Shaft sleeve structure of submersible pump and machining process of shaft sleeve structure

Abstract

The invention belongs to the technical field of water pumps, and particularly relates to a shaft sleeve structure of a submersible pump and a processing technology thereof.The shaft sleeve structure of the submersible pump comprises a ceramic shaft sleeve with an inner hole, the ceramic shaft sleeve is provided with a wrapping piece, the wrapping piece is made of plastic, and the tensile strength is larger than 100 MPa; the coating piece comprises an upper coating piece arranged above the ceramic shaft sleeve, a lower coating piece arranged below the ceramic shaft sleeve and an inner coating piece arranged in the inner hole, the upper end of the inner coating piece is connected with the upper coating piece, the lower end of the inner coating piece is connected with the lower coating piece, and a hexagonal hole matched with the hexagonal shaft is formed in the middle of the coating piece. Local stress of the ceramic shaft sleeve can be effectively avoided, and the ceramic shaft sleeve is effectively prevented from being broken when the submersible pump operates.

Description

Technical Field

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

[0002] The bearings of existing well submersible pumps are made of ceramic and rubber combinations, such as Figure 1-3 As shown, the bearing 1 made of rubber material is tightly fitted and fixed to the bearing seat 2, and the shaft sleeve 3 made of ceramic material is assembled on the hexagonal shaft 4. When the product is running, the shaft sleeve 3 and the hexagonal shaft 4 rotate together.

[0003] The number of impellers of well submersible pumps is as high as 80. A bearing 1 needs to be set for each impeller with a certain number of intervals. This cannot ensure the coaxiality of each bearing 1. When the product is running, some bearings 1 bear large radial forces, and the verticality of each bearing 1 cannot be guaranteed. When the product is running, the hexagonal shaft 4 vibrates, and the bearing 1 is locally stressed. Since the inner hole of the sleeve 3 is an inner hexagonal structure, the wall thickness of each corner 5 is the thinnest, which is the weak point of the sleeve 3. Ceramic is a brittle material with no toughness. When the water pump is running, the weak point is subjected to the transmission force, coupled with the knocking of the vibration force, the sleeve 3 is easy to break, thereby causing damage to the submersible pump. Summary of the invention

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

[0005] The present invention is achieved in that:

[0006] One of the objects of the present invention is to provide a sleeve structure of a submersible pump, comprising a ceramic sleeve with an inner hole, wherein a covering is provided on the ceramic sleeve, the covering is made of plastic and has a tensile strength greater than 100 MPa, the covering comprises an upper covering arranged above the ceramic sleeve, a lower covering arranged below the ceramic sleeve, and an inner covering arranged in the inner hole, the upper end of the inner covering is connected to the upper covering and the lower end is connected to the lower covering, and a hexagonal hole matching the hexagonal shaft is provided in the middle of the covering.

[0007] In the above-mentioned shaft sleeve structure of a submersible pump, the covering member is integrally formed on the ceramic shaft sleeve by injection molding.

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

[0009] In the above-mentioned shaft sleeve structure of a submersible pump, bosses are respectively provided at the upper and lower ends of the ceramic shaft sleeve, and the covering member forms a groove at the bosses.

[0010] In the above-mentioned shaft sleeve structure of a submersible pump, a plurality of the bosses and the grooves are evenly distributed around the circumference.

[0011] In the above-mentioned shaft sleeve structure of a submersible pump, the outer circles of the upper covering member and the lower covering member have the same diameter and are coaxial with the outer circle of the ceramic sleeve, the lower end face of the upper covering member is tightly against the upper end face of the ceramic sleeve, the upper end face of the lower covering member is tightly against the lower end face of the ceramic sleeve, and the inner hole is a hexagonal hole.

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

[0013] Step 1: Make a ceramic bushing;

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

[0015] Step 3: Start the two-color injection molding machine to injection mold a protective sleeve that wraps the ceramic sleeve on the outer ring of the ceramic sleeve;

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

[0017] Step 5, opening the injection mold and taking out the ceramic sleeve with the protective sleeve and the covering part;

[0018] Step 6: Remove the protective cover.

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

[0020] In the above-mentioned processing technology of the shaft sleeve structure of a submersible pump, the two notches are arranged opposite to each other, and the feed well is located in the middle position of the axial dimension of the notch.

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

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

[0023] In the above-mentioned processing technology of the shaft sleeve structure of a submersible pump, the thickness T1 of the connection between the feed well and the left semi-annular block and the connection between the feed well and the right semi-annular block is 1-2 mm respectively.

[0024] In the above-mentioned processing technology of the shaft sleeve structure of a submersible pump, in step six, the way to remove the protective sleeve is to insert the tapered end of the pry bar into the through hole, forcing the left semi-annular block and the right semi-annular block to separate to both sides, and then forcing the left semi-annular sleeve and the right semi-annular sleeve to separate to both sides, and the left semi-annular sleeve and the right semi-annular sleeve leave the outer circle of the ceramic sleeve, and take out the ceramic sleeve.

[0025] In the above-mentioned processing technology of the shaft sleeve structure of a submersible pump, the height of the protective sleeve is lower than the height of the ceramic shaft sleeve, and the upper and lower ends of the protective sleeve are not connected to the covering member.

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

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

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

[0029] 1. The present invention arranges an inner covering member in the inner hole of the ceramic sleeve, an upper covering member above the ceramic sleeve, and a lower covering member below the ceramic sleeve, and 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 sleeve does not directly contact the hexagonal shaft, and at the same time, the covering member made of plastic material has a tensile strength greater than 100MPa, has good toughness, and can withstand various torques. When the submersible pump is running, various forces are transmitted by the hexagonal axial covering member, and then transmitted by the covering member to the ceramic sleeve, so as to avoid local stress on the ceramic sleeve and effectively prevent the ceramic sleeve from breaking when the submersible pump is running;

[0030] 2. The present invention firstly injects a protective sleeve that wraps the ceramic shaft on the outer ring of the ceramic sleeve to wrap the ceramic sleeve, so that the ceramic sleeve can withstand the injection pressure of the injection-molded covering part, thereby effectively preventing the ceramic sleeve from breaking during the processing, reducing production costs and improving production efficiency;

[0031] 3. The protective sleeve of the present invention comprises a left semi-annular sleeve wrapping the left half of the ceramic sleeve and a right semi-annular sleeve wrapping the right half of the ceramic sleeve, and gaps are respectively left between the two ends of the left semi-annular sleeve and the corresponding ends of the right semi-annular sleeve to form two gaps one, and a feed well connecting the left semi-annular sleeve and the right semi-annular sleeve is provided at one of the gaps, a left semi-annular block is provided at the end of the left semi-annular sleeve away from the feed well, and a right semi-annular block is provided at the end of the right semi-annular sleeve away from the feed well, a through hole for the tapered end of the pry bar to extend into is formed between the left semi-annular block and the right semi-annular block, and gaps are respectively left between the two ends of the left semi-annular block and the corresponding ends of the right semi-annular block to form two gaps two, which can effectively protect the ceramic sleeve and facilitate the removal of the protective sleeve 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 a shaft sleeve of the prior art;

[0034] Figure 3 is a cross-sectional view of a shaft sleeve 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 three-dimensional diagram of a ceramic sleeve of the present invention;

[0038] Figure 7 is a three-dimensional view of the covering member of the present invention;

[0039] Figure 8 is a three-dimensional diagram of the ceramic sleeve and the protective sleeve of the present invention;

[0040] Fig. 9 It is a left side view of the ceramic sleeve and the protective sleeve of the present invention;

[0041] Fig.10 is a three-dimensional diagram of the protective cover of the present invention;

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

[0043] Fig.12 It is a front view of the pry bar of the present invention.

[0044] Reference numerals:

[0045] Figure 1-3 Middle: 1. bearing; 2. bearing seat; 3. sleeve; 4. hexagonal shaft; 5. angle.

[0046] Figure 4-12 Middle: 11, inner hole; 12, ceramic sleeve; 13, covering part; 131, upper covering part; 132, lower covering part; 133, inner covering part; 14, hexagonal hole; 15, boss; 16, groove; 17, protective sleeve; 171, left semi-annular sleeve; 172, right semi-annular sleeve; 18, notch one; 19, feed well; 20, left semi-annular block; 21, right semi-annular block; 22, pry bar; 23, through hole; 24, notch two. DETAILED DESCRIPTION

[0047] The present invention is further described below with reference to specific embodiments. Figure 4 —12:

[0048] One of the objects of the present invention is to provide a sleeve structure of a submersible pump, comprising a ceramic sleeve 12 having an inner hole 11, a covering 13 being provided on the ceramic sleeve 12, the covering 13 being made of plastic and having a tensile strength greater than 100 MPa, the covering 13 comprising an upper covering 131 arranged above the ceramic sleeve 12, a lower covering 132 arranged below the ceramic sleeve 12, and an inner covering 133 arranged in the inner hole 11, the upper end of the inner covering 133 being connected to the upper covering 131 and the lower end being connected to the lower covering 132, and a hexagonal hole 14 matching the hexagonal shaft being provided in the middle of the covering 13.

[0049] like Figure 4-7 As shown, the present invention arranges an inner covering member 133 in the inner hole 11 of the ceramic sleeve 12, an upper covering member 131 is arranged above the ceramic sleeve 12, and a lower covering member 132 is arranged below the ceramic sleeve 12, and 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, and the ceramic sleeve 12 is not in direct contact with the hexagonal shaft. At the same time, the tensile strength of the covering member 13 made of plastic material is greater than 100MPa, and it has good toughness and can withstand various torques. When the submersible pump is running, various forces are transmitted by the hexagonal axial covering member 13, and then transmitted to the ceramic sleeve 12 by the covering member 13, so as to avoid local force on the ceramic sleeve 12 and effectively prevent the ceramic sleeve 12 from breaking when the submersible pump is running.

[0050] Furthermore, the covering member 13 is integrally formed on the ceramic sleeve 12 by injection molding.

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

[0052] In order to better transmit the force transmitted from the hexagonal shaft to the covering member 13 to the ceramic sleeve 12, as Figure 6 , 7 As shown, the ceramic sleeve 12 is provided with bosses 15 at the upper and lower ends respectively, and the covering member 13 is formed with grooves 16 at the bosses 15 .

[0053] Furthermore, the bosses 15 and the grooves 16 are uniformly distributed on the circumference. In this embodiment, the bosses 15 and the grooves 16 are uniformly distributed on the circumference.

[0054] The specific structure of the covering member 13 is as follows: Figure 4-7 As shown, the outer circles of the upper covering member 131 and the lower covering member 132 have the same diameter and are coaxial with the outer circle of the ceramic sleeve 12, the lower end face of the upper covering member 131 is in close contact with the upper end face of the ceramic sleeve 12, the upper end face of the lower covering member 132 is in close contact with the lower end face of the ceramic sleeve 12, and the inner hole 11 is a hexagonal hole.

[0055] The present invention can greatly increase the service life of the shaft sleeve, thereby extending the service life of the submersible pump by more than 5 times and reducing the product failure rate by 30%.

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

[0057] Step 1: making a ceramic sleeve 12;

[0058] Step 2: Place the ceramic sleeve 12 into the injection mold;

[0059] Step 3: Start the two-color injection molding machine to injection mold the protective sleeve 17 that wraps the ceramic sleeve 12 on the outer ring of the ceramic sleeve 12;

[0060] Step 4: start the two-color injection molding machine again to injection mold the covering part 13 on the ceramic sleeve 12;

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

[0062] Step 6: Remove the protective cover 17.

[0063] In the present invention, the protective sleeve 17 wrapping the ceramic sleeve 12 is firstly injection-molded on the outer ring of the ceramic sleeve 12 , and then the covering part 13 is injection-molded on the ceramic sleeve 12 .

[0064] During the processing, since the ceramic sleeve 12 is made of ceramic material and has no toughness, it cannot withstand the injection molding pressure of the coating 13. Figure 4-11 As shown, the present invention firstly injection molds a protective sleeve 17 that wraps the ceramic sleeve 12 on the outer ring of the ceramic sleeve 12, so that the ceramic sleeve 12 can withstand the injection molding pressure of the injection molding coating 13, thereby effectively preventing the ceramic sleeve 12 from breaking during the injection molding process of the coating 13, thereby reducing production costs and improving production efficiency.

[0065] The structure of the protective cover 17 is as follows: Figure 8-11As shown, the protective sleeve 17 includes a left semi-annular sleeve 171 wrapping the left half of the ceramic sleeve 12 and a right semi-annular sleeve 172 wrapping the right half of the ceramic sleeve 12, and gaps are left between the two ends of the left semi-annular sleeve 171 and the ends corresponding to the right semi-annular sleeve 172 to form two gaps 18, and a feed well 19 connecting the left semi-annular sleeve 171 and the right semi-annular sleeve 172 is provided at one of the gaps 18, a left semi-annular block 20 is provided at the end of the left semi-annular sleeve 171 away from the feed well 19, and a right semi-annular block 21 is provided at the end of the right semi-annular sleeve 172 away from the feed well 19, a through hole 23 for the tapered end of the crowbar 22 to extend into is formed between the left semi-annular block 20 and the right semi-annular block 21, and gaps are left between the two ends of the left semi-annular block 20 and the ends corresponding to the right semi-annular block 21 to form two gaps 24, which can effectively protect the ceramic sleeve 12 while facilitating the removal of the protective sleeve 17 in step six.

[0066] In order to facilitate the removal of the protective sleeve 17, the two notches 18 are arranged opposite to each other, and the feed well 19 is located in the middle position of the axial dimension of the 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] In order to have sufficient thickness to protect the ceramic sleeve 12, the protective sleeve 17 can be easily removed. Figure 8-11 As shown, the thickness T2 of the left semi-annular sleeve 171 and the right semi-annular sleeve 172 is 1-3mm, and the thickness T3 of the left semi-annular block 20 and the right semi-annular block 21 is 1-3mm. In the present embodiment, the thickness T2 of the left semi-annular sleeve 171 and the right semi-annular sleeve 172 is 2mm, and the thickness T3 of the left semi-annular block 20 and the right semi-annular block 21 is 2mm.

[0069] In order to ensure that the plastic is smoothly filled into the mold cavity and at the same time reduce the shear strength as much as possible to ensure that the protective cover 17 can be peeled off smoothly, as shown in FIG. Figure 8-11 As shown, the thickness T1 of the connection between the feed well 19 and the left semi-annular block 20 and the connection between the feed well 19 and the right semi-annular block 21 is 1-2 mm. In this embodiment, the thickness T1 of the connection between the feed well 19 and the left semi-annular block 20 and the connection between the feed well 19 and the right semi-annular block 21 is 1 mm.

[0070] Furthermore, in step six, the protective sleeve 17 is removed by inserting the tapered end of the pry bar 22 into the through hole 23, forcing the left semi-annular block 20 and the right semi-annular block 21 to separate to both sides, thereby forcing the left semi-annular sleeve 171 and the right semi-annular sleeve 172 to separate to both sides, and the left semi-annular sleeve 171 and the right semi-annular sleeve 172 leave the outer circle of the ceramic sleeve 12, and the ceramic sleeve 12 is taken out, and the protective sleeve 17 is easy to remove.

[0071] In this embodiment, when the left half annular sleeve 171 and the right half annular sleeve 172 are separated to both sides, the feed well 19 will be broken.

[0072] In order to facilitate the peeling of the protective cover 17, Figure 8 , 9 As shown, the height of the protective sleeve 17 is lower than that of the ceramic sleeve 12 , and the upper and lower ends of the protective sleeve 17 are not connected to the covering member 13 .

[0073] In order to effectively protect the ceramic sleeve 12 and facilitate the removal of the protective sleeve 17, as shown in FIG. Figure 8 , 9 As shown, the distance S1 between the upper end surface of the protective sleeve 17 and the upper end surface of the ceramic sleeve 12 is 0.5-2.5 mm, and the distance S2 between the lower end surface of the protective sleeve 17 and the lower end surface of the ceramic sleeve 12 is 0.5-2.5 mm. In this embodiment, the distance S1 between the upper end surface of the protective sleeve 17 and the upper end surface of the ceramic sleeve 12 and the distance S2 between the lower end surface of the protective sleeve 17 and the lower end surface of the ceramic sleeve 12 are both 2 mm.

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

[0075] The above embodiment is only one of the preferred embodiments of the present invention, and is not intended to limit the scope of implementation of the present invention. Therefore, any equivalent changes made based on the shape, structure, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A bushing structure of a submersible pump, comprising a ceramic bushing (12) having an inner hole (11), characterized in that: A covering member (13) is provided on the ceramic sleeve (12), the covering member (13) is made of plastic and has a tensile strength greater than 100 MPa, the covering member (13) comprises an upper covering member (131) arranged above the ceramic sleeve (12), a lower covering member (132) arranged below the ceramic sleeve (12), and an inner covering member (133) arranged in the inner hole (11), the upper end of the inner covering member (133) being connected to the upper covering member (131) and the lower end being connected to the lower covering member (132), and a hexagonal hole (14) adapted to the hexagonal shaft being provided in the middle of the covering member (13).

2. A submersible pump sleeve structure according to claim 1, characterized in that: The covering piece (13) is integrally formed on the ceramic shaft sleeve (12) by injection molding.

3. A submersible pump sleeve structure according to claim 2, characterized in that: The ceramic sleeve (12) is provided with bosses (15) at the upper and lower ends respectively, and the covering member (13) forms a groove (16) at the bosses (15).

4. A submersible pump sleeve structure according to claim 1, characterized in that: The outer circles of the upper covering member (131) and the lower covering member (132) have the same diameter as the outer circle of the ceramic sleeve (12) and are coaxial, the lower end surface of the upper covering member (131) is in close contact with the upper end surface of the ceramic sleeve (12), the upper end surface of the lower covering member (132) is in close contact with the lower end surface of the ceramic sleeve (12), and the inner hole (11) is a hexagonal hole.

5. A processing technology for manufacturing a shaft sleeve structure of a submersible pump according to any one of claims 1 to 4, characterized in that: The following steps are involved: Step 1: Making a ceramic bushing (12); Step 2: placing the ceramic sleeve (12) into the injection mold; Step 3: Start the two-color injection molding machine to injection mold a protective sleeve (17) that wraps around the ceramic sleeve (12) on the outer ring of the ceramic sleeve (12); Step 4: start the two-color injection molding machine again to injection mold the coating part (13) on the ceramic sleeve (12); Step 5: Open the injection mold and take out the ceramic sleeve (12) formed with the protective sleeve (17) and the covering member (13); Step 6: Remove the protective cover (17).

6. The processing technology of the shaft sleeve structure of a submersible pump according to claim 5 is characterized in that: The protective sleeve (17) comprises a left semi-annular sleeve (171) wrapping the left half of the ceramic sleeve (12) and a right semi-annular sleeve (172) wrapping the right half of the ceramic sleeve (12), and gaps are left between the ends of the left semi-annular sleeve (171) and the ends corresponding to the right semi-annular sleeve (172) to form two notches (18), and a feed well (19) connecting the left semi-annular sleeve (171) and the right semi-annular sleeve (172) is provided at one of the notches (18). A left semi-annular block (20) is provided at the end of the left semi-annular sleeve (171) away from the feed well (19), and a right semi-annular block (21) is provided at the end of the right semi-annular sleeve (172) away from the feed well (19). A through hole (23) is formed between the left semi-annular block (20) and the right semi-annular block (21) for the tapered end of the pry bar (22) to extend therethrough, and gaps are respectively left between the two ends of the left semi-annular block (20) and the corresponding ends of the right semi-annular block (21) to form two notches (24).

7. The processing technology of the shaft sleeve structure of a submersible pump according to claim 6 is characterized in that: The thickness of the connection between the feed well (19) and the left semi-annular block (20) and the connection between the feed well (19) and the right semi-annular block (21) is 1-2 mm respectively.

8. The processing technology of the shaft sleeve structure of a submersible pump according to claim 6 is characterized in that: In step six, the protective sleeve (17) is removed by inserting the tapered end of the pry bar (22) into the through hole (23), forcing the left semi-annular block (20) and the right semi-annular block (21) to separate to both sides, thereby forcing the left semi-annular sleeve (171) and the right semi-annular sleeve (172) to separate to both sides, so that the left semi-annular sleeve (171) and the right semi-annular sleeve (172) leave the outer circle of the ceramic sleeve (12), and the ceramic sleeve (12) is removed.

9. The processing technology of the shaft sleeve structure of a submersible pump according to claim 5, characterized in that: The height of the protective sleeve (17) is lower than the height of the ceramic shaft sleeve (12), and the upper and lower ends of the protective sleeve (17) are not connected to the covering member (13).

10. The processing technology of the shaft sleeve structure of a submersible pump according to claim 9, characterized in that: The distance between the upper end surface of the protective sleeve (17) and the upper end surface of the ceramic sleeve (12) is 0.5-2.5 mm, and the distance between the lower end surface of the protective sleeve (17) and the lower end surface of the ceramic sleeve (12) is 0.5-2.5 mm.

Images