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KR-102737182-B9 - Water pump

KR102737182B9KR 102737182 B9KR102737182 B9KR 102737182B9KR-102737182-B9

Abstract

The water pump of the present invention relates to a water pump capable of reducing abnormal noise and vibration in the bearing portion by forming a fluid passage so that fluid introduced through the inlet side passes through the bearing portion, and forming a fluid passage in the rotor receiving portion and the inner side of the rotor so that fluid can circulate, thereby facilitating the lubrication of the bearing to which the rotor is rotatably coupled and reducing the pressure difference between the upper and lower sides of the rotor and impeller assembly.

Inventors

  • 이현태
  • 김형민
  • 이우근
  • 모동헌
  • 김해수
  • 이상민
  • 이건식

Assignees

  • 주식회사 코아비스

Dates

Publication Date
20260511
Application Date
20220810

Claims (10)

  1. A lower casing having a rotor receiving portion formed protruding downwardly, in which a rotor receiving space is formed concavely from the upper surface downward, a lower bearing mounting portion formed at the lower inner end of the rotor receiving portion, and a lower bearing coupled inside the lower bearing mounting portion; An upper casing coupled to the upper side of the lower casing, wherein an impeller receiving space is formed inside by coupling with the lower casing, and an inlet portion for fluid inflow and an outlet portion for fluid discharge are formed in communication with the impeller receiving space, wherein an upper bearing mounting portion is extended from the inlet portion, and an upper bearing is coupled inside the upper bearing mounting portion; An impeller rotatably provided in the above impeller receiving space; and A rotor provided in the rotor receiving space of the lower casing and coupled to the impeller, with both ends of the rotation axis rotatably coupled to the lower bearing and the upper bearing; comprising In the upper bearing mounting portion, a cooling hole is formed that penetrates the interior and exterior of the upper bearing mounting portion vertically. The upper casing above is, It further includes a plurality of supports, the upper end of which is connected to the lower inner wall of the inlet portion and the lower end of which is connected to the upper bearing mounting portion. The upper bearing mounting portion is formed to extend from the bottom of the inlet portion toward the impeller receiving space, and The upper bearing mounting portion is partially or entirely positioned inside the inlet side of the impeller, and An insertion groove is formed concavely downward at the lower inlet side of the impeller and at the upper end of the rotor, and the upper bearing mounting portion is inserted into the insertion groove and spaced apart. A water pump characterized by having a connecting passage formed in the rotor that penetrates from top to bottom and connects the lower side of the rotor with the insertion groove.
  2. In paragraph 1, A water pump characterized in that a communication channel penetrating the upper and lower parts of the rotor is formed, and the inlet side of the impeller coupled to the upper part of the rotor and the lower side of the rotor are connected to each other by the communication channel.
  3. In paragraph 1, A water pump characterized by having a concave communication groove formed on the inner surface along the vertical direction in the rotor receiving portion of the lower casing.
  4. In paragraph 1, A water pump characterized in that the rotor receiving portion has a lower cooling channel formed therein that communicates with the interior of the lower bearing mounting portion from the outer lower end of the lower bearing mounting portion.
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  9. In paragraph 1, A motor housing formed in the shape of a concave container with an open top; and A water pump comprising a stator provided inside the motor housing.
  10. In Paragraph 9, A protruding rib is formed along the vertical direction on the outer surface of the rotor receiving portion of the lower casing, and the protruding rib is inserted and arranged between adjacent teeth of the stator. A water pump characterized by having a concave connecting groove formed on the inner surface along the vertical direction at a position corresponding to the above-mentioned protruding rib.

Description

Water pump The present invention relates to a water pump that pumps cooling water by rotating an impeller. A water pump is a device used to circulate coolant to an engine or heater for purposes such as engine cooling or interior heating. These water pumps are broadly classified into mechanical water pumps and electric water pumps. A mechanical water pump is a pump connected to the engine's crankshaft and driven by the rotation of the crankshaft, while an electric water pump is a pump driven by the rotation of a motor controlled by a control unit. An electric water pump is largely formed by a housing, stator, and rotor constituting the motor section, and an impeller and impeller casing constituting the pump section. The stator is provided inside the housing and fixed to it, and the rotor is positioned spaced apart from the inside of the stator. The impeller is coupled to the rotor's rotation axis, and the impeller casing is coupled to the housing to cover the impeller. FIG. 1 is a front cross-sectional view showing an example of a conventional electric water pump. As described above, a conventional electric water pump is largely composed of a motor housing (30), a stator (10), a lower casing (20), an upper casing (60), an impeller (50), and a rotor (40). The motor housing (30) is formed in the shape of a concave container with an open top, and the stator (10) is inserted inside the motor housing (30). The lower casing (20) is coupled to the upper side of the motor housing (30), and the rotor receiving portion (21) of the lower casing (20) is inserted through the hollow interior of the stator (10). The rotor (40) is inserted inside the rotor receiving portion (21), and the impeller (50) is positioned above the rotor (40), and the rotor (40) and the impeller (50) are integrally coupled. Additionally, an upper casing (60) is coupled to the upper side of the lower casing (20), and an impeller (50) is placed in the impeller receiving space, which is an internal space formed by the coupling of the lower casing (20) and the upper casing (60). Furthermore, a lower bearing mounting portion (22) is formed at the bottom of the rotor receiving portion (21) of the lower casing (20), and a lower bearing (42) composed of a bushing (B) and a support pin (P) is coupled to the lower bearing mounting portion (22). Additionally, plate-shaped support portions (65) are formed extending radially inward from the inner wall of the inflow path of the upper casing (60), and an upper bearing mounting portion (64) is coupled to the inner end of the support portions (65), and an upper bearing (43) composed of a bushing (B) and a support pin (P) is coupled to the upper bearing mounting portion (64). Thus, the lower end of the rotation axis (41) of the rotor (400) is rotatably connected to the lower bearing (42), and the upper end of the rotation axis (41) is rotatably connected to the upper bearing (43). In this case, the fluid does not flow well toward the upper bearing (43) and lower bearing (42) in the conventional electric water pump, so the lubrication of the upper bearing (43) and lower bearing (42) is not smooth. And when the impeller rotates and the fluid is pumped, abnormal noise and vibration occur in the upper bearing (43) and lower bearing (42) due to the difference in fluid pressure between the upper and lower parts of the impeller (50) and rotor (40) assembly. FIG. 1 is a front cross-sectional view showing an example of a conventional electric water pump. FIGS. 2 and FIGS. 3 are an assembled perspective view and an exploded perspective view showing a water pump according to an embodiment of the present invention. FIG. 4 is a front cross-sectional view showing a water pump according to an embodiment of the present invention. FIG. 5 is a partial cross-sectional perspective view showing the lower inlet section and the upper bearing mounting section in the upper casing of a water pump according to an embodiment of the present invention. FIG. 6 is a planar cross-sectional view of a water pump according to an embodiment of the present invention. Hereinafter, the water pump of the present invention will be described in detail with reference to the attached drawings. FIGS. 2 and FIGS. 3 are an assembled perspective view and an exploded perspective view showing a water pump according to an embodiment of the present invention, and FIG. 4 is a front cross-sectional view showing a water pump according to an embodiment of the present invention. As described above, a water pump according to one embodiment of the present invention may be largely composed of a lower casing (200), an upper casing (600), an impeller (500), and a rotor (400), and may further include a motor housing (300) and a stator (100). The lower casing (200) has a lower seating groove (211) formed concavely from the upper surface downward so as to accommodate a part of the impeller (500), and a lower flow path groove (212) can be formed concavely on the outer side of the