An injection molded submersible pump closed impeller and production method thereof

Abstract

The invention discloses an injection-molded closed impeller for a submersible pump, which is formed by buckling and connecting an injection-molded rear disc and an injection-molded front disc, wherein the rear disc comprises a disc body, a plurality of blades protruding from the surface of the disc body are arranged on the disc body, the blades are provided with front disc mating end faces that match the front disc, the front disc mating end faces of the blades are provided with connecting plugs protruding from the front disc mating end faces, the front disc is provided with connecting sockets corresponding to the number, position and shape of the connecting plugs, a filling groove surrounding the connecting socket is arranged on the surface of the front disc on the side facing away from the blades, a connecting plastic body is filled in the filling groove, the injection-molded closed impeller for a submersible pump has no welding structure, has no requirements on the welding performance of the engineering plastics used to produce the impeller, and has high strength, good shock resistance and long service life.

Description

Technical Field

[0001] The invention relates to a submersible pump impeller and a production method thereof, in particular to a submersible pump closed impeller produced by an injection molding process and a production method thereof. Background Art

[0002] The closed impeller of the submersible pump in the prior art is mostly made of cast iron. Due to its large weight, this cast iron impeller requires a large torque when starting, which easily causes the motor to overload, and it also consumes a certain amount of electricity during normal operation, so the energy saving effect is not good. In addition, this cast iron impeller is mostly cast by sand mold, and there is a machined dead angle inside the impeller, which causes the impeller's inner surface finish to be poor, affecting the efficiency of the impeller. In order to overcome this drawback of the cast iron impeller, some water pumps use engineering plastics to make impellers. However, due to the special angle of the blades during the production process, it will lead to the impeller being unable to be demolded after the integral injection molding. Therefore, only some plastic impellers with relatively simple structures can be produced, which cannot meet the requirements of producing efficient closed impellers for submersible pumps, limiting the production and application of plastic impellers. CN 203906378 U discloses an impeller structure of a pump, the impeller structure of the pump includes an impeller front cover plate with an axial inlet in the middle and an impeller rear cover plate for connecting to the pump motor shaft, the impeller front cover plate and the impeller rear cover plate are mutually buckled, a radial outlet connected to the axial inlet is provided between the impeller front cover plate and the impeller rear cover plate, the impeller rear cover plate is located on one side of the impeller front cover plate and has a plurality of radially uniformly distributed blades, the radial outlets are a plurality of and are respectively located between two adjacent blades, a connecting structure for connecting the impeller front cover plate and the impeller rear cover plate is provided between the end face of the blade and the impeller front cover plate, and the impeller adopts an ultrasonic welding process to weld the impeller front cover plate, the rear cover plate and the blades together to form an impeller. However, the impeller produced by this ultrasonic welding process has a large internal stress, and is prone to breakage at the welding portion when the impeller vibrates during use. In addition, in order to increase the strength of engineering plastics, reinforcing glass fibers are usually added to PPS plastics. However, the addition of glass fibers will affect the welding performance of PPS plastics, making it difficult to weld the impeller during the manufacturing process and more likely to break at the weld during use. Summary of the invention

[0003] The technical problem to be solved by the invention is: to overcome the above-mentioned defects of the prior art and to provide an injection-molded submersible pump closed impeller. The injection-molded submersible pump closed impeller has no welding structure and no requirements on the welding performance of the engineering plastic used to produce the impeller. The impeller has high strength, good shock resistance and long service life.

[0004] The technical solution adopted to solve the technical problem: an injection-molded submersible pump closed impeller is formed by buckling and connecting an injection-molded rear disk and an injection-molded front disk, the rear disk includes a disk body, a plurality of blades protruding from the disk body surface are provided on the disk body, the blades have front disk mating end faces that match the front disk, the front disk mating end faces of the blades are provided with connecting plugs protruding from the front disk mating end faces, the front disk is provided with connecting sockets corresponding to the number, position and shape of the connecting plugs, a filling groove surrounding the connecting socket is provided on the surface of the front disk facing away from the blades, and the filling groove is filled with a connecting plastic body.

[0005] As an improvement of the present invention: the connecting plug is an inverted wedge-shaped connecting plug with a wide end and a narrow root.

[0006] As a further improvement of the present invention: at least two connecting plugs are arranged along the direction on the matching end surface of the front disk of the blade.

[0007] As a further improvement of the present invention: the filling groove is a narrow and long filling groove arranged along the direction of the matching end surface of the blade front disk and can completely surround the connecting socket corresponding to the same blade.

[0008] As another improvement of the present invention: a blade positioning boss is provided on the matching end surface of the front disk of the blade, and a blade positioning groove matching with the blade positioning boss is provided on the connecting side of the front disk and the blade.

[0009] As another improvement of the present invention, a mouth ring is provided at the center of the front disk facing away from the blades, a metal wear-resistant ring is inlaid on the outer circumference of the mouth ring, and at least one annular fixing groove is provided on the inner circumference of the metal wear-resistant ring.

[0010] Another technical problem to be solved by the invention is to provide a method for producing an injection-molded submersible pump closed impeller. This method can produce a submersible pump closed impeller without a welding structure. The production of submersible pump closed impellers by this method is not limited by the welding performance of the material. The produced submersible pump closed impeller has high strength and low internal stress.

[0011] Technical solution adopted to solve the technical problem: A production method of an injection-molded submersible pump closed impeller includes the following process steps:

[0012] The rear disc with blades is produced by injection molding process, a front disc matching end face matching with the front disc is formed at the end of the blade, and a connecting plug protruding from the front disc matching end face is formed on the front disc matching end face of the blade;

[0013] The front disc with the connection socket is produced by injection molding, and a filling groove surrounding the connection socket is formed on the surface of the front disc facing away from the blade;

[0014] The rear plate and the front plate are assembled by press fitting, the connecting plug is inserted into the connecting jack, and the molten plastic is injected into the filling groove to fill the filling groove, and the plastic in the filling groove is cooled to form a connecting plastic body;

[0015] The burrs on the impeller surface are polished to obtain the injection molded submersible pump closed impeller finished product.

[0016] Beneficial effects: The closed impeller of the injection-molded submersible pump of the present invention is formed by buckling and connecting an injection-molded rear disc and an injection-molded front disc, the rear disc includes a disc body, a plurality of blades protruding from the disc body surface are arranged on the disc body, the blades have a front disc mating end face that matches the front disc, the front disc mating end face of the blades is provided with a connecting plug protruding from the front disc mating end face, the front disc is provided with a connecting jack corresponding to the number, position and shape of the connecting plug, the surface of the front disc on the side facing away from the blades is provided with a stuffing groove surrounding the connecting jack, and the stuffing groove is provided with a connecting plug. The invention discloses a technical solution in which a connecting plastic body is filled in the middle, and the connecting plastic body is used to tighten and lock the blades and the front disk from the back of the front disk into an integrated structure, so that the front disk and the rear disk are assembled into a non-welded injection-molded submersible pump closed impeller. Therefore, the structure of the injection-molded submersible pump closed impeller of the invention replaces the ultrasonic welding process in the prior art, and has no requirements on the welding performance of the engineering plastics used to produce the impeller, so that the water pump impeller can also be produced using the glass fiber-added PPS material, and the produced impeller has small internal stress, high strength, good shock resistance and long service life. Due to the technical feature that the connecting plug is a wide-end and narrow-root inverted wedge-shaped connecting plug, the connection between the connecting plug and the connecting plastic body is more secure, which can effectively prevent the blades from falling off from the front disk, so that the injection-molded submersible pump closed impeller of the invention works more stably and has higher reliability. Due to the technical feature that at least two connecting plugs are provided on the upper direction of the front disk mating end surface of the blade, the force on the blade is more uniform and the bearing capacity is stronger. Due to the technical feature that the filling groove is arranged along the direction of the matching end face of the front disc of the blade and can completely surround the connecting socket corresponding to the same blade, it is not only more convenient to inject plastic into the filling groove, but also multiple connecting plugs are connected into a whole by the connecting plastic body, so that the connection between the blade and the front disc is more secure. Due to the technical feature that a blade positioning boss is provided on the matching end face of the front disc of the blade, and a blade positioning groove matching the blade positioning boss is provided on the connecting side of the front disc and the blade, on the one hand, the positioning of the blade and the front disc during the production process is more convenient and more accurate, and on the other hand, the load of the blade when working is carried by the positioning boss, which can effectively avoid the connection plug from breaking, so that the injection molded submersible pump closed impeller of the present invention has a stronger bearing capacity. Due to the technical feature that a mouth ring is provided at the center position of the side of the front disc facing away from the blade, a metal wear-resistant ring is inlaid on the outer circumference of the mouth ring, and at least one annular fixing groove is provided on the inner circumference of the metal wear-resistant ring, the anti-wear characteristics of the impeller are improved, and the application range of the impeller is wider. Due to the technical feature of first injecting the front disc and the rear disc, and then injecting molten plastic into the filling groove to fill the filling groove, the last injection molding replaces the ultrasonic welding process in the prior art, thereby realizing the welding-free production of the plastic impeller of the water pump, and being able to meet the production requirements of closed impellers of submersible pumps with complex angles. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The injection molded submersible pump closed impeller of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0018] Figure 1 It is a schematic diagram of the structure of the closed impeller of the injection-molded submersible pump of the present invention. DETAILED DESCRIPTION

[0019] like Figure 1 As shown, the injection molded submersible pump closed impeller of the present invention is formed by buckling and connecting the injection molded rear disc 4 and the injection molded front disc 3. A mouth ring 1 is provided at the center of the front disc on the side facing away from the blades, a metal wear-resistant ring 6 is inlaid on the outer circumference of the mouth ring, and at least one annular fixing groove is provided on the inner circumference of the metal wear-resistant ring. The rear disc includes a disc body 13, on which a plurality of blades 5 protruding from the surface of the disc body are provided, and the blades have a front disc mating end face 7 that matches the front disc, and a connecting plug 10 protruding from the front disc mating end face is provided on the front disc mating end face of the blade, and the connecting plug is an inverted wedge-shaped connecting plug with a wide end and a narrow root, and the front disc is provided with a connecting jack 12 corresponding to the number, position and shape of the connecting plug, and a filling groove 9 surrounding the connecting jack is provided on the surface of the front disc on the side facing away from the blades, and a connecting plastic body 2 is filled in the filling groove, and the connecting plastic body is melted into one with the connecting plug and the front disc.

[0020] Preferably, at least two connecting plugs are provided along the direction of the front disk mating end face of the blade, and the filling groove is a narrow and long filling groove arranged along the direction of the front disk mating end face of the blade, which can completely surround the connecting sockets corresponding to the same blade, and a blade positioning boss 8 is provided on the front disk mating end face of the blade, and a blade positioning groove 11 matching the blade positioning boss is provided on the connecting side of the front disk and the blade.

[0021] The production method of the injection-molded submersible pump closed impeller of the present invention comprises the following process steps:

[0022] The rear disc with blades is produced by injection molding process, a front disc matching end face matching with the front disc is formed at the end of the blade, and a connecting plug protruding from the front disc matching end face is formed on the front disc matching end face of the blade;

[0023] The front disc with the connection socket is produced by injection molding, and a filling groove surrounding the connection socket is formed on the surface of the front disc facing away from the blade;

[0024] The rear disc and the front disc are assembled by press fitting, so that the rear disc and the front disc are matched, and the connecting plug is inserted into the connecting jack, and the end surface of the connecting plug is not higher than the surface of the front disc on the side facing away from the blades, and the molten plastic is injected into the filling groove to fill the filling groove, and a connecting plastic body is formed after cooling;

[0025] The burrs on the impeller surface are polished to obtain the injection molded submersible pump closed impeller finished product.

Claims

1. A method for producing an injection-molded closed impeller for a submersible pump, wherein the injection-molded closed impeller for a submersible pump is formed by buckling and connecting an injection-molded rear disc and an injection-molded front disc, wherein the rear disc comprises a disc body, a plurality of blades protruding from the disc body surface are arranged on the disc body, the blades have a front disc mating end face that matches the front disc, a connecting plug protruding from the front disc mating end face is arranged on the front disc mating end face of the blade, a connecting jack corresponding to the number, position and shape of the connecting plug is arranged on the front disc, a filling groove surrounding the connecting jack is arranged on the surface of the front disc facing away from the blade, a connecting plastic body is filled in the filling groove, and the characteristics are as follows: The production method of the injection-molded submersible pump closed impeller comprises the following process steps: The rear disc with blades is produced by injection molding process, a front disc matching end face matching with the front disc is formed at the end of the blade, and a connecting plug protruding from the front disc matching end face is formed on the front disc matching end face of the blade; The front disc with the connection socket is produced by injection molding, and a filling groove surrounding the connection socket is formed on the surface of the front disc facing away from the blade; The rear plate and the front plate are assembled by press fitting, the connecting plug is inserted into the connecting jack, and the molten plastic is injected into the filling groove to fill the filling groove, and the plastic in the filling groove is cooled to form a connecting plastic body; The burrs on the impeller surface are polished to obtain the injection molded submersible pump closed impeller finished product.

2. The method for producing an injection molded submersible pump closed impeller according to claim 1, characterized in that: The connecting plug is an inverted wedge-shaped connecting plug with a wide end and a narrow root.

3. The method for producing a closed impeller for a submersible pump by injection molding according to claim 2, characterized in that: At least two connecting plugs are arranged along the front disk matching end surface of the blade.

4. The method for producing a closed impeller for a submersible pump by injection molding according to claim 3, characterized in that: The filling groove is a narrow and long filling groove which is arranged along the direction of the matching end surface of the front disk of the blade and can completely surround the connecting socket corresponding to the same blade.

5. The method for producing a closed impeller for a submersible pump by injection molding according to any one of claims 1 to 4, characterized in that: A blade positioning boss is arranged on the matching end surface of the front disk of the blade, and a blade positioning groove matching with the blade positioning boss is arranged on the connecting side of the front disk and the blade.

6. The method for producing a closed impeller for a submersible pump by injection molding according to claim 5, characterized in that: A mouth ring is arranged at the center of the front disc facing away from the blades, a metal wear-resistant ring is inlaid on the outer circumference of the mouth ring, and at least one annular fixing groove is arranged on the inner circumference of the metal wear-resistant ring.

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