A self-priming centrifugal pump

Abstract

The present invention belongs to the technical field of centrifugal pumps and discloses a self-priming centrifugal pump, comprising: a motor pump body and a control valve; a filter bucket having a water inlet at the top and a water outlet at the bottom, the water outlet being connected to the water inlet of the motor pump body through a control valve; a plurality of swing mechanisms arranged in a circular array in the filter bucket; an upper layer of segmented filter screen, each swing mechanism being equipped with an upper layer of segmented filter screen; a lower layer of movable filter screen arranged in the filter bucket so as to be movable up and down and located below the upper layer of segmented filter screen; a transmission mechanism connecting the swing mechanism and the lower layer of movable filter screen, and when the upper layer of segmented filter screen swings down, the lower layer of movable filter screen is lifted by the transmission mechanism. After the water source enters the filter bucket, it impacts the upper layer of segmented filter screen to cause it to swing. When the flow rate increases, the number or amplitude of the filter screen swings increases, and the drainage is adjusted as needed to avoid affecting the efficiency of the centrifugal pump; at the same time, the lower layer of filter screen is slightly displaced accordingly, dispersing debris to avoid blockage and maintaining the hydrophobic performance.

Description

Technical Field

[0001] The present 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 a 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:

[0004] 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 of water, and cannot fully realize the self-filling function.

[0005] The other method 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 preliminarily filtered when tanking water. If a lot of debris is involved, it will affect the working condition of the centrifugal pump or even damage it.

[0006] With the increasing demand for high efficiency and energy saving in scenarios such as smart water services and precision irrigation, filtration and flow regulation are also crucial. Traditional filtration and flow regulation systems usually adopt a separate design, that is, the filtration device and flow control valve operate independently, which leads to the following technical bottlenecks:

[0007] Additional valves, pump groups or electronic controllers are required to achieve flow regulation, resulting in bulky equipment and increased installation and maintenance costs; traditional fixed filter layers are easily clogged due to impurity accumulation, increasing water flow resistance and causing 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 and precise control of small flow rates. Summary of the Invention

[0008] The purpose of the embodiments 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 in the related art.

[0009] According to an embodiment of the present invention, there is provided a self-priming centrifugal pump, comprising:

[0010] Motor pump body and control valve;

[0011] The filter bucket has a water inlet on the top and a water outlet on the bottom, and the water outlet is connected to the water inlet of the motor pump body through the control valve;

[0012] A plurality of swing mechanisms are installed in a circular array in the filter barrel;

[0013] An upper layer segmented filter screen is installed on each of the swing mechanisms, and all the upper layer segmented filter screens form a complete surface when closed;

[0014] The lower movable filter is arranged in the filter bucket and can be moved up and down, and is located below the upper segmented filter;

[0015] A transmission mechanism is provided, wherein the transmission mechanism connects the swing mechanism and the lower movable filter screen. When the upper segmented filter screen swings downward, the lower movable filter screen is lifted by the transmission mechanism.

[0016] Optionally, a plurality of grooves for installing the swing mechanism are provided inside the filter tube along the circumferential direction, and the grooves are provided along the axial direction.

[0017] Optionally, a gap is provided at the lower movable filter screen on the side of the filter bucket, and a maintenance side cover is installed on the gap.

[0018] Optionally, a connecting flange is installed at the water inlet of the filter bucket.

[0019] Optionally, the swing mechanism includes a mounting ring seat, a reciprocating self-swinging shaft, and a connecting fan-shaped plate. The mounting ring seat is fixed to the inner wall of the filter bucket, the connecting fan-shaped plate is fixed to the reciprocating self-swinging shaft, the reciprocating self-swinging shaft is pivotally connected to the mounting ring seat, and the upper layer segmented filter is fixed to the connecting fan-shaped plate.

[0020] Optionally, the swing mechanism further includes a self-resetting torsion spring, and the self-resetting torsion spring is mounted on the reciprocating self-swinging shaft.

[0021] Optionally, the transmission mechanism includes a gear and a rack, the gear is fixed on the reciprocating self-oscillating shaft, the rack is engaged with the gear, and the lower end of the rack is fixed on the lower movable filter screen.

[0022] Optionally, a guide mechanism is further included, wherein the guide mechanism is respectively connected to the lower movable filter screen and the filter bucket.

[0023] Optionally, the guide mechanism includes a spring, a guide rod and a guide ring, the upper end of the guide rod is fixed on the lower movable filter screen, the guide ring is fixed in the filter bucket, the guide rod is slidably arranged in the guide ring, the spring sleeve is arranged on the guide rod, and the two ends are respectively connected to the lower movable filter screen and the guide ring.

[0024] Optionally, a connecting pipe is further included, the two ends of which are respectively connected to the water outlet at the bottom of the filter bucket and the water inlet of the motor pump body, and the control valve is arranged on the connecting pipe.

[0025] The technical solutions provided by the embodiments of the present invention may have the following beneficial effects:

[0026] As can be seen from the above embodiment, when the motor pump body is working and the control valve is opened, the motor pump body first sucks the liquid into the filter bucket, so that the filter bucket is filled with liquid. After the work is completed, the control valve is closed. At this time, the filter bucket is always filled with liquid. Each time the centrifugal pump works thereafter, it can ensure that the inside of the centrifugal pump is in a vacuum state and water is poured in to achieve a self-priming function, thereby ensuring the long-term use of the centrifugal pump.

[0027] The water entering the filter bucket will be filtered by the upper segmented filter and the lower movable filter to reduce the loss or wear of the impeller, avoid blockage and affect the use of the centrifugal pump, and at the same time perform preliminary purification of the water source, greatly enriching the application sites.

[0028] When water enters the filter bucket, it will impact the upper segmented filter screens, causing them to swing downward. When the water flow rate increases, the upper segmented filter screens will swing more or more, so that the water source can be discharged according to the required flow rate, avoiding affecting the working efficiency of the centrifugal pump.

[0029] When the upper layer of the segmented filter screen swings, the transmission mechanism drives the lower layer of the movable filter screen to move upward, causing it to produce a small displacement, so as to spread out the debris blocking it and avoid accumulation and blockage that affects water permeability.

[0030] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0032] Figure 1 It is a structural stereogram of a self-priming centrifugal pump according to an exemplary embodiment.

[0033] Figure 2 The figure is a schematic diagram of the internal structure of the filter bucket of a self-priming centrifugal pump according to an exemplary embodiment.

[0034] Figure 3 yes Figure 2 Enlarged schematic diagram of point A in the middle.

[0035] Figure 4 FIG. 1 is a top view of a mounting ring seat of a self-priming centrifugal pump according to an exemplary embodiment.

[0036] Figure 5 yes Figure 2 Enlarged schematic diagram of point B in the middle.

[0037] The reference numerals in the figures are:

[0038] 1. Motor pump body;

[0039] 2. Control valve;

[0040] 3. Filter bucket; 31. Water inlet; 32. Water outlet; 33. Groove; 34. Notch; 35. Maintenance side cover; 36. Connecting flange;

[0041] 4. Swing mechanism; 41. Mounting ring seat; 42. Reciprocating self-swinging shaft; 43. Connecting fan-shaped plate; 44. Self-resetting torsion spring;

[0042] 5. Upper layer filter screen;

[0043] 6. Lower movable filter;

[0044] 7. Transmission mechanism; 71. Gear; 72. Rack; 73. Limit block;

[0045] 8. Guide mechanism; 81. Spring; 82. Guide rod; 83. Guide ring;

[0046] 9. Connecting pipe. DETAILED DESCRIPTION

[0047] Exemplary embodiments will be described in detail herein, examples of which are illustrated in the accompanying drawings. In the following description, when referring to the drawings, like numbers in different figures represent like or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all possible embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present invention, as detailed in the appended claims.

[0048] The terms used in this invention are for the purpose of describing specific embodiments only and are not intended to limit the invention. The singular forms "a," "the," and "the" used in this invention and the appended claims are also intended to include 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.

[0049] 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 merely used to distinguish information of the same type from one another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present invention. Depending on the context, the term "if" as used herein may be interpreted as "when," "when," or "in response to determining."

[0050] refer to Figure 1-Figure 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 bucket 3, a plurality of swinging mechanisms 4, an upper layer segmented filter screen 5, a lower layer movable filter screen 6, and a transmission mechanism 7; the filter bucket 3 is provided with a water inlet 31 at the top and a water outlet 32 ​​at the bottom, the water outlet 32 ​​being connected to the water inlet of the motor pump body 1 through the control valve 2; a plurality of swinging mechanisms 4 are installed in the filter bucket 3 in a circular array; each of the swinging mechanisms 4 is provided with an upper layer segmented filter screen 5, and all the upper layer segmented filter screens 5 form a complete surface when closed; the lower layer movable filter screen 6 is movably arranged in the filter bucket 3 and is located below the upper layer segmented filter screen 5; the transmission mechanism 7 connects the swinging mechanism 4 and the lower layer movable filter screen 6, and when the upper layer segmented filter screen 5 swings down, the lower layer movable filter screen 6 is lifted by the transmission mechanism 7.

[0051] Connect the water inlet 31 at the top of the filter bucket 3 to the external water supply pipe, and the motor pump body 1 starts working. The impeller in the motor pump body 1 rotates at high speed, and the water is thrown to the water 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 water inlet of the motor pump body 1. The differential pressure causes the liquid to be sucked in, and the liquid that does not enter the motor pump body 1 will be stored in the filter bucket 3. Each time the centrifugal pump is working, the space inside the pump can be guaranteed to be in a vacuum state, and water can be automatically filled in to achieve a self-priming function, thereby ensuring the long-term use of the centrifugal pump;

[0052] The water entering the filter bucket 3 will be filtered by the upper layer of the segmented filter 5 and the lower layer of the movable filter 6 to reduce the loss or wear of the impeller and avoid blockage that affects the use of the centrifugal pump. At the same time, it can perform preliminary purification on the water source, greatly enriching the application sites;

[0053] When water enters the filter bucket 3, it impacts the upper segmented screens 5, causing them to swing downward. As the water flow increases, the upper segmented screens 5 swing more frequently or with greater amplitude, allowing water to be discharged at the required flow rate without affecting the efficiency of the centrifugal pump. Simultaneously, as the upper segmented screens 5 swing, the transmission mechanism 7 drives the lower movable screen 6 upward, causing it to move slightly upward, distributing any debris trapped above it and preventing accumulation and blockage that could affect water flow.

[0054] In one embodiment, the filter drum 3 has a plurality of grooves 33 along the circumferential direction for mounting the swing mechanism 4. The grooves 33 are formed along the axial direction. The grooves 33 are used to mount the swing mechanism 4 and reduce the gap between the swing mechanism 4 and the inner wall of the filter drum 3.

[0055] In one embodiment, a notch 34 is formed on the side of the filter drum 3 at the lower movable filter screen 6, and a maintenance cover 35 is installed on the notch 34. The maintenance cover 35 allows for repair and maintenance of the internal components of the drum and for cleaning debris accumulated on the filter screen without disassembling the device, significantly simplifying the maintenance process of the device.

[0056] In one embodiment, a connecting flange 36 is installed at the water inlet 31 of the filter drum 3 to facilitate connection to an external water pipe.

[0057] In one embodiment, the swing mechanism 4 includes a mounting ring seat 41, a reciprocating self-swinging shaft 42, and a connecting fan-shaped plate 43. The mounting ring seat 41 is fixed to the inner wall of the filter tube 3, the connecting fan-shaped 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 connecting fan-shaped plate 43. Impurities carried in the liquid can be filtered through the upper layer segmented filter screen 5.

[0058] In one embodiment, the swing mechanism 4 further includes a self-resetting torsion spring 44 , which is mounted on the reciprocating self-swinging shaft 42 . The self-resetting torsion spring 44 automatically resets the upper layer segmented filter 5 .

[0059] In one embodiment, the transmission mechanism 7 includes a gear 71 and a rack 72. The gear 71 is fixed to the reciprocating self-oscillating shaft 42, and the rack 72 meshes with the gear 71. The lower end of the rack 72 is fixed to the lower movable filter screen 6. The transmission mechanism 7 can drive the lower movable filter screen 6 to slightly move when water flows into the upper segmented filter screen 5, dispersing debris accumulated thereon and preventing accumulation and blockage that could affect water flow.

[0060] When two of the upper segmented filter screens 5 swing downward, they rotate counterclockwise through the gear 71 to drive the rack 72 to move upward, and then the rack 72 drives the lower movable filter screen 6 to move upward, causing it to produce a small displacement to distribute and separate the debris blocked on it, avoiding accumulation and blockage that affects water permeability.

[0061] In addition, a limit block 73 can be installed on the rack 72 to control the lifting range of the lower movable filter 6 and the swing range of the swing mechanism 4.

[0062] For example, if one wishes to control the lifting range of the lower movable filter screen 6 within 5 cm, a limit block 73 may be installed at a position 5 cm upward and downward of the movable rack 72 with the mounting ring seat 41 as the origin.

[0063] In one embodiment, a guide mechanism 8 is further included, which connects the lower movable filter screen 6 and the filter bucket 3. The guide mechanism 8 plays the role of connection, guidance and automatic reset.

[0064] In one embodiment, the guide mechanism 8 includes a spring 81, a guide rod 82, and a guide ring 83. The upper end of the guide rod 82 is fixed to the lower movable filter 6, and the guide ring 83 is fixed within the filter barrel 3. The guide rod 82 is slidably disposed within the guide ring 83. The spring 81 is sleeved on the guide rod 82, with its ends respectively connected to the lower movable filter 6 and the guide ring 83. The guide mechanism 8 guides and resets the guide rod 82. After the guide rod 82 is raised, it automatically resets to its initial position.

[0065] In one embodiment, a connecting pipe 9 is further included, the two ends of which are respectively connected to the water outlet 32 ​​at the bottom of the filter bucket 3 and the water inlet of the motor pump body 1. The control valve 2 is provided on the connecting pipe 9. The control valve 2 can control the flow rate of water entering the motor pump body 1.

[0066] Other embodiments of the present invention will readily occur to those skilled in the art after considering the specification and practicing the disclosure herein. The present invention is intended to cover any variations, uses, or adaptations of the present invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered as exemplary only, with the true scope and spirit of the invention being indicated by the claims.

[0067] It should be understood that the present invention is not limited to the exact construction described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A self-priming centrifugal pump, characterized in that: include: Motor pump body and control valve; The filter bucket has a water inlet on the top and a water outlet on the 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 are installed in a circular array in the filter barrel; An upper layer segmented filter screen is installed on each of the swing mechanisms, and all the upper layer segmented filter screens form a complete surface when closed; The lower movable filter is arranged in the filter bucket and can be moved up and down, and is located below the upper segmented filter; a transmission mechanism connecting the swing mechanism and the lower movable filter screen, wherein when the upper segmented filter screen swings downward, the lower movable filter screen is lifted by the transmission mechanism; The swing mechanism includes a mounting ring seat, a reciprocating self-swinging shaft, and a connecting sector plate. The mounting ring seat is fixed to the inner wall of the filter bucket, the connecting sector plate is fixed to 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 to the connecting sector plate. The swing mechanism further comprises a self-resetting torsion spring, which is mounted on the reciprocating self-swinging shaft.

2. A self-priming centrifugal pump according to claim 1, characterized in that: A plurality of grooves for installing the swing mechanism are provided inside the filter barrel along the circumferential direction, and the grooves are provided along the axial direction.

3. A self-priming centrifugal pump according to claim 1, characterized in that: A gap is provided at the lower movable filter screen on the side of the filter bucket, and a maintenance side cover is installed on the gap.

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

5. A self-priming centrifugal pump according to claim 1, characterized in that: The transmission mechanism includes a gear and a rack, the gear is fixed on the reciprocating self-oscillating shaft, the rack is engaged with the gear, and the lower end of the rack is fixed on the lower movable filter screen.

6. A self-priming centrifugal pump according to claim 1, characterized in that: It also includes a guide mechanism, which is respectively connected to the lower movable filter screen and the filter bucket.

7. A self-priming centrifugal pump according to claim 6, characterized in that: The guide mechanism includes a spring, a guide rod and a guide ring. The upper end of the guide rod is fixed on the lower movable filter screen, and the guide ring is fixed in the filter bucket. The guide rod is slidably arranged in the guide ring. The spring is sleeved on the guide rod, and the two ends are respectively connected to the lower movable filter screen and the guide ring.

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

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