2 or the pump body height difference H3, the impeller height difference H4 or the impeller height difference H5; the axial clearance B1 and the axial clearance B2 are controlled by the cover plate height difference H6 or the cover plate height difference H7; the force is applied to the impeller Before the impeller 3 is pressed onto the pressure head 13, the long screw 19 is rotated. The long screw 19 moves relative to the support seat 14 and pushes the adjusting block 16 to move. The inclined surface of the adjusting block 16 and the inclined surface of the cushion block 15 cooperate to push the cushion block 15 to move upward, and the cushion block 15 supports the lower end surface of the motor rotor shaft 6. Force is applied to the impeller pressure head 13 until the inner platform Ⅰ20 of the impeller pressure head 13 contacts the impeller 3 and the outer platform Ⅱ21 contacts the upper end surface of the pump body 4. The assembly of the impeller 3 is completed, and the gap control is achieved during the assembly process. The present invention proposes a new assembly and clearance control tool and an assembly and clearance control method. On the one hand, for impeller clearance control, by combining the assembly method with the dimension chain calculation, the impeller pressure head height difference H1 and the limit method pressing method are utilized to effectively reduce the dimension chain length, especially avoid the bearing clearance factor, reduce the tolerance range of the clearance, and effectively improve the flow consistency; on the other hand, for the impeller assembly requirements, the assembly and clearance control device of the present invention is adopted, and the support seat, the cushion block and the adjustment block are used in combination, especially the conical surface design of the cushion block and the adjustment block is utilized to effectively compensate for the inconsistency of the height difference between the shaft end and the shell, ensure that the shell and the shaft end are used as support surfaces at the same time, avoid the bearing from being subjected to axial force, and improve the overall performance and life of the bearing and turbine pump products.

[0034] A support seat cross hole 18 parallel to the bottom end face 22 of the support seat is provided on the described support seat 14, and the support seat cross hole 18 communicates with the support seat inner hole 17. The long screw 19 passes through the support seat cross hole 18 and extends into the support seat inner hole 17. The long screw 19 is also movably connected to the support seat connection position 23 outside the support seat cross hole 18. The long screw 19 is configured to be able to rotate relative to the support seat connection position 23 but not move laterally. With the above structure, the support seat cross hole 18 is used to accommodate the long screw, and the long screw is installed at the support seat connection position 23 and can only rotate relative to the support seat connection position 23 and cannot move vertically relative to the support seat connection position 23. In this way, it is ensured that when the long screw rotates in different directions, it can drive the adjusting block to move in different directions. When the adjusting block moves, using the inclined plane, it drives the height of the cushion block to change, supporting the motor rotor shaft.

[0035] The described vortex pump includes a pump body 4, a cover plate 1, an impeller 3, and a motor 7. The motor 7 includes a motor rotor shaft 6. The cover plate 1 is connected to one end of the pump body 4, and the motor 7 is connected to the other end of the pump body 4. A medium chamber 2 is formed between the cover plate 1 and the pump body 4. The impeller 3 is installed on the motor rotor shaft 6 and is located in the medium chamber 2. With the above structure, the vortex pump includes a pump body and a cover plate. The inside of the pump body and the cover plate is a medium chamber. An impeller is provided in the medium chamber. The impeller is installed on the motor rotor shaft by interference fit. The motor rotor shaft is fixed by bearings. The impeller rotates under the drive of the motor and transports the medium (liquid or gas). Axial clearances A1 and A2 are reserved between the impeller 3 and the pump head, and axial clearances B1 and B2 are reserved between the impeller and the cover plate to meet the functional use requirements.

[0036] Axial clearances A1 and A2 are formed between the described impeller 3 and the pump body 4, and axial clearances B1 and B2 are formed between the impeller 3 and the cover plate 1. The pump body 4 includes a pump body height difference H2 and a pump body height difference H3, and the cover plate 1 includes a cover plate height difference H6 and a cover plate height difference H7. With the above structure, according to the height differences of each part of the vortex pump and the dimensions of each axial clearance, the structure of the vortex pump impeller assembly and clearance control device and the height difference values of each part are set. In this way, when the vortex pump impeller assembly and clearance control are required, only the impeller pressing head needs to act on the impeller, and then force is applied to the impeller pressing head until the inner platform Ⅰ20 of the impeller pressing head 13 contacts the impeller 3 and the outer platform Ⅱ21 contacts the upper end face of the pump body 4 and then stops moving, completing the assembly of the impeller 3, and the axial clearance of the assembled impeller fully meets the tolerance and performance requirements.

[0037] When assembling the impeller of the described vortex pump impeller assembly and clearance control device, the adjusting block 16 is located within the inner hole 17 of the support seat. The spacer 15 is supported on the adjusting block 16, and the lower end face of the motor rotor shaft 6 is positioned above the spacer 15. When applying force to the impeller head 13, the inner platform I 20 of the impeller head 13 contacts the impeller 3 and the outer platform II 21 contacts the upper end face of the pump body 4 and then stops moving, completing the assembly of the impeller 3, and the clearance of the impeller meets the tolerance requirements. In this way, the assembly of the impeller and the control of the clearance are effectively simplified, and the accuracy is effectively guaranteed. For different models and sizes of turbine pumps, only by machining devices with different height difference requirements can the assembly of the impeller and the motor rotor shaft be conveniently and labor-savingly completed, efficiently, accurately, and reliably.

[0038] When assembling the impeller of the described vortex pump impeller assembly and clearance control device, there is a clearance C between the inner bottom surface 24 of the support seat of the support seat 14 and the lower end face of the motor rotor shaft 6.

[0039] The described axial clearance A1 is composed of the impeller 3 and the pump body partition 9, and the axial clearance B1 is composed of the impeller 3 and the cover partition 10; the described axial clearance A2 is composed of the impeller 3 and the pump body boss 11, and the axial clearance B2 is composed of the impeller 3 and the cover boss 12.

[0040] In the above structure, the described axial clearance A1 is composed of the impeller and the pump body partition, and the axial clearance B1 is composed of the impeller and the cover partition. The axial clearances A1 and B1 reduce the leakage of the outlet medium to the inlet while ensuring the normal rotation of the impeller. The axial clearance A2 is composed of the impeller and the pump body boss, and the axial clearance B2 is composed of the impeller and the cover boss. The axial clearances A2 and B2 reduce the leakage of the medium into the motor while ensuring the normal rotation of the impeller.

[0041] The present invention also relates to a vortex pump impeller assembly and clearance control method with simple steps. Aiming at the problem of poor control of the impeller assembly clearance, by combining the assembly method and the dimensional chain calculation, the dimensional chain is reduced, the clearance tolerance value is lowered, the clearance control accuracy is improved, the impeller assembly is conveniently and accurately realized, and the clearance tolerance is accurately controlled during the assembly process to avoid the bearing from bearing axial force and improve the product performance. The steps of the described vortex pump impeller assembly and clearance control method are as follows:

[0042] S1. The adjusting block 16 is located in the inner hole 17 of the support seat, the cushion block 15 is supported on the adjusting block 16, and the lower end surface of the motor rotor shaft 6 is located above the cushion block 15; S2. The axial clearance A1 and the axial clearance A2 are controlled by the impeller pressure head height difference H1, the pump body height difference H2 or the pump body height difference H3, the impeller height difference H4 or the impeller height difference H5; the axial clearance B1 and the axial clearance B2 are controlled by the cover plate height difference H6 or the cover plate height difference H7; S3. Before applying force on the impeller pressure head 13 to press the impeller 3, rotate the long screw 19, and the long screw 19 moves relative to the support seat 14 to push the adjusting block 16 to move, and the cushion block 15 is pushed upward under the cooperation of the slope surface of the adjusting block 16 and the slope surface of the cushion block 15, and the cushion block 15 supports the lower end surface of the motor rotor shaft 6. S4. Apply force to the impeller pressure head 13 until the inner platform Ⅰ20 of the impeller pressure head 13 contacts the impeller 3 and the outer platform Ⅱ21 contacts the upper end surface of the pump body 4, completing the assembly of the impeller 3, and realizing the gap control during the assembly process. The vortex pump impeller assembly and gap control device and the vortex pump impeller assembly and gap control method described in the present invention aim at the problem of poor gap control in impeller assembly, reduce the size chain, reduce the gap tolerance value, improve the gap control accuracy, facilitate and accurately realize the impeller assembly, and accurately control the gap tolerance during the assembly process, avoid bearing axial force, and improve product performance.

[0043] The vortex pump impeller assembly and gap control device and vortex pump impeller assembly and gap control method described in the present invention aim at the deficiencies in the prior art and propose improvements. On the one hand, for the impeller gap control, by combining the assembly method with the dimension chain calculation, the impeller pressure head height difference H1 and the limit method pressing method are used to effectively reduce the length of the dimension chain, especially to avoid the bearing clearance factor, reduce the tolerance range of the gap, and effectively improve the flow consistency; on the other hand, for the impeller assembly, the assembly and gap control device of the present invention is adopted, and the support seat, the gasket and the adjustment block are used in combination, especially the conical surface design of the gasket and the adjustment block is used to effectively compensate for the inconsistency of the height difference between the shaft end and the housing, ensure that the housing and the shaft end are used as support surfaces at the same time, avoid the bearing from bearing axial force, and improve the performance and life of the bearing and the product.

[0044] The present invention is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as various improvements are made using the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A vortex pump impeller assembly and clearance control device, characterized in that: It includes an impeller head (13), a support seat (14), a spacer block (15), an adjusting block (16), and a long screw (19). At the center position of the lower end face of the impeller head (13), an inner platform I (20) is provided. At the outer ring position of the lower end face of the impeller head (13), an outer platform II (21) is provided. There is an impeller head height difference H1 between the inner platform I (20) and the outer platform II (21). In the lower part of the support seat (14), a support seat inner hole (17) is provided. A spacer block (15) is arranged in the support seat inner hole (17). An adjusting block (16) is arranged below the spacer block (15). The lower surface of the spacer block (15) is of a slope surface structure, and the upper surface of the adjusting block (16) is of a slope surface structure. The long screw (19) installed on the support seat (14) is screwed into the threaded hole of the adjusting block (16).

2. The vortex pump impeller assembly and clearance control device according to claim 1, characterized in that: On the support seat (14), a support seat transverse hole (18) parallel to the bottom end face (22) of the support seat is provided, and the support seat transverse hole (18) communicates with the support seat inner hole (17).

3. The vortex pump impeller assembly and clearance control device according to claim 2, characterized in that: The long screw (19) passes through the support seat transverse hole (18) and extends into the support seat inner hole (17). The long screw (19) is also movably connected to the support seat connection position (23) outside the support seat transverse hole (18). The long screw (19) is configured to be able to rotate relative to the support seat connection position (23) but not move laterally.

4. The vortex pump impeller assembly and clearance control device according to claim 1 or 2, characterized in that: The vortex pump includes a pump body (4), a cover plate (1), an impeller (3), and a motor (7). The motor (7) includes a motor rotor shaft (6). The cover plate (1) is connected to one end of the pump body (4), and the motor (7) is connected to the other end of the pump body (4). A medium chamber (2) is formed between the cover plate (1) and the pump body (4). The impeller (3) is installed on the motor rotor shaft (6) and is located in the medium chamber (2).

5. The vortex pump impeller assembly and clearance control device according to claim 4, characterized in that: Axial clearances A1 and A2 are formed between the impeller (3) and the pump body (4), and axial clearances B1 and B2 are formed between the impeller (3) and the cover plate (1).

6. The vortex pump impeller assembly and clearance control device according to claim 5, characterized in that: The pump body (4) includes a pump body height difference H2 and a pump body height difference H3, and the cover plate (1) includes a cover plate height difference H6 and a cover plate height difference H7.

7. The vortex pump impeller assembly and clearance control device according to claim 1 or 2, characterized in that: When the vortex pump impeller assembly and clearance control device assembles the impeller, the adjusting block (16) is located in the support seat inner hole (17), the spacer block (15) is supported on the adjusting block (16), and the lower end face of the motor rotor shaft (6) is located above the spacer block (15). When a force is applied to the impeller head (13), the inner platform I (20) of the impeller head (13) contacts the impeller (3) and the outer platform II (21) contacts the upper end face of the pump body (4) and then stops moving, completing the assembly of the impeller (3).

8. The vortex pump impeller assembly and clearance control device according to claim 7, characterized in that: When the vortex pump impeller assembly and clearance control device assembles the impeller, there is a clearance C between the inner bottom surface (24) of the support seat of the support seat (14) and the lower end face of the motor rotor shaft (6).

9. The vortex pump impeller assembly and clearance control device according to claim 5, characterized in that: The axial clearance A1 is composed of the impeller (3) and the pump body partition (9), and the axial clearance B1 is composed of the impeller (3) and the cover plate partition (10); the axial clearance A2 is composed of the impeller (3) and the pump body boss (11), and the axial clearance B2 is composed of the impeller (3) and the cover plate boss (12).

10. The vortex pump impeller assembly and clearance control method of the vortex pump impeller assembly and clearance control device according to any one of claims 1 to 9, characterized in that: The steps of the vortex pump impeller assembly and clearance control method are as follows: S1. The adjusting block (16) is located in the inner hole (17) of the support seat, the cushion block (15) is supported on the adjusting block (16), and the lower end surface of the motor rotor shaft (6) is located above the cushion block (15); S2. The axial clearance A1 is controlled by the impeller head height difference H1, the pump body height difference H2, and the impeller height difference H4; the axial clearance A2 is controlled by the impeller head height difference H1, the pump body height difference H3, and the impeller height difference H5; the axial clearance B1 is controlled by the cover plate height difference H6; the axial clearance B2 is controlled by the cover plate height difference H7; S3. Before pressing and installing the impeller (3) on the impeller head (13), rotate the long screw (19). The long screw (19) moves relative to the support seat (14) to push the adjusting block (16) to move. Under the cooperation of the inclined plane of the adjusting block (16) and the inclined plane of the cushion block (15), the cushion block (15) is pushed upward to abut against the lower end surface of the motor rotor shaft (6); S4. Apply force to the impeller head (13) until the inner platform Ⅰ (20) of the impeller head (13) contacts the impeller (3) and the outer platform Ⅱ (21) contacts the upper end surface of the pump body (4), completing the assembly of the impeller (3), and the clearance control is realized during the assembly process.

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