Impeller and inner magnetic rotor connecting structure of magnetic transmission centrifugal pump

Abstract

The utility model discloses an impeller and inner magnetic rotor connecting structure of a magnetic transmission centrifugal pump. The impeller and inner magnetic rotor connecting structure is provided with a shaft sleeve, an impeller and shaft assembly, an inner magnetic rotor, a retaining ring, a locking piece, a sealing nut and a sealing piece. The impeller and shaft assembly is a combination of the impeller and the shaft, when medium backflow impact occurs and the magnetic transmission centrifugal pump rotates reversely, the impeller and the shaft cannot be loosened, the locking piece cannot be impacted by medium backflow, the locking piece cannot be loosened, the structural reliability is good, the sealing nut and the sealing piece are arranged, the sealing performance is guaranteed, and the service life of the magnetic transmission centrifugal pump is prolonged. A medium does not enter among the impeller and shaft assembly, the inner magnetic rotor, the shaft sleeve, the locking piece and the sealing nut, so that corrosion or rusting is prevented, and the disassembly is relatively convenient and relatively safe; therefore, the technical problems that parts are corroded or rusted due to the fact that the impeller and the pump shaft are loosened, disassembly is inconvenient during maintenance, and potential safety hazards exist are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of centrifugal pumps, in particular to an impeller and an inner magnetic rotor connection structure of a magnetic transmission centrifugal pump. Background Art

[0002] Magnetic drive centrifugal pumps are widely used in the fields of petroleum, chemical industry, electroplating, environmental protection, water treatment, etc. to pump media.

[0003] The magnetic drive centrifugal pump generally includes: pump head part, magnetic drive part and other parts; the pump head part mainly includes: impeller, pump body, bearing, sleeve, pump cover and pump shaft and other parts; the magnetic drive part mainly includes: inner magnetic rotor, outer magnetic rotor and isolation sleeve and other parts; other parts mainly include: bracket, base, motor, intermediate bearing body and coupling and other structures;

[0004] In traditional magnetic drive centrifugal pumps, the impeller and the pump shaft are generally connected in two ways: the first is that the impeller and the pump shaft are connected by threads; the second is that the impeller and the pump shaft are plugged in, a key is set between the impeller and the pump shaft, and then the nut is connected to the pump shaft by threads to press the impeller;

[0005] It is impossible for a magnetic drive centrifugal pump to run all the time during use. There will always be a time to shut down for maintenance. During the shutdown, due to the backflow impact of the medium, the magnetic drive centrifugal pump will reverse. The above two connection methods between the impeller and the pump shaft will have the impeller loose, which will not only cause the safety hazard of the impeller falling off, but also the medium will enter through the loose gap and come into contact with the pump shaft and other parts. Since the chemical medium is corrosive, it will cause corrosion or rust between the pump shaft and the impeller, the internal magnetic rotor and other structures. It is difficult to disassemble during maintenance and repair. In serious cases, the parts will be damaged. Utility Model Content

[0006] In view of the above-mentioned deficiencies existing in the related technology, the purpose is to provide an impeller and internal magnetic rotor connection structure of a magnetic transmission centrifugal pump, so as to solve the technical problems in the related technology that the impeller and the pump shaft may become loose, which may cause corrosion or rust of parts, and it is inconvenient to disassemble during maintenance and repair, posing a safety hazard.

[0007] The technical solution to achieve the purpose is: an impeller and inner magnetic rotor connection structure of a magnetic transmission centrifugal pump, comprising:

[0008] A shaft sleeve, the shaft sleeve is connected to the middle position of the pump cover through two bearings, and the shaft sleeve passes through the pump cover, and the end of the shaft sleeve protrudes from the bearing;

[0009] An impeller and shaft assembly, wherein the middle portion of the impeller and shaft assembly is passed through the shaft sleeve and connected to the shaft sleeve, one end of the impeller and shaft assembly is arranged outside the shaft sleeve and has a first gap between the impeller and the pump cover, and the other end of the impeller and shaft assembly passes through the shaft sleeve and protrudes outside the shaft sleeve;

[0010] An inner magnetic rotor is sleeved on the other end of the impeller and shaft combination, and has a second gap between the inner magnetic rotor and the pump cover, and one end of the inner magnetic rotor is arranged between the impeller and shaft combination and the shaft sleeve;

[0011] Two stop rings are arranged at intervals and surround the shaft sleeve, one of the stop rings is arranged between the impeller and shaft assembly and one of the bearings, and the other stop ring is arranged between the inner magnetic rotor and the other of the bearings, for adjusting the first gap and the second gap;

[0012] A locking member connected to the other end of the impeller and shaft assembly to compress the inner magnetic rotor;

[0013] A sealing nut connected to the inner magnetic rotor and covering the locking member;

[0014] And a plurality of seals, one of which is arranged between the shaft sleeve and the impeller and shaft combination, one of which is arranged between the shaft sleeve and the inner magnetic rotor, and one of which is arranged between the inner magnetic rotor and the sealing nut.

[0015] Further: the material of the shaft sleeve is silicon carbide, the appearance is a cylindrical structure, a plurality of first through holes are evenly distributed, and a first stepped through hole is provided in the center;

[0016] The first through hole is not connected to the first stepped through hole.

[0017] Further: the impeller and shaft assembly includes: a first insert;

[0018] An impeller inlaid body partially wraps the first inlay, has the first gap between the impeller and the pump cover, is in contact with the stop ring, and has the seal between the impeller and the shaft sleeve;

[0019] And an extension shaft, one end of which is connected to the first insert and is spaced apart from the impeller inlay body, and the other end passes through the first stepped through hole and is plugged into the inner magnetic rotor to connect to the locking piece.

[0020] Further: the first insert has a first stepped groove, a second stepped groove and a plurality of second through holes;

[0021] The second through hole is disposed between the first stepped groove and the second stepped groove.

[0022] Further: the material of the impeller inlay body is fluoroplastic, and its structure includes: a rear cover plate, which wraps the first inlay and is inlaid in the first stepped groove, the second stepped groove and the second through hole, and the rear cover plate has a plurality of third through holes, the third through holes are aligned one by one with the second through holes, and the third through holes are connected one by one with the first through holes;

[0023] A plurality of auxiliary blades are evenly distributed on the rear cover plate and have the first gap between the auxiliary blades and the pump cover;

[0024] A front cover plate, spaced apart from the rear cover plate;

[0025] And a plurality of main blades are evenly distributed between the rear cover plate and the front cover plate.

[0026] Further: the extension shaft includes: a first straight shaft section, connected to the first insert and matched with the first stepped through hole; a tapered shaft section, connected to the first straight shaft section and plugged into the inner magnetic rotor; a second straight shaft section, connected to the tapered shaft section; and a threaded shaft section, connected to the second straight shaft section and connected to the locking piece.

[0027] Further: the inner magnetic rotor comprises: a second insert, the second insert having a second stepped through hole, a plurality of fourth through holes, a third stepped groove and a fourth stepped groove, the second stepped through hole being plugged with the tapered shaft section, the second stepped through hole accommodating the second straight shaft section, the threaded shaft section, the locking member and the sealing nut;

[0028] And a first embedded outer layer, made of fluoroplastic, wrapped on the second insert, embedded in a part of the second stepped through hole, and embedded in the fourth through hole, the third stepped groove and the fourth stepped groove, with the second gap between the pump cover, in contact with the stop ring, with the seal between the sleeve and the sealing nut, and a plurality of fifth through holes on the first embedded outer layer, the fifth through holes are aligned one-to-one with the fourth through holes, and connected one-to-one with the first through holes.

[0029] Further: the locking member includes: a flat washer, which is sleeved on the threaded shaft section and contacts the second insert; a spring washer, which is sleeved on the threaded shaft section and contacts the flat washer; and a nut, which is threadedly connected to the threaded shaft section to compress the spring washer and the flat washer.

[0030] Further: the sealing nut includes: a third insert, one end of which is threadedly connected to the second insert and covers the locking piece; and a second embedded outer layer, made of fluoroplastic, wrapped on the third insert, in contact with the first embedded outer layer, and with the sealing piece between the third insert and the first embedded outer layer.

[0031] Further: the sealing element is an O-ring.

[0032] The above technical solution has the following beneficial effects: an impeller and inner magnetic rotor connection structure of a magnetic transmission centrifugal pump, compared with the related art, is provided with a shaft sleeve, an impeller and shaft assembly, an inner magnetic rotor, a stop ring, a locking member, a sealing nut and a sealing member;

[0033] The impeller and shaft combination is a combination of an impeller and a shaft. When the medium backflows and impacts the impeller and shaft combination, and the magnetic transmission centrifugal pump reverses, the impeller and the shaft will not be loose, the locking piece will not be impacted by the medium backflow, and the locking piece will not be loose. The structural reliability is good, and a sealing nut and a sealing piece are provided to ensure the sealing performance. The medium will not enter between the impeller and shaft combination, the inner magnetic rotor, the shaft sleeve, the locking piece and the sealing nut, thereby preventing corrosion or rust, and the disassembly is relatively convenient and relatively safe.

[0034] A stop ring is provided, which can not only be used to limit the sleeve, the impeller and shaft assembly, the internal magnetic rotor and the bearing, but also can be used to adjust the first gap between the impeller and shaft assembly and the pump cover, and the second gap between the internal magnetic rotor and the pump cover, so that each component can be reliably positioned without collision or scratching, and the amount of medium flowing into the gap is reduced, and the probability of the medium entering between the impeller and shaft assembly, the internal magnetic rotor, the sleeve, the locking piece and the sealing nut is reduced, which indirectly plays a role in preventing corrosion or rust;

[0035] Thereby overcoming the technical problem that looseness may occur between the impeller and the pump shaft, which may cause corrosion or rust of parts, inconvenient disassembly during maintenance and repair, and potential safety hazards, and achieving the technical effect of preventing looseness between the impeller and the pump shaft, preventing corrosion or rust, and relatively convenient and safe disassembly, which is practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is the assembly section view;

[0037] Figure 2 It is a schematic diagram of the structure of the shaft sleeve;

[0038] Figure 3 It is a schematic diagram of the structure of the impeller and shaft assembly and the seal;

[0039] Figure 4 is a schematic structural diagram of a first insert;

[0040] Figure 5 is a schematic diagram of the structure of the inner magnetic rotor;

[0041] Figure 6 is a schematic structural diagram of a second insert;

[0042] Figure 7 It is a schematic diagram of the structure of the shaft sleeve, the extension shaft, the inner magnetic rotor, the stop ring, the locking piece, the sealing nut and the sealing piece;

[0043] Figure 8 It is a schematic diagram of the structure of the sealing nut;

[0044] In the figure: 10. sleeve, 11. first through hole, 12. first stepped through hole, 20. impeller and shaft assembly, 21. first insert, 21-1. first stepped groove, 21-2. second stepped groove, 21-3. second through hole, 22. impeller inlaid body, 22-1. rear cover, 22-11. third through hole, 22-2. auxiliary blade, 22-3. front cover, 22-4. main blade, 23. extension shaft, 23-1. first straight shaft section, 23-2. tapered shaft section, 23-3. second straight shaft section, 23-4. threaded shaft Segment, 30. Inner magnetic rotor, 31. Second insert, 31-1. Second stepped through hole, 31-2. Fourth through hole, 31-3. Third stepped groove, 31-4. Fourth stepped groove, 32. First inlaid outer layer, 32-1. Fifth through hole, 40. Stop ring, 50. Locking piece, 51. Flat washer, 52. Spring washer, 53. Nut, 60. Sealing nut, 61. Third insert, 62. Second inlaid outer layer, 70. Seal, 100. Bearing, 200. Pump cover, 300. First gap, 400. Second gap. DETAILED DESCRIPTION

[0045] In order to make the content easier to understand, the following is a further detailed description based on specific embodiments and in conjunction with the accompanying drawings;

[0046] A magnetic drive centrifugal pump impeller and inner magnetic rotor connection structure solves the technical problems in the related art that the impeller and the pump shaft may become loose, which may lead to corrosion or rust of parts, inconvenient disassembly during maintenance and repair, and potential safety hazards. The structure can be manufactured and used, and achieves the positive effects of preventing the impeller and the pump shaft from becoming loose, preventing corrosion or rust, and being relatively convenient and safe to disassemble. The overall idea is as follows:

[0047] Implementation

[0048] like Figure 1 As shown; A connection structure of an impeller and an inner magnetic rotor of a magnetic transmission centrifugal pump, comprising:

[0049] A shaft sleeve 10, wherein the shaft sleeve 10 is connected to the middle position of the pump cover 200 through two bearings 100, and the shaft sleeve 10 passes through the pump cover 200, and the end of the shaft sleeve 10 protrudes from the bearing 100;

[0050] An impeller and shaft assembly 20, wherein the middle portion of the impeller and shaft assembly 20 is passed through the shaft sleeve 10 and connected to the shaft sleeve 10, one end of the impeller and shaft assembly 20 is arranged outside the shaft sleeve 10 and has a first gap 300 between the impeller and the pump cover 200, and the other end of the impeller and shaft assembly 20 passes through the shaft sleeve 10 and protrudes outside the shaft sleeve 10;

[0051] The inner magnetic rotor 30 is sleeved on the other end of the impeller and shaft assembly 20, and has a second gap 400 between the inner magnetic rotor 30 and the pump cover 200, and one end of the inner magnetic rotor 30 is arranged between the impeller and shaft assembly 20 and the shaft sleeve 10;

[0052] Two stop rings 40 are arranged at intervals and surround the shaft sleeve 10, one of the stop rings 40 is arranged between the impeller and shaft assembly 20 and one of the bearings 100, and the other of the stop rings 40 is arranged between the inner magnetic rotor 30 and another of the bearings 100, for adjusting the first gap 300 and the second gap 400;

[0053] A locking member 50 is connected to the other end of the impeller and shaft assembly 20 to press the inner magnetic rotor 30;

[0054] A sealing nut 60 is connected to the inner magnetic rotor 30 and covers the locking member 50;

[0055] and a plurality of seals 70, one of which is disposed between the sleeve 10 and the impeller and shaft assembly 20, one of which is disposed between the sleeve 10 and the inner magnetic rotor 30, and one of which is disposed between the inner magnetic rotor 30 and the sealing nut 60;

[0056] Specifically, during implementation, a sleeve 10, an impeller and shaft assembly 20, an inner magnetic rotor 30, a stop ring 40, a locking member 50, a sealing nut 60 and a sealing member 70 are provided;

[0057] The impeller and shaft assembly 20 is a combination of an impeller and a shaft. When the medium backflows and impacts the impeller and shaft assembly 20, and the magnetic transmission centrifugal pump reverses, the impeller and the shaft will not be loosened, the locking piece 50 will not be impacted by the medium backflow, and the locking piece 50 will not be loosened. The structural reliability is good, and a sealing nut 60 and a sealing piece 70 are provided to ensure the sealing performance. The medium will not enter between the impeller and shaft assembly 20, the inner magnetic rotor 30, the shaft sleeve 10, the locking piece 50 and the sealing nut 60, so as to prevent the impeller and shaft assembly 20, the inner magnetic rotor 30, the locking piece 50 and the sealing nut 60 from being corroded or rusted. The disassembly is relatively convenient and relatively safe.

[0058] A stop ring 40 is provided, which can not only be used to limit the sleeve 10, the impeller and shaft assembly 20, the inner magnetic rotor 30 and the bearing 100, but also can be used to adjust the first gap 300 between the impeller and shaft assembly 20 and the pump cover 200, and adjust the second gap 400 between the inner magnetic rotor 30 and the pump cover 200, so that each component can be reliably positioned without collision or scratching, and the amount of medium flowing into the gap is reduced, and the probability of the medium entering between the impeller and shaft assembly 20, the inner magnetic rotor 30, the sleeve 10, the locking piece 50 and the sealing nut 60 is reduced, which indirectly plays a role in preventing corrosion or rust;

[0059] Another embodiment:

[0060] like Figure 1 , Figure 2 , Figure 7 As shown; during implementation, the sleeve 10 is made of silicon carbide, has a cylindrical shape, has a plurality of first through holes 11 evenly distributed, and has a first stepped through hole 12 at the center;

[0061] The number of the first through holes 11 may be three, and they are not connected to the first stepped through holes 12;

[0062] The material of the shaft sleeve 10 is silicon carbide and is formed by a pressureless sintering method (pressureless sintering is common knowledge);

[0063] The shaft sleeve 10 is provided, which is conducive to connecting the impeller and shaft assembly 20 and the inner magnetic rotor 30, ensuring the coaxiality of the assembly, and is also conducive to setting the seal 70, improving the sealing performance. After the shaft sleeve 10 is combined with the impeller and shaft assembly 20 and the inner magnetic rotor 30, as the inner magnetic rotor 30 rotates, the shaft sleeve 10 and the impeller and shaft assembly 20 rotate together, and the shaft sleeve 10 contacts the bearing 100, thereby protecting the impeller and shaft assembly 20 and extending the service life of the impeller and shaft assembly 20;

[0064] Another embodiment:

[0065] like Figure 1 , Figure 3, Figure 4 , Figure 7 As shown; during implementation, the impeller and shaft assembly 20 includes: a first insert 21; an impeller embedded body 22, which partially wraps the first insert 21, has the first gap 300 between the impeller and the pump cover 200, contacts the stop ring 40, and has the seal 70 between the impeller and the shaft sleeve 10; and an extension shaft 23, one end of the extension shaft 23 is connected to the first insert 21, is spaced apart from the impeller embedded body 22, and the other end passes through the first stepped through hole 12, is plugged with the inner magnetic rotor 30, and is connected to the locking member 50;

[0066] The first insert 21 and the extension shaft 23 are made of alloy steel and are integrally formed, so the structural strength is relatively high;

[0067] The first insert 21 has a first stepped groove 21-1, a second stepped groove 21-2 and a plurality of second through holes 21-3; the second through hole 21-3 is arranged between the first stepped groove 21-1 and the second stepped groove 21-2; the first stepped groove 21-1 and the second stepped groove 21 are arranged, the contact area between the impeller inlay body 22 and the first insert 21 is increased, the two will not fall off after being inlaid, and the structural reliability is relatively good; the second through hole 21-3 is arranged, the contact area between the first insert 21 and the impeller inlay body 22 is increased, the two will not fall off after being inlaid, the structural reliability is relatively good, and it is conducive to the arrangement of the third through hole 22-11;

[0068] The material of the impeller inlay body 22 is fluoroplastic, and its structure includes: a rear cover plate 22-1, which wraps the first inlay 21 and is inlaid in the first stepped groove 21-1, the second stepped groove 21-2 and the second through hole 21-3, and the rear cover plate 22-1 has a plurality of third through holes 22-11, the third through holes 22-11 are aligned one by one with the second through holes 21-3, and the third through holes 22-11 are connected one by one with the first through holes 11; a plurality of auxiliary blades 22-2 are evenly distributed on the rear cover plate The plate 22-1 has the first gap 300 between it and the pump cover 200; the front cover plate 22-3 is spaced apart from the rear cover plate 22-1; and a plurality of main blades 22-4 are evenly distributed between the rear cover plate 22-1 and the front cover plate 22-3; the auxiliary blades 22-2 are straight strip structures, and the number can be six; the main blades 22-4 are arc-shaped structures, and the number can be four; the impeller inlay body 22 is fluoroplastic, which has relatively good corrosion resistance when in contact with the medium, and is wrapped outside the first insert 21 to protect the first insert 21;

[0069] The extension shaft 23 includes: a first straight shaft section 23-1, connected to the first insert 21, and matched with the first stepped through hole 12; a tapered shaft section 23-2, connected to the first straight shaft section 23-1, and plugged with the inner magnetic rotor 30; a second straight shaft section 23-3, connected to the tapered shaft section 23-2; and a threaded shaft section 23-4, connected to the second straight shaft section 23-3, and connected to the locking member 50; the provision of the extension shaft 23 is conducive to connecting the sleeve 10, the inner magnetic rotor 30 and the locking member 50;

[0070] An impeller and shaft assembly 20 is provided, and the impeller and shaft assembly 20 is a combination of an impeller and a shaft. When the medium refluxes and impacts the impeller and shaft assembly 20, and the magnetic transmission centrifugal pump reverses, the impeller and the shaft will not be loosened, and the locking piece 50 will not be impacted by the medium reflux, and the locking piece 50 will not be loosened. The structural reliability is good, and a sealing nut 60 and a sealing piece 70 are provided to ensure the sealing performance. The medium will not enter between the impeller and shaft assembly 20, the inner magnetic rotor 30, the shaft sleeve 10, the locking piece 50 and the sealing nut 60, thereby preventing corrosion or rust, and the disassembly is relatively convenient and relatively safe.

[0071] Another embodiment:

[0072] like Figure 1 , Figure 5 , Figure 6 , Figure 7 As shown; in implementation, the inner magnetic rotor 30 includes: a second insert 31, the second insert 31 has a second stepped through hole 31-1, a plurality of fourth through holes 31-2, a third stepped groove 31-3 and a fourth stepped groove 31-4, the second stepped through hole 31-1 is plugged with the tapered shaft section 23-2, and the second stepped through hole 31-1 accommodates the second straight shaft section 23-3, the threaded shaft section 23-4, the locking member 50 and the sealing nut 60;

[0073] and a first embedded outer layer 32, made of fluoroplastic, wrapped on the second embedded part 31, embedded in a part of the second stepped through hole 31-1, and embedded in the fourth through hole 31-2, the third stepped groove 31-3 and the fourth stepped groove 31-4, with the second gap 400 between the first embedded outer layer 32 and the pump cover 200, in contact with the stop ring 40, with the sealing member 70 between the first embedded outer layer 32 and the shaft sleeve 10 and the sealing nut 60, and with a plurality of fifth through holes 32-1 on the first embedded outer layer 32, the fifth through holes 32-1 are aligned one-to-one with the fourth through holes 31-2, and are in one-to-one communication with the first through hole 11;

[0074] The second insert 31 is made of alloy steel, and a permanent magnet is arranged on the outer circle, for example, a magnetic steel with N and S poles arranged alternately, which is common knowledge and is conducive to the linkage rotation of the external magnetic rotor;

[0075] The second insert 31 has a second stepped through hole 31-1, a fourth through hole 31-2, a third stepped groove 31-3 and a fourth stepped groove 31-4, which increases the contact area between the first embedded outer layer 32 and the second insert 31. After the two are embedded, they will not fall off, and the structural reliability is relatively good;

[0076] A second stepped through hole 31-1 is provided, which is convenient for plugging with the extension shaft 23 and accommodating the locking member 50 and the sealing nut 60, so that the assembly is relatively convenient and the structure is relatively compact;

[0077] The fourth through hole 31-2 is provided, which is conducive to the provision of the fifth through hole 32-1;

[0078] The first embedded outer layer 32 is made of fluoroplastics, which has relatively good corrosion resistance when in contact with the medium, protects the second embedded part 31, and does not affect the magnetic field. The outer magnetic rotor can rotate in conjunction with the inner magnetic rotor 30 (this is common knowledge);

[0079] An inner magnetic rotor 30 is provided, which is rotated in conjunction with the outer magnetic rotor, thereby rotating the sleeve 10, the impeller and shaft assembly 20, the stop ring 40, the locking member 50, the sealing nut 60 and the sealing member 70 together;

[0080] A fifth through hole 32-1 is provided, which is connected with the first through hole 11 and the third through hole 22-11, so as to facilitate the medium to flow back from the inner magnetic rotor 30 to the impeller and shaft assembly 20, and prevent the medium from entering the impeller and shaft assembly 20, the inner magnetic rotor 30, the sleeve 10, the locking member 50 and the sealing nut 60, thereby reducing the probability of the first insert 21, the extension shaft 23, the second insert 31, the locking member 50 and the third insert 61 contacting the medium, preventing corrosion or rust, and making disassembly relatively convenient and relatively safe;

[0081] Another embodiment:

[0082] like Figure 1 , Figure 7As shown; during implementation, a stop ring 40 is provided, which can not only be used to limit the sleeve 10, the impeller and shaft assembly 20, the inner magnetic rotor 30 and the bearing 100, but also can be used to adjust the first gap 300 between the impeller and shaft assembly 20 and the pump cover 200, and adjust the second gap 400 between the inner magnetic rotor 30 and the pump cover 200, so that each component can be reliably positioned without collision and scratching, and the amount of medium flowing into the gap is reduced, and the probability of the medium entering between the impeller and shaft assembly 20, the inner magnetic rotor 30, the sleeve 10, the locking piece 50 and the sealing nut 60 is reduced, which indirectly plays a role in preventing corrosion or rust, and the structural reliability is relatively good;

[0083] Another embodiment:

[0084] like Figure 1 , Figure 7 As shown; when implemented, the locking member 50 includes: a flat washer 51, which is sleeved at the threaded shaft section 23-4 and contacts the second insert 31; a spring washer 52, which is sleeved at the threaded shaft section 23-4 and contacts the flat washer 51; and a nut 53, which is threadedly connected to the threaded shaft section 23-4 and presses the spring washer 52 and the flat washer 51; the flat washer 51, the spring washer 52 and the nut 53 are common structures in the prior art, which are used for locking and are relatively easy to disassemble;

[0085] Another embodiment:

[0086] like Figure 1 , Figure 7 , Figure 8 As shown; when implemented, the sealing nut 60 includes: a third insert 61, one end of which is threadedly connected to the second insert 31 and covers the locking member 50; and a second embedded outer layer 62, which is made of fluoroplastic and wrapped on the third insert 61, in contact with the first embedded outer layer 32, and has the sealing member 70 between the third insert 61 and the first embedded outer layer 32;

[0087] The third insert 61 is made of alloy steel, has relatively high structural strength, and is threadedly connected to the second insert 31, making assembly and disassembly relatively convenient;

[0088] The second inlay outer layer 62 is made of fluoroplastics, which is relatively corrosion-resistant when in contact with the medium. It is wrapped around the outside of the third inlay 61 to protect the third inlay 61, and works together with the seal 70 to form a barrier to prevent the medium from entering the contact extension shaft 23, the second inlay 31, the locking member 50 and the third inlay 61, thereby reducing the probability of corrosion or rust, and is relatively convenient and safe to disassemble.

[0089] Another embodiment:

[0090] like Figure 1 , Figure 7 As shown; during implementation, the sealing member 70 is an O-ring made of fluororubber, which ensures sealing performance, prevents the medium from entering and contacting the first insert 21, the extension shaft 23, the second insert 31, the locking member 50 and the third insert 61, reduces the probability of corrosion or rust, and is relatively convenient and safe to disassemble;

[0091] Regarding the structure of the bearing 100 and the pump cover 200:

[0092] See Figure 1 The bearing 100 and the pump cover 200 are common structures in the prior art, and are not the inventive point of the present invention. They are only for better describing the present invention and facilitating understanding of the technical solution of the present invention. After reading the disclosed content, ordinary technicians in this field can directly and unambiguously know how to set them without creative labor or excessive experiments.

[0093] About the molding method between the insert and the inlaid outer layer:

[0094] The molding method between the insert and the inlaid outer layer, for example: the fluoroplastic melted by heat is injected into the mold cavity by high pressure, and the molded product is obtained after cooling and solidification. The molding process can be roughly divided into six stages, mold closing (with the insert in the mold cavity), injection, pressure holding, cooling, mold opening, and product removal. The above process is repeated to continuously produce the assembly of the insert and the inlaid layer. It is common knowledge and is not the invention point of the utility model. It is only for better description of the utility model and to facilitate understanding of the technical solution of the utility model. After seeing the disclosed content, ordinary technicians in this field can directly and unambiguously know how to set it without creative labor or excessive experiments.

[0095] The working principle is as follows: the impeller and shaft assembly 20 is a combination of an impeller and a shaft. When the medium backflows and impacts the impeller and shaft assembly 20, and the magnetic transmission centrifugal pump reverses, the impeller and the shaft will not be loosened, the locking piece 50 will not be impacted by the medium backflow, and the locking piece 50 will not be loosened. The structural reliability is good, and a sealing nut 60 and a sealing piece 70 are provided to ensure the sealing performance. The medium will not enter between the impeller and shaft assembly 20, the inner magnetic rotor 30, the shaft sleeve 10, the locking piece 50 and the sealing nut 60, so as to prevent the impeller and shaft assembly 20, the inner magnetic rotor 30, the locking piece 50 and the sealing nut 60 from corrosion or rust. The disassembly is relatively convenient and relatively safe.

[0096] In the description, it should be understood that the terms "upper", "lower", "left", "right", "front", "back" and the like indicating directions or positional relationships are based on the positional relationships described in the drawings and are only for the convenience of description or simplified description, rather than indicating specific directions that must be possessed; the operation process described in the embodiments is not an absolute usage procedure and corresponding adjustments may be made in actual use;

[0097] Unless otherwise defined, the technical or scientific terms used herein shall have the usual meanings understood by persons with ordinary skills in the relevant field; the words "first", "second" and similar words used in the specification and claims do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "a" do not necessarily indicate a quantity limitation, but indicate the existence of at least one, which needs to be determined according to the content of the embodiment;

[0098] The above is only a preferred specific implementation method, but the protection scope is not limited to it. Any technician familiar with this technical field can make equivalent substitutions or changes based on the technical solutions and inventive concepts within the disclosed technical scope, which should be covered by the protection scope.

Claims

1. A connection structure between an impeller and an inner magnetic rotor of a magnetic transmission centrifugal pump, characterized in that: include: A shaft sleeve, the shaft sleeve is connected to the middle position of the pump cover through two bearings, and the shaft sleeve passes through the pump cover, and the end of the shaft sleeve protrudes from the bearing; An impeller and shaft assembly, wherein the middle portion of the impeller and shaft assembly is passed through the shaft sleeve and connected to the shaft sleeve, one end of the impeller and shaft assembly is arranged outside the shaft sleeve and has a first gap between the impeller and the pump cover, and the other end of the impeller and shaft assembly passes through the shaft sleeve and protrudes outside the shaft sleeve; An inner magnetic rotor is sleeved on the other end of the impeller and shaft combination, and has a second gap between the inner magnetic rotor and the pump cover, and one end of the inner magnetic rotor is arranged between the impeller and shaft combination and the shaft sleeve; Two stop rings are arranged at intervals and surround the shaft sleeve, one of the stop rings is arranged between the impeller and shaft assembly and one of the bearings, and the other stop ring is arranged between the inner magnetic rotor and the other of the bearings, for adjusting the first gap and the second gap; A locking member connected to the other end of the impeller and shaft assembly to compress the inner magnetic rotor; A sealing nut connected to the inner magnetic rotor and covering the locking member; And a plurality of seals, one of which is arranged between the shaft sleeve and the impeller and shaft combination, one of which is arranged between the shaft sleeve and the inner magnetic rotor, and one of which is arranged between the inner magnetic rotor and the sealing nut.

2. The impeller and inner magnetic rotor connection structure of a magnetic transmission centrifugal pump according to claim 1, characterized in that: The sleeve is made of silicon carbide and has a cylindrical shape. It is evenly distributed with a number of first through holes, and has a first stepped through hole in the center. The first through hole is not connected to the first stepped through hole.

3. The impeller and inner magnetic rotor connection structure of a magnetic transmission centrifugal pump according to claim 2, characterized in that: The impeller and shaft assembly comprises: a first insert; An impeller inlaid body partially wraps the first inlay, has the first gap between the impeller and the pump cover, is in contact with the stop ring, and has the seal between the impeller and the shaft sleeve; And an extension shaft, one end of which is connected to the first insert and is spaced apart from the impeller inlay body, and the other end passes through the first stepped through hole and is plugged into the inner magnetic rotor to connect to the locking piece.

4. The impeller and inner magnetic rotor connection structure of a magnetic transmission centrifugal pump according to claim 3, characterized in that: The first insert has a first stepped groove, a second stepped groove and a plurality of second through holes; The second through hole is disposed between the first stepped groove and the second stepped groove.

5. The impeller and inner magnetic rotor connection structure of a magnetic transmission centrifugal pump according to claim 4, characterized in that: The impeller inlay body is made of fluoroplastics, and its structure includes: a rear cover plate, which wraps the first inlay and is inlaid in the first stepped groove, the second stepped groove and the second through hole, and the rear cover plate has a plurality of third through holes, the third through holes are aligned one by one with the second through holes, and the third through holes are connected one by one with the first through holes; A plurality of auxiliary blades are evenly distributed on the rear cover plate and have the first gap between the auxiliary blades and the pump cover; A front cover plate, spaced apart from the rear cover plate; And a plurality of main blades are evenly distributed between the rear cover plate and the front cover plate.

6. The impeller and inner magnetic rotor connection structure of a magnetic transmission centrifugal pump according to claim 5, characterized in that: The extension shaft includes: a first straight shaft section, connected to the first insert and matched with the first stepped through hole; a tapered shaft section, connected to the first straight shaft section and plugged into the inner magnetic rotor; a second straight shaft section, connected to the tapered shaft section; and a threaded shaft section, connected to the second straight shaft section and connected to the locking piece.

7. The impeller and inner magnetic rotor connection structure of a magnetic transmission centrifugal pump according to claim 6, characterized in that: The inner magnetic rotor comprises: a second insert, the second insert having a second stepped through hole, a plurality of fourth through holes, a third stepped groove and a fourth stepped groove, the second stepped through hole being plugged with the tapered shaft section, the second stepped through hole accommodating the second straight shaft section, the threaded shaft section, the locking member and the sealing nut; And a first embedded outer layer, made of fluoroplastic, wrapped on the second insert, embedded in a part of the second stepped through hole, and embedded in the fourth through hole, the third stepped groove and the fourth stepped groove, with the second gap between the pump cover, in contact with the stop ring, with the seal between the sleeve and the sealing nut, and a plurality of fifth through holes on the first embedded outer layer, the fifth through holes are aligned one-to-one with the fourth through holes, and connected one-to-one with the first through holes.

8. The impeller and inner magnetic rotor connection structure of a magnetic transmission centrifugal pump according to claim 7, characterized in that: The locking member includes: a flat washer, which is sleeved on the threaded shaft section and contacts the second insert; a spring washer, which is sleeved on the threaded shaft section and contacts the flat washer; and a nut, which is threadedly connected to the threaded shaft section and presses the spring washer and the flat washer.

9. The impeller and inner magnetic rotor connection structure of a magnetic transmission centrifugal pump according to claim 8, characterized in that: The sealing nut includes: a third insert, one end of which is threadedly connected to the second insert and covers the locking member; and a second embedded outer layer, which is made of fluoroplastic, wrapped on the third insert, in contact with the first embedded outer layer, and has the sealing member between the third insert and the first embedded outer layer.

10. The impeller and inner magnetic rotor connection structure of a magnetic transmission centrifugal pump according to claim 9, characterized in that: The sealing element is an O-ring.

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