Search

CN-120798814-B - Shielding pump with dynamic balance leakage-free structure

CN120798814BCN 120798814 BCN120798814 BCN 120798814BCN-120798814-B

Abstract

The invention discloses a shielding pump with a dynamic balance leakage-free structure, wherein a leakage-proof structure is arranged at the fixed position of an outer ring shielding cover and a motor casing front cover, and a dynamic balance structure is arranged at the fixed position of an inner ring shielding cover and an end ring, wherein the leakage-proof structure adopts a multi-stage buffer groove structure, and the dynamic balance structure adopts an elastic sealing balance structure. The anti-leakage structure comprises a front cover sealing sleeve in a 'shape' structure, wherein the front cover sealing sleeve stretches across two sides of a first step surface of the front cover and is fixedly connected with an inner side surface of the front cover through bolts, and the other end of the front cover sealing sleeve is connected with a second step surface of the front cover through a static sealing belt. The two ends of the inner ring shielding cover are provided with radial inner ring shielding cover sealing parts and axial inner ring shielding cover cross sealing parts which are connected in sequence. The structure of the shielding cover is improved, so that leakage is reduced, and balance is greatly improved.

Inventors

  • CHEN BIN
  • HU XIAOLIN
  • ZHOU CHUANWEI

Assignees

  • 浙江威格智能泵业股份有限公司
  • 江苏大学流体机械温岭研究院

Dates

Publication Date
20260508
Application Date
20250909

Claims (6)

  1. 1. A shield pump with a dynamic balance leakage-free structure comprises a pump and a shield motor connected with the pump, wherein the pump comprises a water inlet section (1), a pump body (2), a front guide wheel (3), an impeller (4), a pump rear cover (5) and a pump shaft (6) which are sequentially installed and connected, the shield motor comprises an inner ring rotor set (20) and an outer ring stator set (21), the front end of the shield motor is connected with the pump rear cover (5) through a motor shell front cover (7), the pump and the shield motor are in transmission connection through a front bearing seat (9), a front bearing (11), a front shaft sleeve (14) and a front thrust disc (16), the rear end of the shield motor is in transmission fixed connection through a motor shell rear cover (8), a rear bearing seat (10), a rear bearing (12), a rear shaft sleeve (15) and a rear thrust disc (17), a circulating runner (13) is arranged at the axis of the pump shaft (6), an inner ring shield cover (18) is fixedly installed at the outer side of the inner ring rotor set (20), a shield cover (19) is fixedly installed at the inner side of the outer ring stator set (21), end rings (22) are fixedly installed at the two ends of the rotor set (20), the shield cover (19) is fixedly installed with an end ring (22), the front cover (7) is fixedly provided with a leakage-preventing structure, a dynamic balance structure (24) is arranged at the fixed position of the inner ring shielding cover (18) and the end ring (22); the motor casing front cover (7) comprises a front cover inner side surface (71), a front cover first step surface (72), a front cover second step surface (73) and a front cover third step surface (74) which are sequentially connected, the anti-leakage structure (23) comprises a front cover sealing sleeve (231) which is of a 'shape', the front cover sealing sleeve (231) stretches across the two sides of the front cover first step surface (72) and is fixedly connected with the front cover inner side surface (71) through bolts, the other end of the front cover sealing sleeve is connected with the front cover second step surface (73) through static sealing belts, a first buffer cavity (233) is arranged between the front cover sealing sleeve (231) and the front cover first step surface (72), radial outer ring shielding cover sealing parts (191) and axial outer ring shielding cover step parts (192) which are sequentially connected are arranged at the two ends of the outer ring shielding cover (19), a plurality of trapezoid sealing ring grooves are formed in the radial outer ring shielding cover sealing parts (191), the free ends of the axial outer ring shielding cover sealing parts (192) and the front cover third step surfaces (74) are fixedly connected with the Y-shaped sealing sleeve (232) through the Y-shaped sealing sleeve (23), the Y-shaped sealing ring comprises a Y-shaped sealing ring (232), a second buffer cavity (234) is arranged between the outer ring shielding cover (19) and a front cover sealing sleeve (231), an adjusting screw (235) is arranged between the outer ring shielding cover (19) and the front cover sealing sleeve (231), and the adjusting screw (235) is used for adjusting the tight matching degree between the Y-shaped sealing ring (232) and the sealing ring groove.
  2. 2. The canned motor pump with dynamic balance and no leakage structure according to claim 1, wherein the end of the end ring (22) connected with the inner ring canned motor (18) is provided with a first end ring convex part (241), a first end ring step part (242), a first end ring groove part (243), a second end ring step part (244) and a second end ring convex part (245) which are connected in sequence, the two ends of the inner ring canned motor (18) are provided with a radial inner ring canned motor sealing part (181) and an axial inner ring canned motor cross sealing part (182) which are connected in sequence, and a multidimensional compensating ring (184) is arranged between the radial inner ring canned motor sealing part (181) and the first end ring convex part (241).
  3. 3. The canned motor pump with dynamic balance leak-free structure as set forth in claim 2, wherein the axially outer free end of the axially inner ring canned motor cross seal (182) is connected to the first end ring groove (243) with a dynamic seal band.
  4. 4. A canned motor pump with a dynamic balance leak-free structure as claimed in claim 3, characterized in that the two radially outer free ends of the cross seal (182) of the axially inner ring canned motor are connected with the first end ring step (242) and the second end ring step (244) respectively by means of dynamic sealing strips.
  5. 5. The canned motor pump with dynamic balance leak-free structure as set forth in claim 4, characterized in that a first buffer spring (246), a second buffer spring (247) are provided between the axial inner ring canned motor cross seal (182) and the first end ring boss (241), the second end ring boss (245).
  6. 6. The shield pump with a dynamic balance leak-free structure of claim 5, wherein a third buffer chamber (248) is present between the end ring (22) and the inner ring shield (18), the first buffer spring (246) being disposed in the third buffer chamber (248), wherein the stiffness coefficient K1 of the first buffer spring (246) is greater than the stiffness coefficient K2 of the second buffer spring (247).

Description

Shielding pump with dynamic balance leakage-free structure Technical Field The invention relates to the technical field of fluid machinery, in particular to a canned motor pump with a dynamic balance leakage-free structure. Background The shielding pump seals the motor and the pump in a completely closed shell, separates the stator winding and the rotor from the conveying medium through a shielding cover, and cracks, perforations and the like of the shielding cover can lead to the intercommunication or leakage of the internal medium and the motor cavity to the outside, thereby leading to the short circuit of the motor winding, the burning of the motor, the blockage of the bearing, the locking of the rotor and the like. Once a failed shut down occurs, it can result in a stagnation of the entire production plant, with a loss of line downtime far greater than the maintenance costs of the pump itself. The balance of the canned motor pump is the guarantee that the canned motor pump can run stably and quietly for a long time. Balancing refers primarily to dynamic balancing of rotor components, as well as to hydraulic balancing and axial force balancing, any imbalance leading to serious consequences. Once the rotor is obviously unbalanced, the rotor does not rotate at a uniform speed around the central line, but eccentric force is generated, so that the rotor vibrates and radially jumps, and the direct consequences of the eccentric force are abrasion of a shielding cover, abrasion of a bearing, increase of vibration and noise, increase of energy consumption and performance reduction. However, the prior art canned motor pump has design limitation, only relates to the design of a part of non-universal structure, does not change related structure essentially, has weak adaptability, poor stability, high surge, high noise and low efficiency, and therefore, the inventor proposes a canned motor pump with dynamic balance and no leakage structure to solve the above mentioned problems to reduce leakage and improve balance. Disclosure of Invention The invention aims to solve the defects in the prior art, and provides a shielding pump with a dynamic balance leakage-free structure. In order to achieve the above purpose, the present invention adopts the following technical scheme: the utility model provides a canned motor pump with dynamic balance does not have leakage structure, the canned motor pump includes the pump and is connected with the pump, the pump includes the inlet segment that installs in proper order and connects, the pump body, the front guide pulley, the impeller, pump back shroud, the pump shaft, canned motor includes inner circle rotor group and outer lane stator group, canned motor front end is connected with pump back shroud through motor casing protecgulum, pass through the front bearing frame between pump and the canned motor, front bearing, preceding axle sleeve, preceding thrust disk transmission fixed connection between canned motor rear end through motor casing back shroud, the back bearing frame, the rear bearing, back axle sleeve, back thrust disk transmission fixed connection, the pump shaft axle center is provided with the circulation runner, inner circle rotor group outside fixed mounting has the inner circle shield cover, outer lane stator group inboard fixed mounting has the outer lane shield cover, the both ends fixed mounting of inner circle rotor group has the end ring, characterized in that outer lane shield cover and motor casing protecgulum fixed part is provided with leak-proof structure, inner circle shield cover and end ring fixed part are provided with dynamic balance structure, wherein leak-proof structure adopts multistage buffer tank structure, dynamic balance structure adopts elasticity seal balance structure. The motor casing front cover comprises a front cover inner side surface, a front cover first step surface, a front cover second step surface and a front cover third step surface which are sequentially connected, the anti-leakage structure comprises a front cover sealing sleeve in a 'structure', the front cover sealing sleeve stretches across the two sides of the front cover first step surface and is fixed, one end of the front cover sealing sleeve is fixedly connected with the front cover inner side surface through bolts, and the other end of the front cover sealing sleeve is connected with the front cover second step surface through a static sealing belt. Further, a first buffer cavity is arranged between the front cover sealing sleeve and the first step surface of the front cover. The radial outer ring shielding cover sealing part is provided with a plurality of sealing ring grooves with trapezoid cross sections, and the free end of the axial outer ring shielding cover step part is connected with a third step surface of the front cover by adopting a static sealing belt. Further, the anti-leakage structure further comprises a Y-shaped sealing ring, the Y-shaped sealing ring