Plastic impeller of axial flow pump
The plastic impeller for axial flow pumps addresses the issues of corrosion and high costs in steel impellers by integrating a plastic design with fixed blades and reinforcing ribs, ensuring efficient water flow and reduced manufacturing complexity.
Patent Information
- Application Number
- CN202421135533.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-23
- Publication Date
- 2024-12-31
- Estimated Expiration
- 2034-05-23
AI Technical Summary
Existing axial flow pump impellers made of iron or stainless steel are heavy, prone to corrosion, and have high manufacturing costs due to complex welding requirements, affecting welding quality and efficiency.
A plastic impeller design with a front cover, blades, and a rear cover made of plastic, featuring a spherical crown body and reinforcing ribs, integrated or split for easy manufacturing, with fixed blades and hot-melt connections to enhance strength and stability, and a conical annular body for improved water flow guidance.
The plastic impeller reduces manufacturing costs, enhances strength and stability, and ensures efficient water flow without turbulence, while allowing for easier mold production and assembly.
Smart Images
Figure CN222277019U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of water pumps, in particular to a plastic impeller of an axial flow pump. Background Art
[0002] Axial flow pumps are suitable for situations with large flow and low head, such as irrigation, drainage, cooling, etc. In an axial flow pump, the impeller is the core component of the axial flow pump, and the water flow moves forward along the axial direction through the rotation of the impeller.
[0003] The impeller of an axial flow pump generally does not have front and rear covers. The impeller is usually composed of several parts such as blades, a hub, and a water guide cone. Most of the existing impellers are made of iron or stainless steel, which are relatively heavy and will cause corrosion after long-term use. Since the blades have a spatially distorted shape, they are generally welded to the hub. The blades are arc-shaped and spirally staggered between the blades. The welding position has a small space, which affects the welding quality of the blades and has a relatively high manufacturing cost. Summary of the invention
[0004] In view of the deficiencies in the prior art, the utility model aims to provide a plastic impeller for an axial flow pump.
[0005] The purpose of the utility model can be achieved through the following technical solutions: an axial flow pump plastic impeller, comprising a front cover, a plurality of blades and a rear cover made of plastic in one piece or in separate pieces, the rear cover having a spherical crown body, the outer diameter of the spherical crown body being smaller than the outer diameter of the front cover, the blades being circumferentially evenly arranged between the front cover and the spherical crown body, the bottom of the spherical crown body being recessed inward to form a concave cavity, a hub being arranged in the concave cavity, and a plurality of reinforcing ribs being circumferentially evenly arranged between the hub and the concave cavity wall.
[0006] This solution uses a front cover, several blades and a rear cover made of plastic, which can be integrated or split. The impeller made of plastic is relatively light, and plastic is corrosion-resistant and has a relatively low cost. The blades are fixed by the front cover and the rear cover to strengthen the strength of the blades. The rear cover is set as a spherical crown body, and the outer diameter of the spherical crown body is smaller than the outer diameter of the front cover. This is to enable the water flow to be better transported along the axial direction of the pipeline. The spherical crown body gives the water flow a diversion effect, so that the water flow is diverted out through the spherical crown body after the impeller spiral supercharges, avoiding turbulence. The bottom of the spherical crown body is concave inward to form a concave cavity, and a hub is set in the concave cavity. Several reinforcing ribs are evenly arranged circumferentially between the hub and the concave cavity wall, in order to increase the strength of the spherical crown body and make the blades fixed on the spherical crown body have better strength, so as to ensure the overall strength of the impeller. The integrated or split impeller can be molded in one time, without the need to weld the blades, and the product yield rate is high.
[0007] Furthermore, the front cover has a conical annular body, the conical annular body is tapered in the direction away from the spherical crown body, and a plurality of curved blocks are arranged on the outer peripheral top surface of the spherical crown body, and the outer ends of the curved blocks are close to the inner ends of the blades but not in contact, wherein a guide groove is formed between two adjacent curved blocks, and the opening of the guide groove faces the water passage between the two blades. The inner circumference of the conical annular body is larger than the outer circumference of the spherical crown body, and the inner circumference of the conical annular body has a relatively large opening, which increases the water intake; the water flows in from the inner circumference of the conical annular body, is spirally pressurized by the blades, and then flows out from the water passage. Since the impeller is adapted for use with an axial flow pump, the impeller is installed in a long pipe, and the drive shaft is connected to the external drive component to realize the rotation of the impeller, and then the water flow is transported from the bottom of the pipe to the top of the pipe, and the water flow flows axially along the pipe. Therefore, the water flow is guided out through the spherical crown body after being spirally pressurized by the impeller, which can avoid turbulence and make the water flow better transported along the axial direction; wherein a guide groove is arranged on the top of the spherical crown body, which can better guide the water flow out.
[0008] Furthermore, the front cover is independently injection molded, the rear cover and a plurality of blades evenly distributed on the rear cover are injection molded together, and the front cover and the blades are fixed by hot melt. This solution is more convenient for manufacturing the mold of the front cover and the mold of the blades and the rear cover, and the molds are fixed and assembled after the separate molding, which does not affect the strength of the impeller and is convenient for installation.
[0009] Furthermore, a plurality of evenly distributed fixing columns protrude from one end of the blade close to the front cover, and a stepped hole matching with the fixing column is provided on the front cover. The fixing column passes through the stepped hole and is fixed by hot-melting the fixing column. The stepped hole is large at the top and small at the bottom. The fixing column passes through the stepped hole and is hot-melted to cover the top of the stepped hole. The step portion of the stepped hole just fits the fixing column after hot-melting, thereby enhancing the stability and strength of the blade.
[0010] Furthermore, a plurality of fixing grooves are provided on one side of the front cover close to the blades, a row of fixed stepped holes opposite to one of the blades is located in one of the fixing grooves, and the end of the blade is embedded in the fixing groove.
[0011] After the blade end is embedded in the fixing groove, the fixing column and the stepped hole can be positioned, so that the fixing column can be better hot-melted later.
[0012] Furthermore, the front cover, the plurality of blades and the rear cover are integrally formed by injection molding.
[0013] Furthermore, a buckle is injection-molded and embedded in the wheel hub, and the buckle is used to fix the connection with the drive shaft.
[0014] Furthermore, the outer periphery of the buckle has circumferentially and axially arranged protrusions, and a mounting blind hole is provided in the middle of the buckle, and the mounting blind hole is used to mount the drive shaft. The circumferentially and axially arranged protrusions can better fix the protrusions in the hub, preventing the drive shaft from driving the impeller to rotate after the protrusions are connected to the drive shaft, and the circumferentially and axially arranged protrusions can limit the axial and axial movement of the protrusions, making it more stable.
[0015] Furthermore, the protrusions are protruding portions protruding outward from the outer circumference of the buckle, and the protrusions are evenly arranged in the circumferential direction and the axial direction. The protrusions arranged in the circumferential direction and the axial direction can limit the axial and axial movement of the protrusions, making them more stable.
[0016] Furthermore, the outer circumferential surface of the buckle is inwardly recessed with a concave-convex groove, and the protruding portion of the concave-convex groove is a bump. The bumps arranged circumferentially and axially can limit the axial and axial movement of the bumps, making it more stable.
[0017] Compared with the prior art, the technical effects of the utility model are as follows: 1. The integrated or split plastic impeller can reduce the manufacturing cost; 2. The blades are fixed by the front cover and the rear cover to strengthen the strength of the blades, wherein the rear cover is set as a spherical crown body, so that the water flow is guided out through the spherical crown body after the impeller spiral supercharges, avoiding turbulence; 3. A number of reinforcing ribs are evenly arranged circumferentially between the hub and the concave cavity wall, which increases the strength of the spherical crown body and makes the blades fixed on the spherical crown body have better strength, ensuring the overall strength of the impeller. 4. The split-design impeller is fixed by hot-melt after the fixing column passes through the stepped hole, which can not only ensure the strength of the impeller but also facilitate the manufacture of the mold and make the processing more convenient; 5. The one-piece impeller can reduce the processing technology, making its processing more convenient; 6. The circumferentially and axially arranged protrusions can limit the axial and axial movement of the protrusions, making it more stable. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 It is a cross-sectional view of the utility model.
[0019] Figure 2 It is the front view of the utility model.
[0020] Figure 3 It is a three-dimensional diagram of the utility model.
[0021] Figure 4 It is an exploded view of the utility model.
[0022] Figure 5 It is another embodiment of the buckle of the utility model.
[0023] 1. front cover; 101. conical annular body; 102. stepped hole; 103. fixing groove;
[0024] 2. Blades; 201. Water passage; 202. Fixed column;
[0025] 3. rear cover; 301. spherical crown body; 302. concave cavity; 303. wheel hub; 304. reinforcing rib plate; 305. curved surface block; 306. guide groove;
[0026] 4. Buckle; 401. Bump; 402. Mounting blind hole; 403. Concave and convex groove. DETAILED DESCRIPTION
[0027] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.
[0028] according to Figures 1 to 4 As shown, a plastic impeller for an axial flow pump is suitable for use with an axial flow pump. The impeller is installed in a long pipe, and the drive shaft is connected to an external drive component to realize the rotation of the impeller, and then the water flow is transported from the bottom of the pipe to the top of the pipe, and the water flow flows along the axial direction of the pipe. The impeller is made of plastic material as a whole. The impeller includes a front cover 1, a plurality of blades 2 and a rear cover 3, wherein the front cover 1, the plurality of blades 2 and the rear cover 3 can be injection molded at one time using a mold; or they can be molded in separate molds, that is, the front cover 1, the blades 2 and the rear cover 3 are formed by three molds or the front cover 1 is independently injection molded, and the rear cover 3 and the plurality of blades 2 evenly distributed on the rear cover 3 are injection molded together.
[0029] The rear cover 3 of both the integrally formed and separately formed impellers has a spherical crown body 301, the outer diameter of the spherical crown body 301 is smaller than the outer diameter of the front cover 1, the blades 2 are evenly arranged circumferentially between the front cover 1 and the spherical crown body 301, the bottom of the spherical crown body 301 is recessed inward to form a concave cavity 302, a hub 303 is arranged in the concave cavity 302, and a number of reinforcing ribs 304 are evenly arranged circumferentially between the hub 303 and the wall of the concave cavity 302. Regardless of whether it is split or integrated, the blades 2 are fixed by the front cover 1 and the rear cover 3 to strengthen the strength of the blades 2, wherein the rear cover 3 is configured as a spherical crown body 301, and the outer diameter of the spherical crown body 301 is smaller than the outer diameter of the front cover 1, so that the water flow can be better transported along the axial direction of the pipeline, and the spherical crown body 301 gives the water flow a diversion effect, so that the water flow is diverted out through the spherical crown body 301 after passing through the impeller spiral supercharger to avoid turbulence; the bottom of the spherical crown body 301 is concave inward to form a concave cavity 302, and a hub 303 is arranged in the concave cavity 302. A number of reinforcing ribs 304 are evenly arranged circumferentially between the hub 303 and the wall of the concave cavity 302, in order to increase the strength of the spherical crown body 301 and make the blades 2 fixed on the spherical crown body 301 also have better strength, thereby ensuring the overall strength of the impeller.
[0030] Preferably, the front cover 1 has a conical annular body 101, the conical annular body 101 is tapered in the direction away from the spherical crown body 301, and a plurality of curved blocks 305 are arranged on the outer peripheral top surface of the spherical crown body 301, and the outer ends of the curved blocks 305 are close to the inner ends of the blades 2 but not in contact, wherein a guide groove 306 is formed between two adjacent curved blocks 305, and the opening of the guide groove 306 faces the water passage 201 between the two blades 2. The inner circumference of the conical annular body 101 is larger than the outer circumference of the spherical crown body 301, and the inner circumference opening of the conical annular body 101 is relatively large, which increases the water intake; the water flows in from the inner circumference of the conical annular body 101, is spirally pressurized by the blades 2, and then flows out from the water passage 201. Therefore, the water flows out through the spherical crown body 301 after being spirally pressurized by the impeller, which can avoid turbulence and make the water flow better transported along the axial direction; wherein a guide groove 306 is provided on the top of the spherical crown body 301, which can better guide the water flow out.
[0031] The preferred fixing structure of the blade 2 and the front cover 1 in the split impeller is as follows: a plurality of evenly distributed fixing posts 202 protrude from one end of the blade 2 close to the front cover 1, and a stepped hole 102 matching the fixing post 202 is provided on the front cover 1. The fixing post 202 passes through the stepped hole 102 and is hot-melted to be formed and fixed. The stepped hole 102 is large at the top and small at the bottom. The fixing post 202 passes through the stepped hole 102 and is hot-melted to cover the top of the stepped hole 102. The step portion of the stepped hole 102 just fits the fixing post 202 after hot-melting, thereby enhancing the stability and strength of the blade 2. A plurality of fixing grooves 103 are provided on one side of the front cover 1 close to the blade 2, and a row of fixed stepped holes 102 opposite to one of the blades 2 is fixed in one of the fixing grooves 103, and the end of the blade 2 is embedded in the fixing groove 103. After the end of the blade 2 is embedded in the fixing groove 103, the fixing post 202 and the stepped hole 102 can be positioned, so that the fixing post 202 can be better hot-melted later.
[0032] The impeller is fixedly connected to the drive shaft, wherein a buckle is embedded in the hub 303 by injection molding to improve the stability with the drive shaft. The buckle has circumferential and axially arranged protrusions on the outer periphery, and a mounting blind hole is arranged in the middle of the buckle, and the mounting blind hole is used to mount the drive shaft. The first preferred embodiment of the protrusion is ( Figure 4 As shown): The outer peripheral surface of the buckle is inwardly recessed with a concave-convex groove, and the convex portion of the concave-convex groove is a convex block. The implementation of the convex block is not limited to these two. The second preferred implementation of the convex block is ( Figure 5 As shown in the figure): The protrusion is a protruding portion protruding outward from the outer circumference of the buckle, and the protrusions are evenly arranged in the circumferential direction and the axial direction. The protrusions arranged in the circumferential direction and the axial direction can better fix the protrusion in the hub 303 to prevent the drive shaft from driving the impeller to rotate after the protrusion is connected to the drive shaft. The protrusions arranged in the circumferential direction and the axial direction can limit the axial and axial movement of the protrusion, making it more stable.
[0033] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope defined by the claims of the present invention.
Claims
1. A plastic impeller for an axial flow pump, characterized in that: The invention comprises a front cover (1) made of plastic in one piece or in separate pieces, a plurality of blades (2) and a rear cover (3), wherein the rear cover (3) comprises a spherical crown-shaped body (301), the outer diameter of the spherical crown-shaped body (301) being smaller than the outer diameter of the front cover (1), the blades (2) being evenly arranged circumferentially between the front cover (1) and the spherical crown-shaped body (301), the bottom of the spherical crown-shaped body (301) being recessed inwards to form a concave cavity (302), a wheel hub (303) being arranged in the concave cavity (302), and a plurality of reinforcing rib plates (304) being evenly arranged circumferentially between the wheel hub (303) and the wall of the concave cavity (302).
2. The axial flow pump plastic impeller according to claim 1, characterized in that: The front cover (1) comprises a conical annular body (101), the conical annular body (101) shrinking in a direction away from the spherical crown body (301), a plurality of curved blocks (305) are arranged on the top surface of the outer periphery of the spherical crown body (301), the outer ends of the curved blocks (305) are close to the inner ends of the blades (2) but do not contact them, a guide groove (306) is formed between two adjacent curved blocks (305), and the opening of the guide groove (306) faces the water passage (201) between the two blades (2).
3. The axial flow pump plastic impeller according to claim 1, characterized in that: The front cover (1) is independently injection-molded, the rear cover (3) and a plurality of blades (2) evenly distributed on the rear cover (3) are injection-molded together, and the front cover (1) and the blades (2) are fixed by hot melting.
4. The axial flow pump plastic impeller according to claim 3, characterized in that: A plurality of evenly distributed fixing columns (202) protrude from one end of the blade (2) close to the front cover (1), and a stepped hole (102) matching the fixing column (202) is provided on the front cover (1), and the fixing column (202) is formed and fixed by hot melting after passing through the stepped hole (102).
5. The axial flow pump plastic impeller according to claim 4, characterized in that: A plurality of fixing grooves (103) are provided on a side of the front cover (1) close to the blades (2); a row of stepped holes (102) opposite to one of the blades (2) is located in one of the fixing grooves (103); and an end of the blade (2) is embedded in the fixing groove (103).
6. The axial flow pump plastic impeller according to claim 1, characterized in that: The front cover (1), the plurality of blades (2) and the rear cover (3) are integrally formed by injection molding.
7. An axial flow pump plastic impeller according to any one of claims 1 to 6, characterized in that: A buckle (4) is injection-molded and embedded in the wheel hub (303), and the buckle (4) is used to fix the connection with the drive shaft.
8. The axial flow pump plastic impeller according to claim 7, characterized in that: The outer periphery of the buckle (4) has circumferentially and axially arranged protrusions (401), and the middle of the buckle (4) is provided with a mounting blind hole (402), and the mounting blind hole (402) is used for mounting the drive shaft.
9. The axial flow pump plastic impeller according to claim 8, characterized in that: The protrusions (401) are protruding portions protruding outward from the outer circumferential surface of the buckle (4), and the protrusions (401) are evenly distributed in the circumferential direction and the axial direction.
10. The plastic impeller of an axial flow pump according to claim 8, characterized in that: The outer circumferential surface of the buckle (4) is inwardly recessed with a concave-convex groove (403), and the raised portion of the concave-convex groove (403) is a convex block (401).