A high-efficiency multi-stage sealed centrifugal pump

Abstract

The present invention relates to a high-efficiency multi-stage sealed centrifugal pump, which includes a bracket, a driving motor, a coupling, a pump shaft mechanism, a guide vane mechanism and a water inlet mechanism. An overflow chamber and a decompression chamber are provided in the pump. The sealing performance and pressure management ability of the pump are significantly improved through the combined design of the double sealing structure, the overflow chamber and the decompression chamber. This design not only improves the operating stability and service life of the pump, but also simplifies the maintenance process. The reasonable layout of the overflow chamber and the decompression chamber ensures the timely discharge of leaked liquid and excess pressure, and prevents liquid retention and excessive pressure from damaging the pump body and internal components. In summary, the present invention provides an efficient, reliable and easy-to-maintain multi-stage centrifugal pump with broad application prospects.

Description

Technical Field

[0001] The invention relates to the field of centrifugal pumps, in particular to a high-efficiency multi-stage sealed centrifugal pump. Background Art

[0002] Multistage centrifugal pumps are a type of mechanical equipment widely used in industrial and civil fields, mainly used to transport liquid media. Due to their high efficiency, stability and reliable working performance, multistage centrifugal pumps have been widely used in petrochemical, electric power, water supply, drainage and other industries. Multistage centrifugal pumps work in series through multiple impellers, thereby achieving high head and large flow rate liquid transportation. However, traditional multistage centrifugal pumps have some technical bottlenecks in terms of high sealing and leakage prevention, which makes it difficult to meet the requirements in some special application scenarios.

[0003] In view of these problems, the prior art has proposed some improvement schemes, but there are still certain limitations. For example, the patent with publication number CN111997907B discloses a vertical guide vane self-priming centrifugal pump, which drives the centrifugal impeller to rotate through the pump shaft. The inlet of the centrifugal impeller faces downward and is connected to the water inlet to generate centrifugal force to pressurize the liquid. However, it still has the following shortcomings: 1. Poor sealing performance: Existing multi-stage centrifugal pumps usually rely on a single mechanical seal structure to prevent liquid leakage. However, when the pump shaft rotates at high speed, the sealing surface is easily worn, resulting in leakage. A single sealing method is difficult to maintain a good sealing effect in long-term high-load operation. Liquid leakage will not only reduce the working efficiency of the pump, but also cause corrosion and damage to other components inside the pump body. 2. Large pressure fluctuations: During the operation of the multi-stage centrifugal pump, the internal pressure fluctuations often affect the stability and efficiency of the pump. Existing centrifugal pumps often lack effective pressure management means in design, resulting in unstable pressure in the pump. This pressure fluctuation not only affects the performance of the pump, but also increases the stress of the sealing structure and the pump body, leading to early failure of the components.

[0004] Therefore, in view of the above-mentioned problems existing in the existing multi-stage centrifugal pumps, it is necessary to improve them in order to provide a multi-stage centrifugal pump with high sealing performance, reasonable structural design and easy maintenance, so as to improve the working efficiency and service life of the pump and meet various needs in industrial production and life. Summary of the invention

[0005] 1. Technical issues to be resolved

[0006] In view of the deficiencies of the prior art, the present invention aims to provide a high-efficiency multi-stage sealed centrifugal pump, which solves the problems existing in the prior art and significantly improves the sealing performance and diversion efficiency of the multi-stage centrifugal pump by optimizing the pump shaft mechanism, guide vane mechanism and bracket design. The combined design of the double sealing structure and the overflow chamber and the decompression chamber not only significantly improves the sealing performance and pressure management capability of the pump, but also simplifies the maintenance process. The overflow chamber and the decompression chamber ensure that leaked liquid and excess pressure can be quickly discharged from the pump body through reasonable diversion and overflow design, preventing damage to the pump body and internal components caused by liquid retention and excessive pressure.

[0007] (II) Technical solution

[0008] To achieve the above object, the present invention provides the following technical solutions: a high-efficiency multi-stage sealed centrifugal pump, comprising a bracket, a driving motor is fixed to the upper end of the bracket, a coupling is fixed to the end of the output shaft of the driving motor, a pump shaft mechanism is sleeved and fixed to the lower end of the coupling, a guide vane mechanism is arranged on the outer side of the pump shaft mechanism, and a water inlet mechanism is arranged at the lower end of the guide vane mechanism. Among them, the bracket is the basic structure of the pump, which carries and supports all other components. A platform is provided for installing and fixing various components to ensure the stability and structural integrity of the pump as a whole. The driving motor provides the power source required for the operation of the centrifugal pump, and converts electrical energy into mechanical energy through the output shaft. The coupling connects the output shaft of the driving motor and the pump shaft mechanism to transmit the rotational power of the motor. While transmitting power, the coupling can compensate for the axial and radial offsets caused by installation errors or operation, and protect the motor and the pump shaft from excessive stress. The pump shaft mechanism further transmits the power transmitted by the coupling to the impeller, causing it to rotate at high speed, thereby realizing centrifugal transportation of the liquid. The guide vane mechanism is set on the outside of the pump shaft to guide and control the flow direction of the liquid and reduce eddy currents and energy losses in the liquid flow. The guide vane mechanism can improve the efficiency and performance stability of the pump and keep the liquid in a good flow state during the step-by-step increase in the multi-stage centrifugal pump. The water inlet mechanism is set at the lower end of the guide vane mechanism and is responsible for the liquid entering the pump body from the outside.

[0009] Preferably, an overflow cavity is provided inside the bracket, and the overflow cavity is a circular cavity with a notch as a whole, which is used to collect liquid leaked inside the pump due to incomplete sealing. This shape design is not only conducive to collecting and draining leaked liquid, but also can buffer pressure fluctuations in the pump to a certain extent. The circular structure can evenly distribute the pressure, thereby reducing the risk of damage to the sealing structure caused by pressure concentration. The notch can play a buffering role, absorb part of the pressure fluctuations, and ensure the relative stability of the pressure in the pump.

[0010] Preferably, a first guide groove is provided at the bottom of the overflow chamber, and a first overflow hole is provided on the outside of the first guide groove. The overflow chamber as a whole is a circular cavity with a notch, and the shape of the notch can increase the capacity and liquid storage capacity of the overflow chamber. A first guide groove is provided at the bottom of the overflow chamber, and the first guide groove is designed to guide the flow of liquid to ensure that the liquid in the overflow chamber can be discharged smoothly. A first overflow hole is provided on the outside of the first guide groove, and the overflow hole is used for discharge when there is too much liquid to prevent liquid from accumulating in the pump body.

[0011] Preferably, a water outlet cavity is provided on the left side of the bracket, and the water outlet cavity is the outlet flow channel of the entire centrifugal pump.

[0012] Preferably, a decompression chamber is provided at the upper end of the bracket, and the decompression chamber reduces the pressure of the liquid in the pump through a buffering effect; a second guide groove is provided at the bottom of the decompression chamber to guide the flow of the liquid and ensure that the liquid in the decompression chamber can be discharged smoothly. A second overflow hole is provided on the side of the second guide groove to discharge when there is too much liquid in the decompression chamber.

[0013] Preferably, the first guide groove and the second guide groove are tapered grooves that deepen from the axis toward the outside, so as to facilitate the discharge of leaked liquid.

[0014] Preferably, the pump shaft mechanism includes a pump shaft, and the outer edge array of the pump shaft is provided with multiple groups of impellers, and impeller spacers are provided between each group of impellers. The pump shaft is a long shaft made of high-strength material and can withstand high speed and large torque. The pump shaft is connected to the drive motor through a coupling, and the rotational power of the motor is transmitted to the impeller, so that the impeller rotates at high speed. Multiple groups of impellers are arranged in series, so that the liquid is pressurized step by step in each stage of the impeller, and high-lift liquid transportation is achieved. The impeller spacer is an annular kit installed on the pump shaft, which is used to fix and space each group of impellers, ensure that the impellers are arranged on the pump shaft according to the designed spacing, and prevent interference between the impellers. The spacer can help balance the force on the impeller, reduce vibration, and stabilize the operating state of the pump.

[0015] Preferably, the impeller includes a rear cover plate, a plurality of arc-shaped blades are fixed to the upper end of the rear cover plate, and a front cover plate is fixed to the upper end of the blades. The main function of the rear cover plate is to provide support and fixation for the blades and to guide the fluid to the blades. The rear cover plate is made of a strong material to ensure that the impeller can maintain structural stability when rotating at high speed. The blades are in direct contact with the fluid and are responsible for converting kinetic energy into pressure energy. The arc-shaped design of the blades allows the fluid to pass smoothly and generates centrifugal force when the impeller rotates, thereby increasing the pressure and speed of the fluid. The front cover plate is located at the front of the impeller and covers the top of the blades. Its function is to fix the blades and guide the fluid away from the impeller so that it flows to the outlet of the pump.

[0016] Preferably, the plurality of blades radiate from the center to the periphery and are spiral-shaped as a whole. The blades radiate from the center to the outside and are arranged in a spiral shape. This design can effectively increase the rotational kinetic energy and flow rate of the fluid. When the fluid passes through the impeller, the spiral arrangement of the blades can generate a stronger centrifugal force, thereby improving the pressure and speed conversion efficiency of the fluid.

[0017] Preferably, the guide vane mechanism includes a plurality of guide vane units installed step by step at the lower end of the bracket, and a water inlet guide vane is fixed at the lower end of the guide vane unit. The guide vane units are installed at the lower end of the bracket and arranged step by step, so that the fluid can be gradually guided and controlled under different pressure and speed conditions. The step-by-step installation design enables the guide vane mechanism to adapt to different levels of fluid flow and improve the control and guiding effect of the fluid. The water inlet guide vane is mainly used to guide the fluid entering the pump body. It optimizes the entry angle and path of the fluid, reduces the turbulence and energy loss of the fluid, and enables the fluid to enter the pump body more smoothly.

[0018] Preferably, the guide vane unit includes a guide housing and a guide vane cover plate, a plurality of guide vanes are fixed between the guide housing and the guide vane cover plate, and a mouth ring is fixed at the lower end of the guide housing. The guide housing is the outer shell of the guide vane unit, which provides structural support, provides a stable installation foundation for the guide vanes and the guide vane cover plate, and ensures the stable flow of the fluid in the channel. The guide vane cover plate cooperates with the guide housing to fix a plurality of guide vanes. It closes the top of the guide housing so that the fluid flows along a predetermined path in the guide vane unit. The guide vanes are fixed between the guide housing and the guide vane cover plate and are responsible for guiding the direction of the fluid. They optimize the energy transfer and efficiency of the fluid by changing the flow direction and speed of the fluid. The mouth ring is fixed at the lower end of the guide housing and plays a role in sealing and guiding the fluid. It ensures that the fluid maintains a stable flow state when entering the next-level guide vane unit.

[0019] Preferably, a sliding bearing is embedded between every five guide vane units. It is used to support and stabilize the pump shaft and reduce the vibration and deviation of the shaft when it rotates at high speed. The load between the guide vane units at each level will be absorbed and dispersed by the sliding bearing, reducing the pressure of a single guide vane unit and extending the service life of the pump.

[0020] Preferably, a mechanical seal is fixed to the outer edge of the pump shaft, and the mechanical seal is clamped between the bracket and the impeller. The main function of the mechanical seal is to prevent fluid leakage at the outer edge of the pump shaft. It effectively prevents fluid from leaking to the outside by forming a sealing interface between the pump shaft and the pump body (bracket and impeller). The mechanical seal provides excellent leak-proof performance and can maintain a stable sealing effect under high pressure and high temperature conditions.

[0021] Preferably, an oil seal is provided at the contact point between the bottom of the decompression chamber and the pump shaft. The oil seal forms a reliable sealing interface between the decompression chamber and the pump shaft to prevent fluid leakage and improve the sealing performance of the pump.

[0022] Preferably, a plurality of tie rods are fixed between the bracket and the water inlet mechanism, and a baffle is fixed on the outside of the bracket. The tie rods firmly connect the bracket and the water inlet mechanism to provide additional structural support and stability. Through the distribution of the tie rods, the force on the pump during operation can be evenly distributed, reducing local stress concentration. The baffle is fixed on the outside of the bracket to prevent external pollutants (such as dust, silt, etc.) from entering the pump body and keep the inside of the pump clean.

[0023] Preferably, the water inlet mechanism includes a base, and a plurality of water inlets are provided at the bottom and outer edge of the base, and a filter screen is provided on the outside of the water inlet. The base provides a stable support to ensure the stability of the entire water inlet system. The design of multiple water inlets allows the fluid to enter the pump body evenly from different positions, avoiding the problem of uneven flow that may be caused by a single water inlet. The arrangement of the water inlets ensures that the fluid can be evenly distributed before entering the pump body, reducing fluid impact and turbulence, and improving the smooth operation of the pump. The design of the water inlet can guide the fluid to enter the pump body along the optimal path, reducing resistance and energy loss. The filter screen can effectively filter out impurities, particles and other contaminants in the fluid to prevent them from entering the pump body.

[0024] (III) Beneficial effects

[0025] The object of the present invention is to provide a high-efficiency multi-stage sealed centrifugal pump, which significantly improves the sealing performance and diversion efficiency by optimizing the pump shaft mechanism, guide vane mechanism and bracket design. The mechanical seal on the pump shaft effectively prevents liquid leakage, and the reasonable design of the overflow chamber and the decompression chamber further prevents leakage caused by excessive pressure. The guide vane unit and sliding bearing in the guide vane mechanism ensure smooth liquid flow, reduce eddy currents and energy losses, and improve the stability and durability of the structure. Multiple tie rods fix the bracket and the water inlet mechanism, and the baffle protects the internal components, enhancing the stability and sealing of the overall structure. The impeller design with spiral arc blades improves the flow efficiency and the head of the pump. Through these innovative designs, the patented high-seal multi-stage centrifugal pump performs excellently in terms of sealing, high efficiency and long life, and can meet more demanding application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is an overall schematic diagram of the present invention.

[0027] Figure 2 It is a cross-sectional view of the whole of the present invention.

[0028] Figure 3 It is an enlarged view of point A in the present invention.

[0029] Figure 4 It is a cross-sectional view of the bracket in the present invention.

[0030] Figure 5It is a schematic diagram of the pump shaft mechanism in the present invention.

[0031] Figure 6 It is an exploded view of the impeller in the present invention.

[0032] Figure 7 It is a cross-sectional view of the guide vane mechanism in the present invention.

[0033] Figure 8 It is an exploded view of the guide vane unit in the present invention.

[0034] Fig. 9 It is a schematic diagram of the water inlet mechanism in the present invention.

[0035] In the figure: 1- bracket, 2- driving motor, 3- coupling, 4- pump shaft mechanism, 5- guide vane mechanism, 6- water inlet mechanism, 7- mechanical seal, 8- oil seal, 9- pull rod, 10- baffle, 11- overflow chamber, 12- first guide groove, 13- first overflow hole, 14- water outlet chamber, 15- pressure reduction chamber, 16- second guide groove, 17- second overflow hole, 41- pump shaft, 42- impeller, 43- impeller spacer, 51- guide vane unit, 52- water inlet guide vane, 53- sliding bearing, 61- base, 62- water inlet, 63- filter screen, 421- rear cover plate, 422- blade, 423- front cover plate, 511- guide housing, 512- guide vane cover plate, 513- guide vane, 514- mouth ring. DETAILED DESCRIPTION

[0036] The following will be combined with the attached examples of the present invention Figure 1-Figure 9 A clear and complete description is given to the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0037] The present invention provides a technical solution: a high-efficiency multi-stage sealed centrifugal pump, comprising a bracket 1, a driving motor 2 is fixed to the upper end of the bracket 1, a coupling 3 is fixed to the end of the output shaft of the driving motor 2, a pump shaft mechanism 4 is sleeved and fixed to the lower end of the coupling 3, a guide vane mechanism 5 is arranged on the outer side of the pump shaft mechanism 4, and a water inlet mechanism 6 is arranged at the lower end of the guide vane mechanism 5.

[0038] The bracket 1 is the basic structure of the pump, which carries and supports all other components. It provides a platform for installing and fixing various components to ensure the overall stability and structural integrity of the pump. The drive motor 2 provides the power source required for the operation of the centrifugal pump, and converts electrical energy into mechanical energy through the output shaft. The coupling 3 connects the output shaft of the drive motor 2 and the pump shaft mechanism 4 to transmit the rotational power of the motor. While transmitting power, the coupling can compensate for the axial and radial offsets caused by installation errors or operation, and protect the motor and pump shaft from excessive stress. The pump shaft mechanism 4 is the core transmission component of the pump, which further transmits the power transmitted by the coupling to the impeller, causing it to rotate at high speed, thereby realizing centrifugal transportation of the liquid. The guide vane mechanism 5 is arranged on the outside of the pump shaft to guide and control the flow direction of the liquid and reduce eddy currents and energy losses in the liquid flow. The guide vane mechanism can improve the efficiency and performance stability of the pump, so that the liquid maintains a good flow state during the step-by-step increase in the multi-stage centrifugal pump. The water inlet mechanism 6 The water inlet mechanism is arranged at the lower end of the guide vane mechanism, which is responsible for the liquid entering the pump body from the outside.

[0039] An overflow chamber 11 is provided inside the bracket 1. The overflow chamber 11 is a circular cavity with a notch as a whole. A first guide groove 12 is provided at the bottom. A first overflow hole 13 is provided on the outside of the first guide groove 12. The overflow chamber 11 is a circular cavity with a notch as a whole. The shape of the notch can increase the capacity and liquid storage capacity of the overflow chamber 11. A first guide groove 12 is provided at the bottom of the overflow chamber 11. The first guide groove 12 is designed to guide the flow of liquid to ensure that the liquid in the overflow chamber can be discharged smoothly. A first overflow hole 13 is provided on the outside of the first guide groove 12. The overflow hole is used for discharge when there is too much liquid to prevent liquid from accumulating in the pump body. A water outlet chamber is provided on the left side of the bracket 1. The water outlet chamber is the outlet flow channel of the entire centrifugal pump.

[0040] The overflow chamber is a circular cavity with a notch, which is used to collect the liquid leaked from the pump due to incomplete sealing. The design of this overflow chamber has the following functions:

[0041] 1. Reduce internal pressure fluctuations: The circular cavity with a concave shape: This shape design is not only conducive to collecting and draining leaked liquid, but also can buffer the pressure fluctuations in the pump to a certain extent. The circular structure can evenly distribute the pressure, thereby reducing the risk of damage to the sealing structure caused by pressure concentration. The concave part can act as a buffer, absorb some pressure fluctuations, and ensure the relative stability of the pressure in the pump.

[0042] 2. Improve the operational stability and reliability of the pump: Specifically, reduce local stress concentration: The circular design of the overflow chamber can reduce the problem of local stress concentration. Compared with other shaped cavities, the circular structure can evenly distribute pressure when subjected to force, reduce the risk of structural damage caused by excessive local stress, and enhance the overall stability and reliability of the pump. And prevent liquid erosion and damage: By effectively collecting and discharging leaked liquid, the overflow chamber design can prevent liquid from staying in the pump for a long time, causing corrosion and damage to the pump body and internal components, and extending the service life of the pump.

[0043] The upper end of the bracket 1 is provided with a decompression chamber 15, which reduces the pressure of the liquid in the pump by buffering. The bottom of the decompression chamber 15 is provided with a second guide groove 16, which is similar to the first guide groove and is used to guide the flow of liquid to ensure that the liquid in the decompression chamber can be discharged smoothly. The side of the second guide groove 16 is provided with a second overflow hole 17, which is used to discharge when there is too much liquid in the decompression chamber.

[0044] The overall design of the decompression chamber 15 has the following functions: 1. Reduce liquid pressure: The decompression chamber prevents the impact of excessive liquid pressure on the pump shaft and other seals by buffering and diverting the pressure in the liquid flow. 2. Protect seals and internal components: Through the decompression effect, the service life of mechanical seals, oil seals and other internal components is extended, and the wear and failure caused by high pressure is reduced. 3. Maintain system stability: The decompression chamber 15 and the overflow chamber 11 work together to effectively manage the flow and pressure fluctuations of the liquid in the pump to ensure the stable operation of the system.

[0045] The pump shaft mechanism 4 includes a pump shaft 41, and a plurality of impellers 42 are arranged in an outer edge array of the pump shaft 41, and an impeller spacer 43 is arranged between each group of impellers 42. The pump shaft 41 is a long shaft, usually made of high-strength material, and can withstand high speed and large torque. A plurality of impellers 42 are arranged in an outer edge array of the pump shaft. The pump shaft 41 is connected to the drive motor 2 through the coupling 3, and the rotational power of the motor is transmitted to the impeller, so that the impeller rotates at high speed. When the impeller 42 rotates, the liquid is pushed from the water inlet 62 to the water outlet chamber 14 by centrifugal force, increasing the kinetic energy and pressure of the liquid. Multiple groups of impellers 42 are arranged in series, so that the liquid is pressurized step by step in each stage of the impeller, and high-lift liquid transportation is achieved. The impeller spacer 43 is an annular set installed on the pump shaft 41, located between each group of impellers 42. The spacer material has wear resistance and corrosion resistance, ensuring the reliability of long-term operation. The impeller spacer 43 is used to fix and space each set of impellers 42, ensuring that the impellers are arranged on the pump shaft according to the designed spacing to prevent interference between the impellers. The spacer can help balance the force on the impeller 42, reduce vibration, and stabilize the operation of the pump.

[0046] The impeller 42 includes a rear cover plate 421, a plurality of arc-shaped blades 422 are fixed to the upper end of the rear cover plate 421, and a front cover plate 423 is fixed to the upper end of the blades 422. The main function of the rear cover plate 421 is to provide support and fixation for the blades and guide the fluid to the blades. The rear cover plate is made of a strong material to ensure that the impeller can maintain structural stability when rotating at high speed. The blades 422 are in direct contact with the fluid and are responsible for converting kinetic energy into pressure energy. The arc-shaped design of the blades 422 allows the fluid to pass smoothly and generates centrifugal force when the impeller rotates, thereby increasing the pressure and speed of the fluid. The front cover plate 423 is located at the front of the impeller and covers the top of the blades. Its function is to fix the blades and guide the fluid to leave the impeller and flow to the outlet of the pump. The plurality of blades 422 diverge from the center to the surroundings, and the whole is spiral. The blades diverge from the center to the outside and are arranged in a spiral shape. This design can effectively increase the rotational kinetic energy and flow rate of the fluid. When the fluid passes through the impeller, the spiral arrangement of the blades can generate stronger centrifugal force, thereby improving the pressure and speed conversion efficiency of the fluid. The spiral blade design helps to reduce the turbulence and eddy current of the fluid inside the impeller, which can reduce energy loss and consumption of fluid kinetic energy and improve the overall efficiency of the pump. The spiral arrangement of the blades allows the fluid to flow more stably when passing through the impeller and is effectively guided to the pump outlet. This design not only improves the performance of the pump, but also enhances the operational stability and fluid guiding performance of the pump.

[0047] The guide vane mechanism 5 includes a plurality of guide vane units 51 which are installed step by step at the lower end of the bracket 1, and a water inlet guide vane 52 is fixed at the lower end of the guide vane unit 51. The guide vane units 51 are installed at the lower end of the bracket 1 and arranged step by step so that the fluid can be gradually guided and controlled under different pressure and speed conditions. The step-by-step installation design enables the guide vane mechanism to adapt to the flow of fluids at different levels and improve the control and guiding effect of the fluid. The water inlet guide vane 52 is fixed at the lower end of the guide vane unit 51 and is mainly used to guide the fluid entering the pump body. It optimizes the entry angle and path of the fluid, reduces the turbulence and energy loss of the fluid, and enables the fluid to enter the pump body more smoothly. The water inlet guide vane 52 optimizes the path and angle of the fluid entering the pump body and improves the efficiency of the fluid entering the pump body. Its design reduces the turbulence and energy loss of the fluid and ensures the stability and fluidity of the fluid when entering the pump body.

[0048] The guide vane unit 51 comprises a guide housing 511 and a guide vane cover plate 512. A plurality of guide vanes 513 are fixed between the guide housing 511 and the guide vane cover plate 512. A mouth ring 514 is fixed to the lower end of the guide housing 511. A sliding bearing 53 is embedded between every five guide vane units 51.

[0049] The guide housing 511 is the outer shell of the guide vane unit 51, providing structural support, providing a stable installation foundation for the guide vanes 513 and the guide vane cover plate 512, and ensuring the stable flow of the fluid in the channel. The guide vane cover plate 512 cooperates with the guide housing 511 to fix multiple guide vanes 513. It closes the top of the guide housing so that the fluid flows along a predetermined path in the guide vane unit. The guide vanes 513 are fixed between the guide housing and the guide vane cover plate and are responsible for guiding the direction of the fluid. They optimize the energy transfer and efficiency of the fluid by changing the flow direction and speed of the fluid. The mouth ring 514 is fixed at the lower end of the guide housing 511 to seal and guide the fluid. It ensures that the fluid maintains a stable flow state when entering the next-level guide vane unit.

[0050] Through these designs, the fluid can flow stably in the guide vane unit and the flow path is effectively controlled. The precise design and arrangement of the guide vanes ensure the energy transfer efficiency of the fluid, reduce turbulence and energy loss, and improve the working efficiency of the pump. The design of the mouth ring allows the fluid to maintain a stable and efficient flow state when entering the next-level guide vane unit, further optimizing the overall performance of the pump and significantly improving the fluid control, energy transfer and overall performance of the pump.

[0051] A mechanical seal 7 is fixed to the outer edge of the pump shaft 41, and the mechanical seal 7 is clamped between the bracket 1 and the impeller 42. The main function of the mechanical seal is to prevent fluid leakage at the outer edge of the pump shaft 41. It effectively prevents fluid leakage to the outside by forming a sealing interface between the pump shaft and the pump body (the bracket 1 and the impeller 42). The mechanical seal provides excellent leak-proof performance and can maintain a stable sealing effect under high pressure and high temperature conditions.

[0052] An oil seal 8 is provided at the contact point between the bottom of the decompression chamber 15 and the pump shaft 41. The oil seal forms a reliable sealing interface between the decompression chamber and the pump shaft to prevent fluid leakage and improve the sealing performance of the pump.

[0053] A plurality of tie rods 9 are fixed between the bracket 1 and the water inlet mechanism 6, and a baffle 10 is fixed on the outside of the bracket 1. The tie rods firmly connect the bracket 1 and the water inlet mechanism 6 to provide additional structural support and stability. Through the distribution of the tie rods 9, the force on the pump during operation can be evenly distributed, reducing local stress concentration. The baffle 10 is fixed on the outside of the bracket 1 to prevent external pollutants (such as dust, sand, etc.) from entering the pump body and keep the inside of the pump clean.

[0054] The water inlet mechanism 6 includes a base 61, and a plurality of water inlets 62 are arranged at the bottom and outer edge of the base 61, and a filter screen 63 is arranged on the outer side of the water inlet 62. The base 61, as the foundation of the water inlet mechanism, provides a stable support to ensure the stability of the entire water inlet system. The base 61 fixes a plurality of water inlets 62 and a filter screen 63 to ensure that the positions and functions of these components are not affected. The design of the plurality of water inlets 62 allows the fluid to enter the pump body evenly from different positions, avoiding the problem of uneven flow that may be caused by a single water inlet. The arrangement of the water inlet 62 ensures that the fluid can be evenly distributed before entering the pump body, reduces fluid impact and turbulence, and improves the running stability of the pump. The design of the water inlet 62 can guide the fluid to enter the pump body along the best path, reducing resistance and energy loss. The filter screen 63 can effectively filter out impurities, particles and other contaminants in the fluid to prevent them from entering the pump body. Protect the pump body: By filtering impurities, the internal components of the pump are protected, wear and blockage are reduced, and the service life of the pump is increased.

[0055] The working principle of the present invention can be specifically divided into the following stages:

[0056] 1. Preparation stage: fix the drive motor 2 on the bracket 1, connect the pump shaft 41 through the coupling 3, install a set of impellers 42 on the pump shaft 41, and then install the guide vane unit 51 at the lower end of the bracket 1. The front cover plate 423 on the impeller 42 is clamped in the gap between the guide shell 511 and the mouth ring 514 on the guide vane unit 51. The impeller 42 and the guide vane unit 51 are installed step by step. The guide vane unit 51 is fixed and the impeller 42 can rotate with the pump shaft 41. The water inlet guide vane 52 is installed at the lower end of the last-stage guide vane unit 51, and the water inlet mechanism 6 is fixed at the lower end of the water inlet guide vane 52. By arranging a pull rod between the water inlet mechanism 6 and the bracket 1, the overall strength is enhanced.

[0057] 2. Water inlet stage: start the drive motor 2 to drive the pump shaft mechanism 4 to rotate. The impeller on the pump shaft mechanism 4 rotates to generate centrifugal force. The liquid passes through the multiple water inlets 62 of the pump body and through the filter screen 63 on the outside of the water inlet to prevent impurities from entering the pump body.

[0058] 3. Pressurization stage: The liquid is pressurized step by step from bottom to top through the rotation of the impeller 42 and the guidance of the guide vane unit 51 step by step.

[0059] 4. Water outlet stage: After being pressurized, the liquid is output through the water outlet cavity 14 on the bracket 1.

[0060] 5. Anti-leakage design: Through the design of the double sealing structure, that is, the combination of the mechanical seal 7 and the oil seal 8, multiple safeguards are provided, which significantly improves the sealing performance of the pump and reduces the risk of liquid leakage. As well as the setting of the overflow chamber 11 and the decompression chamber 15 on the bracket 1, the pressure inside the pump can be effectively managed. Through the reasonable design of the guide groove and the overflow hole, the excess pressure and leaked liquid can be discharged in time to ensure the stability of the pressure inside the pump and avoid operating failures caused by pressure fluctuations.

[0061] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-efficiency multi-stage sealed centrifugal pump, characterized in that: It comprises a bracket (1), a driving motor (2) is fixed to the upper end of the bracket (1), a coupling (3) is fixed to the end of the output shaft of the driving motor (2), a pump shaft mechanism (4) is sleeved and fixed to the lower end of the coupling (3), a guide vane mechanism (5) is arranged on the outer side of the pump shaft mechanism (4), and a water inlet mechanism (6) is arranged at the lower end of the guide vane mechanism (5); An overflow chamber (11) is arranged inside the bracket (1), the overflow chamber (11) is a circular chamber with a notch as a whole, a first guide groove (12) is arranged at the bottom, a first overflow hole (13) is arranged outside the first guide groove (12), a water outlet chamber (14) is arranged on the left side of the bracket (1), a decompression chamber (15) is arranged at the upper end of the bracket (1), a second guide groove (16) is arranged at the bottom of the decompression chamber (15), and a second overflow hole (17) is arranged on the side of the second guide groove (16); The first guide groove (12) and the second guide groove (16) are tapered grooves that deepen from the axis toward the outside; An oil seal (8) is provided at the contact point between the bottom of the decompression chamber (15) and the pump shaft (41).

2. A high-efficiency multi-stage sealed centrifugal pump according to claim 1, characterized in that: The pump shaft mechanism (4) comprises a pump shaft (41), and a plurality of groups of impellers (42) are arranged in an array on the outer edge of the pump shaft (41), and an impeller spacer (43) is arranged between each group of impellers (42).

3. A high-efficiency multi-stage sealed centrifugal pump according to claim 2, characterized in that: The impeller (42) comprises a rear cover plate (421), a plurality of arc-shaped blades (422) are fixed to the upper end of the rear cover plate (421), a front cover plate (423) is fixed to the upper end of the blades (422), and the blades (422) radiate from the center to the surroundings and are spiral-shaped as a whole.

4. A high-efficiency multi-stage sealed centrifugal pump according to claim 1, characterized in that: The guide vane mechanism (5) comprises a plurality of guide vane units (51) mounted step by step on the lower end of the bracket (1); a water inlet guide vane (52) is fixed to the lower end of the guide vane unit (51); and a sliding bearing (53) is embedded between every five guide vane units (51).

5. A high-efficiency multi-stage sealed centrifugal pump according to claim 4, characterized in that: The guide vane unit (51) comprises a guide housing (511) and a guide vane cover plate (512), a plurality of guide vanes (513) are fixed between the guide housing (511) and the guide vane cover plate (512), and a mouth ring (514) is fixed at the lower end of the guide housing (511).

6. A high-efficiency multi-stage sealed centrifugal pump according to claim 2, characterized in that: A mechanical seal (7) is fixed to the outer edge of the pump shaft (41), and the mechanical seal (7) is clamped between the bracket (1) and the impeller (42).

7. A high-efficiency multi-stage sealed centrifugal pump according to claim 1, characterized in that: A plurality of pull rods (9) are fixed between the bracket (1) and the water inlet mechanism (6), and a baffle (10) is fixed on the outside of the bracket (1).

8. A high-efficiency multi-stage sealed centrifugal pump according to claim 1, characterized in that: The water inlet mechanism (6) comprises a base (61), a plurality of water inlets (62) are arranged at the bottom and outer edge of the base (61), and a filter screen (63) is arranged outside the water inlet (62).

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