A canned electric pump that is convenient for winding to be connected to an external power supply

Abstract

A shielded electric pump that is convenient for winding to be connected to an external power source, comprising: a pump housing provided with a stator cavity for accommodating a stator assembly, a circuit board and a side cover for supplying power to the winding of the stator assembly, a radially protruding annular columnar peripheral edge of the outer shell of the pump housing, and a mounting cavity for accommodating the circuit board after the side cover closes the peripheral edge; the characteristic is that it also includes a wiring board fixed to one axial end of the stator assembly, a connector plug-in pair fixed to the wiring board and coupled along the radial direction thereof, and an input socket; the lead-out wire of the winding is electrically connected to the wiring board; the pump housing is provided with a through hole that radially connects the stator cavity and the mounting cavity, and the connector plug-in pair passes through the through hole to electrically connect the wiring board and the circuit board; the input socket is fixed to the pump housing, and its pin is electrically connected to the circuit board and extends out of the mounting cavity. This design is conducive to assembly, avoiding the short circuit or leakage of the lead-out wire of the stator assembly winding due to damage caused by pulling the wire, and is particularly conducive to the design and manufacture of a shielded electric pump with a pump structure in which each end of the motor shaft drives a pump.

Description

Technical Field

[0001] The invention relates to a canned electric pump which is convenient for connecting winding lead wires to an external power supply, and its IPC classification number is H02K11 / 00. Background Art

[0002] The circuit board of the current shielded electric pump is usually fixed at one axial end of the stator assembly and arranged in the stator cavity. However, due to the radial area limitation of the pump casing of the shielded electric pump, some circuit boards with complex circuits and large areas are difficult to install in the stator cavity. The solution to the above problem is to radially provide an installation cavity for accommodating the circuit board on the side wall of the pump casing, and to provide a through hole connecting the stator cavity and the installation cavity. When assembling the structure of this design, the lead wire of the winding of the stator assembly located in the stator cavity needs to be pulled out across the through hole and then connected to the circuit board in the installation cavity and then connected to the external power supply. During the wire pulling process, the lead wire is easily scratched by the insulation, resulting in faults such as short circuit or leakage.

[0003] For relevant terminology and common knowledge, please refer to the Mechanical Engineering Handbook and Electrical Engineering Handbook published in 1983 or 1997 by the Machinery Industry Press, as well as the national standards GB / T 7021 "Terminology of Centrifugal Pumps", GBT 4210 "Electrical Terminology - Electromechanical Components for Electronic Equipment" and GB 17465.1 "Appliance Couplers for Household and Similar Purposes - Part 1: General Requirements". Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a canned electric pump which is convenient for connecting the winding to an external power supply.

[0005] The technical solution adopted by the present invention is:

[0006] A shielded electric pump that is convenient for windings to be connected to an external power source, comprising: a pump housing provided with a stator cavity for accommodating a stator assembly, a circuit board for supplying power to the windings of the stator assembly, a rotor assembly and a side cover, the outer shell of the pump housing having a radially protruding annular cylindrical peripheral edge, the side cover sealing the peripheral edge to form a mounting cavity for accommodating the circuit board; the characteristic is that it also includes a wiring board fixed to one axial end of the stator assembly, a connector plug pair fixed to the wiring board and coupled along the radial direction of the pump, and an input socket; the lead wire of the winding is electrically connected to the wiring board; the pump housing is provided with a through hole that connects the stator cavity and the mounting cavity along the radial direction of the pump, the connector plug pair passes through the through hole to electrically connect the wiring board and the circuit board; the input socket is fixed to the pump housing, and its pin is electrically connected to the circuit board and extends out of the mounting cavity.

[0007] The design is formed from the winding lead wire - the terminal board fixed at one end of the winding - the radial plug-in connector plug-in pair fixed to the terminal board - the circuit board located in the installation cavity on the radial side of the terminal board - the installation structure of the input socket fixed on the pump body, for the winding lead wire to be connected to the external power supply. The above design is conducive to assembly, thereby improving production efficiency and quality, especially that they are all rigid or simple connections, avoiding the short circuit or leakage caused by the damage of the stator winding lead wire of the traditional design stator assembly due to the pulling wire, and is conducive to the sealing of the shielded pump.

[0008] Furthermore, the connector plug-in pair passes through the through hole to electrically connect the wiring board and the circuit board. Specifically, the connector plug-in pair includes an electrical connector with pins along the radial direction of the pump and a female contact fixed to the wiring board to provide a radial plug-in port, and the female contact is electrically connected to the wiring board; the pin of the electrical connector passes through the through hole and is inserted into the female contact to form an electrical connection, and the other end is electrically connected to the circuit board. This design can realize the electrical connection between the winding in the stator cavity and the circuit board in the installation cavity by plugging the electrical connector and the female contact, which is conducive to realizing automated assembly.

[0009] Furthermore, the input socket is located on the radial outer surface of the installation cavity close to the axis of the pump housing, and the conductor providing electrical connection includes a conductive column connected to the circuit board and a plug bent from the conductive column, and the plug extends outward from the installation cavity along the pump axis. This design reduces the radial occupied area of ​​the outer contour after the canned electric pump is connected to the external power plug, which is conducive to the assembly of the canned electric pump on pump equipment with a smaller space.

[0010] Furthermore, the female contact includes a base with a through hole and a metal conductive member fixed on the base, the metal conductive member includes a metal conductive plate and a first elastic sheet and a second elastic sheet bent from the metal conductive plate to be arranged opposite to each other, the metal conductive plate is electrically connected to the wiring board, and a gap is formed between the first elastic sheet and the second elastic sheet for the insertion of the plug pin. This structure improves the tightness of the connection between the metal conductive member and the plug pin, and prevents the plug pin and the metal conductive plate from being disconnected due to poor contact.

[0011] Furthermore, the first elastic sheet and the second elastic sheet are provided with tooth-shaped undercuts at the ends away from the plug pins, and the undercuts are clamped on the inner wall surface of the base. The structure uses undercuts to fasten the metal conductive part to the base, preventing the metal conductive part from shifting in the base after the electrical connector is repeatedly plugged in and out of the base, making it difficult to insert the plug pin, and facilitating the maintenance and disassembly of the canned motor pump.

[0012] Furthermore, the base has a cylindrical support platform axially protruding toward the end face of the terminal board, and the support platform is closely attached to the axial end face of the end plate. This design is conducive to transmitting the force of the plugging and unplugging process to the pump housing when the electrical connector is plugged into the female contact, thereby avoiding the plugging and unplugging force directly acting on the female contact and causing damage to it.

[0013] Furthermore, the electrical connector includes an insulating seat for fixing the pin insulation, a raised mounting column on the outer shell, a mounting portion for the mounting column to pass through the insulating seat, and the electrical connector is clamped or fused to the pump shell with the mounting portion; or a pump shell mounting portion of the pump shell is recessed, and an insulating seat mounting column for inserting the pump shell mounting portion is provided on the insulating seat, and the electrical connector is clamped to the pump shell mounting portion through the insulating seat mounting column. This structure prevents the point connector from falling off during operation and improves the stability of the electrical connection between the electrical connector and the socket. Furthermore, the shielded electric pump that facilitates the connection of the winding to an external power supply also includes a capacitor and a capacitor bracket, the capacitor is fixedly mounted on the capacitor bracket, and is clamped to the circuit board through the capacitor bracket. This structure separates the capacitor and the circuit board, which is beneficial to reducing the operating temperature of the circuit board.

[0014] A further design is to apply the structure of connecting the winding to an external power source to a shielded electric pump with a pump structure driven at each end of the motor shaft. The electric pump also includes a pressure plate, a first pump cover, and a second pump cover. The upper impeller and the lower impeller are fixed at each axial end of the rotating shaft of the rotor assembly. The first pump cover and the pump housing are matched at one axial end to form a first impeller cavity for accommodating the upper impeller. The pump housing is formed with a stator cavity for accommodating the stator assembly and a tubular inner shell with openings at both ends. The inner cavity of the inner shell accommodates the rotor assembly. The pressure plate is fixed at the other axial end of the pump housing and seals the stator cavity watertightly. The second pump cover and the pressure plate are matched to form a second impeller cavity for accommodating the lower impeller. This design solves the problem that the radial cross-section of the stator cavity is reduced and the circuit board is difficult to be waterproofly integrated and installed on the pump body because the shielded electric pump has a pump structure driven at each end of the motor shaft.

[0015] The shielded electric pump with a pump structure driven by each of the two ends of the motor shaft is further designed in that the pressure plate is fixedly arranged at the other axial end of the pump housing and the specific structure of the stator cavity is as follows: an annular fourth sealing ring is arranged between the outer shell of the pump housing and the pressure plate; an annular pressure plate groove is arranged on the side of the pressure plate facing the stator cavity, the inner shell is inserted and installed in the pressure plate groove, and a fifth sealing ring is arranged between the inner shell and the pressure plate; wherein the fifth sealing ring is a hollow cylindrical structure with an annular groove, or the axial single-side cross-section of the fifth sealing ring is an "L"-shaped structure, and the fifth sealing ring is close to the cylindrical surface of the pressure plate groove and has multiple annular fifth sealing ring ribs. This design is convenient for installation, and the fifth sealing ring increases the sealing area between the inner shell and the pressure plate, and improves the sealing between the inner shell and the pressure plate. In order to better understand and implement the present invention, it is described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of a canned motor pump according to a first embodiment of the present invention;

[0017] Figure 2 Schematic diagram of the exploded structure of a canned motor pump according to a first embodiment of the present invention;

[0018] Figure 3is a cross-sectional view of a canned motor pump according to a first embodiment of the present invention;

[0019] Figure 4 yes Figure 3 A partial enlarged view of middle A;

[0020] Figure 5 is another cross-sectional view of the canned motor pump according to the first embodiment of the present invention;

[0021] Figure 6 It is a schematic diagram of the three-dimensional structure of the input socket of the canned motor pump according to the first embodiment of the present invention;

[0022] Figure 7 It is a structural schematic diagram of a stator assembly installation wiring board of a canned motor pump according to a first embodiment of the present invention;

[0023] Figure 8 It is a structural schematic diagram of a female contact of a canned motor pump according to a first embodiment of the present invention;

[0024] Fig. 9 It is a schematic structural diagram of a metal conductive part of a canned motor pump according to a first embodiment of the present invention;

[0025] Fig.10 1 is a schematic structural diagram of a terminal block after a female contact is installed in a canned motor pump according to a first embodiment of the present invention;

[0026] Fig.11 It is a schematic structural diagram of an electrical connector of a canned electric pump according to a first embodiment of the present invention;

[0027] Fig.12 1 is a schematic diagram of the three-dimensional structure of a pump casing of a canned motor pump according to a first embodiment of the present invention;

[0028] Fig.13 1 is a schematic diagram of the axial cross-sectional structure of a canned motor pump according to a second embodiment of the present invention;

[0029] Fig.14 yes Fig.13 A partial enlarged view of B in the middle;

[0030] Fig.15 It is a schematic diagram of the three-dimensional structure of the pump casing of the canned motor pump according to the second embodiment of the present invention;

[0031] Fig.16 It is a three-dimensional structural schematic diagram of the fifth sealing ring of the canned motor pump of the present invention;

[0032] Fig.17 is a schematic diagram of the axial cross-sectional structure of the fifth sealing ring after application optimization of the canned motor pump according to the second embodiment of the present invention;

[0033] Fig.18 yes Fig.17 A partial enlarged view of middle C;

[0034] Fig.19 It is a three-dimensional structural schematic diagram of the fifth sealing ring of the canned motor pump after optimization;

[0035] Among them: Among them: 10-stator cavity, 10'-stator cavity, 11-rotor cavity, 20-installation cavity, 20-installation cavity', 40-impeller cavity, 60-screw, 70-rotor cavity, 70'-rotor cavity, 80-upper impeller cavity, 90-lower impeller cavity, 100-pump casing, 100'-pump casing, 110-inner cylinder, 110'-inner cylinder, 120-outer casing, 120'-outer casing, 121-surrounding edge, 121'-surrounding edge, 122-through hole, 122'-through hole hole, 150-input socket, 151-conductor, 152-conductive column, 153-pin, 154-input socket housing, 160-end plate, 161-end plate hole, 160'-end plate, 170-mounting column, 200-pressing plate, 210-pressing plate groove, 300-rotor assembly, 300'-rotor assembly, 310-rotating shaft, 310'-rotating shaft, 320-magnetic core, 330-impeller, 331-upper impeller, 332-lower impeller, 340-connecting Connector, 400-circuit board, 410-electric connector, 411-pin, 412-insulating seat, 413-notch, 420-capacitor, 430-capacitor bracket, 500-side cover, 600-pump cover, 610-first water inlet, 620-first water outlet, 700-bottom plate, 810-first sealing ring, 820-second sealing ring, 830-third sealing ring, 840-fourth sealing ring, 850-fifth sealing ring, 850'-fifth sealing ring, 851′-fifth sealing ring rib, 900-stator assembly, 910-stator core, 920-coil frame, 930-stator winding, 940-stator pin, 950-connection board, 960-female contact, 970-metal conductive part, 971-metal conductive plate, 972-first elastic sheet, 973-second elastic sheet, 974-first elastic sheet undercut, 975-second elastic sheet undercut, 980-base, 981-base through hole, 982-support platform DETAILED DESCRIPTION

[0036] Embodiment 1:

[0037] See Figures 1 to 3 The shielded electric pump of the embodiment of the present invention comprises a pump housing 100, a rotor assembly 300 rotatably mounted on the pump housing, an impeller 330, a circuit board 400, a side cover 500, a stator assembly 900 fixedly mounted on the pump housing, a terminal board 950, an input socket 150, a pump cover 600, a bottom plate 700 and a connector pair. The rotor assembly 300 comprises a rotating shaft 310, a magnetic core 320 and a connecting member 340 connecting the two, and the impeller 330 is fixed on the rotating shaft 310. Figure 3 and Fig.12The pump housing 100 is made of plastic molding, and includes an annular end plate 160, an inner cylinder 110 connected to the end plate 160 and open at one end, an outer shell 120 arranged on the outer periphery of the inner cylinder 110 and connected to the end plate 160, and an annular surrounding edge 121 protruding from the outer surface of the outer shell 120. A through hole 122 is arranged on the outer surface of the outer shell 120 of the pump housing 100, and the outer surface of the inner cylinder 110, the inner surface of the outer shell 120 and the inner end surface of the end plate 160 facing away from the axial direction of the impeller form a stator cavity 10 for installing the stator assembly 900, and the cylindrical inner cavity of the inner cylinder 110 forms a rotor cavity 70 for accommodating the rotating shaft assembly 300. The pump cover 600 is provided with a first water inlet 610 for water inlet and a first water outlet 620 for water outlet. The pump cover 600 and the end plate 160 of the pump housing are matched to form an impeller cavity 40. A first sealing ring 810 is provided between the pump cover 600 and the pump housing 100, and the impeller 330 is provided in the impeller cavity 40. The bottom plate 700 is provided at one end of the pump housing 100, and a second sealing ring 820 is provided between the two. The above structure can also be changed to eliminate the bottom plate 700 and directly fill the stator cavity with epoxy resin.

[0038] See Figure 3 and Figure 7 The stator assembly 900 includes a stator core 910, a coil frame 920 fixed on the stator core, a winding 930 wound on the coil frame, and a stator pin 940 fixed on the coil frame. The terminal block 950 is arranged at one end of the stator assembly in the axial direction and is welded to the stator pin 940, and the lead wires of the winding 930 are electrically connected to the terminal block 950 through the stator pin 940. Of course, as other embodiments, the stator assembly can eliminate the stator pins and directly weld the lead wires of the windings to the terminal block.

[0039] See Figure 3 and 4 After the canned electric pump of the embodiment of the present invention is assembled, the stator assembly 900 is installed in the stator cavity 10, the side cover 500 is fixedly installed on the surrounding edge 121, and a third sealing ring 830 is arranged between the two. After the side cover 500 is installed, it forms an installation cavity 20 with the surrounding edge 121, and the circuit board 400 is installed in the installation cavity 20. The through hole 122 connects the stator cavity 10 and the installation cavity 20, and the connector plug-in pair passes through the through hole 122 to electrically connect the terminal block 950 and the circuit board 400. The input socket 150 is fixedly installed on the pump housing 100, and its conductor 151 is electrically connected to the circuit board 400 and extends out of the installation cavity. The canned electric pump of the present invention, which is convenient for the winding to be connected to an external power supply, is provided with a terminal block on the stator assembly, and the lead wires of the winding are extended to the outside of the stator cavity of the pump body by using parts such as the terminal block, the connector plug-in pair, the circuit board and the input socket. The canned motor pump of the above design has a simple and reliable structure, and can avoid faults such as short circuit or leakage caused by damage to the stator winding lead wire of the stator assembly due to wire pulling during the assembly process.

[0040] See Figure 2and Figure 4 , the connector plug-in pair passes through the through hole to electrically connect the wiring board and the circuit board. Specifically, the connector plug-in pair includes an electrical connector 410 provided with a pin 411 and a female contact 960. The female contact 960 is fixed on the wiring board 950, and the two are electrically connected. After the female contact 960 is electrically connected to the wiring board 950, the female contact 960 provides a radial plug-in port for the wiring board 950, one end of the pin 411 of the electrical connector 410 passes through the through hole 122 and is inserted into the female contact 960 and is electrically connected to the female contact 960, and the other end is electrically connected to the circuit board 400. Of course, as other embodiments, the female contact can be fixed on the circuit board and electrically connected to the circuit board circuit, the electrical connector is fixed on the wiring board, one end of its pin is electrically connected to the wiring board, and the other end is inserted into the female contact fixed to the circuit board, or other conductive plug-in structures introduced in the "Electrical Engineering Handbook" are used to electrically connect the wiring board and the circuit board.

[0041] As a preferred embodiment of the input socket, see Figure 1 , 5 and Figure 6 The input socket 150 is fixedly assembled on the radial outer surface of the mounting cavity close to the axis of the pump casing, and includes a housing 154 and a conductor 151 fixed on the housing. The conductor 151 includes an electric post 152 connected to the circuit board 400 and a plug 153 bent from the first conductive post. This design facilitates the design of the conductive posts into the same structure, which is beneficial to the production of the input socket. Furthermore, the plug 153 leads the conductive post 152 out of the mounting cavity 20 along the axial direction of the pump. This design connects the lead wire of the winding in sequence through the terminal block, the female contact, the electrical connector, the circuit board and the input socket, and then extends out from the input socket's plug along the axial direction of the pump.

[0042] See Figure 8 and Fig. 9 As a preferred embodiment of the female contact of the shielded electric pump according to the embodiment of the present invention, the female contact 960 includes a metal conductive member 970 and a base 980 with a base through hole 981. The metal conductive member 970 includes a metal conductive plate 971 and a first elastic sheet 972 and a second elastic sheet 973 that are bent from the metal conductive plate and are arranged opposite to each other, and a gap is formed between the first elastic sheet 972 and the second elastic sheet 973 for inserting the plug pin of the power supply connector. After the metal conductive member 970 is fixed to the base 980, the plug pin 411 can be inserted into the insertion gap formed by the first elastic sheet 972 and the second elastic sheet 973 through the base through hole 981. Other forms of female contacts introduced in the "Electrical Engineering Handbook" can also be used.

[0043] Furthermore, in order to facilitate the disassembly and assembly of the shielded electric pump during maintenance, the first elastic sheet 972 and the second elastic sheet 973 are respectively provided with a tooth-shaped first elastic sheet undercut 974 and a second elastic sheet undercut 975 at the end away from the pin, and the first elastic sheet undercut 974 and the second elastic sheet undercut 975 are respectively snapped onto the base 980.

[0044] See Figure 4 , Figure 8 and Fig.10 The end surface of the base 980 facing the terminal board 950 is also provided with an axially protruding columnar support platform 982. The support platform 982 of the base 980 is tightly attached to the axial end surface of the end plate 160 in the assembled state. This structure is conducive to transmitting the plugging and unplugging force to the pump housing when the electrical connector is plugged into the female contact, avoiding the plugging and unplugging force directly acting on the female contact and causing damage to it. Furthermore, in order to make it easier for the electrical connector to be plugged into the female contact, the axial end surface of the end 160 of the pump housing is also provided with an end plate hole 161. During assembly, the support platform 982 is inserted and installed in the end hole 161.

[0045] To prevent the electrical connector from falling off during operation, the electrical connection stability between the electrical connector and the female contact is improved. Fig.12 The outer shell of the pump housing 100 is protruded with a columnar mounting column 170. Fig.11 The electrical connector 410 includes a plug pin 410 and an insulating seat 412 that separates and fixes the plug pin 410. The insulating seat 412 is provided with a mounting portion for mounting a mounting column, and the electrical connector is clamped or fused to the pump casing through the mounting portion. The mounting portion is designed as an insulating seat notch 413 or an insulating seat mounting hole. The above design can also be changed to a pump casing mounting portion with a concave shape provided on the outer shell of the pump casing, and the insulating seat is provided with an insulating seat mounting column for inserting into the pump casing mounting portion, and the electrical connector is clamped to the pump casing mounting portion through the insulating seat mounting column. The pump casing mounting portion can be designed as a mounting hole located in the pump casing.

[0046] To solve the problem of high heating of the shielded motor pump circuit board. Figure 2 The shielded electric pump of the embodiment of the present invention is further provided with a capacitor 420 and a capacitor support 430. Figure 3 During assembly, the capacitor 420 is fixedly mounted on the capacitor bracket 430, and the capacitor bracket 430 is clamped on the circuit board 400. This structure separates the capacitor and the circuit board, preventing the capacitor with high heat generation from transferring heat to the circuit board, which is beneficial to reducing the temperature of the circuit board during operation.

[0047] Embodiment 2:

[0048] The difference between the shielded electric pump of this embodiment and the shielded electric pump of the first embodiment is that the two ends of the motor shaft drive a pump structure, so that both ends of the electric pump shaft can pump water. The structure of the winding lead wire of this electric pump connected to the external power supply is the same as that of the first embodiment. Fig.13The shielded electric pump of this embodiment has a pump housing 100' and a rotating shaft 310' of a rotor assembly 300' that are different from the structures of the above-mentioned embodiments. The shielded electric pump of this embodiment also includes a pressure plate 200, a first pump cover 600, a second pump cover 700, an upper impeller 331 and a lower impeller 332. The rotor assembly 300' includes a rotating shaft 310' and a magnetic core 320 fixed on the rotating shaft. Fig.13 and Fig.17 The pump housing 100' is made by one-step injection molding, and includes an annular end plate 160', a tubular inner housing 110' connected to the end plate 160' and open at both ends, an outer housing 120' arranged on the outer periphery of the inner housing 110' and connected to the end plate 160', and the first pump cover 600 and the end plate 160' of the pump housing are matched to form a first impeller chamber 80 for accommodating the upper impeller 331. The inner housing 110', the outer housing 120' and the end plate 160' of the pump housing 100' form a stator chamber 10', and the end plate 160' and the hollow inner cavity of the inner housing 110' form a rotor chamber 70'. During assembly, the stator assembly 900 is fixed in the stator cavity 10′, and the rotor assembly 300′ is accommodated in the rotor cavity 70′. One end of the rotating shaft 310′ passes through the opening of the inner shell 100′ at one end of the end plate 160′ and extends to the outside of the end plate 160′. The pressure plate 200 is fixed to the other end of the pump casing and watertightly seals the stator cavity 10′. In this way, the other end of the rotating shaft 310′ passes through the central through hole 230 provided on the pressure plate 200 and extends to the outside of the pressure plate. The upper impeller 331 and the lower impeller 332 are fixed at both ends of the rotating shaft 310′ respectively. The first pump cover 600 and the end plate 160′ of the pump casing are covered to form a first impeller cavity 80 for accommodating the upper impeller 331, and the second pump cover 700 and the pressure plate 200 are covered to form a second impeller cavity 90 for accommodating the lower impeller 332. The rotation of the rotating shaft 310' drives the upper impeller 331 and the lower impeller 332 to rotate simultaneously, realizing the double-sided drainage of the centrifugal pump. This design solves the problem that the radial cross-section of the stator cavity is reduced due to the drainage at both ends of the axial direction of the shielded motor pump, and the circuit board is difficult to be waterproofly integrated and installed on the pump body.

[0049] See Fig.14 The specific structure of the pressure plate fixedly arranged at the other axial end of the pump housing and watertightly sealing the stator cavity is as follows: the canned motor pump further includes an annular fourth sealing ring 840 arranged between the outer shell 120' of the pump housing 100' and the pressure plate 200 and a fifth sealing ring 850 arranged between the inner shell 110' and the pressure plate 200. Figures 13 to 16 The fifth sealing ring 850 includes a fifth sealing ring body 852 in the shape of a hollow ring and an annular groove 851 axially arranged on the fifth sealing ring body 852. An annular pressing plate groove 210 is arranged on the side of the pressing plate 200 facing the stator cavity 20'. Fig.14During assembly, the fourth sealing ring 840 is arranged between the outer shell 120' of the pump casing and the pressure plate 200. After the inner shell 110' of the pump casing is sleeved on the annular groove 851 of the fifth sealing ring 850, the inner shell 110' installed with the fifth sealing ring 850 is tightly inserted into the pressure plate groove 210. Since the radial cross-section of the inner shell is relatively small, if a conventional O-ring is sleeved on the inner shell, it is easy for the inner shell to deform and cause water leakage. The above design utilizes a sealing ring with a hollow annular structure with a groove to wrap the inner shell as a whole and embed it into the pressure plate groove. While increasing the sealing area between the inner shell and the pressure plate, it can prevent the deformation of the inner shell from causing gaps and causing water leakage, thereby improving the reliability of the seal. Of course, see Figures 17 to 19 , the fifth sealing ring 850' can be designed to have an "L"-shaped structure in its axial single-side cross section. In specific implementation, the fifth sealing ring 850' is a hollow annular column, and its axial single-side cross section is "L"-shaped. The fifth sealing ring 850' includes a plurality of annular fifth sealing ring ribs 851' protruding on the circumferential surface of the fifth sealing ring 850'. An annular pressing plate groove 210 is provided on the side of the pressing plate 200 facing the stator cavity. During assembly, the fifth sealing ring 850' is placed in the pressing plate groove 210, and then the inner shell 110 of the pump body is inserted and the fifth sealing ring 850' is pressed tightly in the pressing plate groove 210. This design facilitates the gas in the pressing plate groove to be discharged from the gap between the contact surface of the inner shell and the pressing plate groove when the inner shell is inserted and installed in the pressing plate groove, which is conducive to assembly. Of course, as other embodiments, the pressing plate can be welded or use other annular sealing rings to seal the stator cavity opening of the pump housing. The present invention is not limited to the above-mentioned embodiments. If various changes or modifications to the present invention do not depart from the spirit and scope of the present invention, and if these changes and modifications fall within the scope of the claims and equivalent technologies of the present invention, the present invention is also intended to include these changes and modifications.

Claims

1. A canned motor pump that is convenient for connecting windings to an external power supply, comprising: A pump housing (100, 100´) is provided with a stator cavity (10, 10´) for accommodating a stator assembly (900), a circuit board (400) for supplying power to a winding (930) of the stator assembly (900), a rotor assembly (300, 300´) and a side cover (500); the outer shell (120, 120´) of the pump housing (100, 100´) has a radially protruding annular columnar peripheral edge (121, 121´); the side cover (500) closes the peripheral edge (121, 121´) to form an installation cavity (20, 20´) for accommodating the circuit board (400); the pump housing is characterized in that it also includes a terminal block (950) fixed to one axial end of the stator assembly (900), a terminal block (950) fixed to the terminal block (95 0) and a connector plug-in pair coupled in the radial direction of the pump, and an input socket (150); the lead wire of the winding (930) is electrically connected to the terminal block (950); the pump housing (100, 100´) is provided with a through hole (122, 122´) connecting the stator cavity (10, 10´) and the installation cavity (20, 20´) in the radial direction of the pump, and the connector plug-in pair passes through the through hole (122, 122´) to electrically connect the terminal block (950) and the circuit board (400); the input socket (150) is fixed to the pump housing (100, 100´), and its pin (153) is electrically connected to the circuit board (400) and extends out of the installation cavity, and the connector plug-in pair includes a pin (411) provided in the radial direction of the pump. ) and a female contact (960) fixed to a wiring board to provide a radial plug-in port, the female contact (960) being electrically connected to the wiring board (950), the electrical connector (410) comprising an insulating seat (412) for insulating and fixing a plug pin (411), the female contact (960) comprising a base (980) with a through hole (981) and a metal conductive member (970) fixed to the base, the metal conductive member (970) comprising a metal conductive plate (971) and a first elastic sheet (972) and a second elastic sheet (973) bent from the metal conductive plate to be arranged opposite to each other, the metal conductive plate (971) being electrically connected to the wiring board (950), the A gap is formed between the first elastic sheet (972) and the second elastic sheet (973) for inserting the plug pin (411); the plug pin (411) of the electrical connector (410) passes through the through hole (122, 122´) and is inserted into the female contact (960) to form an electrical connection, and the other end is electrically connected to the circuit board (400); the housing has a raised mounting column (170); the insulating seat (412) is provided with a mounting portion for the mounting column (170) to pass through; the electrical connector is clamped or fused to the pump housing with the mounting portion; or the housing of the pump housing has a recessed pump housing mounting portion; the insulating seat is provided with an insulating seat mounting column for inserting the pump housing mounting portion; the electrical connector is clamped to the pump housing mounting portion through the insulating seat mounting column.

2. The canned motor pump that is convenient for winding connection to an external power supply according to claim 1, characterized in that: The input socket (150) is located on the radial outer surface of the installation cavity (20) close to the axis of the pump housing, and the conductor (151) providing electrical connection comprises a conductive column (152) connected to the circuit board and a plug (153) bent from the conductive column, wherein the plug (153) extends outward from the installation cavity (20) along the pump axis.

3. The canned motor pump that is convenient for winding to be connected to an external power supply according to claim 1, characterized in that: The first elastic sheet (972) and the second elastic sheet (973) are provided with tooth-shaped undercuts at the ends away from the insertion pins, and the undercuts are clamped on the inner wall surface of the machine base (980).

4. The canned motor pump that is convenient for winding connection to an external power supply according to claim 2 or 3, characterized in that: The machine base (980) has a columnar support platform (982) axially protruding toward the end surface of the wiring board (950), and the support platform (982) is closely attached to the axial end surface of the end plate (160).

5. The canned motor pump that is convenient for winding connection to an external power supply according to claim 1, characterized in that: It also includes a capacitor (420) and a capacitor bracket (430), wherein the capacitor (420) is fixedly mounted on the capacitor bracket (430) and is clamped to the circuit board (400) through the capacitor bracket (430).

6. The canned motor pump that is convenient for winding to be connected to an external power supply according to claim 1, characterized in that: The invention also comprises a pressure plate (200), a first pump cover (600), and a second pump cover (700); an upper impeller (331) and a lower impeller (332) are fixed at two axial ends of the rotating shaft (310´) of the rotor assembly; the first pump cover (600) and the pump casing (100´) are matched at one axial end to form a first impeller chamber (80) for accommodating the upper impeller (331); the pump casing (100´) is formed with a tubular inner casing (110´) with openings at both ends; the inner chamber of the inner casing (110´) accommodates the rotor assembly (300´); the pressure plate (200) is fixed at the other axial end of the pump casing and watertightly seals the stator chamber (10´); the second pump cover (700) and the pressure plate (200) are matched to form a second impeller chamber (90) for accommodating the lower impeller (332).

7. The canned motor pump that is convenient for winding connection to an external power supply according to claim 6, characterized in that: The specific structure of the pressure plate (200) being fixedly arranged at the other axial end of the pump housing and watertightly sealing the stator cavity (10´) is as follows: an annular fourth sealing ring (840) is arranged between the outer shell (120´) of the pump housing and the pressure plate (200); an annular pressure plate groove (210) is arranged on the side of the pressure plate (200) facing the stator cavity, the inner shell (110´) is inserted and installed in the pressure plate groove (210), and a fifth sealing ring (850, 850´) is arranged between the inner shell (110´) and the pressure plate (200); wherein the fifth sealing ring (850) is a hollow columnar structure with an annular groove, or the axial single-side cross-section of the fifth sealing ring (850´) is an "L"-shaped structure, and the fifth sealing ring (850´) is closely attached to the cylindrical surface of the pressure plate groove (210) and has a plurality of annular fifth sealing ring convex ribs (851´).

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