Self-priming centrifugal pump

Abstract

This utility model relates to the field of centrifugal pump technology, specifically to a self-priming centrifugal pump. It includes a base, with a motor and pump body symmetrically arranged above the base. An impeller is located inside the pump body, and an impeller shaft is rotatably connected to the center of the impeller. An internal spline is rotatably connected to one end of the impeller shaft, engaging with an external spline at one end of the motor shaft. The disassembly / assembly mechanism includes a threaded component coaxially fixed to the motor shaft. A fixing component is threadedly connected to the outer side of the threaded component. A fixing ring is fixed to the motor shaft between the threaded component and the external spline. Multiple elastic claws are circumferentially distributed on the outer side of the fixing ring. A wedge-shaped protrusion is provided on the side of the elastic claw facing the impeller shaft. When the fixing component rotates along the threaded component and moves axially, the end with the larger opening diameter applies radial compressive force to the elastic claw, forcing the wedge-shaped protrusion into the height difference groove formed by the internal spline and the end face of the impeller shaft, thus achieving axial locking between the impeller shaft and the motor shaft.

Description

Technical Field

[0001] This utility model relates to the field of centrifugal pump technology, and more specifically, to a self-controlled self-priming centrifugal pump. Background Technology

[0002] Self-priming centrifugal pumps are a type of centrifugal pump. Before starting them for the first time, the pump casing must be filled with water. Otherwise, the pump body will overheat, vibrate, and the water output will decrease, which will damage the pump and cause equipment accidents (referred to as "cavitation"). Moreover, when construction workers and firefighters use self-priming centrifugal pumps to collect water in the field, they often need to change different water collection points due to work requirements.

[0003] Seal-less self-priming pumps are available in both vertical and horizontal configurations. Some seal-less self-priming pumps use a coupling to fix the motor output to the centrifugal pump input. Because centrifugal pumps generate significant torque on the input shaft and motor output shaft during media transport, the coupling may become loose or damaged after a period of use. Since the motor and centrifugal pump in a seal-less self-priming pump are bolted to the base, disassembling and maintaining the coupling requires handling the heavy motor or centrifugal pump. The machine is disassembled first, making the disassembly and maintenance of the coupling very cumbersome. To address this, Chinese Patent Publication No. CN219654904U provides a sealless self-priming pump. By adjusting the screw and rotating it within the second fixed block at the bottom of the two second support seats, the motor can be moved horizontally quickly after the coupling becomes loose, facilitating the rapid disassembly and assembly of the coupling. At the same time, the operating handle is mounted on the handwheel via a rotating block, and works with the limiting teeth and the second limiting groove to limit the handwheel, thereby limiting the adjusting screw and preventing displacement after the second support seats are fixed.

[0004] In the aforementioned technical solution, the motor is moved horizontally by rotating the adjusting screw within the screw hole of the second fixed block and using the first limiting groove. When the machine is running, the strong vibrations generated by the machine may cause the adjusting screw to deviate, making the coupling connection unstable and leading to disengagement. Utility Model Content

[0005] This utility model provides a self-controlled, self-priming centrifugal pump. By incorporating a disassembly and assembly mechanism, when the internal spline and external spline are engaged, rotating the fixing component causes axial displacement. The inclined opening of the fixing component gradually presses against the elastic jaws, causing the wedge-shaped protrusion at one end of the elastic jaws to nest within the height groove formed by the impeller shaft and the internal spline. This solves the problem mentioned in the background art, namely:

[0006] In the existing technology, the motor can be moved horizontally by adjusting the lead screw. When the machine is running and generates strong vibrations, the lead screw may become misaligned, making the coupling connection unstable and causing it to detach.

[0007] To achieve the above objectives, the centrifugal pump includes a base, on which a motor and a pump body are symmetrically arranged, and a pump body impeller is provided inside the pump body.

[0008] An impeller shaft is rotatably connected to the center of the pump body impeller, and a disassembly and assembly mechanism is provided between the impeller shaft and the motor shaft at the motor output end.

[0009] One end of the impeller shaft is rotatably connected to an internal spline, which meshes with an external spline at one end of the motor shaft.

[0010] The disassembly and assembly mechanism includes a threaded component that is coaxially fixed to the motor shaft, and a fixing component is threadedly connected to the outer side of the threaded component;

[0011] The motor shaft is fixed with a retaining ring between the threaded part and the external spline. Multiple elastic claws are distributed circumferentially on the outer side of the retaining ring, and the side of the elastic claws facing the impeller shaft has a wedge-shaped protrusion.

[0012] The ratio of the diameter of the end face opening on the side of the fixing member closest to the fixing ring to the diameter of the opening on the other side is 1.5:1.

[0013] In the above technical solution, during use, the internal spline at the impeller shaft end and the external spline at one end of the motor shaft first engage to form a linkage. Then, the fixing part is rotated along the threaded part to make the fixing part axially displaced. As the fixing part displaces, the diameter of the notch that contacts the elastic claw gradually decreases, and the squeezing force on the elastic claw becomes more and more concentrated until the wedge-shaped protrusion at the end of the elastic claw is completely embedded in the groove formed by the height difference between the internal spline and the end face of the impeller shaft, thereby achieving axial locking of the impeller shaft and the motor shaft. When using the adjusting screw in the existing technology for displacement, it is only necessary to rotate the fixing part counterclockwise to make the squeezing force of the fixing part on the elastic claw disappear. The elastic claw then relies on its own elasticity to reset and disengage from the groove.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] The screw drive of the disassembly and assembly mechanism and the radial compression locking of the elastic claws are used to lock the fastener. The conical opening of the fastener and the triangular wedge of the elastic claw cooperate to form a surface contact lock, which effectively resists loosening caused by vibration. At the same time, the inner and outer splines transmit torque, and the stepped difference design of the fixing ring and the slot ensures the locking depth, significantly improving the stability of the connection. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a partial structural diagram of the centrifugal pump of this utility model;

[0018] Figure 3 This is a schematic diagram of the disassembly and assembly mechanism of this utility model.

[0019] The meanings of the labels in the diagram are as follows:

[0020] 100. Base; 101. Motor; 102. Pump body; 103. Pump impeller; 104. Impeller shaft; 105. Motor shaft;

[0021] 200. Assembly / disassembly mechanism; 201. Threaded component; 202. Fixing component; 203. Retaining ring; 204. Elastic pawl; 205. External spline; 206. Internal spline. Detailed Implementation

[0022] 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.

[0023] Currently, in existing technologies, the motor 101 can be moved horizontally by adjusting a lead screw. However, when the machine vibrates strongly during operation, the lead screw may shift, causing the coupling connection to become unstable and potentially disengage. This invention provides a self-controlled, self-priming centrifugal pump. (See [link]) Figures 1-3 As shown, it includes a base 100, a motor 101 and a pump body 102 are symmetrically arranged above the base 100, and a pump impeller 103 is provided inside the pump body 102.

[0024] An impeller shaft 104 is rotatably connected at the center of the pump body impeller 103, and a disassembly and assembly mechanism 200 is provided between the impeller shaft 104 and the motor shaft 105 at the output end of the motor 101.

[0025] An internal spline 206 is rotatably connected to one end of the impeller shaft 104, and the internal spline 206 meshes with the external spline 205 at one end of the motor shaft 105.

[0026] The disassembly and assembly mechanism 200 includes a threaded part 201 that is coaxially fixed with the motor shaft 105, and a fixing part 202 is threadedly connected to the outside of the threaded part 201;

[0027] A retaining ring 203 is fixed between the threaded part 201 and the external spline 205 on the motor shaft 105. Multiple elastic claws 204 are distributed circumferentially on the outer side of the retaining ring 203. The elastic claws 204 have wedge-shaped protrusions on the side facing the impeller shaft 104.

[0028] The ratio of the diameter of the end face opening on the side of the fastener 202 closest to the fixing ring 203 to the diameter of the opening on the other side is 1.5:1.

[0029] See Figure 3 As shown, during assembly, the internal spline 206 at the end of the impeller shaft 104 is first aligned and engaged with the external spline 205 of the motor shaft 105 to ensure the integrity of the torque transmission path. Then, the fixing member 202 is rotated so that it moves axially along the external thread of the threaded member 201 toward the fixing ring 203. The fixing ring 203 is fixed to the motor shaft 105 by keyway fitting or welding. The tapered transition surface of the larger opening diameter side of the fastener 202, with a diameter ratio of 1.5:1, gradually contacts the outer side of the elastic claw 204. As the fastener 202 continues to screw in, the tapered transition surface forces the elastic claw 204 to compress and deform radially inward, causing the wedge-shaped protrusion to engage with the height difference groove between the end face flange of the inward spline 206 and the end face of the impeller shaft 104. When the fastener 202 is tightened to its limit position, the inclined planes on both sides of the triangular wedge of the elastic claw 204 make full contact with the inclined surface of the groove, completing the axial locking of the impeller shaft 104 and the motor shaft 105. At the same time, the end face of the larger opening diameter side of the fastener 202 is a tapered transition surface, and its taper is adapted to the radial compression deformation of the elastic claw 204.

[0030] The elastic claws 204 are made of spring steel. In this embodiment, six elastic claws 204 are preferably used, evenly distributed around the circumference of the fixing ring 203 to ensure balanced force distribution. The inner side of the fixing member 202 is provided with an internal thread that matches the threaded member 201. The tapered transition surface on the side with the larger opening diameter has a taper of 30° to adapt to the compression deformation of the claw. When the fixing member 202 rotates, the contact area between the tapered surface and the elastic claws 204 gradually decreases, and the compressive force is concentrated at the root of the claw, forcing the wedge-shaped protrusion to press into the height difference groove in a surface contact manner. The groove depth is 2mm, which is greater than the thickness of the wedge-shaped protrusion by 1.5mm to prevent axial movement after locking. During disassembly, the fixing member 202 is rotated in the opposite direction, the pressure on the tapered surface is released, and the elastic claws 204 rely on their own elasticity to reset and disengage from the groove, achieving rapid separation.

[0031] Working principle: During assembly, the internal spline 206 and external spline 205 mesh to transmit torque. The rotating fixed part 202 moves axially along the threaded part 201, and its conical opening gradually compresses the elastic claw 204 on the fixed ring 203, forcing the triangular wedge-shaped protrusion of the claw to embed into the height difference groove formed by the end face of the impeller shaft 104 and the internal spline 206, forming a surface contact axial lock. During disassembly, the fixed part 202 is rotated in the opposite direction to release the radial pressure, and the elastic claw 204 resets and disengages from the groove. Through the dual action of mechanical interlocking and spline meshing, it resists vibration and loosening.

[0032] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A self-priming centrifugal pump, comprising a base (100), characterized in that: A motor (101) and a pump body (102) are symmetrically arranged above the base (100), and a pump impeller (103) is provided inside the pump body (102); An impeller shaft (104) is rotatably connected at the center of the pump body impeller (103), and a disassembly and assembly mechanism (200) is provided between the impeller shaft (104) and the motor shaft (105) at the output end of the motor (101); An internal spline (206) is rotatably connected to one end of the impeller shaft (104), and the internal spline (206) meshes with an external spline (205) at one end of the motor shaft (105); The disassembly and assembly mechanism (200) includes a threaded component (201) that is coaxially fixed with the motor shaft (105), and a fixing component (202) is threadedly connected to the outside of the threaded component (201); The motor shaft (105) is fixed with a retaining ring (203) between the threaded part (201) and the external spline (205). The retaining ring (203) has multiple elastic claws (204) distributed circumferentially on its outer side. The elastic claws (204) have wedge-shaped protrusions on the side facing the impeller shaft (104). The ratio of the diameter of the end face opening on the side of the fastener (202) closest to the fixing ring (203) to the diameter of the opening on the other side is 1.5:1; When the fixing member (202) rotates and moves axially along the threaded member (201), the end with the larger opening diameter applies radial extrusion force to the elastic claw (204), forcing the wedge-shaped protrusion to embed into the height difference groove formed by the inner spline (206) and the end face of the impeller shaft (104), thereby achieving axial locking between the impeller shaft (104) and the motor shaft (105).

2. The self-priming centrifugal pump according to claim 1, characterized in that: The wedge-shaped protrusion of the elastic claw (204) is a triangular wedge structure with two inclined planes on its two sides, which form a surface contact with the inclined surface of the height difference groove.

3. The self-priming centrifugal pump according to claim 1, characterized in that: The inner side of the fastener (202) is provided with an internal thread that matches the external thread of the threaded part (201).

4. The self-priming centrifugal pump according to claim 1, characterized in that: The larger opening diameter of the fastener (202) is a tapered transition surface, and its taper is adapted to the radial compression deformation of the elastic claw (204).

5. The self-priming centrifugal pump according to claim 1, characterized in that: The number of elastic claws (204) is 3-6, and they are evenly distributed around the circumference of the fixing ring (203).

6. The self-priming centrifugal pump according to claim 1, characterized in that: The retaining ring (203) is fixed to the motor shaft (105) by keyway fitting or welding.

7. The self-priming centrifugal pump according to claim 1, characterized in that: The height difference groove is formed by the step difference between the end face flange of the inner spline (206) and the end face of the impeller shaft (104), and its depth is greater than the thickness of the wedge-shaped protrusion of the elastic claw (204).

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