Mixed-flow pump guide piece

Abstract

The utility model provides a mixed-flow pump guiding piece, and belongs to the technical field of mechanical equipment. The technical problems that an existing guide piece is long in machining period, inconvenient to install and the like are solved. The mixed-flow pump guide part comprises a shell and a guide wheel arranged in the shell, the shell is formed by punching stainless steel pipes, the guide wheel is integrally formed by plastics, the guide wheel comprises a volute, a plurality of guide blades and a hub which are sequentially connected from outside to inside, and the upper portion of the volute is provided with a first circular ring installation portion, a second circular ring installation portion and a curved surface portion which protrude outwards. The diameters of the outer peripheral surfaces of the curved surface parts are smaller than those of the circular ring mounting part I and the circular ring mounting part II, and the outer peripheral surfaces of the circular ring mounting part I and the circular ring mounting part II are in interference fit with the inner peripheral surface of the shell. The utility model has the advantages of shorter production cycle and more convenience in installation.

Description

Technical Field

[0001] The utility model belongs to the technical field of mechanical equipment, in particular to a mixed flow pump guide. Background Art

[0002] The working principle of the mixed flow pump is that the rotation of the impeller generates the combined effect of centrifugal force and thrust, which sucks the liquid into the pump body and obtains kinetic energy through the rotation of the impeller, which is then converted into pressure energy and finally discharged from the pump body. After the liquid flows out of the impeller, it has forward axial motion and swirling motion, so the flow of the liquid after passing through the impeller is a spiral forward motion. When the liquid swirls, friction loss will consume this part of the energy of the swirling motion. In order to convert the kinetic energy of the liquid's swirling motion into pressure energy, a guide wheel is installed in front of the impeller water outlet.

[0003] At present, in the prior art, the guide of the mixed flow pump is basically cast in one piece of stainless steel. Stainless steel casting requires molding with a mold first, and cooling after casting. It also needs to be aged for a period of time and then the assembly stoppers at both ends are machined, and the screw holes for drilling and tapping are used for fastening. During processing, a tooling fixture is also required to clamp the parts. Due to the uneven wall thickness of the parts and changes in the production environment conditions, there are risks of various casting defects in the casting production process. The production process from casting to processing has a long production cycle and low production efficiency.

[0004] And because the guide vanes in the guide parts of the mixed flow pump are bent, there is a certain proportion of casting defects in the stainless steel casting guide vanes, which need to be repaired or even scrapped. There are also guide parts assembled and welded with stainless steel stamping parts, but due to the distortion of the internal space of the guide parts, the blades on the guide parts will be modified to a certain extent, resulting in a reduction in the water flow pressure at the outlet, affecting the performance of the product; at the same time, the welding position space is small, and welding often cannot be carried out continuously, and needs to be carried out in sections, which affects the quality of the product. Summary of the invention

[0005] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a mixed flow pump guide. The technical problem to be solved by the present invention is: how to shorten the production cycle of the mixed flow pump guide, facilitate installation, and improve production efficiency and product quality.

[0006] The purpose of the utility model can be achieved through the following technical solutions: a mixed flow pump guide, including an outer shell and a guide wheel arranged in the outer shell, the outer shell is stamped and formed by a stainless steel pipe, the guide wheel is integrally formed by plastic, the guide wheel includes a volute, a plurality of guide blades and a hub connected in sequence from the outside to the inside, the upper part of the volute has an outwardly protruding circular ring mounting portion 1, and the lower part has a circular ring mounting portion 2 with a diameter equivalent to the outer circumferential surface of the circular ring mounting portion 1, the volute also has a curved portion that smoothly connects the circular ring mounting portion 1 and the circular ring mounting portion 2, the outer circumferential surface diameters of the curved portion are smaller than the outer circumferential surface diameters of the circular ring mounting portion 1 and the circular ring mounting portion 2, and the outer circumferential surfaces of the circular ring mounting portion 1 and the circular ring mounting portion 2 are interference fit with the inner circumferential surface of the outer shell.

[0007] The mixed flow pump guide is formed by the interference fit installation of the shell formed by stamping of stainless steel pipe material and the guide wheel formed by plastic injection molding, which reduces the casting process, shortens the production cycle and improves the production efficiency; the outer circumference of the ring mounting part one and the ring mounting part two is interference fit with the inner circumference of the shell, and the ring mounting part one and the ring mounting part two are smoothly connected by the curved part, and the curved part is curved with a gap between the inner wall of the shell. This is set up because the guide wheel and the shell are interference fit, the guide wheel has a certain height, and the setting of the middle gap is conducive to installing the guide wheel into the shell, which is convenient for installation; in order to ensure that the guide wheel of the plastic part can maintain long-term use without environmental stress cracking, fatigue and other failures, the stainless steel shell is interference pressed on the outside of the plastic guide wheel to make them rigidly supported, avoid the plastic guide from being under pressure, and improve product quality.

[0008] Furthermore, the curved surface portion has a narrow channel and a wide channel with smooth transitions to each other, the hub-connected guide blades are arranged in the narrow channel, and an impeller is installed in the wide channel, and the impeller is coaxially arranged with the hub.

[0009] This solution draws in external fluid through the impeller. The wide-mouth channel where the impeller is installed is relatively large, which is conducive to increasing the amount of water sucked in. Above the impeller is a flow channel composed of guide blades. The guide blades are arranged in the narrow-mouth channel. The fluid sucked in by the impeller is transported from the large space to the small space of the guide blades, which reduces the flow velocity of the fluid, increases the pressure of the fluid, ensures the efficient operation of the water pump, and improves the product quality.

[0010] Furthermore, the hub is in a hollow cone shape, the guide blades are arranged evenly in a spiral shape on the outer side of the hub, and the other end is connected to the volute, and a water passage is formed between each two adjacent guide blades. The inlet angle of the guide blades arranged evenly in a spiral shape is consistent with the flow direction of the impeller outlet fluid, avoiding energy loss caused by impact.

[0011] Furthermore, the shell includes a cylindrical portion and a circular ring plate disposed at the upper end of the cylindrical portion and protruding inward, the circular ring plate has a plurality of through holes evenly distributed in the circumference, and the circular ring mounting portion has an injection molded insert one evenly distributed in the circumference, and the injection molded insert one corresponds to the through holes one by one. The guide parts of the stainless steel castings need to be machined and drilled and tapped, and the requirements for tools and drill bits are also very high, and there is a certain amount of use loss, which invisibly increases the processing cost, while the outer dimensional accuracy of the shell formed by stamping can be achieved without processing, and injection molded copper inserts are used, and there is no need to drill and tap on the guide parts. When the guide wheel is injected, the temperature, pressure and other process conditions are adjusted, and the guide wheel will not be short of material, which facilitates processing and production while reducing costs; the upper end face of the circular ring plate abuts against the lower end face of the water outlet node, so that the stainless steel shell bears the pressure of connecting the water outlet node and protects the plastic guide wheel.

[0012] Furthermore, the upper end surface of the injection molded insert 1 is higher than the upper end surface of the circular ring mounting portion 1, and the upper end surface of the injection molded insert 1 abuts against the lower end surface of the circular ring plate.

[0013] Furthermore, the annular mounting portion is evenly distributed with a plurality of injection-molded inserts 2 in the circumferential direction, a cover plate is provided below the cylindrical portion, the cover plate has a mounting platform protruding outward, the bottom surface of the cylindrical portion abuts against the upper end surface of the mounting platform, the lower portion of the impeller extends into the cover plate, the impeller rotates relative to the cover plate, and the cover plate has mounting holes corresponding one to one with the injection-molded inserts 2.

[0014] The guide parts of stainless steel castings need to be turned and drilled, and the requirements for tools and drill bits are also very high. There is a certain amount of wear and tear, which invisibly increases the processing cost. The outer dimensional accuracy of the stamped shell can be achieved without processing, and the injection molded copper inserts are used, and there is no need to drill and tap on the guide parts, which facilitates processing and production while also reducing costs; the bottom surface of the cylindrical part rests on the upper surface of the mounting table, so that the stainless steel shell bears the pressure of the connecting cover plate and protects the plastic guide wheel; the lower part of the impeller extends into the cover plate, and there is a through hole in the middle of the cover plate for the lower part of the impeller to extend into, and water flows in from this through hole.

[0015] Compared with the prior art, the technical effects of the utility model are as follows: 1. The mixed flow pump guide is formed by the interference fit installation of the shell formed by stamping of stainless steel pipe material and the guide wheel formed by plastic injection molding, which reduces the casting procedure, shortens the production cycle, and improves production efficiency; there is a gap between the curved surface portion and the inner wall of the shell, which is conducive to installing the guide wheel into the shell and facilitates installation; the stainless steel shell is interference-pressed on the outside of the plastic guide wheel to make them rigidly supported, avoids the plastic guide from being subjected to pressure, and improves product quality.

[0016] 2. The fluid sucked in by the impeller is transported from the large space to the small space of the guide vanes, which reduces the flow velocity of the fluid and increases the pressure of the fluid, ensuring the efficient operation of the pump and improving product quality.

[0017] 3. The outer dimensions of the stamped shell are accurate enough to avoid machining. The copper inserts are molded without drilling or tapping the guides. When the temperature and pressure are adjusted during injection molding, the guide wheels will not be short of material, which makes processing and production easier while reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a cross-sectional view of the utility model.

[0019] Figure 2 The utility model is a cross-sectional view Figure 2 .

[0020] Figure 3 It is an AA enlarged view of the utility model.

[0021] Figure 4 It is a cutaway stereoscopic view of the guide wheel of the utility model.

[0022] Figure 5 It is an exploded view of the utility model.

[0023] Figure number marking: 1. outer shell; 11. cylindrical part; 12. annular plate; 13. through hole; 2. guide wheel; 21. volute; 211. annular mounting part 1; 212. annular mounting part 2; 213. curved part; 214. narrow passage; 215. wide passage; 22. guide blade; 23. hub; 3. injection molded insert 1; 4. injection molded insert 2; 5. cover plate; 51. mounting platform; 6. impeller; 7. water outlet section. DETAILED DESCRIPTION

[0024] 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.

[0025] according to Figures 1 to 5As shown: a mixed flow pump guide, including a shell 1 and a guide wheel 2 arranged in the shell 1, the shell 1 is stamped and formed by a stainless steel pipe material, the guide wheel 2 is integrally formed by plastic, the guide wheel 2 is composed of a volute 21, a plurality of guide blades 22 and a hub 23 connected in sequence from the outside to the inside, the volute 21 has an outwardly protruding circular ring mounting portion 1 211 on the upper part, and a circular ring mounting portion 212 with a diameter equivalent to the outer circumferential surface of the circular ring mounting portion 1 211 on the lower part, the volute 21 also has a curved surface portion 213 that smoothly connects the circular ring mounting portion 1 211 and the circular ring mounting portion 212, the outer circumferential surface diameters of the curved surface portion 213 are smaller than the outer circumferential surface diameters of the circular ring mounting portion 1 211 and the circular ring mounting portion 212, and the outer circumferential surfaces of the circular ring mounting portion 1 211 and the circular ring mounting portion 212 are interference fit with the inner circumferential surface of the shell 1.

[0026] The curved surface 213 has a narrow channel 214 and a wide channel 215 with smooth transitions to each other. The hub 23 is connected to the guide blades 22 and is arranged in the narrow channel 214. The wide channel 215 is equipped with an impeller 6, and the impeller 6 is arranged coaxially with the hub 23. The hub 23 is in the shape of a hollow cone, and the guide blades 22 are arranged evenly and spirally on the outside of the hub 23, and the other end is connected to the volute 21. There are 6 to 12 guide blades 22, and a water flow channel is formed between each two adjacent guide blades 22. The inlet angle of the guide blades 22, which are arranged evenly and spirally, is consistent with the flow direction of the fluid at the outlet of the impeller 6 to avoid energy loss caused by collision. The motor has a rotor shaft, and the impeller 6 is installed at the head of the rotor shaft. The impeller 6 and the rotor shaft are fixed circumferentially by keys and driven to rotate by the rotor shaft. The impeller is axially fixed to the head of the rotor shaft by fasteners.

[0027] The mixed flow pump guide formed by the interference fit installation of the shell 1 formed by stamping of stainless steel pipe material and the guide wheel 2 formed by plastic injection molding reduces the casting process, shortens the production cycle and improves the production efficiency; the outer circumference of the circular ring mounting part 1 211 and the circular ring mounting part 212 is interference fit with the inner circumference of the shell 1, and the circular ring mounting part 1 211 and the circular ring mounting part 212 are smoothly connected by the curved surface part 213, and the curved surface part 213 is curved and has a gap with the inner wall of the shell 1. This arrangement is due to the interference fit between the guide wheel 2 and the shell 1, the guide wheel 2 has a certain height, and the setting of the middle gap is conducive to installing the guide wheel 2 into the shell 1, which is convenient for installation; in order to ensure that the guide wheel 2 of the plastic part can maintain long-term use without failure such as environmental stress cracking and fatigue, the stainless steel shell 1 is interference pressed on the outside of the plastic guide wheel 2, so that they are rigidly supported to avoid the plastic guide from being subjected to pressure, thereby improving product quality. The impeller 6 sucks in the external fluid. The wide-mouth channel 215 where the impeller 6 is installed is relatively large, which is conducive to increasing the amount of water sucked in. Above the impeller 6 is a flow channel composed of guide blades 22. The guide blades 22 are arranged in the narrow-mouth channel 214. The fluid sucked in by the impeller 6 is transported from the large space to the small space of the guide blades 22, which reduces the flow speed of the fluid, increases the pressure of the fluid, ensures the efficient operation of the water pump, and improves the product quality.

[0028] The housing 1 includes a cylindrical portion 11 and a circular plate 12 disposed at the upper end of the cylindrical portion 11 and protruding inwardly. The circular plate 12 has a plurality of through holes 13 evenly distributed in the circumference. The circular mounting portion 211 has an injection molded insert 3 evenly distributed in the circumference. The injection molded insert 3 corresponds to the through holes 13 one by one. The injection molded insert 3 is a copper insert with a threaded hole. The water outlet node is fixed above the guide wheel 2 by bolts. The bolts pass through the through holes 13 and are threadedly matched with the injection molded insert 3. The upper end surface of the injection molded insert 3 is higher than the upper end surface of the circular mounting portion 211, and the upper end surface of the injection molded insert 3 abuts against the lower end surface of the circular plate 12. A sealing gasket can be placed between the circular mounting portion 211 and the circular plate 12 for sealing.

[0029] The second circular mounting part 212 has a plurality of injection molded inserts 4 evenly distributed around the circumference. A cover plate 5 is provided below the second circular mounting part 212. The lower part of the impeller 6 extends into the cover plate 5. The impeller 6 rotates relative to the cover plate 5. The cover plate 5 has mounting holes corresponding to the second injection molded inserts 4. Bolts pass through the mounting holes and the second injection molded inserts 4 to fix the cover plate 5 below the guide wheel 2. A sealing gasket can be placed between the second circular mounting part 212 and the cover plate 5 for sealing.

[0030] The inner diameter of the annular plate 12 is larger than the diameter of the upper port of the annular mounting portion 211 , and the cover plate 5 has a central through hole for matching the lower part of the impeller 6 .

[0031] The guide parts of stainless steel castings need to be machined and drilled, and the requirements for tools and drill bits are also very high. There is a certain amount of use loss, which invisibly increases the processing cost. The outer size accuracy of the stamped shell 1 can achieve no processing, and the injection molded copper insert is used, so there is no need to drill and tap on the guide parts. When the guide wheel 2 is injected, the temperature, pressure and other process conditions are adjusted, and the guide wheel 2 will not be short of material, which facilitates processing and production while reducing costs.

[0032] The upper part of the mixed flow pump guide is fixedly connected to the water outlet node 7, and the lower part is fixedly connected to the cover plate 5. The upper end surface of the annular plate 12 abuts against the lower end surface of the water outlet node 7, so that the stainless steel shell 1 bears the pressure of connecting to the water outlet node 7 and protects the plastic guide wheel 2; the cover plate 5 has an outwardly protruding mounting platform 51, and the bottom surface of the cylindrical portion 11 abuts against the upper end surface of the mounting platform 51, so that the stainless steel shell 1 bears the pressure of connecting to the cover plate 5 and protects the plastic guide wheel 2.

[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 mixed flow pump guide member, comprising a housing (1) and a guide wheel (2) arranged in the housing (1), characterized in that: The outer shell (1) is formed by stamping of a stainless steel pipe material, and the guide wheel (2) is integrally formed of plastic. The guide wheel (2) comprises a volute (21), a plurality of guide blades (22) and a hub (23) which are connected in sequence from the outside to the inside. The upper portion of the volute (21) comprises an outwardly protruding annular mounting portion 1 (211), and the lower portion comprises an annular mounting portion 2 (212) having a diameter equivalent to the outer circumference of the annular mounting portion 1 (211). The volute (21) further comprises a curved surface portion (213) which smoothly connects the annular mounting portion 1 (211) and the annular mounting portion 2 (212). The outer circumference diameters of the curved surface portion (213) are smaller than the outer circumference diameters of the annular mounting portion 1 (211) and the annular mounting portion 2 (212). The outer circumferences of the annular mounting portion 1 (211) and the annular mounting portion 2 (212) are interference fit with the inner circumference of the outer shell (1).

2. A mixed flow pump guide according to claim 1, characterized in that: The curved surface portion (213) has a narrow passage (214) and a wide passage (215) that transition smoothly to each other. The hub (23) is connected to the guide blades (22) and is arranged in the narrow passage (214). The wide passage (215) has an impeller (6) installed therein. The impeller (6) is arranged coaxially with the hub (23).

3. A mixed flow pump guide according to claim 2, characterized in that: The hub (23) is in the shape of a hollow cone, the guide blades (22) are spirally arranged evenly in the circumferential direction outside the hub (23), and the other end is connected to the volute (21), and a water flow channel is formed between every two adjacent guide blades (22).

4. A mixed flow pump guide according to claim 2 or 3, characterized in that: The housing (1) comprises a cylindrical portion (11) and a circular plate (12) arranged at the upper end of the cylindrical portion (11) and protruding inwardly, the circular plate (12) having a plurality of through holes (13) evenly distributed in the circumference, and the circular mounting portion (211) having injection molded inserts (3) evenly distributed in the circumference, the injection molded inserts (3) corresponding one to one with the through holes (13).

5. A mixed flow pump guide according to claim 4, characterized in that: The upper end surface of the injection molded insert one (3) is higher than the upper end surface of the circular ring mounting portion one (211), and the upper end surface of the injection molded insert one (3) abuts against the lower end surface of the circular ring plate (12).

6. A mixed flow pump guide according to claim 4, characterized in that: The second annular mounting portion (212) is evenly distributed with a plurality of second injection molded inserts (4) in the circumferential direction; a cover plate (5) is arranged below the cylindrical portion (11); the cover plate (5) has a mounting platform (51) protruding outward; the bottom surface of the cylindrical portion (11) abuts against the upper end surface of the mounting platform (51); the lower portion of the impeller (6) extends into the cover plate (5); the impeller (6) rotates relative to the cover plate (5); and the cover plate (5) has mounting holes corresponding one to one to the second injection molded inserts (4).

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