A vertical multi-stage centrifugal pump

Abstract

The present invention relates to the technical field of hydraulic engineering machinery and equipment, and in particular to 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 internal air and suck water into a flow by means of centrifugal negative pressure, and the telescopic positioning assembly is used to improve the negative pressure pumping capacity of the bearing assembly during the rotation of the motor; a shock absorbing mechanism, wherein the shock absorbing mechanism is fixedly arranged on one side of the pump body mechanism and transmission-connected to the motor, and the shock absorbing mechanism is used to gradually enhance the regulation of the stability of the bearing assembly after the motor starts to rotate. The present invention uses the bearing assembly to squeeze internal air and suck water into a flow by means of centrifugal negative pressure, and cooperates with the telescopic positioning assembly to improve the negative pressure pumping capacity of the bearing assembly during the rotation of the motor, thereby improving the pumping efficiency.

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;

[0007] 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.

[0008] 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.

[0009] 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;

[0010] 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.

[0011] 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.

[0012] 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.

[0013] 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.

[0014] As a preferred solution of the vertical multi-stage centrifugal pump of the present invention, wherein: the shock-absorbing member includes a mounting plate fixedly provided on one side of the pump body through bolts, the cross-section of the mounting plate is T-shaped, the mounting plate is divided into a shoulder portion and a waist portion, a plurality of first fixing seats are uniformly provided on the side of the waist of the mounting plate, a second articulated rod is hingedly provided on the first fixing seat, and the other end of the second articulated rod is movably connected to the bottom end of the shoulder of the mounting plate;

[0015] A collar is sleeved on the outer wall of the connecting cylinder, a plurality of second mounting seats are uniformly provided on the collar, a first articulated rod is hingedly provided on the second mounting seat, and the other end of the first articulated rod is hingedly connected to one end of the second articulated rod;

[0016] A cylindrical chute is provided on the mounting plate, and the connecting cylinder is located in the cylindrical chute and is movably connected to the mounting plate.

[0017] As a preferred solution of the vertical multi-stage centrifugal pump of the present invention, wherein: a first permanent magnet is provided on the output end of the motor, a second permanent magnet is provided at one end of the connecting cylinder away from the transmission shaft, one end of the second permanent magnet extends to the inner wall of the notch of the first permanent magnet and does not contact, and the first permanent magnet and the second permanent magnet are magnetically coupled.

[0018] As a preferred solution of the vertical multi-stage centrifugal pump of the present invention, wherein: it further includes a threaded shaft, the frictional force between the mounting sleeve and the fixed sleeve is greater than the threaded engagement force between the threaded shaft and the mounting sleeve. When the transmission shaft rotates, it first drives the threaded shaft to engage with the mounting sleeve to the maximum pre-tightening force. When the maximum pre-tightening force is reached, it drives the mounting sleeve to rotate synchronously within the fixed sleeve.

[0019] Advantages of the present invention:

[0020] In the present invention, the internal air is squeezed and water flow is sucked in through the centrifugal negative pressure of the bearing assembly. In cooperation with the telescopic positioning assembly, the negative pressure water pumping capacity of the bearing assembly can be improved during the rotation of the motor, and the pumping efficiency can be enhanced; at the same time, the mounting brackets at both ends of the pump body of the bearing assembly are connected by a plurality of support rods, enhancing the stability of the pump body; the locking member design of the centrifugal assembly makes the connection of the centrifugal water wheel more stable, ensuring the stable operation of the centrifugal pump; and through the threaded engagement of the mounting sleeve of the telescopic positioning assembly and the transmission shaft, the position of the transmission shaft can be adjusted according to needs, thereby optimizing the working state of the centrifugal pump; also, through the shock-absorbing mechanism, the shock-absorbing effect on the pump body is enhanced or weakened according to the off or on state of the motor, reducing the vibration generated by the rotation of the motor and extending the service life of the equipment. Description of the Drawings

[0021] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0023] Figure 2 For the present invention Figure 1 It is a schematic cross-sectional structure diagram of the overall structure in the present invention.

[0024] Figure 3 It is a schematic diagram of the structure of the shock absorption mechanism in the present invention.

[0025] Figure 4 It is an exploded structure diagram of the centrifugal component of the present invention.

[0026] Figure 5 For the present invention Figure 2 It is an enlarged structure diagram of part A in the present invention.

[0027] Figure 6 For the present invention Figure 4 It is a schematic diagram of the combined installation structure in the present invention.

[0028] Figure 7 It is a schematic diagram of the structure of the shock absorption component in the present invention.

[0029] Explanation of 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 component; 1061, mounting cylinder; 1062, fixed sleeve; 1063, mounting sleeve; 1064, threaded shaft; 1065, first limit seat; 107, second limit seat; 108, drive shaft; 109, centrifugal component; 1091, centrifugal water wheel; 1092, mounting plate; 1093, limit plate; 200, shock absorption mechanism; 201, first articulated rod; 202, collar; 203, mounting disc; 204, first fixed seat; 205, second articulated rod; 206, second mounting seat; 207, engaging tooth body; 208, connecting cylinder. Detailed implementation manners

[0030] To make the above objects, features, and advantages of the present invention more obvious and understandable, the following will give a detailed description of the specific implementation manners of the present invention in conjunction with the drawings in the specification.

[0031] In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, the present invention may be practiced in other ways different from those described herein. Persons skilled in the art can make similar generalizations without departing from the spirit of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0032] Secondly, as used herein, an "embodiment" or "an embodiment" refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The appearances of "in an embodiment" in different places in this specification do not all refer to the same embodiment, nor are they separate or alternative embodiments that are mutually exclusive of other embodiments.

[0033] Embodiment 1

[0034] Referring to Figures 1-4 , this is the first embodiment of the present invention, and this embodiment provides a vertical multistage centrifugal pump.

[0035] Specifically, it includes a motor, and further includes:

[0036] A pump body mechanism 100, the pump body mechanism 100 is drivingly connected to the motor, the pump body mechanism 100 includes a bearing assembly and a telescopic positioning assembly 106, the bearing assembly is used to squeeze and suck water flow by means of centrifugal negative pressure, and the telescopic positioning assembly 106 is used to improve the negative pressure water pumping ability of the bearing assembly during the rotation of the motor;

[0037] A shock absorption mechanism 200, the shock absorption mechanism 200 is fixedly arranged on one side of the pump body mechanism 100 and is drivingly connected to the motor, and the shock absorption mechanism 200 is used to gradually enhance the adjustment of the stability of the bearing assembly after the motor starts to rotate.

[0038] The bearing assembly includes a pump body 101, mounting brackets 102 are symmetrically and fixedly arranged at both ends of the pump body 101, and a plurality of support rods 103 are connected to each other between the two mounting brackets 102 to increase the stability of the pump body 101;

[0039] An inlet pipe 104 and an outlet pipe 105 are respectively provided on the outer wall of the pump body 101, both the inlet pipe 104 and the outlet pipe 105 communicate with the inner cavity of the pump body 101, a second limit seat 107 is fixedly arranged in the inner cavity of the pump body 101, a transmission shaft 108 is movably arranged in the second limit seat 107, and two centrifugal components 109 are rotatably arranged in the pump body 101, and the two centrifugal components 109 are drivingly connected to the transmission shaft 108.

[0040] As Figure 2 , Figure 4 , Figure 6As shown, the centrifugal assembly 109 includes a centrifugal water wheel 1091 rotatably provided on the inner wall of the pump body 101. A locking member is fixedly provided on one side of the centrifugal water wheel 1091. 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 formed in the center of the mounting plate 1092, and a gear-shaped through hole is formed in the center of the limiting plate 1093.

[0041] Among them, the pump body 101 is the core component of the entire vertical multi-stage centrifugal pump. The mounting brackets 102 symmetrically installed at both ends play a key supporting role. These mounting brackets 102 are made of high-strength metal materials, with good rigidity and stability, and can withstand various forces generated during the operation of the pump body 101. A plurality of support rods 103 are evenly distributed between the two mounting brackets 102. They are tightly fixed to the mounting brackets 102 by welding or bolt connection to form a stable frame structure, effectively enhancing the overall stability of the pump body 101 and ensuring that it does not shake or displace during high-speed operation.

[0042] The transmission shaft 108 penetrates through the inner cavity of the pump body 101 and can move flexibly within the second limiting seat 107. The second limiting seat 107 is made of wear-resistant alloy material, and the high-precision bearings inside can provide stable support for the transmission shaft 108 and ensure that the transmission shaft 108 can rotate smoothly. The centrifugal water wheel 1091 in the centrifugal assembly 109 is the key component to achieve the water pumping function. It is efficiently connected to the transmission shaft 108 through a uniquely designed locking member. The locking member consists of the mounting plates 1092 on both sides and the limiting plate 1093 in the middle. The circular through hole in the center of the mounting plate 1092 precisely matches 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 precisely meshes with the clamping tooth body 207 on the transmission shaft 108. When the transmission shaft 108 rotates, it can drive the centrifugal water wheel 1091 to rotate synchronously at high speed through the interaction between the clamping tooth body 207 and the limiting plate 1093;

[0043] As Figure 2 、 Figure 5As shown, the telescopic positioning assembly 106 includes an installation cylinder 1061 provided at one end of the pump body 101. A fixed sleeve 1062 with an internal cavity is fixedly provided at the axis of the installation cylinder 1061. An installation sleeve 1063 is rotatably provided within the fixed sleeve 1062. The inner wall of the installation sleeve 1063 is provided with internal threads. A transmission shaft 108 is rotatably provided within the pump body 101. An external thread that meshes with the internal threads is provided on the outer wall of one end of the transmission shaft 108. A first limit seat 1065 for restricting the position of the transmission shaft 108 is further provided within the installation cylinder 1061. The transmission shaft 108 is rotatably connected to the first limit seat 1065.

[0044] Among them, at one end of the pump body 101, the fixed sleeve 1062 fixed at the central axis inside the installation cylinder 1061 is made of high-strength alloy steel with an extremely low surface roughness to ensure that the installation sleeve 1063 can rotate smoothly therein. The inner wall of the installation sleeve 1063 is machined with high-precision internal threads, which cooperate with the external threads at one end of the transmission shaft 108 to form a precise screw drive mechanism. When the transmission shaft 108 rotates, through the meshing action of the threads, the rotation or axial movement of the installation sleeve 1063 can be achieved.

[0045] The first limit seat 1065 is installed within the installation cylinder 1061. It is made of a special composite material and has good wear resistance and self-lubrication properties. The first limit seat 1065 can accurately restrict the position of the transmission shaft 108, enabling it to only rotate and translate in the specified axial direction, thus ensuring the accuracy and stability of the operation of the entire telescopic positioning assembly 106;

[0046] As Figure 3 、 Figure 4 shown, a clamping tooth body 207 is sleeved on the outer wall of the transmission shaft 108. The front projection of the clamping tooth body 207 is gear-shaped. The cross-sectional size of the clamping tooth body 207 is the same as the size of the gear-shaped through hole on the limit plate 1093;

[0047] 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 coupling or a belt and other transmission devices, and accurately transmits the torque generated by the motor to the transmission shaft 108. At the moment of startup, due to the relatively large torque output by the motor, it can quickly overcome the inertia of the transmission shaft 108 and make it start to rotate rapidly, providing power for the subsequent pumping work.

[0048] With the high-speed rotation of the transmission shaft 108, the centrifugal water wheel 1091 in the centrifugal assembly 109 is driven to rotate at high speed together under the tight fit of the clamping tooth body 207 and the limiting plate 1093. The blades of the centrifugal water wheel 1091 adopt a special streamline 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 outwards, creating a relatively low-pressure environment inside the pump body 101.

[0049] Under the action of atmospheric pressure, the external water flow will quickly rush into the pump body 101 from the water inlet pipe 104. The water flow entering the pump body 101 is continuously accelerated and thrown to the surroundings under the action of the centrifugal force, and then discharged at high speed through the water outlet pipe 105 along the flow channel inside the pump body, thus realizing an efficient water pumping process.

[0050] During the continuous rotation of the motor, the transmission shaft 108 is also constantly rotating. Since there is a large frictional force between the mounting sleeve 1063 and the fixed sleeve 1062, and this frictional force is greater than the thread engagement force between the threaded shaft 1064 and the mounting sleeve 1063. Therefore, when the transmission shaft 108 starts to rotate, it will first drive its own thread to engage with the mounting sleeve 1063.

[0051] With the continuous rotation of the transmission shaft 108, the thread gradually engages with the mounting sleeve 1063 until the maximum pre-tightening force is reached. When this maximum pre-tightening force is reached, the continued rotation of the transmission shaft 108 will overcome the frictional force between the mounting sleeve 1063 and the fixed sleeve 1062, driving the mounting sleeve 1063 to rotate synchronously within the fixed sleeve 1062. During 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 an axial translation movement under the restriction of the limiting seat one 1065.

[0052] The position change of the transmission shaft 108 will directly change the working state of the centrifugal assembly 109. For example, adjusting the relative position of the centrifugal water wheel 1091 and the flow channel inside the pump body 101, optimizing the flow path and speed of the water flow, thereby improving the negative pressure water pumping ability of the bearing assembly and realizing precise adjustment of the water pumping efficiency.

[0053] Embodiment 2

[0054] Refer to Figures 2-3 、 Figures 5-7 This is the second embodiment of the present invention, and this embodiment is based on the previous embodiment.

[0055] Specifically, the shock absorption mechanism 200 includes a shock absorber fixedly provided at the other end of the pump body 101. The shock absorber is used to enhance or weaken the shock absorption effect on the pump body 101 according to the state of the motor being turned off or on. A connecting cylinder 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 cylinder 208 is slidably connected to the shock absorber.

[0056] The shock absorber includes a mounting plate 203 fixedly provided on one side of the pump body 101 by bolts. The cross-section of the mounting plate 203 is T-shaped. The mounting plate 203 is divided into a shoulder part and a waist part. A plurality of first fixing seats 204 are evenly provided on the side of the waist of the mounting plate 203. A second articulated rod 205 is hingedly provided on the first fixing seat 204, and the other end of the second articulated rod 205 is movably connected to the bottom end of the shoulder of the mounting plate 203.

[0057] A collar 202 is sleeved on the outer wall of the connecting cylinder 208. A plurality of second mounting seats 206 are evenly provided on the collar 202. A first articulated rod 201 is hingedly provided on the second mounting seat 206, and the other end of the first articulated rod 201 is hingedly connected to one end of the second articulated rod 205.

[0058] A cylindrical sliding groove is formed on the mounting plate 203, and the connecting cylinder 208 is located in the cylindrical sliding groove and is movably connected to the mounting plate 203.

[0059] A first permanent magnet is provided at the output end of the motor. A second permanent magnet is provided at the end of the connecting cylinder 208 away from the transmission shaft 108. One end of the second permanent magnet extends to the inner wall of the notch of the first permanent magnet and does not touch it, and the first permanent magnet and the second permanent magnet are magnetically coupled.

[0060] The frictional 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 to engage with the mounting sleeve 1063 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.

[0061] Among them, the shock absorption mechanism 200 is tightly connected between the pump body mechanism 100 and the motor. An elastic element is provided at one end of the second articulated rod 205 connecting the mounting plate 203. The elastic element is made of a high-performance rubber material or a spring and can undergo elastic deformation when subjected to vibration and absorb part of the vibration energy. The damper generates a damping force through the internal liquid or gas medium during the vibration process and consumes the vibration energy. The connecting bracket firmly connects each component together to ensure that the entire shock absorption mechanism 200 can work together.

[0062] When the motor starts and begins to operate, the vibration generated by the motor will be transmitted to the shock-absorbing mechanism 200 through the connecting components. The elastic elements and dampers inside the shock-absorbing mechanism 200 will automatically adjust their working states according to the frequency and amplitude of the vibration. Through the combined action of elastic deformation and damping force, the vibration generated by the motor will be gradually weakened and dispersed, thereby effectively enhancing the adjustment of the stability of the bearing assembly and ensuring that the pump body mechanism 100 can operate smoothly.

[0063] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered by the scope of the claims of the present invention.

Claims

1. A vertical multi-stage centrifugal pump, comprising a motor, characterized in that, It also includes: A pump body mechanism (100), the pump body mechanism (100) is drivingly connected to the motor, the pump body mechanism (100) includes a bearing component and a telescopic positioning component (106), the bearing component is used to squeeze and suck water flow by means of centrifugal negative pressure, and the telescopic positioning component (106) is used to improve the negative pressure water pumping capacity of the bearing component during the rotation of the motor; The bearing component includes a pump body (101), the telescopic positioning component (106) includes a mounting cylinder (1061) provided at one end of the pump body (101), a fixed sleeve (1062) with an internal cavity is fixedly provided at the axis of the mounting cylinder (1061), a mounting sleeve (1063) is rotatably provided in the fixed sleeve (1062), an internal thread is provided on the inner wall of the mounting sleeve (1063), a transmission shaft (108) is rotatably provided in the pump body (101), an external thread meshing with the internal thread is provided on the outer wall of one end of the transmission shaft (108), and a first limit seat (1065) for limiting the position of the transmission shaft (108) is further provided in the mounting cylinder (1061), and the transmission shaft (108) is rotatably connected to the first limit seat (1065); A shock absorption mechanism (200), the shock absorption mechanism (200) is fixedly provided on one side of the pump body mechanism (100) and is drivingly connected to the motor, and the shock absorption mechanism (200) is used to gradually enhance the adjustment of the stability of the bearing component after the motor starts to rotate; Mounting brackets (102) are symmetrically and fixedly provided at both ends of the pump body (101), and a plurality of support rods (103) are connected to each other between the two mounting brackets (102) to increase the stability of the pump body (101); An inlet pipe (104) and an outlet pipe (105) are respectively opened on the outer wall of the pump body (101), both the inlet pipe (104) and the outlet pipe (105) communicate with 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), and two centrifugal components (109) are rotatably provided in the pump body (101), and the two centrifugal components (109) are drivingly connected to the transmission shaft (108); The centrifugal component (109) includes a centrifugal water wheel (1091) rotatably provided on the inner wall of the pump body (101), a locking member is fixedly provided on one side of the centrifugal water wheel (1091), 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 provided 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); The shock absorption mechanism (200) includes a shock absorber fixedly provided at the other end of the pump body (101). The shock absorber is used to enhance or weaken the shock absorption effect of the pump body (101) according to the state of the motor being turned off or on. A connecting cylinder (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 cylinder (208) is slidably connected to the shock absorber; The shock absorber includes a mounting plate (203) fixedly provided on one side of the pump body (101) by bolts. The cross-section of the mounting plate (203) is T-shaped. The mounting plate (203) is divided into a shoulder and a waist. A plurality of first fixing seats (204) are evenly provided on the side of the waist of the mounting plate (203). A second articulated rod (205) is hinged on the first fixing seat (204), and the other end of the second articulated rod (205) is movably connected to the bottom end of the shoulder of the mounting plate (203); A collar (202) is sleeved on the outer wall of the connecting cylinder (208). A plurality of second mounting seats (206) are evenly provided on the collar (202). A first articulated rod (201) is hinged on the second mounting seat (206), and the other end of the first articulated rod (201) is hinged to one end of the second articulated rod (205); A cylindrical sliding groove is formed in the mounting plate (203), and the connecting cylinder (208) is located in the cylindrical sliding groove and is movably connected to the mounting plate (203).

2. The vertical multistage centrifugal pump according to claim 1, wherein: A clamping tooth body (207) is sleeved on the outer wall of the transmission shaft (108). The front projection of the clamping tooth body (207) is gear-shaped, and the cross-sectional size of the clamping tooth body (207) is the same as the size of the gear-shaped through hole on the limiting plate (1093).

3. The vertical multi-stage centrifugal pump according to claim 1, characterized in that: A first permanent magnet is provided at the output end of the motor. A second permanent magnet is provided at the end of the connecting cylinder (208) away from the transmission shaft (108). One end of the second permanent magnet extends to the inner wall of the notch of the first permanent magnet and does not touch it, and the first permanent magnet and the second permanent magnet are magnetically coupled.

4. A vertical multistage centrifugal pump according to claim 1, characterized in that: It also includes a threaded shaft (1064). The frictional force between the mounting sleeve (1063) and the fixed sleeve (1062) is greater than the threaded 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) to engage with the mounting sleeve (1063) 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).

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