Water Pump
A flow guide plate is disposed downstream from an end portion of a tongue part in a volute chamber, and configured to reduce flow velocity of cooling water flowing at an outer peripheral side of the volute chamber, wherein the volute chamber includes a downstream side leading to a discharge opening, and wherein the tongue part separates the downstream side and an upstream side of the volute chamber from each other.
The present invention relates to a water pump.
BACKGROUND ARTA patent document 1 discloses an art of this kind. Patent document 1 discloses a pump including a separation wall, wherein the separation wall separates a curved flow path into a first flow path and a second flow path, and wherein the curved flow path communicates with a discharge pipe,
PRIOR ART DOCUMENT(S) Patent Document(s)Patent Document 1: Japanese Patent Application Publication No, 2001-336499
SUMMARY OF THE INVENTION Problem(s) to be Solved by the InventionAccording to the art described in patent document 1, the separation wall is disposed to extend beyond half of the curved flow path, This may adversely affect the efficiency due to a large loss in flow velocity. The present invention is made with attention to this problem, It is an object of the present invention to provide a water pump whose efficiency can be enhanced.
Means to Solve the Problem(s)According to the present invention, in order to accomplish the object described above, a flow guide plate is disposed downstream from an end portion of a tongue part in a volute chamber, and configured to reduce flow velocity of cooling water flowing at an outer peripheral side of the volute chamber, wherein the volute chamber includes a downstream side leading to a discharge opening, and wherein the tongue part separates the downstream side and an upstream side of the volute chamber from each other.
Effect(s) of the InventionThereby, the present invention can enhance the pumping efficiency.
An electric water pump 1 according to a first embodiment is a cooling pump that employs a cooling medium (cooling water) as a working fluid, and is installed in a circulating circuit connected to a heat exchanger (radiator). For example, electric water pump 1 is a water pump for supplying cooling water to an engine (internal combustion engine), a driving motor, an inverter, etc., in a hybrid electric vehicle.
<1> It includes: a pump housing (2) formed with a suction opening (23) and a discharge opening (24); an impeller (3) arranged rotatably in an impeller accommodation part (26) of the pump housing (2), and configured to suck cooling water through the suction opening (23) and discharge the cooling water through the discharge opening (24); a volute chamber (27) formed in a volute shape at an outer periphery of the impeller accommodation part (26), and including a downstream side leading to the discharge opening (24); a tongue part (21a) separating the downstream side and an upstream side of the volute chamber (27) from each other; and a flow guide plate (28) disposed downstream from an end portion of the tongue part (21a) in the volute chamber (27), and configured to reduce flow velocity of cooling water flowing at an outer peripheral side of the volute chamber (27). Accordingly, at the discharge-opening-connecting portion 27a of volute chamber 27, the flow of cooling water at the outer peripheral side and the flow of cooling water at the inner peripheral side cancel each other, to prevent the occurrence of a swirl flow.
<2> The flow guide plate (28) includes an upstream end (28a) located closer to an outer periphery of the volute chamber (27) with respect to a midpoint of the volute chamber (27) in a transverse direction of the volute chamber (27); and the flow guide plate (28) includes a downstream end (28b) located closer to an inner periphery of the volute chamber (27) with respect to the midpoint of the volute chamber (27) in the transverse direction of the volute chamber (27). Accordingly, flow guide plate 28 serves to reduce the flow velocity at the outer peripheral side of volute chamber 27, so that at the discharge-opening-connecting portion 27a of volute chamber 27, the flow of cooling water at the outer peripheral side and the flow of cooling water at the inner peripheral side cancel each other, to prevent the occurrence of a swirl flow.
Second EmbodimentThe following describes an electric water pump 1 according to a second embodiment. With regard to the same configuration as in the first embodiment, the same symbols are given and description thereof is omitted.
<3> The flow guide plate 28 is formed to extend from the lateral surface of discharge-opening-connecting portion 27a of the volute chamber 27 into the volute chamber 27. This serves to obstruct the flow from the outer peripheral side to the inner peripheral side at discharge-opening-connecting portion 27a, and thereby prevent the occurrence of a swirl flow.
Other EmbodimentsAlthough the present invention has been described above by reference to the first embodiment and the second embodiment, specific configuration of the present invention is not limited to these embodiments, The present invention includes modifications in design if such modifications are within the subject matter of the invention.
Description of Symbols1 . . . Electric Water Pump
3 . . . impeller
21a . . . Tongue Part
23 . . . Suction Opening
24 . . . Discharge Opening
26 . . . Impeller Accommodation Part
27 . . . Volute Chamber
28 . . . Flow Guide Plate
Claims
1. A water pump comprising:
- a pump housing formed with a suction opening and a discharge opening;
- an impeller arranged rotatably in an impeller accommodation part of the pump housing, and configured to suck cooling water through the suction opening and discharge the cooling water through the discharge opening;
- a volute chamber formed in a volute shape at an outer periphery of the impeller accommodation part, and including a downstream side leading to the discharge opening;
- a tongue part separating the downstream side and an upstream side of the volute chamber from each other; and
- a flow guide plate disposed downstream from an end portion of the tongue part in the volute chamber, and configured to reduce flow velocity of cooling water flowing at an outer peripheral side of the volute chamber.
2. The water pump as claimed in claim 1, wherein:
- the flow guide plate includes an upstream end located closer to an outer periphery of the volute chamber with respect to a midpoint of the volute chamber in a transverse direction of the volute chamber; and
- the flow guide plate includes a downstream end located closer to an inner periphery of the volute chamber with respect to the midpoint of the volute chamber in the transverse direction of the volute chamber.
3. The water pump as claimed in claim 1, wherein the flow guide plate is formed to extend from a lateral surface of a downstream end portion of the volute chamber into the volute chamber.
Type: Application
Filed: Jul 14, 2014
Publication Date: Sep 8, 2016
Inventor: Kenya TAKARAI (Honjo-shi, Saitama)
Application Number: 14/430,349