Self-filling centrifugal pump

Abstract

The invention belongs to the technical field of centrifugal pumps, and discloses a self-filling centrifugal pump which comprises a motor pump body and a control valve. A water inlet is formed in the top of the filter bucket barrel, a water outlet is formed in the bottom of the filter bucket barrel, and the water outlet is connected with the water inlet of the motor pump body through a control valve; the plurality of swing mechanisms are mounted in the filter hopper barrel in an annular array; each swinging mechanism is provided with one upper layer fragmentation filter screen; the lower-layer movable filter screen is arranged in the filter hopper barrel in a manner of moving up and down and is positioned below the upper-layer fragmentation filter screen; the transmission mechanism is connected with the swing mechanism and the lower-layer movable filter screen, and when the upper-layer fragmented filter screen swings downwards, the lower-layer movable filter screen is lifted by the transmission mechanism. A water source enters the filter hopper cylinder and then impacts the upper-layer fragmented filter screen to swing, when the flow is increased, the swing number or amplitude of the filter screen is increased, and drainage is adjusted as required to avoid affecting the efficiency of the centrifugal pump; meanwhile, the lower-layer filter screen slightly displaces, impurities are dispersed, blockage is avoided, and the hydrophobic performance is maintained.

Description

Technical Field

[0001] The invention relates to the technical field of centrifugal pumps, in particular to a self-priming centrifugal pump. Background Art

[0002] A centrifugal pump is a pump that transports liquid by the centrifugal force generated by the rotation of the impeller. The basic structure of a centrifugal pump consists of eight parts: impeller, pump body, pump cover, water retaining ring, pump shaft, bearing, sealing ring, stuffing box and axial force balancing device.

[0003] Before starting the centrifugal pump, in order to prevent the occurrence of air binding, the air inside the centrifugal pump needs to be discharged. Therefore, before starting the centrifugal pump, the space inside the pump casing needs to be filled with liquid. This step is called priming the pump. There are currently two ways to priming the pump: One is to manually use a water filling funnel and directly install the water filling funnel on the water filling port of the pump. This method can only facilitate the addition of liquid and requires manual filling, and cannot fully realize the self-filling function.

[0004] The other is to "use underground water pools" and "construct underground fully self-priming pumping stations into ground or semi-underground pumping stations". This method is easily restricted by the site because it requires arranging a water station at a specific site to divert water, and the water source cannot be initially filtered when tanking water. If too much debris is involved, it will affect the working condition of the centrifugal pump or even damage it.

[0005] As the demand for high efficiency and energy saving in scenarios such as smart water services and precision irrigation increases, filtration and flow regulation are also crucial. Traditional filtration and flow regulation systems usually adopt a separate design, that is, the filtration device and the flow control valve operate independently, which leads to the following technical bottlenecks: Additional valves, pump groups or electronic controllers are required to achieve flow regulation, which results in bulky equipment and increased installation and maintenance costs. Traditional fixed filter layers are easily clogged due to impurity accumulation, which increases water flow resistance and causes an uncontrollable decrease in water flow, requiring frequent backwashing or replacement of filter materials. Mechanical valves or electronic regulators are easily affected by pressure fluctuations under low flow conditions, making it difficult to achieve stable, precise control of small flows. Summary of the invention

[0006] The purpose of the embodiment of the present invention is to provide a self-priming centrifugal pump to solve the technical problems of inconvenient priming, poor filtration and unstable flow control of centrifugal pumps existing in the related art.

[0007] According to an embodiment of the present invention, there is provided a self-priming centrifugal pump, comprising: Motor pump body and control valve; A filter bucket, having a water inlet on the top and a water outlet on the bottom, wherein the water outlet is connected to the water inlet of the motor pump body through the control valve; A number of swing mechanisms are installed in the filter hopper cylinder in an annular array; Upper-layer segmented filter screens, with one upper-layer segmented filter screen installed on each swing mechanism. When all the upper-layer segmented filter screens are closed, they form a complete surface; Lower-layer movable filter screen, which is arranged in the filter hopper cylinder in a vertically movable manner and is located below the upper-layer segmented filter screens; A transmission mechanism, which connects the swing mechanism and the lower-layer movable filter screen. When the upper-layer segmented filter screens swing downward, the lower-layer movable filter screen is lifted by the transmission mechanism.

[0008] Optionally, a number of grooves for installing the swing mechanisms are opened along the circumferential direction inside the filter hopper cylinder, and the grooves are opened along the axial direction.

[0009] Optionally, a notch is opened at the position of the lower-layer movable filter screen on the side of the filter hopper cylinder, and a maintenance side cover is installed on the notch.

[0010] Optionally, a connecting flange is installed at the water inlet of the filter hopper cylinder.

[0011] Optionally, the swing mechanism includes a mounting ring seat, a reciprocating self-swinging shaft, and a connecting sector plate. The mounting ring seat is fixed on the inner wall of the filter hopper cylinder, the connecting sector plate is fixed on the reciprocating self-swinging shaft, the reciprocating self-swinging shaft is pivotally connected to the mounting ring seat, and the upper-layer segmented filter screen is fixed on the connecting sector plate.

[0012] Optionally, the swing mechanism further includes a self-resetting torsion spring, and the self-resetting torsion spring is installed on the reciprocating self-swinging shaft.

[0013] Optionally, the transmission mechanism includes a gear and a rack. The gear is fixed on the reciprocating self-swinging shaft, the rack meshes with the gear, and the lower end of the rack is fixed on the lower-layer movable filter screen.

[0014] Optionally, a guiding mechanism is further included, and the guiding mechanism is respectively connected to the lower-layer movable filter screen and the filter hopper cylinder.

[0015] Optionally, the guiding mechanism includes a spring, a guiding rod, and a guiding ring. The upper end of the guiding rod is fixed on the lower-layer movable filter screen, the guiding ring is fixed inside the filter hopper cylinder, the guiding rod is slidably arranged in the guiding ring, the spring is sleeved on the guiding rod, and the two ends of the spring are respectively connected to the lower-layer movable filter screen and the guiding ring.

[0016] Optionally, a connecting pipe is further included. The two ends of the connecting pipe are respectively connected to the water outlet at the bottom of the filter hopper cylinder and the water inlet of the motor pump body, and a control valve is arranged on the connecting pipe.

[0017] The technical solutions provided by the embodiments of the present invention may include the following beneficial effects: As can be seen from the above embodiments, when the motor pump body operates, the control valve is opened. The motor pump body first sucks the liquid into the filter hopper cylinder until the filter hopper cylinder is filled with liquid. After the work is completed, the control valve is closed. At this time, the filter hopper cylinder is always filled with liquid. Every time the centrifugal pump operates later, it can ensure that the inside of the centrifugal pump is in a vacuum state and filled with water to achieve the function of self-priming, ensuring the long-term use of the centrifugal pump.

[0018] The water entering the filter hopper cylinder will be filtered by the upper segmented filter screen and the lower movable filter screen to reduce the loss or wear of the impeller, avoid blockage and affect the use of the centrifugal pump, and at the same time can preliminarily purify the water source, greatly enriching the application scenarios.

[0019] When the water source enters the filter hopper cylinder, it will impact each upper segmented filter screen, causing it to swing downward. When the water flow rate is greater, the number of swings or the swing amplitude of the upper segmented filter screen increases, enabling the water source to be discharged according to the required flow rate and preventing the working efficiency of the centrifugal pump from being affected.

[0020] When the upper segmented filter screen swings, the lower movable filter screen is driven by the transmission mechanism to move upward, generating a small displacement to separate the sundries blocked thereon and prevent agglomeration blockage from affecting water permeability.

[0021] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings herein are incorporated into the specification and form a part of the specification, showing embodiments consistent with the present invention and used together with the specification to explain the principles of the present invention.

[0023] Figure 1 is a three-dimensional structure diagram of a self-priming centrifugal pump shown according to an exemplary embodiment.

[0024] Figure 2 is a schematic internal structure diagram of the filter hopper cylinder of a self-priming centrifugal pump shown according to an exemplary embodiment.

[0025] Figure 3 is Figure 2 an enlarged schematic view of part A in

[0026] Figure 4 is a top view of the mounting ring seat of a self-priming centrifugal pump shown according to an exemplary embodiment.

[0027] Figure 5 is Figure 2 an enlarged schematic view of part B in

[0028] The reference numerals in the figures are as follows: 1. Motor pump body; 2. Control valve; 3. Filter hopper cylinder; 31. Water inlet; 32. Water outlet; 33. Groove; 34. Notch; 35. Maintenance side cover; 36. Connecting flange; 4. Swing mechanism; 41. Mounting ring seat; 42. Reciprocating self-swinging shaft; 43. Connecting sector plate; 44. Self-resetting torsion spring; 5. Upper-layer segmented filter screen; 6. Lower-layer movable filter screen; 7. Transmission mechanism; 71. Gear; 72. Rack; 73. Limit block; 8. Guide mechanism; 81. Spring; 82. Guide rod; 83. Guide ring; 9. Connecting pipe. Detailed implementation manners

[0029] Here, the exemplary embodiments will be described in detail, and the examples are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementation manners described in the following exemplary embodiments do not represent all the implementation manners consistent with the present invention. On the contrary, they are only examples of the devices and methods consistent with some aspects of the present invention as detailed in the appended claims.

[0030] The terms used in the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The singular forms of "a", "the" and "said" used in the present invention and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term "and / or" as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0031] It should be understood that although the terms first, second, third, etc. may be used in the present invention to describe various information, such information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present invention, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the word "if" as used herein may be interpreted as "when" or "while" or "in response to a determination".

[0032] Refer to Figures 1 - 5, an embodiment of the present invention provides a self-priming centrifugal pump, which may include: a motor pump body 1, a control valve 2, a filter hopper 3, several swing mechanisms 4, an upper segmented filter screen 5, a lower movable filter screen 6, and a transmission mechanism 7; an inlet 31 is opened at the top of the filter hopper 3, and an outlet 32 is opened at the bottom. The outlet 32 is connected to the inlet of the motor pump body 1 through the control valve 2; several swing mechanisms 4 are installed in the filter hopper 3 in a circular array; an upper segmented filter screen 5 is installed on each swing mechanism 4, and when all the upper segmented filter screens 5 are closed, they form a complete surface; the lower movable filter screen 6 is arranged in the filter hopper 3 so as to be movable up and down and is located below the upper segmented filter screen 5; the transmission mechanism 7 connects the swing mechanism 4 and the lower movable filter screen 6, and when the upper segmented filter screen 5 swings downward, the lower movable filter screen 6 is lifted by the transmission mechanism 7.

[0033] Connect the inlet 31 at the top of the filter hopper 3 to an external water source delivery pipe. When the motor pump body 1 operates, the impeller in the motor pump body 1 rotates at a high speed, and water is thrown towards the outlet 32 of the motor pump body 1 under the action of the impeller. At the same time, a low-pressure area is formed at the inlet of the motor pump body 1, and the differential pressure causes the liquid to be sucked in. The liquid that does not enter the motor pump body 1 will be stored in the filter hopper 3, so that each time the centrifugal pump operates, the space inside the pump can be ensured to be in a vacuum state, and water can be automatically filled to achieve the self-priming function and ensure the long-term use of the centrifugal pump. The water entering the filter hopper 3 will be filtered by the upper segmented filter screen 5 and the lower movable filter screen 6 to reduce the loss or wear of the impeller, avoid blockage and affect the use of the centrifugal pump, and at the same time can perform preliminary purification treatment on the water source, greatly enriching the application places. When the water source enters the filter hopper 3, it will impact each upper segmented filter screen 5 and cause it to swing downward. When the water flow rate is greater, the number of swings or the swing amplitude of the upper segmented filter screen 5 increases, so that the water source can be discharged according to the required flow rate to avoid affecting the working efficiency of the centrifugal pump. At the same time, when the upper segmented filter screen 5 swings, the lower movable filter screen 6 is driven by the transmission mechanism 7 to move upward, causing a small displacement thereof to separate the sundries blocked thereon and avoid agglomeration blockage and affect the water permeability.

[0034] In one embodiment, several grooves 33 for installing the swing mechanism 4 are opened in the circumferential direction inside the filter hopper 3, and the grooves 33 are opened along the axial direction. The grooves 33 are used to install the swing mechanism 4 to reduce the gap between the swing mechanism 4 and the inner wall of the filter hopper 3.

[0035] In one embodiment, a notch 34 is formed at the lower layer of the side surface of the filtering hopper cylinder 3, and a maintenance side cover 35 is installed on the notch 34. The maintenance side cover 35 can repair and maintain the internal devices of the hopper cylinder and clean the sundries accumulated on the filter screen without disassembling the device, greatly simplifying the maintenance process of the device.

[0036] In one embodiment, a connecting flange 36 is installed at the water inlet 31 of the filtering hopper cylinder 3, which is convenient for connecting an external water pipe.

[0037] In one embodiment, the swinging mechanism 4 includes a mounting ring seat 41, a reciprocating self-swinging shaft 42, and an engaging sector plate 43. The mounting ring seat 41 is fixed on the inner wall of the filtering hopper cylinder 3, the engaging sector plate 43 is fixed on the reciprocating self-swinging shaft 42, the reciprocating self-swinging shaft 42 is pivotally connected to the mounting ring seat 41, and the upper-layer segmented filter screen 5 is fixed on the engaging sector plate 43. The impurities carried in the liquid can be filtered through the upper-layer segmented filter screen 5.

[0038] In one embodiment, the swinging mechanism 4 further includes a self-resetting torsion spring 44. The self-resetting torsion spring 44 is installed on the reciprocating self-swinging shaft 42, and the self-resetting torsion spring 44 plays an automatic resetting role for the upper-layer segmented filter screen 5.

[0039] In one embodiment, the transmission mechanism 7 includes a gear 71 and a rack 72. The gear 71 is fixed on the reciprocating self-swinging shaft 42, the rack 72 meshes with the gear 71, and the lower end of the rack 72 is fixed on the lower-layer movable filter screen 6. The transmission mechanism 7 can drive the lower-layer movable filter screen 6 to make a small displacement when the upper-layer segmented filter screen 5 is impacted by water flow, spreading the sundries accumulated on it to avoid agglomeration and blockage, which affects the water permeability.

[0040] When two of the upper-layer segmented filter screens 5 swing downward, they drive the rack 72 to move upward through the counterclockwise rotation of the gear 71. Then, the rack 72 drives the lower-layer movable filter screen 6 to move upward, generating a small displacement to spread the sundries blocked on it to avoid agglomeration and blockage, which affects the water permeability.

[0041] In addition, a limit block 73 can be installed on the rack 72 to control the lifting amplitude of the lower-layer movable filter screen 6, and also control the swinging amplitude of the swinging mechanism 4.

[0042] Exemplarily, if you want to control the lifting amplitude of the lower-layer movable filter screen 6 within 5 cm, limit blocks 73 can be installed at the positions 5 cm above and below the origin of the mounting ring seat 41 on the movable rack 72.

[0043] In one embodiment, it further includes a guiding mechanism 8, and the guiding mechanism 8 is respectively connected to the lower-layer movable filter screen 6 and the filter hopper cylinder 3. The guiding mechanism 8 plays the roles of connection, guiding, and automatic resetting. In one embodiment, the guiding mechanism 8 includes a spring 81, a guiding rod 82, and a guiding ring 83. The upper end of the guiding rod 82 is fixed on the lower-layer movable filter screen 6, the guiding ring 83 is fixed inside the filter hopper cylinder 3, the guiding rod 82 is slidably arranged in the guiding ring 83, the spring 81 is sleeved on the guiding rod 82, and the two ends are respectively connected to the lower-layer movable filter screen 6 and the guiding ring 83. The guiding mechanism 8 plays the roles of guiding and resetting for the guiding rod 82, and can automatically reset it to its initial position after the guiding rod 82 is lifted.

[0044] In one embodiment, it further includes a connecting pipe 9. The two ends of the connecting pipe 9 are respectively connected to the water outlet 32 at the bottom of the filter hopper cylinder 3 and the water inlet of the motor pump body 1, and the control valve 2 is arranged on the connecting pipe 9. The control valve 2 can control the flow rate of water entering the motor pump body 1.

[0045] Those skilled in the art will readily conceive of other embodiments of the present invention after considering the specification and practicing the content disclosed herein. The present invention is intended to cover any variations, uses, or adaptations of the present invention, which follow the general principles of the present invention and include the common general knowledge or conventional technical means in the technical field not disclosed by the present invention. The specification and embodiments are only regarded as exemplary, and the true scope and spirit of the present invention are pointed out by the claims.

[0046] It should be understood that the present invention is not limited to the exact structures described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present invention is only limited by the appended claims.

Claims

1. A self-priming centrifugal pump, characterized in that, Comprising: A motor pump body and a control valve; A filter hopper cylinder, having a water inlet at its top and a water outlet at its bottom, and the water outlet is connected to the water inlet of the motor pump body through the control valve; A plurality of swing mechanisms, which are installed in the filter hopper cylinder in an annular array; An upper-layer segmented filter screen, with one upper-layer segmented filter screen installed on each swing mechanism, and when all the upper-layer segmented filter screens are closed, they form a complete surface; A lower-layer movable filter screen, which is arranged in the filter hopper cylinder so as to be movable up and down and is located below the upper-layer segmented filter screen; A transmission mechanism, which connects the swing mechanism and the lower-layer movable filter screen, and when the upper-layer segmented filter screen swings downward, the lower-layer movable filter screen is lifted by the transmission mechanism.

2. The self-priming centrifugal pump according to claim 1, characterized in that, A plurality of grooves for installing the swing mechanisms are formed in the inner circumference of the filter hopper cylinder along the circumferential direction, and the grooves are formed along the axial direction.

3. The self-priming centrifugal pump according to claim 1, characterized in that, A notch is formed in the lower layer of the side surface of the filter hopper cylinder where the movable filter screen is located, and a maintenance side cover is installed on the notch.

4. The self-priming centrifugal pump according to claim 1, characterized in that, A connecting flange is installed at the water inlet of the filter hopper cylinder.

5. The self-priming centrifugal pump according to claim 1, wherein The swing mechanism includes a mounting ring seat, a reciprocating self-swinging shaft, and a connecting sector plate. The mounting ring seat is fixed on the inner wall of the filter hopper cylinder, the connecting sector plate is fixed on the reciprocating self-swinging shaft, the reciprocating self-swinging shaft is pivotally connected to the mounting ring seat, and the upper-layer segmented filter screen is fixed on the connecting sector plate.

6. The self-priming centrifugal pump according to claim 5, wherein, The swing mechanism further includes a self-resetting torsion spring, and the self-resetting torsion spring is installed on the reciprocating self-swinging shaft.

7. A self-priming centrifugal pump according to claim 5, characterized in that, The transmission mechanism includes a gear and a rack. The gear is fixed on the reciprocating self-swinging shaft, the rack meshes with the gear, and the lower end of the rack is fixed on the lower-layer movable filter screen.

8. A self-priming centrifugal pump according to claim 1, characterized in that, It further includes a guiding mechanism, and the guiding mechanism is respectively connected to the lower-layer movable filter screen and the filter hopper cylinder.

9. The self-priming centrifugal pump according to claim 8, characterized in that, The guiding mechanism includes a spring, a guiding rod, and a guiding ring. The upper end of the guiding rod is fixed on the lower-layer movable filter screen, the guiding ring is fixed in the filter hopper cylinder, the guiding rod is slidably arranged in the guiding ring, the spring is sleeved on the guiding rod, and the two ends of the spring are respectively connected to the lower-layer movable filter screen and the guiding ring.

10. The self-priming centrifugal pump according to claim 1, characterized in that, It further includes a connecting pipe, and the two ends of the connecting pipe are respectively connected to the water outlet at the bottom of the filter hopper cylinder and the water inlet of the motor pump body, and the control valve is arranged on the connecting pipe.

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