Built-in lubricating double suction pump

Abstract

The utility model discloses a built-in lubricating double suction pump which comprises a base and a pump body, the pump body is arranged at the top of the base and provided with a bottom shell arranged at the top of the base, a top cover is arranged at the top of the bottom shell, a built-in pipeline is arranged in the top cover, the bottom shell and the top cover form a cavity, a sealing chamber is arranged in the cavity, and the sealing chamber is communicated with the bottom shell. The built-in pipeline is communicated with the sealing chamber, and water enters the sealing chamber from the built-in pipeline in the chamber to achieve cooling operation. By arranging the pump body and the built-in pipeline, built-in lubrication and cooling of a sealing system can be achieved, an external circulation pipeline is not needed, the pump body structure is simplified, sealing reliability is improved, and meanwhile installation and maintenance cost is reduced; optimized regulation and control of the flow velocity and the pressure are achieved through gradual contraction-gradual expansion section change, and the flow velocity and the pressure of the lubricating liquid can be automatically adjusted through the Venturi effect.

Description

Technical Field

[0001] This utility model relates to the field of dual-suction pump technology, specifically a built-in lubricated dual-suction pump. Background Technology

[0002] A double-suction pump is a specially designed centrifugal pump whose core feature is that water is simultaneously drawn in from both sides of the impeller, converging at the center of the impeller before being discharged. This design gives it unique advantages and makes it widely applicable in high-flow-rate, high-head applications.

[0003] Existing double-suction pumps typically use external circulation pipelines to cool and lubricate mechanical seals or packing seals, resulting in complex structures, large space requirements, and susceptibility to leaks or blockages in the pipelines, which can affect sealing performance. Furthermore, most double-suction pumps have their suction and discharge ports located on opposite sides of the pump body, requiring disassembly of the inlet and outlet pipes when overhauling the rotor components, which increases maintenance time and costs. Utility Model Content

[0004] The purpose of this utility model is to provide a built-in lubrication double-suction pump to solve the problems mentioned in the background art. Existing double-suction pumps usually use external circulation pipelines to cool and lubricate mechanical seals or packing seals, resulting in complex structures, large space occupation, and easy to affect sealing performance due to pipeline leakage or blockage. In addition, most double-suction pumps have their suction and discharge ports located on both sides of the pump body, and the inlet and outlet pipelines need to be disassembled when repairing rotor components, which increases maintenance time and cost.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a built-in lubrication double-suction pump, comprising a base and a pump body:

[0006] The pump body is located on top of the base and has a bottom shell on top of the base. The bottom shell has a top cover on top of the top cover, and an internal pipe is opened inside the top cover. The bottom shell and the top cover form a chamber, and a sealed chamber is set in the chamber. The internal pipe is connected to the sealed chamber. Water enters the sealed chamber from the internal pipe in the chamber to achieve cooling. The pump body also has an impeller set inside the pump body. The impeller is coaxially connected to the main shaft. The impeller has symmetrical suction ports on both sides. The impeller adopts an asymmetrical blade wrap angle design, with the blade angle on the inlet side being slightly larger than that on the outlet side. The internal pipe is a Venturi flow channel design, which achieves optimized control of flow rate and pressure through the gradual contraction and expansion of the cross section.

[0007] By adopting the above technical solutions, the sealing system can achieve built-in lubrication and cooling, eliminating the need for external circulation pipelines, simplifying the pump body structure, improving sealing reliability, and reducing installation and maintenance costs. It can achieve high-efficiency operation of the dual-suction pump. The asymmetric blade design optimizes fluid dynamics performance, improves pump efficiency, and reduces the risk of cavitation. At the same time, it utilizes the Venturi effect to automatically adjust the lubricant flow rate and pressure, forming a low-pressure zone in the throat to enhance the suction effect of the sealing cavity, and restoring pressure in the diffuser section to ensure sufficient lubrication, thereby improving the reliability of the sealing system.

[0008] Preferably, the built-in pipe is symmetrically opened inside the top cover along the axis of the top cover, and the top outer side of the top cover is provided with reinforcing ribs.

[0009] By adopting the above technical solution, it can be ensured that the lubricant is evenly distributed to both sides of the sealing system, avoiding insufficient lubrication on one side; the setting of the reinforcing ribs not only improves the structural strength of the top cover, but also does not affect the arrangement of the internal pipes, thus achieving a balance between strength and function.

[0010] Preferably, the bottom shell and the top cover are fixedly connected by bolts. Both the bottom shell and the top cover are made of resin sand mold to ensure the appearance, flow channel size and hydraulic efficiency of the pump. The bottom ends of the bottom shell are respectively provided with suction pipe and discharge pipe.

[0011] By adopting the above technical solutions, the pump body can be quickly disassembled and maintained. The resin sand casting process ensures the smoothness and dimensional accuracy of the flow channel surface, and improves the hydraulic efficiency of the pump. The symmetrical arrangement of the suction inlet and suction outlet pipes is conducive to the balanced transport of fluid.

[0012] Preferably, the pump body also has a main shaft that is transversely inserted inside the pump body, and bushings are provided at both ends of the main shaft, the bushings being connected to bearings provided inside the sealing chamber.

[0013] By adopting the above technical solutions, the stability and coaxiality of the spindle operation can be ensured. The bushing design not only protects the spindle surface but also facilitates replacement after wear, reducing maintenance costs.

[0014] Preferably, the spindle has a shortened shaft spacing and an increased shaft diameter to extend the service life of the sealing chamber and the bearings inside the sealing chamber, and the spindle has a fully enclosed structure.

[0015] By adopting the above technical solutions, the rigidity and bending resistance of the spindle can be improved, and vibration and runout can be reduced; the fully enclosed structure effectively prevents the spindle from being corroded by the medium, thus extending its service life.

[0016] Preferably, the pump body also has an impeller disposed inside the pump body, the impeller is coaxially connected to the main shaft, the impeller has symmetrical suction ports on both sides, and the impeller adopts an asymmetrical blade wrap angle design with the inlet side blade angle being slightly larger than the outlet side.

[0017] Preferably, the gap between the impeller and the top cover forms a discharge chamber and is connected to the built-in pipe.

[0018] By adopting the above technical solution, the output pressure of the pump itself can be used to provide lubrication power for the sealing system without the need for an additional power source, thus achieving efficient energy utilization and simplified system design.

[0019] Compared with the prior art, the beneficial effects of this utility model are as follows: By setting up a pump body and built-in pipes, this invention can realize built-in lubrication and cooling of the sealing system, eliminating the need for external circulation pipelines, simplifying the pump body structure, improving sealing reliability, and reducing installation and maintenance costs; the built-in pipes are designed with a Venturi flow channel, which achieves optimized control of flow rate and pressure through the gradual contraction-expansion cross-section change. It can automatically adjust the flow rate and pressure of lubricating fluid by utilizing the Venturi effect, forming a low-pressure zone at the throat to enhance the suction effect of the sealing cavity, and restoring pressure in the diffusion section to ensure sufficient lubrication, thereby improving the reliability of the sealing system. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of this application;

[0021] Figure 2 This is a schematic diagram of the overall exploded structure of the parts in this application;

[0022] Figure 3 This is a schematic diagram of the overall side view sectional structure of this application.

[0023] In the diagram: 1. Base; 2. Pump body; 201. Bottom shell; 202. Top cover; 203. Internal pipe; 204. Sealing chamber; 205. Main shaft; 206. Impeller. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Example 1: Please refer to Figure 1 , Figure 2 and Figure 3 This embodiment provides a technical solution: a built-in lubrication double-suction pump, including a base 1 and a pump body 2.

[0026] The pump body 2 is fixedly installed on the top of the base 1 by anchor bolts. The pump body 2 has a bottom shell 201 set on the top of the base 1. The bottom shell 201 is fastened to the top cover 202 by flange bolts. The top cover 202 has an internal pipe 203 made by precision machining. The bottom shell 201 and the top cover 202 are sealed to form a chamber by O-ring seals. A sealing chamber 204 is set in the chamber. The internal pipe 203 is connected to the sealing chamber 204 by a threaded interface. Water enters the sealing chamber 204 from the internal pipe 203 in the chamber to achieve cooling. This can realize the internal lubrication and cooling of the sealing system, eliminating the need for external circulation pipelines, simplifying the structure of the pump body 2, improving sealing reliability, and reducing installation and maintenance costs.

[0027] The desired effect of this embodiment is that, through the integrated design of the built-in lubrication system, the self-sufficient cooling and lubrication of the dual-suction pump sealing system is realized, which effectively solves the problems of complex structure and easy leakage of traditional external circulation pipelines, making the pump body 2 more compact and easier to maintain.

[0028] Example 2: Please refer to Figure 1 , Figure 2 and Figure 3 This embodiment provides a technical solution: a built-in lubrication double-suction pump, including a pump body 2, a bottom shell 201, and a top cover 202.

[0029] The built-in pipe 203 is symmetrically machined along the axis of the top cover 202 and is located inside the top cover 202. The top outer side of the top cover 202 is welded with reinforcing ribs to ensure that the lubricant is evenly distributed to both sides of the sealing system and to avoid insufficient lubrication on one side. The setting of the reinforcing ribs not only improves the structural strength of the top cover 202, but also does not affect the arrangement of the built-in pipe 203, thus achieving a balance between strength and function.

[0030] The bottom shell 201 and the top cover 202 are fixedly connected by bolts. Both the bottom shell 201 and the top cover 202 are made of resin sand mold, which ensures the appearance, flow channel size and hydraulic efficiency of the pump. The bottom ends of the bottom shell 201 are respectively connected by flanges to the suction port pipe and the discharge port pipe, which can realize the quick disassembly and maintenance of the pump body 2. The resin sand casting process ensures the smoothness and dimensional accuracy of the flow channel surface and improves the hydraulic efficiency of the pump. The symmetrical arrangement of the suction port and the suction port pipe is conducive to the balanced transportation of fluid.

[0031] The pump body 2 also has a main shaft 205 that is transversely inserted inside the pump body 2. The main shaft 205 is fixed to the bushings at both ends by a key connection. The bushings are connected to the bearings inside the sealing chamber 204 by an interference fit, which can ensure the stability and coaxiality of the main shaft 205 during operation. The bushing design protects the surface of the main shaft 205 and facilitates replacement after wear, reducing maintenance costs. When in use, the main shaft 205 needs to be connected to an external motor through a coupling. The motor drives the main shaft 205 to rotate. The working principle of the motor is based on electromagnetic induction and Lorentz force. The motor generates force in the magnetic field through current, thereby driving mechanical motion. The above is the existing technology and will not be elaborated further below. When selecting the model, its power should be selected to suit the needs of the device to ensure that the object to be driven is driven.

[0032] The spindle 205 adopts a design that shortens the shaft spacing and increases the shaft diameter, and is precision machined to extend the service life of the sealing chamber 204 and the bearings inside the sealing chamber 204. The spindle 205 is a fully enclosed structure with a chrome-plated surface. This improves the rigidity and bending resistance of the spindle 205, reduces vibration and runout; the fully enclosed structure effectively prevents media corrosion of the spindle 205, extending its service life.

[0033] The pump body 2 also has an impeller 206 installed inside the pump body 2. The impeller 206 is coaxially fixed to the main shaft 205 by a locking nut. The impeller 206 has symmetrical suction ports on both sides. The impeller 206 adopts an asymmetric blade wrap angle design. The blade angle on the inlet side is slightly larger than that on the outlet side, which can realize the efficient operation of the double suction pump. The asymmetric blade design optimizes the fluid dynamics performance, improves the pump efficiency, and reduces the risk of cavitation.

[0034] The built-in pipe 203 is designed with a Venturi flow channel. The tapered-expanding cross section is machined by a five-axis linkage machining center to achieve optimized control of flow rate and pressure. It can automatically adjust the flow rate and pressure of lubricant by utilizing the Venturi effect, forming a low-pressure zone at the throat to enhance the suction effect of the sealing cavity, and restoring pressure in the diffusion section to ensure sufficient lubrication, thereby improving the reliability of the sealing system.

[0035] The gap between the impeller 206 and the top cover 202 forms a discharge chamber and is connected to the built-in pipe 203 through a guide groove. The pump's own output pressure can be used to provide lubrication power for the sealing system without the need for an additional power source, thus achieving efficient energy utilization and simplified system design.

[0036] The desired effect of this second embodiment is that by optimizing the structure and connection method of each key component, the efficient and stable operation of the dual-suction pump is achieved, while improving the reliability and service life of the sealing system and reducing maintenance costs.

[0037] Working Principle: First, when the pump starts, the impeller 206 rotates under the drive of the main shaft 205. Liquid enters the pump chamber simultaneously from both suction ports, gains energy under the action of the impeller 206, and is discharged from the discharge port. During this process, some high-pressure liquid enters the internal pipe 203 through the discharge chamber between the impeller 206 and the top cover 202. After being regulated by the Venturi flow channel structure, it enters the sealing chamber 204 to lubricate and cool the mechanical seal. The lubricated liquid returns to the pump chamber for recycling, forming a complete self-lubricating system. Throughout the process, the special structure of the Venturi flow channel ensures automatic regulation of the lubricating fluid flow rate and pressure. The asymmetric blade design inside the impeller 206 optimizes the fluid flow state, and the shortened shaft spacing and increased shaft diameter improve the rotor stability, thereby achieving efficient and reliable operation of the double-suction pump.

[0038] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0039] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A built-in lubricating double-suction pump, characterized in that, include: Base; The pump body is located on top of the base and has a bottom shell on top of the base. The top shell has a top cover, and the top cover has an internal pipe. The bottom shell and the top cover form a chamber, and a sealed chamber is set in the chamber. The internal pipe is connected to the sealed chamber. Water enters the sealed chamber from the internal pipe in the chamber to achieve cooling. The pump body also has an impeller located inside the pump body and is coaxially connected to the main shaft. The impeller has symmetrical suction ports on both sides. The impeller adopts an asymmetrical blade wrap angle design, with the blade angle on the inlet side being slightly larger than that on the outlet side. The internal pipe is a Venturi flow channel design, which achieves optimized control of flow rate and pressure through the gradual contraction and expansion of the cross section.

2. The built-in lubrication double-suction pump according to claim 1, characterized in that: The built-in pipes are symmetrically opened inside the top cover along its axis, and the top outer side of the top cover is provided with reinforcing ribs.

3. The built-in lubrication double-suction pump according to claim 1, characterized in that: The bottom shell and the top cover are fixedly connected by bolts. Both the bottom shell and the top cover are made of resin sand mold to ensure the appearance, flow channel size and hydraulic efficiency of the pump. The bottom of the bottom shell is provided with an inlet pipe and an outlet pipe at both ends.

4. The built-in lubrication double-suction pump according to claim 1, characterized in that: The pump body also has a main shaft that is horizontally inserted inside the pump body, and bushings are provided at both ends of the main shaft. The bushings are connected to bearings provided inside the sealing chamber.

5. A built-in lubrication double-suction pump according to claim 4, characterized in that: The spindle has a shortened shaft spacing and an increased shaft diameter to extend the service life of the sealing chamber and the bearings inside the sealing chamber, and the spindle is a fully enclosed structure.

6. The built-in lubrication double-suction pump according to claim 1, characterized in that: The gap between the impeller and the top cover forms a discharge chamber that is connected to the built-in pipe.

Images