Low-resistance impeller structure high-efficiency energy-saving centrifugal pump

Abstract

The application discloses a low-flow-resistance impeller structure high-efficiency energy-saving centrifugal pump, and relates to the technical field of centrifugal pumps, which comprises a pump body, a pump shaft and an impeller. The pump body is provided with an inlet and an outlet. The pump shaft is rotatably arranged in the pump body. The impeller is arranged in the pump body and is connected to the pump shaft. The impeller comprises a front cover plate and a rear cover plate which are oppositely arranged along the axial direction of the pump shaft, and a plurality of main blades which are connected between the front cover plate and the rear cover plate. A main flow channel extending from the center of the impeller to the outer periphery is formed between two adjacent main blades. The front cover plate is provided with a front cover plate flow guide rib which protrudes towards the rear cover plate. The rear cover plate is provided with a rear cover plate flow guide rib which protrudes towards the front cover plate. The two kinds of flow guide ribs are staggered in the front-rear direction of the liquid flow and partially overlap in the axial projection, so that the front-rear flow guide ribs are connected to each other in the extension direction of the main flow channel, and the flow mutation of the liquid flow when entering from one flow guide area to another flow guide area is reduced.

Description

Technical Field

[0001] This invention relates to the field of centrifugal pump technology, specifically to a high-efficiency and energy-saving centrifugal pump with a low-flow-resistance impeller structure. Background Technology

[0002] Centrifugal pumps work on liquids by rotating impellers, causing the liquids to move from the center of the impeller to the outer periphery and then be discharged after being collected in the pump body. The flow state in the main flow channel of the impeller directly affects the head, hydraulic efficiency and operating energy consumption of the centrifugal pump.

[0003] The main blades of the closed impeller are connected between the front and rear cover plates. When the liquid flows through the curved main channel, the liquid near the two side cover plates is easily affected by the combined effects of wall friction, channel curvature and pressure gradient changes, forming a low-speed zone, secondary flow or local separation, resulting in uneven velocity distribution at the outlet of the main channel and additional hydraulic losses.

[0004] Adding additional blades that penetrate the front and rear cover plates in the main flow channel can guide the liquid, but the through structure will increase the physical blockage of the main flow channel and the liquid contact area. Its inlet and outlet ends may also cause new impacts or eddy losses. Therefore, it is necessary to improve the liquid flow near the cover plate while retaining the continuous flow space of the liquid flow in the axial middle.

[0005] To address this issue, we propose a high-efficiency, energy-saving centrifugal pump with a low-flow-resistance impeller structure. Summary of the Invention

[0006] In view of this, and in view of the shortcomings of the prior art, the present invention provides a high-efficiency and energy-saving centrifugal pump with a low flow resistance impeller structure to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: A low-flow-resistance impeller structure high-efficiency energy-saving centrifugal pump includes a pump body, a pump shaft, and an impeller. The pump body has an inlet and an outlet. The pump shaft rotatably extends into the pump body. The impeller is located inside the pump body and mounted on the pump shaft. The impeller includes a front cover plate and a rear cover plate arranged axially opposite to each other along the pump shaft, and multiple main blades connected between the front cover plate and the rear cover plate. A main flow channel extending from the center of the impeller to the outer periphery is formed between two adjacent main blades. Each main flow channel is provided with a front cover plate for flow guidance. The front and rear cover plate guide ribs protrude from the front cover plate toward the rear cover plate, and the rear cover plate guide rib protrude from the rear cover plate toward the front cover plate. The front and rear cover plate guide ribs are staggered along the direction of liquid flow from the center of the impeller to the outer periphery and partially overlap in the projection along the pump shaft axis. The free ends of the front and rear cover plate guide ribs are spaced apart along the pump shaft axis and do not contact each other at any position. A central continuous channel is formed between them, which extends continuously along the connection area of ​​the two guide ribs and is connected to the main channel.

[0008] Preferably, multiple main blades are distributed at intervals along the circumference of the impeller, and a front cover plate guide rib and a rear cover plate guide rib are respectively provided in each main channel. The front cover plate guide rib and the rear cover plate guide rib in the same main channel are paired and matched.

[0009] Preferably, the front cover plate guide ribs include, in sequence along the liquid flow direction, a continuously formed front rib inlet section, a front rib gradual transition section, and a front rib outlet section, and the rear cover plate guide ribs include, in sequence along the liquid flow direction, a continuously formed rear rib inlet section, a rear rib gradual transition section, and a rear rib outlet section.

[0010] Preferably, the front rib inlet section, the front rib gradual transition section, and the front rib outlet section together form a continuous front guide surface, and the rear rib inlet section, the rear rib gradual transition section, and the rear rib outlet section together form a continuous rear guide surface, with smooth transitions between adjacent sections.

[0011] Preferably, both the front cover plate guide rib and the rear cover plate guide rib extend along the corresponding main channel in a curved manner, and the front cover plate guide rib and the rear cover plate guide rib are respectively spaced apart from the two main blades that define the corresponding main channel.

[0012] Preferably, one of the front cover plate guide rib and the rear cover plate guide rib is located upstream of the other, and the portion of the upstream guide rib near the outlet side of the main channel partially overlaps with the portion of the downstream guide rib near the inlet side of the main channel along the pump shaft axial projection.

[0013] Preferably, the main blade is connected to the front cover plate and the rear cover plate along the axial direction. The guide ribs of the front cover plate and the guide ribs of the rear cover plate each occupy only part of the axial space between the front cover plate and the rear cover plate. The central continuous channel remains connected in the overlapping area of ​​the axial projection of the two guide ribs.

[0014] Preferably, the front cover plate has an impeller inlet ring at its center, which is opposite to the water inlet and connected to the inlet side of each main channel. The outlet side of each main channel is connected to the collection space inside the pump body, and the collection space is connected to the water outlet.

[0015] Preferably, the centrifugal pump further includes a bearing housing and a pump cover, the pump cover being installed on one side of the pump body, and the pump shaft passing through the pump cover and rotatably supported in the bearing housing.

[0016] Preferably, the centrifugal pump further includes a base, a drive motor, and a transmission protective sleeve. The drive motor, bearing housing, and pump body are mounted on the base. The output end of the drive motor is connected to the pump shaft for transmission. The transmission protective sleeve is located outside the transmission area between the drive motor and the bearing housing.

[0017] Compared with the prior art, the present invention provides a high-efficiency and energy-saving centrifugal pump with a low flow resistance impeller structure, which has the following beneficial effects: By making the front cover plate guide ribs and the rear cover plate guide ribs protrude from the opposite cover plates into the main channel, the liquid near the front cover plate and the rear cover plate can be guided respectively, reducing the possibility of low-velocity zones, secondary flows and local separation in the vicinity of the cover plates.

[0018] By misaligning the two types of guide ribs along the direction of liquid flow and partially overlapping them in the axial projection, the guiding effects on the front and rear sides can be connected in the direction of the main channel extension, reducing the abrupt flow changes when the liquid flows from one guide region to another.

[0019] By axially spacing the free ends of the two types of guide ribs without contacting each other, and forming a continuous central channel between them, the continuous flow space of the liquid flow in the central part of the axial direction can be preserved while improving the liquid flow near the cover plate, reducing the hydraulic loss caused by physical blockage and additional contact area.

[0020] By ensuring that the inlet section, gradual transition section and outlet section of each guide rib are continuously formed and smoothly transitioned, the local impact generated when the liquid enters and leaves the guide rib can be reduced, making the liquid flow distribution at the outlet of the main channel more uniform. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the centrifugal pump of the present invention from a first-view perspective.

[0022] Figure 2 This is a schematic diagram of the overall structure of the centrifugal pump of the present invention from a second perspective.

[0023] Figure 3 This is a schematic diagram of the pump body of the present invention in a partially cut-open state.

[0024] Figure 4 This is a schematic diagram of the impeller mounting area of ​​the present invention.

[0025] Figure 5 This is a three-dimensional structural diagram of the impeller of the present invention.

[0026] Figure 6 This is a schematic diagram of the lateral structure of the impeller of the present invention.

[0027] Figure 7 This is a first structural schematic diagram of the front cover and rear cover of the present invention in a separated state.

[0028] Figure 8 This is a schematic diagram of the second structure of the present invention with the front cover plate and the rear cover plate separated.

[0029] Figure 9 This is a three-dimensional schematic diagram of the internal flow guiding structure of the main channel of the present invention.

[0030] Figure 10 This is an axial schematic diagram of the internal flow guiding structure of the main channel of the present invention.

[0031] In the diagram: 1. Base; 2. Drive motor; 3. Transmission protective sleeve; 5. Bearing housing; 6. Pump shaft; 7. Pump cover; 8. Pump body; 9. Outlet; 10. Inlet; 11. Impeller; 111. Impeller inlet ring; 112. Front cover plate; 113. Rear cover plate; 114. Main blades; 115. Front cover plate guide ribs; 1151. Front rib inlet section; 1152. Front rib gradual transition section; 1153. Front rib outlet section; 116. Rear cover plate guide ribs; 1161. Rear rib inlet section; 1162. Rear rib gradual transition section; 1163. Rear rib outlet section; 117. Central continuous channel. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Embodiments of the present invention like Figures 1 to 4 As shown, a low-flow-resistance impeller structure high-efficiency and energy-saving centrifugal pump includes a base 1, a drive motor 2, a transmission protective cylinder 3, a bearing housing 5, a pump shaft 6, a pump cover 7, a pump body 8, and an impeller 11 disposed in the pump body 8. The base 1 forms the mounting foundation of the whole machine. The drive motor 2, the bearing housing 5, and the pump body 8 are fixed on the base 1 in sequence along the transmission direction, so that the output end of the drive motor 2, the pump shaft 6, and the impeller 11 are kept coaxially arranged.

[0034] The transmission protective cylinder 3 is set between the drive motor 2 and the bearing housing 5 and surrounds the outside of the transmission part. Its two ends are respectively connected to the corresponding installation parts to isolate the rotating transmission components and prevent foreign objects from entering the transmission area. The transmission protective cylinder 3 can adopt a detachable cylinder structure to facilitate the installation, inspection and maintenance of the internal coupling components.

[0035] The bearing housing 5 is equipped with a bearing assembly for supporting the pump shaft 6. One end of the pump shaft 6 is connected to the output end of the drive motor 2, and the other end of the pump shaft 6 passes through the pump cover 7 and extends into the pump body 8. The bearing assembly provides radial support and axial positioning for the pump shaft 6, so that the impeller 11 can rotate stably within the pump body 8.

[0036] The pump cover 7 is connected to the side of the pump body 8 near the bearing housing 5 and closes the corresponding opening of the pump body 8. A shaft seal assembly is installed at the position where the pump shaft 6 passes through the pump cover 7. The shaft seal assembly can be a mechanical seal or a packing seal depending on the conveying medium and working pressure, and is used to limit the leakage of liquid in the pump body 8 outward along the pump shaft 6.

[0037] Impeller 11 is mounted on pump shaft 6 that extends into pump body 8. Impeller 11 and pump shaft 6 can be connected by key to transmit torque and are axially limited by shaft end fasteners. When drive motor 2 is running, it drives pump shaft 6 and impeller 11 to rotate synchronously through transmission connection. In the form of pump head without drive motor 2, torque can also be input to pump shaft 6 by external prime mover.

[0038] The pump body 8 has an inlet 10 arranged along the axis of the pump shaft 6 and an outlet 9 connected to the internal flow collection space of the pump body 8. The inlet 10 is opposite to the inlet area of ​​the impeller 11, and the outlet 9 is located on the radial outer side of the pump body 8, thereby forming a liquid transport path that enters from the inlet 10, is energized by the impeller 11, and is discharged from the outlet 9.

[0039] like Figures 5 to 8 As shown, the impeller 11 includes an impeller inlet ring 111, a front cover plate 112, a rear cover plate 113, and multiple main blades 114. The impeller inlet ring 111 is located at the center inlet of the front cover plate 112 and is coaxially connected to the water inlet 10. The front cover plate 112 and the rear cover plate 113 are arranged relatively spaced apart along the axial direction. The multiple main blades 114 are distributed circumferentially between the front cover plate 112 and the rear cover plate 113.

[0040] Two adjacent main blades 114 together with the front cover plate 112 and the rear cover plate 113 form a main channel from the center side of the impeller to the outer periphery side of the impeller. The inlet of each main channel is connected to the impeller inlet ring 111, and the outlet of each main channel is connected to the collection space of the pump body 8. When the impeller 11 rotates, the main blades 114 do work on the liquid entering the main channel.

[0041] Each main channel is provided with a set of cooperating front cover plate guide ribs 115 and rear cover plate guide ribs 116. The front cover plate guide ribs 115 protrude from the inner surface of the front cover plate 112 toward the rear cover plate 113, and the rear cover plate guide ribs 116 protrude from the inner surface of the rear cover plate 113 toward the front cover plate 112. The two respectively occupy a part of the axial height of the main channel.

[0042] Both the front cover plate guide rib 115 and the rear cover plate guide rib 116 extend in a curved direction along the general direction of the liquid flowing from the center side of the impeller to the outer periphery side of the impeller. Their extension trend is adapted to the streamline direction of the main channel and they are spaced apart from the adjacent main blades 114 to avoid dividing the main channel into independent small channels that are closed to each other.

[0043] The front cover guide rib 115 continuously forms a front rib inlet section 1151, a front rib gradual transition section 1152, and a front rib outlet section 1153 along its own extension direction. The front rib inlet section 1151, the front rib gradual transition section 1152, and the front rib outlet section 1153 are connected in sequence to form the same continuous rib. There are no gaps or breaks between the three sections that would disconnect the front cover guide rib 115.

[0044] The front rib inlet section 1151 is used to receive the liquid flowing from the upstream area. The front rib gradual transition section 1152 gradually adjusts the liquid flow by continuously changing the bending direction, cross-sectional size or protrusion height. The front rib outlet section 1153 guides the adjusted liquid to the outer peripheral outlet area of ​​the main channel.

[0045] The rear cover guide rib 116 extends continuously along its own direction to form a rear rib inlet section 1161, a rear rib gradual transition section 1162, and a rear rib outlet section 1163. The rear rib inlet section 1161, the rear rib gradual transition section 1162, and the rear rib outlet section 1163 are connected in sequence to form the same continuous rib. There are no gaps or breaks between the three sections that would cause the rear cover guide rib 116 to break.

[0046] The rear rib inlet section 1161 is used to receive liquid entering the corresponding main channel from the center side of the impeller. The rear rib gradual transition section 1162 continuously guides the liquid flow direction. The rear rib outlet section 1163 makes the liquid maintain a downstream flow trend when leaving the rear cover plate guide rib 116, and forms a continuous guide with the front cover plate guide rib 115 located downstream of it.

[0047] Both the front rib gradual transition section 1152 and the rear rib gradual transition section 1162 adopt smooth and continuous guide surfaces. They do not form steps that block the flow between them and the adjacent inlet and outlet sections. The specific curvature, length, thickness and protrusion height can be determined according to the impeller diameter, main channel width, design flow rate and design head, so that the change of the guide surface direction is adapted to the flow direction of the liquid in the area.

[0048] like Figure 9 and Figure 10 As shown, in this embodiment, the rear cover plate guide rib 116 is located upstream of the front cover plate guide rib 115, which extends from the center side of the impeller to the outer periphery side of the impeller. The front cover plate guide rib 115 is located downstream of the rear cover plate guide rib 116. The rear rib outlet section 1163 extends toward the front rib inlet section 1151, thereby causing the two guide ribs to be misaligned along the flow direction and not terminate and start at the same position.

[0049] At least a portion of the rear rib exit section 1163 and at least a portion of the front rib inlet section 1151 overlap each other when viewed along the impeller axis, thereby forming a partial overlap of the front cover guide rib 115 and the rear cover guide rib 116 in the axial projection, the partial overlap being used to allow the downstream guide to begin before the upstream guide has fully ended.

[0050] The partial overlap in the axial projection only indicates that the two guide ribs have a common coverage area in the projection plane perpendicular to the impeller axis. The free ends of the front cover plate guide rib 115 and the rear cover plate guide rib 116 are always axially spaced from each other in the solid structure and do not contact each other at any position. Both are fixed to the impeller 11 and rotate synchronously with the impeller 11. Therefore, this axial spacing is used to retain the space through which the liquid passes rather than as a movement gap between two relatively rotating parts.

[0051] The main blade 114 extends from the front cover plate 112 to the rear cover plate 113 and crosses the axial height of the main flow channel. The front cover plate guide rib 115 and the rear cover plate guide rib 116 each occupy only a part of this axial height. At the position where the projections of the two overlap, when the axial distance between the relative inner surfaces of the front cover plate 112 and the rear cover plate 113 is B, the protrusion height of the front cover plate guide rib 115 is h1, and the protrusion height of the rear cover plate guide rib 116 is h2, the three satisfy that B is greater than the sum of h1 and h2.

[0052] The actual axial clearance between the front cover plate guide rib 115 and the rear cover plate guide rib 116 is B minus the sum of h1 and h2. This clearance remains positive at all relative positions of the two guide ribs. Its minimum value should be able to maintain flow even after taking into account impeller forming error, assembly error and elastic deformation of the cover plate and guide rib caused by operating load, so as to prevent the two free ends from contacting or closing the flow space.

[0053] The central continuous channel 117 located between the two guide ribs is a spatial channel defined by the free end of the front cover guide rib 115, the free end of the rear cover guide rib 116, and the axial interval between them. The central continuous channel 117 is connected along the junction area of ​​the two guide ribs and is connected to the upstream and downstream areas of the main channel, rather than being a separate solid component installed in the impeller 11.

[0054] The front cover guide rib 115 can be integrally formed with the front cover 112, and the rear cover guide rib 116 can be integrally formed with the rear cover 113. Alternatively, they can be processed separately and fixed to the corresponding cover plates, provided that the root connection strength and the continuity of the guide surface are guaranteed. When using separate manufacturing, the connection parts should be smoothed to avoid abrupt protrusions in the main channel.

[0055] When assembling the impeller 11, first ensure the relative positions of the front cover plate 112, the rear cover plate 113 and the main blade 114, then check that the rear cover plate guide rib 116 is located upstream, the front cover plate guide rib 115 is located downstream, the rear rib outlet section 1163 and the front rib inlet section 1151 have axial projection overlap, and a positive axial clearance is always maintained between the two free ends. Check whether the central continuous channel 117 is continuous and unobstructed from the impeller center side to the impeller outer circumference side.

[0056] After the centrifugal pump is started, the drive motor 2 drives the pump shaft 6 to rotate and drives the impeller 11 to rotate. Under the suction action of the impeller 11, the liquid enters the central area of ​​the impeller 11 through the inlet 10 and the impeller inlet ring 111, and is then distributed to each main channel defined by the adjacent main blades 114.

[0057] When the liquid moves from the center side of the impeller to the outer periphery side under the action of the main blade 114, it first flows through the guide rib 116 of the rear cover plate located upstream. The rear rib inlet section 1161 receives the inlet liquid flow, the rear rib gradual transition section 1162 gradually adjusts the direction of the liquid flow, and the rear rib outlet section 1163 guides the liquid flow to the downstream continuation area.

[0058] After the liquid leaves the rear rib outlet section 1163 and enters the axial projection overlap area, part of the liquid continues to move along the guide surface of the rear cover guide rib 116, while another part of the liquid passes through the central continuous channel 117 between the two guide ribs and is received by the downstream front rib inlet section 1151. Thus, the liquid flow can complete the transition from the rear cover side guide to the front cover side without being blocked by the solid rib.

[0059] The liquid entering the working area of ​​the front cover guide rib 115 passes through the front rib inlet section 1151, the front rib gradual transition section 1152 and the front rib outlet section 1153 in sequence. Under the constraint of the continuous guide surface, the liquid flow is further adjusted and moves towards the main channel outlet. The two-stage guide effect with the front and rear staggered and the local projection overlap can reduce the sudden change at the guide junction position.

[0060] After leaving the main channel, the liquid enters the collection space of the pump body 8. The pump body 8 collects the liquid flow and converts part of the kinetic energy into pressure energy. The pressurized liquid is finally discharged from the outlet 9. The central continuous channel 117 continuously provides the flow gap during the above process to reduce the possibility of forming a closed blockage or local stagnation in the junction area of ​​the guide ribs.

[0061] When shutting down for maintenance, first disconnect the power of the drive motor 2 and confirm that the pump shaft 6 and impeller 11 have stopped rotating. Then, disassemble the transmission protective sleeve 3 or pump cover 7 to inspect the transmission parts, shaft seal assembly and impeller 11. If the impeller 11 needs to be repaired or replaced, the misalignment relationship, projection overlap relationship, non-contact relationship and continuity of the central continuous channel 117 of the two guide ribs should be rechecked.

[0062] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0063] Although embodiments of the 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 invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A low-flow-resistance impeller structure high-efficiency energy-saving centrifugal pump, comprising a pump body (8), a pump shaft (6), and an impeller (11), wherein the pump body (8) has an inlet (10) and an outlet (9), the pump shaft (6) is rotatably inserted into the pump body (8), and the impeller (11) is located inside the pump body (8) and mounted on the pump shaft (6), characterized in that, The impeller (11) includes a front cover plate (112) and a rear cover plate (113) arranged axially opposite to each other along the pump shaft (6), and multiple main blades (114) connected between the front cover plate (112) and the rear cover plate (113). A main channel extending from the center of the impeller (11) outwards is formed between two adjacent main blades (114). Each main channel is provided with a front cover plate guide rib (115) and a rear cover plate guide rib (116). The front cover plate guide rib (115) protrudes from the front cover plate (112) toward the rear cover plate (113), and the rear cover plate guide rib (116) protrudes from the front cover plate (112) toward the rear cover plate (113). Ribs (116) protrude from the rear cover plate (113) toward the front cover plate (112). The front cover plate guide ribs (115) and the rear cover plate guide ribs (116) are staggered along the direction of liquid flow from the center of the impeller (11) to the outer periphery and partially overlap in the projection along the axial direction of the pump shaft (6). The free ends of the front cover plate guide ribs (115) and the rear cover plate guide ribs (116) are spaced apart from each other along the axial direction of the pump shaft (6) and do not contact each other at any position. A central continuous channel (117) is formed between them, which extends continuously along the connection area of ​​the two guide ribs and is connected to the main channel.

2. The high-efficiency and energy-saving centrifugal pump with a low flow resistance impeller structure according to claim 1, characterized in that, Multiple main blades (114) are distributed circumferentially along the impeller (11), and a front cover plate guide rib (115) and a rear cover plate guide rib (116) are respectively provided in each main channel. The front cover plate guide rib (115) and the rear cover plate guide rib (116) in the same main channel are paired and matched.

3. The high-efficiency and energy-saving centrifugal pump with a low flow resistance impeller structure according to claim 2, characterized in that, The front cover guide rib (115) includes, in sequence along the liquid flow direction, a continuously formed front rib inlet section (1151), a front rib gradual transition section (1152), and a front rib outlet section (1153). The rear cover guide rib (116) includes, in sequence along the liquid flow direction, a continuously formed rear rib inlet section (1161), a rear rib gradual transition section (1162), and a rear rib outlet section (1163).

4. The high-efficiency and energy-saving centrifugal pump with a low flow resistance impeller structure according to claim 3, characterized in that, The front rib inlet section (1151), the front rib gradient transition section (1152), and the front rib outlet section (1153) together form a continuous front guide surface, and the rear rib inlet section (1161), the rear rib gradient transition section (1162), and the rear rib outlet section (1163) together form a continuous rear guide surface, with smooth transitions between adjacent sections.

5. A high-efficiency and energy-saving centrifugal pump with a low flow resistance impeller structure according to claim 2, characterized in that, The front cover guide rib (115) and the rear cover guide rib (116) both extend along the corresponding main channel, and the front cover guide rib (115) and the rear cover guide rib (116) are respectively spaced apart from the two main blades (114) that define the corresponding main channel.

6. The high-efficiency and energy-saving centrifugal pump with a low flow resistance impeller structure according to claim 1, characterized in that, One of the front cover guide rib (115) and the rear cover guide rib (116) is located upstream of the other, and the portion of the upstream guide rib near the outlet side of the main channel partially overlaps the portion of the downstream guide rib near the inlet side of the main channel along the axial projection of the pump shaft (6).

7. A high-efficiency and energy-saving centrifugal pump with a low flow resistance impeller structure according to claim 1, characterized in that, The main blade (114) is axially connected to the front cover plate (112) and the rear cover plate (113). The front cover plate guide rib (115) and the rear cover plate guide rib (116) each occupy only part of the axial space between the front cover plate (112) and the rear cover plate (113). The central continuous channel (117) remains connected within the overlapping area of ​​the axial projection of the two guide ribs.

8. A high-efficiency and energy-saving centrifugal pump with a low flow resistance impeller structure according to claim 1, characterized in that, The front cover plate (112) is provided with an impeller inlet ring (111) at its center. The impeller inlet ring (111) is opposite to the water inlet (10) and is connected to the inlet side of each of the main channels. The outlet side of each of the main channels is connected to the collection space inside the pump body (8). The collection space is connected to the water outlet (9).

9. A high-efficiency and energy-saving centrifugal pump with a low flow resistance impeller structure according to claim 1, characterized in that, It also includes a bearing housing (5) and a pump cover (7), the pump cover (7) being installed on one side of the pump body (8), and the pump shaft (6) passing through the pump cover (7) and rotatably supported in the bearing housing (5).

10. A high-efficiency and energy-saving centrifugal pump with a low flow resistance impeller structure according to claim 9, characterized in that, It also includes a base (1), a drive motor (2) and a transmission protective cylinder (3). The drive motor (2), the bearing housing (5) and the pump body (8) are mounted on the base (1). The output end of the drive motor (2) is connected to the pump shaft (6) for transmission. The transmission protective cylinder (3) covers the outside of the transmission area between the drive motor (2) and the bearing housing (5).

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