CN114928196A - High-pressure high-efficiency multistage pump driven by shielded permanent magnet high-speed motor - Google Patents

Abstract

The invention discloses a high-voltage and high-efficiency multistage pump driven by a shielded permanent magnet high-speed motor, comprising a motor part and a pump part, the motor part is connected with the pump part; wherein, the motor part comprises a motor base, and the lower side of the motor base is provided with The bottom cover, the rotor shaft is rotated in the motor base, the side wall of the rotor shaft is connected with the rotor, the outer side of the rotor is sequentially provided with a magnetic steel and a stainless steel sleeve, the motor base is connected with a casing, and the inner wall of the casing is connected with a DC High-speed coil, the upper side of the DC high-speed coil is provided with a motor end cover, and the side of the DC high-speed coil close to the stainless steel sleeve is provided with a stainless steel thin-walled shielding sleeve. There is a filling cavity. By arranging a shielding structure outside the motor of the multi-stage pump, the present invention increases the lift of the multi-stage pump, at the same time, the multi-stage pump is not restricted by the submersible pressure and can be used in deep diving, and can also increase the rotational speed, reduce the number of impellers, and ensure the overall stability and durability.

Description

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

technical field

The invention belongs to the technical field of driving pumps, in particular to a high-voltage and high-efficiency multi-stage pump driven by a shielded permanent magnet high-speed motor.

Background technique

Pump is a machine that conveys fluid or pressurizes fluid. 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 convey water, oil, acid and alkali, emulsion, suspension emulsion and liquid. Metals and other liquids can also transport liquids, gas mixtures and liquids containing suspended solids. Pumps can usually be divided into three categories: positive displacement pumps, dynamic pumps and other types of pumps according to their working principles; electric pumps and turbine pumps according to their driving methods; single-stage pumps and multi-stage pumps according to their structure.

When the existing multi-stage pump is in use, there is no shielding structure inside the motor, which leads to the phenomenon that the multi-stage pump has a small head and is easily subjected to submersible pressure, which makes the multi-stage pump unsuitable for deep diving, thereby reducing the multi-stage pump in deep diving. Diving stability and durability.

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

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a high-pressure high-efficiency multi-stage pump driven by a shielded permanent magnet high-speed motor, so as to solve the problem that the above-mentioned multi-stage pump is not suitable for deep diving.

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

A high-voltage and high-efficiency multi-stage pump driven by a shielded permanent magnet high-speed motor, comprising a motor part and a pump part, wherein the motor part is connected with the pump part;

The motor part includes a motor base, a bottom cover is provided on the lower side of the motor base, a rotor shaft is rotated in the motor base, a rotor is connected to the side wall of the rotor shaft, and the outer side of the rotor is A magnetic steel and a stainless steel sleeve are arranged in sequence, a casing is connected to the motor base, a DC high-speed coil is connected to the inner wall of the casing, and a motor end cover is arranged on the upper side of the DC high-speed coil. The side of the coil close to the stainless steel sleeve is provided with a stainless steel thin-walled shielding sleeve, a filling cavity is formed between the motor base, the casing, the motor end cover and the stainless steel thin-walled shielding sleeve, and an epoxy resin is arranged in the filling cavity, A connecting plug is connected to the motor end cover, and 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, and two ends of the rotor are respectively provided. There are a first friction part and a second friction part, and the end of the rotor shaft away from the bottom cover is provided with a connecting part;

In addition, the pump part includes a spline sleeve, the spline sleeve is connected with the connecting part, the spline sleeve is provided with a hexagonal shaft, and the hexagonal shaft is connected with a plurality of water dividing parts, the A volute casing is arranged on the outer side of the water dividing part, the upper part of the volute casing is connected with a pressing-out chamber, and a plurality of pressing buckles are connected between the pressing-out chamber and the connecting part.

Further, a plurality of bottom cover fastening screws are connected between the motor base and the bottom cover, a baffle is arranged on the motor base, and a filter cotton is arranged between the baffle and the bottom cover.

Further, a fixing nut is connected to the side wall of the rotor shaft close to the baffle plate, and a cooling water impeller is connected to the inner wall of the rotor shaft on the motor base, and the cooling water impeller is arranged on the fixing nut. the upper side.

Further, a first alloy bearing is welded on the side wall of the rotor shaft, the outer side of the first alloy bearing is provided with a first graphite bushing, and a first spiral water groove is drilled in the first graphite bushing, so the The first graphite bushing is in contact with the motor base.

Further, the first friction part is arranged between the rotor and the motor base, the first friction part includes a first friction plate seat, and the first friction plate seat is engaged with the motor base, so The upper side of the first friction plate seat is sequentially provided with an alloy universal fine-tuning friction plate and a first graphite friction plate, the first graphite friction plate is welded with the rotor shaft, and the upper and lower ends of the rotor are welded with stainless steel. piece.

Further, the second friction part includes a ceramic anti-slip upper sleeve, which is welded to the rotor shaft, and a second alloy bearing is provided on the upper side of the ceramic anti-slip upper sleeve, The outer side of the second alloy bearing is provided with a second graphite bushing, a second spiral water groove is excavated in the second graphite bushing, and a motor upper cover is provided on the outer side of the second graphite bushing, and the motor The cover is arranged on the upper side of the motor end cover, a plurality of connecting screws are connected between the motor upper cover and the motor end cover, and the motor upper cover is provided with cooling medium outflow holes.

Further, 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 upper cover of the motor, and the inner side of the second friction plate seat is provided with a plurality of friction plate seat fastening screws. There is a skeleton shaft seal, the skeleton shaft seal is arranged on the outer side of the rotor shaft, the upper side of the second friction plate seat is provided with a ceramic friction plate, the second friction plate seat is provided with a protrusion, the The inner side of the ceramic friction plate is provided with grooves, the protrusions and the grooves are arranged in cooperation with each other, the upper side of the ceramic friction plate is provided with a third graphite friction plate, and the third graphite friction plate and the spline sleeve are arranged connected.

Further, a connecting seat is connected to the upper cover of the motor, the connecting seat is connected with the water dividing part and the volute shell, and the inner side of the connecting seat is provided with a buckle fastening nut, The buckle fastening nut is connected with a pressing buckle fixing screw, and one end of the pressing buckle passes through the connecting seat and is connected with the pressing buckle fixing screw.

Further, a third graphite shaft sleeve is connected to the side wall of one end of the hexagonal shaft close to the rotor shaft, the outer side of the third graphite shaft sleeve is provided with a first ceramic shaft sleeve, and the water dividing part includes a pressure bearing seat. , the pressure bearing seat is arranged on the outer side of the first ceramic bushing, the pressure bearing seat is fitted with a zirconia friction seat, the zirconia friction seat is connected with a silicon carbide friction plate, and the hexagonal shaft is An impeller is connected to the side wall, the impeller is arranged on the upper side of the silicon carbide friction plate, the upper side of the impeller is provided with a graphite floating limit friction plate, and the graphite floating limit friction plate is arranged on the hexagonal outside of the shaft.

Further, the end of the hexagonal shaft away from the rotor shaft is provided with an extruding chamber, and the inner side of the extruding chamber is sequentially provided with a fourth graphite bushing and a second ceramic bushing, the second ceramic bushing and The hexagonal shafts are in contact, and the upper side of the fourth graphite shaft sleeve is provided with a shaft sleeve blocking piece, and a screw is connected between the shaft sleeve blocking piece and the hexagonal shaft.

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

By arranging a shielded structure outside the multi-stage pump motor, the present invention increases the lift of the multi-stage pump, at the same time, the multi-stage pump is not restricted by submersible pressure, can be used in deep diving, and can also increase the rotational speed, reduce the number of impellers, and ensure the overall stability and durability.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments described in the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without any creative effort.

1 is a cross-sectional view of a high-pressure high-efficiency multi-stage pump driven by a shielded permanent magnet high-speed motor according to an embodiment of the present invention;

Fig. 2 is a structural representation at A in Fig. 1;

Fig. 3 is the structural representation at B in Fig. 1;

Fig. 4 is a structural representation at C in Fig. 1;

Fig. 5 is the structural representation at D in Fig. 1;

Fig. 6 is the structural representation at E in Fig. 1;

Fig. 7 is the structural representation at F in Fig. 1;

Fig. 8 is the structural representation at G in Fig. 1;

Fig. 9 is a structural representation at H in Fig. 1;

Fig. 10 is a structural representation at I place in Fig. 1;

FIG. 11 is a schematic diagram of the structure at J in FIG. 1 .

In the picture: 1. Motor part, 101. Motor base, 102. Bottom cover, 103. Bottom cover fastening screws, 104. Baffle plate, 105. Filter cotton, 106. Rotor shaft, 107. Fixing nut, 108. Cooling Water impeller, 109. The first graphite bushing, 110. The first spiral water groove, 111. The first alloy bearing, 112. The first friction plate seat, 113. The alloy universal fine-tuning friction plate, 114. The 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 stopper Run up the shaft sleeve, 124. The second graphite shaft sleeve, 125. The second spiral water tank, 126. The second alloy bearing, 127. The motor upper cover, 128. The connecting plug, 129. The cable, 130. The second friction plate seat , 131. Skeleton shaft seal, 132. Ceramic friction plate, 133. Third graphite friction plate, 134. Connection seat, 135. Buckle fastening nut, 136. Driver, 137. Power cord, 2. Pump section, 201 .Spline sleeve, 202. Hexagonal shaft, 203. The third graphite sleeve, 204. The first ceramic sleeve, 205. Pressure bearing seat, 206. Zirconia friction seat, 207. Silicon carbide friction plate, 208. Impeller, 209. Graphite floating limit friction plate, 210. Extrusion chamber, 211. Fourth graphite bushing, 212. Second ceramic bushing, 213. Bushing stopper, 214. Screw, 215. Volute casing, 216 .Press the buckle, 217. Press the buckle to set the screw.

Detailed ways

The present invention will be described in detail below with reference to the various embodiments shown in the accompanying drawings. However, these embodiments do not limit the present invention, and structural, method or functional changes made by those skilled in the art according to these embodiments are all included in the protection scope of the present invention.

The present invention discloses a high-voltage and high-efficiency multi-stage pump driven by a shielded permanent magnet high-speed motor. Referring to FIGS. 1-11 , it includes a motor part 1 and a pump part 2 .

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 , and a baffle plate is provided on the motor base 101 104, a filter cotton 105 is arranged between the baffle 104 and the bottom cover 102.

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

Specifically, a first alloy bearing 111 is welded on the side wall of the rotor shaft 106 , a first graphite bushing 109 is arranged on the outer side of the first alloy bearing 111 , and a first spiral water groove 110 is drilled in the first graphite bushing 109 . A graphite bushing 109 is in contact with the motor base 101 .

Referring to FIGS. 1-11 , 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 outer side of the rotor in sequence, a casing 118 is connected to the motor base 101 , and the inner wall of the casing 118 is A DC high-speed coil 117 is connected.

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

In addition, a connection plug 128 is connected to the motor end cover 121, and a cable 129 is electrically connected to the connection plug 128. One end of the cable 129 is connected to a driver 136, and a power cord 137 is connected to the driver 136. There are a first friction part and a second friction part.

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

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

Referring to FIGS. 1 to 11 , the end of the rotor shaft 106 away from the bottom cover 102 is provided with a connecting portion, and the connecting portion includes a second friction plate seat 130 , and multiple friction plate seats 130 are connected to the motor upper cover 127 . The friction plate seat is fastened with screws, the inner side of the second friction plate seat 130 is provided with a skeleton shaft seal 131, the skeleton shaft seal 131 is arranged on the outer side of the rotor shaft 106, and the upper side of the second friction plate seat 130 is provided with a ceramic friction plate 132, The second friction plate seat 130 is provided with protrusions, the inner side of the ceramic friction plate 132 is provided with grooves, the protrusions and the grooves are arranged in cooperation with each other, the upper side of the ceramic friction plate 132 is provided with a third graphite friction plate 133, and the third friction plate 133 is provided on the upper side of the ceramic friction plate 132. The graphite friction plate 133 is connected with the spline sleeve 201 .

Among them, the motor upper cover 127 is connected with a connecting seat 134, the connecting seat 134 is connected with the water dividing part and the volute casing 215, the inner side of the connecting seat 134 is provided with a buckle tightening nut 135, and the buckle tightening screw The cap 135 is connected with a compression strap fixing screw 217 , and one end of the compression strap 216 is connected to the compression strap fixing screw 217 through the connecting seat 134 .

Preferably, a water inlet filter is connected to the connection seat 134 .

1-11, the pump part 2 includes a spline sleeve 201, the spline sleeve 201 is connected with the connecting part, the spline sleeve 201 is provided with a hexagonal shaft 202, and one end of the hexagonal shaft 202 is located in the splined sleeve 201 The impeller shaft fixing screw is connected, and the side wall of one end of the hexagonal shaft 202 close to the rotor shaft 106 is connected with a third graphite bushing 203 , and the outer side of the third graphite bushing 203 is provided with a first ceramic bushing 204 .

Preferably, the upper side of the spline sleeve 201 is provided with a height adjustment pad, and the height adjustment pad is arranged between the spline sleeve 201 and the third graphite shaft sleeve 203 .

Among them, the spline sleeve 201 is provided with a spline groove, and the spline groove is provided with a spline.

The hexagonal shaft 202 is connected with a plurality of water dividing parts, the water dividing part includes a pressure bearing seat 205, the pressure bearing seat 205 is arranged on the outer side of the first ceramic bushing 204, and the pressure bearing seat 205 is engaged with a zirconia friction The seat 206, the zirconia friction seat 206 is connected with a silicon carbide friction plate 207, the side wall of the hexagonal shaft 202 is connected with an impeller 208, the impeller 208 is arranged on the upper side of the silicon carbide friction plate 207, and the upper side of the impeller 208 is provided with graphite The upward floating limit friction plate 209 and the graphite upward floating limit friction plate 209 are arranged on the outer side of the hexagonal shaft 202 .

In addition, the end of the hexagonal shaft 202 away from the rotor shaft 106 is provided with a press-out chamber 210, and the inner side of the press-out chamber 210 is sequentially provided with a fourth graphite bushing 211 and a second ceramic bushing 212, and the second ceramic bushing 212 and the hexagonal shaft 202 is in contact, the upper side of the fourth graphite bushing 211 is provided with a bushing blocking piece 213 , and a screw 214 is connected between the bushing blocking piece 213 and the hexagonal shaft 202 .

Specifically, a volute casing 215 is provided on the outer side of the water dividing part, an upper part of the volute casing 215 is connected with a press-out chamber 210 , and a plurality of compression straps 216 are connected between the press-out chamber 210 and the connecting part.

In specific use, the cooling water impeller 108 is sucked into the medium from the bottom cover 102 and transported through the filter cotton 105, and enters the motor through the first spiral water groove 110 in the first graphite bushing 109 to lubricate the first graphite bushing 109, A friction plate seat 112, an alloy universal fine-tuning friction plate 113, a first graphite friction plate 114, a ceramic anti-slip upper sleeve 123, a second graphite sleeve 124 and a second alloy bearing 126 are cooled by the motor upper cover 127 The medium flows out from the outflow hole, takes away the heat of the motor, and lubricates the friction parts. The motor rotor is made of embedded magnetic steel 115, the stator is made of DC high-speed coil 117, and the two ends of the rotor shaft 106 are welded with stainless steel sheets 120, and stainless steel sleeves 116 and stainless steel are used. The sheet 120 is welded to seal the rotor, the stator is welded and sealed with the shell 118, the motor end cover 121, and the stainless steel thin-walled shielding sleeve 122, and the epoxy resin 119 is potted inside. The first alloy bearing 111 and the second alloy bearing 126 are welded on the rotor shaft 106. The first graphite bushing 109 between the motor base 101 and the second graphite bushing 124 on the motor upper cover 127 run radially to fit the first graphite friction plate 114 on the end face of the rotor and the first graphite friction sheet 114 mounted on the motor base 101. The alloy universal fine-tuning friction plate 113 bears the axial thrust;

In addition, the upper part of the rotor shaft 106 is equipped with a ceramic anti-slip upper sleeve 123 and the second graphite shaft sleeve 124 to rub against the rotor to prevent the rotor from running up, and the outer part of the rotor shaft 106 is equipped with a skeleton shaft seal 131 to prevent sediment from entering;

Specifically, the bottom of the groove on the ceramic friction plate 132 is in the shape of a concave arc, which cooperates with the protrusion on the second friction plate seat 130 to fine-tune the axial error. The sleeve 201 and the weight of the rotor shaft 106, the inner hole of the third graphite sleeve 203 is prepared with an inner hexagonal hole, which is sleeved on the hexagonal shaft 202, and runs radially with the third graphite sleeve 203 installed on the pressure bearing seat 205. The zirconium friction seat 206 is tightly fitted on the pressure bearing seat 205, and 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 withstand the axial pressure from the impeller 208, and the volute casing 215 is installed on the On the outer stop of the pressure-bearing seat 205, the upper part of the volute casing 215 is equipped with a water-division cover, and a set of pressure-bearing friction components is also assembled in the middle of the water-diversion cover to withstand the axial thrust generated by the second impeller 208, and so on. , A stainless steel sheet is installed on the water distribution cover, which is in close contact with the water inlet of the impeller 208, so as 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, which is installed in the middle of the water distribution cover. The lower end of the ceramic friction plate 132 is rubbed to limit the damage to the flying top caused by the impeller 208 floating up during startup and acceleration;

The second ceramic bushing 212 rotates radially with the fourth graphite bushing 211 installed in the middle of the extrusion chamber 210 , the second ceramic bushing 212 is fixed by the bushing stopper 213 and the screw 214 , and the volute casing 215 is installed outside The impeller barrel, its length should be considered when preparing the impeller barrel, not only to meet the pressing force of the impeller 208, but also to ensure the verticality of the entire series of impellers 208, the four evenly distributed pressing buckles 216 pass through the buckles on the connecting seat 134 With holes, it is fastened with the zipper fastening nut 135 and the zipper set screw 217 welded on the end of the zipper 216, the cable 129 is fixed on the impeller barrel, the driver 136 is placed on the power cord 137 and the wire The middle of the cable 129 is convenient to control the operation of the pump.

It will be apparent to those skilled in the art that the present invention is not limited to the details of the above-described exemplary embodiments, but that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments are to be regarded in all respects as illustrative and not restrictive, and the scope of the invention is to be defined by the appended claims rather than the foregoing description, which are therefore intended to fall within the scope of the claims. All changes within the meaning and scope of the equivalents of , are included in the present invention. Any reference signs in the claims shall not be construed as limiting the involved claim.

In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only includes an independent technical solution, and this description in the specification is only for the sake of clarity, and those skilled in the art should take the specification as a whole , the technical solutions in each embodiment can also be appropriately combined to form other implementations that can be understood by those skilled in the art.

Claims (10)

1. a high-pressure high-efficiency multistage pump driven by a shielded permanent magnet high-speed motor, characterized in that it comprises a motor part (1) and a pump part (2), and the motor part (1) is connected with the pump part (2) ; Wherein, the motor part (1) comprises a motor base (101), a bottom cover (102) is provided on the lower side of the motor base (101), and a rotor shaft (106) is rotated inside the motor base (101). A rotor is connected to the side wall of the rotor shaft (106), the outer side of the rotor is sequentially provided with a magnetic steel (115) and a stainless steel sleeve (116), and a casing (118) is connected to the motor base (101). ), a DC high-speed coil (117) is connected to the inner wall of the casing (118), a motor end cover (121) is provided on the upper side of the DC high-speed coil (117), and the DC high-speed coil (117) is close to One side of the stainless steel sleeve (116) is provided with a stainless steel thin-walled shielding sleeve (122). A filling cavity is formed, an epoxy resin (119) is arranged in the filling cavity, a connection plug (128) is connected to the motor end cover (121), and a cable is electrically connected to the connection plug (128) (129), one end of the cable (129) is connected with a driver (136), the driver (136) is connected with a power cord (137), and both ends of the rotor are respectively provided with a first friction part and a second friction part two friction parts, the end of the rotor shaft (106) away from the bottom cover (102) is provided with a connecting part; The pump part (2) includes a spline sleeve (201), the spline sleeve (201) is connected with the connecting part, and a hexagonal shaft (202) is arranged in the spline sleeve (201), and the The hexagonal shaft (202) is connected with a plurality of water dividing parts, the outer side of the water dividing part is provided with a volute casing (215), and the upper part of the volute casing (215) is connected with a press-out chamber (210) , a plurality of compression buckles (216) are connected between the extrusion chamber (210) and the connecting part. 2. The high-voltage and high-efficiency multistage pump driven by a shielded permanent magnet high-speed motor according to claim 1, wherein a plurality of The bottom cover is fastened with screws (103), the motor base (101) is provided with a baffle plate (104), and a filter cotton (105) is arranged between the baffle plate (104) and the bottom cover (102). 3. The high-pressure high-efficiency multistage pump driven by a shielded permanent magnet high-speed motor according to claim 2, wherein a side wall of the rotor shaft (106) close to the baffle plate (104) is connected with a A fixing nut (107), the rotor shaft (106) is located on the inner wall of the motor base (101) and is connected with a cooling water impeller (108), and the cooling water impeller (108) is arranged on the fixing nut (107) the upper side. 4. The high-pressure high-efficiency multistage pump driven by a shielded permanent magnet high-speed motor according to claim 3, wherein a first alloy bearing (111) is welded on the side wall of the rotor shaft (106), The outer side of the first alloy bearing (111) is provided with a first graphite bushing (109), a first spiral water groove (110) is drilled in the first graphite bushing (109), and the first graphite bushing (109) is in contact with the motor base (101). 5. The high-pressure high-efficiency multistage pump driven by a shielded permanent magnet high-speed motor according to claim 4, wherein the first friction part is provided between the rotor and the motor base (101) , 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) An alloy universal fine-tuning friction plate (113) and a first graphite friction plate (114) are arranged in sequence, the first graphite friction plate (114) is welded with the rotor shaft (106), and the upper and lower ends of the rotor are Stainless steel sheet (120) is welded. 6. The high-pressure high-efficiency multistage pump driven by a shielded permanent magnet high-speed motor according to claim 1, wherein the second friction part comprises a ceramic anti-slip upper sleeve (123), and the ceramic anti-slip The upper shaft sleeve (123) is welded with the rotor shaft (106), the upper side of the ceramic upper shaft sleeve (123) is provided with a second alloy bearing (126), and the second alloy bearing (126) A second graphite shaft sleeve (124) is arranged on the outside of the second graphite shaft sleeve (124), a second spiral water groove (125) is excavated in the second graphite shaft sleeve (124), and a motor on the outside of the second graphite shaft sleeve (124) is provided. A cover (127), the motor upper cover (127) is arranged on the upper side of the motor end cover (121), and a plurality of connecting screws are connected between the motor upper cover (127) and the motor end cover (121), The motor upper cover (127) is provided with cooling medium outflow holes. 7 . The high-pressure high-efficiency multistage pump driven by a shielded permanent magnet high-speed motor according to claim 6 , wherein the connecting portion comprises a second friction plate seat ( 130 ), the second friction plate seat A plurality of friction plate seat fastening screws are connected between (130) and the motor upper cover (127), the inner side of the second friction plate seat (130) is provided with a frame shaft seal (131), the frame shaft A seal (131) is arranged on the outer side of the rotor shaft (106), a ceramic friction plate (132) is arranged on the upper side of the second friction plate seat (130), and a ceramic friction plate (132) is arranged on the second friction plate seat (130) There are protrusions, the inner side of the ceramic friction plate (132) is provided with grooves, the protrusions and the grooves are arranged in cooperation with each other, and the upper side of the ceramic friction plate (132) is provided with a third graphite friction plate (133 ), the third graphite friction plate (133) is connected with the spline sleeve (201). 8. The high-pressure high-efficiency multistage pump driven by a shielded permanent magnet high-speed motor according to claim 7, wherein a connecting seat (134) is connected to the motor upper cover (127), and the connecting seat (134) is connected with both the water dividing part and the volute casing (215), the inner side of the connecting seat (134) is provided with a buckle fastening nut (135), and the buckle is fastened The nut (135) is connected with a compression strap fixing screw (217), and one end of the compression strap (216) is connected with the compression strap fixing screw (217) through the connecting seat (134) . 9 . The high-pressure high-efficiency multistage pump driven by a shielded permanent magnet high-speed motor according to claim 1 , wherein the hexagonal shaft ( 202 ) is connected with a side wall of one end close to the rotor shaft ( 106 ). 10 . A third graphite bushing (203), the outer side of the third graphite bushing (203) is provided with a first ceramic bushing (204), the water dividing part includes a pressure bearing seat (205), the pressure bearing seat (205) is arranged on the outer side of the first ceramic bushing (204), the pressure bearing seat (205) is fitted with a zirconia friction seat (206), and the zirconia friction seat (206) is connected with a carbonized friction seat (206). A silicon friction plate (207), 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), and the impeller ( The upper side of 208) is provided with a graphite floating limit friction plate (209), and the graphite floating limit friction plate (209) is arranged on the outer side of the hexagonal shaft (202). 10 . The high-pressure high-efficiency multistage pump driven by a shielded permanent magnet high-speed motor according to claim 9, characterized in that, one end of the hexagonal shaft (202) away from the rotor shaft (106) is provided with a press-out chamber (210), the inner side of the extrusion chamber (210) is sequentially provided with a fourth graphite bushing (211) and a second ceramic bushing (212), the second ceramic bushing (212) and the hexagonal The shaft (202) is in contact, and the upper side of the fourth graphite shaft sleeve (211) is provided with a shaft sleeve stopper (213), and a screw (213) is connected between the shaft sleeve stopper (213) and the hexagonal shaft (202). 214).

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