WO2015045569A1

WO2015045569A1 - Water pump

Info

Publication number: WO2015045569A1
Application number: PCT/JP2014/068661
Authority: WO
Inventors: 健彌寶井
Original assignee: 日立オートモティブシステムズ株式会社
Priority date: 2013-09-24
Filing date: 2014-07-14
Publication date: 2015-04-02
Also published as: DE112014000220T5; JP2015063900A; CN104718381A; US20160258444A1

Abstract

A flow-regulating plate for reducing the flow rate of cooling water on the outer peripheral side of a volute chamber is disposed downstream of the end part of a tongue section that separates the downstream side and upstream side of the volute chamber that is connected at the downstream side thereof to a discharge port.

Description

Water pump

The present invention relates to a water pump.

As this type of technology, the technology described in Patent Document 1 below is disclosed. Patent Document 1 discloses a pump having a partition wall that partitions a curved channel communicating with a discharge pipe into a first channel and a second channel.

JP 2001-336499 A

In the technique described in Patent Document 1, since the partition wall is provided over half or more of the curved flow path, there is a possibility that the loss of flow velocity is large and the efficiency is deteriorated.
The present invention has been focused on the above problems, and its object is to provide a water pump capable of increasing efficiency.

In order to achieve the above object, in the present invention, the flow rate of the cooling water on the outer peripheral side of the volute chamber is set downstream of the end portion of the tongue that separates the downstream side and the upstream side of the volute chamber connected to the discharge port on the downstream side. A rectifying plate for lowering was provided.

Therefore, in the present invention, the pump efficiency can be increased.

1 is a perspective view of an electric water pump according to Embodiment 1. FIG. FIG. 3 is a view showing a state where a pump cover of the electric water pump according to the first embodiment is removed. It is a figure which shows the flow of the cooling water in a volute room when a baffle plate is not provided. FIG. 3 is a diagram showing the flow of cooling water in the volute chamber when the current plate of Example 1 is provided. FIG. 6 is a view showing a state where a pump cover of the electric water pump according to the second embodiment is removed.

Example 1
The electric water pump 1 of the first embodiment is a cooling pump that uses a cooling medium (cooling water) as a working fluid and is incorporated in a circulation circuit connected to a heat exchanger (radiator). Engine), a driving motor, an inverter, and the like.
FIG. 1 is a perspective view of the electric water pump 1. The electric water pump 1 is accommodated in the pump housing 2. The pump housing 2 includes a pump body 21 and a pump cover 22. The pump cover 22 is formed with a suction port 23 and a discharge port 24. An impeller 3 having a plurality of wings 30 rotates inside the electric water pump 1, and by rotating the impeller 3, cooling water is sucked from the suction port 23 and cooled from the discharge port 24. Discharge water.
FIG. 2 is a view of the electric water pump 1 with the pump cover 22 removed. The impeller 3 is accommodated in a space (impeller accommodating portion 26) formed inside by the pump body 21 and the pump cover 22. The impeller 3 is rotatably provided on a rotary shaft 25 fixed to the pump body 21. A volute chamber 27 having a spiral groove is provided on the outer periphery of the impeller accommodating portion 26. The volute chamber 27 is formed in a spiral shape in the same direction as the rotation direction of the impeller 3 (clockwise in FIG. 2) starting from the point A in FIG. Hereinafter, the opposite side of the impeller 3 in the rotation direction of the volute chamber 27 is referred to as the upstream side, and the rotation direction side is referred to as the downstream side. The discharge port connecting portion 27a at the most downstream portion of the volute chamber 27 is connected to the discharge port 24 of the pump cover. Further, the side surface of the discharge port connecting portion 27a is formed in an arc shape. The pump body 21 is formed with a tongue portion 21a that separates the upstream side and the downstream side of the volute chamber 27 from each other.
A rectifying plate 28 is formed in the volute chamber 27. The rectifying plate 28 is provided so as to divide a part of the volute chamber 27 into two flow paths. The height of the current plate 28 is formed to be the same as the height direction of the volute chamber 27. The rectifying plate 28 is provided on the downstream side of the volute chamber 27, and the upstream end portion 28a is provided on the downstream side of the end portion of the tongue portion 21a. The downstream end portion 28b of the rectifying plate 28 extends to the discharge port connecting portion 27a, but does not contact the side surface of the discharge port connecting portion 27a. The upstream end portion 28a of the rectifying plate 28 is located on the outer peripheral side of the intermediate point in the width direction of the volute chamber 27 (the point on the line B), and the downstream end portion 28b is the intermediate point in the width direction of the volute chamber 27 ( It is formed so as to be located on the inner peripheral side with respect to the point on the line B).

[Action]
FIG. 3 is a diagram showing the flow of cooling water in the volute chamber 27 when the rectifying plate 28 is not provided. The cooling water sucked from the suction port 23 by the rotation of the impeller 3 is sent to the volute chamber 27 by centrifugal force and flows in the same direction as the rotation direction of the impeller 3. At this time, the flow rate on the outer peripheral side of the volute chamber 27 is faster than the flow rate on the inner peripheral side. Therefore, in the discharge port connecting portion 27a of the volute chamber 27, a swirl flow swirling from the outer peripheral side toward the inner peripheral side, and the cooling water flows along the wall surface of the discharge port 24 and the pipe connected to the discharge port 24. It will be. Therefore, friction loss occurs with the wall surface, and the temperature of the cooling water increases due to friction, resulting in a decrease in cooling efficiency.
Therefore, in the first embodiment, the rectifying plate 28 is provided in the volute chamber 27, and the flow rate of the cooling water on the outer peripheral side of the volute chamber 27 is reduced. FIG. 4 is a diagram illustrating the flow of cooling water in the volute chamber 27 when the rectifying plate 28 of the first embodiment is provided. In the rectifying plate 28 of the first embodiment, the upstream end 28a is positioned on the outer peripheral side of the intermediate point in the width direction of the volute chamber 27, and the downstream end 28b is on the inner peripheral side of the intermediate point in the width direction of the volute chamber 27. Is located. That is, the flow on the outer peripheral side of the volute chamber 27 enters from the narrow inlet and exits from the wide outlet, and the flow velocity decreases. On the other hand, the flow on the outer peripheral side of the volute chamber 27 enters from a wide inlet and exits from a narrow outlet, and the flow velocity increases. Therefore, in the discharge port coupling portion 27a of the volute chamber 27, the flow on the outer peripheral side and the flow on the inner peripheral side of the cooling water cancel each other, and the generation of the swirling flow can be suppressed. As a result, the friction loss generated between the discharge port 24 and the wall surface of the pipe connected to the discharge port 24 can be reduced, and the temperature rise of the cooling water can be suppressed, so that the pump efficiency can be improved. .
Further, the current plate 28 is provided on the downstream side of the end portion of the tongue portion 21a of the volute chamber 27. Thereby, the length of the rectifying plate 28 can be shortened, the flow path resistance can be reduced, and the pump efficiency can be improved.

[effect]
(1) The pump housing 2 in which the suction port 23 and the discharge port 24 are formed and the impeller accommodating portion 26 of the pump housing 2 are rotatably disposed, and the cooling water is sucked from the suction port 23 and discharged from the discharge port 24. The impeller 3, the volute chamber 27 formed in a spiral shape on the outer peripheral portion of the impeller accommodating portion 26, the downstream side connecting to the discharge port 24, the tongue 21a separating the downstream side and the upstream side of the volute chamber 27, and the volute chamber And a rectifying plate 28 provided on the downstream side of the end portion of the tongue portion 21a of the 27 and reducing the flow rate of the cooling water on the outer peripheral side of the volute chamber 27.
Therefore, in the discharge port coupling portion 27a of the volute chamber 27, the flow on the outer peripheral side and the flow on the inner peripheral side of the cooling water cancel each other, and the generation of the swirling flow can be suppressed.
(2) The upstream end 28a of the rectifying plate 28 is positioned on the outer peripheral side of the intermediate point in the width direction of the volute chamber 27, the downstream end of the rectifying plate 28 is 28b, and the intermediate in the width direction of the volute chamber 27. It was located on the inner circumference side of the point.
Therefore, the flow velocity on the outer peripheral side of the volute chamber 27 can be reduced by the rectifying plate 28, and at the discharge port connecting portion 27a of the volute chamber 27, the flow on the outer peripheral side and the flow on the inner peripheral side cancel each other. Generation of swirling flow can be suppressed.

(Example 2)
An electric water pump 1 according to a second embodiment will be described. About the same structure as Example 1, the same code | symbol is attached | subjected and description is abbreviate | omitted. FIG. 5 is a view of the electric water pump 1 with the pump cover 22 removed.
A rectifying plate 28 extending from the side surface of the discharge port connecting portion 27a into the volute chamber 27 was provided. Thereby, the flow which goes to the inner peripheral side from the outer peripheral side can be inhibited in the discharge port connection part 27a, and generation | occurrence | production of a swirling flow can be suppressed.
[effect]
(3) The rectifying plate 28 is formed so as to extend into the volute chamber 27 from the side surface of the discharge port connecting portion 27a of the volute chamber 27.
Therefore, it is possible to inhibit the flow from the outer peripheral side to the inner peripheral side in the discharge port connecting portion 27a, and it is possible to suppress the generation of the swirling flow.

[Other Examples]
As described above, the present invention has been described based on the first embodiment and the second embodiment. However, the specific configuration of each invention is not limited to the first and second embodiments and does not depart from the gist of the present invention. Such design changes are included in the present invention.

1 Electric water pump
3 Impeller
21a Tongue
23 Inlet
24 Discharge port
26 Impeller housing
27 Volute room
28 Rectifier plate

Claims

A pump housing having a suction port and a discharge port;
An impeller that is rotatably arranged in an impeller accommodating portion of the pump housing, sucks cooling water from the suction port, and discharges the cooling water from the discharge port;
A volute chamber formed in a spiral shape on the outer periphery of the impeller accommodating portion, and a downstream side connected to the discharge port;
A tongue that separates the downstream side and the upstream side of the volute chamber;
A rectifying plate that is provided on the downstream side of the end of the tongue of the volute chamber and reduces the flow rate of cooling water on the outer peripheral side of the volute chamber;
A water pump comprising:
In the water pump according to claim 1,
The upstream end of the current plate is located on the outer peripheral side of the intermediate point in the width direction of the volute chamber, and the downstream end of the current plate is on the inner periphery of the intermediate point in the width direction of the volute chamber. Water pump characterized by being located on the side.
In the water pump according to claim 1,
The water pump is characterized in that the current plate is formed so as to extend from the side surface of the most downstream portion of the volute chamber into the volute chamber.