WATER PUMP
FIG3 is a cross-sectional view illustrating a state in which a discharge port of a water pump according to an embodiment of the present disclosure is opened
Referring to FIG3, the motor control unit that received a signal from the temperature sensor controls the linear motor 1300 to move the piston 1310 in a direction away from the body portion 1100. In this case, a space of the hydraulic space 1200a is increased and some of the cooling water inside the pressurizing space 1142a is introduced towards the hydraulic space 1200a, and accordingly, the pressure applied to the impeller cover 1141 by the cooling water inside the pressurizing space 1142a is reduced.
cross-sectional view
1100
body portion
1130
rotation shaft
1141
impeller cover
1430
stator
1150
check valve
1440
motor casing
1000
water pump
1420
rotor
1110
housing
1500
lock preventing member
1200
cylinder portion
['1. A water pump comprising: a body portion comprising a housing where an inlet port and a discharge port through which cooling water is introduced and discharged are provided, an impeller accommodated inside the housing and introducing or discharging the cooling water via rotation, a rotation shaft coupled to the impeller and rotating the impeller by receiving external driving power, and a cooling water flow rate control unit arranged above the impeller and operating to selectively open or close the discharge port; a cylinder portion provided above the cooling water flow rate control unit and formed therein a hydraulic space accommodating cooling water that applies pressure to the cooling water flow rate control unit; a piston located inside the hydraulic space and pressurizing the cooling water present inside the hydraulic space; a driving unit coupled to a side surface of the cylinder portion and moving the piston forward or backward; and a lock preventing member located at an inner surface of the cylinder portion that faces a front surface or a rear surface of the piston, and formed of an elastic material.', '2. The water pump of claim 1, wherein the driving unit comprises: a linear shaft coupled to the piston and moving the piston inside the hydraulic space; a rotor coupled to a thread formed on an outer surface of the linear shaft and moving the linear shaft forward and backward via rotation; a stator arranged to surround the rotor and rotating the rotor; and a motor casing accommodating the linear shaft, the rotor, and the stator therein.', '5. The water pump of any one of claims 1 to 4, wherein the cooling water flow rate control unit comprises: an impeller cover arranged above the impeller, formed in a cylinder shape of which an end portion facing the impeller is opened, and operating such that a side surface selectively opens or closes the discharge port; a chamber cover arranged above the impeller cover, having a pressurizing space communicating with the hydraulic space therein, and applying pressure to the impeller cover through the cooling water introduced to the pressurizing space; and a pressurizing member arranged in a pressurizing space between the impeller cover and the chamber cover to seal a gap between the impeller cover and the chamber cover, and transmitting the pressure applied by the cooling water introduced to the pressurizing space to the impeller cover.', '7. The water pump of claim 5, wherein the body portion further comprises a check valve accommodated inside the housing to face a cooling water flow hole of which one end is connected to the cylinder portion and the other end is provided at the impeller cover, and preventing the cooling water from being introduced from the cylinder portion to the body portion by being closed when the piston moves in a direction towards the body portion.']