Urea solution pump unit

Patent metadata

Field	Value
Publication number	US-2016265406-A1
Application number	US-201514857427-A
Country	US
Kind code	A1
Filing date	Sep 17, 2015
Priority date	Mar 9, 2015
Publication date	Sep 15, 2016
Grant date	—

Abstract

A urea solution pump unit includes a bracket mounted to a lower side of a urea solution tank. A pump unit is horizontally disposed at a center of an upper part of the bracket and includes a pump suctioning a urea solution to one direction and a motor pumping the urea solution to another direction through a gap between a rotor and a stator of the motor inside the pump and discharging the urea solution to a lower side of the bracket. A pair of thawing units are fixedly disposed at both sides of the pump unit on the bracket. The thawing units transfer heat to the urea solution and prevent the urea solution from being frozen. A sensor unit is disposed at one side of one of the thawing units and detects a level, a temperature, and a pressure of the urea solution.

First claim

What is claimed is:

1 . A urea solution pump unit, comprising:
a bracket mounted to a lower side of a urea solution tank; a pump unit horizontally disposed at a center of an upper part of the bracket and including a pump suctioning a urea solution to one direction and a motor pumping the urea solution to another direction through a gap between a rotor and a stator of the motor inside the pump and discharging the urea solution to a lower side of the bracket; a pair of thawing units fixedly disposed at both sides of the pump unit on the bracket, the pair of thawing units transferring heat to the urea solution and preventing the urea solution from being frozen; and a sensor unit disposed at one side of one of the thawing units and detecting a level, a temperature, and a pressure of the urea solution.

2 . The urea solution pump unit of claim 1 , wherein the stator includes:
an exterior stator over-molding surrounding an outer peripheral surface of the stator; and an interior stator over-molding surrounding an inner peripheral surface of the stator.

3 . The urea solution pump unit of claim 2 , wherein the rotor includes:
a rotor over-molding surrounding an outer side of the rotor.

4 . The urea solution pump unit of claim 1 , wherein
the motor includes a rotating shaft rotating together with the rotor so that the urea solution is sucked through one end of the rotating shaft and discharged to another end of the rotating shaft, and the pump unit includes: an upper cover disposed at the other end of the rotating shaft, having an outlet at a center thereof corresponding to the rotating shaft, and having a three-phase terminal which supplies power to the stator and is disposed at an external side of the outlet; an outlet adaptor integrally extending from the upper cover toward an opposite side of the rotor and fastened to an upper surface of the bracket to transfer the urea solution to the lower side of the bracket; and a relief valve fastened to the outlet adaptor and maintaining the urea solution at a predetermined pressure or lower.

5 . The urea solution pump unit of claim 4 , wherein
when the relief valve is connected with the outlet and a pressure equal to or larger than the predetermined value is detected, the relief valve autonomously opens and relieves the pressure to an upper side of the bracket.

6 . The urea solution pump unit of claim 4 , wherein
the three-phase terminal extends to a lower part of the outlet adaptor and communicates with outside through the bracket.

7 . The urea solution pump unit of claim 6 , further comprising:
a first adaptor o-ring disposed around the three-phase terminal, which extends to lower sides of the outlet and the outlet adaptor, to seal the outlet and the outlet adaptor from the urea solution in which the outlet extends at a lower side of the outlet adaptor.

8 . The urea solution pump unit of claim 4 , wherein
a pipe-shaped metal port is inserted into an internal peripheral surface of the outlet corresponding to the outlet adaptor, and one or more port o-rings, which are sealing members, are disposed on an outer peripheral surface of the pipe-shaped metal port.

9 . The urea solution pump unit of claim 4 , wherein
a discharge pipe discharges the urea solution received from the outlet adaptor and integrally extends at the lower side of the bracket, a pipe-shaped metal port is inserted in an internal peripheral surface of the outlet, and one or more port o-rings, which are sealing members, are disposed on an outer peripheral surface of the pipe-shaped metal port.

10 . The urea solution pump unit of claim 4 , wherein
an adaptor insertion recess, into which the outlet adaptor is inserted, is formed on the bracket, and the urea solution pump unit includes a clip that fixes the outlet adaptor to the adaptor insertion recess in a state where the outlet adaptor is inserted into the adaptor insertion recess.

11 . The urea solution pump unit of claim 10 , further comprising:
a second adaptor o-ring disposed between a lower surface of the outlet adaptor and a bottom surface of the adaptor insertion recess to seal a urea solution.

12 . The urea solution pump unit of claim 1 , wherein the bracket includes:
hooks integrally formed on the bracket; and hook fastening parts fastened to the hooks and integrally formed at a lower side of each thawing unit.

13 . The urea solution pump unit of claim 1 , wherein the sensor unit includes:
a sensor flange extending to an upper side of the bracket; and a sensor cell mounted on the bracket at a lower end of the sensor flange, wherein the sensor cell is surrounded by a resin material to be sealed from the urea solution, is fixed to the bracket, and is electrically connected to a lower external side of the bracket.

14 . The urea solution pump unit of claim 1 , wherein each of the pair of thawing units includes:
a positive temperature coefficient (PTC) thermistor configured to generate heat by electrical energy; a PTC guide having a recess into which the PTC thermistor is mounted; a pair of power supply terminals attached to both surfaces of the PTC guide and in contact with the PTC; an adhesive film attached to external surfaces of the pair of power supply terminals; and a thawing over-molding surrounding external sides of the PTC, the PTC guide, and the adhesive film to protect the PTC, the PTC guide, and the adhesive film from the urea solution.

15 . The urea solution pump unit of claim 4 , wherein
the relief valve includes a check ball and an elastic member elastically supporting the check ball.

16 . The urea solution pump unit of claim 1 , further comprising:
a heater connector connecting a power supply to the thawing unit; a pressure sensor connector connecting the power supply to the sensor unit; a motor connector connecting the power supply to the motor; a level/temperature sensor connector connecting the power supply to the sensor unit; and a collective connector mounted at the lower side of the bracket and connected to each of the heater connector, the pressure sensor connector, the motor connector, and the level/temperature sensor connector at one side of the collective connector.

17 . The urea solution pump unit of claim 1 , wherein the sensor unit includes a temperature sensor, a pressure sensor, or a level sensor.

Assignees

• Hyundai Motor Co Ltd
• Hyundam Ind Co Ltd

Inventors

• Ryu Bu Yeol
• Choi Pil Seon
• Jeon Chan Yo
• Cho Bu Hyeon
• Hwang Yong Taek

Classifications

• F01N3/2066 Primary

  Selective catalytic reduction [SCR] · CPC title

• F01N2610/1433

  Pumps · CPC title

• F01N2610/02

  the substance being ammonia or urea · CPC title

• F04D13/06

  the pump being electrically driven · CPC title

• F01N2610/148

  Arrangement of sensors · CPC title