Semi-submersible non-sealing vertical centrifugal pump

Abstract

The invention relates to a semi-submersible non-sealing vertical centrifugal pump which comprises supporting legs, a pump body, an impeller, a support, a pump shaft, a motor, a controller, a water level probe, a sealing box, an auxiliary impeller and a motor shaft. The controller is installed on the motor, a pump suction inlet is formed in the supporting legs and located below the pump body, an exhaust port is formed in the upper left portion or the upper right portion of the pump body, a hub of the impeller is installed on the pump shaft, the compressible spring is installed in the hub of the impeller and at the installation position of the pump shaft, the auxiliary impeller is installed above the impeller and fixed to the pump shaft, and the sealing box is located in a pump cavity formed by the pump body and the support. The auxiliary impeller is fixed to the support and located in the sealing box. The water level probe is installed on the support and connected with the controller through a signal line. And the controller is mounted on the motor. The invention has the advantages of simple and convenient use, no need of a water diversion device or installation of a bottom valve, automatic operation, automatic pump starting and automatic pump stopping according to the change of the water level, stable operation, high reliability, no sealing leakage, and no easy burning of the motor, and the pump head part is immersed in the liquid.

Description

Technical Field

[0001] This invention relates to a centrifugal pump, specifically to a semi-submersible, seal-free vertical centrifugal pump that requires no priming device or foot valve, has its pump head partially submerged in liquid, and features stable operation, high reliability, no seal leakage, and a motor that is not easily burned out. Background Technology

[0002] To address drainage issues in trenches and other areas with relatively shallow water levels and no specific sump, traditional submersible sewage pumps, pipeline pumps, or submersible pumps suffer from the following main problems: 1. Submersible pumps are prone to burnout: Traditional sewage pumps have a minimum submersion depth requirement. If the submersion depth is too low, the pump is prone to burnout, and leakage of the mechanical seal can also burn out the motor.

[0003] 2. Dry pipeline pumps are inconvenient to use and the mechanical seal is easily damaged: Traditional dry pipeline pumps or end-suction pumps require the addition of a priming device or the installation of a foot valve, which is inconvenient to use. When the liquid level is low, the pump chamber cannot be filled with water, and the mechanical seal is easily burned out.

[0004] 3. Submersible pumps are inconvenient to use: Submersible pumps are relatively long and require the excavation of deep sump pits, making them inconvenient to use and costly.

[0005] To improve the reliability of submersible pumps, Chinese patent application CN119594025A discloses a seal-free vertical submersible double-suction pump structure for conveying halogen salts and slurries. Specifically, it relates to the field of vertical submersible slurry pump technology, specifically a seal-free vertical submersible double-suction pump structure for conveying halogen salts and slurries. The structure includes a double-suction housing with an upper inlet and a lower inlet. Slurry enters from both ends of the double-suction housing. A double-suction open impeller is installed inside the housing. This seal-free vertical submersible double-suction pump structure for conveying halogen salts and slurries employs a double-suction inlet method. The pressure decreases as liquid is drawn into the housing, preventing liquid from entering the upper bearing components and thus eliminating the need for a sealing device. This avoids the sealing failure problem caused by the need for a seal on the upper part of the housing in traditional single-suction pumps to prevent liquid from entering the bearings, significantly improving the pump's reliability and service life. This type of submersible pump adopts a double-suction structure with a relatively long overall shaft extension. It relies on impeller suction without a sealing principle and is not suitable for drainage in trenches or other places where the water level is not particularly deep and there is no specific sump.

[0006] This invention addresses the aforementioned problems with a semi-submersible, seal-free vertical centrifugal pump, which can be applied to drainage systems in subways and industrial aquaculture. Summary of the Invention

[0007] To address the aforementioned problems, the main objective of this invention is to provide a semi-submersible, seal-free vertical centrifugal pump that requires no priming device or foot valve, has its pump head partially submerged in liquid, and features stable operation, high reliability, no seal leakage, impeller self-adaptation, intelligent operation, and a motor that is less prone to burnout.

[0008] The present invention solves the above-mentioned technical problems through the following technical solution: a semi-submersible seal-less vertical centrifugal pump, comprising: a support foot, a pump body, an impeller, a bracket, a pump shaft, a motor, a controller, a water level probe, a sealing box, an auxiliary impeller, and a motor shaft; the controller is mounted on the motor, the motor is fixed on the bracket, the motor shaft is mounted inside the pump shaft, the bracket is fixed on the pump body, the pump inlet is located on the support foot below the pump body, the outlet is located on the upper left or right side of the pump body, the impeller hub is mounted on the pump shaft, a compressible spring is installed inside the impeller hub at the installation position of the pump shaft, an auxiliary impeller is mounted above the impeller and fixed on the pump shaft, the sealing box is located in the pump cavity formed by the pump body and the bracket and is fixed on the bracket, the auxiliary impeller is located inside the sealing box; the water level probe is mounted on the bracket and is connected to the controller via a signal line; the controller is mounted on the motor.

[0009] In a specific embodiment of the present invention, the motor shaft and the pump shaft are fixed together by screws; the impeller hub and the pump shaft are locked together by an impeller nut.

[0010] In a specific embodiment of the present invention, a sealing O-ring is provided at the connection between the bracket and the pump body.

[0011] In a specific embodiment of the present invention, the auxiliary impeller is fixed to the pump shaft with a round nut; the pump shaft is rigidly connected to the motor shaft, and the two are fixed together by a set screw.

[0012] In a specific embodiment of the present invention, the sealing box is located between the impeller and the auxiliary impeller.

[0013] In a specific embodiment of the present invention, during installation, a portion of the pump's outlet is submerged in liquid.

[0014] In a specific embodiment of the present invention, positioning protrusions and grooves are respectively provided on the contact surfaces between the sealing box and the bracket, and the sealing box is fixed to the bracket with screws.

[0015] In a specific embodiment of the present invention, the water level probe is mounted on a bracket and connected to the controller via a signal line. When the drainage liquid level is higher than the water level probe, a pump start signal is triggered. After receiving the signal, the controller starts the motor to drive the impeller to rotate, thus performing the drainage operation.

[0016] In a specific embodiment of the present invention, the controller can monitor the pump operating current. When the operating current is less than the pump's minimum current, the controller stops the motor to prevent the centrifugal pump from running dry. When the operating current is greater than the motor's rated current, the controller stops the motor.

[0017] In a specific embodiment of the present invention, the impeller adopts an adaptive floating impeller design. A compressible spring is installed in the impeller hub at the pump shaft mounting position. When the conveyed liquid contains a large amount of impurities or fibers with large particles, the upward reaction force is greater than the spring preload, and the impeller can float upward to increase the passage capacity of impurities such as fibers and avoid pump jamming.

[0018] The positive and progressive effects of the present invention are as follows: The semi-submersible sealless vertical centrifugal pump provided by the present invention has the following advantages: The present invention is easy to use, does not require a priming device or a foot valve, the pump head is partially submerged in the liquid, it operates stably, has high reliability, no seal leakage, impeller self-adaptation, automatic pump operation, and the motor is not easily burned out. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0020] Figure 2 This is a partially enlarged view of the present invention.

[0021] The following are the names corresponding to the reference numerals in this invention: 1. Support leg; 2. Impeller; 3. Pump body; 4. Pump shaft; 5. Bracket; 6. Motor; 7. Impeller nut; 8. Spring; 9. Round nut; 10. Sealing box; 11. Secondary impeller; 12. Motor shaft; 13. Water level probe; 14. Controller. Detailed Implementation

[0022] The preferred embodiments of the present invention are given below with reference to the accompanying drawings to illustrate the technical solution of the present invention in detail.

[0023] Figure 1 This is a schematic diagram of the overall structure of the present invention. Figure 2 This is a partial enlarged view of the present invention, such as... Figure 1As shown: This invention provides a semi-submersible sealless vertical centrifugal pump, which includes: a support 1, an impeller 2, a pump body 3, a pump shaft 4, a bracket 5, a motor 6, an impeller nut 7, a spring 8, a round nut 9, a sealing box 10, an auxiliary impeller 11, a motor shaft 12, a water level probe 13, and a controller 14; the motor 6 is fixed on the bracket 5, the motor shaft 12 is installed inside the pump shaft 4, the bracket 5 is fixed on the pump body 1, the pump inlet is below the pump body 1, and the outlet is on the upper left or right side of the pump body 1; the hub of the impeller 2 is installed on the pump shaft 4, and a compressible spring 8 is installed inside the hub of the impeller 2 at the same position as the pump shaft 4; two auxiliary impellers 11 are installed above the impeller 2, and the auxiliary impellers 11 are fixed on the pump shaft 4 and locked with round nuts 9; the sealing box 10 is located in the pump cavity formed by the pump body 1 and the bracket 3, and is fixed on the bracket 3; one of the auxiliary impellers 11 is located inside the sealing box 10. The water level probe 13 is mounted on the bracket 5 and communicates with the controller 14 via a signal line. The controller 14 is mounted on the motor 6.

[0024] In specific implementation, the motor shaft 12 and pump shaft 4 of this invention are fixed together with screws; a sealing O-ring is provided at the connection between the bracket 5 and the pump body 3; the impeller hub 2 and the pump shaft 4 are locked together with an impeller nut 7, and a compressible spring 8 is installed in the impeller hub of the impeller 2 at the installation position of the pump shaft 4; the auxiliary impeller 10 is fixed to the pump shaft 4 with a round nut 8, and the pump shaft 4 is rigidly connected to the motor shaft 12, and the two are fixed together with set screws. Positioning protrusions and grooves are respectively provided on the contact surface between the sealing box 10 and the bracket 5, and the sealing box 10 is fixed to the bracket 5 with screws.

[0025] In this invention, the sealing box 10 is located between the impeller 2 and the auxiliary impeller 11. The sealing box 10 separates the two auxiliary impellers, and the two auxiliary impellers are arranged symmetrically to reduce leakage of the internal cavity. Relying on only one auxiliary impeller 11 results in a relatively large leakage.

[0026] The sealing box 10 of this invention has positioning protrusions and grooves respectively provided on the contact surface between it and the bracket 5. The sealing box 10 is fixed to the bracket 3 with screws. The water level probe is installed on the bracket 5 and communicates with the controller 14 through a signal line. The controller 14 is installed on the motor 6.

[0027] In this invention, the high-speed rotation of the motor shaft 12 drives the impeller 2 to rotate at high speed through the pump shaft 4, which generates pressure and a certain suction force in the liquid, causing the liquid to enter the impeller 2 through the inlet below the pump body 1. After the rotation accelerates, the liquid is discharged through the outlet at the upper left of the pump body 1, while the pump cavity is filled with liquid. At the same time, the pump shaft 4 drives the auxiliary impeller 11 to rotate at high speed, which creates pressure in the sealing box 10, thereby achieving a sealing effect.

[0028] The user can fix the pump head to the foundation through the support foot 1, so that the pump head is submerged in the liquid. When the liquid level exceeds the position of the water level probe 13, the pump start signal is triggered. When the liquid level is low, below the impeller 2, the centrifugal pump can still be used normally. The problem of mechanical seal burning due to lack of water lubrication is solved. When the controller 14 detects that the current is less than the minimum current of the pump, the controller 14 controls the motor 6 to stop automatically, thereby realizing the automatic operation of the pump.

[0029] When the conveying medium contains a lot of impurities such as fibers and particles, they will rub against each other at the gap between the impeller 2 and the support leg 1, generating an upward force F1. When F1 is greater than the preload of the spring 8, the impeller 2 will move upward, increasing the impeller's throughput capacity and protecting the motor from overload.

[0030] In this invention, the centrifugal pump head is submerged in liquid. When the liquid level exceeds the position of the water level probe 13, a pump start signal is triggered. The impeller rotates at high speed driven by the motor, generating suction on the inlet liquid below the pump body 1. The lift (pressure) generated by the work done on the liquid is discharged through the outlet of the pump body 1. This completes the entire process of converting the mechanical energy of the motor into the energy (kinetic energy, pressure energy, potential energy) of the liquid, while simultaneously achieving the purpose of transporting the liquid from low pressure to high pressure, from low position to high position, and over long distances.

[0031] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as defined by the appended claims and their equivalents.

Claims

1. A semi-submersible, seal-less vertical centrifugal pump, characterized in that: The semi-submersible, seal-less vertical centrifugal pump includes: a support foot, a pump body, an impeller, a bracket, a pump shaft, a motor, a controller, a water level probe, a sealing box, an auxiliary impeller, and a motor shaft. The controller is mounted on the motor, the motor is fixed to the bracket, the motor shaft is installed inside the pump shaft, and the bracket is fixed to the pump body. The pump inlet is located on the support foot below the pump body, and the outlet is located on the upper left or right side of the pump body. The impeller hub is mounted on the pump shaft, and a compressible spring is installed inside the impeller hub at the same mounting position as the pump shaft. An auxiliary impeller is mounted above the impeller and fixed to the pump shaft. The sealing box is located inside the pump cavity formed by the pump body and the bracket and is fixed to the bracket. The auxiliary impeller is located inside the sealing box. The water level probe is mounted on the bracket and is connected to the controller via a signal line. The controller is mounted on the motor.

2. The semi-submersible sealless vertical centrifugal pump according to claim 1, characterized in that: The motor shaft and pump shaft are fixed together with screws; the impeller hub and pump shaft are locked together with impeller nuts.

3. The semi-submersible seal-less vertical centrifugal pump according to claim 1, characterized in that: A sealing O-ring is installed at the connection between the bracket and the pump body.

4. The semi-submersible seal-less vertical centrifugal pump according to claim 1, characterized in that: The auxiliary impeller is fixed to the pump shaft with a round nut; the pump shaft is rigidly connected to the motor shaft, and the two are fixed together by a set screw.

5. The semi-submersible seal-less vertical centrifugal pump according to claim 1, characterized in that: The sealing box is located between the impeller and the auxiliary impeller.

6. The semi-submersible seal-less vertical centrifugal pump according to claim 1, characterized in that: During installation, part of the pump's outlet can be submerged in liquid.

7. The semi-submersible seal-less vertical centrifugal pump according to claim 1, characterized in that: Positioning protrusions and grooves are provided on the contact surfaces between the sealing box and the bracket, and the sealing box is fixed to the bracket with screws.

8. The semi-submersible seal-less vertical centrifugal pump according to claim 1, characterized in that: The water level probe is mounted on a bracket and connected to the controller via a signal line. When the drainage level is higher than the water level probe, a pump start signal is triggered. After receiving the signal, the controller starts the motor to drive the impeller to rotate and perform drainage.

9. The semi-submersible sealless vertical centrifugal pump according to claim 1, characterized in that: The controller can monitor the pump operating current. When the operating current is less than the pump's minimum current, the controller stops the motor to prevent the centrifugal pump from running dry. When the operating current is greater than the motor's rated current, the controller stops the motor.

10. The semi-submersible seal-less vertical centrifugal pump according to claim 1, characterized in that: The impeller adopts an adaptive floating impeller design. A compressible spring is installed in the impeller hub at the pump shaft mounting position. When the conveyed liquid contains a large amount of impurities or fibers with large particles, the upward reaction force is greater than the spring preload, and the impeller can float upward to increase the passage capacity of impurities such as fibers and avoid pump jamming.

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