Vertical multi-stage centrifugal pump

Abstract

The invention relates to the technical field of hydraulic engineering mechanical equipment, in particular to a vertical multi-stage centrifugal pump which comprises a motor and further comprises a pump body mechanism, the pump body mechanism is in transmission connection with the motor, and the pump body mechanism comprises a bearing assembly and a telescopic positioning assembly. The bearing assembly is used for extruding internal air and sucking water flow in a centrifugal negative pressure mode. The telescopic positioning assembly is used for improving the negative pressure water pumping capacity of the bearing assembly in the rotating process of the motor. And the damping mechanism is fixedly arranged on one side of the pump body mechanism and is in transmission connection with the motor, and the damping mechanism is used for gradually starting to enhance the adjustment of the stability of the bearing assembly after the motor starts to rotate. And in cooperation with the telescopic positioning assembly, the negative-pressure water pumping capacity of the bearing assembly can be improved in the rotating process of the motor, and the water pumping efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic engineering mechanical equipment, in particular to a vertical multi-stage centrifugal pump. Background Art

[0002] As we all know, with the rapid development of modern industry, various devices are becoming larger, and large multi-stage centrifugal pumps are used in large quantities in the fields of petrochemical, thermal power, nuclear power, etc., and the efficiency requirements for large multi-stage centrifugal pumps are getting higher and higher. For large multi-stage centrifugal pumps, if one efficiency point is increased, a single pump unit can save about one million kilowatts of electricity per year. Only by redesigning the key parts of the pump, improving the efficiency of the pump unit, and increasing the safety and reliability of the pump unit, can the competitiveness of multi-stage centrifugal pumps in various fields be improved and energy-saving requirements be achieved.

[0003] A Chinese patent with a grant announcement number of CN219840823U discloses a multistage centrifugal pump for pumping liquids with a permanent temperature of at least 180°C. The multistage centrifugal pump comprises an electric motor and a pump head, the pump head comprising a pump housing and a pipe bushing, the pipe bushing being connected to the pump housing at a first axial end and being closed by a cover plate at a second axial end opposite to the first axial end. The pipe bushing defines a pump chamber in its interior, the pump chamber having two or more pump stages, each pump stage comprising an impeller driven by the electric motor. A potential leakage path between the pump chamber and the outside of the pipe bushing is sealed in a liquid-tight manner by means of an inner annular seal. The inner annular seal is made of EPDM rubber, and the leakage path is additionally sealed in an airtight manner by means of an outer annular seal made of a different rubber material. The outer annular seal is arranged at a position further outward than the inner annular seal along the leakage path to protect the inner annular seal from air.

[0004] However, the prior art still has some problems: the multi-stage centrifugal pump cannot enhance the shock absorbing effect of the centrifugal pump itself during use, and cannot simultaneously enhance the water pumping effect of the centrifugal pump itself. Summary of the invention

[0005] In view of the above problems in the prior art, the present invention is proposed.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a vertical multi-stage centrifugal pump, comprising a motor and a pump body mechanism, wherein the pump body mechanism is transmission-connected to the motor, the pump body mechanism comprises a bearing assembly and a telescopic positioning assembly, the bearing assembly is used to squeeze the internal air and suck the water flow by means of centrifugal negative pressure, and the telescopic positioning assembly is used to improve the negative pressure water pumping capacity of the bearing assembly during the rotation of the motor; The bearing assembly includes a pump body, and the telescopic positioning assembly includes a mounting tube arranged at one end of the pump body, a fixing sleeve with a cavity therein is fixedly provided at the axis center of the mounting tube, a mounting sleeve is rotatably provided in the fixing sleeve, an inner wall of the mounting sleeve is provided with an inner thread, a transmission shaft is rotatably provided in the pump body, an outer wall of one end of the transmission shaft is provided with an outer thread that meshes with the inner thread, a limit seat for limiting the position of the transmission shaft is also provided in the mounting tube, and the transmission shaft is rotatably connected to the limit seat.

[0007] A shock absorbing mechanism is fixedly arranged on one side of the pump body mechanism and is transmission-connected to the motor, and is used for gradually enhancing the regulation of the stability of the bearing assembly after the motor starts to rotate.

[0008] As a preferred solution of the vertical multi-stage centrifugal pump of the present invention, wherein: mounting frames are symmetrically fixed at both ends of the pump body, and the two mounting frames are connected to each other by a plurality of support rods to increase the stability of the pump body; An inlet pipe and an outlet pipe are respectively provided on the outer wall of the pump body, and the inlet pipe and the outlet pipe are both connected to the inner cavity of the pump body. A limit seat 2 is fixedly provided in the inner cavity of the pump body, and a transmission shaft is movably provided in the limit seat 2. Two centrifugal components are rotatably provided in the pump body, and the two centrifugal components are transmission-connected to the transmission shaft.

[0009] As a preferred embodiment of the vertical multi-stage centrifugal pump described in the present invention, the centrifugal assembly includes a centrifugal water wheel rotatably arranged on the inner wall of the pump body, a locking member is fixedly provided on one side of the centrifugal water wheel, the locking member includes a mounting plate and a limit plate, there are two mounting plates in total and the two mounting plates are symmetrically arranged on both sides of the limit plate, a circular through hole is opened in the center of the mounting plate, and a gear-shaped through hole is opened in the center of the limit plate.

[0010] As a preferred solution of the vertical multi-stage centrifugal pump described in the present invention, a snap-fitting tooth body is sleeved on the outer wall of the transmission shaft, the front projection of the snap-fitting tooth body is gear-shaped, and the cross-sectional size of the snap-fitting tooth body is consistent with the size of the gear-shaped through hole on the limit plate.

[0011] As a preferred embodiment of the vertical multi-stage centrifugal pump described in the present invention, the shock absorbing mechanism includes a shock absorbing member fixedly arranged at the other end of the pump body, and the shock absorbing member is used to enhance or weaken the shock absorbing effect of the pump body according to the state of the motor being turned off or on. A connecting tube is sleeved on the outer wall of one end of the transmission shaft extending out of the pump body, and the connecting tube is slidably connected to the shock absorbing member.

[0012] As a preferred solution of the vertical multistage centrifugal pump described in the present invention, the shock absorbing member includes a mounting plate fixedly arranged on one side of the pump body by bolts, the cross section of the mounting plate is T-shaped, the mounting plate is divided into a shoulder and a waist, a plurality of fixing seats 1 are evenly arranged on the side of the waist of the mounting plate, a hinged rod 2 is hingedly arranged on the fixing seat 1, and the other end of the hinged rod 2 is movably connected to the bottom end of the shoulder of the mounting plate; The outer wall of the connecting tube is sleeved with a collar, and a plurality of mounting seats 2 are evenly arranged on the collar, and a hinged rod 1 is hingedly arranged on the mounting seat 2, and the other end of the hinged rod 1 is hingedly connected to one end of the hinged rod 2; A cylindrical slide groove is provided on the installation disk, and the connecting cylinder is located in the cylindrical slide groove and movably connected to the installation disk.

[0013] As a preferred embodiment of the vertical multi-stage centrifugal pump described in the present invention, permanent magnet 1 is provided on the output end of the motor, permanent magnet 2 is provided at the end of the connecting tube away from the transmission shaft, one end of the permanent magnet 2 extends to the inner wall of the recess of permanent magnet 1 without contacting it, and permanent magnet 1 is magnetically coupled with permanent magnet 2.

[0014] As a preferred solution of the vertical multi-stage centrifugal pump described in the present invention, it also includes a threaded shaft, the friction force between the mounting sleeve and the fixed sleeve is greater than the thread engagement force between the threaded shaft and the mounting sleeve, and when the transmission shaft rotates, it first drives the threaded shaft and the mounting sleeve to engage to the maximum pre-tightening force, and when the maximum pre-tightening force is reached, it drives the mounting sleeve to rotate synchronously in the fixed sleeve.

[0015] Beneficial effects of the present invention: The present invention uses the centrifugal negative pressure of the load-bearing component to squeeze the internal air and suck in the water flow, and cooperates with the telescopic positioning component to improve the negative pressure pumping capacity of the load-bearing component during the rotation of the motor, thereby improving the pumping efficiency; at the same time, the mounting frames at both ends of the pump body of the load-bearing component are connected by multiple support rods, thereby enhancing the stability of the pump body; the locking piece design of the centrifugal component makes the connection of the centrifugal water wheel more stable, thereby ensuring the stable operation of the centrifugal pump; and through the threaded engagement of the mounting sleeve of the telescopic positioning component with the transmission shaft, the position of the transmission shaft can be adjusted as needed, thereby optimizing the working state of the centrifugal pump; and the shock absorbing mechanism is used to enhance or weaken the shock absorbing effect of the pump body according to the closed or open state of the motor, thereby reducing the vibration caused by the rotation of the motor and extending the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0018] Figure 2 For the present invention Figure 1 Schematic diagram of the cross-sectional structure of the overall structure.

[0019] Figure 3 It is a structural schematic diagram of the shock absorbing mechanism in the present invention.

[0020] Figure 4 It is a schematic diagram of the explosion structure of the centrifugal assembly of the present invention.

[0021] Figure 5 For the present invention Figure 2 Schematic diagram of the enlarged structure at point A in the middle.

[0022] Figure 6 For the present invention Figure 4 Structural diagram of the combined installation.

[0023] Figure 7 It is a schematic diagram of the structure of the shock absorbing assembly in the present invention.

[0024] Explanation of the reference numerals: 100, pump body mechanism; 101, pump body; 102, mounting frame; 103, support rod; 104, water inlet pipe; 105, water outlet pipe; 106, telescopic positioning assembly; 1061, mounting cylinder; 1062, fixing sleeve; 1063, mounting sleeve; 1064, threaded shaft; 1065, limit seat one; 107, limit seat two; 108, transmission shaft; 109, centrifugal assembly; 1091, centrifugal water wheel; 1092, mounting plate; 1093, limit plate; 200, shock absorbing mechanism; 201, hinged rod one; 202, collar; 203, mounting plate; 204, fixing seat one; 205, hinged rod two; 206, mounting seat two; 207, snap-on gear body; 208, connecting cylinder. DETAILED DESCRIPTION

[0025] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0026] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0027] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0028] Example 1

[0029] Reference Figure 1-Figure 4 , which is the first embodiment of the present invention, provides a vertical multi-stage centrifugal pump.

[0030] Specifically, it includes a motor and: A pump body mechanism 100, the pump body mechanism 100 is transmission-connected to the motor, the pump body mechanism 100 comprises a bearing assembly and a telescopic positioning assembly 106, the bearing assembly is used to squeeze the internal air and suck the water flow by means of centrifugal negative pressure, and the telescopic positioning assembly 106 is used to improve the negative pressure water pumping capacity of the bearing assembly during the rotation of the motor; The shock absorbing mechanism 200 is fixedly arranged on one side of the pump body mechanism 100 and is transmission-connected to the motor. The shock absorbing mechanism 200 is used for gradually enhancing the regulation of the stability of the bearing assembly after the motor starts to rotate.

[0031] The bearing assembly includes a pump body 101, and mounting brackets 102 are symmetrically fixed at both ends of the pump body 101. The two mounting brackets 102 are connected to each other through a plurality of support rods 103 to increase the stability of the pump body 101; An inlet pipe 104 and an outlet pipe 105 are respectively provided on the outer wall of the pump body 101, and the inlet pipe 104 and the outlet pipe 105 are both connected to the inner cavity of the pump body 101. A second limit seat 107 is also fixedly provided in the inner cavity of the pump body 101, and a transmission shaft 108 is movably provided in the second limit seat 107. Two centrifugal components 109 are rotatably provided in the pump body 101, and the two centrifugal components 109 are transmission-connected to the transmission shaft 108.

[0032] like Figure 2 , Figure 4 , Figure 6As shown, the centrifugal assembly 109 includes a centrifugal water wheel 1091 rotatably arranged on the inner wall of the pump body 101, and a locking member is fixedly arranged on one side of the centrifugal water wheel 1091, and the locking member includes a mounting plate 1092 and a limiting plate 1093. There are two mounting plates 1092 in total, and the two mounting plates 1092 are symmetrically arranged on both sides of the limiting plate 1093. A circular through hole is opened in the center of the mounting plate 1092, and a gear-shaped through hole is opened in the center of the limiting plate 1093.

[0033] Among them, the pump body 101 is the core component of the entire vertical multi-stage centrifugal pump, and the mounting frames 102 symmetrically installed at both ends play a key supporting role. These mounting frames 102 are made of high-strength metal materials, have good rigidity and stability, and can withstand various forces generated by the pump body 101 during operation. Multiple support rods 103 are evenly distributed between the two mounting frames 102. They are tightly fixed to the mounting frames 102 by welding or bolting to form a stable frame structure, which effectively enhances the overall stability of the pump body 101 and ensures that it will not shake or move during high-speed operation.

[0034] The transmission shaft 108 passes through the inner cavity of the pump body 101 and can move flexibly in the limit seat 107. The limit seat 107 is made of wear-resistant alloy material, and the high-precision bearing inside it can provide stable support for the transmission shaft 108, while ensuring that the transmission shaft 108 can rotate smoothly. The centrifugal water wheel 1091 in the centrifugal assembly 109 is a key component to realize the pumping function. It is efficiently connected to the transmission shaft 108 through a uniquely designed locking piece. The locking piece is composed of mounting plates 1092 on both sides and a limiting plate 1093 in the middle. The circular through hole in the center of the mounting plate 1092 is precisely matched with the outer diameter of the transmission shaft 108 to ensure that the transmission shaft 108 can pass through tightly. The gear-shaped through hole in the center of the limiting plate 1093 is precisely meshed with the engaging tooth body 207 on the transmission shaft 108. When the transmission shaft 108 rotates, the centrifugal water wheel 1091 can be driven to rotate synchronously at high speed through the interaction between the engaging tooth body 207 and the limiting plate 1093; like Figure 2 , Figure 5 As shown, the telescopic positioning assembly 106 includes a mounting cylinder 1061 arranged at one end of the pump body 101, a fixing sleeve 1062 with an internal cavity is fixedly provided at the axis center of the mounting cylinder 1061, a mounting sleeve 1063 is rotatably provided in the fixing sleeve 1062, the inner wall of the mounting sleeve 1063 is provided with an internal thread, a transmission shaft 108 is rotatably provided in the pump body 101, an outer wall of one end of the transmission shaft 108 is provided with an external thread that meshes with the internal thread, a limit seat 1065 for limiting the position of the transmission shaft 108 is also provided in the mounting cylinder 1061, and the transmission shaft 108 is rotatably connected to the limit seat 1065.

[0035] Among them, at one end of the pump body 101, the fixing sleeve 1062 fixed at the central axis of the mounting cylinder 1061 is made of high-strength alloy steel with extremely low surface roughness to ensure that the mounting sleeve 1063 can rotate smoothly therein. The inner wall of the mounting sleeve 1063 is processed with high-precision internal threads, which cooperate with the external threads at one end of the transmission shaft 108 to form a precise screw transmission mechanism. When the transmission shaft 108 rotates, the rotation or axial movement of the mounting sleeve 1063 can be achieved through the meshing action of the threads.

[0036] The limit seat 1065 is installed in the installation cylinder 1061. It is made of a special composite material with good wear resistance and self-lubricating properties. The limit seat 1065 can accurately limit the position of the transmission shaft 108 so that it can only rotate and translate in the specified axial direction, thereby ensuring the accuracy and stability of the entire telescopic positioning assembly 106; like Figure 3 , Figure 4 As shown, a locking tooth body 207 is sleeved on the outer wall of the transmission shaft 108, and the front projection of the locking tooth body 207 is gear-shaped. The cross-sectional size of the locking tooth body 207 is consistent with the size of the gear-shaped through hole on the limiting plate 1093; In summary, when the motor is powered on, the stator winding inside the motor will generate a rotating magnetic field, which will drive the rotor to rotate at high speed. The rotor of the motor is connected to the transmission shaft 108 of the pump body mechanism 100 through a transmission device such as a coupling or a belt, and the torque generated by the motor is accurately transmitted to the transmission shaft 108. At the moment of starting, due to the large torque output by the motor, the inertia of the transmission shaft 108 can be quickly overcome, causing it to start to rotate rapidly, providing power for subsequent pumping work.

[0037] As the transmission shaft 108 rotates at high speed, the centrifugal water wheel 1091 in the centrifugal assembly 109 is driven to rotate at high speed under the close cooperation of the engaging gear body 207 and the limiting plate 1093. The blades of the centrifugal water wheel 1091 adopt a special streamlined design, which can generate a strong centrifugal force when rotating at high speed. This centrifugal force will quickly squeeze the air inside the pump body 101 outward, so that a relatively low-pressure environment is formed inside the pump body 101.

[0038] Under the action of atmospheric pressure, the external water will quickly flow into the pump body 101 from the water inlet pipe 104. Under the continuous action of centrifugal force, the water entering the pump body 101 is accelerated and thrown to the surroundings, and then discharged at high speed through the water outlet pipe 105 along the flow channel inside the pump body, thereby realizing an efficient water pumping process.

[0039] During the continuous rotation of the motor, the transmission shaft 108 also rotates continuously. Since there is a large friction force between the installation sleeve 1063 and the fixing sleeve 1062, and this friction force is greater than the thread engagement force between the threaded shaft 1064 and the installation sleeve 1063, when the transmission shaft 108 starts to rotate, it first drives its own thread to engage with the installation sleeve 1063.

[0040] As the transmission shaft 108 rotates continuously, the thread and the mounting sleeve 1063 gradually mesh to the maximum preload force. When the maximum preload force is reached, the continued rotation of the transmission shaft 108 will overcome the friction between the mounting sleeve 1063 and the fixed sleeve 1062, driving the mounting sleeve 1063 to rotate synchronously in the fixed sleeve 1062. In this process, due to the threaded connection between the mounting sleeve 1063 and the transmission shaft 108, the rotation of the mounting sleeve 1063 will cause the transmission shaft 108 to perform axial translational motion under the restriction of the stop seat 1065.

[0041] The change in the position of the transmission shaft 108 will directly change the working state of the centrifugal assembly 109. For example, the relative position of the centrifugal water wheel 1091 and the internal flow channel of the pump body 101 is adjusted to optimize the flow path and speed of the water flow, thereby improving the negative pressure pumping capacity of the bearing assembly and achieving precise adjustment of the pumping efficiency.

[0042] Example 2

[0043] Reference Figure 2-3 , Figure 5 to Figure 7 , which is the second embodiment of the present invention, and this embodiment is based on the previous embodiment.

[0044] Specifically, the shock absorbing mechanism 200 includes a shock absorbing member fixedly arranged at the other end of the pump body 101, and the shock absorbing member is used to enhance or weaken the shock absorbing effect of the pump body 101 according to the state of the motor being turned off or on. A connecting tube 208 is sleeved on the outer wall of one end of the transmission shaft 108 extending out of the pump body 101, and the connecting tube 208 is slidably connected to the shock absorbing member.

[0045] The shock absorber comprises a mounting plate 203 fixed to one side of the pump body 101 by bolts, the mounting plate 203 has a T-shaped cross section, and is divided into a shoulder portion and a waist portion, and a plurality of fixing seats 1 204 are evenly arranged on the side of the waist portion of the mounting plate 203, and a hinge rod 205 is hingedly arranged on the fixing seat 1 204, and the other end of the hinge rod 205 is movably connected to the bottom end of the shoulder of the mounting plate 203; The outer wall of the connecting tube 208 is sleeved with a collar 202, and a plurality of mounting seats 206 are evenly arranged on the collar 202. A hinge rod 1 201 is hingedly arranged on the mounting seat 206, and the other end of the hinge rod 1 201 is hingedly connected to one end of the hinge rod 2 205; The mounting plate 203 is provided with a cylindrical slide groove, and the connecting tube 208 is located in the cylindrical slide groove and movably connected to the mounting plate 203 .

[0046] A permanent magnet 1 is provided on the output end of the motor, and a permanent magnet 2 is provided at the end of the connecting tube 208 away from the transmission shaft 108. One end of the permanent magnet 2 extends to the inner wall of the recess of the permanent magnet 1 without contacting it, and the permanent magnet 1 is magnetically coupled with the permanent magnet 2.

[0047] The friction force between the mounting sleeve 1063 and the fixed sleeve 1062 is greater than the thread engagement force between the threaded shaft 1064 and the mounting sleeve 1063. When the transmission shaft 108 rotates, it first drives the threaded shaft 1064 and the mounting sleeve 1063 to engage to the maximum pre-tightening force. When the maximum pre-tightening force is reached, it drives the mounting sleeve 1063 to rotate synchronously in the fixed sleeve 1062.

[0048] The shock absorbing mechanism 200 is tightly connected between the pump body mechanism 100 and the motor. The hinge rod 205 is connected to the mounting plate 203 at one end and is provided with an elastic element. The elastic element is made of high-performance rubber material or spring, which can be elastically deformed when vibrated to absorb part of the vibration energy. The damper generates damping force and consumes vibration energy during vibration through the internal liquid or gas medium. The connecting bracket firmly connects the various components together to ensure that the entire shock absorbing mechanism 200 can work together.

[0049] When the motor starts and begins to run, the vibration generated by the motor will be transmitted to the shock absorbing mechanism 200 through the connecting parts. The elastic elements and dampers inside the shock absorbing mechanism 200 will automatically adjust the working state according to the frequency and amplitude of the vibration, and gradually weaken and disperse the vibration generated by the motor through the combined effect of elastic deformation and damping force, thereby effectively enhancing the regulation of the stability of the bearing assembly and ensuring that the pump body mechanism 100 can run smoothly.

[0050] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A vertical multistage centrifugal pump, comprising a motor, characterized in that: Also includes: A pump body mechanism (100), the pump body mechanism (100) being drivingly connected to the motor, the pump body mechanism (100) comprising a bearing assembly and a telescopic positioning assembly (106), the bearing assembly being used to squeeze internal air and suck water into the flow by means of centrifugal negative pressure, the telescopic positioning assembly (106) being used to improve the negative pressure water pumping capacity of the bearing assembly during the rotation of the motor; The bearing assembly comprises a pump body (101), the telescopic positioning assembly (106) comprises a mounting tube (1061) arranged at one end of the pump body (101), a fixing sleeve (1062) with a cavity therein is fixedly provided at the axis of the mounting tube (1061), a mounting sleeve (1063) is rotatably provided in the fixing sleeve (1062), an inner wall of the mounting sleeve (1063) is provided with an internal thread, a transmission shaft (108) is rotatably provided in the pump body (101), an outer wall of one end of the transmission shaft (108) is provided with an external thread that meshes with the internal thread, a limiting seat (1065) for limiting the position of the transmission shaft (108) is also provided in the mounting tube (1061), and the transmission shaft (108) is rotatably connected to the limiting seat (1065); A shock absorbing mechanism (200) is fixedly arranged on one side of the pump body mechanism (100) and is drivingly connected to the motor, and the shock absorbing mechanism (200) is used to gradually enhance the regulation of the stability of the bearing assembly after the motor starts to rotate.

2. A vertical multistage centrifugal pump according to claim 1, characterized in that: Mounting frames (102) are symmetrically fixedly provided at both ends of the pump body (101), and the two mounting frames (102) are connected to each other via a plurality of support rods (103) to increase the stability of the pump body (101); An inlet pipe (104) and an outlet pipe (105) are respectively provided on the outer wall of the pump body (101); the inlet pipe (104) and the outlet pipe (105) are both connected to the inner cavity of the pump body (101); a second limit seat (107) is fixedly provided in the inner cavity of the pump body (101); a transmission shaft (108) is movably provided in the second limit seat (107); two centrifugal assemblies (109) are rotatably provided in the pump body (101); the two centrifugal assemblies (109) are transmission-connected to the transmission shaft (108).

3. A vertical multistage centrifugal pump as claimed in claim 2, characterized in that: The centrifugal assembly (109) comprises a centrifugal water wheel (1091) rotatably arranged on the inner wall of the pump body (101); a locking member is fixedly arranged on one side of the centrifugal water wheel (1091); the locking member comprises a mounting plate (1092) and a limiting plate (1093); there are two mounting plates (1092) in total and the two mounting plates (1092) are symmetrically arranged on both sides of the limiting plate (1093); a circular through hole is opened at the center of the mounting plate (1092); and a gear-shaped through hole is opened at the center of the limiting plate (1093).

4. A vertical multistage centrifugal pump as claimed in claim 3, characterized in that: An engaging tooth body (207) is sleeved on the outer wall of the transmission shaft (108); the front projection of the engaging tooth body (207) is gear-shaped; and the cross-sectional size of the engaging tooth body (207) is consistent with the size of the gear-shaped through hole on the limiting plate (1093).

5. A vertical multistage centrifugal pump according to claim 1, characterized in that: The shock absorbing mechanism (200) comprises a shock absorbing member fixedly arranged at the other end of the pump body (101), the shock absorbing member being used to enhance or weaken the shock absorbing effect of the pump body (101) according to the state of the motor being turned off or on, and a connecting tube (208) is sleeved on the outer wall of one end of the transmission shaft (108) extending out of the pump body (101), and the connecting tube (208) is slidably connected to the shock absorbing member.

6. A vertical multistage centrifugal pump as claimed in claim 5, characterized in that: The shock absorbing member comprises a mounting plate (203) fixed to one side of the pump body (101) by bolts, the mounting plate (203) having a T-shaped cross section, the mounting plate (203) being divided into a shoulder portion and a waist portion, a plurality of fixing seats (204) being evenly arranged on the side of the waist portion of the mounting plate (203), a hinged rod (205) being hingedly arranged on the fixing seat (204), and the other end of the hinged rod (205) being movably connected to the bottom end of the shoulder portion of the mounting plate (203); The outer wall of the connecting tube (208) is sleeved with a collar (202), a plurality of mounting seats (206) are evenly arranged on the collar (202), a hinged rod (201) is hingedly arranged on the mounting seat (206), and the other end of the hinged rod (201) is hingedly connected to one end of the hinged rod (205); A cylindrical slide groove is provided on the installation disk (203), and the connecting tube (208) is located in the cylindrical slide groove and is movably connected to the installation disk (203).

7. A vertical multistage centrifugal pump according to claim 6, characterized in that: A permanent magnet 1 is provided on the output end of the motor, a permanent magnet 2 is provided on one end of the connecting tube (208) away from the transmission shaft (108), one end of the permanent magnet 2 extends to the inner wall of the notch of the permanent magnet 1 without contacting it, and the permanent magnet 1 is magnetically coupled to the permanent magnet 2.

8. A vertical multistage centrifugal pump as claimed in claim 5, characterized in that: It also includes a threaded shaft (1064), wherein the friction force between the installation sleeve (1063) and the fixed sleeve (1062) is greater than the thread engagement force between the threaded shaft (1064) and the installation sleeve (1063); when the transmission shaft (108) rotates, the threaded shaft (1064) and the installation sleeve (1063) are first driven to engage to a maximum preload force, and when the maximum preload force is reached, the installation sleeve (1063) is driven to rotate synchronously within the fixed sleeve (1062).

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