Multi-stage frequency conversion make-up pump

Abstract

The invention discloses a multi-stage frequency conversion make-up pump, and relates to the technical field of make-up pumps. The device comprises a base, a motor and a water outlet part are fixedly installed at the top of the base, two supporting rods are fixedly installed on the left side of the water outlet part, a water inlet part is fixedly installed on the supporting rods, and a plurality of modular assemblies are arranged between the water inlet part and the water outlet part. Through the arrangement of modular assemblies, the series of the make-up pump can be combined at will, the series of the make-up pump can be adjusted according to the field environment, and the application range is wide. Through the arrangement of the built-in temporary turbofan inclined part and the indication insertion rod, when the impeller at the corresponding position is damaged, the flow in the modular assembly is reduced, and the indication insertion rod moves towards the interior of the shell, so that the position of the damaged impeller can be accurately judged through the indication insertion rod; disassembling and overhauling of the damaged impeller can be rapidly achieved, and the overhauling efficiency is high.

Description

Technical Field

[0001] The present invention relates to the technical field of make-up water pumps, and particularly to a multi-stage variable-frequency make-up water pump. Background Art

[0002] The heating system is an important and indispensable part of modern buildings. Especially in cold regions, winter heating is particularly important. The heating system usually heats water through a boiler and transports the hot water to each room or area of the building through a pump. However, in traditional heating systems, the pump usually runs at a constant speed, which may lead to energy waste and low system operation efficiency. With the increasing demands for energy conservation and environmental protection, the technology of heating variable-frequency make-up water pumps has emerged.

[0003] In the utility model patent with the publication number of CN207195205U, a double-shell radially split multi-stage centrifugal boiler emergency make-up water pump is disclosed, which is characterized in that the double-shell radially split multi-stage centrifugal boiler emergency make-up water pump includes: an inner core component, a cylinder component, a pump cover, a balance mechanism, a sealing box body, a sealing component and a bearing component.

[0004] The following technical problems exist in the actual use of this patent and the prior art: 1. The existing multi-stage make-up water pumps are composed of multiple series-connected impellers, and the multiple impellers are installed on the same output shaft. The housing of the make-up water pump is also in a fixed manner, which results in a fixed number of stages of the make-up water pump and makes it impossible to adjust the number of stages of the make-up water pump later. This means that in some cases, the number of stages of the pump may be too many or too few, resulting in the system being unable to optimally match the actual working conditions. For example, at low flow requirements, too many stages will lead to high energy consumption; while at high flow requirements, insufficient stages may result in insufficient water flow or pressure not meeting the requirements.

[0005] 2. Since multiple impellers are provided in the multi-stage make-up water pump, if one of the impellers is damaged, although it is possible to judge the damaged impeller based on the flow rate and vibration of the pump, it is impossible to accurately find the damaged impeller, and the entire make-up water pump needs to be disassembled for inspection, resulting in low maintenance efficiency. Summary of the Invention

[0006] The purpose of the present invention is: to solve the above problems, the present invention provides a multi-stage variable-frequency make-up water pump.

[0007] The present invention specifically adopts the following technical solutions to achieve the above purpose: A multi-stage variable-frequency make-up water pump includes a base. A motor and a water outlet part are fixedly installed on the top of the base. Two groups of support rods are fixedly installed on the left side of the water outlet part. An inlet part is fixedly installed on the support rods. A plurality of modular components are arranged between the inlet part and the water outlet part; The modular component includes an outer shell, which can be fixedly mounted on a support rod, an impeller is fixedly mounted inside the outer shell, a segmented sleeve is inserted inside the impeller, an impeller is mounted outside the segmented sleeve, two spline shaft holes are penetrated inside the segmented sleeve, a segmented shaft core is slidably connected inside the second spline shaft hole, a spline shaft head is provided at one end of the segmented shaft core away from the second spline shaft hole, a top spring is provided between the segmented shaft core and the inner wall of the second spline shaft hole, a conical driving part is provided on the outside of the segmented shaft core, two groups of jacks are opened on the outside of the segmented sleeve, and two groups of indicator plug rods are seal-insulated on the outside of the outer shell.

[0008] Furthermore, an impeller sleeve is provided at one end of the impeller close to the guide impeller, the impeller sleeve is sleeved on the outside of the segmented shaft sleeve, and the guide impeller is sleeved on the outside of the impeller sleeve, a positioning external thread is provided on the outside of the impeller sleeve, and a positioning ring is connected to the outer thread of the positioning external thread, and the guide impeller is located between the impeller and the positioning ring.

[0009] Furthermore, a pressurized chamber and a through hole are provided inside the outer shell, the guide vane and the impeller are both located in the pressurized chamber, a temporary turbofan is inserted into the through hole, the temporary turbofan is sleeved on the outer side of the impeller sleeve, a connecting swivel is rotatably installed on the side of the temporary turbofan close to the guide vane, an internal tension spring is fixedly connected between the connecting swivel and the positioning ring, an inclined portion is provided on the outer side of the temporary turbofan, an indicating rod can be pressed against the inclined portion, and an external tension spring is provided between the indicating rod and the outer shell.

[0010] Furthermore, it also includes a detection bracket, which is located on the front side of the modular component. Multiple groups of laser distance sensors are fixedly installed on one side of the detection bracket close to the modular component. The laser distance sensors are arranged corresponding to the indicator rods. A warning light is fixedly installed on the other side of the detection bracket. The laser distance sensor can control the power on and off of the warning light through a controller.

[0011] Furthermore, a transmission keyway is provided on the outer side of the impeller sleeve, a transmission sliding key is provided on the inner wall of the temporary turbofan, a limiting hole is provided on the outer side of the indicating rod, and a limiting bolt is threadedly connected to the outer side of the outer shell. When the limiting bolt is threadedly connected in the limiting hole, the indicating rod exceeds the temporary turbofan inwardly, and the transmission sliding key slides into the transmission keyway.

[0012] Furthermore, a guide hole is provided on the inner wall of the segmented sleeve, a clamping column is slidably connected inside the guide hole, a clamping spring is arranged between the clamping column and the inner wall of the guide hole, a clamping hole is provided on the outer side of the segmented shaft core, the clamping column can be inserted into the clamping hole, a friction slider is slidably connected to the inner wall of the insertion hole, and the friction slider is connected to the clamping column through a transmission rope.

[0013] Furthermore, a spline shaft hole one is provided inside the impeller, and a spline shaft head one is arranged on the outer side of the segmented shaft sleeve. The spline shaft head one can be inserted into the spline shaft hole one.

[0014] Furthermore, two groups of connecting claws are arranged on the outer sides of the housing and the water inlet part. A semi-circular connecting piece is fixedly installed at the bottom of the connecting claw. The semi-circular connecting piece and the connecting claw form a collar, and the collar is sleeved on the support rod. A locking thread is provided on the outer side of the support rod, and the locking thread is arranged corresponding to the modular component. A locking nut is threadedly connected to the outer side of the locking thread.

[0015] Furthermore, a sliding rod is slidably connected to the left side of the base, and a support sleeve is arranged on the left side of the sliding rod. The support sleeve can be sleeved on the support rod.

[0016] Furthermore, a connecting shaft is rotatably installed inside the water outlet part. The connecting shaft is connected to the output end of the motor through a coupling. A spline shaft hole one is also provided at the end of the connecting shaft far from the motor.

[0017] The beneficial effects of the present invention are as follows: 1. By adopting the setting of the modular component, the present invention can realize any combination of the number of make-up water pumps, and can adjust the number of make-up water pumps according to the on-site environment, with a wide range of applications.

[0018] 2. Through the setting of the built-in temporary vortex fan inclined part and the indicating insertion rod, when the impeller at the corresponding position is damaged, the flow rate in the modular component decreases, and the indicating insertion rod will move towards the inside of the housing. Therefore, the position of the damaged impeller can be accurately judged through the indicating insertion rod. Through the setting of the modular component and the support rod, the disassembly and maintenance of the damaged impeller can be quickly realized, and the maintenance efficiency is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic diagram of the overall structure of the present invention Figure 1 ; Figure 2 is a schematic diagram of the overall structure of the present invention Figure 2 ; Figure 3 is a schematic diagram of the disassembly of the modular component of the present invention; Figure 4 is the explosion of the modular component of the present invention Figure 1 ; Figure 5 is the explosion of the modular component of the present invention Figure 2 ; Figure 6 is a schematic diagram of the structure of the segmented shaft sleeve and the segmented shaft core of the present invention; Figure 7 is a schematic diagram of the structure of the segmented shaft sleeve of the present invention; Figure 8is a schematic diagram of the temporary turbofan structure of the present invention; Figure 9 is a schematic cross-sectional structure diagram of the modular component of the present invention; Figure 10 is the present invention Figure 9 is an enlarged schematic diagram of part A in

[0020] Reference numerals: 1, base; 11, slide bar; 12, support sleeve; 2, motor; 3, water outlet part; 31, support rod; 32, locking thread; 33, locking nut; 4, water inlet part; 5, housing; 51, connecting claw; 52, semi-circular connecting piece; 53, guide impeller; 54, impeller; 541, impeller sleeve; 542, spline shaft hole one; 543, positioning external thread; 544, transmission keyway; 55, segmented shaft sleeve; 551, spline shaft hole two; 552, spline shaft head one; 553, jack; 554, clamping column; 555, friction slider; 56, segmented shaft core; 561, spline shaft head two; 562, conical driving part; 563, clamping hole; 57, indicating plug rod; 571, external tension spring; 572, limiting hole; 573, limiting bolt; 58, temporary turbofan; 581, inclined part; 582, transmission sliding key; 583, connecting rotating ring; 584, internal tension spring; 585, positioning ring; 59, top spring; 6, detection bracket; 61, laser distance sensor; 62, warning lamp. Detailed implementation manners

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0022] In Embodiment 1, as Figures 1 - 10 shown, a multi-stage variable-frequency makeup water pump includes a base 1. A motor 2 and a water outlet part 3 are fixedly installed on the top of the base 1. Two groups of support rods 31 are fixedly installed on the left side of the water outlet part 3. A water inlet part 4 is fixedly installed on the support rods 31. A plurality of modular components are arranged between the water inlet part 4 and the water outlet part 3; The modular component includes a housing 5. The housing 5 can be fixedly installed on the support rod 31. A guide impeller 53 is fixedly installed inside the housing 5. A segmented shaft sleeve 55 is inserted inside the guide impeller 53. An impeller 54 is installed outside the segmented shaft sleeve 55. A spline shaft hole two 551 is formed through the inside of the segmented shaft sleeve 55. A segmented shaft core 56 is slidably connected inside the spline shaft hole two 551. A spline shaft head two 561 is arranged at one end of the segmented shaft core 56 away from the spline shaft hole two 551. A top spring 59 is arranged between the segmented shaft core 56 and the inner wall of the spline shaft hole two 551. A conical driving part 562 is arranged on the outside of the segmented shaft core 56. Two groups of jacks 553 are formed on the outside of the segmented shaft sleeve 55. Two groups of indicating plug rods 57 are hermetically inserted on the outside of the housing 5.

[0023] Furthermore, a spline shaft hole 542 is provided inside the impeller 54, and a first spline shaft head 552 is provided on the outer side of the segmented shaft sleeve 55. The first spline shaft head 552 can be inserted into the spline shaft hole 542.

[0024] Furthermore, a connecting shaft is rotatably installed inside the water outlet part 3. The connecting shaft is connected to the output end of the motor 2 through a coupling. A spline shaft hole 542 is also provided at the end of the connecting shaft away from the motor 2.

[0025] During assembly, first install the modular components on the left side of the water outlet part 3, then install multiple modular components in sequence, and finally install the water inlet part 4. The specific installation steps are as follows: Fix the guide impeller 53 in the housing 5, then pass the segmented shaft sleeve 55 through the guide impeller 53, then insert two groups of indicating plug rods 57 into the housing 5, and make the two groups of indicating plug rods 57 inserted into the two groups of jacks 553. The two groups of indicating plug rods 57 position and clamp the segmented shaft sleeve 55. As the indicating plug rods 57 continue to be inserted, the indicating plug rods 57 push the segmented shaft core 56 to slide into the segmented shaft sleeve 55 through the conical driving part 562, and the second spline shaft head 561 is received into the segmented shaft sleeve 55. Then install the impeller 54 on the segmented shaft sleeve 55 through the spline shaft hole 542 and the first spline shaft head 552. Subsequently, install the housing 5 on the support rod 31 in sequence. The adjacent housings 5 are closely attached to achieve sealing, and the two ends of the adjacent segmented shaft sleeves 55 are attached to each other. After installation, pull the indicating plug rod 57 outwards. The indicating plug rod 57 first moves away from the conical driving part 562, and the top spring 59 pushes the segmented shaft core 56 to slide. The segmented shaft core 56 drives the second spline shaft head 561 to be inserted into the spline shaft hole 551 in the adjacent right segmented shaft sleeve 55. The second spline shaft head 561 straddles between two adjacent segmented shaft sleeves 55, realizing the transmission connection between the adjacent segmented shaft sleeves 55. It should be noted that the rightmost second spline shaft head 561 straddles between the segmented shaft sleeve 55 and the connecting shaft. Therefore, the transmission connection of the segmented shaft sleeve 55 is completed, and the indicating plug rod 57 is disengaged from the jack 553 and received in the housing 5, which will not affect the normal operation of the makeup water pump. Finally, install the water inlet part 4 on the left side of the leftmost modular component to complete the installation of the multi-stage makeup water pump.

[0026] During disassembly, insert the indicating plug rod 57 into the housing 5. At the same time, use a tool to drive the connecting shaft to rotate. The connecting shaft drives the segmented shaft sleeve 55 to rotate synchronously. When the jack 553 rotates to a position corresponding to the indicating plug rod 57, insert the two indicating plug rods 57 into the two jacks 553 respectively. The indicating plug rod 57 clamps the segmented shaft sleeve 55. As the indicating plug rod 57 is continuously inserted, it pushes the segmented shaft core 56 to slide into the segmented shaft sleeve 55 through the conical driving part 562, and the spline shaft head two 561 is received into the segmented shaft sleeve 55. The spline shaft head two 561 in this modular component is far from the segmented shaft sleeve 55 on the right side. At the same time, it is necessary to control the spline shaft head two 561 in the left modular component to be far from this segmented shaft sleeve 55. Therefore, this modular component can be directly disassembled from the water pump, and disassembly and maintenance can be selectively carried out without overall disassembly, and the maintenance efficiency is high.

[0027] Therefore, the present invention adopts a modular design, which can realize any combination of the number of makeup water pumps, can adjust the number of makeup water pumps according to the on-site environment, has a wide range of applications, and can be repaired and replaced specifically, with high maintenance efficiency.

[0028] Embodiment 2, on the basis of the above embodiment, further includes that a impeller sleeve 541 is arranged at one end of the impeller 54 close to the guide impeller 53. The impeller sleeve 541 is sleeved on the outside of the segmented shaft sleeve 55, and the guide impeller 53 is sleeved on the outside of the impeller sleeve 541. A positioning external thread 543 is provided on the outside of the impeller sleeve 541, and a positioning ring 585 is threadedly connected to the outside of the positioning external thread 543. The guide impeller 53 is located between the impeller 54 and the positioning ring 585.

[0029] Through this design, the axial position of the impeller 54 can be limited, and the operation is more stable.

[0030] Embodiment 3, on the basis of the above embodiment, further includes that a pressurizing chamber and a through hole are provided inside the housing 5. Both the guide impeller 53 and the impeller 54 are located in the pressurizing chamber. A temporary vortex fan 58 is inserted into the through hole. The temporary vortex fan 58 is sleeved on the outside of the impeller sleeve 541. A connecting rotating ring 583 is rotatably installed on one side of the temporary vortex fan 58 close to the guide impeller 53. An internal tension spring 584 is fixedly connected between the connecting rotating ring 583 and the positioning ring 585. An inclined part 581 is provided on the outside of the temporary vortex fan 58. The indicating plug rod 57 can press against the inclined part 581, and an external tension spring 571 is provided between the indicating plug rod 57 and the housing 5.

[0031] Since there are a large number of impellers 54 in the makeup water pump, when one group of impellers 54 is damaged, it is impossible to quickly find the position of the corresponding impeller 54. Therefore, through the setting of the temporary vortex fan 58, during normal use, the flow rate and pressure passing through the through-hole meet the requirements. Therefore, the water flow will push the temporary vortex fan 58 to slide into the through-hole. The temporary vortex fan 58 pushes the indicating plug rod 57 to slide outward from the housing 5 through the inclined portion 581. After the impeller 54 in this modular component is damaged, the internal flow rate of the modular component located on the left side of this modular component meets the requirements, and the internal flow rate and pressure of this modular component and the modular components on its right side will both decrease. Therefore, the inner tension spring 584 will pull the temporary vortex fan 58 closer to the impeller 54, and the indicating plug rod 57 will move inward into the housing 5 under the action of the outer tension spring 571. Therefore, by observing the exposed length of the indicating plug rod 57, the position of the damaged impeller 54 can be judged. It should be noted that by only observing whether the exposed length of the right indicating plug rod 57 is shorter, the damage condition of the right impeller 54 can also be continuously judged. The main logic is that the flow rate on the right side of the damaged impeller 54 will decrease synchronously, but there will be a height difference with the adjacent left side. Therefore, by judging the stepped position of the indicating plug rod 57, the damage condition of multiple impellers 54 can be judged.

[0032] Embodiment 4, on the basis of the above embodiment, further includes a detection bracket 6. The detection bracket 6 is located on the front of the modular component. A plurality of laser distance sensors 61 are fixedly installed on the side of the detection bracket 6 close to the modular component. The laser distance sensors 61 are arranged corresponding to the indicating plug rod 57. A warning lamp 62 is fixedly installed on the other side of the detection bracket 6. The laser distance sensors 61 can control the power on and off of the warning lamp 62 through a controller.

[0033] The laser distance sensor 61 detects the exposed length of the indicating plug rod 57. When the exposed length is too short, the laser distance sensor 61 can control the warning lamp 62 to be powered on and lit through the controller, so that the damage condition of the impeller 54 can be discovered more timely.

[0034] Embodiment 5, on the basis of the above embodiment, further includes that a transmission key groove 544 is opened on the outer side of the impeller sleeve 541, a transmission sliding key 582 is arranged on the inner wall of the temporary vortex fan 58, a limiting hole 572 is opened on the outer side of the indicating plug rod 57, and a limiting bolt 573 is threadedly connected to the outer side of the housing 5. When the limiting bolt 573 is threadedly connected to the limiting hole 572, the indicating plug rod 57 extends inward beyond the temporary vortex fan 58, and at the same time, the transmission sliding key 582 slides into the transmission key groove 544.

[0035] When the impeller 54 is damaged but temporary water replenishment is still required, the indicating plug rod 57 is pushed into the housing 5 at this time. The indicating plug rod 57 pushes the temporary vortex fan 58 to move towards the impeller 54 through the inclined portion 581. When the limiting hole 572 moves to the position of the limiting bolt 573, the limiting bolt 573 is threadedly connected to the limiting hole 572. At this time, the indicating plug rod 57 extends inward beyond the temporary vortex fan 58, and at the same time, the transmission sliding key 582 slides into the transmission key groove 544. At this time, the temporary vortex fan 58 can rotate synchronously with the impeller 54. The temporary vortex fan 58 is used to increase the flow rate of the water replenishing pump, enabling the water replenishing pump to operate emergently for a period of time and adapt to more complex environments.

[0036] Embodiment Six, on the basis of the above embodiment, further includes that a guide hole is opened on the inner wall of the segmented shaft sleeve 55, a clamping column 554 is slidably connected inside the guide hole, a clamping spring is arranged between the clamping column 554 and the inner wall of the guide hole, a clamping hole 563 is opened on the outer side of the segmented shaft core 56, and the clamping column 554 can be inserted into the clamping hole 563. A friction slider 555 is slidably connected to the inner wall of the jacking hole 553, and the friction slider 555 is in transmission connection with the clamping column 554 through a transmission rope.

[0037] Since the segmented shaft core 56 is connected by the elastic force of the top spring 59 and is prone to instability during operation, through the setting of this embodiment, when the spline shaft head two 561 on the segmented shaft core 56 is engaged in connection, the clamping column 554 is inserted into the clamping hole 563 under the action of the clamping spring, and the clamping column 554 is distributed radially along the segmented shaft core 56. Therefore, an axial limiting force for the segmented shaft core 56 can be stably provided.

[0038] During disassembly, the indicating plug rod 57 is inserted into the housing 5. At the same time, a tool is used to drive the connecting shaft to rotate, and the connecting shaft drives the segmented shaft sleeve 55 to rotate synchronously. When the jacking hole 553 rotates to correspond to the position of the indicating plug rod 57, the two indicating plug rods 57 are respectively inserted into the two jacking holes 553. The indicating plug rod 57 drives the friction slider 555 to slide into the segmented shaft sleeve 55 through friction. The friction slider 555 drives the clamping column 554 away from the clamping hole 563 through the transmission rope. As the indicating plug rod is continuously inserted, the segmented shaft core 56 is pushed into the segmented shaft sleeve 55 through the conical driving portion 562, and the spline shaft head two 561 is received into the segmented shaft sleeve 55. The spline shaft head two 561 in this modular component is away from the segmented shaft sleeve 55 on the right side. At the same time, it is necessary to control the spline shaft head two 561 in the modular component on the left side to be away from this segmented shaft sleeve 55. Therefore, this modular component can be directly disassembled from the water pump.

[0039] Embodiment VII. On the basis of the above embodiments, it further includes that two sets of connecting claws 51 are arranged on the outer sides of the housing 5 and the water inlet part 4. A semi-circular connecting part 52 is fixedly installed at the bottom of the connecting claw 51. The semi-circular connecting part 52 and the connecting claw 51 form a collar, and the collar is sleeved on the support rod 31. A locking thread 32 is provided on the outer side of the support rod 31. The locking thread 32 is arranged corresponding to the modular component. A locking nut 33 is threadedly connected to the outer side of the locking thread 32.

[0040] By pressing the connecting claw 51 on the support rod 31 and then installing the semi-circular connecting part 52 on the connecting claw 51 by using bolts, at this time, the housing 5 is sleeved on the support rod 31 through the connecting claw 51 and the semi-circular connecting part 52. The housing 5 can slide along the support rod 31. After the rightmost housing 5 presses on the water outlet part 3, a pressing force is applied through the locking nut 33 to ensure the installation tightness.

[0041] Embodiment VIII. On the basis of the above embodiments, it further includes that a sliding rod 11 is slidably connected to the left side of the base 1. A support sleeve 12 is arranged on the left side of the sliding rod 11, and the support sleeve 12 can be sleeved on the support rod 31.

[0042] When disassembling the whole, pull the sliding rod 11 to slide. The sliding rod 11 drives the support sleeve 12 to move away from the support rod 31, thereby not affecting the disassembly of the locking nut 33 on the support rod 31. When installing, the support sleeve 12 is sleeved on the support rod 31 to provide a supporting force for the left end of the support rod 31.

[0043] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A multi-stage variable frequency water supply pump, comprising a base (1), characterized in that: A motor (2) and a water outlet (3) are fixedly mounted on the top of the base (1); two groups of support rods (31) are fixedly mounted on the left side of the water outlet (3); a water inlet (4) is fixedly mounted on the support rods (31); and a plurality of groups of modular components are arranged between the water inlet (4) and the water outlet (3); The modular component comprises a housing (5), the housing (5) being fixedly mounted on a support rod (31), a guide impeller (53) being fixedly mounted inside the housing (5), a segmented shaft sleeve (55) being inserted inside the guide impeller (53), an impeller (54) being mounted outside the segmented shaft sleeve (55), a second spline shaft hole (551) being penetrated inside the segmented shaft sleeve (55), a segmented shaft core (54) being slidably connected inside the second spline shaft hole (551) 56), a second spline shaft head (561) is arranged at one end of the segmented shaft core (56) away from the second spline shaft hole (551), a top spring (59) is arranged between the segmented shaft core (56) and the inner wall of the second spline shaft hole (551), a conical driving portion (562) is arranged on the outer side of the segmented shaft core (56), two groups of jacks (553) are opened on the outer side of the segmented shaft sleeve (55), and two groups of indicating plug rods (57) are sealed and plugged on the outer side of the housing (5).

2. A multi-stage variable frequency water supply pump according to claim 1, characterized in that: An impeller sleeve (541) is provided at one end of the impeller (54) close to the guide impeller (53); the impeller sleeve (541) is sleeved on the outside of the segmented shaft sleeve (55), and the guide impeller (53) is sleeved on the outside of the impeller sleeve (541); a positioning external thread (543) is provided on the outside of the impeller sleeve (541); a positioning ring (585) is threadedly connected to the outside of the positioning external thread (543); and the guide impeller (53) is located between the impeller (54) and the positioning ring (585).

3. A multi-stage variable frequency water supply pump according to claim 2, characterized in that: A pressurizing chamber and a through hole are provided inside the housing (5), the guide vane (53) and the impeller (54) are both located in the pressurizing chamber, a temporary turbofan (58) is inserted into the through hole, the temporary turbofan (58) is sleeved on the outside of the impeller sleeve (541), a connecting ring (583) is rotatably installed on the side of the temporary turbofan (58) close to the guide vane (53), an internal tension spring (584) is fixedly connected between the connecting ring (583) and the positioning ring (585), an inclined portion (581) is provided on the outside of the temporary turbofan (58), an indicating rod (57) can be pressed against the inclined portion (581), and an external tension spring (571) is provided between the indicating rod (57) and the housing (5).

4. A multi-stage variable frequency water supply pump according to claim 3, characterized in that: It also includes a detection bracket (6), the detection bracket (6) is located on the front side of the modular component, a plurality of groups of laser distance sensors (61) are fixedly installed on one side of the detection bracket (6) close to the modular component, the laser distance sensors (61) are arranged correspondingly to the indicator rods (57), and a warning light (62) is fixedly installed on the other side of the detection bracket (6), and the laser distance sensor (61) can control the power on and off of the warning light (62) through a controller.

5. A multi-stage variable frequency water supply pump according to claim 4, characterized in that: The outer side of the impeller sleeve (541) is provided with a transmission keyway (544), the inner wall of the temporary turbofan (58) is provided with a transmission sliding key (582), the outer side of the indicating rod (57) is provided with a limiting hole (572), and the outer side of the housing (5) is threadedly connected with a limiting bolt (573). When the limiting bolt (573) is threadedly connected in the limiting hole (572), the indicating rod (57) moves inwardly beyond the temporary turbofan (58), and the transmission sliding key (582) slides into the transmission keyway (544).

6. A multi-stage variable frequency water supply pump according to claim 5, characterized in that: A guide hole is provided on the inner wall of the segmented shaft sleeve (55), a clamping column (554) is slidably connected to the inside of the guide hole, a clamping spring is provided between the clamping column (554) and the inner wall of the guide hole, a clamping hole (563) is provided on the outer side of the segmented shaft core (56), the clamping column (554) can be inserted into the clamping hole (563), a friction slider (555) is slidably connected to the inner wall of the insertion hole (553), and the friction slider (555) is transmission-connected to the clamping column (554) via a transmission rope.

7. A multi-stage variable frequency water supply pump according to claim 6, characterized in that: A spline shaft hole (542) is provided inside the impeller (54), and a spline shaft head (552) is provided on the outside of the segmented shaft sleeve (55). The spline shaft head (552) can be inserted into the spline shaft hole (542).

8. A multi-stage variable frequency water supply pump according to claim 7, characterized in that: Two groups of connecting claws (51) are arranged on the outer sides of the housing (5) and the water inlet (4); a semicircular connecting piece (52) is fixedly mounted on the bottom of the connecting claw (51); the semicircular connecting piece (52) and the connecting claw (51) form a collar, which is sleeved on the support rod (31); a locking thread (32) is arranged on the outer side of the support rod (31); the locking thread (32) is arranged corresponding to the modular component; and a locking nut (33) is threadedly connected to the outer side of the locking thread (32).

9. A multi-stage variable frequency water supply pump according to claim 8, characterized in that: The left side of the base (1) is slidably connected to a slide rod (11), and a support sleeve (12) is provided on the left side of the slide rod (11). The support sleeve (12) can be sleeved on the support rod (31).

10. A multi-stage variable frequency water supply pump according to claim 9, characterized in that: A connecting shaft is rotatably mounted inside the water outlet portion (3), the connecting shaft being connected to the output end of the motor (2) via a coupling, and a spline shaft hole (542) is also provided at one end of the connecting shaft away from the motor (2).

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