Shaft sleeve structure of a submersible pump and its processing technology

Abstract

The present invention belongs to the technical field of water pumps, and particularly relates to a shaft sleeve structure of a submersible pump and its processing technology. It includes a ceramic shaft sleeve with an inner hole. A covering member is provided on the ceramic shaft sleeve. The covering member is made of plastic and has a tensile strength greater than 100 MPa. The covering member includes an upper covering member arranged above the ceramic shaft sleeve, a lower covering member arranged below the ceramic shaft sleeve, and an inner covering member arranged inside the inner hole. The upper end of the inner covering member is connected to the upper covering member, and the lower end is connected to the lower covering member. A hexagonal hole adapted to a hexagonal shaft is provided in the middle of the covering member. The present invention can effectively avoid local stress on the ceramic shaft sleeve and effectively prevent the ceramic shaft sleeve from cracking during the operation of the submersible pump.

Description

Technical Field

[0001] The present invention belongs to the technical field of water pumps, and particularly relates to a shaft sleeve structure of a submersible pump and its processing technology. Background Art

[0002] The bearings of existing well submersible pumps are assembled with ceramics and rubber. As Figures 1-3 shown, the rubber bearing 1 is tightly fixed to the bearing seat 2, and the ceramic shaft sleeve 3 is assembled on the hexagonal shaft 4. When the product operates, the shaft sleeve 3 and the hexagonal shaft 4 rotate together.

[0003] The number of impeller stages of well submersible pumps can reach up to 80. One bearing 1 needs to be set at intervals of a certain number of impellers. In this way, it is not possible to well ensure the coaxiality of each bearing 1. When the product operates, some bearings 1 bear a large radial force, and it is also not possible to ensure the perpendicularity of each bearing 1. When the product operates, the hexagonal shaft 4 vibrates, and there is a situation of local stress on the bearing 1. Since the inner hole of the shaft sleeve 3 is an inner hexagonal structure, the wall thickness of each corner 5 is the thinnest, which is the weak point of the shaft sleeve 3. Moreover, ceramics are brittle materials without toughness. When the water pump operates, the weak point bears the transmission force, and with the knocking of the vibration force, the shaft sleeve 3 is prone to cracking, thus causing damage to the submersible pump. Summary of the Invention

[0004] The purpose of the present invention is to provide a shaft sleeve structure of a submersible pump and its processing technology, which can effectively avoid local stress on the ceramic shaft sleeve and effectively prevent the ceramic shaft sleeve from cracking when the submersible pump operates.

[0005] The present invention is implemented as follows:

[0006] One of the purposes of the present invention is to provide a shaft sleeve structure of a submersible pump, including a ceramic shaft sleeve with an inner hole. A coating member is provided on the ceramic shaft sleeve. The coating member is made of plastic and has a tensile strength greater than 100 MPa. The coating member includes an upper coating member provided above the ceramic shaft sleeve, a lower coating member provided below the ceramic shaft sleeve, and an inner coating member provided in the inner hole. The upper end of the inner coating member is connected to the upper coating member, and the lower end is connected to the lower coating member. A hexagonal hole adapted to the hexagonal shaft is provided in the middle of the coating member.

[0007] In the above shaft sleeve structure of a submersible pump, the coating member is integrally injection-molded on the ceramic shaft sleeve.

[0008] In the above shaft sleeve structure of a submersible pump, the plastic is PPO (polyphenylene oxide), PC (polycarbonate), or POM (polyoxymethylene).

[0009] In the above shaft sleeve structure of a submersible pump, convex platforms are respectively provided at the upper and lower ends of the ceramic shaft sleeve, and grooves are formed at the convex platforms of the coating member.

[0010] In the above shaft sleeve structure of a submersible pump, a plurality of the convex platforms and the grooves are respectively circumferentially and uniformly distributed.

[0011] In the above shaft sleeve structure of a submersible pump, the outer diameters of the upper covering part and the lower covering part are the same as and coaxial with the outer diameter of the ceramic shaft sleeve. The lower end surface of the upper covering part is closely attached to the upper end surface of the ceramic shaft sleeve, and the upper end surface of the lower covering part is closely attached to the lower end surface of the ceramic shaft sleeve. The inner hole is a hexagonal hole.

[0012] Another object of the present invention is to provide a processing technology for the shaft sleeve structure of a submersible pump, including the following steps:

[0013] Step 1: Manufacture a ceramic shaft sleeve;

[0014] Step 2: Place the ceramic shaft sleeve into an injection mold;

[0015] Step 3: Start a two-color injection molding machine, and injection mold a protective sleeve wrapping the ceramic shaft sleeve on the outer circle of the ceramic shaft sleeve;

[0016] Step 4: Start the two-color injection molding machine again, and injection mold a covering part on the ceramic shaft sleeve;

[0017] Step 5: Open the injection mold, and take out the ceramic shaft sleeve formed with the protective sleeve and the covering part;

[0018] Step 6: Disassemble the protective sleeve.

[0019] In the above processing technology for the shaft sleeve structure of a submersible pump, the protective sleeve includes a left semi-circular sleeve wrapping the left half of the ceramic shaft sleeve and a right semi-circular sleeve wrapping the right half of the ceramic shaft sleeve. And gaps are respectively left between the two ends of the left semi-circular sleeve and the corresponding ends of the right semi-circular sleeve to form two notches one. An inlet well connecting the left semi-circular sleeve and the right semi-circular sleeve is provided at one of the notches one. A left semi-circular block is provided at the end of the left semi-circular sleeve far from the inlet well, and a right semi-circular block is provided at the end of the right semi-circular sleeve far from the inlet well. A through hole for the tapered end of a crowbar to extend into is formed between the left semi-circular block and the right semi-circular block. And gaps are respectively left between the two ends of the left semi-circular block and the corresponding ends of the right semi-circular block to form two notches two.

[0020] In the above processing technology for the shaft sleeve structure of a submersible pump, the two notches one are oppositely arranged, and the inlet well is located at the middle position of the axial dimension of the notch one.

[0021] In the above processing technology for the shaft sleeve structure of a submersible pump, the diameter of the through hole is 3 - 10 mm.

[0022] In the above processing technology for the shaft sleeve structure of a submersible pump, the thickness T2 of the left semi-circular sleeve and the right semi-circular sleeve is 1 - 3 mm, and the thickness T3 of the left semi-circular block and the right semi-circular block is 1 - 3 mm.

[0023] In the processing technology of the shaft sleeve structure of the submersible pump described above, the thicknesses T1 at the joints of the feed well with the left semi-circular block and with the right semi-circular block are respectively 1 - 2 mm.

[0024] In the processing technology of the shaft sleeve structure of the submersible pump described above, in step six, the protective sleeve is disassembled by inserting the tapered end of a crowbar into the through hole, forcing the left semi-circular block and the right semi-circular block to separate to both sides, and further forcing the left semi-circular sleeve and the right semi-circular sleeve to separate to both sides. The left semi-circular sleeve and the right semi-circular sleeve leave the outer circle of the ceramic shaft sleeve, and the ceramic shaft sleeve is taken out.

[0025] In the processing technology of the shaft sleeve structure of the submersible pump described above, the height of the protective sleeve is lower than that of the ceramic shaft sleeve, and neither the upper nor the lower ends of the protective sleeve are connected to the covering member.

[0026] In the processing technology of the shaft sleeve structure of the submersible pump described above, the distance S1 between the upper end face of the protective sleeve and the upper end face of the ceramic shaft sleeve is 0.5 - 2.5 mm, and the distance S2 between the lower end face of the protective sleeve and the lower end face of the ceramic shaft sleeve is 0.5 - 2.5 mm.

[0027] In the processing technology of the shaft sleeve structure of the submersible pump described above, the material of the protective sleeve is plastic.

[0028] The prominent advantages of the present invention compared with the prior art are:

[0029] 1. In the present invention, an inner covering member is arranged in the inner hole of the ceramic shaft sleeve, an upper covering member is arranged above the ceramic shaft sleeve, and a lower covering member is arranged below the ceramic shaft sleeve. The upper end of the inner covering member is connected to the upper covering member, and the lower end is connected to the lower covering member. The ceramic shaft sleeve does not directly contact the hexagonal shaft. At the same time, the covering member made of plastic has a tensile strength greater than 100 MPa, has good toughness, and can withstand various torques. When the submersible pump operates, various forces are transmitted from the hexagonal shaft to the covering member, and then from the covering member to the ceramic shaft sleeve, avoiding local stress on the ceramic shaft sleeve and effectively preventing the ceramic shaft sleeve from cracking during the operation of the submersible pump;

[0030] 2. In the present invention, a protective sleeve for wrapping the ceramic shaft is first injection-molded on the outer circle of the ceramic shaft sleeve to wrap the ceramic shaft sleeve, enabling the ceramic shaft sleeve to withstand the injection pressure of the injection-molded covering member, thereby effectively preventing the ceramic shaft sleeve from cracking during the processing, reducing the production cost, and improving the production efficiency;

[0031] 3. The protective cover of the present invention includes a left semi-circular sleeve that wraps the left half of the ceramic bushing and a right semi-circular sleeve that wraps the right half of the ceramic bushing. There are gaps between the corresponding ends of the left semi-circular sleeve and the right semi-circular sleeve at both ends, forming two notches one. At one of the notches one, there is a feed well connecting the left semi-circular sleeve and the right semi-circular sleeve. The end of the left semi-circular sleeve away from the feed well is provided with a left semi-circular block, and the end of the right semi-circular sleeve away from the feed well is provided with a right semi-circular block. A through hole is formed between the left semi-circular block and the right semi-circular block for the tapered end of the crowbar to extend into. There are gaps between the two ends of the left semi-circular block and the corresponding ends of the right semi-circular block, forming two notches two. While effectively protecting the ceramic bushing, it is convenient to disassemble the protective cover in step six. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a cross-sectional view of the prior art;

[0033] Figure 2 is a top view of the bushing of the prior art;

[0034] Figure 3 is a cross-sectional view of the bushing of the prior art;

[0035] Figure 4 is a cross-sectional view of the present invention;

[0036] Figure 5 is a top view of the present invention;

[0037] Figure 6 is a perspective view of the ceramic bushing of the present invention;

[0038] Figure 7 is a perspective view of the covering member of the present invention;

[0039] Figure 8 is a perspective view of the ceramic bushing and the protective cover of the present invention;

[0040] Figure 9 is a left view of the ceramic bushing and the protective cover of the present invention;

[0041] Figure 10 is a perspective view of the protective cover of the present invention;

[0042] Figure 11 is a top view of the protective cover of the present invention;

[0043] Figure 12 is a front view of the crowbar of the present invention.

[0044] REFERENCE NUMERALS:

[0045] Figures 1-3 In the figures: 1, bearing; 2, bearing seat; 3, bushing; 4, hexagonal shaft; 5, angle.

[0046] Figures 4-12 Among them: 11. Inner hole; 12. Ceramic bushing; 13. Cladding; 131. Upper cladding; 132. Lower cladding; 133. Inner cladding; 14. Hexagonal hole; 15. Boss; 16. Groove; 17. Protective sleeve; 171. Left semi-circular sleeve; 172. Right semi-circular sleeve; 18. Notch 1; 19. Feed well; 20. Left semi-circular block; 21. Right semi-circular block; 22. Crowbar; 23. Through hole; 24. Notch 2. Specific embodiments

[0047] The present invention will be further described below with specific embodiments. Refer to Figure 4 —12:

[0048] One of the objects of the present invention is to provide a bushing structure for a submersible pump, including a ceramic bushing 12 having an inner hole 11. The ceramic bushing 12 is provided with a cladding 13 made of plastic and having a tensile strength greater than 100 MPa. The cladding 13 includes an upper cladding 131 disposed above the ceramic bushing 12, a lower cladding 132 disposed below the ceramic bushing 12, and an inner cladding 133 disposed within the inner hole 11. The upper end of the inner cladding 133 is connected to the upper cladding 131, and the lower end is connected to the lower cladding 132. The middle of the cladding 13 is provided with a hexagonal hole 14 adapted to a hexagonal shaft.

[0049] As Figures 4-7 shown, the present invention provides an inner cladding 133 within the inner hole 11 of the ceramic bushing 12, an upper cladding 131 above the ceramic bushing 12, and a lower cladding 132 below the ceramic bushing 12. The upper end of the inner cladding 133 is connected to the upper cladding 131, and the lower end is connected to the lower cladding 132. The ceramic bushing 12 does not directly contact the hexagonal shaft. At the same time, the cladding 13 made of plastic has a tensile strength greater than 100 MPa and good toughness, and can withstand various torques. When the submersible pump operates, various forces are transmitted from the hexagonal shaft to the cladding 13, and then from the cladding 13 to the ceramic bushing 12, avoiding local stress on the ceramic bushing 12 and effectively preventing the ceramic bushing 12 from cracking during the operation of the submersible pump.

[0050] Furthermore, the cladding 13 is integrally formed on the ceramic bushing 12 by injection molding.

[0051] Preferably, the plastic is PPO (polyphenylene ether), PC (polycarbonate), or POM (polyoxymethylene).

[0052] To better transmit the force transmitted from the hexagonal shaft to the cladding 13 to the ceramic bushing 12, as Figure 6 , 7 shown, bosses 15 are respectively provided at the upper and lower ends of the ceramic bushing 12, and the cladding 13 forms grooves 16 at the bosses 15.

[0053] Furthermore, a plurality of the bosses 15 and grooves 16 are respectively circumferentially and uniformly distributed. In this embodiment, 12 bosses 15 and grooves 16 are respectively circumferentially and uniformly distributed.

[0054] Specific structure of the covering member 13: As Figures 4-7 shown, the outer diameters of the upper covering member 131 and the lower covering member 132 are the same as and coaxial with the outer diameter of the ceramic bushing 12. The lower end surface of the upper covering member 131 is in close contact with the upper end surface of the ceramic bushing 12, and the upper end surface of the lower covering member 132 is in close contact with the lower end surface of the ceramic bushing 12. The inner hole 11 is a hexagonal hole.

[0055] The present invention can greatly improve the service life of the bushing, thereby enabling the service life of the submersible pump to be extended by more than 5 times and the product failure rate to be reduced by 30%.

[0056] Another object of the present invention is to provide a processing technology for the bushing structure of a submersible pump, including the following steps:

[0057] Step 1, fabricate the ceramic bushing 12;

[0058] Step 2, place the ceramic bushing 12 into an injection mold;

[0059] Step 3, start a two-color injection molding machine, and injection mold a protective sleeve 17 that wraps the ceramic bushing 12 on the outer circle of the ceramic bushing 12;

[0060] Step 4, start the two-color injection molding machine again, and injection mold the covering member 13 on the ceramic bushing 12;

[0061] Step 5, open the injection mold, and take out the ceramic bushing 12 formed with the protective sleeve 17 and the covering member 13;

[0062] Step 6, disassemble the protective sleeve 17.

[0063] The present invention first injection molds the protective sleeve 17 that wraps the ceramic bushing 12 on the outer circle of the ceramic bushing 12, and then injection molds the covering member 13 on the ceramic bushing 12.

[0064] During the processing, since the ceramic bushing 12 is made of ceramic material and has no toughness and cannot withstand the injection pressure when injecting the covering member 13, therefore, as Figures 4-11 shown, the present invention first injection molds the protective sleeve 17 that wraps the ceramic bushing 12 on the outer circle of the ceramic bushing 12 to wrap the ceramic bushing 12, so that the ceramic bushing 12 can withstand the injection pressure of injecting the covering member 13, thereby effectively preventing the ceramic bushing 12 from cracking during the process of injecting the covering member 13, reducing the production cost, and improving the production efficiency.

[0065] Structure of the protective sleeve 17: As Figures 8-11As shown, the protective sleeve 17 includes a left semi-circular sleeve 171 that wraps around the left half of the ceramic bushing 12 and a right semi-circular sleeve 172 that wraps around the right half of the ceramic bushing 12. There are gaps between the corresponding ends of the left semi-circular sleeve 171 and the right semi-circular sleeve 172 at both ends, forming two first notches 18. At one of the first notches 18, there is a feed well 19 connecting the left semi-circular sleeve 171 and the right semi-circular sleeve 172. At the end of the left semi-circular sleeve 171 away from the feed well 19, there is a left semi-circular block 20, and at the end of the right semi-circular sleeve 172 away from the feed well 19, there is a right semi-circular block 21. A through hole 23 is formed between the left semi-circular block 20 and the right semi-circular block 21 for the tapered end of the crowbar 22 to extend into. There are gaps between the two ends of the left semi-circular block 20 and the corresponding ends of the right semi-circular block 21, forming two second notches 24. While effectively protecting the ceramic bushing 12, it is convenient to disassemble the protective sleeve 17 in step six.

[0066] To facilitate the disassembly of the protective sleeve 17, the two first notches 18 are arranged oppositely, and the feed well 19 is located at the middle position of the axial dimension of the first notch 18.

[0067] Furthermore, the diameter of the through hole 23 is 3 - 10 mm. In this embodiment, the diameter of the through hole 23 is 5 mm.

[0068] To have sufficient thickness to protect the ceramic bushing 12 while facilitating the disassembly of the protective sleeve 17, as Figures 8-11 shown, the thickness T2 of the left semi-circular sleeve 171 and the right semi-circular sleeve 172 is 1 - 3 mm, and the thickness T3 of the left semi-circular block 20 and the right semi-circular block 21 is 1 - 3 mm. In this embodiment, the thickness T2 of the left semi-circular sleeve 171 and the right semi-circular sleeve 172 is 2 mm, and the thickness T3 of the left semi-circular block 20 and the right semi-circular block 21 is 2 mm.

[0069] To ensure that the plastic can be smoothly injected into the mold cavity while minimizing the shear strength as much as possible to ensure that the protective sleeve 17 can be smoothly peeled off, as Figures 8-11 shown, the thicknesses T1 at the connection of the feed well 19 to the left semi-circular block 20 and at the connection to the right semi-circular block 21 are 1 - 2 mm respectively. In this embodiment, the thicknesses T1 at the connection of the feed well 19 to the left semi-circular block 20 and at the connection to the right semi-circular block 21 are 1 mm respectively.

[0070] Furthermore, in step six, the method of disassembling the protective sleeve 17 is to insert the tapered end of the crowbar 22 into the through hole 23, forcing the left semi-circular block 20 and the right semi-circular block 21 to separate to both sides, and then forcing the left semi-circular sleeve 171 and the right semi-circular sleeve 172 to separate to both sides. The left semi-circular sleeve 171 and the right semi-circular sleeve 172 leave the outer circle of the ceramic bushing 12, and the ceramic bushing 12 is taken out, and the protective sleeve 17 is convenient to disassemble.

[0071] In this embodiment, during the process of the left semi-circular sleeve 171 and the right semi-circular sleeve 172 separating from each other to both sides, the feed well 19 will break.

[0072] To facilitate the peeling of the protective sleeve 17, as Figure 8 , 9 shown, the height of the protective sleeve 17 is lower than the height of the ceramic bushing 12, and neither the upper nor the lower ends of the protective sleeve 17 are connected to the covering member 13.

[0073] To facilitate the removal of the protective sleeve 17 while effectively protecting the ceramic bushing 12, as Figure 8 , 9 shown, the distance S1 between the upper end face of the protective sleeve 17 and the upper end face of the ceramic bushing 12 is 0.5 - 2.5 mm, and the distance S2 between the lower end face of the protective sleeve 17 and the lower end face of the ceramic bushing 12 is 0.5 - 2.5 mm. In this embodiment, both the distance S1 between the upper end face of the protective sleeve 17 and the upper end face of the ceramic bushing 12 and the distance S2 between the lower end face of the protective sleeve 17 and the lower end face of the ceramic bushing 12 are 2 mm.

[0074] Furthermore, the material of the protective sleeve 17 is plastic.

[0075] The above embodiments are only some of the preferred embodiments of the present invention, and are not intended to limit the scope of implementation of the present invention. Therefore, all equivalent changes made according to the shape, structure, and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. A processing technology for the shaft sleeve structure of a submersible pump, characterized in that: The bushing structure includes a ceramic bushing (12) having an inner hole (11). A covering member (13) is provided on the ceramic bushing (12). The covering member (13) is made of plastic and has a tensile strength greater than 100 MPa. The covering member (13) includes an upper covering member (131) provided above the ceramic bushing (12), a lower covering member (132) provided below the ceramic bushing (12), and an inner covering member (133) provided inside the inner hole (11). The upper end of the inner covering member (133) is connected to the upper covering member (131), and the lower end is connected to the lower covering member (132). A hexagonal hole (14) adapted to a hexagonal shaft is provided in the middle of the covering member (13). The processing technology includes the following steps: Step 1: Manufacture the ceramic bushing (12); Step 2: Place the ceramic bushing (12) into an injection mold; Step 3: Start a two-color injection molding machine and injection mold a protective sleeve (17) that wraps the ceramic bushing (12) on the outer circle of the ceramic bushing (12); Step 4: Start the two-color injection molding machine again and injection mold the covering member (13) on the ceramic bushing (12); Step 5: Open the injection mold and take out the ceramic bushing (12) formed with the protective sleeve (17) and the covering member (13); Step 6: Remove the protective sleeve (17); The protective sleeve (17) includes a left semi-circular sleeve (171) that wraps the left half of the ceramic bushing (12) and a right semi-circular sleeve (172) that wraps the right half of the ceramic bushing (12). And gaps are respectively left between the two ends of the left semi-circular sleeve (171) and the corresponding ends of the right semi-circular sleeve (172) to form two notches one (18). An inlet well (19) connecting the left semi-circular sleeve (171) and the right semi-circular sleeve (172) is provided at one of the notches one (18). A left semi-circular block (20) is provided at the end of the left semi-circular sleeve (171) away from the inlet well (19), and a right semi-circular block (21) is provided at the end of the right semi-circular sleeve (172) away from the inlet well (19). A through hole (23) for the tapered end of a crowbar (22) to extend into is formed between the left semi-circular block (20) and the right semi-circular block (21). And gaps are respectively left between the two ends of the left semi-circular block (20) and the corresponding ends of the right semi-circular block (21) to form two notches two (24).

2. The processing technology of a shaft sleeve structure of a submersible pump according to claim 1, characterized in that: The thicknesses of the connections between the inlet well (19) and the left semi-circular block (20) and between the inlet well (19) and the right semi-circular block (21) are respectively 1 - 2 mm.

3. The processing technology of the shaft sleeve structure of a submersible pump according to claim 1, characterized in that: In Step 6, the method of removing the protective sleeve (17) is to insert the tapered end of the crowbar (22) into the through hole (23), force the left semi-circular block (20) and the right semi-circular block (21) to separate to both sides, and then force the left semi-circular sleeve (171) and the right semi-circular sleeve (172) to separate to both sides. The left semi-circular sleeve (171) and the right semi-circular sleeve (172) leave the outer circle of the ceramic bushing (12), and the ceramic bushing (12) is taken out.

4. The processing technology of the shaft sleeve structure of a submersible pump according to claim 1, characterized in that: The height of the protective sleeve (17) is lower than the height of the ceramic bushing (12), and neither the upper end nor the lower end of the protective sleeve (17) is connected to the covering member (13).

5. The processing technology of a shaft sleeve structure of a submersible pump according to claim 4, characterized in that: The distance between the upper end face of the protective sleeve (17) and the upper end face of the ceramic bushing (12) is 0.5 - 2.5 mm, and the distance between the lower end face of the protective sleeve (17) and the lower end face of the ceramic bushing (12) is 0.5 - 2.5 mm.

6. The processing technology of a shaft sleeve structure of a submersible pump according to claim 1, characterized in that: The covering member (13) is integrally formed on the ceramic bushing (12) by injection molding.

7. The processing technology of a shaft sleeve structure of a submersible pump according to claim 6, characterized in that: The upper and lower ends of the ceramic bushing (12) are respectively provided with bosses (15), and the covering member (13) forms grooves (16) at the bosses (15).

8. The processing technology of a shaft sleeve structure of a submersible pump according to claim 1, characterized in that: The outer diameters of the outer circles of the upper covering member (131) and the lower covering member (132) are the same as and coaxial with the outer diameter of the ceramic bushing (12). The lower end face of the upper covering member (131) is closely attached to the upper end face of the ceramic bushing (12), and the upper end face of the lower covering member (132) is closely attached to the lower end face of the ceramic bushing (12). The inner hole (11) is a hexagonal hole.

Images