Liquid pump device

Patent metadata

Field	Value
Publication number	US-2023075042-A1
Application number	US-202217890226-A
Country	US
Kind code	A1
Filing date	Aug 17, 2022
Priority date	Aug 28, 2021
Publication date	Mar 9, 2023
Grant date	—

Abstract

A liquid pump device sucking and discharging liquid includes: a pump unit 50 , rotating to make the liquid flow; a housing H, accommodating the pump unit and defining a passage 14 of the liquid; and a temperature sensor 80 having a tip region 80 a protruded in the passage 14 of the liquid to measure a temperature of the liquid flowing on the passage 14.

First claim

What is claimed is:

1 . A liquid pump device, comprising:
a pump unit, rotating to make liquid flow; a housing, accommodating the pump unit and defining a passage of the liquid; and a temperature sensor having a tip region protruded in the passage, so as to measure a temperature of the liquid flowing on the passage.

2 . The liquid pump device as claimed in claim 1 , wherein the temperature sensor comprises: a cylindrical member that is bottomed and inserted into the passage; and a sensor element disposed at a tip region inside of the cylindrical member, and the temperature sensor is disposed in a manner that the liquid flowing on the passage collides with the tip region of the cylindrical member.

3 . The liquid pump device as claimed in claim 2 , wherein the passage comprises a first linear passage and a second linear passage intersecting and communicating with the first linear passage, and
the temperature sensor is disposed in a manner that the tip region of the cylindrical member faces an intersection region between the first linear passage and the second linear passage.

4 . The liquid pump device as claimed in claim 3 , wherein the cylindrical member comprises: a large diameter part, fit with an inner wall surface of the first linear passage; and a small diameter part, formed in a bottomed shape on a tip side with respect to the large diameter part, arranged with a gap with the inner wall surface of the first linear passage, and accommodating the sensor element, and
the small diameter part is disposed to face the intersection region between the first linear passage and the second linear passage.

5 . The liquid pump device as claimed in claim 4 , wherein the cylindrical member comprises a surrounding wall part formed by a resin material and formed to be curved so that a region opposite to the second linear passage is cut off to partially surround a periphery of the small diameter part.

6 . The liquid pump device as claimed in claim 5 , wherein the surrounding wall part has an outer wall surface opposite to the inner wall surface of the first linear passage.

7 . The liquid pump device as claimed in claim 6 , wherein the surrounding wall part has a plurality of projection parts projecting from the outer wall surface to abut against the inner wall surface of the first linear passage, so as to define a gap between the inner wall surface of the first linear passage and the outer wall surface.

8 . The liquid pump device as claimed in claim 1 , comprising:
a motor, having a driving shaft rotating around a predetermined axis to rotation-drive the pump unit; and a circuit substrate, to which a control unit controlling driving of the motor is mounted.

9 . The liquid pump device as claimed in claim 8 , wherein the temperature sensor is connected to the circuit substrate.

10 . The liquid pump device as claimed in claim 8 , wherein the housing comprises:
a housing body, defining a joining surface joined to an applicable target, a pump accommodation concave part accommodating the pump unit, a motor accommodation concave part accommodating the motor, and the passage; and a pump cover, joined to the housing body so as to cover the pump accommodation concave part, and defining an opening part through which the liquid passes.

11 . The liquid pump device as claimed in claim 10 , wherein the housing comprises: a through passage extending in parallel with the axis and penetrating through the housing body to be open to the joining surface, so as to define a portion of the passage; and a communication passage, inclined with respect to the axis to extend and allowing the pump accommodation concave part to communicate with the through passage, and
the temperature sensor is disposed in a manner that the tip region of the temperature sensor faces an intersection region between the through passage and the communication passage.

12 . The liquid pump device as claimed in claim 11 , wherein the housing comprises a motor cover joined to the housing body, so as to cover the motor accommodation concave part.

13 . The liquid pump device as claimed in claim 12 , wherein the temperature sensor comprises: a cylindrical member that is bottomed and provided at the motor cover to be inserted into the through passage; and a sensor element, electrically connected to the circuit substrate to be disposed at a tip region inside of the cylindrical member.

14 . The liquid pump device as claimed in claim 13 , wherein the cylindrical member comprises: a large diameter part, fit with an inner wall surface of the through passage; and a small diameter part, formed in a bottomed shape on a tip side with respect to the large diameter part, arranged with a gap with the inner wall surface of the through passage, and accommodating the sensor element, and
the small diameter part is disposed at the intersection region between the through passage and the communication passage.

15 . The liquid pump device as claimed in claim 14 , wherein the cylindrical member comprises a surrounding wall part formed by a resin material and formed to be curved so that a region opposite to the communication passage is cut off to partially surround a periphery of the small diameter part.

16 . The liquid pump device as claimed in claim 15 , wherein the surrounding wall part has an outer wall surface opposite to the inner wall surface of the through passage.

17 . The liquid pump device as claimed in claim 16 , wherein the surrounding wall part has a plurality of projection parts projecting from the outer wall surface to abut against the inner wall surface of the through passage, so as to define a gap between the inner wall surface of the through passage and the outer wall surface.

18 . The liquid pump device as claimed in claim 12 , wherein the housing comprises an outer cover joined to the motor cover to cover the circuit substrate disposed on an outer side of the motor cover,

19 . The liquid pump device as claimed in claim 1 , wherein the passage on which the temperature sensor is disposed is a discharge passage which discharges liquid pressurized by the pump unit.

20 . The liquid pump device as claimed in claim 19 , wherein the liquid pump device comprises a filter member disposed upstream of an inlet port sucking the liquid to the pump unit.

21 . The liquid pump device as claimed in claim 20 , wherein the pump unit is a trochoid-type pump unit comprising an inner rotor and an outer rotor.

Assignees

• Mikuni Kogyo Kk

Inventors

• Mikami Yuichi
• Ogi Takeshi
• Takahashi Jun

Classifications

• F04C2270/19

  Temperature · CPC title

• F04C2240/81

  Sensor, e.g. electronic sensor for control or monitoring · CPC title

• F04C2240/30

  Casings or housings · CPC title

• F04C2/102 Primary

  the two members rotating simultaneously around their respective axes · CPC title

• F04C2240/40

  Electric motor · CPC title