Novel centrifugal pump

Abstract

The utility model provides a novel centrifugal pump, and belongs to the technical field of water pumps. The centrifugal pump solves the problem that an existing centrifugal pump is prone to being scoured by rapid water flow to cause cavitation. The novel centrifugal pump is characterized by comprising a water pump body, a water inlet and a water outlet are formed in the water pump body, an impeller cavity communicated with the water inlet and the water outlet is further formed in the water pump body, a clamping cavity is formed in the water inlet, a slow flow unit is arranged in the clamping cavity, an overflowing base is arranged on the slow flow unit, and a plurality of overflowing holes are formed in the overflowing base. Flow passing holes are formed in the flow passing base, backflow cavities are formed between the flow passing holes, the backflow cavities and the flow passing holes are formed in an opposite opening mode, slow flow baffle rings are arranged between the backflow cavities, the inner bottoms of the slow flow baffle rings abut against the tail ends of the pipe walls of the flow passing holes, and a detachable filter screen is further arranged on the flow passing base.

Description

Technical Field

[0001] This utility model belongs to the field of water pump technology, and specifically relates to a novel centrifugal pump. Background Technology

[0002] A centrifugal pump is a mechanical device that uses the centrifugal force generated by a rotating impeller to transport liquids. It mainly consists of a pump casing, impeller, shaft, and seals. During operation, the motor drives the impeller to rotate at high speed. Liquid is drawn in from the center of the pump body, thrown towards the outer edge of the impeller under the action of centrifugal force, pressurized through the flow channel of the pump casing, and discharged from the outlet.

[0003] When the impeller rotates at high speed, the liquid velocity increases at the blade inlet or in narrow areas of the flow channel. According to Bernoulli's principle, the increased velocity leads to a decrease in static pressure. If the pressure at this point drops to the saturated vapor pressure of the liquid at its current temperature, the liquid will vaporize and form bubbles. These bubbles, carried by the liquid flow, rapidly collapse when they reach the high-pressure area, instantly generating strong micro-jet streams and shock waves. These waves repeatedly impact the surfaces of the flow components, causing cavitation. Cavitation severely damages the operating performance and service life of centrifugal pumps. When cavitation occurs inside the pump, the collapse of bubbles in the high-pressure area generates shock waves reaching hundreds of megapascals, continuously impacting the impeller and pump casing surfaces. This leads to fatigue spalling of the metal material, forming honeycomb-like pits. Furthermore, when the impeller rotates, the gas, due to its low density, cannot be effectively accelerated, failing to establish a sufficient pressure difference between the pump inlet and outlet, thus losing its conveying capacity. Therefore, it is necessary to develop pumps that reduce cavitation and extend their service life. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned problems in the existing technology by providing a novel centrifugal pump that is easy to install and reduces cavitation.

[0005] The objective of this utility model can be achieved through the following technical solution: A novel centrifugal pump, characterized in that it includes a pump body, the pump body having an inlet and an outlet, the pump body also having an impeller cavity connecting the inlet and the outlet, the inlet having a snap-fit ​​cavity, the snap-fit ​​cavity having a flow-slowing unit, the flow-slowing unit having a flow-through base, the flow-through base having a plurality of flow-through holes, a return cavity being provided between each of the flow-through holes, the return cavity and the flow-through holes being arranged to face each other, a flow-slowing baffle ring being provided between each of the return cavities, the inner bottom of the flow-slowing baffle ring abutting against the end of the wall of the flow-through hole, and the flow-through base also having a detachable filter screen.

[0006] In the aforementioned novel centrifugal pump, the filter screen is provided with an installation ring, the installation ring is provided with connecting threads, and the installation ring is provided with several snap-fit ​​grooves.

[0007] In the aforementioned novel centrifugal pump, drainage grooves are provided on the side walls of the slow-flow baffle ring.

[0008] In the aforementioned novel centrifugal pump, the flow-slowing baffle ring has a flow-guiding rounded corner, and a silicone layer is provided inside the flow-slowing baffle ring.

[0009] Compared with existing technologies, this new centrifugal pump is equipped with a flow-retarding unit at the inlet. By reducing the flow rate, it reduces cavitation during pump operation, thereby increasing the pump's service life. The movable flow-retarding baffle on the circulation unit reduces the rate of water loss inside the pump, reducing the need for water injection during pump startup and making operation simpler. The filter screen can filter impurities and also limit the movement of the flow-retarding baffle, preventing it from moving excessively and falling off. Attached Figure Description

[0010] Figure 1 This is a structural adaptation diagram of this new type of centrifugal pump.

[0011] Figure 2 This is a half-section structural adaptation diagram of the slow-flow unit of this novel centrifugal pump.

[0012] Figure 3 This is a structural adaptation diagram of the semi-planed body of the new centrifugal pump.

[0013] In the diagram, 1. Inlet; 2. Outlet; 3. Pump body; 4. Flow control unit; 5. Return chamber; 6. Flow passage hole; 7. Flow base; 8. Mounting ring; 9. Drainage channel; 10. Guide radius; 11. Filter screen; 12. Flow control ring; 13. Snap-fit ​​groove; 14. Connecting thread; 15. Impeller cavity; 16. Snap-fit ​​cavity. Detailed Implementation

[0014] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0015] like Figure 1 , 2As shown in Figure 3, this novel centrifugal pump includes a pump body 3, with an inlet 1 and an outlet 2. The pump body 3 also has an impeller cavity 15 connecting the inlet 1 and the outlet 2. The inlet 1 has a snap-fit ​​cavity 16, within which a flow-slowing unit 4 is located. The flow-slowing unit 4 has a flow-through base 7, which has several flow-through holes 6. A return flow cavity 5 is located between each flow-through hole 6, opening opposite to the flow-through holes 6. A flow-slowing baffle ring 12 is located between each return flow cavity 5. The inner bottom of the 2-channel abuts against the end of the pipe wall of the flow passage 6. The flow passage base 7 is also equipped with a removable filter screen 11. When the water pump starts, the water flows in through the inlet 1 and impacts the slow flow unit 15. The water flows through the flow passage 6 and is divided and impacts the slow flow baffle ring 12, pushing the circulating baffle ring. The water flows through the slow flow baffle ring 12 and changes the direction of the water flow. The water flows out from both sides of the slow flow baffle ring 12 and enters the return chamber 5 in the opposite direction. Then it enters the impeller chamber 16 from the return chamber 5. By changing the direction of the water flow multiple times, the flow velocity of the water flow is reduced, and finally it is discharged from the outlet 2.

[0016] Preferably, the filter screen 11 is provided with an installation ring 8, the installation ring 8 is provided with a connecting thread 14, and the installation ring 8 is provided with a plurality of snap-fit ​​grooves 13. The filter screen 11 is connected to the flow base 7 through the connecting thread 14, which can facilitate the replacement and cleaning of the filter screen 11. At the same time, the flow area is controlled by controlling the distance between the filter screen 11 and the slow flow baffle ring 12, thereby further controlling the flow rate.

[0017] Preferably, the sidewalls of the flow-slowing baffle ring 12 are provided with drainage channels 9. Water flows out through the drainage channel, increasing the flow rate of the inlet 1. At the same time, water flows out through the drainage channels 9, so that the sidewalls of the flow-slowing baffle ring 12 abut against the inner wall of the return cavity 5, reducing the structure of fixing the flow-slowing baffle ring 12.

[0018] Preferably, the slow-flow baffle ring 12 has a flow guide rounded corner 10 inside, and a silicone layer is provided inside the slow-flow baffle ring 12. The flow guide rounded corner 10 can effectively guide the water flow and reduce air bubbles. The silicone layer increases the sealing performance. When the water pump is turned off, the water in the water pump body 3 will flow back and impact the slow-flow guide ring, causing the slow-flow baffle ring 12 to close the flow passage hole 6. The sealing performance of the silicone layer makes the slow-flow baffle ring 12 act as a one-way valve. The water is kept in the water pump body 3 for a short time, reducing the need for water injection when the centrifugal pump is frequently started in a short period of time.

[0019] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

[0020] Although this document frequently uses terms such as inlet 1, outlet 2, pump body 3, pump body 4, return cavity 5, flow passage 6, flow passage base 7, mounting ring 8, drainage channel 9, guide radius 10, filter screen 11, flow-slowing baffle ring 12, snap-fit ​​groove 13, connecting thread 14, flow-slowing unit 15, impeller cavity 16, and snap-fit ​​cavity 17, the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any additional limitation would contradict the spirit of this utility model.

Claims

1. A new type of centrifugal pump characterized in that, Including water pump body (3), water inlet (1) and water outlet (2) are equipped on the water pump body (3), the water pump body (3) is further equipped with the impeller cavity (15) that communicates water inlet (1) and water outlet (2), the water inlet (1) is equipped with the clamping cavity (16), the clamping cavity (16) is equipped with the slow flow unit (4), the slow flow unit (4) is equipped with the overflow base (7), the overflow base (7) is equipped with a plurality of overflow holes (6), the backflow cavity (5) is located between the overflow holes (6) and is equipped, the backflow cavity (5) and overflow hole (6) are opposite and open, the slow flow baffle ring (12) is located between the backflow cavity (5) and is equipped, the inner bottom of the slow flow baffle ring (12) and the end of overflow hole (6) pipe wall are in contact, the overflow base (7) is further equipped with detachable filter screen (11).

2. A new type of centrifugal pump according to claim 1, characterized in that, The filter screen (11) is equipped with mounting ring (8), the mounting ring (8) is equipped with connecting thread (14), and a plurality of clamping through slots (13) are formed in the mounting ring (8).

3. A new type of centrifugal pump as claimed in claim 1, characterized in that, The side wall of the slow flow baffle ring (12) is equipped with a drainage through slot (9).

4. A new type of centrifugal pump as claimed in claim 1, characterized in that, The slow flow baffle ring (12) is equipped with a flow guide round corner (10), and a silica gel layer is arranged inside the slow flow baffle ring (12).

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