A high-pressure and high-efficiency multistage pump driven by a shielded permanent magnet high-speed motor

Abstract

The present invention discloses a high-pressure and high-efficiency multistage pump driven by a shielded permanent magnet high-speed motor, comprising a motor part and a pump part, wherein the motor part is connected to the pump part; wherein the motor part comprises a motor base, a bottom cover is provided on the lower side of the motor base, a rotor shaft is rotatably provided in the motor base, a rotor is connected to the side wall of the rotor shaft, a magnetic steel and a stainless steel sleeve are provided on the outer side of the rotor in sequence, a housing is connected to the motor base, a DC high-speed coil is connected to the inner wall of the housing, a motor end cover is provided on the upper side of the DC high-speed coil, a stainless steel thin-wall shielding sleeve is provided on the side of the DC high-speed coil close to the stainless steel sleeve, and a filling cavity is formed between the motor base, the housing, the motor end cover and the stainless steel thin-wall shielding sleeve. The present invention improves the head of the multistage pump by arranging a shielded structure outside the multistage pump motor, and at the same time makes the multistage pump not limited by the diving pressure, can be used in deep diving, can also increase the rotation speed, reduce the number of impellers, and ensure the overall stability and durability.

Description

Technical Field

[0001] The invention belongs to the technical field of drive pumps, and in particular relates to a high-pressure and high-efficiency multi-stage pump driven by a shielded permanent magnet high-speed motor. Background Art

[0002] A pump is a machine that transports fluids or pressurizes fluids. It transfers the mechanical energy of the prime mover or other external energy to the liquid to increase the energy of the liquid. It is mainly used to transport liquids such as water, oil, acid and alkali liquids, emulsions, suspensions and liquid metals. It can also transport liquid-gas mixtures and liquids containing suspended solids. Pumps can usually be divided into three types according to their working principles: positive displacement pumps, dynamic pumps and other types of pumps; according to the driving method, they can be divided into electric pumps and water turbine pumps; according to the structure, they can be divided into single-stage pumps and multi-stage pumps.

[0003] When the existing multi-stage pump is in use, there is no shielding structure inside the motor, resulting in a small head of the multi-stage pump and susceptibility to diving pressure, making the multi-stage pump unsuitable for deep diving, thereby reducing the stability and durability of the multi-stage pump in deep diving.

[0004] Therefore, in view of the above technical problems, it is necessary to provide a high-pressure and high-efficiency multi-stage pump driven by a shielded permanent magnet high-speed motor. Summary of the invention

[0005] The object of the present invention is to provide a high-pressure and high-efficiency multistage pump driven by a shielded permanent magnet high-speed motor, so as to solve the problem that the above-mentioned multistage pump cannot be applied to deep diving.

[0006] In order to achieve the above purpose, the technical solution provided by an embodiment of the present invention is as follows:

[0007] A high-pressure and high-efficiency multistage pump driven by a canned permanent magnet high-speed motor comprises a motor part and a pump part, wherein the motor part is connected to the pump part;

[0008] Wherein, the motor part comprises a motor base, a bottom cover is provided on the lower side of the motor base, a rotor shaft is rotatably provided in the motor base, a rotor is connected to the side wall of the rotor shaft, a magnetic steel and a stainless steel sleeve are provided on the outer side of the rotor in sequence, a shell is connected to the motor base, a DC high-speed coil is connected to the inner wall of the shell, a motor end cover is provided on the upper side of the DC high-speed coil, a stainless steel thin-walled shielding sleeve is provided on the side of the DC high-speed coil close to the stainless steel sleeve, a filling cavity is formed between the motor base, the shell, the motor end cover and the stainless steel thin-walled shielding sleeve, epoxy resin is provided in the filling cavity, a connecting plug is connected to the motor end cover, a cable is electrically connected to the connecting plug, one end of the cable is connected to a driver, and a power cord is connected to the driver, a first friction part and a second friction part are provided at both ends of the rotor, and a connecting part is provided at one end of the rotor shaft away from the bottom cover;

[0009] In addition, the pump part includes a spline sleeve, which is connected to the connecting part. A hexagonal shaft is provided inside the spline sleeve, and a plurality of water-dividing parts are connected to the hexagonal shaft. A volute casing is provided on the outer side of the water-dividing part. An extrusion chamber is connected to the upper part of the volute casing, and a plurality of tightening buckles are connected between the extrusion chamber and the connecting part.

[0010] Furthermore, a plurality of bottom cover fastening screws are connected between the motor base and the bottom cover, a baffle is provided on the motor base, and filter cotton is provided between the baffle and the bottom cover.

[0011] Furthermore, a fixing nut is connected to the side wall of the rotor shaft close to the baffle, and a cooling water impeller is connected to the inner wall of the rotor shaft located at the motor base, and the cooling water impeller is arranged on the upper side of the fixing nut.

[0012] Furthermore, a first alloy bearing is welded on the side wall of the rotor shaft, a first graphite sleeve is provided on the outer side of the first alloy bearing, a first spiral water groove is drilled in the first graphite sleeve, and the first graphite sleeve is in contact with the motor base.

[0013] Furthermore, the first friction part is arranged between the rotor and the motor base, and the first friction part includes a first friction plate seat, which is engaged with the motor base, and the upper side of the first friction plate seat is provided with an alloy universal fine-tuning friction plate and a first graphite friction plate in sequence, and the first graphite friction plate is welded to the rotor shaft, and stainless steel plates are welded to the upper and lower ends of the rotor.

[0014] Furthermore, the second friction part includes a ceramic anti-slip upper sleeve, which is welded to the rotor shaft, a second alloy bearing is provided on the upper side of the ceramic anti-slip upper sleeve, a second graphite sleeve is provided on the outer side of the second alloy bearing, a second spiral water groove is drilled in the second graphite sleeve, a motor cover is provided on the outer side of the second graphite sleeve, the motor cover is provided on the upper side of the motor end cover, and a plurality of connecting screws are connected between the motor cover and the motor end cover, and a cooling medium outflow hole is provided on the motor cover.

[0015] Furthermore, the connecting part includes a second friction plate seat, a plurality of friction plate seat fastening screws are connected between the second friction plate seat and the motor upper cover, a skeleton shaft seal is provided on the inner side of the second friction plate seat, and the skeleton shaft seal is arranged on the outer side of the rotor shaft, a ceramic friction plate is provided on the upper side of the second friction plate seat, a protrusion is provided on the second friction plate seat, a groove is provided on the inner side of the ceramic friction plate, the protrusion and the groove are arranged in cooperation with each other, a third graphite friction plate is provided on the upper side of the ceramic friction plate, and the third graphite friction plate is connected to the spline sleeve.

[0016] Furthermore, a connecting seat is connected to the motor upper cover, and the connecting seat is connected to the water diversion part and the volute casing. A buckle strap fastening nut is provided on the inner side of the connecting seat, and a compression buckle strap fastening screw is connected to the buckle strap fastening nut. One end of the compression buckle strap passes through the connecting seat and is connected to the compression buckle strap fastening screw.

[0017] Furthermore, a third graphite sleeve is connected to the side wall of one end of the hexagonal shaft close to the rotor shaft, a first ceramic sleeve is provided on the outer side of the third graphite sleeve, the water dividing portion includes a pressure-bearing seat, the pressure-bearing seat is arranged on the outer side of the first ceramic sleeve, a zirconia friction seat is engaged with the pressure-bearing seat, a silicon carbide friction plate is connected to the zirconia friction seat, an impeller is connected to the side wall of the hexagonal shaft, the impeller is arranged on the upper side of the silicon carbide friction plate, a graphite floating limit friction plate is provided on the upper side of the impeller, and the graphite floating limit friction plate is arranged on the outer side of the hexagonal shaft.

[0018] Furthermore, an extrusion chamber is provided at one end of the hexagonal shaft away from the rotor shaft, and a fourth graphite sleeve and a second ceramic sleeve are provided in sequence on the inner side of the extrusion chamber, the second ceramic sleeve is in contact with the hexagonal shaft, and a sleeve baffle is provided on the upper side of the fourth graphite sleeve, and a screw is connected between the sleeve baffle and the hexagonal shaft.

[0019] Compared with the prior art, the present invention has the following advantages:

[0020] The present invention increases the lift of the multi-stage pump by arranging a shielded structure outside the multi-stage pump motor, and at the same time makes the multi-stage pump not limited by the diving pressure, so that it can be used in deep diving, and can also increase the rotation speed, reduce the number of impellers, and ensure the overall stability and durability. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 A cross-sectional view of a high-pressure and high-efficiency multi-stage pump driven by a canned permanent magnet high-speed motor in one embodiment of the present invention;

[0023] Figure 2 for Figure 1 Schematic diagram of the structure at A in the middle;

[0024] Figure 3 for Figure 1 Schematic diagram of the structure at B in the middle;

[0025] Figure 4 for Figure 1 Schematic diagram of the structure at C in the middle;

[0026] Figure 5 for Figure 1 Schematic diagram of the structure at D in the middle;

[0027] Figure 6 for Figure 1 Schematic diagram of the structure at E in the middle;

[0028] Figure 7 for Figure 1 Schematic diagram of the structure at F in the middle;

[0029] Figure 8 for Figure 1 Schematic diagram of the structure at G in the middle;

[0030] Fig. 9 for Figure 1 Schematic diagram of the structure at H in the middle;

[0031] Fig.10 for Figure 1 The schematic diagram of the structure at position I in the middle;

[0032] Fig.11 for Figure 1 Schematic diagram of the structure at J in the middle.

[0033] In the figure: 1. Motor part, 101. Motor base, 102. Bottom cover, 103. Bottom cover fastening screws, 104. Baffle, 105. Filter cotton, 106. Rotor shaft, 107. Fixing nut, 108. Cooling water impeller, 109. First graphite sleeve, 110. First spiral water tank, 111. First alloy bearing, 112. First friction plate seat, 113. Alloy universal fine-tuning friction plate, 114. First graphite friction plate, 115. Magnetic steel, 116. Stainless steel sleeve, 117. DC high-speed coil, 118. Shell, 119. Epoxy resin, 120. Stainless steel sheet, 121. Motor end cover, 122. Stainless steel thin-walled shielding sleeve, 123. Ceramic anti-collision upper sleeve, 124. Second graphite sleeve, 125. Second spiral water tank, 126. Second alloy bearing, 127 .Motor cover, 128.Connecting plug, 129.Cable, 130.Second friction plate seat, 131.Skeleton shaft seal, 132.Ceramic friction plate, 133.Third graphite friction plate, 134.Connecting seat, 135.Buckle fastening nut, 136.Driver, 137.Power cord, 2.Pump unit, 201.Spline sleeve, 202.Hexagonal shaft, 203.Third graphite sleeve, 204.First ceramic sleeve, 205.Pressure seat, 206.Zirconium oxide friction seat, 207.Silicon carbide friction plate, 208.Impeller, 209.Graphite floating limit friction plate, 210.Extrusion chamber, 211.Fourth graphite sleeve, 212.Second ceramic sleeve, 213.Sleeve baffle, 214.Screw, 215.Voltage casing, 216.Compression buckle, 217.Compression buckle set screw. DETAILED DESCRIPTION

[0034] The present invention will be described in detail below in conjunction with the various embodiments shown in the accompanying drawings. However, these embodiments do not limit the present invention, and any structural, methodological or functional changes made by a person skilled in the art based on these embodiments are all within the scope of protection of the present invention.

[0035] The present invention discloses a high-pressure and high-efficiency multistage pump driven by a shielded permanent magnet high-speed motor. Figure 1-Figure 11 As shown, it includes a motor part 1 and a pump part 2.

[0036] The motor part 1 includes a motor base 101 , a bottom cover 102 is provided on the lower side of the motor base 101 , a plurality of bottom cover fastening screws 103 are connected between the motor base 101 and the bottom cover 102 , a baffle 104 is provided on the motor base 101 , and a filter cotton 105 is provided between the baffle 104 and the bottom cover 102 .

[0037] In addition, a rotor shaft 106 is rotatably provided inside the motor base 101 , a fixing nut 107 is connected to the side wall of the rotor shaft 106 close to the baffle 104 , and a cooling water impeller 108 is connected to the inner wall of the rotor shaft 106 located on the motor base 101 , and the cooling water impeller 108 is provided on the upper side of the fixing nut 107 .

[0038] Specifically, a first alloy bearing 111 is welded on the side wall of the rotor shaft 106 , a first graphite sleeve 109 is provided on the outer side of the first alloy bearing 111 , a first spiral water groove 110 is bored in the first graphite sleeve 109 , and the first graphite sleeve 109 is in contact with the motor base 101 .

[0039] refer to Figure 1-Figure 11 As shown, a rotor is connected to the side wall of the rotor shaft 106 , a magnetic steel 115 and a stainless steel sleeve 116 are arranged on the outside of the rotor in sequence, a housing 118 is connected to the motor base 101 , and a DC high-speed coil 117 is connected to the inner wall of the housing 118 .

[0040] Among them, a motor end cover 121 is provided on the upper side of the DC high-speed coil 117, and a stainless steel thin-walled shielding sleeve 122 is provided on the side of the DC high-speed coil 117 close to the stainless steel sleeve 116. A filling cavity is formed between the motor base 101, the shell 118, the motor end cover 121 and the stainless steel thin-walled shielding sleeve 122, and epoxy resin 119 is provided in the filling cavity.

[0041] In addition, the motor end cover 121 is connected to a connecting plug 128, the connecting plug 128 is electrically connected to a cable 129, one end of the cable 129 is connected to a driver 136, the driver 136 is connected to a power line 137, and the first friction part and the second friction part are respectively provided at both ends of the rotor.

[0042] Specifically, the first friction part is arranged between the rotor and the motor base 101, and the first friction part includes a first friction plate seat 112. The first friction plate seat 112 is engaged with the motor base 101, and the upper side of the first friction plate seat 112 is provided with an alloy universal fine-tuning friction plate 113 and a first graphite friction plate 114 in sequence. The first graphite friction plate 114 is welded to the rotor shaft 106, and stainless steel plates 120 are welded to the upper and lower ends of the rotor.

[0043] In addition, the second friction part includes a ceramic anti-slip upper sleeve 123, which is welded to the rotor shaft 106. A second alloy bearing 126 is provided on the upper side of the ceramic anti-slip upper sleeve 123. A second graphite sleeve 124 is provided on the outer side of the second alloy bearing 126. A second spiral water groove 125 is drilled in the second graphite sleeve 124. A motor cover 127 is provided on the outer side of the second graphite sleeve 124. The motor cover 127 is provided on the upper side of the motor end cover 121, and a plurality of connecting screws are connected between the motor cover 127 and the motor end cover 121. A cooling medium outflow hole is provided on the motor cover 127.

[0044] refer to Figure 1-Figure 11 As shown, a connecting portion is provided at one end of the rotor shaft 106 away from the bottom cover 102, and the connecting portion includes a second friction plate seat 130. A plurality of friction plate seat fastening screws are connected between the second friction plate seat 130 and the motor upper cover 127. A skeleton shaft seal 131 is provided on the inner side of the second friction plate seat 130. The skeleton shaft seal 131 is arranged on the outer side of the rotor shaft 106. A ceramic friction plate 132 is provided on the upper side of the second friction plate seat 130. A protrusion is provided on the second friction plate seat 130. A groove is provided on the inner side of the ceramic friction plate 132. The protrusion and the groove are arranged in cooperation with each other. A third graphite friction plate 133 is provided on the upper side of the ceramic friction plate 132. The third graphite friction plate 133 is connected to the spline sleeve 201.

[0045] Among them, a connecting seat 134 is connected to the motor upper cover 127, and the connecting seat 134 is connected to both the water diversion part and the volute shell 215. A buckle fastening nut 135 is provided on the inner side of the connecting seat 134, and a clamping buckle fastening screw 217 is connected to the buckle fastening nut 135. One end of the clamping buckle 216 passes through the connecting seat 134 and is connected to the clamping buckle fastening screw 217.

[0046] Preferably, a water inlet filter is connected to the connecting seat 134 .

[0047] refer to Figure 1-Figure 11 As shown, the pump part 2 includes a spline sleeve 201, which is connected to the connecting part. A hexagonal shaft 202 is provided in the spline sleeve 201. One end of the hexagonal shaft 202 located in the spline sleeve 201 is connected to an impeller shaft fixing screw. The side wall of one end of the hexagonal shaft 202 close to the rotor shaft 106 is connected to a third graphite sleeve 203. A first ceramic sleeve 204 is provided on the outer side of the third graphite sleeve 203.

[0048] Preferably, a height adjustment pad is provided on the upper side of the spline sleeve 201 , and the height adjustment pad is provided between the spline sleeve 201 and the third graphite sleeve 203 .

[0049] The spline sleeve 201 is provided with a spline groove, and the spline groove is provided with a spline.

[0050] Among them, the hexagonal shaft 202 is connected to multiple water-dividing parts, and the water-dividing parts include a pressure-bearing seat 205, which is arranged on the outer side of the first ceramic sleeve 204, and a zirconia friction seat 206 is clamped on the pressure-bearing seat 205, and a silicon carbide friction plate 207 is connected to the zirconia friction seat 206. An impeller 208 is connected to the side wall of the hexagonal shaft 202, and the impeller 208 is arranged on the upper side of the silicon carbide friction plate 207. A graphite floating limit friction plate 209 is provided on the upper side of the impeller 208, and the graphite floating limit friction plate 209 is arranged on the outer side of the hexagonal shaft 202.

[0051] In addition, an extrusion chamber 210 is provided at one end of the hexagonal shaft 202 away from the rotor shaft 106, and a fourth graphite sleeve 211 and a second ceramic sleeve 212 are provided in sequence on the inner side of the extrusion chamber 210. The second ceramic sleeve 212 is in contact with the hexagonal shaft 202. A sleeve baffle 213 is provided on the upper side of the fourth graphite sleeve 211, and a screw 214 is connected between the sleeve baffle 213 and the hexagonal shaft 202.

[0052] Specifically, a volute casing 215 is provided on the outer side of the water diversion part, an upper portion of the volute casing 215 is connected to an extrusion chamber 210 , and a plurality of clamping straps 216 are connected between the extrusion chamber 210 and the connecting portion.

[0053] When in use, the cooling water impeller 108 sucks the medium from the bottom cover 102 through the filter cotton 105, and enters the motor through the first spiral water groove 110 in the first graphite sleeve 109 to lubricate the first graphite sleeve 109, the first friction plate seat 112, the alloy universal fine-tuning friction plate 113, the first graphite friction plate 114, the ceramic anti-collision upper sleeve 123, the second graphite sleeve 124 and the second alloy bearing 126, and flows out from the cooling medium outflow hole on the motor cover 127 to take away the heat of the motor and lubricate the friction parts. The motor rotor is made of embedded magnetic steel 115, and the stator is made of DC high-speed coil 117 , stainless steel sheets 120 are welded at both ends of the rotor shaft 106, the stainless steel sleeve 116 and the stainless steel sheet 120 are welded to seal the rotor, the housing 118, the motor end cover 121, and the stainless steel thin-wall shielding sleeve 122 are welded to seal the stator, and the epoxy resin 119 is poured inside. The first alloy bearing 111 is welded on the rotor shaft 106, and the first graphite sleeve 109 between the second alloy bearing 126 and the motor base 101 and the second graphite sleeve 124 on the motor upper cover 127 rotate radially, so that the first graphite friction plate 114 assembled on the rotor end face and the alloy universal fine-tuning friction plate 113 assembled on the motor base 101 bear the axial thrust;

[0054] In addition, the upper part of the rotor shaft 106 is equipped with a ceramic anti-running upper sleeve 123 and a second graphite sleeve 124 for friction to prevent the rotor from running upward, and the outer part of the rotor shaft 106 is equipped with a skeleton shaft seal 131 to prevent mud and sand from entering;

[0055] Specifically, the bottom of the groove on the ceramic friction plate 132 is in the shape of an inner concave arc, which cooperates with the protrusion on the second friction plate seat 130, and can be universally fine-tuned for axial error. The third graphite friction plate 133 bears the weight from the spline sleeve 201 and the rotor shaft 106 itself. The inner hole of the third graphite sleeve 203 is prepared as an inner hexagonal hole, which is sleeved on the hexagonal shaft 202 and radially rotates with the third graphite sleeve 203 installed on the pressure seat 205. The zirconia friction seat 206 is tightly fitted on the pressure seat 205. The inner hole of the silicon carbide friction plate 207 is made into an inner hexagonal hole, which is sleeved on the hexagonal shaft 202 to bear the weight from the impeller 208. Axial pressure, the volute housing 215 is installed on the outer stop of the pressure seat 205, and a water separation cover is installed on the upper part of the volute housing 215. A set of pressure-bearing friction components is also assembled in the middle of the water separation cover to withstand the axial thrust generated by the second section impeller 208. The above is analogous. A stainless steel sheet is installed on the water separation cover, which is in close contact with the water inlet of the impeller 208 to reduce leakage and improve the efficiency of the impeller 208. A graphite floating limit friction plate 209 is installed on the top of the impeller 208 to rub against the lower end of the ceramic friction plate 132 installed in the middle of the water separation cover to limit the flying top damage caused by the floating of the impeller 208 during startup acceleration;

[0056] The second ceramic sleeve 212 rotates radially with the fourth graphite sleeve 211 installed in the middle of the extrusion chamber 210. The second ceramic sleeve 212 is fixed with a sleeve baffle 213 and a screw 214. The impeller cylinder is installed outside the volute casing 215. The length of the impeller cylinder should be considered when preparing it, which must not only meet the clamping force of the impeller 208, but also ensure the verticality of the entire string of impellers 208. Four evenly distributed clamping straps 216 pass through the strap holes on the connecting seat 134 and are fastened with a strap fastening nut 135 and a clamping strap fastening screw 217 welded at the end of the clamping strap 216. The cable 129 is fixed on the impeller cylinder, and the driver 136 is placed between the power cord 137 and the cable 129 to facilitate the control of the pump operation.

[0057] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0058] In addition, it should be understood that although the present specification is described according to embodiments, not every embodiment contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that those skilled in the art can understand.

Claims

1. A high-pressure and high-efficiency multistage pump driven by a canned permanent magnet high-speed motor, characterized in that: It comprises a motor part (1) and a pump part (2), wherein the motor part (1) is connected to the pump part (2); The motor part (1) comprises a motor base (101), a bottom cover (102) is provided on the lower side of the motor base (101), a rotor shaft (106) is rotatably provided inside the motor base (101), a rotor is connected to the side wall of the rotor shaft (106), a magnetic steel (115) and a stainless steel sleeve (116) are provided on the outer side of the rotor in sequence, a housing (118) is connected to the motor base (101), a DC high-speed coil (117) is connected to the inner wall of the housing (118), a motor end cover (121) is provided on the upper side of the DC high-speed coil (117), and a non-conductive material is provided on the side of the DC high-speed coil (117) close to the stainless steel sleeve (116). A stainless steel thin-wall shielding sleeve (122), a filling cavity is formed between the motor base (101), the housing (118), the motor end cover (121) and the stainless steel thin-wall shielding sleeve (122), an epoxy resin (119) is provided in the filling cavity, a connecting plug (128) is connected to the motor end cover (121), a cable (129) is electrically connected to the connecting plug (128), one end of the cable (129) is connected to a driver (136), and the driver (136) is connected to a power line (137), a first friction portion and a second friction portion are respectively provided at two ends of the rotor, and a connecting portion is provided at one end of the rotor shaft (106) away from the bottom cover (102); The pump part (2) comprises a spline sleeve (201), the spline sleeve (201) being connected to the connecting part, a hexagonal shaft (202) being arranged inside the spline sleeve (201), a plurality of water diversion parts being connected to the hexagonal shaft (202), a volute casing (215) being arranged outside the water diversion part, an extrusion chamber (210) being connected to the upper part of the volute casing (215), and a plurality of clamping buckles (216) being connected between the extrusion chamber (210) and the connecting part; The second friction part comprises a ceramic anti-slip upper sleeve (123), the ceramic anti-slip upper sleeve (123) is welded to the rotor shaft (106), a second alloy bearing (126) is provided on the upper side of the ceramic anti-slip upper sleeve (123), a second graphite sleeve (124) is provided on the outer side of the second alloy bearing (126), a second spiral water groove (125) is excavated in the second graphite sleeve (124), a motor cover (127) is provided on the outer side of the second graphite sleeve (124), the motor cover (127) is provided on the upper side of the motor end cover (121), and a plurality of connecting screws are connected between the motor cover (127) and the motor end cover (121), and a cooling medium outflow hole is provided on the motor cover (127); the connecting screws are provided on the motor cover (127) and the motor end cover (121). The connecting part includes a second friction plate seat (130), a plurality of friction plate seat fastening screws are connected between the second friction plate seat (130) and the motor upper cover (127), a skeleton shaft seal (131) is provided on the inner side of the second friction plate seat (130), and the skeleton shaft seal (131) is arranged on the outer side of the rotor shaft (106), a ceramic friction plate (132) is provided on the upper side of the second friction plate seat (130), a protrusion is provided on the second friction plate seat (130), a groove is provided on the inner side of the ceramic friction plate (132), the protrusion and the groove are arranged in cooperation with each other, a third graphite friction plate (133) is provided on the upper side of the ceramic friction plate (132), and the third graphite friction plate (133) is connected to the spline sleeve (201).

2. A high-pressure and high-efficiency multistage pump driven by a canned permanent magnet high-speed motor according to claim 1, characterized in that: A plurality of bottom cover fastening screws (103) are connected between the motor base (101) and the bottom cover (102); a baffle (104) is provided on the motor base (101); and filter cotton (105) is provided between the baffle (104) and the bottom cover (102).

3. A high-pressure and high-efficiency multistage pump driven by a canned permanent magnet high-speed motor according to claim 2, characterized in that: A fixing nut (107) is connected to the side wall of the rotor shaft (106) close to the baffle (104), and a cooling water impeller (108) is connected to the inner wall of the rotor shaft (106) located on the motor base (101), and the cooling water impeller (108) is arranged on the upper side of the fixing nut (107).

4. A high-pressure and high-efficiency multistage pump driven by a canned permanent magnet high-speed motor according to claim 3, characterized in that: A first alloy bearing (111) is welded to the side wall of the rotor shaft (106); a first graphite sleeve (109) is provided on the outer side of the first alloy bearing (111); a first spiral water groove (110) is bored in the first graphite sleeve (109); and the first graphite sleeve (109) is in contact with the motor base (101).

5. A high-pressure and high-efficiency multistage pump driven by a canned permanent magnet high-speed motor according to claim 4, characterized in that: The first friction part is arranged between the rotor and the motor base (101), and comprises a first friction plate seat (112). The first friction plate seat (112) is engaged with the motor base (101), and an alloy universal fine-tuning friction plate (113) and a first graphite friction plate (114) are arranged in sequence on the upper side of the first friction plate seat (112). The first graphite friction plate (114) is welded to the rotor shaft (106), and stainless steel plates (120) are welded to the upper and lower ends of the rotor.

6. A high-pressure and high-efficiency multi-stage pump driven by a canned permanent magnet high-speed motor according to claim 1, characterized in that: The motor upper cover (127) is connected to a connecting seat (134), the connecting seat (134) is connected to the water diversion part and the volute shell (215), a buckle belt fastening nut (135) is provided on the inner side of the connecting seat (134), a clamping buckle belt fastening screw (217) is connected to the buckle belt fastening nut (135), and one end of the clamping buckle belt (216) passes through the connecting seat (134) and is connected to the clamping buckle belt fastening screw (217).

7. A high-pressure and high-efficiency multistage pump driven by a canned permanent magnet high-speed motor according to claim 1, characterized in that: A third graphite sleeve (203) is connected to a side wall of one end of the hexagonal shaft (202) close to the rotor shaft (106); a first ceramic sleeve (204) is arranged on the outer side of the third graphite sleeve (203); the water separation portion comprises a pressure bearing seat (205); the pressure bearing seat (205) is arranged on the outer side of the first ceramic sleeve (204); a zirconium oxide friction seat (206) is engaged with the pressure bearing seat (205); a silicon carbide friction plate (207) is connected to the zirconium oxide friction seat (206); an impeller (208) is connected to the side wall of the hexagonal shaft (202); the impeller (208) is arranged on the upper side of the silicon carbide friction plate (207); a graphite floating limit friction plate (209) is arranged on the upper side of the impeller (208); the graphite floating limit friction plate (209) is arranged on the outer side of the hexagonal shaft (202).

8. A high-pressure and high-efficiency multistage pump driven by a canned permanent magnet high-speed motor according to claim 7, characterized in that: An extrusion chamber (210) is provided at one end of the hexagonal shaft (202) away from the rotor shaft (106), a fourth graphite sleeve (211) and a second ceramic sleeve (212) are provided in sequence on the inner side of the extrusion chamber (210), the second ceramic sleeve (212) is in contact with the hexagonal shaft (202), a sleeve stopper (213) is provided on the upper side of the fourth graphite sleeve (211), and a screw (214) is connected between the sleeve stopper (213) and the hexagonal shaft (202).

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