Adjustable centrifugal pump

Abstract

The invention discloses an adjustable centrifugal pump, and belongs to the technical field of centrifugal pumps, the adjustable centrifugal pump comprises a fixed base, a driving motor is fixedly mounted on one side of the top of the fixed base, and a main pump body is fixedly mounted on the other side of the top of the fixed base; a fixing assembly is rotationally connected into the main pump body, and an adjustable impeller is rotationally connected into the fixing assembly. One end of the fixing assembly is fixedly connected with a driving connecting assembly, and an impeller adjusting mechanism used for adjusting the structural state of the adjustable impeller is rotationally connected into the driving connecting assembly. The adjustable impeller is designed, so that the distance between the impeller disc and the fixed disc can be freely adjusted, the multiple main blades on one side of the fixed disc can slide on the impeller disc, the width of the multiple main blades in the working area on one side of the impeller disc is adjusted, and the fluid flow and lift are adjusted.

Description

Technical Field

[0001] The invention belongs to the technical field of centrifugal pumps, and in particular relates to an adjustable centrifugal pump. Background Art

[0002] A centrifugal pump is a common fluid conveying equipment, mainly used to transport liquid from one place to another, and is widely used in many fields such as industry, agriculture and municipal administration. Its working principle is based on the action of centrifugal force. Through the rotation of the impeller, the liquid obtains kinetic energy and converts it into pressure energy, finally realizing the liquid transportation. The core component of the centrifugal pump is the impeller. When the impeller rotates at high speed, the liquid is sucked into the center of the pump (i.e. the suction port). Under the action of the impeller, the liquid is thrown out along the outer edge of the impeller due to the centrifugal force. During the flow of the liquid, its kinetic energy is converted into pressure energy, and the pressure is further increased by the guide vanes or diffusers in the pump casing. The high-pressure liquid flows out from the outlet of the pump to complete the liquid transportation process.

[0003] An adjustable centrifugal pump is a type of centrifugal pump that can adjust the flow rate and head according to needs. Unlike a fixed flow centrifugal pump, it can achieve different operating conditions by changing the working parameters of the pump. There are many different types of adjustable centrifugal pumps on the market, but the existing adjustable centrifugal pumps are generally adjusted by adjusting the speed of the pump body. Although the flow rate and head adjustment purposes can be achieved, there are also defects. To adjust the speed of the pump body, a special variable frequency motor is required, which is not only costly, but also difficult to maintain in the later stage. Once a failure occurs, the repair cost is also higher; secondly, some centrifugal pumps will be adjusted by adding a regulating valve. This method also has major defects. Since additional equipment needs to be installed on the pump body, it is very difficult to install a regulating valve when the pump body installation space is limited. In addition, even by adding a regulating valve, usually only flow and pressure adjustment can be achieved, which makes its adjustment ability very limited and not suitable for a variety of different working conditions. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the disadvantages of the above-mentioned prior art and provide an adjustable centrifugal pump.

[0005] The technical solution adopted to solve the above technical problems is: an adjustable centrifugal pump, comprising a fixed base, a driving motor is fixedly installed on one side of the top of the fixed base, and a main pump body is fixedly installed on the other side of the top of the fixed base; A fixed component is rotatably connected to the main pump body, and an adjustable impeller is rotatably connected inside the fixed component; One end of the fixed component is fixedly connected to a driving connection component, and an impeller adjustment mechanism for adjusting the state of the adjustable impeller structure is rotatably connected inside the driving connection component.

[0006] Furthermore, the main pump body includes a main shell body fixed to the top of the fixed base, a water inlet is provided on one side of the main shell body, a drain outlet is provided at the rear end of the top of the main shell body, a water inlet is provided at the front end of the top of the main shell body, a sealing cover is threadedly connected to the water inlet, a main cover body is fixedly installed on the other side of the main shell body, a sealing end cover is fixedly installed at the outer center of the main cover body, and a positioning bearing is installed between the main cover body and the sealing end cover.

[0007] Through the above technical scheme, the main pump body serves as one of the main structures of the centrifugal pump. When the pump body is working, the water suction pipe is connected to the water inlet, and the water outlet pipe is connected to the drain outlet. The pump body will draw water into the main casing through the water inlet, and then the water flow will be pressurized and pumped out from the drain outlet under the drive of the impeller adjustment mechanism; in addition, a water inlet is provided at the front end of the top of the main casing. Before starting, the sealing cover can be opened for pre-watering to prevent the pump body from idling.

[0008] Furthermore, a first sealing ring is installed on the inner side wall of the sealing end cover, and two second sealing rings are installed on the inner wall of the main shell.

[0009] Through the above technical solution, the first sealing ring can realize the rotational seal between the sealing end cover and the fixed component, and the two second sealing rings can realize the rotational seal between the adjustable impeller and the main casing to prevent fluid leakage.

[0010] Furthermore, the fixing assembly includes a fixing plate, one side of the fixing plate is fixedly connected with an integrated fixing sleeve, and a third sealing ring is installed on the inner side wall of the fixing plate.

[0011] Through the above technical scheme, by setting up a fixing component, the fixing disk at one end can be fixed to the adjustable impeller by a fixing screw, and the other end can be fixed to the driving connection component by a screw. When the driving motor rotates through the driving connection component, the fixing component and the adjustable impeller can be driven to rotate synchronously, and then the high-speed rotation of the adjustable impeller can be used to realize the operation of the pump body; further, a locating bearing is installed between the main cover body and the sealing end cover, and the locating bearing can play a role of rotational support for the fixed sleeve, and the third sealing ring on the fixed disk can realize a rotational seal with the adjustable impeller.

[0012] Furthermore, a plurality of evenly distributed threaded holes are formed on the circumference of the other end of the fixed sleeve.

[0013] Through the above technical solution, the drive connection assembly can be quickly connected and fixed with the fixed sleeve by means of the fixing screw, thereby achieving rapid connection and fixing, and also facilitating subsequent inspection and maintenance.

[0014] Furthermore, the adjustable impeller includes a fixed disc fixed to one side of the fixed disc, a positioning hole is provided at the center of the fixed disc, a plurality of evenly distributed main blades are fixedly connected to the other side of the fixed disc, a plurality of evenly distributed side grooves are provided on the circumference of the fixed disc, an adjusting rod is slidably installed in the positioning hole, one end of the adjusting rod is fixedly connected to an impeller disc, one side of the impeller disc is fixedly connected to a side sealing plate, a plurality of evenly distributed blade slots are provided on the impeller disc and the side sealing plate, and an internal threaded hole is provided at the center of the other end of the adjusting rod.

[0015] Through the above technical scheme, the adjustable impeller can adjust the fluid flow and head by adjusting the blade width. During specific operation, the impeller adjustment mechanism can be used to drive the adjustment of the spacing between the impeller disk and the fixed disk, so that the multiple main blades on one side of the fixed disk can slide on the impeller disk, thereby changing the width adjustment of the multiple main blades on one side of the impeller disk. When the impeller disk moves toward the fixed disk, the working width of the multiple main blades will become larger, thereby increasing the flow and head of the pump body. Conversely, the flow and head of the pump body can be reduced. Furthermore, by fixing a side sealing plate on one side of the impeller disk, and the sliding limit of the side sealing plate is located in the corresponding side groove, on the one hand, precise cooperation between the two can be achieved to prevent fluid leakage. At the same time, the sliding adjustment of the impeller disk can achieve precise limiting to ensure the adjustment accuracy.

[0016] Furthermore, a fourth sealing ring is installed in the positioning hole.

[0017] Through the above technical solution, a rotary seal between the adjusting rod and the fixed disc can be achieved to prevent fluid leakage.

[0018] Furthermore, the drive connection assembly includes a fixing frame fixedly connected to one end of the fixed shaft sleeve, a through hole is opened in the center of one side of the fixing frame, a rotating seat is provided on the inner side of the other end of the fixing frame, and a connecting seat is fixedly connected to the outer side of the other end of the fixing frame.

[0019] Through the above technical solution, the drive connection assembly serves as a connecting bridge between the fixed assembly and the output shaft of the drive motor. When one end of the fixed frame is fixed to the fixed shaft sleeve and the connecting seat at the other end is fixed to the output shaft of the drive motor, the drive motor can drive the fixed assembly and the adjustable impeller to rotate synchronously through the drive connection assembly when working, so as to realize the normal operation of the pump body; in addition, since the middle part of the fixed frame adopts an open structure design, the operator can more conveniently operate the impeller adjustment mechanism to realize the blade width adjustment of the adjustable impeller.

[0020] Furthermore, one end of the adjustment rod passes through the through hole and extends into the fixing frame, the output shaft of the driving motor is inserted into the connecting seat, a mounting hole is opened on the outer side of the connecting seat, and the connecting seat is fixed to the output shaft of the driving motor by screws.

[0021] Through the above technical solution, since one end of the adjusting rod passes through and extends into the interior of the fixing frame, the end of the adjusting rod can be threadedly connected to the impeller adjusting mechanism, so that the blade width of the adjustable impeller can be adjusted subsequently through the impeller adjusting mechanism.

[0022] Furthermore, the impeller adjustment mechanism includes an adjustment screw rotatably connected to the rotating seat, the other end of the adjustment screw is threadedly connected to the internal threaded hole, and an adjustment handwheel is fixedly installed on one side of the outer wall of the adjustment screw close to the rotating seat.

[0023] Through the above technical solution, since one end of the adjusting screw is threadedly connected to the adjusting rod and the other end is rotatably connected to the rotating seat, the operator can drive the adjusting rod to move horizontally by screwing the thread when rotating the adjusting handwheel, so as to quickly adjust the width of multiple main blades in the working area on one side of the impeller disk, thereby realizing rapid adjustment of the pump flow and head. The impeller adjustment mechanism is not only simple in structure and easy to operate, but also can realize adjustment conveniently and quickly. Its simple structural design is also convenient for daily maintenance.

[0024] The beneficial effects of the present invention are as follows: (1) The present invention designs an adjustable impeller so that the spacing between the impeller disk and the fixed disk can be freely adjusted, so that the multiple main blades on one side of the fixed disk can slide on the impeller disk to change the width adjustment of the multiple main blades in the working area of ​​one side of the impeller disk, thereby realizing the adjustment of fluid flow and head; (2) The present invention designs a drive connection component, which can serve as a connecting bridge between the fixed component and the output shaft of the drive motor, so that the drive motor can drive the fixed component and the adjustable impeller to rotate synchronously through the drive connection component to realize the normal operation of the pump body; at the same time, by adopting an open structure design for the middle part of the fixed frame, the operator can more conveniently operate the impeller adjustment mechanism, thereby ensuring the convenience of operation; (3) The present invention designs a simple impeller adjustment mechanism. The operator only needs to rotate the adjustment hand wheel to drive the adjustment rod to move horizontally by screwing, so as to quickly adjust the width of the multiple main blades in the working area of ​​one side of the impeller disk. Not only is the structure simple and easy to operate, but it can also be adjusted quickly and conveniently. Its simple structural design is also convenient for daily maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a first perspective structural diagram of the present invention; Figure 2It is a second viewing angle structural diagram of the present invention; Figure 3 It is a front view of the present invention; Figure 4 It is a left side view of the present invention; Figure 5 yes Figure 4 Middle AA section view; Figure 6 This is a structural diagram of the main pump body of the present invention from a first perspective; Figure 7 This is a structural diagram of the main pump body of the present invention from a second viewing angle; Figure 8 It is a front view of the main pump body of the present invention; Fig. 9 is a cross-sectional view of the main pump body of the present invention; Fig.10 yes Fig. 9 A partial enlarged view of the middle A; Fig.11 This is a structural diagram of the adjustable impeller of the present invention from a first perspective; Fig.12 is a structural diagram of the adjustable impeller of the present invention from a second viewing angle; Fig.13 This is a first-view structural diagram of the explosion state of the adjustable impeller of the present invention; Fig.14 is a second perspective structural diagram of the explosion state of the adjustable impeller of the present invention; Fig.15 is a schematic structural diagram of a drive connection assembly of the present invention; Fig.16 It is a cross-sectional view of the drive connection assembly and the impeller adjustment mechanism of the present invention.

[0026] Figure numerals: 1, fixed base; 2, driving motor; 3, main pump body; 301, main housing; 302, water inlet; 303, drain outlet; 304, water inlet; 305, sealing cover; 306, main cover; 307, sealing end cover; 308, positioning bearing; 309, first sealing ring; 310, second sealing ring; 4, fixing assembly; 401, fixing plate; 402, fixing sleeve; 403, third sealing ring; 5, adjustable impeller; 501, Fixed disc; 502, positioning hole; 503, main blade; 504, side groove; 505, adjusting rod; 506, impeller disc; 507, side sealing plate; 508, blade slot; 509, internal threaded hole; 510, fourth sealing ring; 6, drive connection assembly; 601, fixed frame; 602, through hole; 603, rotating seat; 604, connecting seat; 605, mounting hole; 7, impeller adjustment mechanism; 701, adjusting screw; 702, adjusting handwheel. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0028] like Figure 1-Figure 16 As shown, an adjustable centrifugal pump of this embodiment includes a fixed base 1, a driving motor 2 is fixedly installed on one side of the top of the fixed base 1, and a main pump body 3 is fixedly installed on the other side of the top of the fixed base 1.

[0029] Regarding the main pump body 3, refer to Figure 1-Figure 10 The main pump body 3 includes a main shell 301 fixed on the top of the fixed base 1, a water inlet 302 is provided on one side of the main shell 301, a drain port 303 is provided at the rear end of the top of the main shell 301, a water filling port 304 is provided at the front end of the top of the main shell 301, a sealing cover 305 is threadedly connected to the water filling port 304, a main cover body 306 is fixedly installed on the other side of the main shell 301, a sealing end cover 307 is fixedly installed at the center of the outer side of the main cover body 306, and a positioning bearing 308 is installed between the main cover body 306 and the sealing end cover 307. The main pump body 3 is one of the main structures of the centrifugal pump. When the pump body is working, the water suction pipe is connected to the water inlet 302, and the water outlet pipe is connected to the drain port 303. The pump body will draw water into the main shell 301 through the water inlet 302, and then the water flow will be pressurized and pumped out from the drain port 303 under the drive of the impeller adjustment mechanism 7.

[0030] In this embodiment, a water inlet 304 is further provided at the front end of the top of the main housing 301. Before starting, the sealing cover 305 can be opened to pre-fill water to prevent the pump body from idling.

[0031] In this embodiment, a first sealing ring 309 is installed on the inner wall of the sealing end cover 307, and two second sealing rings 310 are installed on the inner wall of the main shell 301. The first sealing ring 309 can realize a rotating seal between the sealing end cover 307 and the fixed component 4, and the two second sealing rings 310 can realize a rotating seal between the adjustable impeller 5 and the main shell 301 to prevent fluid leakage.

[0032] For fixing component 4, refer to Figure 9-10A fixing component 4 is rotatably connected in the main pump body 3, and the fixing component 4 includes a fixing disk 401, and an integrated fixing sleeve 402 is fixedly connected to one side of the fixing disk 401. A third sealing ring 403 is installed on the inner wall of the fixing disk 401. By setting the fixing component 4, the fixing disk 401 at one end can be fixed to the adjustable impeller 5 by a fixing screw, and the other end can be fixed to the driving connection component 6 by a screw. When the driving motor 2 rotates through the driving connection component 6, the fixing component 4 and the adjustable impeller 5 can be driven to rotate synchronously, and then the high-speed rotation of the adjustable impeller 5 can be used to realize the operation of the pump body.

[0033] In this embodiment, a positioning bearing 308 is installed between the main cover body 306 and the sealing end cover 307. The positioning bearing 308 can provide rotational support for the fixed sleeve 402. The third sealing ring 403 on the fixed disk 401 can achieve rotational sealing with the adjustable impeller 5.

[0034] Furthermore, in this embodiment, a plurality of evenly distributed threaded holes are provided on the circumferential side of the other end of the fixed sleeve 402, so that the drive connection assembly 6 can be quickly connected and fixed to the fixed sleeve 402 by means of fixing screws, thereby achieving rapid connection and fixing, and also facilitating subsequent inspection and maintenance.

[0035] For adjustable impeller 5, refer to Figure 9-Figure 15, an adjustable impeller 5 is rotatably connected inside the fixed component 4; the adjustable impeller 5 includes a fixed disc 501 fixed to one side of the fixed disc 401, a positioning hole 502 is opened at the center of the fixed disc 501, a plurality of evenly distributed main blades 503 are fixedly connected to the other side of the fixed disc 501, a plurality of evenly distributed side grooves 504 are opened on the circumference of the fixed disc 501, an adjusting rod 505 is slidably installed in the positioning hole 502, an impeller disc 506 is fixedly connected to one end of the adjusting rod 505, a side sealing plate 507 is fixedly connected to one side of the impeller disc 506, a plurality of evenly distributed blade slots 508 are opened on the impeller disc 506 and the side sealing plate 507, so that the main blades 503 can be slidably limited in the corresponding blade slots 508, and at the same time, due to the precise matching between the two, the side sealing plate 507 can match the plurality of main The blades 503 form a complete circular structure, thereby ensuring the overall sealing. An internal threaded hole 509 is opened in the center of the other end of the adjusting rod 505. The adjustable impeller 5 can adjust the fluid flow and head by adjusting the blade width. During operation, the impeller adjusting mechanism 7 can be used to drive the spacing adjustment between the impeller disk 506 and the fixed disk 501, so that the multiple main blades 503 on one side of the fixed disk 501 can slide on the impeller disk 506, thereby changing the width adjustment of the multiple main blades 503 on one side of the impeller disk 506. When the impeller disk 506 moves toward the fixed disk 501, the working width of the multiple main blades 503 will become larger. A larger impeller can handle more fluid and generate greater pressure, thereby increasing the flow and head of the pump body. Conversely, the flow and head of the pump body can be reduced.

[0036] This embodiment further fixes a side sealing plate 507 on one side of the impeller disc 506, and the side sealing plate 507 is slidably limited in the corresponding side groove 504. On the one hand, precise matching between the two can be achieved to prevent fluid leakage. At the same time, the sliding adjustment of the impeller disc 506 can also be precisely limited to ensure the adjustment accuracy.

[0037] In this embodiment, a fourth sealing ring 510 is further installed in the positioning hole 502, so as to achieve a rotation seal between the adjusting rod 505 and the fixed disk 501 to prevent fluid leakage.

[0038] For drive connection assembly 6, refer to Figure 15-16One end of the fixed component 4 is fixedly connected to a driving connection component 6, and the driving connection component 6 includes a fixing frame 601 fixedly connected to one end of a fixed shaft sleeve 402, a through hole 602 is opened in the center of one side of the fixing frame 601, a rotating seat 603 is provided on the inner side of the other end of the fixing frame 601, and a connecting seat 604 is fixedly connected to the outer side of the other end of the fixing frame 601. The driving connection component 6 serves as a connecting bridge between the fixing component 4 and the output shaft of the driving motor 2. When one end of the fixing frame 601 is fixed to the fixed shaft sleeve 402 and the connecting seat 604 at the other end is fixed to the output shaft of the driving motor 2, the driving motor 2 can drive the fixing component 4 and the adjustable impeller 5 to rotate synchronously through the driving connection component 6 when working, so as to realize the normal operation of the pump body.

[0039] Furthermore, in this embodiment, since the middle part of the fixing frame 601 adopts an open structure design, the operator can more conveniently operate the impeller adjustment mechanism 7 to achieve blade width adjustment of the adjustable impeller 5 .

[0040] One end of the adjusting rod 505 passes through the through hole 602 and extends into the fixing frame 601, the output shaft of the driving motor 2 is inserted into the connecting seat 604, and a mounting hole 605 is provided on the outer side of the connecting seat 604. The connecting seat 604 is fixed to the output shaft of the driving motor 2 by screws. Since one end of the adjusting rod 505 passes through and extends into the fixing frame 601, the end of the adjusting rod 505 can be threadedly connected to the impeller adjusting mechanism 7, so that the blade width of the adjustable impeller 5 can be adjusted through the impeller adjusting mechanism 7 later.

[0041] Regarding the impeller adjustment mechanism 7, refer to Fig.16 , an impeller adjusting mechanism 7 for adjusting the structural state of the adjustable impeller 5 is rotatably connected in the driving connection assembly 6, and the impeller adjusting mechanism 7 includes an adjusting screw 701 rotatably connected in the rotating seat 603, and the other end of the adjusting screw 701 is threadedly connected in the internal threaded hole 509, and an adjusting handwheel 702 is fixedly installed on the outer wall of the adjusting screw 701 close to the rotating seat 603. Since one end of the adjusting screw 701 is threadedly connected to the adjusting rod 505, and the other end is rotatably connected to the rotating seat 603, when the operator rotates the adjusting handwheel 702, the adjusting rod 505 can be driven to move horizontally by threading, so that the width of multiple main blades 503 in the working area on one side of the impeller disk 506 can be quickly adjusted, thereby realizing rapid adjustment of the pump flow and head. The impeller adjusting mechanism 7 is not only simple in structure and easy to operate, but also can be easily and quickly adjusted. Its simple structural design is also convenient for daily maintenance.

[0042] The working principle of this embodiment is as follows. When using the centrifugal pump, the water pumping pipe is connected to the water inlet 302, the water outlet pipe is connected to the drain outlet 303, and then the drive motor 2 is started. The drive connection component 6 serves as a connecting bridge between the fixed component 4 and the output shaft of the drive motor 2. When the drive motor 2 is working, it can drive the fixed component 4 and the adjustable impeller 5 to rotate synchronously through the drive connection component 6 to achieve normal operation of the pump body; When the adjustable impeller 5 rotates at a high speed, it will generate a large centrifugal force. At this time, the liquid will be sucked into the main housing 301 by the adjustable impeller 5. After the liquid enters, due to the action of centrifugal force, its kinetic energy is converted into pressure energy, and is further pressurized by the adjustable impeller 5 in the main housing 301, so that the liquid will be thrown out along the outer edge of the impeller. At this time, the high-pressure liquid will be discharged from the drain port 303 of the pump and enter the water outlet pipe, thereby completing the work of pumping the liquid; An impeller adjustment mechanism 7 for adjusting the structural state of the adjustable impeller 5 is rotatably connected in the driving connection assembly 6. When the operator rotates the adjustment hand wheel 702, the adjustment rod 505 can be driven to move horizontally by screwing together, so as to quickly adjust the width of multiple main blades 503 in the working area on one side of the impeller disk 506, thereby realizing rapid adjustment of the pump flow and lift. In actual work, the operator can quickly adjust the adjustable impeller 5 according to actual needs to adapt to different working conditions.

[0043] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention.

Claims

1. An adjustable centrifugal pump, comprising a fixed base (1), a driving motor (2) being fixedly mounted on one side of the top of the fixed base (1), characterized in that: A main pump body (3) is fixedly mounted on the other side of the top of the fixed base (1); A fixed component (4) is rotatably connected inside the main pump body (3), and an adjustable impeller (5) is rotatably connected inside the fixed component (4); One end of the fixed component (4) is fixedly connected to a driving connection component (6), and an impeller adjustment mechanism (7) for adjusting the structural state of the adjustable impeller (5) is rotatably connected inside the driving connection component (6).

2. The adjustable centrifugal pump according to claim 1, characterized in that: The main pump body (3) comprises a main shell (301) fixed to the top of the fixed base (1); a water inlet (302) is provided on one side of the main shell (301); a water outlet (303) is provided at the rear end of the top of the main shell (301); a water inlet (304) is provided at the front end of the top of the main shell (301); a sealing cover (305) is threadedly connected to the water inlet (304); a main cover body (306) is fixedly installed on the other side of the main shell (301); a sealing end cover (307) is fixedly installed at the center of the outer side of the main cover body (306); and a positioning bearing (308) is installed between the main cover body (306) and the sealing end cover (307).

3. The adjustable centrifugal pump according to claim 2, characterized in that: A first sealing ring (309) is installed on the inner side wall of the sealing end cover (307), and two second sealing rings (310) are installed on the inner wall of the main housing (301).

4. The adjustable centrifugal pump according to claim 1, characterized in that: The fixing assembly (4) comprises a fixing disk (401), one side of the fixing disk (401) is fixedly connected to an integral fixing sleeve (402), and a third sealing ring (403) is installed on the inner side wall of the fixing disk (401).

5. The adjustable centrifugal pump according to claim 4, characterized in that: A plurality of evenly distributed threaded holes are provided on the circumferential side of the other end of the fixed shaft sleeve (402).

6. The adjustable centrifugal pump according to claim 4, characterized in that: The adjustable impeller (5) comprises a fixed disc (501) fixed to one side of a fixed disc (401); a positioning hole (502) is provided at the center of the fixed disc (501); a plurality of evenly distributed main blades (503) are fixedly connected to the other side of the fixed disc (501); a plurality of evenly distributed side grooves (504) are provided on the circumference of the fixed disc (501); an adjusting rod (505) is slidably mounted in the positioning hole (502); an impeller disc (506) is fixedly connected to one end of the adjusting rod (505); a side sealing plate (507) is fixedly connected to one side of the impeller disc (506); a plurality of evenly distributed blade slots (508) are provided on the impeller disc (506) and the side sealing plate (507); and an internal threaded hole (509) is provided at the center of the other end of the adjusting rod (505).

7. The adjustable centrifugal pump according to claim 6, characterized in that: A fourth sealing ring (510) is installed in the positioning hole (502).

8. The adjustable centrifugal pump according to claim 6, characterized in that: The driving connection assembly (6) comprises a fixing frame (601) fixedly connected to one end of a fixing shaft sleeve (402), a through hole (602) is provided at the center of one side of the fixing frame (601), a rotating seat (603) is provided on the inner side of the other end of the fixing frame (601), and a connecting seat (604) is fixedly connected to the outer side of the other end of the fixing frame (601).

9. The adjustable centrifugal pump according to claim 8, characterized in that: One end of the adjusting rod (505) passes through the through hole (602) and extends into the fixing frame (601); the output shaft of the driving motor (2) is plugged into the connecting seat (604); a mounting hole (605) is provided on the outside of the connecting seat (604); and the connecting seat (604) is fixed to the output shaft of the driving motor (2) by means of screws.

10. The adjustable centrifugal pump according to claim 9, characterized in that: The impeller adjustment mechanism (7) comprises an adjustment screw (701) rotatably connected to the rotating seat (603); the other end of the adjustment screw (701) is threadedly connected to the internal threaded hole (509); and an adjustment hand wheel (702) is fixedly mounted on one side of the outer wall of the adjustment screw (701) close to the rotating seat (603).

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