CN-117189621-B - Reversing and pressurizing structure of cooling liquid in motor and motor

CN117189621BCN 117189621 BCN117189621 BCN 117189621BCN-117189621-B

Abstract

The application provides a reversing pressurization structure of internal cooling liquid of a motor and the motor, which comprise an internal pipeline, wherein the internal pipeline is communicated with a region I and a region II and is used for guiding cooling liquid from the region I to the region II or guiding cooling liquid from the region II to the region I, a pressurizing device is connected with the internal pipeline and is used for pressurizing the internal cooling liquid of the internal pipeline, a differential pressure reversing mechanism is used for switching the pressurizing direction of the cooling liquid of the internal pipeline to be forward or reverse according to the pressure difference between the region II and the region III, when the cooling liquid pressure of the region II is larger than the region III, the pressurizing direction of the cooling liquid of the internal pipeline is switched to be forward so as to pressurize the cooling liquid of the region I, and when the cooling liquid pressure of the region II is smaller than the region III, the pressurizing direction of the cooling liquid of the region II is switched to be reverse so as to pressurize the cooling liquid of the region I. According to the application, under the condition that the internal cooling circulation loop of the motor commutates, the internal cooling liquid can be pressurized.

Inventors

XU LIJIAO
BAI YUXING
ZOU XUEPENG
YU LIZI
HAN YI
QIU NING
ZANG LIGUO

Assignees

南京工程学院

Dates

Publication Date: 20260505
Application Date: 20230907

Claims (9)

1. The reversing and pressurizing structure for the cooling liquid in the motor is characterized by being arranged in an inner cavity of the motor, wherein a region I, a region II and a region III are arranged in the inner cavity of the motor according to the forward circulation sequence of the cooling liquid; The reversing supercharging structure comprises: An internal pipe that communicates the region I and the region II for guiding the cooling liquid from the region I to the region II or guiding the cooling liquid from the region II to the region I; the pressurizing device is connected with the internal pipeline and is used for pressurizing the cooling liquid in the internal pipeline; The pressure difference reversing mechanism is used for switching the pressurizing direction of the cooling liquid of the internal pipeline to be positive or reverse according to the pressure difference between the area II and the area III, and switching the pressurizing direction of the cooling liquid of the internal pipeline to be positive when the pressure of the cooling liquid of the area II is larger than the pressure of the area III so as to pressurize the cooling liquid of the area I; the pressurizing device comprises an impeller A connected to a motor spindle through a shaft sleeve A; The differential pressure reversing mechanism comprises: The impeller B is fixedly arranged on the communicating pipeline of the area III and the area II and can rotate forward or backward along with the cooling liquid flowing in the communicating pipeline of the area III and the area II; the worm wheel is connected to the bottom of the impeller in a linkage way and is used for rotating along with the rotation of the impeller; the left end of the worm is fixedly connected with the piston A, and the right end of the worm is fixedly connected with the piston B; The piston A is used for blocking the through hole A of the rear end cover of the impeller A along with the movement of the worm, simultaneously opening the through hole B of the rear end cover of the impeller A or blocking the through hole B of the rear end cover of the impeller A, and simultaneously opening the through hole A of the rear end cover of the impeller A; and the piston B is used for blocking the through hole C of the rear end cover of the impeller A along with the movement of the worm and simultaneously opening the through hole D of the rear end cover of the impeller A or blocking the through hole D of the rear end cover of the impeller A and simultaneously opening the through hole C of the rear end cover of the impeller A.
2. The structure for reversing and pressurizing the cooling fluid inside the motor according to claim 1, wherein, The reversing supercharging structure further comprises an impeller A front end cover and an impeller A rear end cover which are arranged in the motor; The inner pipeline comprises an impeller A rear end cover through hole A, an impeller A rear end cover through hole B, an impeller A rear end cover through hole C, an impeller A rear end cover through hole D, an impeller A rear end cover through hole E, an impeller A rear end cover through hole F, an impeller A rear end cover through hole G and an impeller A front end cover through hole A arranged in the impeller A front end cover, and an impeller A front end cover through hole B; impeller A rear end cover through hole one end of A is communicated with the area I, the other end is communicated with an outlet area of the impeller A; The other end is communicated with front of impeller A the other end is communicated with the front of the impeller A one end of the end cover through hole A, the through hole B of the rear end cover of the impeller A is not communicated with the outlet part of the impeller A; impeller A rear end cap through hole C one end of the connecting pipe is communicated with the area II, the other end is communicated with an outlet area of the impeller A; Impeller A rear end cap through hole D one end of the connecting pipe is communicated with the area II, the other end is communicated with the front of the impeller A one end of the end cover through hole B; One end of a through hole B of the front end cover of the impeller A is communicated one end of a through hole D of a rear end cover of the impeller A, the other end is communicated with the inlet of the impeller A; impeller A front end cover through hole A is communicated with one section one end of a through hole B of a rear end cover of the impeller A, the other end is communicated with the inlet of the impeller A.
3. The reversing and pressurizing structure for an internal cooling fluid of a motor according to claim 1, wherein said differential pressure reversing mechanism further comprises: the impeller A rear end cover through hole E is arranged in the impeller A rear end cover and is respectively connected with the impeller A rear end cover through hole A, the impeller A rear end cover through hole B, the impeller A rear end cover through hole C and the impeller A rear end cover through hole D; The right section of the through hole E of the rear end cover of the impeller A is closed by the rear end cover of the impeller A, and a spring B, a piston B, a worm, a piston A, the spring A and a gland are sequentially arranged in the through hole E; one end of the spring B is connected with the right section of the piston B, one end of the impeller is connected with the inner wall of the rear end cover of the impeller A; one end of the spring A is connected with the left section of the piston A, one end is connected with the gland.
4. The reversing and pressurizing structure of the cooling liquid in the motor according to claim 3, wherein the cross section of the piston A is in a transverse arrangement 'king' shape and comprises a left piston section, a middle piston section and a right piston section, wherein the lengths of the middle piston section and the right piston section are consistent with the aperture of a through hole A of a rear end cover of the impeller A and the aperture of a through hole B of the rear end cover of the impeller A, the tail ends of the left piston section and the right piston section are respectively provided with a baffle head with the consistent aperture of the through hole E of the rear end cover of the impeller A, the center diameter is smaller than the diameter of the through hole E of the rear end cover of the impeller A, the diameter of the middle piston section of the piston A is consistent with the aperture of the through hole E of the rear end cover of the impeller A and is larger than the diameters of the left piston section and the right piston section of the piston section, and the through hole A can be blocked when the middle section of the piston A is positioned in the through hole A or the through hole B of the rear end cover of the impeller A; The section of the piston B is in a transverse H shape, and comprises a left piston section, a middle piston section and a right piston section, wherein the left piston section and the right piston section are respectively in consistent length with the through hole C of the rear end cover of the impeller A, the through hole D of the rear end cover of the impeller A, and the diameters of the left piston section and the right piston section are consistent with the through hole G of the rear end cover of the impeller A and larger than the diameter of the middle piston section; When the flow direction of the cooling liquid of the communicating pipeline of the area III and the area II is positive, the impeller B rotates positively to drive the worm wheel to rotate positively, the worm wheel and the worm are in worm wheel and worm drive, the worm drives the piston A and the piston B to move leftwards, and finally the worm wheel and the worm wheel are positioned at the leftmost position under the action of spring force at two ends, at the moment, the middle section of the piston A is positioned in the through hole A of the rear end cover of the impeller A to block the through hole A of the rear end cover of the impeller A, the right section of the piston A is positioned in the through hole B of the rear end cover of the impeller A to open the through hole B of the rear end cover of the impeller A; When the flow direction of the cooling liquid of the communicating pipeline of the area III and the area II is reverse, the impeller B reversely rotates to drive the worm wheel to reversely rotate, the worm wheel and the worm are in worm wheel and worm transmission, the worm drives the piston A and the piston B to move rightwards, and finally the piston A and the piston B are positioned at the rightmost position under the action of spring forces at two ends, at the moment, the middle section of the piston A is positioned in the through hole B of the rear end cover of the impeller A to block the through hole B of the rear end cover of the impeller A, the left section of the piston A is positioned in the through hole A of the rear end cover of the impeller A to open the through hole A of the rear end cover of the impeller A, the middle section of the piston B is positioned in the through hole D of the rear end cover of the impeller A to open the through hole D of the rear end cover of the impeller A, and the left section of the piston B is positioned in the through hole C of the rear end cover of the impeller A to block the rear end cover of the impeller A.
5. The reversing and pressurizing structure of the cooling liquid in the motor according to claim 4, wherein the impeller B is connected with a rear cover of the impeller B through an auxiliary shaft, a shaft sleeve B and a movable ring C and a stationary ring C which are matched with each other; the rear cover of the impeller B is provided with a central hole; the auxiliary shaft is arranged in a central hole of a rear cover of the impeller B through a shaft sleeve B; the impeller B is sleeved on the auxiliary shaft and is arranged in a central hole of a rear cover of the impeller B; the movable ring C is fixedly connected to one end of the shaft sleeve B, the static ring C is arranged on the inner side of a central hole of a rear cover of the impeller B, and the static ring C passes through the auxiliary shaft and the movable ring C from bottom to top so as to finish positioning, assembling and positioning installation.
6. The reversing and pressurizing structure for the cooling fluid in the motor according to claim 5, wherein the worm wheel is installed at the lower end of the auxiliary shaft and is fixedly connected with the auxiliary shaft.
7. The reversing and pressurizing structure for the motor internal coolant according to claim 1, wherein the differential pressure reversing mechanism further includes an impeller B front cover and an impeller B rear cover provided beside the impeller B; the rear end cover of the impeller A is assembled and connected with the inner wall of the motor through a movable ring A and a static ring A, and the movable ring A is in sealing fit with the static ring A; the front end cover of the impeller A is fixedly connected with the stationary ring B, the front end cover of the impeller A is assembled and connected with the right end of the rear end cover of the impeller A, and the movable ring B is in sealing fit with the stationary ring B.
8. The reversing and pressurizing structure of the cooling liquid in the motor according to claim 1, wherein the impeller A rear end cover is internally provided with an impeller A rear end cover through hole F and an impeller A rear end cover through hole G; The front cover of the impeller B is provided with a through hole A; Impeller A rear end cover through hole one end of F is communicated with the hose, the other end is communicated with a front cover through hole A of the impeller B; Impeller A rear end cap through hole G one end a through hole A of a front cover of the impeller B is communicated, the other end communicates with region II.
9. An electric machine comprising a reversing and pressurizing structure of the cooling fluid inside the electric machine according to any one of claims 1 to 8.

Description

Reversing and pressurizing structure of cooling liquid in motor and motor Technical Field The invention belongs to the field of power engineering and engineering thermophysics, and particularly relates to a reversing and pressurizing structure of cooling liquid in a motor and the motor. Background The variable-frequency wet motor often adopts an independent internal cooling circulation loop to cool the motor, and the cooling circulation loop can automatically switch and select a forward circulation loop and a reverse circulation loop according to the change of the rotating speed of the motor. However, due to the light weight and miniaturization of the overall structure of the motor, the unit adopts the thrust disc to open holes as auxiliary impellers to provide the internal lift of the cooling liquid of the motor cavity. The internal path loss and the local loss of the motor cavity are large, particularly, the power of the circulating cooling liquid is insufficient due to the switching of the cooling circulation loop direction, the internal circulation cannot be completed, the heat dissipation of the motor is affected, and the normal operation of the unit is affected. However, if the pressurizing devices are respectively arranged for the forward circulation loop and the reverse circulation loop, on one hand, structural redundancy is caused, and the manufacturing cost is increased, and on the other hand, the pressurizing devices are additionally arranged to be independently operated, so that the operation flow is complex, and the operation difficulty is increased. Disclosure of Invention The invention aims to overcome the defects in the prior art and provides a reversing and pressurizing structure of cooling liquid in a motor and the motor, which can be used for pressurizing the cooling liquid in the motor under the condition of reversing an internal cooling circulation loop. In order to achieve the above purpose, the invention is realized by adopting the following technical scheme: the invention provides a reversing and pressurizing structure of cooling liquid in a motor, which is arranged in an inner cavity of the motor, wherein a region I, a region II and a region III are arranged in the inner cavity of the motor according to the forward circulation sequence of the cooling liquid; The reversing supercharging structure comprises: An internal pipe that communicates the region I and the region II for guiding the cooling liquid from the region I to the region II or guiding the cooling liquid from the region II to the region I; the pressurizing device is connected with the internal pipeline and is used for pressurizing the cooling liquid in the internal pipeline; the pressure difference reversing mechanism is used for switching the pressurizing direction of the cooling liquid of the internal pipeline to be positive or reverse according to the pressure difference between the area II and the area III, switching the pressurizing direction of the cooling liquid of the internal pipeline to be positive when the pressure of the cooling liquid of the area II is larger than that of the area III so as to pressurize the cooling liquid of the area I, and switching the pressurizing direction of the cooling liquid of the internal pipeline to be reverse when the pressure of the cooling liquid of the area II is smaller than that of the area III so as to pressurize the cooling liquid of the area II to the area I. The arrangement achieves the effects that in the forward circulation, the flow path is a circulating power source (thrust disk), an air gap of a motor, a region I, a region II, a region III, a cooling water pipe and a circulating power source (thrust disk). In the reverse circulation, the flow path is a circulating power source (thrust disc), a cooling water pipe, a region III, a region II, a region I, a motor air gap and a circulating power source (thrust disc). The pressure difference between the detection area II and the detection area III confirms that the circulation is forward or reverse, so that the pressurization direction is determined, the pressure increase of the cooling liquid in the motor cavity can be realized according to the direction change of the internal circulation of the motor, the internal resistance of the motor cavity is overcome, the smooth completion of the circulation is ensured, and meanwhile, the operation is simple, the cost is reduced and the efficiency is improved. Further set up: the pressurizing device comprises an impeller A connected to a motor spindle through a shaft sleeve A; The reversing supercharging structure further comprises an impeller A front end cover and an impeller A rear end cover which are arranged in the motor; The inner pipeline comprises an impeller A rear end cover through hole A, an impeller A rear end cover through hole B, an impeller A rear end cover through hole C, an impeller A rear end cover through hole D, an impeller A rear end cover through hole E, an imp