CN210033862U - Centrifugal pump without inner leakage - Google Patents

Abstract

The utility model relates to a centrifugal pump without inner leakage, including water pump shell, water cavity isolation bearing, water pump impeller, motor casing, motor stator, rotor cover, controller housing, control circuit board, rotor shaft and electric motor rotor, the water pump shell is fixed at the motor casing front end, the rear end at motor casing is fixed to the controller housing, and motor stator installs in the motor casing, is provided with the water hole on motor casing's the preceding terminal surface, and the rotor shaft is fixed in the motor casing, and the axle center of rotor shaft is provided with a rotor shaft centre bore that runs through the rotor shaft front and back end, and water pump impeller installs at the front end of rotor shaft and lies in the water pump casing, and electric motor rotor installs in the inside through-hole of rotor cover, is provided with the clearance between electric motor rotor's excircle and. This no inner leakage centrifugal pump can realize the no backward flow unidirectional flow of water pump internal cooling rivers, has stopped the emergence of inside leakage, reduces electric centrifugal pump's consumption, improves electric centrifugal pump's work efficiency.

Description

Centrifugal pump without inner leakage

Technical Field

The utility model relates to a centrifugal pump, concretely relates to be applied to automobile cooling system's centrifugal pump that leaks in nothing.

Background

With the development of electric automobiles, power components such as a driving motor and a power battery of the electric automobile need to be cooled by a cooling system to ensure the working performance and working reliability of the power components, the cooling system of the electric automobile does not have a mechanical water pump driven by an engine of a traditional fuel oil automobile, an electric cooling water pump driven by electric power is the primary choice, a motor controller for the work of the motor and the driving motor can generate a heating problem in the working process to influence the working reliability of the electric water pump, therefore, a forced cooling system is arranged in the pump to forcibly cool the motor and the driving controller, an impeller of the centrifugal pump is a high-speed rotating motion part, a water pump shell is a static part, a certain gap is required between the impeller of the centrifugal pump and the water pump shell to ensure the high-speed rotation of the impeller, and the gap easily causes water in a high-pressure water outlet cavity to flow back to a low-pressure water inlet cavity, resulting in energy and flow losses.

Chinese patent publication No. CN203488425U discloses a centrifugal pump sealing structure and a centrifugal pump, which comprise a pump casing, a sealing ring and an impeller; the middle part of the front cover plate is provided with a sealing ring and an impeller water inlet, the sealing ring is protruded on the surface of the front cover plate, and the impeller water inlet is positioned in the sealing ring; a pump shell water inlet penetrating through the pump shell is formed in the position, corresponding to the impeller water inlet, of the pump shell, and an annular groove is formed in the inner wall of the pump shell and along the edge of the pump shell water inlet; the sealing ring comprises a first annular body and a second annular body which are connected, the outer diameters of the first annular body and the second annular body are the same, the inner diameter of the first annular body is smaller than that of the second annular body to form a stepped inner wall of the sealing ring, the sealing ring is embedded in an annular groove of the pump shell, the sealing ring is sleeved in the sealing ring, and the outer diameter of the sealing ring is between the inner diameter of the first annular body and the inner diameter of the second annular body. The sealing structure of the centrifugal pump is high in assembly precision, long in service life and less in inner leakage, but the sealing structure is only suitable for the centrifugal pump with an ordinary structure and cannot be suitable for an electric cooling water pump with an internal cooling pipeline.

SUMMERY OF THE UTILITY MODEL

The utility model provides a not enough to prior art, the utility model provides a leak centrifugal pump in nothing can realize the non-return unidirectional flow of water pump internal cooling rivers, has stopped the emergence of inside leakage, reduces electric centrifugal pump's consumption, improves electric centrifugal pump's work efficiency.

In order to realize the technical scheme, the utility model provides a centrifugal pump leaks in no, include: bearing, water pump impeller, water cavity isolation bearing, water pump impeller, motor casing, motor stator, rotor cover, controller housing, control circuit board, rotor shaft and electric motor rotor, the water pump casing is fixed at the motor casing front end, the rear end at motor casing is fixed to the controller housing, and motor stator installs in motor casing its characterized in that: the water through hole is arranged on the front end face of the motor shell, the rotor shaft is fixed in the motor shell through the rotor shaft rear bearing and the rotor shaft front bearing, the axis of the rotor shaft is provided with a rotor shaft center hole penetrating through the front end and the rear end of the rotor shaft, the water pump impeller is arranged at the front end of the rotor shaft and is positioned in the water pump shell, impeller axis bosses are arranged on the front end face and the rear end face of the axis part of the water pump impeller, stepped center holes penetrating through the front end face and the rear end face of the water pump impeller are arranged on the impeller axis bosses on the front end face and the rear end face, the front end face of the rotor shaft is abutted against steps in the center holes on the impeller axis bosses of the water pump impeller, the front end of the rotor shaft center hole is communicated with the center holes penetrating through the front end face and the rear end face, the motor rotor is installed in the inside through-hole of rotor housing, is provided with the clearance between motor rotor's excircle and the hole of rotor housing, and the bearing is installed in the inside tang of bearing frame of controller housing behind the rotor shaft, be provided with the breach on the bearing frame, control circuit board installs in the controller housing, and the water cavity is kept apart the bearing and is installed the intracavity that intakes in the water pump housing, and both ends are equipped with sealed lid around the bearing is kept apart to the water cavity, and the bearing inner race tight fit ground that the bearing was kept apart to the water cavity is fixed in the water pump housing.

Preferably, the water pump housing is fixed on the motor housing in a screw connection mode, a water pump housing sealing ring is installed on a joint surface of the water pump housing and the motor housing, inlet water of a water pump housing inlet cavity flows to an inlet of the water pump impeller, the water pump impeller sucks the water inlet cavity in the water pump housing to form a low-pressure water cavity, a water outlet cavity in the water pump housing is formed into a high-pressure water cavity by pumping of the water pump impeller, and a water inlet cavity position of the water pump housing, in which the water cavity isolation bearing is installed, is used for isolating the high-pressure water cavity from.

Preferably, the water pump impeller is provided with a main water pump impeller and a subsidiary water pump impeller which are integrally distributed side by side, a boss is arranged at a water inlet of the water pump impeller, a water outlet cavity of the subsidiary water pump impeller is arranged between the outer edge surface of the main water pump impeller and the outer edge surface of the subsidiary water pump impeller, a water inlet of the subsidiary water pump impeller is arranged on the rear end surface of the subsidiary water pump impeller, and a water inlet cavity of the subsidiary water pump impeller is arranged between the water inlet of the subsidiary water pump impeller and the boss of the shaft center of the rear impeller of the subsidiary water pump impeller.

Preferably, an installation lug is arranged on the inner end face of the motor shell, a sealing ring at the front end of the rotor sleeve is sleeved on the installation lug, a bearing seat for installing a front bearing of the rotor shaft is arranged at the axis position on the inner end face of the motor shell, the front bearing of the rotor shaft is arranged in the bearing seat, and a reinforcing rib is arranged between the sealing ring installation lug of the motor shell and the inner bearing seat of the motor shell and connected with each other.

Preferably, be provided with a motor casing front end boss of taking the breach on motor casing's the preceding terminal surface, the inside of motor casing front end boss is provided with a boss cavity, the breach department of motor casing front end boss is provided with a step of sinking, and water pump impeller installs in the boss cavity of motor casing front end boss, is provided with a small gap between the rear end face of water pump main impeller and the step of sinking of motor casing front end boss, and the installation cavity of water pump auxiliary impeller is enclosed into with motor casing boss cavity inside wall in the rear end outer fringe of water pump main impeller, and water pump auxiliary impeller installs in motor casing boss cavity, and water pump main impeller installs in the motor casing boss cavity outside, and the water inlet of water pump main impeller is linked together with the intake antrum in the water pump casing.

Preferably, the motor stator is installed in the inner cavity mounting hole of the motor shell in a tight fit manner, an outer edge boss with a sealing ring mounting groove is arranged on the front end face of the controller housing, the motor shell sealing ring is installed in the sealing ring mounting groove of the outer edge boss at the front end of the controller housing, a sealing ring mounting lug with a rotor sleeve rear end sealing ring mounting groove is arranged inside the outer edge boss at the front end of the controller housing, and a rotor sleeve rear end sealing ring is installed in the sealing ring mounting groove of the rotor sleeve sealing ring mounting lug.

Preferably, be provided with the bearing frame of installation rotor shaft rear bearing in the sealing washer installation lug of controller housing, be provided with the breach on the bearing frame, be provided with the strengthening rib between sealing washer installation lug on the controller housing and the bearing frame and be connected, be provided with the step on the inside tang of bearing frame of controller housing, be provided with the heat dissipation muscle that links to each other with the bearing frame on the bearing frame inner chamber bottom surface of controller housing, the bearing is installed in the inside tang of bearing frame of controller housing behind the rotor shaft, and the rear end face of rotor shaft rear bearing supports and leans on the inside tang step of bearing frame of controller housing.

Preferably, the control circuit board is mounted in the controller housing in a screw fastening manner, the bottom surface of the control circuit board abuts against the rear end surface of the inner cavity of the controller housing, and the controller end cover is tightly fitted into the rear end orifice of the controller housing.

Preferably, the front end face of the motor rotor abuts against the boss end face of the rotor shaft, the rear end of the motor rotor is arranged to protrude out of the rear end face of the motor stator and is provided with a dislocation protruding portion with a section of length, the dislocation protruding portion forms dislocation of the magnetic pole center on the circle of the motor rotor in the axial direction, the magnetic pole center deviates backwards from the magnetic pole center of the inner hole of the motor stator, and the motor stator is fixed in the motor shell in a tight fit mode.

Preferably, the front end hole spigot of the rotor sleeve is tightly sleeved on the outer edge of the front end sealing ring of the rotor sleeve, and the rear end hole spigot of the rotor sleeve is tightly sleeved on the outer edge of the rear end sealing ring of the rotor sleeve.

In the technical scheme, the water passing hole on the front end face of the motor shell, the water cavity from the front end face of the motor rotor to the front end face of the inside of the motor shell, the cooling water channel inside the motor rotor, the gap between the excircle of the motor rotor and the inner hole of the rotor sleeve, the water cavity from the rear end face of the motor rotor to the end face of the mounting lug of the sealing ring at the rear end of the rotor sleeve on the controller housing, the inner water cavity of the mounting lug of the sealing ring at the rear end of the rotor sleeve on the controller housing, the notch of the bearing seat on the controller housing, the inner cavity of the bearing seat on the controller housing, the central hole of the rotor shaft and the central hole of the water pump impeller form an internal forced cooling.

When the water pump works, the water inlet of the water pump auxiliary impeller forms suction negative pressure under the suction action of the water pump auxiliary impeller, inlet water of the water pump shell enters the central hole of the rotor shaft through the central hole of the water pump impeller to form internal cooling water flow, the internal cooling water flow flows backwards along the central hole of the rotor shaft, heat of the motor rotor is transferred to the internal cooling water flow in the central hole of the rotor shaft through heat conduction of the rotor shaft and is carried away along with the water flow, primary cooling of the motor rotor by the internal cooling water flow through the rotor shaft is realized, the internal cooling water flow flows out from the rear end of the central hole of the rotor shaft and then is washed onto the surfaces of a heat dissipation rib and an inner cavity of a bearing seat in a bearing seat of a controller housing, then the internal cooling water flow flows into an internal water cavity of a sealing ring at the rear end of a rotor sleeve on the controller housing from a gap of the bearing seat on the controller housing, and heat of a control circuit board is transferred, the internal cooling water flow is forced to cool the control circuit board through the controller housing, then the internal cooling water flow enters a gap between a cooling water channel inside the motor rotor and an inner hole between the excircle of the motor rotor and the inner hole of the rotor sleeve from the rear end face of the motor rotor to the end face of the mounting lug of the sealing ring at the rear end of the rotor sleeve on the controller housing, then the internal cooling water flow flows out from the front end of the motor rotor and enters a water cavity between the front end of the motor rotor and the inner front end face of the motor shell, the heat of the motor rotor is taken away again when the internal cooling water flow flows through the motor rotor to realize secondary cooling of the motor rotor, meanwhile, the heat of the motor stator is transferred to the internal cooling water flow through the heat conduction of the rotor sleeve and is taken away with the water flow, and the forced cooling of the motor stator by the internal cooling water flow through the rotor sleeve is realized, then the internal cooling water flow enters the water inlet cavity of the auxiliary impeller of the water pump from the water through hole at the front end of the motor shell through the water inlet of the auxiliary impeller of the water pump, the water is pumped to a water outlet cavity of the auxiliary impeller of the water pump by the auxiliary impeller of the water pump and then enters the water outlet cavity in the water pump shell from the gap of the boss at the front end of the motor shell, realize inside cooling water flow from the water pump casing water inlet by the water pump impeller's centre bore front end get into inside cooling water course to the one-way flow in the water outlet cavity of water pump impeller pump sending to the water pump casing in, the water pump impeller on the water pump impeller main impeller in with the water pump casing water inlet in the process of the play water cavity of water pump casing also be a rivers one-way flow's process, realized rivers and flow inside the water pump without flowing backward, the emergence of inside leakage has been stopped, the consumption of electric centrifugal pump has been reduced, the work efficiency of electric centrifugal pump has been improved.

The utility model provides a pair of leak centrifugal pump in no has beneficial effect to lie in: this centrifugal pump without internal leakage simple structure, design benefit, through the design to the cooling water pipeline in the pump body, self structure in the cooperation pump, make inside forced cooling's rivers unidirectional flow, and through the components and parts that generate heat, take away the heat of inside high temperature structure, the forced cooling of the inside high temperature structure of electric centrifugal pump has better been realized, the temperature rise of motor and controller has been suppressed effectively, avoid the overheated of motor and controller, ensure that electric centrifugal pump has highly reliable operational reliability, and realized rivers and flow in the inside no backward flow ground of water pump, the emergence of internal leakage has been stopped, the consumption of electric centrifugal pump has been reduced, the work efficiency of electric centrifugal pump has been improved.

Drawings

FIG. 1 is a sectional view of the pump structure of the present invention;

fig. 2 is a schematic view of the inner side structure of the motor housing according to the present invention;

fig. 3 is a schematic diagram of an outer side structure of a motor housing according to the present invention;

FIG. 4 is a schematic front side view of the impeller of the reclaimed water pump of the present invention;

FIG. 5 is a schematic diagram of the rear side structure of the impeller of the reclaimed water pump of the present invention;

fig. 6 is a schematic perspective view of the controller housing according to the present invention.

Wherein: 1. a water pump housing; 2. a water cavity isolation bearing; 3. a water pump impeller; 4. a water pump shell sealing ring; 5. a motor housing; 6. a rotor sleeve front end sealing ring; 7. a motor stator; 8. a rotor housing; 9. a controller housing; 10. a control circuit board; 11. a controller end cap; 12. a rotor shaft; 13. a rotor shaft rear bearing; 14. a rotor sleeve rear end sealing ring; 15. a motor rotor; 16. a motor shell sealing ring; 17. a rotor shaft front bearing; 1-1, a water pump shell water inlet cavity; 1-2, discharging a water cavity of a water pump shell; 3-1, a main impeller of the water pump; 3-2, a central hole of a water pump impeller; 3-3, a water inlet boss of a water pump impeller; 3-4, a water outlet cavity of the water pump auxiliary impeller; 3-5, a water inlet cavity of the auxiliary impeller of the water pump; 3-6, impeller axis boss; 3-7, a water inlet of a water pump auxiliary impeller; 3-8, pump auxiliary impeller; 5-1, installing a lug on a sealing ring of the motor shell; 5-2, a motor shell bearing seat; 5-3, water holes are formed in the front end of the motor shell; 5-4, reinforcing ribs between a mounting lug of a sealing ring of the motor shell and the bearing seat; 5-5, a boss at the front end of the motor shell; 5-6, and an inner cavity of a boss at the front end of the motor shell; 5-7, sinking steps of a boss at the front end of the motor shell; 9-1, a boss at the outer edge of the front end of the controller housing; 9-2, installing a lug on a sealing ring of a shell of the controller; 9-3, a gap of a bearing seat of a controller housing; 9-4, reinforcing ribs are arranged between the mounting lugs of the sealing ring of the controller cover shell and the bearing seat; 9-5, steps of a bearing seat of a controller housing; 9-6, a bearing seat of the controller housing; 9-7, heat dissipation ribs in a bearing seat cavity of the controller housing; 12-1, a central hole of the rotor shaft; 15-1, a motor rotor rear end dislocation protruding part; 15-2, a cooling water channel inside the motor rotor; 15-3, and a gap between the motor rotor and the rotor sleeve.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by a person skilled in the art without any inventive step are within the scope of the present invention.

Example (b): a centrifugal pump without internal leakage.

Referring to fig. 1 to 6, a centrifugal pump without inner leakage comprises a water pump housing 1, a water cavity isolation bearing 2, a water pump impeller 3, a water pump housing seal ring 4, a motor housing 5, a rotor housing front end seal ring 6, a motor stator 7, a rotor housing 8, a controller housing 9, a control circuit board 10, a controller end cover 11, a rotor shaft 12, a rotor shaft rear bearing 13, a rotor housing rear end seal ring 14, a motor rotor 15, a motor housing seal ring 16 and a rotor shaft front bearing 17, wherein the water pump housing 1 is fixed on the motor housing 5 in a screw connection manner, the water pump housing seal ring 4 is installed on the joint surface of the water pump housing 1 and the motor housing 5 for sealing, inlet water of a water pump housing inlet cavity 1-1 flows to an inlet of the water pump impeller 3, and the water pump impeller 3 pumps the water inlet cavity 1-1 in the water pump housing 1 to be a low, the water outlet cavity 1-2 in the water pump shell 1 becomes a high-pressure water cavity by the pumping of the water pump impeller 3, the water inlet cavity 1-1 part in the water pump shell 1 is provided with a water cavity isolation bearing 2 for isolating the high-pressure water cavity 1-2 from the low-pressure water cavity 1-1, the front end and the rear end of the water cavity isolation bearing 2 are provided with sealing covers, the water cavity isolation bearing 2 is a rolling ball bearing, and the outer ring of the bearing of the water cavity isolation bearing 2 is tightly fixed in the water pump shell 1 in a matching way;

referring to fig. 1, 4 and 5, a water pump impeller 3 is provided with a water pump main impeller 3-1 and a water pump auxiliary impeller 3-8 which are integrally arranged side by side, impeller axis bosses 3-6 are arranged on the front end surface and the rear end surface of the axis position of the water pump impeller 3, stepped central holes 3-2 penetrating the front end surface and the rear end surface of the water pump impeller 3 are arranged on the impeller axis bosses 3-6 on the front end surface and the rear end surface of the water pump impeller 3, a boss 3-3 is arranged at the water inlet of the water pump impeller 3, a water pump auxiliary impeller water outlet cavity 3-4 is arranged between the outer edge surface of the water pump main impeller 3-1 and the outer edge surface of the water pump auxiliary impeller 3-8, a water inlet 3-7 of the water pump auxiliary impeller 3-8 is arranged on the rear end surface of the water pump auxiliary impeller 3-8, and a water pump auxiliary impeller boss 3-6 A water inlet cavity 3-5 of the auxiliary impeller 3-8;

referring to fig. 1, 4 and 5, an installation lug 5-1 of a rotor sleeve front end seal ring 6 is arranged on the inner end surface of a motor shell 5, the rotor sleeve front end seal ring 6 is sleeved on the seal ring installation lug 5-1 of the motor shell 5, a bearing seat 5-2 for installing a rotor shaft front bearing 17 is arranged at the axle center on the inner end surface of the motor shell 5, the rotor shaft front bearing 17 is arranged in the bearing seat 5-2, a plurality of water through holes 5-3 are arranged on the front end surface of the motor shell 5, a reinforcing rib 5-4 is arranged between the seal ring installation lug 5-1 of the motor shell 5 and the inner bearing seat 5-2 of the motor shell 5 to be connected, the strength and the rigidity of the inner bearing seat 5-2 of the motor shell 5 are improved, a motor shell front end boss 5-5 with a notch is arranged on the front end surface of the motor, a boss cavity 5-6 is arranged inside a boss 5-5 at the front end of the motor shell, a sinking step 5-7 is arranged on the boss at the gap of the boss 5-5 at the front end of the motor shell, a water pump impeller 3 is arranged in the boss cavity 5-6 of the boss 5-5 at the front end of the motor shell, a small gap is arranged between the rear end surface of the main impeller 3-1 of the water pump and the sinking step 5-7 of the boss 5-5 at the front end of the motor shell, the outer edge of the rear end of the main impeller 3-1 of the water pump and the inner side wall of the boss cavity 5-6 of the motor shell enclose an installation cavity of an auxiliary impeller 3-8 of the water pump, the auxiliary impeller 3-8 of the water pump is arranged in the boss cavity 5-6 of the motor shell, the main impeller 3-1 of the water pump is arranged outside the boss cavity 5-6 of the motor shell, and;

referring to fig. 1 and 6, a motor stator 7 is tightly fitted into an inner cavity mounting hole of a motor housing 5, an outer edge boss 9-1 with a sealing ring mounting groove is arranged on the front end surface of a controller housing 9, a motor housing sealing ring 16 is mounted in the sealing ring mounting groove of the outer edge boss 9-1 at the front end of the controller housing 9, a sealing ring mounting lug 9-2 with a mounting groove of a rotor sleeve rear end sealing ring 14 is arranged inside the outer edge boss 9-1 at the front end of the controller housing 9, the rotor sleeve rear end sealing ring 14 is mounted in the sealing ring mounting lug 9-2 of the controller housing 9, a bearing seat 9-6 of a rotor shaft rear bearing 13 is further arranged inside the sealing ring mounting lug 9-2 of the controller housing 9, a gap 9-3 is arranged on the bearing seat 9-6 on the controller housing 9, a reinforcing rib 9-4 is arranged between a sealing ring mounting lug 9-2 on the controller housing 9 and a bearing seat 9-6 for connection, a step 9-5 is arranged on an inner spigot of the bearing seat 9-6 of the controller housing 9, a heat dissipation rib 9-7 connected with the bearing seat 9-6 is arranged on the bottom surface of an inner cavity of the bearing seat 9-6 of the controller housing 9, a rotor shaft rear bearing 13 is arranged in the inner spigot of the bearing seat 9-6 of the controller housing 9, and the rear end surface of the rotor shaft rear bearing 13 abuts against the step 9-5 of the inner spigot of the bearing seat 9-6 of the controller housing 9;

referring to fig. 1, a control circuit board 10 is installed in a controller housing 9 in a screw fastening manner, the bottom surface of the control circuit board 10 is attached to the rear end surface of an inner cavity of the controller housing 9, a controller end cover 11 is tightly fitted into a rear end hole of the controller housing 9, front and rear shaft journals of a rotor shaft 12 are respectively fitted into bearing holes of a rotor shaft rear bearing 13 and a rotor shaft front bearing 17, the shaft center of the rotor shaft 12 is provided with a rotor shaft center hole 12-1 penetrating through the front and rear ends of the rotor shaft 12, a water pump impeller 3 is tightly fitted at the front end of the rotor shaft 12, the front end surface of the rotor shaft 12 abuts against a step in a center hole 3-2 of an impeller shaft center boss 3-6 of the water pump impeller 3, the front end of the rotor shaft center hole 12-1 is communicated with a center hole 3-2 penetrating through the front and rear end surfaces of the water pump impeller 3, the, the motor rotor 15 is fixed on the rotor shaft 12 in a tight fit manner, the front end face of the motor rotor 15 is abutted against the boss end face of the rotor shaft 12, the rear end of the motor rotor 15 is arranged to be protruded out of the rear end face of the motor stator 7 and is provided with a dislocation protrusion part 15-1, the dislocation protrusion part 15-1 forms dislocation of a magnetic pole center on the excircle of the motor rotor 15 which deviates from the magnetic pole center of the inner hole of the motor stator 7 backwards in the axial direction, the motor is driven to operate by the magnetic field attraction of the magnetic pole of the inner hole of the motor stator 7 to the excircle magnetic pole of the motor rotor 15 when in operation, the magnetic pole of the inner hole of the motor stator 7 and the excircle magnetic pole of the motor rotor 15 are a pair of opposite magnetic pole pairs with opposite polarities, and the known theory of electromagnetism shows that for the opposite magnetic pole with a pair of magnetic pole centers dislocated, the magnetic force, the motor stator 7 is fixed in the motor shell 5 in a tight fit manner and cannot move, the dislocation of the magnetic pole center on the excircle of the motor rotor 15, which deviates from the magnetic pole center of the inner hole of the motor stator 7 backwards in the axial direction, enables the motor stator 7 to generate a forward magnetic field attraction force on the motor rotor 15, and the forward magnetic field attraction force of the motor rotor 15 is attracted to the water pump impeller 3 fixed on the rotor shaft 12 through the motor rotor 15 and the rotor shaft 12, the water pump impeller 3 has an axial force acting on the end surface of the water cavity isolation bearing 2, so that the joint state between the end surface of the boss 3-3 at the water inlet of the water pump impeller 3 and the end surface of the water cavity isolation bearing 2 is kept in the working process of the water pump, the good isolation of the water cavity isolation bearing 2 on the high-pressure water cavity 1-2 and the low-pressure water cavity 1-1 in the water pump shell 1 is realized, and the water in the high-pressure water cavity 1- The gap of the water pump is returned to the inner part of the low-pressure water cavity 1-1 in the water pump shell 1 to cause leakage; the motor rotor 15 is internally provided with a plurality of cooling water channels 15-2, the rotor sleeve 8 is arranged in the inner cavity of the motor stator 7, the motor rotor 15 is arranged in an internal through hole of the rotor sleeve 8, the front end hole spigot of the rotor sleeve 8 is tightly sleeved on the outer edge of the front end sealing ring 6 of the rotor sleeve, the rear end hole spigot of the rotor sleeve 8 is tightly sleeved on the outer edge of the rear end sealing ring 14 of the rotor sleeve, and a gap 15-3 is arranged between the outer circle of the motor rotor 15 and the inner hole of the rotor sleeve 8.

In the embodiment, a water through hole 5-3 on the front end surface of the motor shell 5, a water cavity between the front end surface of the motor rotor 15 and the inner front end surface of the motor shell 5, a cooling water channel 15-2 inside the motor rotor 15, a gap 15-3 between the outer circle of the motor rotor 15 and the inner hole of the rotor sleeve 8, a water cavity between the rear end surface of the motor rotor 15 and the end surface of the mounting lug 9-2 of the rotor sleeve rear end sealing ring 14 on the controller housing 9, an internal water cavity of a mounting lug 9-2 of a rotor sleeve rear end sealing ring 14 on a controller housing 9, a gap 9-3 of a bearing seat 9-6 on the controller housing 9, an inner cavity of the bearing seat 9-6 on the controller housing 9, a rotor shaft central hole 12-1 and a central hole 3-2 of a water pump impeller 3 form an internal forced cooling water path; in the actual working process, the suction action of the water pump auxiliary impeller 3-8 causes the water inlet 3-7 of the water pump auxiliary impeller to form suction negative pressure, the water inlet of the water pump shell 1-1 enters the rotor shaft central hole 12-1 through the central hole 3-2 of the water pump impeller 3 to form internal cooling water flow, the internal cooling water flow flows backwards along the rotor shaft central hole 12-1, the heat of the motor rotor 15 is transferred to the internal cooling water flow in the rotor shaft central hole 12-1 through the heat conduction of the rotor shaft 12 and is carried away with the water flow, the primary cooling of the motor rotor 15 by the internal cooling water flow through the rotor shaft 12 is realized, the internal cooling water flow flows out from the rear end of the rotor shaft central hole 12-1 and then is flushed to the heat dissipation ribs 9-7 in the bearing block 9-6 of the controller housing 9 and the surface of the inner cavity of the bearing block 9-6, then, the internal cooling water flow flows from the notch 9-3 of the bearing seat 9-6 on the controller housing 9 to the internal water cavity of the mounting lug 9-2 of the rotor sleeve rear end sealing ring 14 on the controller housing 9, the heat of the control circuit board 10 is transferred to the internal cooling water flow through the heat conduction of the controller housing 9 and carried away with the water flow, so that the internal cooling water flow performs forced cooling on the control circuit board 10 through the controller housing 9, then the internal cooling water flow enters the cooling water channel 15-2 inside the motor rotor 15 and the gap (15-3) between the excircle of the motor rotor 15 and the inner hole of the rotor sleeve 8 from the water cavity between the rear end face of the motor rotor 15 and the end face of the mounting lug 9-2 of the rotor sleeve rear end sealing ring 14 on the controller housing 9, and then the internal cooling water flow flows out from the front end of the motor rotor 15 and enters the front end of the motor rotor 15 and the inner front end face of the motor housing 5 In the water cavity, the heat of the motor rotor 15 is taken away again when the internal cooling water flow flows through the motor rotor 15 to realize secondary cooling of the motor rotor 15, meanwhile, the heat of the motor stator 7 is transferred to the internally cooled water flow through the heat conduction of the rotor sleeve 8 and is taken away along with the water flow, so that the internal cooling water flow carries out forced cooling on the motor stator 7 through the rotor sleeve 8, then the internal cooling water flow enters the water inlet cavity 3-5 of the water pump auxiliary impeller 3-8 from the water through hole 5-3 at the front end of the motor shell 5 through the water inlet 3-7 of the water pump auxiliary impeller 3-8, and then is pumped to the water outlet cavity 3-4 of the water pump auxiliary impeller from the water inlet 1-1 of the water pump shell through the central hole 3-2 at the front end of the water pump impeller 3 from the water inlet 1-1 of the water pump shell The process that the water flow enters the internal cooling water channel to the water pump auxiliary impeller 3-8 and is pumped to the water outlet cavity 1-2 in the water pump shell 1 is a one-way flow process, the main water flow in the water pump shell water inlet 1-1 is pumped to the water outlet cavity 1-2 in the water pump shell 1 by the main water pump impeller 3-1 on the water pump impeller 3 is also a one-way flow process of water flow, the water flow flows in the water pump without backflow, the occurrence of internal leakage is avoided, the power consumption of the electric centrifugal pump is reduced, the working efficiency of the electric centrifugal pump is improved, the heat of internal high-temperature structural parts is taken away by the one-way flow of the internal forced cooling water flow, the forced cooling of the internal high-temperature structural parts of the electric centrifugal pump is better realized, the temperature rise of a motor and a controller is effectively inhibited, the overheating of the motor and the controller is avoided, and.

The above description is a preferred embodiment of the present invention, but the present invention should not be limited to the disclosure of the embodiment and the accompanying drawings, and therefore, all equivalents and modifications that can be accomplished without departing from the spirit of the present invention are within the protection scope of the present invention.

Claims (10)

1. An internal leakage free centrifugal pump comprising: bearing, water pump impeller, water cavity isolation bearing, water pump impeller, motor casing, motor stator, rotor cover, controller housing, control circuit board, rotor shaft and electric motor rotor, the water pump casing is fixed at the motor casing front end, the rear end at motor casing is fixed to the controller housing, and motor stator installs in motor casing its characterized in that: the water through hole is arranged on the front end face of the motor shell, the rotor shaft is fixed in the motor shell through the rotor shaft rear bearing and the rotor shaft front bearing, the axis of the rotor shaft is provided with a rotor shaft center hole penetrating through the front end and the rear end of the rotor shaft, the water pump impeller is arranged at the front end of the rotor shaft and is positioned in the water pump shell, impeller axis bosses are arranged on the front end face and the rear end face of the axis part of the water pump impeller, stepped center holes penetrating through the front end face and the rear end face of the water pump impeller are arranged on the impeller axis bosses on the front end face and the rear end face, the front end face of the rotor shaft is abutted against steps in the center holes on the impeller axis bosses of the water pump impeller, the front end of the rotor shaft center hole is communicated with the center holes penetrating through the front end face and the rear end face, the motor rotor is installed in the inside through-hole of rotor housing, is provided with the clearance between motor rotor's excircle and the hole of rotor housing, and the bearing is installed in the inside tang of bearing frame of controller housing behind the rotor shaft, be provided with the breach on the bearing frame, control circuit board installs in the controller housing, and the water cavity is kept apart the bearing and is installed the intracavity that intakes in the water pump housing, and both ends are equipped with sealed lid around the bearing is kept apart to the water cavity, and the bearing inner race tight fit ground that the bearing was kept apart to the water cavity is fixed in the water pump housing.

2. The centrifugal pump of claim 1, wherein: the water pump shell is fixed on the motor shell in a screw connection mode, a water pump shell sealing ring is installed on the joint surface of the water pump shell and the motor shell, inlet water of a water pump shell inlet cavity flows to an inlet of the water pump impeller, a water inlet cavity in the water pump shell is made into a low-pressure water cavity by suction of the water pump impeller, a water outlet cavity in the water pump shell is made into a high-pressure water cavity by pumping of the water pump impeller, and a water inlet cavity position of the water pump shell, in which the water cavity isolation bearing is installed, is used for isolating the high-.

3. The centrifugal pump of claim 2, wherein: the water pump impeller is provided with a water pump main impeller and a water pump auxiliary impeller which are integrally distributed side by side, a boss is arranged at a water inlet of the water pump impeller, a water outlet cavity of the water pump auxiliary impeller is arranged between the outer edge surface of the water pump main impeller and the outer edge surface of the water pump auxiliary impeller, a water inlet of the water pump auxiliary impeller is arranged on the rear end face of the water pump auxiliary impeller, and a water inlet cavity of the water pump auxiliary impeller is arranged between the water inlet of the water pump auxiliary impeller and the boss of the axle center of the rear impeller of the water pump impeller.

4. The centrifugal pump of claim 3, wherein: the motor comprises a motor shell, a rotor sleeve, a rotor shaft front bearing, a sealing ring, a mounting lug, a bearing seat, a reinforcing rib and a sealing ring mounting lug, wherein the mounting lug is arranged on the inner end face of the motor shell, the sealing ring at the front end of the rotor sleeve is sleeved on the mounting lug, the bearing seat for mounting the rotor shaft front bearing is arranged at the axis position on the inner end face of the motor shell, the rotor shaft front bearing is arranged in the bearing seat.

5. The centrifugal pump of claim 4, wherein: be provided with a motor casing front end boss of taking the breach on motor casing's the preceding terminal surface, the inside of motor casing front end boss is provided with a boss cavity, the breach department of motor casing front end boss is provided with a step of sinking, water pump impeller installs in the boss cavity of motor casing front end boss, be provided with a slit between the rear end face of water pump main impeller and the step of sinking of motor casing front end boss, the rear end outer fringe of water pump main impeller and motor casing boss cavity inside wall enclose into the installation cavity of water pump auxiliary impeller, water pump auxiliary impeller installs in motor casing boss cavity, water pump main impeller installs in the motor casing boss cavity outside, the water inlet of water pump main impeller is linked together with the intake antrum in the water pump casing.

6. The centrifugal pump without internal leakage according to claim 1 or 5, wherein: the motor stator is installed in the inner cavity mounting hole of the motor shell in a tight fit mode, an outer edge boss with a sealing ring mounting groove is arranged on the front end face of the controller shell, a motor shell sealing ring is installed in the sealing ring mounting groove of the outer edge boss at the front end of the controller shell, a sealing ring mounting lug with a rotor sleeve rear end sealing ring mounting groove is arranged inside the outer edge boss at the front end of the controller shell, and a rotor sleeve rear end sealing ring is installed in the sealing ring mounting groove of the rotor sleeve sealing ring mounting lug.

7. The centrifugal pump of claim 6, wherein: the sealing ring mounting lug of the controller housing is internally provided with a bearing seat for mounting a rear bearing of the rotor shaft, the bearing seat is provided with a notch, a reinforcing rib is arranged between the sealing ring mounting lug on the controller housing and the bearing seat and connected with the bearing seat, a step is arranged on a spigot inside the bearing seat of the controller housing, a heat dissipation rib connected with the bearing seat is arranged on the bottom surface of an inner cavity of the bearing seat of the controller housing, the rear bearing of the rotor shaft is mounted in the spigot inside the bearing seat of the controller housing, and the rear end face of the rear bearing of the rotor shaft is abutted against the step on the spigot inside the bearing seat of the.

8. The centrifugal pump of claim 7, wherein: the control circuit board is installed in the controller housing in a screw fastening mode, the bottom surface of the control circuit board is attached to the rear end face of the inner cavity of the controller housing, and the controller end cover is tightly installed in the rear end hole of the controller housing in a matching mode.

9. The centrifugal pump of claim 8, wherein: the front end face of the motor rotor is abutted against the boss end face of the rotor shaft, the rear end of the motor rotor is arranged to protrude out of the rear end face of the motor stator and is provided with a dislocation protruding portion with a section of length, the dislocation protruding portion forms dislocation of a magnetic pole center on a motor rotor circle which deviates from a magnetic pole center of a motor stator inner hole backwards in the axial direction, and the motor stator is fixed in the motor shell in a tight fit mode.

10. The centrifugal pump of claim 9, wherein: the front end hole spigot of the rotor sleeve is tightly sleeved on the outer edge of the front end sealing ring of the rotor sleeve, and the rear end hole spigot of the rotor sleeve is tightly sleeved on the outer edge of the rear end sealing ring of the rotor sleeve.

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