Guide part of axial flow pump

Abstract

The utility model provides an axial flow pump guide piece, and belongs to the technical field of mechanical equipment. The technical problems that an existing axial flow pump guiding piece is inconvenient to machine, low in efficiency and the like are solved. The axial flow pump guide part comprises a shell and a guide wheel, the shell comprises a circular ring part, a cylinder part and a connecting part, the circular ring part and the cylinder part are formed by flanging a stainless steel pipe, the connecting part is fixedly welded to the cylinder part, the guide wheel is formed by plastic injection molding and comprises a volute, a plurality of blades and a hub, and the inner circumferential face of the cylinder part is in interference fit with the outer circumferential face of the volute. The water outlet section is provided with a flange part protruding outwards and fixedly connected with the circular ring part in an abutting mode, the lower end of the volute protrudes outwards to form a flange part, and the connecting part, the flange part and the water inlet connecting piece are fixed through a second fixing piece. The device is convenient to process and high in efficiency.

Description

Technical Field

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

[0002] The axial flow pump is filled with liquid. When the pump shaft is driven by the motor to rotate, it generates thrust on the liquid, causing the transported liquid to flow along the pump shaft direction and be discharged along the discharge pipe. When the liquid is pushed out, a local vacuum is formed at the original position. Under the action of atmospheric pressure, the liquid outside will be sucked into the impeller along the inlet pipe. Generally, an outlet guide vane is installed at the water outlet of the impeller of the axial flow pump. The outlet guide vane converts the kinetic energy of the fluid flowing out of the impeller into pressure energy, avoiding the impact loss and vortex loss caused by the rotation of the liquid.

[0003] At present, the outlet guide vanes that are similar to the existing technology are made of stainless steel sheet metal stamping parts and then welded into a whole, the assembly stoppers at both ends are machined, and then the screw holes for connection and fastening are processed. Since the blades of the outlet guide vanes have the characteristics of spatial shape distortion, the sheet metal stamping needs to be stamped and formed in multiple steps to ensure its dimensional accuracy, which affects the production efficiency to a certain extent. At the same time, due to the characteristics of spatial distortion, the welding position of the outlet guide vane is small, and the welding of the entire blade cannot be completed in one step. It needs to be welded in sections, which directly affects the welding quality of the blade. The stainless steel welding seam is in direct contact with high-speed flowing water. Long-term operation will cause corrosion, perforation and leakage at the weld, affecting the normal use function of the water pump. Summary of the invention

[0004] In view of the deficiencies in the prior art, the utility model aims to provide an axial flow pump guide.

[0005] The technical problem to be solved by the utility model is: how to facilitate the processing of the guide member of the axial flow pump, shorten the production cycle, improve the production efficiency and prevent leakage.

[0006] The purpose of the utility model can be achieved through the following technical solutions: an axial flow pump guide, the axial flow pump includes a water outlet section and a water inlet connecting piece, a guide piece is fixed between the water outlet section and the water inlet connecting piece, the guide piece includes an outer shell and a guide wheel arranged through the outer shell, the outer shell includes an annular portion and a cylindrical portion formed by flanging a stainless steel pipe, the outer shell also includes a connecting portion welded and fixed to the cylindrical portion, the guide wheel is plastic injection molding, the guide wheel is sequentially connected with a volute, a plurality of blades and a hub from the outside to the inside, the inner circumferential surface of the cylindrical portion is interference fit with the outer circumferential surface of the volute, the water outlet section has a flange portion protruding outward, the flange portion is fixed by a plurality of fixing members after abutting against the annular portion, the lower end of the volute has a flange portion protruding outward, the upper end surface of the flange portion abuts against the lower end of the connecting portion, the lower end surface of the flange portion abuts against the upper end surface of the water inlet connecting piece, the connecting portion, the flange portion and the water inlet connecting piece are fixed by a plurality of fixing members.

[0007] The guide member of the present scheme consists of an outer shell and a guide wheel. The outer shell is a circular ring part and a cylindrical part formed by flanging a stainless steel tube, and a connecting part is welded and fixed at the lower part of the cylindrical part. The guide wheel is formed by plastic injection molding, and the plastic guide wheel is pressed into the stainless steel outer shell by interference fit. The water outlet node is fixed against the circular ring part of the stainless steel outer shell, and the flange part is fixed between the water inlet connector and the connecting part, so that the guide wheel can be stably fixed and the force of the water outlet node and the water inlet connector can be applied to the stainless steel outer shell, thereby protecting the guide wheel and improving its service life. The guide wheel is formed by plastic injection molding in one step, and the process conditions such as temperature and pressure are adjusted well, so that the injection molded parts will not be short of material, and the geometric size accuracy can be effectively guaranteed, thereby improving production efficiency. The blades of the plastic injection molded guide wheel can also be well formed into a predetermined twisted shape to improve the water outlet pressure. The plastic guide wheel will not rust. The guide wheel protects the stainless steel shell from water. The stainless steel shell rigidly supports and protects the guide wheel, which reduces the leakage of the guide parts due to corrosion and perforation at the weld, and improves the quality of the product. The plastic molded guide wheel and the stainless steel pipe stamping molded shell are easy to process and install, shortening the production cycle and improving production efficiency. The guide wheel uses plastic parts of specific materials to maintain its long-term use without environmental stress cracking, fatigue and other failures.

[0008] Furthermore, the upper part of the flange is provided with a sealing groove 1 opening toward the connecting part, and a sealing ring is provided in the sealing groove 1, so as to prevent water from entering the gap between the guide wheel and the stainless steel shell, reduce rust on the weld of the stainless steel shell, and improve the service life.

[0009] Furthermore, the volute has a side wall that gradually thickens from top to bottom, and the flange is arranged at the lower end of the side wall in a step-like manner, so that the volute has a sufficiently large rigid part to support the entire guide wheel.

[0010] Furthermore, the upper part of the water inlet connecting piece has an annular block that cooperates with the step-shaped flange part and abuts against the flange part. The connecting part is formed by stamping and flanging a stainless steel sheet to have a flat ring plate and a vertical ring plate. The flat ring plate is sleeved on the lower end of the cylindrical part and welded and fixed to the cylindrical part. The second fixing part passes through the flat ring plate, the flange part and the annular block in sequence and fixes them.

[0011] Furthermore, the upper end surface of the annular portion is higher than the upper end surface of the side wall, the inner circumferential surface diameter of the water outlet joint is smaller than the inner circumferential surface diameter of the annular portion, the upper end surface of the side wall, the inner circumferential surface of the annular portion and the lower end surface of the water outlet joint form a second sealing groove, and a sealing gasket is arranged in the second sealing groove to prevent water from entering the gap between the guide wheel and the stainless steel shell, reduce rust on the weld of the stainless steel shell, and increase the service life.

[0012] Furthermore, the blades and the hub are located at the upper part of the volute, and the blades divide the gap between the volute and the hub into a plurality of water passages. An impeller is arranged at the lower part of the volute, and the impeller is arranged coaxially with the hub. The impeller is connected to the motor through a rotating shaft, and the rotating shaft drives the impeller to rotate. The impeller transports the water in the water inlet connector to the guide wheel volute, and the blades of the guide wheel convert the kinetic energy of the fluid into pressure energy.

[0013] Compared with the prior art, the technical effect of the utility model is as follows: the guide part is composed of a stainless steel shell assembled and welded by stamping parts and an injection-molded plastic guide wheel. The plastic guide wheel is press-fitted inside the stainless steel shell, which can avoid direct contact and stress between the plastic guide wheel and the water outlet section and the water inlet connector, thereby increasing the service life of the guide wheel.

[0014] The production and processing is carried out through the process of plastic injection molding, which reduces the processing difficulty; the plastic guide wheel is combined with the stainless steel shell to form a composite guide part, which shortens the production cycle and improves production efficiency; the guide wheel will not rust, which reduces the leakage due to corrosion and perforation at the weld and improves the quality of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The utility model is a cross-sectional view Figure 1 .

[0016] Figure 2 It is an AA enlarged view of the utility model.

[0017] Figure 3 It is an enlarged view of BB of the utility model.

[0018] Figure 4 It is a cross-sectional view of the utility model.

[0019] Figure 5 It is an exploded view of the utility model.

[0020] Figure 6 It is a stereogram of the utility model.

[0021] Figure number markings: 1. water outlet section; 11. flange part; 2. water inlet connector; 21. annular block; 3. guide member; 31. outer shell; 311. circular ring part; 312. cylindrical part; 313. connecting part; 3131. flat ring plate; 3132. vertical ring plate; 32. guide wheel; 321. volute; 3211. flange part; 3212. sealing groove 1; 3213. side wall; 322. blade; 323. hub; 4. fixing part 1; 5. fixing part 2; 6. sealing ring; 7. sealing groove 2; 8. sealing gasket; 9. impeller. DETAILED DESCRIPTION

[0022] 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.

[0023] according to Figures 1 to 6 As shown: an axial flow pump guide, the axial flow pump comprises a water outlet section 1 and a water inlet connecting member 2, and a guide member 3 is fixed between the water outlet section 1 and the water inlet connecting member 2.

[0024] The guide member 3 includes a housing 31 and a guide wheel 32 which is disposed through the housing 31 .

[0025] The housing 31 includes a circular ring portion 311, a cylindrical portion 312 and a connecting portion 313, wherein the connecting portion 313 also includes a flat ring plate 3131 and a vertical ring plate 3132. The circular ring portion 311 and the cylindrical portion 312 of the housing 31 are formed by flanging a stainless steel tube, and the flat ring plate 3131 and the vertical ring plate 3132 of the connecting portion 313 are formed by stamping and flanging a stainless steel sheet. The cylindrical portion 312 and the connecting portion 313 are welded and fixed, that is, the flat ring plate 3131 is sleeved on the lower end of the cylindrical portion 312 and is welded and fixed to the cylindrical portion 312.

[0026] The guide wheel 32 is plastic injection molded, and is sequentially connected with a volute 321, a plurality of blades 322 and a hub 323 from outside to inside. The inner circumference of the cylindrical portion 312 and the outer circumference of the volute 321 are interference-fitted so that the housing 31 and the guide wheel 32 are firmly fixed.

[0027] The blades 322 and the hub 323 are located at the upper part of the volute 321. The blades 322 divide the gap between the volute 321 and the hub 323 into a plurality of water passages. The impeller 9 is arranged at the lower part of the volute 321, and the impeller 9 is arranged coaxially with the hub 323. The impeller 9 is connected to the motor through a rotating shaft, and the rotating shaft drives the impeller 9 to rotate. The impeller 9 transports the water in the water inlet connector 2 to the volute 321 of the guide wheel 32, and the kinetic energy of the fluid is converted into pressure energy by the blades 322 of the guide wheel 32.

[0028] The water outlet section 1 has a flange portion 11 protruding outwards, and the flange portion 11 is fixed by a plurality of fixing members 4 after abutting against the annular portion 311 .

[0029] A flange portion 3211 protrudes outward from the lower end of the volute 321, and the upper end surface of the flange portion 3211 abuts against the lower end of the connecting portion 313, and the lower end surface of the flange portion 3211 abuts against the upper end surface of the water inlet connector 2. The connecting portion 313, the flange portion 3211 and the water inlet connector 2 are fixed by a plurality of fixing members 25.

[0030] The upper part of the flange part 3211 is provided with a sealing groove 3212 with an opening toward the connecting part 313, and a sealing ring 6 is provided in the sealing groove 3212 to prevent water from entering the gap between the guide wheel 32 and the stainless steel shell, reduce rust on the weld of the stainless steel shell, and improve the service life.

[0031] The volute 321 has a side wall 3213 that gradually thickens from top to bottom, and the flange portion 3211 is arranged at the lower end of the side wall 3213 in a stepped manner, so that the volute 321 has a sufficiently large rigid part to support the entire guide wheel 32.

[0032] The upper part of the water inlet connector 2 has an annular block 21 that fits against the stepped flange portion 3211. The flat ring plate 3131 is sleeved on the lower end of the cylindrical portion 312 and welded to the cylindrical portion 312. The fixing member 25 passes through the flat ring plate 3131, the flange portion 3211 and the annular block 21 in sequence and fixes them.

[0033] The upper end surface of the annular portion 311 is higher than the upper end surface of the side wall 3213, the inner diameter of the water outlet node 1 is smaller than the inner diameter of the annular portion 311, the upper end surface of the side wall 3213, the inner surface of the annular portion 311 and the lower end surface of the water outlet node 1 form a sealing groove 2 7, and a sealing gasket 8 is arranged in the sealing groove 2 7. This prevents water from entering the gap between the guide wheel 32 and the stainless steel shell, reduces rust on the weld of the stainless steel shell, and increases the service life.

[0034] The guide member 3 is composed of a shell 31 and a guide wheel 32. The shell 31 is a circular ring portion 311 and a cylindrical portion 312 formed by flanging a stainless steel tube. A connecting portion 313 is also welded and fixed at the lower part of the cylindrical portion 312. The guide wheel 32 is formed by plastic injection molding. The plastic guide wheel 32 is pressed into the stainless steel shell 31 through interference fit. The water outlet node 1 is fixed against the circular ring portion 311 of the stainless steel shell 31. The flange portion 3211 is fixed between the water inlet connector 2 and the connecting portion 313, so that the guide wheel 32 can be stably fixed and the force of the water outlet node 1 and the water inlet connector 2 can be applied to the stainless steel shell 31, thereby protecting the guide wheel 32 and improving its service life. The guide wheel 32 is formed by plastic injection molding at one time. The process conditions such as temperature and pressure are adjusted well. The injection molded parts will not be short of material, and the geometric dimensional accuracy can be effectively guaranteed, thereby improving production efficiency. The blades 322 of the plastic injection molded guide wheel 32 can also be well formed into a predetermined twisted shape to improve the water outlet pressure. The plastic guide wheel 32 will not rust either. The guide wheel 32 protects the stainless steel shell from water. The stainless steel shell 31 rigidly supports and protects the guide wheel 32, so that the guide member 3 reduces the leakage caused by corrosion and perforation at the weld and improves the quality of the product. The plastic molded guide wheel 32 and the stainless steel pipe stamping shell 31 are easy to process and install, shortening the production cycle and improving production efficiency.

[0035] 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. An axial flow pump guide member, the axial flow pump comprising a water outlet section (1) and a water inlet connection member (2), a guide member (3) being fixed between the water outlet section (1) and the water inlet connection member (2), characterized in that: The guide member (3) comprises a housing (31) and a guide wheel (32) which is arranged in the housing (31); the housing (31) comprises a circular ring portion (311) and a cylindrical portion (312) which are formed by flanging a stainless steel tube; the housing (31) further comprises a connecting portion (313) which is welded and fixed to the cylindrical portion (312); the guide wheel (32) is made of plastic injection molding; the guide wheel (32) is connected to a volute (321), a plurality of blades (322) and a hub (323) in sequence from the outside to the inside; the inner circumference of the cylindrical portion (312) is connected to the volute (321) and the inner circumference of the cylindrical portion (312) is connected to the volute (321). ) with interference fit on the outer peripheral surface, the water outlet joint (1) has a flange portion (11) protruding outwards, the flange portion (11) is fixed by a plurality of fixing members (4) after abutting against the annular portion (311), the lower end of the volute (321) protrudes outwards with a flange portion (3211), the upper end surface of the flange portion (3211) abuts against the lower end of the connecting portion (313), and the lower end surface of the flange portion (3211) abuts against the upper end surface of the water inlet connecting member (2), and the connecting portion (313), the flange portion (3211) and the water inlet connecting member (2) are fixed by a plurality of fixing members (5).

2. An axial flow pump guide according to claim 1, characterized in that: The upper portion of the flange portion (3211) is provided with a sealing groove (3212) opening toward the connecting portion (313), and a sealing ring (6) is provided in the sealing groove (3212).

3. An axial flow pump guide according to claim 2, characterized in that: The volute (321) has a side wall (3213) that gradually thickens from top to bottom, and the flange portion (3211) is arranged at the lower end of the side wall (3213) in a stepped manner.

4. An axial flow pump guide according to claim 3, characterized in that: The upper part of the water inlet connector (2) has an annular block (21) that is fitted and abutted against the step-shaped flange portion (3211); the connecting portion (313) is formed by stamping and flanging a stainless steel sheet material to have a flat ring plate (3131) and a vertical ring plate (3132); the flat ring plate (3131) is sleeved on the lower end of the cylindrical portion (312) and is welded and fixed to the cylindrical portion (312); the second fixing member (5) passes through the flat ring plate (3131), the flange portion (3211) and the annular block (21) in sequence and fixes them.

5. The axial flow pump guide according to claim 3, characterized in that: The upper end surface of the annular portion (311) is higher than the upper end surface of the side wall (3213); the inner circumferential surface diameter of the water outlet node (1) is smaller than the inner circumferential surface diameter of the annular portion (311); the upper end surface of the side wall (3213), the inner circumferential surface of the annular portion (311) and the lower end surface of the water outlet node (1) form a second sealing groove (7); a sealing gasket (8) is arranged in the second sealing groove (7).

6. An axial flow pump guide according to any one of claims 1 to 5, characterized in that: The blades (322) and the hub (323) are located at the upper part of the volute (321); the blades (322) divide the gap between the volute (321) and the hub (323) into a plurality of water passages; an impeller (9) is arranged at the lower part of the volute (321); the impeller (9) and the hub (323) are arranged coaxially.

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