Energy-saving balancing device of multistage centrifugal water pump

Abstract

The invention provides an energy-saving balancing device for a multistage centrifugal water pump, which belongs to the technical field of axial force balance of centrifugal pumps and comprises a sealing seat, a control unit and a balancing unit. A balance cavity is formed in the sealing seat, and a plurality of control cavities are formed in the inner wall of the balance cavity; the control unit comprises execution seats slidably arranged in the control cavities in a one-to-one correspondence mode, adjusting assemblies connected to the control cavities and limiting assemblies arranged on the execution seats, the execution seats divide the control cavities into first control chambers and second control chambers, and the adjusting assemblies are used for controlling the pressure difference between the first control chambers and the second control chambers. The limiting assembly comprises two limiting plates which are oppositely arranged; the balance unit comprises a balance disc arranged in the balance cavity, a balance pipe communicating with the balance cavity and the inlet end of the centrifugal pump and a monitoring piece arranged on the balance disc, the balance disc is provided with a protrusion inserted between the two limiting plates, and the monitoring piece is used for measuring the gap between the balance disc and the inner wall of the balance cavity. The balance disc has the adjusting capacity in the start-stop stage of the centrifugal pump.

Description

Technical Field

[0001] This invention belongs to the technical field of axial force balancing of centrifugal pumps, and specifically relates to an energy-saving balancing device for multi-stage centrifugal water pumps. Background Technology

[0003] Multistage centrifugal pumps are widely used in industrial water supply, mine drainage, and high-pressure boiler feedwater due to their high head characteristics. As the number of stages increases, the fluid pressure difference between the front and rear cover plates of the impeller increases significantly, generating a huge axial thrust. If this axial force is not effectively balanced, it will cause axial movement of the rotor components, aggravate bearing wear, mechanical seal failure, and even cause equipment vibration and shutdown accidents, seriously affecting the pump's operating efficiency and lifespan.

[0004] Currently, axial force balancing is mainly achieved using a balance disc, balance drum, or a combination of both, with the balance disc achieving force balance through dynamic clearance adjustment. However, during the centrifugal pump startup phase, as the pump accelerates from rest to rated speed, the pressure build-up in the rear chamber of the balance disc lags behind the rotor's axial displacement; simultaneously, during the centrifugal pump shutdown phase, the hydrodynamic support force fails before the mechanical system fails. Therefore, it can be concluded that during the centrifugal pump startup and shutdown phases, the clearance value fluctuates violently, indicating a potential loss of balance disc adjustment capability. Summary of the Invention

[0005] This invention provides an energy-saving balancing device for a multi-stage centrifugal water pump, which aims to solve the technical problem of loss of balancing disc adjustment capability during the start-up and shutdown phases of a centrifugal pump.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is: to provide an energy-saving balancing device for a multi-stage centrifugal water pump, comprising: The sealing seat has a balancing cavity, and the inner wall of the balancing cavity has multiple control cavities around the central axis of the sealing seat. The axial direction of the balancing cavity is parallel to the central axis of the sealing seat. The control unit includes an actuator seat slidably disposed in the control cavity, an adjustment assembly connected to the control cavity, and a limiting assembly disposed on the actuator seat. The actuator seat divides the control cavity into a first control chamber and a second control chamber. The adjustment assembly controls the pressure difference between the first control chamber and the second control chamber. The limiting assembly includes two limiting plates disposed opposite to each other along a first direction. The balancing unit includes a balancing disc disposed within the balancing chamber, a balancing pipe connecting the balancing chamber and the inlet of a centrifugal pump, and a monitoring element disposed on the balancing disc. The balancing disc has a protrusion inserted between the two limiting plates. The monitoring element is used to measure the gap between the balancing disc and the inner wall of the balancing chamber. The monitoring element is communicatively connected to the adjustment assembly.

[0007] In one possible implementation, the regulating component includes: The storage tank is connected to both the first control room and the second control room; A first control element, disposed between the storage tank and the first control chamber, is used to regulate the pressure inside the first control chamber; the first control element is communicatively connected to the monitoring element; and A second control element is located between the storage tank and the second control chamber, and is used to regulate the pressure inside the second control chamber. The second control element is communicatively connected to the monitoring element.

[0008] In one possible implementation, a first partition is slidably disposed inside the first control room. The first partition moves along a first direction and divides the first control room into a first main control area and a first auxiliary area. The first auxiliary area is connected to the storage tank. The second control room is slidably provided with a second partition, which moves along a first direction and divides the second control room into a second main control area and a second auxiliary area. The second auxiliary area is connected to the storage tank. The regulating assembly further includes a control tank connecting the first main control area and the second main control area, a level gauge disposed in the control tank, a first distribution component disposed between the first main control area and the control tank, and a second distribution component disposed between the second main control area and the control tank. The control tank is also connected to the balance pipe. The first distribution component, the second distribution component, and the level gauge are all communicatively connected to the monitoring component.

[0009] In one possible implementation, the actuator has a first receiving cavity corresponding to each of the limiting plates. The limiting plates are disposed in the first receiving cavities and are slidably connected to the actuator. The moving direction of the limiting plates is perpendicular to the moving direction of the actuator. The limiting assembly further includes a pneumatic component connected to the limiting plate, the pneumatic component being used to push the limiting plate out of the first receiving cavity.

[0010] In one possible implementation, the actuator has a second storage cavity, which is located between the two first storage cavities; The limiting component also includes: The suction cup is connected to the pneumatic component; A telescopic component is disposed within the second receiving cavity. The telescopic direction of the component is perpendicular to the moving direction of the actuator. The fixed end of the telescopic component is fixedly connected to the actuator, and the telescopic end of the component is fixedly connected to the suction cup. A positioning structure is connected to the limiting plate. After the limiting plate is pushed out of the receiving cavity, the positioning structure fixes the limiting plate to the actuator.

[0011] In one possible implementation, a third storage cavity is formed on the inner wall of the first storage cavity, the positioning structure is disposed in the third storage cavity, and the limiting plate is provided with a positioning groove. The positioning structure also includes: A positioning block, disposed within the third receiving cavity, is slidably connected to the actuator. The moving direction of the positioning block is parallel to the moving direction of the actuator. A force-bearing surface is provided at one end of the positioning block near the limiting plate, the force-bearing surface being located on the side of the positioning block facing the second receiving cavity. The positioning block is also compatible with the positioning groove. An elastic element is fixed between the actuator and the positioning block, and the elastic element has a preload force that causes the positioning block to move outward from the third receiving cavity.

[0012] In one possible implementation, the balancing unit further includes: Two protective covers are disposed opposite each other on both sides of the protrusion along a first direction, each protective cover having a placement groove adapted to the protrusion; and Multiple connecting components are spaced apart around the central axis of the balance disk, and the connecting components are connected to the protective cover to fix the protective cover to the balance disk.

[0013] In one possible implementation, the connection component includes: Two guide posts are fixedly connected to the protective cover in a one-to-one correspondence; A drive sleeve is provided on the outer periphery of the two guide posts. The inner wall of the drive sleeve is provided with two sections of threads with opposite directions. The drive sleeve is screwed to the two guide posts respectively through the two sections of threads. A power component, connected to the drive sleeve, is used to drive the drive sleeve to rotate along a first direction as a rotation axis; and A centering structure, connected to the power component, is used to keep the power component and the drive sleeve relatively stationary in a first direction.

[0014] In one possible implementation, the centering structure includes: The center seat is fixedly connected to the power component; The linkage plate is fixedly connected to the centering seat and rotatably connected to the drive sleeve; and Two deformation members are disposed opposite each other on both sides of the centering seat along a first direction. The deformation members are fixed between the protective cover and the centering seat. The deformation members have a preload force that causes the two protective covers to move away from each other.

[0015] In one possible implementation, a fourth storage cavity is provided on each of the two protective covers on opposite sides; The balancing unit also includes sealing rings spaced apart on the outer periphery of the protrusion. The two sides of the sealing rings are respectively embedded in the two fourth storage cavities. The sealing rings are slidably connected to the protective cover and move along the first direction.

[0016] This invention provides an energy-saving balancing device for a multi-stage centrifugal water pump. Compared with existing technologies, when the centrifugal pump starts, the rotor axial displacement occurs earlier than the pressure in the balancing chamber. At this time, the monitoring device captures the change in the gap between the balancing disc and the balancing chamber in real time and transmits the signal to the adjustment component. The adjustment component responds immediately, driving the actuator to move axially by controlling the pressure difference between the first and second control chambers on both sides of the actuator, thereby adjusting the position of the limit plate and quickly resetting the balancing disc. The reverse is also true when the pump stops, actively compensating for displacement before the fluid support force disappears, eliminating the risk of axial movement. During the stable operation phase of the centrifugal pump, the adjustment component can also participate in gap adjustment to ensure the relative stability of the rotor position. In the start-up and shutdown phases of the centrifugal pump, this invention actively adjusts the position of the balancing disc to avoid gap oscillation caused by the lag of the balancing force, thus enabling the balancing disc to have adjustment capabilities during the start-up and shutdown phases of the centrifugal pump. Attached Figure Description

[0017] Figure 1 This is a cross-sectional view of the energy-saving balancing device for a multi-stage centrifugal water pump according to an embodiment of the present invention; Figure 2 This is a structural schematic diagram illustrating the position of the limiting plate relative to the balance disc in an embodiment of the present invention; Figure 3 This is a partial cross-sectional view illustrating the installation method of the balance disc in an embodiment of the present invention; Figure 4 This is a partial cross-sectional view of the protective cover and balance disc clamping method according to an embodiment of the present invention.

[0018] Explanation of reference numerals in the attached figures: 10. Sealing seat; 101. Balancing chamber; 102. Control chamber; 1021. First control room; 1022. Second control room; 1023. First partition; 1024. First main control area; 1025. First auxiliary area; 1026. Second partition; 1027. Second main control area; 1028. Second auxiliary area; 20. Control unit; 201. Actuator; 2011. First storage cavity; 2012. Second storage cavity; 2013. Third storage cavity; 202. Limiting plate; 2021. Positioning groove; 203. Storage tank; 204. First control component; 205. Second control component; 206. Control tank; 207. First distribution component; 208. Second distribution component; 209. Pneumatic component; 210. Suction cup; 211. Telescopic component; 212. Positioning block; 2121. Force-bearing surface; 213. Elastic component; 30. Balancing unit; 301. Balancing disc; 3011. Protrusion; 302. Balancing tube; 303. Protective cover; 3031. Placement slot; 3032. Fourth storage cavity; 304. Guide column; 305. Drive sleeve; 306. Power component; 307. Centering seat; 308. Linkage plate; 309. Deformation component; 310. Sealing ring. Detailed Implementation

[0019] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0020] Please also refer to Figures 1 to 4 This invention describes an energy-saving balancing device for a multi-stage centrifugal water pump. The energy-saving balancing device for a multi-stage centrifugal water pump includes a sealing seat 10, a control unit 20, and a balancing unit 30. The sealing seat 10 has a balancing cavity 101, and the inner wall of the balancing cavity 101 has multiple control cavities 102 formed around the central axis of the sealing seat 10. The axial direction of the balancing cavity 101 is parallel to the central axis of the sealing seat 10. The control unit 20 includes an actuator 201 corresponding to each control cavity 102, an adjustment component connected to the control cavity 102, and a limiting component provided on the actuator 201. The actuator 201 divides the control cavity 102 into a first control chamber 1021 and a second control chamber 1022. The regulating component is used to control the pressure difference between the first control chamber 1021 and the second control chamber 1022. The limiting component includes two limiting plates 202 arranged opposite to each other along a first direction. The balancing unit 30 includes a balancing disc 301 disposed in the balancing chamber 101, a balancing pipe 302 connecting the balancing chamber 101 and the inlet end of the centrifugal pump, and a monitoring element disposed on the balancing disc 301. The balancing disc 301 has a protrusion 3011 inserted between the two limiting plates 202. The monitoring element is used to measure the gap between the balancing disc 301 and the inner wall of the balancing chamber 101. The monitoring element is communicatively connected to the regulating component. The monitoring element can be a gap sensor.

[0021] This embodiment provides an energy-saving balancing device for a multi-stage centrifugal water pump. Compared with existing technologies, when the centrifugal pump starts, the rotor axial displacement occurs before the pressure in the balancing chamber 101 is established. At this time, the monitoring device captures the change in the gap between the balancing disc 301 and the balancing chamber 101 in real time and transmits the signal to the adjustment component. The adjustment component responds immediately by controlling the pressure difference between the first control chamber 1021 and the second control chamber 1022 on both sides of the actuator 201, driving the actuator 201 to move axially, thereby adjusting the position of the protrusion 3011 on the limit plate 202, so that the balancing disc 301 quickly resets. The reverse is also true when the pump stops, actively compensating for displacement before the fluid support force disappears, eliminating the risk of axial movement. During the stable operation phase of the centrifugal pump, the adjustment component can also participate in the gap adjustment operation to ensure the relative stability of the rotor position. In the centrifugal pump start-up and shutdown phases, this invention actively adjusts the position of the balancing disc 301 to avoid gap oscillation caused by the lag of the balancing force, thus enabling the balancing disc 301 to have adjustment capabilities during the centrifugal pump start-up and shutdown phases.

[0022] In some embodiments, see Figure 1 The regulating component includes a storage tank 203, a first control element 204, and a second control element 205. Both the first control element 204 and the second control element 205 can be gear pumps or screw pumps. The storage tank 203 is connected to both the first control chamber 1021 and the second control chamber 1022. The first control element 204 is located between the storage tank 203 and the first control chamber 1021 and is used to regulate the pressure in the first control chamber 1021. The first control element 204 is communicatively connected to the monitoring element. The second control element 205 is located between the storage tank 203 and the second control chamber 1022 and is used to regulate the pressure in the second control chamber 1022. The second control element 205 is communicatively connected to the monitoring element.

[0023] When the centrifugal pump starts and the rotor moves axially, the monitoring device detects an abnormal increase in the gap of the balance disc 301 in real time. Simultaneously, it sends commands to the first control unit 204 and the second control unit 205. The first control unit 204 immediately increases the flow rate from the storage tank 203 to the first control chamber 1021, causing the pressure in the first control chamber 1021 to rise sharply. At the same time, the second control unit 205 reduces the flow rate into the second control chamber 1022 or even actively depressurizes it. This establishes a pressure difference on both sides of the actuator 201, thereby pushing the actuator 201 to move towards the low-pressure side and forcing the balance disc 301 to reset. When the pump stops, the operation is reversed. The pressure difference is adjusted in advance before the fluid support force decays to counteract the rotor's tendency to move back.

[0024] In some embodiments, see Figure 1A first partition 1023 is slidably installed inside the first control room 1021. The first partition 1023 moves along a first direction and divides the first control room 1021 into a first main control area 1024 and a first auxiliary area 1025. The first auxiliary area 1025 is connected to the storage tank 203. A second partition 1026 is slidably installed inside the second control room 1022. The second partition 1026 moves along a first direction and divides the second control room 1022 into a second main control area 1027 and a second auxiliary area 1028. The second auxiliary area 1028 is connected to the storage tank 203.

[0025] The regulating assembly also includes a control tank 206 connecting the first main control area 1024 and the second main control area 1027, a level gauge disposed in the control tank 206, a first distribution component 207 disposed between the first main control area 1024 and the control tank 206, and a second distribution component 208 disposed between the second main control area 1027 and the control tank 206. The control tank 206 is also connected to the balance pipe 302. The first distribution component 207, the second distribution component 208 and the level gauge are all communicatively connected to the monitoring component. The first distribution component 207 and the second distribution component 208 can both be gear pumps or screw pumps.

[0026] When the centrifugal pump starts and the rotor moves axially, the monitoring device detects an abnormal increase in the gap of the balance disc 301 in real time. Simultaneously, it sends commands to the first distribution component 207 and the second distribution component 208. The first distribution component 207 immediately increases the flow rate from the control tank 206 to the first main control area 1024, causing the pressure in the first main control area 1024 to rise sharply. At the same time, the second distribution component 208 reduces the flow rate into the second main control area 1027 or even actively depressurizes it. This establishes a pressure difference on both sides of the actuator 201, thereby pushing the actuator 201 to move towards the low-pressure side and forcing the balance disc 301 to reset. When the pump stops, the operation is reversed. The pressure difference is pre-adjusted before the fluid support force decays to counteract the rotor's tendency to move back.

[0027] During the pressure regulation process on both sides of the actuator 201, the level gauge monitors the liquid level in the control tank 206 in real time. If the liquid level is lower than the preset value, it means that the fluid in the control tank 206 cannot meet the pressure difference on both sides of the actuator 201, that is, the fluid flowing back from the balance pipe 302 to the storage tank 203 is insufficient. At this time, the level gauge transmits the signal to the first control component 204 and the second control component 205. The first control component 204 and the second control component 205 regulate the pressure of the first auxiliary area 1025 and the second auxiliary area 1028 to rebuild the pressure balance on both sides of the actuator 201.

[0028] The fluid required for pressure changes comes from the fluid returning from the balance pipe 302 and the fluid actively intervened in the control tank 206. The flow distribution is automatically adjusted to maximize the use of the return flow power, and then stable operation is ensured by actively intervening in the fluid.

[0029] In some embodiments, see Figure 3 The actuator 201 has a first storage cavity 2011 that corresponds one-to-one with the limiting plate 202. The limiting plate 202 is located in the first storage cavity 2011 and is slidably connected to the actuator 201. The moving direction of the limiting plate 202 is perpendicular to the moving direction of the actuator 201.

[0030] The limiting assembly also includes a pneumatic component 209 connected to the limiting plate 202. The pneumatic component 209 is used to push the limiting plate 202 out of the first receiving cavity 2011. The pneumatic component 209 is an air pump.

[0031] During assembly, the protrusion 3011 of the balance disc 301 is first placed between the two retracted limiting plates 202. Then, the pneumatic component 209 is activated to inject compressed air into the first receiving cavity 2011, pushing the limiting plates 202 out along the direction perpendicular to the movement of the actuator 201, so that the two limiting plates 202 simultaneously abut against the two sides of the protrusion 3011. At this time, the balance disc 301, the limiting plates 202 and the actuator 201 are a whole moving unit. When the actuator 201 moves, the thrust is transmitted to the protrusion 3011 through the limiting plates 202, forcing the balance disc 301 to dynamically reset.

[0032] In some embodiments, see Figure 3 The actuator 201 has a second storage cavity 2012, which is located between the two first storage cavities 2011.

[0033] The limiting assembly also includes a suction cup 210, a telescopic member 211, and a positioning structure; the suction cup 210 is connected to the pneumatic component 209; the telescopic member 211 is located in the second receiving cavity 2012, the telescopic direction of the telescopic member 211 is perpendicular to the moving direction of the actuator 201, the fixed end of the telescopic member 211 is fixedly connected to the actuator 201, and the telescopic end of the telescopic member 211 is fixedly connected to the suction cup 210; the telescopic member 211 is a telescopic oil cylinder or hydraulic cylinder; the positioning structure is connected to the limiting plate 202, and after the limiting plate 202 is pushed out of the receiving cavity, the positioning structure fixes the limiting plate 202 to the actuator 201.

[0034] A third storage cavity 2013 is formed on the inner wall of the first storage cavity 2011. A positioning structure is disposed in the third storage cavity 2013, and a positioning groove 2021 is formed in the limiting plate 202. The positioning structure also includes a positioning block 212 and a spring element 213. The positioning block 212 is disposed in the third storage cavity 2013 and is slidably connected to the actuator 201. The moving direction of the positioning block 212 is parallel to the moving direction of the actuator 201. 2. A force-bearing surface 2121 is provided at one end near the limiting plate 202. The force-bearing surface 2121 is located on the side of the positioning block 212 facing the second receiving cavity 2012. The positioning block 212 is also inserted and adapted to the positioning groove 2021. The elastic member 213 is fixed between the actuator 201 and the positioning block 212. The elastic member 213 has a pre-tightening force that causes the positioning block 212 to move outward of the third receiving cavity 2013. The elastic member 213 is a spring or a spring rod.

[0035] The suction cup 210 is initially extended from the second receiving cavity 2012. After aligning the balance plate 301 with the suction cup 210, the pneumatic component 209 is activated to make the balance plate 301 adhere and fix to the actuator 201, reducing the installation difficulty of the balance plate 301. At the same time, the pneumatic component 209 compresses the extracted gas and sends it into the first receiving cavity 2011, causing the limiting plate 202 to be pushed out.

[0036] During the process of the limiting plate 202 being pushed out, the limiting plate 202 first squeezes the force-bearing surface 2121 of the positioning block 212, so that the positioning block 212 is drawn into the third receiving cavity 2013. Until the limiting plate 202 is completely pushed out, the positioning block 212 is aligned with the positioning groove 2021. At this time, the elastic member 213 releases its elastic force to insert the positioning block 212 into the positioning groove 2021, thereby fixing the position of the limiting plate 202.

[0037] After the position of the limiting plate 202 is fixed, the pneumatic component 209 extracts the gas in the first storage cavity 2011 and sends it into the suction cup 210, so that the suction cup 210 is separated from the balance plate 301. Then the telescopic component 211 is activated to retract the suction cup 210 into the second storage cavity 2012. After the suction cup 210 completes the temporary fixing task, it can be retracted into the second storage cavity 2012 without interfering with the rotation of the balance plate 301.

[0038] In some embodiments, see Figure 4 The balancing unit 30 also includes two protective covers 303 and multiple connecting components; the two protective covers 303 are disposed opposite to each other on both sides of the protrusion 3011 along a first direction, and the protective covers 303 have placement grooves 3031 adapted to the protrusion 3011; the multiple connecting components are spaced apart around the central axis of the balancing disc 301, and the connecting components are connected to the protective covers 303 for fixing the protective covers 303 to the protrusion 3011.

[0039] The connecting assembly includes two guide posts 304, a drive sleeve 305, a power component 306, and a centering structure. The two guide posts 304 are fixedly connected to the protective cover 303 in a one-to-one correspondence. The drive sleeve 305 is located on the outer periphery of the two guide posts 304, and the inner wall of the drive sleeve 305 has two sections of threads with opposite directions. The drive sleeve 305 is screwed to the two guide posts 304 through the two sections of threads. The power component 306 is connected to the drive sleeve 305 for driving the drive sleeve 305 to rotate along the first direction as the rotation axis. The power component 306 can be a servo motor, and the power component 306 and the drive sleeve 305 are connected by a bevel gear set for transmission. The centering structure is connected to the power component 306 for keeping the power component 306 and the drive sleeve 305 relatively stationary in the first direction.

[0040] The centering structure includes a centering seat 307, a linkage plate 308, and two deformation members 309. The centering seat 307 is fixedly connected to the power member 306. The linkage plate 308 is fixedly connected to the centering seat 307 and is also rotatably connected to the drive sleeve 305. The two deformation members 309 are arranged opposite to each other on both sides of the centering seat 307 along a first direction. The deformation members 309 are fixedly connected between the protective cover 303 and the centering seat 307. The deformation members 309 have a pre-tightening force that causes the two protective covers 303 to move away from each other.

[0041] During assembly, the balance disc 301 is embedded in the placement slots 3031 of the two protective covers 303. The starting power component 306 drives the drive sleeve 305 to rotate. The guide columns 304 on both sides are pulled to move towards each other through the threaded sections with opposite directions, so that the protective cover 303 covers the protrusion 3011 and the balance disc 301 with a constant clamping force, forming a full circumferential constraint.

[0042] During the rotation of the drive sleeve 305, the linkage plate 308 keeps the drive sleeve 305 and the power component 306 in a relatively fixed position. When the two protective sleeves move away from each other, the deformation component 309 will release elastic force to assist the two protective sleeves to move away from each other. When the two protective sleeves move closer to each other, the deformation component 309 is squeezed and accumulates elastic force.

[0043] In some embodiments, see Figure 4 Each of the two protective covers 303 has a fourth storage cavity 3032 on one side opposite to the other; the balance unit 30 also includes a sealing ring 310 spaced apart on the outer periphery of the protrusion 3011. The two sides of the sealing ring 310 are respectively embedded in the two fourth storage cavities 3032. The sealing ring 310 is slidably connected to the protective cover 303 and moves along the first direction.

[0044] As the two protective covers 303 move away from or towards each other, the sealing ring 310 can move within the fourth receiving cavity 3032 to adapt to the distance between the two protective covers 303; at the same time, the sealing ring 310 and the outer periphery of the balance disc 301 form an independent area, placing the power source that drives the movement of the protective covers 303 within the independent area to avoid damage to the power source by external fluids.

[0045] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An energy-saving balancing device for a multi-stage centrifugal water pump, characterized in that, include: The sealing seat has a balancing cavity, and the inner wall of the balancing cavity has multiple control cavities around the central axis of the sealing seat. The axial direction of the balancing cavity is parallel to the central axis of the sealing seat. The control unit includes an actuator seat that is slidably disposed in the control cavity, an adjustment component connected to the control cavity, and a limiting component disposed on the actuator seat. The actuator seat divides the control cavity into a first control chamber and a second control chamber. The adjustment component is used to control the pressure difference between the first control chamber and the second control chamber. The limiting component includes two limiting plates disposed opposite to each other along a first direction. as well as The balancing unit includes a balancing disc disposed within the balancing chamber, a balancing pipe connecting the balancing chamber and the inlet of a centrifugal pump, and a monitoring element disposed on the balancing disc. The balancing disc has a protrusion inserted between the two limiting plates. The monitoring element is used to measure the gap between the balancing disc and the inner wall of the balancing chamber. The monitoring element is communicatively connected to the adjustment assembly.

2. The energy-saving balancing device for multi-stage centrifugal water pumps as described in claim 1, characterized in that, The adjustment component includes: The storage tank is connected to both the first control room and the second control room; A first control element, disposed between the storage tank and the first control chamber, is used to regulate the pressure inside the first control chamber; the first control element is communicatively connected to the monitoring element; and A second control element is located between the storage tank and the second control chamber, and is used to regulate the pressure inside the second control chamber. The second control element is communicatively connected to the monitoring element.

3. The energy-saving balancing device for multi-stage centrifugal water pumps as described in claim 2, characterized in that, The first control room is slidably provided with a first partition, which moves along a first direction and divides the first control room into a first main control area and a first auxiliary area. The first auxiliary area is connected to the storage tank. The second control room is slidably provided with a second partition, which moves along a first direction and divides the second control room into a second main control area and a second auxiliary area. The second auxiliary area is connected to the storage tank. The regulating assembly further includes a control tank connecting the first main control area and the second main control area, a level gauge disposed in the control tank, a first distribution component disposed between the first main control area and the control tank, and a second distribution component disposed between the second main control area and the control tank. The control tank is also connected to the balance pipe. The first distribution component, the second distribution component, and the level gauge are all communicatively connected to the monitoring component.

4. The energy-saving balancing device for multi-stage centrifugal water pumps as described in claim 1, characterized in that, The actuator has a first storage cavity corresponding to each of the limiting plates. The limiting plates are disposed in the first storage cavity and are slidably connected to the actuator. The moving direction of the limiting plates is perpendicular to the moving direction of the actuator. The limiting assembly further includes a pneumatic component connected to the limiting plate, the pneumatic component being used to push the limiting plate out of the first receiving cavity.

5. The energy-saving balancing device for a multi-stage centrifugal water pump as described in claim 4, characterized in that, The actuator has a second storage cavity, which is located between the two first storage cavities; The limiting component also includes: The suction cup is connected to the pneumatic component; A telescopic component is disposed within the second receiving cavity. The telescopic direction of the component is perpendicular to the moving direction of the actuator. The fixed end of the telescopic component is fixedly connected to the actuator, and the telescopic end of the component is fixedly connected to the suction cup. A positioning structure is connected to the limiting plate. After the limiting plate is pushed out of the receiving cavity, the positioning structure fixes the limiting plate to the actuator.

6. The energy-saving balancing device for a multi-stage centrifugal water pump as described in claim 5, characterized in that, The inner wall of the first storage cavity is provided with a third storage cavity, the positioning structure is disposed in the third storage cavity, and the limiting plate is provided with a positioning groove. The positioning structure also includes: A positioning block, disposed within the third receiving cavity, is slidably connected to the actuator seat. The moving direction of the positioning block is parallel to the moving direction of the actuator seat. A force-bearing surface is provided at one end of the positioning block near the limiting plate, and this force-bearing surface is located on the side of the positioning block facing the second receiving cavity. The positioning block is also compatible with the positioning groove. An elastic element is fixed between the actuator and the positioning block, and the elastic element has a preload force that causes the positioning block to move outward from the third receiving cavity.

7. The energy-saving balancing device for a multi-stage centrifugal water pump as described in claim 1, characterized in that, The balancing unit further includes: Two protective covers are disposed opposite each other on both sides of the protrusion along a first direction, each protective cover having a placement groove adapted to the protrusion; and Multiple connecting components are spaced apart around the central axis of the balance disk, and the connecting components are connected to the protective cover to fix the protective cover to the balance disk.

8. The energy-saving balancing device for a multi-stage centrifugal water pump as described in claim 7, characterized in that, The connection component includes: Two guide posts are fixedly connected to the protective cover in a one-to-one correspondence; A drive sleeve is provided on the outer periphery of the two guide posts. The inner wall of the drive sleeve is provided with two sections of threads with opposite directions. The drive sleeve is screwed to the two guide posts respectively through the two sections of threads. A power component, connected to the drive sleeve, is used to drive the drive sleeve to rotate along a first direction as a rotation axis; and A centering structure, connected to the power component, is used to keep the power component and the drive sleeve relatively stationary in a first direction.

9. The energy-saving balancing device for a multi-stage centrifugal water pump as described in claim 8, characterized in that, The centering structure includes: The center seat is fixedly connected to the power component; The linkage plate is fixedly connected to the centering seat and rotatably connected to the drive sleeve; and Two deformation members are disposed opposite each other on both sides of the centering seat along a first direction. The deformation members are fixed between the protective cover and the centering seat. The deformation members have a preload force that causes the two protective covers to move away from each other.

10. The energy-saving balancing device for a multi-stage centrifugal water pump as described in claim 8, characterized in that, A fourth storage cavity is provided on each of the two protective covers on opposite sides; The balancing unit also includes sealing rings spaced apart on the outer periphery of the protrusion. The two sides of the sealing rings are respectively embedded in the two fourth storage cavities. The sealing rings are slidably connected to the protective cover and move along the first direction.

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